diff options
Diffstat (limited to 'Documentation/DocBook')
223 files changed, 64862 insertions, 1969 deletions
diff --git a/Documentation/DocBook/.gitignore b/Documentation/DocBook/.gitignore index c6def352fe3..7ebd5465d92 100644 --- a/Documentation/DocBook/.gitignore +++ b/Documentation/DocBook/.gitignore @@ -8,3 +8,8 @@ *.dvi *.log *.out +*.png +*.gif +*.svg +media-indices.tmpl +media-entities.tmpl diff --git a/Documentation/DocBook/80211.tmpl b/Documentation/DocBook/80211.tmpl new file mode 100644 index 00000000000..d9b9416c989 --- /dev/null +++ b/Documentation/DocBook/80211.tmpl @@ -0,0 +1,583 @@ +<?xml version="1.0" encoding="UTF-8"?> +<!DOCTYPE set PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN" + "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" []> +<set> + <setinfo> + <title>The 802.11 subsystems – for kernel developers</title> + <subtitle> + Explaining wireless 802.11 networking in the Linux kernel + </subtitle> + + <copyright> + <year>2007-2009</year> + <holder>Johannes Berg</holder> + </copyright> + + <authorgroup> + <author> + <firstname>Johannes</firstname> + <surname>Berg</surname> + <affiliation> + <address><email>johannes@sipsolutions.net</email></address> + </affiliation> + </author> + </authorgroup> + + <legalnotice> + <para> + This documentation is free software; you can redistribute + it and/or modify it under the terms of the GNU General Public + License version 2 as published by the Free Software Foundation. + </para> + <para> + This documentation is distributed in the hope that it will be + useful, but WITHOUT ANY WARRANTY; without even the implied + warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + See the GNU General Public License for more details. + </para> + <para> + You should have received a copy of the GNU General Public + License along with this documentation; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, + MA 02111-1307 USA + </para> + <para> + For more details see the file COPYING in the source + distribution of Linux. + </para> + </legalnotice> + + <abstract> + <para> + These books attempt to give a description of the + various subsystems that play a role in 802.11 wireless + networking in Linux. Since these books are for kernel + developers they attempts to document the structures + and functions used in the kernel as well as giving a + higher-level overview. + </para> + <para> + The reader is expected to be familiar with the 802.11 + standard as published by the IEEE in 802.11-2007 (or + possibly later versions). References to this standard + will be given as "802.11-2007 8.1.5". + </para> + </abstract> + </setinfo> + <book id="cfg80211-developers-guide"> + <bookinfo> + <title>The cfg80211 subsystem</title> + + <abstract> +!Pinclude/net/cfg80211.h Introduction + </abstract> + </bookinfo> + <chapter> + <title>Device registration</title> +!Pinclude/net/cfg80211.h Device registration +!Finclude/net/cfg80211.h ieee80211_band +!Finclude/net/cfg80211.h ieee80211_channel_flags +!Finclude/net/cfg80211.h ieee80211_channel +!Finclude/net/cfg80211.h ieee80211_rate_flags +!Finclude/net/cfg80211.h ieee80211_rate +!Finclude/net/cfg80211.h ieee80211_sta_ht_cap +!Finclude/net/cfg80211.h ieee80211_supported_band +!Finclude/net/cfg80211.h cfg80211_signal_type +!Finclude/net/cfg80211.h wiphy_params_flags +!Finclude/net/cfg80211.h wiphy_flags +!Finclude/net/cfg80211.h wiphy +!Finclude/net/cfg80211.h wireless_dev +!Finclude/net/cfg80211.h wiphy_new +!Finclude/net/cfg80211.h wiphy_register +!Finclude/net/cfg80211.h wiphy_unregister +!Finclude/net/cfg80211.h wiphy_free + +!Finclude/net/cfg80211.h wiphy_name +!Finclude/net/cfg80211.h wiphy_dev +!Finclude/net/cfg80211.h wiphy_priv +!Finclude/net/cfg80211.h priv_to_wiphy +!Finclude/net/cfg80211.h set_wiphy_dev +!Finclude/net/cfg80211.h wdev_priv +!Finclude/net/cfg80211.h ieee80211_iface_limit +!Finclude/net/cfg80211.h ieee80211_iface_combination +!Finclude/net/cfg80211.h cfg80211_check_combinations + </chapter> + <chapter> + <title>Actions and configuration</title> +!Pinclude/net/cfg80211.h Actions and configuration +!Finclude/net/cfg80211.h cfg80211_ops +!Finclude/net/cfg80211.h vif_params +!Finclude/net/cfg80211.h key_params +!Finclude/net/cfg80211.h survey_info_flags +!Finclude/net/cfg80211.h survey_info +!Finclude/net/cfg80211.h cfg80211_beacon_data +!Finclude/net/cfg80211.h cfg80211_ap_settings +!Finclude/net/cfg80211.h station_parameters +!Finclude/net/cfg80211.h station_info_flags +!Finclude/net/cfg80211.h rate_info_flags +!Finclude/net/cfg80211.h rate_info +!Finclude/net/cfg80211.h station_info +!Finclude/net/cfg80211.h monitor_flags +!Finclude/net/cfg80211.h mpath_info_flags +!Finclude/net/cfg80211.h mpath_info +!Finclude/net/cfg80211.h bss_parameters +!Finclude/net/cfg80211.h ieee80211_txq_params +!Finclude/net/cfg80211.h cfg80211_crypto_settings +!Finclude/net/cfg80211.h cfg80211_auth_request +!Finclude/net/cfg80211.h cfg80211_assoc_request +!Finclude/net/cfg80211.h cfg80211_deauth_request +!Finclude/net/cfg80211.h cfg80211_disassoc_request +!Finclude/net/cfg80211.h cfg80211_ibss_params +!Finclude/net/cfg80211.h cfg80211_connect_params +!Finclude/net/cfg80211.h cfg80211_pmksa +!Finclude/net/cfg80211.h cfg80211_rx_mlme_mgmt +!Finclude/net/cfg80211.h cfg80211_auth_timeout +!Finclude/net/cfg80211.h cfg80211_rx_assoc_resp +!Finclude/net/cfg80211.h cfg80211_assoc_timeout +!Finclude/net/cfg80211.h cfg80211_tx_mlme_mgmt +!Finclude/net/cfg80211.h cfg80211_ibss_joined +!Finclude/net/cfg80211.h cfg80211_connect_result +!Finclude/net/cfg80211.h cfg80211_roamed +!Finclude/net/cfg80211.h cfg80211_disconnected +!Finclude/net/cfg80211.h cfg80211_ready_on_channel +!Finclude/net/cfg80211.h cfg80211_remain_on_channel_expired +!Finclude/net/cfg80211.h cfg80211_new_sta +!Finclude/net/cfg80211.h cfg80211_rx_mgmt +!Finclude/net/cfg80211.h cfg80211_mgmt_tx_status +!Finclude/net/cfg80211.h cfg80211_cqm_rssi_notify +!Finclude/net/cfg80211.h cfg80211_cqm_pktloss_notify +!Finclude/net/cfg80211.h cfg80211_michael_mic_failure + </chapter> + <chapter> + <title>Scanning and BSS list handling</title> +!Pinclude/net/cfg80211.h Scanning and BSS list handling +!Finclude/net/cfg80211.h cfg80211_ssid +!Finclude/net/cfg80211.h cfg80211_scan_request +!Finclude/net/cfg80211.h cfg80211_scan_done +!Finclude/net/cfg80211.h cfg80211_bss +!Finclude/net/cfg80211.h cfg80211_inform_bss_width_frame +!Finclude/net/cfg80211.h cfg80211_inform_bss_width +!Finclude/net/cfg80211.h cfg80211_unlink_bss +!Finclude/net/cfg80211.h cfg80211_find_ie +!Finclude/net/cfg80211.h ieee80211_bss_get_ie + </chapter> + <chapter> + <title>Utility functions</title> +!Pinclude/net/cfg80211.h Utility functions +!Finclude/net/cfg80211.h ieee80211_channel_to_frequency +!Finclude/net/cfg80211.h ieee80211_frequency_to_channel +!Finclude/net/cfg80211.h ieee80211_get_channel +!Finclude/net/cfg80211.h ieee80211_get_response_rate +!Finclude/net/cfg80211.h ieee80211_hdrlen +!Finclude/net/cfg80211.h ieee80211_get_hdrlen_from_skb +!Finclude/net/cfg80211.h ieee80211_radiotap_iterator + </chapter> + <chapter> + <title>Data path helpers</title> +!Pinclude/net/cfg80211.h Data path helpers +!Finclude/net/cfg80211.h ieee80211_data_to_8023 +!Finclude/net/cfg80211.h ieee80211_data_from_8023 +!Finclude/net/cfg80211.h ieee80211_amsdu_to_8023s +!Finclude/net/cfg80211.h cfg80211_classify8021d + </chapter> + <chapter> + <title>Regulatory enforcement infrastructure</title> +!Pinclude/net/cfg80211.h Regulatory enforcement infrastructure +!Finclude/net/cfg80211.h regulatory_hint +!Finclude/net/cfg80211.h wiphy_apply_custom_regulatory +!Finclude/net/cfg80211.h freq_reg_info + </chapter> + <chapter> + <title>RFkill integration</title> +!Pinclude/net/cfg80211.h RFkill integration +!Finclude/net/cfg80211.h wiphy_rfkill_set_hw_state +!Finclude/net/cfg80211.h wiphy_rfkill_start_polling +!Finclude/net/cfg80211.h wiphy_rfkill_stop_polling + </chapter> + <chapter> + <title>Test mode</title> +!Pinclude/net/cfg80211.h Test mode +!Finclude/net/cfg80211.h cfg80211_testmode_alloc_reply_skb +!Finclude/net/cfg80211.h cfg80211_testmode_reply +!Finclude/net/cfg80211.h cfg80211_testmode_alloc_event_skb +!Finclude/net/cfg80211.h cfg80211_testmode_event + </chapter> + </book> + <book id="mac80211-developers-guide"> + <bookinfo> + <title>The mac80211 subsystem</title> + <abstract> +!Pinclude/net/mac80211.h Introduction +!Pinclude/net/mac80211.h Warning + </abstract> + </bookinfo> + + <toc></toc> + + <!-- + Generally, this document shall be ordered by increasing complexity. + It is important to note that readers should be able to read only + the first few sections to get a working driver and only advanced + usage should require reading the full document. + --> + + <part> + <title>The basic mac80211 driver interface</title> + <partintro> + <para> + You should read and understand the information contained + within this part of the book while implementing a driver. + In some chapters, advanced usage is noted, that may be + skipped at first. + </para> + <para> + This part of the book only covers station and monitor mode + functionality, additional information required to implement + the other modes is covered in the second part of the book. + </para> + </partintro> + + <chapter id="basics"> + <title>Basic hardware handling</title> + <para>TBD</para> + <para> + This chapter shall contain information on getting a hw + struct allocated and registered with mac80211. + </para> + <para> + Since it is required to allocate rates/modes before registering + a hw struct, this chapter shall also contain information on setting + up the rate/mode structs. + </para> + <para> + Additionally, some discussion about the callbacks and + the general programming model should be in here, including + the definition of ieee80211_ops which will be referred to + a lot. + </para> + <para> + Finally, a discussion of hardware capabilities should be done + with references to other parts of the book. + </para> + <!-- intentionally multiple !F lines to get proper order --> +!Finclude/net/mac80211.h ieee80211_hw +!Finclude/net/mac80211.h ieee80211_hw_flags +!Finclude/net/mac80211.h SET_IEEE80211_DEV +!Finclude/net/mac80211.h SET_IEEE80211_PERM_ADDR +!Finclude/net/mac80211.h ieee80211_ops +!Finclude/net/mac80211.h ieee80211_alloc_hw +!Finclude/net/mac80211.h ieee80211_register_hw +!Finclude/net/mac80211.h ieee80211_unregister_hw +!Finclude/net/mac80211.h ieee80211_free_hw + </chapter> + + <chapter id="phy-handling"> + <title>PHY configuration</title> + <para>TBD</para> + <para> + This chapter should describe PHY handling including + start/stop callbacks and the various structures used. + </para> +!Finclude/net/mac80211.h ieee80211_conf +!Finclude/net/mac80211.h ieee80211_conf_flags + </chapter> + + <chapter id="iface-handling"> + <title>Virtual interfaces</title> + <para>TBD</para> + <para> + This chapter should describe virtual interface basics + that are relevant to the driver (VLANs, MGMT etc are not.) + It should explain the use of the add_iface/remove_iface + callbacks as well as the interface configuration callbacks. + </para> + <para>Things related to AP mode should be discussed there.</para> + <para> + Things related to supporting multiple interfaces should be + in the appropriate chapter, a BIG FAT note should be here about + this though and the recommendation to allow only a single + interface in STA mode at first! + </para> +!Finclude/net/mac80211.h ieee80211_vif + </chapter> + + <chapter id="rx-tx"> + <title>Receive and transmit processing</title> + <sect1> + <title>what should be here</title> + <para>TBD</para> + <para> + This should describe the receive and transmit + paths in mac80211/the drivers as well as + transmit status handling. + </para> + </sect1> + <sect1> + <title>Frame format</title> +!Pinclude/net/mac80211.h Frame format + </sect1> + <sect1> + <title>Packet alignment</title> +!Pnet/mac80211/rx.c Packet alignment + </sect1> + <sect1> + <title>Calling into mac80211 from interrupts</title> +!Pinclude/net/mac80211.h Calling mac80211 from interrupts + </sect1> + <sect1> + <title>functions/definitions</title> +!Finclude/net/mac80211.h ieee80211_rx_status +!Finclude/net/mac80211.h mac80211_rx_flags +!Finclude/net/mac80211.h mac80211_tx_info_flags +!Finclude/net/mac80211.h mac80211_tx_control_flags +!Finclude/net/mac80211.h mac80211_rate_control_flags +!Finclude/net/mac80211.h ieee80211_tx_rate +!Finclude/net/mac80211.h ieee80211_tx_info +!Finclude/net/mac80211.h ieee80211_tx_info_clear_status +!Finclude/net/mac80211.h ieee80211_rx +!Finclude/net/mac80211.h ieee80211_rx_ni +!Finclude/net/mac80211.h ieee80211_rx_irqsafe +!Finclude/net/mac80211.h ieee80211_tx_status +!Finclude/net/mac80211.h ieee80211_tx_status_ni +!Finclude/net/mac80211.h ieee80211_tx_status_irqsafe +!Finclude/net/mac80211.h ieee80211_rts_get +!Finclude/net/mac80211.h ieee80211_rts_duration +!Finclude/net/mac80211.h ieee80211_ctstoself_get +!Finclude/net/mac80211.h ieee80211_ctstoself_duration +!Finclude/net/mac80211.h ieee80211_generic_frame_duration +!Finclude/net/mac80211.h ieee80211_wake_queue +!Finclude/net/mac80211.h ieee80211_stop_queue +!Finclude/net/mac80211.h ieee80211_wake_queues +!Finclude/net/mac80211.h ieee80211_stop_queues +!Finclude/net/mac80211.h ieee80211_queue_stopped + </sect1> + </chapter> + + <chapter id="filters"> + <title>Frame filtering</title> +!Pinclude/net/mac80211.h Frame filtering +!Finclude/net/mac80211.h ieee80211_filter_flags + </chapter> + + <chapter id="workqueue"> + <title>The mac80211 workqueue</title> +!Pinclude/net/mac80211.h mac80211 workqueue +!Finclude/net/mac80211.h ieee80211_queue_work +!Finclude/net/mac80211.h ieee80211_queue_delayed_work + </chapter> + </part> + + <part id="advanced"> + <title>Advanced driver interface</title> + <partintro> + <para> + Information contained within this part of the book is + of interest only for advanced interaction of mac80211 + with drivers to exploit more hardware capabilities and + improve performance. + </para> + </partintro> + + <chapter id="led-support"> + <title>LED support</title> + <para> + Mac80211 supports various ways of blinking LEDs. Wherever possible, + device LEDs should be exposed as LED class devices and hooked up to + the appropriate trigger, which will then be triggered appropriately + by mac80211. + </para> +!Finclude/net/mac80211.h ieee80211_get_tx_led_name +!Finclude/net/mac80211.h ieee80211_get_rx_led_name +!Finclude/net/mac80211.h ieee80211_get_assoc_led_name +!Finclude/net/mac80211.h ieee80211_get_radio_led_name +!Finclude/net/mac80211.h ieee80211_tpt_blink +!Finclude/net/mac80211.h ieee80211_tpt_led_trigger_flags +!Finclude/net/mac80211.h ieee80211_create_tpt_led_trigger + </chapter> + + <chapter id="hardware-crypto-offload"> + <title>Hardware crypto acceleration</title> +!Pinclude/net/mac80211.h Hardware crypto acceleration + <!-- intentionally multiple !F lines to get proper order --> +!Finclude/net/mac80211.h set_key_cmd +!Finclude/net/mac80211.h ieee80211_key_conf +!Finclude/net/mac80211.h ieee80211_key_flags +!Finclude/net/mac80211.h ieee80211_get_tkip_p1k +!Finclude/net/mac80211.h ieee80211_get_tkip_p1k_iv +!Finclude/net/mac80211.h ieee80211_get_tkip_p2k + </chapter> + + <chapter id="powersave"> + <title>Powersave support</title> +!Pinclude/net/mac80211.h Powersave support + </chapter> + + <chapter id="beacon-filter"> + <title>Beacon filter support</title> +!Pinclude/net/mac80211.h Beacon filter support +!Finclude/net/mac80211.h ieee80211_beacon_loss + </chapter> + + <chapter id="qos"> + <title>Multiple queues and QoS support</title> + <para>TBD</para> +!Finclude/net/mac80211.h ieee80211_tx_queue_params + </chapter> + + <chapter id="AP"> + <title>Access point mode support</title> + <para>TBD</para> + <para>Some parts of the if_conf should be discussed here instead</para> + <para> + Insert notes about VLAN interfaces with hw crypto here or + in the hw crypto chapter. + </para> + <section id="ps-client"> + <title>support for powersaving clients</title> +!Pinclude/net/mac80211.h AP support for powersaving clients + </section> +!Finclude/net/mac80211.h ieee80211_get_buffered_bc +!Finclude/net/mac80211.h ieee80211_beacon_get +!Finclude/net/mac80211.h ieee80211_sta_eosp +!Finclude/net/mac80211.h ieee80211_frame_release_type +!Finclude/net/mac80211.h ieee80211_sta_ps_transition +!Finclude/net/mac80211.h ieee80211_sta_ps_transition_ni +!Finclude/net/mac80211.h ieee80211_sta_set_buffered +!Finclude/net/mac80211.h ieee80211_sta_block_awake + </chapter> + + <chapter id="multi-iface"> + <title>Supporting multiple virtual interfaces</title> + <para>TBD</para> + <para> + Note: WDS with identical MAC address should almost always be OK + </para> + <para> + Insert notes about having multiple virtual interfaces with + different MAC addresses here, note which configurations are + supported by mac80211, add notes about supporting hw crypto + with it. + </para> +!Finclude/net/mac80211.h ieee80211_iterate_active_interfaces +!Finclude/net/mac80211.h ieee80211_iterate_active_interfaces_atomic + </chapter> + + <chapter id="station-handling"> + <title>Station handling</title> + <para>TODO</para> +!Finclude/net/mac80211.h ieee80211_sta +!Finclude/net/mac80211.h sta_notify_cmd +!Finclude/net/mac80211.h ieee80211_find_sta +!Finclude/net/mac80211.h ieee80211_find_sta_by_ifaddr + </chapter> + + <chapter id="hardware-scan-offload"> + <title>Hardware scan offload</title> + <para>TBD</para> +!Finclude/net/mac80211.h ieee80211_scan_completed + </chapter> + + <chapter id="aggregation"> + <title>Aggregation</title> + <sect1> + <title>TX A-MPDU aggregation</title> +!Pnet/mac80211/agg-tx.c TX A-MPDU aggregation +!Cnet/mac80211/agg-tx.c + </sect1> + <sect1> + <title>RX A-MPDU aggregation</title> +!Pnet/mac80211/agg-rx.c RX A-MPDU aggregation +!Cnet/mac80211/agg-rx.c + </sect1> +!Finclude/net/mac80211.h ieee80211_ampdu_mlme_action + </chapter> + + <chapter id="smps"> + <title>Spatial Multiplexing Powersave (SMPS)</title> +!Pinclude/net/mac80211.h Spatial multiplexing power save +!Finclude/net/mac80211.h ieee80211_request_smps +!Finclude/net/mac80211.h ieee80211_smps_mode + </chapter> + </part> + + <part id="rate-control"> + <title>Rate control interface</title> + <partintro> + <para>TBD</para> + <para> + This part of the book describes the rate control algorithm + interface and how it relates to mac80211 and drivers. + </para> + </partintro> + <chapter id="ratecontrol-api"> + <title>Rate Control API</title> + <para>TBD</para> +!Finclude/net/mac80211.h ieee80211_start_tx_ba_session +!Finclude/net/mac80211.h ieee80211_start_tx_ba_cb_irqsafe +!Finclude/net/mac80211.h ieee80211_stop_tx_ba_session +!Finclude/net/mac80211.h ieee80211_stop_tx_ba_cb_irqsafe +!Finclude/net/mac80211.h ieee80211_rate_control_changed +!Finclude/net/mac80211.h ieee80211_tx_rate_control +!Finclude/net/mac80211.h rate_control_send_low + </chapter> + </part> + + <part id="internal"> + <title>Internals</title> + <partintro> + <para>TBD</para> + <para> + This part of the book describes mac80211 internals. + </para> + </partintro> + + <chapter id="key-handling"> + <title>Key handling</title> + <sect1> + <title>Key handling basics</title> +!Pnet/mac80211/key.c Key handling basics + </sect1> + <sect1> + <title>MORE TBD</title> + <para>TBD</para> + </sect1> + </chapter> + + <chapter id="rx-processing"> + <title>Receive processing</title> + <para>TBD</para> + </chapter> + + <chapter id="tx-processing"> + <title>Transmit processing</title> + <para>TBD</para> + </chapter> + + <chapter id="sta-info"> + <title>Station info handling</title> + <sect1> + <title>Programming information</title> +!Fnet/mac80211/sta_info.h sta_info +!Fnet/mac80211/sta_info.h ieee80211_sta_info_flags + </sect1> + <sect1> + <title>STA information lifetime rules</title> +!Pnet/mac80211/sta_info.c STA information lifetime rules + </sect1> + </chapter> + + <chapter id="aggregation-internals"> + <title>Aggregation</title> +!Fnet/mac80211/sta_info.h sta_ampdu_mlme +!Fnet/mac80211/sta_info.h tid_ampdu_tx +!Fnet/mac80211/sta_info.h tid_ampdu_rx + </chapter> + + <chapter id="synchronisation"> + <title>Synchronisation</title> + <para>TBD</para> + <para>Locking, lots of RCU</para> + </chapter> + </part> + </book> +</set> diff --git a/Documentation/DocBook/Makefile b/Documentation/DocBook/Makefile index 9632444f6c6..bec06659e0e 100644 --- a/Documentation/DocBook/Makefile +++ b/Documentation/DocBook/Makefile @@ -6,15 +6,18 @@ # To add a new book the only step required is to add the book to the # list of DOCBOOKS. -DOCBOOKS := z8530book.xml mcabook.xml device-drivers.xml \ +DOCBOOKS := z8530book.xml device-drivers.xml \ kernel-hacking.xml kernel-locking.xml deviceiobook.xml \ - procfs-guide.xml writing_usb_driver.xml networking.xml \ + writing_usb_driver.xml networking.xml \ kernel-api.xml filesystems.xml lsm.xml usb.xml kgdb.xml \ gadget.xml libata.xml mtdnand.xml librs.xml rapidio.xml \ genericirq.xml s390-drivers.xml uio-howto.xml scsi.xml \ - mac80211.xml debugobjects.xml sh.xml regulator.xml \ + 80211.xml debugobjects.xml sh.xml regulator.xml \ alsa-driver-api.xml writing-an-alsa-driver.xml \ - tracepoint.xml + tracepoint.xml drm.xml media_api.xml w1.xml \ + writing_musb_glue_layer.xml + +include Documentation/DocBook/media/Makefile ### # The build process is as follows (targets): @@ -34,6 +37,7 @@ PS_METHOD = $(prefer-db2x) # The targets that may be used. PHONY += xmldocs sgmldocs psdocs pdfdocs htmldocs mandocs installmandocs cleandocs +targets += $(DOCBOOKS) BOOKS := $(addprefix $(obj)/,$(DOCBOOKS)) xmldocs: $(BOOKS) sgmldocs: xmldocs @@ -47,21 +51,24 @@ pdfdocs: $(PDF) HTML := $(sort $(patsubst %.xml, %.html, $(BOOKS))) htmldocs: $(HTML) $(call build_main_index) + $(call build_images) + $(call install_media_images) MAN := $(patsubst %.xml, %.9, $(BOOKS)) mandocs: $(MAN) + $(if $(wildcard $(obj)/man/*.9),gzip -f $(obj)/man/*.9) installmandocs: mandocs mkdir -p /usr/local/man/man9/ - install Documentation/DocBook/man/*.9.gz /usr/local/man/man9/ + install $(obj)/man/*.9.gz /usr/local/man/man9/ ### #External programs used KERNELDOC = $(srctree)/scripts/kernel-doc -DOCPROC = $(objtree)/scripts/basic/docproc +DOCPROC = $(objtree)/scripts/docproc -XMLTOFLAGS = -m $(srctree)/Documentation/DocBook/stylesheet.xsl -#XMLTOFLAGS += --skip-validation +XMLTOFLAGS = -m $(srctree)/$(src)/stylesheet.xsl +XMLTOFLAGS += --skip-validation ### # DOCPROC is used for two purposes: @@ -82,32 +89,9 @@ define rule_docproc ) > $(dir $@).$(notdir $@).cmd endef -%.xml: %.tmpl FORCE +%.xml: %.tmpl $(KERNELDOC) $(DOCPROC) FORCE $(call if_changed_rule,docproc) -### -#Read in all saved dependency files -cmd_files := $(wildcard $(foreach f,$(BOOKS),$(dir $(f)).$(notdir $(f)).cmd)) - -ifneq ($(cmd_files),) - include $(cmd_files) -endif - -### -# Changes in kernel-doc force a rebuild of all documentation -$(BOOKS): $(KERNELDOC) - -### -# procfs guide uses a .c file as example code. -# This requires an explicit dependency -C-procfs-example = procfs_example.xml -C-procfs-example2 = $(addprefix $(obj)/,$(C-procfs-example)) -$(obj)/procfs-guide.xml: $(C-procfs-example2) - -# List of programs to build -##oops, this is a kernel module::hostprogs-y := procfs_example -obj-m += procfs_example.o - # Tell kbuild to always build the programs always := $(hostprogs-y) @@ -145,16 +129,16 @@ quiet_cmd_db2pdf = PDF $@ index = index.html -main_idx = Documentation/DocBook/$(index) -build_main_index = rm -rf $(main_idx) && \ +main_idx = $(obj)/$(index) +build_main_index = rm -rf $(main_idx); \ echo '<h1>Linux Kernel HTML Documentation</h1>' >> $(main_idx) && \ echo '<h2>Kernel Version: $(KERNELVERSION)</h2>' >> $(main_idx) && \ cat $(HTML) >> $(main_idx) quiet_cmd_db2html = HTML $@ - cmd_db2html = xmlto xhtml $(XMLTOFLAGS) -o $(patsubst %.html,%,$@) $< && \ + cmd_db2html = xmlto html $(XMLTOFLAGS) -o $(patsubst %.html,%,$@) $< && \ echo '<a HREF="$(patsubst %.html,%,$(notdir $@))/index.html"> \ - $(patsubst %.html,%,$(notdir $@))</a><p>' > $@ + $(patsubst %.html,%,$(notdir $@))</a><p>' > $@ %.html: %.xml @(which xmlto > /dev/null 2>&1) || \ @@ -166,7 +150,7 @@ quiet_cmd_db2html = HTML $@ cp $(PNG-$(basename $(notdir $@))) $(patsubst %.html,%,$@); fi quiet_cmd_db2man = MAN $@ - cmd_db2man = if grep -q refentry $<; then xmlto man $(XMLTOFLAGS) -o $(obj)/man $< ; gzip -f $(obj)/man/*.9; fi + cmd_db2man = if grep -q refentry $<; then xmlto man $(XMLTOFLAGS) -o $(obj)/man $< ; fi %.9 : %.xml @(which xmlto > /dev/null 2>&1) || \ (echo "*** You need to install xmlto ***"; \ @@ -234,11 +218,11 @@ clean-files := $(DOCBOOKS) \ $(patsubst %.xml, %.pdf, $(DOCBOOKS)) \ $(patsubst %.xml, %.html, $(DOCBOOKS)) \ $(patsubst %.xml, %.9, $(DOCBOOKS)) \ - $(C-procfs-example) $(index) + $(index) clean-dirs := $(patsubst %.xml,%,$(DOCBOOKS)) man -cleandocs: +cleandocs: cleanmediadocs $(Q)rm -f $(call objectify, $(clean-files)) $(Q)rm -rf $(call objectify, $(clean-dirs)) diff --git a/Documentation/DocBook/debugobjects.tmpl b/Documentation/DocBook/debugobjects.tmpl index 08ff908aa7a..24979f691e3 100644 --- a/Documentation/DocBook/debugobjects.tmpl +++ b/Documentation/DocBook/debugobjects.tmpl @@ -96,6 +96,7 @@ <listitem><para>debug_object_deactivate</para></listitem> <listitem><para>debug_object_destroy</para></listitem> <listitem><para>debug_object_free</para></listitem> + <listitem><para>debug_object_assert_init</para></listitem> </itemizedlist> Each of these functions takes the address of the real object and a pointer to the object type specific debug description @@ -273,6 +274,26 @@ debug checks. </para> </sect1> + + <sect1 id="debug_object_assert_init"> + <title>debug_object_assert_init</title> + <para> + This function is called to assert that an object has been + initialized. + </para> + <para> + When the real object is not tracked by debugobjects, it calls + fixup_assert_init of the object type description structure + provided by the caller, with the hardcoded object state + ODEBUG_NOT_AVAILABLE. The fixup function can correct the problem + by calling debug_object_init and other specific initializing + functions. + </para> + <para> + When the real object is already tracked by debugobjects it is + ignored. + </para> + </sect1> </chapter> <chapter id="fixupfunctions"> <title>Fixup functions</title> @@ -381,6 +402,35 @@ statistics. </para> </sect1> + <sect1 id="fixup_assert_init"> + <title>fixup_assert_init</title> + <para> + This function is called from the debug code whenever a problem + in debug_object_assert_init is detected. + </para> + <para> + Called from debug_object_assert_init() with a hardcoded state + ODEBUG_STATE_NOTAVAILABLE when the object is not found in the + debug bucket. + </para> + <para> + The function returns 1 when the fixup was successful, + otherwise 0. The return value is used to update the + statistics. + </para> + <para> + Note, this function should make sure debug_object_init() is + called before returning. + </para> + <para> + The handling of statically initialized objects is a special + case. The fixup function should check if this is a legitimate + case of a statically initialized object or not. In this case only + debug_object_init() should be called to make the object known to + the tracker. Then the function should return 0 because this is not + a real fixup. + </para> + </sect1> </chapter> <chapter id="bugs"> <title>Known Bugs And Assumptions</title> diff --git a/Documentation/DocBook/device-drivers.tmpl b/Documentation/DocBook/device-drivers.tmpl index 94a20fe8fed..cc63f30de16 100644 --- a/Documentation/DocBook/device-drivers.tmpl +++ b/Documentation/DocBook/device-drivers.tmpl @@ -45,15 +45,21 @@ </sect1> <sect1><title>Atomic and pointer manipulation</title> -!Iarch/x86/include/asm/atomic_32.h -!Iarch/x86/include/asm/unaligned.h +!Iarch/x86/include/asm/atomic.h </sect1> <sect1><title>Delaying, scheduling, and timer routines</title> !Iinclude/linux/sched.h -!Ekernel/sched.c +!Ekernel/sched/core.c +!Ikernel/sched/cpupri.c +!Ikernel/sched/fair.c +!Iinclude/linux/completion.h !Ekernel/timer.c </sect1> + <sect1><title>Wait queues and Wake events</title> +!Iinclude/linux/wait.h +!Ekernel/sched/wait.c + </sect1> <sect1><title>High-resolution timers</title> !Iinclude/linux/ktime.h !Iinclude/linux/hrtimer.h @@ -78,10 +84,13 @@ X!Iinclude/linux/kobject.h <sect1><title>Kernel utility functions</title> !Iinclude/linux/kernel.h -!Ekernel/printk.c +!Ekernel/printk/printk.c !Ekernel/panic.c !Ekernel/sys.c -!Ekernel/rcupdate.c +!Ekernel/rcu/srcu.c +!Ekernel/rcu/tree.c +!Ekernel/rcu/tree_plugin.h +!Ekernel/rcu/update.c </sect1> <sect1><title>Device Resource Management</title> @@ -92,13 +101,16 @@ X!Iinclude/linux/kobject.h <chapter id="devdrivers"> <title>Device drivers infrastructure</title> + <sect1><title>The Basic Device Driver-Model Structures </title> +!Iinclude/linux/device.h + </sect1> <sect1><title>Device Drivers Base</title> -<!-- -X!Iinclude/linux/device.h ---> +!Idrivers/base/init.c !Edrivers/base/driver.c !Edrivers/base/core.c +!Edrivers/base/syscore.c !Edrivers/base/class.c +!Idrivers/base/node.c !Edrivers/base/firmware_class.c !Edrivers/base/transport_class.c <!-- Cannot be included, because @@ -107,13 +119,21 @@ X!Iinclude/linux/device.h exceed allowed 44 characters maximum X!Edrivers/base/attribute_container.c --> -!Edrivers/base/sys.c +!Edrivers/base/dd.c <!-- X!Edrivers/base/interface.c --> +!Iinclude/linux/platform_device.h !Edrivers/base/platform.c !Edrivers/base/bus.c </sect1> + <sect1><title>Device Drivers DMA Management</title> +!Edrivers/base/dma-buf.c +!Edrivers/base/reservation.c +!Iinclude/linux/reservation.h +!Edrivers/base/dma-coherent.c +!Edrivers/base/dma-mapping.c + </sect1> <sect1><title>Device Drivers Power Management</title> !Edrivers/base/power/main.c </sect1> @@ -211,9 +231,8 @@ X!Isound/sound_firmware.c <chapter id="uart16x50"> <title>16x50 UART Driver</title> -!Iinclude/linux/serial_core.h -!Edrivers/serial/serial_core.c -!Edrivers/serial/8250.c +!Edrivers/tty/serial/serial_core.c +!Edrivers/tty/serial/8250/8250_core.c </chapter> <chapter id="fbdev"> @@ -257,7 +276,7 @@ X!Isound/sound_firmware.c </para> <sect1><title>Frame Buffer Memory</title> -!Edrivers/video/fbmem.c +!Edrivers/video/fbdev/core/fbmem.c </sect1> <!-- <sect1><title>Frame Buffer Console</title> @@ -265,7 +284,7 @@ X!Edrivers/video/console/fbcon.c </sect1> --> <sect1><title>Frame Buffer Colormap</title> -!Edrivers/video/fbcmap.c +!Edrivers/video/fbdev/core/fbcmap.c </sect1> <!-- FIXME: drivers/video/fbgen.c has no docs, which stuffs up the sgml. Comment @@ -275,28 +294,45 @@ X!Idrivers/video/fbgen.c </sect1> KAO --> <sect1><title>Frame Buffer Video Mode Database</title> -!Idrivers/video/modedb.c -!Edrivers/video/modedb.c +!Idrivers/video/fbdev/core/modedb.c +!Edrivers/video/fbdev/core/modedb.c </sect1> <sect1><title>Frame Buffer Macintosh Video Mode Database</title> -!Edrivers/video/macmodes.c +!Edrivers/video/fbdev/macmodes.c </sect1> <sect1><title>Frame Buffer Fonts</title> <para> - Refer to the file drivers/video/console/fonts.c for more information. + Refer to the file lib/fonts/fonts.c for more information. </para> <!-- FIXME: Removed for now since no structured comments in source -X!Idrivers/video/console/fonts.c +X!Ilib/fonts/fonts.c --> </sect1> </chapter> <chapter id="input_subsystem"> <title>Input Subsystem</title> + <sect1><title>Input core</title> !Iinclude/linux/input.h !Edrivers/input/input.c !Edrivers/input/ff-core.c !Edrivers/input/ff-memless.c + </sect1> + <sect1><title>Multitouch Library</title> +!Iinclude/linux/input/mt.h +!Edrivers/input/input-mt.c + </sect1> + <sect1><title>Polled input devices</title> +!Iinclude/linux/input-polldev.h +!Edrivers/input/input-polldev.c + </sect1> + <sect1><title>Matrix keyboars/keypads</title> +!Iinclude/linux/input/matrix_keypad.h + </sect1> + <sect1><title>Sparse keymap support</title> +!Iinclude/linux/input/sparse-keymap.h +!Edrivers/input/sparse-keymap.c + </sect1> </chapter> <chapter id="spi"> @@ -415,4 +451,21 @@ X!Idrivers/video/console/fonts.c !Edrivers/i2c/i2c-core.c </chapter> + <chapter id="hsi"> + <title>High Speed Synchronous Serial Interface (HSI)</title> + + <para> + High Speed Synchronous Serial Interface (HSI) is a + serial interface mainly used for connecting application + engines (APE) with cellular modem engines (CMT) in cellular + handsets. + + HSI provides multiplexing for up to 16 logical channels, + low-latency and full duplex communication. + </para> + +!Iinclude/linux/hsi/hsi.h +!Edrivers/hsi/hsi.c + </chapter> + </book> diff --git a/Documentation/DocBook/deviceiobook.tmpl b/Documentation/DocBook/deviceiobook.tmpl index 3ed88126ab8..54199a0dcf9 100644 --- a/Documentation/DocBook/deviceiobook.tmpl +++ b/Documentation/DocBook/deviceiobook.tmpl @@ -316,8 +316,8 @@ CPU B: spin_unlock_irqrestore(&dev_lock, flags) <chapter id="pubfunctions"> <title>Public Functions Provided</title> -!Iarch/x86/include/asm/io_32.h -!Elib/iomap.c +!Iarch/x86/include/asm/io.h +!Elib/pci_iomap.c </chapter> </book> diff --git a/Documentation/DocBook/drm.tmpl b/Documentation/DocBook/drm.tmpl new file mode 100644 index 00000000000..7df3134ebc0 --- /dev/null +++ b/Documentation/DocBook/drm.tmpl @@ -0,0 +1,3945 @@ +<?xml version="1.0" encoding="UTF-8"?> +<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN" + "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" []> + +<book id="drmDevelopersGuide"> + <bookinfo> + <title>Linux DRM Developer's Guide</title> + + <authorgroup> + <author> + <firstname>Jesse</firstname> + <surname>Barnes</surname> + <contrib>Initial version</contrib> + <affiliation> + <orgname>Intel Corporation</orgname> + <address> + <email>jesse.barnes@intel.com</email> + </address> + </affiliation> + </author> + <author> + <firstname>Laurent</firstname> + <surname>Pinchart</surname> + <contrib>Driver internals</contrib> + <affiliation> + <orgname>Ideas on board SPRL</orgname> + <address> + <email>laurent.pinchart@ideasonboard.com</email> + </address> + </affiliation> + </author> + <author> + <firstname>Daniel</firstname> + <surname>Vetter</surname> + <contrib>Contributions all over the place</contrib> + <affiliation> + <orgname>Intel Corporation</orgname> + <address> + <email>daniel.vetter@ffwll.ch</email> + </address> + </affiliation> + </author> + </authorgroup> + + <copyright> + <year>2008-2009</year> + <year>2013-2014</year> + <holder>Intel Corporation</holder> + </copyright> + <copyright> + <year>2012</year> + <holder>Laurent Pinchart</holder> + </copyright> + + <legalnotice> + <para> + The contents of this file may be used under the terms of the GNU + General Public License version 2 (the "GPL") as distributed in + the kernel source COPYING file. + </para> + </legalnotice> + + <revhistory> + <!-- Put document revisions here, newest first. --> + <revision> + <revnumber>1.0</revnumber> + <date>2012-07-13</date> + <authorinitials>LP</authorinitials> + <revremark>Added extensive documentation about driver internals. + </revremark> + </revision> + </revhistory> + </bookinfo> + +<toc></toc> + +<part id="drmCore"> + <title>DRM Core</title> + <partintro> + <para> + This first part of the DRM Developer's Guide documents core DRM code, + helper libraries for writing drivers and generic userspace interfaces + exposed by DRM drivers. + </para> + </partintro> + + <chapter id="drmIntroduction"> + <title>Introduction</title> + <para> + The Linux DRM layer contains code intended to support the needs + of complex graphics devices, usually containing programmable + pipelines well suited to 3D graphics acceleration. Graphics + drivers in the kernel may make use of DRM functions to make + tasks like memory management, interrupt handling and DMA easier, + and provide a uniform interface to applications. + </para> + <para> + A note on versions: this guide covers features found in the DRM + tree, including the TTM memory manager, output configuration and + mode setting, and the new vblank internals, in addition to all + the regular features found in current kernels. + </para> + <para> + [Insert diagram of typical DRM stack here] + </para> + </chapter> + + <!-- Internals --> + + <chapter id="drmInternals"> + <title>DRM Internals</title> + <para> + This chapter documents DRM internals relevant to driver authors + and developers working to add support for the latest features to + existing drivers. + </para> + <para> + First, we go over some typical driver initialization + requirements, like setting up command buffers, creating an + initial output configuration, and initializing core services. + Subsequent sections cover core internals in more detail, + providing implementation notes and examples. + </para> + <para> + The DRM layer provides several services to graphics drivers, + many of them driven by the application interfaces it provides + through libdrm, the library that wraps most of the DRM ioctls. + These include vblank event handling, memory + management, output management, framebuffer management, command + submission & fencing, suspend/resume support, and DMA + services. + </para> + + <!-- Internals: driver init --> + + <sect1> + <title>Driver Initialization</title> + <para> + At the core of every DRM driver is a <structname>drm_driver</structname> + structure. Drivers typically statically initialize a drm_driver structure, + and then pass it to one of the <function>drm_*_init()</function> functions + to register it with the DRM subsystem. + </para> + <para> + Newer drivers that no longer require a <structname>drm_bus</structname> + structure can alternatively use the low-level device initialization and + registration functions such as <function>drm_dev_alloc()</function> and + <function>drm_dev_register()</function> directly. + </para> + <para> + The <structname>drm_driver</structname> structure contains static + information that describes the driver and features it supports, and + pointers to methods that the DRM core will call to implement the DRM API. + We will first go through the <structname>drm_driver</structname> static + information fields, and will then describe individual operations in + details as they get used in later sections. + </para> + <sect2> + <title>Driver Information</title> + <sect3> + <title>Driver Features</title> + <para> + Drivers inform the DRM core about their requirements and supported + features by setting appropriate flags in the + <structfield>driver_features</structfield> field. Since those flags + influence the DRM core behaviour since registration time, most of them + must be set to registering the <structname>drm_driver</structname> + instance. + </para> + <synopsis>u32 driver_features;</synopsis> + <variablelist> + <title>Driver Feature Flags</title> + <varlistentry> + <term>DRIVER_USE_AGP</term> + <listitem><para> + Driver uses AGP interface, the DRM core will manage AGP resources. + </para></listitem> + </varlistentry> + <varlistentry> + <term>DRIVER_REQUIRE_AGP</term> + <listitem><para> + Driver needs AGP interface to function. AGP initialization failure + will become a fatal error. + </para></listitem> + </varlistentry> + <varlistentry> + <term>DRIVER_PCI_DMA</term> + <listitem><para> + Driver is capable of PCI DMA, mapping of PCI DMA buffers to + userspace will be enabled. Deprecated. + </para></listitem> + </varlistentry> + <varlistentry> + <term>DRIVER_SG</term> + <listitem><para> + Driver can perform scatter/gather DMA, allocation and mapping of + scatter/gather buffers will be enabled. Deprecated. + </para></listitem> + </varlistentry> + <varlistentry> + <term>DRIVER_HAVE_DMA</term> + <listitem><para> + Driver supports DMA, the userspace DMA API will be supported. + Deprecated. + </para></listitem> + </varlistentry> + <varlistentry> + <term>DRIVER_HAVE_IRQ</term><term>DRIVER_IRQ_SHARED</term> + <listitem><para> + DRIVER_HAVE_IRQ indicates whether the driver has an IRQ handler + managed by the DRM Core. The core will support simple IRQ handler + installation when the flag is set. The installation process is + described in <xref linkend="drm-irq-registration"/>.</para> + <para>DRIVER_IRQ_SHARED indicates whether the device & handler + support shared IRQs (note that this is required of PCI drivers). + </para></listitem> + </varlistentry> + <varlistentry> + <term>DRIVER_GEM</term> + <listitem><para> + Driver use the GEM memory manager. + </para></listitem> + </varlistentry> + <varlistentry> + <term>DRIVER_MODESET</term> + <listitem><para> + Driver supports mode setting interfaces (KMS). + </para></listitem> + </varlistentry> + <varlistentry> + <term>DRIVER_PRIME</term> + <listitem><para> + Driver implements DRM PRIME buffer sharing. + </para></listitem> + </varlistentry> + <varlistentry> + <term>DRIVER_RENDER</term> + <listitem><para> + Driver supports dedicated render nodes. + </para></listitem> + </varlistentry> + </variablelist> + </sect3> + <sect3> + <title>Major, Minor and Patchlevel</title> + <synopsis>int major; +int minor; +int patchlevel;</synopsis> + <para> + The DRM core identifies driver versions by a major, minor and patch + level triplet. The information is printed to the kernel log at + initialization time and passed to userspace through the + DRM_IOCTL_VERSION ioctl. + </para> + <para> + The major and minor numbers are also used to verify the requested driver + API version passed to DRM_IOCTL_SET_VERSION. When the driver API changes + between minor versions, applications can call DRM_IOCTL_SET_VERSION to + select a specific version of the API. If the requested major isn't equal + to the driver major, or the requested minor is larger than the driver + minor, the DRM_IOCTL_SET_VERSION call will return an error. Otherwise + the driver's set_version() method will be called with the requested + version. + </para> + </sect3> + <sect3> + <title>Name, Description and Date</title> + <synopsis>char *name; +char *desc; +char *date;</synopsis> + <para> + The driver name is printed to the kernel log at initialization time, + used for IRQ registration and passed to userspace through + DRM_IOCTL_VERSION. + </para> + <para> + The driver description is a purely informative string passed to + userspace through the DRM_IOCTL_VERSION ioctl and otherwise unused by + the kernel. + </para> + <para> + The driver date, formatted as YYYYMMDD, is meant to identify the date of + the latest modification to the driver. However, as most drivers fail to + update it, its value is mostly useless. The DRM core prints it to the + kernel log at initialization time and passes it to userspace through the + DRM_IOCTL_VERSION ioctl. + </para> + </sect3> + </sect2> + <sect2> + <title>Device Registration</title> + <para> + A number of functions are provided to help with device registration. + The functions deal with PCI, USB and platform devices, respectively. + </para> +!Edrivers/gpu/drm/drm_pci.c +!Edrivers/gpu/drm/drm_usb.c +!Edrivers/gpu/drm/drm_platform.c + <para> + New drivers that no longer rely on the services provided by the + <structname>drm_bus</structname> structure can call the low-level + device registration functions directly. The + <function>drm_dev_alloc()</function> function can be used to allocate + and initialize a new <structname>drm_device</structname> structure. + Drivers will typically want to perform some additional setup on this + structure, such as allocating driver-specific data and storing a + pointer to it in the DRM device's <structfield>dev_private</structfield> + field. Drivers should also set the device's unique name using the + <function>drm_dev_set_unique()</function> function. After it has been + set up a device can be registered with the DRM subsystem by calling + <function>drm_dev_register()</function>. This will cause the device to + be exposed to userspace and will call the driver's + <structfield>.load()</structfield> implementation. When a device is + removed, the DRM device can safely be unregistered and freed by calling + <function>drm_dev_unregister()</function> followed by a call to + <function>drm_dev_unref()</function>. + </para> +!Edrivers/gpu/drm/drm_stub.c + </sect2> + <sect2> + <title>Driver Load</title> + <para> + The <methodname>load</methodname> method is the driver and device + initialization entry point. The method is responsible for allocating and + initializing driver private data, performing resource allocation and + mapping (e.g. acquiring + clocks, mapping registers or allocating command buffers), initializing + the memory manager (<xref linkend="drm-memory-management"/>), installing + the IRQ handler (<xref linkend="drm-irq-registration"/>), setting up + vertical blanking handling (<xref linkend="drm-vertical-blank"/>), mode + setting (<xref linkend="drm-mode-setting"/>) and initial output + configuration (<xref linkend="drm-kms-init"/>). + </para> + <note><para> + If compatibility is a concern (e.g. with drivers converted over from + User Mode Setting to Kernel Mode Setting), care must be taken to prevent + device initialization and control that is incompatible with currently + active userspace drivers. For instance, if user level mode setting + drivers are in use, it would be problematic to perform output discovery + & configuration at load time. Likewise, if user-level drivers + unaware of memory management are in use, memory management and command + buffer setup may need to be omitted. These requirements are + driver-specific, and care needs to be taken to keep both old and new + applications and libraries working. + </para></note> + <synopsis>int (*load) (struct drm_device *, unsigned long flags);</synopsis> + <para> + The method takes two arguments, a pointer to the newly created + <structname>drm_device</structname> and flags. The flags are used to + pass the <structfield>driver_data</structfield> field of the device id + corresponding to the device passed to <function>drm_*_init()</function>. + Only PCI devices currently use this, USB and platform DRM drivers have + their <methodname>load</methodname> method called with flags to 0. + </para> + <sect3> + <title>Driver Private Data</title> + <para> + The driver private hangs off the main + <structname>drm_device</structname> structure and can be used for + tracking various device-specific bits of information, like register + offsets, command buffer status, register state for suspend/resume, etc. + At load time, a driver may simply allocate one and set + <structname>drm_device</structname>.<structfield>dev_priv</structfield> + appropriately; it should be freed and + <structname>drm_device</structname>.<structfield>dev_priv</structfield> + set to NULL when the driver is unloaded. + </para> + </sect3> + <sect3 id="drm-irq-registration"> + <title>IRQ Registration</title> + <para> + The DRM core tries to facilitate IRQ handler registration and + unregistration by providing <function>drm_irq_install</function> and + <function>drm_irq_uninstall</function> functions. Those functions only + support a single interrupt per device, devices that use more than one + IRQs need to be handled manually. + </para> + <sect4> + <title>Managed IRQ Registration</title> + <para> + <function>drm_irq_install</function> starts by calling the + <methodname>irq_preinstall</methodname> driver operation. The operation + is optional and must make sure that the interrupt will not get fired by + clearing all pending interrupt flags or disabling the interrupt. + </para> + <para> + The passed-in IRQ will then be requested by a call to + <function>request_irq</function>. If the DRIVER_IRQ_SHARED driver + feature flag is set, a shared (IRQF_SHARED) IRQ handler will be + requested. + </para> + <para> + The IRQ handler function must be provided as the mandatory irq_handler + driver operation. It will get passed directly to + <function>request_irq</function> and thus has the same prototype as all + IRQ handlers. It will get called with a pointer to the DRM device as the + second argument. + </para> + <para> + Finally the function calls the optional + <methodname>irq_postinstall</methodname> driver operation. The operation + usually enables interrupts (excluding the vblank interrupt, which is + enabled separately), but drivers may choose to enable/disable interrupts + at a different time. + </para> + <para> + <function>drm_irq_uninstall</function> is similarly used to uninstall an + IRQ handler. It starts by waking up all processes waiting on a vblank + interrupt to make sure they don't hang, and then calls the optional + <methodname>irq_uninstall</methodname> driver operation. The operation + must disable all hardware interrupts. Finally the function frees the IRQ + by calling <function>free_irq</function>. + </para> + </sect4> + <sect4> + <title>Manual IRQ Registration</title> + <para> + Drivers that require multiple interrupt handlers can't use the managed + IRQ registration functions. In that case IRQs must be registered and + unregistered manually (usually with the <function>request_irq</function> + and <function>free_irq</function> functions, or their devm_* equivalent). + </para> + <para> + When manually registering IRQs, drivers must not set the DRIVER_HAVE_IRQ + driver feature flag, and must not provide the + <methodname>irq_handler</methodname> driver operation. They must set the + <structname>drm_device</structname> <structfield>irq_enabled</structfield> + field to 1 upon registration of the IRQs, and clear it to 0 after + unregistering the IRQs. + </para> + </sect4> + </sect3> + <sect3> + <title>Memory Manager Initialization</title> + <para> + Every DRM driver requires a memory manager which must be initialized at + load time. DRM currently contains two memory managers, the Translation + Table Manager (TTM) and the Graphics Execution Manager (GEM). + This document describes the use of the GEM memory manager only. See + <xref linkend="drm-memory-management"/> for details. + </para> + </sect3> + <sect3> + <title>Miscellaneous Device Configuration</title> + <para> + Another task that may be necessary for PCI devices during configuration + is mapping the video BIOS. On many devices, the VBIOS describes device + configuration, LCD panel timings (if any), and contains flags indicating + device state. Mapping the BIOS can be done using the pci_map_rom() call, + a convenience function that takes care of mapping the actual ROM, + whether it has been shadowed into memory (typically at address 0xc0000) + or exists on the PCI device in the ROM BAR. Note that after the ROM has + been mapped and any necessary information has been extracted, it should + be unmapped; on many devices, the ROM address decoder is shared with + other BARs, so leaving it mapped could cause undesired behaviour like + hangs or memory corruption. + <!--!Fdrivers/pci/rom.c pci_map_rom--> + </para> + </sect3> + </sect2> + </sect1> + + <!-- Internals: memory management --> + + <sect1 id="drm-memory-management"> + <title>Memory management</title> + <para> + Modern Linux systems require large amount of graphics memory to store + frame buffers, textures, vertices and other graphics-related data. Given + the very dynamic nature of many of that data, managing graphics memory + efficiently is thus crucial for the graphics stack and plays a central + role in the DRM infrastructure. + </para> + <para> + The DRM core includes two memory managers, namely Translation Table Maps + (TTM) and Graphics Execution Manager (GEM). TTM was the first DRM memory + manager to be developed and tried to be a one-size-fits-them all + solution. It provides a single userspace API to accommodate the need of + all hardware, supporting both Unified Memory Architecture (UMA) devices + and devices with dedicated video RAM (i.e. most discrete video cards). + This resulted in a large, complex piece of code that turned out to be + hard to use for driver development. + </para> + <para> + GEM started as an Intel-sponsored project in reaction to TTM's + complexity. Its design philosophy is completely different: instead of + providing a solution to every graphics memory-related problems, GEM + identified common code between drivers and created a support library to + share it. GEM has simpler initialization and execution requirements than + TTM, but has no video RAM management capabilities and is thus limited to + UMA devices. + </para> + <sect2> + <title>The Translation Table Manager (TTM)</title> + <para> + TTM design background and information belongs here. + </para> + <sect3> + <title>TTM initialization</title> + <warning><para>This section is outdated.</para></warning> + <para> + Drivers wishing to support TTM must fill out a drm_bo_driver + structure. The structure contains several fields with function + pointers for initializing the TTM, allocating and freeing memory, + waiting for command completion and fence synchronization, and memory + migration. See the radeon_ttm.c file for an example of usage. + </para> + <para> + The ttm_global_reference structure is made up of several fields: + </para> + <programlisting> + struct ttm_global_reference { + enum ttm_global_types global_type; + size_t size; + void *object; + int (*init) (struct ttm_global_reference *); + void (*release) (struct ttm_global_reference *); + }; + </programlisting> + <para> + There should be one global reference structure for your memory + manager as a whole, and there will be others for each object + created by the memory manager at runtime. Your global TTM should + have a type of TTM_GLOBAL_TTM_MEM. The size field for the global + object should be sizeof(struct ttm_mem_global), and the init and + release hooks should point at your driver-specific init and + release routines, which probably eventually call + ttm_mem_global_init and ttm_mem_global_release, respectively. + </para> + <para> + Once your global TTM accounting structure is set up and initialized + by calling ttm_global_item_ref() on it, + you need to create a buffer object TTM to + provide a pool for buffer object allocation by clients and the + kernel itself. The type of this object should be TTM_GLOBAL_TTM_BO, + and its size should be sizeof(struct ttm_bo_global). Again, + driver-specific init and release functions may be provided, + likely eventually calling ttm_bo_global_init() and + ttm_bo_global_release(), respectively. Also, like the previous + object, ttm_global_item_ref() is used to create an initial reference + count for the TTM, which will call your initialization function. + </para> + </sect3> + </sect2> + <sect2 id="drm-gem"> + <title>The Graphics Execution Manager (GEM)</title> + <para> + The GEM design approach has resulted in a memory manager that doesn't + provide full coverage of all (or even all common) use cases in its + userspace or kernel API. GEM exposes a set of standard memory-related + operations to userspace and a set of helper functions to drivers, and let + drivers implement hardware-specific operations with their own private API. + </para> + <para> + The GEM userspace API is described in the + <ulink url="http://lwn.net/Articles/283798/"><citetitle>GEM - the Graphics + Execution Manager</citetitle></ulink> article on LWN. While slightly + outdated, the document provides a good overview of the GEM API principles. + Buffer allocation and read and write operations, described as part of the + common GEM API, are currently implemented using driver-specific ioctls. + </para> + <para> + GEM is data-agnostic. It manages abstract buffer objects without knowing + what individual buffers contain. APIs that require knowledge of buffer + contents or purpose, such as buffer allocation or synchronization + primitives, are thus outside of the scope of GEM and must be implemented + using driver-specific ioctls. + </para> + <para> + On a fundamental level, GEM involves several operations: + <itemizedlist> + <listitem>Memory allocation and freeing</listitem> + <listitem>Command execution</listitem> + <listitem>Aperture management at command execution time</listitem> + </itemizedlist> + Buffer object allocation is relatively straightforward and largely + provided by Linux's shmem layer, which provides memory to back each + object. + </para> + <para> + Device-specific operations, such as command execution, pinning, buffer + read & write, mapping, and domain ownership transfers are left to + driver-specific ioctls. + </para> + <sect3> + <title>GEM Initialization</title> + <para> + Drivers that use GEM must set the DRIVER_GEM bit in the struct + <structname>drm_driver</structname> + <structfield>driver_features</structfield> field. The DRM core will + then automatically initialize the GEM core before calling the + <methodname>load</methodname> operation. Behind the scene, this will + create a DRM Memory Manager object which provides an address space + pool for object allocation. + </para> + <para> + In a KMS configuration, drivers need to allocate and initialize a + command ring buffer following core GEM initialization if required by + the hardware. UMA devices usually have what is called a "stolen" + memory region, which provides space for the initial framebuffer and + large, contiguous memory regions required by the device. This space is + typically not managed by GEM, and must be initialized separately into + its own DRM MM object. + </para> + </sect3> + <sect3> + <title>GEM Objects Creation</title> + <para> + GEM splits creation of GEM objects and allocation of the memory that + backs them in two distinct operations. + </para> + <para> + GEM objects are represented by an instance of struct + <structname>drm_gem_object</structname>. Drivers usually need to extend + GEM objects with private information and thus create a driver-specific + GEM object structure type that embeds an instance of struct + <structname>drm_gem_object</structname>. + </para> + <para> + To create a GEM object, a driver allocates memory for an instance of its + specific GEM object type and initializes the embedded struct + <structname>drm_gem_object</structname> with a call to + <function>drm_gem_object_init</function>. The function takes a pointer to + the DRM device, a pointer to the GEM object and the buffer object size + in bytes. + </para> + <para> + GEM uses shmem to allocate anonymous pageable memory. + <function>drm_gem_object_init</function> will create an shmfs file of + the requested size and store it into the struct + <structname>drm_gem_object</structname> <structfield>filp</structfield> + field. The memory is used as either main storage for the object when the + graphics hardware uses system memory directly or as a backing store + otherwise. + </para> + <para> + Drivers are responsible for the actual physical pages allocation by + calling <function>shmem_read_mapping_page_gfp</function> for each page. + Note that they can decide to allocate pages when initializing the GEM + object, or to delay allocation until the memory is needed (for instance + when a page fault occurs as a result of a userspace memory access or + when the driver needs to start a DMA transfer involving the memory). + </para> + <para> + Anonymous pageable memory allocation is not always desired, for instance + when the hardware requires physically contiguous system memory as is + often the case in embedded devices. Drivers can create GEM objects with + no shmfs backing (called private GEM objects) by initializing them with + a call to <function>drm_gem_private_object_init</function> instead of + <function>drm_gem_object_init</function>. Storage for private GEM + objects must be managed by drivers. + </para> + <para> + Drivers that do not need to extend GEM objects with private information + can call the <function>drm_gem_object_alloc</function> function to + allocate and initialize a struct <structname>drm_gem_object</structname> + instance. The GEM core will call the optional driver + <methodname>gem_init_object</methodname> operation after initializing + the GEM object with <function>drm_gem_object_init</function>. + <synopsis>int (*gem_init_object) (struct drm_gem_object *obj);</synopsis> + </para> + <para> + No alloc-and-init function exists for private GEM objects. + </para> + </sect3> + <sect3> + <title>GEM Objects Lifetime</title> + <para> + All GEM objects are reference-counted by the GEM core. References can be + acquired and release by <function>calling drm_gem_object_reference</function> + and <function>drm_gem_object_unreference</function> respectively. The + caller must hold the <structname>drm_device</structname> + <structfield>struct_mutex</structfield> lock. As a convenience, GEM + provides the <function>drm_gem_object_reference_unlocked</function> and + <function>drm_gem_object_unreference_unlocked</function> functions that + can be called without holding the lock. + </para> + <para> + When the last reference to a GEM object is released the GEM core calls + the <structname>drm_driver</structname> + <methodname>gem_free_object</methodname> operation. That operation is + mandatory for GEM-enabled drivers and must free the GEM object and all + associated resources. + </para> + <para> + <synopsis>void (*gem_free_object) (struct drm_gem_object *obj);</synopsis> + Drivers are responsible for freeing all GEM object resources, including + the resources created by the GEM core. If an mmap offset has been + created for the object (in which case + <structname>drm_gem_object</structname>::<structfield>map_list</structfield>::<structfield>map</structfield> + is not NULL) it must be freed by a call to + <function>drm_gem_free_mmap_offset</function>. The shmfs backing store + must be released by calling <function>drm_gem_object_release</function> + (that function can safely be called if no shmfs backing store has been + created). + </para> + </sect3> + <sect3> + <title>GEM Objects Naming</title> + <para> + Communication between userspace and the kernel refers to GEM objects + using local handles, global names or, more recently, file descriptors. + All of those are 32-bit integer values; the usual Linux kernel limits + apply to the file descriptors. + </para> + <para> + GEM handles are local to a DRM file. Applications get a handle to a GEM + object through a driver-specific ioctl, and can use that handle to refer + to the GEM object in other standard or driver-specific ioctls. Closing a + DRM file handle frees all its GEM handles and dereferences the + associated GEM objects. + </para> + <para> + To create a handle for a GEM object drivers call + <function>drm_gem_handle_create</function>. The function takes a pointer + to the DRM file and the GEM object and returns a locally unique handle. + When the handle is no longer needed drivers delete it with a call to + <function>drm_gem_handle_delete</function>. Finally the GEM object + associated with a handle can be retrieved by a call to + <function>drm_gem_object_lookup</function>. + </para> + <para> + Handles don't take ownership of GEM objects, they only take a reference + to the object that will be dropped when the handle is destroyed. To + avoid leaking GEM objects, drivers must make sure they drop the + reference(s) they own (such as the initial reference taken at object + creation time) as appropriate, without any special consideration for the + handle. For example, in the particular case of combined GEM object and + handle creation in the implementation of the + <methodname>dumb_create</methodname> operation, drivers must drop the + initial reference to the GEM object before returning the handle. + </para> + <para> + GEM names are similar in purpose to handles but are not local to DRM + files. They can be passed between processes to reference a GEM object + globally. Names can't be used directly to refer to objects in the DRM + API, applications must convert handles to names and names to handles + using the DRM_IOCTL_GEM_FLINK and DRM_IOCTL_GEM_OPEN ioctls + respectively. The conversion is handled by the DRM core without any + driver-specific support. + </para> + <para> + GEM also supports buffer sharing with dma-buf file descriptors through + PRIME. GEM-based drivers must use the provided helpers functions to + implement the exporting and importing correctly. See <xref linkend="drm-prime-support" />. + Since sharing file descriptors is inherently more secure than the + easily guessable and global GEM names it is the preferred buffer + sharing mechanism. Sharing buffers through GEM names is only supported + for legacy userspace. Furthermore PRIME also allows cross-device + buffer sharing since it is based on dma-bufs. + </para> + </sect3> + <sect3 id="drm-gem-objects-mapping"> + <title>GEM Objects Mapping</title> + <para> + Because mapping operations are fairly heavyweight GEM favours + read/write-like access to buffers, implemented through driver-specific + ioctls, over mapping buffers to userspace. However, when random access + to the buffer is needed (to perform software rendering for instance), + direct access to the object can be more efficient. + </para> + <para> + The mmap system call can't be used directly to map GEM objects, as they + don't have their own file handle. Two alternative methods currently + co-exist to map GEM objects to userspace. The first method uses a + driver-specific ioctl to perform the mapping operation, calling + <function>do_mmap</function> under the hood. This is often considered + dubious, seems to be discouraged for new GEM-enabled drivers, and will + thus not be described here. + </para> + <para> + The second method uses the mmap system call on the DRM file handle. + <synopsis>void *mmap(void *addr, size_t length, int prot, int flags, int fd, + off_t offset);</synopsis> + DRM identifies the GEM object to be mapped by a fake offset passed + through the mmap offset argument. Prior to being mapped, a GEM object + must thus be associated with a fake offset. To do so, drivers must call + <function>drm_gem_create_mmap_offset</function> on the object. The + function allocates a fake offset range from a pool and stores the + offset divided by PAGE_SIZE in + <literal>obj->map_list.hash.key</literal>. Care must be taken not to + call <function>drm_gem_create_mmap_offset</function> if a fake offset + has already been allocated for the object. This can be tested by + <literal>obj->map_list.map</literal> being non-NULL. + </para> + <para> + Once allocated, the fake offset value + (<literal>obj->map_list.hash.key << PAGE_SHIFT</literal>) + must be passed to the application in a driver-specific way and can then + be used as the mmap offset argument. + </para> + <para> + The GEM core provides a helper method <function>drm_gem_mmap</function> + to handle object mapping. The method can be set directly as the mmap + file operation handler. It will look up the GEM object based on the + offset value and set the VMA operations to the + <structname>drm_driver</structname> <structfield>gem_vm_ops</structfield> + field. Note that <function>drm_gem_mmap</function> doesn't map memory to + userspace, but relies on the driver-provided fault handler to map pages + individually. + </para> + <para> + To use <function>drm_gem_mmap</function>, drivers must fill the struct + <structname>drm_driver</structname> <structfield>gem_vm_ops</structfield> + field with a pointer to VM operations. + </para> + <para> + <synopsis>struct vm_operations_struct *gem_vm_ops + + struct vm_operations_struct { + void (*open)(struct vm_area_struct * area); + void (*close)(struct vm_area_struct * area); + int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf); + };</synopsis> + </para> + <para> + The <methodname>open</methodname> and <methodname>close</methodname> + operations must update the GEM object reference count. Drivers can use + the <function>drm_gem_vm_open</function> and + <function>drm_gem_vm_close</function> helper functions directly as open + and close handlers. + </para> + <para> + The fault operation handler is responsible for mapping individual pages + to userspace when a page fault occurs. Depending on the memory + allocation scheme, drivers can allocate pages at fault time, or can + decide to allocate memory for the GEM object at the time the object is + created. + </para> + <para> + Drivers that want to map the GEM object upfront instead of handling page + faults can implement their own mmap file operation handler. + </para> + </sect3> + <sect3> + <title>Memory Coherency</title> + <para> + When mapped to the device or used in a command buffer, backing pages + for an object are flushed to memory and marked write combined so as to + be coherent with the GPU. Likewise, if the CPU accesses an object + after the GPU has finished rendering to the object, then the object + must be made coherent with the CPU's view of memory, usually involving + GPU cache flushing of various kinds. This core CPU<->GPU + coherency management is provided by a device-specific ioctl, which + evaluates an object's current domain and performs any necessary + flushing or synchronization to put the object into the desired + coherency domain (note that the object may be busy, i.e. an active + render target; in that case, setting the domain blocks the client and + waits for rendering to complete before performing any necessary + flushing operations). + </para> + </sect3> + <sect3> + <title>Command Execution</title> + <para> + Perhaps the most important GEM function for GPU devices is providing a + command execution interface to clients. Client programs construct + command buffers containing references to previously allocated memory + objects, and then submit them to GEM. At that point, GEM takes care to + bind all the objects into the GTT, execute the buffer, and provide + necessary synchronization between clients accessing the same buffers. + This often involves evicting some objects from the GTT and re-binding + others (a fairly expensive operation), and providing relocation + support which hides fixed GTT offsets from clients. Clients must take + care not to submit command buffers that reference more objects than + can fit in the GTT; otherwise, GEM will reject them and no rendering + will occur. Similarly, if several objects in the buffer require fence + registers to be allocated for correct rendering (e.g. 2D blits on + pre-965 chips), care must be taken not to require more fence registers + than are available to the client. Such resource management should be + abstracted from the client in libdrm. + </para> + </sect3> + <sect3> + <title>GEM Function Reference</title> +!Edrivers/gpu/drm/drm_gem.c + </sect3> + </sect2> + <sect2> + <title>VMA Offset Manager</title> +!Pdrivers/gpu/drm/drm_vma_manager.c vma offset manager +!Edrivers/gpu/drm/drm_vma_manager.c +!Iinclude/drm/drm_vma_manager.h + </sect2> + <sect2 id="drm-prime-support"> + <title>PRIME Buffer Sharing</title> + <para> + PRIME is the cross device buffer sharing framework in drm, originally + created for the OPTIMUS range of multi-gpu platforms. To userspace + PRIME buffers are dma-buf based file descriptors. + </para> + <sect3> + <title>Overview and Driver Interface</title> + <para> + Similar to GEM global names, PRIME file descriptors are + also used to share buffer objects across processes. They offer + additional security: as file descriptors must be explicitly sent over + UNIX domain sockets to be shared between applications, they can't be + guessed like the globally unique GEM names. + </para> + <para> + Drivers that support the PRIME + API must set the DRIVER_PRIME bit in the struct + <structname>drm_driver</structname> + <structfield>driver_features</structfield> field, and implement the + <methodname>prime_handle_to_fd</methodname> and + <methodname>prime_fd_to_handle</methodname> operations. + </para> + <para> + <synopsis>int (*prime_handle_to_fd)(struct drm_device *dev, + struct drm_file *file_priv, uint32_t handle, + uint32_t flags, int *prime_fd); +int (*prime_fd_to_handle)(struct drm_device *dev, + struct drm_file *file_priv, int prime_fd, + uint32_t *handle);</synopsis> + Those two operations convert a handle to a PRIME file descriptor and + vice versa. Drivers must use the kernel dma-buf buffer sharing framework + to manage the PRIME file descriptors. Similar to the mode setting + API PRIME is agnostic to the underlying buffer object manager, as + long as handles are 32bit unsigned integers. + </para> + <para> + While non-GEM drivers must implement the operations themselves, GEM + drivers must use the <function>drm_gem_prime_handle_to_fd</function> + and <function>drm_gem_prime_fd_to_handle</function> helper functions. + Those helpers rely on the driver + <methodname>gem_prime_export</methodname> and + <methodname>gem_prime_import</methodname> operations to create a dma-buf + instance from a GEM object (dma-buf exporter role) and to create a GEM + object from a dma-buf instance (dma-buf importer role). + </para> + <para> + <synopsis>struct dma_buf * (*gem_prime_export)(struct drm_device *dev, + struct drm_gem_object *obj, + int flags); +struct drm_gem_object * (*gem_prime_import)(struct drm_device *dev, + struct dma_buf *dma_buf);</synopsis> + These two operations are mandatory for GEM drivers that support + PRIME. + </para> + </sect3> + <sect3> + <title>PRIME Helper Functions</title> +!Pdrivers/gpu/drm/drm_prime.c PRIME Helpers + </sect3> + </sect2> + <sect2> + <title>PRIME Function References</title> +!Edrivers/gpu/drm/drm_prime.c + </sect2> + <sect2> + <title>DRM MM Range Allocator</title> + <sect3> + <title>Overview</title> +!Pdrivers/gpu/drm/drm_mm.c Overview + </sect3> + <sect3> + <title>LRU Scan/Eviction Support</title> +!Pdrivers/gpu/drm/drm_mm.c lru scan roaster + </sect3> + </sect2> + <sect2> + <title>DRM MM Range Allocator Function References</title> +!Edrivers/gpu/drm/drm_mm.c +!Iinclude/drm/drm_mm.h + </sect2> + </sect1> + + <!-- Internals: mode setting --> + + <sect1 id="drm-mode-setting"> + <title>Mode Setting</title> + <para> + Drivers must initialize the mode setting core by calling + <function>drm_mode_config_init</function> on the DRM device. The function + initializes the <structname>drm_device</structname> + <structfield>mode_config</structfield> field and never fails. Once done, + mode configuration must be setup by initializing the following fields. + </para> + <itemizedlist> + <listitem> + <synopsis>int min_width, min_height; +int max_width, max_height;</synopsis> + <para> + Minimum and maximum width and height of the frame buffers in pixel + units. + </para> + </listitem> + <listitem> + <synopsis>struct drm_mode_config_funcs *funcs;</synopsis> + <para>Mode setting functions.</para> + </listitem> + </itemizedlist> + <sect2> + <title>Display Modes Function Reference</title> +!Iinclude/drm/drm_modes.h +!Edrivers/gpu/drm/drm_modes.c + </sect2> + <sect2> + <title>Frame Buffer Creation</title> + <synopsis>struct drm_framebuffer *(*fb_create)(struct drm_device *dev, + struct drm_file *file_priv, + struct drm_mode_fb_cmd2 *mode_cmd);</synopsis> + <para> + Frame buffers are abstract memory objects that provide a source of + pixels to scanout to a CRTC. Applications explicitly request the + creation of frame buffers through the DRM_IOCTL_MODE_ADDFB(2) ioctls and + receive an opaque handle that can be passed to the KMS CRTC control, + plane configuration and page flip functions. + </para> + <para> + Frame buffers rely on the underneath memory manager for low-level memory + operations. When creating a frame buffer applications pass a memory + handle (or a list of memory handles for multi-planar formats) through + the <parameter>drm_mode_fb_cmd2</parameter> argument. For drivers using + GEM as their userspace buffer management interface this would be a GEM + handle. Drivers are however free to use their own backing storage object + handles, e.g. vmwgfx directly exposes special TTM handles to userspace + and so expects TTM handles in the create ioctl and not GEM handles. + </para> + <para> + Drivers must first validate the requested frame buffer parameters passed + through the mode_cmd argument. In particular this is where invalid + sizes, pixel formats or pitches can be caught. + </para> + <para> + If the parameters are deemed valid, drivers then create, initialize and + return an instance of struct <structname>drm_framebuffer</structname>. + If desired the instance can be embedded in a larger driver-specific + structure. Drivers must fill its <structfield>width</structfield>, + <structfield>height</structfield>, <structfield>pitches</structfield>, + <structfield>offsets</structfield>, <structfield>depth</structfield>, + <structfield>bits_per_pixel</structfield> and + <structfield>pixel_format</structfield> fields from the values passed + through the <parameter>drm_mode_fb_cmd2</parameter> argument. They + should call the <function>drm_helper_mode_fill_fb_struct</function> + helper function to do so. + </para> + + <para> + The initialization of the new framebuffer instance is finalized with a + call to <function>drm_framebuffer_init</function> which takes a pointer + to DRM frame buffer operations (struct + <structname>drm_framebuffer_funcs</structname>). Note that this function + publishes the framebuffer and so from this point on it can be accessed + concurrently from other threads. Hence it must be the last step in the + driver's framebuffer initialization sequence. Frame buffer operations + are + <itemizedlist> + <listitem> + <synopsis>int (*create_handle)(struct drm_framebuffer *fb, + struct drm_file *file_priv, unsigned int *handle);</synopsis> + <para> + Create a handle to the frame buffer underlying memory object. If + the frame buffer uses a multi-plane format, the handle will + reference the memory object associated with the first plane. + </para> + <para> + Drivers call <function>drm_gem_handle_create</function> to create + the handle. + </para> + </listitem> + <listitem> + <synopsis>void (*destroy)(struct drm_framebuffer *framebuffer);</synopsis> + <para> + Destroy the frame buffer object and frees all associated + resources. Drivers must call + <function>drm_framebuffer_cleanup</function> to free resources + allocated by the DRM core for the frame buffer object, and must + make sure to unreference all memory objects associated with the + frame buffer. Handles created by the + <methodname>create_handle</methodname> operation are released by + the DRM core. + </para> + </listitem> + <listitem> + <synopsis>int (*dirty)(struct drm_framebuffer *framebuffer, + struct drm_file *file_priv, unsigned flags, unsigned color, + struct drm_clip_rect *clips, unsigned num_clips);</synopsis> + <para> + This optional operation notifies the driver that a region of the + frame buffer has changed in response to a DRM_IOCTL_MODE_DIRTYFB + ioctl call. + </para> + </listitem> + </itemizedlist> + </para> + <para> + The lifetime of a drm framebuffer is controlled with a reference count, + drivers can grab additional references with + <function>drm_framebuffer_reference</function>and drop them + again with <function>drm_framebuffer_unreference</function>. For + driver-private framebuffers for which the last reference is never + dropped (e.g. for the fbdev framebuffer when the struct + <structname>drm_framebuffer</structname> is embedded into the fbdev + helper struct) drivers can manually clean up a framebuffer at module + unload time with + <function>drm_framebuffer_unregister_private</function>. + </para> + </sect2> + <sect2> + <title>Dumb Buffer Objects</title> + <para> + The KMS API doesn't standardize backing storage object creation and + leaves it to driver-specific ioctls. Furthermore actually creating a + buffer object even for GEM-based drivers is done through a + driver-specific ioctl - GEM only has a common userspace interface for + sharing and destroying objects. While not an issue for full-fledged + graphics stacks that include device-specific userspace components (in + libdrm for instance), this limit makes DRM-based early boot graphics + unnecessarily complex. + </para> + <para> + Dumb objects partly alleviate the problem by providing a standard + API to create dumb buffers suitable for scanout, which can then be used + to create KMS frame buffers. + </para> + <para> + To support dumb objects drivers must implement the + <methodname>dumb_create</methodname>, + <methodname>dumb_destroy</methodname> and + <methodname>dumb_map_offset</methodname> operations. + </para> + <itemizedlist> + <listitem> + <synopsis>int (*dumb_create)(struct drm_file *file_priv, struct drm_device *dev, + struct drm_mode_create_dumb *args);</synopsis> + <para> + The <methodname>dumb_create</methodname> operation creates a driver + object (GEM or TTM handle) suitable for scanout based on the + width, height and depth from the struct + <structname>drm_mode_create_dumb</structname> argument. It fills the + argument's <structfield>handle</structfield>, + <structfield>pitch</structfield> and <structfield>size</structfield> + fields with a handle for the newly created object and its line + pitch and size in bytes. + </para> + </listitem> + <listitem> + <synopsis>int (*dumb_destroy)(struct drm_file *file_priv, struct drm_device *dev, + uint32_t handle);</synopsis> + <para> + The <methodname>dumb_destroy</methodname> operation destroys a dumb + object created by <methodname>dumb_create</methodname>. + </para> + </listitem> + <listitem> + <synopsis>int (*dumb_map_offset)(struct drm_file *file_priv, struct drm_device *dev, + uint32_t handle, uint64_t *offset);</synopsis> + <para> + The <methodname>dumb_map_offset</methodname> operation associates an + mmap fake offset with the object given by the handle and returns + it. Drivers must use the + <function>drm_gem_create_mmap_offset</function> function to + associate the fake offset as described in + <xref linkend="drm-gem-objects-mapping"/>. + </para> + </listitem> + </itemizedlist> + <para> + Note that dumb objects may not be used for gpu acceleration, as has been + attempted on some ARM embedded platforms. Such drivers really must have + a hardware-specific ioctl to allocate suitable buffer objects. + </para> + </sect2> + <sect2> + <title>Output Polling</title> + <synopsis>void (*output_poll_changed)(struct drm_device *dev);</synopsis> + <para> + This operation notifies the driver that the status of one or more + connectors has changed. Drivers that use the fb helper can just call the + <function>drm_fb_helper_hotplug_event</function> function to handle this + operation. + </para> + </sect2> + <sect2> + <title>Locking</title> + <para> + Beside some lookup structures with their own locking (which is hidden + behind the interface functions) most of the modeset state is protected + by the <code>dev-<mode_config.lock</code> mutex and additionally + per-crtc locks to allow cursor updates, pageflips and similar operations + to occur concurrently with background tasks like output detection. + Operations which cross domains like a full modeset always grab all + locks. Drivers there need to protect resources shared between crtcs with + additional locking. They also need to be careful to always grab the + relevant crtc locks if a modset functions touches crtc state, e.g. for + load detection (which does only grab the <code>mode_config.lock</code> + to allow concurrent screen updates on live crtcs). + </para> + </sect2> + </sect1> + + <!-- Internals: kms initialization and cleanup --> + + <sect1 id="drm-kms-init"> + <title>KMS Initialization and Cleanup</title> + <para> + A KMS device is abstracted and exposed as a set of planes, CRTCs, encoders + and connectors. KMS drivers must thus create and initialize all those + objects at load time after initializing mode setting. + </para> + <sect2> + <title>CRTCs (struct <structname>drm_crtc</structname>)</title> + <para> + A CRTC is an abstraction representing a part of the chip that contains a + pointer to a scanout buffer. Therefore, the number of CRTCs available + determines how many independent scanout buffers can be active at any + given time. The CRTC structure contains several fields to support this: + a pointer to some video memory (abstracted as a frame buffer object), a + display mode, and an (x, y) offset into the video memory to support + panning or configurations where one piece of video memory spans multiple + CRTCs. + </para> + <sect3> + <title>CRTC Initialization</title> + <para> + A KMS device must create and register at least one struct + <structname>drm_crtc</structname> instance. The instance is allocated + and zeroed by the driver, possibly as part of a larger structure, and + registered with a call to <function>drm_crtc_init</function> with a + pointer to CRTC functions. + </para> + </sect3> + <sect3 id="drm-kms-crtcops"> + <title>CRTC Operations</title> + <sect4> + <title>Set Configuration</title> + <synopsis>int (*set_config)(struct drm_mode_set *set);</synopsis> + <para> + Apply a new CRTC configuration to the device. The configuration + specifies a CRTC, a frame buffer to scan out from, a (x,y) position in + the frame buffer, a display mode and an array of connectors to drive + with the CRTC if possible. + </para> + <para> + If the frame buffer specified in the configuration is NULL, the driver + must detach all encoders connected to the CRTC and all connectors + attached to those encoders and disable them. + </para> + <para> + This operation is called with the mode config lock held. + </para> + <note><para> + Note that the drm core has no notion of restoring the mode setting + state after resume, since all resume handling is in the full + responsibility of the driver. The common mode setting helper library + though provides a helper which can be used for this: + <function>drm_helper_resume_force_mode</function>. + </para></note> + </sect4> + <sect4> + <title>Page Flipping</title> + <synopsis>int (*page_flip)(struct drm_crtc *crtc, struct drm_framebuffer *fb, + struct drm_pending_vblank_event *event);</synopsis> + <para> + Schedule a page flip to the given frame buffer for the CRTC. This + operation is called with the mode config mutex held. + </para> + <para> + Page flipping is a synchronization mechanism that replaces the frame + buffer being scanned out by the CRTC with a new frame buffer during + vertical blanking, avoiding tearing. When an application requests a page + flip the DRM core verifies that the new frame buffer is large enough to + be scanned out by the CRTC in the currently configured mode and then + calls the CRTC <methodname>page_flip</methodname> operation with a + pointer to the new frame buffer. + </para> + <para> + The <methodname>page_flip</methodname> operation schedules a page flip. + Once any pending rendering targeting the new frame buffer has + completed, the CRTC will be reprogrammed to display that frame buffer + after the next vertical refresh. The operation must return immediately + without waiting for rendering or page flip to complete and must block + any new rendering to the frame buffer until the page flip completes. + </para> + <para> + If a page flip can be successfully scheduled the driver must set the + <code>drm_crtc-<fb</code> field to the new framebuffer pointed to + by <code>fb</code>. This is important so that the reference counting + on framebuffers stays balanced. + </para> + <para> + If a page flip is already pending, the + <methodname>page_flip</methodname> operation must return + -<errorname>EBUSY</errorname>. + </para> + <para> + To synchronize page flip to vertical blanking the driver will likely + need to enable vertical blanking interrupts. It should call + <function>drm_vblank_get</function> for that purpose, and call + <function>drm_vblank_put</function> after the page flip completes. + </para> + <para> + If the application has requested to be notified when page flip completes + the <methodname>page_flip</methodname> operation will be called with a + non-NULL <parameter>event</parameter> argument pointing to a + <structname>drm_pending_vblank_event</structname> instance. Upon page + flip completion the driver must call <methodname>drm_send_vblank_event</methodname> + to fill in the event and send to wake up any waiting processes. + This can be performed with + <programlisting><![CDATA[ + spin_lock_irqsave(&dev->event_lock, flags); + ... + drm_send_vblank_event(dev, pipe, event); + spin_unlock_irqrestore(&dev->event_lock, flags); + ]]></programlisting> + </para> + <note><para> + FIXME: Could drivers that don't need to wait for rendering to complete + just add the event to <literal>dev->vblank_event_list</literal> and + let the DRM core handle everything, as for "normal" vertical blanking + events? + </para></note> + <para> + While waiting for the page flip to complete, the + <literal>event->base.link</literal> list head can be used freely by + the driver to store the pending event in a driver-specific list. + </para> + <para> + If the file handle is closed before the event is signaled, drivers must + take care to destroy the event in their + <methodname>preclose</methodname> operation (and, if needed, call + <function>drm_vblank_put</function>). + </para> + </sect4> + <sect4> + <title>Miscellaneous</title> + <itemizedlist> + <listitem> + <synopsis>void (*set_property)(struct drm_crtc *crtc, + struct drm_property *property, uint64_t value);</synopsis> + <para> + Set the value of the given CRTC property to + <parameter>value</parameter>. See <xref linkend="drm-kms-properties"/> + for more information about properties. + </para> + </listitem> + <listitem> + <synopsis>void (*gamma_set)(struct drm_crtc *crtc, u16 *r, u16 *g, u16 *b, + uint32_t start, uint32_t size);</synopsis> + <para> + Apply a gamma table to the device. The operation is optional. + </para> + </listitem> + <listitem> + <synopsis>void (*destroy)(struct drm_crtc *crtc);</synopsis> + <para> + Destroy the CRTC when not needed anymore. See + <xref linkend="drm-kms-init"/>. + </para> + </listitem> + </itemizedlist> + </sect4> + </sect3> + </sect2> + <sect2> + <title>Planes (struct <structname>drm_plane</structname>)</title> + <para> + A plane represents an image source that can be blended with or overlayed + on top of a CRTC during the scanout process. Planes are associated with + a frame buffer to crop a portion of the image memory (source) and + optionally scale it to a destination size. The result is then blended + with or overlayed on top of a CRTC. + </para> + <para> + The DRM core recognizes three types of planes: + <itemizedlist> + <listitem> + DRM_PLANE_TYPE_PRIMARY represents a "main" plane for a CRTC. Primary + planes are the planes operated upon by by CRTC modesetting and flipping + operations described in <xref linkend="drm-kms-crtcops"/>. + </listitem> + <listitem> + DRM_PLANE_TYPE_CURSOR represents a "cursor" plane for a CRTC. Cursor + planes are the planes operated upon by the DRM_IOCTL_MODE_CURSOR and + DRM_IOCTL_MODE_CURSOR2 ioctls. + </listitem> + <listitem> + DRM_PLANE_TYPE_OVERLAY represents all non-primary, non-cursor planes. + Some drivers refer to these types of planes as "sprites" internally. + </listitem> + </itemizedlist> + For compatibility with legacy userspace, only overlay planes are made + available to userspace by default. Userspace clients may set the + DRM_CLIENT_CAP_UNIVERSAL_PLANES client capability bit to indicate that + they wish to receive a universal plane list containing all plane types. + </para> + <sect3> + <title>Plane Initialization</title> + <para> + To create a plane, a KMS drivers allocates and + zeroes an instances of struct <structname>drm_plane</structname> + (possibly as part of a larger structure) and registers it with a call + to <function>drm_universal_plane_init</function>. The function takes a bitmask + of the CRTCs that can be associated with the plane, a pointer to the + plane functions, a list of format supported formats, and the type of + plane (primary, cursor, or overlay) being initialized. + </para> + <para> + Cursor and overlay planes are optional. All drivers should provide + one primary plane per CRTC (although this requirement may change in + the future); drivers that do not wish to provide special handling for + primary planes may make use of the helper functions described in + <xref linkend="drm-kms-planehelpers"/> to create and register a + primary plane with standard capabilities. + </para> + </sect3> + <sect3> + <title>Plane Operations</title> + <itemizedlist> + <listitem> + <synopsis>int (*update_plane)(struct drm_plane *plane, struct drm_crtc *crtc, + struct drm_framebuffer *fb, int crtc_x, int crtc_y, + unsigned int crtc_w, unsigned int crtc_h, + uint32_t src_x, uint32_t src_y, + uint32_t src_w, uint32_t src_h);</synopsis> + <para> + Enable and configure the plane to use the given CRTC and frame buffer. + </para> + <para> + The source rectangle in frame buffer memory coordinates is given by + the <parameter>src_x</parameter>, <parameter>src_y</parameter>, + <parameter>src_w</parameter> and <parameter>src_h</parameter> + parameters (as 16.16 fixed point values). Devices that don't support + subpixel plane coordinates can ignore the fractional part. + </para> + <para> + The destination rectangle in CRTC coordinates is given by the + <parameter>crtc_x</parameter>, <parameter>crtc_y</parameter>, + <parameter>crtc_w</parameter> and <parameter>crtc_h</parameter> + parameters (as integer values). Devices scale the source rectangle to + the destination rectangle. If scaling is not supported, and the source + rectangle size doesn't match the destination rectangle size, the + driver must return a -<errorname>EINVAL</errorname> error. + </para> + </listitem> + <listitem> + <synopsis>int (*disable_plane)(struct drm_plane *plane);</synopsis> + <para> + Disable the plane. The DRM core calls this method in response to a + DRM_IOCTL_MODE_SETPLANE ioctl call with the frame buffer ID set to 0. + Disabled planes must not be processed by the CRTC. + </para> + </listitem> + <listitem> + <synopsis>void (*destroy)(struct drm_plane *plane);</synopsis> + <para> + Destroy the plane when not needed anymore. See + <xref linkend="drm-kms-init"/>. + </para> + </listitem> + </itemizedlist> + </sect3> + </sect2> + <sect2> + <title>Encoders (struct <structname>drm_encoder</structname>)</title> + <para> + An encoder takes pixel data from a CRTC and converts it to a format + suitable for any attached connectors. On some devices, it may be + possible to have a CRTC send data to more than one encoder. In that + case, both encoders would receive data from the same scanout buffer, + resulting in a "cloned" display configuration across the connectors + attached to each encoder. + </para> + <sect3> + <title>Encoder Initialization</title> + <para> + As for CRTCs, a KMS driver must create, initialize and register at + least one struct <structname>drm_encoder</structname> instance. The + instance is allocated and zeroed by the driver, possibly as part of a + larger structure. + </para> + <para> + Drivers must initialize the struct <structname>drm_encoder</structname> + <structfield>possible_crtcs</structfield> and + <structfield>possible_clones</structfield> fields before registering the + encoder. Both fields are bitmasks of respectively the CRTCs that the + encoder can be connected to, and sibling encoders candidate for cloning. + </para> + <para> + After being initialized, the encoder must be registered with a call to + <function>drm_encoder_init</function>. The function takes a pointer to + the encoder functions and an encoder type. Supported types are + <itemizedlist> + <listitem> + DRM_MODE_ENCODER_DAC for VGA and analog on DVI-I/DVI-A + </listitem> + <listitem> + DRM_MODE_ENCODER_TMDS for DVI, HDMI and (embedded) DisplayPort + </listitem> + <listitem> + DRM_MODE_ENCODER_LVDS for display panels + </listitem> + <listitem> + DRM_MODE_ENCODER_TVDAC for TV output (Composite, S-Video, Component, + SCART) + </listitem> + <listitem> + DRM_MODE_ENCODER_VIRTUAL for virtual machine displays + </listitem> + </itemizedlist> + </para> + <para> + Encoders must be attached to a CRTC to be used. DRM drivers leave + encoders unattached at initialization time. Applications (or the fbdev + compatibility layer when implemented) are responsible for attaching the + encoders they want to use to a CRTC. + </para> + </sect3> + <sect3> + <title>Encoder Operations</title> + <itemizedlist> + <listitem> + <synopsis>void (*destroy)(struct drm_encoder *encoder);</synopsis> + <para> + Called to destroy the encoder when not needed anymore. See + <xref linkend="drm-kms-init"/>. + </para> + </listitem> + <listitem> + <synopsis>void (*set_property)(struct drm_plane *plane, + struct drm_property *property, uint64_t value);</synopsis> + <para> + Set the value of the given plane property to + <parameter>value</parameter>. See <xref linkend="drm-kms-properties"/> + for more information about properties. + </para> + </listitem> + </itemizedlist> + </sect3> + </sect2> + <sect2> + <title>Connectors (struct <structname>drm_connector</structname>)</title> + <para> + A connector is the final destination for pixel data on a device, and + usually connects directly to an external display device like a monitor + or laptop panel. A connector can only be attached to one encoder at a + time. The connector is also the structure where information about the + attached display is kept, so it contains fields for display data, EDID + data, DPMS & connection status, and information about modes + supported on the attached displays. + </para> + <sect3> + <title>Connector Initialization</title> + <para> + Finally a KMS driver must create, initialize, register and attach at + least one struct <structname>drm_connector</structname> instance. The + instance is created as other KMS objects and initialized by setting the + following fields. + </para> + <variablelist> + <varlistentry> + <term><structfield>interlace_allowed</structfield></term> + <listitem><para> + Whether the connector can handle interlaced modes. + </para></listitem> + </varlistentry> + <varlistentry> + <term><structfield>doublescan_allowed</structfield></term> + <listitem><para> + Whether the connector can handle doublescan. + </para></listitem> + </varlistentry> + <varlistentry> + <term><structfield>display_info + </structfield></term> + <listitem><para> + Display information is filled from EDID information when a display + is detected. For non hot-pluggable displays such as flat panels in + embedded systems, the driver should initialize the + <structfield>display_info</structfield>.<structfield>width_mm</structfield> + and + <structfield>display_info</structfield>.<structfield>height_mm</structfield> + fields with the physical size of the display. + </para></listitem> + </varlistentry> + <varlistentry> + <term id="drm-kms-connector-polled"><structfield>polled</structfield></term> + <listitem><para> + Connector polling mode, a combination of + <variablelist> + <varlistentry> + <term>DRM_CONNECTOR_POLL_HPD</term> + <listitem><para> + The connector generates hotplug events and doesn't need to be + periodically polled. The CONNECT and DISCONNECT flags must not + be set together with the HPD flag. + </para></listitem> + </varlistentry> + <varlistentry> + <term>DRM_CONNECTOR_POLL_CONNECT</term> + <listitem><para> + Periodically poll the connector for connection. + </para></listitem> + </varlistentry> + <varlistentry> + <term>DRM_CONNECTOR_POLL_DISCONNECT</term> + <listitem><para> + Periodically poll the connector for disconnection. + </para></listitem> + </varlistentry> + </variablelist> + Set to 0 for connectors that don't support connection status + discovery. + </para></listitem> + </varlistentry> + </variablelist> + <para> + The connector is then registered with a call to + <function>drm_connector_init</function> with a pointer to the connector + functions and a connector type, and exposed through sysfs with a call to + <function>drm_sysfs_connector_add</function>. + </para> + <para> + Supported connector types are + <itemizedlist> + <listitem>DRM_MODE_CONNECTOR_VGA</listitem> + <listitem>DRM_MODE_CONNECTOR_DVII</listitem> + <listitem>DRM_MODE_CONNECTOR_DVID</listitem> + <listitem>DRM_MODE_CONNECTOR_DVIA</listitem> + <listitem>DRM_MODE_CONNECTOR_Composite</listitem> + <listitem>DRM_MODE_CONNECTOR_SVIDEO</listitem> + <listitem>DRM_MODE_CONNECTOR_LVDS</listitem> + <listitem>DRM_MODE_CONNECTOR_Component</listitem> + <listitem>DRM_MODE_CONNECTOR_9PinDIN</listitem> + <listitem>DRM_MODE_CONNECTOR_DisplayPort</listitem> + <listitem>DRM_MODE_CONNECTOR_HDMIA</listitem> + <listitem>DRM_MODE_CONNECTOR_HDMIB</listitem> + <listitem>DRM_MODE_CONNECTOR_TV</listitem> + <listitem>DRM_MODE_CONNECTOR_eDP</listitem> + <listitem>DRM_MODE_CONNECTOR_VIRTUAL</listitem> + </itemizedlist> + </para> + <para> + Connectors must be attached to an encoder to be used. For devices that + map connectors to encoders 1:1, the connector should be attached at + initialization time with a call to + <function>drm_mode_connector_attach_encoder</function>. The driver must + also set the <structname>drm_connector</structname> + <structfield>encoder</structfield> field to point to the attached + encoder. + </para> + <para> + Finally, drivers must initialize the connectors state change detection + with a call to <function>drm_kms_helper_poll_init</function>. If at + least one connector is pollable but can't generate hotplug interrupts + (indicated by the DRM_CONNECTOR_POLL_CONNECT and + DRM_CONNECTOR_POLL_DISCONNECT connector flags), a delayed work will + automatically be queued to periodically poll for changes. Connectors + that can generate hotplug interrupts must be marked with the + DRM_CONNECTOR_POLL_HPD flag instead, and their interrupt handler must + call <function>drm_helper_hpd_irq_event</function>. The function will + queue a delayed work to check the state of all connectors, but no + periodic polling will be done. + </para> + </sect3> + <sect3> + <title>Connector Operations</title> + <note><para> + Unless otherwise state, all operations are mandatory. + </para></note> + <sect4> + <title>DPMS</title> + <synopsis>void (*dpms)(struct drm_connector *connector, int mode);</synopsis> + <para> + The DPMS operation sets the power state of a connector. The mode + argument is one of + <itemizedlist> + <listitem><para>DRM_MODE_DPMS_ON</para></listitem> + <listitem><para>DRM_MODE_DPMS_STANDBY</para></listitem> + <listitem><para>DRM_MODE_DPMS_SUSPEND</para></listitem> + <listitem><para>DRM_MODE_DPMS_OFF</para></listitem> + </itemizedlist> + </para> + <para> + In all but DPMS_ON mode the encoder to which the connector is attached + should put the display in low-power mode by driving its signals + appropriately. If more than one connector is attached to the encoder + care should be taken not to change the power state of other displays as + a side effect. Low-power mode should be propagated to the encoders and + CRTCs when all related connectors are put in low-power mode. + </para> + </sect4> + <sect4> + <title>Modes</title> + <synopsis>int (*fill_modes)(struct drm_connector *connector, uint32_t max_width, + uint32_t max_height);</synopsis> + <para> + Fill the mode list with all supported modes for the connector. If the + <parameter>max_width</parameter> and <parameter>max_height</parameter> + arguments are non-zero, the implementation must ignore all modes wider + than <parameter>max_width</parameter> or higher than + <parameter>max_height</parameter>. + </para> + <para> + The connector must also fill in this operation its + <structfield>display_info</structfield> + <structfield>width_mm</structfield> and + <structfield>height_mm</structfield> fields with the connected display + physical size in millimeters. The fields should be set to 0 if the value + isn't known or is not applicable (for instance for projector devices). + </para> + </sect4> + <sect4> + <title>Connection Status</title> + <para> + The connection status is updated through polling or hotplug events when + supported (see <xref linkend="drm-kms-connector-polled"/>). The status + value is reported to userspace through ioctls and must not be used + inside the driver, as it only gets initialized by a call to + <function>drm_mode_getconnector</function> from userspace. + </para> + <synopsis>enum drm_connector_status (*detect)(struct drm_connector *connector, + bool force);</synopsis> + <para> + Check to see if anything is attached to the connector. The + <parameter>force</parameter> parameter is set to false whilst polling or + to true when checking the connector due to user request. + <parameter>force</parameter> can be used by the driver to avoid + expensive, destructive operations during automated probing. + </para> + <para> + Return connector_status_connected if something is connected to the + connector, connector_status_disconnected if nothing is connected and + connector_status_unknown if the connection state isn't known. + </para> + <para> + Drivers should only return connector_status_connected if the connection + status has really been probed as connected. Connectors that can't detect + the connection status, or failed connection status probes, should return + connector_status_unknown. + </para> + </sect4> + <sect4> + <title>Miscellaneous</title> + <itemizedlist> + <listitem> + <synopsis>void (*set_property)(struct drm_connector *connector, + struct drm_property *property, uint64_t value);</synopsis> + <para> + Set the value of the given connector property to + <parameter>value</parameter>. See <xref linkend="drm-kms-properties"/> + for more information about properties. + </para> + </listitem> + <listitem> + <synopsis>void (*destroy)(struct drm_connector *connector);</synopsis> + <para> + Destroy the connector when not needed anymore. See + <xref linkend="drm-kms-init"/>. + </para> + </listitem> + </itemizedlist> + </sect4> + </sect3> + </sect2> + <sect2> + <title>Cleanup</title> + <para> + The DRM core manages its objects' lifetime. When an object is not needed + anymore the core calls its destroy function, which must clean up and + free every resource allocated for the object. Every + <function>drm_*_init</function> call must be matched with a + corresponding <function>drm_*_cleanup</function> call to cleanup CRTCs + (<function>drm_crtc_cleanup</function>), planes + (<function>drm_plane_cleanup</function>), encoders + (<function>drm_encoder_cleanup</function>) and connectors + (<function>drm_connector_cleanup</function>). Furthermore, connectors + that have been added to sysfs must be removed by a call to + <function>drm_sysfs_connector_remove</function> before calling + <function>drm_connector_cleanup</function>. + </para> + <para> + Connectors state change detection must be cleanup up with a call to + <function>drm_kms_helper_poll_fini</function>. + </para> + </sect2> + <sect2> + <title>Output discovery and initialization example</title> + <programlisting><![CDATA[ +void intel_crt_init(struct drm_device *dev) +{ + struct drm_connector *connector; + struct intel_output *intel_output; + + intel_output = kzalloc(sizeof(struct intel_output), GFP_KERNEL); + if (!intel_output) + return; + + connector = &intel_output->base; + drm_connector_init(dev, &intel_output->base, + &intel_crt_connector_funcs, DRM_MODE_CONNECTOR_VGA); + + drm_encoder_init(dev, &intel_output->enc, &intel_crt_enc_funcs, + DRM_MODE_ENCODER_DAC); + + drm_mode_connector_attach_encoder(&intel_output->base, + &intel_output->enc); + + /* Set up the DDC bus. */ + intel_output->ddc_bus = intel_i2c_create(dev, GPIOA, "CRTDDC_A"); + if (!intel_output->ddc_bus) { + dev_printk(KERN_ERR, &dev->pdev->dev, "DDC bus registration " + "failed.\n"); + return; + } + + intel_output->type = INTEL_OUTPUT_ANALOG; + connector->interlace_allowed = 0; + connector->doublescan_allowed = 0; + + drm_encoder_helper_add(&intel_output->enc, &intel_crt_helper_funcs); + drm_connector_helper_add(connector, &intel_crt_connector_helper_funcs); + + drm_sysfs_connector_add(connector); +}]]></programlisting> + <para> + In the example above (taken from the i915 driver), a CRTC, connector and + encoder combination is created. A device-specific i2c bus is also + created for fetching EDID data and performing monitor detection. Once + the process is complete, the new connector is registered with sysfs to + make its properties available to applications. + </para> + </sect2> + <sect2> + <title>KMS API Functions</title> +!Edrivers/gpu/drm/drm_crtc.c + </sect2> + <sect2> + <title>KMS Locking</title> +!Pdrivers/gpu/drm/drm_modeset_lock.c kms locking +!Iinclude/drm/drm_modeset_lock.h +!Edrivers/gpu/drm/drm_modeset_lock.c + </sect2> + </sect1> + + <!-- Internals: kms helper functions --> + + <sect1> + <title>Mode Setting Helper Functions</title> + <para> + The plane, CRTC, encoder and connector functions provided by the drivers + implement the DRM API. They're called by the DRM core and ioctl handlers + to handle device state changes and configuration request. As implementing + those functions often requires logic not specific to drivers, mid-layer + helper functions are available to avoid duplicating boilerplate code. + </para> + <para> + The DRM core contains one mid-layer implementation. The mid-layer provides + implementations of several plane, CRTC, encoder and connector functions + (called from the top of the mid-layer) that pre-process requests and call + lower-level functions provided by the driver (at the bottom of the + mid-layer). For instance, the + <function>drm_crtc_helper_set_config</function> function can be used to + fill the struct <structname>drm_crtc_funcs</structname> + <structfield>set_config</structfield> field. When called, it will split + the <methodname>set_config</methodname> operation in smaller, simpler + operations and call the driver to handle them. + </para> + <para> + To use the mid-layer, drivers call <function>drm_crtc_helper_add</function>, + <function>drm_encoder_helper_add</function> and + <function>drm_connector_helper_add</function> functions to install their + mid-layer bottom operations handlers, and fill the + <structname>drm_crtc_funcs</structname>, + <structname>drm_encoder_funcs</structname> and + <structname>drm_connector_funcs</structname> structures with pointers to + the mid-layer top API functions. Installing the mid-layer bottom operation + handlers is best done right after registering the corresponding KMS object. + </para> + <para> + The mid-layer is not split between CRTC, encoder and connector operations. + To use it, a driver must provide bottom functions for all of the three KMS + entities. + </para> + <sect2> + <title>Helper Functions</title> + <itemizedlist> + <listitem> + <synopsis>int drm_crtc_helper_set_config(struct drm_mode_set *set);</synopsis> + <para> + The <function>drm_crtc_helper_set_config</function> helper function + is a CRTC <methodname>set_config</methodname> implementation. It + first tries to locate the best encoder for each connector by calling + the connector <methodname>best_encoder</methodname> helper + operation. + </para> + <para> + After locating the appropriate encoders, the helper function will + call the <methodname>mode_fixup</methodname> encoder and CRTC helper + operations to adjust the requested mode, or reject it completely in + which case an error will be returned to the application. If the new + configuration after mode adjustment is identical to the current + configuration the helper function will return without performing any + other operation. + </para> + <para> + If the adjusted mode is identical to the current mode but changes to + the frame buffer need to be applied, the + <function>drm_crtc_helper_set_config</function> function will call + the CRTC <methodname>mode_set_base</methodname> helper operation. If + the adjusted mode differs from the current mode, or if the + <methodname>mode_set_base</methodname> helper operation is not + provided, the helper function performs a full mode set sequence by + calling the <methodname>prepare</methodname>, + <methodname>mode_set</methodname> and + <methodname>commit</methodname> CRTC and encoder helper operations, + in that order. + </para> + </listitem> + <listitem> + <synopsis>void drm_helper_connector_dpms(struct drm_connector *connector, int mode);</synopsis> + <para> + The <function>drm_helper_connector_dpms</function> helper function + is a connector <methodname>dpms</methodname> implementation that + tracks power state of connectors. To use the function, drivers must + provide <methodname>dpms</methodname> helper operations for CRTCs + and encoders to apply the DPMS state to the device. + </para> + <para> + The mid-layer doesn't track the power state of CRTCs and encoders. + The <methodname>dpms</methodname> helper operations can thus be + called with a mode identical to the currently active mode. + </para> + </listitem> + <listitem> + <synopsis>int drm_helper_probe_single_connector_modes(struct drm_connector *connector, + uint32_t maxX, uint32_t maxY);</synopsis> + <para> + The <function>drm_helper_probe_single_connector_modes</function> helper + function is a connector <methodname>fill_modes</methodname> + implementation that updates the connection status for the connector + and then retrieves a list of modes by calling the connector + <methodname>get_modes</methodname> helper operation. + </para> + <para> + The function filters out modes larger than + <parameter>max_width</parameter> and <parameter>max_height</parameter> + if specified. It then calls the optional connector + <methodname>mode_valid</methodname> helper operation for each mode in + the probed list to check whether the mode is valid for the connector. + </para> + </listitem> + </itemizedlist> + </sect2> + <sect2> + <title>CRTC Helper Operations</title> + <itemizedlist> + <listitem id="drm-helper-crtc-mode-fixup"> + <synopsis>bool (*mode_fixup)(struct drm_crtc *crtc, + const struct drm_display_mode *mode, + struct drm_display_mode *adjusted_mode);</synopsis> + <para> + Let CRTCs adjust the requested mode or reject it completely. This + operation returns true if the mode is accepted (possibly after being + adjusted) or false if it is rejected. + </para> + <para> + The <methodname>mode_fixup</methodname> operation should reject the + mode if it can't reasonably use it. The definition of "reasonable" + is currently fuzzy in this context. One possible behaviour would be + to set the adjusted mode to the panel timings when a fixed-mode + panel is used with hardware capable of scaling. Another behaviour + would be to accept any input mode and adjust it to the closest mode + supported by the hardware (FIXME: This needs to be clarified). + </para> + </listitem> + <listitem> + <synopsis>int (*mode_set_base)(struct drm_crtc *crtc, int x, int y, + struct drm_framebuffer *old_fb)</synopsis> + <para> + Move the CRTC on the current frame buffer (stored in + <literal>crtc->fb</literal>) to position (x,y). Any of the frame + buffer, x position or y position may have been modified. + </para> + <para> + This helper operation is optional. If not provided, the + <function>drm_crtc_helper_set_config</function> function will fall + back to the <methodname>mode_set</methodname> helper operation. + </para> + <note><para> + FIXME: Why are x and y passed as arguments, as they can be accessed + through <literal>crtc->x</literal> and + <literal>crtc->y</literal>? + </para></note> + </listitem> + <listitem> + <synopsis>void (*prepare)(struct drm_crtc *crtc);</synopsis> + <para> + Prepare the CRTC for mode setting. This operation is called after + validating the requested mode. Drivers use it to perform + device-specific operations required before setting the new mode. + </para> + </listitem> + <listitem> + <synopsis>int (*mode_set)(struct drm_crtc *crtc, struct drm_display_mode *mode, + struct drm_display_mode *adjusted_mode, int x, int y, + struct drm_framebuffer *old_fb);</synopsis> + <para> + Set a new mode, position and frame buffer. Depending on the device + requirements, the mode can be stored internally by the driver and + applied in the <methodname>commit</methodname> operation, or + programmed to the hardware immediately. + </para> + <para> + The <methodname>mode_set</methodname> operation returns 0 on success + or a negative error code if an error occurs. + </para> + </listitem> + <listitem> + <synopsis>void (*commit)(struct drm_crtc *crtc);</synopsis> + <para> + Commit a mode. This operation is called after setting the new mode. + Upon return the device must use the new mode and be fully + operational. + </para> + </listitem> + </itemizedlist> + </sect2> + <sect2> + <title>Encoder Helper Operations</title> + <itemizedlist> + <listitem> + <synopsis>bool (*mode_fixup)(struct drm_encoder *encoder, + const struct drm_display_mode *mode, + struct drm_display_mode *adjusted_mode);</synopsis> + <para> + Let encoders adjust the requested mode or reject it completely. This + operation returns true if the mode is accepted (possibly after being + adjusted) or false if it is rejected. See the + <link linkend="drm-helper-crtc-mode-fixup">mode_fixup CRTC helper + operation</link> for an explanation of the allowed adjustments. + </para> + </listitem> + <listitem> + <synopsis>void (*prepare)(struct drm_encoder *encoder);</synopsis> + <para> + Prepare the encoder for mode setting. This operation is called after + validating the requested mode. Drivers use it to perform + device-specific operations required before setting the new mode. + </para> + </listitem> + <listitem> + <synopsis>void (*mode_set)(struct drm_encoder *encoder, + struct drm_display_mode *mode, + struct drm_display_mode *adjusted_mode);</synopsis> + <para> + Set a new mode. Depending on the device requirements, the mode can + be stored internally by the driver and applied in the + <methodname>commit</methodname> operation, or programmed to the + hardware immediately. + </para> + </listitem> + <listitem> + <synopsis>void (*commit)(struct drm_encoder *encoder);</synopsis> + <para> + Commit a mode. This operation is called after setting the new mode. + Upon return the device must use the new mode and be fully + operational. + </para> + </listitem> + </itemizedlist> + </sect2> + <sect2> + <title>Connector Helper Operations</title> + <itemizedlist> + <listitem> + <synopsis>struct drm_encoder *(*best_encoder)(struct drm_connector *connector);</synopsis> + <para> + Return a pointer to the best encoder for the connecter. Device that + map connectors to encoders 1:1 simply return the pointer to the + associated encoder. This operation is mandatory. + </para> + </listitem> + <listitem> + <synopsis>int (*get_modes)(struct drm_connector *connector);</synopsis> + <para> + Fill the connector's <structfield>probed_modes</structfield> list + by parsing EDID data with <function>drm_add_edid_modes</function> or + calling <function>drm_mode_probed_add</function> directly for every + supported mode and return the number of modes it has detected. This + operation is mandatory. + </para> + <para> + When adding modes manually the driver creates each mode with a call to + <function>drm_mode_create</function> and must fill the following fields. + <itemizedlist> + <listitem> + <synopsis>__u32 type;</synopsis> + <para> + Mode type bitmask, a combination of + <variablelist> + <varlistentry> + <term>DRM_MODE_TYPE_BUILTIN</term> + <listitem><para>not used?</para></listitem> + </varlistentry> + <varlistentry> + <term>DRM_MODE_TYPE_CLOCK_C</term> + <listitem><para>not used?</para></listitem> + </varlistentry> + <varlistentry> + <term>DRM_MODE_TYPE_CRTC_C</term> + <listitem><para>not used?</para></listitem> + </varlistentry> + <varlistentry> + <term> + DRM_MODE_TYPE_PREFERRED - The preferred mode for the connector + </term> + <listitem> + <para>not used?</para> + </listitem> + </varlistentry> + <varlistentry> + <term>DRM_MODE_TYPE_DEFAULT</term> + <listitem><para>not used?</para></listitem> + </varlistentry> + <varlistentry> + <term>DRM_MODE_TYPE_USERDEF</term> + <listitem><para>not used?</para></listitem> + </varlistentry> + <varlistentry> + <term>DRM_MODE_TYPE_DRIVER</term> + <listitem> + <para> + The mode has been created by the driver (as opposed to + to user-created modes). + </para> + </listitem> + </varlistentry> + </variablelist> + Drivers must set the DRM_MODE_TYPE_DRIVER bit for all modes they + create, and set the DRM_MODE_TYPE_PREFERRED bit for the preferred + mode. + </para> + </listitem> + <listitem> + <synopsis>__u32 clock;</synopsis> + <para>Pixel clock frequency in kHz unit</para> + </listitem> + <listitem> + <synopsis>__u16 hdisplay, hsync_start, hsync_end, htotal; + __u16 vdisplay, vsync_start, vsync_end, vtotal;</synopsis> + <para>Horizontal and vertical timing information</para> + <screen><![CDATA[ + Active Front Sync Back + Region Porch Porch + <-----------------------><----------------><-------------><--------------> + + //////////////////////| + ////////////////////// | + ////////////////////// |.................. ................ + _______________ + + <----- [hv]display -----> + <------------- [hv]sync_start ------------> + <--------------------- [hv]sync_end ---------------------> + <-------------------------------- [hv]total -----------------------------> +]]></screen> + </listitem> + <listitem> + <synopsis>__u16 hskew; + __u16 vscan;</synopsis> + <para>Unknown</para> + </listitem> + <listitem> + <synopsis>__u32 flags;</synopsis> + <para> + Mode flags, a combination of + <variablelist> + <varlistentry> + <term>DRM_MODE_FLAG_PHSYNC</term> + <listitem><para> + Horizontal sync is active high + </para></listitem> + </varlistentry> + <varlistentry> + <term>DRM_MODE_FLAG_NHSYNC</term> + <listitem><para> + Horizontal sync is active low + </para></listitem> + </varlistentry> + <varlistentry> + <term>DRM_MODE_FLAG_PVSYNC</term> + <listitem><para> + Vertical sync is active high + </para></listitem> + </varlistentry> + <varlistentry> + <term>DRM_MODE_FLAG_NVSYNC</term> + <listitem><para> + Vertical sync is active low + </para></listitem> + </varlistentry> + <varlistentry> + <term>DRM_MODE_FLAG_INTERLACE</term> + <listitem><para> + Mode is interlaced + </para></listitem> + </varlistentry> + <varlistentry> + <term>DRM_MODE_FLAG_DBLSCAN</term> + <listitem><para> + Mode uses doublescan + </para></listitem> + </varlistentry> + <varlistentry> + <term>DRM_MODE_FLAG_CSYNC</term> + <listitem><para> + Mode uses composite sync + </para></listitem> + </varlistentry> + <varlistentry> + <term>DRM_MODE_FLAG_PCSYNC</term> + <listitem><para> + Composite sync is active high + </para></listitem> + </varlistentry> + <varlistentry> + <term>DRM_MODE_FLAG_NCSYNC</term> + <listitem><para> + Composite sync is active low + </para></listitem> + </varlistentry> + <varlistentry> + <term>DRM_MODE_FLAG_HSKEW</term> + <listitem><para> + hskew provided (not used?) + </para></listitem> + </varlistentry> + <varlistentry> + <term>DRM_MODE_FLAG_BCAST</term> + <listitem><para> + not used? + </para></listitem> + </varlistentry> + <varlistentry> + <term>DRM_MODE_FLAG_PIXMUX</term> + <listitem><para> + not used? + </para></listitem> + </varlistentry> + <varlistentry> + <term>DRM_MODE_FLAG_DBLCLK</term> + <listitem><para> + not used? + </para></listitem> + </varlistentry> + <varlistentry> + <term>DRM_MODE_FLAG_CLKDIV2</term> + <listitem><para> + ? + </para></listitem> + </varlistentry> + </variablelist> + </para> + <para> + Note that modes marked with the INTERLACE or DBLSCAN flags will be + filtered out by + <function>drm_helper_probe_single_connector_modes</function> if + the connector's <structfield>interlace_allowed</structfield> or + <structfield>doublescan_allowed</structfield> field is set to 0. + </para> + </listitem> + <listitem> + <synopsis>char name[DRM_DISPLAY_MODE_LEN];</synopsis> + <para> + Mode name. The driver must call + <function>drm_mode_set_name</function> to fill the mode name from + <structfield>hdisplay</structfield>, + <structfield>vdisplay</structfield> and interlace flag after + filling the corresponding fields. + </para> + </listitem> + </itemizedlist> + </para> + <para> + The <structfield>vrefresh</structfield> value is computed by + <function>drm_helper_probe_single_connector_modes</function>. + </para> + <para> + When parsing EDID data, <function>drm_add_edid_modes</function> fill the + connector <structfield>display_info</structfield> + <structfield>width_mm</structfield> and + <structfield>height_mm</structfield> fields. When creating modes + manually the <methodname>get_modes</methodname> helper operation must + set the <structfield>display_info</structfield> + <structfield>width_mm</structfield> and + <structfield>height_mm</structfield> fields if they haven't been set + already (for instance at initialization time when a fixed-size panel is + attached to the connector). The mode <structfield>width_mm</structfield> + and <structfield>height_mm</structfield> fields are only used internally + during EDID parsing and should not be set when creating modes manually. + </para> + </listitem> + <listitem> + <synopsis>int (*mode_valid)(struct drm_connector *connector, + struct drm_display_mode *mode);</synopsis> + <para> + Verify whether a mode is valid for the connector. Return MODE_OK for + supported modes and one of the enum drm_mode_status values (MODE_*) + for unsupported modes. This operation is optional. + </para> + <para> + As the mode rejection reason is currently not used beside for + immediately removing the unsupported mode, an implementation can + return MODE_BAD regardless of the exact reason why the mode is not + valid. + </para> + <note><para> + Note that the <methodname>mode_valid</methodname> helper operation is + only called for modes detected by the device, and + <emphasis>not</emphasis> for modes set by the user through the CRTC + <methodname>set_config</methodname> operation. + </para></note> + </listitem> + </itemizedlist> + </sect2> + <sect2> + <title>Modeset Helper Functions Reference</title> +!Edrivers/gpu/drm/drm_crtc_helper.c + </sect2> + <sect2> + <title>Output Probing Helper Functions Reference</title> +!Pdrivers/gpu/drm/drm_probe_helper.c output probing helper overview +!Edrivers/gpu/drm/drm_probe_helper.c + </sect2> + <sect2> + <title>fbdev Helper Functions Reference</title> +!Pdrivers/gpu/drm/drm_fb_helper.c fbdev helpers +!Edrivers/gpu/drm/drm_fb_helper.c +!Iinclude/drm/drm_fb_helper.h + </sect2> + <sect2> + <title>Display Port Helper Functions Reference</title> +!Pdrivers/gpu/drm/drm_dp_helper.c dp helpers +!Iinclude/drm/drm_dp_helper.h +!Edrivers/gpu/drm/drm_dp_helper.c + </sect2> + <sect2> + <title>EDID Helper Functions Reference</title> +!Edrivers/gpu/drm/drm_edid.c + </sect2> + <sect2> + <title>Rectangle Utilities Reference</title> +!Pinclude/drm/drm_rect.h rect utils +!Iinclude/drm/drm_rect.h +!Edrivers/gpu/drm/drm_rect.c + </sect2> + <sect2> + <title>Flip-work Helper Reference</title> +!Pinclude/drm/drm_flip_work.h flip utils +!Iinclude/drm/drm_flip_work.h +!Edrivers/gpu/drm/drm_flip_work.c + </sect2> + <sect2> + <title>HDMI Infoframes Helper Reference</title> + <para> + Strictly speaking this is not a DRM helper library but generally useable + by any driver interfacing with HDMI outputs like v4l or alsa drivers. + But it nicely fits into the overall topic of mode setting helper + libraries and hence is also included here. + </para> +!Iinclude/linux/hdmi.h +!Edrivers/video/hdmi.c + </sect2> + <sect2> + <title id="drm-kms-planehelpers">Plane Helper Reference</title> +!Edrivers/gpu/drm/drm_plane_helper.c Plane Helpers + </sect2> + </sect1> + + <!-- Internals: kms properties --> + + <sect1 id="drm-kms-properties"> + <title>KMS Properties</title> + <para> + Drivers may need to expose additional parameters to applications than + those described in the previous sections. KMS supports attaching + properties to CRTCs, connectors and planes and offers a userspace API to + list, get and set the property values. + </para> + <para> + Properties are identified by a name that uniquely defines the property + purpose, and store an associated value. For all property types except blob + properties the value is a 64-bit unsigned integer. + </para> + <para> + KMS differentiates between properties and property instances. Drivers + first create properties and then create and associate individual instances + of those properties to objects. A property can be instantiated multiple + times and associated with different objects. Values are stored in property + instances, and all other property information are stored in the property + and shared between all instances of the property. + </para> + <para> + Every property is created with a type that influences how the KMS core + handles the property. Supported property types are + <variablelist> + <varlistentry> + <term>DRM_MODE_PROP_RANGE</term> + <listitem><para>Range properties report their minimum and maximum + admissible values. The KMS core verifies that values set by + application fit in that range.</para></listitem> + </varlistentry> + <varlistentry> + <term>DRM_MODE_PROP_ENUM</term> + <listitem><para>Enumerated properties take a numerical value that + ranges from 0 to the number of enumerated values defined by the + property minus one, and associate a free-formed string name to each + value. Applications can retrieve the list of defined value-name pairs + and use the numerical value to get and set property instance values. + </para></listitem> + </varlistentry> + <varlistentry> + <term>DRM_MODE_PROP_BITMASK</term> + <listitem><para>Bitmask properties are enumeration properties that + additionally restrict all enumerated values to the 0..63 range. + Bitmask property instance values combine one or more of the + enumerated bits defined by the property.</para></listitem> + </varlistentry> + <varlistentry> + <term>DRM_MODE_PROP_BLOB</term> + <listitem><para>Blob properties store a binary blob without any format + restriction. The binary blobs are created as KMS standalone objects, + and blob property instance values store the ID of their associated + blob object.</para> + <para>Blob properties are only used for the connector EDID property + and cannot be created by drivers.</para></listitem> + </varlistentry> + </variablelist> + </para> + <para> + To create a property drivers call one of the following functions depending + on the property type. All property creation functions take property flags + and name, as well as type-specific arguments. + <itemizedlist> + <listitem> + <synopsis>struct drm_property *drm_property_create_range(struct drm_device *dev, int flags, + const char *name, + uint64_t min, uint64_t max);</synopsis> + <para>Create a range property with the given minimum and maximum + values.</para> + </listitem> + <listitem> + <synopsis>struct drm_property *drm_property_create_enum(struct drm_device *dev, int flags, + const char *name, + const struct drm_prop_enum_list *props, + int num_values);</synopsis> + <para>Create an enumerated property. The <parameter>props</parameter> + argument points to an array of <parameter>num_values</parameter> + value-name pairs.</para> + </listitem> + <listitem> + <synopsis>struct drm_property *drm_property_create_bitmask(struct drm_device *dev, + int flags, const char *name, + const struct drm_prop_enum_list *props, + int num_values);</synopsis> + <para>Create a bitmask property. The <parameter>props</parameter> + argument points to an array of <parameter>num_values</parameter> + value-name pairs.</para> + </listitem> + </itemizedlist> + </para> + <para> + Properties can additionally be created as immutable, in which case they + will be read-only for applications but can be modified by the driver. To + create an immutable property drivers must set the DRM_MODE_PROP_IMMUTABLE + flag at property creation time. + </para> + <para> + When no array of value-name pairs is readily available at property + creation time for enumerated or range properties, drivers can create + the property using the <function>drm_property_create</function> function + and manually add enumeration value-name pairs by calling the + <function>drm_property_add_enum</function> function. Care must be taken to + properly specify the property type through the <parameter>flags</parameter> + argument. + </para> + <para> + After creating properties drivers can attach property instances to CRTC, + connector and plane objects by calling the + <function>drm_object_attach_property</function>. The function takes a + pointer to the target object, a pointer to the previously created property + and an initial instance value. + </para> + <sect2> + <title>Existing KMS Properties</title> + <para> + The following table gives description of drm properties exposed by various + modules/drivers. + </para> + <table border="1" cellpadding="0" cellspacing="0"> + <tbody> + <tr style="font-weight: bold;"> + <td valign="top" >Owner Module/Drivers</td> + <td valign="top" >Group</td> + <td valign="top" >Property Name</td> + <td valign="top" >Type</td> + <td valign="top" >Property Values</td> + <td valign="top" >Object attached</td> + <td valign="top" >Description/Restrictions</td> + </tr> + <tr> + <td rowspan="20" valign="top" >DRM</td> + <td rowspan="2" valign="top" >Generic</td> + <td valign="top" >“EDID”</td> + <td valign="top" >BLOB | IMMUTABLE</td> + <td valign="top" >0</td> + <td valign="top" >Connector</td> + <td valign="top" >Contains id of edid blob ptr object.</td> + </tr> + <tr> + <td valign="top" >“DPMS”</td> + <td valign="top" >ENUM</td> + <td valign="top" >{ “On”, “Standby”, “Suspend”, “Off” }</td> + <td valign="top" >Connector</td> + <td valign="top" >Contains DPMS operation mode value.</td> + </tr> + <tr> + <td rowspan="1" valign="top" >Plane</td> + <td valign="top" >“type”</td> + <td valign="top" >ENUM | IMMUTABLE</td> + <td valign="top" >{ "Overlay", "Primary", "Cursor" }</td> + <td valign="top" >Plane</td> + <td valign="top" >Plane type</td> + </tr> + <tr> + <td rowspan="2" valign="top" >DVI-I</td> + <td valign="top" >“subconnector”</td> + <td valign="top" >ENUM</td> + <td valign="top" >{ “Unknown”, “DVI-D”, “DVI-A” }</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“select subconnector”</td> + <td valign="top" >ENUM</td> + <td valign="top" >{ “Automatic”, “DVI-D”, “DVI-A” }</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td rowspan="13" valign="top" >TV</td> + <td valign="top" >“subconnector”</td> + <td valign="top" >ENUM</td> + <td valign="top" >{ "Unknown", "Composite", "SVIDEO", "Component", "SCART" }</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“select subconnector”</td> + <td valign="top" >ENUM</td> + <td valign="top" >{ "Automatic", "Composite", "SVIDEO", "Component", "SCART" }</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“mode”</td> + <td valign="top" >ENUM</td> + <td valign="top" >{ "NTSC_M", "NTSC_J", "NTSC_443", "PAL_B" } etc.</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“left margin”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=100</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“right margin”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=100</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“top margin”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=100</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“bottom margin”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=100</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“brightness”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=100</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“contrast”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=100</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“flicker reduction”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=100</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“overscan”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=100</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“saturation”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=100</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“hue”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=100</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td rowspan="2" valign="top" >Optional</td> + <td valign="top" >“scaling mode”</td> + <td valign="top" >ENUM</td> + <td valign="top" >{ "None", "Full", "Center", "Full aspect" }</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“dirty”</td> + <td valign="top" >ENUM | IMMUTABLE</td> + <td valign="top" >{ "Off", "On", "Annotate" }</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td rowspan="21" valign="top" >i915</td> + <td rowspan="3" valign="top" >Generic</td> + <td valign="top" >"Broadcast RGB"</td> + <td valign="top" >ENUM</td> + <td valign="top" >{ "Automatic", "Full", "Limited 16:235" }</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“audio”</td> + <td valign="top" >ENUM</td> + <td valign="top" >{ "force-dvi", "off", "auto", "on" }</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >Standard name as in DRM</td> + <td valign="top" >Standard type as in DRM</td> + <td valign="top" >Standard value as in DRM</td> + <td valign="top" >Standard Object as in DRM</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td rowspan="17" valign="top" >SDVO-TV</td> + <td valign="top" >“mode”</td> + <td valign="top" >ENUM</td> + <td valign="top" >{ "NTSC_M", "NTSC_J", "NTSC_443", "PAL_B" } etc.</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >"left_margin"</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max= SDVO dependent</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >"right_margin"</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max= SDVO dependent</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >"top_margin"</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max= SDVO dependent</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >"bottom_margin"</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max= SDVO dependent</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“hpos”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max= SDVO dependent</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“vpos”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max= SDVO dependent</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“contrast”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max= SDVO dependent</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“saturation”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max= SDVO dependent</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“hue”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max= SDVO dependent</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“sharpness”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max= SDVO dependent</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“flicker_filter”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max= SDVO dependent</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“flicker_filter_adaptive”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max= SDVO dependent</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“flicker_filter_2d”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max= SDVO dependent</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“tv_chroma_filter”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max= SDVO dependent</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“tv_luma_filter”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max= SDVO dependent</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“dot_crawl”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=1</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >SDVO-TV/LVDS</td> + <td valign="top" >“brightness”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max= SDVO dependent</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td rowspan="3" valign="top" >CDV gma-500</td> + <td rowspan="3" valign="top" >Generic</td> + <td valign="top" >"Broadcast RGB"</td> + <td valign="top" >ENUM</td> + <td valign="top" >{ “Full”, “Limited 16:235” }</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >"Broadcast RGB"</td> + <td valign="top" >ENUM</td> + <td valign="top" >{ “off”, “auto”, “on” }</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >Standard name as in DRM</td> + <td valign="top" >Standard type as in DRM</td> + <td valign="top" >Standard value as in DRM</td> + <td valign="top" >Standard Object as in DRM</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td rowspan="20" valign="top" >Poulsbo</td> + <td rowspan="2" valign="top" >Generic</td> + <td valign="top" >“backlight”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=100</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >Standard name as in DRM</td> + <td valign="top" >Standard type as in DRM</td> + <td valign="top" >Standard value as in DRM</td> + <td valign="top" >Standard Object as in DRM</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td rowspan="17" valign="top" >SDVO-TV</td> + <td valign="top" >“mode”</td> + <td valign="top" >ENUM</td> + <td valign="top" >{ "NTSC_M", "NTSC_J", "NTSC_443", "PAL_B" } etc.</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >"left_margin"</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max= SDVO dependent</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >"right_margin"</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max= SDVO dependent</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >"top_margin"</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max= SDVO dependent</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >"bottom_margin"</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max= SDVO dependent</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“hpos”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max= SDVO dependent</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“vpos”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max= SDVO dependent</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“contrast”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max= SDVO dependent</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“saturation”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max= SDVO dependent</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“hue”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max= SDVO dependent</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“sharpness”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max= SDVO dependent</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“flicker_filter”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max= SDVO dependent</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“flicker_filter_adaptive”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max= SDVO dependent</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“flicker_filter_2d”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max= SDVO dependent</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“tv_chroma_filter”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max= SDVO dependent</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“tv_luma_filter”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max= SDVO dependent</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“dot_crawl”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=1</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >SDVO-TV/LVDS</td> + <td valign="top" >“brightness”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max= SDVO dependent</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td rowspan="11" valign="top" >armada</td> + <td rowspan="2" valign="top" >CRTC</td> + <td valign="top" >"CSC_YUV"</td> + <td valign="top" >ENUM</td> + <td valign="top" >{ "Auto" , "CCIR601", "CCIR709" }</td> + <td valign="top" >CRTC</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >"CSC_RGB"</td> + <td valign="top" >ENUM</td> + <td valign="top" >{ "Auto", "Computer system", "Studio" }</td> + <td valign="top" >CRTC</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td rowspan="9" valign="top" >Overlay</td> + <td valign="top" >"colorkey"</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=0xffffff</td> + <td valign="top" >Plane</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >"colorkey_min"</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=0xffffff</td> + <td valign="top" >Plane</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >"colorkey_max"</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=0xffffff</td> + <td valign="top" >Plane</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >"colorkey_val"</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=0xffffff</td> + <td valign="top" >Plane</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >"colorkey_alpha"</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=0xffffff</td> + <td valign="top" >Plane</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >"colorkey_mode"</td> + <td valign="top" >ENUM</td> + <td valign="top" >{ "disabled", "Y component", "U component" + , "V component", "RGB", “R component", "G component", "B component" }</td> + <td valign="top" >Plane</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >"brightness"</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=256 + 255</td> + <td valign="top" >Plane</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >"contrast"</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=0x7fff</td> + <td valign="top" >Plane</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >"saturation"</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=0x7fff</td> + <td valign="top" >Plane</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td rowspan="2" valign="top" >exynos</td> + <td valign="top" >CRTC</td> + <td valign="top" >“mode”</td> + <td valign="top" >ENUM</td> + <td valign="top" >{ "normal", "blank" }</td> + <td valign="top" >CRTC</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >Overlay</td> + <td valign="top" >“zpos”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=MAX_PLANE-1</td> + <td valign="top" >Plane</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td rowspan="3" valign="top" >i2c/ch7006_drv</td> + <td valign="top" >Generic</td> + <td valign="top" >“scale”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=2</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td rowspan="2" valign="top" >TV</td> + <td valign="top" >Standard names as in DRM</td> + <td valign="top" >Standard types as in DRM</td> + <td valign="top" >Standard Values as in DRM</td> + <td valign="top" >Standard object as in DRM</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“mode”</td> + <td valign="top" >ENUM</td> + <td valign="top" >{ "PAL", "PAL-M","PAL-N"}, ”PAL-Nc" + , "PAL-60", "NTSC-M", "NTSC-J" }</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td rowspan="16" valign="top" >nouveau</td> + <td rowspan="6" valign="top" >NV10 Overlay</td> + <td valign="top" >"colorkey"</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=0x01ffffff</td> + <td valign="top" >Plane</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“contrast”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=8192-1</td> + <td valign="top" >Plane</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“brightness”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=1024</td> + <td valign="top" >Plane</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“hue”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=359</td> + <td valign="top" >Plane</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“saturation”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=8192-1</td> + <td valign="top" >Plane</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“iturbt_709”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=1</td> + <td valign="top" >Plane</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td rowspan="2" valign="top" >Nv04 Overlay</td> + <td valign="top" >“colorkey”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=0x01ffffff</td> + <td valign="top" >Plane</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“brightness”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=1024</td> + <td valign="top" >Plane</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td rowspan="7" valign="top" >Display</td> + <td valign="top" >“dithering mode”</td> + <td valign="top" >ENUM</td> + <td valign="top" >{ "auto", "off", "on" }</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“dithering depth”</td> + <td valign="top" >ENUM</td> + <td valign="top" >{ "auto", "off", "on", "static 2x2", "dynamic 2x2", "temporal" }</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“underscan”</td> + <td valign="top" >ENUM</td> + <td valign="top" >{ "auto", "6 bpc", "8 bpc" }</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“underscan hborder”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=128</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“underscan vborder”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=128</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“vibrant hue”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=180</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“color vibrance”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=200</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >Generic</td> + <td valign="top" >Standard name as in DRM</td> + <td valign="top" >Standard type as in DRM</td> + <td valign="top" >Standard value as in DRM</td> + <td valign="top" >Standard Object as in DRM</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td rowspan="2" valign="top" >omap</td> + <td rowspan="2" valign="top" >Generic</td> + <td valign="top" >“rotation”</td> + <td valign="top" >BITMASK</td> + <td valign="top" >{ 0, "rotate-0" }, + { 1, "rotate-90" }, + { 2, "rotate-180" }, + { 3, "rotate-270" }, + { 4, "reflect-x" }, + { 5, "reflect-y" }</td> + <td valign="top" >CRTC, Plane</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >“zorder”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=3</td> + <td valign="top" >CRTC, Plane</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >qxl</td> + <td valign="top" >Generic</td> + <td valign="top" >“hotplug_mode_update"</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=1</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td rowspan="10" valign="top" >radeon</td> + <td valign="top" >DVI-I</td> + <td valign="top" >“coherent”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=1</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >DAC enable load detect</td> + <td valign="top" >“load detection”</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=1</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >TV Standard</td> + <td valign="top" >"tv standard"</td> + <td valign="top" >ENUM</td> + <td valign="top" >{ "ntsc", "pal", "pal-m", "pal-60", "ntsc-j" + , "scart-pal", "pal-cn", "secam" }</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >legacy TMDS PLL detect</td> + <td valign="top" >"tmds_pll"</td> + <td valign="top" >ENUM</td> + <td valign="top" >{ "driver", "bios" }</td> + <td valign="top" >-</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td rowspan="3" valign="top" >Underscan</td> + <td valign="top" >"underscan"</td> + <td valign="top" >ENUM</td> + <td valign="top" >{ "off", "on", "auto" }</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >"underscan hborder"</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=128</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >"underscan vborder"</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=128</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >Audio</td> + <td valign="top" >“audio”</td> + <td valign="top" >ENUM</td> + <td valign="top" >{ "off", "on", "auto" }</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >FMT Dithering</td> + <td valign="top" >“dither”</td> + <td valign="top" >ENUM</td> + <td valign="top" >{ "off", "on" }</td> + <td valign="top" >Connector</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >Generic</td> + <td valign="top" >Standard name as in DRM</td> + <td valign="top" >Standard type as in DRM</td> + <td valign="top" >Standard value as in DRM</td> + <td valign="top" >Standard Object as in DRM</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td rowspan="3" valign="top" >rcar-du</td> + <td rowspan="3" valign="top" >Generic</td> + <td valign="top" >"alpha"</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=255</td> + <td valign="top" >Plane</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >"colorkey"</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=0, Max=0x01ffffff</td> + <td valign="top" >Plane</td> + <td valign="top" >TBD</td> + </tr> + <tr> + <td valign="top" >"zpos"</td> + <td valign="top" >RANGE</td> + <td valign="top" >Min=1, Max=7</td> + <td valign="top" >Plane</td> + <td valign="top" >TBD</td> + </tr> + </tbody> + </table> + </sect2> + </sect1> + + <!-- Internals: vertical blanking --> + + <sect1 id="drm-vertical-blank"> + <title>Vertical Blanking</title> + <para> + Vertical blanking plays a major role in graphics rendering. To achieve + tear-free display, users must synchronize page flips and/or rendering to + vertical blanking. The DRM API offers ioctls to perform page flips + synchronized to vertical blanking and wait for vertical blanking. + </para> + <para> + The DRM core handles most of the vertical blanking management logic, which + involves filtering out spurious interrupts, keeping race-free blanking + counters, coping with counter wrap-around and resets and keeping use + counts. It relies on the driver to generate vertical blanking interrupts + and optionally provide a hardware vertical blanking counter. Drivers must + implement the following operations. + </para> + <itemizedlist> + <listitem> + <synopsis>int (*enable_vblank) (struct drm_device *dev, int crtc); +void (*disable_vblank) (struct drm_device *dev, int crtc);</synopsis> + <para> + Enable or disable vertical blanking interrupts for the given CRTC. + </para> + </listitem> + <listitem> + <synopsis>u32 (*get_vblank_counter) (struct drm_device *dev, int crtc);</synopsis> + <para> + Retrieve the value of the vertical blanking counter for the given + CRTC. If the hardware maintains a vertical blanking counter its value + should be returned. Otherwise drivers can use the + <function>drm_vblank_count</function> helper function to handle this + operation. + </para> + </listitem> + </itemizedlist> + <para> + Drivers must initialize the vertical blanking handling core with a call to + <function>drm_vblank_init</function> in their + <methodname>load</methodname> operation. The function will set the struct + <structname>drm_device</structname> + <structfield>vblank_disable_allowed</structfield> field to 0. This will + keep vertical blanking interrupts enabled permanently until the first mode + set operation, where <structfield>vblank_disable_allowed</structfield> is + set to 1. The reason behind this is not clear. Drivers can set the field + to 1 after <function>calling drm_vblank_init</function> to make vertical + blanking interrupts dynamically managed from the beginning. + </para> + <para> + Vertical blanking interrupts can be enabled by the DRM core or by drivers + themselves (for instance to handle page flipping operations). The DRM core + maintains a vertical blanking use count to ensure that the interrupts are + not disabled while a user still needs them. To increment the use count, + drivers call <function>drm_vblank_get</function>. Upon return vertical + blanking interrupts are guaranteed to be enabled. + </para> + <para> + To decrement the use count drivers call + <function>drm_vblank_put</function>. Only when the use count drops to zero + will the DRM core disable the vertical blanking interrupts after a delay + by scheduling a timer. The delay is accessible through the vblankoffdelay + module parameter or the <varname>drm_vblank_offdelay</varname> global + variable and expressed in milliseconds. Its default value is 5000 ms. + </para> + <para> + When a vertical blanking interrupt occurs drivers only need to call the + <function>drm_handle_vblank</function> function to account for the + interrupt. + </para> + <para> + Resources allocated by <function>drm_vblank_init</function> must be freed + with a call to <function>drm_vblank_cleanup</function> in the driver + <methodname>unload</methodname> operation handler. + </para> + <sect2> + <title>Vertical Blanking and Interrupt Handling Functions Reference</title> +!Edrivers/gpu/drm/drm_irq.c + </sect2> + </sect1> + + <!-- Internals: open/close, file operations and ioctls --> + + <sect1> + <title>Open/Close, File Operations and IOCTLs</title> + <sect2> + <title>Open and Close</title> + <synopsis>int (*firstopen) (struct drm_device *); +void (*lastclose) (struct drm_device *); +int (*open) (struct drm_device *, struct drm_file *); +void (*preclose) (struct drm_device *, struct drm_file *); +void (*postclose) (struct drm_device *, struct drm_file *);</synopsis> + <abstract>Open and close handlers. None of those methods are mandatory. + </abstract> + <para> + The <methodname>firstopen</methodname> method is called by the DRM core + for legacy UMS (User Mode Setting) drivers only when an application + opens a device that has no other opened file handle. UMS drivers can + implement it to acquire device resources. KMS drivers can't use the + method and must acquire resources in the <methodname>load</methodname> + method instead. + </para> + <para> + Similarly the <methodname>lastclose</methodname> method is called when + the last application holding a file handle opened on the device closes + it, for both UMS and KMS drivers. Additionally, the method is also + called at module unload time or, for hot-pluggable devices, when the + device is unplugged. The <methodname>firstopen</methodname> and + <methodname>lastclose</methodname> calls can thus be unbalanced. + </para> + <para> + The <methodname>open</methodname> method is called every time the device + is opened by an application. Drivers can allocate per-file private data + in this method and store them in the struct + <structname>drm_file</structname> <structfield>driver_priv</structfield> + field. Note that the <methodname>open</methodname> method is called + before <methodname>firstopen</methodname>. + </para> + <para> + The close operation is split into <methodname>preclose</methodname> and + <methodname>postclose</methodname> methods. Drivers must stop and + cleanup all per-file operations in the <methodname>preclose</methodname> + method. For instance pending vertical blanking and page flip events must + be cancelled. No per-file operation is allowed on the file handle after + returning from the <methodname>preclose</methodname> method. + </para> + <para> + Finally the <methodname>postclose</methodname> method is called as the + last step of the close operation, right before calling the + <methodname>lastclose</methodname> method if no other open file handle + exists for the device. Drivers that have allocated per-file private data + in the <methodname>open</methodname> method should free it here. + </para> + <para> + The <methodname>lastclose</methodname> method should restore CRTC and + plane properties to default value, so that a subsequent open of the + device will not inherit state from the previous user. It can also be + used to execute delayed power switching state changes, e.g. in + conjunction with the vga-switcheroo infrastructure. Beyond that KMS + drivers should not do any further cleanup. Only legacy UMS drivers might + need to clean up device state so that the vga console or an independent + fbdev driver could take over. + </para> + </sect2> + <sect2> + <title>File Operations</title> + <synopsis>const struct file_operations *fops</synopsis> + <abstract>File operations for the DRM device node.</abstract> + <para> + Drivers must define the file operations structure that forms the DRM + userspace API entry point, even though most of those operations are + implemented in the DRM core. The <methodname>open</methodname>, + <methodname>release</methodname> and <methodname>ioctl</methodname> + operations are handled by + <programlisting> + .owner = THIS_MODULE, + .open = drm_open, + .release = drm_release, + .unlocked_ioctl = drm_ioctl, + #ifdef CONFIG_COMPAT + .compat_ioctl = drm_compat_ioctl, + #endif + </programlisting> + </para> + <para> + Drivers that implement private ioctls that requires 32/64bit + compatibility support must provide their own + <methodname>compat_ioctl</methodname> handler that processes private + ioctls and calls <function>drm_compat_ioctl</function> for core ioctls. + </para> + <para> + The <methodname>read</methodname> and <methodname>poll</methodname> + operations provide support for reading DRM events and polling them. They + are implemented by + <programlisting> + .poll = drm_poll, + .read = drm_read, + .llseek = no_llseek, + </programlisting> + </para> + <para> + The memory mapping implementation varies depending on how the driver + manages memory. Pre-GEM drivers will use <function>drm_mmap</function>, + while GEM-aware drivers will use <function>drm_gem_mmap</function>. See + <xref linkend="drm-gem"/>. + <programlisting> + .mmap = drm_gem_mmap, + </programlisting> + </para> + <para> + No other file operation is supported by the DRM API. + </para> + </sect2> + <sect2> + <title>IOCTLs</title> + <synopsis>struct drm_ioctl_desc *ioctls; +int num_ioctls;</synopsis> + <abstract>Driver-specific ioctls descriptors table.</abstract> + <para> + Driver-specific ioctls numbers start at DRM_COMMAND_BASE. The ioctls + descriptors table is indexed by the ioctl number offset from the base + value. Drivers can use the DRM_IOCTL_DEF_DRV() macro to initialize the + table entries. + </para> + <para> + <programlisting>DRM_IOCTL_DEF_DRV(ioctl, func, flags)</programlisting> + <para> + <parameter>ioctl</parameter> is the ioctl name. Drivers must define + the DRM_##ioctl and DRM_IOCTL_##ioctl macros to the ioctl number + offset from DRM_COMMAND_BASE and the ioctl number respectively. The + first macro is private to the device while the second must be exposed + to userspace in a public header. + </para> + <para> + <parameter>func</parameter> is a pointer to the ioctl handler function + compatible with the <type>drm_ioctl_t</type> type. + <programlisting>typedef int drm_ioctl_t(struct drm_device *dev, void *data, + struct drm_file *file_priv);</programlisting> + </para> + <para> + <parameter>flags</parameter> is a bitmask combination of the following + values. It restricts how the ioctl is allowed to be called. + <itemizedlist> + <listitem><para> + DRM_AUTH - Only authenticated callers allowed + </para></listitem> + <listitem><para> + DRM_MASTER - The ioctl can only be called on the master file + handle + </para></listitem> + <listitem><para> + DRM_ROOT_ONLY - Only callers with the SYSADMIN capability allowed + </para></listitem> + <listitem><para> + DRM_CONTROL_ALLOW - The ioctl can only be called on a control + device + </para></listitem> + <listitem><para> + DRM_UNLOCKED - The ioctl handler will be called without locking + the DRM global mutex + </para></listitem> + </itemizedlist> + </para> + </para> + </sect2> + </sect1> + <sect1> + <title>Legacy Support Code</title> + <para> + The section very briefly covers some of the old legacy support code which + is only used by old DRM drivers which have done a so-called shadow-attach + to the underlying device instead of registering as a real driver. This + also includes some of the old generic buffer management and command + submission code. Do not use any of this in new and modern drivers. + </para> + + <sect2> + <title>Legacy Suspend/Resume</title> + <para> + The DRM core provides some suspend/resume code, but drivers wanting full + suspend/resume support should provide save() and restore() functions. + These are called at suspend, hibernate, or resume time, and should perform + any state save or restore required by your device across suspend or + hibernate states. + </para> + <synopsis>int (*suspend) (struct drm_device *, pm_message_t state); + int (*resume) (struct drm_device *);</synopsis> + <para> + Those are legacy suspend and resume methods which + <emphasis>only</emphasis> work with the legacy shadow-attach driver + registration functions. New driver should use the power management + interface provided by their bus type (usually through + the struct <structname>device_driver</structname> dev_pm_ops) and set + these methods to NULL. + </para> + </sect2> + + <sect2> + <title>Legacy DMA Services</title> + <para> + This should cover how DMA mapping etc. is supported by the core. + These functions are deprecated and should not be used. + </para> + </sect2> + </sect1> + </chapter> + +<!-- TODO + +- Add a glossary +- Document the struct_mutex catch-all lock +- Document connector properties + +- Why is the load method optional? +- What are drivers supposed to set the initial display state to, and how? + Connector's DPMS states are not initialized and are thus equal to + DRM_MODE_DPMS_ON. The fbcon compatibility layer calls + drm_helper_disable_unused_functions(), which disables unused encoders and + CRTCs, but doesn't touch the connectors' DPMS state, and + drm_helper_connector_dpms() in reaction to fbdev blanking events. Do drivers + that don't implement (or just don't use) fbcon compatibility need to call + those functions themselves? +- KMS drivers must call drm_vblank_pre_modeset() and drm_vblank_post_modeset() + around mode setting. Should this be done in the DRM core? +- vblank_disable_allowed is set to 1 in the first drm_vblank_post_modeset() + call and never set back to 0. It seems to be safe to permanently set it to 1 + in drm_vblank_init() for KMS driver, and it might be safe for UMS drivers as + well. This should be investigated. +- crtc and connector .save and .restore operations are only used internally in + drivers, should they be removed from the core? +- encoder mid-layer .save and .restore operations are only used internally in + drivers, should they be removed from the core? +- encoder mid-layer .detect operation is only used internally in drivers, + should it be removed from the core? +--> + + <!-- External interfaces --> + + <chapter id="drmExternals"> + <title>Userland interfaces</title> + <para> + The DRM core exports several interfaces to applications, + generally intended to be used through corresponding libdrm + wrapper functions. In addition, drivers export device-specific + interfaces for use by userspace drivers & device-aware + applications through ioctls and sysfs files. + </para> + <para> + External interfaces include: memory mapping, context management, + DMA operations, AGP management, vblank control, fence + management, memory management, and output management. + </para> + <para> + Cover generic ioctls and sysfs layout here. We only need high-level + info, since man pages should cover the rest. + </para> + + <!-- External: render nodes --> + + <sect1> + <title>Render nodes</title> + <para> + DRM core provides multiple character-devices for user-space to use. + Depending on which device is opened, user-space can perform a different + set of operations (mainly ioctls). The primary node is always created + and called card<num>. Additionally, a currently + unused control node, called controlD<num> is also + created. The primary node provides all legacy operations and + historically was the only interface used by userspace. With KMS, the + control node was introduced. However, the planned KMS control interface + has never been written and so the control node stays unused to date. + </para> + <para> + With the increased use of offscreen renderers and GPGPU applications, + clients no longer require running compositors or graphics servers to + make use of a GPU. But the DRM API required unprivileged clients to + authenticate to a DRM-Master prior to getting GPU access. To avoid this + step and to grant clients GPU access without authenticating, render + nodes were introduced. Render nodes solely serve render clients, that + is, no modesetting or privileged ioctls can be issued on render nodes. + Only non-global rendering commands are allowed. If a driver supports + render nodes, it must advertise it via the DRIVER_RENDER + DRM driver capability. If not supported, the primary node must be used + for render clients together with the legacy drmAuth authentication + procedure. + </para> + <para> + If a driver advertises render node support, DRM core will create a + separate render node called renderD<num>. There will + be one render node per device. No ioctls except PRIME-related ioctls + will be allowed on this node. Especially GEM_OPEN will be + explicitly prohibited. Render nodes are designed to avoid the + buffer-leaks, which occur if clients guess the flink names or mmap + offsets on the legacy interface. Additionally to this basic interface, + drivers must mark their driver-dependent render-only ioctls as + DRM_RENDER_ALLOW so render clients can use them. Driver + authors must be careful not to allow any privileged ioctls on render + nodes. + </para> + <para> + With render nodes, user-space can now control access to the render node + via basic file-system access-modes. A running graphics server which + authenticates clients on the privileged primary/legacy node is no longer + required. Instead, a client can open the render node and is immediately + granted GPU access. Communication between clients (or servers) is done + via PRIME. FLINK from render node to legacy node is not supported. New + clients must not use the insecure FLINK interface. + </para> + <para> + Besides dropping all modeset/global ioctls, render nodes also drop the + DRM-Master concept. There is no reason to associate render clients with + a DRM-Master as they are independent of any graphics server. Besides, + they must work without any running master, anyway. + Drivers must be able to run without a master object if they support + render nodes. If, on the other hand, a driver requires shared state + between clients which is visible to user-space and accessible beyond + open-file boundaries, they cannot support render nodes. + </para> + </sect1> + + <!-- External: vblank handling --> + + <sect1> + <title>VBlank event handling</title> + <para> + The DRM core exposes two vertical blank related ioctls: + <variablelist> + <varlistentry> + <term>DRM_IOCTL_WAIT_VBLANK</term> + <listitem> + <para> + This takes a struct drm_wait_vblank structure as its argument, + and it is used to block or request a signal when a specified + vblank event occurs. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>DRM_IOCTL_MODESET_CTL</term> + <listitem> + <para> + This was only used for user-mode-settind drivers around + modesetting changes to allow the kernel to update the vblank + interrupt after mode setting, since on many devices the vertical + blank counter is reset to 0 at some point during modeset. Modern + drivers should not call this any more since with kernel mode + setting it is a no-op. + </para> + </listitem> + </varlistentry> + </variablelist> + </para> + </sect1> + + </chapter> +</part> +<part id="drmDrivers"> + <title>DRM Drivers</title> + + <partintro> + <para> + This second part of the DRM Developer's Guide documents driver code, + implementation details and also all the driver-specific userspace + interfaces. Especially since all hardware-acceleration interfaces to + userspace are driver specific for efficiency and other reasons these + interfaces can be rather substantial. Hence every driver has its own + chapter. + </para> + </partintro> + + <chapter id="drmI915"> + <title>drm/i915 Intel GFX Driver</title> + <para> + The drm/i915 driver supports all (with the exception of some very early + models) integrated GFX chipsets with both Intel display and rendering + blocks. This excludes a set of SoC platforms with an SGX rendering unit, + those have basic support through the gma500 drm driver. + </para> + <sect1> + <title>Display Hardware Handling</title> + <para> + This section covers everything related to the display hardware including + the mode setting infrastructure, plane, sprite and cursor handling and + display, output probing and related topics. + </para> + <sect2> + <title>Mode Setting Infrastructure</title> + <para> + The i915 driver is thus far the only DRM driver which doesn't use the + common DRM helper code to implement mode setting sequences. Thus it + has its own tailor-made infrastructure for executing a display + configuration change. + </para> + </sect2> + <sect2> + <title>Plane Configuration</title> + <para> + This section covers plane configuration and composition with the + primary plane, sprites, cursors and overlays. This includes the + infrastructure to do atomic vsync'ed updates of all this state and + also tightly coupled topics like watermark setup and computation, + framebuffer compression and panel self refresh. + </para> + </sect2> + <sect2> + <title>Output Probing</title> + <para> + This section covers output probing and related infrastructure like the + hotplug interrupt storm detection and mitigation code. Note that the + i915 driver still uses most of the common DRM helper code for output + probing, so those sections fully apply. + </para> + </sect2> + <sect2> + <title>DPIO</title> +!Pdrivers/gpu/drm/i915/i915_reg.h DPIO + <table id="dpiox2"> + <title>Dual channel PHY (VLV/CHV)</title> + <tgroup cols="8"> + <colspec colname="c0" /> + <colspec colname="c1" /> + <colspec colname="c2" /> + <colspec colname="c3" /> + <colspec colname="c4" /> + <colspec colname="c5" /> + <colspec colname="c6" /> + <colspec colname="c7" /> + <spanspec spanname="ch0" namest="c0" nameend="c3" /> + <spanspec spanname="ch1" namest="c4" nameend="c7" /> + <spanspec spanname="ch0pcs01" namest="c0" nameend="c1" /> + <spanspec spanname="ch0pcs23" namest="c2" nameend="c3" /> + <spanspec spanname="ch1pcs01" namest="c4" nameend="c5" /> + <spanspec spanname="ch1pcs23" namest="c6" nameend="c7" /> + <thead> + <row> + <entry spanname="ch0">CH0</entry> + <entry spanname="ch1">CH1</entry> + </row> + </thead> + <tbody valign="top" align="center"> + <row> + <entry spanname="ch0">CMN/PLL/REF</entry> + <entry spanname="ch1">CMN/PLL/REF</entry> + </row> + <row> + <entry spanname="ch0pcs01">PCS01</entry> + <entry spanname="ch0pcs23">PCS23</entry> + <entry spanname="ch1pcs01">PCS01</entry> + <entry spanname="ch1pcs23">PCS23</entry> + </row> + <row> + <entry>TX0</entry> + <entry>TX1</entry> + <entry>TX2</entry> + <entry>TX3</entry> + <entry>TX0</entry> + <entry>TX1</entry> + <entry>TX2</entry> + <entry>TX3</entry> + </row> + <row> + <entry spanname="ch0">DDI0</entry> + <entry spanname="ch1">DDI1</entry> + </row> + </tbody> + </tgroup> + </table> + <table id="dpiox1"> + <title>Single channel PHY (CHV)</title> + <tgroup cols="4"> + <colspec colname="c0" /> + <colspec colname="c1" /> + <colspec colname="c2" /> + <colspec colname="c3" /> + <spanspec spanname="ch0" namest="c0" nameend="c3" /> + <spanspec spanname="ch0pcs01" namest="c0" nameend="c1" /> + <spanspec spanname="ch0pcs23" namest="c2" nameend="c3" /> + <thead> + <row> + <entry spanname="ch0">CH0</entry> + </row> + </thead> + <tbody valign="top" align="center"> + <row> + <entry spanname="ch0">CMN/PLL/REF</entry> + </row> + <row> + <entry spanname="ch0pcs01">PCS01</entry> + <entry spanname="ch0pcs23">PCS23</entry> + </row> + <row> + <entry>TX0</entry> + <entry>TX1</entry> + <entry>TX2</entry> + <entry>TX3</entry> + </row> + <row> + <entry spanname="ch0">DDI2</entry> + </row> + </tbody> + </tgroup> + </table> + </sect2> + </sect1> + + <sect1> + <title>Memory Management and Command Submission</title> + <para> + This sections covers all things related to the GEM implementation in the + i915 driver. + </para> + <sect2> + <title>Batchbuffer Parsing</title> +!Pdrivers/gpu/drm/i915/i915_cmd_parser.c batch buffer command parser +!Idrivers/gpu/drm/i915/i915_cmd_parser.c + </sect2> + </sect1> + </chapter> +</part> +</book> diff --git a/Documentation/DocBook/filesystems.tmpl b/Documentation/DocBook/filesystems.tmpl index 5e87ad58c0b..bcdfdb9a927 100644 --- a/Documentation/DocBook/filesystems.tmpl +++ b/Documentation/DocBook/filesystems.tmpl @@ -62,7 +62,7 @@ !Efs/mpage.c !Efs/namei.c !Efs/buffer.c -!Efs/bio.c +!Eblock/bio.c !Efs/seq_file.c !Efs/filesystems.c !Efs/fs-writeback.c @@ -82,11 +82,15 @@ </sect1> </chapter> + <chapter id="fs_events"> + <title>Events based on file descriptors</title> +!Efs/eventfd.c + </chapter> + <chapter id="sysfs"> <title>The Filesystem for Exporting Kernel Objects</title> !Efs/sysfs/file.c !Efs/sysfs/symlink.c -!Efs/sysfs/bin.c </chapter> <chapter id="debugfs"> @@ -219,8 +223,8 @@ all your transactions. </para> <para> -Then at umount time , in your put_super() (2.4) or write_super() (2.5) -you can then call journal_destroy() to clean up your in-core journal object. +Then at umount time , in your put_super() you can then call journal_destroy() +to clean up your in-core journal object. </para> <para> @@ -382,7 +386,7 @@ an example. <title>See also</title> <para> <citation> - <ulink url="ftp://ftp.uk.linux.org/pub/linux/sct/fs/jfs/journal-design.ps.gz"> + <ulink url="http://kernel.org/pub/linux/kernel/people/sct/ext3/journal-design.ps.gz"> Journaling the Linux ext2fs Filesystem, LinuxExpo 98, Stephen Tweedie </ulink> </citation> diff --git a/Documentation/DocBook/gadget.tmpl b/Documentation/DocBook/gadget.tmpl index 6ef2f0073e5..2c425d70f7e 100644 --- a/Documentation/DocBook/gadget.tmpl +++ b/Documentation/DocBook/gadget.tmpl @@ -671,7 +671,7 @@ than a kernel driver. <para>There's a USB Mass Storage class driver, which provides a different solution for interoperability with systems such as MS-Windows and MacOS. -That <emphasis>File-backed Storage</emphasis> driver uses a +That <emphasis>Mass Storage</emphasis> driver uses a file or block device as backing store for a drive, like the <filename>loop</filename> driver. The USB host uses the BBB, CB, or CBI versions of the mass @@ -708,7 +708,7 @@ hardware level details could be very different. <para>Systems need specialized hardware support to implement OTG, notably including a special <emphasis>Mini-AB</emphasis> jack -and associated transciever to support <emphasis>Dual-Role</emphasis> +and associated transceiver to support <emphasis>Dual-Role</emphasis> operation: they can act either as a host, using the standard Linux-USB host side driver stack, diff --git a/Documentation/DocBook/genericirq.tmpl b/Documentation/DocBook/genericirq.tmpl index c671a016809..59fb5c07754 100644 --- a/Documentation/DocBook/genericirq.tmpl +++ b/Documentation/DocBook/genericirq.tmpl @@ -28,7 +28,7 @@ </authorgroup> <copyright> - <year>2005-2006</year> + <year>2005-2010</year> <holder>Thomas Gleixner</holder> </copyright> <copyright> @@ -87,7 +87,7 @@ <chapter id="rationale"> <title>Rationale</title> <para> - The original implementation of interrupt handling in Linux is using + The original implementation of interrupt handling in Linux uses the __do_IRQ() super-handler, which is able to deal with every type of interrupt logic. </para> @@ -100,6 +100,10 @@ <listitem><para>Edge type</para></listitem> <listitem><para>Simple type</para></listitem> </itemizedlist> + During the implementation we identified another type: + <itemizedlist> + <listitem><para>Fast EOI type</para></listitem> + </itemizedlist> In the SMP world of the __do_IRQ() super-handler another type was identified: <itemizedlist> @@ -107,19 +111,19 @@ </itemizedlist> </para> <para> - This split implementation of highlevel IRQ handlers allows us to + This split implementation of high-level IRQ handlers allows us to optimize the flow of the interrupt handling for each specific - interrupt type. This reduces complexity in that particular codepath + interrupt type. This reduces complexity in that particular code path and allows the optimized handling of a given type. </para> <para> The original general IRQ implementation used hw_interrupt_type structures and their ->ack(), ->end() [etc.] callbacks to differentiate the flow control in the super-handler. This leads to - a mix of flow logic and lowlevel hardware logic, and it also leads - to unnecessary code duplication: for example in i386, there is a - ioapic_level_irq and a ioapic_edge_irq irq-type which share many - of the lowlevel details but have different flow handling. + a mix of flow logic and low-level hardware logic, and it also leads + to unnecessary code duplication: for example in i386, there is an + ioapic_level_irq and an ioapic_edge_irq IRQ-type which share many + of the low-level details but have different flow handling. </para> <para> A more natural abstraction is the clean separation of the @@ -128,23 +132,23 @@ <para> Analysing a couple of architecture's IRQ subsystem implementations reveals that most of them can use a generic set of 'irq flow' - methods and only need to add the chip level specific code. + methods and only need to add the chip-level specific code. The separation is also valuable for (sub)architectures - which need specific quirks in the irq flow itself but not in the - chip-details - and thus provides a more transparent IRQ subsystem + which need specific quirks in the IRQ flow itself but not in the + chip details - and thus provides a more transparent IRQ subsystem design. </para> <para> - Each interrupt descriptor is assigned its own highlevel flow + Each interrupt descriptor is assigned its own high-level flow handler, which is normally one of the generic - implementations. (This highlevel flow handler implementation also + implementations. (This high-level flow handler implementation also makes it simple to provide demultiplexing handlers which can be found in embedded platforms on various architectures.) </para> <para> The separation makes the generic interrupt handling layer more flexible and extensible. For example, an (sub)architecture can - use a generic irq-flow implementation for 'level type' interrupts + use a generic IRQ-flow implementation for 'level type' interrupts and add a (sub)architecture specific 'edge type' implementation. </para> <para> @@ -153,6 +157,7 @@ is still available. This leads to a kind of duality for the time being. Over time the new model should be used in more and more architectures, as it enables smaller and cleaner IRQ subsystems. + It's deprecated for three years now and about to be removed. </para> </chapter> <chapter id="bugs"> @@ -167,9 +172,9 @@ <para> There are three main levels of abstraction in the interrupt code: <orderedlist> - <listitem><para>Highlevel driver API</para></listitem> - <listitem><para>Highlevel IRQ flow handlers</para></listitem> - <listitem><para>Chiplevel hardware encapsulation</para></listitem> + <listitem><para>High-level driver API</para></listitem> + <listitem><para>High-level IRQ flow handlers</para></listitem> + <listitem><para>Chip-level hardware encapsulation</para></listitem> </orderedlist> </para> <sect1 id="Interrupt_control_flow"> @@ -177,23 +182,23 @@ <para> Each interrupt is described by an interrupt descriptor structure irq_desc. The interrupt is referenced by an 'unsigned int' numeric - value which selects the corresponding interrupt decription structure + value which selects the corresponding interrupt description structure in the descriptor structures array. The descriptor structure contains status information and pointers to the interrupt flow method and the interrupt chip structure which are assigned to this interrupt. </para> <para> - Whenever an interrupt triggers, the lowlevel arch code calls into - the generic interrupt code by calling desc->handle_irq(). - This highlevel IRQ handling function only uses desc->chip primitives - referenced by the assigned chip descriptor structure. + Whenever an interrupt triggers, the low-level architecture code calls + into the generic interrupt code by calling desc->handle_irq(). + This high-level IRQ handling function only uses desc->irq_data.chip + primitives referenced by the assigned chip descriptor structure. </para> </sect1> <sect1 id="Highlevel_Driver_API"> - <title>Highlevel Driver API</title> + <title>High-level Driver API</title> <para> - The highlevel Driver API consists of following functions: + The high-level Driver API consists of following functions: <itemizedlist> <listitem><para>request_irq()</para></listitem> <listitem><para>free_irq()</para></listitem> @@ -201,26 +206,29 @@ <listitem><para>enable_irq()</para></listitem> <listitem><para>disable_irq_nosync() (SMP only)</para></listitem> <listitem><para>synchronize_irq() (SMP only)</para></listitem> - <listitem><para>set_irq_type()</para></listitem> - <listitem><para>set_irq_wake()</para></listitem> - <listitem><para>set_irq_data()</para></listitem> - <listitem><para>set_irq_chip()</para></listitem> - <listitem><para>set_irq_chip_data()</para></listitem> + <listitem><para>irq_set_irq_type()</para></listitem> + <listitem><para>irq_set_irq_wake()</para></listitem> + <listitem><para>irq_set_handler_data()</para></listitem> + <listitem><para>irq_set_chip()</para></listitem> + <listitem><para>irq_set_chip_data()</para></listitem> </itemizedlist> See the autogenerated function documentation for details. </para> </sect1> <sect1 id="Highlevel_IRQ_flow_handlers"> - <title>Highlevel IRQ flow handlers</title> + <title>High-level IRQ flow handlers</title> <para> The generic layer provides a set of pre-defined irq-flow methods: <itemizedlist> <listitem><para>handle_level_irq</para></listitem> <listitem><para>handle_edge_irq</para></listitem> + <listitem><para>handle_fasteoi_irq</para></listitem> <listitem><para>handle_simple_irq</para></listitem> <listitem><para>handle_percpu_irq</para></listitem> + <listitem><para>handle_edge_eoi_irq</para></listitem> + <listitem><para>handle_bad_irq</para></listitem> </itemizedlist> - The interrupt flow handlers (either predefined or architecture + The interrupt flow handlers (either pre-defined or architecture specific) are assigned to specific interrupts by the architecture either during bootup or during device initialization. </para> @@ -233,33 +241,33 @@ are used by the default flow implementations. The following helper functions are implemented (simplified excerpt): <programlisting> -default_enable(irq) +default_enable(struct irq_data *data) { - desc->chip->unmask(irq); + desc->irq_data.chip->irq_unmask(data); } -default_disable(irq) +default_disable(struct irq_data *data) { - if (!delay_disable(irq)) - desc->chip->mask(irq); + if (!delay_disable(data)) + desc->irq_data.chip->irq_mask(data); } -default_ack(irq) +default_ack(struct irq_data *data) { - chip->ack(irq); + chip->irq_ack(data); } -default_mask_ack(irq) +default_mask_ack(struct irq_data *data) { - if (chip->mask_ack) { - chip->mask_ack(irq); + if (chip->irq_mask_ack) { + chip->irq_mask_ack(data); } else { - chip->mask(irq); - chip->ack(irq); + chip->irq_mask(data); + chip->irq_ack(data); } } -noop(irq) +noop(struct irq_data *data)) { } @@ -278,12 +286,27 @@ noop(irq) <para> The following control flow is implemented (simplified excerpt): <programlisting> -desc->chip->start(); -handle_IRQ_event(desc->action); -desc->chip->end(); +desc->irq_data.chip->irq_mask_ack(); +handle_irq_event(desc->action); +desc->irq_data.chip->irq_unmask(); </programlisting> </para> - </sect3> + </sect3> + <sect3 id="Default_FASTEOI_IRQ_flow_handler"> + <title>Default Fast EOI IRQ flow handler</title> + <para> + handle_fasteoi_irq provides a generic implementation + for interrupts, which only need an EOI at the end of + the handler. + </para> + <para> + The following control flow is implemented (simplified excerpt): + <programlisting> +handle_irq_event(desc->action); +desc->irq_data.chip->irq_eoi(); + </programlisting> + </para> + </sect3> <sect3 id="Default_Edge_IRQ_flow_handler"> <title>Default Edge IRQ flow handler</title> <para> @@ -294,20 +317,19 @@ desc->chip->end(); The following control flow is implemented (simplified excerpt): <programlisting> if (desc->status & running) { - desc->chip->hold(); + desc->irq_data.chip->irq_mask_ack(); desc->status |= pending | masked; return; } -desc->chip->start(); +desc->irq_data.chip->irq_ack(); desc->status |= running; do { if (desc->status & masked) - desc->chip->enable(); + desc->irq_data.chip->irq_unmask(); desc->status &= ~pending; - handle_IRQ_event(desc->action); + handle_irq_event(desc->action); } while (status & pending); desc->status &= ~running; -desc->chip->end(); </programlisting> </para> </sect3> @@ -324,7 +346,7 @@ desc->chip->end(); <para> The following control flow is implemented (simplified excerpt): <programlisting> -handle_IRQ_event(desc->action); +handle_irq_event(desc->action); </programlisting> </para> </sect3> @@ -342,12 +364,29 @@ handle_IRQ_event(desc->action); <para> The following control flow is implemented (simplified excerpt): <programlisting> -desc->chip->start(); -handle_IRQ_event(desc->action); -desc->chip->end(); +if (desc->irq_data.chip->irq_ack) + desc->irq_data.chip->irq_ack(); +handle_irq_event(desc->action); +if (desc->irq_data.chip->irq_eoi) + desc->irq_data.chip->irq_eoi(); </programlisting> </para> </sect3> + <sect3 id="EOI_Edge_IRQ_flow_handler"> + <title>EOI Edge IRQ flow handler</title> + <para> + handle_edge_eoi_irq provides an abnomination of the edge + handler which is solely used to tame a badly wreckaged + irq controller on powerpc/cell. + </para> + </sect3> + <sect3 id="BAD_IRQ_flow_handler"> + <title>Bad IRQ flow handler</title> + <para> + handle_bad_irq is used for spurious interrupts which + have no real handler assigned.. + </para> + </sect3> </sect2> <sect2 id="Quirks_and_optimizations"> <title>Quirks and optimizations</title> @@ -355,7 +394,7 @@ desc->chip->end(); The generic functions are intended for 'clean' architectures and chips, which have no platform-specific IRQ handling quirks. If an architecture needs to implement quirks on the 'flow' level then it can do so by - overriding the highlevel irq-flow handler. + overriding the high-level irq-flow handler. </para> </sect2> <sect2 id="Delayed_interrupt_disable"> @@ -375,29 +414,29 @@ desc->chip->end(); mechanism. (It's necessary to enable CONFIG_HARDIRQS_SW_RESEND when you want to use the delayed interrupt disable feature and your hardware is not capable of retriggering an interrupt.) - The delayed interrupt disable can be runtime enabled, per interrupt, - by setting the IRQ_DELAYED_DISABLE flag in the irq_desc status field. + The delayed interrupt disable is not configurable. </para> </sect2> </sect1> <sect1 id="Chiplevel_hardware_encapsulation"> - <title>Chiplevel hardware encapsulation</title> + <title>Chip-level hardware encapsulation</title> <para> - The chip level hardware descriptor structure irq_chip + The chip-level hardware descriptor structure irq_chip contains all the direct chip relevant functions, which can be utilized by the irq flow implementations. <itemizedlist> - <listitem><para>ack()</para></listitem> - <listitem><para>mask_ack() - Optional, recommended for performance</para></listitem> - <listitem><para>mask()</para></listitem> - <listitem><para>unmask()</para></listitem> - <listitem><para>retrigger() - Optional</para></listitem> - <listitem><para>set_type() - Optional</para></listitem> - <listitem><para>set_wake() - Optional</para></listitem> + <listitem><para>irq_ack()</para></listitem> + <listitem><para>irq_mask_ack() - Optional, recommended for performance</para></listitem> + <listitem><para>irq_mask()</para></listitem> + <listitem><para>irq_unmask()</para></listitem> + <listitem><para>irq_eoi() - Optional, required for EOI flow handlers</para></listitem> + <listitem><para>irq_retrigger() - Optional</para></listitem> + <listitem><para>irq_set_type() - Optional</para></listitem> + <listitem><para>irq_set_wake() - Optional</para></listitem> </itemizedlist> These primitives are strictly intended to mean what they say: ack means ACK, masking means masking of an IRQ line, etc. It is up to the flow - handler(s) to use these basic units of lowlevel functionality. + handler(s) to use these basic units of low-level functionality. </para> </sect1> </chapter> @@ -405,34 +444,39 @@ desc->chip->end(); <chapter id="doirq"> <title>__do_IRQ entry point</title> <para> - The original implementation __do_IRQ() is an alternative entry - point for all types of interrupts. + The original implementation __do_IRQ() was an alternative entry + point for all types of interrupts. It no longer exists. </para> <para> This handler turned out to be not suitable for all interrupt hardware and was therefore reimplemented with split - functionality for egde/level/simple/percpu interrupts. This is not + functionality for edge/level/simple/percpu interrupts. This is not only a functional optimization. It also shortens code paths for interrupts. </para> - <para> - To make use of the split implementation, replace the call to - __do_IRQ by a call to desc->chip->handle_irq() and associate - the appropriate handler function to desc->chip->handle_irq(). - In most cases the generic handler implementations should - be sufficient. - </para> </chapter> <chapter id="locking"> <title>Locking on SMP</title> <para> The locking of chip registers is up to the architecture that - defines the chip primitives. There is a chip->lock field that can be used - for serialization, but the generic layer does not touch it. The per-irq - structure is protected via desc->lock, by the generic layer. + defines the chip primitives. The per-irq structure is + protected via desc->lock, by the generic layer. + </para> + </chapter> + + <chapter id="genericchip"> + <title>Generic interrupt chip</title> + <para> + To avoid copies of identical implementations of IRQ chips the + core provides a configurable generic interrupt chip + implementation. Developers should check carefully whether the + generic chip fits their needs before implementing the same + functionality slightly differently themselves. </para> +!Ekernel/irq/generic-chip.c </chapter> + <chapter id="structs"> <title>Structures</title> <para> @@ -458,6 +502,7 @@ desc->chip->end(); <para> This chapter contains the autogenerated documentation of the internal functions. </para> +!Ikernel/irq/irqdesc.c !Ikernel/irq/handle.c !Ikernel/irq/chip.c </chapter> diff --git a/Documentation/DocBook/kernel-api.tmpl b/Documentation/DocBook/kernel-api.tmpl index 44b3def961a..ecfd0ea4066 100644 --- a/Documentation/DocBook/kernel-api.tmpl +++ b/Documentation/DocBook/kernel-api.tmpl @@ -57,8 +57,10 @@ </para> <sect1><title>String Conversions</title> -!Ilib/vsprintf.c !Elib/vsprintf.c +!Finclude/linux/kernel.h kstrtol +!Finclude/linux/kernel.h kstrtoul +!Elib/kstrtox.c </sect1> <sect1><title>String Manipulation</title> <!-- All functions are exported at now @@ -94,6 +96,12 @@ X!Ilib/string.c !Elib/crc32.c !Elib/crc-ccitt.c </sect1> + + <sect1 id="idr"><title>idr/ida Functions</title> +!Pinclude/linux/idr.h idr sync +!Plib/idr.c IDA description +!Elib/idr.c + </sect1> </chapter> <chapter id="mm"> @@ -101,6 +109,7 @@ X!Ilib/string.c <sect1><title>The Slab Cache</title> !Iinclude/linux/slab.h !Emm/slab.c +!Emm/util.c </sect1> <sect1><title>User Space Memory Access</title> !Iarch/x86/include/asm/uaccess_32.h @@ -132,7 +141,6 @@ X!Ilib/string.c <title>FIFO Buffer</title> <sect1><title>kfifo interface</title> !Iinclude/linux/kfifo.h -!Ekernel/kfifo.c </sect1> </chapter> @@ -208,19 +216,6 @@ X!Edrivers/pci/hotplug.c <sect1><title>PCI Hotplug Support Library</title> !Edrivers/pci/hotplug/pci_hotplug_core.c </sect1> - <sect1><title>MCA Architecture</title> - <sect2><title>MCA Device Functions</title> - <para> - Refer to the file arch/x86/kernel/mca_32.c for more information. - </para> -<!-- FIXME: Removed for now since no structured comments in source -X!Earch/x86/kernel/mca_32.c ---> - </sect2> - <sect2><title>MCA Bus DMA</title> -!Iarch/x86/include/asm/mca_dma.h - </sect2> - </sect1> </chapter> <chapter id="firmware"> @@ -259,7 +254,8 @@ X!Earch/x86/kernel/mca_32.c !Iblock/blk-sysfs.c !Eblock/blk-settings.c !Eblock/blk-exec.c -!Eblock/blk-barrier.c +!Eblock/blk-flush.c +!Eblock/blk-lib.c !Eblock/blk-tag.c !Iblock/blk-tag.c !Eblock/blk-integrity.c diff --git a/Documentation/DocBook/kernel-hacking.tmpl b/Documentation/DocBook/kernel-hacking.tmpl index a50d6cd5857..e84f09467cd 100644 --- a/Documentation/DocBook/kernel-hacking.tmpl +++ b/Documentation/DocBook/kernel-hacking.tmpl @@ -352,7 +352,7 @@ asmlinkage long sys_mycall(int arg) </para> <programlisting> -if (signal_pending()) +if (signal_pending(current)) return -ERESTARTSYS; </programlisting> @@ -409,7 +409,7 @@ cond_resched(); /* Will sleep */ <para> You should always compile your kernel - <symbol>CONFIG_DEBUG_SPINLOCK_SLEEP</symbol> on, and it will warn + <symbol>CONFIG_DEBUG_ATOMIC_SLEEP</symbol> on, and it will warn you if you break these rules. If you <emphasis>do</emphasis> break the rules, you will eventually lock up your box. </para> @@ -449,8 +449,8 @@ printk(KERN_INFO "i = %u\n", i); </para> <programlisting> -__u32 ipaddress; -printk(KERN_INFO "my ip: %d.%d.%d.%d\n", NIPQUAD(ipaddress)); +__be32 ipaddress; +printk(KERN_INFO "my ip: %pI4\n", &ipaddress); </programlisting> <para> @@ -671,7 +671,7 @@ printk(KERN_INFO "my ip: %d.%d.%d.%d\n", NIPQUAD(ipaddress)); <sect1 id="routines-local-irqs"> <title><function>local_irq_save()</function>/<function>local_irq_restore()</function> - <filename class="headerfile">include/asm/system.h</filename> + <filename class="headerfile">include/linux/irqflags.h</filename> </title> <para> @@ -850,16 +850,6 @@ printk(KERN_INFO "my ip: %d.%d.%d.%d\n", NIPQUAD(ipaddress)); <returnvalue>-ERESTARTSYS</returnvalue> if a signal is received. The <function>wait_event()</function> version ignores signals. </para> - <para> - Do not use the <function>sleep_on()</function> function family - - it is very easy to accidentally introduce races; almost certainly - one of the <function>wait_event()</function> family will do, or a - loop around <function>schedule_timeout()</function>. If you choose - to loop around <function>schedule_timeout()</function> remember - you must set the task state (with - <function>set_current_state()</function>) on each iteration to avoid - busy-looping. - </para> </sect1> @@ -945,7 +935,7 @@ printk(KERN_INFO "my ip: %d.%d.%d.%d\n", NIPQUAD(ipaddress)); <sect1 id="sym-exportsymbols"> <title><function>EXPORT_SYMBOL()</function> - <filename class="headerfile">include/linux/module.h</filename></title> + <filename class="headerfile">include/linux/export.h</filename></title> <para> This is the classic method of exporting a symbol: dynamically @@ -955,7 +945,7 @@ printk(KERN_INFO "my ip: %d.%d.%d.%d\n", NIPQUAD(ipaddress)); <sect1 id="sym-exportsymbols-gpl"> <title><function>EXPORT_SYMBOL_GPL()</function> - <filename class="headerfile">include/linux/module.h</filename></title> + <filename class="headerfile">include/linux/export.h</filename></title> <para> Similar to <function>EXPORT_SYMBOL()</function> except that the @@ -1185,13 +1175,6 @@ static struct block_device_operations opt_fops = { </para> <para> - You may well want to make your CONFIG option only visible if - <symbol>CONFIG_EXPERIMENTAL</symbol> is enabled: this serves as a - warning to users. There many other fancy things you can do: see - the various <filename>Kconfig</filename> files for ideas. - </para> - - <para> In your description of the option, make sure you address both the expert user and the user who knows nothing about your feature. Mention incompatibilities and issues here. <emphasis> Definitely @@ -1289,7 +1272,7 @@ static struct block_device_operations opt_fops = { * Sparc assembly will do this to ya. */ C_LABEL(cputypvar): - .asciz "compatability" + .asciz "compatibility" /* Tested on SS-5, SS-10. Probably someone at Sun applied a spell-checker. */ .align 4 diff --git a/Documentation/DocBook/kernel-locking.tmpl b/Documentation/DocBook/kernel-locking.tmpl index 084f6ad7b7a..e584ee12a1e 100644 --- a/Documentation/DocBook/kernel-locking.tmpl +++ b/Documentation/DocBook/kernel-locking.tmpl @@ -1645,7 +1645,9 @@ the amount of locking which needs to be done. all the readers who were traversing the list when we deleted the element are finished. We use <function>call_rcu()</function> to register a callback which will actually destroy the object once - the readers are finished. + all pre-existing readers are finished. Alternatively, + <function>synchronize_rcu()</function> may be used to block until + all pre-existing are finished. </para> <para> But how does Read Copy Update know when the readers are @@ -1714,7 +1716,7 @@ the amount of locking which needs to be done. - object_put(obj); + list_del_rcu(&obj->list); cache_num--; -+ call_rcu(&obj->rcu, cache_delete_rcu, obj); ++ call_rcu(&obj->rcu, cache_delete_rcu); } /* Must be holding cache_lock */ @@ -1725,14 +1727,6 @@ the amount of locking which needs to be done. if (++cache_num > MAX_CACHE_SIZE) { struct object *i, *outcast = NULL; list_for_each_entry(i, &cache, list) { -@@ -85,6 +94,7 @@ - obj->popularity = 0; - atomic_set(&obj->refcnt, 1); /* The cache holds a reference */ - spin_lock_init(&obj->lock); -+ INIT_RCU_HEAD(&obj->rcu); - - spin_lock_irqsave(&cache_lock, flags); - __cache_add(obj); @@ -104,12 +114,11 @@ struct object *cache_find(int id) { @@ -1766,10 +1760,10 @@ as it would be on UP. </para> <para> -There is a furthur optimization possible here: remember our original +There is a further optimization possible here: remember our original cache code, where there were no reference counts and the caller simply held the lock whenever using the object? This is still possible: if -you hold the lock, noone can delete the object, so you don't need to +you hold the lock, no one can delete the object, so you don't need to get and put the reference count. </para> @@ -1922,9 +1916,12 @@ machines due to caching. <function>mutex_lock()</function> </para> <para> - There is a <function>mutex_trylock()</function> which can be - used inside interrupt context, as it will not sleep. + There is a <function>mutex_trylock()</function> which does not + sleep. Still, it must not be used inside interrupt context since + its implementation is not safe for that. <function>mutex_unlock()</function> will also never sleep. + It cannot be used in interrupt context either since a mutex + must be released by the same task that acquired it. </para> </listitem> </itemizedlist> @@ -1958,6 +1955,17 @@ machines due to caching. </sect1> </chapter> + <chapter id="apiref-mutex"> + <title>Mutex API reference</title> +!Iinclude/linux/mutex.h +!Ekernel/locking/mutex.c + </chapter> + + <chapter id="apiref-futex"> + <title>Futex API reference</title> +!Ikernel/futex.c + </chapter> + <chapter id="references"> <title>Further reading</title> diff --git a/Documentation/DocBook/kgdb.tmpl b/Documentation/DocBook/kgdb.tmpl index 5cff41a5fa7..f77358f9693 100644 --- a/Documentation/DocBook/kgdb.tmpl +++ b/Documentation/DocBook/kgdb.tmpl @@ -4,7 +4,7 @@ <book id="kgdbOnLinux"> <bookinfo> - <title>Using kgdb and the kgdb Internals</title> + <title>Using kgdb, kdb and the kernel debugger internals</title> <authorgroup> <author> @@ -17,33 +17,8 @@ </affiliation> </author> </authorgroup> - - <authorgroup> - <author> - <firstname>Tom</firstname> - <surname>Rini</surname> - <affiliation> - <address> - <email>trini@kernel.crashing.org</email> - </address> - </affiliation> - </author> - </authorgroup> - - <authorgroup> - <author> - <firstname>Amit S.</firstname> - <surname>Kale</surname> - <affiliation> - <address> - <email>amitkale@linsyssoft.com</email> - </address> - </affiliation> - </author> - </authorgroup> - <copyright> - <year>2008</year> + <year>2008,2010</year> <holder>Wind River Systems, Inc.</holder> </copyright> <copyright> @@ -69,41 +44,74 @@ <chapter id="Introduction"> <title>Introduction</title> <para> - kgdb is a source level debugger for linux kernel. It is used along - with gdb to debug a linux kernel. The expectation is that gdb can - be used to "break in" to the kernel to inspect memory, variables - and look through call stack information similar to what an - application developer would use gdb for. It is possible to place - breakpoints in kernel code and perform some limited execution - stepping. + The kernel has two different debugger front ends (kdb and kgdb) + which interface to the debug core. It is possible to use either + of the debugger front ends and dynamically transition between them + if you configure the kernel properly at compile and runtime. + </para> + <para> + Kdb is simplistic shell-style interface which you can use on a + system console with a keyboard or serial console. You can use it + to inspect memory, registers, process lists, dmesg, and even set + breakpoints to stop in a certain location. Kdb is not a source + level debugger, although you can set breakpoints and execute some + basic kernel run control. Kdb is mainly aimed at doing some + analysis to aid in development or diagnosing kernel problems. You + can access some symbols by name in kernel built-ins or in kernel + modules if the code was built + with <symbol>CONFIG_KALLSYMS</symbol>. + </para> + <para> + Kgdb is intended to be used as a source level debugger for the + Linux kernel. It is used along with gdb to debug a Linux kernel. + The expectation is that gdb can be used to "break in" to the + kernel to inspect memory, variables and look through call stack + information similar to the way an application developer would use + gdb to debug an application. It is possible to place breakpoints + in kernel code and perform some limited execution stepping. </para> <para> - Two machines are required for using kgdb. One of these machines is a - development machine and the other is a test machine. The kernel - to be debugged runs on the test machine. The development machine - runs an instance of gdb against the vmlinux file which contains - the symbols (not boot image such as bzImage, zImage, uImage...). - In gdb the developer specifies the connection parameters and - connects to kgdb. The type of connection a developer makes with - gdb depends on the availability of kgdb I/O modules compiled as - builtin's or kernel modules in the test machine's kernel. + Two machines are required for using kgdb. One of these machines is + a development machine and the other is the target machine. The + kernel to be debugged runs on the target machine. The development + machine runs an instance of gdb against the vmlinux file which + contains the symbols (not boot image such as bzImage, zImage, + uImage...). In gdb the developer specifies the connection + parameters and connects to kgdb. The type of connection a + developer makes with gdb depends on the availability of kgdb I/O + modules compiled as built-ins or loadable kernel modules in the test + machine's kernel. </para> </chapter> <chapter id="CompilingAKernel"> - <title>Compiling a kernel</title> + <title>Compiling a kernel</title> + <para> + <itemizedlist> + <listitem><para>In order to enable compilation of kdb, you must first enable kgdb.</para></listitem> + <listitem><para>The kgdb test compile options are described in the kgdb test suite chapter.</para></listitem> + </itemizedlist> + </para> + <sect1 id="CompileKGDB"> + <title>Kernel config options for kgdb</title> + <para> + To enable <symbol>CONFIG_KGDB</symbol> you should look under + "Kernel debugging" and select "KGDB: kernel debugger". + </para> <para> - To enable <symbol>CONFIG_KGDB</symbol> you should first turn on - "Prompt for development and/or incomplete code/drivers" - (CONFIG_EXPERIMENTAL) in "General setup", then under the - "Kernel debugging" select "KGDB: kernel debugging with remote gdb". + While it is not a hard requirement that you have symbols in your + vmlinux file, gdb tends not to be very useful without the symbolic + data, so you will want to turn + on <symbol>CONFIG_DEBUG_INFO</symbol> which is called "Compile the + kernel with debug info" in the config menu. </para> <para> It is advised, but not required that you turn on the - CONFIG_FRAME_POINTER kernel option. This option inserts code to - into the compiled executable which saves the frame information in - registers or on the stack at different points which will allow a - debugger such as gdb to more accurately construct stack back traces - while debugging the kernel. + <symbol>CONFIG_FRAME_POINTER</symbol> kernel option which is called "Compile the + kernel with frame pointers" in the config menu. This option + inserts code to into the compiled executable which saves the frame + information in registers or on the stack at different points which + allows a debugger such as gdb to more accurately construct + stack back traces while debugging the kernel. </para> <para> If the architecture that you are using supports the kernel option @@ -116,38 +124,192 @@ this option. </para> <para> - Next you should choose one of more I/O drivers to interconnect debugging - host and debugged target. Early boot debugging requires a KGDB - I/O driver that supports early debugging and the driver must be - built into the kernel directly. Kgdb I/O driver configuration - takes place via kernel or module parameters, see following - chapter. + Next you should choose one of more I/O drivers to interconnect + debugging host and debugged target. Early boot debugging requires + a KGDB I/O driver that supports early debugging and the driver + must be built into the kernel directly. Kgdb I/O driver + configuration takes place via kernel or module parameters which + you can learn more about in the in the section that describes the + parameter "kgdboc". </para> - <para> - The kgdb test compile options are described in the kgdb test suite chapter. + <para>Here is an example set of .config symbols to enable or + disable for kgdb: + <itemizedlist> + <listitem><para># CONFIG_DEBUG_RODATA is not set</para></listitem> + <listitem><para>CONFIG_FRAME_POINTER=y</para></listitem> + <listitem><para>CONFIG_KGDB=y</para></listitem> + <listitem><para>CONFIG_KGDB_SERIAL_CONSOLE=y</para></listitem> + </itemizedlist> </para> - + </sect1> + <sect1 id="CompileKDB"> + <title>Kernel config options for kdb</title> + <para>Kdb is quite a bit more complex than the simple gdbstub + sitting on top of the kernel's debug core. Kdb must implement a + shell, and also adds some helper functions in other parts of the + kernel, responsible for printing out interesting data such as what + you would see if you ran "lsmod", or "ps". In order to build kdb + into the kernel you follow the same steps as you would for kgdb. + </para> + <para>The main config option for kdb + is <symbol>CONFIG_KGDB_KDB</symbol> which is called "KGDB_KDB: + include kdb frontend for kgdb" in the config menu. In theory you + would have already also selected an I/O driver such as the + CONFIG_KGDB_SERIAL_CONSOLE interface if you plan on using kdb on a + serial port, when you were configuring kgdb. + </para> + <para>If you want to use a PS/2-style keyboard with kdb, you would + select CONFIG_KDB_KEYBOARD which is called "KGDB_KDB: keyboard as + input device" in the config menu. The CONFIG_KDB_KEYBOARD option + is not used for anything in the gdb interface to kgdb. The + CONFIG_KDB_KEYBOARD option only works with kdb. + </para> + <para>Here is an example set of .config symbols to enable/disable kdb: + <itemizedlist> + <listitem><para># CONFIG_DEBUG_RODATA is not set</para></listitem> + <listitem><para>CONFIG_FRAME_POINTER=y</para></listitem> + <listitem><para>CONFIG_KGDB=y</para></listitem> + <listitem><para>CONFIG_KGDB_SERIAL_CONSOLE=y</para></listitem> + <listitem><para>CONFIG_KGDB_KDB=y</para></listitem> + <listitem><para>CONFIG_KDB_KEYBOARD=y</para></listitem> + </itemizedlist> + </para> + </sect1> </chapter> - <chapter id="EnableKGDB"> - <title>Enable kgdb for debugging</title> - <para> - In order to use kgdb you must activate it by passing configuration - information to one of the kgdb I/O drivers. If you do not pass any - configuration information kgdb will not do anything at all. Kgdb - will only actively hook up to the kernel trap hooks if a kgdb I/O - driver is loaded and configured. If you unconfigure a kgdb I/O - driver, kgdb will unregister all the kernel hook points. + <chapter id="kgdbKernelArgs"> + <title>Kernel Debugger Boot Arguments</title> + <para>This section describes the various runtime kernel + parameters that affect the configuration of the kernel debugger. + The following chapter covers using kdb and kgdb as well as + provides some examples of the configuration parameters.</para> + <sect1 id="kgdboc"> + <title>Kernel parameter: kgdboc</title> + <para>The kgdboc driver was originally an abbreviation meant to + stand for "kgdb over console". Today it is the primary mechanism + to configure how to communicate from gdb to kgdb as well as the + devices you want to use to interact with the kdb shell. + </para> + <para>For kgdb/gdb, kgdboc is designed to work with a single serial + port. It is intended to cover the circumstance where you want to + use a serial console as your primary console as well as using it to + perform kernel debugging. It is also possible to use kgdb on a + serial port which is not designated as a system console. Kgdboc + may be configured as a kernel built-in or a kernel loadable module. + You can only make use of <constant>kgdbwait</constant> and early + debugging if you build kgdboc into the kernel as a built-in. + <para>Optionally you can elect to activate kms (Kernel Mode + Setting) integration. When you use kms with kgdboc and you have a + video driver that has atomic mode setting hooks, it is possible to + enter the debugger on the graphics console. When the kernel + execution is resumed, the previous graphics mode will be restored. + This integration can serve as a useful tool to aid in diagnosing + crashes or doing analysis of memory with kdb while allowing the + full graphics console applications to run. + </para> + </para> + <sect2 id="kgdbocArgs"> + <title>kgdboc arguments</title> + <para>Usage: <constant>kgdboc=[kms][[,]kbd][[,]serial_device][,baud]</constant></para> + <para>The order listed above must be observed if you use any of the + optional configurations together. </para> + <para>Abbreviations: + <itemizedlist> + <listitem><para>kms = Kernel Mode Setting</para></listitem> + <listitem><para>kbd = Keyboard</para></listitem> + </itemizedlist> + </para> + <para>You can configure kgdboc to use the keyboard, and or a serial + device depending on if you are using kdb and or kgdb, in one of the + following scenarios. The order listed above must be observed if + you use any of the optional configurations together. Using kms + + only gdb is generally not a useful combination.</para> + <sect3 id="kgdbocArgs1"> + <title>Using loadable module or built-in</title> <para> - All drivers can be reconfigured at run time, if - <symbol>CONFIG_SYSFS</symbol> and <symbol>CONFIG_MODULES</symbol> - are enabled, by echo'ing a new config string to - <constant>/sys/module/<driver>/parameter/<option></constant>. - The driver can be unconfigured by passing an empty string. You cannot - change the configuration while the debugger is attached. Make sure - to detach the debugger with the <constant>detach</constant> command - prior to trying unconfigure a kgdb I/O driver. + <orderedlist> + <listitem><para>As a kernel built-in:</para> + <para>Use the kernel boot argument: <constant>kgdboc=<tty-device>,[baud]</constant></para></listitem> + <listitem> + <para>As a kernel loadable module:</para> + <para>Use the command: <constant>modprobe kgdboc kgdboc=<tty-device>,[baud]</constant></para> + <para>Here are two examples of how you might format the kgdboc + string. The first is for an x86 target using the first serial port. + The second example is for the ARM Versatile AB using the second + serial port. + <orderedlist> + <listitem><para><constant>kgdboc=ttyS0,115200</constant></para></listitem> + <listitem><para><constant>kgdboc=ttyAMA1,115200</constant></para></listitem> + </orderedlist> + </para> + </listitem> + </orderedlist></para> + </sect3> + <sect3 id="kgdbocArgs2"> + <title>Configure kgdboc at runtime with sysfs</title> + <para>At run time you can enable or disable kgdboc by echoing a + parameters into the sysfs. Here are two examples:</para> + <orderedlist> + <listitem><para>Enable kgdboc on ttyS0</para> + <para><constant>echo ttyS0 > /sys/module/kgdboc/parameters/kgdboc</constant></para></listitem> + <listitem><para>Disable kgdboc</para> + <para><constant>echo "" > /sys/module/kgdboc/parameters/kgdboc</constant></para></listitem> + </orderedlist> + <para>NOTE: You do not need to specify the baud if you are + configuring the console on tty which is already configured or + open.</para> + </sect3> + <sect3 id="kgdbocArgs3"> + <title>More examples</title> + <para>You can configure kgdboc to use the keyboard, and or a serial + device depending on if you are using kdb and or kgdb, in one of the + following scenarios.</para> + <para>You can configure kgdboc to use the keyboard, and or a serial device + depending on if you are using kdb and or kgdb, in one of the + following scenarios. + <orderedlist> + <listitem><para>kdb and kgdb over only a serial port</para> + <para><constant>kgdboc=<serial_device>[,baud]</constant></para> + <para>Example: <constant>kgdboc=ttyS0,115200</constant></para> + </listitem> + <listitem><para>kdb and kgdb with keyboard and a serial port</para> + <para><constant>kgdboc=kbd,<serial_device>[,baud]</constant></para> + <para>Example: <constant>kgdboc=kbd,ttyS0,115200</constant></para> + </listitem> + <listitem><para>kdb with a keyboard</para> + <para><constant>kgdboc=kbd</constant></para> + </listitem> + <listitem><para>kdb with kernel mode setting</para> + <para><constant>kgdboc=kms,kbd</constant></para> + </listitem> + <listitem><para>kdb with kernel mode setting and kgdb over a serial port</para> + <para><constant>kgdboc=kms,kbd,ttyS0,115200</constant></para> + </listitem> + </orderedlist> + </para> + </sect3> + <para>NOTE: Kgdboc does not support interrupting the target via the + gdb remote protocol. You must manually send a sysrq-g unless you + have a proxy that splits console output to a terminal program. + A console proxy has a separate TCP port for the debugger and a separate + TCP port for the "human" console. The proxy can take care of sending + the sysrq-g for you. </para> + <para>When using kgdboc with no debugger proxy, you can end up + connecting the debugger at one of two entry points. If an + exception occurs after you have loaded kgdboc, a message should + print on the console stating it is waiting for the debugger. In + this case you disconnect your terminal program and then connect the + debugger in its place. If you want to interrupt the target system + and forcibly enter a debug session you have to issue a Sysrq + sequence and then type the letter <constant>g</constant>. Then + you disconnect the terminal session and connect gdb. Your options + if you don't like this are to hack gdb to send the sysrq-g for you + as well as on the initial connect, or to use a debugger proxy that + allows an unmodified gdb to do the debugging. + </para> + </sect2> + </sect1> <sect1 id="kgdbwait"> <title>Kernel parameter: kgdbwait</title> <para> @@ -162,103 +324,221 @@ </para> <para> The kernel will stop and wait as early as the I/O driver and - architecture will allow when you use this option. If you build the - kgdb I/O driver as a kernel module kgdbwait will not do anything. + architecture allows when you use this option. If you build the + kgdb I/O driver as a loadable kernel module kgdbwait will not do + anything. </para> </sect1> - <sect1 id="kgdboc"> - <title>Kernel parameter: kgdboc</title> - <para> - The kgdboc driver was originally an abbreviation meant to stand for - "kgdb over console". Kgdboc is designed to work with a single - serial port. It was meant to cover the circumstance - where you wanted to use a serial console as your primary console as - well as using it to perform kernel debugging. Of course you can - also use kgdboc without assigning a console to the same port. + <sect1 id="kgdbcon"> + <title>Kernel parameter: kgdbcon</title> + <para> The kgdbcon feature allows you to see printk() messages + inside gdb while gdb is connected to the kernel. Kdb does not make + use of the kgdbcon feature. + </para> + <para>Kgdb supports using the gdb serial protocol to send console + messages to the debugger when the debugger is connected and running. + There are two ways to activate this feature. + <orderedlist> + <listitem><para>Activate with the kernel command line option:</para> + <para><constant>kgdbcon</constant></para> + </listitem> + <listitem><para>Use sysfs before configuring an I/O driver</para> + <para> + <constant>echo 1 > /sys/module/kgdb/parameters/kgdb_use_con</constant> + </para> + <para> + NOTE: If you do this after you configure the kgdb I/O driver, the + setting will not take effect until the next point the I/O is + reconfigured. + </para> + </listitem> + </orderedlist> + <para>IMPORTANT NOTE: You cannot use kgdboc + kgdbcon on a tty that is an + active system console. An example incorrect usage is <constant>console=ttyS0,115200 kgdboc=ttyS0 kgdbcon</constant> + </para> + <para>It is possible to use this option with kgdboc on a tty that is not a system console. + </para> </para> - <sect2 id="UsingKgdboc"> - <title>Using kgdboc</title> - <para> - You can configure kgdboc via sysfs or a module or kernel boot line - parameter depending on if you build with CONFIG_KGDBOC as a module - or built-in. - <orderedlist> - <listitem><para>From the module load or build-in</para> - <para><constant>kgdboc=<tty-device>,[baud]</constant></para> + </sect1> + <sect1 id="kgdbreboot"> + <title>Run time parameter: kgdbreboot</title> + <para> The kgdbreboot feature allows you to change how the debugger + deals with the reboot notification. You have 3 choices for the + behavior. The default behavior is always set to 0.</para> + <orderedlist> + <listitem><para>echo -1 > /sys/module/debug_core/parameters/kgdbreboot</para> + <para>Ignore the reboot notification entirely.</para> + </listitem> + <listitem><para>echo 0 > /sys/module/debug_core/parameters/kgdbreboot</para> + <para>Send the detach message to any attached debugger client.</para> + </listitem> + <listitem><para>echo 1 > /sys/module/debug_core/parameters/kgdbreboot</para> + <para>Enter the debugger on reboot notify.</para> + </listitem> + </orderedlist> + </sect1> + </chapter> + <chapter id="usingKDB"> + <title>Using kdb</title> <para> - The example here would be if your console port was typically ttyS0, you would use something like <constant>kgdboc=ttyS0,115200</constant> or on the ARM Versatile AB you would likely use <constant>kgdboc=ttyAMA0,115200</constant> + </para> + <sect1 id="quickKDBserial"> + <title>Quick start for kdb on a serial port</title> + <para>This is a quick example of how to use kdb.</para> + <para><orderedlist> + <listitem><para>Boot kernel with arguments: + <itemizedlist> + <listitem><para><constant>console=ttyS0,115200 kgdboc=ttyS0,115200</constant></para></listitem> + </itemizedlist></para> + <para>OR</para> + <para>Configure kgdboc after the kernel booted; assuming you are using a serial port console: + <itemizedlist> + <listitem><para><constant>echo ttyS0 > /sys/module/kgdboc/parameters/kgdboc</constant></para></listitem> + </itemizedlist> </para> </listitem> - <listitem><para>From sysfs</para> - <para><constant>echo ttyS0 > /sys/module/kgdboc/parameters/kgdboc</constant></para> + <listitem><para>Enter the kernel debugger manually or by waiting for an oops or fault. There are several ways you can enter the kernel debugger manually; all involve using the sysrq-g, which means you must have enabled CONFIG_MAGIC_SYSRQ=y in your kernel config.</para> + <itemizedlist> + <listitem><para>When logged in as root or with a super user session you can run:</para> + <para><constant>echo g > /proc/sysrq-trigger</constant></para></listitem> + <listitem><para>Example using minicom 2.2</para> + <para>Press: <constant>Control-a</constant></para> + <para>Press: <constant>f</constant></para> + <para>Press: <constant>g</constant></para> </listitem> - </orderedlist> - </para> - <para> - NOTE: Kgdboc does not support interrupting the target via the - gdb remote protocol. You must manually send a sysrq-g unless you - have a proxy that splits console output to a terminal problem and - has a separate port for the debugger to connect to that sends the - sysrq-g for you. + <listitem><para>When you have telneted to a terminal server that supports sending a remote break</para> + <para>Press: <constant>Control-]</constant></para> + <para>Type in:<constant>send break</constant></para> + <para>Press: <constant>Enter</constant></para> + <para>Press: <constant>g</constant></para> + </listitem> + </itemizedlist> + </listitem> + <listitem><para>From the kdb prompt you can run the "help" command to see a complete list of the commands that are available.</para> + <para>Some useful commands in kdb include: + <itemizedlist> + <listitem><para>lsmod -- Shows where kernel modules are loaded</para></listitem> + <listitem><para>ps -- Displays only the active processes</para></listitem> + <listitem><para>ps A -- Shows all the processes</para></listitem> + <listitem><para>summary -- Shows kernel version info and memory usage</para></listitem> + <listitem><para>bt -- Get a backtrace of the current process using dump_stack()</para></listitem> + <listitem><para>dmesg -- View the kernel syslog buffer</para></listitem> + <listitem><para>go -- Continue the system</para></listitem> + </itemizedlist> </para> - <para>When using kgdboc with no debugger proxy, you can end up - connecting the debugger for one of two entry points. If an - exception occurs after you have loaded kgdboc a message should print - on the console stating it is waiting for the debugger. In case you - disconnect your terminal program and then connect the debugger in - its place. If you want to interrupt the target system and forcibly - enter a debug session you have to issue a Sysrq sequence and then - type the letter <constant>g</constant>. Then you disconnect the - terminal session and connect gdb. Your options if you don't like - this are to hack gdb to send the sysrq-g for you as well as on the - initial connect, or to use a debugger proxy that allows an - unmodified gdb to do the debugging. + </listitem> + <listitem> + <para>When you are done using kdb you need to consider rebooting the + system or using the "go" command to resuming normal kernel + execution. If you have paused the kernel for a lengthy period of + time, applications that rely on timely networking or anything to do + with real wall clock time could be adversely affected, so you + should take this into consideration when using the kernel + debugger.</para> + </listitem> + </orderedlist></para> + </sect1> + <sect1 id="quickKDBkeyboard"> + <title>Quick start for kdb using a keyboard connected console</title> + <para>This is a quick example of how to use kdb with a keyboard.</para> + <para><orderedlist> + <listitem><para>Boot kernel with arguments: + <itemizedlist> + <listitem><para><constant>kgdboc=kbd</constant></para></listitem> + </itemizedlist></para> + <para>OR</para> + <para>Configure kgdboc after the kernel booted: + <itemizedlist> + <listitem><para><constant>echo kbd > /sys/module/kgdboc/parameters/kgdboc</constant></para></listitem> + </itemizedlist> </para> - </sect2> + </listitem> + <listitem><para>Enter the kernel debugger manually or by waiting for an oops or fault. There are several ways you can enter the kernel debugger manually; all involve using the sysrq-g, which means you must have enabled CONFIG_MAGIC_SYSRQ=y in your kernel config.</para> + <itemizedlist> + <listitem><para>When logged in as root or with a super user session you can run:</para> + <para><constant>echo g > /proc/sysrq-trigger</constant></para></listitem> + <listitem><para>Example using a laptop keyboard</para> + <para>Press and hold down: <constant>Alt</constant></para> + <para>Press and hold down: <constant>Fn</constant></para> + <para>Press and release the key with the label: <constant>SysRq</constant></para> + <para>Release: <constant>Fn</constant></para> + <para>Press and release: <constant>g</constant></para> + <para>Release: <constant>Alt</constant></para> + </listitem> + <listitem><para>Example using a PS/2 101-key keyboard</para> + <para>Press and hold down: <constant>Alt</constant></para> + <para>Press and release the key with the label: <constant>SysRq</constant></para> + <para>Press and release: <constant>g</constant></para> + <para>Release: <constant>Alt</constant></para> + </listitem> + </itemizedlist> + </listitem> + <listitem> + <para>Now type in a kdb command such as "help", "dmesg", "bt" or "go" to continue kernel execution.</para> + </listitem> + </orderedlist></para> </sect1> - <sect1 id="kgdbcon"> - <title>Kernel parameter: kgdbcon</title> - <para> - Kgdb supports using the gdb serial protocol to send console messages - to the debugger when the debugger is connected and running. There - are two ways to activate this feature. + </chapter> + <chapter id="EnableKGDB"> + <title>Using kgdb / gdb</title> + <para>In order to use kgdb you must activate it by passing + configuration information to one of the kgdb I/O drivers. If you + do not pass any configuration information kgdb will not do anything + at all. Kgdb will only actively hook up to the kernel trap hooks + if a kgdb I/O driver is loaded and configured. If you unconfigure + a kgdb I/O driver, kgdb will unregister all the kernel hook points. + </para> + <para> All kgdb I/O drivers can be reconfigured at run time, if + <symbol>CONFIG_SYSFS</symbol> and <symbol>CONFIG_MODULES</symbol> + are enabled, by echo'ing a new config string to + <constant>/sys/module/<driver>/parameter/<option></constant>. + The driver can be unconfigured by passing an empty string. You cannot + change the configuration while the debugger is attached. Make sure + to detach the debugger with the <constant>detach</constant> command + prior to trying to unconfigure a kgdb I/O driver. + </para> + <sect1 id="ConnectingGDB"> + <title>Connecting with gdb to a serial port</title> <orderedlist> - <listitem><para>Activate with the kernel command line option:</para> - <para><constant>kgdbcon</constant></para> + <listitem><para>Configure kgdboc</para> + <para>Boot kernel with arguments: + <itemizedlist> + <listitem><para><constant>kgdboc=ttyS0,115200</constant></para></listitem> + </itemizedlist></para> + <para>OR</para> + <para>Configure kgdboc after the kernel booted: + <itemizedlist> + <listitem><para><constant>echo ttyS0 > /sys/module/kgdboc/parameters/kgdboc</constant></para></listitem> + </itemizedlist></para> </listitem> - <listitem><para>Use sysfs before configuring an io driver</para> - <para> - <constant>echo 1 > /sys/module/kgdb/parameters/kgdb_use_con</constant> - </para> - <para> - NOTE: If you do this after you configure the kgdb I/O driver, the - setting will not take effect until the next point the I/O is - reconfigured. - </para> + <listitem> + <para>Stop kernel execution (break into the debugger)</para> + <para>In order to connect to gdb via kgdboc, the kernel must + first be stopped. There are several ways to stop the kernel which + include using kgdbwait as a boot argument, via a sysrq-g, or running + the kernel until it takes an exception where it waits for the + debugger to attach. + <itemizedlist> + <listitem><para>When logged in as root or with a super user session you can run:</para> + <para><constant>echo g > /proc/sysrq-trigger</constant></para></listitem> + <listitem><para>Example using minicom 2.2</para> + <para>Press: <constant>Control-a</constant></para> + <para>Press: <constant>f</constant></para> + <para>Press: <constant>g</constant></para> </listitem> - </orderedlist> - </para> - <para> - IMPORTANT NOTE: Using this option with kgdb over the console - (kgdboc) is not supported. + <listitem><para>When you have telneted to a terminal server that supports sending a remote break</para> + <para>Press: <constant>Control-]</constant></para> + <para>Type in:<constant>send break</constant></para> + <para>Press: <constant>Enter</constant></para> + <para>Press: <constant>g</constant></para> + </listitem> + </itemizedlist> </para> - </sect1> - </chapter> - <chapter id="ConnectingGDB"> - <title>Connecting gdb</title> - <para> - If you are using kgdboc, you need to have used kgdbwait as a boot - argument, issued a sysrq-g, or the system you are going to debug - has already taken an exception and is waiting for the debugger to - attach before you can connect gdb. - </para> - <para> - If you are not using different kgdb I/O driver other than kgdboc, - you should be able to connect and the target will automatically - respond. - </para> + </listitem> + <listitem> + <para>Connect from from gdb</para> <para> - Example (using a serial port): + Example (using a directly connected port): </para> <programlisting> % gdb ./vmlinux @@ -266,7 +546,7 @@ (gdb) target remote /dev/ttyS0 </programlisting> <para> - Example (kgdb to a terminal server on tcp port 2012): + Example (kgdb to a terminal server on TCP port 2012): </para> <programlisting> % gdb ./vmlinux @@ -283,6 +563,83 @@ communications. You do this prior to issuing the <constant>target remote</constant> command by typing in: <constant>set debug remote 1</constant> </para> + </listitem> + </orderedlist> + <para>Remember if you continue in gdb, and need to "break in" again, + you need to issue an other sysrq-g. It is easy to create a simple + entry point by putting a breakpoint at <constant>sys_sync</constant> + and then you can run "sync" from a shell or script to break into the + debugger.</para> + </sect1> + </chapter> + <chapter id="switchKdbKgdb"> + <title>kgdb and kdb interoperability</title> + <para>It is possible to transition between kdb and kgdb dynamically. + The debug core will remember which you used the last time and + automatically start in the same mode.</para> + <sect1> + <title>Switching between kdb and kgdb</title> + <sect2> + <title>Switching from kgdb to kdb</title> + <para> + There are two ways to switch from kgdb to kdb: you can use gdb to + issue a maintenance packet, or you can blindly type the command $3#33. + Whenever kernel debugger stops in kgdb mode it will print the + message <constant>KGDB or $3#33 for KDB</constant>. It is important + to note that you have to type the sequence correctly in one pass. + You cannot type a backspace or delete because kgdb will interpret + that as part of the debug stream. + <orderedlist> + <listitem><para>Change from kgdb to kdb by blindly typing:</para> + <para><constant>$3#33</constant></para></listitem> + <listitem><para>Change from kgdb to kdb with gdb</para> + <para><constant>maintenance packet 3</constant></para> + <para>NOTE: Now you must kill gdb. Typically you press control-z and + issue the command: kill -9 %</para></listitem> + </orderedlist> + </para> + </sect2> + <sect2> + <title>Change from kdb to kgdb</title> + <para>There are two ways you can change from kdb to kgdb. You can + manually enter kgdb mode by issuing the kgdb command from the kdb + shell prompt, or you can connect gdb while the kdb shell prompt is + active. The kdb shell looks for the typical first commands that gdb + would issue with the gdb remote protocol and if it sees one of those + commands it automatically changes into kgdb mode.</para> + <orderedlist> + <listitem><para>From kdb issue the command:</para> + <para><constant>kgdb</constant></para> + <para>Now disconnect your terminal program and connect gdb in its place</para></listitem> + <listitem><para>At the kdb prompt, disconnect the terminal program and connect gdb in its place.</para></listitem> + </orderedlist> + </sect2> + </sect1> + <sect1> + <title>Running kdb commands from gdb</title> + <para>It is possible to run a limited set of kdb commands from gdb, + using the gdb monitor command. You don't want to execute any of the + run control or breakpoint operations, because it can disrupt the + state of the kernel debugger. You should be using gdb for + breakpoints and run control operations if you have gdb connected. + The more useful commands to run are things like lsmod, dmesg, ps or + possibly some of the memory information commands. To see all the kdb + commands you can run <constant>monitor help</constant>.</para> + <para>Example: + <informalexample><programlisting> +(gdb) monitor ps +1 idle process (state I) and +27 sleeping system daemon (state M) processes suppressed, +use 'ps A' to see all. +Task Addr Pid Parent [*] cpu State Thread Command + +0xc78291d0 1 0 0 0 S 0xc7829404 init +0xc7954150 942 1 0 0 S 0xc7954384 dropbear +0xc78789c0 944 1 0 0 S 0xc7878bf4 sh +(gdb) + </programlisting></informalexample> + </para> + </sect1> </chapter> <chapter id="KGDBTestSuite"> <title>kgdb Test Suite</title> @@ -309,34 +666,38 @@ </para> </chapter> <chapter id="CommonBackEndReq"> - <title>KGDB Internals</title> + <title>Kernel Debugger Internals</title> <sect1 id="kgdbArchitecture"> <title>Architecture Specifics</title> <para> - Kgdb is organized into three basic components: + The kernel debugger is organized into a number of components: <orderedlist> - <listitem><para>kgdb core</para> + <listitem><para>The debug core</para> <para> - The kgdb core is found in kernel/kgdb.c. It contains: + The debug core is found in kernel/debugger/debug_core.c. It contains: <itemizedlist> - <listitem><para>All the logic to implement the gdb serial protocol</para></listitem> - <listitem><para>A generic OS exception handler which includes sync'ing the processors into a stopped state on an multi cpu system.</para></listitem> + <listitem><para>A generic OS exception handler which includes + sync'ing the processors into a stopped state on an multi-CPU + system.</para></listitem> <listitem><para>The API to talk to the kgdb I/O drivers</para></listitem> - <listitem><para>The API to make calls to the arch specific kgdb implementation</para></listitem> + <listitem><para>The API to make calls to the arch-specific kgdb implementation</para></listitem> <listitem><para>The logic to perform safe memory reads and writes to memory while using the debugger</para></listitem> <listitem><para>A full implementation for software breakpoints unless overridden by the arch</para></listitem> + <listitem><para>The API to invoke either the kdb or kgdb frontend to the debug core.</para></listitem> + <listitem><para>The structures and callback API for atomic kernel mode setting.</para> + <para>NOTE: kgdboc is where the kms callbacks are invoked.</para></listitem> </itemizedlist> </para> </listitem> - <listitem><para>kgdb arch specific implementation</para> + <listitem><para>kgdb arch-specific implementation</para> <para> This implementation is generally found in arch/*/kernel/kgdb.c. As an example, arch/x86/kernel/kgdb.c contains the specifics to implement HW breakpoint as well as the initialization to dynamically register and unregister for the trap handlers on - this architecture. The arch specific portion implements: + this architecture. The arch-specific portion implements: <itemizedlist> - <listitem><para>contains an arch specific trap catcher which + <listitem><para>contains an arch-specific trap catcher which invokes kgdb_handle_exception() to start kgdb about doing its work</para></listitem> <listitem><para>translation to and from gdb specific packet format to pt_regs</para></listitem> @@ -347,11 +708,46 @@ </itemizedlist> </para> </listitem> + <listitem><para>gdbstub frontend (aka kgdb)</para> + <para>The gdbstub is located in kernel/debug/gdbstub.c. It contains:</para> + <itemizedlist> + <listitem><para>All the logic to implement the gdb serial protocol</para></listitem> + </itemizedlist> + </listitem> + <listitem><para>kdb frontend</para> + <para>The kdb debugger shell is broken down into a number of + components. The kdb core is located in kernel/debug/kdb. There + are a number of helper functions in some of the other kernel + components to make it possible for kdb to examine and report + information about the kernel without taking locks that could + cause a kernel deadlock. The kdb core contains implements the following functionality.</para> + <itemizedlist> + <listitem><para>A simple shell</para></listitem> + <listitem><para>The kdb core command set</para></listitem> + <listitem><para>A registration API to register additional kdb shell commands.</para> + <itemizedlist> + <listitem><para>A good example of a self-contained kdb module + is the "ftdump" command for dumping the ftrace buffer. See: + kernel/trace/trace_kdb.c</para></listitem> + <listitem><para>For an example of how to dynamically register + a new kdb command you can build the kdb_hello.ko kernel module + from samples/kdb/kdb_hello.c. To build this example you can + set CONFIG_SAMPLES=y and CONFIG_SAMPLE_KDB=m in your kernel + config. Later run "modprobe kdb_hello" and the next time you + enter the kdb shell, you can run the "hello" + command.</para></listitem> + </itemizedlist></listitem> + <listitem><para>The implementation for kdb_printf() which + emits messages directly to I/O drivers, bypassing the kernel + log.</para></listitem> + <listitem><para>SW / HW breakpoint management for the kdb shell</para></listitem> + </itemizedlist> + </listitem> <listitem><para>kgdb I/O driver</para> <para> - Each kgdb I/O driver has to provide an implemenation for the following: + Each kgdb I/O driver has to provide an implementation for the following: <itemizedlist> - <listitem><para>configuration via builtin or module</para></listitem> + <listitem><para>configuration via built-in or module</para></listitem> <listitem><para>dynamic configuration and kgdb hook registration calls</para></listitem> <listitem><para>read and write character interface</para></listitem> <listitem><para>A cleanup handler for unconfiguring from the kgdb core</para></listitem> @@ -411,20 +807,19 @@ </sect1> <sect1 id="kgdbocDesign"> <title>kgdboc internals</title> + <sect2> + <title>kgdboc and uarts</title> <para> The kgdboc driver is actually a very thin driver that relies on the underlying low level to the hardware driver having "polling hooks" which the to which the tty driver is attached. In the initial implementation of kgdboc it the serial_core was changed to expose a - low level uart hook for doing polled mode reading and writing of a + low level UART hook for doing polled mode reading and writing of a single character while in an atomic context. When kgdb makes an I/O - request to the debugger, kgdboc invokes a call back in the serial - core which in turn uses the call back in the uart driver. It is - certainly possible to extend kgdboc to work with non-uart based - consoles in the future. - </para> + request to the debugger, kgdboc invokes a callback in the serial + core which in turn uses the callback in the UART driver.</para> <para> - When using kgdboc with a uart, the uart driver must implement two callbacks in the <constant>struct uart_ops</constant>. Example from drivers/8250.c:<programlisting> + When using kgdboc with a UART, the UART driver must implement two callbacks in the <constant>struct uart_ops</constant>. Example from drivers/8250.c:<programlisting> #ifdef CONFIG_CONSOLE_POLL .poll_get_char = serial8250_get_poll_char, .poll_put_char = serial8250_put_poll_char, @@ -434,11 +829,70 @@ <constant>#ifdef CONFIG_CONSOLE_POLL</constant>, as shown above. Keep in mind that polling hooks have to be implemented in such a way that they can be called from an atomic context and have to restore - the state of the uart chip on return such that the system can return + the state of the UART chip on return such that the system can return to normal when the debugger detaches. You need to be very careful - with any kind of lock you consider, because failing here is most + with any kind of lock you consider, because failing here is most likely going to mean pressing the reset button. </para> + </sect2> + <sect2 id="kgdbocKbd"> + <title>kgdboc and keyboards</title> + <para>The kgdboc driver contains logic to configure communications + with an attached keyboard. The keyboard infrastructure is only + compiled into the kernel when CONFIG_KDB_KEYBOARD=y is set in the + kernel configuration.</para> + <para>The core polled keyboard driver driver for PS/2 type keyboards + is in drivers/char/kdb_keyboard.c. This driver is hooked into the + debug core when kgdboc populates the callback in the array + called <constant>kdb_poll_funcs[]</constant>. The + kdb_get_kbd_char() is the top-level function which polls hardware + for single character input. + </para> + </sect2> + <sect2 id="kgdbocKms"> + <title>kgdboc and kms</title> + <para>The kgdboc driver contains logic to request the graphics + display to switch to a text context when you are using + "kgdboc=kms,kbd", provided that you have a video driver which has a + frame buffer console and atomic kernel mode setting support.</para> + <para> + Every time the kernel + debugger is entered it calls kgdboc_pre_exp_handler() which in turn + calls con_debug_enter() in the virtual console layer. On resuming kernel + execution, the kernel debugger calls kgdboc_post_exp_handler() which + in turn calls con_debug_leave().</para> + <para>Any video driver that wants to be compatible with the kernel + debugger and the atomic kms callbacks must implement the + mode_set_base_atomic, fb_debug_enter and fb_debug_leave operations. + For the fb_debug_enter and fb_debug_leave the option exists to use + the generic drm fb helper functions or implement something custom for + the hardware. The following example shows the initialization of the + .mode_set_base_atomic operation in + drivers/gpu/drm/i915/intel_display.c: + <informalexample> + <programlisting> +static const struct drm_crtc_helper_funcs intel_helper_funcs = { +[...] + .mode_set_base_atomic = intel_pipe_set_base_atomic, +[...] +}; + </programlisting> + </informalexample> + </para> + <para>Here is an example of how the i915 driver initializes the fb_debug_enter and fb_debug_leave functions to use the generic drm helpers in + drivers/gpu/drm/i915/intel_fb.c: + <informalexample> + <programlisting> +static struct fb_ops intelfb_ops = { +[...] + .fb_debug_enter = drm_fb_helper_debug_enter, + .fb_debug_leave = drm_fb_helper_debug_leave, +[...] +}; + </programlisting> + </informalexample> + </para> + </sect2> </sect1> </chapter> <chapter id="credits"> @@ -453,6 +907,10 @@ <itemizedlist> <listitem><para>Jason Wessel<email>jason.wessel@windriver.com</email></para></listitem> </itemizedlist> + In Jan 2010 this document was updated to include kdb. + <itemizedlist> + <listitem><para>Jason Wessel<email>jason.wessel@windriver.com</email></para></listitem> + </itemizedlist> </para> </chapter> </book> diff --git a/Documentation/DocBook/libata.tmpl b/Documentation/DocBook/libata.tmpl index ba997577150..d7fcdc5a437 100644 --- a/Documentation/DocBook/libata.tmpl +++ b/Documentation/DocBook/libata.tmpl @@ -22,8 +22,8 @@ <para> The contents of this file are subject to the Open Software License version 1.1 that can be found at - <ulink url="http://www.opensource.org/licenses/osl-1.1.txt">http://www.opensource.org/licenses/osl-1.1.txt</ulink> and is included herein - by reference. + <ulink url="http://fedoraproject.org/wiki/Licensing:OSL1.1">http://fedoraproject.org/wiki/Licensing:OSL1.1</ulink> + and is included herein by reference. </para> <para> @@ -81,16 +81,14 @@ void (*port_disable) (struct ata_port *); </programlisting> <para> - Called from ata_bus_probe() and ata_bus_reset() error paths, - as well as when unregistering from the SCSI module (rmmod, hot - unplug). + Called from ata_bus_probe() error path, as well as when + unregistering from the SCSI module (rmmod, hot unplug). This function should do whatever needs to be done to take the port out of use. In most cases, ata_port_disable() can be used as this hook. </para> <para> Called from ata_bus_probe() on a failed probe. - Called from ata_bus_reset() on a failed bus reset. Called from ata_scsi_release(). </para> @@ -107,10 +105,6 @@ void (*dev_config) (struct ata_port *, struct ata_device *); issue of SET FEATURES - XFER MODE, and prior to operation. </para> <para> - Called by ata_device_add() after ata_dev_identify() determines - a device is present. - </para> - <para> This entry may be specified as NULL in ata_port_operations. </para> @@ -154,8 +148,8 @@ unsigned int (*mode_filter) (struct ata_port *, struct ata_device *, unsigned in <sect2><title>Taskfile read/write</title> <programlisting> -void (*tf_load) (struct ata_port *ap, struct ata_taskfile *tf); -void (*tf_read) (struct ata_port *ap, struct ata_taskfile *tf); +void (*sff_tf_load) (struct ata_port *ap, struct ata_taskfile *tf); +void (*sff_tf_read) (struct ata_port *ap, struct ata_taskfile *tf); </programlisting> <para> @@ -164,36 +158,35 @@ void (*tf_read) (struct ata_port *ap, struct ata_taskfile *tf); hardware registers / DMA buffers, to obtain the current set of taskfile register values. Most drivers for taskfile-based hardware (PIO or MMIO) use - ata_tf_load() and ata_tf_read() for these hooks. + ata_sff_tf_load() and ata_sff_tf_read() for these hooks. </para> </sect2> <sect2><title>PIO data read/write</title> <programlisting> -void (*data_xfer) (struct ata_device *, unsigned char *, unsigned int, int); +void (*sff_data_xfer) (struct ata_device *, unsigned char *, unsigned int, int); </programlisting> <para> All bmdma-style drivers must implement this hook. This is the low-level operation that actually copies the data bytes during a PIO data transfer. -Typically the driver -will choose one of ata_pio_data_xfer_noirq(), ata_pio_data_xfer(), or -ata_mmio_data_xfer(). +Typically the driver will choose one of ata_sff_data_xfer_noirq(), +ata_sff_data_xfer(), or ata_sff_data_xfer32(). </para> </sect2> <sect2><title>ATA command execute</title> <programlisting> -void (*exec_command)(struct ata_port *ap, struct ata_taskfile *tf); +void (*sff_exec_command)(struct ata_port *ap, struct ata_taskfile *tf); </programlisting> <para> causes an ATA command, previously loaded with ->tf_load(), to be initiated in hardware. - Most drivers for taskfile-based hardware use ata_exec_command() + Most drivers for taskfile-based hardware use ata_sff_exec_command() for this hook. </para> @@ -218,8 +211,8 @@ command. <sect2><title>Read specific ATA shadow registers</title> <programlisting> -u8 (*check_status)(struct ata_port *ap); -u8 (*check_altstatus)(struct ata_port *ap); +u8 (*sff_check_status)(struct ata_port *ap); +u8 (*sff_check_altstatus)(struct ata_port *ap); </programlisting> <para> @@ -227,20 +220,26 @@ u8 (*check_altstatus)(struct ata_port *ap); hardware. On some hardware, reading the Status register has the side effect of clearing the interrupt condition. Most drivers for taskfile-based hardware use - ata_check_status() for this hook. + ata_sff_check_status() for this hook. </para> + + </sect2> + + <sect2><title>Write specific ATA shadow register</title> + <programlisting> +void (*sff_set_devctl)(struct ata_port *ap, u8 ctl); + </programlisting> + <para> - Note that because this is called from ata_device_add(), at - least a dummy function that clears device interrupts must be - provided for all drivers, even if the controller doesn't - actually have a taskfile status register. + Write the device control ATA shadow register to the hardware. + Most drivers don't need to define this. </para> </sect2> <sect2><title>Select ATA device on bus</title> <programlisting> -void (*dev_select)(struct ata_port *ap, unsigned int device); +void (*sff_dev_select)(struct ata_port *ap, unsigned int device); </programlisting> <para> @@ -251,9 +250,7 @@ void (*dev_select)(struct ata_port *ap, unsigned int device); </para> <para> Most drivers for taskfile-based hardware use - ata_std_dev_select() for this hook. Controllers which do not - support second drives on a port (such as SATA contollers) will - use ata_noop_dev_select(). + ata_sff_dev_select() for this hook. </para> </sect2> @@ -441,13 +438,13 @@ void (*irq_clear) (struct ata_port *); to struct ata_host_set. </para> <para> - Most legacy IDE drivers use ata_interrupt() for the + Most legacy IDE drivers use ata_sff_interrupt() for the irq_handler hook, which scans all ports in the host_set, determines which queued command was active (if any), and calls - ata_host_intr(ap,qc). + ata_sff_host_intr(ap,qc). </para> <para> - Most legacy IDE drivers use ata_bmdma_irq_clear() for the + Most legacy IDE drivers use ata_sff_irq_clear() for the irq_clear() hook, which simply clears the interrupt and error flags in the DMA status register. </para> @@ -490,16 +487,12 @@ void (*host_stop) (struct ata_host_set *host_set); allocates space for a legacy IDE PRD table and returns. </para> <para> - ->port_stop() is called after ->host_stop(). It's sole function + ->port_stop() is called after ->host_stop(). Its sole function is to release DMA/memory resources, now that they are no longer actively being used. Many drivers also free driver-private data from port at this time. </para> <para> - Many drivers use ata_port_stop() as this hook, which frees the - PRD table. - </para> - <para> ->host_stop() is called after all ->port_stop() calls have completed. The hook must finalize hardware shutdown, release DMA and other resources, etc. @@ -684,7 +677,7 @@ and other resources, etc. <listitem> <para> - ATA_QCFLAG_ACTIVE is clared from qc->flags. + ATA_QCFLAG_ACTIVE is cleared from qc->flags. </para> </listitem> @@ -715,7 +708,7 @@ and other resources, etc. <listitem> <para> - qc->waiting is claread & completed (in that order). + qc->waiting is cleared & completed (in that order). </para> </listitem> @@ -925,7 +918,7 @@ and other resources, etc. <title>HSM violation</title> <para> This error is indicated when STATUS value doesn't match HSM - requirement during issuing or excution any ATA/ATAPI command. + requirement during issuing or execution any ATA/ATAPI command. </para> <itemizedlist> @@ -952,7 +945,7 @@ and other resources, etc. <listitem> <para> - !BSY && ERR after CDB tranfer starts but before the + !BSY && ERR after CDB transfer starts but before the last byte of CDB is transferred. ATA/ATAPI standard states that "The device shall not terminate the PACKET command with an error before the last byte of the command packet has @@ -1039,7 +1032,7 @@ and other resources, etc. <listitem> <para> This is indicated by ICRC bit in the ERROR register and - means that corruption occurred during data transfer. Upto + means that corruption occurred during data transfer. Up to ATA/ATAPI-7, the standard specifies that this bit is only applicable to UDMA transfers but ATA/ATAPI-8 draft revision 1f says that the bit may be applicable to multiword DMA and @@ -1052,12 +1045,12 @@ and other resources, etc. <term>ABRT error during data transfer or on completion</term> <listitem> <para> - Upto ATA/ATAPI-7, the standard specifies that ABRT could be + Up to ATA/ATAPI-7, the standard specifies that ABRT could be set on ICRC errors and on cases where a device is not able to complete a command. Combined with the fact that MWDMA - and PIO transfer errors aren't allowed to use ICRC bit upto + and PIO transfer errors aren't allowed to use ICRC bit up to ATA/ATAPI-7, it seems to imply that ABRT bit alone could - indicate tranfer errors. + indicate transfer errors. </para> <para> However, ATA/ATAPI-8 draft revision 1f removes the part @@ -1129,7 +1122,7 @@ and other resources, etc. <para> Depending on commands, not all STATUS/ERROR bits are applicable. These non-applicable bits are marked with - "na" in the output descriptions but upto ATA/ATAPI-7 + "na" in the output descriptions but up to ATA/ATAPI-7 no definition of "na" can be found. However, ATA/ATAPI-8 draft revision 1f describes "N/A" as follows. @@ -1170,7 +1163,7 @@ and other resources, etc. <para> Once sense data is acquired, this type of errors can be - handled similary to other SCSI errors. Note that sense data + handled similarly to other SCSI errors. Note that sense data may indicate ATA bus error (e.g. Sense Key 04h HARDWARE ERROR && ASC/ASCQ 47h/00h SCSI PARITY ERROR). In such cases, the error should be considered as an ATA bus error and @@ -1514,7 +1507,7 @@ and other resources, etc. <listitem> <para> - CHS set up with INITIALIZE DEVICE PARAMETERS (seldomly used) + CHS set up with INITIALIZE DEVICE PARAMETERS (seldom used) </para> </listitem> diff --git a/Documentation/DocBook/mac80211.tmpl b/Documentation/DocBook/mac80211.tmpl deleted file mode 100644 index e3698666357..00000000000 --- a/Documentation/DocBook/mac80211.tmpl +++ /dev/null @@ -1,340 +0,0 @@ -<?xml version="1.0" encoding="UTF-8"?> -<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN" - "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" []> - -<book id="mac80211-developers-guide"> - <bookinfo> - <title>The mac80211 subsystem for kernel developers</title> - - <authorgroup> - <author> - <firstname>Johannes</firstname> - <surname>Berg</surname> - <affiliation> - <address><email>johannes@sipsolutions.net</email></address> - </affiliation> - </author> - </authorgroup> - - <copyright> - <year>2007-2009</year> - <holder>Johannes Berg</holder> - </copyright> - - <legalnotice> - <para> - This documentation is free software; you can redistribute - it and/or modify it under the terms of the GNU General Public - License version 2 as published by the Free Software Foundation. - </para> - - <para> - This documentation is distributed in the hope that it will be - useful, but WITHOUT ANY WARRANTY; without even the implied - warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. - See the GNU General Public License for more details. - </para> - - <para> - You should have received a copy of the GNU General Public - License along with this documentation; if not, write to the Free - Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, - MA 02111-1307 USA - </para> - - <para> - For more details see the file COPYING in the source - distribution of Linux. - </para> - </legalnotice> - - <abstract> -!Pinclude/net/mac80211.h Introduction -!Pinclude/net/mac80211.h Warning - </abstract> - </bookinfo> - - <toc></toc> - -<!-- -Generally, this document shall be ordered by increasing complexity. -It is important to note that readers should be able to read only -the first few sections to get a working driver and only advanced -usage should require reading the full document. ---> - - <part> - <title>The basic mac80211 driver interface</title> - <partintro> - <para> - You should read and understand the information contained - within this part of the book while implementing a driver. - In some chapters, advanced usage is noted, that may be - skipped at first. - </para> - <para> - This part of the book only covers station and monitor mode - functionality, additional information required to implement - the other modes is covered in the second part of the book. - </para> - </partintro> - - <chapter id="basics"> - <title>Basic hardware handling</title> - <para>TBD</para> - <para> - This chapter shall contain information on getting a hw - struct allocated and registered with mac80211. - </para> - <para> - Since it is required to allocate rates/modes before registering - a hw struct, this chapter shall also contain information on setting - up the rate/mode structs. - </para> - <para> - Additionally, some discussion about the callbacks and - the general programming model should be in here, including - the definition of ieee80211_ops which will be referred to - a lot. - </para> - <para> - Finally, a discussion of hardware capabilities should be done - with references to other parts of the book. - </para> -<!-- intentionally multiple !F lines to get proper order --> -!Finclude/net/mac80211.h ieee80211_hw -!Finclude/net/mac80211.h ieee80211_hw_flags -!Finclude/net/mac80211.h SET_IEEE80211_DEV -!Finclude/net/mac80211.h SET_IEEE80211_PERM_ADDR -!Finclude/net/mac80211.h ieee80211_ops -!Finclude/net/mac80211.h ieee80211_alloc_hw -!Finclude/net/mac80211.h ieee80211_register_hw -!Finclude/net/mac80211.h ieee80211_get_tx_led_name -!Finclude/net/mac80211.h ieee80211_get_rx_led_name -!Finclude/net/mac80211.h ieee80211_get_assoc_led_name -!Finclude/net/mac80211.h ieee80211_get_radio_led_name -!Finclude/net/mac80211.h ieee80211_unregister_hw -!Finclude/net/mac80211.h ieee80211_free_hw - </chapter> - - <chapter id="phy-handling"> - <title>PHY configuration</title> - <para>TBD</para> - <para> - This chapter should describe PHY handling including - start/stop callbacks and the various structures used. - </para> -!Finclude/net/mac80211.h ieee80211_conf -!Finclude/net/mac80211.h ieee80211_conf_flags - </chapter> - - <chapter id="iface-handling"> - <title>Virtual interfaces</title> - <para>TBD</para> - <para> - This chapter should describe virtual interface basics - that are relevant to the driver (VLANs, MGMT etc are not.) - It should explain the use of the add_iface/remove_iface - callbacks as well as the interface configuration callbacks. - </para> - <para>Things related to AP mode should be discussed there.</para> - <para> - Things related to supporting multiple interfaces should be - in the appropriate chapter, a BIG FAT note should be here about - this though and the recommendation to allow only a single - interface in STA mode at first! - </para> -!Finclude/net/mac80211.h ieee80211_if_init_conf - </chapter> - - <chapter id="rx-tx"> - <title>Receive and transmit processing</title> - <sect1> - <title>what should be here</title> - <para>TBD</para> - <para> - This should describe the receive and transmit - paths in mac80211/the drivers as well as - transmit status handling. - </para> - </sect1> - <sect1> - <title>Frame format</title> -!Pinclude/net/mac80211.h Frame format - </sect1> - <sect1> - <title>Packet alignment</title> -!Pnet/mac80211/rx.c Packet alignment - </sect1> - <sect1> - <title>Calling into mac80211 from interrupts</title> -!Pinclude/net/mac80211.h Calling mac80211 from interrupts - </sect1> - <sect1> - <title>functions/definitions</title> -!Finclude/net/mac80211.h ieee80211_rx_status -!Finclude/net/mac80211.h mac80211_rx_flags -!Finclude/net/mac80211.h ieee80211_tx_info -!Finclude/net/mac80211.h ieee80211_rx -!Finclude/net/mac80211.h ieee80211_rx_irqsafe -!Finclude/net/mac80211.h ieee80211_tx_status -!Finclude/net/mac80211.h ieee80211_tx_status_irqsafe -!Finclude/net/mac80211.h ieee80211_rts_get -!Finclude/net/mac80211.h ieee80211_rts_duration -!Finclude/net/mac80211.h ieee80211_ctstoself_get -!Finclude/net/mac80211.h ieee80211_ctstoself_duration -!Finclude/net/mac80211.h ieee80211_generic_frame_duration -!Finclude/net/mac80211.h ieee80211_get_hdrlen_from_skb -!Finclude/net/mac80211.h ieee80211_hdrlen -!Finclude/net/mac80211.h ieee80211_wake_queue -!Finclude/net/mac80211.h ieee80211_stop_queue -!Finclude/net/mac80211.h ieee80211_wake_queues -!Finclude/net/mac80211.h ieee80211_stop_queues - </sect1> - </chapter> - - <chapter id="filters"> - <title>Frame filtering</title> -!Pinclude/net/mac80211.h Frame filtering -!Finclude/net/mac80211.h ieee80211_filter_flags - </chapter> - </part> - - <part id="advanced"> - <title>Advanced driver interface</title> - <partintro> - <para> - Information contained within this part of the book is - of interest only for advanced interaction of mac80211 - with drivers to exploit more hardware capabilities and - improve performance. - </para> - </partintro> - - <chapter id="hardware-crypto-offload"> - <title>Hardware crypto acceleration</title> -!Pinclude/net/mac80211.h Hardware crypto acceleration -<!-- intentionally multiple !F lines to get proper order --> -!Finclude/net/mac80211.h set_key_cmd -!Finclude/net/mac80211.h ieee80211_key_conf -!Finclude/net/mac80211.h ieee80211_key_alg -!Finclude/net/mac80211.h ieee80211_key_flags - </chapter> - - <chapter id="powersave"> - <title>Powersave support</title> -!Pinclude/net/mac80211.h Powersave support - </chapter> - - <chapter id="beacon-filter"> - <title>Beacon filter support</title> -!Pinclude/net/mac80211.h Beacon filter support -!Finclude/net/mac80211.h ieee80211_beacon_loss - </chapter> - - <chapter id="qos"> - <title>Multiple queues and QoS support</title> - <para>TBD</para> -!Finclude/net/mac80211.h ieee80211_tx_queue_params -!Finclude/net/mac80211.h ieee80211_tx_queue_stats - </chapter> - - <chapter id="AP"> - <title>Access point mode support</title> - <para>TBD</para> - <para>Some parts of the if_conf should be discussed here instead</para> - <para> - Insert notes about VLAN interfaces with hw crypto here or - in the hw crypto chapter. - </para> -!Finclude/net/mac80211.h ieee80211_get_buffered_bc -!Finclude/net/mac80211.h ieee80211_beacon_get - </chapter> - - <chapter id="multi-iface"> - <title>Supporting multiple virtual interfaces</title> - <para>TBD</para> - <para> - Note: WDS with identical MAC address should almost always be OK - </para> - <para> - Insert notes about having multiple virtual interfaces with - different MAC addresses here, note which configurations are - supported by mac80211, add notes about supporting hw crypto - with it. - </para> - </chapter> - - <chapter id="hardware-scan-offload"> - <title>Hardware scan offload</title> - <para>TBD</para> -!Finclude/net/mac80211.h ieee80211_scan_completed - </chapter> - </part> - - <part id="rate-control"> - <title>Rate control interface</title> - <partintro> - <para>TBD</para> - <para> - This part of the book describes the rate control algorithm - interface and how it relates to mac80211 and drivers. - </para> - </partintro> - <chapter id="dummy"> - <title>dummy chapter</title> - <para>TBD</para> - </chapter> - </part> - - <part id="internal"> - <title>Internals</title> - <partintro> - <para>TBD</para> - <para> - This part of the book describes mac80211 internals. - </para> - </partintro> - - <chapter id="key-handling"> - <title>Key handling</title> - <sect1> - <title>Key handling basics</title> -!Pnet/mac80211/key.c Key handling basics - </sect1> - <sect1> - <title>MORE TBD</title> - <para>TBD</para> - </sect1> - </chapter> - - <chapter id="rx-processing"> - <title>Receive processing</title> - <para>TBD</para> - </chapter> - - <chapter id="tx-processing"> - <title>Transmit processing</title> - <para>TBD</para> - </chapter> - - <chapter id="sta-info"> - <title>Station info handling</title> - <sect1> - <title>Programming information</title> -!Fnet/mac80211/sta_info.h sta_info -!Fnet/mac80211/sta_info.h ieee80211_sta_info_flags - </sect1> - <sect1> - <title>STA information lifetime rules</title> -!Pnet/mac80211/sta_info.c STA information lifetime rules - </sect1> - </chapter> - - <chapter id="synchronisation"> - <title>Synchronisation</title> - <para>TBD</para> - <para>Locking, lots of RCU</para> - </chapter> - </part> -</book> diff --git a/Documentation/DocBook/mcabook.tmpl b/Documentation/DocBook/mcabook.tmpl deleted file mode 100644 index 467ccac6ec5..00000000000 --- a/Documentation/DocBook/mcabook.tmpl +++ /dev/null @@ -1,107 +0,0 @@ -<?xml version="1.0" encoding="UTF-8"?> -<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN" - "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" []> - -<book id="MCAGuide"> - <bookinfo> - <title>MCA Driver Programming Interface</title> - - <authorgroup> - <author> - <firstname>Alan</firstname> - <surname>Cox</surname> - <affiliation> - <address> - <email>alan@lxorguk.ukuu.org.uk</email> - </address> - </affiliation> - </author> - <author> - <firstname>David</firstname> - <surname>Weinehall</surname> - </author> - <author> - <firstname>Chris</firstname> - <surname>Beauregard</surname> - </author> - </authorgroup> - - <copyright> - <year>2000</year> - <holder>Alan Cox</holder> - <holder>David Weinehall</holder> - <holder>Chris Beauregard</holder> - </copyright> - - <legalnotice> - <para> - This documentation is free software; you can redistribute - it and/or modify it under the terms of the GNU General Public - License as published by the Free Software Foundation; either - version 2 of the License, or (at your option) any later - version. - </para> - - <para> - This program is distributed in the hope that it will be - useful, but WITHOUT ANY WARRANTY; without even the implied - warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. - See the GNU General Public License for more details. - </para> - - <para> - You should have received a copy of the GNU General Public - License along with this program; if not, write to the Free - Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, - MA 02111-1307 USA - </para> - - <para> - For more details see the file COPYING in the source - distribution of Linux. - </para> - </legalnotice> - </bookinfo> - -<toc></toc> - - <chapter id="intro"> - <title>Introduction</title> - <para> - The MCA bus functions provide a generalised interface to find MCA - bus cards, to claim them for a driver, and to read and manipulate POS - registers without being aware of the motherboard internals or - certain deep magic specific to onboard devices. - </para> - <para> - The basic interface to the MCA bus devices is the slot. Each slot - is numbered and virtual slot numbers are assigned to the internal - devices. Using a pci_dev as other busses do does not really make - sense in the MCA context as the MCA bus resources require card - specific interpretation. - </para> - <para> - Finally the MCA bus functions provide a parallel set of DMA - functions mimicing the ISA bus DMA functions as closely as possible, - although also supporting the additional DMA functionality on the - MCA bus controllers. - </para> - </chapter> - <chapter id="bugs"> - <title>Known Bugs And Assumptions</title> - <para> - None. - </para> - </chapter> - - <chapter id="pubfunctions"> - <title>Public Functions Provided</title> -!Edrivers/mca/mca-legacy.c - </chapter> - - <chapter id="dmafunctions"> - <title>DMA Functions Provided</title> -!Iarch/x86/include/asm/mca_dma.h - </chapter> - -</book> diff --git a/Documentation/DocBook/media/Makefile b/Documentation/DocBook/media/Makefile new file mode 100644 index 00000000000..639e7485796 --- /dev/null +++ b/Documentation/DocBook/media/Makefile @@ -0,0 +1,388 @@ +### +# Media build rules - Auto-generates media contents/indexes and *.h xml's +# + +SHELL=/bin/bash + +MEDIA_OBJ_DIR=$(objtree)/Documentation/DocBook/ +MEDIA_SRC_DIR=$(srctree)/Documentation/DocBook/media + +MEDIA_TEMP = media-entities.tmpl \ + media-indices.tmpl \ + videodev2.h.xml \ + v4l2.xml \ + audio.h.xml \ + ca.h.xml \ + dmx.h.xml \ + frontend.h.xml \ + net.h.xml \ + video.h.xml \ + +IMGFILES := $(patsubst %.b64,%, $(notdir $(shell ls $(MEDIA_SRC_DIR)/*.b64))) +OBJIMGFILES := $(addprefix $(MEDIA_OBJ_DIR)/, $(IMGFILES)) +GENFILES := $(addprefix $(MEDIA_OBJ_DIR)/, $(MEDIA_TEMP)) + +PHONY += cleanmediadocs + +cleanmediadocs: + -@rm `find $(MEDIA_OBJ_DIR) -type l` $(GENFILES) $(OBJIMGFILES) 2>/dev/null + +$(obj)/media_api.xml: $(GENFILES) FORCE + +#$(MEDIA_OBJ_DIR)/media_api.html: $(MEDIA_OBJ_DIR)/media_api.xml +#$(MEDIA_OBJ_DIR)/media_api.pdf: $(MEDIA_OBJ_DIR)/media_api.xml +#$(MEDIA_OBJ_DIR)/media_api.ps: $(MEDIA_OBJ_DIR)/media_api.xml + +V4L_SGMLS = \ + $(shell ls $(MEDIA_SRC_DIR)/v4l/*.xml|perl -ne 'print "$$1 " if (m,.*/(.*)\n,)') \ + capture.c.xml \ + keytable.c.xml \ + v4l2grab.c.xml + +DVB_SGMLS = \ + $(shell ls $(MEDIA_SRC_DIR)/dvb/*.xml|perl -ne 'print "$$1 " if (m,.*/(.*)\n,)') + +MEDIA_SGMLS = $(addprefix ./,$(V4L_SGMLS)) $(addprefix ./,$(DVB_SGMLS)) $(addprefix ./,$(MEDIA_TEMP)) + +FUNCS = \ + close \ + ioctl \ + mmap \ + munmap \ + open \ + poll \ + read \ + select \ + write \ + +IOCTLS = \ + $(shell perl -ne 'print "$$1 " if /\#define\s+([^\s]+)\s+_IO/' $(srctree)/include/uapi/linux/videodev2.h) \ + $(shell perl -ne 'print "$$1 " if /\#define\s+([^\s]+)\s+_IO/' $(srctree)/include/uapi/linux/dvb/audio.h) \ + $(shell perl -ne 'print "$$1 " if /\#define\s+([^\s]+)\s+_IO/' $(srctree)/include/uapi/linux/dvb/ca.h) \ + $(shell perl -ne 'print "$$1 " if /\#define\s+([^\s]+)\s+_IO/' $(srctree)/include/uapi/linux/dvb/dmx.h) \ + $(shell perl -ne 'print "$$1 " if /\#define\s+([^\s]+)\s+_IO/' $(srctree)/include/uapi/linux/dvb/frontend.h) \ + $(shell perl -ne 'print "$$1 " if /\#define\s+([A-Z][^\s]+)\s+_IO/' $(srctree)/include/uapi/linux/dvb/net.h) \ + $(shell perl -ne 'print "$$1 " if /\#define\s+([^\s]+)\s+_IO/' $(srctree)/include/uapi/linux/dvb/video.h) \ + $(shell perl -ne 'print "$$1 " if /\#define\s+([^\s]+)\s+_IO/' $(srctree)/include/uapi/linux/media.h) \ + $(shell perl -ne 'print "$$1 " if /\#define\s+([^\s]+)\s+_IO/' $(srctree)/include/uapi/linux/v4l2-subdev.h) \ + VIDIOC_SUBDEV_G_FRAME_INTERVAL \ + VIDIOC_SUBDEV_S_FRAME_INTERVAL \ + VIDIOC_SUBDEV_ENUM_MBUS_CODE \ + VIDIOC_SUBDEV_ENUM_FRAME_SIZE \ + VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL \ + VIDIOC_SUBDEV_G_SELECTION \ + VIDIOC_SUBDEV_S_SELECTION \ + +TYPES = \ + $(shell perl -ne 'print "$$1 " if /^typedef\s+[^\s]+\s+([^\s]+)\;/' $(srctree)/include/uapi/linux/videodev2.h) \ + $(shell perl -ne 'print "$$1 " if /^}\s+([a-z0-9_]+_t)/' $(srctree)/include/uapi/linux/dvb/frontend.h) + +ENUMS = \ + $(shell perl -ne 'print "$$1 " if /^enum\s+([^\s]+)\s+/' $(srctree)/include/uapi/linux/videodev2.h) \ + $(shell perl -ne 'print "$$1 " if /^enum\s+([^\s]+)\s+/' $(srctree)/include/uapi/linux/dvb/audio.h) \ + $(shell perl -ne 'print "$$1 " if /^enum\s+([^\s]+)\s+/' $(srctree)/include/uapi/linux/dvb/ca.h) \ + $(shell perl -ne 'print "$$1 " if /^enum\s+([^\s]+)\s+/' $(srctree)/include/uapi/linux/dvb/dmx.h) \ + $(shell perl -ne 'print "$$1 " if /^enum\s+([^\s]+)\s+/' $(srctree)/include/uapi/linux/dvb/frontend.h) \ + $(shell perl -ne 'print "$$1 " if /^enum\s+([^\s]+)\s+/' $(srctree)/include/uapi/linux/dvb/net.h) \ + $(shell perl -ne 'print "$$1 " if /^enum\s+([^\s]+)\s+/' $(srctree)/include/uapi/linux/dvb/video.h) \ + $(shell perl -ne 'print "$$1 " if /^enum\s+([^\s]+)\s+/' $(srctree)/include/uapi/linux/media.h) \ + $(shell perl -ne 'print "$$1 " if /^enum\s+([^\s]+)\s+/' $(srctree)/include/uapi/linux/v4l2-mediabus.h) \ + $(shell perl -ne 'print "$$1 " if /^enum\s+([^\s]+)\s+/' $(srctree)/include/uapi/linux/v4l2-subdev.h) + +STRUCTS = \ + $(shell perl -ne 'print "$$1 " if /^struct\s+([^\s]+)\s+/' $(srctree)/include/uapi/linux/videodev2.h) \ + $(shell perl -ne 'print "$$1 " if (/^struct\s+([^\s\{]+)\s*/)' $(srctree)/include/uapi/linux/dvb/audio.h) \ + $(shell perl -ne 'print "$$1 " if (/^struct\s+([^\s]+)\s+/)' $(srctree)/include/uapi/linux/dvb/ca.h) \ + $(shell perl -ne 'print "$$1 " if (/^struct\s+([^\s]+)\s+/)' $(srctree)/include/uapi/linux/dvb/dmx.h) \ + $(shell perl -ne 'print "$$1 " if (!/dtv\_cmds\_h/ && /^struct\s+([^\s]+)\s+/)' $(srctree)/include/uapi/linux/dvb/frontend.h) \ + $(shell perl -ne 'print "$$1 " if (/^struct\s+([A-Z][^\s]+)\s+/)' $(srctree)/include/uapi/linux/dvb/net.h) \ + $(shell perl -ne 'print "$$1 " if (/^struct\s+([^\s]+)\s+/)' $(srctree)/include/uapi/linux/dvb/video.h) \ + $(shell perl -ne 'print "$$1 " if /^struct\s+([^\s]+)\s+/' $(srctree)/include/uapi/linux/media.h) \ + $(shell perl -ne 'print "$$1 " if /^struct\s+([^\s]+)\s+/' $(srctree)/include/uapi/linux/v4l2-subdev.h) \ + $(shell perl -ne 'print "$$1 " if /^struct\s+([^\s]+)\s+/' $(srctree)/include/uapi/linux/v4l2-mediabus.h) + +ERRORS = \ + E2BIG \ + EACCES \ + EAGAIN \ + EBADF \ + EBADFD \ + EBADR \ + EBADRQC \ + EBUSY \ + ECHILD \ + ECONNRESET \ + EDEADLK \ + EDOM \ + EEXIST \ + EFAULT \ + EFBIG \ + EILSEQ \ + EINIT \ + EINPROGRESS \ + EINTR \ + EINVAL \ + EIO \ + EMFILE \ + ENFILE \ + ENOBUFS \ + ENODATA \ + ENODEV \ + ENOENT \ + ENOIOCTLCMD \ + ENOMEM \ + ENOSPC \ + ENOSR \ + ENOSYS \ + ENOTSUP \ + ENOTSUPP \ + ENOTTY \ + ENXIO \ + EOPNOTSUPP \ + EOVERFLOW \ + EPERM \ + EPIPE \ + EPROTO \ + ERANGE \ + EREMOTE \ + EREMOTEIO \ + ERESTART \ + ERESTARTSYS \ + ESHUTDOWN \ + ESPIPE \ + ETIME \ + ETIMEDOUT \ + EUSERS \ + EWOULDBLOCK \ + EXDEV \ + +ESCAPE = \ + -e "s/&/\\&/g" \ + -e "s/</\\</g" \ + -e "s/>/\\>/g" + +FILENAME = \ + -e s,"^[^\/]*/",, \ + -e s/"\\.xml"// \ + -e s/"\\.tmpl"// \ + -e s/\\\./-/g \ + -e s/"^func-"// \ + -e s/"^pixfmt-"// \ + -e s/"^vidioc-"// + +# Generate references to these structs in videodev2.h.xml. +DOCUMENTED = \ + -e "s/\(enum *\)v4l2_mpeg_cx2341x_video_\([a-z]*_spatial_filter_type\)/\1<link linkend=\"\2\">v4l2_mpeg_cx2341x_video_\2<\/link>/g" \ + -e "s/\(\(enum\|struct\) *\)\(v4l2_[a-zA-Z0-9_]*\)/\1<link linkend=\"\3\">\3<\/link>/g" \ + -e "s/\(V4L2_PIX_FMT_[A-Z0-9_]\+\) /<link linkend=\"\1\">\1<\/link> /g" \ + -e ":a;s/\(linkend=\".*\)_\(.*\">\)/\1-\2/;ta" \ + -e "s/v4l2\-mpeg\-vbi\-ITV0/v4l2-mpeg-vbi-itv0-1/g" + +DVB_DOCUMENTED = \ + -e "s/\(linkend\=\"\)FE_SET_PROPERTY/\1FE_GET_PROPERTY/g" \ + -e "s,\(struct\s\+\)\([a-z0-9_]\+\)\(\s\+{\),\1\<link linkend=\"\2\">\2\<\/link\>\3,g" \ + -e "s,\(}\s\+\)\([a-z0-9_]\+_t\+\),\1\<link linkend=\"\2\">\2\<\/link\>,g" \ + -e "s,\(define\s\+\)\(DTV_[A-Z0-9_]\+\)\(\s\+[0-9]\+\),\1\<link linkend=\"\2\">\2\<\/link\>\3,g" \ + -e "s,<link\s\+linkend=\".*\">\(DTV_IOCTL_MAX_MSGS\|dtv_cmds_h\|__.*_old\)<\/link>,\1,g" \ + -e ":a;s/\(linkend=\".*\)_\(.*\">\)/\1-\2/;ta" \ + -e "s,\(audio-mixer\|audio-karaoke\|audio-status\|ca-slot-info\|ca-descr-info\|ca-caps\|ca-msg\|ca-descr\|ca-pid\|dmx-filter\|dmx-caps\|video-system\|video-highlight\|video-spu\|video-spu-palette\|video-navi-pack\)-t,\1,g" \ + -e "s,DTV-ISDBT-LAYER[A-C],DTV-ISDBT-LAYER,g" \ + -e "s,\(define\s\+\)\([A-Z0-9_]\+\)\(\s\+_IO\),\1\<link linkend=\"\2\">\2\<\/link\>\3,g" \ + -e "s,<link\s\+linkend=\".*\">\(__.*_OLD\)<\/link>,\1,g" \ + +# +# Media targets and dependencies +# + +install_media_images = \ + $(Q)-cp $(OBJIMGFILES) $(MEDIA_SRC_DIR)/v4l/*.svg $(MEDIA_OBJ_DIR)/media_api + +$(MEDIA_OBJ_DIR)/%: $(MEDIA_SRC_DIR)/%.b64 + $(Q)base64 -d $< >$@ + +$(MEDIA_OBJ_DIR)/v4l2.xml: $(OBJIMGFILES) + @$($(quiet)gen_xml) + @(ln -sf `cd $(MEDIA_SRC_DIR) && /bin/pwd`/v4l/*xml $(MEDIA_OBJ_DIR)/) + @(ln -sf `cd $(MEDIA_SRC_DIR) && /bin/pwd`/dvb/*xml $(MEDIA_OBJ_DIR)/) + +$(MEDIA_OBJ_DIR)/videodev2.h.xml: $(srctree)/include/uapi/linux/videodev2.h $(MEDIA_OBJ_DIR)/v4l2.xml + @$($(quiet)gen_xml) + @( \ + echo "<programlisting>") > $@ + @( \ + expand --tabs=8 < $< | \ + sed $(ESCAPE) $(DOCUMENTED) | \ + sed 's/i\.e\./&ie;/') >> $@ + @( \ + echo "</programlisting>") >> $@ + +$(MEDIA_OBJ_DIR)/audio.h.xml: $(srctree)/include/uapi/linux/dvb/audio.h $(MEDIA_OBJ_DIR)/v4l2.xml + @$($(quiet)gen_xml) + @( \ + echo "<programlisting>") > $@ + @( \ + expand --tabs=8 < $< | \ + sed $(ESCAPE) $(DVB_DOCUMENTED) | \ + sed 's/i\.e\./&ie;/') >> $@ + @( \ + echo "</programlisting>") >> $@ + +$(MEDIA_OBJ_DIR)/ca.h.xml: $(srctree)/include/uapi/linux/dvb/ca.h $(MEDIA_OBJ_DIR)/v4l2.xml + @$($(quiet)gen_xml) + @( \ + echo "<programlisting>") > $@ + @( \ + expand --tabs=8 < $< | \ + sed $(ESCAPE) $(DVB_DOCUMENTED) | \ + sed 's/i\.e\./&ie;/') >> $@ + @( \ + echo "</programlisting>") >> $@ + +$(MEDIA_OBJ_DIR)/dmx.h.xml: $(srctree)/include/uapi/linux/dvb/dmx.h $(MEDIA_OBJ_DIR)/v4l2.xml + @$($(quiet)gen_xml) + @( \ + echo "<programlisting>") > $@ + @( \ + expand --tabs=8 < $< | \ + sed $(ESCAPE) $(DVB_DOCUMENTED) | \ + sed 's/i\.e\./&ie;/') >> $@ + @( \ + echo "</programlisting>") >> $@ + +$(MEDIA_OBJ_DIR)/frontend.h.xml: $(srctree)/include/uapi/linux/dvb/frontend.h $(MEDIA_OBJ_DIR)/v4l2.xml + @$($(quiet)gen_xml) + @( \ + echo "<programlisting>") > $@ + @( \ + expand --tabs=8 < $< | \ + sed $(ESCAPE) $(DVB_DOCUMENTED) | \ + sed 's/i\.e\./&ie;/') >> $@ + @( \ + echo "</programlisting>") >> $@ + +$(MEDIA_OBJ_DIR)/net.h.xml: $(srctree)/include/uapi/linux/dvb/net.h $(MEDIA_OBJ_DIR)/v4l2.xml + @$($(quiet)gen_xml) + @( \ + echo "<programlisting>") > $@ + @( \ + expand --tabs=8 < $< | \ + sed $(ESCAPE) $(DVB_DOCUMENTED) | \ + sed 's/i\.e\./&ie;/') >> $@ + @( \ + echo "</programlisting>") >> $@ + +$(MEDIA_OBJ_DIR)/video.h.xml: $(srctree)/include/uapi/linux/dvb/video.h $(MEDIA_OBJ_DIR)/v4l2.xml + @$($(quiet)gen_xml) + @( \ + echo "<programlisting>") > $@ + @( \ + expand --tabs=8 < $< | \ + sed $(ESCAPE) $(DVB_DOCUMENTED) | \ + sed 's/i\.e\./&ie;/') >> $@ + @( \ + echo "</programlisting>") >> $@ + +$(MEDIA_OBJ_DIR)/media-entities.tmpl: $(MEDIA_OBJ_DIR)/v4l2.xml + @$($(quiet)gen_xml) + @( \ + echo "<!-- Generated file! Do not edit. -->") >$@ + @( \ + echo -e "\n<!-- Functions -->") >>$@ + @( \ + for ident in $(FUNCS) ; do \ + entity=`echo $$ident | tr _ -` ; \ + echo "<!ENTITY func-$$entity \"<link" \ + "linkend='func-$$entity'><function>$$ident()</function></link>\">" \ + >>$@ ; \ + done) + @( \ + echo -e "\n<!-- Ioctls -->") >>$@ + @( \ + for ident in $(IOCTLS) ; do \ + entity=`echo $$ident | tr _ -` ; \ + id=`grep "<refname>$$ident" $(MEDIA_OBJ_DIR)/vidioc-*.xml $(MEDIA_OBJ_DIR)/media-ioc-*.xml | sed -r s,"^.*/(.*).xml.*","\1",` ; \ + echo "<!ENTITY $$entity \"<link" \ + "linkend='$$id'><constant>$$ident</constant></link>\">" \ + >>$@ ; \ + done) + @( \ + echo -e "\n<!-- Types -->") >>$@ + @( \ + for ident in $(TYPES) ; do \ + entity=`echo $$ident | tr _ -` ; \ + echo "<!ENTITY $$entity \"<link" \ + "linkend='$$entity'>$$ident</link>\">" >>$@ ; \ + done) + @( \ + echo -e "\n<!-- Enums -->") >>$@ + @( \ + for ident in $(ENUMS) ; do \ + entity=`echo $$ident | sed -e "s/v4l2_mpeg_cx2341x_video_\([a-z]*_spatial_filter_type\)/\1/" | tr _ -` ; \ + echo "<!ENTITY $$entity \"enum <link" \ + "linkend='$$entity'>$$ident</link>\">" >>$@ ; \ + done) + @( \ + echo -e "\n<!-- Structures -->") >>$@ + @( \ + for ident in $(STRUCTS) ; do \ + entity=`echo $$ident | tr _ - | sed s/v4l2-mpeg-vbi-ITV0/v4l2-mpeg-vbi-itv0-1/g` ; \ + echo "<!ENTITY $$entity \"struct <link" \ + "linkend='$$entity'>$$ident</link>\">" >>$@ ; \ + done) + @( \ + echo -e "\n<!-- Error Codes -->") >>$@ + @( \ + for ident in $(ERRORS) ; do \ + echo "<!ENTITY $$ident \"<errorcode>$$ident</errorcode>" \ + "error code\">" >>$@ ; \ + done) + @( \ + echo -e "\n<!-- Subsections -->") >>$@ + @( \ + for file in $(MEDIA_SGMLS) ; do \ + entity=`echo "$$file" | sed $(FILENAME) -e s/"^([^-]*)"/sub\1/` ; \ + if ! echo "$$file" | \ + grep -q -E -e '^(func|vidioc|pixfmt)-' ; then \ + echo "<!ENTITY sub-$$entity SYSTEM \"$$file\">" >>$@ ; \ + fi ; \ + done) + @( \ + echo -e "\n<!-- Function Reference -->") >>$@ + @( \ + for file in $(MEDIA_SGMLS) ; do \ + if echo "$$file" | \ + grep -q -E -e '(func|vidioc|pixfmt)-' ; then \ + entity=`echo "$$file" |sed $(FILENAME)` ; \ + echo "<!ENTITY $$entity SYSTEM \"$$file\">" >>$@ ; \ + fi ; \ + done) + +# Jade can auto-generate a list-of-tables, which includes all structs, +# but we only want data types, all types, and sorted please. +$(MEDIA_OBJ_DIR)/media-indices.tmpl: $(MEDIA_OBJ_DIR)/v4l2.xml + @$($(quiet)gen_xml) + @( \ + echo "<!-- Generated file! Do not edit. -->") >$@ + @( \ + echo -e "\n<index><title>List of Types</title>") >>$@ + @( \ + for ident in $(TYPES) ; do \ + id=`echo $$ident | tr _ -` ; \ + echo "<indexentry><primaryie><link" \ + "linkend='$$id'>$$ident</link></primaryie></indexentry>" >>$@ ; \ + done) + @( \ + for ident in $(ENUMS) ; do \ + id=`echo $$ident | sed -e "s/v4l2_mpeg_cx2341x_video_\([a-z]*_spatial_filter_type\)/\1/" | tr _ -`; \ + echo "<indexentry><primaryie>enum <link" \ + "linkend='$$id'>$$ident</link></primaryie></indexentry>" >>$@ ; \ + done) + @( \ + for ident in $(STRUCTS) ; do \ + id=`echo $$ident | tr _ - | sed s/v4l2-mpeg-vbi-ITV0/v4l2-mpeg-vbi-itv0-1/g` ; \ + echo "<indexentry><primaryie>struct <link" \ + "linkend='$$id'>$$ident</link></primaryie></indexentry>" >>$@ ; \ + done) + @( \ + echo "</index>") >>$@ + diff --git a/Documentation/DocBook/media/bayer.png.b64 b/Documentation/DocBook/media/bayer.png.b64 new file mode 100644 index 00000000000..ccdf2bcda95 --- /dev/null +++ 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It +can be accessed through <emphasis role="tt">/dev/dvb/adapter0/audio0</emphasis>. Data types and and +ioctl definitions can be accessed by including <emphasis role="tt">linux/dvb/audio.h</emphasis> in your +application. +</para> +<para>Please note that some DVB cards don’t have their own MPEG decoder, which results in +the omission of the audio and video device. +</para> +<para> +These ioctls were also used by V4L2 to control MPEG decoders implemented in V4L2. The use +of these ioctls for that purpose has been made obsolete and proper V4L2 ioctls or controls +have been created to replace that functionality.</para> + +<section id="audio_data_types"> +<title>Audio Data Types</title> +<para>This section describes the structures, data types and defines used when talking to the +audio device. +</para> + +<section id="audio-stream-source-t"> +<title>audio_stream_source_t</title> +<para>The audio stream source is set through the AUDIO_SELECT_SOURCE call and can take +the following values, depending on whether we are replaying from an internal (demux) or +external (user write) source. +</para> +<programlisting> +typedef enum { + AUDIO_SOURCE_DEMUX, + AUDIO_SOURCE_MEMORY +} audio_stream_source_t; +</programlisting> +<para>AUDIO_SOURCE_DEMUX selects the demultiplexer (fed either by the frontend or the +DVR device) as the source of the video stream. If AUDIO_SOURCE_MEMORY +is selected the stream comes from the application through the <emphasis role="tt">write()</emphasis> system +call. +</para> + +</section> +<section id="audio-play-state-t"> +<title>audio_play_state_t</title> +<para>The following values can be returned by the AUDIO_GET_STATUS call representing the +state of audio playback. +</para> +<programlisting> +typedef enum { + AUDIO_STOPPED, + AUDIO_PLAYING, + AUDIO_PAUSED +} audio_play_state_t; +</programlisting> + +</section> +<section id="audio-channel-select-t"> +<title>audio_channel_select_t</title> +<para>The audio channel selected via AUDIO_CHANNEL_SELECT is determined by the +following values. +</para> +<programlisting> +typedef enum { + AUDIO_STEREO, + AUDIO_MONO_LEFT, + AUDIO_MONO_RIGHT, + AUDIO_MONO, + AUDIO_STEREO_SWAPPED +} audio_channel_select_t; +</programlisting> + +</section> +<section id="audio-status"> +<title>struct audio_status</title> +<para>The AUDIO_GET_STATUS call returns the following structure informing about various +states of the playback operation. +</para> +<programlisting> +typedef struct audio_status { + boolean AV_sync_state; + boolean mute_state; + audio_play_state_t play_state; + audio_stream_source_t stream_source; + audio_channel_select_t channel_select; + boolean bypass_mode; + audio_mixer_t mixer_state; +} audio_status_t; +</programlisting> + +</section> +<section id="audio-mixer"> +<title>struct audio_mixer</title> +<para>The following structure is used by the AUDIO_SET_MIXER call to set the audio +volume. +</para> +<programlisting> +typedef struct audio_mixer { + unsigned int volume_left; + unsigned int volume_right; +} audio_mixer_t; +</programlisting> + +</section> +<section id="audio_encodings"> +<title>audio encodings</title> +<para>A call to AUDIO_GET_CAPABILITIES returns an unsigned integer with the following +bits set according to the hardwares capabilities. +</para> +<programlisting> + #define AUDIO_CAP_DTS 1 + #define AUDIO_CAP_LPCM 2 + #define AUDIO_CAP_MP1 4 + #define AUDIO_CAP_MP2 8 + #define AUDIO_CAP_MP3 16 + #define AUDIO_CAP_AAC 32 + #define AUDIO_CAP_OGG 64 + #define AUDIO_CAP_SDDS 128 + #define AUDIO_CAP_AC3 256 +</programlisting> + +</section> +<section id="audio-karaoke"> +<title>struct audio_karaoke</title> +<para>The ioctl AUDIO_SET_KARAOKE uses the following format: +</para> +<programlisting> +typedef +struct audio_karaoke { + int vocal1; + int vocal2; + int melody; +} audio_karaoke_t; +</programlisting> +<para>If Vocal1 or Vocal2 are non-zero, they get mixed into left and right t at 70% each. If both, +Vocal1 and Vocal2 are non-zero, Vocal1 gets mixed into the left channel and Vocal2 into the +right channel at 100% each. Ff Melody is non-zero, the melody channel gets mixed into left +and right. +</para> + +</section> +<section id="audio-attributes-t"> +<title>audio attributes</title> +<para>The following attributes can be set by a call to AUDIO_SET_ATTRIBUTES: +</para> +<programlisting> + typedef uint16_t audio_attributes_t; + /⋆ bits: descr. ⋆/ + /⋆ 15-13 audio coding mode (0=ac3, 2=mpeg1, 3=mpeg2ext, 4=LPCM, 6=DTS, ⋆/ + /⋆ 12 multichannel extension ⋆/ + /⋆ 11-10 audio type (0=not spec, 1=language included) ⋆/ + /⋆ 9- 8 audio application mode (0=not spec, 1=karaoke, 2=surround) ⋆/ + /⋆ 7- 6 Quantization / DRC (mpeg audio: 1=DRC exists)(lpcm: 0=16bit, ⋆/ + /⋆ 5- 4 Sample frequency fs (0=48kHz, 1=96kHz) ⋆/ + /⋆ 2- 0 number of audio channels (n+1 channels) ⋆/ +</programlisting> + </section></section> +<section id="audio_function_calls"> +<title>Audio Function Calls</title> + + +<section id="audio_fopen"> +<title>open()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This system call opens a named audio device (e.g. /dev/dvb/adapter0/audio0) + for subsequent use. When an open() call has succeeded, the device will be ready + for use. The significance of blocking or non-blocking mode is described in the + documentation for functions where there is a difference. It does not affect the + semantics of the open() call itself. A device opened in blocking mode can later + be put into non-blocking mode (and vice versa) using the F_SETFL command + of the fcntl system call. This is a standard system call, documented in the Linux + manual page for fcntl. Only one user can open the Audio Device in O_RDWR + mode. All other attempts to open the device in this mode will fail, and an error + code will be returned. If the Audio Device is opened in O_RDONLY mode, the + only ioctl call that can be used is AUDIO_GET_STATUS. All other call will + return with an error code.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int open(const char ⋆deviceName, int flags);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>const char + *deviceName</para> +</entry><entry + align="char"> +<para>Name of specific audio device.</para> +</entry> + </row><row><entry + align="char"> +<para>int flags</para> +</entry><entry + align="char"> +<para>A bit-wise OR of the following flags:</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>O_RDONLY read-only access</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>O_RDWR read/write access</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>O_NONBLOCK open in non-blocking mode</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>(blocking mode is the default)</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURN VALUE</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>ENODEV</para> +</entry><entry + align="char"> +<para>Device driver not loaded/available.</para> +</entry> + </row><row><entry + align="char"> +<para>EBUSY</para> +</entry><entry + align="char"> +<para>Device or resource busy.</para> +</entry> + </row><row><entry + align="char"> +<para>EINVAL</para> +</entry><entry + align="char"> +<para>Invalid argument.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section> +<section id="audio_fclose"> +<title>close()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This system call closes a previously opened audio device.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int close(int fd);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURN VALUE</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>EBADF</para> +</entry><entry + align="char"> +<para>fd is not a valid open file descriptor.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section> +<section id="audio_fwrite"> +<title>write()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This system call can only be used if AUDIO_SOURCE_MEMORY is selected + in the ioctl call AUDIO_SELECT_SOURCE. The data provided shall be in + PES format. If O_NONBLOCK is not specified the function will block until + buffer space is available. The amount of data to be transferred is implied by + count.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>size_t write(int fd, const void ⋆buf, size_t count);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>void *buf</para> +</entry><entry + align="char"> +<para>Pointer to the buffer containing the PES data.</para> +</entry> + </row><row><entry + align="char"> +<para>size_t count</para> +</entry><entry + align="char"> +<para>Size of buf.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURN VALUE</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>EPERM</para> +</entry><entry + align="char"> +<para>Mode AUDIO_SOURCE_MEMORY not selected.</para> +</entry> + </row><row><entry + align="char"> +<para>ENOMEM</para> +</entry><entry + align="char"> +<para>Attempted to write more data than the internal buffer can + hold.</para> +</entry> + </row><row><entry + align="char"> +<para>EBADF</para> +</entry><entry + align="char"> +<para>fd is not a valid open file descriptor.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section id="AUDIO_STOP" +role="subsection"><title>AUDIO_STOP</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call asks the Audio Device to stop playing the current stream.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = AUDIO_STOP);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_STOP for this command.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="AUDIO_PLAY" +role="subsection"><title>AUDIO_PLAY</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call asks the Audio Device to start playing an audio stream from the + selected source.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = AUDIO_PLAY);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_PLAY for this command.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="AUDIO_PAUSE" +role="subsection"><title>AUDIO_PAUSE</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call suspends the audio stream being played. Decoding and playing + are paused. It is then possible to restart again decoding and playing process of + the audio stream using AUDIO_CONTINUE command.</para> +</entry> + </row><row><entry + align="char"> +<para>If AUDIO_SOURCE_MEMORY is selected in the ioctl call + AUDIO_SELECT_SOURCE, the DVB-subsystem will not decode (consume) + any more data until the ioctl call AUDIO_CONTINUE or AUDIO_PLAY is + performed.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = AUDIO_PAUSE);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_PAUSE for this command.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="AUDIO_CONTINUE" +role="subsection"><title>AUDIO_CONTINUE</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl restarts the decoding and playing process previously paused +with AUDIO_PAUSE command.</para> +</entry> + </row><row><entry + align="char"> +<para>It only works if the stream were previously stopped with AUDIO_PAUSE</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = AUDIO_CONTINUE);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_CONTINUE for this command.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="AUDIO_SELECT_SOURCE" +role="subsection"><title>AUDIO_SELECT_SOURCE</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call informs the audio device which source shall be used + for the input data. The possible sources are demux or memory. If + AUDIO_SOURCE_MEMORY is selected, the data is fed to the Audio Device + through the write command.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = AUDIO_SELECT_SOURCE, + audio_stream_source_t source);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_SELECT_SOURCE for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>audio_stream_source_t + source</para> +</entry><entry + align="char"> +<para>Indicates the source that shall be used for the Audio + stream.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="AUDIO_SET_MUTE" +role="subsection"><title>AUDIO_SET_MUTE</title> +<para>DESCRIPTION +</para> +<para>This ioctl is for DVB devices only. To control a V4L2 decoder use the V4L2 +&VIDIOC-DECODER-CMD; with the <constant>V4L2_DEC_CMD_START_MUTE_AUDIO</constant> flag instead.</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call asks the audio device to mute the stream that is currently being + played.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = AUDIO_SET_MUTE, + boolean state);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_SET_MUTE for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>boolean state</para> +</entry><entry + align="char"> +<para>Indicates if audio device shall mute or not.</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>TRUE Audio Mute</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>FALSE Audio Un-mute</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="AUDIO_SET_AV_SYNC" +role="subsection"><title>AUDIO_SET_AV_SYNC</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call asks the Audio Device to turn ON or OFF A/V synchronization.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = AUDIO_SET_AV_SYNC, + boolean state);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_AV_SYNC for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>boolean state</para> +</entry><entry + align="char"> +<para>Tells the DVB subsystem if A/V synchronization shall be + ON or OFF.</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>TRUE AV-sync ON</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>FALSE AV-sync OFF</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="AUDIO_SET_BYPASS_MODE" +role="subsection"><title>AUDIO_SET_BYPASS_MODE</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call asks the Audio Device to bypass the Audio decoder and forward + the stream without decoding. This mode shall be used if streams that can’t be + handled by the DVB system shall be decoded. Dolby DigitalTM streams are + automatically forwarded by the DVB subsystem if the hardware can handle it.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = + AUDIO_SET_BYPASS_MODE, boolean mode);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_SET_BYPASS_MODE for this + command.</para> +</entry> + </row><row><entry + align="char"> +<para>boolean mode</para> +</entry><entry + align="char"> +<para>Enables or disables the decoding of the current Audio + stream in the DVB subsystem.</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>TRUE Bypass is disabled</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>FALSE Bypass is enabled</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="AUDIO_CHANNEL_SELECT" +role="subsection"><title>AUDIO_CHANNEL_SELECT</title> +<para>DESCRIPTION +</para> +<para>This ioctl is for DVB devices only. To control a V4L2 decoder use the V4L2 +<constant>V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK</constant> control instead.</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call asks the Audio Device to select the requested channel if possible.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = + AUDIO_CHANNEL_SELECT, audio_channel_select_t);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_CHANNEL_SELECT for this + command.</para> +</entry> + </row><row><entry + align="char"> +<para>audio_channel_select_t + ch</para> +</entry><entry + align="char"> +<para>Select the output format of the audio (mono left/right, + stereo).</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="AUDIO_BILINGUAL_CHANNEL_SELECT" +role="subsection"><title>AUDIO_BILINGUAL_CHANNEL_SELECT</title> +<para>DESCRIPTION +</para> +<para>This ioctl is obsolete. Do not use in new drivers. It has been replaced by +the V4L2 <constant>V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK</constant> control +for MPEG decoders controlled through V4L2.</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call asks the Audio Device to select the requested channel for bilingual streams if possible.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = + AUDIO_BILINGUAL_CHANNEL_SELECT, audio_channel_select_t);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_BILINGUAL_CHANNEL_SELECT for this + command.</para> +</entry> + </row><row><entry + align="char"> +<para>audio_channel_select_t +ch</para> +</entry><entry + align="char"> +<para>Select the output format of the audio (mono left/right, + stereo).</para> +</entry> + </row> +</tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="AUDIO_GET_PTS" +role="subsection"><title>AUDIO_GET_PTS</title> +<para>DESCRIPTION +</para> +<para>This ioctl is obsolete. Do not use in new drivers. If you need this functionality, +then please contact the linux-media mailing list (&v4l-ml;).</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call asks the Audio Device to return the current PTS timestamp.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = + AUDIO_GET_PTS, __u64 *pts);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_GET_PTS for this + command.</para> +</entry> + </row><row><entry + align="char"> +<para>__u64 *pts +</para> +</entry><entry + align="char"> +<para>Returns the 33-bit timestamp as defined in ITU T-REC-H.222.0 / ISO/IEC 13818-1. +</para> +<para> +The PTS should belong to the currently played +frame if possible, but may also be a value close to it +like the PTS of the last decoded frame or the last PTS +extracted by the PES parser.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="AUDIO_GET_STATUS" +role="subsection"><title>AUDIO_GET_STATUS</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call asks the Audio Device to return the current state of the Audio + Device.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = AUDIO_GET_STATUS, + struct audio_status ⋆status);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_GET_STATUS for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>struct audio_status + *status</para> +</entry><entry + align="char"> +<para>Returns the current state of Audio Device.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="AUDIO_GET_CAPABILITIES" +role="subsection"><title>AUDIO_GET_CAPABILITIES</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call asks the Audio Device to tell us about the decoding capabilities + of the audio hardware.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = + AUDIO_GET_CAPABILITIES, unsigned int ⋆cap);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_GET_CAPABILITIES for this + command.</para> +</entry> + </row><row><entry + align="char"> +<para>unsigned int *cap</para> +</entry><entry + align="char"> +<para>Returns a bit array of supported sound formats.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="AUDIO_CLEAR_BUFFER" +role="subsection"><title>AUDIO_CLEAR_BUFFER</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call asks the Audio Device to clear all software and hardware buffers + of the audio decoder device.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = AUDIO_CLEAR_BUFFER);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_CLEAR_BUFFER for this command.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="AUDIO_SET_ID" +role="subsection"><title>AUDIO_SET_ID</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl selects which sub-stream is to be decoded if a program or system + stream is sent to the video device. If no audio stream type is set the id has to be + in [0xC0,0xDF] for MPEG sound, in [0x80,0x87] for AC3 and in [0xA0,0xA7] + for LPCM. More specifications may follow for other stream types. If the stream + type is set the id just specifies the substream id of the audio stream and only + the first 5 bits are recognized.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = AUDIO_SET_ID, int + id);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_SET_ID for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>int id</para> +</entry><entry + align="char"> +<para>audio sub-stream id</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="AUDIO_SET_MIXER" +role="subsection"><title>AUDIO_SET_MIXER</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl lets you adjust the mixer settings of the audio decoder.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = AUDIO_SET_MIXER, + audio_mixer_t ⋆mix);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_SET_ID for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>audio_mixer_t *mix</para> +</entry><entry + align="char"> +<para>mixer settings.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="AUDIO_SET_STREAMTYPE" +role="subsection"><title>AUDIO_SET_STREAMTYPE</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl tells the driver which kind of audio stream to expect. This is useful + if the stream offers several audio sub-streams like LPCM and AC3.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(fd, int request = AUDIO_SET_STREAMTYPE, + int type);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_SET_STREAMTYPE for this + command.</para> +</entry> + </row><row><entry + align="char"> +<para>int type</para> +</entry><entry + align="char"> +<para>stream type</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>EINVAL</para> +</entry><entry + align="char"> +<para>type is not a valid or supported stream type.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section id="AUDIO_SET_EXT_ID" +role="subsection"><title>AUDIO_SET_EXT_ID</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl can be used to set the extension id for MPEG streams in DVD + playback. Only the first 3 bits are recognized.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(fd, int request = AUDIO_SET_EXT_ID, int + id);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_SET_EXT_ID for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>int id</para> +</entry><entry + align="char"> +<para>audio sub_stream_id</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>EINVAL</para> +</entry><entry + align="char"> +<para>id is not a valid id.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section id="AUDIO_SET_ATTRIBUTES" +role="subsection"><title>AUDIO_SET_ATTRIBUTES</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl is intended for DVD playback and allows you to set certain + information about the audio stream.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(fd, int request = AUDIO_SET_ATTRIBUTES, + audio_attributes_t attr );</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_SET_ATTRIBUTES for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>audio_attributes_t + attr</para> +</entry><entry + align="char"> +<para>audio attributes according to section ??</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>EINVAL</para> +</entry><entry + align="char"> +<para>attr is not a valid or supported attribute setting.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section id="AUDIO_SET_KARAOKE" +role="subsection"><title>AUDIO_SET_KARAOKE</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl allows one to set the mixer settings for a karaoke DVD.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(fd, int request = AUDIO_SET_KARAOKE, + audio_karaoke_t ⋆karaoke);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_SET_KARAOKE for this + command.</para> +</entry> + </row><row><entry + align="char"> +<para>audio_karaoke_t + *karaoke</para> +</entry><entry + align="char"> +<para>karaoke settings according to section ??.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>EINVAL</para> +</entry><entry + align="char"> +<para>karaoke is not a valid or supported karaoke setting.</para> +</entry> + </row></tbody></tgroup></informaltable> + </section> +</section> diff --git a/Documentation/DocBook/media/dvb/ca.xml b/Documentation/DocBook/media/dvb/ca.xml new file mode 100644 index 00000000000..85eaf4fe293 --- /dev/null +++ b/Documentation/DocBook/media/dvb/ca.xml @@ -0,0 +1,582 @@ +<title>DVB CA Device</title> +<para>The DVB CA device controls the conditional access hardware. It can be accessed through +<emphasis role="tt">/dev/dvb/adapter0/ca0</emphasis>. Data types and and ioctl definitions can be accessed by +including <emphasis role="tt">linux/dvb/ca.h</emphasis> in your application. +</para> + +<section id="ca_data_types"> +<title>CA Data Types</title> + + +<section id="ca-slot-info"> +<title>ca_slot_info_t</title> + <programlisting> +typedef struct ca_slot_info { + int num; /⋆ slot number ⋆/ + + int type; /⋆ CA interface this slot supports ⋆/ +#define CA_CI 1 /⋆ CI high level interface ⋆/ +#define CA_CI_LINK 2 /⋆ CI link layer level interface ⋆/ +#define CA_CI_PHYS 4 /⋆ CI physical layer level interface ⋆/ +#define CA_DESCR 8 /⋆ built-in descrambler ⋆/ +#define CA_SC 128 /⋆ simple smart card interface ⋆/ + + unsigned int flags; +#define CA_CI_MODULE_PRESENT 1 /⋆ module (or card) inserted ⋆/ +#define CA_CI_MODULE_READY 2 +} ca_slot_info_t; +</programlisting> + +</section> +<section id="ca-descr-info"> +<title>ca_descr_info_t</title> +<programlisting> +typedef struct ca_descr_info { + unsigned int num; /⋆ number of available descramblers (keys) ⋆/ + unsigned int type; /⋆ type of supported scrambling system ⋆/ +#define CA_ECD 1 +#define CA_NDS 2 +#define CA_DSS 4 +} ca_descr_info_t; +</programlisting> + +</section> +<section id="ca-caps"> +<title>ca_caps_t</title> +<programlisting> +typedef struct ca_caps { + unsigned int slot_num; /⋆ total number of CA card and module slots ⋆/ + unsigned int slot_type; /⋆ OR of all supported types ⋆/ + unsigned int descr_num; /⋆ total number of descrambler slots (keys) ⋆/ + unsigned int descr_type;/⋆ OR of all supported types ⋆/ + } ca_cap_t; +</programlisting> + +</section> +<section id="ca-msg"> +<title>ca_msg_t</title> +<programlisting> +/⋆ a message to/from a CI-CAM ⋆/ +typedef struct ca_msg { + unsigned int index; + unsigned int type; + unsigned int length; + unsigned char msg[256]; +} ca_msg_t; +</programlisting> + +</section> +<section id="ca-descr"> +<title>ca_descr_t</title> +<programlisting> +typedef struct ca_descr { + unsigned int index; + unsigned int parity; + unsigned char cw[8]; +} ca_descr_t; +</programlisting> +</section> + +<section id="ca-pid"> +<title>ca-pid</title> +<programlisting> +typedef struct ca_pid { + unsigned int pid; + int index; /⋆ -1 == disable⋆/ +} ca_pid_t; +</programlisting> +</section></section> + +<section id="ca_function_calls"> +<title>CA Function Calls</title> + + +<section id="ca_fopen"> +<title>open()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This system call opens a named ca device (e.g. /dev/ost/ca) for subsequent use.</para> +<para>When an open() call has succeeded, the device will be ready for use. + The significance of blocking or non-blocking mode is described in the + documentation for functions where there is a difference. It does not affect the + semantics of the open() call itself. A device opened in blocking mode can later + be put into non-blocking mode (and vice versa) using the F_SETFL command + of the fcntl system call. This is a standard system call, documented in the Linux + manual page for fcntl. Only one user can open the CA Device in O_RDWR + mode. All other attempts to open the device in this mode will fail, and an error + code will be returned.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int open(const char ⋆deviceName, int flags);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>const char + *deviceName</para> +</entry><entry + align="char"> +<para>Name of specific video device.</para> +</entry> + </row><row><entry + align="char"> +<para>int flags</para> +</entry><entry + align="char"> +<para>A bit-wise OR of the following flags:</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>O_RDONLY read-only access</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>O_RDWR read/write access</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>O_NONBLOCK open in non-blocking mode</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>(blocking mode is the default)</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURN VALUE</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>ENODEV</para> +</entry><entry + align="char"> +<para>Device driver not loaded/available.</para> +</entry> + </row><row><entry + align="char"> +<para>EINTERNAL</para> +</entry><entry + align="char"> +<para>Internal error.</para> +</entry> + </row><row><entry + align="char"> +<para>EBUSY</para> +</entry><entry + align="char"> +<para>Device or resource busy.</para> +</entry> + </row><row><entry + align="char"> +<para>EINVAL</para> +</entry><entry + align="char"> +<para>Invalid argument.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section> +<section id="ca_fclose"> +<title>close()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This system call closes a previously opened audio device.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int close(int fd);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURN VALUE</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>EBADF</para> +</entry><entry + align="char"> +<para>fd is not a valid open file descriptor.</para> +</entry> + </row></tbody></tgroup></informaltable> + </section> + +<section id="CA_RESET" +role="subsection"><title>CA_RESET</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl is undocumented. Documentation is welcome.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(fd, int request = CA_RESET); +</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals CA_RESET for this command.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +</section> + +<section id="CA_GET_CAP" +role="subsection"><title>CA_GET_CAP</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl is undocumented. Documentation is welcome.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(fd, int request = CA_GET_CAP, + ca_caps_t *);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals CA_GET_CAP for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>ca_caps_t * +</para> +</entry><entry + align="char"> +<para>Undocumented.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +</section> + +<section id="CA_GET_SLOT_INFO" +role="subsection"><title>CA_GET_SLOT_INFO</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl is undocumented. Documentation is welcome.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(fd, int request = CA_GET_SLOT_INFO, + ca_slot_info_t *);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals CA_GET_SLOT_INFO for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>ca_slot_info_t * +</para> +</entry><entry + align="char"> +<para>Undocumented.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +</section> + +<section id="CA_GET_DESCR_INFO" +role="subsection"><title>CA_GET_DESCR_INFO</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl is undocumented. Documentation is welcome.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(fd, int request = CA_GET_DESCR_INFO, + ca_descr_info_t *);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals CA_GET_DESCR_INFO for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>ca_descr_info_t * +</para> +</entry><entry + align="char"> +<para>Undocumented.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +</section> + +<section id="CA_GET_MSG" +role="subsection"><title>CA_GET_MSG</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl is undocumented. Documentation is welcome.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(fd, int request = CA_GET_MSG, + ca_msg_t *);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals CA_GET_MSG for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>ca_msg_t * +</para> +</entry><entry + align="char"> +<para>Undocumented.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +</section> + +<section id="CA_SEND_MSG" +role="subsection"><title>CA_SEND_MSG</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl is undocumented. Documentation is welcome.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(fd, int request = CA_SEND_MSG, + ca_msg_t *);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals CA_SEND_MSG for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>ca_msg_t * +</para> +</entry><entry + align="char"> +<para>Undocumented.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +</section> + +<section id="CA_SET_DESCR" +role="subsection"><title>CA_SET_DESCR</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl is undocumented. Documentation is welcome.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(fd, int request = CA_SET_DESCR, + ca_descr_t *);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals CA_SET_DESCR for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>ca_descr_t * +</para> +</entry><entry + align="char"> +<para>Undocumented.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +</section> + +<section id="CA_SET_PID" +role="subsection"><title>CA_SET_PID</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl is undocumented. Documentation is welcome.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(fd, int request = CA_SET_PID, + ca_pid_t *);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals CA_SET_PID for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>ca_pid_t * +</para> +</entry><entry + align="char"> +<para>Undocumented.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +</section> + +</section> diff --git a/Documentation/DocBook/media/dvb/demux.xml b/Documentation/DocBook/media/dvb/demux.xml new file mode 100644 index 00000000000..c8683d66f05 --- /dev/null +++ b/Documentation/DocBook/media/dvb/demux.xml @@ -0,0 +1,1145 @@ +<title>DVB Demux Device</title> + +<para>The DVB demux device controls the filters of the DVB hardware/software. It can be +accessed through <emphasis role="tt">/dev/adapter0/demux0</emphasis>. Data types and and ioctl definitions can be +accessed by including <emphasis role="tt">linux/dvb/dmx.h</emphasis> in your application. +</para> +<section id="dmx_types"> +<title>Demux Data Types</title> + +<section id="dmx-output-t"> +<title>dmx_output_t</title> +<programlisting> +typedef enum +{ + DMX_OUT_DECODER, /⋆ Streaming directly to decoder. ⋆/ + DMX_OUT_TAP, /⋆ Output going to a memory buffer ⋆/ + /⋆ (to be retrieved via the read command).⋆/ + DMX_OUT_TS_TAP, /⋆ Output multiplexed into a new TS ⋆/ + /⋆ (to be retrieved by reading from the ⋆/ + /⋆ logical DVR device). ⋆/ + DMX_OUT_TSDEMUX_TAP /⋆ Like TS_TAP but retrieved from the DMX device ⋆/ +} dmx_output_t; +</programlisting> +<para><emphasis role="tt">DMX_OUT_TAP</emphasis> delivers the stream output to the demux device on which the ioctl is +called. +</para> +<para><emphasis role="tt">DMX_OUT_TS_TAP</emphasis> routes output to the logical DVR device <emphasis role="tt">/dev/dvb/adapter0/dvr0</emphasis>, +which delivers a TS multiplexed from all filters for which <emphasis role="tt">DMX_OUT_TS_TAP</emphasis> was +specified. +</para> +</section> + +<section id="dmx-input-t"> +<title>dmx_input_t</title> +<programlisting> +typedef enum +{ + DMX_IN_FRONTEND, /⋆ Input from a front-end device. ⋆/ + DMX_IN_DVR /⋆ Input from the logical DVR device. ⋆/ +} dmx_input_t; +</programlisting> +</section> + +<section id="dmx-pes-type-t"> +<title>dmx_pes_type_t</title> +<programlisting> +typedef enum +{ + DMX_PES_AUDIO0, + DMX_PES_VIDEO0, + DMX_PES_TELETEXT0, + DMX_PES_SUBTITLE0, + DMX_PES_PCR0, + + DMX_PES_AUDIO1, + DMX_PES_VIDEO1, + DMX_PES_TELETEXT1, + DMX_PES_SUBTITLE1, + DMX_PES_PCR1, + + DMX_PES_AUDIO2, + DMX_PES_VIDEO2, + DMX_PES_TELETEXT2, + DMX_PES_SUBTITLE2, + DMX_PES_PCR2, + + DMX_PES_AUDIO3, + DMX_PES_VIDEO3, + DMX_PES_TELETEXT3, + DMX_PES_SUBTITLE3, + DMX_PES_PCR3, + + DMX_PES_OTHER +} dmx_pes_type_t; +</programlisting> +</section> + +<section id="dmx-filter"> +<title>struct dmx_filter</title> + <programlisting> + typedef struct dmx_filter +{ + __u8 filter[DMX_FILTER_SIZE]; + __u8 mask[DMX_FILTER_SIZE]; + __u8 mode[DMX_FILTER_SIZE]; +} dmx_filter_t; +</programlisting> +</section> + +<section id="dmx-sct-filter-params"> +<title>struct dmx_sct_filter_params</title> +<programlisting> +struct dmx_sct_filter_params +{ + __u16 pid; + dmx_filter_t filter; + __u32 timeout; + __u32 flags; +#define DMX_CHECK_CRC 1 +#define DMX_ONESHOT 2 +#define DMX_IMMEDIATE_START 4 +#define DMX_KERNEL_CLIENT 0x8000 +}; +</programlisting> +</section> + +<section id="dmx-pes-filter-params"> +<title>struct dmx_pes_filter_params</title> +<programlisting> +struct dmx_pes_filter_params +{ + __u16 pid; + dmx_input_t input; + dmx_output_t output; + dmx_pes_type_t pes_type; + __u32 flags; +}; +</programlisting> +</section> + +<section id="dmx-event"> +<title>struct dmx_event</title> + <programlisting> + struct dmx_event + { + dmx_event_t event; + time_t timeStamp; + union + { + dmx_scrambling_status_t scrambling; + } u; + }; +</programlisting> +</section> + +<section id="dmx-stc"> +<title>struct dmx_stc</title> +<programlisting> +struct dmx_stc { + unsigned int num; /⋆ input : which STC? 0..N ⋆/ + unsigned int base; /⋆ output: divisor for stc to get 90 kHz clock ⋆/ + __u64 stc; /⋆ output: stc in 'base'⋆90 kHz units ⋆/ +}; +</programlisting> +</section> + +<section id="dmx-caps"> +<title>struct dmx_caps</title> +<programlisting> + typedef struct dmx_caps { + __u32 caps; + int num_decoders; +} dmx_caps_t; +</programlisting> +</section> + +<section id="dmx-source-t"> +<title>enum dmx_source_t</title> +<programlisting> +typedef enum { + DMX_SOURCE_FRONT0 = 0, + DMX_SOURCE_FRONT1, + DMX_SOURCE_FRONT2, + DMX_SOURCE_FRONT3, + DMX_SOURCE_DVR0 = 16, + DMX_SOURCE_DVR1, + DMX_SOURCE_DVR2, + DMX_SOURCE_DVR3 +} dmx_source_t; +</programlisting> +</section> + +</section> +<section id="dmx_fcalls"> +<title>Demux Function Calls</title> + +<section id="dmx_fopen"> +<title>open()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This system call, used with a device name of /dev/dvb/adapter0/demux0, + allocates a new filter and returns a handle which can be used for subsequent + control of that filter. This call has to be made for each filter to be used, i.e. every + returned file descriptor is a reference to a single filter. /dev/dvb/adapter0/dvr0 + is a logical device to be used for retrieving Transport Streams for digital + video recording. When reading from this device a transport stream containing + the packets from all PES filters set in the corresponding demux device + (/dev/dvb/adapter0/demux0) having the output set to DMX_OUT_TS_TAP. A + recorded Transport Stream is replayed by writing to this device. </para> +<para>The significance of blocking or non-blocking mode is described in the + documentation for functions where there is a difference. It does not affect the + semantics of the open() call itself. A device opened in blocking mode can later + be put into non-blocking mode (and vice versa) using the F_SETFL command + of the fcntl system call.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int open(const char ⋆deviceName, int flags);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>const char + *deviceName</para> +</entry><entry + align="char"> +<para>Name of demux device.</para> +</entry> + </row><row><entry + align="char"> +<para>int flags</para> +</entry><entry + align="char"> +<para>A bit-wise OR of the following flags:</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>O_RDWR read/write access</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>O_NONBLOCK open in non-blocking mode</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>(blocking mode is the default)</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURN VALUE</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>ENODEV</para> +</entry><entry + align="char"> +<para>Device driver not loaded/available.</para> +</entry> + </row><row><entry + align="char"> +<para>EINVAL</para> +</entry><entry + align="char"> +<para>Invalid argument.</para> +</entry> + </row><row><entry + align="char"> +<para>EMFILE</para> +</entry><entry + align="char"> +<para>“Too many open files”, i.e. no more filters available.</para> +</entry> + </row><row><entry + align="char"> +<para>ENOMEM</para> +</entry><entry + align="char"> +<para>The driver failed to allocate enough memory.</para> +</entry> + </row></tbody></tgroup></informaltable> +</section> + +<section id="dmx_fclose"> +<title>close()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This system call deactivates and deallocates a filter that was previously + allocated via the open() call.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int close(int fd);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURN VALUE</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>EBADF</para> +</entry><entry + align="char"> +<para>fd is not a valid open file descriptor.</para> +</entry> + </row></tbody></tgroup></informaltable> +</section> + +<section id="dmx_fread"> +<title>read()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This system call returns filtered data, which might be section or PES data. The + filtered data is transferred from the driver’s internal circular buffer to buf. The + maximum amount of data to be transferred is implied by count.</para> +</entry> + </row><row><entry + align="char"> +<para>When returning section data the driver always tries to return a complete single + section (even though buf would provide buffer space for more data). If the size + of the buffer is smaller than the section as much as possible will be returned, + and the remaining data will be provided in subsequent calls.</para> +</entry> + </row><row><entry + align="char"> +<para>The size of the internal buffer is 2 * 4096 bytes (the size of two maximum + sized sections) by default. The size of this buffer may be changed by using the + DMX_SET_BUFFER_SIZE function. If the buffer is not large enough, or if + the read operations are not performed fast enough, this may result in a buffer + overflow error. In this case EOVERFLOW will be returned, and the circular + buffer will be emptied. This call is blocking if there is no data to return, i.e. the + process will be put to sleep waiting for data, unless the O_NONBLOCK flag + is specified.</para> +</entry> + </row><row><entry + align="char"> +<para>Note that in order to be able to read, the filtering process has to be started + by defining either a section or a PES filter by means of the ioctl functions, + and then starting the filtering process via the DMX_START ioctl function + or by setting the DMX_IMMEDIATE_START flag. If the reading is done + from a logical DVR demux device, the data will constitute a Transport Stream + including the packets from all PES filters in the corresponding demux device + /dev/dvb/adapter0/demux0 having the output set to DMX_OUT_TS_TAP.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>size_t read(int fd, void ⋆buf, size_t count);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>void *buf</para> +</entry><entry + align="char"> +<para>Pointer to the buffer to be used for returned filtered data.</para> +</entry> + </row><row><entry + align="char"> +<para>size_t count</para> +</entry><entry + align="char"> +<para>Size of buf.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURN VALUE</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>EWOULDBLOCK</para> +</entry><entry + align="char"> +<para>No data to return and O_NONBLOCK was specified.</para> +</entry> + </row><row><entry + align="char"> +<para>EBADF</para> +</entry><entry + align="char"> +<para>fd is not a valid open file descriptor.</para> +</entry> + </row><row><entry + align="char"> +<para>ECRC</para> +</entry><entry + align="char"> +<para>Last section had a CRC error - no data returned. The + buffer is flushed.</para> +</entry> + </row><row><entry + align="char"> +<para>EOVERFLOW</para> +</entry><entry + align="char"> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>The filtered data was not read from the buffer in due + time, resulting in non-read data being lost. The buffer is + flushed.</para> +</entry> + </row><row><entry + align="char"> +<para>ETIMEDOUT</para> +</entry><entry + align="char"> +<para>The section was not loaded within the stated timeout + period. See ioctl DMX_SET_FILTER for how to set a + timeout.</para> +</entry> + </row><row><entry + align="char"> +<para>EFAULT</para> +</entry><entry + align="char"> +<para>The driver failed to write to the callers buffer due to an + invalid *buf pointer.</para> +</entry> + </row></tbody></tgroup></informaltable> +</section> + +<section id="dmx_fwrite"> +<title>write()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This system call is only provided by the logical device /dev/dvb/adapter0/dvr0, + associated with the physical demux device that provides the actual DVR + functionality. It is used for replay of a digitally recorded Transport Stream. + Matching filters have to be defined in the corresponding physical demux + device, /dev/dvb/adapter0/demux0. The amount of data to be transferred is + implied by count.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>ssize_t write(int fd, const void ⋆buf, size_t + count);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>void *buf</para> +</entry><entry + align="char"> +<para>Pointer to the buffer containing the Transport Stream.</para> +</entry> + </row><row><entry + align="char"> +<para>size_t count</para> +</entry><entry + align="char"> +<para>Size of buf.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURN VALUE</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>EWOULDBLOCK</para> +</entry><entry + align="char"> +<para>No data was written. This + might happen if O_NONBLOCK was specified and there + is no more buffer space available (if O_NONBLOCK is + not specified the function will block until buffer space is + available).</para> +</entry> + </row><row><entry + align="char"> +<para>EBUSY</para> +</entry><entry + align="char"> +<para>This error code indicates that there are conflicting + requests. The corresponding demux device is setup to + receive data from the front- end. Make sure that these + filters are stopped and that the filters with input set to + DMX_IN_DVR are started.</para> +</entry> + </row><row><entry + align="char"> +<para>EBADF</para> +</entry><entry + align="char"> +<para>fd is not a valid open file descriptor.</para> +</entry> + </row></tbody></tgroup></informaltable> +</section> + +<section id="DMX_START"> +<title>DMX_START</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call is used to start the actual filtering operation defined via the ioctl + calls DMX_SET_FILTER or DMX_SET_PES_FILTER.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl( int fd, int request = DMX_START);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals DMX_START for this command.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>EINVAL</para> +</entry><entry + align="char"> +<para>Invalid argument, i.e. no filtering parameters provided via + the DMX_SET_FILTER or DMX_SET_PES_FILTER + functions.</para> +</entry> + </row><row><entry + align="char"> +<para>EBUSY</para> +</entry><entry + align="char"> +<para>This error code indicates that there are conflicting + requests. There are active filters filtering data from + another input source. Make sure that these filters are + stopped before starting this filter.</para> +</entry> + </row></tbody></tgroup></informaltable> +</section> + +<section id="DMX_STOP"> +<title>DMX_STOP</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call is used to stop the actual filtering operation defined via the + ioctl calls DMX_SET_FILTER or DMX_SET_PES_FILTER and started via + the DMX_START command.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl( int fd, int request = DMX_STOP);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals DMX_STOP for this command.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +</section> + +<section id="DMX_SET_FILTER"> +<title>DMX_SET_FILTER</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call sets up a filter according to the filter and mask parameters + provided. A timeout may be defined stating number of seconds to wait for a + section to be loaded. A value of 0 means that no timeout should be applied. + Finally there is a flag field where it is possible to state whether a section should + be CRC-checked, whether the filter should be a ”one-shot” filter, i.e. if the + filtering operation should be stopped after the first section is received, and + whether the filtering operation should be started immediately (without waiting + for a DMX_START ioctl call). If a filter was previously set-up, this filter will + be canceled, and the receive buffer will be flushed.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl( int fd, int request = DMX_SET_FILTER, + struct dmx_sct_filter_params ⋆params);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals DMX_SET_FILTER for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>struct + dmx_sct_filter_params + *params</para> +</entry><entry + align="char"> +<para>Pointer to structure containing filter parameters.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +</section> + +<section id="DMX_SET_PES_FILTER"> +<title>DMX_SET_PES_FILTER</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call sets up a PES filter according to the parameters provided. By a + PES filter is meant a filter that is based just on the packet identifier (PID), i.e. + no PES header or payload filtering capability is supported.</para> +</entry> + </row><row><entry + align="char"> +<para>The transport stream destination for the filtered output may be set. Also the + PES type may be stated in order to be able to e.g. direct a video stream directly + to the video decoder. Finally there is a flag field where it is possible to state + whether the filtering operation should be started immediately (without waiting + for a DMX_START ioctl call). If a filter was previously set-up, this filter will + be cancelled, and the receive buffer will be flushed.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl( int fd, int request = DMX_SET_PES_FILTER, + struct dmx_pes_filter_params ⋆params);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals DMX_SET_PES_FILTER for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>struct + dmx_pes_filter_params + *params</para> +</entry><entry + align="char"> +<para>Pointer to structure containing filter parameters.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>EBUSY</para> +</entry><entry + align="char"> +<para>This error code indicates that there are conflicting + requests. There are active filters filtering data from + another input source. Make sure that these filters are + stopped before starting this filter.</para> +</entry> + </row></tbody></tgroup></informaltable> +</section> + +<section id="DMX_SET_BUFFER_SIZE"> +<title>DMX_SET_BUFFER_SIZE</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call is used to set the size of the circular buffer used for filtered data. + The default size is two maximum sized sections, i.e. if this function is not called + a buffer size of 2 * 4096 bytes will be used.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl( int fd, int request = + DMX_SET_BUFFER_SIZE, unsigned long size);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals DMX_SET_BUFFER_SIZE for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>unsigned long size</para> +</entry><entry + align="char"> +<para>Size of circular buffer.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +</section> + +<section id="DMX_GET_EVENT"> +<title>DMX_GET_EVENT</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call returns an event if available. If an event is not available, + the behavior depends on whether the device is in blocking or non-blocking + mode. In the latter case, the call fails immediately with errno set to + EWOULDBLOCK. In the former case, the call blocks until an event becomes + available.</para> +</entry> + </row><row><entry + align="char"> +<para>The standard Linux poll() and/or select() system calls can be used with the + device file descriptor to watch for new events. For select(), the file descriptor + should be included in the exceptfds argument, and for poll(), POLLPRI should + be specified as the wake-up condition. Only the latest event for each filter is + saved.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl( int fd, int request = DMX_GET_EVENT, + struct dmx_event ⋆ev);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals DMX_GET_EVENT for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>struct dmx_event *ev</para> +</entry><entry + align="char"> +<para>Pointer to the location where the event is to be stored.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>EWOULDBLOCK</para> +</entry><entry + align="char"> +<para>There is no event pending, and the device is in + non-blocking mode.</para> +</entry> + </row></tbody></tgroup></informaltable> +</section> + +<section id="DMX_GET_STC"> +<title>DMX_GET_STC</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call returns the current value of the system time counter (which is driven + by a PES filter of type DMX_PES_PCR). Some hardware supports more than one + STC, so you must specify which one by setting the num field of stc before the ioctl + (range 0...n). The result is returned in form of a ratio with a 64 bit numerator + and a 32 bit denominator, so the real 90kHz STC value is stc->stc / + stc->base + .</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl( int fd, int request = DMX_GET_STC, struct + dmx_stc ⋆stc);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals DMX_GET_STC for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>struct dmx_stc *stc</para> +</entry><entry + align="char"> +<para>Pointer to the location where the stc is to be stored.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>EINVAL</para> +</entry><entry + align="char"> +<para>Invalid stc number.</para> +</entry> + </row></tbody></tgroup></informaltable> + </section> + +<section id="DMX_GET_PES_PIDS" +role="subsection"><title>DMX_GET_PES_PIDS</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl is undocumented. Documentation is welcome.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(fd, int request = DMX_GET_PES_PIDS, + __u16[5]);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals DMX_GET_PES_PIDS for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>__u16[5] +</para> +</entry><entry + align="char"> +<para>Undocumented.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +</section> + +<section id="DMX_GET_CAPS" +role="subsection"><title>DMX_GET_CAPS</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl is undocumented. Documentation is welcome.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(fd, int request = DMX_GET_CAPS, + dmx_caps_t *);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals DMX_GET_CAPS for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>dmx_caps_t * +</para> +</entry><entry + align="char"> +<para>Undocumented.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +</section> + +<section id="DMX_SET_SOURCE" +role="subsection"><title>DMX_SET_SOURCE</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl is undocumented. Documentation is welcome.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(fd, int request = DMX_SET_SOURCE, + dmx_source_t *);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals DMX_SET_SOURCE for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>dmx_source_t * +</para> +</entry><entry + align="char"> +<para>Undocumented.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +</section> + +<section id="DMX_ADD_PID" +role="subsection"><title>DMX_ADD_PID</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call allows to add multiple PIDs to a transport stream filter +previously set up with DMX_SET_PES_FILTER and output equal to DMX_OUT_TSDEMUX_TAP. +</para></entry></row><row><entry align="char"><para> +It is used by readers of /dev/dvb/adapterX/demuxY. +</para></entry></row><row><entry align="char"><para> +It may be called at any time, i.e. before or after the first filter on the +shared file descriptor was started. It makes it possible to record multiple +services without the need to de-multiplex or re-multiplex TS packets.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(fd, int request = DMX_ADD_PID, + __u16 *);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals DMX_ADD_PID for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>__u16 * +</para> +</entry><entry + align="char"> +<para>PID number to be filtered.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +</section> + +<section id="DMX_REMOVE_PID" +role="subsection"><title>DMX_REMOVE_PID</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call allows to remove a PID when multiple PIDs are set on a +transport stream filter, e. g. a filter previously set up with output equal to +DMX_OUT_TSDEMUX_TAP, created via either DMX_SET_PES_FILTER or DMX_ADD_PID. +</para></entry></row><row><entry align="char"><para> +It is used by readers of /dev/dvb/adapterX/demuxY. +</para></entry></row><row><entry align="char"><para> +It may be called at any time, i.e. before or after the first filter on the +shared file descriptor was started. It makes it possible to record multiple +services without the need to de-multiplex or re-multiplex TS packets.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(fd, int request = DMX_REMOVE_PID, + __u16 *);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals DMX_REMOVE_PID for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>__u16 * +</para> +</entry><entry + align="char"> +<para>PID of the PES filter to be removed.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +</section> + + +</section> diff --git a/Documentation/DocBook/media/dvb/dvbapi.xml b/Documentation/DocBook/media/dvb/dvbapi.xml new file mode 100644 index 00000000000..4c15396c67e --- /dev/null +++ b/Documentation/DocBook/media/dvb/dvbapi.xml @@ -0,0 +1,141 @@ +<partinfo> +<authorgroup> +<author> +<firstname>Ralph</firstname> +<surname>Metzler</surname> +<othername role="mi">J. K.</othername> +<affiliation><address><email>rjkm@metzlerbros.de</email></address></affiliation> +</author> +<author> +<firstname>Marcus</firstname> +<surname>Metzler</surname> +<othername role="mi">O. C.</othername> +<affiliation><address><email>rjkm@metzlerbros.de</email></address></affiliation> +</author> +</authorgroup> +<authorgroup> +<author> +<firstname>Mauro</firstname> +<othername role="mi">Carvalho</othername> +<surname>Chehab</surname> +<affiliation><address><email>m.chehab@samsung.com</email></address></affiliation> +<contrib>Ported document to Docbook XML.</contrib> +</author> +</authorgroup> +<copyright> + <year>2002</year> + <year>2003</year> + <holder>Convergence GmbH</holder> +</copyright> +<copyright> + <year>2009-2014</year> + <holder>Mauro Carvalho Chehab</holder> +</copyright> + +<revhistory> +<!-- Put document revisions here, newest first. --> +<revision> + <revnumber>2.0.4</revnumber> + <date>2011-05-06</date> + <authorinitials>mcc</authorinitials> + <revremark> + Add more information about DVB APIv5, better describing the frontend GET/SET props ioctl's. + </revremark> +</revision> +<revision> + <revnumber>2.0.3</revnumber> + <date>2010-07-03</date> + <authorinitials>mcc</authorinitials> + <revremark> + Add some frontend capabilities flags, present on kernel, but missing at the specs. + </revremark> +</revision> +<revision> + <revnumber>2.0.2</revnumber> + <date>2009-10-25</date> + <authorinitials>mcc</authorinitials> + <revremark> + documents FE_SET_FRONTEND_TUNE_MODE and FE_DISHETWORK_SEND_LEGACY_CMD ioctls. + </revremark> +</revision> +<revision> +<revnumber>2.0.1</revnumber> +<date>2009-09-16</date> +<authorinitials>mcc</authorinitials> +<revremark> +Added ISDB-T test originally written by Patrick Boettcher +</revremark> +</revision> +<revision> +<revnumber>2.0.0</revnumber> +<date>2009-09-06</date> +<authorinitials>mcc</authorinitials> +<revremark>Conversion from LaTex to DocBook XML. The + contents is the same as the original LaTex version.</revremark> +</revision> +<revision> +<revnumber>1.0.0</revnumber> +<date>2003-07-24</date> +<authorinitials>rjkm</authorinitials> +<revremark>Initial revision on LaTEX.</revremark> +</revision> +</revhistory> +</partinfo> + + +<title>LINUX DVB API</title> +<subtitle>Version 5.10</subtitle> +<!-- ADD THE CHAPTERS HERE --> + <chapter id="dvb_introdution"> + &sub-intro; + </chapter> + <chapter id="dvb_frontend"> + &sub-frontend; + </chapter> + <chapter id="dvb_demux"> + &sub-demux; + </chapter> + <chapter id="dvb_video"> + &sub-video; + </chapter> + <chapter id="dvb_audio"> + &sub-audio; + </chapter> + <chapter id="dvb_ca"> + &sub-ca; + </chapter> + <chapter id="dvb_net"> + &sub-net; + </chapter> + <chapter id="dvb_kdapi"> + &sub-kdapi; + </chapter> + <chapter id="dvb_examples"> + &sub-examples; + </chapter> +<!-- END OF CHAPTERS --> + <appendix id="audio_h"> + <title>DVB Audio Header File</title> + &sub-audio-h; + </appendix> + <appendix id="ca_h"> + <title>DVB Conditional Access Header File</title> + &sub-ca-h; + </appendix> + <appendix id="dmx_h"> + <title>DVB Demux Header File</title> + &sub-dmx-h; + </appendix> + <appendix id="frontend_h"> + <title>DVB Frontend Header File</title> + &sub-frontend-h; + </appendix> + <appendix id="net_h"> + <title>DVB Network Header File</title> + &sub-net-h; + </appendix> + <appendix id="video_h"> + <title>DVB Video Header File</title> + &sub-video-h; + </appendix> + diff --git a/Documentation/DocBook/media/dvb/dvbproperty.xml b/Documentation/DocBook/media/dvb/dvbproperty.xml new file mode 100644 index 00000000000..24c22cabc66 --- /dev/null +++ b/Documentation/DocBook/media/dvb/dvbproperty.xml @@ -0,0 +1,1281 @@ +<section id="FE_GET_SET_PROPERTY"> +<title><constant>FE_GET_PROPERTY/FE_SET_PROPERTY</constant></title> +<para>This section describes the DVB version 5 extension of the DVB-API, also +called "S2API", as this API were added to provide support for DVB-S2. It was +designed to be able to replace the old frontend API. Yet, the DISEQC and +the capability ioctls weren't implemented yet via the new way.</para> +<para>The typical usage for the <constant>FE_GET_PROPERTY/FE_SET_PROPERTY</constant> +API is to replace the ioctl's were the <link linkend="dvb-frontend-parameters"> +struct <constant>dvb_frontend_parameters</constant></link> were used.</para> +<section id="dtv-stats"> +<title>DTV stats type</title> +<programlisting> +struct dtv_stats { + __u8 scale; /* enum fecap_scale_params type */ + union { + __u64 uvalue; /* for counters and relative scales */ + __s64 svalue; /* for 1/1000 dB measures */ + }; +} __packed; +</programlisting> +</section> +<section id="dtv-fe-stats"> +<title>DTV stats type</title> +<programlisting> +#define MAX_DTV_STATS 4 + +struct dtv_fe_stats { + __u8 len; + struct dtv_stats stat[MAX_DTV_STATS]; +} __packed; +</programlisting> +</section> + +<section id="dtv-property"> +<title>DTV property type</title> +<programlisting> +/* Reserved fields should be set to 0 */ + +struct dtv_property { + __u32 cmd; + __u32 reserved[3]; + union { + __u32 data; + struct dtv_fe_stats st; + struct { + __u8 data[32]; + __u32 len; + __u32 reserved1[3]; + void *reserved2; + } buffer; + } u; + int result; +} __attribute__ ((packed)); + +/* num of properties cannot exceed DTV_IOCTL_MAX_MSGS per ioctl */ +#define DTV_IOCTL_MAX_MSGS 64 +</programlisting> +</section> +<section id="dtv-properties"> +<title>DTV properties type</title> +<programlisting> +struct dtv_properties { + __u32 num; + struct dtv_property *props; +}; +</programlisting> +</section> + +<section id="FE_GET_PROPERTY"> +<title>FE_GET_PROPERTY</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call returns one or more frontend properties. This call only + requires read-only access to the device.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = <link linkend="FE_GET_PROPERTY">FE_GET_PROPERTY</link>, + dtv_properties ⋆props);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int num</para> +</entry><entry + align="char"> +<para>Equals <link linkend="FE_GET_PROPERTY">FE_GET_PROPERTY</link> for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>struct dtv_property *props</para> +</entry><entry + align="char"> +<para>Points to the location where the front-end property commands are stored.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +<informaltable><tgroup cols="2"><tbody><row> + <entry align="char"><para>EOPNOTSUPP</para></entry> + <entry align="char"><para>Property type not supported.</para></entry> + </row></tbody></tgroup></informaltable> +</section> + +<section id="FE_SET_PROPERTY"> +<title>FE_SET_PROPERTY</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call sets one or more frontend properties. This call only + requires read-only access to the device.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = <link linkend="FE_SET_PROPERTY">FE_SET_PROPERTY</link>, + dtv_properties ⋆props);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int num</para> +</entry><entry + align="char"> +<para>Equals <link linkend="FE_SET_PROPERTY">FE_SET_PROPERTY</link> for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>struct dtv_property *props</para> +</entry><entry + align="char"> +<para>Points to the location where the front-end property commands are stored.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +<informaltable><tgroup cols="2"><tbody><row> + <entry align="char"><para>EOPNOTSUPP</para></entry> + <entry align="char"><para>Property type not supported.</para></entry> + </row></tbody></tgroup></informaltable> +</section> + +<section> + <title>Property types</title> +<para> +On <link linkend="FE_GET_PROPERTY">FE_GET_PROPERTY</link>/<link linkend="FE_SET_PROPERTY">FE_SET_PROPERTY</link>, +the actual action is determined by the dtv_property cmd/data pairs. With one single ioctl, is possible to +get/set up to 64 properties. The actual meaning of each property is described on the next sections. +</para> + +<para>The available frontend property types are shown on the next section.</para> +</section> + +<section id="fe_property_parameters"> + <title>Digital TV property parameters</title> + <section id="DTV-UNDEFINED"> + <title><constant>DTV_UNDEFINED</constant></title> + <para>Used internally. A GET/SET operation for it won't change or return anything.</para> + </section> + <section id="DTV-TUNE"> + <title><constant>DTV_TUNE</constant></title> + <para>Interpret the cache of data, build either a traditional frontend tunerequest so we can pass validation in the <constant>FE_SET_FRONTEND</constant> ioctl.</para> + </section> + <section id="DTV-CLEAR"> + <title><constant>DTV_CLEAR</constant></title> + <para>Reset a cache of data specific to the frontend here. This does not effect hardware.</para> + </section> + <section id="DTV-FREQUENCY"> + <title><constant>DTV_FREQUENCY</constant></title> + + <para>Central frequency of the channel.</para> + + <para>Notes:</para> + <para>1)For satellital delivery systems, it is measured in kHz. + For the other ones, it is measured in Hz.</para> + <para>2)For ISDB-T, the channels are usually transmitted with an offset of 143kHz. + E.g. a valid frequency could be 474143 kHz. The stepping is bound to the bandwidth of + the channel which is 6MHz.</para> + + <para>3)As in ISDB-Tsb the channel consists of only one or three segments the + frequency step is 429kHz, 3*429 respectively. As for ISDB-T the + central frequency of the channel is expected.</para> + </section> + <section id="DTV-MODULATION"> + <title><constant>DTV_MODULATION</constant></title> +<para>Specifies the frontend modulation type for cable and satellite types. The modulation can be one of the types bellow:</para> +<programlisting> + typedef enum fe_modulation { + QPSK, + QAM_16, + QAM_32, + QAM_64, + QAM_128, + QAM_256, + QAM_AUTO, + VSB_8, + VSB_16, + PSK_8, + APSK_16, + APSK_32, + DQPSK, + QAM_4_NR, + } fe_modulation_t; +</programlisting> + </section> + <section id="DTV-BANDWIDTH-HZ"> + <title><constant>DTV_BANDWIDTH_HZ</constant></title> + + <para>Bandwidth for the channel, in HZ.</para> + + <para>Possible values: + <constant>1712000</constant>, + <constant>5000000</constant>, + <constant>6000000</constant>, + <constant>7000000</constant>, + <constant>8000000</constant>, + <constant>10000000</constant>. + </para> + + <para>Notes:</para> + + <para>1) For ISDB-T it should be always 6000000Hz (6MHz)</para> + <para>2) For ISDB-Tsb it can vary depending on the number of connected segments</para> + <para>3) Bandwidth doesn't apply for DVB-C transmissions, as the bandwidth + for DVB-C depends on the symbol rate</para> + <para>4) Bandwidth in ISDB-T is fixed (6MHz) or can be easily derived from + other parameters (DTV_ISDBT_SB_SEGMENT_IDX, + DTV_ISDBT_SB_SEGMENT_COUNT).</para> + <para>5) DVB-T supports 6, 7 and 8MHz.</para> + <para>6) In addition, DVB-T2 supports 1.172, 5 and 10MHz.</para> + </section> + <section id="DTV-INVERSION"> + <title><constant>DTV_INVERSION</constant></title> + <para>The Inversion field can take one of these values: + </para> + <programlisting> + typedef enum fe_spectral_inversion { + INVERSION_OFF, + INVERSION_ON, + INVERSION_AUTO + } fe_spectral_inversion_t; + </programlisting> + <para>It indicates if spectral inversion should be presumed or not. In the automatic setting + (<constant>INVERSION_AUTO</constant>) the hardware will try to figure out the correct setting by + itself. + </para> + </section> + <section id="DTV-DISEQC-MASTER"> + <title><constant>DTV_DISEQC_MASTER</constant></title> + <para>Currently not implemented.</para> + </section> + <section id="DTV-SYMBOL-RATE"> + <title><constant>DTV_SYMBOL_RATE</constant></title> + <para>Digital TV symbol rate, in bauds (symbols/second). Used on cable standards.</para> + </section> + <section id="DTV-INNER-FEC"> + <title><constant>DTV_INNER_FEC</constant></title> + <para>Used cable/satellite transmissions. The acceptable values are: + </para> + <programlisting> +typedef enum fe_code_rate { + FEC_NONE = 0, + FEC_1_2, + FEC_2_3, + FEC_3_4, + FEC_4_5, + FEC_5_6, + FEC_6_7, + FEC_7_8, + FEC_8_9, + FEC_AUTO, + FEC_3_5, + FEC_9_10, + FEC_2_5, +} fe_code_rate_t; + </programlisting> + <para>which correspond to error correction rates of 1/2, 2/3, etc., + no error correction or auto detection.</para> + </section> + <section id="DTV-VOLTAGE"> + <title><constant>DTV_VOLTAGE</constant></title> + <para>The voltage is usually used with non-DiSEqC capable LNBs to switch + the polarzation (horizontal/vertical). When using DiSEqC epuipment this + voltage has to be switched consistently to the DiSEqC commands as + described in the DiSEqC spec.</para> + <programlisting> + typedef enum fe_sec_voltage { + SEC_VOLTAGE_13, + SEC_VOLTAGE_18 + } fe_sec_voltage_t; + </programlisting> + </section> + <section id="DTV-TONE"> + <title><constant>DTV_TONE</constant></title> + <para>Currently not used.</para> + </section> + <section id="DTV-PILOT"> + <title><constant>DTV_PILOT</constant></title> + <para>Sets DVB-S2 pilot</para> + <section id="fe-pilot-t"> + <title>fe_pilot type</title> + <programlisting> +typedef enum fe_pilot { + PILOT_ON, + PILOT_OFF, + PILOT_AUTO, +} fe_pilot_t; + </programlisting> + </section> + </section> + <section id="DTV-ROLLOFF"> + <title><constant>DTV_ROLLOFF</constant></title> + <para>Sets DVB-S2 rolloff</para> + + <section id="fe-rolloff-t"> + <title>fe_rolloff type</title> + <programlisting> +typedef enum fe_rolloff { + ROLLOFF_35, /* Implied value in DVB-S, default for DVB-S2 */ + ROLLOFF_20, + ROLLOFF_25, + ROLLOFF_AUTO, +} fe_rolloff_t; + </programlisting> + </section> + </section> + <section id="DTV-DISEQC-SLAVE-REPLY"> + <title><constant>DTV_DISEQC_SLAVE_REPLY</constant></title> + <para>Currently not implemented.</para> + </section> + <section id="DTV-FE-CAPABILITY-COUNT"> + <title><constant>DTV_FE_CAPABILITY_COUNT</constant></title> + <para>Currently not implemented.</para> + </section> + <section id="DTV-FE-CAPABILITY"> + <title><constant>DTV_FE_CAPABILITY</constant></title> + <para>Currently not implemented.</para> + </section> + <section id="DTV-DELIVERY-SYSTEM"> + <title><constant>DTV_DELIVERY_SYSTEM</constant></title> + <para>Specifies the type of Delivery system</para> + <section id="fe-delivery-system-t"> + <title>fe_delivery_system type</title> + <para>Possible values: </para> +<programlisting> + +typedef enum fe_delivery_system { + SYS_UNDEFINED, + SYS_DVBC_ANNEX_A, + SYS_DVBC_ANNEX_B, + SYS_DVBT, + SYS_DSS, + SYS_DVBS, + SYS_DVBS2, + SYS_DVBH, + SYS_ISDBT, + SYS_ISDBS, + SYS_ISDBC, + SYS_ATSC, + SYS_ATSCMH, + SYS_DTMB, + SYS_CMMB, + SYS_DAB, + SYS_DVBT2, + SYS_TURBO, + SYS_DVBC_ANNEX_C, +} fe_delivery_system_t; +</programlisting> + </section> + </section> + <section id="DTV-ISDBT-PARTIAL-RECEPTION"> + <title><constant>DTV_ISDBT_PARTIAL_RECEPTION</constant></title> + + <para>If <constant>DTV_ISDBT_SOUND_BROADCASTING</constant> is '0' this bit-field represents whether + the channel is in partial reception mode or not.</para> + + <para>If '1' <constant>DTV_ISDBT_LAYERA_*</constant> values are assigned to the center segment and + <constant>DTV_ISDBT_LAYERA_SEGMENT_COUNT</constant> has to be '1'.</para> + + <para>If in addition <constant>DTV_ISDBT_SOUND_BROADCASTING</constant> is '1' + <constant>DTV_ISDBT_PARTIAL_RECEPTION</constant> represents whether this ISDB-Tsb channel + is consisting of one segment and layer or three segments and two layers.</para> + + <para>Possible values: 0, 1, -1 (AUTO)</para> + </section> + <section id="DTV-ISDBT-SOUND-BROADCASTING"> + <title><constant>DTV_ISDBT_SOUND_BROADCASTING</constant></title> + + <para>This field represents whether the other DTV_ISDBT_*-parameters are + referring to an ISDB-T and an ISDB-Tsb channel. (See also + <constant>DTV_ISDBT_PARTIAL_RECEPTION</constant>).</para> + + <para>Possible values: 0, 1, -1 (AUTO)</para> + </section> + <section id="DTV-ISDBT-SB-SUBCHANNEL-ID"> + <title><constant>DTV_ISDBT_SB_SUBCHANNEL_ID</constant></title> + + <para>This field only applies if <constant>DTV_ISDBT_SOUND_BROADCASTING</constant> is '1'.</para> + + <para>(Note of the author: This might not be the correct description of the + <constant>SUBCHANNEL-ID</constant> in all details, but it is my understanding of the technical + background needed to program a device)</para> + + <para>An ISDB-Tsb channel (1 or 3 segments) can be broadcasted alone or in a + set of connected ISDB-Tsb channels. In this set of channels every + channel can be received independently. The number of connected + ISDB-Tsb segment can vary, e.g. depending on the frequency spectrum + bandwidth available.</para> + + <para>Example: Assume 8 ISDB-Tsb connected segments are broadcasted. The + broadcaster has several possibilities to put those channels in the + air: Assuming a normal 13-segment ISDB-T spectrum he can align the 8 + segments from position 1-8 to 5-13 or anything in between.</para> + + <para>The underlying layer of segments are subchannels: each segment is + consisting of several subchannels with a predefined IDs. A sub-channel + is used to help the demodulator to synchronize on the channel.</para> + + <para>An ISDB-T channel is always centered over all sub-channels. As for + the example above, in ISDB-Tsb it is no longer as simple as that.</para> + + <para><constant>The DTV_ISDBT_SB_SUBCHANNEL_ID</constant> parameter is used to give the + sub-channel ID of the segment to be demodulated.</para> + + <para>Possible values: 0 .. 41, -1 (AUTO)</para> + </section> + <section id="DTV-ISDBT-SB-SEGMENT-IDX"> + <title><constant>DTV_ISDBT_SB_SEGMENT_IDX</constant></title> + <para>This field only applies if <constant>DTV_ISDBT_SOUND_BROADCASTING</constant> is '1'.</para> + <para><constant>DTV_ISDBT_SB_SEGMENT_IDX</constant> gives the index of the segment to be + demodulated for an ISDB-Tsb channel where several of them are + transmitted in the connected manner.</para> + <para>Possible values: 0 .. <constant>DTV_ISDBT_SB_SEGMENT_COUNT</constant> - 1</para> + <para>Note: This value cannot be determined by an automatic channel search.</para> + </section> + <section id="DTV-ISDBT-SB-SEGMENT-COUNT"> + <title><constant>DTV_ISDBT_SB_SEGMENT_COUNT</constant></title> + <para>This field only applies if <constant>DTV_ISDBT_SOUND_BROADCASTING</constant> is '1'.</para> + <para><constant>DTV_ISDBT_SB_SEGMENT_COUNT</constant> gives the total count of connected ISDB-Tsb + channels.</para> + <para>Possible values: 1 .. 13</para> + <para>Note: This value cannot be determined by an automatic channel search.</para> + </section> + <section id="isdb-hierq-layers"> + <title><constant>DTV-ISDBT-LAYER*</constant> parameters</title> + <para>ISDB-T channels can be coded hierarchically. As opposed to DVB-T in + ISDB-T hierarchical layers can be decoded simultaneously. For that + reason a ISDB-T demodulator has 3 Viterbi and 3 Reed-Solomon decoders.</para> + <para>ISDB-T has 3 hierarchical layers which each can use a part of the + available segments. The total number of segments over all layers has + to 13 in ISDB-T.</para> + <para>There are 3 parameter sets, for Layers A, B and C.</para> + <section id="DTV-ISDBT-LAYER-ENABLED"> + <title><constant>DTV_ISDBT_LAYER_ENABLED</constant></title> + <para>Hierarchical reception in ISDB-T is achieved by enabling or disabling + layers in the decoding process. Setting all bits of + <constant>DTV_ISDBT_LAYER_ENABLED</constant> to '1' forces all layers (if applicable) to be + demodulated. This is the default.</para> + <para>If the channel is in the partial reception mode + (<constant>DTV_ISDBT_PARTIAL_RECEPTION</constant> = 1) the central segment can be decoded + independently of the other 12 segments. In that mode layer A has to + have a <constant>SEGMENT_COUNT</constant> of 1.</para> + <para>In ISDB-Tsb only layer A is used, it can be 1 or 3 in ISDB-Tsb + according to <constant>DTV_ISDBT_PARTIAL_RECEPTION</constant>. <constant>SEGMENT_COUNT</constant> must be filled + accordingly.</para> + <para>Possible values: 0x1, 0x2, 0x4 (|-able)</para> + <para><constant>DTV_ISDBT_LAYER_ENABLED[0:0]</constant> - layer A</para> + <para><constant>DTV_ISDBT_LAYER_ENABLED[1:1]</constant> - layer B</para> + <para><constant>DTV_ISDBT_LAYER_ENABLED[2:2]</constant> - layer C</para> + <para><constant>DTV_ISDBT_LAYER_ENABLED[31:3]</constant> unused</para> + </section> + <section id="DTV-ISDBT-LAYER-FEC"> + <title><constant>DTV_ISDBT_LAYER*_FEC</constant></title> + <para>Possible values: <constant>FEC_AUTO</constant>, <constant>FEC_1_2</constant>, <constant>FEC_2_3</constant>, <constant>FEC_3_4</constant>, <constant>FEC_5_6</constant>, <constant>FEC_7_8</constant></para> + </section> + <section id="DTV-ISDBT-LAYER-MODULATION"> + <title><constant>DTV_ISDBT_LAYER*_MODULATION</constant></title> + <para>Possible values: <constant>QAM_AUTO</constant>, QP<constant>SK, QAM_16</constant>, <constant>QAM_64</constant>, <constant>DQPSK</constant></para> + <para>Note: If layer C is <constant>DQPSK</constant> layer B has to be <constant>DQPSK</constant>. If layer B is <constant>DQPSK</constant> + and <constant>DTV_ISDBT_PARTIAL_RECEPTION</constant>=0 layer has to be <constant>DQPSK</constant>.</para> + </section> + <section id="DTV-ISDBT-LAYER-SEGMENT-COUNT"> + <title><constant>DTV_ISDBT_LAYER*_SEGMENT_COUNT</constant></title> + <para>Possible values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, -1 (AUTO)</para> + <para>Note: Truth table for <constant>DTV_ISDBT_SOUND_BROADCASTING</constant> and + <constant>DTV_ISDBT_PARTIAL_RECEPTION</constant> and <constant>LAYER</constant>*_SEGMENT_COUNT</para> + <informaltable id="isdbt-layer_seg-cnt-table"> + <tgroup cols="6"> + <tbody> + <row> + <entry>PR</entry> + <entry>SB</entry> + <entry>Layer A width</entry> + <entry>Layer B width</entry> + <entry>Layer C width</entry> + <entry>total width</entry> + </row> + <row> + <entry>0</entry> + <entry>0</entry> + <entry>1 .. 13</entry> + <entry>1 .. 13</entry> + <entry>1 .. 13</entry> + <entry>13</entry> + </row> + <row> + <entry>1</entry> + <entry>0</entry> + <entry>1</entry> + <entry>1 .. 13</entry> + <entry>1 .. 13</entry> + <entry>13</entry> + </row> + <row> + <entry>0</entry> + <entry>1</entry> + <entry>1</entry> + <entry>0</entry> + <entry>0</entry> + <entry>1</entry> + </row> + <row> + <entry>1</entry> + <entry>1</entry> + <entry>1</entry> + <entry>2</entry> + <entry>0</entry> + <entry>13</entry> + </row> + </tbody> + </tgroup> + </informaltable> + </section> + <section id="DTV-ISDBT-LAYER-TIME-INTERLEAVING"> + <title><constant>DTV_ISDBT_LAYER*_TIME_INTERLEAVING</constant></title> + <para>Possible values: 0, 1, 2, 3, -1 (AUTO)</para> + <para>Note: The real inter-leaver depth-names depend on the mode (fft-size); the values + here are referring to what can be found in the TMCC-structure - + independent of the mode.</para> + </section> + <section id="DTV-ATSCMH-FIC-VER"> + <title><constant>DTV_ATSCMH_FIC_VER</constant></title> + <para>Version number of the FIC (Fast Information Channel) signaling data.</para> + <para>FIC is used for relaying information to allow rapid service acquisition by the receiver.</para> + <para>Possible values: 0, 1, 2, 3, ..., 30, 31</para> + </section> + <section id="DTV-ATSCMH-PARADE-ID"> + <title><constant>DTV_ATSCMH_PARADE_ID</constant></title> + <para>Parade identification number</para> + <para>A parade is a collection of up to eight MH groups, conveying one or two ensembles.</para> + <para>Possible values: 0, 1, 2, 3, ..., 126, 127</para> + </section> + <section id="DTV-ATSCMH-NOG"> + <title><constant>DTV_ATSCMH_NOG</constant></title> + <para>Number of MH groups per MH subframe for a designated parade.</para> + <para>Possible values: 1, 2, 3, 4, 5, 6, 7, 8</para> + </section> + <section id="DTV-ATSCMH-TNOG"> + <title><constant>DTV_ATSCMH_TNOG</constant></title> + <para>Total number of MH groups including all MH groups belonging to all MH parades in one MH subframe.</para> + <para>Possible values: 0, 1, 2, 3, ..., 30, 31</para> + </section> + <section id="DTV-ATSCMH-SGN"> + <title><constant>DTV_ATSCMH_SGN</constant></title> + <para>Start group number.</para> + <para>Possible values: 0, 1, 2, 3, ..., 14, 15</para> + </section> + <section id="DTV-ATSCMH-PRC"> + <title><constant>DTV_ATSCMH_PRC</constant></title> + <para>Parade repetition cycle.</para> + <para>Possible values: 1, 2, 3, 4, 5, 6, 7, 8</para> + </section> + <section id="DTV-ATSCMH-RS-FRAME-MODE"> + <title><constant>DTV_ATSCMH_RS_FRAME_MODE</constant></title> + <para>RS frame mode.</para> + <para>Possible values are:</para> + <para id="atscmh-rs-frame-mode"> +<programlisting> +typedef enum atscmh_rs_frame_mode { + ATSCMH_RSFRAME_PRI_ONLY = 0, + ATSCMH_RSFRAME_PRI_SEC = 1, +} atscmh_rs_frame_mode_t; +</programlisting> + </para> + </section> + <section id="DTV-ATSCMH-RS-FRAME-ENSEMBLE"> + <title><constant>DTV_ATSCMH_RS_FRAME_ENSEMBLE</constant></title> + <para>RS frame ensemble.</para> + <para>Possible values are:</para> + <para id="atscmh-rs-frame-ensemble"> +<programlisting> +typedef enum atscmh_rs_frame_ensemble { + ATSCMH_RSFRAME_ENS_PRI = 0, + ATSCMH_RSFRAME_ENS_SEC = 1, +} atscmh_rs_frame_ensemble_t; +</programlisting> + </para> + </section> + <section id="DTV-ATSCMH-RS-CODE-MODE-PRI"> + <title><constant>DTV_ATSCMH_RS_CODE_MODE_PRI</constant></title> + <para>RS code mode (primary).</para> + <para>Possible values are:</para> + <para id="atscmh-rs-code-mode"> +<programlisting> +typedef enum atscmh_rs_code_mode { + ATSCMH_RSCODE_211_187 = 0, + ATSCMH_RSCODE_223_187 = 1, + ATSCMH_RSCODE_235_187 = 2, +} atscmh_rs_code_mode_t; +</programlisting> + </para> + </section> + <section id="DTV-ATSCMH-RS-CODE-MODE-SEC"> + <title><constant>DTV_ATSCMH_RS_CODE_MODE_SEC</constant></title> + <para>RS code mode (secondary).</para> + <para>Possible values are:</para> +<programlisting> +typedef enum atscmh_rs_code_mode { + ATSCMH_RSCODE_211_187 = 0, + ATSCMH_RSCODE_223_187 = 1, + ATSCMH_RSCODE_235_187 = 2, +} atscmh_rs_code_mode_t; +</programlisting> + </section> + <section id="DTV-ATSCMH-SCCC-BLOCK-MODE"> + <title><constant>DTV_ATSCMH_SCCC_BLOCK_MODE</constant></title> + <para>Series Concatenated Convolutional Code Block Mode.</para> + <para>Possible values are:</para> + <para id="atscmh-sccc-block-mode"> +<programlisting> +typedef enum atscmh_sccc_block_mode { + ATSCMH_SCCC_BLK_SEP = 0, + ATSCMH_SCCC_BLK_COMB = 1, +} atscmh_sccc_block_mode_t; +</programlisting> + </para> + </section> + <section id="DTV-ATSCMH-SCCC-CODE-MODE-A"> + <title><constant>DTV_ATSCMH_SCCC_CODE_MODE_A</constant></title> + <para>Series Concatenated Convolutional Code Rate.</para> + <para>Possible values are:</para> + <para id="atscmh-sccc-code-mode"> +<programlisting> +typedef enum atscmh_sccc_code_mode { + ATSCMH_SCCC_CODE_HLF = 0, + ATSCMH_SCCC_CODE_QTR = 1, +} atscmh_sccc_code_mode_t; +</programlisting> + </para> + </section> + <section id="DTV-ATSCMH-SCCC-CODE-MODE-B"> + <title><constant>DTV_ATSCMH_SCCC_CODE_MODE_B</constant></title> + <para>Series Concatenated Convolutional Code Rate.</para> + <para>Possible values are:</para> +<programlisting> +typedef enum atscmh_sccc_code_mode { + ATSCMH_SCCC_CODE_HLF = 0, + ATSCMH_SCCC_CODE_QTR = 1, +} atscmh_sccc_code_mode_t; +</programlisting> + </section> + <section id="DTV-ATSCMH-SCCC-CODE-MODE-C"> + <title><constant>DTV_ATSCMH_SCCC_CODE_MODE_C</constant></title> + <para>Series Concatenated Convolutional Code Rate.</para> + <para>Possible values are:</para> +<programlisting> +typedef enum atscmh_sccc_code_mode { + ATSCMH_SCCC_CODE_HLF = 0, + ATSCMH_SCCC_CODE_QTR = 1, +} atscmh_sccc_code_mode_t; +</programlisting> + </section> + <section id="DTV-ATSCMH-SCCC-CODE-MODE-D"> + <title><constant>DTV_ATSCMH_SCCC_CODE_MODE_D</constant></title> + <para>Series Concatenated Convolutional Code Rate.</para> + <para>Possible values are:</para> +<programlisting> +typedef enum atscmh_sccc_code_mode { + ATSCMH_SCCC_CODE_HLF = 0, + ATSCMH_SCCC_CODE_QTR = 1, +} atscmh_sccc_code_mode_t; +</programlisting> + </section> + </section> + <section id="DTV-API-VERSION"> + <title><constant>DTV_API_VERSION</constant></title> + <para>Returns the major/minor version of the DVB API</para> + </section> + <section id="DTV-CODE-RATE-HP"> + <title><constant>DTV_CODE_RATE_HP</constant></title> + <para>Used on terrestrial transmissions. The acceptable values are: + </para> + <programlisting> +typedef enum fe_code_rate { + FEC_NONE = 0, + FEC_1_2, + FEC_2_3, + FEC_3_4, + FEC_4_5, + FEC_5_6, + FEC_6_7, + FEC_7_8, + FEC_8_9, + FEC_AUTO, + FEC_3_5, + FEC_9_10, +} fe_code_rate_t; + </programlisting> + </section> + <section id="DTV-CODE-RATE-LP"> + <title><constant>DTV_CODE_RATE_LP</constant></title> + <para>Used on terrestrial transmissions. The acceptable values are: + </para> + <programlisting> +typedef enum fe_code_rate { + FEC_NONE = 0, + FEC_1_2, + FEC_2_3, + FEC_3_4, + FEC_4_5, + FEC_5_6, + FEC_6_7, + FEC_7_8, + FEC_8_9, + FEC_AUTO, + FEC_3_5, + FEC_9_10, +} fe_code_rate_t; + </programlisting> + </section> + <section id="DTV-GUARD-INTERVAL"> + <title><constant>DTV_GUARD_INTERVAL</constant></title> + + <para>Possible values are:</para> +<programlisting> +typedef enum fe_guard_interval { + GUARD_INTERVAL_1_32, + GUARD_INTERVAL_1_16, + GUARD_INTERVAL_1_8, + GUARD_INTERVAL_1_4, + GUARD_INTERVAL_AUTO, + GUARD_INTERVAL_1_128, + GUARD_INTERVAL_19_128, + GUARD_INTERVAL_19_256, + GUARD_INTERVAL_PN420, + GUARD_INTERVAL_PN595, + GUARD_INTERVAL_PN945, +} fe_guard_interval_t; +</programlisting> + + <para>Notes:</para> + <para>1) If <constant>DTV_GUARD_INTERVAL</constant> is set the <constant>GUARD_INTERVAL_AUTO</constant> the hardware will + try to find the correct guard interval (if capable) and will use TMCC to fill + in the missing parameters.</para> + <para>2) Intervals 1/128, 19/128 and 19/256 are used only for DVB-T2 at present</para> + <para>3) DTMB specifies PN420, PN595 and PN945.</para> + </section> + <section id="DTV-TRANSMISSION-MODE"> + <title><constant>DTV_TRANSMISSION_MODE</constant></title> + + <para>Specifies the number of carriers used by the standard</para> + + <para>Possible values are:</para> +<programlisting> +typedef enum fe_transmit_mode { + TRANSMISSION_MODE_2K, + TRANSMISSION_MODE_8K, + TRANSMISSION_MODE_AUTO, + TRANSMISSION_MODE_4K, + TRANSMISSION_MODE_1K, + TRANSMISSION_MODE_16K, + TRANSMISSION_MODE_32K, + TRANSMISSION_MODE_C1, + TRANSMISSION_MODE_C3780, +} fe_transmit_mode_t; +</programlisting> + <para>Notes:</para> + <para>1) ISDB-T supports three carrier/symbol-size: 8K, 4K, 2K. It is called + 'mode' in the standard: Mode 1 is 2K, mode 2 is 4K, mode 3 is 8K</para> + + <para>2) If <constant>DTV_TRANSMISSION_MODE</constant> is set the <constant>TRANSMISSION_MODE_AUTO</constant> the + hardware will try to find the correct FFT-size (if capable) and will + use TMCC to fill in the missing parameters.</para> + <para>3) DVB-T specifies 2K and 8K as valid sizes.</para> + <para>4) DVB-T2 specifies 1K, 2K, 4K, 8K, 16K and 32K.</para> + <para>5) DTMB specifies C1 and C3780.</para> + </section> + <section id="DTV-HIERARCHY"> + <title><constant>DTV_HIERARCHY</constant></title> + <para>Frontend hierarchy</para> + <programlisting> +typedef enum fe_hierarchy { + HIERARCHY_NONE, + HIERARCHY_1, + HIERARCHY_2, + HIERARCHY_4, + HIERARCHY_AUTO + } fe_hierarchy_t; + </programlisting> + </section> + <section id="DTV-STREAM-ID"> + <title><constant>DTV_STREAM_ID</constant></title> + <para>DVB-S2, DVB-T2 and ISDB-S support the transmission of several + streams on a single transport stream. + This property enables the DVB driver to handle substream filtering, + when supported by the hardware. + By default, substream filtering is disabled. + </para><para> + For DVB-S2 and DVB-T2, the valid substream id range is from 0 to 255. + </para><para> + For ISDB, the valid substream id range is from 1 to 65535. + </para><para> + To disable it, you should use the special macro NO_STREAM_ID_FILTER. + </para><para> + Note: any value outside the id range also disables filtering. + </para> + </section> + <section id="DTV-DVBT2-PLP-ID-LEGACY"> + <title><constant>DTV_DVBT2_PLP_ID_LEGACY</constant></title> + <para>Obsolete, replaced with DTV_STREAM_ID.</para> + </section> + <section id="DTV-ENUM-DELSYS"> + <title><constant>DTV_ENUM_DELSYS</constant></title> + <para>A Multi standard frontend needs to advertise the delivery systems provided. + Applications need to enumerate the provided delivery systems, before using + any other operation with the frontend. Prior to it's introduction, + FE_GET_INFO was used to determine a frontend type. A frontend which + provides more than a single delivery system, FE_GET_INFO doesn't help much. + Applications which intends to use a multistandard frontend must enumerate + the delivery systems associated with it, rather than trying to use + FE_GET_INFO. In the case of a legacy frontend, the result is just the same + as with FE_GET_INFO, but in a more structured format </para> + </section> + <section id="DTV-INTERLEAVING"> + <title><constant>DTV_INTERLEAVING</constant></title> + <para id="fe-interleaving">Interleaving mode</para> + <programlisting> +enum fe_interleaving { + INTERLEAVING_NONE, + INTERLEAVING_AUTO, + INTERLEAVING_240, + INTERLEAVING_720, +}; + </programlisting> + </section> + <section id="DTV-LNA"> + <title><constant>DTV_LNA</constant></title> + <para>Low-noise amplifier.</para> + <para>Hardware might offer controllable LNA which can be set manually + using that parameter. Usually LNA could be found only from + terrestrial devices if at all.</para> + <para>Possible values: 0, 1, LNA_AUTO</para> + <para>0, LNA off</para> + <para>1, LNA on</para> + <para>use the special macro LNA_AUTO to set LNA auto</para> + </section> +</section> + + <section id="frontend-stat-properties"> + <title>Frontend statistics indicators</title> + <para>The values are returned via <constant>dtv_property.stat</constant>. + If the property is supported, <constant>dtv_property.stat.len</constant> is bigger than zero.</para> + <para>For most delivery systems, <constant>dtv_property.stat.len</constant> + will be 1 if the stats is supported, and the properties will + return a single value for each parameter.</para> + <para>It should be noticed, however, that new OFDM delivery systems + like ISDB can use different modulation types for each group of + carriers. On such standards, up to 3 groups of statistics can be + provided, and <constant>dtv_property.stat.len</constant> is updated + to reflect the "global" metrics, plus one metric per each carrier + group (called "layer" on ISDB).</para> + <para>So, in order to be consistent with other delivery systems, the first + value at <link linkend="dtv-stats"><constant>dtv_property.stat.dtv_stats</constant></link> + array refers to the global metric. The other elements of the array + represent each layer, starting from layer A(index 1), + layer B (index 2) and so on.</para> + <para>The number of filled elements are stored at <constant>dtv_property.stat.len</constant>.</para> + <para>Each element of the <constant>dtv_property.stat.dtv_stats</constant> array consists on two elements:</para> + <itemizedlist mark='opencircle'> + <listitem><para><constant>svalue</constant> or <constant>uvalue</constant>, where + <constant>svalue</constant> is for signed values of the measure (dB measures) + and <constant>uvalue</constant> is for unsigned values (counters, relative scale)</para></listitem> + <listitem><para><constant>scale</constant> - Scale for the value. It can be:</para> + <itemizedlist mark='bullet' id="fecap-scale-params"> + <listitem><para><constant>FE_SCALE_NOT_AVAILABLE</constant> - The parameter is supported by the frontend, but it was not possible to collect it (could be a transitory or permanent condition)</para></listitem> + <listitem><para><constant>FE_SCALE_DECIBEL</constant> - parameter is a signed value, measured in 1/1000 dB</para></listitem> + <listitem><para><constant>FE_SCALE_RELATIVE</constant> - parameter is a unsigned value, where 0 means 0% and 65535 means 100%.</para></listitem> + <listitem><para><constant>FE_SCALE_COUNTER</constant> - parameter is a unsigned value that counts the occurrence of an event, like bit error, block error, or lapsed time.</para></listitem> + </itemizedlist> + </listitem> + </itemizedlist> + <section id="DTV-STAT-SIGNAL-STRENGTH"> + <title><constant>DTV_STAT_SIGNAL_STRENGTH</constant></title> + <para>Indicates the signal strength level at the analog part of the tuner or of the demod.</para> + <para>Possible scales for this metric are:</para> + <itemizedlist mark='bullet'> + <listitem><para><constant>FE_SCALE_NOT_AVAILABLE</constant> - it failed to measure it, or the measurement was not complete yet.</para></listitem> + <listitem><para><constant>FE_SCALE_DECIBEL</constant> - signal strength is in 0.0001 dBm units, power measured in miliwatts. This value is generally negative.</para></listitem> + <listitem><para><constant>FE_SCALE_RELATIVE</constant> - The frontend provides a 0% to 100% measurement for power (actually, 0 to 65535).</para></listitem> + </itemizedlist> + </section> + <section id="DTV-STAT-CNR"> + <title><constant>DTV_STAT_CNR</constant></title> + <para>Indicates the Signal to Noise ratio for the main carrier.</para> + <para>Possible scales for this metric are:</para> + <itemizedlist mark='bullet'> + <listitem><para><constant>FE_SCALE_NOT_AVAILABLE</constant> - it failed to measure it, or the measurement was not complete yet.</para></listitem> + <listitem><para><constant>FE_SCALE_DECIBEL</constant> - Signal/Noise ratio is in 0.0001 dB units.</para></listitem> + <listitem><para><constant>FE_SCALE_RELATIVE</constant> - The frontend provides a 0% to 100% measurement for Signal/Noise (actually, 0 to 65535).</para></listitem> + </itemizedlist> + </section> + <section id="DTV-STAT-PRE-ERROR-BIT-COUNT"> + <title><constant>DTV_STAT_PRE_ERROR_BIT_COUNT</constant></title> + <para>Measures the number of bit errors before the forward error correction (FEC) on the inner coding block (before Viterbi, LDPC or other inner code).</para> + <para>This measure is taken during the same interval as <constant>DTV_STAT_PRE_TOTAL_BIT_COUNT</constant>.</para> + <para>In order to get the BER (Bit Error Rate) measurement, it should be divided by + <link linkend="DTV-STAT-PRE-TOTAL-BIT-COUNT"><constant>DTV_STAT_PRE_TOTAL_BIT_COUNT</constant></link>.</para> + <para>This measurement is monotonically increased, as the frontend gets more bit count measurements. + The frontend may reset it when a channel/transponder is tuned.</para> + <para>Possible scales for this metric are:</para> + <itemizedlist mark='bullet'> + <listitem><para><constant>FE_SCALE_NOT_AVAILABLE</constant> - it failed to measure it, or the measurement was not complete yet.</para></listitem> + <listitem><para><constant>FE_SCALE_COUNTER</constant> - Number of error bits counted before the inner coding.</para></listitem> + </itemizedlist> + </section> + <section id="DTV-STAT-PRE-TOTAL-BIT-COUNT"> + <title><constant>DTV_STAT_PRE_TOTAL_BIT_COUNT</constant></title> + <para>Measures the amount of bits received before the inner code block, during the same period as + <link linkend="DTV-STAT-PRE-ERROR-BIT-COUNT"><constant>DTV_STAT_PRE_ERROR_BIT_COUNT</constant></link> measurement was taken.</para> + <para>It should be noticed that this measurement can be smaller than the total amount of bits on the transport stream, + as the frontend may need to manually restart the measurement, losing some data between each measurement interval.</para> + <para>This measurement is monotonically increased, as the frontend gets more bit count measurements. + The frontend may reset it when a channel/transponder is tuned.</para> + <para>Possible scales for this metric are:</para> + <itemizedlist mark='bullet'> + <listitem><para><constant>FE_SCALE_NOT_AVAILABLE</constant> - it failed to measure it, or the measurement was not complete yet.</para></listitem> + <listitem><para><constant>FE_SCALE_COUNTER</constant> - Number of bits counted while measuring + <link linkend="DTV-STAT-PRE-ERROR-BIT-COUNT"><constant>DTV_STAT_PRE_ERROR_BIT_COUNT</constant></link>.</para></listitem> + </itemizedlist> + </section> + <section id="DTV-STAT-POST-ERROR-BIT-COUNT"> + <title><constant>DTV_STAT_POST_ERROR_BIT_COUNT</constant></title> + <para>Measures the number of bit errors after the forward error correction (FEC) done by inner code block (after Viterbi, LDPC or other inner code).</para> + <para>This measure is taken during the same interval as <constant>DTV_STAT_POST_TOTAL_BIT_COUNT</constant>.</para> + <para>In order to get the BER (Bit Error Rate) measurement, it should be divided by + <link linkend="DTV-STAT-POST-TOTAL-BIT-COUNT"><constant>DTV_STAT_POST_TOTAL_BIT_COUNT</constant></link>.</para> + <para>This measurement is monotonically increased, as the frontend gets more bit count measurements. + The frontend may reset it when a channel/transponder is tuned.</para> + <para>Possible scales for this metric are:</para> + <itemizedlist mark='bullet'> + <listitem><para><constant>FE_SCALE_NOT_AVAILABLE</constant> - it failed to measure it, or the measurement was not complete yet.</para></listitem> + <listitem><para><constant>FE_SCALE_COUNTER</constant> - Number of error bits counted after the inner coding.</para></listitem> + </itemizedlist> + </section> + <section id="DTV-STAT-POST-TOTAL-BIT-COUNT"> + <title><constant>DTV_STAT_POST_TOTAL_BIT_COUNT</constant></title> + <para>Measures the amount of bits received after the inner coding, during the same period as + <link linkend="DTV-STAT-POST-ERROR-BIT-COUNT"><constant>DTV_STAT_POST_ERROR_BIT_COUNT</constant></link> measurement was taken.</para> + <para>It should be noticed that this measurement can be smaller than the total amount of bits on the transport stream, + as the frontend may need to manually restart the measurement, losing some data between each measurement interval.</para> + <para>This measurement is monotonically increased, as the frontend gets more bit count measurements. + The frontend may reset it when a channel/transponder is tuned.</para> + <para>Possible scales for this metric are:</para> + <itemizedlist mark='bullet'> + <listitem><para><constant>FE_SCALE_NOT_AVAILABLE</constant> - it failed to measure it, or the measurement was not complete yet.</para></listitem> + <listitem><para><constant>FE_SCALE_COUNTER</constant> - Number of bits counted while measuring + <link linkend="DTV-STAT-POST-ERROR-BIT-COUNT"><constant>DTV_STAT_POST_ERROR_BIT_COUNT</constant></link>.</para></listitem> + </itemizedlist> + </section> + <section id="DTV-STAT-ERROR-BLOCK-COUNT"> + <title><constant>DTV_STAT_ERROR_BLOCK_COUNT</constant></title> + <para>Measures the number of block errors after the outer forward error correction coding (after Reed-Solomon or other outer code).</para> + <para>This measurement is monotonically increased, as the frontend gets more bit count measurements. + The frontend may reset it when a channel/transponder is tuned.</para> + <para>Possible scales for this metric are:</para> + <itemizedlist mark='bullet'> + <listitem><para><constant>FE_SCALE_NOT_AVAILABLE</constant> - it failed to measure it, or the measurement was not complete yet.</para></listitem> + <listitem><para><constant>FE_SCALE_COUNTER</constant> - Number of error blocks counted after the outer coding.</para></listitem> + </itemizedlist> + </section> + <section id="DTV-STAT-TOTAL-BLOCK-COUNT"> + <title><constant>DTV-STAT_TOTAL_BLOCK_COUNT</constant></title> + <para>Measures the total number of blocks received during the same period as + <link linkend="DTV-STAT-ERROR-BLOCK-COUNT"><constant>DTV_STAT_ERROR_BLOCK_COUNT</constant></link> measurement was taken.</para> + <para>It can be used to calculate the PER indicator, by dividing + <link linkend="DTV-STAT-ERROR-BLOCK-COUNT"><constant>DTV_STAT_ERROR_BLOCK_COUNT</constant></link> + by <link linkend="DTV-STAT-TOTAL-BLOCK-COUNT"><constant>DTV-STAT-TOTAL-BLOCK-COUNT</constant></link>.</para> + <para>Possible scales for this metric are:</para> + <itemizedlist mark='bullet'> + <listitem><para><constant>FE_SCALE_NOT_AVAILABLE</constant> - it failed to measure it, or the measurement was not complete yet.</para></listitem> + <listitem><para><constant>FE_SCALE_COUNTER</constant> - Number of blocks counted while measuring + <link linkend="DTV-STAT-ERROR-BLOCK-COUNT"><constant>DTV_STAT_ERROR_BLOCK_COUNT</constant></link>.</para></listitem> + </itemizedlist> + </section> + </section> + + <section id="frontend-property-terrestrial-systems"> + <title>Properties used on terrestrial delivery systems</title> + <section id="dvbt-params"> + <title>DVB-T delivery system</title> + <para>The following parameters are valid for DVB-T:</para> + <itemizedlist mark='opencircle'> + <listitem><para><link linkend="DTV-API-VERSION"><constant>DTV_API_VERSION</constant></link></para></listitem> + <listitem><para><link linkend="DTV-DELIVERY-SYSTEM"><constant>DTV_DELIVERY_SYSTEM</constant></link></para></listitem> + <listitem><para><link linkend="DTV-TUNE"><constant>DTV_TUNE</constant></link></para></listitem> + <listitem><para><link linkend="DTV-CLEAR"><constant>DTV_CLEAR</constant></link></para></listitem> + <listitem><para><link linkend="DTV-FREQUENCY"><constant>DTV_FREQUENCY</constant></link></para></listitem> + <listitem><para><link linkend="DTV-MODULATION"><constant>DTV_MODULATION</constant></link></para></listitem> + <listitem><para><link linkend="DTV-BANDWIDTH-HZ"><constant>DTV_BANDWIDTH_HZ</constant></link></para></listitem> + <listitem><para><link linkend="DTV-INVERSION"><constant>DTV_INVERSION</constant></link></para></listitem> + <listitem><para><link linkend="DTV-CODE-RATE-HP"><constant>DTV_CODE_RATE_HP</constant></link></para></listitem> + <listitem><para><link linkend="DTV-CODE-RATE-LP"><constant>DTV_CODE_RATE_LP</constant></link></para></listitem> + <listitem><para><link linkend="DTV-GUARD-INTERVAL"><constant>DTV_GUARD_INTERVAL</constant></link></para></listitem> + <listitem><para><link linkend="DTV-TRANSMISSION-MODE"><constant>DTV_TRANSMISSION_MODE</constant></link></para></listitem> + <listitem><para><link linkend="DTV-HIERARCHY"><constant>DTV_HIERARCHY</constant></link></para></listitem> + <listitem><para><link linkend="DTV-LNA"><constant>DTV_LNA</constant></link></para></listitem> + </itemizedlist> + <para>In addition, the <link linkend="frontend-stat-properties">DTV QoS statistics</link> are also valid.</para> + </section> + <section id="dvbt2-params"> + <title>DVB-T2 delivery system</title> + <para>DVB-T2 support is currently in the early stages + of development, so expect that this section maygrow and become + more detailed with time.</para> + <para>The following parameters are valid for DVB-T2:</para> + <itemizedlist mark='opencircle'> + <listitem><para><link linkend="DTV-API-VERSION"><constant>DTV_API_VERSION</constant></link></para></listitem> + <listitem><para><link linkend="DTV-DELIVERY-SYSTEM"><constant>DTV_DELIVERY_SYSTEM</constant></link></para></listitem> + <listitem><para><link linkend="DTV-TUNE"><constant>DTV_TUNE</constant></link></para></listitem> + <listitem><para><link linkend="DTV-CLEAR"><constant>DTV_CLEAR</constant></link></para></listitem> + <listitem><para><link linkend="DTV-FREQUENCY"><constant>DTV_FREQUENCY</constant></link></para></listitem> + <listitem><para><link linkend="DTV-MODULATION"><constant>DTV_MODULATION</constant></link></para></listitem> + <listitem><para><link linkend="DTV-BANDWIDTH-HZ"><constant>DTV_BANDWIDTH_HZ</constant></link></para></listitem> + <listitem><para><link linkend="DTV-INVERSION"><constant>DTV_INVERSION</constant></link></para></listitem> + <listitem><para><link linkend="DTV-CODE-RATE-HP"><constant>DTV_CODE_RATE_HP</constant></link></para></listitem> + <listitem><para><link linkend="DTV-CODE-RATE-LP"><constant>DTV_CODE_RATE_LP</constant></link></para></listitem> + <listitem><para><link linkend="DTV-GUARD-INTERVAL"><constant>DTV_GUARD_INTERVAL</constant></link></para></listitem> + <listitem><para><link linkend="DTV-TRANSMISSION-MODE"><constant>DTV_TRANSMISSION_MODE</constant></link></para></listitem> + <listitem><para><link linkend="DTV-HIERARCHY"><constant>DTV_HIERARCHY</constant></link></para></listitem> + <listitem><para><link linkend="DTV-STREAM-ID"><constant>DTV_STREAM_ID</constant></link></para></listitem> + <listitem><para><link linkend="DTV-LNA"><constant>DTV_LNA</constant></link></para></listitem> + </itemizedlist> + <para>In addition, the <link linkend="frontend-stat-properties">DTV QoS statistics</link> are also valid.</para> + </section> + <section id="isdbt"> + <title>ISDB-T delivery system</title> + <para>This ISDB-T/ISDB-Tsb API extension should reflect all information + needed to tune any ISDB-T/ISDB-Tsb hardware. Of course it is possible + that some very sophisticated devices won't need certain parameters to + tune.</para> + <para>The information given here should help application writers to know how + to handle ISDB-T and ISDB-Tsb hardware using the Linux DVB-API.</para> + <para>The details given here about ISDB-T and ISDB-Tsb are just enough to + basically show the dependencies between the needed parameter values, + but surely some information is left out. For more detailed information + see the following documents:</para> + <para>ARIB STD-B31 - "Transmission System for Digital Terrestrial + Television Broadcasting" and</para> + <para>ARIB TR-B14 - "Operational Guidelines for Digital Terrestrial + Television Broadcasting".</para> + <para>In order to understand the ISDB specific parameters, + one has to have some knowledge the channel structure in + ISDB-T and ISDB-Tsb. I.e. it has to be known to + the reader that an ISDB-T channel consists of 13 segments, + that it can have up to 3 layer sharing those segments, + and things like that.</para> + <para>The following parameters are valid for ISDB-T:</para> + <itemizedlist mark='opencircle'> + <listitem><para><link linkend="DTV-API-VERSION"><constant>DTV_API_VERSION</constant></link></para></listitem> + <listitem><para><link linkend="DTV-DELIVERY-SYSTEM"><constant>DTV_DELIVERY_SYSTEM</constant></link></para></listitem> + <listitem><para><link linkend="DTV-TUNE"><constant>DTV_TUNE</constant></link></para></listitem> + <listitem><para><link linkend="DTV-CLEAR"><constant>DTV_CLEAR</constant></link></para></listitem> + <listitem><para><link linkend="DTV-FREQUENCY"><constant>DTV_FREQUENCY</constant></link></para></listitem> + <listitem><para><link linkend="DTV-BANDWIDTH-HZ"><constant>DTV_BANDWIDTH_HZ</constant></link></para></listitem> + <listitem><para><link linkend="DTV-INVERSION"><constant>DTV_INVERSION</constant></link></para></listitem> + <listitem><para><link linkend="DTV-GUARD-INTERVAL"><constant>DTV_GUARD_INTERVAL</constant></link></para></listitem> + <listitem><para><link linkend="DTV-TRANSMISSION-MODE"><constant>DTV_TRANSMISSION_MODE</constant></link></para></listitem> + <listitem><para><link linkend="DTV-ISDBT-LAYER-ENABLED"><constant>DTV_ISDBT_LAYER_ENABLED</constant></link></para></listitem> + <listitem><para><link linkend="DTV-ISDBT-PARTIAL-RECEPTION"><constant>DTV_ISDBT_PARTIAL_RECEPTION</constant></link></para></listitem> + <listitem><para><link linkend="DTV-ISDBT-SOUND-BROADCASTING"><constant>DTV_ISDBT_SOUND_BROADCASTING</constant></link></para></listitem> + <listitem><para><link linkend="DTV-ISDBT-SB-SUBCHANNEL-ID"><constant>DTV_ISDBT_SB_SUBCHANNEL_ID</constant></link></para></listitem> + <listitem><para><link linkend="DTV-ISDBT-SB-SEGMENT-IDX"><constant>DTV_ISDBT_SB_SEGMENT_IDX</constant></link></para></listitem> + <listitem><para><link linkend="DTV-ISDBT-SB-SEGMENT-COUNT"><constant>DTV_ISDBT_SB_SEGMENT_COUNT</constant></link></para></listitem> + <listitem><para><link linkend="DTV-ISDBT-LAYER-FEC"><constant>DTV_ISDBT_LAYERA_FEC</constant></link></para></listitem> + <listitem><para><link linkend="DTV-ISDBT-LAYER-MODULATION"><constant>DTV_ISDBT_LAYERA_MODULATION</constant></link></para></listitem> + <listitem><para><link linkend="DTV-ISDBT-LAYER-SEGMENT-COUNT"><constant>DTV_ISDBT_LAYERA_SEGMENT_COUNT</constant></link></para></listitem> + <listitem><para><link linkend="DTV-ISDBT-LAYER-TIME-INTERLEAVING"><constant>DTV_ISDBT_LAYERA_TIME_INTERLEAVING</constant></link></para></listitem> + <listitem><para><link linkend="DTV-ISDBT-LAYER-FEC"><constant>DTV_ISDBT_LAYERB_FEC</constant></link></para></listitem> + <listitem><para><link linkend="DTV-ISDBT-LAYER-MODULATION"><constant>DTV_ISDBT_LAYERB_MODULATION</constant></link></para></listitem> + <listitem><para><link linkend="DTV-ISDBT-LAYER-SEGMENT-COUNT"><constant>DTV_ISDBT_LAYERB_SEGMENT_COUNT</constant></link></para></listitem> + <listitem><para><link linkend="DTV-ISDBT-LAYER-TIME-INTERLEAVING"><constant>DTV_ISDBT_LAYERB_TIME_INTERLEAVING</constant></link></para></listitem> + <listitem><para><link linkend="DTV-ISDBT-LAYER-FEC"><constant>DTV_ISDBT_LAYERC_FEC</constant></link></para></listitem> + <listitem><para><link linkend="DTV-ISDBT-LAYER-MODULATION"><constant>DTV_ISDBT_LAYERC_MODULATION</constant></link></para></listitem> + <listitem><para><link linkend="DTV-ISDBT-LAYER-SEGMENT-COUNT"><constant>DTV_ISDBT_LAYERC_SEGMENT_COUNT</constant></link></para></listitem> + <listitem><para><link linkend="DTV-ISDBT-LAYER-TIME-INTERLEAVING"><constant>DTV_ISDBT_LAYERC_TIME_INTERLEAVING</constant></link></para></listitem> + </itemizedlist> + <para>In addition, the <link linkend="frontend-stat-properties">DTV QoS statistics</link> are also valid.</para> + </section> + <section id="atsc-params"> + <title>ATSC delivery system</title> + <para>The following parameters are valid for ATSC:</para> + <itemizedlist mark='opencircle'> + <listitem><para><link linkend="DTV-API-VERSION"><constant>DTV_API_VERSION</constant></link></para></listitem> + <listitem><para><link linkend="DTV-DELIVERY-SYSTEM"><constant>DTV_DELIVERY_SYSTEM</constant></link></para></listitem> + <listitem><para><link linkend="DTV-TUNE"><constant>DTV_TUNE</constant></link></para></listitem> + <listitem><para><link linkend="DTV-CLEAR"><constant>DTV_CLEAR</constant></link></para></listitem> + <listitem><para><link linkend="DTV-FREQUENCY"><constant>DTV_FREQUENCY</constant></link></para></listitem> + <listitem><para><link linkend="DTV-MODULATION"><constant>DTV_MODULATION</constant></link></para></listitem> + <listitem><para><link linkend="DTV-BANDWIDTH-HZ"><constant>DTV_BANDWIDTH_HZ</constant></link></para></listitem> + </itemizedlist> + <para>In addition, the <link linkend="frontend-stat-properties">DTV QoS statistics</link> are also valid.</para> + </section> + <section id="atscmh-params"> + <title>ATSC-MH delivery system</title> + <para>The following parameters are valid for ATSC-MH:</para> + <itemizedlist mark='opencircle'> + <listitem><para><link linkend="DTV-API-VERSION"><constant>DTV_API_VERSION</constant></link></para></listitem> + <listitem><para><link linkend="DTV-DELIVERY-SYSTEM"><constant>DTV_DELIVERY_SYSTEM</constant></link></para></listitem> + <listitem><para><link linkend="DTV-TUNE"><constant>DTV_TUNE</constant></link></para></listitem> + <listitem><para><link linkend="DTV-CLEAR"><constant>DTV_CLEAR</constant></link></para></listitem> + <listitem><para><link linkend="DTV-FREQUENCY"><constant>DTV_FREQUENCY</constant></link></para></listitem> + <listitem><para><link linkend="DTV-BANDWIDTH-HZ"><constant>DTV_BANDWIDTH_HZ</constant></link></para></listitem> + <listitem><para><link linkend="DTV-ATSCMH-FIC-VER"><constant>DTV_ATSCMH_FIC_VER</constant></link></para></listitem> + <listitem><para><link linkend="DTV-ATSCMH-PARADE-ID"><constant>DTV_ATSCMH_PARADE_ID</constant></link></para></listitem> + <listitem><para><link linkend="DTV-ATSCMH-NOG"><constant>DTV_ATSCMH_NOG</constant></link></para></listitem> + <listitem><para><link linkend="DTV-ATSCMH-TNOG"><constant>DTV_ATSCMH_TNOG</constant></link></para></listitem> + <listitem><para><link linkend="DTV-ATSCMH-SGN"><constant>DTV_ATSCMH_SGN</constant></link></para></listitem> + <listitem><para><link linkend="DTV-ATSCMH-PRC"><constant>DTV_ATSCMH_PRC</constant></link></para></listitem> + <listitem><para><link linkend="DTV-ATSCMH-RS-FRAME-MODE"><constant>DTV_ATSCMH_RS_FRAME_MODE</constant></link></para></listitem> + <listitem><para><link linkend="DTV-ATSCMH-RS-FRAME-ENSEMBLE"><constant>DTV_ATSCMH_RS_FRAME_ENSEMBLE</constant></link></para></listitem> + <listitem><para><link linkend="DTV-ATSCMH-RS-CODE-MODE-PRI"><constant>DTV_ATSCMH_RS_CODE_MODE_PRI</constant></link></para></listitem> + <listitem><para><link linkend="DTV-ATSCMH-RS-CODE-MODE-SEC"><constant>DTV_ATSCMH_RS_CODE_MODE_SEC</constant></link></para></listitem> + <listitem><para><link linkend="DTV-ATSCMH-SCCC-BLOCK-MODE"><constant>DTV_ATSCMH_SCCC_BLOCK_MODE</constant></link></para></listitem> + <listitem><para><link linkend="DTV-ATSCMH-SCCC-CODE-MODE-A"><constant>DTV_ATSCMH_SCCC_CODE_MODE_A</constant></link></para></listitem> + <listitem><para><link linkend="DTV-ATSCMH-SCCC-CODE-MODE-B"><constant>DTV_ATSCMH_SCCC_CODE_MODE_B</constant></link></para></listitem> + <listitem><para><link linkend="DTV-ATSCMH-SCCC-CODE-MODE-C"><constant>DTV_ATSCMH_SCCC_CODE_MODE_C</constant></link></para></listitem> + <listitem><para><link linkend="DTV-ATSCMH-SCCC-CODE-MODE-D"><constant>DTV_ATSCMH_SCCC_CODE_MODE_D</constant></link></para></listitem> + </itemizedlist> + <para>In addition, the <link linkend="frontend-stat-properties">DTV QoS statistics</link> are also valid.</para> + </section> + <section id="dtmb-params"> + <title>DTMB delivery system</title> + <para>The following parameters are valid for DTMB:</para> + <itemizedlist mark='opencircle'> + <listitem><para><link linkend="DTV-API-VERSION"><constant>DTV_API_VERSION</constant></link></para></listitem> + <listitem><para><link linkend="DTV-DELIVERY-SYSTEM"><constant>DTV_DELIVERY_SYSTEM</constant></link></para></listitem> + <listitem><para><link linkend="DTV-TUNE"><constant>DTV_TUNE</constant></link></para></listitem> + <listitem><para><link linkend="DTV-CLEAR"><constant>DTV_CLEAR</constant></link></para></listitem> + <listitem><para><link linkend="DTV-FREQUENCY"><constant>DTV_FREQUENCY</constant></link></para></listitem> + <listitem><para><link linkend="DTV-MODULATION"><constant>DTV_MODULATION</constant></link></para></listitem> + <listitem><para><link linkend="DTV-BANDWIDTH-HZ"><constant>DTV_BANDWIDTH_HZ</constant></link></para></listitem> + <listitem><para><link linkend="DTV-INVERSION"><constant>DTV_INVERSION</constant></link></para></listitem> + <listitem><para><link linkend="DTV-INNER-FEC"><constant>DTV_INNER_FEC</constant></link></para></listitem> + <listitem><para><link linkend="DTV-GUARD-INTERVAL"><constant>DTV_GUARD_INTERVAL</constant></link></para></listitem> + <listitem><para><link linkend="DTV-TRANSMISSION-MODE"><constant>DTV_TRANSMISSION_MODE</constant></link></para></listitem> + <listitem><para><link linkend="DTV-INTERLEAVING"><constant>DTV_INTERLEAVING</constant></link></para></listitem> + <listitem><para><link linkend="DTV-LNA"><constant>DTV_LNA</constant></link></para></listitem> + </itemizedlist> + <para>In addition, the <link linkend="frontend-stat-properties">DTV QoS statistics</link> are also valid.</para> + </section> + </section> + <section id="frontend-property-cable-systems"> + <title>Properties used on cable delivery systems</title> + <section id="dvbc-params"> + <title>DVB-C delivery system</title> + <para>The DVB-C Annex-A is the widely used cable standard. Transmission uses QAM modulation.</para> + <para>The DVB-C Annex-C is optimized for 6MHz, and is used in Japan. It supports a subset of the Annex A modulation types, and a roll-off of 0.13, instead of 0.15</para> + <para>The following parameters are valid for DVB-C Annex A/C:</para> + <itemizedlist mark='opencircle'> + <listitem><para><link linkend="DTV-API-VERSION"><constant>DTV_API_VERSION</constant></link></para></listitem> + <listitem><para><link linkend="DTV-DELIVERY-SYSTEM"><constant>DTV_DELIVERY_SYSTEM</constant></link></para></listitem> + <listitem><para><link linkend="DTV-TUNE"><constant>DTV_TUNE</constant></link></para></listitem> + <listitem><para><link linkend="DTV-CLEAR"><constant>DTV_CLEAR</constant></link></para></listitem> + <listitem><para><link linkend="DTV-FREQUENCY"><constant>DTV_FREQUENCY</constant></link></para></listitem> + <listitem><para><link linkend="DTV-MODULATION"><constant>DTV_MODULATION</constant></link></para></listitem> + <listitem><para><link linkend="DTV-INVERSION"><constant>DTV_INVERSION</constant></link></para></listitem> + <listitem><para><link linkend="DTV-SYMBOL-RATE"><constant>DTV_SYMBOL_RATE</constant></link></para></listitem> + <listitem><para><link linkend="DTV-INNER-FEC"><constant>DTV_INNER_FEC</constant></link></para></listitem> + <listitem><para><link linkend="DTV-LNA"><constant>DTV_LNA</constant></link></para></listitem> + </itemizedlist> + <para>In addition, the <link linkend="frontend-stat-properties">DTV QoS statistics</link> are also valid.</para> + </section> + <section id="dvbc-annex-b-params"> + <title>DVB-C Annex B delivery system</title> + <para>The DVB-C Annex-B is only used on a few Countries like the United States.</para> + <para>The following parameters are valid for DVB-C Annex B:</para> + <itemizedlist mark='opencircle'> + <listitem><para><link linkend="DTV-API-VERSION"><constant>DTV_API_VERSION</constant></link></para></listitem> + <listitem><para><link linkend="DTV-DELIVERY-SYSTEM"><constant>DTV_DELIVERY_SYSTEM</constant></link></para></listitem> + <listitem><para><link linkend="DTV-TUNE"><constant>DTV_TUNE</constant></link></para></listitem> + <listitem><para><link linkend="DTV-CLEAR"><constant>DTV_CLEAR</constant></link></para></listitem> + <listitem><para><link linkend="DTV-FREQUENCY"><constant>DTV_FREQUENCY</constant></link></para></listitem> + <listitem><para><link linkend="DTV-MODULATION"><constant>DTV_MODULATION</constant></link></para></listitem> + <listitem><para><link linkend="DTV-INVERSION"><constant>DTV_INVERSION</constant></link></para></listitem> + <listitem><para><link linkend="DTV-LNA"><constant>DTV_LNA</constant></link></para></listitem> + </itemizedlist> + <para>In addition, the <link linkend="frontend-stat-properties">DTV QoS statistics</link> are also valid.</para> + </section> + </section> + <section id="frontend-property-satellital-systems"> + <title>Properties used on satellital delivery systems</title> + <section id="dvbs-params"> + <title>DVB-S delivery system</title> + <para>The following parameters are valid for DVB-S:</para> + <itemizedlist mark='opencircle'> + <listitem><para><link linkend="DTV-API-VERSION"><constant>DTV_API_VERSION</constant></link></para></listitem> + <listitem><para><link linkend="DTV-DELIVERY-SYSTEM"><constant>DTV_DELIVERY_SYSTEM</constant></link></para></listitem> + <listitem><para><link linkend="DTV-TUNE"><constant>DTV_TUNE</constant></link></para></listitem> + <listitem><para><link linkend="DTV-CLEAR"><constant>DTV_CLEAR</constant></link></para></listitem> + <listitem><para><link linkend="DTV-FREQUENCY"><constant>DTV_FREQUENCY</constant></link></para></listitem> + <listitem><para><link linkend="DTV-INVERSION"><constant>DTV_INVERSION</constant></link></para></listitem> + <listitem><para><link linkend="DTV-SYMBOL-RATE"><constant>DTV_SYMBOL_RATE</constant></link></para></listitem> + <listitem><para><link linkend="DTV-INNER-FEC"><constant>DTV_INNER_FEC</constant></link></para></listitem> + <listitem><para><link linkend="DTV-VOLTAGE"><constant>DTV_VOLTAGE</constant></link></para></listitem> + <listitem><para><link linkend="DTV-TONE"><constant>DTV_TONE</constant></link></para></listitem> + </itemizedlist> + <para>In addition, the <link linkend="frontend-stat-properties">DTV QoS statistics</link> are also valid.</para> + <para>Future implementations might add those two missing parameters:</para> + <itemizedlist mark='opencircle'> + <listitem><para><link linkend="DTV-DISEQC-MASTER"><constant>DTV_DISEQC_MASTER</constant></link></para></listitem> + <listitem><para><link linkend="DTV-DISEQC-SLAVE-REPLY"><constant>DTV_DISEQC_SLAVE_REPLY</constant></link></para></listitem> + </itemizedlist> + </section> + <section id="dvbs2-params"> + <title>DVB-S2 delivery system</title> + <para>In addition to all parameters valid for DVB-S, DVB-S2 supports the following parameters:</para> + <itemizedlist mark='opencircle'> + <listitem><para><link linkend="DTV-MODULATION"><constant>DTV_MODULATION</constant></link></para></listitem> + <listitem><para><link linkend="DTV-PILOT"><constant>DTV_PILOT</constant></link></para></listitem> + <listitem><para><link linkend="DTV-ROLLOFF"><constant>DTV_ROLLOFF</constant></link></para></listitem> + <listitem><para><link linkend="DTV-STREAM-ID"><constant>DTV_STREAM_ID</constant></link></para></listitem> + </itemizedlist> + <para>In addition, the <link linkend="frontend-stat-properties">DTV QoS statistics</link> are also valid.</para> + </section> + <section id="turbo-params"> + <title>Turbo code delivery system</title> + <para>In addition to all parameters valid for DVB-S, turbo code supports the following parameters:</para> + <itemizedlist mark='opencircle'> + <listitem><para><link linkend="DTV-MODULATION"><constant>DTV_MODULATION</constant></link></para></listitem> + </itemizedlist> + </section> + <section id="isdbs-params"> + <title>ISDB-S delivery system</title> + <para>The following parameters are valid for ISDB-S:</para> + <itemizedlist mark='opencircle'> + <listitem><para><link linkend="DTV-API-VERSION"><constant>DTV_API_VERSION</constant></link></para></listitem> + <listitem><para><link linkend="DTV-DELIVERY-SYSTEM"><constant>DTV_DELIVERY_SYSTEM</constant></link></para></listitem> + <listitem><para><link linkend="DTV-TUNE"><constant>DTV_TUNE</constant></link></para></listitem> + <listitem><para><link linkend="DTV-CLEAR"><constant>DTV_CLEAR</constant></link></para></listitem> + <listitem><para><link linkend="DTV-FREQUENCY"><constant>DTV_FREQUENCY</constant></link></para></listitem> + <listitem><para><link linkend="DTV-INVERSION"><constant>DTV_INVERSION</constant></link></para></listitem> + <listitem><para><link linkend="DTV-SYMBOL-RATE"><constant>DTV_SYMBOL_RATE</constant></link></para></listitem> + <listitem><para><link linkend="DTV-INNER-FEC"><constant>DTV_INNER_FEC</constant></link></para></listitem> + <listitem><para><link linkend="DTV-VOLTAGE"><constant>DTV_VOLTAGE</constant></link></para></listitem> + <listitem><para><link linkend="DTV-STREAM-ID"><constant>DTV_STREAM_ID</constant></link></para></listitem> + </itemizedlist> + </section> + </section> +</section> diff --git a/Documentation/DocBook/media/dvb/dvbstb.pdf b/Documentation/DocBook/media/dvb/dvbstb.pdf Binary files differnew file mode 100644 index 00000000000..0fa75d90c3e --- /dev/null +++ b/Documentation/DocBook/media/dvb/dvbstb.pdf diff --git a/Documentation/DocBook/media/dvb/examples.xml b/Documentation/DocBook/media/dvb/examples.xml new file mode 100644 index 00000000000..f037e568eb6 --- /dev/null +++ b/Documentation/DocBook/media/dvb/examples.xml @@ -0,0 +1,365 @@ +<title>Examples</title> +<para>In this section we would like to present some examples for using the DVB API. +</para> +<para>Maintainer note: This section is out of date. Please refer to the sample programs packaged +with the driver distribution from <ulink url="http://linuxtv.org/hg/dvb-apps" />. +</para> + +<section id="tuning"> +<title>Tuning</title> +<para>We will start with a generic tuning subroutine that uses the frontend and SEC, as well as +the demux devices. The example is given for QPSK tuners, but can easily be adjusted for +QAM. +</para> +<programlisting> + #include <sys/ioctl.h> + #include <stdio.h> + #include <stdint.h> + #include <sys/types.h> + #include <sys/stat.h> + #include <fcntl.h> + #include <time.h> + #include <unistd.h> + + #include <linux/dvb/dmx.h> + #include <linux/dvb/frontend.h> + #include <linux/dvb/sec.h> + #include <sys/poll.h> + + #define DMX "/dev/dvb/adapter0/demux1" + #define FRONT "/dev/dvb/adapter0/frontend1" + #define SEC "/dev/dvb/adapter0/sec1" + + /⋆ routine for checking if we have a signal and other status information⋆/ + int FEReadStatus(int fd, fe_status_t ⋆stat) + { + int ans; + + if ( (ans = ioctl(fd,FE_READ_STATUS,stat) < 0)){ + perror("FE READ STATUS: "); + return -1; + } + + if (⋆stat & FE_HAS_POWER) + printf("FE HAS POWER\n"); + + if (⋆stat & FE_HAS_SIGNAL) + printf("FE HAS SIGNAL\n"); + + if (⋆stat & FE_SPECTRUM_INV) + printf("SPEKTRUM INV\n"); + + return 0; + } + + + /⋆ tune qpsk ⋆/ + /⋆ freq: frequency of transponder ⋆/ + /⋆ vpid, apid, tpid: PIDs of video, audio and teletext TS packets ⋆/ + /⋆ diseqc: DiSEqC address of the used LNB ⋆/ + /⋆ pol: Polarisation ⋆/ + /⋆ srate: Symbol Rate ⋆/ + /⋆ fec. FEC ⋆/ + /⋆ lnb_lof1: local frequency of lower LNB band ⋆/ + /⋆ lnb_lof2: local frequency of upper LNB band ⋆/ + /⋆ lnb_slof: switch frequency of LNB ⋆/ + + int set_qpsk_channel(int freq, int vpid, int apid, int tpid, + int diseqc, int pol, int srate, int fec, int lnb_lof1, + int lnb_lof2, int lnb_slof) + { + struct secCommand scmd; + struct secCmdSequence scmds; + struct dmx_pes_filter_params pesFilterParams; + FrontendParameters frp; + struct pollfd pfd[1]; + FrontendEvent event; + int demux1, demux2, demux3, front; + + frequency = (uint32_t) freq; + symbolrate = (uint32_t) srate; + + if((front = open(FRONT,O_RDWR)) < 0){ + perror("FRONTEND DEVICE: "); + return -1; + } + + if((sec = open(SEC,O_RDWR)) < 0){ + perror("SEC DEVICE: "); + return -1; + } + + if (demux1 < 0){ + if ((demux1=open(DMX, O_RDWR|O_NONBLOCK)) + < 0){ + perror("DEMUX DEVICE: "); + return -1; + } + } + + if (demux2 < 0){ + if ((demux2=open(DMX, O_RDWR|O_NONBLOCK)) + < 0){ + perror("DEMUX DEVICE: "); + return -1; + } + } + + if (demux3 < 0){ + if ((demux3=open(DMX, O_RDWR|O_NONBLOCK)) + < 0){ + perror("DEMUX DEVICE: "); + return -1; + } + } + + if (freq < lnb_slof) { + frp.Frequency = (freq - lnb_lof1); + scmds.continuousTone = SEC_TONE_OFF; + } else { + frp.Frequency = (freq - lnb_lof2); + scmds.continuousTone = SEC_TONE_ON; + } + frp.Inversion = INVERSION_AUTO; + if (pol) scmds.voltage = SEC_VOLTAGE_18; + else scmds.voltage = SEC_VOLTAGE_13; + + scmd.type=0; + scmd.u.diseqc.addr=0x10; + scmd.u.diseqc.cmd=0x38; + scmd.u.diseqc.numParams=1; + scmd.u.diseqc.params[0] = 0xF0 | ((diseqc ⋆ 4) & 0x0F) | + (scmds.continuousTone == SEC_TONE_ON ? 1 : 0) | + (scmds.voltage==SEC_VOLTAGE_18 ? 2 : 0); + + scmds.miniCommand=SEC_MINI_NONE; + scmds.numCommands=1; + scmds.commands=&scmd; + if (ioctl(sec, SEC_SEND_SEQUENCE, &scmds) < 0){ + perror("SEC SEND: "); + return -1; + } + + if (ioctl(sec, SEC_SEND_SEQUENCE, &scmds) < 0){ + perror("SEC SEND: "); + return -1; + } + + frp.u.qpsk.SymbolRate = srate; + frp.u.qpsk.FEC_inner = fec; + + if (ioctl(front, FE_SET_FRONTEND, &frp) < 0){ + perror("QPSK TUNE: "); + return -1; + } + + pfd[0].fd = front; + pfd[0].events = POLLIN; + + if (poll(pfd,1,3000)){ + if (pfd[0].revents & POLLIN){ + printf("Getting QPSK event\n"); + if ( ioctl(front, FE_GET_EVENT, &event) + + == -EOVERFLOW){ + perror("qpsk get event"); + return -1; + } + printf("Received "); + switch(event.type){ + case FE_UNEXPECTED_EV: + printf("unexpected event\n"); + return -1; + case FE_FAILURE_EV: + printf("failure event\n"); + return -1; + + case FE_COMPLETION_EV: + printf("completion event\n"); + } + } + } + + + pesFilterParams.pid = vpid; + pesFilterParams.input = DMX_IN_FRONTEND; + pesFilterParams.output = DMX_OUT_DECODER; + pesFilterParams.pes_type = DMX_PES_VIDEO; + pesFilterParams.flags = DMX_IMMEDIATE_START; + if (ioctl(demux1, DMX_SET_PES_FILTER, &pesFilterParams) < 0){ + perror("set_vpid"); + return -1; + } + + pesFilterParams.pid = apid; + pesFilterParams.input = DMX_IN_FRONTEND; + pesFilterParams.output = DMX_OUT_DECODER; + pesFilterParams.pes_type = DMX_PES_AUDIO; + pesFilterParams.flags = DMX_IMMEDIATE_START; + if (ioctl(demux2, DMX_SET_PES_FILTER, &pesFilterParams) < 0){ + perror("set_apid"); + return -1; + } + + pesFilterParams.pid = tpid; + pesFilterParams.input = DMX_IN_FRONTEND; + pesFilterParams.output = DMX_OUT_DECODER; + pesFilterParams.pes_type = DMX_PES_TELETEXT; + pesFilterParams.flags = DMX_IMMEDIATE_START; + if (ioctl(demux3, DMX_SET_PES_FILTER, &pesFilterParams) < 0){ + perror("set_tpid"); + return -1; + } + + return has_signal(fds); + } + +</programlisting> +<para>The program assumes that you are using a universal LNB and a standard DiSEqC +switch with up to 4 addresses. Of course, you could build in some more checking if +tuning was successful and maybe try to repeat the tuning process. Depending on the +external hardware, i.e. LNB and DiSEqC switch, and weather conditions this may be +necessary. +</para> +</section> + +<section id="the_dvr_device"> +<title>The DVR device</title> +<para>The following program code shows how to use the DVR device for recording. +</para> +<programlisting> + #include <sys/ioctl.h> + #include <stdio.h> + #include <stdint.h> + #include <sys/types.h> + #include <sys/stat.h> + #include <fcntl.h> + #include <time.h> + #include <unistd.h> + + #include <linux/dvb/dmx.h> + #include <linux/dvb/video.h> + #include <sys/poll.h> + #define DVR "/dev/dvb/adapter0/dvr1" + #define AUDIO "/dev/dvb/adapter0/audio1" + #define VIDEO "/dev/dvb/adapter0/video1" + + #define BUFFY (188⋆20) + #define MAX_LENGTH (1024⋆1024⋆5) /⋆ record 5MB ⋆/ + + + /⋆ switch the demuxes to recording, assuming the transponder is tuned ⋆/ + + /⋆ demux1, demux2: file descriptor of video and audio filters ⋆/ + /⋆ vpid, apid: PIDs of video and audio channels ⋆/ + + int switch_to_record(int demux1, int demux2, uint16_t vpid, uint16_t apid) + { + struct dmx_pes_filter_params pesFilterParams; + + if (demux1 < 0){ + if ((demux1=open(DMX, O_RDWR|O_NONBLOCK)) + < 0){ + perror("DEMUX DEVICE: "); + return -1; + } + } + + if (demux2 < 0){ + if ((demux2=open(DMX, O_RDWR|O_NONBLOCK)) + < 0){ + perror("DEMUX DEVICE: "); + return -1; + } + } + + pesFilterParams.pid = vpid; + pesFilterParams.input = DMX_IN_FRONTEND; + pesFilterParams.output = DMX_OUT_TS_TAP; + pesFilterParams.pes_type = DMX_PES_VIDEO; + pesFilterParams.flags = DMX_IMMEDIATE_START; + if (ioctl(demux1, DMX_SET_PES_FILTER, &pesFilterParams) < 0){ + perror("DEMUX DEVICE"); + return -1; + } + pesFilterParams.pid = apid; + pesFilterParams.input = DMX_IN_FRONTEND; + pesFilterParams.output = DMX_OUT_TS_TAP; + pesFilterParams.pes_type = DMX_PES_AUDIO; + pesFilterParams.flags = DMX_IMMEDIATE_START; + if (ioctl(demux2, DMX_SET_PES_FILTER, &pesFilterParams) < 0){ + perror("DEMUX DEVICE"); + return -1; + } + return 0; + } + + /⋆ start recording MAX_LENGTH , assuming the transponder is tuned ⋆/ + + /⋆ demux1, demux2: file descriptor of video and audio filters ⋆/ + /⋆ vpid, apid: PIDs of video and audio channels ⋆/ + int record_dvr(int demux1, int demux2, uint16_t vpid, uint16_t apid) + { + int i; + int len; + int written; + uint8_t buf[BUFFY]; + uint64_t length; + struct pollfd pfd[1]; + int dvr, dvr_out; + + /⋆ open dvr device ⋆/ + if ((dvr = open(DVR, O_RDONLY|O_NONBLOCK)) < 0){ + perror("DVR DEVICE"); + return -1; + } + + /⋆ switch video and audio demuxes to dvr ⋆/ + printf ("Switching dvr on\n"); + i = switch_to_record(demux1, demux2, vpid, apid); + printf("finished: "); + + printf("Recording %2.0f MB of test file in TS format\n", + MAX_LENGTH/(1024.0⋆1024.0)); + length = 0; + + /⋆ open output file ⋆/ + if ((dvr_out = open(DVR_FILE,O_WRONLY|O_CREAT + |O_TRUNC, S_IRUSR|S_IWUSR + |S_IRGRP|S_IWGRP|S_IROTH| + S_IWOTH)) < 0){ + perror("Can't open file for dvr test"); + return -1; + } + + pfd[0].fd = dvr; + pfd[0].events = POLLIN; + + /⋆ poll for dvr data and write to file ⋆/ + while (length < MAX_LENGTH ) { + if (poll(pfd,1,1)){ + if (pfd[0].revents & POLLIN){ + len = read(dvr, buf, BUFFY); + if (len < 0){ + perror("recording"); + return -1; + } + if (len > 0){ + written = 0; + while (written < len) + written += + write (dvr_out, + buf, len); + length += len; + printf("written %2.0f MB\r", + length/1024./1024.); + } + } + } + } + return 0; + } + +</programlisting> + +</section> diff --git a/Documentation/DocBook/media/dvb/frontend.xml b/Documentation/DocBook/media/dvb/frontend.xml new file mode 100644 index 00000000000..8a6a6ff27af --- /dev/null +++ b/Documentation/DocBook/media/dvb/frontend.xml @@ -0,0 +1,1548 @@ +<title>DVB Frontend API</title> + +<para>The DVB frontend device controls the tuner and DVB demodulator +hardware. It can be accessed through <emphasis +role="tt">/dev/dvb/adapter0/frontend0</emphasis>. Data types and and +ioctl definitions can be accessed by including <emphasis +role="tt">linux/dvb/frontend.h</emphasis> in your application.</para> + +<para>DVB frontends come in three varieties: DVB-S (satellite), DVB-C +(cable) and DVB-T (terrestrial). Transmission via the internet (DVB-IP) +is not yet handled by this API but a future extension is possible. For +DVB-S the frontend device also supports satellite equipment control +(SEC) via DiSEqC and V-SEC protocols. The DiSEqC (digital SEC) +specification is available from +<ulink url="http://www.eutelsat.com/satellites/4_5_5.html">Eutelsat</ulink>.</para> + +<para>Note that the DVB API may also be used for MPEG decoder-only PCI +cards, in which case there exists no frontend device.</para> + +<section id="frontend_types"> +<title>Frontend Data Types</title> + +<section id="fe-type-t"> +<title>Frontend type</title> + +<para>For historical reasons, frontend types are named by the type of modulation used in +transmission. The fontend types are given by fe_type_t type, defined as:</para> + +<table pgwide="1" frame="none" id="fe-type"> +<title>Frontend types</title> +<tgroup cols="3"> + &cs-def; + <thead> + <row> + <entry>fe_type</entry> + <entry>Description</entry> + <entry><link linkend="DTV-DELIVERY-SYSTEM">DTV_DELIVERY_SYSTEM</link> equivalent type</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry id="FE_QPSK"><constant>FE_QPSK</constant></entry> + <entry>For DVB-S standard</entry> + <entry><constant>SYS_DVBS</constant></entry> + </row> + <row> + <entry id="FE_QAM"><constant>FE_QAM</constant></entry> + <entry>For DVB-C annex A standard</entry> + <entry><constant>SYS_DVBC_ANNEX_A</constant></entry> + </row> + <row> + <entry id="FE_OFDM"><constant>FE_OFDM</constant></entry> + <entry>For DVB-T standard</entry> + <entry><constant>SYS_DVBT</constant></entry> + </row> + <row> + <entry id="FE_ATSC"><constant>FE_ATSC</constant></entry> + <entry>For ATSC standard (terrestrial) or for DVB-C Annex B (cable) used in US.</entry> + <entry><constant>SYS_ATSC</constant> (terrestrial) or <constant>SYS_DVBC_ANNEX_B</constant> (cable)</entry> + </row> +</tbody></tgroup></table> + +<para>Newer formats like DVB-S2, ISDB-T, ISDB-S and DVB-T2 are not described at the above, as they're +supported via the new <link linkend="FE_GET_SET_PROPERTY">FE_GET_PROPERTY/FE_GET_SET_PROPERTY</link> ioctl's, using the <link linkend="DTV-DELIVERY-SYSTEM">DTV_DELIVERY_SYSTEM</link> parameter. +</para> + +<para>The usage of this field is deprecated, as it doesn't report all supported standards, and +will provide an incomplete information for frontends that support multiple delivery systems. +Please use <link linkend="DTV-ENUM-DELSYS">DTV_ENUM_DELSYS</link> instead.</para> +</section> + +<section id="fe-caps-t"> +<title>frontend capabilities</title> + +<para>Capabilities describe what a frontend can do. Some capabilities can only be supported for +a specific frontend type.</para> +<programlisting> + typedef enum fe_caps { + FE_IS_STUPID = 0, + FE_CAN_INVERSION_AUTO = 0x1, + FE_CAN_FEC_1_2 = 0x2, + FE_CAN_FEC_2_3 = 0x4, + FE_CAN_FEC_3_4 = 0x8, + FE_CAN_FEC_4_5 = 0x10, + FE_CAN_FEC_5_6 = 0x20, + FE_CAN_FEC_6_7 = 0x40, + FE_CAN_FEC_7_8 = 0x80, + FE_CAN_FEC_8_9 = 0x100, + FE_CAN_FEC_AUTO = 0x200, + FE_CAN_QPSK = 0x400, + FE_CAN_QAM_16 = 0x800, + FE_CAN_QAM_32 = 0x1000, + FE_CAN_QAM_64 = 0x2000, + FE_CAN_QAM_128 = 0x4000, + FE_CAN_QAM_256 = 0x8000, + FE_CAN_QAM_AUTO = 0x10000, + FE_CAN_TRANSMISSION_MODE_AUTO = 0x20000, + FE_CAN_BANDWIDTH_AUTO = 0x40000, + FE_CAN_GUARD_INTERVAL_AUTO = 0x80000, + FE_CAN_HIERARCHY_AUTO = 0x100000, + FE_CAN_8VSB = 0x200000, + FE_CAN_16VSB = 0x400000, + FE_HAS_EXTENDED_CAPS = 0x800000, + FE_CAN_MULTISTREAM = 0x4000000, + FE_CAN_TURBO_FEC = 0x8000000, + FE_CAN_2G_MODULATION = 0x10000000, + FE_NEEDS_BENDING = 0x20000000, + FE_CAN_RECOVER = 0x40000000, + FE_CAN_MUTE_TS = 0x80000000 + } fe_caps_t; +</programlisting> +</section> + +<section id="dvb-frontend-info"> +<title>frontend information</title> + +<para>Information about the frontend ca be queried with + <link linkend="FE_GET_INFO">FE_GET_INFO</link>.</para> + +<programlisting> + struct dvb_frontend_info { + char name[128]; + fe_type_t type; + uint32_t frequency_min; + uint32_t frequency_max; + uint32_t frequency_stepsize; + uint32_t frequency_tolerance; + uint32_t symbol_rate_min; + uint32_t symbol_rate_max; + uint32_t symbol_rate_tolerance; /⋆ ppm ⋆/ + uint32_t notifier_delay; /⋆ ms ⋆/ + fe_caps_t caps; + }; +</programlisting> +</section> + +<section id="dvb-diseqc-master-cmd"> +<title>diseqc master command</title> + +<para>A message sent from the frontend to DiSEqC capable equipment.</para> +<programlisting> + struct dvb_diseqc_master_cmd { + uint8_t msg [6]; /⋆ { framing, address, command, data[3] } ⋆/ + uint8_t msg_len; /⋆ valid values are 3...6 ⋆/ + }; +</programlisting> +</section> +<section role="subsection" id="dvb-diseqc-slave-reply"> +<title>diseqc slave reply</title> + +<para>A reply to the frontend from DiSEqC 2.0 capable equipment.</para> +<programlisting> + struct dvb_diseqc_slave_reply { + uint8_t msg [4]; /⋆ { framing, data [3] } ⋆/ + uint8_t msg_len; /⋆ valid values are 0...4, 0 means no msg ⋆/ + int timeout; /⋆ return from ioctl after timeout ms with ⋆/ + }; /⋆ errorcode when no message was received ⋆/ +</programlisting> +</section> + +<section id="fe-sec-voltage-t"> +<title>diseqc slave reply</title> +<para>The voltage is usually used with non-DiSEqC capable LNBs to switch the polarzation +(horizontal/vertical). When using DiSEqC epuipment this voltage has to be switched +consistently to the DiSEqC commands as described in the DiSEqC spec.</para> +<programlisting> + typedef enum fe_sec_voltage { + SEC_VOLTAGE_13, + SEC_VOLTAGE_18 + } fe_sec_voltage_t; +</programlisting> +</section> + +<section id="fe-sec-tone-mode-t"> +<title>SEC continuous tone</title> + +<para>The continuous 22KHz tone is usually used with non-DiSEqC capable LNBs to switch the +high/low band of a dual-band LNB. When using DiSEqC epuipment this voltage has to +be switched consistently to the DiSEqC commands as described in the DiSEqC +spec.</para> +<programlisting> + typedef enum fe_sec_tone_mode { + SEC_TONE_ON, + SEC_TONE_OFF + } fe_sec_tone_mode_t; +</programlisting> +</section> + +<section id="fe-sec-mini-cmd-t"> +<title>SEC tone burst</title> + +<para>The 22KHz tone burst is usually used with non-DiSEqC capable switches to select +between two connected LNBs/satellites. When using DiSEqC epuipment this voltage has to +be switched consistently to the DiSEqC commands as described in the DiSEqC +spec.</para> +<programlisting> + typedef enum fe_sec_mini_cmd { + SEC_MINI_A, + SEC_MINI_B + } fe_sec_mini_cmd_t; +</programlisting> + +<para></para> +</section> + +<section id="fe-status-t"> +<title>frontend status</title> +<para>Several functions of the frontend device use the fe_status data type defined +by</para> +<programlisting> +typedef enum fe_status { + FE_HAS_SIGNAL = 0x01, + FE_HAS_CARRIER = 0x02, + FE_HAS_VITERBI = 0x04, + FE_HAS_SYNC = 0x08, + FE_HAS_LOCK = 0x10, + FE_TIMEDOUT = 0x20, + FE_REINIT = 0x40, +} fe_status_t; +</programlisting> +<para>to indicate the current state and/or state changes of the frontend hardware: +</para> + +<informaltable><tgroup cols="2"><tbody> +<row> +<entry align="char">FE_HAS_SIGNAL</entry> +<entry align="char">The frontend has found something above the noise level</entry> +</row><row> +<entry align="char">FE_HAS_CARRIER</entry> +<entry align="char">The frontend has found a DVB signal</entry> +</row><row> +<entry align="char">FE_HAS_VITERBI</entry> +<entry align="char">The frontend FEC inner coding (Viterbi, LDPC or other inner code) is stable</entry> +</row><row> +<entry align="char">FE_HAS_SYNC</entry> +<entry align="char">Synchronization bytes was found</entry> +</row><row> +<entry align="char">FE_HAS_LOCK</entry> +<entry align="char">The DVB were locked and everything is working</entry> +</row><row> +<entry align="char">FE_TIMEDOUT</entry> +<entry align="char">no lock within the last about 2 seconds</entry> +</row><row> +<entry align="char">FE_REINIT</entry> +<entry align="char">The frontend was reinitialized, application is +recommended to reset DiSEqC, tone and parameters</entry> +</row> +</tbody></tgroup></informaltable> + +</section> + +<section id="dvb-frontend-parameters"> +<title>frontend parameters</title> +<para>The kind of parameters passed to the frontend device for tuning depend on +the kind of hardware you are using.</para> +<para>The struct <constant>dvb_frontend_parameters</constant> uses an +union with specific per-system parameters. However, as newer delivery systems +required more data, the structure size weren't enough to fit, and just +extending its size would break the existing applications. So, those parameters +were replaced by the usage of <link linkend="FE_GET_SET_PROPERTY"> +<constant>FE_GET_PROPERTY/FE_SET_PROPERTY</constant></link> ioctl's. The +new API is flexible enough to add new parameters to existing delivery systems, +and to add newer delivery systems.</para> +<para>So, newer applications should use <link linkend="FE_GET_SET_PROPERTY"> +<constant>FE_GET_PROPERTY/FE_SET_PROPERTY</constant></link> instead, in +order to be able to support the newer System Delivery like DVB-S2, DVB-T2, +DVB-C2, ISDB, etc.</para> +<para>All kinds of parameters are combined as an union in the FrontendParameters structure: +<programlisting> +struct dvb_frontend_parameters { + uint32_t frequency; /⋆ (absolute) frequency in Hz for QAM/OFDM ⋆/ + /⋆ intermediate frequency in kHz for QPSK ⋆/ + fe_spectral_inversion_t inversion; + union { + struct dvb_qpsk_parameters qpsk; + struct dvb_qam_parameters qam; + struct dvb_ofdm_parameters ofdm; + struct dvb_vsb_parameters vsb; + } u; +}; +</programlisting></para> +<para>In the case of QPSK frontends the <constant>frequency</constant> field specifies the intermediate +frequency, i.e. the offset which is effectively added to the local oscillator frequency (LOF) of +the LNB. The intermediate frequency has to be specified in units of kHz. For QAM and +OFDM frontends the <constant>frequency</constant> specifies the absolute frequency and is given in Hz. +</para> + +<section id="dvb-qpsk-parameters"> +<title>QPSK parameters</title> +<para>For satellite QPSK frontends you have to use the <constant>dvb_qpsk_parameters</constant> structure:</para> +<programlisting> + struct dvb_qpsk_parameters { + uint32_t symbol_rate; /⋆ symbol rate in Symbols per second ⋆/ + fe_code_rate_t fec_inner; /⋆ forward error correction (see above) ⋆/ + }; +</programlisting> +</section> +<section id="dvb-qam-parameters"> +<title>QAM parameters</title> +<para>for cable QAM frontend you use the <constant>dvb_qam_parameters</constant> structure:</para> +<programlisting> + struct dvb_qam_parameters { + uint32_t symbol_rate; /⋆ symbol rate in Symbols per second ⋆/ + fe_code_rate_t fec_inner; /⋆ forward error correction (see above) ⋆/ + fe_modulation_t modulation; /⋆ modulation type (see above) ⋆/ + }; +</programlisting> +</section> +<section id="dvb-vsb-parameters"> +<title>VSB parameters</title> +<para>ATSC frontends are supported by the <constant>dvb_vsb_parameters</constant> structure:</para> +<programlisting> +struct dvb_vsb_parameters { + fe_modulation_t modulation; /⋆ modulation type (see above) ⋆/ +}; +</programlisting> +</section> +<section id="dvb-ofdm-parameters"> +<title>OFDM parameters</title> +<para>DVB-T frontends are supported by the <constant>dvb_ofdm_parameters</constant> structure:</para> +<programlisting> + struct dvb_ofdm_parameters { + fe_bandwidth_t bandwidth; + fe_code_rate_t code_rate_HP; /⋆ high priority stream code rate ⋆/ + fe_code_rate_t code_rate_LP; /⋆ low priority stream code rate ⋆/ + fe_modulation_t constellation; /⋆ modulation type (see above) ⋆/ + fe_transmit_mode_t transmission_mode; + fe_guard_interval_t guard_interval; + fe_hierarchy_t hierarchy_information; + }; +</programlisting> +</section> +<section id="fe-spectral-inversion-t"> +<title>frontend spectral inversion</title> +<para>The Inversion field can take one of these values: +</para> +<programlisting> +typedef enum fe_spectral_inversion { + INVERSION_OFF, + INVERSION_ON, + INVERSION_AUTO +} fe_spectral_inversion_t; +</programlisting> +<para>It indicates if spectral inversion should be presumed or not. In the automatic setting +(<constant>INVERSION_AUTO</constant>) the hardware will try to figure out the correct setting by +itself. +</para> +</section> +<section id="fe-code-rate-t"> +<title>frontend code rate</title> +<para>The possible values for the <constant>fec_inner</constant> field used on +<link linkend="dvb-qpsk-parameters"><constant>struct dvb_qpsk_parameters</constant></link> and +<link linkend="dvb-qam-parameters"><constant>struct dvb_qam_parameters</constant></link> are: +</para> +<programlisting> +typedef enum fe_code_rate { + FEC_NONE = 0, + FEC_1_2, + FEC_2_3, + FEC_3_4, + FEC_4_5, + FEC_5_6, + FEC_6_7, + FEC_7_8, + FEC_8_9, + FEC_AUTO, + FEC_3_5, + FEC_9_10, +} fe_code_rate_t; +</programlisting> +<para>which correspond to error correction rates of 1/2, 2/3, etc., no error correction or auto +detection. +</para> +</section> +<section id="fe-modulation-t"> +<title>frontend modulation type for QAM, OFDM and VSB</title> +<para>For cable and terrestrial frontends, e. g. for +<link linkend="dvb-qam-parameters"><constant>struct dvb_qpsk_parameters</constant></link>, +<link linkend="dvb-ofdm-parameters"><constant>struct dvb_qam_parameters</constant></link> and +<link linkend="dvb-vsb-parameters"><constant>struct dvb_qam_parameters</constant></link>, +it needs to specify the quadrature modulation mode which can be one of the following: +</para> +<programlisting> + typedef enum fe_modulation { + QPSK, + QAM_16, + QAM_32, + QAM_64, + QAM_128, + QAM_256, + QAM_AUTO, + VSB_8, + VSB_16, + PSK_8, + APSK_16, + APSK_32, + DQPSK, + } fe_modulation_t; +</programlisting> +</section> +<section> +<title>More OFDM parameters</title> +<section id="fe-transmit-mode-t"> +<title>Number of carriers per channel</title> +<programlisting> +typedef enum fe_transmit_mode { + TRANSMISSION_MODE_2K, + TRANSMISSION_MODE_8K, + TRANSMISSION_MODE_AUTO, + TRANSMISSION_MODE_4K, + TRANSMISSION_MODE_1K, + TRANSMISSION_MODE_16K, + TRANSMISSION_MODE_32K, + } fe_transmit_mode_t; +</programlisting> +</section> +<section id="fe-bandwidth-t"> +<title>frontend bandwidth</title> +<programlisting> +typedef enum fe_bandwidth { + BANDWIDTH_8_MHZ, + BANDWIDTH_7_MHZ, + BANDWIDTH_6_MHZ, + BANDWIDTH_AUTO, + BANDWIDTH_5_MHZ, + BANDWIDTH_10_MHZ, + BANDWIDTH_1_712_MHZ, +} fe_bandwidth_t; +</programlisting> +</section> +<section id="fe-guard-interval-t"> +<title>frontend guard inverval</title> +<programlisting> +typedef enum fe_guard_interval { + GUARD_INTERVAL_1_32, + GUARD_INTERVAL_1_16, + GUARD_INTERVAL_1_8, + GUARD_INTERVAL_1_4, + GUARD_INTERVAL_AUTO, + GUARD_INTERVAL_1_128, + GUARD_INTERVAL_19_128, + GUARD_INTERVAL_19_256, +} fe_guard_interval_t; +</programlisting> +</section> +<section id="fe-hierarchy-t"> +<title>frontend hierarchy</title> +<programlisting> +typedef enum fe_hierarchy { + HIERARCHY_NONE, + HIERARCHY_1, + HIERARCHY_2, + HIERARCHY_4, + HIERARCHY_AUTO + } fe_hierarchy_t; +</programlisting> +</section> +</section> + +</section> + +<section id="dvb-frontend-event"> +<title>frontend events</title> + <programlisting> + struct dvb_frontend_event { + fe_status_t status; + struct dvb_frontend_parameters parameters; + }; +</programlisting> + </section> +</section> + + +<section id="frontend_fcalls"> +<title>Frontend Function Calls</title> + +<section id="frontend_f_open"> +<title>open()</title> +<para>DESCRIPTION</para> +<informaltable><tgroup cols="1"><tbody><row> +<entry align="char"> +<para>This system call opens a named frontend device (/dev/dvb/adapter0/frontend0) + for subsequent use. Usually the first thing to do after a successful open is to + find out the frontend type with <link linkend="FE_GET_INFO">FE_GET_INFO</link>.</para> +<para>The device can be opened in read-only mode, which only allows monitoring of + device status and statistics, or read/write mode, which allows any kind of use + (e.g. performing tuning operations.) +</para> +<para>In a system with multiple front-ends, it is usually the case that multiple devices + cannot be open in read/write mode simultaneously. As long as a front-end + device is opened in read/write mode, other open() calls in read/write mode will + either fail or block, depending on whether non-blocking or blocking mode was + specified. A front-end device opened in blocking mode can later be put into + non-blocking mode (and vice versa) using the F_SETFL command of the fcntl + system call. This is a standard system call, documented in the Linux manual + page for fcntl. When an open() call has succeeded, the device will be ready + for use in the specified mode. This implies that the corresponding hardware is + powered up, and that other front-ends may have been powered down to make + that possible.</para> +</entry> + </row></tbody></tgroup></informaltable> + +<para>SYNOPSIS</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int open(const char ⋆deviceName, int flags);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>const char + *deviceName</para> +</entry><entry + align="char"> +<para>Name of specific video device.</para> +</entry> + </row><row><entry + align="char"> +<para>int flags</para> +</entry><entry + align="char"> +<para>A bit-wise OR of the following flags:</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>O_RDONLY read-only access</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>O_RDWR read/write access</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>O_NONBLOCK open in non-blocking mode</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>(blocking mode is the default)</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURN VALUE</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>ENODEV</para> +</entry><entry + align="char"> +<para>Device driver not loaded/available.</para> +</entry> + </row><row><entry + align="char"> +<para>EINTERNAL</para> +</entry><entry + align="char"> +<para>Internal error.</para> +</entry> + </row><row><entry + align="char"> +<para>EBUSY</para> +</entry><entry + align="char"> +<para>Device or resource busy.</para> +</entry> + </row><row><entry + align="char"> +<para>EINVAL</para> +</entry><entry + align="char"> +<para>Invalid argument.</para> +</entry> + </row></tbody></tgroup></informaltable> +</section> + +<section id="frontend_f_close"> +<title>close()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This system call closes a previously opened front-end device. After closing + a front-end device, its corresponding hardware might be powered down + automatically.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int close(int fd);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURN VALUE</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>EBADF</para> +</entry><entry + align="char"> +<para>fd is not a valid open file descriptor.</para> +</entry> + </row></tbody></tgroup></informaltable> +</section> + +<section id="FE_READ_STATUS"> +<title>FE_READ_STATUS</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call returns status information about the front-end. This call only + requires read-only access to the device.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = <link linkend="FE_READ_STATUS">FE_READ_STATUS</link>, + fe_status_t ⋆status);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> + +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals <link linkend="FE_READ_STATUS">FE_READ_STATUS</link> for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>struct fe_status_t + *status</para> +</entry><entry + align="char"> +<para>Points to the location where the front-end status word is + to be stored.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURN VALUE</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>EBADF</para> +</entry><entry + align="char"> +<para>fd is not a valid open file descriptor.</para> +</entry> + </row><row><entry + align="char"> +<para>EFAULT</para> +</entry><entry + align="char"> +<para>status points to invalid address.</para> +</entry> + </row></tbody></tgroup></informaltable> +</section> + +<section id="FE_READ_BER"> +<title>FE_READ_BER</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call returns the bit error rate for the signal currently + received/demodulated by the front-end. For this command, read-only access to + the device is sufficient.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = <link linkend="FE_READ_BER">FE_READ_BER</link>, + uint32_t ⋆ber);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals <link linkend="FE_READ_BER">FE_READ_BER</link> for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>uint32_t *ber</para> +</entry><entry + align="char"> +<para>The bit error rate is stored into *ber.</para> +</entry> + </row></tbody></tgroup></informaltable> + +&return-value-dvb; +</section> + +<section id="FE_READ_SNR"> +<title>FE_READ_SNR</title> + +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call returns the signal-to-noise ratio for the signal currently received + by the front-end. For this command, read-only access to the device is sufficient.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = <link linkend="FE_READ_SNR">FE_READ_SNR</link>, uint16_t + ⋆snr);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals <link linkend="FE_READ_SNR">FE_READ_SNR</link> for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>uint16_t *snr</para> +</entry><entry + align="char"> +<para>The signal-to-noise ratio is stored into *snr.</para> +</entry> + </row></tbody></tgroup></informaltable> + +&return-value-dvb; +</section> + +<section id="FE_READ_SIGNAL_STRENGTH"> +<title>FE_READ_SIGNAL_STRENGTH</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call returns the signal strength value for the signal currently received + by the front-end. For this command, read-only access to the device is sufficient.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl( int fd, int request = + <link linkend="FE_READ_SIGNAL_STRENGTH">FE_READ_SIGNAL_STRENGTH</link>, uint16_t ⋆strength);</para> +</entry> + </row></tbody></tgroup></informaltable> + +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals <link linkend="FE_READ_SIGNAL_STRENGTH">FE_READ_SIGNAL_STRENGTH</link> for this + command.</para> +</entry> + </row><row><entry + align="char"> +<para>uint16_t *strength</para> +</entry><entry + align="char"> +<para>The signal strength value is stored into *strength.</para> +</entry> + </row></tbody></tgroup></informaltable> + +&return-value-dvb; +</section> + +<section id="FE_READ_UNCORRECTED_BLOCKS"> +<title>FE_READ_UNCORRECTED_BLOCKS</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call returns the number of uncorrected blocks detected by the device + driver during its lifetime. For meaningful measurements, the increment in block + count during a specific time interval should be calculated. For this command, + read-only access to the device is sufficient.</para> +</entry> + </row><row><entry + align="char"> +<para>Note that the counter will wrap to zero after its maximum count has been + reached.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl( int fd, int request = + <link linkend="FE_READ_UNCORRECTED_BLOCKS">FE_READ_UNCORRECTED_BLOCKS</link>, uint32_t ⋆ublocks);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals <link linkend="FE_READ_UNCORRECTED_BLOCKS">FE_READ_UNCORRECTED_BLOCKS</link> for this + command.</para> +</entry> + </row><row><entry + align="char"> +<para>uint32_t *ublocks</para> +</entry><entry + align="char"> +<para>The total number of uncorrected blocks seen by the driver + so far.</para> +</entry> + </row></tbody></tgroup></informaltable> + +&return-value-dvb; +</section> + +<section id="FE_SET_FRONTEND"> +<title>FE_SET_FRONTEND</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call starts a tuning operation using specified parameters. The result + of this call will be successful if the parameters were valid and the tuning could + be initiated. The result of the tuning operation in itself, however, will arrive + asynchronously as an event (see documentation for <link linkend="FE_GET_EVENT">FE_GET_EVENT</link> and + FrontendEvent.) If a new <link linkend="FE_SET_FRONTEND">FE_SET_FRONTEND</link> operation is initiated before + the previous one was completed, the previous operation will be aborted in favor + of the new one. This command requires read/write access to the device.</para> +</entry> + </row></tbody></tgroup></informaltable> + +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = <link linkend="FE_SET_FRONTEND">FE_SET_FRONTEND</link>, + struct dvb_frontend_parameters ⋆p);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals <link linkend="FE_SET_FRONTEND">FE_SET_FRONTEND</link> for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>struct + dvb_frontend_parameters + *p</para> +</entry><entry + align="char"> +<para>Points to parameters for tuning operation.</para> +</entry> + </row></tbody></tgroup></informaltable> + +&return-value-dvb; +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>EINVAL</para> +</entry><entry + align="char"> +<para>Maximum supported symbol rate reached.</para> +</entry> +</row></tbody></tgroup></informaltable> +</section> + +<section id="FE_GET_FRONTEND"> +<title>FE_GET_FRONTEND</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call queries the currently effective frontend parameters. For this + command, read-only access to the device is sufficient.</para> +</entry> + </row></tbody></tgroup></informaltable> + +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = <link linkend="FE_GET_FRONTEND">FE_GET_FRONTEND</link>, + struct dvb_frontend_parameters ⋆p);</para> +</entry> + </row></tbody></tgroup></informaltable> + +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals <link linkend="FE_SET_FRONTEND">FE_SET_FRONTEND</link> for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>struct + dvb_frontend_parameters + *p</para> +</entry><entry + align="char"> +<para>Points to parameters for tuning operation.</para> +</entry> + </row></tbody></tgroup></informaltable> + +&return-value-dvb; +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>EINVAL</para> +</entry><entry + align="char"> +<para>Maximum supported symbol rate reached.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section> + +<section id="FE_GET_EVENT"> +<title>FE_GET_EVENT</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call returns a frontend event if available. If an event is not + available, the behavior depends on whether the device is in blocking or + non-blocking mode. In the latter case, the call fails immediately with errno + set to EWOULDBLOCK. In the former case, the call blocks until an event + becomes available.</para> +</entry> + </row><row><entry + align="char"> +<para>The standard Linux poll() and/or select() system calls can be used with the + device file descriptor to watch for new events. For select(), the file descriptor + should be included in the exceptfds argument, and for poll(), POLLPRI should + be specified as the wake-up condition. Since the event queue allocated is + rather small (room for 8 events), the queue must be serviced regularly to avoid + overflow. If an overflow happens, the oldest event is discarded from the queue, + and an error (EOVERFLOW) occurs the next time the queue is read. After + reporting the error condition in this fashion, subsequent + <link linkend="FE_GET_EVENT">FE_GET_EVENT</link> + calls will return events from the queue as usual.</para> +</entry> + </row><row><entry + align="char"> +<para>For the sake of implementation simplicity, this command requires read/write + access to the device.</para> +</entry> + </row></tbody></tgroup></informaltable> + +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = QPSK_GET_EVENT, + struct dvb_frontend_event ⋆ev);</para> +</entry> + </row></tbody></tgroup></informaltable> + +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals <link linkend="FE_GET_EVENT">FE_GET_EVENT</link> for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>struct + dvb_frontend_event + *ev</para> +</entry><entry + align="char"> +<para>Points to the location where the event,</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>if any, is to be stored.</para> +</entry> + </row></tbody></tgroup></informaltable> + +&return-value-dvb; +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>EWOULDBLOCK</para> +</entry><entry + align="char"> +<para>There is no event pending, and the device is in + non-blocking mode.</para> +</entry> + </row><row><entry + align="char"> +<para>EOVERFLOW</para> +</entry><entry + align="char"> +<para>Overflow in event queue - one or more events were lost.</para> +</entry> +</row></tbody></tgroup></informaltable> +</section> + +<section id="FE_GET_INFO"> +<title>FE_GET_INFO</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call returns information about the front-end. This call only requires + read-only access to the device.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> + +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para> int ioctl(int fd, int request = <link linkend="FE_GET_INFO">FE_GET_INFO</link>, struct + dvb_frontend_info ⋆info);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> + +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals <link linkend="FE_GET_INFO">FE_GET_INFO</link> for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>struct + dvb_frontend_info + *info</para> +</entry><entry + align="char"> +<para>Points to the location where the front-end information is + to be stored.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +</section> + +<section id="FE_DISEQC_RESET_OVERLOAD"> +<title>FE_DISEQC_RESET_OVERLOAD</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>If the bus has been automatically powered off due to power overload, this ioctl + call restores the power to the bus. The call requires read/write access to the + device. This call has no effect if the device is manually powered off. Not all + DVB adapters support this ioctl.</para> +</entry> + </row></tbody></tgroup></informaltable> + +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = + <link linkend="FE_DISEQC_RESET_OVERLOAD">FE_DISEQC_RESET_OVERLOAD</link>);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals <link linkend="FE_DISEQC_RESET_OVERLOAD">FE_DISEQC_RESET_OVERLOAD</link> for this + command.</para> +</entry> + </row></tbody></tgroup></informaltable> + +&return-value-dvb; +</section> + +<section id="FE_DISEQC_SEND_MASTER_CMD"> +<title>FE_DISEQC_SEND_MASTER_CMD</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call is used to send a a DiSEqC command.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = + <link linkend="FE_DISEQC_SEND_MASTER_CMD">FE_DISEQC_SEND_MASTER_CMD</link>, struct + dvb_diseqc_master_cmd ⋆cmd);</para> +</entry> + </row></tbody></tgroup></informaltable> + +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals <link linkend="FE_DISEQC_SEND_MASTER_CMD">FE_DISEQC_SEND_MASTER_CMD</link> for this + command.</para> +</entry> + </row><row><entry + align="char"> +<para>struct + dvb_diseqc_master_cmd + *cmd</para> +</entry><entry + align="char"> +<para>Pointer to the command to be transmitted.</para> +</entry> + </row></tbody></tgroup></informaltable> + +&return-value-dvb; +</section> + +<section id="FE_DISEQC_RECV_SLAVE_REPLY"> +<title>FE_DISEQC_RECV_SLAVE_REPLY</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call is used to receive reply to a DiSEqC 2.0 command.</para> +</entry> + </row></tbody></tgroup></informaltable> + +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = + <link linkend="FE_DISEQC_RECV_SLAVE_REPLY">FE_DISEQC_RECV_SLAVE_REPLY</link>, struct + dvb_diseqc_slave_reply ⋆reply);</para> +</entry> + </row></tbody></tgroup></informaltable> + +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals <link linkend="FE_DISEQC_RECV_SLAVE_REPLY">FE_DISEQC_RECV_SLAVE_REPLY</link> for this + command.</para> +</entry> + </row><row><entry + align="char"> +<para>struct + dvb_diseqc_slave_reply + *reply</para> +</entry><entry + align="char"> +<para>Pointer to the command to be received.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +</section> + +<section id="FE_DISEQC_SEND_BURST"> +<title>FE_DISEQC_SEND_BURST</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call is used to send a 22KHz tone burst.</para> +</entry> + </row></tbody></tgroup></informaltable> + +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = + <link linkend="FE_DISEQC_SEND_BURST">FE_DISEQC_SEND_BURST</link>, fe_sec_mini_cmd_t burst);</para> +</entry> + </row></tbody></tgroup></informaltable> + +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals <link linkend="FE_DISEQC_SEND_BURST">FE_DISEQC_SEND_BURST</link> for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>fe_sec_mini_cmd_t + burst</para> +</entry><entry + align="char"> +<para>burst A or B.</para> +</entry> + </row></tbody></tgroup></informaltable> + +&return-value-dvb; +</section> + +<section id="FE_SET_TONE"> +<title>FE_SET_TONE</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This call is used to set the generation of the continuous 22kHz tone. This call + requires read/write permissions.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = <link linkend="FE_SET_TONE">FE_SET_TONE</link>, + fe_sec_tone_mode_t tone);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals <link linkend="FE_SET_TONE">FE_SET_TONE</link> for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>fe_sec_tone_mode_t + tone</para> +</entry><entry + align="char"> +<para>The requested tone generation mode (on/off).</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +</section> + +<section id="FE_SET_VOLTAGE"> +<title>FE_SET_VOLTAGE</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This call is used to set the bus voltage. This call requires read/write + permissions.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = <link linkend="FE_SET_VOLTAGE">FE_SET_VOLTAGE</link>, + fe_sec_voltage_t voltage);</para> +</entry> + </row></tbody></tgroup></informaltable> + +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals <link linkend="FE_SET_VOLTAGE">FE_SET_VOLTAGE</link> for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>fe_sec_voltage_t + voltage</para> +</entry><entry + align="char"> +<para>The requested bus voltage.</para> +</entry> + </row></tbody></tgroup></informaltable> + +&return-value-dvb; +</section> + +<section id="FE_ENABLE_HIGH_LNB_VOLTAGE"> +<title>FE_ENABLE_HIGH_LNB_VOLTAGE</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>If high != 0 enables slightly higher voltages instead of 13/18V (to compensate + for long cables). This call requires read/write permissions. Not all DVB + adapters support this ioctl.</para> +</entry> + </row></tbody></tgroup></informaltable> + +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = + <link linkend="FE_ENABLE_HIGH_LNB_VOLTAGE">FE_ENABLE_HIGH_LNB_VOLTAGE</link>, int high);</para> +</entry> + </row></tbody></tgroup></informaltable> + +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals <link linkend="FE_SET_VOLTAGE">FE_SET_VOLTAGE</link> for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>int high</para> +</entry><entry + align="char"> +<para>The requested bus voltage.</para> +</entry> + </row></tbody></tgroup></informaltable> + +&return-value-dvb; +</section> + +<section id="FE_SET_FRONTEND_TUNE_MODE"> +<title>FE_SET_FRONTEND_TUNE_MODE</title> +<para>DESCRIPTION</para> +<informaltable><tgroup cols="1"><tbody><row> +<entry align="char"> +<para>Allow setting tuner mode flags to the frontend.</para> +</entry> +</row></tbody></tgroup></informaltable> + +<para>SYNOPSIS</para> +<informaltable><tgroup cols="1"><tbody><row> +<entry align="char"> +<para>int ioctl(int fd, int request = +<link linkend="FE_SET_FRONTEND_TUNE_MODE">FE_SET_FRONTEND_TUNE_MODE</link>, unsigned int flags);</para> +</entry> +</row></tbody></tgroup></informaltable> + +<para>PARAMETERS</para> +<informaltable><tgroup cols="2"><tbody><row> +<entry align="char"> + <para>unsigned int flags</para> +</entry> +<entry align="char"> +<para> +FE_TUNE_MODE_ONESHOT When set, this flag will disable any zigzagging or other "normal" tuning behaviour. Additionally, there will be no automatic monitoring of the lock status, and hence no frontend events will be generated. If a frontend device is closed, this flag will be automatically turned off when the device is reopened read-write. +</para> +</entry> + </row></tbody></tgroup></informaltable> + +&return-value-dvb; +</section> + +<section id="FE_DISHNETWORK_SEND_LEGACY_CMD"> + <title>FE_DISHNETWORK_SEND_LEGACY_CMD</title> +<para>DESCRIPTION</para> +<informaltable><tgroup cols="1"><tbody><row> +<entry align="char"> +<para>WARNING: This is a very obscure legacy command, used only at stv0299 driver. Should not be used on newer drivers.</para> +<para>It provides a non-standard method for selecting Diseqc voltage on the frontend, for Dish Network legacy switches.</para> +<para>As support for this ioctl were added in 2004, this means that such dishes were already legacy in 2004.</para> +</entry> +</row></tbody></tgroup></informaltable> + +<para>SYNOPSIS</para> +<informaltable><tgroup cols="1"><tbody><row> +<entry align="char"> +<para>int ioctl(int fd, int request = + <link linkend="FE_DISHNETWORK_SEND_LEGACY_CMD">FE_DISHNETWORK_SEND_LEGACY_CMD</link>, unsigned long cmd);</para> +</entry> +</row></tbody></tgroup></informaltable> + +<para>PARAMETERS</para> +<informaltable><tgroup cols="2"><tbody><row> +<entry align="char"> + <para>unsigned long cmd</para> +</entry> +<entry align="char"> +<para> +sends the specified raw cmd to the dish via DISEqC. +</para> +</entry> + </row></tbody></tgroup></informaltable> + +&return-value-dvb; +</section> + +</section> + +&sub-dvbproperty; diff --git a/Documentation/DocBook/media/dvb/intro.xml b/Documentation/DocBook/media/dvb/intro.xml new file mode 100644 index 00000000000..2048b53d19b --- /dev/null +++ b/Documentation/DocBook/media/dvb/intro.xml @@ -0,0 +1,212 @@ +<title>Introduction</title> + +<section id="requisites"> +<title>What you need to know</title> + +<para>The reader of this document is required to have some knowledge in +the area of digital video broadcasting (DVB) and should be familiar with +part I of the MPEG2 specification ISO/IEC 13818 (aka ITU-T H.222), i.e +you should know what a program/transport stream (PS/TS) is and what is +meant by a packetized elementary stream (PES) or an I-frame.</para> + +<para>Various DVB standards documents are available from +<ulink url="http://www.dvb.org" /> and/or +<ulink url="http://www.etsi.org" />.</para> + +<para>It is also necessary to know how to access unix/linux devices and +how to use ioctl calls. This also includes the knowledge of C or C++. +</para> +</section> + +<section id="history"> +<title>History</title> + +<para>The first API for DVB cards we used at Convergence in late 1999 +was an extension of the Video4Linux API which was primarily developed +for frame grabber cards. As such it was not really well suited to be +used for DVB cards and their new features like recording MPEG streams +and filtering several section and PES data streams at the same time. +</para> + +<para>In early 2000, we were approached by Nokia with a proposal for a +new standard Linux DVB API. As a commitment to the development of +terminals based on open standards, Nokia and Convergence made it +available to all Linux developers and published it on +<ulink url="http://www.linuxtv.org/" /> in September 2000. +Convergence is the maintainer of the Linux DVB API. Together with the +LinuxTV community (i.e. you, the reader of this document), the Linux DVB +API will be constantly reviewed and improved. With the Linux driver for +the Siemens/Hauppauge DVB PCI card Convergence provides a first +implementation of the Linux DVB API.</para> +</section> + +<section id="overview"> +<title>Overview</title> + +<figure id="stb_components"> +<title>Components of a DVB card/STB</title> +<mediaobject> +<imageobject> +<imagedata fileref="dvbstb.pdf" format="PS" /> +</imageobject> +<imageobject> +<imagedata fileref="dvbstb.png" format="PNG" /> +</imageobject> +</mediaobject> +</figure> + +<para>A DVB PCI card or DVB set-top-box (STB) usually consists of the +following main hardware components: </para> + +<itemizedlist> + <listitem> + +<para>Frontend consisting of tuner and DVB demodulator</para> + +<para>Here the raw signal reaches the DVB hardware from a satellite dish +or antenna or directly from cable. The frontend down-converts and +demodulates this signal into an MPEG transport stream (TS). In case of a +satellite frontend, this includes a facility for satellite equipment +control (SEC), which allows control of LNB polarization, multi feed +switches or dish rotors.</para> + +</listitem> + <listitem> + +<para>Conditional Access (CA) hardware like CI adapters and smartcard slots +</para> + +<para>The complete TS is passed through the CA hardware. Programs to +which the user has access (controlled by the smart card) are decoded in +real time and re-inserted into the TS.</para> + +</listitem> + <listitem> + <para>Demultiplexer which filters the incoming DVB stream</para> + +<para>The demultiplexer splits the TS into its components like audio and +video streams. Besides usually several of such audio and video streams +it also contains data streams with information about the programs +offered in this or other streams of the same provider.</para> + +</listitem> +<listitem> + +<para>MPEG2 audio and video decoder</para> + +<para>The main targets of the demultiplexer are the MPEG2 audio and +video decoders. After decoding they pass on the uncompressed audio and +video to the computer screen or (through a PAL/NTSC encoder) to a TV +set.</para> + + +</listitem> +</itemizedlist> + +<para><xref linkend="stb_components" /> shows a crude schematic of the control and data flow +between those components.</para> + +<para>On a DVB PCI card not all of these have to be present since some +functionality can be provided by the main CPU of the PC (e.g. MPEG +picture and sound decoding) or is not needed (e.g. for data-only uses +like “internet over satellite”). Also not every card or STB +provides conditional access hardware.</para> + +</section> + +<section id="dvb_devices"> +<title>Linux DVB Devices</title> + +<para>The Linux DVB API lets you control these hardware components +through currently six Unix-style character devices for video, audio, +frontend, demux, CA and IP-over-DVB networking. The video and audio +devices control the MPEG2 decoder hardware, the frontend device the +tuner and the DVB demodulator. The demux device gives you control over +the PES and section filters of the hardware. If the hardware does not +support filtering these filters can be implemented in software. Finally, +the CA device controls all the conditional access capabilities of the +hardware. It can depend on the individual security requirements of the +platform, if and how many of the CA functions are made available to the +application through this device.</para> + +<para>All devices can be found in the <emphasis role="tt">/dev</emphasis> +tree under <emphasis role="tt">/dev/dvb</emphasis>. The individual devices +are called:</para> + +<itemizedlist> +<listitem> + +<para><emphasis role="tt">/dev/dvb/adapterN/audioM</emphasis>,</para> +</listitem> +<listitem> +<para><emphasis role="tt">/dev/dvb/adapterN/videoM</emphasis>,</para> +</listitem> +<listitem> +<para><emphasis role="tt">/dev/dvb/adapterN/frontendM</emphasis>,</para> +</listitem> + <listitem> + +<para><emphasis role="tt">/dev/dvb/adapterN/netM</emphasis>,</para> +</listitem> + <listitem> + +<para><emphasis role="tt">/dev/dvb/adapterN/demuxM</emphasis>,</para> +</listitem> + <listitem> + +<para><emphasis role="tt">/dev/dvb/adapterN/dvrM</emphasis>,</para> +</listitem> + <listitem> + +<para><emphasis role="tt">/dev/dvb/adapterN/caM</emphasis>,</para></listitem></itemizedlist> + +<para>where N enumerates the DVB PCI cards in a system starting +from 0, and M enumerates the devices of each type within each +adapter, starting from 0, too. We will omit the “<emphasis +role="tt">/dev/dvb/adapterN/</emphasis>” in the further dicussion +of these devices. The naming scheme for the devices is the same wheter +devfs is used or not.</para> + +<para>More details about the data structures and function calls of all +the devices are described in the following chapters.</para> + +</section> + +<section id="include_files"> +<title>API include files</title> + +<para>For each of the DVB devices a corresponding include file exists. +The DVB API include files should be included in application sources with +a partial path like:</para> + +<programlisting> + #include <linux/dvb/audio.h> +</programlisting> +<programlisting> + #include <linux/dvb/ca.h> +</programlisting> +<programlisting> + #include <linux/dvb/dmx.h> +</programlisting> +<programlisting> + #include <linux/dvb/frontend.h> +</programlisting> +<programlisting> + #include <linux/dvb/net.h> +</programlisting> +<programlisting> + #include <linux/dvb/osd.h> +</programlisting> +<programlisting> + #include <linux/dvb/video.h> +</programlisting> + +<para>To enable applications to support different API version, an +additional include file <emphasis +role="tt">linux/dvb/version.h</emphasis> exists, which defines the +constant <emphasis role="tt">DVB_API_VERSION</emphasis>. This document +describes <emphasis role="tt">DVB_API_VERSION 5.8</emphasis>. +</para> + +</section> + diff --git a/Documentation/DocBook/media/dvb/kdapi.xml b/Documentation/DocBook/media/dvb/kdapi.xml new file mode 100644 index 00000000000..6c11ec52cbe --- /dev/null +++ b/Documentation/DocBook/media/dvb/kdapi.xml @@ -0,0 +1,2309 @@ +<title>Kernel Demux API</title> +<para>The kernel demux API defines a driver-internal interface for registering low-level, +hardware specific driver to a hardware independent demux layer. It is only of interest for +DVB device driver writers. The header file for this API is named <emphasis role="tt">demux.h</emphasis> and located in +<emphasis role="tt">drivers/media/dvb-core</emphasis>. +</para> +<para>Maintainer note: This section must be reviewed. It is probably out of date. +</para> + +<section id="kernel_demux_data_types"> +<title>Kernel Demux Data Types</title> + + +<section id="dmx_success_t"> +<title>dmx_success_t</title> + <programlisting> + typedef enum { + DMX_OK = 0, /⋆ Received Ok ⋆/ + DMX_LENGTH_ERROR, /⋆ Incorrect length ⋆/ + DMX_OVERRUN_ERROR, /⋆ Receiver ring buffer overrun ⋆/ + DMX_CRC_ERROR, /⋆ Incorrect CRC ⋆/ + DMX_FRAME_ERROR, /⋆ Frame alignment error ⋆/ + DMX_FIFO_ERROR, /⋆ Receiver FIFO overrun ⋆/ + DMX_MISSED_ERROR /⋆ Receiver missed packet ⋆/ + } dmx_success_t; +</programlisting> + +</section> +<section id="ts_filter_types"> +<title>TS filter types</title> + <programlisting> + /⋆--------------------------------------------------------------------------⋆/ + /⋆ TS packet reception ⋆/ + /⋆--------------------------------------------------------------------------⋆/ + + /⋆ TS filter type for set_type() ⋆/ + + #define TS_PACKET 1 /⋆ send TS packets (188 bytes) to callback (default) ⋆/ + #define TS_PAYLOAD_ONLY 2 /⋆ in case TS_PACKET is set, only send the TS + payload (<=184 bytes per packet) to callback ⋆/ + #define TS_DECODER 4 /⋆ send stream to built-in decoder (if present) ⋆/ +</programlisting> + +</section> +<section id="dmx_ts_pes_t"> +<title>dmx_ts_pes_t</title> +<para>The structure +</para> +<programlisting> + typedef enum + { + DMX_TS_PES_AUDIO, /⋆ also send packets to audio decoder (if it exists) ⋆/ + DMX_TS_PES_VIDEO, /⋆ ... ⋆/ + DMX_TS_PES_TELETEXT, + DMX_TS_PES_SUBTITLE, + DMX_TS_PES_PCR, + DMX_TS_PES_OTHER, + } dmx_ts_pes_t; +</programlisting> +<para>describes the PES type for filters which write to a built-in decoder. The correspond (and +should be kept identical) to the types in the demux device. +</para> +<programlisting> + struct dmx_ts_feed_s { + int is_filtering; /⋆ Set to non-zero when filtering in progress ⋆/ + struct dmx_demux_s⋆ parent; /⋆ Back-pointer ⋆/ + void⋆ priv; /⋆ Pointer to private data of the API client ⋆/ + int (⋆set) (struct dmx_ts_feed_s⋆ feed, + __u16 pid, + size_t callback_length, + size_t circular_buffer_size, + int descramble, + struct timespec timeout); + int (⋆start_filtering) (struct dmx_ts_feed_s⋆ feed); + int (⋆stop_filtering) (struct dmx_ts_feed_s⋆ feed); + int (⋆set_type) (struct dmx_ts_feed_s⋆ feed, + int type, + dmx_ts_pes_t pes_type); + }; + + typedef struct dmx_ts_feed_s dmx_ts_feed_t; +</programlisting> + <programlisting> + /⋆--------------------------------------------------------------------------⋆/ + /⋆ PES packet reception (not supported yet) ⋆/ + /⋆--------------------------------------------------------------------------⋆/ + + typedef struct dmx_pes_filter_s { + struct dmx_pes_s⋆ parent; /⋆ Back-pointer ⋆/ + void⋆ priv; /⋆ Pointer to private data of the API client ⋆/ + } dmx_pes_filter_t; +</programlisting> + <programlisting> + typedef struct dmx_pes_feed_s { + int is_filtering; /⋆ Set to non-zero when filtering in progress ⋆/ + struct dmx_demux_s⋆ parent; /⋆ Back-pointer ⋆/ + void⋆ priv; /⋆ Pointer to private data of the API client ⋆/ + int (⋆set) (struct dmx_pes_feed_s⋆ feed, + __u16 pid, + size_t circular_buffer_size, + int descramble, + struct timespec timeout); + int (⋆start_filtering) (struct dmx_pes_feed_s⋆ feed); + int (⋆stop_filtering) (struct dmx_pes_feed_s⋆ feed); + int (⋆allocate_filter) (struct dmx_pes_feed_s⋆ feed, + dmx_pes_filter_t⋆⋆ filter); + int (⋆release_filter) (struct dmx_pes_feed_s⋆ feed, + dmx_pes_filter_t⋆ filter); + } dmx_pes_feed_t; +</programlisting> + <programlisting> + typedef struct { + __u8 filter_value [DMX_MAX_FILTER_SIZE]; + __u8 filter_mask [DMX_MAX_FILTER_SIZE]; + struct dmx_section_feed_s⋆ parent; /⋆ Back-pointer ⋆/ + void⋆ priv; /⋆ Pointer to private data of the API client ⋆/ + } dmx_section_filter_t; +</programlisting> + <programlisting> + struct dmx_section_feed_s { + int is_filtering; /⋆ Set to non-zero when filtering in progress ⋆/ + struct dmx_demux_s⋆ parent; /⋆ Back-pointer ⋆/ + void⋆ priv; /⋆ Pointer to private data of the API client ⋆/ + int (⋆set) (struct dmx_section_feed_s⋆ feed, + __u16 pid, + size_t circular_buffer_size, + int descramble, + int check_crc); + int (⋆allocate_filter) (struct dmx_section_feed_s⋆ feed, + dmx_section_filter_t⋆⋆ filter); + int (⋆release_filter) (struct dmx_section_feed_s⋆ feed, + dmx_section_filter_t⋆ filter); + int (⋆start_filtering) (struct dmx_section_feed_s⋆ feed); + int (⋆stop_filtering) (struct dmx_section_feed_s⋆ feed); + }; + typedef struct dmx_section_feed_s dmx_section_feed_t; + + /⋆--------------------------------------------------------------------------⋆/ + /⋆ Callback functions ⋆/ + /⋆--------------------------------------------------------------------------⋆/ + + typedef int (⋆dmx_ts_cb) ( __u8 ⋆ buffer1, + size_t buffer1_length, + __u8 ⋆ buffer2, + size_t buffer2_length, + dmx_ts_feed_t⋆ source, + dmx_success_t success); + + typedef int (⋆dmx_section_cb) ( __u8 ⋆ buffer1, + size_t buffer1_len, + __u8 ⋆ buffer2, + size_t buffer2_len, + dmx_section_filter_t ⋆ source, + dmx_success_t success); + + typedef int (⋆dmx_pes_cb) ( __u8 ⋆ buffer1, + size_t buffer1_len, + __u8 ⋆ buffer2, + size_t buffer2_len, + dmx_pes_filter_t⋆ source, + dmx_success_t success); + + /⋆--------------------------------------------------------------------------⋆/ + /⋆ DVB Front-End ⋆/ + /⋆--------------------------------------------------------------------------⋆/ + + typedef enum { + DMX_OTHER_FE = 0, + DMX_SATELLITE_FE, + DMX_CABLE_FE, + DMX_TERRESTRIAL_FE, + DMX_LVDS_FE, + DMX_ASI_FE, /⋆ DVB-ASI interface ⋆/ + DMX_MEMORY_FE + } dmx_frontend_source_t; + + typedef struct { + /⋆ The following char⋆ fields point to NULL terminated strings ⋆/ + char⋆ id; /⋆ Unique front-end identifier ⋆/ + char⋆ vendor; /⋆ Name of the front-end vendor ⋆/ + char⋆ model; /⋆ Name of the front-end model ⋆/ + struct list_head connectivity_list; /⋆ List of front-ends that can + be connected to a particular + demux ⋆/ + void⋆ priv; /⋆ Pointer to private data of the API client ⋆/ + dmx_frontend_source_t source; + } dmx_frontend_t; + + /⋆--------------------------------------------------------------------------⋆/ + /⋆ MPEG-2 TS Demux ⋆/ + /⋆--------------------------------------------------------------------------⋆/ + + /⋆ + ⋆ Flags OR'ed in the capabilites field of struct dmx_demux_s. + ⋆/ + + #define DMX_TS_FILTERING 1 + #define DMX_PES_FILTERING 2 + #define DMX_SECTION_FILTERING 4 + #define DMX_MEMORY_BASED_FILTERING 8 /⋆ write() available ⋆/ + #define DMX_CRC_CHECKING 16 + #define DMX_TS_DESCRAMBLING 32 + #define DMX_SECTION_PAYLOAD_DESCRAMBLING 64 + #define DMX_MAC_ADDRESS_DESCRAMBLING 128 +</programlisting> + +</section> +<section id="demux_demux_t"> +<title>demux_demux_t</title> + <programlisting> + /⋆ + ⋆ DMX_FE_ENTRY(): Casts elements in the list of registered + ⋆ front-ends from the generic type struct list_head + ⋆ to the type ⋆ dmx_frontend_t + ⋆. + ⋆/ + + #define DMX_FE_ENTRY(list) list_entry(list, dmx_frontend_t, connectivity_list) + + struct dmx_demux_s { + /⋆ The following char⋆ fields point to NULL terminated strings ⋆/ + char⋆ id; /⋆ Unique demux identifier ⋆/ + char⋆ vendor; /⋆ Name of the demux vendor ⋆/ + char⋆ model; /⋆ Name of the demux model ⋆/ + __u32 capabilities; /⋆ Bitfield of capability flags ⋆/ + dmx_frontend_t⋆ frontend; /⋆ Front-end connected to the demux ⋆/ + struct list_head reg_list; /⋆ List of registered demuxes ⋆/ + void⋆ priv; /⋆ Pointer to private data of the API client ⋆/ + int users; /⋆ Number of users ⋆/ + int (⋆open) (struct dmx_demux_s⋆ demux); + int (⋆close) (struct dmx_demux_s⋆ demux); + int (⋆write) (struct dmx_demux_s⋆ demux, const char⋆ buf, size_t count); + int (⋆allocate_ts_feed) (struct dmx_demux_s⋆ demux, + dmx_ts_feed_t⋆⋆ feed, + dmx_ts_cb callback); + int (⋆release_ts_feed) (struct dmx_demux_s⋆ demux, + dmx_ts_feed_t⋆ feed); + int (⋆allocate_pes_feed) (struct dmx_demux_s⋆ demux, + dmx_pes_feed_t⋆⋆ feed, + dmx_pes_cb callback); + int (⋆release_pes_feed) (struct dmx_demux_s⋆ demux, + dmx_pes_feed_t⋆ feed); + int (⋆allocate_section_feed) (struct dmx_demux_s⋆ demux, + dmx_section_feed_t⋆⋆ feed, + dmx_section_cb callback); + int (⋆release_section_feed) (struct dmx_demux_s⋆ demux, + dmx_section_feed_t⋆ feed); + int (⋆descramble_mac_address) (struct dmx_demux_s⋆ demux, + __u8⋆ buffer1, + size_t buffer1_length, + __u8⋆ buffer2, + size_t buffer2_length, + __u16 pid); + int (⋆descramble_section_payload) (struct dmx_demux_s⋆ demux, + __u8⋆ buffer1, + size_t buffer1_length, + __u8⋆ buffer2, size_t buffer2_length, + __u16 pid); + int (⋆add_frontend) (struct dmx_demux_s⋆ demux, + dmx_frontend_t⋆ frontend); + int (⋆remove_frontend) (struct dmx_demux_s⋆ demux, + dmx_frontend_t⋆ frontend); + struct list_head⋆ (⋆get_frontends) (struct dmx_demux_s⋆ demux); + int (⋆connect_frontend) (struct dmx_demux_s⋆ demux, + dmx_frontend_t⋆ frontend); + int (⋆disconnect_frontend) (struct dmx_demux_s⋆ demux); + + + /⋆ added because js cannot keep track of these himself ⋆/ + int (⋆get_pes_pids) (struct dmx_demux_s⋆ demux, __u16 ⋆pids); + }; + typedef struct dmx_demux_s dmx_demux_t; +</programlisting> + +</section> +<section id="demux_directory"> +<title>Demux directory</title> + <programlisting> + /⋆ + ⋆ DMX_DIR_ENTRY(): Casts elements in the list of registered + ⋆ demuxes from the generic type struct list_head⋆ to the type dmx_demux_t + ⋆. + ⋆/ + + #define DMX_DIR_ENTRY(list) list_entry(list, dmx_demux_t, reg_list) + + int dmx_register_demux (dmx_demux_t⋆ demux); + int dmx_unregister_demux (dmx_demux_t⋆ demux); + struct list_head⋆ dmx_get_demuxes (void); +</programlisting> + </section></section> +<section id="demux_directory_api"> +<title>Demux Directory API</title> +<para>The demux directory is a Linux kernel-wide facility for registering and accessing the +MPEG-2 TS demuxes in the system. Run-time registering and unregistering of demux drivers +is possible using this API. +</para> +<para>All demux drivers in the directory implement the abstract interface dmx_demux_t. +</para> + +<section +role="subsection"><title>dmx_register_demux()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This function makes a demux driver interface available to the Linux kernel. It is + usually called by the init_module() function of the kernel module that contains + the demux driver. The caller of this function is responsible for allocating + dynamic or static memory for the demux structure and for initializing its fields + before calling this function. The memory allocated for the demux structure + must not be freed before calling dmx_unregister_demux(),</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int dmx_register_demux ( dmx_demux_t ⋆demux )</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>dmx_demux_t* + demux</para> +</entry><entry + align="char"> +<para>Pointer to the demux structure.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURNS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>0</para> +</entry><entry + align="char"> +<para>The function was completed without errors.</para> +</entry> + </row><row><entry + align="char"> +<para>-EEXIST</para> +</entry><entry + align="char"> +<para>A demux with the same value of the id field already stored + in the directory.</para> +</entry> + </row><row><entry + align="char"> +<para>-ENOSPC</para> +</entry><entry + align="char"> +<para>No space left in the directory.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section +role="subsection"><title>dmx_unregister_demux()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This function is called to indicate that the given demux interface is no + longer available. The caller of this function is responsible for freeing the + memory of the demux structure, if it was dynamically allocated before calling + dmx_register_demux(). The cleanup_module() function of the kernel module + that contains the demux driver should call this function. Note that this function + fails if the demux is currently in use, i.e., release_demux() has not been called + for the interface.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int dmx_unregister_demux ( dmx_demux_t ⋆demux )</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>dmx_demux_t* + demux</para> +</entry><entry + align="char"> +<para>Pointer to the demux structure which is to be + unregistered.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURNS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>0</para> +</entry><entry + align="char"> +<para>The function was completed without errors.</para> +</entry> + </row><row><entry + align="char"> +<para>ENODEV</para> +</entry><entry + align="char"> +<para>The specified demux is not registered in the demux + directory.</para> +</entry> + </row><row><entry + align="char"> +<para>EBUSY</para> +</entry><entry + align="char"> +<para>The specified demux is currently in use.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section +role="subsection"><title>dmx_get_demuxes()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>Provides the caller with the list of registered demux interfaces, using the + standard list structure defined in the include file linux/list.h. The include file + demux.h defines the macro DMX_DIR_ENTRY() for converting an element of + the generic type struct list_head* to the type dmx_demux_t*. The caller must + not free the memory of any of the elements obtained via this function call.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>struct list_head ⋆dmx_get_demuxes ()</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>none</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURNS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>struct list_head *</para> +</entry><entry + align="char"> +<para>A list of demux interfaces, or NULL in the case of an + empty list.</para> +</entry> + </row></tbody></tgroup></informaltable> + </section></section> +<section id="demux_api"> +<title>Demux API</title> +<para>The demux API should be implemented for each demux in the system. It is used to select +the TS source of a demux and to manage the demux resources. When the demux +client allocates a resource via the demux API, it receives a pointer to the API of that +resource. +</para> +<para>Each demux receives its TS input from a DVB front-end or from memory, as set via the +demux API. In a system with more than one front-end, the API can be used to select one of +the DVB front-ends as a TS source for a demux, unless this is fixed in the HW platform. The +demux API only controls front-ends regarding their connections with demuxes; the APIs +used to set the other front-end parameters, such as tuning, are not defined in this +document. +</para> +<para>The functions that implement the abstract interface demux should be defined static or +module private and registered to the Demux Directory for external access. It is not necessary +to implement every function in the demux_t struct, however (for example, a demux interface +might support Section filtering, but not TS or PES filtering). The API client is expected to +check the value of any function pointer before calling the function: the value of NULL means +“function not available”. +</para> +<para>Whenever the functions of the demux API modify shared data, the possibilities of lost +update and race condition problems should be addressed, e.g. by protecting parts of code with +mutexes. This is especially important on multi-processor hosts. +</para> +<para>Note that functions called from a bottom half context must not sleep, at least in the 2.2.x +kernels. Even a simple memory allocation can result in a kernel thread being put to sleep if +swapping is needed. For example, the Linux kernel calls the functions of a network device +interface from a bottom half context. Thus, if a demux API function is called from network +device code, the function must not sleep. +</para> + + +<section id="kdapi_fopen"> +<title>open()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This function reserves the demux for use by the caller and, if necessary, + initializes the demux. When the demux is no longer needed, the function close() + should be called. It should be possible for multiple clients to access the demux + at the same time. Thus, the function implementation should increment the + demux usage count when open() is called and decrement it when close() is + called.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int open ( demux_t⋆ demux );</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>demux_t* demux</para> +</entry><entry + align="char"> +<para>Pointer to the demux API and instance data.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURNS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>0</para> +</entry><entry + align="char"> +<para>The function was completed without errors.</para> +</entry> + </row><row><entry + align="char"> +<para>-EUSERS</para> +</entry><entry + align="char"> +<para>Maximum usage count reached.</para> +</entry> + </row><row><entry + align="char"> +<para>-EINVAL</para> +</entry><entry + align="char"> +<para>Bad parameter.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section> +<section id="kdapi_fclose"> +<title>close()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This function reserves the demux for use by the caller and, if necessary, + initializes the demux. When the demux is no longer needed, the function close() + should be called. It should be possible for multiple clients to access the demux + at the same time. Thus, the function implementation should increment the + demux usage count when open() is called and decrement it when close() is + called.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int close(demux_t⋆ demux);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>demux_t* demux</para> +</entry><entry + align="char"> +<para>Pointer to the demux API and instance data.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURNS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>0</para> +</entry><entry + align="char"> +<para>The function was completed without errors.</para> +</entry> + </row><row><entry + align="char"> +<para>-ENODEV</para> +</entry><entry + align="char"> +<para>The demux was not in use.</para> +</entry> + </row><row><entry + align="char"> +<para>-EINVAL</para> +</entry><entry + align="char"> +<para>Bad parameter.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section> +<section id="kdapi_fwrite"> +<title>write()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This function provides the demux driver with a memory buffer containing TS + packets. Instead of receiving TS packets from the DVB front-end, the demux + driver software will read packets from memory. Any clients of this demux + with active TS, PES or Section filters will receive filtered data via the Demux + callback API (see 0). The function returns when all the data in the buffer has + been consumed by the demux. Demux hardware typically cannot read TS from + memory. If this is the case, memory-based filtering has to be implemented + entirely in software.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int write(demux_t⋆ demux, const char⋆ buf, size_t + count);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>demux_t* demux</para> +</entry><entry + align="char"> +<para>Pointer to the demux API and instance data.</para> +</entry> + </row><row><entry + align="char"> +<para>const char* buf</para> +</entry><entry + align="char"> +<para>Pointer to the TS data in kernel-space memory.</para> +</entry> + </row><row><entry + align="char"> +<para>size_t length</para> +</entry><entry + align="char"> +<para>Length of the TS data.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURNS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>0</para> +</entry><entry + align="char"> +<para>The function was completed without errors.</para> +</entry> + </row><row><entry + align="char"> +<para>-ENOSYS</para> +</entry><entry + align="char"> +<para>The command is not implemented.</para> +</entry> + </row><row><entry + align="char"> +<para>-EINVAL</para> +</entry><entry + align="char"> +<para>Bad parameter.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section +role="subsection"><title>allocate_ts_feed()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>Allocates a new TS feed, which is used to filter the TS packets carrying a + certain PID. The TS feed normally corresponds to a hardware PID filter on the + demux chip.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int allocate_ts_feed(dmx_demux_t⋆ demux, + dmx_ts_feed_t⋆⋆ feed, dmx_ts_cb callback);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>demux_t* demux</para> +</entry><entry + align="char"> +<para>Pointer to the demux API and instance data.</para> +</entry> + </row><row><entry + align="char"> +<para>dmx_ts_feed_t** + feed</para> +</entry><entry + align="char"> +<para>Pointer to the TS feed API and instance data.</para> +</entry> + </row><row><entry + align="char"> +<para>dmx_ts_cb callback</para> +</entry><entry + align="char"> +<para>Pointer to the callback function for passing received TS + packet</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURNS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>0</para> +</entry><entry + align="char"> +<para>The function was completed without errors.</para> +</entry> + </row><row><entry + align="char"> +<para>-EBUSY</para> +</entry><entry + align="char"> +<para>No more TS feeds available.</para> +</entry> + </row><row><entry + align="char"> +<para>-ENOSYS</para> +</entry><entry + align="char"> +<para>The command is not implemented.</para> +</entry> + </row><row><entry + align="char"> +<para>-EINVAL</para> +</entry><entry + align="char"> +<para>Bad parameter.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section +role="subsection"><title>release_ts_feed()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>Releases the resources allocated with allocate_ts_feed(). Any filtering in + progress on the TS feed should be stopped before calling this function.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int release_ts_feed(dmx_demux_t⋆ demux, + dmx_ts_feed_t⋆ feed);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>demux_t* demux</para> +</entry><entry + align="char"> +<para>Pointer to the demux API and instance data.</para> +</entry> + </row><row><entry + align="char"> +<para>dmx_ts_feed_t* feed</para> +</entry><entry + align="char"> +<para>Pointer to the TS feed API and instance data.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURNS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>0</para> +</entry><entry + align="char"> +<para>The function was completed without errors.</para> +</entry> + </row><row><entry + align="char"> +<para>-EINVAL</para> +</entry><entry + align="char"> +<para>Bad parameter.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section +role="subsection"><title>allocate_section_feed()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>Allocates a new section feed, i.e. a demux resource for filtering and receiving + sections. On platforms with hardware support for section filtering, a section + feed is directly mapped to the demux HW. On other platforms, TS packets are + first PID filtered in hardware and a hardware section filter then emulated in + software. The caller obtains an API pointer of type dmx_section_feed_t as an + out parameter. Using this API the caller can set filtering parameters and start + receiving sections.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int allocate_section_feed(dmx_demux_t⋆ demux, + dmx_section_feed_t ⋆⋆feed, dmx_section_cb callback);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>demux_t *demux</para> +</entry><entry + align="char"> +<para>Pointer to the demux API and instance data.</para> +</entry> + </row><row><entry + align="char"> +<para>dmx_section_feed_t + **feed</para> +</entry><entry + align="char"> +<para>Pointer to the section feed API and instance data.</para> +</entry> + </row><row><entry + align="char"> +<para>dmx_section_cb + callback</para> +</entry><entry + align="char"> +<para>Pointer to the callback function for passing received + sections.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURNS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>0</para> +</entry><entry + align="char"> +<para>The function was completed without errors.</para> +</entry> + </row><row><entry + align="char"> +<para>-EBUSY</para> +</entry><entry + align="char"> +<para>No more section feeds available.</para> +</entry> + </row><row><entry + align="char"> +<para>-ENOSYS</para> +</entry><entry + align="char"> +<para>The command is not implemented.</para> +</entry> + </row><row><entry + align="char"> +<para>-EINVAL</para> +</entry><entry + align="char"> +<para>Bad parameter.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section +role="subsection"><title>release_section_feed()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>Releases the resources allocated with allocate_section_feed(), including + allocated filters. Any filtering in progress on the section feed should be stopped + before calling this function.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int release_section_feed(dmx_demux_t⋆ demux, + dmx_section_feed_t ⋆feed);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>demux_t *demux</para> +</entry><entry + align="char"> +<para>Pointer to the demux API and instance data.</para> +</entry> + </row><row><entry + align="char"> +<para>dmx_section_feed_t + *feed</para> +</entry><entry + align="char"> +<para>Pointer to the section feed API and instance data.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURNS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>0</para> +</entry><entry + align="char"> +<para>The function was completed without errors.</para> +</entry> + </row><row><entry + align="char"> +<para>-EINVAL</para> +</entry><entry + align="char"> +<para>Bad parameter.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section +role="subsection"><title>descramble_mac_address()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This function runs a descrambling algorithm on the destination MAC + address field of a DVB Datagram Section, replacing the original address + with its un-encrypted version. Otherwise, the description on the function + descramble_section_payload() applies also to this function.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int descramble_mac_address(dmx_demux_t⋆ demux, __u8 + ⋆buffer1, size_t buffer1_length, __u8 ⋆buffer2, + size_t buffer2_length, __u16 pid);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>dmx_demux_t + *demux</para> +</entry><entry + align="char"> +<para>Pointer to the demux API and instance data.</para> +</entry> + </row><row><entry + align="char"> +<para>__u8 *buffer1</para> +</entry><entry + align="char"> +<para>Pointer to the first byte of the section.</para> +</entry> + </row><row><entry + align="char"> +<para>size_t buffer1_length</para> +</entry><entry + align="char"> +<para>Length of the section data, including headers and CRC, + in buffer1.</para> +</entry> + </row><row><entry + align="char"> +<para>__u8* buffer2</para> +</entry><entry + align="char"> +<para>Pointer to the tail of the section data, or NULL. The + pointer has a non-NULL value if the section wraps past + the end of a circular buffer.</para> +</entry> + </row><row><entry + align="char"> +<para>size_t buffer2_length</para> +</entry><entry + align="char"> +<para>Length of the section data, including headers and CRC, + in buffer2.</para> +</entry> + </row><row><entry + align="char"> +<para>__u16 pid</para> +</entry><entry + align="char"> +<para>The PID on which the section was received. Useful + for obtaining the descrambling key, e.g. from a DVB + Common Access facility.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURNS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>0</para> +</entry><entry + align="char"> +<para>The function was completed without errors.</para> +</entry> + </row><row><entry + align="char"> +<para>-ENOSYS</para> +</entry><entry + align="char"> +<para>No descrambling facility available.</para> +</entry> + </row><row><entry + align="char"> +<para>-EINVAL</para> +</entry><entry + align="char"> +<para>Bad parameter.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section +role="subsection"><title>descramble_section_payload()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This function runs a descrambling algorithm on the payload of a DVB + Datagram Section, replacing the original payload with its un-encrypted + version. The function will be called from the demux API implementation; + the API client need not call this function directly. Section-level scrambling + algorithms are currently standardized only for DVB-RCC (return channel + over 2-directional cable TV network) systems. For all other DVB networks, + encryption schemes are likely to be proprietary to each data broadcaster. Thus, + it is expected that this function pointer will have the value of NULL (i.e., + function not available) in most demux API implementations. Nevertheless, it + should be possible to use the function pointer as a hook for dynamically adding + a “plug-in” descrambling facility to a demux driver.</para> +</entry> + </row><row><entry + align="char"> +<para>While this function is not needed with hardware-based section descrambling, + the descramble_section_payload function pointer can be used to override the + default hardware-based descrambling algorithm: if the function pointer has a + non-NULL value, the corresponding function should be used instead of any + descrambling hardware.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int descramble_section_payload(dmx_demux_t⋆ demux, + __u8 ⋆buffer1, size_t buffer1_length, __u8 ⋆buffer2, + size_t buffer2_length, __u16 pid);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>dmx_demux_t + *demux</para> +</entry><entry + align="char"> +<para>Pointer to the demux API and instance data.</para> +</entry> + </row><row><entry + align="char"> +<para>__u8 *buffer1</para> +</entry><entry + align="char"> +<para>Pointer to the first byte of the section.</para> +</entry> + </row><row><entry + align="char"> +<para>size_t buffer1_length</para> +</entry><entry + align="char"> +<para>Length of the section data, including headers and CRC, + in buffer1.</para> +</entry> + </row><row><entry + align="char"> +<para>__u8 *buffer2</para> +</entry><entry + align="char"> +<para>Pointer to the tail of the section data, or NULL. The + pointer has a non-NULL value if the section wraps past + the end of a circular buffer.</para> +</entry> + </row><row><entry + align="char"> +<para>size_t buffer2_length</para> +</entry><entry + align="char"> +<para>Length of the section data, including headers and CRC, + in buffer2.</para> +</entry> + </row><row><entry + align="char"> +<para>__u16 pid</para> +</entry><entry + align="char"> +<para>The PID on which the section was received. Useful + for obtaining the descrambling key, e.g. from a DVB + Common Access facility.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURNS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>0</para> +</entry><entry + align="char"> +<para>The function was completed without errors.</para> +</entry> + </row><row><entry + align="char"> +<para>-ENOSYS</para> +</entry><entry + align="char"> +<para>No descrambling facility available.</para> +</entry> + </row><row><entry + align="char"> +<para>-EINVAL</para> +</entry><entry + align="char"> +<para>Bad parameter.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section +role="subsection"><title>add_frontend()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>Registers a connectivity between a demux and a front-end, i.e., indicates that + the demux can be connected via a call to connect_frontend() to use the given + front-end as a TS source. The client of this function has to allocate dynamic or + static memory for the frontend structure and initialize its fields before calling + this function. This function is normally called during the driver initialization. + The caller must not free the memory of the frontend struct before successfully + calling remove_frontend().</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int add_frontend(dmx_demux_t ⋆demux, dmx_frontend_t + ⋆frontend);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>dmx_demux_t* + demux</para> +</entry><entry + align="char"> +<para>Pointer to the demux API and instance data.</para> +</entry> + </row><row><entry + align="char"> +<para>dmx_frontend_t* + frontend</para> +</entry><entry + align="char"> +<para>Pointer to the front-end instance data.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURNS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>0</para> +</entry><entry + align="char"> +<para>The function was completed without errors.</para> +</entry> + </row><row><entry + align="char"> +<para>-EEXIST</para> +</entry><entry + align="char"> +<para>A front-end with the same value of the id field already + registered.</para> +</entry> + </row><row><entry + align="char"> +<para>-EINUSE</para> +</entry><entry + align="char"> +<para>The demux is in use.</para> +</entry> + </row><row><entry + align="char"> +<para>-ENOMEM</para> +</entry><entry + align="char"> +<para>No more front-ends can be added.</para> +</entry> + </row><row><entry + align="char"> +<para>-EINVAL</para> +</entry><entry + align="char"> +<para>Bad parameter.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section +role="subsection"><title>remove_frontend()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>Indicates that the given front-end, registered by a call to add_frontend(), can + no longer be connected as a TS source by this demux. The function should be + called when a front-end driver or a demux driver is removed from the system. + If the front-end is in use, the function fails with the return value of -EBUSY. + After successfully calling this function, the caller can free the memory of + the frontend struct if it was dynamically allocated before the add_frontend() + operation.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int remove_frontend(dmx_demux_t⋆ demux, + dmx_frontend_t⋆ frontend);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>dmx_demux_t* + demux</para> +</entry><entry + align="char"> +<para>Pointer to the demux API and instance data.</para> +</entry> + </row><row><entry + align="char"> +<para>dmx_frontend_t* + frontend</para> +</entry><entry + align="char"> +<para>Pointer to the front-end instance data.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURNS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>0</para> +</entry><entry + align="char"> +<para>The function was completed without errors.</para> +</entry> + </row><row><entry + align="char"> +<para>-EINVAL</para> +</entry><entry + align="char"> +<para>Bad parameter.</para> +</entry> + </row><row><entry + align="char"> +<para>-EBUSY</para> +</entry><entry + align="char"> +<para>The front-end is in use, i.e. a call to connect_frontend() + has not been followed by a call to disconnect_frontend().</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section +role="subsection"><title>get_frontends()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>Provides the APIs of the front-ends that have been registered for this demux. + Any of the front-ends obtained with this call can be used as a parameter for + connect_frontend().</para> +</entry> + </row><row><entry + align="char"> +<para>The include file demux.h contains the macro DMX_FE_ENTRY() for + converting an element of the generic type struct list_head* to the type + dmx_frontend_t*. The caller must not free the memory of any of the elements + obtained via this function call.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>struct list_head⋆ get_frontends(dmx_demux_t⋆ demux);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>dmx_demux_t* + demux</para> +</entry><entry + align="char"> +<para>Pointer to the demux API and instance data.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURNS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>dmx_demux_t*</para> +</entry><entry + align="char"> +<para>A list of front-end interfaces, or NULL in the case of an + empty list.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section +role="subsection"><title>connect_frontend()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>Connects the TS output of the front-end to the input of the demux. A demux + can only be connected to a front-end registered to the demux with the function + add_frontend().</para> +</entry> + </row><row><entry + align="char"> +<para>It may or may not be possible to connect multiple demuxes to the same + front-end, depending on the capabilities of the HW platform. When not used, + the front-end should be released by calling disconnect_frontend().</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int connect_frontend(dmx_demux_t⋆ demux, + dmx_frontend_t⋆ frontend);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>dmx_demux_t* + demux</para> +</entry><entry + align="char"> +<para>Pointer to the demux API and instance data.</para> +</entry> + </row><row><entry + align="char"> +<para>dmx_frontend_t* + frontend</para> +</entry><entry + align="char"> +<para>Pointer to the front-end instance data.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURNS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>0</para> +</entry><entry + align="char"> +<para>The function was completed without errors.</para> +</entry> + </row><row><entry + align="char"> +<para>-EINVAL</para> +</entry><entry + align="char"> +<para>Bad parameter.</para> +</entry> + </row><row><entry + align="char"> +<para>-EBUSY</para> +</entry><entry + align="char"> +<para>The front-end is in use.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section +role="subsection"><title>disconnect_frontend()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>Disconnects the demux and a front-end previously connected by a + connect_frontend() call.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int disconnect_frontend(dmx_demux_t⋆ demux);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>dmx_demux_t* + demux</para> +</entry><entry + align="char"> +<para>Pointer to the demux API and instance data.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURNS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>0</para> +</entry><entry + align="char"> +<para>The function was completed without errors.</para> +</entry> + </row><row><entry + align="char"> +<para>-EINVAL</para> +</entry><entry + align="char"> +<para>Bad parameter.</para> +</entry> + </row></tbody></tgroup></informaltable> + </section></section> +<section id="demux_callback_api"> +<title>Demux Callback API</title> +<para>This kernel-space API comprises the callback functions that deliver filtered data to the +demux client. Unlike the other APIs, these API functions are provided by the client and called +from the demux code. +</para> +<para>The function pointers of this abstract interface are not packed into a structure as in the +other demux APIs, because the callback functions are registered and used independent +of each other. As an example, it is possible for the API client to provide several +callback functions for receiving TS packets and no callbacks for PES packets or +sections. +</para> +<para>The functions that implement the callback API need not be re-entrant: when a demux +driver calls one of these functions, the driver is not allowed to call the function again before +the original call returns. If a callback is triggered by a hardware interrupt, it is recommended +to use the Linux “bottom half” mechanism or start a tasklet instead of making the callback +function call directly from a hardware interrupt. +</para> + +<section +role="subsection"><title>dmx_ts_cb()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This function, provided by the client of the demux API, is called from the + demux code. The function is only called when filtering on this TS feed has + been enabled using the start_filtering() function.</para> +</entry> + </row><row><entry + align="char"> +<para>Any TS packets that match the filter settings are copied to a circular buffer. The + filtered TS packets are delivered to the client using this callback function. The + size of the circular buffer is controlled by the circular_buffer_size parameter + of the set() function in the TS Feed API. It is expected that the buffer1 and + buffer2 callback parameters point to addresses within the circular buffer, but + other implementations are also possible. Note that the called party should not + try to free the memory the buffer1 and buffer2 parameters point to.</para> +</entry> + </row><row><entry + align="char"> +<para>When this function is called, the buffer1 parameter typically points to the + start of the first undelivered TS packet within a circular buffer. The buffer2 + buffer parameter is normally NULL, except when the received TS packets have + crossed the last address of the circular buffer and ”wrapped” to the beginning + of the buffer. In the latter case the buffer1 parameter would contain an address + within the circular buffer, while the buffer2 parameter would contain the first + address of the circular buffer.</para> +</entry> + </row><row><entry + align="char"> +<para>The number of bytes delivered with this function (i.e. buffer1_length + + buffer2_length) is usually equal to the value of callback_length parameter + given in the set() function, with one exception: if a timeout occurs before + receiving callback_length bytes of TS data, any undelivered packets are + immediately delivered to the client by calling this function. The timeout + duration is controlled by the set() function in the TS Feed API.</para> +</entry> + </row><row><entry + align="char"> +<para>If a TS packet is received with errors that could not be fixed by the TS-level + forward error correction (FEC), the Transport_error_indicator flag of the TS + packet header should be set. The TS packet should not be discarded, as + the error can possibly be corrected by a higher layer protocol. If the called + party is slow in processing the callback, it is possible that the circular buffer + eventually fills up. If this happens, the demux driver should discard any TS + packets received while the buffer is full. The error should be indicated to the + client on the next callback by setting the success parameter to the value of + DMX_OVERRUN_ERROR.</para> +</entry> + </row><row><entry + align="char"> +<para>The type of data returned to the callback can be selected by the new + function int (*set_type) (struct dmx_ts_feed_s* feed, int type, dmx_ts_pes_t + pes_type) which is part of the dmx_ts_feed_s struct (also cf. to the + include file ost/demux.h) The type parameter decides if the raw TS packet + (TS_PACKET) or just the payload (TS_PACKET—TS_PAYLOAD_ONLY) + should be returned. If additionally the TS_DECODER bit is set the stream + will also be sent to the hardware MPEG decoder. In this case, the second + flag decides as what kind of data the stream should be interpreted. The + possible choices are one of DMX_TS_PES_AUDIO, DMX_TS_PES_VIDEO, + DMX_TS_PES_TELETEXT, DMX_TS_PES_SUBTITLE, + DMX_TS_PES_PCR, or DMX_TS_PES_OTHER.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int dmx_ts_cb(__u8⋆ buffer1, size_t buffer1_length, + __u8⋆ buffer2, size_t buffer2_length, dmx_ts_feed_t⋆ + source, dmx_success_t success);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>__u8* buffer1</para> +</entry><entry + align="char"> +<para>Pointer to the start of the filtered TS packets.</para> +</entry> + </row><row><entry + align="char"> +<para>size_t buffer1_length</para> +</entry><entry + align="char"> +<para>Length of the TS data in buffer1.</para> +</entry> + </row><row><entry + align="char"> +<para>__u8* buffer2</para> +</entry><entry + align="char"> +<para>Pointer to the tail of the filtered TS packets, or NULL.</para> +</entry> + </row><row><entry + align="char"> +<para>size_t buffer2_length</para> +</entry><entry + align="char"> +<para>Length of the TS data in buffer2.</para> +</entry> + </row><row><entry + align="char"> +<para>dmx_ts_feed_t* + source</para> +</entry><entry + align="char"> +<para>Indicates which TS feed is the source of the callback.</para> +</entry> + </row><row><entry + align="char"> +<para>dmx_success_t + success</para> +</entry><entry + align="char"> +<para>Indicates if there was an error in TS reception.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURNS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>0</para> +</entry><entry + align="char"> +<para>Continue filtering.</para> +</entry> + </row><row><entry + align="char"> +<para>-1</para> +</entry><entry + align="char"> +<para>Stop filtering - has the same effect as a call to + stop_filtering() on the TS Feed API.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section +role="subsection"><title>dmx_section_cb()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This function, provided by the client of the demux API, is called from the + demux code. The function is only called when filtering of sections has been + enabled using the function start_filtering() of the section feed API. When the + demux driver has received a complete section that matches at least one section + filter, the client is notified via this callback function. Normally this function is + called for each received section; however, it is also possible to deliver multiple + sections with one callback, for example when the system load is high. If an + error occurs while receiving a section, this function should be called with + the corresponding error type set in the success field, whether or not there is + data to deliver. The Section Feed implementation should maintain a circular + buffer for received sections. However, this is not necessary if the Section Feed + API is implemented as a client of the TS Feed API, because the TS Feed + implementation then buffers the received data. The size of the circular buffer + can be configured using the set() function in the Section Feed API. If there + is no room in the circular buffer when a new section is received, the section + must be discarded. If this happens, the value of the success parameter should + be DMX_OVERRUN_ERROR on the next callback.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int dmx_section_cb(__u8⋆ buffer1, size_t + buffer1_length, __u8⋆ buffer2, size_t + buffer2_length, dmx_section_filter_t⋆ source, + dmx_success_t success);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>__u8* buffer1</para> +</entry><entry + align="char"> +<para>Pointer to the start of the filtered section, e.g. within the + circular buffer of the demux driver.</para> +</entry> + </row><row><entry + align="char"> +<para>size_t buffer1_length</para> +</entry><entry + align="char"> +<para>Length of the filtered section data in buffer1, including + headers and CRC.</para> +</entry> + </row><row><entry + align="char"> +<para>__u8* buffer2</para> +</entry><entry + align="char"> +<para>Pointer to the tail of the filtered section data, or NULL. + Useful to handle the wrapping of a circular buffer.</para> +</entry> + </row><row><entry + align="char"> +<para>size_t buffer2_length</para> +</entry><entry + align="char"> +<para>Length of the filtered section data in buffer2, including + headers and CRC.</para> +</entry> + </row><row><entry + align="char"> +<para>dmx_section_filter_t* + filter</para> +</entry><entry + align="char"> +<para>Indicates the filter that triggered the callback.</para> +</entry> + </row><row><entry + align="char"> +<para>dmx_success_t + success</para> +</entry><entry + align="char"> +<para>Indicates if there was an error in section reception.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURNS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>0</para> +</entry><entry + align="char"> +<para>Continue filtering.</para> +</entry> + </row><row><entry + align="char"> +<para>-1</para> +</entry><entry + align="char"> +<para>Stop filtering - has the same effect as a call to + stop_filtering() on the Section Feed API.</para> +</entry> + </row></tbody></tgroup></informaltable> + </section></section> +<section id="ts_feed_api"> +<title>TS Feed API</title> +<para>A TS feed is typically mapped to a hardware PID filter on the demux chip. +Using this API, the client can set the filtering properties to start/stop filtering TS +packets on a particular TS feed. The API is defined as an abstract interface of the type +dmx_ts_feed_t. +</para> +<para>The functions that implement the interface should be defined static or module private. The +client can get the handle of a TS feed API by calling the function allocate_ts_feed() in the +demux API. +</para> + +<section +role="subsection"><title>set()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This function sets the parameters of a TS feed. Any filtering in progress on the + TS feed must be stopped before calling this function.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int set ( dmx_ts_feed_t⋆ feed, __u16 pid, size_t + callback_length, size_t circular_buffer_size, int + descramble, struct timespec timeout);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>dmx_ts_feed_t* feed</para> +</entry><entry + align="char"> +<para>Pointer to the TS feed API and instance data.</para> +</entry> + </row><row><entry + align="char"> +<para>__u16 pid</para> +</entry><entry + align="char"> +<para>PID value to filter. Only the TS packets carrying the + specified PID will be passed to the API client.</para> +</entry> + </row><row><entry + align="char"> +<para>size_t + callback_length</para> +</entry><entry + align="char"> +<para>Number of bytes to deliver with each call to the + dmx_ts_cb() callback function. The value of this + parameter should be a multiple of 188.</para> +</entry> + </row><row><entry + align="char"> +<para>size_t + circular_buffer_size</para> +</entry><entry + align="char"> +<para>Size of the circular buffer for the filtered TS packets.</para> +</entry> + </row><row><entry + align="char"> +<para>int descramble</para> +</entry><entry + align="char"> +<para>If non-zero, descramble the filtered TS packets.</para> +</entry> + </row><row><entry + align="char"> +<para>struct timespec + timeout</para> +</entry><entry + align="char"> +<para>Maximum time to wait before delivering received TS + packets to the client.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURNS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>0</para> +</entry><entry + align="char"> +<para>The function was completed without errors.</para> +</entry> + </row><row><entry + align="char"> +<para>-ENOMEM</para> +</entry><entry + align="char"> +<para>Not enough memory for the requested buffer size.</para> +</entry> + </row><row><entry + align="char"> +<para>-ENOSYS</para> +</entry><entry + align="char"> +<para>No descrambling facility available for TS.</para> +</entry> + </row><row><entry + align="char"> +<para>-EINVAL</para> +</entry><entry + align="char"> +<para>Bad parameter.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section +role="subsection"><title>start_filtering()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>Starts filtering TS packets on this TS feed, according to its settings. The PID + value to filter can be set by the API client. All matching TS packets are + delivered asynchronously to the client, using the callback function registered + with allocate_ts_feed().</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int start_filtering(dmx_ts_feed_t⋆ feed);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>dmx_ts_feed_t* feed</para> +</entry><entry + align="char"> +<para>Pointer to the TS feed API and instance data.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURNS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>0</para> +</entry><entry + align="char"> +<para>The function was completed without errors.</para> +</entry> + </row><row><entry + align="char"> +<para>-EINVAL</para> +</entry><entry + align="char"> +<para>Bad parameter.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section +role="subsection"><title>stop_filtering()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>Stops filtering TS packets on this TS feed.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int stop_filtering(dmx_ts_feed_t⋆ feed);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>dmx_ts_feed_t* feed</para> +</entry><entry + align="char"> +<para>Pointer to the TS feed API and instance data.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURNS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>0</para> +</entry><entry + align="char"> +<para>The function was completed without errors.</para> +</entry> + </row><row><entry + align="char"> +<para>-EINVAL</para> +</entry><entry + align="char"> +<para>Bad parameter.</para> +</entry> + </row></tbody></tgroup></informaltable> + </section></section> +<section id="section_feed_api"> +<title>Section Feed API</title> +<para>A section feed is a resource consisting of a PID filter and a set of section filters. Using this +API, the client can set the properties of a section feed and to start/stop filtering. The API is +defined as an abstract interface of the type dmx_section_feed_t. The functions that implement +the interface should be defined static or module private. The client can get the handle of +a section feed API by calling the function allocate_section_feed() in the demux +API. +</para> +<para>On demux platforms that provide section filtering in hardware, the Section Feed API +implementation provides a software wrapper for the demux hardware. Other platforms may +support only PID filtering in hardware, requiring that TS packets are converted to sections in +software. In the latter case the Section Feed API implementation can be a client of the TS +Feed API. +</para> + +</section> +<section id="kdapi_set"> +<title>set()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This function sets the parameters of a section feed. Any filtering in progress on + the section feed must be stopped before calling this function. If descrambling + is enabled, the payload_scrambling_control and address_scrambling_control + fields of received DVB datagram sections should be observed. If either one is + non-zero, the section should be descrambled either in hardware or using the + functions descramble_mac_address() and descramble_section_payload() of the + demux API. Note that according to the MPEG-2 Systems specification, only + the payloads of private sections can be scrambled while the rest of the section + data must be sent in the clear.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int set(dmx_section_feed_t⋆ feed, __u16 pid, size_t + circular_buffer_size, int descramble, int + check_crc);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>dmx_section_feed_t* + feed</para> +</entry><entry + align="char"> +<para>Pointer to the section feed API and instance data.</para> +</entry> + </row><row><entry + align="char"> +<para>__u16 pid</para> +</entry><entry + align="char"> +<para>PID value to filter; only the TS packets carrying the + specified PID will be accepted.</para> +</entry> + </row><row><entry + align="char"> +<para>size_t + circular_buffer_size</para> +</entry><entry + align="char"> +<para>Size of the circular buffer for filtered sections.</para> +</entry> + </row><row><entry + align="char"> +<para>int descramble</para> +</entry><entry + align="char"> +<para>If non-zero, descramble any sections that are scrambled.</para> +</entry> + </row><row><entry + align="char"> +<para>int check_crc</para> +</entry><entry + align="char"> +<para>If non-zero, check the CRC values of filtered sections.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURNS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>0</para> +</entry><entry + align="char"> +<para>The function was completed without errors.</para> +</entry> + </row><row><entry + align="char"> +<para>-ENOMEM</para> +</entry><entry + align="char"> +<para>Not enough memory for the requested buffer size.</para> +</entry> + </row><row><entry + align="char"> +<para>-ENOSYS</para> +</entry><entry + align="char"> +<para>No descrambling facility available for sections.</para> +</entry> + </row><row><entry + align="char"> +<para>-EINVAL</para> +</entry><entry + align="char"> +<para>Bad parameters.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section +role="subsection"><title>allocate_filter()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This function is used to allocate a section filter on the demux. It should only be + called when no filtering is in progress on this section feed. If a filter cannot be + allocated, the function fails with -ENOSPC. See in section ?? for the format of + the section filter.</para> +</entry> + </row><row><entry + align="char"> +<para>The bitfields filter_mask and filter_value should only be modified when no + filtering is in progress on this section feed. filter_mask controls which bits of + filter_value are compared with the section headers/payload. On a binary value + of 1 in filter_mask, the corresponding bits are compared. The filter only accepts + sections that are equal to filter_value in all the tested bit positions. Any changes + to the values of filter_mask and filter_value are guaranteed to take effect only + when the start_filtering() function is called next time. The parent pointer in + the struct is initialized by the API implementation to the value of the feed + parameter. The priv pointer is not used by the API implementation, and can + thus be freely utilized by the caller of this function. Any data pointed to by the + priv pointer is available to the recipient of the dmx_section_cb() function call.</para> +</entry> + </row><row><entry + align="char"> +<para>While the maximum section filter length (DMX_MAX_FILTER_SIZE) is + currently set at 16 bytes, hardware filters of that size are not available on all + platforms. Therefore, section filtering will often take place first in hardware, + followed by filtering in software for the header bytes that were not covered + by a hardware filter. The filter_mask field can be checked to determine how + many bytes of the section filter are actually used, and if the hardware filter will + suffice. Additionally, software-only section filters can optionally be allocated + to clients when all hardware section filters are in use. Note that on most demux + hardware it is not possible to filter on the section_length field of the section + header – thus this field is ignored, even though it is included in filter_value and + filter_mask fields.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int allocate_filter(dmx_section_feed_t⋆ feed, + dmx_section_filter_t⋆⋆ filter);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>dmx_section_feed_t* + feed</para> +</entry><entry + align="char"> +<para>Pointer to the section feed API and instance data.</para> +</entry> + </row><row><entry + align="char"> +<para>dmx_section_filter_t** + filter</para> +</entry><entry + align="char"> +<para>Pointer to the allocated filter.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURNS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>0</para> +</entry><entry + align="char"> +<para>The function was completed without errors.</para> +</entry> + </row><row><entry + align="char"> +<para>-ENOSPC</para> +</entry><entry + align="char"> +<para>No filters of given type and length available.</para> +</entry> + </row><row><entry + align="char"> +<para>-EINVAL</para> +</entry><entry + align="char"> +<para>Bad parameters.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section +role="subsection"><title>release_filter()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This function releases all the resources of a previously allocated section filter. + The function should not be called while filtering is in progress on this section + feed. After calling this function, the caller should not try to dereference the + filter pointer.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int release_filter ( dmx_section_feed_t⋆ feed, + dmx_section_filter_t⋆ filter);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>dmx_section_feed_t* + feed</para> +</entry><entry + align="char"> +<para>Pointer to the section feed API and instance data.</para> +</entry> + </row><row><entry + align="char"> +<para>dmx_section_filter_t* + filter</para> +</entry><entry + align="char"> +<para>I/O Pointer to the instance data of a section filter.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURNS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>0</para> +</entry><entry + align="char"> +<para>The function was completed without errors.</para> +</entry> + </row><row><entry + align="char"> +<para>-ENODEV</para> +</entry><entry + align="char"> +<para>No such filter allocated.</para> +</entry> + </row><row><entry + align="char"> +<para>-EINVAL</para> +</entry><entry + align="char"> +<para>Bad parameter.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section +role="subsection"><title>start_filtering()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>Starts filtering sections on this section feed, according to its settings. Sections + are first filtered based on their PID and then matched with the section + filters allocated for this feed. If the section matches the PID filter and + at least one section filter, it is delivered to the API client. The section + is delivered asynchronously using the callback function registered with + allocate_section_feed().</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int start_filtering ( dmx_section_feed_t⋆ feed );</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>dmx_section_feed_t* + feed</para> +</entry><entry + align="char"> +<para>Pointer to the section feed API and instance data.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURNS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>0</para> +</entry><entry + align="char"> +<para>The function was completed without errors.</para> +</entry> + </row><row><entry + align="char"> +<para>-EINVAL</para> +</entry><entry + align="char"> +<para>Bad parameter.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section +role="subsection"><title>stop_filtering()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>Stops filtering sections on this section feed. Note that any changes to the + filtering parameters (filter_value, filter_mask, etc.) should only be made when + filtering is stopped.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int stop_filtering ( dmx_section_feed_t⋆ feed );</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>dmx_section_feed_t* + feed</para> +</entry><entry + align="char"> +<para>Pointer to the section feed API and instance data.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURNS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>0</para> +</entry><entry + align="char"> +<para>The function was completed without errors.</para> +</entry> + </row><row><entry + align="char"> +<para>-EINVAL</para> +</entry><entry + align="char"> +<para>Bad parameter.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section> diff --git a/Documentation/DocBook/media/dvb/net.xml b/Documentation/DocBook/media/dvb/net.xml new file mode 100644 index 00000000000..a193e86941b --- /dev/null +++ b/Documentation/DocBook/media/dvb/net.xml @@ -0,0 +1,156 @@ +<title>DVB Network API</title> +<para>The DVB net device enables feeding of MPE (multi protocol encapsulation) packets +received via DVB into the Linux network protocol stack, e.g. for internet via satellite +applications. It can be accessed through <emphasis role="tt">/dev/dvb/adapter0/net0</emphasis>. Data types and +and ioctl definitions can be accessed by including <emphasis role="tt">linux/dvb/net.h</emphasis> in your +application. +</para> +<section id="dvb_net_types"> +<title>DVB Net Data Types</title> + +<section id="dvb-net-if"> +<title>struct dvb_net_if</title> +<programlisting> +struct dvb_net_if { + __u16 pid; + __u16 if_num; + __u8 feedtype; +#define DVB_NET_FEEDTYPE_MPE 0 /⋆ multi protocol encapsulation ⋆/ +#define DVB_NET_FEEDTYPE_ULE 1 /⋆ ultra lightweight encapsulation ⋆/ +}; +</programlisting> +</section> + +</section> +<section id="net_fcalls"> +<title>DVB net Function Calls</title> +<para>To be written… +</para> + +<section id="NET_ADD_IF" +role="subsection"><title>NET_ADD_IF</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl is undocumented. Documentation is welcome.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(fd, int request = NET_ADD_IF, + struct dvb_net_if *if);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals NET_ADD_IF for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>struct dvb_net_if *if +</para> +</entry><entry + align="char"> +<para>Undocumented.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +</section> + +<section id="NET_REMOVE_IF" +role="subsection"><title>NET_REMOVE_IF</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl is undocumented. Documentation is welcome.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(fd, int request = NET_REMOVE_IF); +</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals NET_REMOVE_IF for this command.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +</section> + +<section id="NET_GET_IF" +role="subsection"><title>NET_GET_IF</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl is undocumented. Documentation is welcome.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(fd, int request = NET_GET_IF, + struct dvb_net_if *if);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals NET_GET_IF for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>struct dvb_net_if *if +</para> +</entry><entry + align="char"> +<para>Undocumented.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +</section> +</section> diff --git a/Documentation/DocBook/media/dvb/video.xml b/Documentation/DocBook/media/dvb/video.xml new file mode 100644 index 00000000000..3ea1ca7e785 --- /dev/null +++ b/Documentation/DocBook/media/dvb/video.xml @@ -0,0 +1,1968 @@ +<title>DVB Video Device</title> +<para>The DVB video device controls the MPEG2 video decoder of the DVB hardware. It +can be accessed through <emphasis role="tt">/dev/dvb/adapter0/video0</emphasis>. Data types and and +ioctl definitions can be accessed by including <emphasis role="tt">linux/dvb/video.h</emphasis> in your +application. +</para> +<para>Note that the DVB video device only controls decoding of the MPEG video stream, not +its presentation on the TV or computer screen. On PCs this is typically handled by an +associated video4linux device, e.g. <emphasis role="tt">/dev/video</emphasis>, which allows scaling and defining output +windows. +</para> +<para>Some DVB cards don’t have their own MPEG decoder, which results in the omission of +the audio and video device as well as the video4linux device. +</para> +<para>The ioctls that deal with SPUs (sub picture units) and navigation packets are only +supported on some MPEG decoders made for DVD playback. +</para> +<para> +These ioctls were also used by V4L2 to control MPEG decoders implemented in V4L2. The use +of these ioctls for that purpose has been made obsolete and proper V4L2 ioctls or controls +have been created to replace that functionality.</para> +<section id="video_types"> +<title>Video Data Types</title> + +<section id="video-format-t"> +<title>video_format_t</title> +<para>The <emphasis role="tt">video_format_t</emphasis> data type defined by +</para> +<programlisting> +typedef enum { + VIDEO_FORMAT_4_3, /⋆ Select 4:3 format ⋆/ + VIDEO_FORMAT_16_9, /⋆ Select 16:9 format. ⋆/ + VIDEO_FORMAT_221_1 /⋆ 2.21:1 ⋆/ +} video_format_t; +</programlisting> +<para>is used in the VIDEO_SET_FORMAT function (??) to tell the driver which aspect ratio +the output hardware (e.g. TV) has. It is also used in the data structures video_status +(??) returned by VIDEO_GET_STATUS (??) and video_event (??) returned by +VIDEO_GET_EVENT (??) which report about the display format of the current video +stream. +</para> +</section> + +<section id="video-displayformat-t"> +<title>video_displayformat_t</title> +<para>In case the display format of the video stream and of the display hardware differ the +application has to specify how to handle the cropping of the picture. This can be done using +the VIDEO_SET_DISPLAY_FORMAT call (??) which accepts +</para> +<programlisting> +typedef enum { + VIDEO_PAN_SCAN, /⋆ use pan and scan format ⋆/ + VIDEO_LETTER_BOX, /⋆ use letterbox format ⋆/ + VIDEO_CENTER_CUT_OUT /⋆ use center cut out format ⋆/ +} video_displayformat_t; +</programlisting> +<para>as argument. +</para> +</section> + +<section id="video-stream-source-t"> +<title>video_stream_source_t</title> +<para>The video stream source is set through the VIDEO_SELECT_SOURCE call and can take +the following values, depending on whether we are replaying from an internal (demuxer) or +external (user write) source. +</para> +<programlisting> +typedef enum { + VIDEO_SOURCE_DEMUX, /⋆ Select the demux as the main source ⋆/ + VIDEO_SOURCE_MEMORY /⋆ If this source is selected, the stream + comes from the user through the write + system call ⋆/ +} video_stream_source_t; +</programlisting> +<para>VIDEO_SOURCE_DEMUX selects the demultiplexer (fed either by the frontend or the +DVR device) as the source of the video stream. If VIDEO_SOURCE_MEMORY +is selected the stream comes from the application through the <emphasis role="tt">write()</emphasis> system +call. +</para> +</section> + +<section id="video-play-state-t"> +<title>video_play_state_t</title> +<para>The following values can be returned by the VIDEO_GET_STATUS call representing the +state of video playback. +</para> +<programlisting> +typedef enum { + VIDEO_STOPPED, /⋆ Video is stopped ⋆/ + VIDEO_PLAYING, /⋆ Video is currently playing ⋆/ + VIDEO_FREEZED /⋆ Video is freezed ⋆/ +} video_play_state_t; +</programlisting> +</section> + +<section id="video-command"> +<title>struct video_command</title> +<para>The structure must be zeroed before use by the application +This ensures it can be extended safely in the future.</para> +<programlisting> +struct video_command { + __u32 cmd; + __u32 flags; + union { + struct { + __u64 pts; + } stop; + + struct { + /⋆ 0 or 1000 specifies normal speed, + 1 specifies forward single stepping, + -1 specifies backward single stepping, + >>1: playback at speed/1000 of the normal speed, + <-1: reverse playback at (-speed/1000) of the normal speed. ⋆/ + __s32 speed; + __u32 format; + } play; + + struct { + __u32 data[16]; + } raw; + }; +}; +</programlisting> +</section> + +<section id="video-size-t"> +<title>video_size_t</title> +<programlisting> +typedef struct { + int w; + int h; + video_format_t aspect_ratio; +} video_size_t; +</programlisting> +</section> + + +<section id="video-event"> +<title>struct video_event</title> +<para>The following is the structure of a video event as it is returned by the VIDEO_GET_EVENT +call. +</para> +<programlisting> +struct video_event { + __s32 type; +#define VIDEO_EVENT_SIZE_CHANGED 1 +#define VIDEO_EVENT_FRAME_RATE_CHANGED 2 +#define VIDEO_EVENT_DECODER_STOPPED 3 +#define VIDEO_EVENT_VSYNC 4 + __kernel_time_t timestamp; + union { + video_size_t size; + unsigned int frame_rate; /⋆ in frames per 1000sec ⋆/ + unsigned char vsync_field; /⋆ unknown/odd/even/progressive ⋆/ + } u; +}; +</programlisting> +</section> + +<section id="video-status"> +<title>struct video_status</title> +<para>The VIDEO_GET_STATUS call returns the following structure informing about various +states of the playback operation. +</para> +<programlisting> +struct video_status { + int video_blank; /⋆ blank video on freeze? ⋆/ + video_play_state_t play_state; /⋆ current state of playback ⋆/ + video_stream_source_t stream_source; /⋆ current source (demux/memory) ⋆/ + video_format_t video_format; /⋆ current aspect ratio of stream ⋆/ + video_displayformat_t display_format;/⋆ selected cropping mode ⋆/ +}; +</programlisting> +<para>If video_blank is set video will be blanked out if the channel is changed or if playback is +stopped. Otherwise, the last picture will be displayed. play_state indicates if the video is +currently frozen, stopped, or being played back. The stream_source corresponds to the seleted +source for the video stream. It can come either from the demultiplexer or from memory. +The video_format indicates the aspect ratio (one of 4:3 or 16:9) of the currently +played video stream. Finally, display_format corresponds to the selected cropping +mode in case the source video format is not the same as the format of the output +device. +</para> +</section> + +<section id="video-still-picture"> +<title>struct video_still_picture</title> +<para>An I-frame displayed via the VIDEO_STILLPICTURE call is passed on within the +following structure. +</para> +<programlisting> +/⋆ pointer to and size of a single iframe in memory ⋆/ +struct video_still_picture { + char ⋆iFrame; /⋆ pointer to a single iframe in memory ⋆/ + int32_t size; +}; +</programlisting> +</section> + +<section id="video_caps"> +<title>video capabilities</title> +<para>A call to VIDEO_GET_CAPABILITIES returns an unsigned integer with the following +bits set according to the hardwares capabilities. +</para> +<programlisting> + /⋆ bit definitions for capabilities: ⋆/ + /⋆ can the hardware decode MPEG1 and/or MPEG2? ⋆/ + #define VIDEO_CAP_MPEG1 1 + #define VIDEO_CAP_MPEG2 2 + /⋆ can you send a system and/or program stream to video device? + (you still have to open the video and the audio device but only + send the stream to the video device) ⋆/ + #define VIDEO_CAP_SYS 4 + #define VIDEO_CAP_PROG 8 + /⋆ can the driver also handle SPU, NAVI and CSS encoded data? + (CSS API is not present yet) ⋆/ + #define VIDEO_CAP_SPU 16 + #define VIDEO_CAP_NAVI 32 + #define VIDEO_CAP_CSS 64 +</programlisting> +</section> + +<section id="video-system"> +<title>video_system_t</title> +<para>A call to VIDEO_SET_SYSTEM sets the desired video system for TV output. The +following system types can be set: +</para> +<programlisting> +typedef enum { + VIDEO_SYSTEM_PAL, + VIDEO_SYSTEM_NTSC, + VIDEO_SYSTEM_PALN, + VIDEO_SYSTEM_PALNc, + VIDEO_SYSTEM_PALM, + VIDEO_SYSTEM_NTSC60, + VIDEO_SYSTEM_PAL60, + VIDEO_SYSTEM_PALM60 +} video_system_t; +</programlisting> +</section> + +<section id="video-highlight"> +<title>struct video_highlight</title> +<para>Calling the ioctl VIDEO_SET_HIGHLIGHTS posts the SPU highlight information. The +call expects the following format for that information: +</para> +<programlisting> + typedef + struct video_highlight { + boolean active; /⋆ 1=show highlight, 0=hide highlight ⋆/ + uint8_t contrast1; /⋆ 7- 4 Pattern pixel contrast ⋆/ + /⋆ 3- 0 Background pixel contrast ⋆/ + uint8_t contrast2; /⋆ 7- 4 Emphasis pixel-2 contrast ⋆/ + /⋆ 3- 0 Emphasis pixel-1 contrast ⋆/ + uint8_t color1; /⋆ 7- 4 Pattern pixel color ⋆/ + /⋆ 3- 0 Background pixel color ⋆/ + uint8_t color2; /⋆ 7- 4 Emphasis pixel-2 color ⋆/ + /⋆ 3- 0 Emphasis pixel-1 color ⋆/ + uint32_t ypos; /⋆ 23-22 auto action mode ⋆/ + /⋆ 21-12 start y ⋆/ + /⋆ 9- 0 end y ⋆/ + uint32_t xpos; /⋆ 23-22 button color number ⋆/ + /⋆ 21-12 start x ⋆/ + /⋆ 9- 0 end x ⋆/ + } video_highlight_t; +</programlisting> + +</section> +<section id="video-spu"> +<title>struct video_spu</title> +<para>Calling VIDEO_SET_SPU deactivates or activates SPU decoding, according to the +following format: +</para> +<programlisting> + typedef + struct video_spu { + boolean active; + int stream_id; + } video_spu_t; +</programlisting> + +</section> +<section id="video-spu-palette"> +<title>struct video_spu_palette</title> +<para>The following structure is used to set the SPU palette by calling VIDEO_SPU_PALETTE: +</para> +<programlisting> + typedef + struct video_spu_palette { + int length; + uint8_t ⋆palette; + } video_spu_palette_t; +</programlisting> + +</section> +<section id="video-navi-pack"> +<title>struct video_navi_pack</title> +<para>In order to get the navigational data the following structure has to be passed to the ioctl +VIDEO_GET_NAVI: +</para> +<programlisting> + typedef + struct video_navi_pack { + int length; /⋆ 0 ... 1024 ⋆/ + uint8_t data[1024]; + } video_navi_pack_t; +</programlisting> +</section> + + +<section id="video-attributes-t"> +<title>video_attributes_t</title> +<para>The following attributes can be set by a call to VIDEO_SET_ATTRIBUTES: +</para> +<programlisting> + typedef uint16_t video_attributes_t; + /⋆ bits: descr. ⋆/ + /⋆ 15-14 Video compression mode (0=MPEG-1, 1=MPEG-2) ⋆/ + /⋆ 13-12 TV system (0=525/60, 1=625/50) ⋆/ + /⋆ 11-10 Aspect ratio (0=4:3, 3=16:9) ⋆/ + /⋆ 9- 8 permitted display mode on 4:3 monitor (0=both, 1=only pan-sca ⋆/ + /⋆ 7 line 21-1 data present in GOP (1=yes, 0=no) ⋆/ + /⋆ 6 line 21-2 data present in GOP (1=yes, 0=no) ⋆/ + /⋆ 5- 3 source resolution (0=720x480/576, 1=704x480/576, 2=352x480/57 ⋆/ + /⋆ 2 source letterboxed (1=yes, 0=no) ⋆/ + /⋆ 0 film/camera mode (0=camera, 1=film (625/50 only)) ⋆/ +</programlisting> +</section></section> + + +<section id="video_function_calls"> +<title>Video Function Calls</title> + + +<section id="video_fopen"> +<title>open()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This system call opens a named video device (e.g. /dev/dvb/adapter0/video0) + for subsequent use.</para> +<para>When an open() call has succeeded, the device will be ready for use. + The significance of blocking or non-blocking mode is described in the + documentation for functions where there is a difference. It does not affect the + semantics of the open() call itself. A device opened in blocking mode can later + be put into non-blocking mode (and vice versa) using the F_SETFL command + of the fcntl system call. This is a standard system call, documented in the Linux + manual page for fcntl. Only one user can open the Video Device in O_RDWR + mode. All other attempts to open the device in this mode will fail, and an + error-code will be returned. If the Video Device is opened in O_RDONLY + mode, the only ioctl call that can be used is VIDEO_GET_STATUS. All other + call will return an error code.</para> +</entry> + </row></tbody></tgroup></informaltable> + +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int open(const char ⋆deviceName, int flags);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>const char + *deviceName</para> +</entry><entry + align="char"> +<para>Name of specific video device.</para> +</entry> + </row><row><entry + align="char"> +<para>int flags</para> +</entry><entry + align="char"> +<para>A bit-wise OR of the following flags:</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>O_RDONLY read-only access</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>O_RDWR read/write access</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>O_NONBLOCK open in non-blocking mode</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>(blocking mode is the default)</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURN VALUE</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>ENODEV</para> +</entry><entry + align="char"> +<para>Device driver not loaded/available.</para> +</entry> + </row><row><entry + align="char"> +<para>EINTERNAL</para> +</entry><entry + align="char"> +<para>Internal error.</para> +</entry> + </row><row><entry + align="char"> +<para>EBUSY</para> +</entry><entry + align="char"> +<para>Device or resource busy.</para> +</entry> + </row><row><entry + align="char"> +<para>EINVAL</para> +</entry><entry + align="char"> +<para>Invalid argument.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section> +<section id="video_fclose"> +<title>close()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This system call closes a previously opened video device.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int close(int fd);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURN VALUE</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>EBADF</para> +</entry><entry + align="char"> +<para>fd is not a valid open file descriptor.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section> +<section id="video_fwrite"> +<title>write()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This system call can only be used if VIDEO_SOURCE_MEMORY is selected + in the ioctl call VIDEO_SELECT_SOURCE. The data provided shall be in + PES format, unless the capability allows other formats. If O_NONBLOCK is + not specified the function will block until buffer space is available. The amount + of data to be transferred is implied by count.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>size_t write(int fd, const void ⋆buf, size_t count);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>void *buf</para> +</entry><entry + align="char"> +<para>Pointer to the buffer containing the PES data.</para> +</entry> + </row><row><entry + align="char"> +<para>size_t count</para> +</entry><entry + align="char"> +<para>Size of buf.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURN VALUE</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>EPERM</para> +</entry><entry + align="char"> +<para>Mode VIDEO_SOURCE_MEMORY not selected.</para> +</entry> + </row><row><entry + align="char"> +<para>ENOMEM</para> +</entry><entry + align="char"> +<para>Attempted to write more data than the internal buffer can + hold.</para> +</entry> + </row><row><entry + align="char"> +<para>EBADF</para> +</entry><entry + align="char"> +<para>fd is not a valid open file descriptor.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section id="VIDEO_STOP" +role="subsection"><title>VIDEO_STOP</title> +<para>DESCRIPTION +</para> +<para>This ioctl is for DVB devices only. To control a V4L2 decoder use the V4L2 +&VIDIOC-DECODER-CMD; instead.</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call asks the Video Device to stop playing the current stream. + Depending on the input parameter, the screen can be blanked out or displaying + the last decoded frame.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(fd, int request = VIDEO_STOP, boolean + mode);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals VIDEO_STOP for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>Boolean mode</para> +</entry><entry + align="char"> +<para>Indicates how the screen shall be handled.</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>TRUE: Blank screen when stop.</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>FALSE: Show last decoded frame.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="VIDEO_PLAY" +role="subsection"><title>VIDEO_PLAY</title> +<para>DESCRIPTION +</para> +<para>This ioctl is for DVB devices only. To control a V4L2 decoder use the V4L2 +&VIDIOC-DECODER-CMD; instead.</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call asks the Video Device to start playing a video stream from the + selected source.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(fd, int request = VIDEO_PLAY);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals VIDEO_PLAY for this command.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="VIDEO_FREEZE" +role="subsection"><title>VIDEO_FREEZE</title> +<para>DESCRIPTION +</para> +<para>This ioctl is for DVB devices only. To control a V4L2 decoder use the V4L2 +&VIDIOC-DECODER-CMD; instead.</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call suspends the live video stream being played. Decoding + and playing are frozen. It is then possible to restart the decoding + and playing process of the video stream using the VIDEO_CONTINUE + command. If VIDEO_SOURCE_MEMORY is selected in the ioctl call + VIDEO_SELECT_SOURCE, the DVB subsystem will not decode any more + data until the ioctl call VIDEO_CONTINUE or VIDEO_PLAY is performed.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(fd, int request = VIDEO_FREEZE);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals VIDEO_FREEZE for this command.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="VIDEO_CONTINUE" +role="subsection"><title>VIDEO_CONTINUE</title> +<para>DESCRIPTION +</para> +<para>This ioctl is for DVB devices only. To control a V4L2 decoder use the V4L2 +&VIDIOC-DECODER-CMD; instead.</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call restarts decoding and playing processes of the video stream + which was played before a call to VIDEO_FREEZE was made.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(fd, int request = VIDEO_CONTINUE);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals VIDEO_CONTINUE for this command.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="VIDEO_SELECT_SOURCE" +role="subsection"><title>VIDEO_SELECT_SOURCE</title> +<para>DESCRIPTION +</para> +<para>This ioctl is for DVB devices only. This ioctl was also supported by the +V4L2 ivtv driver, but that has been replaced by the ivtv-specific +<constant>IVTV_IOC_PASSTHROUGH_MODE</constant> ioctl.</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call informs the video device which source shall be used for the input + data. The possible sources are demux or memory. If memory is selected, the + data is fed to the video device through the write command.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(fd, int request = VIDEO_SELECT_SOURCE, + video_stream_source_t source);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals VIDEO_SELECT_SOURCE for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>video_stream_source_t + source</para> +</entry><entry + align="char"> +<para>Indicates which source shall be used for the Video stream.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="VIDEO_SET_BLANK" +role="subsection"><title>VIDEO_SET_BLANK</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call asks the Video Device to blank out the picture.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(fd, int request = VIDEO_SET_BLANK, boolean + mode);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals VIDEO_SET_BLANK for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>boolean mode</para> +</entry><entry + align="char"> +<para>TRUE: Blank screen when stop.</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>FALSE: Show last decoded frame.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="VIDEO_GET_STATUS" +role="subsection"><title>VIDEO_GET_STATUS</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call asks the Video Device to return the current status of the device.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para> int ioctl(fd, int request = VIDEO_GET_STATUS, struct + video_status ⋆status);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals VIDEO_GET_STATUS for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>struct video_status + *status</para> +</entry><entry + align="char"> +<para>Returns the current status of the Video Device.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="VIDEO_GET_FRAME_COUNT" +role="subsection"><title>VIDEO_GET_FRAME_COUNT</title> +<para>DESCRIPTION +</para> +<para>This ioctl is obsolete. Do not use in new drivers. For V4L2 decoders this +ioctl has been replaced by the <constant>V4L2_CID_MPEG_VIDEO_DEC_FRAME</constant> control.</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call asks the Video Device to return the number of displayed frames +since the decoder was started.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = + VIDEO_GET_FRAME_COUNT, __u64 *pts);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals VIDEO_GET_FRAME_COUNT for this + command.</para> +</entry> + </row><row><entry + align="char"> +<para>__u64 *pts +</para> +</entry><entry + align="char"> +<para>Returns the number of frames displayed since the decoder was started. +</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="VIDEO_GET_PTS" +role="subsection"><title>VIDEO_GET_PTS</title> +<para>DESCRIPTION +</para> +<para>This ioctl is obsolete. Do not use in new drivers. For V4L2 decoders this +ioctl has been replaced by the <constant>V4L2_CID_MPEG_VIDEO_DEC_PTS</constant> control.</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call asks the Video Device to return the current PTS timestamp.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = + VIDEO_GET_PTS, __u64 *pts);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals VIDEO_GET_PTS for this + command.</para> +</entry> + </row><row><entry + align="char"> +<para>__u64 *pts +</para> +</entry><entry + align="char"> +<para>Returns the 33-bit timestamp as defined in ITU T-REC-H.222.0 / ISO/IEC 13818-1. +</para> +<para> +The PTS should belong to the currently played +frame if possible, but may also be a value close to it +like the PTS of the last decoded frame or the last PTS +extracted by the PES parser.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="VIDEO_GET_FRAME_RATE" +role="subsection"><title>VIDEO_GET_FRAME_RATE</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call asks the Video Device to return the current framerate.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = + VIDEO_GET_FRAME_RATE, unsigned int *rate);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals VIDEO_GET_FRAME_RATE for this + command.</para> +</entry> + </row><row><entry + align="char"> +<para>unsigned int *rate +</para> +</entry><entry + align="char"> +<para>Returns the framerate in number of frames per 1000 seconds. +</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="VIDEO_GET_EVENT" +role="subsection"><title>VIDEO_GET_EVENT</title> +<para>DESCRIPTION +</para> +<para>This ioctl is for DVB devices only. To get events from a V4L2 decoder use the V4L2 +&VIDIOC-DQEVENT; ioctl instead.</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call returns an event of type video_event if available. If an event is + not available, the behavior depends on whether the device is in blocking or + non-blocking mode. In the latter case, the call fails immediately with errno + set to EWOULDBLOCK. In the former case, the call blocks until an event + becomes available. The standard Linux poll() and/or select() system calls can + be used with the device file descriptor to watch for new events. For select(), + the file descriptor should be included in the exceptfds argument, and for + poll(), POLLPRI should be specified as the wake-up condition. Read-only + permissions are sufficient for this ioctl call.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para> int ioctl(fd, int request = VIDEO_GET_EVENT, struct + video_event ⋆ev);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals VIDEO_GET_EVENT for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>struct video_event + *ev</para> +</entry><entry + align="char"> +<para>Points to the location where the event, if any, is to be + stored.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>EWOULDBLOCK</para> +</entry><entry + align="char"> +<para>There is no event pending, and the device is in + non-blocking mode.</para> +</entry> + </row><row><entry + align="char"> +<para>EOVERFLOW</para> +</entry><entry + align="char"> +<para>Overflow in event queue - one or more events were lost.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section id="VIDEO_COMMAND" +role="subsection"><title>VIDEO_COMMAND</title> +<para>DESCRIPTION +</para> +<para>This ioctl is obsolete. Do not use in new drivers. For V4L2 decoders this +ioctl has been replaced by the &VIDIOC-DECODER-CMD; ioctl.</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl commands the decoder. The <constant>video_command</constant> struct +is a subset of the <constant>v4l2_decoder_cmd</constant> struct, so refer to the +&VIDIOC-DECODER-CMD; documentation for more information.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = + VIDEO_COMMAND, struct video_command *cmd);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals VIDEO_COMMAND for this + command.</para> +</entry> + </row><row><entry + align="char"> +<para>struct video_command *cmd +</para> +</entry><entry + align="char"> +<para>Commands the decoder. +</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="VIDEO_TRY_COMMAND" +role="subsection"><title>VIDEO_TRY_COMMAND</title> +<para>DESCRIPTION +</para> +<para>This ioctl is obsolete. Do not use in new drivers. For V4L2 decoders this +ioctl has been replaced by the &VIDIOC-TRY-DECODER-CMD; ioctl.</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl tries a decoder command. The <constant>video_command</constant> struct +is a subset of the <constant>v4l2_decoder_cmd</constant> struct, so refer to the +&VIDIOC-TRY-DECODER-CMD; documentation for more information.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = + VIDEO_TRY_COMMAND, struct video_command *cmd);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals VIDEO_TRY_COMMAND for this + command.</para> +</entry> + </row><row><entry + align="char"> +<para>struct video_command *cmd +</para> +</entry><entry + align="char"> +<para>Try a decoder command. +</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="VIDEO_GET_SIZE" +role="subsection"><title>VIDEO_GET_SIZE</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl returns the size and aspect ratio.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = + VIDEO_GET_SIZE, video_size_t *size);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals VIDEO_GET_SIZE for this + command.</para> +</entry> + </row><row><entry + align="char"> +<para>video_size_t *size +</para> +</entry><entry + align="char"> +<para>Returns the size and aspect ratio. +</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="VIDEO_SET_DISPLAY_FORMAT" +role="subsection"><title>VIDEO_SET_DISPLAY_FORMAT</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call asks the Video Device to select the video format to be applied + by the MPEG chip on the video.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para> int ioctl(fd, int request = + VIDEO_SET_DISPLAY_FORMAT, video_display_format_t + format);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals VIDEO_SET_DISPLAY_FORMAT for this + command.</para> +</entry> + </row><row><entry + align="char"> +<para>video_display_format_t + format</para> +</entry><entry + align="char"> +<para>Selects the video format to be used.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="VIDEO_STILLPICTURE" +role="subsection"><title>VIDEO_STILLPICTURE</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call asks the Video Device to display a still picture (I-frame). The + input data shall contain an I-frame. If the pointer is NULL, then the current + displayed still picture is blanked.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(fd, int request = VIDEO_STILLPICTURE, + struct video_still_picture ⋆sp);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals VIDEO_STILLPICTURE for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>struct + video_still_picture + *sp</para> +</entry><entry + align="char"> +<para>Pointer to a location where an I-frame and size is stored.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="VIDEO_FAST_FORWARD" +role="subsection"><title>VIDEO_FAST_FORWARD</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call asks the Video Device to skip decoding of N number of I-frames. + This call can only be used if VIDEO_SOURCE_MEMORY is selected.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(fd, int request = VIDEO_FAST_FORWARD, int + nFrames);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals VIDEO_FAST_FORWARD for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>int nFrames</para> +</entry><entry + align="char"> +<para>The number of frames to skip.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>EPERM</para> +</entry><entry + align="char"> +<para>Mode VIDEO_SOURCE_MEMORY not selected.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section id="VIDEO_SLOWMOTION" +role="subsection"><title>VIDEO_SLOWMOTION</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call asks the video device to repeat decoding frames N number of + times. This call can only be used if VIDEO_SOURCE_MEMORY is selected.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(fd, int request = VIDEO_SLOWMOTION, int + nFrames);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals VIDEO_SLOWMOTION for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>int nFrames</para> +</entry><entry + align="char"> +<para>The number of times to repeat each frame.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>EPERM</para> +</entry><entry + align="char"> +<para>Mode VIDEO_SOURCE_MEMORY not selected.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section id="VIDEO_GET_CAPABILITIES" +role="subsection"><title>VIDEO_GET_CAPABILITIES</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call asks the video device about its decoding capabilities. On success + it returns and integer which has bits set according to the defines in section ??.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(fd, int request = VIDEO_GET_CAPABILITIES, + unsigned int ⋆cap);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals VIDEO_GET_CAPABILITIES for this + command.</para> +</entry> + </row><row><entry + align="char"> +<para>unsigned int *cap</para> +</entry><entry + align="char"> +<para>Pointer to a location where to store the capability + information.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="VIDEO_SET_ID" +role="subsection"><title>VIDEO_SET_ID</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl selects which sub-stream is to be decoded if a program or system + stream is sent to the video device.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = VIDEO_SET_ID, int + id);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals VIDEO_SET_ID for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>int id</para> +</entry><entry + align="char"> +<para>video sub-stream id</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>EINVAL</para> +</entry><entry + align="char"> +<para>Invalid sub-stream id.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section id="VIDEO_CLEAR_BUFFER" +role="subsection"><title>VIDEO_CLEAR_BUFFER</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call clears all video buffers in the driver and in the decoder hardware.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(fd, int request = VIDEO_CLEAR_BUFFER);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals VIDEO_CLEAR_BUFFER for this command.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="VIDEO_SET_STREAMTYPE" +role="subsection"><title>VIDEO_SET_STREAMTYPE</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl tells the driver which kind of stream to expect being written to it. If + this call is not used the default of video PES is used. Some drivers might not + support this call and always expect PES.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(fd, int request = VIDEO_SET_STREAMTYPE, + int type);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals VIDEO_SET_STREAMTYPE for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>int type</para> +</entry><entry + align="char"> +<para>stream type</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="VIDEO_SET_FORMAT" +role="subsection"><title>VIDEO_SET_FORMAT</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl sets the screen format (aspect ratio) of the connected output device + (TV) so that the output of the decoder can be adjusted accordingly.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para> int ioctl(fd, int request = VIDEO_SET_FORMAT, + video_format_t format);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals VIDEO_SET_FORMAT for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>video_format_t + format</para> +</entry><entry + align="char"> +<para>video format of TV as defined in section ??.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>EINVAL</para> +</entry><entry + align="char"> +<para>format is not a valid video format.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section id="VIDEO_SET_SYSTEM" +role="subsection"><title>VIDEO_SET_SYSTEM</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl sets the television output format. The format (see section ??) may + vary from the color format of the displayed MPEG stream. If the hardware is + not able to display the requested format the call will return an error.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para> int ioctl(fd, int request = VIDEO_SET_SYSTEM , + video_system_t system);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals VIDEO_SET_FORMAT for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>video_system_t + system</para> +</entry><entry + align="char"> +<para>video system of TV output.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>EINVAL</para> +</entry><entry + align="char"> +<para>system is not a valid or supported video system.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section id="VIDEO_SET_HIGHLIGHT" +role="subsection"><title>VIDEO_SET_HIGHLIGHT</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl sets the SPU highlight information for the menu access of a DVD.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para> int ioctl(fd, int request = VIDEO_SET_HIGHLIGHT + ,video_highlight_t ⋆vhilite)</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals VIDEO_SET_HIGHLIGHT for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>video_highlight_t + *vhilite</para> +</entry><entry + align="char"> +<para>SPU Highlight information according to section ??.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="VIDEO_SET_SPU" +role="subsection"><title>VIDEO_SET_SPU</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl activates or deactivates SPU decoding in a DVD input stream. It can + only be used, if the driver is able to handle a DVD stream.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para> int ioctl(fd, int request = VIDEO_SET_SPU , + video_spu_t ⋆spu)</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals VIDEO_SET_SPU for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>video_spu_t *spu</para> +</entry><entry + align="char"> +<para>SPU decoding (de)activation and subid setting according + to section ??.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>EINVAL</para> +</entry><entry + align="char"> +<para>input is not a valid spu setting or driver cannot handle + SPU.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section id="VIDEO_SET_SPU_PALETTE" +role="subsection"><title>VIDEO_SET_SPU_PALETTE</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl sets the SPU color palette.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para> int ioctl(fd, int request = VIDEO_SET_SPU_PALETTE + ,video_spu_palette_t ⋆palette )</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals VIDEO_SET_SPU_PALETTE for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>video_spu_palette_t + *palette</para> +</entry><entry + align="char"> +<para>SPU palette according to section ??.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>EINVAL</para> +</entry><entry + align="char"> +<para>input is not a valid palette or driver doesn’t handle SPU.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section id="VIDEO_GET_NAVI" +role="subsection"><title>VIDEO_GET_NAVI</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl returns navigational information from the DVD stream. This is + especially needed if an encoded stream has to be decoded by the hardware.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para> int ioctl(fd, int request = VIDEO_GET_NAVI , + video_navi_pack_t ⋆navipack)</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals VIDEO_GET_NAVI for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>video_navi_pack_t + *navipack</para> +</entry><entry + align="char"> +<para>PCI or DSI pack (private stream 2) according to section + ??.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>EFAULT</para> +</entry><entry + align="char"> +<para>driver is not able to return navigational information</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section id="VIDEO_SET_ATTRIBUTES" +role="subsection"><title>VIDEO_SET_ATTRIBUTES</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl is intended for DVD playback and allows you to set certain + information about the stream. Some hardware may not need this information, + but the call also tells the hardware to prepare for DVD playback.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para> int ioctl(fd, int request = VIDEO_SET_ATTRIBUTE + ,video_attributes_t vattr)</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals VIDEO_SET_ATTRIBUTE for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>video_attributes_t + vattr</para> +</entry><entry + align="char"> +<para>video attributes according to section ??.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>EINVAL</para> +</entry><entry + align="char"> +<para>input is not a valid attribute setting.</para> +</entry> + </row></tbody></tgroup></informaltable> + </section></section> diff --git a/Documentation/DocBook/media/dvbstb.png.b64 b/Documentation/DocBook/media/dvbstb.png.b64 new file mode 100644 index 00000000000..e8b52fde3d1 --- /dev/null +++ b/Documentation/DocBook/media/dvbstb.png.b64 @@ -0,0 +1,398 @@ +iVBORw0KGgoAAAANSUhEUgAAAzMAAAGaCAYAAAA7Jx25AAAABmJLR0QAAAAAAAD5Q7t/AAAACXBI +WXMAAA3XAAANiQFmEOuiAAAgAElEQVR42uzdd1RU18I28GdgKFZUBE0saFA0KoqFFkEhKhbAQmxJ +bIkNNEpMEUwsMZarJMZrw4KxRExQczUqil0jRBA1GAjGQqLYC4TemdnfH76cj3HodYDntxaLmTll +zuw57Zmz9z4yIYQAkYZzcnJCSkoKGjZsyMIgIiIiquPS09PRoEEDyBhmqCaQyWRo06YN3nvvPRYG +ERERUR137Ngx/Pnnn5CzKKgmMDAwwKpVqxhmiIiIiAj29vZ4//33ocWiICIiIiKimohhhoiIiIiI 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294</abbrev> + <authorgroup> + <corpauthor>European Telecommunication Standards Institute +(<ulink url="http://www.etsi.org">http://www.etsi.org</ulink>)</corpauthor> + </authorgroup> + <title>EN 300 294 "625-line television Wide Screen Signalling +(WSS)"</title> + </biblioentry> + + <biblioentry id="ets300231"> + <abbrev>ETS 300 231</abbrev> + <authorgroup> + <corpauthor>European Telecommunication Standards Institute +(<ulink +url="http://www.etsi.org">http://www.etsi.org</ulink>)</corpauthor> + </authorgroup> + <title>ETS 300 231 "Specification of the domestic video +Programme Delivery Control system (PDC)"</title> + </biblioentry> + + <biblioentry id="ets300706"> + <abbrev>ETS 300 706</abbrev> + <authorgroup> + <corpauthor>European Telecommunication Standards Institute +(<ulink url="http://www.etsi.org">http://www.etsi.org</ulink>)</corpauthor> + </authorgroup> + <title>ETS 300 706 "Enhanced Teletext specification"</title> + </biblioentry> + + <biblioentry id="mpeg2part1"> + <abbrev>ISO 13818-1</abbrev> + <authorgroup> + <corpauthor>International Telecommunication Union (<ulink +url="http://www.itu.ch">http://www.itu.ch</ulink>), International +Organisation for Standardisation (<ulink +url="http://www.iso.ch">http://www.iso.ch</ulink>)</corpauthor> + </authorgroup> + <title>ITU-T Rec. H.222.0 | ISO/IEC 13818-1 "Information +technology — Generic coding of moving pictures and associated +audio information: Systems"</title> + </biblioentry> + + <biblioentry id="mpeg2part2"> + <abbrev>ISO 13818-2</abbrev> + <authorgroup> + <corpauthor>International Telecommunication Union (<ulink +url="http://www.itu.ch">http://www.itu.ch</ulink>), International +Organisation for Standardisation (<ulink +url="http://www.iso.ch">http://www.iso.ch</ulink>)</corpauthor> + </authorgroup> + <title>ITU-T Rec. H.262 | ISO/IEC 13818-2 "Information +technology — Generic coding of moving pictures and associated +audio information: Video"</title> + </biblioentry> + + <biblioentry id="itu470"> + <abbrev>ITU BT.470</abbrev> + <authorgroup> + <corpauthor>International Telecommunication Union (<ulink +url="http://www.itu.ch">http://www.itu.ch</ulink>)</corpauthor> + </authorgroup> + <title>ITU-R Recommendation BT.470-6 "Conventional Television +Systems"</title> + </biblioentry> + + <biblioentry id="itu601"> + <abbrev>ITU BT.601</abbrev> + <authorgroup> + <corpauthor>International Telecommunication Union (<ulink +url="http://www.itu.ch">http://www.itu.ch</ulink>)</corpauthor> + </authorgroup> + <title>ITU-R Recommendation BT.601-5 "Studio Encoding Parameters +of Digital Television for Standard 4:3 and Wide-Screen 16:9 Aspect +Ratios"</title> + </biblioentry> + + <biblioentry id="itu653"> + <abbrev>ITU BT.653</abbrev> + <authorgroup> + <corpauthor>International Telecommunication Union (<ulink +url="http://www.itu.ch">http://www.itu.ch</ulink>)</corpauthor> + </authorgroup> + <title>ITU-R Recommendation BT.653-3 "Teletext systems"</title> + </biblioentry> + + <biblioentry id="itu709"> + <abbrev>ITU BT.709</abbrev> + <authorgroup> + <corpauthor>International Telecommunication Union (<ulink +url="http://www.itu.ch">http://www.itu.ch</ulink>)</corpauthor> + </authorgroup> + <title>ITU-R Recommendation BT.709-5 "Parameter values for the +HDTV standards for production and international programme +exchange"</title> + </biblioentry> + + <biblioentry id="itu1119"> + <abbrev>ITU BT.1119</abbrev> + <authorgroup> + <corpauthor>International Telecommunication Union (<ulink +url="http://www.itu.ch">http://www.itu.ch</ulink>)</corpauthor> + </authorgroup> + <title>ITU-R Recommendation BT.1119 "625-line +television Wide Screen Signalling (WSS)"</title> + </biblioentry> + + <biblioentry id="jfif"> + <abbrev>JFIF</abbrev> + <authorgroup> + <corpauthor>Independent JPEG Group (<ulink +url="http://www.ijg.org">http://www.ijg.org</ulink>)</corpauthor> + </authorgroup> + <title>JPEG File Interchange Format</title> + <subtitle>Version 1.02</subtitle> + </biblioentry> + + <biblioentry id="itu-t81"> + <abbrev>ITU-T.81</abbrev> + <authorgroup> + <corpauthor>International Telecommunication Union +(<ulink url="http://www.itu.int">http://www.itu.int</ulink>)</corpauthor> + </authorgroup> + <title>ITU-T Recommendation T.81 +"Information Technology — Digital Compression and Coding of Continous-Tone +Still Images — Requirements and Guidelines"</title> + </biblioentry> + + <biblioentry id="w3c-jpeg-jfif"> + <abbrev>W3C JPEG JFIF</abbrev> + <authorgroup> + <corpauthor>The World Wide Web Consortium (<ulink +url="http://www.w3.org/Graphics/JPEG">http://www.w3.org</ulink>)</corpauthor> + </authorgroup> + <title>JPEG JFIF</title> + </biblioentry> + + <biblioentry id="smpte12m"> + <abbrev>SMPTE 12M</abbrev> + <authorgroup> + <corpauthor>Society of Motion Picture and Television Engineers +(<ulink url="http://www.smpte.org">http://www.smpte.org</ulink>)</corpauthor> + </authorgroup> + <title>SMPTE 12M-1999 "Television, Audio and Film - Time and +Control Code"</title> + </biblioentry> + + <biblioentry id="smpte170m"> + <abbrev>SMPTE 170M</abbrev> + <authorgroup> + <corpauthor>Society of Motion Picture and Television Engineers +(<ulink url="http://www.smpte.org">http://www.smpte.org</ulink>)</corpauthor> + </authorgroup> + <title>SMPTE 170M-1999 "Television - Composite Analog Video +Signal - NTSC for Studio Applications"</title> + </biblioentry> + + <biblioentry id="smpte240m"> + <abbrev>SMPTE 240M</abbrev> + <authorgroup> + <corpauthor>Society of Motion Picture and Television Engineers +(<ulink url="http://www.smpte.org">http://www.smpte.org</ulink>)</corpauthor> + </authorgroup> + <title>SMPTE 240M-1999 "Television - Signal Parameters - +1125-Line High-Definition Production"</title> + </biblioentry> + + <biblioentry id="iec62106"> + <abbrev>IEC 62106</abbrev> + <authorgroup> + <corpauthor>International Electrotechnical Commission +(<ulink url="http://www.iec.ch">http://www.iec.ch</ulink>)</corpauthor> + </authorgroup> + <title>Specification of the radio data system (RDS) for VHF/FM sound broadcasting +in the frequency range from 87,5 to 108,0 MHz</title> + </biblioentry> + + <biblioentry id="nrsc4"> + <abbrev>NRSC-4-B</abbrev> + <authorgroup> + <corpauthor>National Radio Systems Committee +(<ulink url="http://www.nrscstandards.org">http://www.nrscstandards.org</ulink>)</corpauthor> + </authorgroup> + <title>NRSC-4-B: United States RBDS Standard</title> + </biblioentry> + + <biblioentry id="iso12232"> + <abbrev>ISO 12232:2006</abbrev> + <authorgroup> + <corpauthor>International Organization for Standardization +(<ulink url="http://www.iso.org">http://www.iso.org</ulink>)</corpauthor> + </authorgroup> + <title>Photography — Digital still cameras — Determination + of exposure index, ISO speed ratings, standard output sensitivity, and + recommended exposure index</title> + </biblioentry> + + <biblioentry id="cea861"> + <abbrev>CEA-861-E</abbrev> + <authorgroup> + <corpauthor>Consumer Electronics Association +(<ulink url="http://www.ce.org">http://www.ce.org</ulink>)</corpauthor> + </authorgroup> + <title>A DTV Profile for Uncompressed High Speed Digital Interfaces</title> + </biblioentry> + + <biblioentry id="vesadmt"> + <abbrev>VESA DMT</abbrev> + <authorgroup> + <corpauthor>Video Electronics Standards Association +(<ulink url="http://www.vesa.org">http://www.vesa.org</ulink>)</corpauthor> + </authorgroup> + <title>VESA and Industry Standards and Guidelines for Computer Display Monitor Timing (DMT)</title> + </biblioentry> + + <biblioentry id="vesaedid"> + <abbrev>EDID</abbrev> + <authorgroup> + <corpauthor>Video Electronics Standards Association +(<ulink url="http://www.vesa.org">http://www.vesa.org</ulink>)</corpauthor> + </authorgroup> + <title>VESA Enhanced Extended Display Identification Data Standard</title> + <subtitle>Release A, Revision 2</subtitle> + </biblioentry> + + <biblioentry id="hdcp"> + <abbrev>HDCP</abbrev> + <authorgroup> + <corpauthor>Digital Content Protection LLC +(<ulink url="http://www.digital-cp.com">http://www.digital-cp.com</ulink>)</corpauthor> + </authorgroup> + <title>High-bandwidth Digital Content Protection System</title> + <subtitle>Revision 1.3</subtitle> + </biblioentry> + + <biblioentry id="hdmi"> + <abbrev>HDMI</abbrev> + <authorgroup> + <corpauthor>HDMI Licensing LLC +(<ulink url="http://www.hdmi.org">http://www.hdmi.org</ulink>)</corpauthor> + </authorgroup> + <title>High-Definition Multimedia Interface</title> + <subtitle>Specification Version 1.4a</subtitle> + </biblioentry> + + <biblioentry id="dp"> + <abbrev>DP</abbrev> + <authorgroup> + <corpauthor>Video Electronics Standards Association +(<ulink url="http://www.vesa.org">http://www.vesa.org</ulink>)</corpauthor> + </authorgroup> + <title>VESA DisplayPort Standard</title> + <subtitle>Version 1, Revision 2</subtitle> + </biblioentry> + + </bibliography> diff --git a/Documentation/DocBook/media/v4l/capture.c.xml b/Documentation/DocBook/media/v4l/capture.c.xml new file mode 100644 index 00000000000..1c5c49a2de5 --- /dev/null +++ b/Documentation/DocBook/media/v4l/capture.c.xml @@ -0,0 +1,659 @@ +<programlisting> +/* + * V4L2 video capture example + * + * This program can be used and distributed without restrictions. + * + * This program is provided with the V4L2 API + * see http://linuxtv.org/docs.php for more information + */ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <assert.h> + +#include <getopt.h> /* getopt_long() */ + +#include <fcntl.h> /* low-level i/o */ +#include <unistd.h> +#include <errno.h> +#include <sys/stat.h> +#include <sys/types.h> +#include <sys/time.h> +#include <sys/mman.h> +#include <sys/ioctl.h> + +#include <linux/videodev2.h> + +#define CLEAR(x) memset(&(x), 0, sizeof(x)) + +enum io_method { + IO_METHOD_READ, + IO_METHOD_MMAP, + IO_METHOD_USERPTR, +}; + +struct buffer { + void *start; + size_t length; +}; + +static char *dev_name; +static enum io_method io = IO_METHOD_MMAP; +static int fd = -1; +struct buffer *buffers; +static unsigned int n_buffers; +static int out_buf; +static int force_format; +static int frame_count = 70; + +static void errno_exit(const char *s) +{ + fprintf(stderr, "%s error %d, %s\n", s, errno, strerror(errno)); + exit(EXIT_FAILURE); +} + +static int xioctl(int fh, int request, void *arg) +{ + int r; + + do { + r = ioctl(fh, request, arg); + } while (-1 == r && EINTR == errno); + + return r; +} + +static void process_image(const void *p, int size) +{ + if (out_buf) + fwrite(p, size, 1, stdout); + + fflush(stderr); + fprintf(stderr, "."); + fflush(stdout); +} + +static int read_frame(void) +{ + struct <link linkend="v4l2-buffer">v4l2_buffer</link> buf; + unsigned int i; + + switch (io) { + case IO_METHOD_READ: + if (-1 == read(fd, buffers[0].start, buffers[0].length)) { + switch (errno) { + case EAGAIN: + return 0; + + case EIO: + /* Could ignore EIO, see spec. */ + + /* fall through */ + + default: + errno_exit("read"); + } + } + + process_image(buffers[0].start, buffers[0].length); + break; + + case IO_METHOD_MMAP: + CLEAR(buf); + + buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + buf.memory = V4L2_MEMORY_MMAP; + + if (-1 == xioctl(fd, VIDIOC_DQBUF, &buf)) { + switch (errno) { + case EAGAIN: + return 0; + + case EIO: + /* Could ignore EIO, see spec. */ + + /* fall through */ + + default: + errno_exit("VIDIOC_DQBUF"); + } + } + + assert(buf.index < n_buffers); + + process_image(buffers[buf.index].start, buf.bytesused); + + if (-1 == xioctl(fd, VIDIOC_QBUF, &buf)) + errno_exit("VIDIOC_QBUF"); + break; + + case IO_METHOD_USERPTR: + CLEAR(buf); + + buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + buf.memory = V4L2_MEMORY_USERPTR; + + if (-1 == xioctl(fd, VIDIOC_DQBUF, &buf)) { + switch (errno) { + case EAGAIN: + return 0; + + case EIO: + /* Could ignore EIO, see spec. */ + + /* fall through */ + + default: + errno_exit("VIDIOC_DQBUF"); + } + } + + for (i = 0; i < n_buffers; ++i) + if (buf.m.userptr == (unsigned long)buffers[i].start + && buf.length == buffers[i].length) + break; + + assert(i < n_buffers); + + process_image((void *)buf.m.userptr, buf.bytesused); + + if (-1 == xioctl(fd, VIDIOC_QBUF, &buf)) + errno_exit("VIDIOC_QBUF"); + break; + } + + return 1; +} + +static void mainloop(void) +{ + unsigned int count; + + count = frame_count; + + while (count-- > 0) { + for (;;) { + fd_set fds; + struct timeval tv; + int r; + + FD_ZERO(&fds); + FD_SET(fd, &fds); + + /* Timeout. */ + tv.tv_sec = 2; + tv.tv_usec = 0; + + r = select(fd + 1, &fds, NULL, NULL, &tv); + + if (-1 == r) { + if (EINTR == errno) + continue; + errno_exit("select"); + } + + if (0 == r) { + fprintf(stderr, "select timeout\n"); + exit(EXIT_FAILURE); + } + + if (read_frame()) + break; + /* EAGAIN - continue select loop. */ + } + } +} + +static void stop_capturing(void) +{ + enum <link linkend="v4l2-buf-type">v4l2_buf_type</link> type; + + switch (io) { + case IO_METHOD_READ: + /* Nothing to do. */ + break; + + case IO_METHOD_MMAP: + case IO_METHOD_USERPTR: + type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + if (-1 == xioctl(fd, VIDIOC_STREAMOFF, &type)) + errno_exit("VIDIOC_STREAMOFF"); + break; + } +} + +static void start_capturing(void) +{ + unsigned int i; + enum <link linkend="v4l2-buf-type">v4l2_buf_type</link> type; + + switch (io) { + case IO_METHOD_READ: + /* Nothing to do. */ + break; + + case IO_METHOD_MMAP: + for (i = 0; i < n_buffers; ++i) { + struct <link linkend="v4l2-buffer">v4l2_buffer</link> buf; + + CLEAR(buf); + buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + buf.memory = V4L2_MEMORY_MMAP; + buf.index = i; + + if (-1 == xioctl(fd, VIDIOC_QBUF, &buf)) + errno_exit("VIDIOC_QBUF"); + } + type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + if (-1 == xioctl(fd, VIDIOC_STREAMON, &type)) + errno_exit("VIDIOC_STREAMON"); + break; + + case IO_METHOD_USERPTR: + for (i = 0; i < n_buffers; ++i) { + struct <link linkend="v4l2-buffer">v4l2_buffer</link> buf; + + CLEAR(buf); + buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + buf.memory = V4L2_MEMORY_USERPTR; + buf.index = i; + buf.m.userptr = (unsigned long)buffers[i].start; + buf.length = buffers[i].length; + + if (-1 == xioctl(fd, VIDIOC_QBUF, &buf)) + errno_exit("VIDIOC_QBUF"); + } + type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + if (-1 == xioctl(fd, VIDIOC_STREAMON, &type)) + errno_exit("VIDIOC_STREAMON"); + break; + } +} + +static void uninit_device(void) +{ + unsigned int i; + + switch (io) { + case IO_METHOD_READ: + free(buffers[0].start); + break; + + case IO_METHOD_MMAP: + for (i = 0; i < n_buffers; ++i) + if (-1 == munmap(buffers[i].start, buffers[i].length)) + errno_exit("munmap"); + break; + + case IO_METHOD_USERPTR: + for (i = 0; i < n_buffers; ++i) + free(buffers[i].start); + break; + } + + free(buffers); +} + +static void init_read(unsigned int buffer_size) +{ + buffers = calloc(1, sizeof(*buffers)); + + if (!buffers) { + fprintf(stderr, "Out of memory\n"); + exit(EXIT_FAILURE); + } + + buffers[0].length = buffer_size; + buffers[0].start = malloc(buffer_size); + + if (!buffers[0].start) { + fprintf(stderr, "Out of memory\n"); + exit(EXIT_FAILURE); + } +} + +static void init_mmap(void) +{ + struct <link linkend="v4l2-requestbuffers">v4l2_requestbuffers</link> req; + + CLEAR(req); + + req.count = 4; + req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + req.memory = V4L2_MEMORY_MMAP; + + if (-1 == xioctl(fd, VIDIOC_REQBUFS, &req)) { + if (EINVAL == errno) { + fprintf(stderr, "%s does not support " + "memory mapping\n", dev_name); + exit(EXIT_FAILURE); + } else { + errno_exit("VIDIOC_REQBUFS"); + } + } + + if (req.count < 2) { + fprintf(stderr, "Insufficient buffer memory on %s\n", + dev_name); + exit(EXIT_FAILURE); + } + + buffers = calloc(req.count, sizeof(*buffers)); + + if (!buffers) { + fprintf(stderr, "Out of memory\n"); + exit(EXIT_FAILURE); + } + + for (n_buffers = 0; n_buffers < req.count; ++n_buffers) { + struct <link linkend="v4l2-buffer">v4l2_buffer</link> buf; + + CLEAR(buf); + + buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + buf.memory = V4L2_MEMORY_MMAP; + buf.index = n_buffers; + + if (-1 == xioctl(fd, VIDIOC_QUERYBUF, &buf)) + errno_exit("VIDIOC_QUERYBUF"); + + buffers[n_buffers].length = buf.length; + buffers[n_buffers].start = + mmap(NULL /* start anywhere */, + buf.length, + PROT_READ | PROT_WRITE /* required */, + MAP_SHARED /* recommended */, + fd, buf.m.offset); + + if (MAP_FAILED == buffers[n_buffers].start) + errno_exit("mmap"); + } +} + +static void init_userp(unsigned int buffer_size) +{ + struct <link linkend="v4l2-requestbuffers">v4l2_requestbuffers</link> req; + + CLEAR(req); + + req.count = 4; + req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + req.memory = V4L2_MEMORY_USERPTR; + + if (-1 == xioctl(fd, VIDIOC_REQBUFS, &req)) { + if (EINVAL == errno) { + fprintf(stderr, "%s does not support " + "user pointer i/o\n", dev_name); + exit(EXIT_FAILURE); + } else { + errno_exit("VIDIOC_REQBUFS"); + } + } + + buffers = calloc(4, sizeof(*buffers)); + + if (!buffers) { + fprintf(stderr, "Out of memory\n"); + exit(EXIT_FAILURE); + } + + for (n_buffers = 0; n_buffers < 4; ++n_buffers) { + buffers[n_buffers].length = buffer_size; + buffers[n_buffers].start = malloc(buffer_size); + + if (!buffers[n_buffers].start) { + fprintf(stderr, "Out of memory\n"); + exit(EXIT_FAILURE); + } + } +} + +static void init_device(void) +{ + struct <link linkend="v4l2-capability">v4l2_capability</link> cap; + struct <link linkend="v4l2-cropcap">v4l2_cropcap</link> cropcap; + struct <link linkend="v4l2-crop">v4l2_crop</link> crop; + struct <link linkend="v4l2-format">v4l2_format</link> fmt; + unsigned int min; + + if (-1 == xioctl(fd, VIDIOC_QUERYCAP, &cap)) { + if (EINVAL == errno) { + fprintf(stderr, "%s is no V4L2 device\n", + dev_name); + exit(EXIT_FAILURE); + } else { + errno_exit("VIDIOC_QUERYCAP"); + } + } + + if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) { + fprintf(stderr, "%s is no video capture device\n", + dev_name); + exit(EXIT_FAILURE); + } + + switch (io) { + case IO_METHOD_READ: + if (!(cap.capabilities & V4L2_CAP_READWRITE)) { + fprintf(stderr, "%s does not support read i/o\n", + dev_name); + exit(EXIT_FAILURE); + } + break; + + case IO_METHOD_MMAP: + case IO_METHOD_USERPTR: + if (!(cap.capabilities & V4L2_CAP_STREAMING)) { + fprintf(stderr, "%s does not support streaming i/o\n", + dev_name); + exit(EXIT_FAILURE); + } + break; + } + + + /* Select video input, video standard and tune here. */ + + + CLEAR(cropcap); + + cropcap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + + if (0 == xioctl(fd, VIDIOC_CROPCAP, &cropcap)) { + crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + crop.c = cropcap.defrect; /* reset to default */ + + if (-1 == xioctl(fd, VIDIOC_S_CROP, &crop)) { + switch (errno) { + case EINVAL: + /* Cropping not supported. */ + break; + default: + /* Errors ignored. */ + break; + } + } + } else { + /* Errors ignored. */ + } + + + CLEAR(fmt); + + fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + if (force_format) { + fmt.fmt.pix.width = 640; + fmt.fmt.pix.height = 480; + fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV; + fmt.fmt.pix.field = V4L2_FIELD_INTERLACED; + + if (-1 == xioctl(fd, VIDIOC_S_FMT, &fmt)) + errno_exit("VIDIOC_S_FMT"); + + /* Note VIDIOC_S_FMT may change width and height. */ + } else { + /* Preserve original settings as set by v4l2-ctl for example */ + if (-1 == xioctl(fd, VIDIOC_G_FMT, &fmt)) + errno_exit("VIDIOC_G_FMT"); + } + + /* Buggy driver paranoia. */ + min = fmt.fmt.pix.width * 2; + if (fmt.fmt.pix.bytesperline < min) + fmt.fmt.pix.bytesperline = min; + min = fmt.fmt.pix.bytesperline * fmt.fmt.pix.height; + if (fmt.fmt.pix.sizeimage < min) + fmt.fmt.pix.sizeimage = min; + + switch (io) { + case IO_METHOD_READ: + init_read(fmt.fmt.pix.sizeimage); + break; + + case IO_METHOD_MMAP: + init_mmap(); + break; + + case IO_METHOD_USERPTR: + init_userp(fmt.fmt.pix.sizeimage); + break; + } +} + +static void close_device(void) +{ + if (-1 == close(fd)) + errno_exit("close"); + + fd = -1; +} + +static void open_device(void) +{ + struct stat st; + + if (-1 == stat(dev_name, &st)) { + fprintf(stderr, "Cannot identify '%s': %d, %s\n", + dev_name, errno, strerror(errno)); + exit(EXIT_FAILURE); + } + + if (!S_ISCHR(st.st_mode)) { + fprintf(stderr, "%s is no device\n", dev_name); + exit(EXIT_FAILURE); + } + + fd = open(dev_name, O_RDWR /* required */ | O_NONBLOCK, 0); + + if (-1 == fd) { + fprintf(stderr, "Cannot open '%s': %d, %s\n", + dev_name, errno, strerror(errno)); + exit(EXIT_FAILURE); + } +} + +static void usage(FILE *fp, int argc, char **argv) +{ + fprintf(fp, + "Usage: %s [options]\n\n" + "Version 1.3\n" + "Options:\n" + "-d | --device name Video device name [%s]\n" + "-h | --help Print this message\n" + "-m | --mmap Use memory mapped buffers [default]\n" + "-r | --read Use read() calls\n" + "-u | --userp Use application allocated buffers\n" + "-o | --output Outputs stream to stdout\n" + "-f | --format Force format to 640x480 YUYV\n" + "-c | --count Number of frames to grab [%i]\n" + "", + argv[0], dev_name, frame_count); +} + +static const char short_options[] = "d:hmruofc:"; + +static const struct option +long_options[] = { + { "device", required_argument, NULL, 'd' }, + { "help", no_argument, NULL, 'h' }, + { "mmap", no_argument, NULL, 'm' }, + { "read", no_argument, NULL, 'r' }, + { "userp", no_argument, NULL, 'u' }, + { "output", no_argument, NULL, 'o' }, + { "format", no_argument, NULL, 'f' }, + { "count", required_argument, NULL, 'c' }, + { 0, 0, 0, 0 } +}; + +int main(int argc, char **argv) +{ + dev_name = "/dev/video0"; + + for (;;) { + int idx; + int c; + + c = getopt_long(argc, argv, + short_options, long_options, &idx); + + if (-1 == c) + break; + + switch (c) { + case 0: /* getopt_long() flag */ + break; + + case 'd': + dev_name = optarg; + break; + + case 'h': + usage(stdout, argc, argv); + exit(EXIT_SUCCESS); + + case 'm': + io = IO_METHOD_MMAP; + break; + + case 'r': + io = IO_METHOD_READ; + break; + + case 'u': + io = IO_METHOD_USERPTR; + break; + + case 'o': + out_buf++; + break; + + case 'f': + force_format++; + break; + + case 'c': + errno = 0; + frame_count = strtol(optarg, NULL, 0); + if (errno) + errno_exit(optarg); + break; + + default: + usage(stderr, argc, argv); + exit(EXIT_FAILURE); + } + } + + open_device(); + init_device(); + start_capturing(); + mainloop(); + stop_capturing(); + uninit_device(); + close_device(); + fprintf(stderr, "\n"); + return 0; +} +</programlisting> diff --git a/Documentation/DocBook/media/v4l/common.xml b/Documentation/DocBook/media/v4l/common.xml new file mode 100644 index 00000000000..71f6bf9e735 --- /dev/null +++ b/Documentation/DocBook/media/v4l/common.xml @@ -0,0 +1,1102 @@ + <title>Common API Elements</title> + + <para>Programming a V4L2 device consists of these +steps:</para> + + <itemizedlist> + <listitem> + <para>Opening the device</para> + </listitem> + <listitem> + <para>Changing device properties, selecting a video and audio +input, video standard, picture brightness a. o.</para> + </listitem> + <listitem> + <para>Negotiating a data format</para> + </listitem> + <listitem> + <para>Negotiating an input/output method</para> + </listitem> + <listitem> + <para>The actual input/output loop</para> + </listitem> + <listitem> + <para>Closing the device</para> + </listitem> + </itemizedlist> + + <para>In practice most steps are optional and can be executed out of +order. It depends on the V4L2 device type, you can read about the +details in <xref linkend="devices" />. In this chapter we will discuss +the basic concepts applicable to all devices.</para> + + <section id="open"> + <title>Opening and Closing Devices</title> + + <section> + <title>Device Naming</title> + + <para>V4L2 drivers are implemented as kernel modules, loaded +manually by the system administrator or automatically when a device is +first discovered. The driver modules plug into the "videodev" kernel +module. It provides helper functions and a common application +interface specified in this document.</para> + + <para>Each driver thus loaded registers one or more device nodes +with major number 81 and a minor number between 0 and 255. Minor numbers +are allocated dynamically unless the kernel is compiled with the kernel +option CONFIG_VIDEO_FIXED_MINOR_RANGES. In that case minor numbers are +allocated in ranges depending on the device node type (video, radio, etc.).</para> + + <para>Many drivers support "video_nr", "radio_nr" or "vbi_nr" +module options to select specific video/radio/vbi node numbers. This allows +the user to request that the device node is named e.g. /dev/video5 instead +of leaving it to chance. When the driver supports multiple devices of the same +type more than one device node number can be assigned, separated by commas: + <informalexample> + <screen> +> modprobe mydriver video_nr=0,1 radio_nr=0,1</screen> + </informalexample></para> + + <para>In <filename>/etc/modules.conf</filename> this may be +written as: <informalexample> + <screen> +options mydriver video_nr=0,1 radio_nr=0,1 + </screen> + </informalexample> When no device node number is given as module +option the driver supplies a default.</para> + + <para>Normally udev will create the device nodes in /dev automatically +for you. If udev is not installed, then you need to enable the +CONFIG_VIDEO_FIXED_MINOR_RANGES kernel option in order to be able to correctly +relate a minor number to a device node number. I.e., you need to be certain +that minor number 5 maps to device node name video5. With this kernel option +different device types have different minor number ranges. These ranges are +listed in <xref linkend="devices" />. +</para> + + <para>The creation of character special files (with +<application>mknod</application>) is a privileged operation and +devices cannot be opened by major and minor number. That means +applications cannot <emphasis>reliable</emphasis> scan for loaded or +installed drivers. The user must enter a device name, or the +application can try the conventional device names.</para> + </section> + + <section id="related"> + <title>Related Devices</title> + + <para>Devices can support several functions. For example +video capturing, VBI capturing and radio support.</para> + + <para>The V4L2 API creates different nodes for each of these functions.</para> + + <para>The V4L2 API was designed with the idea that one device node could support +all functions. However, in practice this never worked: this 'feature' +was never used by applications and many drivers did not support it and if +they did it was certainly never tested. In addition, switching a device +node between different functions only works when using the streaming I/O +API, not with the read()/write() API.</para> + + <para>Today each device node supports just one function.</para> + + <para>Besides video input or output the hardware may also +support audio sampling or playback. If so, these functions are +implemented as ALSA PCM devices with optional ALSA audio mixer +devices.</para> + + <para>One problem with all these devices is that the V4L2 API +makes no provisions to find these related devices. Some really +complex devices use the Media Controller (see <xref linkend="media_controller" />) +which can be used for this purpose. But most drivers do not use it, +and while some code exists that uses sysfs to discover related devices +(see libmedia_dev in the <ulink url="http://git.linuxtv.org/v4l-utils/">v4l-utils</ulink> +git repository), there is no library yet that can provide a single API towards +both Media Controller-based devices and devices that do not use the Media Controller. +If you want to work on this please write to the linux-media mailing list: &v4l-ml;.</para> + </section> + + <section> + <title>Multiple Opens</title> + + <para>V4L2 devices can be opened more than once.<footnote><para> +There are still some old and obscure drivers that have not been updated to +allow for multiple opens. This implies that for such drivers &func-open; can +return an &EBUSY; when the device is already in use.</para></footnote> +When this is supported by the driver, users can for example start a +"panel" application to change controls like brightness or audio +volume, while another application captures video and audio. In other words, panel +applications are comparable to an ALSA audio mixer application. +Just opening a V4L2 device should not change the state of the device.<footnote> +<para>Unfortunately, opening a radio device often switches the state of the +device to radio mode in many drivers. This behavior should be fixed eventually +as it violates the V4L2 specification.</para></footnote></para> + + <para>Once an application has allocated the memory buffers needed for +streaming data (by calling the &VIDIOC-REQBUFS; or &VIDIOC-CREATE-BUFS; ioctls, +or implicitly by calling the &func-read; or &func-write; functions) that +application (filehandle) becomes the owner of the device. It is no longer +allowed to make changes that would affect the buffer sizes (e.g. by calling +the &VIDIOC-S-FMT; ioctl) and other applications are no longer allowed to allocate +buffers or start or stop streaming. The &EBUSY; will be returned instead.</para> + + <para>Merely opening a V4L2 device does not grant exclusive +access.<footnote> + <para>Drivers could recognize the +<constant>O_EXCL</constant> open flag. Presently this is not required, +so applications cannot know if it really works.</para> + </footnote> Initiating data exchange however assigns the right +to read or write the requested type of data, and to change related +properties, to this file descriptor. Applications can request +additional access privileges using the priority mechanism described in +<xref linkend="app-pri" />.</para> + </section> + + <section> + <title>Shared Data Streams</title> + + <para>V4L2 drivers should not support multiple applications +reading or writing the same data stream on a device by copying +buffers, time multiplexing or similar means. This is better handled by +a proxy application in user space.</para> + </section> + + <section> + <title>Functions</title> + + <para>To open and close V4L2 devices applications use the +&func-open; and &func-close; function, respectively. Devices are +programmed using the &func-ioctl; function as explained in the +following sections.</para> + </section> + </section> + + <section id="querycap"> + <title>Querying Capabilities</title> + + <para>Because V4L2 covers a wide variety of devices not all +aspects of the API are equally applicable to all types of devices. +Furthermore devices of the same type have different capabilities and +this specification permits the omission of a few complicated and less +important parts of the API.</para> + + <para>The &VIDIOC-QUERYCAP; ioctl is available to check if the kernel +device is compatible with this specification, and to query the <link +linkend="devices">functions</link> and <link linkend="io">I/O +methods</link> supported by the device.</para> + + <para>Starting with kernel version 3.1, VIDIOC-QUERYCAP will return the +V4L2 API version used by the driver, with generally matches the Kernel version. +There's no need of using &VIDIOC-QUERYCAP; to check if a specific ioctl is +supported, the V4L2 core now returns ENOTTY if a driver doesn't provide +support for an ioctl.</para> + + <para>Other features can be queried +by calling the respective ioctl, for example &VIDIOC-ENUMINPUT; +to learn about the number, types and names of video connectors on the +device. Although abstraction is a major objective of this API, the +&VIDIOC-QUERYCAP; ioctl also allows driver specific applications to reliably identify +the driver.</para> + + <para>All V4L2 drivers must support +<constant>VIDIOC_QUERYCAP</constant>. Applications should always call +this ioctl after opening the device.</para> + </section> + + <section id="app-pri"> + <title>Application Priority</title> + + <para>When multiple applications share a device it may be +desirable to assign them different priorities. Contrary to the +traditional "rm -rf /" school of thought a video recording application +could for example block other applications from changing video +controls or switching the current TV channel. Another objective is to +permit low priority applications working in background, which can be +preempted by user controlled applications and automatically regain +control of the device at a later time.</para> + + <para>Since these features cannot be implemented entirely in user +space V4L2 defines the &VIDIOC-G-PRIORITY; and &VIDIOC-S-PRIORITY; +ioctls to request and query the access priority associate with a file +descriptor. Opening a device assigns a medium priority, compatible +with earlier versions of V4L2 and drivers not supporting these ioctls. +Applications requiring a different priority will usually call +<constant>VIDIOC_S_PRIORITY</constant> after verifying the device with +the &VIDIOC-QUERYCAP; ioctl.</para> + + <para>Ioctls changing driver properties, such as &VIDIOC-S-INPUT;, +return an &EBUSY; after another application obtained higher priority.</para> + </section> + + <section id="video"> + <title>Video Inputs and Outputs</title> + + <para>Video inputs and outputs are physical connectors of a +device. These can be for example RF connectors (antenna/cable), CVBS +a.k.a. Composite Video, S-Video or RGB connectors. Video and VBI +capture devices have inputs. Video and VBI output devices have outputs, +at least one each. Radio devices have no video inputs or outputs.</para> + + <para>To learn about the number and attributes of the +available inputs and outputs applications can enumerate them with the +&VIDIOC-ENUMINPUT; and &VIDIOC-ENUMOUTPUT; ioctl, respectively. The +&v4l2-input; returned by the <constant>VIDIOC_ENUMINPUT</constant> +ioctl also contains signal status information applicable when the +current video input is queried.</para> + + <para>The &VIDIOC-G-INPUT; and &VIDIOC-G-OUTPUT; ioctls return the +index of the current video input or output. To select a different +input or output applications call the &VIDIOC-S-INPUT; and +&VIDIOC-S-OUTPUT; ioctls. Drivers must implement all the input ioctls +when the device has one or more inputs, all the output ioctls when the +device has one or more outputs.</para> + + <example> + <title>Information about the current video input</title> + + <programlisting> +&v4l2-input; input; +int index; + +if (-1 == ioctl(fd, &VIDIOC-G-INPUT;, &index)) { + perror("VIDIOC_G_INPUT"); + exit(EXIT_FAILURE); +} + +memset(&input, 0, sizeof(input)); +input.index = index; + +if (-1 == ioctl(fd, &VIDIOC-ENUMINPUT;, &input)) { + perror("VIDIOC_ENUMINPUT"); + exit(EXIT_FAILURE); +} + +printf("Current input: %s\n", input.name); + </programlisting> + </example> + + <example> + <title>Switching to the first video input</title> + + <programlisting> +int index; + +index = 0; + +if (-1 == ioctl(fd, &VIDIOC-S-INPUT;, &index)) { + perror("VIDIOC_S_INPUT"); + exit(EXIT_FAILURE); +} + </programlisting> + </example> + </section> + + <section id="audio"> + <title>Audio Inputs and Outputs</title> + + <para>Audio inputs and outputs are physical connectors of a +device. Video capture devices have inputs, output devices have +outputs, zero or more each. Radio devices have no audio inputs or +outputs. They have exactly one tuner which in fact +<emphasis>is</emphasis> an audio source, but this API associates +tuners with video inputs or outputs only, and radio devices have +none of these.<footnote> + <para>Actually &v4l2-audio; ought to have a +<structfield>tuner</structfield> field like &v4l2-input;, not only +making the API more consistent but also permitting radio devices with +multiple tuners.</para> + </footnote> A connector on a TV card to loop back the received +audio signal to a sound card is not considered an audio output.</para> + + <para>Audio and video inputs and outputs are associated. Selecting +a video source also selects an audio source. This is most evident when +the video and audio source is a tuner. Further audio connectors can +combine with more than one video input or output. Assumed two +composite video inputs and two audio inputs exist, there may be up to +four valid combinations. The relation of video and audio connectors +is defined in the <structfield>audioset</structfield> field of the +respective &v4l2-input; or &v4l2-output;, where each bit represents +the index number, starting at zero, of one audio input or output.</para> + + <para>To learn about the number and attributes of the +available inputs and outputs applications can enumerate them with the +&VIDIOC-ENUMAUDIO; and &VIDIOC-ENUMAUDOUT; ioctl, respectively. The +&v4l2-audio; returned by the <constant>VIDIOC_ENUMAUDIO</constant> ioctl +also contains signal status information applicable when the current +audio input is queried.</para> + + <para>The &VIDIOC-G-AUDIO; and &VIDIOC-G-AUDOUT; ioctls report +the current audio input and output, respectively. Note that, unlike +&VIDIOC-G-INPUT; and &VIDIOC-G-OUTPUT; these ioctls return a structure +as <constant>VIDIOC_ENUMAUDIO</constant> and +<constant>VIDIOC_ENUMAUDOUT</constant> do, not just an index.</para> + + <para>To select an audio input and change its properties +applications call the &VIDIOC-S-AUDIO; ioctl. To select an audio +output (which presently has no changeable properties) applications +call the &VIDIOC-S-AUDOUT; ioctl.</para> + + <para>Drivers must implement all audio input ioctls when the device +has multiple selectable audio inputs, all audio output ioctls when the +device has multiple selectable audio outputs. When the device has any +audio inputs or outputs the driver must set the <constant>V4L2_CAP_AUDIO</constant> +flag in the &v4l2-capability; returned by the &VIDIOC-QUERYCAP; ioctl.</para> + + <example> + <title>Information about the current audio input</title> + + <programlisting> +&v4l2-audio; audio; + +memset(&audio, 0, sizeof(audio)); + +if (-1 == ioctl(fd, &VIDIOC-G-AUDIO;, &audio)) { + perror("VIDIOC_G_AUDIO"); + exit(EXIT_FAILURE); +} + +printf("Current input: %s\n", audio.name); + </programlisting> + </example> + + <example> + <title>Switching to the first audio input</title> + + <programlisting> +&v4l2-audio; audio; + +memset(&audio, 0, sizeof(audio)); /* clear audio.mode, audio.reserved */ + +audio.index = 0; + +if (-1 == ioctl(fd, &VIDIOC-S-AUDIO;, &audio)) { + perror("VIDIOC_S_AUDIO"); + exit(EXIT_FAILURE); +} + </programlisting> + </example> + </section> + + <section id="tuner"> + <title>Tuners and Modulators</title> + + <section> + <title>Tuners</title> + + <para>Video input devices can have one or more tuners +demodulating a RF signal. Each tuner is associated with one or more +video inputs, depending on the number of RF connectors on the tuner. +The <structfield>type</structfield> field of the respective +&v4l2-input; returned by the &VIDIOC-ENUMINPUT; ioctl is set to +<constant>V4L2_INPUT_TYPE_TUNER</constant> and its +<structfield>tuner</structfield> field contains the index number of +the tuner.</para> + + <para>Radio input devices have exactly one tuner with index zero, no +video inputs.</para> + + <para>To query and change tuner properties applications use the +&VIDIOC-G-TUNER; and &VIDIOC-S-TUNER; ioctls, respectively. The +&v4l2-tuner; returned by <constant>VIDIOC_G_TUNER</constant> also +contains signal status information applicable when the tuner of the +current video or radio input is queried. Note that +<constant>VIDIOC_S_TUNER</constant> does not switch the current tuner, +when there is more than one at all. The tuner is solely determined by +the current video input. Drivers must support both ioctls and set the +<constant>V4L2_CAP_TUNER</constant> flag in the &v4l2-capability; +returned by the &VIDIOC-QUERYCAP; ioctl when the device has one or +more tuners.</para> + </section> + + <section> + <title>Modulators</title> + + <para>Video output devices can have one or more modulators, uh, +modulating a video signal for radiation or connection to the antenna +input of a TV set or video recorder. Each modulator is associated with +one or more video outputs, depending on the number of RF connectors on +the modulator. The <structfield>type</structfield> field of the +respective &v4l2-output; returned by the &VIDIOC-ENUMOUTPUT; ioctl is +set to <constant>V4L2_OUTPUT_TYPE_MODULATOR</constant> and its +<structfield>modulator</structfield> field contains the index number +of the modulator.</para> + + <para>Radio output devices have exactly one modulator with index +zero, no video outputs.</para> + + <para>A video or radio device cannot support both a tuner and a +modulator. Two separate device nodes will have to be used for such +hardware, one that supports the tuner functionality and one that supports +the modulator functionality. The reason is a limitation with the +&VIDIOC-S-FREQUENCY; ioctl where you cannot specify whether the frequency +is for a tuner or a modulator.</para> + + <para>To query and change modulator properties applications use +the &VIDIOC-G-MODULATOR; and &VIDIOC-S-MODULATOR; ioctl. Note that +<constant>VIDIOC_S_MODULATOR</constant> does not switch the current +modulator, when there is more than one at all. The modulator is solely +determined by the current video output. Drivers must support both +ioctls and set the <constant>V4L2_CAP_MODULATOR</constant> flag in +the &v4l2-capability; returned by the &VIDIOC-QUERYCAP; ioctl when the +device has one or more modulators.</para> + </section> + + <section> + <title>Radio Frequency</title> + + <para>To get and set the tuner or modulator radio frequency +applications use the &VIDIOC-G-FREQUENCY; and &VIDIOC-S-FREQUENCY; +ioctl which both take a pointer to a &v4l2-frequency;. These ioctls +are used for TV and radio devices alike. Drivers must support both +ioctls when the tuner or modulator ioctls are supported, or +when the device is a radio device.</para> + </section> + </section> + + <section id="standard"> + <title>Video Standards</title> + + <para>Video devices typically support one or more different video +standards or variations of standards. Each video input and output may +support another set of standards. This set is reported by the +<structfield>std</structfield> field of &v4l2-input; and +&v4l2-output; returned by the &VIDIOC-ENUMINPUT; and +&VIDIOC-ENUMOUTPUT; ioctls, respectively.</para> + + <para>V4L2 defines one bit for each analog video standard +currently in use worldwide, and sets aside bits for driver defined +standards, ⪚ hybrid standards to watch NTSC video tapes on PAL TVs +and vice versa. Applications can use the predefined bits to select a +particular standard, although presenting the user a menu of supported +standards is preferred. To enumerate and query the attributes of the +supported standards applications use the &VIDIOC-ENUMSTD; ioctl.</para> + + <para>Many of the defined standards are actually just variations +of a few major standards. The hardware may in fact not distinguish +between them, or do so internal and switch automatically. Therefore +enumerated standards also contain sets of one or more standard +bits.</para> + + <para>Assume a hypothetic tuner capable of demodulating B/PAL, +G/PAL and I/PAL signals. The first enumerated standard is a set of B +and G/PAL, switched automatically depending on the selected radio +frequency in UHF or VHF band. Enumeration gives a "PAL-B/G" or "PAL-I" +choice. Similar a Composite input may collapse standards, enumerating +"PAL-B/G/H/I", "NTSC-M" and "SECAM-D/K".<footnote> + <para>Some users are already confused by technical terms PAL, +NTSC and SECAM. There is no point asking them to distinguish between +B, G, D, or K when the software or hardware can do that +automatically.</para> + </footnote></para> + + <para>To query and select the standard used by the current video +input or output applications call the &VIDIOC-G-STD; and +&VIDIOC-S-STD; ioctl, respectively. The <emphasis>received</emphasis> +standard can be sensed with the &VIDIOC-QUERYSTD; ioctl. Note that the +parameter of all these ioctls is a pointer to a &v4l2-std-id; type +(a standard set), <emphasis>not</emphasis> an index into the standard +enumeration. Drivers must implement all video standard ioctls +when the device has one or more video inputs or outputs.</para> + + <para>Special rules apply to devices such as USB cameras where the notion of video +standards makes little sense. More generally for any capture or output device +which is: <itemizedlist> + <listitem> + <para>incapable of capturing fields or frames at the nominal +rate of the video standard, or</para> + </listitem> + <listitem> + <para>that does not support the video standard formats at all.</para> + </listitem> + </itemizedlist> Here the driver shall set the +<structfield>std</structfield> field of &v4l2-input; and &v4l2-output; +to zero and the <constant>VIDIOC_G_STD</constant>, +<constant>VIDIOC_S_STD</constant>, +<constant>VIDIOC_QUERYSTD</constant> and +<constant>VIDIOC_ENUMSTD</constant> ioctls shall return the +&ENOTTY; or the &EINVAL;.</para> + <para>Applications can make use of the <xref linkend="input-capabilities" /> and +<xref linkend="output-capabilities"/> flags to determine whether the video standard ioctls +can be used with the given input or output.</para> + + <example> + <title>Information about the current video standard</title> + + <programlisting> +&v4l2-std-id; std_id; +&v4l2-standard; standard; + +if (-1 == ioctl(fd, &VIDIOC-G-STD;, &std_id)) { + /* Note when VIDIOC_ENUMSTD always returns ENOTTY this + is no video device or it falls under the USB exception, + and VIDIOC_G_STD returning ENOTTY is no error. */ + + perror("VIDIOC_G_STD"); + exit(EXIT_FAILURE); +} + +memset(&standard, 0, sizeof(standard)); +standard.index = 0; + +while (0 == ioctl(fd, &VIDIOC-ENUMSTD;, &standard)) { + if (standard.id & std_id) { + printf("Current video standard: %s\n", standard.name); + exit(EXIT_SUCCESS); + } + + standard.index++; +} + +/* EINVAL indicates the end of the enumeration, which cannot be + empty unless this device falls under the USB exception. */ + +if (errno == EINVAL || standard.index == 0) { + perror("VIDIOC_ENUMSTD"); + exit(EXIT_FAILURE); +} + </programlisting> + </example> + + <example> + <title>Listing the video standards supported by the current +input</title> + + <programlisting> +&v4l2-input; input; +&v4l2-standard; standard; + +memset(&input, 0, sizeof(input)); + +if (-1 == ioctl(fd, &VIDIOC-G-INPUT;, &input.index)) { + perror("VIDIOC_G_INPUT"); + exit(EXIT_FAILURE); +} + +if (-1 == ioctl(fd, &VIDIOC-ENUMINPUT;, &input)) { + perror("VIDIOC_ENUM_INPUT"); + exit(EXIT_FAILURE); +} + +printf("Current input %s supports:\n", input.name); + +memset(&standard, 0, sizeof(standard)); +standard.index = 0; + +while (0 == ioctl(fd, &VIDIOC-ENUMSTD;, &standard)) { + if (standard.id & input.std) + printf("%s\n", standard.name); + + standard.index++; +} + +/* EINVAL indicates the end of the enumeration, which cannot be + empty unless this device falls under the USB exception. */ + +if (errno != EINVAL || standard.index == 0) { + perror("VIDIOC_ENUMSTD"); + exit(EXIT_FAILURE); +} + </programlisting> + </example> + + <example> + <title>Selecting a new video standard</title> + + <programlisting> +&v4l2-input; input; +&v4l2-std-id; std_id; + +memset(&input, 0, sizeof(input)); + +if (-1 == ioctl(fd, &VIDIOC-G-INPUT;, &input.index)) { + perror("VIDIOC_G_INPUT"); + exit(EXIT_FAILURE); +} + +if (-1 == ioctl(fd, &VIDIOC-ENUMINPUT;, &input)) { + perror("VIDIOC_ENUM_INPUT"); + exit(EXIT_FAILURE); +} + +if (0 == (input.std & V4L2_STD_PAL_BG)) { + fprintf(stderr, "Oops. B/G PAL is not supported.\n"); + exit(EXIT_FAILURE); +} + +/* Note this is also supposed to work when only B + <emphasis>or</emphasis> G/PAL is supported. */ + +std_id = V4L2_STD_PAL_BG; + +if (-1 == ioctl(fd, &VIDIOC-S-STD;, &std_id)) { + perror("VIDIOC_S_STD"); + exit(EXIT_FAILURE); +} + </programlisting> + </example> + </section> + <section id="dv-timings"> + <title>Digital Video (DV) Timings</title> + <para> + The video standards discussed so far have been dealing with Analog TV and the +corresponding video timings. Today there are many more different hardware interfaces +such as High Definition TV interfaces (HDMI), VGA, DVI connectors etc., that carry +video signals and there is a need to extend the API to select the video timings +for these interfaces. Since it is not possible to extend the &v4l2-std-id; due to +the limited bits available, a new set of ioctls was added to set/get video timings at +the input and output.</para> + + <para>These ioctls deal with the detailed digital video timings that define +each video format. This includes parameters such as the active video width and height, +signal polarities, frontporches, backporches, sync widths etc. The <filename>linux/v4l2-dv-timings.h</filename> +header can be used to get the timings of the formats in the <xref linkend="cea861" /> and +<xref linkend="vesadmt" /> standards. + </para> + + <para>To enumerate and query the attributes of the DV timings supported by a device + applications use the &VIDIOC-ENUM-DV-TIMINGS; and &VIDIOC-DV-TIMINGS-CAP; ioctls. + To set DV timings for the device applications use the +&VIDIOC-S-DV-TIMINGS; ioctl and to get current DV timings they use the +&VIDIOC-G-DV-TIMINGS; ioctl. To detect the DV timings as seen by the video receiver applications +use the &VIDIOC-QUERY-DV-TIMINGS; ioctl.</para> + <para>Applications can make use of the <xref linkend="input-capabilities" /> and +<xref linkend="output-capabilities"/> flags to determine whether the digital video ioctls +can be used with the given input or output.</para> + </section> + + &sub-controls; + + <section id="format"> + <title>Data Formats</title> + + <section> + <title>Data Format Negotiation</title> + + <para>Different devices exchange different kinds of data with +applications, for example video images, raw or sliced VBI data, RDS +datagrams. Even within one kind many different formats are possible, +in particular an abundance of image formats. Although drivers must +provide a default and the selection persists across closing and +reopening a device, applications should always negotiate a data format +before engaging in data exchange. Negotiation means the application +asks for a particular format and the driver selects and reports the +best the hardware can do to satisfy the request. Of course +applications can also just query the current selection.</para> + + <para>A single mechanism exists to negotiate all data formats +using the aggregate &v4l2-format; and the &VIDIOC-G-FMT; and +&VIDIOC-S-FMT; ioctls. Additionally the &VIDIOC-TRY-FMT; ioctl can be +used to examine what the hardware <emphasis>could</emphasis> do, +without actually selecting a new data format. The data formats +supported by the V4L2 API are covered in the respective device section +in <xref linkend="devices" />. For a closer look at image formats see +<xref linkend="pixfmt" />.</para> + + <para>The <constant>VIDIOC_S_FMT</constant> ioctl is a major +turning-point in the initialization sequence. Prior to this point +multiple panel applications can access the same device concurrently to +select the current input, change controls or modify other properties. +The first <constant>VIDIOC_S_FMT</constant> assigns a logical stream +(video data, VBI data etc.) exclusively to one file descriptor.</para> + + <para>Exclusive means no other application, more precisely no +other file descriptor, can grab this stream or change device +properties inconsistent with the negotiated parameters. A video +standard change for example, when the new standard uses a different +number of scan lines, can invalidate the selected image format. +Therefore only the file descriptor owning the stream can make +invalidating changes. Accordingly multiple file descriptors which +grabbed different logical streams prevent each other from interfering +with their settings. When for example video overlay is about to start +or already in progress, simultaneous video capturing may be restricted +to the same cropping and image size.</para> + + <para>When applications omit the +<constant>VIDIOC_S_FMT</constant> ioctl its locking side effects are +implied by the next step, the selection of an I/O method with the +&VIDIOC-REQBUFS; ioctl or implicit with the first &func-read; or +&func-write; call.</para> + + <para>Generally only one logical stream can be assigned to a +file descriptor, the exception being drivers permitting simultaneous +video capturing and overlay using the same file descriptor for +compatibility with V4L and earlier versions of V4L2. Switching the +logical stream or returning into "panel mode" is possible by closing +and reopening the device. Drivers <emphasis>may</emphasis> support a +switch using <constant>VIDIOC_S_FMT</constant>.</para> + + <para>All drivers exchanging data with +applications must support the <constant>VIDIOC_G_FMT</constant> and +<constant>VIDIOC_S_FMT</constant> ioctl. Implementation of the +<constant>VIDIOC_TRY_FMT</constant> is highly recommended but +optional.</para> + </section> + + <section> + <title>Image Format Enumeration</title> + + <para>Apart of the generic format negotiation functions +a special ioctl to enumerate all image formats supported by video +capture, overlay or output devices is available.<footnote> + <para>Enumerating formats an application has no a-priori +knowledge of (otherwise it could explicitly ask for them and need not +enumerate) seems useless, but there are applications serving as proxy +between drivers and the actual video applications for which this is +useful.</para> + </footnote></para> + + <para>The &VIDIOC-ENUM-FMT; ioctl must be supported +by all drivers exchanging image data with applications.</para> + + <important> + <para>Drivers are not supposed to convert image formats in +kernel space. They must enumerate only formats directly supported by +the hardware. If necessary driver writers should publish an example +conversion routine or library for integration into applications.</para> + </important> + </section> + </section> + + &sub-planar-apis; + + <section id="crop"> + <title>Image Cropping, Insertion and Scaling</title> + + <para>Some video capture devices can sample a subsection of the +picture and shrink or enlarge it to an image of arbitrary size. We +call these abilities cropping and scaling. Some video output devices +can scale an image up or down and insert it at an arbitrary scan line +and horizontal offset into a video signal.</para> + + <para>Applications can use the following API to select an area in +the video signal, query the default area and the hardware limits. +<emphasis>Despite their name, the &VIDIOC-CROPCAP;, &VIDIOC-G-CROP; +and &VIDIOC-S-CROP; ioctls apply to input as well as output +devices.</emphasis></para> + + <para>Scaling requires a source and a target. On a video capture +or overlay device the source is the video signal, and the cropping +ioctls determine the area actually sampled. The target are images +read by the application or overlaid onto the graphics screen. Their +size (and position for an overlay) is negotiated with the +&VIDIOC-G-FMT; and &VIDIOC-S-FMT; ioctls.</para> + + <para>On a video output device the source are the images passed in +by the application, and their size is again negotiated with the +<constant>VIDIOC_G/S_FMT</constant> ioctls, or may be encoded in a +compressed video stream. The target is the video signal, and the +cropping ioctls determine the area where the images are +inserted.</para> + + <para>Source and target rectangles are defined even if the device +does not support scaling or the <constant>VIDIOC_G/S_CROP</constant> +ioctls. Their size (and position where applicable) will be fixed in +this case. <emphasis>All capture and output device must support the +<constant>VIDIOC_CROPCAP</constant> ioctl such that applications can +determine if scaling takes place.</emphasis></para> + + <section> + <title>Cropping Structures</title> + + <figure id="crop-scale"> + <title>Image Cropping, Insertion and Scaling</title> + <mediaobject> + <imageobject> + <imagedata fileref="crop.pdf" format="PS" /> + </imageobject> + <imageobject> + <imagedata fileref="crop.gif" format="GIF" /> + </imageobject> + <textobject> + <phrase>The cropping, insertion and scaling process</phrase> + </textobject> + </mediaobject> + </figure> + + <para>For capture devices the coordinates of the top left +corner, width and height of the area which can be sampled is given by +the <structfield>bounds</structfield> substructure of the +&v4l2-cropcap; returned by the <constant>VIDIOC_CROPCAP</constant> +ioctl. To support a wide range of hardware this specification does not +define an origin or units. However by convention drivers should +horizontally count unscaled samples relative to 0H (the leading edge +of the horizontal sync pulse, see <xref linkend="vbi-hsync" />). +Vertically ITU-R line +numbers of the first field (<xref linkend="vbi-525" />, <xref +linkend="vbi-625" />), multiplied by two if the driver can capture both +fields.</para> + + <para>The top left corner, width and height of the source +rectangle, that is the area actually sampled, is given by &v4l2-crop; +using the same coordinate system as &v4l2-cropcap;. Applications can +use the <constant>VIDIOC_G_CROP</constant> and +<constant>VIDIOC_S_CROP</constant> ioctls to get and set this +rectangle. It must lie completely within the capture boundaries and +the driver may further adjust the requested size and/or position +according to hardware limitations.</para> + + <para>Each capture device has a default source rectangle, given +by the <structfield>defrect</structfield> substructure of +&v4l2-cropcap;. The center of this rectangle shall align with the +center of the active picture area of the video signal, and cover what +the driver writer considers the complete picture. Drivers shall reset +the source rectangle to the default when the driver is first loaded, +but not later.</para> + + <para>For output devices these structures and ioctls are used +accordingly, defining the <emphasis>target</emphasis> rectangle where +the images will be inserted into the video signal.</para> + + </section> + + <section> + <title>Scaling Adjustments</title> + + <para>Video hardware can have various cropping, insertion and +scaling limitations. It may only scale up or down, support only +discrete scaling factors, or have different scaling abilities in +horizontal and vertical direction. Also it may not support scaling at +all. At the same time the &v4l2-crop; rectangle may have to be +aligned, and both the source and target rectangles may have arbitrary +upper and lower size limits. In particular the maximum +<structfield>width</structfield> and <structfield>height</structfield> +in &v4l2-crop; may be smaller than the +&v4l2-cropcap;.<structfield>bounds</structfield> area. Therefore, as +usual, drivers are expected to adjust the requested parameters and +return the actual values selected.</para> + + <para>Applications can change the source or the target rectangle +first, as they may prefer a particular image size or a certain area in +the video signal. If the driver has to adjust both to satisfy hardware +limitations, the last requested rectangle shall take priority, and the +driver should preferably adjust the opposite one. The &VIDIOC-TRY-FMT; +ioctl however shall not change the driver state and therefore only +adjust the requested rectangle.</para> + + <para>Suppose scaling on a video capture device is restricted to +a factor 1:1 or 2:1 in either direction and the target image size must +be a multiple of 16 × 16 pixels. The source cropping +rectangle is set to defaults, which are also the upper limit in this +example, of 640 × 400 pixels at offset 0, 0. An +application requests an image size of 300 × 225 +pixels, assuming video will be scaled down from the "full picture" +accordingly. The driver sets the image size to the closest possible +values 304 × 224, then chooses the cropping rectangle +closest to the requested size, that is 608 × 224 +(224 × 2:1 would exceed the limit 400). The offset +0, 0 is still valid, thus unmodified. Given the default cropping +rectangle reported by <constant>VIDIOC_CROPCAP</constant> the +application can easily propose another offset to center the cropping +rectangle.</para> + + <para>Now the application may insist on covering an area using a +picture aspect ratio closer to the original request, so it asks for a +cropping rectangle of 608 × 456 pixels. The present +scaling factors limit cropping to 640 × 384, so the +driver returns the cropping size 608 × 384 and adjusts +the image size to closest possible 304 × 192.</para> + + </section> + + <section> + <title>Examples</title> + + <para>Source and target rectangles shall remain unchanged across +closing and reopening a device, such that piping data into or out of a +device will work without special preparations. More advanced +applications should ensure the parameters are suitable before starting +I/O.</para> + + <example> + <title>Resetting the cropping parameters</title> + + <para>(A video capture device is assumed; change +<constant>V4L2_BUF_TYPE_VIDEO_CAPTURE</constant> for other +devices.)</para> + + <programlisting> +&v4l2-cropcap; cropcap; +&v4l2-crop; crop; + +memset (&cropcap, 0, sizeof (cropcap)); +cropcap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + +if (-1 == ioctl (fd, &VIDIOC-CROPCAP;, &cropcap)) { + perror ("VIDIOC_CROPCAP"); + exit (EXIT_FAILURE); +} + +memset (&crop, 0, sizeof (crop)); +crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; +crop.c = cropcap.defrect; + +/* Ignore if cropping is not supported (EINVAL). */ + +if (-1 == ioctl (fd, &VIDIOC-S-CROP;, &crop) + && errno != EINVAL) { + perror ("VIDIOC_S_CROP"); + exit (EXIT_FAILURE); +} + </programlisting> + </example> + + <example> + <title>Simple downscaling</title> + + <para>(A video capture device is assumed.)</para> + + <programlisting> +&v4l2-cropcap; cropcap; +&v4l2-format; format; + +reset_cropping_parameters (); + +/* Scale down to 1/4 size of full picture. */ + +memset (&format, 0, sizeof (format)); /* defaults */ + +format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + +format.fmt.pix.width = cropcap.defrect.width >> 1; +format.fmt.pix.height = cropcap.defrect.height >> 1; +format.fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV; + +if (-1 == ioctl (fd, &VIDIOC-S-FMT;, &format)) { + perror ("VIDIOC_S_FORMAT"); + exit (EXIT_FAILURE); +} + +/* We could check the actual image size now, the actual scaling factor + or if the driver can scale at all. */ + </programlisting> + </example> + + <example> + <title>Selecting an output area</title> + + <programlisting> +&v4l2-cropcap; cropcap; +&v4l2-crop; crop; + +memset (&cropcap, 0, sizeof (cropcap)); +cropcap.type = V4L2_BUF_TYPE_VIDEO_OUTPUT; + +if (-1 == ioctl (fd, VIDIOC_CROPCAP;, &cropcap)) { + perror ("VIDIOC_CROPCAP"); + exit (EXIT_FAILURE); +} + +memset (&crop, 0, sizeof (crop)); + +crop.type = V4L2_BUF_TYPE_VIDEO_OUTPUT; +crop.c = cropcap.defrect; + +/* Scale the width and height to 50 % of their original size + and center the output. */ + +crop.c.width /= 2; +crop.c.height /= 2; +crop.c.left += crop.c.width / 2; +crop.c.top += crop.c.height / 2; + +/* Ignore if cropping is not supported (EINVAL). */ + +if (-1 == ioctl (fd, VIDIOC_S_CROP, &crop) + && errno != EINVAL) { + perror ("VIDIOC_S_CROP"); + exit (EXIT_FAILURE); +} +</programlisting> + </example> + + <example> + <title>Current scaling factor and pixel aspect</title> + + <para>(A video capture device is assumed.)</para> + + <programlisting> +&v4l2-cropcap; cropcap; +&v4l2-crop; crop; +&v4l2-format; format; +double hscale, vscale; +double aspect; +int dwidth, dheight; + +memset (&cropcap, 0, sizeof (cropcap)); +cropcap.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + +if (-1 == ioctl (fd, &VIDIOC-CROPCAP;, &cropcap)) { + perror ("VIDIOC_CROPCAP"); + exit (EXIT_FAILURE); +} + +memset (&crop, 0, sizeof (crop)); +crop.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + +if (-1 == ioctl (fd, &VIDIOC-G-CROP;, &crop)) { + if (errno != EINVAL) { + perror ("VIDIOC_G_CROP"); + exit (EXIT_FAILURE); + } + + /* Cropping not supported. */ + crop.c = cropcap.defrect; +} + +memset (&format, 0, sizeof (format)); +format.fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + +if (-1 == ioctl (fd, &VIDIOC-G-FMT;, &format)) { + perror ("VIDIOC_G_FMT"); + exit (EXIT_FAILURE); +} + +/* The scaling applied by the driver. */ + +hscale = format.fmt.pix.width / (double) crop.c.width; +vscale = format.fmt.pix.height / (double) crop.c.height; + +aspect = cropcap.pixelaspect.numerator / + (double) cropcap.pixelaspect.denominator; +aspect = aspect * hscale / vscale; + +/* Devices following ITU-R BT.601 do not capture + square pixels. For playback on a computer monitor + we should scale the images to this size. */ + +dwidth = format.fmt.pix.width / aspect; +dheight = format.fmt.pix.height; + </programlisting> + </example> + </section> + </section> + + &sub-selection-api; + + <section id="streaming-par"> + <title>Streaming Parameters</title> + + <para>Streaming parameters are intended to optimize the video +capture process as well as I/O. Presently applications can request a +high quality capture mode with the &VIDIOC-S-PARM; ioctl.</para> + + <para>The current video standard determines a nominal number of +frames per second. If less than this number of frames is to be +captured or output, applications can request frame skipping or +duplicating on the driver side. This is especially useful when using +the &func-read; or &func-write;, which are not augmented by timestamps +or sequence counters, and to avoid unnecessary data copying.</para> + + <para>Finally these ioctls can be used to determine the number of +buffers used internally by a driver in read/write mode. For +implications see the section discussing the &func-read; +function.</para> + + <para>To get and set the streaming parameters applications call +the &VIDIOC-G-PARM; and &VIDIOC-S-PARM; ioctl, respectively. They take +a pointer to a &v4l2-streamparm;, which contains a union holding +separate parameters for input and output devices.</para> + + <para>These ioctls are optional, drivers need not implement +them. If so, they return the &EINVAL;.</para> + </section> diff --git a/Documentation/DocBook/media/v4l/compat.xml b/Documentation/DocBook/media/v4l/compat.xml new file mode 100644 index 00000000000..eee6f0f4aa4 --- /dev/null +++ b/Documentation/DocBook/media/v4l/compat.xml @@ -0,0 +1,2695 @@ + <title>Changes</title> + + <para>The following chapters document the evolution of the V4L2 API, +errata or extensions. They are also intended to help application and +driver writers to port or update their code.</para> + + <section id="diff-v4l"> + <title>Differences between V4L and V4L2</title> + + <para>The Video For Linux API was first introduced in Linux 2.1 to +unify and replace various TV and radio device related interfaces, +developed independently by driver writers in prior years. Starting +with Linux 2.5 the much improved V4L2 API replaces the V4L API. +The support for the old V4L calls were removed from Kernel, but the +library <xref linkend="libv4l" /> supports the conversion of a V4L +API system call into a V4L2 one.</para> + + <section> + <title>Opening and Closing Devices</title> + + <para>For compatibility reasons the character device file names +recommended for V4L2 video capture, overlay, radio and raw +vbi capture devices did not change from those used by V4L. They are +listed in <xref linkend="devices" /> and below in <xref + linkend="v4l-dev" />.</para> + + <para>The teletext devices (minor range 192-223) have been removed in +V4L2 and no longer exist. There is no hardware available anymore for handling +pure teletext. Instead raw or sliced VBI is used.</para> + + <para>The V4L <filename>videodev</filename> module automatically +assigns minor numbers to drivers in load order, depending on the +registered device type. We recommend that V4L2 drivers by default +register devices with the same numbers, but the system administrator +can assign arbitrary minor numbers using driver module options. The +major device number remains 81.</para> + + <table id="v4l-dev"> + <title>V4L Device Types, Names and Numbers</title> + <tgroup cols="3"> + <thead> + <row> + <entry>Device Type</entry> + <entry>File Name</entry> + <entry>Minor Numbers</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry>Video capture and overlay</entry> + <entry><para><filename>/dev/video</filename> and +<filename>/dev/bttv0</filename><footnote> <para>According to +Documentation/devices.txt these should be symbolic links to +<filename>/dev/video0</filename>. Note the original bttv interface is +not compatible with V4L or V4L2.</para> </footnote>, +<filename>/dev/video0</filename> to +<filename>/dev/video63</filename></para></entry> + <entry>0-63</entry> + </row> + <row> + <entry>Radio receiver</entry> + <entry><para><filename>/dev/radio</filename><footnote> + <para>According to +<filename>Documentation/devices.txt</filename> a symbolic link to +<filename>/dev/radio0</filename>.</para> + </footnote>, <filename>/dev/radio0</filename> to +<filename>/dev/radio63</filename></para></entry> + <entry>64-127</entry> + </row> + <row> + <entry>Raw VBI capture</entry> + <entry><para><filename>/dev/vbi</filename>, +<filename>/dev/vbi0</filename> to +<filename>/dev/vbi31</filename></para></entry> + <entry>224-255</entry> + </row> + </tbody> + </tgroup> + </table> + + <para>V4L prohibits (or used to prohibit) multiple opens of a +device file. V4L2 drivers <emphasis>may</emphasis> support multiple +opens, see <xref linkend="open" /> for details and consequences.</para> + + <para>V4L drivers respond to V4L2 ioctls with an &EINVAL;.</para> + </section> + + <section> + <title>Querying Capabilities</title> + + <para>The V4L <constant>VIDIOCGCAP</constant> ioctl is +equivalent to V4L2's &VIDIOC-QUERYCAP;.</para> + + <para>The <structfield>name</structfield> field in struct +<structname>video_capability</structname> became +<structfield>card</structfield> in &v4l2-capability;, +<structfield>type</structfield> was replaced by +<structfield>capabilities</structfield>. Note V4L2 does not +distinguish between device types like this, better think of basic +video input, video output and radio devices supporting a set of +related functions like video capturing, video overlay and VBI +capturing. See <xref linkend="open" /> for an +introduction.<informaltable> + <tgroup cols="3"> + <thead> + <row> + <entry>struct +<structname>video_capability</structname> +<structfield>type</structfield></entry> + <entry>&v4l2-capability; +<structfield>capabilities</structfield> flags</entry> + <entry>Purpose</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry><constant>VID_TYPE_CAPTURE</constant></entry> + <entry><constant>V4L2_CAP_VIDEO_CAPTURE</constant></entry> + <entry>The <link linkend="capture">video +capture</link> interface is supported.</entry> + </row> + <row> + <entry><constant>VID_TYPE_TUNER</constant></entry> + <entry><constant>V4L2_CAP_TUNER</constant></entry> + <entry>The device has a <link linkend="tuner">tuner or +modulator</link>.</entry> + </row> + <row> + <entry><constant>VID_TYPE_TELETEXT</constant></entry> + <entry><constant>V4L2_CAP_VBI_CAPTURE</constant></entry> + <entry>The <link linkend="raw-vbi">raw VBI +capture</link> interface is supported.</entry> + </row> + <row> + <entry><constant>VID_TYPE_OVERLAY</constant></entry> + <entry><constant>V4L2_CAP_VIDEO_OVERLAY</constant></entry> + <entry>The <link linkend="overlay">video +overlay</link> interface is supported.</entry> + </row> + <row> + <entry><constant>VID_TYPE_CHROMAKEY</constant></entry> + <entry><constant>V4L2_FBUF_CAP_CHROMAKEY</constant> in +field <structfield>capability</structfield> of +&v4l2-framebuffer;</entry> + <entry>Whether chromakey overlay is supported. For +more information on overlay see +<xref linkend="overlay" />.</entry> + </row> + <row> + <entry><constant>VID_TYPE_CLIPPING</constant></entry> + <entry><constant>V4L2_FBUF_CAP_LIST_CLIPPING</constant> +and <constant>V4L2_FBUF_CAP_BITMAP_CLIPPING</constant> in field +<structfield>capability</structfield> of &v4l2-framebuffer;</entry> + <entry>Whether clipping the overlaid image is +supported, see <xref linkend="overlay" />.</entry> + </row> + <row> + <entry><constant>VID_TYPE_FRAMERAM</constant></entry> + <entry><constant>V4L2_FBUF_CAP_EXTERNOVERLAY</constant> +<emphasis>not set</emphasis> in field +<structfield>capability</structfield> of &v4l2-framebuffer;</entry> + <entry>Whether overlay overwrites frame buffer memory, +see <xref linkend="overlay" />.</entry> + </row> + <row> + <entry><constant>VID_TYPE_SCALES</constant></entry> + <entry><constant>-</constant></entry> + <entry>This flag indicates if the hardware can scale +images. The V4L2 API implies the scale factor by setting the cropping +dimensions and image size with the &VIDIOC-S-CROP; and &VIDIOC-S-FMT; +ioctl, respectively. The driver returns the closest sizes possible. +For more information on cropping and scaling see <xref + linkend="crop" />.</entry> + </row> + <row> + <entry><constant>VID_TYPE_MONOCHROME</constant></entry> + <entry><constant>-</constant></entry> + <entry>Applications can enumerate the supported image +formats with the &VIDIOC-ENUM-FMT; ioctl to determine if the device +supports grey scale capturing only. For more information on image +formats see <xref linkend="pixfmt" />.</entry> + </row> + <row> + <entry><constant>VID_TYPE_SUBCAPTURE</constant></entry> + <entry><constant>-</constant></entry> + <entry>Applications can call the &VIDIOC-G-CROP; ioctl +to determine if the device supports capturing a subsection of the full +picture ("cropping" in V4L2). If not, the ioctl returns the &EINVAL;. +For more information on cropping and scaling see <xref + linkend="crop" />.</entry> + </row> + <row> + <entry><constant>VID_TYPE_MPEG_DECODER</constant></entry> + <entry><constant>-</constant></entry> + <entry>Applications can enumerate the supported image +formats with the &VIDIOC-ENUM-FMT; ioctl to determine if the device +supports MPEG streams.</entry> + </row> + <row> + <entry><constant>VID_TYPE_MPEG_ENCODER</constant></entry> + <entry><constant>-</constant></entry> + <entry>See above.</entry> + </row> + <row> + <entry><constant>VID_TYPE_MJPEG_DECODER</constant></entry> + <entry><constant>-</constant></entry> + <entry>See above.</entry> + </row> + <row> + <entry><constant>VID_TYPE_MJPEG_ENCODER</constant></entry> + <entry><constant>-</constant></entry> + <entry>See above.</entry> + </row> + </tbody> + </tgroup> + </informaltable></para> + + <para>The <structfield>audios</structfield> field was replaced +by <structfield>capabilities</structfield> flag +<constant>V4L2_CAP_AUDIO</constant>, indicating +<emphasis>if</emphasis> the device has any audio inputs or outputs. To +determine their number applications can enumerate audio inputs with +the &VIDIOC-G-AUDIO; ioctl. The audio ioctls are described in <xref + linkend="audio" />.</para> + + <para>The <structfield>maxwidth</structfield>, +<structfield>maxheight</structfield>, +<structfield>minwidth</structfield> and +<structfield>minheight</structfield> fields were removed. Calling the +&VIDIOC-S-FMT; or &VIDIOC-TRY-FMT; ioctl with the desired dimensions +returns the closest size possible, taking into account the current +video standard, cropping and scaling limitations.</para> + </section> + + <section> + <title>Video Sources</title> + + <para>V4L provides the <constant>VIDIOCGCHAN</constant> and +<constant>VIDIOCSCHAN</constant> ioctl using struct +<structname>video_channel</structname> to enumerate +the video inputs of a V4L device. The equivalent V4L2 ioctls +are &VIDIOC-ENUMINPUT;, &VIDIOC-G-INPUT; and &VIDIOC-S-INPUT; +using &v4l2-input; as discussed in <xref linkend="video" />.</para> + + <para>The <structfield>channel</structfield> field counting +inputs was renamed to <structfield>index</structfield>, the video +input types were renamed as follows: <informaltable> + <tgroup cols="2"> + <thead> + <row> + <entry>struct <structname>video_channel</structname> +<structfield>type</structfield></entry> + <entry>&v4l2-input; +<structfield>type</structfield></entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry><constant>VIDEO_TYPE_TV</constant></entry> + <entry><constant>V4L2_INPUT_TYPE_TUNER</constant></entry> + </row> + <row> + <entry><constant>VIDEO_TYPE_CAMERA</constant></entry> + <entry><constant>V4L2_INPUT_TYPE_CAMERA</constant></entry> + </row> + </tbody> + </tgroup> + </informaltable></para> + + <para>Unlike the <structfield>tuners</structfield> field +expressing the number of tuners of this input, V4L2 assumes each video +input is connected to at most one tuner. However a tuner can have more +than one input, &ie; RF connectors, and a device can have multiple +tuners. The index number of the tuner associated with the input, if +any, is stored in field <structfield>tuner</structfield> of +&v4l2-input;. Enumeration of tuners is discussed in <xref + linkend="tuner" />.</para> + + <para>The redundant <constant>VIDEO_VC_TUNER</constant> flag was +dropped. Video inputs associated with a tuner are of type +<constant>V4L2_INPUT_TYPE_TUNER</constant>. The +<constant>VIDEO_VC_AUDIO</constant> flag was replaced by the +<structfield>audioset</structfield> field. V4L2 considers devices with +up to 32 audio inputs. Each set bit in the +<structfield>audioset</structfield> field represents one audio input +this video input combines with. For information about audio inputs and +how to switch between them see <xref linkend="audio" />.</para> + + <para>The <structfield>norm</structfield> field describing the +supported video standards was replaced by +<structfield>std</structfield>. The V4L specification mentions a flag +<constant>VIDEO_VC_NORM</constant> indicating whether the standard can +be changed. This flag was a later addition together with the +<structfield>norm</structfield> field and has been removed in the +meantime. V4L2 has a similar, albeit more comprehensive approach +to video standards, see <xref linkend="standard" /> for more +information.</para> + </section> + + <section> + <title>Tuning</title> + + <para>The V4L <constant>VIDIOCGTUNER</constant> and +<constant>VIDIOCSTUNER</constant> ioctl and struct +<structname>video_tuner</structname> can be used to enumerate the +tuners of a V4L TV or radio device. The equivalent V4L2 ioctls are +&VIDIOC-G-TUNER; and &VIDIOC-S-TUNER; using &v4l2-tuner;. Tuners are +covered in <xref linkend="tuner" />.</para> + + <para>The <structfield>tuner</structfield> field counting tuners +was renamed to <structfield>index</structfield>. The fields +<structfield>name</structfield>, <structfield>rangelow</structfield> +and <structfield>rangehigh</structfield> remained unchanged.</para> + + <para>The <constant>VIDEO_TUNER_PAL</constant>, +<constant>VIDEO_TUNER_NTSC</constant> and +<constant>VIDEO_TUNER_SECAM</constant> flags indicating the supported +video standards were dropped. This information is now contained in the +associated &v4l2-input;. No replacement exists for the +<constant>VIDEO_TUNER_NORM</constant> flag indicating whether the +video standard can be switched. The <structfield>mode</structfield> +field to select a different video standard was replaced by a whole new +set of ioctls and structures described in <xref linkend="standard" />. +Due to its ubiquity it should be mentioned the BTTV driver supports +several standards in addition to the regular +<constant>VIDEO_MODE_PAL</constant> (0), +<constant>VIDEO_MODE_NTSC</constant>, +<constant>VIDEO_MODE_SECAM</constant> and +<constant>VIDEO_MODE_AUTO</constant> (3). Namely N/PAL Argentina, +M/PAL, N/PAL, and NTSC Japan with numbers 3-6 (sic).</para> + + <para>The <constant>VIDEO_TUNER_STEREO_ON</constant> flag +indicating stereo reception became +<constant>V4L2_TUNER_SUB_STEREO</constant> in field +<structfield>rxsubchans</structfield>. This field also permits the +detection of monaural and bilingual audio, see the definition of +&v4l2-tuner; for details. Presently no replacement exists for the +<constant>VIDEO_TUNER_RDS_ON</constant> and +<constant>VIDEO_TUNER_MBS_ON</constant> flags.</para> + + <para> The <constant>VIDEO_TUNER_LOW</constant> flag was renamed +to <constant>V4L2_TUNER_CAP_LOW</constant> in the &v4l2-tuner; +<structfield>capability</structfield> field.</para> + + <para>The <constant>VIDIOCGFREQ</constant> and +<constant>VIDIOCSFREQ</constant> ioctl to change the tuner frequency +where renamed to &VIDIOC-G-FREQUENCY; and &VIDIOC-S-FREQUENCY;. They +take a pointer to a &v4l2-frequency; instead of an unsigned long +integer.</para> + </section> + + <section id="v4l-image-properties"> + <title>Image Properties</title> + + <para>V4L2 has no equivalent of the +<constant>VIDIOCGPICT</constant> and <constant>VIDIOCSPICT</constant> +ioctl and struct <structname>video_picture</structname>. The following +fields where replaced by V4L2 controls accessible with the +&VIDIOC-QUERYCTRL;, &VIDIOC-G-CTRL; and &VIDIOC-S-CTRL; ioctls:<informaltable> + <tgroup cols="2"> + <thead> + <row> + <entry>struct <structname>video_picture</structname></entry> + <entry>V4L2 Control ID</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry><structfield>brightness</structfield></entry> + <entry><constant>V4L2_CID_BRIGHTNESS</constant></entry> + </row> + <row> + <entry><structfield>hue</structfield></entry> + <entry><constant>V4L2_CID_HUE</constant></entry> + </row> + <row> + <entry><structfield>colour</structfield></entry> + <entry><constant>V4L2_CID_SATURATION</constant></entry> + </row> + <row> + <entry><structfield>contrast</structfield></entry> + <entry><constant>V4L2_CID_CONTRAST</constant></entry> + </row> + <row> + <entry><structfield>whiteness</structfield></entry> + <entry><constant>V4L2_CID_WHITENESS</constant></entry> + </row> + </tbody> + </tgroup> + </informaltable></para> + + <para>The V4L picture controls are assumed to range from 0 to +65535 with no particular reset value. The V4L2 API permits arbitrary +limits and defaults which can be queried with the &VIDIOC-QUERYCTRL; +ioctl. For general information about controls see <xref +linkend="control" />.</para> + + <para>The <structfield>depth</structfield> (average number of +bits per pixel) of a video image is implied by the selected image +format. V4L2 does not explicitly provide such information assuming +applications recognizing the format are aware of the image depth and +others need not know. The <structfield>palette</structfield> field +moved into the &v4l2-pix-format;:<informaltable> + <tgroup cols="2"> + <thead> + <row> + <entry>struct <structname>video_picture</structname> +<structfield>palette</structfield></entry> + <entry>&v4l2-pix-format; +<structfield>pixfmt</structfield></entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry><constant>VIDEO_PALETTE_GREY</constant></entry> + <entry><para><link +linkend="V4L2-PIX-FMT-GREY"><constant>V4L2_PIX_FMT_GREY</constant></link></para></entry> + </row> + <row> + <entry><constant>VIDEO_PALETTE_HI240</constant></entry> + <entry><para><link +linkend="pixfmt-reserved"><constant>V4L2_PIX_FMT_HI240</constant></link><footnote> + <para>This is a custom format used by the BTTV +driver, not one of the V4L2 standard formats.</para> + </footnote></para></entry> + </row> + <row> + <entry><constant>VIDEO_PALETTE_RGB565</constant></entry> + <entry><para><link +linkend="pixfmt-rgb"><constant>V4L2_PIX_FMT_RGB565</constant></link></para></entry> + </row> + <row> + <entry><constant>VIDEO_PALETTE_RGB555</constant></entry> + <entry><para><link +linkend="pixfmt-rgb"><constant>V4L2_PIX_FMT_RGB555</constant></link></para></entry> + </row> + <row> + <entry><constant>VIDEO_PALETTE_RGB24</constant></entry> + <entry><para><link +linkend="pixfmt-rgb"><constant>V4L2_PIX_FMT_BGR24</constant></link></para></entry> + </row> + <row> + <entry><constant>VIDEO_PALETTE_RGB32</constant></entry> + <entry><para><link +linkend="pixfmt-rgb"><constant>V4L2_PIX_FMT_BGR32</constant></link><footnote> + <para>Presumably all V4L RGB formats are +little-endian, although some drivers might interpret them according to machine endianness. V4L2 defines little-endian, big-endian and red/blue +swapped variants. For details see <xref linkend="pixfmt-rgb" />.</para> + </footnote></para></entry> + </row> + <row> + <entry><constant>VIDEO_PALETTE_YUV422</constant></entry> + <entry><para><link +linkend="V4L2-PIX-FMT-YUYV"><constant>V4L2_PIX_FMT_YUYV</constant></link></para></entry> + </row> + <row> + <entry><para><constant>VIDEO_PALETTE_YUYV</constant><footnote> + <para><constant>VIDEO_PALETTE_YUV422</constant> +and <constant>VIDEO_PALETTE_YUYV</constant> are the same formats. Some +V4L drivers respond to one, some to the other.</para> + </footnote></para></entry> + <entry><para><link +linkend="V4L2-PIX-FMT-YUYV"><constant>V4L2_PIX_FMT_YUYV</constant></link></para></entry> + </row> + <row> + <entry><constant>VIDEO_PALETTE_UYVY</constant></entry> + <entry><para><link +linkend="V4L2-PIX-FMT-UYVY"><constant>V4L2_PIX_FMT_UYVY</constant></link></para></entry> + </row> + <row> + <entry><constant>VIDEO_PALETTE_YUV420</constant></entry> + <entry>None</entry> + </row> + <row> + <entry><constant>VIDEO_PALETTE_YUV411</constant></entry> + <entry><para><link +linkend="V4L2-PIX-FMT-Y41P"><constant>V4L2_PIX_FMT_Y41P</constant></link><footnote> + <para>Not to be confused with +<constant>V4L2_PIX_FMT_YUV411P</constant>, which is a planar +format.</para> </footnote></para></entry> + </row> + <row> + <entry><constant>VIDEO_PALETTE_RAW</constant></entry> + <entry><para>None<footnote> <para>V4L explains this +as: "RAW capture (BT848)"</para> </footnote></para></entry> + </row> + <row> + <entry><constant>VIDEO_PALETTE_YUV422P</constant></entry> + <entry><para><link +linkend="V4L2-PIX-FMT-YUV422P"><constant>V4L2_PIX_FMT_YUV422P</constant></link></para></entry> + </row> + <row> + <entry><constant>VIDEO_PALETTE_YUV411P</constant></entry> + <entry><para><link +linkend="V4L2-PIX-FMT-YUV411P"><constant>V4L2_PIX_FMT_YUV411P</constant></link><footnote> + <para>Not to be confused with +<constant>V4L2_PIX_FMT_Y41P</constant>, which is a packed +format.</para> </footnote></para></entry> + </row> + <row> + <entry><constant>VIDEO_PALETTE_YUV420P</constant></entry> + <entry><para><link +linkend="V4L2-PIX-FMT-YVU420"><constant>V4L2_PIX_FMT_YVU420</constant></link></para></entry> + </row> + <row> + <entry><constant>VIDEO_PALETTE_YUV410P</constant></entry> + <entry><para><link +linkend="V4L2-PIX-FMT-YVU410"><constant>V4L2_PIX_FMT_YVU410</constant></link></para></entry> + </row> + </tbody> + </tgroup> + </informaltable></para> + + <para>V4L2 image formats are defined in <xref +linkend="pixfmt" />. The image format can be selected with the +&VIDIOC-S-FMT; ioctl.</para> + </section> + + <section> + <title>Audio</title> + + <para>The <constant>VIDIOCGAUDIO</constant> and +<constant>VIDIOCSAUDIO</constant> ioctl and struct +<structname>video_audio</structname> are used to enumerate the +audio inputs of a V4L device. The equivalent V4L2 ioctls are +&VIDIOC-G-AUDIO; and &VIDIOC-S-AUDIO; using &v4l2-audio; as +discussed in <xref linkend="audio" />.</para> + + <para>The <structfield>audio</structfield> "channel number" +field counting audio inputs was renamed to +<structfield>index</structfield>.</para> + + <para>On <constant>VIDIOCSAUDIO</constant> the +<structfield>mode</structfield> field selects <emphasis>one</emphasis> +of the <constant>VIDEO_SOUND_MONO</constant>, +<constant>VIDEO_SOUND_STEREO</constant>, +<constant>VIDEO_SOUND_LANG1</constant> or +<constant>VIDEO_SOUND_LANG2</constant> audio demodulation modes. When +the current audio standard is BTSC +<constant>VIDEO_SOUND_LANG2</constant> refers to SAP and +<constant>VIDEO_SOUND_LANG1</constant> is meaningless. Also +undocumented in the V4L specification, there is no way to query the +selected mode. On <constant>VIDIOCGAUDIO</constant> the driver returns +the <emphasis>actually received</emphasis> audio programmes in this +field. In the V4L2 API this information is stored in the &v4l2-tuner; +<structfield>rxsubchans</structfield> and +<structfield>audmode</structfield> fields, respectively. See <xref +linkend="tuner" /> for more information on tuners. Related to audio +modes &v4l2-audio; also reports if this is a mono or stereo +input, regardless if the source is a tuner.</para> + + <para>The following fields where replaced by V4L2 controls +accessible with the &VIDIOC-QUERYCTRL;, &VIDIOC-G-CTRL; and +&VIDIOC-S-CTRL; ioctls:<informaltable> + <tgroup cols="2"> + <thead> + <row> + <entry>struct +<structname>video_audio</structname></entry> + <entry>V4L2 Control ID</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry><structfield>volume</structfield></entry> + <entry><constant>V4L2_CID_AUDIO_VOLUME</constant></entry> + </row> + <row> + <entry><structfield>bass</structfield></entry> + <entry><constant>V4L2_CID_AUDIO_BASS</constant></entry> + </row> + <row> + <entry><structfield>treble</structfield></entry> + <entry><constant>V4L2_CID_AUDIO_TREBLE</constant></entry> + </row> + <row> + <entry><structfield>balance</structfield></entry> + <entry><constant>V4L2_CID_AUDIO_BALANCE</constant></entry> + </row> + </tbody> + </tgroup> + </informaltable></para> + + <para>To determine which of these controls are supported by a +driver V4L provides the <structfield>flags</structfield> +<constant>VIDEO_AUDIO_VOLUME</constant>, +<constant>VIDEO_AUDIO_BASS</constant>, +<constant>VIDEO_AUDIO_TREBLE</constant> and +<constant>VIDEO_AUDIO_BALANCE</constant>. In the V4L2 API the +&VIDIOC-QUERYCTRL; ioctl reports if the respective control is +supported. Accordingly the <constant>VIDEO_AUDIO_MUTABLE</constant> +and <constant>VIDEO_AUDIO_MUTE</constant> flags where replaced by the +boolean <constant>V4L2_CID_AUDIO_MUTE</constant> control.</para> + + <para>All V4L2 controls have a <structfield>step</structfield> +attribute replacing the struct <structname>video_audio</structname> +<structfield>step</structfield> field. The V4L audio controls are +assumed to range from 0 to 65535 with no particular reset value. The +V4L2 API permits arbitrary limits and defaults which can be queried +with the &VIDIOC-QUERYCTRL; ioctl. For general information about +controls see <xref linkend="control" />.</para> + </section> + + <section> + <title>Frame Buffer Overlay</title> + + <para>The V4L2 ioctls equivalent to +<constant>VIDIOCGFBUF</constant> and <constant>VIDIOCSFBUF</constant> +are &VIDIOC-G-FBUF; and &VIDIOC-S-FBUF;. The +<structfield>base</structfield> field of struct +<structname>video_buffer</structname> remained unchanged, except V4L2 +defines a flag to indicate non-destructive overlays instead of a +<constant>NULL</constant> pointer. All other fields moved into the +&v4l2-pix-format; <structfield>fmt</structfield> substructure of +&v4l2-framebuffer;. The <structfield>depth</structfield> field was +replaced by <structfield>pixelformat</structfield>. See <xref + linkend="pixfmt-rgb" /> for a list of RGB formats and their +respective color depths.</para> + + <para>Instead of the special ioctls +<constant>VIDIOCGWIN</constant> and <constant>VIDIOCSWIN</constant> +V4L2 uses the general-purpose data format negotiation ioctls +&VIDIOC-G-FMT; and &VIDIOC-S-FMT;. They take a pointer to a +&v4l2-format; as argument. Here the <structfield>win</structfield> +member of the <structfield>fmt</structfield> union is used, a +&v4l2-window;.</para> + + <para>The <structfield>x</structfield>, +<structfield>y</structfield>, <structfield>width</structfield> and +<structfield>height</structfield> fields of struct +<structname>video_window</structname> moved into &v4l2-rect; +substructure <structfield>w</structfield> of struct +<structname>v4l2_window</structname>. The +<structfield>chromakey</structfield>, +<structfield>clips</structfield>, and +<structfield>clipcount</structfield> fields remained unchanged. Struct +<structname>video_clip</structname> was renamed to &v4l2-clip;, also +containing a struct <structname>v4l2_rect</structname>, but the +semantics are still the same.</para> + + <para>The <constant>VIDEO_WINDOW_INTERLACE</constant> flag was +dropped. Instead applications must set the +<structfield>field</structfield> field to +<constant>V4L2_FIELD_ANY</constant> or +<constant>V4L2_FIELD_INTERLACED</constant>. The +<constant>VIDEO_WINDOW_CHROMAKEY</constant> flag moved into +&v4l2-framebuffer;, under the new name +<constant>V4L2_FBUF_FLAG_CHROMAKEY</constant>.</para> + + <para>In V4L, storing a bitmap pointer in +<structfield>clips</structfield> and setting +<structfield>clipcount</structfield> to +<constant>VIDEO_CLIP_BITMAP</constant> (-1) requests bitmap +clipping, using a fixed size bitmap of 1024 × 625 bits. Struct +<structname>v4l2_window</structname> has a separate +<structfield>bitmap</structfield> pointer field for this purpose and +the bitmap size is determined by <structfield>w.width</structfield> and +<structfield>w.height</structfield>.</para> + + <para>The <constant>VIDIOCCAPTURE</constant> ioctl to enable or +disable overlay was renamed to &VIDIOC-OVERLAY;.</para> + </section> + + <section> + <title>Cropping</title> + + <para>To capture only a subsection of the full picture V4L +defines the <constant>VIDIOCGCAPTURE</constant> and +<constant>VIDIOCSCAPTURE</constant> ioctls using struct +<structname>video_capture</structname>. The equivalent V4L2 ioctls are +&VIDIOC-G-CROP; and &VIDIOC-S-CROP; using &v4l2-crop;, and the related +&VIDIOC-CROPCAP; ioctl. This is a rather complex matter, see +<xref linkend="crop" /> for details.</para> + + <para>The <structfield>x</structfield>, +<structfield>y</structfield>, <structfield>width</structfield> and +<structfield>height</structfield> fields moved into &v4l2-rect; +substructure <structfield>c</structfield> of struct +<structname>v4l2_crop</structname>. The +<structfield>decimation</structfield> field was dropped. In the V4L2 +API the scaling factor is implied by the size of the cropping +rectangle and the size of the captured or overlaid image.</para> + + <para>The <constant>VIDEO_CAPTURE_ODD</constant> +and <constant>VIDEO_CAPTURE_EVEN</constant> flags to capture only the +odd or even field, respectively, were replaced by +<constant>V4L2_FIELD_TOP</constant> and +<constant>V4L2_FIELD_BOTTOM</constant> in the field named +<structfield>field</structfield> of &v4l2-pix-format; and +&v4l2-window;. These structures are used to select a capture or +overlay format with the &VIDIOC-S-FMT; ioctl.</para> + </section> + + <section> + <title>Reading Images, Memory Mapping</title> + + <section> + <title>Capturing using the read method</title> + + <para>There is no essential difference between reading images +from a V4L or V4L2 device using the &func-read; function, however V4L2 +drivers are not required to support this I/O method. Applications can +determine if the function is available with the &VIDIOC-QUERYCAP; +ioctl. All V4L2 devices exchanging data with applications must support +the &func-select; and &func-poll; functions.</para> + + <para>To select an image format and size, V4L provides the +<constant>VIDIOCSPICT</constant> and <constant>VIDIOCSWIN</constant> +ioctls. V4L2 uses the general-purpose data format negotiation ioctls +&VIDIOC-G-FMT; and &VIDIOC-S-FMT;. They take a pointer to a +&v4l2-format; as argument, here the &v4l2-pix-format; named +<structfield>pix</structfield> of its <structfield>fmt</structfield> +union is used.</para> + + <para>For more information about the V4L2 read interface see +<xref linkend="rw" />.</para> + </section> + <section> + <title>Capturing using memory mapping</title> + + <para>Applications can read from V4L devices by mapping +buffers in device memory, or more often just buffers allocated in +DMA-able system memory, into their address space. This avoids the data +copying overhead of the read method. V4L2 supports memory mapping as +well, with a few differences.</para> + + <informaltable> + <tgroup cols="2"> + <thead> + <row> + <entry>V4L</entry> + <entry>V4L2</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry></entry> + <entry>The image format must be selected before +buffers are allocated, with the &VIDIOC-S-FMT; ioctl. When no format +is selected the driver may use the last, possibly by another +application requested format.</entry> + </row> + <row> + <entry><para>Applications cannot change the number of +buffers. The it is built into the driver, unless it has a module +option to change the number when the driver module is +loaded.</para></entry> + <entry><para>The &VIDIOC-REQBUFS; ioctl allocates the +desired number of buffers, this is a required step in the initialization +sequence.</para></entry> + </row> + <row> + <entry><para>Drivers map all buffers as one contiguous +range of memory. The <constant>VIDIOCGMBUF</constant> ioctl is +available to query the number of buffers, the offset of each buffer +from the start of the virtual file, and the overall amount of memory +used, which can be used as arguments for the &func-mmap; +function.</para></entry> + <entry><para>Buffers are individually mapped. The +offset and size of each buffer can be determined with the +&VIDIOC-QUERYBUF; ioctl.</para></entry> + </row> + <row> + <entry><para>The <constant>VIDIOCMCAPTURE</constant> +ioctl prepares a buffer for capturing. It also determines the image +format for this buffer. The ioctl returns immediately, eventually with +an &EAGAIN; if no video signal had been detected. When the driver +supports more than one buffer applications can call the ioctl multiple +times and thus have multiple outstanding capture +requests.</para><para>The <constant>VIDIOCSYNC</constant> ioctl +suspends execution until a particular buffer has been +filled.</para></entry> + <entry><para>Drivers maintain an incoming and outgoing +queue. &VIDIOC-QBUF; enqueues any empty buffer into the incoming +queue. Filled buffers are dequeued from the outgoing queue with the +&VIDIOC-DQBUF; ioctl. To wait until filled buffers become available this +function, &func-select; or &func-poll; can be used. The +&VIDIOC-STREAMON; ioctl must be called once after enqueuing one or +more buffers to start capturing. Its counterpart +&VIDIOC-STREAMOFF; stops capturing and dequeues all buffers from both +queues. Applications can query the signal status, if known, with the +&VIDIOC-ENUMINPUT; ioctl.</para></entry> + </row> + </tbody> + </tgroup> + </informaltable> + + <para>For a more in-depth discussion of memory mapping and +examples, see <xref linkend="mmap" />.</para> + </section> + </section> + + <section> + <title>Reading Raw VBI Data</title> + + <para>Originally the V4L API did not specify a raw VBI capture +interface, only the device file <filename>/dev/vbi</filename> was +reserved for this purpose. The only driver supporting this interface +was the BTTV driver, de-facto defining the V4L VBI interface. Reading +from the device yields a raw VBI image with the following +parameters:<informaltable> + <tgroup cols="2"> + <thead> + <row> + <entry>&v4l2-vbi-format;</entry> + <entry>V4L, BTTV driver</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry>sampling_rate</entry> + <entry>28636363 Hz NTSC (or any other 525-line +standard); 35468950 Hz PAL and SECAM (625-line standards)</entry> + </row> + <row> + <entry>offset</entry> + <entry>?</entry> + </row> + <row> + <entry>samples_per_line</entry> + <entry>2048</entry> + </row> + <row> + <entry>sample_format</entry> + <entry>V4L2_PIX_FMT_GREY. The last four bytes (a +machine endianness integer) contain a frame counter.</entry> + </row> + <row> + <entry>start[]</entry> + <entry>10, 273 NTSC; 22, 335 PAL and SECAM</entry> + </row> + <row> + <entry>count[]</entry> + <entry><para>16, 16<footnote><para>Old driver +versions used different values, eventually the custom +<constant>BTTV_VBISIZE</constant> ioctl was added to query the +correct values.</para></footnote></para></entry> + </row> + <row> + <entry>flags</entry> + <entry>0</entry> + </row> + </tbody> + </tgroup> + </informaltable></para> + + <para>Undocumented in the V4L specification, in Linux 2.3 the +<constant>VIDIOCGVBIFMT</constant> and +<constant>VIDIOCSVBIFMT</constant> ioctls using struct +<structname>vbi_format</structname> were added to determine the VBI +image parameters. These ioctls are only partially compatible with the +V4L2 VBI interface specified in <xref linkend="raw-vbi" />.</para> + + <para>An <structfield>offset</structfield> field does not +exist, <structfield>sample_format</structfield> is supposed to be +<constant>VIDEO_PALETTE_RAW</constant>, equivalent to +<constant>V4L2_PIX_FMT_GREY</constant>. The remaining fields are +probably equivalent to &v4l2-vbi-format;.</para> + + <para>Apparently only the Zoran (ZR 36120) driver implements +these ioctls. The semantics differ from those specified for V4L2 in two +ways. The parameters are reset on &func-open; and +<constant>VIDIOCSVBIFMT</constant> always returns an &EINVAL; if the +parameters are invalid.</para> + </section> + + <section> + <title>Miscellaneous</title> + + <para>V4L2 has no equivalent of the +<constant>VIDIOCGUNIT</constant> ioctl. Applications can find the VBI +device associated with a video capture device (or vice versa) by +reopening the device and requesting VBI data. For details see +<xref linkend="open" />.</para> + + <para>No replacement exists for <constant>VIDIOCKEY</constant>, +and the V4L functions for microcode programming. A new interface for +MPEG compression and playback devices is documented in <xref + linkend="extended-controls" />.</para> + </section> + + </section> + + <section id="hist-v4l2"> + <title>Changes of the V4L2 API</title> + + <para>Soon after the V4L API was added to the kernel it was +criticised as too inflexible. In August 1998 Bill Dirks proposed a +number of improvements and began to work on documentation, example +drivers and applications. With the help of other volunteers this +eventually became the V4L2 API, not just an extension but a +replacement for the V4L API. However it took another four years and +two stable kernel releases until the new API was finally accepted for +inclusion into the kernel in its present form.</para> + + <section> + <title>Early Versions</title> + <para>1998-08-20: First version.</para> + + <para>1998-08-27: The &func-select; function was introduced.</para> + + <para>1998-09-10: New video standard interface.</para> + + <para>1998-09-18: The <constant>VIDIOC_NONCAP</constant> ioctl +was replaced by the otherwise meaningless <constant>O_TRUNC</constant> +&func-open; flag, and the aliases <constant>O_NONCAP</constant> and +<constant>O_NOIO</constant> were defined. Applications can set this +flag if they intend to access controls only, as opposed to capture +applications which need exclusive access. The +<constant>VIDEO_STD_XXX</constant> identifiers are now ordinals +instead of flags, and the <function>video_std_construct()</function> +helper function takes id and transmission arguments.</para> + + <para>1998-09-28: Revamped video standard. Made video controls +individually enumerable.</para> + + <para>1998-10-02: The <structfield>id</structfield> field was +removed from struct <structname>video_standard</structname> and the +color subcarrier fields were renamed. The &VIDIOC-QUERYSTD; ioctl was +renamed to &VIDIOC-ENUMSTD;, &VIDIOC-G-INPUT; to &VIDIOC-ENUMINPUT;. A +first draft of the Codec API was released.</para> + + <para>1998-11-08: Many minor changes. Most symbols have been +renamed. Some material changes to &v4l2-capability;.</para> + + <para>1998-11-12: The read/write directon of some ioctls was misdefined.</para> + + <para>1998-11-14: <constant>V4L2_PIX_FMT_RGB24</constant> +changed to <constant>V4L2_PIX_FMT_BGR24</constant>, and +<constant>V4L2_PIX_FMT_RGB32</constant> changed to +<constant>V4L2_PIX_FMT_BGR32</constant>. Audio controls are now +accessible with the &VIDIOC-G-CTRL; and &VIDIOC-S-CTRL; ioctls under +names starting with <constant>V4L2_CID_AUDIO</constant>. The +<constant>V4L2_MAJOR</constant> define was removed from +<filename>videodev.h</filename> since it was only used once in the +<filename>videodev</filename> kernel module. The +<constant>YUV422</constant> and <constant>YUV411</constant> planar +image formats were added.</para> + + <para>1998-11-28: A few ioctl symbols changed. Interfaces for codecs and +video output devices were added.</para> + + <para>1999-01-14: A raw VBI capture interface was added.</para> + + <para>1999-01-19: The <constant>VIDIOC_NEXTBUF</constant> ioctl + was removed.</para> + </section> + + <section> + <title>V4L2 Version 0.16 1999-01-31</title> + <para>1999-01-27: There is now one QBUF ioctl, VIDIOC_QWBUF and VIDIOC_QRBUF +are gone. VIDIOC_QBUF takes a v4l2_buffer as a parameter. Added +digital zoom (cropping) controls.</para> + </section> + + <!-- Where's 0.17? mhs couldn't find that videodev.h, perhaps Bill + forgot to bump the version number or never released it. --> + + <section> + <title>V4L2 Version 0.18 1999-03-16</title> + <para>Added a v4l to V4L2 ioctl compatibility layer to +videodev.c. Driver writers, this changes how you implement your ioctl +handler. See the Driver Writer's Guide. Added some more control id +codes.</para> + </section> + + <section> + <title>V4L2 Version 0.19 1999-06-05</title> + <para>1999-03-18: Fill in the category and catname fields of +v4l2_queryctrl objects before passing them to the driver. Required a +minor change to the VIDIOC_QUERYCTRL handlers in the sample +drivers.</para> + <para>1999-03-31: Better compatibility for v4l memory capture +ioctls. Requires changes to drivers to fully support new compatibility +features, see Driver Writer's Guide and v4l2cap.c. Added new control +IDs: V4L2_CID_HFLIP, _VFLIP. Changed V4L2_PIX_FMT_YUV422P to _YUV422P, +and _YUV411P to _YUV411P.</para> + <para>1999-04-04: Added a few more control IDs.</para> + <para>1999-04-07: Added the button control type.</para> + <para>1999-05-02: Fixed a typo in videodev.h, and added the +V4L2_CTRL_FLAG_GRAYED (later V4L2_CTRL_FLAG_GRABBED) flag.</para> + <para>1999-05-20: Definition of VIDIOC_G_CTRL was wrong causing +a malfunction of this ioctl.</para> + <para>1999-06-05: Changed the value of +V4L2_CID_WHITENESS.</para> + </section> + + <section> + <title>V4L2 Version 0.20 (1999-09-10)</title> + + <para>Version 0.20 introduced a number of changes which were +<emphasis>not backward compatible</emphasis> with 0.19 and earlier +versions. Purpose of these changes was to simplify the API, while +making it more extensible and following common Linux driver API +conventions.</para> + + <orderedlist> + <listitem> + <para>Some typos in <constant>V4L2_FMT_FLAG</constant> +symbols were fixed. &v4l2-clip; was changed for compatibility with +v4l. (1999-08-30)</para> + </listitem> + + <listitem> + <para><constant>V4L2_TUNER_SUB_LANG1</constant> was added. +(1999-09-05)</para> + </listitem> + + <listitem> + <para>All ioctl() commands that used an integer argument now +take a pointer to an integer. Where it makes sense, ioctls will return +the actual new value in the integer pointed to by the argument, a +common convention in the V4L2 API. The affected ioctls are: +VIDIOC_PREVIEW, VIDIOC_STREAMON, VIDIOC_STREAMOFF, VIDIOC_S_FREQ, +VIDIOC_S_INPUT, VIDIOC_S_OUTPUT, VIDIOC_S_EFFECT. For example +<programlisting> +err = ioctl (fd, VIDIOC_XXX, V4L2_XXX); +</programlisting> becomes <programlisting> +int a = V4L2_XXX; err = ioctl(fd, VIDIOC_XXX, &a); +</programlisting> + </para> + </listitem> + + <listitem> + <para>All the different get- and set-format commands were +swept into one &VIDIOC-G-FMT; and &VIDIOC-S-FMT; ioctl taking a union +and a type field selecting the union member as parameter. Purpose is to +simplify the API by eliminating several ioctls and to allow new and +driver private data streams without adding new ioctls.</para> + + <para>This change obsoletes the following ioctls: +<constant>VIDIOC_S_INFMT</constant>, +<constant>VIDIOC_G_INFMT</constant>, +<constant>VIDIOC_S_OUTFMT</constant>, +<constant>VIDIOC_G_OUTFMT</constant>, +<constant>VIDIOC_S_VBIFMT</constant> and +<constant>VIDIOC_G_VBIFMT</constant>. The image format structure +<structname>v4l2_format</structname> was renamed to &v4l2-pix-format;, +while &v4l2-format; is now the envelopping structure for all format +negotiations.</para> + </listitem> + + <listitem> + <para>Similar to the changes above, the +<constant>VIDIOC_G_PARM</constant> and +<constant>VIDIOC_S_PARM</constant> ioctls were merged with +<constant>VIDIOC_G_OUTPARM</constant> and +<constant>VIDIOC_S_OUTPARM</constant>. A +<structfield>type</structfield> field in the new &v4l2-streamparm; +selects the respective union member.</para> + + <para>This change obsoletes the +<constant>VIDIOC_G_OUTPARM</constant> and +<constant>VIDIOC_S_OUTPARM</constant> ioctls.</para> + </listitem> + + <listitem> + <para>Control enumeration was simplified, and two new +control flags were introduced and one dropped. The +<structfield>catname</structfield> field was replaced by a +<structfield>group</structfield> field.</para> + + <para>Drivers can now flag unsupported and temporarily +unavailable controls with <constant>V4L2_CTRL_FLAG_DISABLED</constant> +and <constant>V4L2_CTRL_FLAG_GRABBED</constant> respectively. The +<structfield>group</structfield> name indicates a possibly narrower +classification than the <structfield>category</structfield>. In other +words, there may be multiple groups within a category. Controls within +a group would typically be drawn within a group box. Controls in +different categories might have a greater separation, or may even +appear in separate windows.</para> + </listitem> + + <listitem> + <para>The &v4l2-buffer; <structfield>timestamp</structfield> +was changed to a 64 bit integer, containing the sampling or output +time of the frame in nanoseconds. Additionally timestamps will be in +absolute system time, not starting from zero at the beginning of a +stream. The data type name for timestamps is stamp_t, defined as a +signed 64-bit integer. Output devices should not send a buffer out +until the time in the timestamp field has arrived. I would like to +follow SGI's lead, and adopt a multimedia timestamping system like +their UST (Unadjusted System Time). See +http://web.archive.org/web/*/http://reality.sgi.com +/cpirazzi_engr/lg/time/intro.html. +UST uses timestamps that are 64-bit signed integers +(not struct timeval's) and given in nanosecond units. The UST clock +starts at zero when the system is booted and runs continuously and +uniformly. It takes a little over 292 years for UST to overflow. There +is no way to set the UST clock. The regular Linux time-of-day clock +can be changed periodically, which would cause errors if it were being +used for timestamping a multimedia stream. A real UST style clock will +require some support in the kernel that is not there yet. But in +anticipation, I will change the timestamp field to a 64-bit integer, +and I will change the v4l2_masterclock_gettime() function (used only +by drivers) to return a 64-bit integer.</para> + </listitem> + + <listitem> + <para>A <structfield>sequence</structfield> field was added +to &v4l2-buffer;. The <structfield>sequence</structfield> field counts +captured frames, it is ignored by output devices. When a capture +driver drops a frame, the sequence number of that frame is +skipped.</para> + </listitem> + </orderedlist> + </section> + + <section> + <title>V4L2 Version 0.20 incremental changes</title> + <!-- Version number didn't change anymore, reason unknown. --> + + <para>1999-12-23: In &v4l2-vbi-format; the +<structfield>reserved1</structfield> field became +<structfield>offset</structfield>. Previously drivers were required to +clear the <structfield>reserved1</structfield> field.</para> + + <para>2000-01-13: The + <constant>V4L2_FMT_FLAG_NOT_INTERLACED</constant> flag was added.</para> + + <para>2000-07-31: The <filename>linux/poll.h</filename> header +is now included by <filename>videodev.h</filename> for compatibility +with the original <filename>videodev.h</filename> file.</para> + + <para>2000-11-20: <constant>V4L2_TYPE_VBI_OUTPUT</constant> and +<constant>V4L2_PIX_FMT_Y41P</constant> were added.</para> + + <para>2000-11-25: <constant>V4L2_TYPE_VBI_INPUT</constant> was +added.</para> + + <para>2000-12-04: A couple typos in symbol names were fixed.</para> + + <para>2001-01-18: To avoid namespace conflicts the +<constant>fourcc</constant> macro defined in the +<filename>videodev.h</filename> header file was renamed to +<constant>v4l2_fourcc</constant>.</para> + + <para>2001-01-25: A possible driver-level compatibility problem +between the <filename>videodev.h</filename> file in Linux 2.4.0 and +the <filename>videodev.h</filename> file included in the +<filename>videodevX</filename> patch was fixed. Users of an earlier +version of <filename>videodevX</filename> on Linux 2.4.0 should +recompile their V4L and V4L2 drivers.</para> + + <para>2001-01-26: A possible kernel-level incompatibility +between the <filename>videodev.h</filename> file in the +<filename>videodevX</filename> patch and the +<filename>videodev.h</filename> file in Linux 2.2.x with devfs patches +applied was fixed.</para> + + <para>2001-03-02: Certain V4L ioctls which pass data in both +direction although they are defined with read-only parameter, did not +work correctly through the backward compatibility layer. +[Solution?]</para> + + <para>2001-04-13: Big endian 16-bit RGB formats were added.</para> + + <para>2001-09-17: New YUV formats and the &VIDIOC-G-FREQUENCY; and +&VIDIOC-S-FREQUENCY; ioctls were added. (The old +<constant>VIDIOC_G_FREQ</constant> and +<constant>VIDIOC_S_FREQ</constant> ioctls did not take multiple tuners +into account.)</para> + + <para>2000-09-18: <constant>V4L2_BUF_TYPE_VBI</constant> was +added. This may <emphasis>break compatibility</emphasis> as the +&VIDIOC-G-FMT; and &VIDIOC-S-FMT; ioctls may fail now if the struct +<structname>v4l2_fmt</structname> <structfield>type</structfield> +field does not contain <constant>V4L2_BUF_TYPE_VBI</constant>. In the +documentation of the &v4l2-vbi-format; +<structfield>offset</structfield> field the ambiguous phrase "rising +edge" was changed to "leading edge".</para> + </section> + + <section> + <title>V4L2 Version 0.20 2000-11-23</title> + + <para>A number of changes were made to the raw VBI +interface.</para> + + <orderedlist> + <listitem> + <para>Figures clarifying the line numbering scheme were +added to the V4L2 API specification. The +<structfield>start</structfield>[0] and +<structfield>start</structfield>[1] fields no longer count line +numbers beginning at zero. Rationale: a) The previous definition was +unclear. b) The <structfield>start</structfield>[] values are ordinal +numbers. c) There is no point in inventing a new line numbering +scheme. We now use line number as defined by ITU-R, period. +Compatibility: Add one to the start values. Applications depending on +the previous semantics may not function correctly.</para> + </listitem> + + <listitem> + <para>The restriction "count[0] > 0 and count[1] > 0" +has been relaxed to "(count[0] + count[1]) > 0". Rationale: +Drivers may allocate resources at scan line granularity and some data +services are transmitted only on the first field. The comment that +both <structfield>count</structfield> values will usually be equal is +misleading and pointless and has been removed. This change +<emphasis>breaks compatibility</emphasis> with earlier versions: +Drivers may return EINVAL, applications may not function +correctly.</para> + </listitem> + + <listitem> + <para>Drivers are again permitted to return negative +(unknown) start values as proposed earlier. Why this feature was +dropped is unclear. This change may <emphasis>break +compatibility</emphasis> with applications depending on the start +values being positive. The use of <constant>EBUSY</constant> and +<constant>EINVAL</constant> error codes with the &VIDIOC-S-FMT; ioctl +was clarified. The &EBUSY; was finally documented, and the +<structfield>reserved2</structfield> field which was previously +mentioned only in the <filename>videodev.h</filename> header +file.</para> + </listitem> + + <listitem> + <para>New buffer types +<constant>V4L2_TYPE_VBI_INPUT</constant> and +<constant>V4L2_TYPE_VBI_OUTPUT</constant> were added. The former is an +alias for the old <constant>V4L2_TYPE_VBI</constant>, the latter was +missing in the <filename>videodev.h</filename> file.</para> + </listitem> + </orderedlist> + </section> + + <section> + <title>V4L2 Version 0.20 2002-07-25</title> + <para>Added sliced VBI interface proposal.</para> + </section> + + <section> + <title>V4L2 in Linux 2.5.46, 2002-10</title> + + <para>Around October-November 2002, prior to an announced +feature freeze of Linux 2.5, the API was revised, drawing from +experience with V4L2 0.20. This unnamed version was finally merged +into Linux 2.5.46.</para> + + <orderedlist> + <listitem> + <para>As specified in <xref linkend="related" />, drivers +must make related device functions available under all minor device +numbers.</para> + </listitem> + + <listitem> + <para>The &func-open; function requires access mode +<constant>O_RDWR</constant> regardless of the device type. All V4L2 +drivers exchanging data with applications must support the +<constant>O_NONBLOCK</constant> flag. The <constant>O_NOIO</constant> +flag, a V4L2 symbol which aliased the meaningless +<constant>O_TRUNC</constant> to indicate accesses without data +exchange (panel applications) was dropped. Drivers must stay in "panel +mode" until the application attempts to initiate a data exchange, see +<xref linkend="open" />.</para> + </listitem> + + <listitem> + <para>The &v4l2-capability; changed dramatically. Note that +also the size of the structure changed, which is encoded in the ioctl +request code, thus older V4L2 devices will respond with an &EINVAL; to +the new &VIDIOC-QUERYCAP; ioctl.</para> + + <para>There are new fields to identify the driver, a new RDS +device function <constant>V4L2_CAP_RDS_CAPTURE</constant>, the +<constant>V4L2_CAP_AUDIO</constant> flag indicates if the device has +any audio connectors, another I/O capability +<constant>V4L2_CAP_ASYNCIO</constant> can be flagged. In response to +these changes the <structfield>type</structfield> field became a bit +set and was merged into the <structfield>flags</structfield> field. +<constant>V4L2_FLAG_TUNER</constant> was renamed to +<constant>V4L2_CAP_TUNER</constant>, +<constant>V4L2_CAP_VIDEO_OVERLAY</constant> replaced +<constant>V4L2_FLAG_PREVIEW</constant> and +<constant>V4L2_CAP_VBI_CAPTURE</constant> and +<constant>V4L2_CAP_VBI_OUTPUT</constant> replaced +<constant>V4L2_FLAG_DATA_SERVICE</constant>. +<constant>V4L2_FLAG_READ</constant> and +<constant>V4L2_FLAG_WRITE</constant> were merged into +<constant>V4L2_CAP_READWRITE</constant>.</para> + + <para>The redundant fields +<structfield>inputs</structfield>, <structfield>outputs</structfield> +and <structfield>audios</structfield> were removed. These properties +can be determined as described in <xref linkend="video" /> and <xref +linkend="audio" />.</para> + + <para>The somewhat volatile and therefore barely useful +fields <structfield>maxwidth</structfield>, +<structfield>maxheight</structfield>, +<structfield>minwidth</structfield>, +<structfield>minheight</structfield>, +<structfield>maxframerate</structfield> were removed. This information +is available as described in <xref linkend="format" /> and +<xref linkend="standard" />.</para> + + <para><constant>V4L2_FLAG_SELECT</constant> was removed. We +believe the select() function is important enough to require support +of it in all V4L2 drivers exchanging data with applications. The +redundant <constant>V4L2_FLAG_MONOCHROME</constant> flag was removed, +this information is available as described in <xref + linkend="format" />.</para> + </listitem> + + <listitem> + <para>In &v4l2-input; the +<structfield>assoc_audio</structfield> field and the +<structfield>capability</structfield> field and its only flag +<constant>V4L2_INPUT_CAP_AUDIO</constant> was replaced by the new +<structfield>audioset</structfield> field. Instead of linking one +video input to one audio input this field reports all audio inputs +this video input combines with.</para> + + <para>New fields are <structfield>tuner</structfield> +(reversing the former link from tuners to video inputs), +<structfield>std</structfield> and +<structfield>status</structfield>.</para> + + <para>Accordingly &v4l2-output; lost its +<structfield>capability</structfield> and +<structfield>assoc_audio</structfield> fields. +<structfield>audioset</structfield>, +<structfield>modulator</structfield> and +<structfield>std</structfield> where added instead.</para> + </listitem> + + <listitem> + <para>The &v4l2-audio; field +<structfield>audio</structfield> was renamed to +<structfield>index</structfield>, for consistency with other +structures. A new capability flag +<constant>V4L2_AUDCAP_STEREO</constant> was added to indicated if the +audio input in question supports stereo sound. +<constant>V4L2_AUDCAP_EFFECTS</constant> and the corresponding +<constant>V4L2_AUDMODE</constant> flags where removed. This can be +easily implemented using controls. (However the same applies to AVL +which is still there.)</para> + + <para>Again for consistency the &v4l2-audioout; field +<structfield>audio</structfield> was renamed to +<structfield>index</structfield>.</para> + </listitem> + + <listitem> + <para>The &v4l2-tuner; +<structfield>input</structfield> field was replaced by an +<structfield>index</structfield> field, permitting devices with +multiple tuners. The link between video inputs and tuners is now +reversed, inputs point to their tuner. The +<structfield>std</structfield> substructure became a +simple set (more about this below) and moved into &v4l2-input;. A +<structfield>type</structfield> field was added.</para> + + <para>Accordingly in &v4l2-modulator; the +<structfield>output</structfield> was replaced by an +<structfield>index</structfield> field.</para> + + <para>In &v4l2-frequency; the +<structfield>port</structfield> field was replaced by a +<structfield>tuner</structfield> field containing the respective tuner +or modulator index number. A tuner <structfield>type</structfield> +field was added and the <structfield>reserved</structfield> field +became larger for future extensions (satellite tuners in +particular).</para> + </listitem> + + <listitem> + <para>The idea of completely transparent video standards was +dropped. Experience showed that applications must be able to work with +video standards beyond presenting the user a menu. Instead of +enumerating supported standards with an ioctl applications can now +refer to standards by &v4l2-std-id; and symbols defined in the +<filename>videodev2.h</filename> header file. For details see <xref + linkend="standard" />. The &VIDIOC-G-STD; and +&VIDIOC-S-STD; now take a pointer to this type as argument. +&VIDIOC-QUERYSTD; was added to autodetect the received standard, if +the hardware has this capability. In &v4l2-standard; an +<structfield>index</structfield> field was added for &VIDIOC-ENUMSTD;. +A &v4l2-std-id; field named <structfield>id</structfield> was added as +machine readable identifier, also replacing the +<structfield>transmission</structfield> field. The misleading +<structfield>framerate</structfield> field was renamed +to <structfield>frameperiod</structfield>. The now obsolete +<structfield>colorstandard</structfield> information, originally +needed to distguish between variations of standards, were +removed.</para> + + <para>Struct <structname>v4l2_enumstd</structname> ceased to +be. &VIDIOC-ENUMSTD; now takes a pointer to a &v4l2-standard; +directly. The information which standards are supported by a +particular video input or output moved into &v4l2-input; and +&v4l2-output; fields named <structfield>std</structfield>, +respectively.</para> + </listitem> + + <listitem> + <para>The &v4l2-queryctrl; fields +<structfield>category</structfield> and +<structfield>group</structfield> did not catch on and/or were not +implemented as expected and therefore removed.</para> + </listitem> + + <listitem> + <para>The &VIDIOC-TRY-FMT; ioctl was added to negotiate data +formats as with &VIDIOC-S-FMT;, but without the overhead of +programming the hardware and regardless of I/O in progress.</para> + + <para>In &v4l2-format; the <structfield>fmt</structfield> +union was extended to contain &v4l2-window;. All image format +negotiations are now possible with <constant>VIDIOC_G_FMT</constant>, +<constant>VIDIOC_S_FMT</constant> and +<constant>VIDIOC_TRY_FMT</constant>; ioctl. The +<constant>VIDIOC_G_WIN</constant> and +<constant>VIDIOC_S_WIN</constant> ioctls to prepare for a video +overlay were removed. The <structfield>type</structfield> field +changed to type &v4l2-buf-type; and the buffer type names changed as +follows.<informaltable> + <tgroup cols="2"> + <thead> + <row> + <entry>Old defines</entry> + <entry>&v4l2-buf-type;</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry><constant>V4L2_BUF_TYPE_CAPTURE</constant></entry> + <entry><constant>V4L2_BUF_TYPE_VIDEO_CAPTURE</constant></entry> + </row> + <row> + <entry><constant>V4L2_BUF_TYPE_CODECIN</constant></entry> + <entry>Omitted for now</entry> + </row> + <row> + <entry><constant>V4L2_BUF_TYPE_CODECOUT</constant></entry> + <entry>Omitted for now</entry> + </row> + <row> + <entry><constant>V4L2_BUF_TYPE_EFFECTSIN</constant></entry> + <entry>Omitted for now</entry> + </row> + <row> + <entry><constant>V4L2_BUF_TYPE_EFFECTSIN2</constant></entry> + <entry>Omitted for now</entry> + </row> + <row> + <entry><constant>V4L2_BUF_TYPE_EFFECTSOUT</constant></entry> + <entry>Omitted for now</entry> + </row> + <row> + <entry><constant>V4L2_BUF_TYPE_VIDEOOUT</constant></entry> + <entry><constant>V4L2_BUF_TYPE_VIDEO_OUTPUT</constant></entry> + </row> + <row> + <entry><constant>-</constant></entry> + <entry><constant>V4L2_BUF_TYPE_VIDEO_OVERLAY</constant></entry> + </row> + <row> + <entry><constant>-</constant></entry> + <entry><constant>V4L2_BUF_TYPE_VBI_CAPTURE</constant></entry> + </row> + <row> + <entry><constant>-</constant></entry> + <entry><constant>V4L2_BUF_TYPE_VBI_OUTPUT</constant></entry> + </row> + <row> + <entry><constant>-</constant></entry> + <entry><constant>V4L2_BUF_TYPE_SLICED_VBI_CAPTURE</constant></entry> + </row> + <row> + <entry><constant>-</constant></entry> + <entry><constant>V4L2_BUF_TYPE_SLICED_VBI_OUTPUT</constant></entry> + </row> + <row> + <entry><constant>V4L2_BUF_TYPE_PRIVATE_BASE</constant></entry> + <entry><constant>V4L2_BUF_TYPE_PRIVATE</constant> (but this is deprecated)</entry> + </row> + </tbody> + </tgroup> + </informaltable></para> + </listitem> + + <listitem> + <para>In &v4l2-fmtdesc; a &v4l2-buf-type; field named +<structfield>type</structfield> was added as in &v4l2-format;. The +<constant>VIDIOC_ENUM_FBUFFMT</constant> ioctl is no longer needed and +was removed. These calls can be replaced by &VIDIOC-ENUM-FMT; with +type <constant>V4L2_BUF_TYPE_VIDEO_OVERLAY</constant>.</para> + </listitem> + + <listitem> + <para>In &v4l2-pix-format; the +<structfield>depth</structfield> field was removed, assuming +applications which recognize the format by its four-character-code +already know the color depth, and others do not care about it. The +same rationale lead to the removal of the +<constant>V4L2_FMT_FLAG_COMPRESSED</constant> flag. The +<constant>V4L2_FMT_FLAG_SWCONVECOMPRESSED</constant> flag was removed +because drivers are not supposed to convert images in kernel space. A +user library of conversion functions should be provided instead. The +<constant>V4L2_FMT_FLAG_BYTESPERLINE</constant> flag was redundant. +Applications can set the <structfield>bytesperline</structfield> field +to zero to get a reasonable default. Since the remaining flags were +replaced as well, the <structfield>flags</structfield> field itself +was removed.</para> + <para>The interlace flags were replaced by a &v4l2-field; +value in a newly added <structfield>field</structfield> +field.<informaltable> + <tgroup cols="2"> + <thead> + <row> + <entry>Old flag</entry> + <entry>&v4l2-field;</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry><constant>V4L2_FMT_FLAG_NOT_INTERLACED</constant></entry> + <entry>?</entry> + </row> + <row> + <entry><constant>V4L2_FMT_FLAG_INTERLACED</constant> += <constant>V4L2_FMT_FLAG_COMBINED</constant></entry> + <entry><constant>V4L2_FIELD_INTERLACED</constant></entry> + </row> + <row> + <entry><constant>V4L2_FMT_FLAG_TOPFIELD</constant> += <constant>V4L2_FMT_FLAG_ODDFIELD</constant></entry> + <entry><constant>V4L2_FIELD_TOP</constant></entry> + </row> + <row> + <entry><constant>V4L2_FMT_FLAG_BOTFIELD</constant> += <constant>V4L2_FMT_FLAG_EVENFIELD</constant></entry> + <entry><constant>V4L2_FIELD_BOTTOM</constant></entry> + </row> + <row> + <entry><constant>-</constant></entry> + <entry><constant>V4L2_FIELD_SEQ_TB</constant></entry> + </row> + <row> + <entry><constant>-</constant></entry> + <entry><constant>V4L2_FIELD_SEQ_BT</constant></entry> + </row> + <row> + <entry><constant>-</constant></entry> + <entry><constant>V4L2_FIELD_ALTERNATE</constant></entry> + </row> + </tbody> + </tgroup> + </informaltable></para> + + <para>The color space flags were replaced by a +&v4l2-colorspace; value in a newly added +<structfield>colorspace</structfield> field, where one of +<constant>V4L2_COLORSPACE_SMPTE170M</constant>, +<constant>V4L2_COLORSPACE_BT878</constant>, +<constant>V4L2_COLORSPACE_470_SYSTEM_M</constant> or +<constant>V4L2_COLORSPACE_470_SYSTEM_BG</constant> replaces +<constant>V4L2_FMT_CS_601YUV</constant>.</para> + </listitem> + + <listitem> + <para>In &v4l2-requestbuffers; the +<structfield>type</structfield> field was properly defined as +&v4l2-buf-type;. Buffer types changed as mentioned above. A new +<structfield>memory</structfield> field of type &v4l2-memory; was +added to distinguish between I/O methods using buffers allocated +by the driver or the application. See <xref linkend="io" /> for +details.</para> + </listitem> + + <listitem> + <para>In &v4l2-buffer; the <structfield>type</structfield> +field was properly defined as &v4l2-buf-type;. Buffer types changed as +mentioned above. A <structfield>field</structfield> field of type +&v4l2-field; was added to indicate if a buffer contains a top or +bottom field. The old field flags were removed. Since no unadjusted +system time clock was added to the kernel as planned, the +<structfield>timestamp</structfield> field changed back from type +stamp_t, an unsigned 64 bit integer expressing the sample time in +nanoseconds, to struct <structname>timeval</structname>. With the +addition of a second memory mapping method the +<structfield>offset</structfield> field moved into union +<structfield>m</structfield>, and a new +<structfield>memory</structfield> field of type &v4l2-memory; was +added to distinguish between I/O methods. See <xref linkend="io" /> +for details.</para> + + <para>The <constant>V4L2_BUF_REQ_CONTIG</constant> +flag was used by the V4L compatibility layer, after changes to this +code it was no longer needed. The +<constant>V4L2_BUF_ATTR_DEVICEMEM</constant> flag would indicate if +the buffer was indeed allocated in device memory rather than DMA-able +system memory. It was barely useful and so was removed.</para> + </listitem> + + <listitem> + <para>In &v4l2-framebuffer; the +<structfield>base[3]</structfield> array anticipating double- and +triple-buffering in off-screen video memory, however without defining +a synchronization mechanism, was replaced by a single pointer. The +<constant>V4L2_FBUF_CAP_SCALEUP</constant> and +<constant>V4L2_FBUF_CAP_SCALEDOWN</constant> flags were removed. +Applications can determine this capability more accurately using the +new cropping and scaling interface. The +<constant>V4L2_FBUF_CAP_CLIPPING</constant> flag was replaced by +<constant>V4L2_FBUF_CAP_LIST_CLIPPING</constant> and +<constant>V4L2_FBUF_CAP_BITMAP_CLIPPING</constant>.</para> + </listitem> + + <listitem> + <para>In &v4l2-clip; the <structfield>x</structfield>, +<structfield>y</structfield>, <structfield>width</structfield> and +<structfield>height</structfield> field moved into a +<structfield>c</structfield> substructure of type &v4l2-rect;. The +<structfield>x</structfield> and <structfield>y</structfield> fields +were renamed to <structfield>left</structfield> and +<structfield>top</structfield>, &ie; offsets to a context dependent +origin.</para> + </listitem> + + <listitem> + <para>In &v4l2-window; the <structfield>x</structfield>, +<structfield>y</structfield>, <structfield>width</structfield> and +<structfield>height</structfield> field moved into a +<structfield>w</structfield> substructure as above. A +<structfield>field</structfield> field of type %v4l2-field; was added +to distinguish between field and frame (interlaced) overlay.</para> + </listitem> + + <listitem> + <para>The digital zoom interface, including struct +<structname>v4l2_zoomcap</structname>, struct +<structname>v4l2_zoom</structname>, +<constant>V4L2_ZOOM_NONCAP</constant> and +<constant>V4L2_ZOOM_WHILESTREAMING</constant> was replaced by a new +cropping and scaling interface. The previously unused struct +<structname>v4l2_cropcap</structname> and +<structname>v4l2_crop</structname> where redefined for this purpose. +See <xref linkend="crop" /> for details.</para> + </listitem> + + <listitem> + <para>In &v4l2-vbi-format; the +<structfield>SAMPLE_FORMAT</structfield> field now contains a +four-character-code as used to identify video image formats and +<constant>V4L2_PIX_FMT_GREY</constant> replaces the +<constant>V4L2_VBI_SF_UBYTE</constant> define. The +<structfield>reserved</structfield> field was extended.</para> + </listitem> + + <listitem> + <para>In &v4l2-captureparm; the type of the +<structfield>timeperframe</structfield> field changed from unsigned +long to &v4l2-fract;. This allows the accurate expression of multiples +of the NTSC-M frame rate 30000 / 1001. A new field +<structfield>readbuffers</structfield> was added to control the driver +behaviour in read I/O mode.</para> + + <para>Similar changes were made to &v4l2-outputparm;.</para> + </listitem> + + <listitem> + <para>The struct <structname>v4l2_performance</structname> +and <constant>VIDIOC_G_PERF</constant> ioctl were dropped. Except when +using the <link linkend="rw">read/write I/O method</link>, which is +limited anyway, this information is already available to +applications.</para> + </listitem> + + <listitem> + <para>The example transformation from RGB to YCbCr color +space in the old V4L2 documentation was inaccurate, this has been +corrected in <xref linkend="pixfmt" />.<!-- 0.5670G should be +0.587, and 127/112 != 255/224 --></para> + </listitem> + </orderedlist> + </section> + + <section> + <title>V4L2 2003-06-19</title> + + <orderedlist> + <listitem> + <para>A new capability flag +<constant>V4L2_CAP_RADIO</constant> was added for radio devices. Prior +to this change radio devices would identify solely by having exactly one +tuner whose type field reads <constant>V4L2_TUNER_RADIO</constant>.</para> + </listitem> + + <listitem> + <para>An optional driver access priority mechanism was +added, see <xref linkend="app-pri" /> for details.</para> + </listitem> + + <listitem> + <para>The audio input and output interface was found to be +incomplete.</para> + <para>Previously the &VIDIOC-G-AUDIO; +ioctl would enumerate the available audio inputs. An ioctl to +determine the current audio input, if more than one combines with the +current video input, did not exist. So +<constant>VIDIOC_G_AUDIO</constant> was renamed to +<constant>VIDIOC_G_AUDIO_OLD</constant>, this ioctl was removed on +Kernel 2.6.39. The &VIDIOC-ENUMAUDIO; ioctl was added to enumerate +audio inputs, while &VIDIOC-G-AUDIO; now reports the current audio +input.</para> + <para>The same changes were made to &VIDIOC-G-AUDOUT; and +&VIDIOC-ENUMAUDOUT;.</para> + <para>Until further the "videodev" module will automatically +translate between the old and new ioctls, but drivers and applications +must be updated to successfully compile again.</para> + </listitem> + + <listitem> + <para>The &VIDIOC-OVERLAY; ioctl was incorrectly defined with +write-read parameter. It was changed to write-only, while the write-read +version was renamed to <constant>VIDIOC_OVERLAY_OLD</constant>. The old +ioctl was removed on Kernel 2.6.39. Until further the "videodev" +kernel module will automatically translate to the new version, so drivers +must be recompiled, but not applications.</para> + </listitem> + + <listitem> + <para><xref linkend="overlay" /> incorrectly stated that +clipping rectangles define regions where the video can be seen. +Correct is that clipping rectangles define regions where +<emphasis>no</emphasis> video shall be displayed and so the graphics +surface can be seen.</para> + </listitem> + + <listitem> + <para>The &VIDIOC-S-PARM; and &VIDIOC-S-CTRL; ioctls were +defined with write-only parameter, inconsistent with other ioctls +modifying their argument. They were changed to write-read, while a +<constant>_OLD</constant> suffix was added to the write-only versions. +The old ioctls were removed on Kernel 2.6.39. Drivers and +applications assuming a constant parameter need an update.</para> + </listitem> + </orderedlist> + </section> + + <section> + <title>V4L2 2003-11-05</title> + <orderedlist> + <listitem> + <para>In <xref linkend="pixfmt-rgb" /> the following pixel +formats were incorrectly transferred from Bill Dirks' V4L2 +specification. Descriptions below refer to bytes in memory, in +ascending address order.<informaltable> + <tgroup cols="3"> + <thead> + <row> + <entry>Symbol</entry> + <entry>In this document prior to revision +0.5</entry> + <entry>Corrected</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry><constant>V4L2_PIX_FMT_RGB24</constant></entry> + <entry>B, G, R</entry> + <entry>R, G, B</entry> + </row> + <row> + <entry><constant>V4L2_PIX_FMT_BGR24</constant></entry> + <entry>R, G, B</entry> + <entry>B, G, R</entry> + </row> + <row> + <entry><constant>V4L2_PIX_FMT_RGB32</constant></entry> + <entry>B, G, R, X</entry> + <entry>R, G, B, X</entry> + </row> + <row> + <entry><constant>V4L2_PIX_FMT_BGR32</constant></entry> + <entry>R, G, B, X</entry> + <entry>B, G, R, X</entry> + </row> + </tbody> + </tgroup> + </informaltable> The +<constant>V4L2_PIX_FMT_BGR24</constant> example was always +correct.</para> + <para>In <xref linkend="v4l-image-properties" /> the mapping +of the V4L <constant>VIDEO_PALETTE_RGB24</constant> and +<constant>VIDEO_PALETTE_RGB32</constant> formats to V4L2 pixel formats +was accordingly corrected.</para> + </listitem> + + <listitem> + <para>Unrelated to the fixes above, drivers may still +interpret some V4L2 RGB pixel formats differently. These issues have +yet to be addressed, for details see <xref + linkend="pixfmt-rgb" />.</para> + </listitem> + </orderedlist> + </section> + + <section> + <title>V4L2 in Linux 2.6.6, 2004-05-09</title> + <orderedlist> + <listitem> + <para>The &VIDIOC-CROPCAP; ioctl was incorrectly defined +with read-only parameter. It is now defined as write-read ioctl, while +the read-only version was renamed to +<constant>VIDIOC_CROPCAP_OLD</constant>. The old ioctl was removed +on Kernel 2.6.39.</para> + </listitem> + </orderedlist> + </section> + + <section> + <title>V4L2 in Linux 2.6.8</title> + <orderedlist> + <listitem> + <para>A new field <structfield>input</structfield> (former +<structfield>reserved[0]</structfield>) was added to the &v4l2-buffer; +structure. Purpose of this field is to alternate between video inputs +(⪚ cameras) in step with the video capturing process. This function +must be enabled with the new <constant>V4L2_BUF_FLAG_INPUT</constant> +flag. The <structfield>flags</structfield> field is no longer +read-only.</para> + </listitem> + </orderedlist> + </section> + + <section> + <title>V4L2 spec erratum 2004-08-01</title> + + <orderedlist> + <listitem> + <para>The return value of the +<xref linkend="func-open" /> function was incorrectly documented.</para> + </listitem> + + <listitem> + <para>Audio output ioctls end in -AUDOUT, not -AUDIOOUT.</para> + </listitem> + + <listitem> + <para>In the Current Audio Input example the +<constant>VIDIOC_G_AUDIO</constant> ioctl took the wrong +argument.</para> + </listitem> + + <listitem> + <para>The documentation of the &VIDIOC-QBUF; and +&VIDIOC-DQBUF; ioctls did not mention the &v4l2-buffer; +<structfield>memory</structfield> field. It was also missing from +examples. Also on the <constant>VIDIOC_DQBUF</constant> page the &EIO; +was not documented.</para> + </listitem> + </orderedlist> + </section> + + <section> + <title>V4L2 in Linux 2.6.14</title> + <orderedlist> + <listitem> + <para>A new sliced VBI interface was added. It is documented +in <xref linkend="sliced" /> and replaces the interface first +proposed in V4L2 specification 0.8.</para> + </listitem> + </orderedlist> + </section> + + <section> + <title>V4L2 in Linux 2.6.15</title> + <orderedlist> + <listitem> + <para>The &VIDIOC-LOG-STATUS; ioctl was added.</para> + </listitem> + + <listitem> + <para>New video standards +<constant>V4L2_STD_NTSC_443</constant>, +<constant>V4L2_STD_SECAM_LC</constant>, +<constant>V4L2_STD_SECAM_DK</constant> (a set of SECAM D, K and K1), +and <constant>V4L2_STD_ATSC</constant> (a set of +<constant>V4L2_STD_ATSC_8_VSB</constant> and +<constant>V4L2_STD_ATSC_16_VSB</constant>) were defined. Note the +<constant>V4L2_STD_525_60</constant> set now includes +<constant>V4L2_STD_NTSC_443</constant>. See also <xref + linkend="v4l2-std-id" />.</para> + </listitem> + + <listitem> + <para>The <constant>VIDIOC_G_COMP</constant> and +<constant>VIDIOC_S_COMP</constant> ioctl were renamed to +<constant>VIDIOC_G_MPEGCOMP</constant> and +<constant>VIDIOC_S_MPEGCOMP</constant> respectively. Their argument +was replaced by a struct +<structname>v4l2_mpeg_compression</structname> pointer. (The +<constant>VIDIOC_G_MPEGCOMP</constant> and +<constant>VIDIOC_S_MPEGCOMP</constant> ioctls where removed in Linux +2.6.25.)</para> + </listitem> + </orderedlist> + </section> + + <section> + <title>V4L2 spec erratum 2005-11-27</title> + <para>The capture example in <xref linkend="capture-example" /> +called the &VIDIOC-S-CROP; ioctl without checking if cropping is +supported. In the video standard selection example in +<xref linkend="standard" /> the &VIDIOC-S-STD; call used the wrong +argument type.</para> + </section> + + <section> + <title>V4L2 spec erratum 2006-01-10</title> + <orderedlist> + <listitem> + <para>The <constant>V4L2_IN_ST_COLOR_KILL</constant> flag in +&v4l2-input; not only indicates if the color killer is enabled, but +also if it is active. (The color killer disables color decoding when +it detects no color in the video signal to improve the image +quality.)</para> + </listitem> + + <listitem> + <para>&VIDIOC-S-PARM; is a write-read ioctl, not write-only as +stated on its reference page. The ioctl changed in 2003 as noted above.</para> + </listitem> + </orderedlist> + </section> + + <section> + <title>V4L2 spec erratum 2006-02-03</title> + <orderedlist> + <listitem> + <para>In &v4l2-captureparm; and &v4l2-outputparm; the +<structfield>timeperframe</structfield> field gives the time in +seconds, not microseconds.</para> + </listitem> + </orderedlist> + </section> + + <section> + <title>V4L2 spec erratum 2006-02-04</title> + <orderedlist> + <listitem> + <para>The <structfield>clips</structfield> field in +&v4l2-window; must point to an array of &v4l2-clip;, not a linked +list, because drivers ignore the struct +<structname>v4l2_clip</structname>.<structfield>next</structfield> +pointer.</para> + </listitem> + </orderedlist> + </section> + + <section> + <title>V4L2 in Linux 2.6.17</title> + <orderedlist> + <listitem> + <para>New video standard macros were added: +<constant>V4L2_STD_NTSC_M_KR</constant> (NTSC M South Korea), and the +sets <constant>V4L2_STD_MN</constant>, +<constant>V4L2_STD_B</constant>, <constant>V4L2_STD_GH</constant> and +<constant>V4L2_STD_DK</constant>. The +<constant>V4L2_STD_NTSC</constant> and +<constant>V4L2_STD_SECAM</constant> sets now include +<constant>V4L2_STD_NTSC_M_KR</constant> and +<constant>V4L2_STD_SECAM_LC</constant> respectively.</para> + </listitem> + + <listitem> + <para>A new <constant>V4L2_TUNER_MODE_LANG1_LANG2</constant> +was defined to record both languages of a bilingual program. The +use of <constant>V4L2_TUNER_MODE_STEREO</constant> for this purpose +is deprecated now. See the &VIDIOC-G-TUNER; section for +details.</para> + </listitem> + </orderedlist> + </section> + + <section> + <title>V4L2 spec erratum 2006-09-23 (Draft 0.15)</title> + <orderedlist> + <listitem> + <para>In various places +<constant>V4L2_BUF_TYPE_SLICED_VBI_CAPTURE</constant> and +<constant>V4L2_BUF_TYPE_SLICED_VBI_OUTPUT</constant> of the sliced VBI +interface were not mentioned along with other buffer types.</para> + </listitem> + + <listitem> + <para>In <xref linkend="vidioc-g-audio" /> it was clarified +that the &v4l2-audio; <structfield>mode</structfield> field is a flags +field.</para> + </listitem> + + <listitem> + <para><xref linkend="vidioc-querycap" /> did not mention the +sliced VBI and radio capability flags.</para> + </listitem> + + <listitem> + <para>In <xref linkend="vidioc-g-frequency" /> it was +clarified that applications must initialize the tuner +<structfield>type</structfield> field of &v4l2-frequency; before +calling &VIDIOC-S-FREQUENCY;.</para> + </listitem> + + <listitem> + <para>The <structfield>reserved</structfield> array +in &v4l2-requestbuffers; has 2 elements, not 32.</para> + </listitem> + + <listitem> + <para>In <xref linkend="output" /> and <xref + linkend="raw-vbi" /> the device file names +<filename>/dev/vout</filename> which never caught on were replaced +by <filename>/dev/video</filename>.</para> + </listitem> + + <listitem> + <para>With Linux 2.6.15 the possible range for VBI device minor +numbers was extended from 224-239 to 224-255. Accordingly device file names +<filename>/dev/vbi0</filename> to <filename>/dev/vbi31</filename> are +possible now.</para> + </listitem> + </orderedlist> + </section> + + <section> + <title>V4L2 in Linux 2.6.18</title> + <orderedlist> + <listitem> + <para>New ioctls &VIDIOC-G-EXT-CTRLS;, &VIDIOC-S-EXT-CTRLS; +and &VIDIOC-TRY-EXT-CTRLS; were added, a flag to skip unsupported +controls with &VIDIOC-QUERYCTRL;, new control types +<constant>V4L2_CTRL_TYPE_INTEGER64</constant> and +<constant>V4L2_CTRL_TYPE_CTRL_CLASS</constant> (<xref + linkend="v4l2-ctrl-type" />), and new control flags +<constant>V4L2_CTRL_FLAG_READ_ONLY</constant>, +<constant>V4L2_CTRL_FLAG_UPDATE</constant>, +<constant>V4L2_CTRL_FLAG_INACTIVE</constant> and +<constant>V4L2_CTRL_FLAG_SLIDER</constant> (<xref + linkend="control-flags" />). See <xref + linkend="extended-controls" /> for details.</para> + </listitem> + </orderedlist> + </section> + + <section> + <title>V4L2 in Linux 2.6.19</title> + <orderedlist> + <listitem> + <para>In &v4l2-sliced-vbi-cap; a buffer type field was added +replacing a reserved field. Note on architectures where the size of +enum types differs from int types the size of the structure changed. +The &VIDIOC-G-SLICED-VBI-CAP; ioctl was redefined from being read-only +to write-read. Applications must initialize the type field and clear +the reserved fields now. These changes may <emphasis>break the +compatibility</emphasis> with older drivers and applications.</para> + </listitem> + + <listitem> + <para>The ioctls &VIDIOC-ENUM-FRAMESIZES; and +&VIDIOC-ENUM-FRAMEINTERVALS; were added.</para> + </listitem> + + <listitem> + <para>A new pixel format <constant>V4L2_PIX_FMT_RGB444</constant> (<xref +linkend="rgb-formats" />) was added.</para> + </listitem> + </orderedlist> + </section> + + <section> + <title>V4L2 spec erratum 2006-10-12 (Draft 0.17)</title> + <orderedlist> + <listitem> + <para><constant>V4L2_PIX_FMT_HM12</constant> (<xref +linkend="reserved-formats" />) is a YUV 4:2:0, not 4:2:2 format.</para> + </listitem> + </orderedlist> + </section> + + <section> + <title>V4L2 in Linux 2.6.21</title> + <orderedlist> + <listitem> + <para>The <filename>videodev2.h</filename> header file is +now dual licensed under GNU General Public License version two or +later, and under a 3-clause BSD-style license.</para> + </listitem> + </orderedlist> + </section> + + <section> + <title>V4L2 in Linux 2.6.22</title> + <orderedlist> + <listitem> + <para>Two new field orders + <constant>V4L2_FIELD_INTERLACED_TB</constant> and + <constant>V4L2_FIELD_INTERLACED_BT</constant> were + added. See <xref linkend="v4l2-field" /> for details.</para> + </listitem> + + <listitem> + <para>Three new clipping/blending methods with a global or +straight or inverted local alpha value were added to the video overlay +interface. See the description of the &VIDIOC-G-FBUF; and +&VIDIOC-S-FBUF; ioctls for details.</para> + <para>A new <structfield>global_alpha</structfield> field +was added to <link +linkend="v4l2-window"><structname>v4l2_window</structname></link>, +extending the structure. This may <emphasis>break +compatibility</emphasis> with applications using a struct +<structname>v4l2_window</structname> directly. However the <link +linkend="vidioc-g-fmt">VIDIOC_G/S/TRY_FMT</link> ioctls, which take a +pointer to a <link linkend="v4l2-format">v4l2_format</link> parent +structure with padding bytes at the end, are not affected.</para> + </listitem> + + <listitem> + <para>The format of the <structfield>chromakey</structfield> +field in &v4l2-window; changed from "host order RGB32" to a pixel +value in the same format as the framebuffer. This may <emphasis>break +compatibility</emphasis> with existing applications. Drivers +supporting the "host order RGB32" format are not known.</para> + </listitem> + + </orderedlist> + </section> + + <section> + <title>V4L2 in Linux 2.6.24</title> + <orderedlist> + <listitem> + <para>The pixel formats +<constant>V4L2_PIX_FMT_PAL8</constant>, +<constant>V4L2_PIX_FMT_YUV444</constant>, +<constant>V4L2_PIX_FMT_YUV555</constant>, +<constant>V4L2_PIX_FMT_YUV565</constant> and +<constant>V4L2_PIX_FMT_YUV32</constant> were added.</para> + </listitem> + </orderedlist> + </section> + + <section> + <title>V4L2 in Linux 2.6.25</title> + <orderedlist> + <listitem> + <para>The pixel formats <link linkend="V4L2-PIX-FMT-Y16"> +<constant>V4L2_PIX_FMT_Y16</constant></link> and <link +linkend="V4L2-PIX-FMT-SBGGR16"> +<constant>V4L2_PIX_FMT_SBGGR16</constant></link> were added.</para> + </listitem> + <listitem> + <para>New <link linkend="control">controls</link> +<constant>V4L2_CID_POWER_LINE_FREQUENCY</constant>, +<constant>V4L2_CID_HUE_AUTO</constant>, +<constant>V4L2_CID_WHITE_BALANCE_TEMPERATURE</constant>, +<constant>V4L2_CID_SHARPNESS</constant> and +<constant>V4L2_CID_BACKLIGHT_COMPENSATION</constant> were added. The +controls <constant>V4L2_CID_BLACK_LEVEL</constant>, +<constant>V4L2_CID_WHITENESS</constant>, +<constant>V4L2_CID_HCENTER</constant> and +<constant>V4L2_CID_VCENTER</constant> were deprecated. +</para> + </listitem> + <listitem> + <para>A <link linkend="camera-controls">Camera controls +class</link> was added, with the new controls +<constant>V4L2_CID_EXPOSURE_AUTO</constant>, +<constant>V4L2_CID_EXPOSURE_ABSOLUTE</constant>, +<constant>V4L2_CID_EXPOSURE_AUTO_PRIORITY</constant>, +<constant>V4L2_CID_PAN_RELATIVE</constant>, +<constant>V4L2_CID_TILT_RELATIVE</constant>, +<constant>V4L2_CID_PAN_RESET</constant>, +<constant>V4L2_CID_TILT_RESET</constant>, +<constant>V4L2_CID_PAN_ABSOLUTE</constant>, +<constant>V4L2_CID_TILT_ABSOLUTE</constant>, +<constant>V4L2_CID_FOCUS_ABSOLUTE</constant>, +<constant>V4L2_CID_FOCUS_RELATIVE</constant> and +<constant>V4L2_CID_FOCUS_AUTO</constant>.</para> + </listitem> + <listitem> + <para>The <constant>VIDIOC_G_MPEGCOMP</constant> and +<constant>VIDIOC_S_MPEGCOMP</constant> ioctls, which were superseded +by the <link linkend="extended-controls">extended controls</link> +interface in Linux 2.6.18, where finally removed from the +<filename>videodev2.h</filename> header file.</para> + </listitem> + </orderedlist> + </section> + + <section> + <title>V4L2 in Linux 2.6.26</title> + <orderedlist> + <listitem> + <para>The pixel formats +<constant>V4L2_PIX_FMT_Y16</constant> and +<constant>V4L2_PIX_FMT_SBGGR16</constant> were added.</para> + </listitem> + <listitem> + <para>Added user controls +<constant>V4L2_CID_CHROMA_AGC</constant> and +<constant>V4L2_CID_COLOR_KILLER</constant>.</para> + </listitem> + </orderedlist> + </section> + + <section> + <title>V4L2 in Linux 2.6.27</title> + <orderedlist> + <listitem> + <para>The &VIDIOC-S-HW-FREQ-SEEK; ioctl and the +<constant>V4L2_CAP_HW_FREQ_SEEK</constant> capability were added.</para> + </listitem> + <listitem> + <para>The pixel formats +<constant>V4L2_PIX_FMT_YVYU</constant>, +<constant>V4L2_PIX_FMT_PCA501</constant>, +<constant>V4L2_PIX_FMT_PCA505</constant>, +<constant>V4L2_PIX_FMT_PCA508</constant>, +<constant>V4L2_PIX_FMT_PCA561</constant>, +<constant>V4L2_PIX_FMT_SGBRG8</constant>, +<constant>V4L2_PIX_FMT_PAC207</constant> and +<constant>V4L2_PIX_FMT_PJPG</constant> were added.</para> + </listitem> + </orderedlist> + </section> + + <section> + <title>V4L2 in Linux 2.6.28</title> + <orderedlist> + <listitem> + <para>Added <constant>V4L2_MPEG_AUDIO_ENCODING_AAC</constant> and +<constant>V4L2_MPEG_AUDIO_ENCODING_AC3</constant> MPEG audio encodings.</para> + </listitem> + <listitem> + <para>Added <constant>V4L2_MPEG_VIDEO_ENCODING_MPEG_4_AVC</constant> MPEG +video encoding.</para> + </listitem> + <listitem> + <para>The pixel formats +<constant>V4L2_PIX_FMT_SGRBG10</constant> and +<constant>V4L2_PIX_FMT_SGRBG10DPCM8</constant> were added.</para> + </listitem> + </orderedlist> + </section> + + <section> + <title>V4L2 in Linux 2.6.29</title> + <orderedlist> + <listitem> + <para>The <constant>VIDIOC_G_CHIP_IDENT</constant> ioctl was renamed +to <constant>VIDIOC_G_CHIP_IDENT_OLD</constant> and <constant>VIDIOC_DBG_G_CHIP_IDENT</constant> +was introduced in its place. The old struct <structname>v4l2_chip_ident</structname> +was renamed to <structname id="v4l2-chip-ident-old">v4l2_chip_ident_old</structname>.</para> + </listitem> + <listitem> + <para>The pixel formats +<constant>V4L2_PIX_FMT_VYUY</constant>, +<constant>V4L2_PIX_FMT_NV16</constant> and +<constant>V4L2_PIX_FMT_NV61</constant> were added.</para> + </listitem> + <listitem> + <para>Added camera controls +<constant>V4L2_CID_ZOOM_ABSOLUTE</constant>, +<constant>V4L2_CID_ZOOM_RELATIVE</constant>, +<constant>V4L2_CID_ZOOM_CONTINUOUS</constant> and +<constant>V4L2_CID_PRIVACY</constant>.</para> + </listitem> + </orderedlist> + </section> + <section> + <title>V4L2 in Linux 2.6.30</title> + <orderedlist> + <listitem> + <para>New control flag <constant>V4L2_CTRL_FLAG_WRITE_ONLY</constant> was added.</para> + </listitem> + <listitem> + <para>New control <constant>V4L2_CID_COLORFX</constant> was added.</para> + </listitem> + </orderedlist> + </section> + <section> + <title>V4L2 in Linux 2.6.32</title> + <orderedlist> + <listitem> + <para>In order to be easier to compare a V4L2 API and a kernel +version, now V4L2 API is numbered using the Linux Kernel version numeration.</para> + </listitem> + <listitem> + <para>Finalized the RDS capture API. See <xref linkend="rds" /> for +more information.</para> + </listitem> + <listitem> + <para>Added new capabilities for modulators and RDS encoders.</para> + </listitem> + <listitem> + <para>Add description for libv4l API.</para> + </listitem> + <listitem> + <para>Added support for string controls via new type <constant>V4L2_CTRL_TYPE_STRING</constant>.</para> + </listitem> + <listitem> + <para>Added <constant>V4L2_CID_BAND_STOP_FILTER</constant> documentation.</para> + </listitem> + <listitem> + <para>Added FM Modulator (FM TX) Extended Control Class: <constant>V4L2_CTRL_CLASS_FM_TX</constant> and their Control IDs.</para> + </listitem> +<listitem> + <para>Added FM Receiver (FM RX) Extended Control Class: <constant>V4L2_CTRL_CLASS_FM_RX</constant> and their Control IDs.</para> + </listitem> + <listitem> + <para>Added Remote Controller chapter, describing the default Remote Controller mapping for media devices.</para> + </listitem> + </orderedlist> + </section> + <section> + <title>V4L2 in Linux 2.6.33</title> + <orderedlist> + <listitem> + <para>Added support for Digital Video timings in order to support HDTV receivers and transmitters.</para> + </listitem> + </orderedlist> + </section> + <section> + <title>V4L2 in Linux 2.6.34</title> + <orderedlist> + <listitem> + <para>Added +<constant>V4L2_CID_IRIS_ABSOLUTE</constant> and +<constant>V4L2_CID_IRIS_RELATIVE</constant> controls to the + <link linkend="camera-controls">Camera controls class</link>. + </para> + </listitem> + </orderedlist> + </section> + <section> + <title>V4L2 in Linux 2.6.37</title> + <orderedlist> + <listitem> + <para>Remove the vtx (videotext/teletext) API. This API was no longer +used and no hardware exists to verify the API. Nor were any userspace applications found +that used it. It was originally scheduled for removal in 2.6.35. + </para> + </listitem> + </orderedlist> + </section> + <section> + <title>V4L2 in Linux 2.6.39</title> + <orderedlist> + <listitem> + <para>The old VIDIOC_*_OLD symbols and V4L1 support were removed.</para> + </listitem> + <listitem> + <para>Multi-planar API added. Does not affect the compatibility of + current drivers and applications. See + <link linkend="planar-apis">multi-planar API</link> + for details.</para> + </listitem> + </orderedlist> + </section> + <section> + <title>V4L2 in Linux 3.1</title> + <orderedlist> + <listitem> + <para>VIDIOC_QUERYCAP now returns a per-subsystem version instead of a per-driver one.</para> + <para>Standardize an error code for invalid ioctl.</para> + <para>Added V4L2_CTRL_TYPE_BITMASK.</para> + </listitem> + </orderedlist> + </section> + <section> + <title>V4L2 in Linux 3.2</title> + <orderedlist> + <listitem> + <para>V4L2_CTRL_FLAG_VOLATILE was added to signal volatile controls to userspace.</para> + </listitem> + <listitem> + <para>Add selection API for extended control over cropping + and composing. Does not affect the compatibility of current + drivers and applications. See <link + linkend="selection-api"> selection API </link> for + details.</para> + </listitem> + </orderedlist> + </section> + + <section> + <title>V4L2 in Linux 3.3</title> + <orderedlist> + <listitem> + <para>Added <constant>V4L2_CID_ALPHA_COMPONENT</constant> control + to the <link linkend="control">User controls class</link>. + </para> + </listitem> + <listitem> + <para>Added the device_caps field to struct v4l2_capabilities and added the new + V4L2_CAP_DEVICE_CAPS capability.</para> + </listitem> + </orderedlist> + </section> + + <section> + <title>V4L2 in Linux 3.4</title> + <orderedlist> + <listitem> + <para>Added <link linkend="jpeg-controls">JPEG compression control + class</link>.</para> + </listitem> + <listitem> + <para>Extended the DV Timings API: + &VIDIOC-ENUM-DV-TIMINGS;, &VIDIOC-QUERY-DV-TIMINGS; and + &VIDIOC-DV-TIMINGS-CAP;.</para> + </listitem> + </orderedlist> + </section> + + <section> + <title>V4L2 in Linux 3.5</title> + <orderedlist> + <listitem> + <para>Added integer menus, the new type will be + V4L2_CTRL_TYPE_INTEGER_MENU.</para> + </listitem> + <listitem> + <para>Added selection API for V4L2 subdev interface: + &VIDIOC-SUBDEV-G-SELECTION; and + &VIDIOC-SUBDEV-S-SELECTION;.</para> + </listitem> + <listitem> + <para> Added <constant>V4L2_COLORFX_ANTIQUE</constant>, + <constant>V4L2_COLORFX_ART_FREEZE</constant>, + <constant>V4L2_COLORFX_AQUA</constant>, + <constant>V4L2_COLORFX_SILHOUETTE</constant>, + <constant>V4L2_COLORFX_SOLARIZATION</constant>, + <constant>V4L2_COLORFX_VIVID</constant> and + <constant>V4L2_COLORFX_ARBITRARY_CBCR</constant> menu items + to the <constant>V4L2_CID_COLORFX</constant> control.</para> + </listitem> + <listitem> + <para> Added <constant>V4L2_CID_COLORFX_CBCR</constant> control.</para> + </listitem> + <listitem> + <para> Added camera controls <constant>V4L2_CID_AUTO_EXPOSURE_BIAS</constant>, + <constant>V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE</constant>, + <constant>V4L2_CID_IMAGE_STABILIZATION</constant>, + <constant>V4L2_CID_ISO_SENSITIVITY</constant>, + <constant>V4L2_CID_ISO_SENSITIVITY_AUTO</constant>, + <constant>V4L2_CID_EXPOSURE_METERING</constant>, + <constant>V4L2_CID_SCENE_MODE</constant>, + <constant>V4L2_CID_3A_LOCK</constant>, + <constant>V4L2_CID_AUTO_FOCUS_START</constant>, + <constant>V4L2_CID_AUTO_FOCUS_STOP</constant>, + <constant>V4L2_CID_AUTO_FOCUS_STATUS</constant> and + <constant>V4L2_CID_AUTO_FOCUS_RANGE</constant>. + </para> + </listitem> + </orderedlist> + </section> + + <section> + <title>V4L2 in Linux 3.6</title> + <orderedlist> + <listitem> + <para>Replaced <structfield>input</structfield> in + <structname>v4l2_buffer</structname> by + <structfield>reserved2</structfield> and removed + <constant>V4L2_BUF_FLAG_INPUT</constant>.</para> + </listitem> + <listitem> + <para>Added V4L2_CAP_VIDEO_M2M and V4L2_CAP_VIDEO_M2M_MPLANE capabilities.</para> + </listitem> + <listitem> + <para>Added support for frequency band enumerations: &VIDIOC-ENUM-FREQ-BANDS;.</para> + </listitem> + </orderedlist> + </section> + + <section> + <title>V4L2 in Linux 3.9</title> + <orderedlist> + <listitem> + <para>Added timestamp types to + <structfield>flags</structfield> field in + <structname>v4l2_buffer</structname>. See <xref + linkend="buffer-flags" />.</para> + </listitem> + <listitem> + <para>Added <constant>V4L2_EVENT_CTRL_CH_RANGE</constant> control event + changes flag. See <xref linkend="changes-flags"/>.</para> + </listitem> + </orderedlist> + </section> + + <section> + <title>V4L2 in Linux 3.10</title> + <orderedlist> + <listitem> + <para>Removed obsolete and unused DV_PRESET ioctls + VIDIOC_G_DV_PRESET, VIDIOC_S_DV_PRESET, VIDIOC_QUERY_DV_PRESET and + VIDIOC_ENUM_DV_PRESET. Remove the related v4l2_input/output capability + flags V4L2_IN_CAP_PRESETS and V4L2_OUT_CAP_PRESETS. + </para> + </listitem> + <listitem> + <para>Added new debugging ioctl &VIDIOC-DBG-G-CHIP-INFO;. + </para> + </listitem> + </orderedlist> + </section> + + <section> + <title>V4L2 in Linux 3.11</title> + <orderedlist> + <listitem> + <para>Remove obsolete <constant>VIDIOC_DBG_G_CHIP_IDENT</constant> ioctl. + </para> + </listitem> + </orderedlist> + </section> + + <section> + <title>V4L2 in Linux 3.14</title> + <orderedlist> + <listitem> + <para> In struct <structname>v4l2_rect</structname>, the type +of <structfield>width</structfield> and <structfield>height</structfield> +fields changed from _s32 to _u32. + </para> + </listitem> + </orderedlist> + </section> + + <section> + <title>V4L2 in Linux 3.15</title> + <orderedlist> + <listitem> + <para>Added Software Defined Radio (SDR) Interface. + </para> + </listitem> + </orderedlist> + </section> + + <section id="other"> + <title>Relation of V4L2 to other Linux multimedia APIs</title> + + <section id="xvideo"> + <title>X Video Extension</title> + + <para>The X Video Extension (abbreviated XVideo or just Xv) is +an extension of the X Window system, implemented for example by the +XFree86 project. Its scope is similar to V4L2, an API to video capture +and output devices for X clients. Xv allows applications to display +live video in a window, send window contents to a TV output, and +capture or output still images in XPixmaps<footnote> + <para>This is not implemented in XFree86.</para> + </footnote>. With their implementation XFree86 makes the +extension available across many operating systems and +architectures.</para> + + <para>Because the driver is embedded into the X server Xv has a +number of advantages over the V4L2 <link linkend="overlay">video +overlay interface</link>. The driver can easily determine the overlay +target, &ie; visible graphics memory or off-screen buffers for a +destructive overlay. It can program the RAMDAC for a non-destructive +overlay, scaling or color-keying, or the clipping functions of the +video capture hardware, always in sync with drawing operations or +windows moving or changing their stacking order.</para> + + <para>To combine the advantages of Xv and V4L a special Xv +driver exists in XFree86 and XOrg, just programming any overlay capable +Video4Linux device it finds. To enable it +<filename>/etc/X11/XF86Config</filename> must contain these lines:</para> + <para><screen> +Section "Module" + Load "v4l" +EndSection</screen></para> + + <para>As of XFree86 4.2 this driver still supports only V4L +ioctls, however it should work just fine with all V4L2 devices through +the V4L2 backward-compatibility layer. Since V4L2 permits multiple +opens it is possible (if supported by the V4L2 driver) to capture +video while an X client requested video overlay. Restrictions of +simultaneous capturing and overlay are discussed in <xref + linkend="overlay" /> apply.</para> + + <para>Only marginally related to V4L2, XFree86 extended Xv to +support hardware YUV to RGB conversion and scaling for faster video +playback, and added an interface to MPEG-2 decoding hardware. This API +is useful to display images captured with V4L2 devices.</para> + </section> + + <section> + <title>Digital Video</title> + + <para>V4L2 does not support digital terrestrial, cable or +satellite broadcast. A separate project aiming at digital receivers +exists. You can find its homepage at <ulink +url="http://linuxtv.org">http://linuxtv.org</ulink>. The Linux DVB API +has no connection to the V4L2 API except that drivers for hybrid +hardware may support both.</para> + </section> + + <section> + <title>Audio Interfaces</title> + + <para>[to do - OSS/ALSA]</para> + </section> + </section> + + <section id="experimental"> + <title>Experimental API Elements</title> + + <para>The following V4L2 API elements are currently experimental +and may change in the future.</para> + + <itemizedlist> + <listitem> + <para>Video Output Overlay (OSD) Interface, <xref + linkend="osd" />.</para> + </listitem> + <listitem> + <para>&VIDIOC-DBG-G-REGISTER; and &VIDIOC-DBG-S-REGISTER; +ioctls.</para> + </listitem> + <listitem> + <para>&VIDIOC-DBG-G-CHIP-INFO; ioctl.</para> + </listitem> + <listitem> + <para>&VIDIOC-ENUM-DV-TIMINGS;, &VIDIOC-QUERY-DV-TIMINGS; and + &VIDIOC-DV-TIMINGS-CAP; ioctls.</para> + </listitem> + <listitem> + <para>Flash API. <xref linkend="flash-controls" /></para> + </listitem> + <listitem> + <para>&VIDIOC-CREATE-BUFS; and &VIDIOC-PREPARE-BUF; ioctls.</para> + </listitem> + <listitem> + <para>Selection API. <xref linkend="selection-api" /></para> + </listitem> + <listitem> + <para>Sub-device selection API: &VIDIOC-SUBDEV-G-SELECTION; + and &VIDIOC-SUBDEV-S-SELECTION; ioctls.</para> + </listitem> + <listitem> + <para>Support for frequency band enumeration: &VIDIOC-ENUM-FREQ-BANDS; ioctl.</para> + </listitem> + <listitem> + <para>Vendor and device specific media bus pixel formats. + <xref linkend="v4l2-mbus-vendor-spec-fmts" />.</para> + </listitem> + <listitem> + <para>Importing DMABUF file descriptors as a new IO method described + in <xref linkend="dmabuf" />.</para> + </listitem> + <listitem> + <para>Exporting DMABUF files using &VIDIOC-EXPBUF; ioctl.</para> + </listitem> + <listitem> + <para>Software Defined Radio (SDR) Interface, <xref linkend="sdr" />.</para> + </listitem> + </itemizedlist> + </section> + + <section id="obsolete"> + <title>Obsolete API Elements</title> + + <para>The following V4L2 API elements were superseded by new +interfaces and should not be implemented in new drivers.</para> + + <itemizedlist> + <listitem> + <para><constant>VIDIOC_G_MPEGCOMP</constant> and +<constant>VIDIOC_S_MPEGCOMP</constant> ioctls. Use Extended Controls, +<xref linkend="extended-controls" />.</para> + </listitem> + <listitem> + <para>VIDIOC_G_DV_PRESET, VIDIOC_S_DV_PRESET, VIDIOC_ENUM_DV_PRESETS and + VIDIOC_QUERY_DV_PRESET ioctls. Use the DV Timings API (<xref linkend="dv-timings" />).</para> + </listitem> + <listitem> + <para><constant>VIDIOC_SUBDEV_G_CROP</constant> and + <constant>VIDIOC_SUBDEV_S_CROP</constant> ioctls. Use + <constant>VIDIOC_SUBDEV_G_SELECTION</constant> and + <constant>VIDIOC_SUBDEV_S_SELECTION</constant>, <xref + linkend="vidioc-subdev-g-selection" />.</para> + </listitem> + </itemizedlist> + </section> + </section> diff --git a/Documentation/DocBook/media/v4l/controls.xml b/Documentation/DocBook/media/v4l/controls.xml new file mode 100644 index 00000000000..47198eef75a --- /dev/null +++ b/Documentation/DocBook/media/v4l/controls.xml @@ -0,0 +1,5150 @@ + <section id="control"> + <title>User Controls</title> + + <para>Devices typically have a number of user-settable controls +such as brightness, saturation and so on, which would be presented to +the user on a graphical user interface. But, different devices +will have different controls available, and furthermore, the range of +possible values, and the default value will vary from device to +device. The control ioctls provide the information and a mechanism to +create a nice user interface for these controls that will work +correctly with any device.</para> + + <para>All controls are accessed using an ID value. V4L2 defines +several IDs for specific purposes. Drivers can also implement their +own custom controls using <constant>V4L2_CID_PRIVATE_BASE</constant> +and higher values. The pre-defined control IDs have the prefix +<constant>V4L2_CID_</constant>, and are listed in <xref +linkend="control-id" />. The ID is used when querying the attributes of +a control, and when getting or setting the current value.</para> + + <para>Generally applications should present controls to the user +without assumptions about their purpose. Each control comes with a +name string the user is supposed to understand. When the purpose is +non-intuitive the driver writer should provide a user manual, a user +interface plug-in or a driver specific panel application. Predefined +IDs were introduced to change a few controls programmatically, for +example to mute a device during a channel switch.</para> + + <para>Drivers may enumerate different controls after switching +the current video input or output, tuner or modulator, or audio input +or output. Different in the sense of other bounds, another default and +current value, step size or other menu items. A control with a certain +<emphasis>custom</emphasis> ID can also change name and +type.<footnote> + <para>It will be more convenient for applications if drivers +make use of the <constant>V4L2_CTRL_FLAG_DISABLED</constant> flag, but +that was never required.</para> + </footnote> Control values are stored globally, they do not +change when switching except to stay within the reported bounds. They +also do not change ⪚ when the device is opened or closed, when the +tuner radio frequency is changed or generally never without +application request. Since V4L2 specifies no event mechanism, panel +applications intended to cooperate with other panel applications (be +they built into a larger application, as a TV viewer) may need to +regularly poll control values to update their user +interface.<footnote> + <para>Applications could call an ioctl to request events. +After another process called &VIDIOC-S-CTRL; or another ioctl changing +shared properties the &func-select; function would indicate +readability until any ioctl (querying the properties) is +called.</para> + </footnote></para> + + <para> + All controls use machine endianness. + </para> + + <table pgwide="1" frame="none" id="control-id"> + <title>Control IDs</title> + <tgroup cols="3"> + &cs-def; + <thead> + <row> + <entry>ID</entry> + <entry>Type</entry> + <entry>Description</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry><constant>V4L2_CID_BASE</constant></entry> + <entry></entry> + <entry>First predefined ID, equal to +<constant>V4L2_CID_BRIGHTNESS</constant>.</entry> + </row> + <row> + <entry><constant>V4L2_CID_USER_BASE</constant></entry> + <entry></entry> + <entry>Synonym of <constant>V4L2_CID_BASE</constant>.</entry> + </row> + <row> + <entry><constant>V4L2_CID_BRIGHTNESS</constant></entry> + <entry>integer</entry> + <entry>Picture brightness, or more precisely, the black +level.</entry> + </row> + <row> + <entry><constant>V4L2_CID_CONTRAST</constant></entry> + <entry>integer</entry> + <entry>Picture contrast or luma gain.</entry> + </row> + <row> + <entry><constant>V4L2_CID_SATURATION</constant></entry> + <entry>integer</entry> + <entry>Picture color saturation or chroma gain.</entry> + </row> + <row> + <entry><constant>V4L2_CID_HUE</constant></entry> + <entry>integer</entry> + <entry>Hue or color balance.</entry> + </row> + <row> + <entry><constant>V4L2_CID_AUDIO_VOLUME</constant></entry> + <entry>integer</entry> + <entry>Overall audio volume. Note some drivers also +provide an OSS or ALSA mixer interface.</entry> + </row> + <row> + <entry><constant>V4L2_CID_AUDIO_BALANCE</constant></entry> + <entry>integer</entry> + <entry>Audio stereo balance. Minimum corresponds to all +the way left, maximum to right.</entry> + </row> + <row> + <entry><constant>V4L2_CID_AUDIO_BASS</constant></entry> + <entry>integer</entry> + <entry>Audio bass adjustment.</entry> + </row> + <row> + <entry><constant>V4L2_CID_AUDIO_TREBLE</constant></entry> + <entry>integer</entry> + <entry>Audio treble adjustment.</entry> + </row> + <row> + <entry><constant>V4L2_CID_AUDIO_MUTE</constant></entry> + <entry>boolean</entry> + <entry>Mute audio, &ie; set the volume to zero, however +without affecting <constant>V4L2_CID_AUDIO_VOLUME</constant>. Like +ALSA drivers, V4L2 drivers must mute at load time to avoid excessive +noise. Actually the entire device should be reset to a low power +consumption state.</entry> + </row> + <row> + <entry><constant>V4L2_CID_AUDIO_LOUDNESS</constant></entry> + <entry>boolean</entry> + <entry>Loudness mode (bass boost).</entry> + </row> + <row> + <entry><constant>V4L2_CID_BLACK_LEVEL</constant></entry> + <entry>integer</entry> + <entry>Another name for brightness (not a synonym of +<constant>V4L2_CID_BRIGHTNESS</constant>). This control is deprecated +and should not be used in new drivers and applications.</entry> + </row> + <row> + <entry><constant>V4L2_CID_AUTO_WHITE_BALANCE</constant></entry> + <entry>boolean</entry> + <entry>Automatic white balance (cameras).</entry> + </row> + <row> + <entry><constant>V4L2_CID_DO_WHITE_BALANCE</constant></entry> + <entry>button</entry> + <entry>This is an action control. When set (the value is +ignored), the device will do a white balance and then hold the current +setting. Contrast this with the boolean +<constant>V4L2_CID_AUTO_WHITE_BALANCE</constant>, which, when +activated, keeps adjusting the white balance.</entry> + </row> + <row> + <entry><constant>V4L2_CID_RED_BALANCE</constant></entry> + <entry>integer</entry> + <entry>Red chroma balance.</entry> + </row> + <row> + <entry><constant>V4L2_CID_BLUE_BALANCE</constant></entry> + <entry>integer</entry> + <entry>Blue chroma balance.</entry> + </row> + <row> + <entry><constant>V4L2_CID_GAMMA</constant></entry> + <entry>integer</entry> + <entry>Gamma adjust.</entry> + </row> + <row> + <entry><constant>V4L2_CID_WHITENESS</constant></entry> + <entry>integer</entry> + <entry>Whiteness for grey-scale devices. This is a synonym +for <constant>V4L2_CID_GAMMA</constant>. This control is deprecated +and should not be used in new drivers and applications.</entry> + </row> + <row> + <entry><constant>V4L2_CID_EXPOSURE</constant></entry> + <entry>integer</entry> + <entry>Exposure (cameras). [Unit?]</entry> + </row> + <row> + <entry><constant>V4L2_CID_AUTOGAIN</constant></entry> + <entry>boolean</entry> + <entry>Automatic gain/exposure control.</entry> + </row> + <row> + <entry><constant>V4L2_CID_GAIN</constant></entry> + <entry>integer</entry> + <entry>Gain control.</entry> + </row> + <row> + <entry><constant>V4L2_CID_HFLIP</constant></entry> + <entry>boolean</entry> + <entry>Mirror the picture horizontally.</entry> + </row> + <row> + <entry><constant>V4L2_CID_VFLIP</constant></entry> + <entry>boolean</entry> + <entry>Mirror the picture vertically.</entry> + </row> + <row id="v4l2-power-line-frequency"> + <entry><constant>V4L2_CID_POWER_LINE_FREQUENCY</constant></entry> + <entry>enum</entry> + <entry>Enables a power line frequency filter to avoid +flicker. Possible values for <constant>enum v4l2_power_line_frequency</constant> are: +<constant>V4L2_CID_POWER_LINE_FREQUENCY_DISABLED</constant> (0), +<constant>V4L2_CID_POWER_LINE_FREQUENCY_50HZ</constant> (1), +<constant>V4L2_CID_POWER_LINE_FREQUENCY_60HZ</constant> (2) and +<constant>V4L2_CID_POWER_LINE_FREQUENCY_AUTO</constant> (3).</entry> + </row> + <row> + <entry><constant>V4L2_CID_HUE_AUTO</constant></entry> + <entry>boolean</entry> + <entry>Enables automatic hue control by the device. The +effect of setting <constant>V4L2_CID_HUE</constant> while automatic +hue control is enabled is undefined, drivers should ignore such +request.</entry> + </row> + <row> + <entry><constant>V4L2_CID_WHITE_BALANCE_TEMPERATURE</constant></entry> + <entry>integer</entry> + <entry>This control specifies the white balance settings +as a color temperature in Kelvin. A driver should have a minimum of +2800 (incandescent) to 6500 (daylight). For more information about +color temperature see <ulink +url="http://en.wikipedia.org/wiki/Color_temperature">Wikipedia</ulink>.</entry> + </row> + <row> + <entry><constant>V4L2_CID_SHARPNESS</constant></entry> + <entry>integer</entry> + <entry>Adjusts the sharpness filters in a camera. The +minimum value disables the filters, higher values give a sharper +picture.</entry> + </row> + <row> + <entry><constant>V4L2_CID_BACKLIGHT_COMPENSATION</constant></entry> + <entry>integer</entry> + <entry>Adjusts the backlight compensation in a camera. The +minimum value disables backlight compensation.</entry> + </row> + <row> + <entry><constant>V4L2_CID_CHROMA_AGC</constant></entry> + <entry>boolean</entry> + <entry>Chroma automatic gain control.</entry> + </row> + <row> + <entry><constant>V4L2_CID_CHROMA_GAIN</constant></entry> + <entry>integer</entry> + <entry>Adjusts the Chroma gain control (for use when chroma AGC + is disabled).</entry> + </row> + <row> + <entry><constant>V4L2_CID_COLOR_KILLER</constant></entry> + <entry>boolean</entry> + <entry>Enable the color killer (&ie; force a black & white image in case of a weak video signal).</entry> + </row> + <row id="v4l2-colorfx"> + <entry><constant>V4L2_CID_COLORFX</constant></entry> + <entry>enum</entry> + <entry>Selects a color effect. The following values are defined: + </entry> + </row><row> + <entry></entry> + <entry></entry> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_COLORFX_NONE</constant> </entry> + <entry>Color effect is disabled.</entry> + </row> + <row> + <entry><constant>V4L2_COLORFX_ANTIQUE</constant> </entry> + <entry>An aging (old photo) effect.</entry> + </row> + <row> + <entry><constant>V4L2_COLORFX_ART_FREEZE</constant> </entry> + <entry>Frost color effect.</entry> + </row> + <row> + <entry><constant>V4L2_COLORFX_AQUA</constant> </entry> + <entry>Water color, cool tone.</entry> + </row> + <row> + <entry><constant>V4L2_COLORFX_BW</constant> </entry> + <entry>Black and white.</entry> + </row> + <row> + <entry><constant>V4L2_COLORFX_EMBOSS</constant> </entry> + <entry>Emboss, the highlights and shadows replace light/dark boundaries + and low contrast areas are set to a gray background.</entry> + </row> + <row> + <entry><constant>V4L2_COLORFX_GRASS_GREEN</constant> </entry> + <entry>Grass green.</entry> + </row> + <row> + <entry><constant>V4L2_COLORFX_NEGATIVE</constant> </entry> + <entry>Negative.</entry> + </row> + <row> + <entry><constant>V4L2_COLORFX_SEPIA</constant> </entry> + <entry>Sepia tone.</entry> + </row> + <row> + <entry><constant>V4L2_COLORFX_SKETCH</constant> </entry> + <entry>Sketch.</entry> + </row> + <row> + <entry><constant>V4L2_COLORFX_SKIN_WHITEN</constant> </entry> + <entry>Skin whiten.</entry> + </row> + <row> + <entry><constant>V4L2_COLORFX_SKY_BLUE</constant> </entry> + <entry>Sky blue.</entry> + </row> + <row> + <entry><constant>V4L2_COLORFX_SOLARIZATION</constant> </entry> + <entry>Solarization, the image is partially reversed in tone, + only color values above or below a certain threshold are inverted. + </entry> + </row> + <row> + <entry><constant>V4L2_COLORFX_SILHOUETTE</constant> </entry> + <entry>Silhouette (outline).</entry> + </row> + <row> + <entry><constant>V4L2_COLORFX_VIVID</constant> </entry> + <entry>Vivid colors.</entry> + </row> + <row> + <entry><constant>V4L2_COLORFX_SET_CBCR</constant> </entry> + <entry>The Cb and Cr chroma components are replaced by fixed + coefficients determined by <constant>V4L2_CID_COLORFX_CBCR</constant> + control.</entry> + </row> + </tbody> + </entrytbl> + </row> + <row> + <entry><constant>V4L2_CID_COLORFX_CBCR</constant></entry> + <entry>integer</entry> + <entry>Determines the Cb and Cr coefficients for <constant>V4L2_COLORFX_SET_CBCR</constant> + color effect. Bits [7:0] of the supplied 32 bit value are interpreted as + Cr component, bits [15:8] as Cb component and bits [31:16] must be zero. + </entry> + </row> + <row> + <entry><constant>V4L2_CID_AUTOBRIGHTNESS</constant></entry> + <entry>boolean</entry> + <entry>Enable Automatic Brightness.</entry> + </row> + <row> + <entry><constant>V4L2_CID_ROTATE</constant></entry> + <entry>integer</entry> + <entry>Rotates the image by specified angle. Common angles are 90, + 270 and 180. Rotating the image to 90 and 270 will reverse the height + and width of the display window. It is necessary to set the new height and + width of the picture using the &VIDIOC-S-FMT; ioctl according to + the rotation angle selected.</entry> + </row> + <row> + <entry><constant>V4L2_CID_BG_COLOR</constant></entry> + <entry>integer</entry> + <entry>Sets the background color on the current output device. + Background color needs to be specified in the RGB24 format. The + supplied 32 bit value is interpreted as bits 0-7 Red color information, + bits 8-15 Green color information, bits 16-23 Blue color + information and bits 24-31 must be zero.</entry> + </row> + <row> + <entry><constant>V4L2_CID_ILLUMINATORS_1</constant> + <constant>V4L2_CID_ILLUMINATORS_2</constant></entry> + <entry>boolean</entry> + <entry>Switch on or off the illuminator 1 or 2 of the device + (usually a microscope).</entry> + </row> + <row> + <entry><constant>V4L2_CID_MIN_BUFFERS_FOR_CAPTURE</constant></entry> + <entry>integer</entry> + <entry>This is a read-only control that can be read by the application +and used as a hint to determine the number of CAPTURE buffers to pass to REQBUFS. +The value is the minimum number of CAPTURE buffers that is necessary for hardware +to work.</entry> + </row> + <row> + <entry><constant>V4L2_CID_MIN_BUFFERS_FOR_OUTPUT</constant></entry> + <entry>integer</entry> + <entry>This is a read-only control that can be read by the application +and used as a hint to determine the number of OUTPUT buffers to pass to REQBUFS. +The value is the minimum number of OUTPUT buffers that is necessary for hardware +to work.</entry> + </row> + <row id="v4l2-alpha-component"> + <entry><constant>V4L2_CID_ALPHA_COMPONENT</constant></entry> + <entry>integer</entry> + <entry> Sets the alpha color component on the capture device or on + the capture buffer queue of a mem-to-mem device. When a mem-to-mem + device produces frame format that includes an alpha component + (e.g. <link linkend="rgb-formats">packed RGB image formats</link>) + and the alpha value is not defined by the mem-to-mem input data + this control lets you select the alpha component value of all + pixels. It is applicable to any pixel format that contains an alpha + component. + </entry> + </row> + <row> + <entry><constant>V4L2_CID_LASTP1</constant></entry> + <entry></entry> + <entry>End of the predefined control IDs (currently + <constant>V4L2_CID_ALPHA_COMPONENT</constant> + 1).</entry> + </row> + <row> + <entry><constant>V4L2_CID_PRIVATE_BASE</constant></entry> + <entry></entry> + <entry>ID of the first custom (driver specific) control. +Applications depending on particular custom controls should check the +driver name and version, see <xref linkend="querycap" />.</entry> + </row> + </tbody> + </tgroup> + </table> + + <para>Applications can enumerate the available controls with the +&VIDIOC-QUERYCTRL; and &VIDIOC-QUERYMENU; ioctls, get and set a +control value with the &VIDIOC-G-CTRL; and &VIDIOC-S-CTRL; ioctls. +Drivers must implement <constant>VIDIOC_QUERYCTRL</constant>, +<constant>VIDIOC_G_CTRL</constant> and +<constant>VIDIOC_S_CTRL</constant> when the device has one or more +controls, <constant>VIDIOC_QUERYMENU</constant> when it has one or +more menu type controls.</para> + + <example> + <title>Enumerating all controls</title> + + <programlisting> +&v4l2-queryctrl; queryctrl; +&v4l2-querymenu; querymenu; + +static void +enumerate_menu (void) +{ + printf (" Menu items:\n"); + + memset (&querymenu, 0, sizeof (querymenu)); + querymenu.id = queryctrl.id; + + for (querymenu.index = queryctrl.minimum; + querymenu.index <= queryctrl.maximum; + querymenu.index++) { + if (0 == ioctl (fd, &VIDIOC-QUERYMENU;, &querymenu)) { + printf (" %s\n", querymenu.name); + } + } +} + +memset (&queryctrl, 0, sizeof (queryctrl)); + +for (queryctrl.id = V4L2_CID_BASE; + queryctrl.id < V4L2_CID_LASTP1; + queryctrl.id++) { + if (0 == ioctl (fd, &VIDIOC-QUERYCTRL;, &queryctrl)) { + if (queryctrl.flags & V4L2_CTRL_FLAG_DISABLED) + continue; + + printf ("Control %s\n", queryctrl.name); + + if (queryctrl.type == V4L2_CTRL_TYPE_MENU) + enumerate_menu (); + } else { + if (errno == EINVAL) + continue; + + perror ("VIDIOC_QUERYCTRL"); + exit (EXIT_FAILURE); + } +} + +for (queryctrl.id = V4L2_CID_PRIVATE_BASE;; + queryctrl.id++) { + if (0 == ioctl (fd, &VIDIOC-QUERYCTRL;, &queryctrl)) { + if (queryctrl.flags & V4L2_CTRL_FLAG_DISABLED) + continue; + + printf ("Control %s\n", queryctrl.name); + + if (queryctrl.type == V4L2_CTRL_TYPE_MENU) + enumerate_menu (); + } else { + if (errno == EINVAL) + break; + + perror ("VIDIOC_QUERYCTRL"); + exit (EXIT_FAILURE); + } +} +</programlisting> + </example> + + <example> + <title>Changing controls</title> + + <programlisting> +&v4l2-queryctrl; queryctrl; +&v4l2-control; control; + +memset (&queryctrl, 0, sizeof (queryctrl)); +queryctrl.id = V4L2_CID_BRIGHTNESS; + +if (-1 == ioctl (fd, &VIDIOC-QUERYCTRL;, &queryctrl)) { + if (errno != EINVAL) { + perror ("VIDIOC_QUERYCTRL"); + exit (EXIT_FAILURE); + } else { + printf ("V4L2_CID_BRIGHTNESS is not supported\n"); + } +} else if (queryctrl.flags & V4L2_CTRL_FLAG_DISABLED) { + printf ("V4L2_CID_BRIGHTNESS is not supported\n"); +} else { + memset (&control, 0, sizeof (control)); + control.id = V4L2_CID_BRIGHTNESS; + control.value = queryctrl.default_value; + + if (-1 == ioctl (fd, &VIDIOC-S-CTRL;, &control)) { + perror ("VIDIOC_S_CTRL"); + exit (EXIT_FAILURE); + } +} + +memset (&control, 0, sizeof (control)); +control.id = V4L2_CID_CONTRAST; + +if (0 == ioctl (fd, &VIDIOC-G-CTRL;, &control)) { + control.value += 1; + + /* The driver may clamp the value or return ERANGE, ignored here */ + + if (-1 == ioctl (fd, &VIDIOC-S-CTRL;, &control) + && errno != ERANGE) { + perror ("VIDIOC_S_CTRL"); + exit (EXIT_FAILURE); + } +/* Ignore if V4L2_CID_CONTRAST is unsupported */ +} else if (errno != EINVAL) { + perror ("VIDIOC_G_CTRL"); + exit (EXIT_FAILURE); +} + +control.id = V4L2_CID_AUDIO_MUTE; +control.value = TRUE; /* silence */ + +/* Errors ignored */ +ioctl (fd, VIDIOC_S_CTRL, &control); +</programlisting> + </example> + </section> + + <section id="extended-controls"> + <title>Extended Controls</title> + + <section> + <title>Introduction</title> + + <para>The control mechanism as originally designed was meant +to be used for user settings (brightness, saturation, etc). However, +it turned out to be a very useful model for implementing more +complicated driver APIs where each driver implements only a subset of +a larger API.</para> + + <para>The MPEG encoding API was the driving force behind +designing and implementing this extended control mechanism: the MPEG +standard is quite large and the currently supported hardware MPEG +encoders each only implement a subset of this standard. Further more, +many parameters relating to how the video is encoded into an MPEG +stream are specific to the MPEG encoding chip since the MPEG standard +only defines the format of the resulting MPEG stream, not how the +video is actually encoded into that format.</para> + + <para>Unfortunately, the original control API lacked some +features needed for these new uses and so it was extended into the +(not terribly originally named) extended control API.</para> + + <para>Even though the MPEG encoding API was the first effort +to use the Extended Control API, nowadays there are also other classes +of Extended Controls, such as Camera Controls and FM Transmitter Controls. +The Extended Controls API as well as all Extended Controls classes are +described in the following text.</para> + </section> + + <section> + <title>The Extended Control API</title> + + <para>Three new ioctls are available: &VIDIOC-G-EXT-CTRLS;, +&VIDIOC-S-EXT-CTRLS; and &VIDIOC-TRY-EXT-CTRLS;. These ioctls act on +arrays of controls (as opposed to the &VIDIOC-G-CTRL; and +&VIDIOC-S-CTRL; ioctls that act on a single control). This is needed +since it is often required to atomically change several controls at +once.</para> + + <para>Each of the new ioctls expects a pointer to a +&v4l2-ext-controls;. This structure contains a pointer to the control +array, a count of the number of controls in that array and a control +class. Control classes are used to group similar controls into a +single class. For example, control class +<constant>V4L2_CTRL_CLASS_USER</constant> contains all user controls +(&ie; all controls that can also be set using the old +<constant>VIDIOC_S_CTRL</constant> ioctl). Control class +<constant>V4L2_CTRL_CLASS_MPEG</constant> contains all controls +relating to MPEG encoding, etc.</para> + + <para>All controls in the control array must belong to the +specified control class. An error is returned if this is not the +case.</para> + + <para>It is also possible to use an empty control array (count +== 0) to check whether the specified control class is +supported.</para> + + <para>The control array is a &v4l2-ext-control; array. The +<structname>v4l2_ext_control</structname> structure is very similar to +&v4l2-control;, except for the fact that it also allows for 64-bit +values and pointers to be passed.</para> + + <para>It is important to realize that due to the flexibility of +controls it is necessary to check whether the control you want to set +actually is supported in the driver and what the valid range of values +is. So use the &VIDIOC-QUERYCTRL; and &VIDIOC-QUERYMENU; ioctls to +check this. Also note that it is possible that some of the menu +indices in a control of type <constant>V4L2_CTRL_TYPE_MENU</constant> +may not be supported (<constant>VIDIOC_QUERYMENU</constant> will +return an error). A good example is the list of supported MPEG audio +bitrates. Some drivers only support one or two bitrates, others +support a wider range.</para> + + <para> + All controls use machine endianness. + </para> + </section> + + <section> + <title>Enumerating Extended Controls</title> + + <para>The recommended way to enumerate over the extended +controls is by using &VIDIOC-QUERYCTRL; in combination with the +<constant>V4L2_CTRL_FLAG_NEXT_CTRL</constant> flag:</para> + + <informalexample> + <programlisting> +&v4l2-queryctrl; qctrl; + +qctrl.id = V4L2_CTRL_FLAG_NEXT_CTRL; +while (0 == ioctl (fd, &VIDIOC-QUERYCTRL;, &qctrl)) { + /* ... */ + qctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL; +} +</programlisting> + </informalexample> + + <para>The initial control ID is set to 0 ORed with the +<constant>V4L2_CTRL_FLAG_NEXT_CTRL</constant> flag. The +<constant>VIDIOC_QUERYCTRL</constant> ioctl will return the first +control with a higher ID than the specified one. When no such controls +are found an error is returned.</para> + + <para>If you want to get all controls within a specific control +class, then you can set the initial +<structfield>qctrl.id</structfield> value to the control class and add +an extra check to break out of the loop when a control of another +control class is found:</para> + + <informalexample> + <programlisting> +qctrl.id = V4L2_CTRL_CLASS_MPEG | V4L2_CTRL_FLAG_NEXT_CTRL; +while (0 == ioctl (fd, &VIDIOC-QUERYCTRL;, &qctrl)) { + if (V4L2_CTRL_ID2CLASS (qctrl.id) != V4L2_CTRL_CLASS_MPEG) + break; + /* ... */ + qctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL; + } +</programlisting> + </informalexample> + + <para>The 32-bit <structfield>qctrl.id</structfield> value is +subdivided into three bit ranges: the top 4 bits are reserved for +flags (⪚ <constant>V4L2_CTRL_FLAG_NEXT_CTRL</constant>) and are not +actually part of the ID. The remaining 28 bits form the control ID, of +which the most significant 12 bits define the control class and the +least significant 16 bits identify the control within the control +class. It is guaranteed that these last 16 bits are always non-zero +for controls. The range of 0x1000 and up are reserved for +driver-specific controls. The macro +<constant>V4L2_CTRL_ID2CLASS(id)</constant> returns the control class +ID based on a control ID.</para> + + <para>If the driver does not support extended controls, then +<constant>VIDIOC_QUERYCTRL</constant> will fail when used in +combination with <constant>V4L2_CTRL_FLAG_NEXT_CTRL</constant>. In +that case the old method of enumerating control should be used (see +1.8). But if it is supported, then it is guaranteed to enumerate over +all controls, including driver-private controls.</para> + </section> + + <section> + <title>Creating Control Panels</title> + + <para>It is possible to create control panels for a graphical +user interface where the user can select the various controls. +Basically you will have to iterate over all controls using the method +described above. Each control class starts with a control of type +<constant>V4L2_CTRL_TYPE_CTRL_CLASS</constant>. +<constant>VIDIOC_QUERYCTRL</constant> will return the name of this +control class which can be used as the title of a tab page within a +control panel.</para> + + <para>The flags field of &v4l2-queryctrl; also contains hints on +the behavior of the control. See the &VIDIOC-QUERYCTRL; documentation +for more details.</para> + </section> + + <section id="mpeg-controls"> + <title>Codec Control Reference</title> + + <para>Below all controls within the Codec control class are +described. First the generic controls, then controls specific for +certain hardware.</para> + + <para>Note: These controls are applicable to all codecs and +not just MPEG. The defines are prefixed with V4L2_CID_MPEG/V4L2_MPEG +as the controls were originally made for MPEG codecs and later +extended to cover all encoding formats.</para> + + <section> + <title>Generic Codec Controls</title> + + <table pgwide="1" frame="none" id="mpeg-control-id"> + <title>Codec Control IDs</title> + <tgroup cols="4"> + <colspec colname="c1" colwidth="1*" /> + <colspec colname="c2" colwidth="6*" /> + <colspec colname="c3" colwidth="2*" /> + <colspec colname="c4" colwidth="6*" /> + <spanspec namest="c1" nameend="c2" spanname="id" /> + <spanspec namest="c2" nameend="c4" spanname="descr" /> + <thead> + <row> + <entry spanname="id" align="left">ID</entry> + <entry align="left">Type</entry> + </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry> + </row> + </thead> + <tbody valign="top"> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_CLASS</constant> </entry> + <entry>class</entry> + </row><row><entry spanname="descr">The Codec class +descriptor. Calling &VIDIOC-QUERYCTRL; for this control will return a +description of this control class. This description can be used as the +caption of a Tab page in a GUI, for example.</entry> + </row> + <row><entry></entry></row> + <row id="v4l2-mpeg-stream-type"> + <entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_TYPE</constant> </entry> + <entry>enum v4l2_mpeg_stream_type</entry> + </row><row><entry spanname="descr">The MPEG-1, -2 or -4 +output stream type. One cannot assume anything here. Each hardware +MPEG encoder tends to support different subsets of the available MPEG +stream types. This control is specific to multiplexed MPEG streams. +The currently defined stream types are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_MPEG_STREAM_TYPE_MPEG2_PS</constant> </entry> + <entry>MPEG-2 program stream</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_STREAM_TYPE_MPEG2_TS</constant> </entry> + <entry>MPEG-2 transport stream</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_STREAM_TYPE_MPEG1_SS</constant> </entry> + <entry>MPEG-1 system stream</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_STREAM_TYPE_MPEG2_DVD</constant> </entry> + <entry>MPEG-2 DVD-compatible stream</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_STREAM_TYPE_MPEG1_VCD</constant> </entry> + <entry>MPEG-1 VCD-compatible stream</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_STREAM_TYPE_MPEG2_SVCD</constant> </entry> + <entry>MPEG-2 SVCD-compatible stream</entry> + </row> + </tbody> + </entrytbl> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_PID_PMT</constant> </entry> + <entry>integer</entry> + </row><row><entry spanname="descr">Program Map Table +Packet ID for the MPEG transport stream (default 16)</entry> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_PID_AUDIO</constant> </entry> + <entry>integer</entry> + </row><row><entry spanname="descr">Audio Packet ID for +the MPEG transport stream (default 256)</entry> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_PID_VIDEO</constant> </entry> + <entry>integer</entry> + </row><row><entry spanname="descr">Video Packet ID for +the MPEG transport stream (default 260)</entry> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_PID_PCR</constant> </entry> + <entry>integer</entry> + </row><row><entry spanname="descr">Packet ID for the +MPEG transport stream carrying PCR fields (default 259)</entry> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_PES_ID_AUDIO</constant> </entry> + <entry>integer</entry> + </row><row><entry spanname="descr">Audio ID for MPEG +PES</entry> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_PES_ID_VIDEO</constant> </entry> + <entry>integer</entry> + </row><row><entry spanname="descr">Video ID for MPEG +PES</entry> + </row> + <row><entry></entry></row> + <row id="v4l2-mpeg-stream-vbi-fmt"> + <entry spanname="id"><constant>V4L2_CID_MPEG_STREAM_VBI_FMT</constant> </entry> + <entry>enum v4l2_mpeg_stream_vbi_fmt</entry> + </row><row><entry spanname="descr">Some cards can embed +VBI data (⪚ Closed Caption, Teletext) into the MPEG stream. This +control selects whether VBI data should be embedded, and if so, what +embedding method should be used. The list of possible VBI formats +depends on the driver. The currently defined VBI format types +are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_MPEG_STREAM_VBI_FMT_NONE</constant> </entry> + <entry>No VBI in the MPEG stream</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_STREAM_VBI_FMT_IVTV</constant> </entry> + <entry>VBI in private packets, IVTV format (documented +in the kernel sources in the file <filename>Documentation/video4linux/cx2341x/README.vbi</filename>)</entry> + </row> + </tbody> + </entrytbl> + </row> + <row><entry></entry></row> + <row id="v4l2-mpeg-audio-sampling-freq"> + <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ</constant> </entry> + <entry>enum v4l2_mpeg_audio_sampling_freq</entry> + </row><row><entry spanname="descr">MPEG Audio sampling +frequency. Possible values are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_MPEG_AUDIO_SAMPLING_FREQ_44100</constant> </entry> + <entry>44.1 kHz</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_SAMPLING_FREQ_48000</constant> </entry> + <entry>48 kHz</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_SAMPLING_FREQ_32000</constant> </entry> + <entry>32 kHz</entry> + </row> + </tbody> + </entrytbl> + </row> + <row><entry></entry></row> + <row id="v4l2-mpeg-audio-encoding"> + <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_ENCODING</constant> </entry> + <entry>enum v4l2_mpeg_audio_encoding</entry> + </row><row><entry spanname="descr">MPEG Audio encoding. +This control is specific to multiplexed MPEG streams. +Possible values are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_MPEG_AUDIO_ENCODING_LAYER_1</constant> </entry> + <entry>MPEG-1/2 Layer I encoding</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_ENCODING_LAYER_2</constant> </entry> + <entry>MPEG-1/2 Layer II encoding</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_ENCODING_LAYER_3</constant> </entry> + <entry>MPEG-1/2 Layer III encoding</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_ENCODING_AAC</constant> </entry> + <entry>MPEG-2/4 AAC (Advanced Audio Coding)</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_ENCODING_AC3</constant> </entry> + <entry>AC-3 aka ATSC A/52 encoding</entry> + </row> + </tbody> + </entrytbl> + </row> + <row><entry></entry></row> + <row id="v4l2-mpeg-audio-l1-bitrate"> + <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_L1_BITRATE</constant> </entry> + <entry>enum v4l2_mpeg_audio_l1_bitrate</entry> + </row><row><entry spanname="descr">MPEG-1/2 Layer I bitrate. +Possible values are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_32K</constant> </entry> + <entry>32 kbit/s</entry></row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_64K</constant> </entry> + <entry>64 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_96K</constant> </entry> + <entry>96 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_128K</constant> </entry> + <entry>128 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_160K</constant> </entry> + <entry>160 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_192K</constant> </entry> + <entry>192 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_224K</constant> </entry> + <entry>224 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_256K</constant> </entry> + <entry>256 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_288K</constant> </entry> + <entry>288 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_320K</constant> </entry> + <entry>320 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_352K</constant> </entry> + <entry>352 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_384K</constant> </entry> + <entry>384 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_416K</constant> </entry> + <entry>416 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L1_BITRATE_448K</constant> </entry> + <entry>448 kbit/s</entry> + </row> + </tbody> + </entrytbl> + </row> + <row><entry></entry></row> + <row id="v4l2-mpeg-audio-l2-bitrate"> + <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_L2_BITRATE</constant> </entry> + <entry>enum v4l2_mpeg_audio_l2_bitrate</entry> + </row><row><entry spanname="descr">MPEG-1/2 Layer II bitrate. +Possible values are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_32K</constant> </entry> + <entry>32 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_48K</constant> </entry> + <entry>48 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_56K</constant> </entry> + <entry>56 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_64K</constant> </entry> + <entry>64 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_80K</constant> </entry> + <entry>80 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_96K</constant> </entry> + <entry>96 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_112K</constant> </entry> + <entry>112 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_128K</constant> </entry> + <entry>128 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_160K</constant> </entry> + <entry>160 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_192K</constant> </entry> + <entry>192 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_224K</constant> </entry> + <entry>224 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_256K</constant> </entry> + <entry>256 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_320K</constant> </entry> + <entry>320 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L2_BITRATE_384K</constant> </entry> + <entry>384 kbit/s</entry> + </row> + </tbody> + </entrytbl> + </row> + <row><entry></entry></row> + <row id="v4l2-mpeg-audio-l3-bitrate"> + <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_L3_BITRATE</constant> </entry> + <entry>enum v4l2_mpeg_audio_l3_bitrate</entry> + </row><row><entry spanname="descr">MPEG-1/2 Layer III bitrate. +Possible values are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_32K</constant> </entry> + <entry>32 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_40K</constant> </entry> + <entry>40 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_48K</constant> </entry> + <entry>48 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_56K</constant> </entry> + <entry>56 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_64K</constant> </entry> + <entry>64 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_80K</constant> </entry> + <entry>80 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_96K</constant> </entry> + <entry>96 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_112K</constant> </entry> + <entry>112 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_128K</constant> </entry> + <entry>128 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_160K</constant> </entry> + <entry>160 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_192K</constant> </entry> + <entry>192 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_224K</constant> </entry> + <entry>224 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_256K</constant> </entry> + <entry>256 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_L3_BITRATE_320K</constant> </entry> + <entry>320 kbit/s</entry> + </row> + </tbody> + </entrytbl> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_AAC_BITRATE</constant> </entry> + <entry>integer</entry> + </row><row><entry spanname="descr">AAC bitrate in bits per second.</entry> + </row> + <row><entry></entry></row> + <row id="v4l2-mpeg-audio-ac3-bitrate"> + <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_AC3_BITRATE</constant> </entry> + <entry>enum v4l2_mpeg_audio_ac3_bitrate</entry> + </row><row><entry spanname="descr">AC-3 bitrate. +Possible values are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_32K</constant> </entry> + <entry>32 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_40K</constant> </entry> + <entry>40 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_48K</constant> </entry> + <entry>48 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_56K</constant> </entry> + <entry>56 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_64K</constant> </entry> + <entry>64 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_80K</constant> </entry> + <entry>80 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_96K</constant> </entry> + <entry>96 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_112K</constant> </entry> + <entry>112 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_128K</constant> </entry> + <entry>128 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_160K</constant> </entry> + <entry>160 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_192K</constant> </entry> + <entry>192 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_224K</constant> </entry> + <entry>224 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_256K</constant> </entry> + <entry>256 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_320K</constant> </entry> + <entry>320 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_384K</constant> </entry> + <entry>384 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_448K</constant> </entry> + <entry>448 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_512K</constant> </entry> + <entry>512 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_576K</constant> </entry> + <entry>576 kbit/s</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_AC3_BITRATE_640K</constant> </entry> + <entry>640 kbit/s</entry> + </row> + </tbody> + </entrytbl> + </row> + <row><entry></entry></row> + <row id="v4l2-mpeg-audio-mode"> + <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_MODE</constant> </entry> + <entry>enum v4l2_mpeg_audio_mode</entry> + </row><row><entry spanname="descr">MPEG Audio mode. +Possible values are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_MPEG_AUDIO_MODE_STEREO</constant> </entry> + <entry>Stereo</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_MODE_JOINT_STEREO</constant> </entry> + <entry>Joint Stereo</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_MODE_DUAL</constant> </entry> + <entry>Bilingual</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_MODE_MONO</constant> </entry> + <entry>Mono</entry> + </row> + </tbody> + </entrytbl> + </row> + <row><entry></entry></row> + <row id="v4l2-mpeg-audio-mode-extension"> + <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_MODE_EXTENSION</constant> </entry> + <entry>enum v4l2_mpeg_audio_mode_extension</entry> + </row><row><entry spanname="descr">Joint Stereo +audio mode extension. In Layer I and II they indicate which subbands +are in intensity stereo. All other subbands are coded in stereo. Layer +III is not (yet) supported. Possible values +are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_MPEG_AUDIO_MODE_EXTENSION_BOUND_4</constant> </entry> + <entry>Subbands 4-31 in intensity stereo</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_MODE_EXTENSION_BOUND_8</constant> </entry> + <entry>Subbands 8-31 in intensity stereo</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_MODE_EXTENSION_BOUND_12</constant> </entry> + <entry>Subbands 12-31 in intensity stereo</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_MODE_EXTENSION_BOUND_16</constant> </entry> + <entry>Subbands 16-31 in intensity stereo</entry> + </row> + </tbody> + </entrytbl> + </row> + <row><entry></entry></row> + <row id="v4l2-mpeg-audio-emphasis"> + <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_EMPHASIS</constant> </entry> + <entry>enum v4l2_mpeg_audio_emphasis</entry> + </row><row><entry spanname="descr">Audio Emphasis. +Possible values are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_MPEG_AUDIO_EMPHASIS_NONE</constant> </entry> + <entry>None</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_EMPHASIS_50_DIV_15_uS</constant> </entry> + <entry>50/15 microsecond emphasis</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_EMPHASIS_CCITT_J17</constant> </entry> + <entry>CCITT J.17</entry> + </row> + </tbody> + </entrytbl> + </row> + <row><entry></entry></row> + <row id="v4l2-mpeg-audio-crc"> + <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_CRC</constant> </entry> + <entry>enum v4l2_mpeg_audio_crc</entry> + </row><row><entry spanname="descr">CRC method. Possible +values are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_MPEG_AUDIO_CRC_NONE</constant> </entry> + <entry>None</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_CRC_CRC16</constant> </entry> + <entry>16 bit parity check</entry> + </row> + </tbody> + </entrytbl> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_MUTE</constant> </entry> + <entry>boolean</entry> + </row><row><entry spanname="descr">Mutes the audio when +capturing. This is not done by muting audio hardware, which can still +produce a slight hiss, but in the encoder itself, guaranteeing a fixed +and reproducible audio bitstream. 0 = unmuted, 1 = muted.</entry> + </row> + <row><entry></entry></row> + <row id="v4l2-mpeg-audio-dec-playback"> + <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK</constant> </entry> + <entry>enum v4l2_mpeg_audio_dec_playback</entry> + </row><row><entry spanname="descr">Determines how monolingual audio should be played back. +Possible values are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_AUTO</constant> </entry> + <entry>Automatically determines the best playback mode.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_STEREO</constant> </entry> + <entry>Stereo playback.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_LEFT</constant> </entry> + <entry>Left channel playback.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_RIGHT</constant> </entry> + <entry>Right channel playback.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_MONO</constant> </entry> + <entry>Mono playback.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_AUDIO_DEC_PLAYBACK_SWAPPED_STEREO</constant> </entry> + <entry>Stereo playback with swapped left and right channels.</entry> + </row> + </tbody> + </entrytbl> + </row> + <row><entry></entry></row> + <row id="v4l2-mpeg-audio-dec-multilingual-playback"> + <entry spanname="id"><constant>V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK</constant> </entry> + <entry>enum v4l2_mpeg_audio_dec_playback</entry> + </row><row><entry spanname="descr">Determines how multilingual audio should be played back.</entry> + </row> + <row><entry></entry></row> + <row id="v4l2-mpeg-video-encoding"> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_ENCODING</constant> </entry> + <entry>enum v4l2_mpeg_video_encoding</entry> + </row><row><entry spanname="descr">MPEG Video encoding +method. This control is specific to multiplexed MPEG streams. +Possible values are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_MPEG_VIDEO_ENCODING_MPEG_1</constant> </entry> + <entry>MPEG-1 Video encoding</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_ENCODING_MPEG_2</constant> </entry> + <entry>MPEG-2 Video encoding</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_ENCODING_MPEG_4_AVC</constant> </entry> + <entry>MPEG-4 AVC (H.264) Video encoding</entry> + </row> + </tbody> + </entrytbl> + </row> + <row><entry></entry></row> + <row id="v4l2-mpeg-video-aspect"> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_ASPECT</constant> </entry> + <entry>enum v4l2_mpeg_video_aspect</entry> + </row><row><entry spanname="descr">Video aspect. +Possible values are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_MPEG_VIDEO_ASPECT_1x1</constant> </entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_ASPECT_4x3</constant> </entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_ASPECT_16x9</constant> </entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_ASPECT_221x100</constant> </entry> + </row> + </tbody> + </entrytbl> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_B_FRAMES</constant> </entry> + <entry>integer</entry> + </row><row><entry spanname="descr">Number of B-Frames +(default 2)</entry> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_GOP_SIZE</constant> </entry> + <entry>integer</entry> + </row><row><entry spanname="descr">GOP size (default +12)</entry> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_GOP_CLOSURE</constant> </entry> + <entry>boolean</entry> + </row><row><entry spanname="descr">GOP closure (default +1)</entry> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_PULLDOWN</constant> </entry> + <entry>boolean</entry> + </row><row><entry spanname="descr">Enable 3:2 pulldown +(default 0)</entry> + </row> + <row><entry></entry></row> + <row id="v4l2-mpeg-video-bitrate-mode"> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_BITRATE_MODE</constant> </entry> + <entry>enum v4l2_mpeg_video_bitrate_mode</entry> + </row><row><entry spanname="descr">Video bitrate mode. +Possible values are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_MPEG_VIDEO_BITRATE_MODE_VBR</constant> </entry> + <entry>Variable bitrate</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_BITRATE_MODE_CBR</constant> </entry> + <entry>Constant bitrate</entry> + </row> + </tbody> + </entrytbl> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_BITRATE</constant> </entry> + <entry>integer</entry> + </row><row><entry spanname="descr">Video bitrate in bits +per second.</entry> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_BITRATE_PEAK</constant> </entry> + <entry>integer</entry> + </row><row><entry spanname="descr">Peak video bitrate in +bits per second. Must be larger or equal to the average video bitrate. +It is ignored if the video bitrate mode is set to constant +bitrate.</entry> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION</constant> </entry> + <entry>integer</entry> + </row><row><entry spanname="descr">For every captured +frame, skip this many subsequent frames (default 0).</entry> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MUTE</constant> </entry> + <entry>boolean</entry> + </row> + <row><entry spanname="descr">"Mutes" the video to a +fixed color when capturing. This is useful for testing, to produce a +fixed video bitstream. 0 = unmuted, 1 = muted.</entry> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MUTE_YUV</constant> </entry> + <entry>integer</entry> + </row><row><entry spanname="descr">Sets the "mute" color +of the video. The supplied 32-bit integer is interpreted as follows (bit +0 = least significant bit):</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry>Bit 0:7</entry> + <entry>V chrominance information</entry> + </row> + <row> + <entry>Bit 8:15</entry> + <entry>U chrominance information</entry> + </row> + <row> + <entry>Bit 16:23</entry> + <entry>Y luminance information</entry> + </row> + <row> + <entry>Bit 24:31</entry> + <entry>Must be zero.</entry> + </row> + </tbody> + </entrytbl> + </row> + <row><entry></entry></row> + <row id="v4l2-mpeg-video-dec-pts"> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_DEC_PTS</constant> </entry> + <entry>integer64</entry> + </row><row><entry spanname="descr">This read-only control returns the +33-bit video Presentation Time Stamp as defined in ITU T-REC-H.222.0 and ISO/IEC 13818-1 of +the currently displayed frame. This is the same PTS as is used in &VIDIOC-DECODER-CMD;.</entry> + </row> + <row><entry></entry></row> + <row id="v4l2-mpeg-video-dec-frame"> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_DEC_FRAME</constant> </entry> + <entry>integer64</entry> + </row><row><entry spanname="descr">This read-only control returns the +frame counter of the frame that is currently displayed (decoded). This value is reset to 0 whenever +the decoder is started.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE</constant> </entry> + <entry>boolean</entry> + </row> + <row><entry spanname="descr">If enabled the decoder expects to receive a single slice per buffer, otherwise +the decoder expects a single frame in per buffer. Applicable to the decoder, all codecs. +</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE</constant> </entry> + <entry>boolean</entry> + </row> + <row><entry spanname="descr">Enable writing sample aspect ratio in the Video Usability Information. +Applicable to the H264 encoder.</entry> + </row> + + <row><entry></entry></row> + <row id="v4l2-mpeg-video-h264-vui-sar-idc"> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC</constant> </entry> + <entry>enum v4l2_mpeg_video_h264_vui_sar_idc</entry> + </row> + <row><entry spanname="descr">VUI sample aspect ratio indicator for H.264 encoding. The value +is defined in the table E-1 in the standard. Applicable to the H264 encoder.</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_UNSPECIFIED</constant> </entry> + <entry>Unspecified</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_1x1</constant> </entry> + <entry>1x1</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_12x11</constant> </entry> + <entry>12x11</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_10x11</constant> </entry> + <entry>10x11</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_16x11</constant> </entry> + <entry>16x11</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_40x33</constant> </entry> + <entry>40x33</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_24x11</constant> </entry> + <entry>24x11</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_20x11</constant> </entry> + <entry>20x11</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_32x11</constant> </entry> + <entry>32x11</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_80x33</constant> </entry> + <entry>80x33</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_18x11</constant> </entry> + <entry>18x11</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_15x11</constant> </entry> + <entry>15x11</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_64x33</constant> </entry> + <entry>64x33</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_160x99</constant> </entry> + <entry>160x99</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_4x3</constant> </entry> + <entry>4x3</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_3x2</constant> </entry> + <entry>3x2</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_2x1</constant> </entry> + <entry>2x1</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_EXTENDED</constant> </entry> + <entry>Extended SAR</entry> + </row> + </tbody> + </entrytbl> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Extended sample aspect ratio width for H.264 VUI encoding. +Applicable to the H264 encoder.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Extended sample aspect ratio height for H.264 VUI encoding. +Applicable to the H264 encoder.</entry> + </row> + + <row><entry></entry></row> + <row id="v4l2-mpeg-video-h264-level"> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_LEVEL</constant> </entry> + <entry>enum v4l2_mpeg_video_h264_level</entry> + </row> + <row><entry spanname="descr">The level information for the H264 video elementary stream. +Applicable to the H264 encoder. +Possible values are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_1_0</constant> </entry> + <entry>Level 1.0</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_1B</constant> </entry> + <entry>Level 1B</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_1_1</constant> </entry> + <entry>Level 1.1</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_1_2</constant> </entry> + <entry>Level 1.2</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_1_3</constant> </entry> + <entry>Level 1.3</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_2_0</constant> </entry> + <entry>Level 2.0</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_2_1</constant> </entry> + <entry>Level 2.1</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_2_2</constant> </entry> + <entry>Level 2.2</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_3_0</constant> </entry> + <entry>Level 3.0</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_3_1</constant> </entry> + <entry>Level 3.1</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_3_2</constant> </entry> + <entry>Level 3.2</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_4_0</constant> </entry> + <entry>Level 4.0</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_4_1</constant> </entry> + <entry>Level 4.1</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_4_2</constant> </entry> + <entry>Level 4.2</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_5_0</constant> </entry> + <entry>Level 5.0</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_LEVEL_5_1</constant> </entry> + <entry>Level 5.1</entry> + </row> + </tbody> + </entrytbl> + </row> + + <row><entry></entry></row> + <row id="v4l2-mpeg-video-mpeg4-level"> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL</constant> </entry> + <entry>enum v4l2_mpeg_video_mpeg4_level</entry> + </row> + <row><entry spanname="descr">The level information for the MPEG4 elementary stream. +Applicable to the MPEG4 encoder. +Possible values are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_MPEG_VIDEO_LEVEL_0</constant> </entry> + <entry>Level 0</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_LEVEL_0B</constant> </entry> + <entry>Level 0b</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_LEVEL_1</constant> </entry> + <entry>Level 1</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_LEVEL_2</constant> </entry> + <entry>Level 2</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_LEVEL_3</constant> </entry> + <entry>Level 3</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_LEVEL_3B</constant> </entry> + <entry>Level 3b</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_LEVEL_4</constant> </entry> + <entry>Level 4</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_LEVEL_5</constant> </entry> + <entry>Level 5</entry> + </row> + </tbody> + </entrytbl> + </row> + + <row><entry></entry></row> + <row id="v4l2-mpeg-video-h264-profile"> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_PROFILE</constant> </entry> + <entry>enum v4l2_mpeg_video_h264_profile</entry> + </row> + <row><entry spanname="descr">The profile information for H264. +Applicable to the H264 encoder. +Possible values are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_BASELINE</constant> </entry> + <entry>Baseline profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_CONSTRAINED_BASELINE</constant> </entry> + <entry>Constrained Baseline profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_MAIN</constant> </entry> + <entry>Main profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_EXTENDED</constant> </entry> + <entry>Extended profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH</constant> </entry> + <entry>High profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_10</constant> </entry> + <entry>High 10 profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_422</constant> </entry> + <entry>High 422 profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_444_PREDICTIVE</constant> </entry> + <entry>High 444 Predictive profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_10_INTRA</constant> </entry> + <entry>High 10 Intra profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_422_INTRA</constant> </entry> + <entry>High 422 Intra profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_444_INTRA</constant> </entry> + <entry>High 444 Intra profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_CAVLC_444_INTRA</constant> </entry> + <entry>CAVLC 444 Intra profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_SCALABLE_BASELINE</constant> </entry> + <entry>Scalable Baseline profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_SCALABLE_HIGH</constant> </entry> + <entry>Scalable High profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_SCALABLE_HIGH_INTRA</constant> </entry> + <entry>Scalable High Intra profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_STEREO_HIGH</constant> </entry> + <entry>Stereo High profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_PROFILE_MULTIVIEW_HIGH</constant> </entry> + <entry>Multiview High profile</entry> + </row> + + </tbody> + </entrytbl> + </row> + + <row><entry></entry></row> + <row id="v4l2-mpeg-video-mpeg4-profile"> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE</constant> </entry> + <entry>enum v4l2_mpeg_video_mpeg4_profile</entry> + </row> + <row><entry spanname="descr">The profile information for MPEG4. +Applicable to the MPEG4 encoder. +Possible values are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_MPEG_VIDEO_PROFILE_SIMPLE</constant> </entry> + <entry>Simple profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_PROFILE_ADVANCED_SIMPLE</constant> </entry> + <entry>Advanced Simple profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_PROFILE_CORE</constant> </entry> + <entry>Core profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_PROFILE_SIMPLE_SCALABLE</constant> </entry> + <entry>Simple Scalable profile</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_PROFILE_ADVANCED_CODING_EFFICIENCY</constant> </entry> + <entry></entry> + </row> + </tbody> + </entrytbl> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MAX_REF_PIC</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">The maximum number of reference pictures used for encoding. +Applicable to the encoder. +</entry> + </row> + + <row><entry></entry></row> + <row id="v4l2-mpeg-video-multi-slice-mode"> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE</constant> </entry> + <entry>enum v4l2_mpeg_video_multi_slice_mode</entry> + </row> + <row><entry spanname="descr">Determines how the encoder should handle division of frame into slices. +Applicable to the encoder. +Possible values are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_SINGLE</constant> </entry> + <entry>Single slice per frame.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_MB</constant> </entry> + <entry>Multiple slices with set maximum number of macroblocks per slice.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_BYTES</constant> </entry> + <entry>Multiple slice with set maximum size in bytes per slice.</entry> + </row> + </tbody> + </entrytbl> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">The maximum number of macroblocks in a slice. Used when +<constant>V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE</constant> is set to <constant>V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_MB</constant>. +Applicable to the encoder.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">The maximum size of a slice in bytes. Used when +<constant>V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE</constant> is set to <constant>V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_BYTES</constant>. +Applicable to the encoder.</entry> + </row> + + <row><entry></entry></row> + <row id="v4l2-mpeg-video-h264-loop-filter-mode"> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE</constant> </entry> + <entry>enum v4l2_mpeg_video_h264_loop_filter_mode</entry> + </row> + <row><entry spanname="descr">Loop filter mode for H264 encoder. +Possible values are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_LOOP_FILTER_MODE_ENABLED</constant> </entry> + <entry>Loop filter is enabled.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_LOOP_FILTER_MODE_DISABLED</constant> </entry> + <entry>Loop filter is disabled.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_LOOP_FILTER_MODE_DISABLED_AT_SLICE_BOUNDARY</constant> </entry> + <entry>Loop filter is disabled at the slice boundary.</entry> + </row> + </tbody> + </entrytbl> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Loop filter alpha coefficient, defined in the H264 standard. +Applicable to the H264 encoder.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Loop filter beta coefficient, defined in the H264 standard. +Applicable to the H264 encoder.</entry> + </row> + + <row><entry></entry></row> + <row id="v4l2-mpeg-video-h264-entropy-mode"> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE</constant> </entry> + <entry>enum v4l2_mpeg_video_h264_entropy_mode</entry> + </row> + <row><entry spanname="descr">Entropy coding mode for H264 - CABAC/CAVALC. +Applicable to the H264 encoder. +Possible values are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_ENTROPY_MODE_CAVLC</constant> </entry> + <entry>Use CAVLC entropy coding.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_ENTROPY_MODE_CABAC</constant> </entry> + <entry>Use CABAC entropy coding.</entry> + </row> + </tbody> + </entrytbl> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM</constant> </entry> + <entry>boolean</entry> + </row> + <row><entry spanname="descr">Enable 8X8 transform for H264. Applicable to the H264 encoder.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Cyclic intra macroblock refresh. This is the number of continuous macroblocks +refreshed every frame. Each frame a successive set of macroblocks is refreshed until the cycle completes and starts from the +top of the frame. Applicable to H264, H263 and MPEG4 encoder.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE</constant> </entry> + <entry>boolean</entry> + </row> + <row><entry spanname="descr">Frame level rate control enable. +If this control is disabled then the quantization parameter for each frame type is constant and set with appropriate controls +(e.g. <constant>V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP</constant>). +If frame rate control is enabled then quantization parameter is adjusted to meet the chosen bitrate. Minimum and maximum value +for the quantization parameter can be set with appropriate controls (e.g. <constant>V4L2_CID_MPEG_VIDEO_H263_MIN_QP</constant>). +Applicable to encoders.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE</constant> </entry> + <entry>boolean</entry> + </row> + <row><entry spanname="descr">Macroblock level rate control enable. +Applicable to the MPEG4 and H264 encoders.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_QPEL</constant> </entry> + <entry>boolean</entry> + </row> + <row><entry spanname="descr">Quarter pixel motion estimation for MPEG4. Applicable to the MPEG4 encoder.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Quantization parameter for an I frame for H263. Valid range: from 1 to 31.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H263_MIN_QP</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Minimum quantization parameter for H263. Valid range: from 1 to 31.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H263_MAX_QP</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Maximum quantization parameter for H263. Valid range: from 1 to 31.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Quantization parameter for an P frame for H263. Valid range: from 1 to 31.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Quantization parameter for an B frame for H263. Valid range: from 1 to 31.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Quantization parameter for an I frame for H264. Valid range: from 0 to 51.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_MIN_QP</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Minimum quantization parameter for H264. Valid range: from 0 to 51.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_MAX_QP</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Maximum quantization parameter for H264. Valid range: from 0 to 51.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Quantization parameter for an P frame for H264. Valid range: from 0 to 51.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Quantization parameter for an B frame for H264. Valid range: from 0 to 51.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Quantization parameter for an I frame for MPEG4. Valid range: from 1 to 31.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Minimum quantization parameter for MPEG4. Valid range: from 1 to 31.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Maximum quantization parameter for MPEG4. Valid range: from 1 to 31.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Quantization parameter for an P frame for MPEG4. Valid range: from 1 to 31.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Quantization parameter for an B frame for MPEG4. Valid range: from 1 to 31.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VBV_SIZE</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">The Video Buffer Verifier size in kilobytes, it is used as a limitation of frame skip. +The VBV is defined in the standard as a mean to verify that the produced stream will be successfully decoded. +The standard describes it as "Part of a hypothetical decoder that is conceptually connected to the +output of the encoder. Its purpose is to provide a constraint on the variability of the data rate that an +encoder or editing process may produce.". +Applicable to the MPEG1, MPEG2, MPEG4 encoders.</entry> + </row> + + <row><entry></entry></row> + <row id="v4l2-mpeg-video-vbv-delay"> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VBV_DELAY</constant> </entry> + <entry>integer</entry> + </row><row><entry spanname="descr">Sets the initial delay in milliseconds for +VBV buffer control.</entry> + </row> + + <row><entry></entry></row> + <row id="v4l2-mpeg-video-hor-search-range"> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Horizontal search range defines maximum horizontal search area in pixels +to search and match for the present Macroblock (MB) in the reference picture. This V4L2 control macro is used to set +horizontal search range for motion estimation module in video encoder.</entry> + </row> + + <row><entry></entry></row> + <row id="v4l2-mpeg-video-vert-search-range"> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Vertical search range defines maximum vertical search area in pixels +to search and match for the present Macroblock (MB) in the reference picture. This V4L2 control macro is used to set +vertical search range for motion estimation module in video encoder.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">The Coded Picture Buffer size in kilobytes, it is used as a limitation of frame skip. +The CPB is defined in the H264 standard as a mean to verify that the produced stream will be successfully decoded. +Applicable to the H264 encoder.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_I_PERIOD</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Period between I-frames in the open GOP for H264. In case of an open GOP +this is the period between two I-frames. The period between IDR (Instantaneous Decoding Refresh) frames is taken from the GOP_SIZE control. +An IDR frame, which stands for Instantaneous Decoding Refresh is an I-frame after which no prior frames are +referenced. This means that a stream can be restarted from an IDR frame without the need to store or decode any +previous frames. Applicable to the H264 encoder.</entry> + </row> + + <row><entry></entry></row> + <row id="v4l2-mpeg-video-header-mode"> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_HEADER_MODE</constant> </entry> + <entry>enum v4l2_mpeg_video_header_mode</entry> + </row> + <row><entry spanname="descr">Determines whether the header is returned as the first buffer or is +it returned together with the first frame. Applicable to encoders. +Possible values are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_MPEG_VIDEO_HEADER_MODE_SEPARATE</constant> </entry> + <entry>The stream header is returned separately in the first buffer.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_HEADER_MODE_JOINED_WITH_1ST_FRAME</constant> </entry> + <entry>The stream header is returned together with the first encoded frame.</entry> + </row> + </tbody> + </entrytbl> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER</constant> </entry> + <entry>boolean</entry> + </row><row><entry spanname="descr">Repeat the video sequence headers. Repeating these +headers makes random access to the video stream easier. Applicable to the MPEG1, 2 and 4 encoder.</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER</constant> </entry> + <entry>boolean</entry> + </row><row><entry spanname="descr">Enabled the deblocking post processing filter for MPEG4 decoder. +Applicable to the MPEG4 decoder.</entry> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_VOP_TIME_RES</constant> </entry> + <entry>integer</entry> + </row><row><entry spanname="descr">vop_time_increment_resolution value for MPEG4. Applicable to the MPEG4 encoder.</entry> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_MPEG4_VOP_TIME_INC</constant> </entry> + <entry>integer</entry> + </row><row><entry spanname="descr">vop_time_increment value for MPEG4. Applicable to the MPEG4 encoder.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_SEI_FRAME_PACKING</constant> </entry> + <entry>boolean</entry> + </row> + <row><entry spanname="descr">Enable generation of frame packing supplemental enhancement information in the encoded bitstream. +The frame packing SEI message contains the arrangement of L and R planes for 3D viewing. Applicable to the H264 encoder.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_SEI_FP_CURRENT_FRAME_0</constant> </entry> + <entry>boolean</entry> + </row> + <row><entry spanname="descr">Sets current frame as frame0 in frame packing SEI. +Applicable to the H264 encoder.</entry> + </row> + + <row><entry></entry></row> + <row id="v4l2-mpeg-video-h264-sei-fp-arrangement-type"> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE</constant> </entry> + <entry>enum v4l2_mpeg_video_h264_sei_fp_arrangement_type</entry> + </row> + <row><entry spanname="descr">Frame packing arrangement type for H264 SEI. +Applicable to the H264 encoder. +Possible values are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_CHEKERBOARD</constant> </entry> + <entry>Pixels are alternatively from L and R.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_COLUMN</constant> </entry> + <entry>L and R are interlaced by column.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_ROW</constant> </entry> + <entry>L and R are interlaced by row.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_SIDE_BY_SIDE</constant> </entry> + <entry>L is on the left, R on the right.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_TOP_BOTTOM</constant> </entry> + <entry>L is on top, R on bottom.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_TEMPORAL</constant> </entry> + <entry>One view per frame.</entry> + </row> + </tbody> + </entrytbl> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_FMO</constant> </entry> + <entry>boolean</entry> + </row> + <row><entry spanname="descr">Enables flexible macroblock ordering in the encoded bitstream. It is a technique +used for restructuring the ordering of macroblocks in pictures. Applicable to the H264 encoder.</entry> + </row> + + <row><entry></entry></row> + <row id="v4l2-mpeg-video-h264-fmo-map-type"> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE</constant> </entry> + <entry>enum v4l2_mpeg_video_h264_fmo_map_type</entry> + </row> + <row><entry spanname="descr">When using FMO, the map type divides the image in different scan patterns of macroblocks. +Applicable to the H264 encoder. +Possible values are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_INTERLEAVED_SLICES</constant> </entry> + <entry>Slices are interleaved one after other with macroblocks in run length order.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_SCATTERED_SLICES</constant> </entry> + <entry>Scatters the macroblocks based on a mathematical function known to both encoder and decoder.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_FOREGROUND_WITH_LEFT_OVER</constant> </entry> + <entry>Macroblocks arranged in rectangular areas or regions of interest.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_BOX_OUT</constant> </entry> + <entry>Slice groups grow in a cyclic way from centre to outwards.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_RASTER_SCAN</constant> </entry> + <entry>Slice groups grow in raster scan pattern from left to right.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_WIPE_SCAN</constant> </entry> + <entry>Slice groups grow in wipe scan pattern from top to bottom.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_EXPLICIT</constant> </entry> + <entry>User defined map type.</entry> + </row> + </tbody> + </entrytbl> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_FMO_SLICE_GROUP</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Number of slice groups in FMO. +Applicable to the H264 encoder.</entry> + </row> + + <row><entry></entry></row> + <row id="v4l2-mpeg-video-h264-fmo-change-direction"> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_DIRECTION</constant> </entry> + <entry>enum v4l2_mpeg_video_h264_fmo_change_dir</entry> + </row> + <row><entry spanname="descr">Specifies a direction of the slice group change for raster and wipe maps. +Applicable to the H264 encoder. +Possible values are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_CHANGE_DIR_RIGHT</constant> </entry> + <entry>Raster scan or wipe right.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_FMO_CHANGE_DIR_LEFT</constant> </entry> + <entry>Reverse raster scan or wipe left.</entry> + </row> + </tbody> + </entrytbl> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_RATE</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Specifies the size of the first slice group for raster and wipe map. +Applicable to the H264 encoder.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_FMO_RUN_LENGTH</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Specifies the number of consecutive macroblocks for the interleaved map. +Applicable to the H264 encoder.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_ASO</constant> </entry> + <entry>boolean</entry> + </row> + <row><entry spanname="descr">Enables arbitrary slice ordering in encoded bitstream. +Applicable to the H264 encoder.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_ASO_SLICE_ORDER</constant> </entry> + <entry>integer</entry> + </row><row><entry spanname="descr">Specifies the slice order in ASO. Applicable to the H264 encoder. +The supplied 32-bit integer is interpreted as follows (bit +0 = least significant bit):</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry>Bit 0:15</entry> + <entry>Slice ID</entry> + </row> + <row> + <entry>Bit 16:32</entry> + <entry>Slice position or order</entry> + </row> + </tbody> + </entrytbl> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING</constant> </entry> + <entry>boolean</entry> + </row> + <row><entry spanname="descr">Enables H264 hierarchical coding. +Applicable to the H264 encoder.</entry> + </row> + + <row><entry></entry></row> + <row id="v4l2-mpeg-video-h264-hierarchical-coding-type"> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_TYPE</constant> </entry> + <entry>enum v4l2_mpeg_video_h264_hierarchical_coding_type</entry> + </row> + <row><entry spanname="descr">Specifies the hierarchical coding type. +Applicable to the H264 encoder. +Possible values are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_HIERARCHICAL_CODING_B</constant> </entry> + <entry>Hierarchical B coding.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VIDEO_H264_HIERARCHICAL_CODING_P</constant> </entry> + <entry>Hierarchical P coding.</entry> + </row> + </tbody> + </entrytbl> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Specifies the number of hierarchical coding layers. +Applicable to the H264 encoder.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP</constant> </entry> + <entry>integer</entry> + </row><row><entry spanname="descr">Specifies a user defined QP for each layer. Applicable to the H264 encoder. +The supplied 32-bit integer is interpreted as follows (bit +0 = least significant bit):</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry>Bit 0:15</entry> + <entry>QP value</entry> + </row> + <row> + <entry>Bit 16:32</entry> + <entry>Layer number</entry> + </row> + </tbody> + </entrytbl> + </row> + + </tbody> + </tgroup> + </table> + </section> + + <section> + <title>MFC 5.1 MPEG Controls</title> + + <para>The following MPEG class controls deal with MPEG +decoding and encoding settings that are specific to the Multi Format Codec 5.1 device present +in the S5P family of SoCs by Samsung. +</para> + + <table pgwide="1" frame="none" id="mfc51-control-id"> + <title>MFC 5.1 Control IDs</title> + <tgroup cols="4"> + <colspec colname="c1" colwidth="1*" /> + <colspec colname="c2" colwidth="6*" /> + <colspec colname="c3" colwidth="2*" /> + <colspec colname="c4" colwidth="6*" /> + <spanspec namest="c1" nameend="c2" spanname="id" /> + <spanspec namest="c2" nameend="c4" spanname="descr" /> + <thead> + <row> + <entry spanname="id" align="left">ID</entry> + <entry align="left">Type</entry> + </row><row><entry spanname="descr" align="left">Description</entry> + </row> + </thead> + <tbody valign="top"> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_DECODER_H264_DISPLAY_DELAY_ENABLE</constant> </entry> + <entry>integer</entry> + </row><row><entry spanname="descr">If the display delay is enabled then the decoder has to return a +CAPTURE buffer after processing a certain number of OUTPUT buffers. If this number is low, then it may result in +buffers not being dequeued in display order. In addition hardware may still use those buffers as reference, thus +application should not write to those buffers. This feature can be used for example for generating thumbnails of videos. +Applicable to the H264 decoder. + </entry> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_DECODER_H264_DISPLAY_DELAY</constant> </entry> + <entry>integer</entry> + </row><row><entry spanname="descr">Display delay value for H264 decoder. +The decoder is forced to return a decoded frame after the set 'display delay' number of frames. If this number is +low it may result in frames returned out of dispaly order, in addition the hardware may still be using the returned buffer +as a reference picture for subsequent frames. +</entry> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_H264_NUM_REF_PIC_FOR_P</constant> </entry> + <entry>integer</entry> + </row><row><entry spanname="descr">The number of reference pictures used for encoding a P picture. +Applicable to the H264 encoder.</entry> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_PADDING</constant> </entry> + <entry>boolean</entry> + </row><row><entry spanname="descr">Padding enable in the encoder - use a color instead of repeating border pixels. +Applicable to encoders.</entry> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_PADDING_YUV</constant> </entry> + <entry>integer</entry> + </row><row><entry spanname="descr">Padding color in the encoder. Applicable to encoders. The supplied 32-bit integer is interpreted as follows (bit +0 = least significant bit):</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry>Bit 0:7</entry> + <entry>V chrominance information</entry> + </row> + <row> + <entry>Bit 8:15</entry> + <entry>U chrominance information</entry> + </row> + <row> + <entry>Bit 16:23</entry> + <entry>Y luminance information</entry> + </row> + <row> + <entry>Bit 24:31</entry> + <entry>Must be zero.</entry> + </row> + </tbody> + </entrytbl> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_RC_REACTION_COEFF</constant> </entry> + <entry>integer</entry> + </row><row><entry spanname="descr">Reaction coefficient for MFC rate control. Applicable to encoders. +<para>Note 1: Valid only when the frame level RC is enabled.</para> +<para>Note 2: For tight CBR, this field must be small (ex. 2 ~ 10). +For VBR, this field must be large (ex. 100 ~ 1000).</para> +<para>Note 3: It is not recommended to use the greater number than FRAME_RATE * (10^9 / BIT_RATE).</para> +</entry> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_H264_ADAPTIVE_RC_DARK</constant> </entry> + <entry>boolean</entry> + </row><row><entry spanname="descr">Adaptive rate control for dark region. +Valid only when H.264 and macroblock level RC is enabled (<constant>V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE</constant>). +Applicable to the H264 encoder.</entry> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_H264_ADAPTIVE_RC_SMOOTH</constant> </entry> + <entry>boolean</entry> + </row><row><entry spanname="descr">Adaptive rate control for smooth region. +Valid only when H.264 and macroblock level RC is enabled (<constant>V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE</constant>). +Applicable to the H264 encoder.</entry> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_H264_ADAPTIVE_RC_STATIC</constant> </entry> + <entry>boolean</entry> + </row><row><entry spanname="descr">Adaptive rate control for static region. +Valid only when H.264 and macroblock level RC is enabled (<constant>V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE</constant>). +Applicable to the H264 encoder.</entry> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_H264_ADAPTIVE_RC_ACTIVITY</constant> </entry> + <entry>boolean</entry> + </row><row><entry spanname="descr">Adaptive rate control for activity region. +Valid only when H.264 and macroblock level RC is enabled (<constant>V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE</constant>). +Applicable to the H264 encoder.</entry> + </row> + <row><entry></entry></row> + <row id="v4l2-mpeg-mfc51-video-frame-skip-mode"> + <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_FRAME_SKIP_MODE</constant> </entry> + <entry>enum v4l2_mpeg_mfc51_video_frame_skip_mode</entry> + </row> + <row><entry spanname="descr"> +Indicates in what conditions the encoder should skip frames. If encoding a frame would cause the encoded stream to be larger then +a chosen data limit then the frame will be skipped. +Possible values are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_MPEG_MFC51_FRAME_SKIP_MODE_DISABLED</constant> </entry> + <entry>Frame skip mode is disabled.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_MFC51_FRAME_SKIP_MODE_LEVEL_LIMIT</constant> </entry> + <entry>Frame skip mode enabled and buffer limit is set by the chosen level and is defined by the standard.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_MFC51_FRAME_SKIP_MODE_BUF_LIMIT</constant> </entry> + <entry>Frame skip mode enabled and buffer limit is set by the VBV (MPEG1/2/4) or CPB (H264) buffer size control.</entry> + </row> + </tbody> + </entrytbl> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_RC_FIXED_TARGET_BIT</constant> </entry> + <entry>integer</entry> + </row><row><entry spanname="descr">Enable rate-control with fixed target bit. +If this setting is enabled, then the rate control logic of the encoder will calculate the average bitrate +for a GOP and keep it below or equal the set bitrate target. Otherwise the rate control logic calculates the +overall average bitrate for the stream and keeps it below or equal to the set bitrate. In the first case +the average bitrate for the whole stream will be smaller then the set bitrate. This is caused because the +average is calculated for smaller number of frames, on the other hand enabling this setting will ensure that +the stream will meet tight bandwidth contraints. Applicable to encoders. +</entry> + </row> + <row><entry></entry></row> + <row id="v4l2-mpeg-mfc51-video-force-frame-type"> + <entry spanname="id"><constant>V4L2_CID_MPEG_MFC51_VIDEO_FORCE_FRAME_TYPE</constant> </entry> + <entry>enum v4l2_mpeg_mfc51_video_force_frame_type</entry> + </row> + <row><entry spanname="descr">Force a frame type for the next queued buffer. Applicable to encoders. +Possible values are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_MPEG_MFC51_FORCE_FRAME_TYPE_DISABLED</constant> </entry> + <entry>Forcing a specific frame type disabled.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_MFC51_FORCE_FRAME_TYPE_I_FRAME</constant> </entry> + <entry>Force an I-frame.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_MFC51_FORCE_FRAME_TYPE_NOT_CODED</constant> </entry> + <entry>Force a non-coded frame.</entry> + </row> + </tbody> + </entrytbl> + </row> + </tbody> + </tgroup> + </table> + </section> + + <section> + <title>CX2341x MPEG Controls</title> + + <para>The following MPEG class controls deal with MPEG +encoding settings that are specific to the Conexant CX23415 and +CX23416 MPEG encoding chips.</para> + + <table pgwide="1" frame="none" id="cx2341x-control-id"> + <title>CX2341x Control IDs</title> + <tgroup cols="4"> + <colspec colname="c1" colwidth="1*" /> + <colspec colname="c2" colwidth="6*" /> + <colspec colname="c3" colwidth="2*" /> + <colspec colname="c4" colwidth="6*" /> + <spanspec namest="c1" nameend="c2" spanname="id" /> + <spanspec namest="c2" nameend="c4" spanname="descr" /> + <thead> + <row> + <entry spanname="id" align="left">ID</entry> + <entry align="left">Type</entry> + </row><row><entry spanname="descr" align="left">Description</entry> + </row> + </thead> + <tbody valign="top"> + <row><entry></entry></row> + <row id="v4l2-mpeg-cx2341x-video-spatial-filter-mode"> + <entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_SPATIAL_FILTER_MODE</constant> </entry> + <entry>enum v4l2_mpeg_cx2341x_video_spatial_filter_mode</entry> + </row><row><entry spanname="descr">Sets the Spatial +Filter mode (default <constant>MANUAL</constant>). Possible values +are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_MPEG_CX2341X_VIDEO_SPATIAL_FILTER_MODE_MANUAL</constant> </entry> + <entry>Choose the filter manually</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_CX2341X_VIDEO_SPATIAL_FILTER_MODE_AUTO</constant> </entry> + <entry>Choose the filter automatically</entry> + </row> + </tbody> + </entrytbl> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_SPATIAL_FILTER</constant> </entry> + <entry>integer (0-15)</entry> + </row><row><entry spanname="descr">The setting for the +Spatial Filter. 0 = off, 15 = maximum. (Default is 0.)</entry> + </row> + <row><entry></entry></row> + <row id="luma-spatial-filter-type"> + <entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE</constant> </entry> + <entry>enum v4l2_mpeg_cx2341x_video_luma_spatial_filter_type</entry> + </row><row><entry spanname="descr">Select the algorithm +to use for the Luma Spatial Filter (default +<constant>1D_HOR</constant>). Possible values:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE_OFF</constant> </entry> + <entry>No filter</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE_1D_HOR</constant> </entry> + <entry>One-dimensional horizontal</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE_1D_VERT</constant> </entry> + <entry>One-dimensional vertical</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE_2D_HV_SEPARABLE</constant> </entry> + <entry>Two-dimensional separable</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE_2D_SYM_NON_SEPARABLE</constant> </entry> + <entry>Two-dimensional symmetrical +non-separable</entry> + </row> + </tbody> + </entrytbl> + </row> + <row><entry></entry></row> + <row id="chroma-spatial-filter-type"> + <entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_CHROMA_SPATIAL_FILTER_TYPE</constant> </entry> + <entry>enum v4l2_mpeg_cx2341x_video_chroma_spatial_filter_type</entry> + </row><row><entry spanname="descr">Select the algorithm +for the Chroma Spatial Filter (default <constant>1D_HOR</constant>). +Possible values are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_MPEG_CX2341X_VIDEO_CHROMA_SPATIAL_FILTER_TYPE_OFF</constant> </entry> + <entry>No filter</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_CX2341X_VIDEO_CHROMA_SPATIAL_FILTER_TYPE_1D_HOR</constant> </entry> + <entry>One-dimensional horizontal</entry> + </row> + </tbody> + </entrytbl> + </row> + <row><entry></entry></row> + <row id="v4l2-mpeg-cx2341x-video-temporal-filter-mode"> + <entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_TEMPORAL_FILTER_MODE</constant> </entry> + <entry>enum v4l2_mpeg_cx2341x_video_temporal_filter_mode</entry> + </row><row><entry spanname="descr">Sets the Temporal +Filter mode (default <constant>MANUAL</constant>). Possible values +are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_MPEG_CX2341X_VIDEO_TEMPORAL_FILTER_MODE_MANUAL</constant> </entry> + <entry>Choose the filter manually</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_CX2341X_VIDEO_TEMPORAL_FILTER_MODE_AUTO</constant> </entry> + <entry>Choose the filter automatically</entry> + </row> + </tbody> + </entrytbl> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_TEMPORAL_FILTER</constant> </entry> + <entry>integer (0-31)</entry> + </row><row><entry spanname="descr">The setting for the +Temporal Filter. 0 = off, 31 = maximum. (Default is 8 for full-scale +capturing and 0 for scaled capturing.)</entry> + </row> + <row><entry></entry></row> + <row id="v4l2-mpeg-cx2341x-video-median-filter-type"> + <entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE</constant> </entry> + <entry>enum v4l2_mpeg_cx2341x_video_median_filter_type</entry> + </row><row><entry spanname="descr">Median Filter Type +(default <constant>OFF</constant>). Possible values are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE_OFF</constant> </entry> + <entry>No filter</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE_HOR</constant> </entry> + <entry>Horizontal filter</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE_VERT</constant> </entry> + <entry>Vertical filter</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE_HOR_VERT</constant> </entry> + <entry>Horizontal and vertical filter</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE_DIAG</constant> </entry> + <entry>Diagonal filter</entry> + </row> + </tbody> + </entrytbl> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_LUMA_MEDIAN_FILTER_BOTTOM</constant> </entry> + <entry>integer (0-255)</entry> + </row><row><entry spanname="descr">Threshold above which +the luminance median filter is enabled (default 0)</entry> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_LUMA_MEDIAN_FILTER_TOP</constant> </entry> + <entry>integer (0-255)</entry> + </row><row><entry spanname="descr">Threshold below which +the luminance median filter is enabled (default 255)</entry> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_CHROMA_MEDIAN_FILTER_BOTTOM</constant> </entry> + <entry>integer (0-255)</entry> + </row><row><entry spanname="descr">Threshold above which +the chroma median filter is enabled (default 0)</entry> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_VIDEO_CHROMA_MEDIAN_FILTER_TOP</constant> </entry> + <entry>integer (0-255)</entry> + </row><row><entry spanname="descr">Threshold below which +the chroma median filter is enabled (default 255)</entry> + </row> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_CX2341X_STREAM_INSERT_NAV_PACKETS</constant> </entry> + <entry>boolean</entry> + </row> + <row><entry spanname="descr">The CX2341X MPEG encoder +can insert one empty MPEG-2 PES packet into the stream between every +four video frames. The packet size is 2048 bytes, including the +packet_start_code_prefix and stream_id fields. The stream_id is 0xBF +(private stream 2). The payload consists of 0x00 bytes, to be filled +in by the application. 0 = do not insert, 1 = insert packets.</entry> + </row> + </tbody> + </tgroup> + </table> + </section> + + <section> + <title>VPX Control Reference</title> + + <para>The VPX controls include controls for encoding parameters + of VPx video codec.</para> + + <table pgwide="1" frame="none" id="vpx-control-id"> + <title>VPX Control IDs</title> + + <tgroup cols="4"> + <colspec colname="c1" colwidth="1*" /> + <colspec colname="c2" colwidth="6*" /> + <colspec colname="c3" colwidth="2*" /> + <colspec colname="c4" colwidth="6*" /> + <spanspec namest="c1" nameend="c2" spanname="id" /> + <spanspec namest="c2" nameend="c4" spanname="descr" /> + <thead> + <row> + <entry spanname="id" align="left">ID</entry> + <entry align="left">Type</entry> + </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry> + </row> + </thead> + <tbody valign="top"> + <row><entry></entry></row> + + <row><entry></entry></row> + <row id="v4l2-vpx-num-partitions"> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS</constant></entry> + <entry>enum v4l2_vp8_num_partitions</entry> + </row> + <row><entry spanname="descr">The number of token partitions to use in VP8 encoder. +Possible values are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_CID_MPEG_VIDEO_VPX_1_PARTITION</constant></entry> + <entry>1 coefficient partition</entry> + </row> + <row> + <entry><constant>V4L2_CID_MPEG_VIDEO_VPX_2_PARTITIONS</constant></entry> + <entry>2 coefficient partitions</entry> + </row> + <row> + <entry><constant>V4L2_CID_MPEG_VIDEO_VPX_4_PARTITIONS</constant></entry> + <entry>4 coefficient partitions</entry> + </row> + <row> + <entry><constant>V4L2_CID_MPEG_VIDEO_VPX_8_PARTITIONS</constant></entry> + <entry>8 coefficient partitions</entry> + </row> + </tbody> + </entrytbl> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VPX_IMD_DISABLE_4X4</constant></entry> + <entry>boolean</entry> + </row> + <row><entry spanname="descr">Setting this prevents intra 4x4 mode in the intra mode decision.</entry> + </row> + + <row><entry></entry></row> + <row id="v4l2-vpx-num-ref-frames"> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES</constant></entry> + <entry>enum v4l2_vp8_num_ref_frames</entry> + </row> + <row><entry spanname="descr">The number of reference pictures for encoding P frames. +Possible values are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_CID_MPEG_VIDEO_VPX_1_REF_FRAME</constant></entry> + <entry>Last encoded frame will be searched</entry> + </row> + <row> + <entry><constant>V4L2_CID_MPEG_VIDEO_VPX_2_REF_FRAME</constant></entry> + <entry>Two frames will be searched among the last encoded frame, the golden frame +and the alternate reference (altref) frame. The encoder implementation will decide which two are chosen.</entry> + </row> + <row> + <entry><constant>V4L2_CID_MPEG_VIDEO_VPX_3_REF_FRAME</constant></entry> + <entry>The last encoded frame, the golden frame and the altref frame will be searched.</entry> + </row> + </tbody> + </entrytbl> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VPX_FILTER_LEVEL</constant></entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Indicates the loop filter level. The adjustment of the loop +filter level is done via a delta value against a baseline loop filter value.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VPX_FILTER_SHARPNESS</constant></entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">This parameter affects the loop filter. Anything above +zero weakens the deblocking effect on the loop filter.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_REF_PERIOD</constant></entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Sets the refresh period for the golden frame. The period is defined +in number of frames. For a value of 'n', every nth frame starting from the first key frame will be taken as a golden frame. +For eg. for encoding sequence of 0, 1, 2, 3, 4, 5, 6, 7 where the golden frame refresh period is set as 4, the frames +0, 4, 8 etc will be taken as the golden frames as frame 0 is always a key frame.</entry> + </row> + + <row><entry></entry></row> + <row id="v4l2-vpx-golden-frame-sel"> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL</constant></entry> + <entry>enum v4l2_vp8_golden_frame_sel</entry> + </row> + <row><entry spanname="descr">Selects the golden frame for encoding. +Possible values are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_USE_PREV</constant></entry> + <entry>Use the (n-2)th frame as a golden frame, current frame index being 'n'.</entry> + </row> + <row> + <entry><constant>V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_USE_REF_PERIOD</constant></entry> + <entry>Use the previous specific frame indicated by +V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_REF_PERIOD as a golden frame.</entry> + </row> + </tbody> + </entrytbl> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VPX_MIN_QP</constant></entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Minimum quantization parameter for VP8.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VPX_MAX_QP</constant></entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Maximum quantization parameter for VP8.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VPX_I_FRAME_QP</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Quantization parameter for an I frame for VP8.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VPX_P_FRAME_QP</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Quantization parameter for a P frame for VP8.</entry> + </row> + + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_MPEG_VIDEO_VPX_PROFILE</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Select the desired profile for VPx encoder. +Acceptable values are 0, 1, 2 and 3 corresponding to encoder profiles 0, 1, 2 and 3.</entry> + </row> + + <row><entry></entry></row> + </tbody> + </tgroup> + </table> + + </section> + </section> + + <section id="camera-controls"> + <title>Camera Control Reference</title> + + <para>The Camera class includes controls for mechanical (or +equivalent digital) features of a device such as controllable lenses +or sensors.</para> + + <table pgwide="1" frame="none" id="camera-control-id"> + <title>Camera Control IDs</title> + <tgroup cols="4"> + <colspec colname="c1" colwidth="1*" /> + <colspec colname="c2" colwidth="6*" /> + <colspec colname="c3" colwidth="2*" /> + <colspec colname="c4" colwidth="6*" /> + <spanspec namest="c1" nameend="c2" spanname="id" /> + <spanspec namest="c2" nameend="c4" spanname="descr" /> + <thead> + <row> + <entry spanname="id" align="left">ID</entry> + <entry align="left">Type</entry> + </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry> + </row> + </thead> + <tbody valign="top"> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_CAMERA_CLASS</constant> </entry> + <entry>class</entry> + </row><row><entry spanname="descr">The Camera class +descriptor. Calling &VIDIOC-QUERYCTRL; for this control will return a +description of this control class.</entry> + </row> + <row><entry></entry></row> + + <row id="v4l2-exposure-auto-type"> + <entry spanname="id"><constant>V4L2_CID_EXPOSURE_AUTO</constant> </entry> + <entry>enum v4l2_exposure_auto_type</entry> + </row><row><entry spanname="descr">Enables automatic +adjustments of the exposure time and/or iris aperture. The effect of +manual changes of the exposure time or iris aperture while these +features are enabled is undefined, drivers should ignore such +requests. Possible values are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_EXPOSURE_AUTO</constant> </entry> + <entry>Automatic exposure time, automatic iris +aperture.</entry> + </row> + <row> + <entry><constant>V4L2_EXPOSURE_MANUAL</constant> </entry> + <entry>Manual exposure time, manual iris.</entry> + </row> + <row> + <entry><constant>V4L2_EXPOSURE_SHUTTER_PRIORITY</constant> </entry> + <entry>Manual exposure time, auto iris.</entry> + </row> + <row> + <entry><constant>V4L2_EXPOSURE_APERTURE_PRIORITY</constant> </entry> + <entry>Auto exposure time, manual iris.</entry> + </row> + </tbody> + </entrytbl> + </row> + <row><entry></entry></row> + + <row> + <entry spanname="id"><constant>V4L2_CID_EXPOSURE_ABSOLUTE</constant> </entry> + <entry>integer</entry> + </row><row><entry spanname="descr">Determines the exposure +time of the camera sensor. The exposure time is limited by the frame +interval. Drivers should interpret the values as 100 µs units, +where the value 1 stands for 1/10000th of a second, 10000 for 1 second +and 100000 for 10 seconds.</entry> + </row> + <row><entry></entry></row> + + <row> + <entry spanname="id"><constant>V4L2_CID_EXPOSURE_AUTO_PRIORITY</constant> </entry> + <entry>boolean</entry> + </row><row><entry spanname="descr">When +<constant>V4L2_CID_EXPOSURE_AUTO</constant> is set to +<constant>AUTO</constant> or <constant>APERTURE_PRIORITY</constant>, +this control determines if the device may dynamically vary the frame +rate. By default this feature is disabled (0) and the frame rate must +remain constant.</entry> + </row> + <row><entry></entry></row> + + <row> + <entry spanname="id"><constant>V4L2_CID_EXPOSURE_BIAS</constant> </entry> + <entry>integer menu</entry> + </row><row><entry spanname="descr"> Determines the automatic +exposure compensation, it is effective only when <constant>V4L2_CID_EXPOSURE_AUTO</constant> +control is set to <constant>AUTO</constant>, <constant>SHUTTER_PRIORITY </constant> +or <constant>APERTURE_PRIORITY</constant>. +It is expressed in terms of EV, drivers should interpret the values as 0.001 EV +units, where the value 1000 stands for +1 EV. +<para>Increasing the exposure compensation value is equivalent to decreasing +the exposure value (EV) and will increase the amount of light at the image +sensor. The camera performs the exposure compensation by adjusting absolute +exposure time and/or aperture.</para></entry> + </row> + <row><entry></entry></row> + + <row id="v4l2-exposure-metering"> + <entry spanname="id"><constant>V4L2_CID_EXPOSURE_METERING</constant> </entry> + <entry>enum v4l2_exposure_metering</entry> + </row><row><entry spanname="descr">Determines how the camera measures +the amount of light available for the frame exposure. Possible values are:</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_EXPOSURE_METERING_AVERAGE</constant> </entry> + <entry>Use the light information coming from the entire frame +and average giving no weighting to any particular portion of the metered area. + </entry> + </row> + <row> + <entry><constant>V4L2_EXPOSURE_METERING_CENTER_WEIGHTED</constant> </entry> + <entry>Average the light information coming from the entire frame +giving priority to the center of the metered area.</entry> + </row> + <row> + <entry><constant>V4L2_EXPOSURE_METERING_SPOT</constant> </entry> + <entry>Measure only very small area at the center of the frame.</entry> + </row> + <row> + <entry><constant>V4L2_EXPOSURE_METERING_MATRIX</constant> </entry> + <entry>A multi-zone metering. The light intensity is measured +in several points of the frame and the the results are combined. The +algorithm of the zones selection and their significance in calculating the +final value is device dependent.</entry> + </row> + </tbody> + </entrytbl> + </row> + <row><entry></entry></row> + + <row> + <entry spanname="id"><constant>V4L2_CID_PAN_RELATIVE</constant> </entry> + <entry>integer</entry> + </row><row><entry spanname="descr">This control turns the +camera horizontally by the specified amount. The unit is undefined. A +positive value moves the camera to the right (clockwise when viewed +from above), a negative value to the left. A value of zero does not +cause motion. This is a write-only control.</entry> + </row> + <row><entry></entry></row> + + <row> + <entry spanname="id"><constant>V4L2_CID_TILT_RELATIVE</constant> </entry> + <entry>integer</entry> + </row><row><entry spanname="descr">This control turns the +camera vertically by the specified amount. The unit is undefined. A +positive value moves the camera up, a negative value down. A value of +zero does not cause motion. This is a write-only control.</entry> + </row> + <row><entry></entry></row> + + <row> + <entry spanname="id"><constant>V4L2_CID_PAN_RESET</constant> </entry> + <entry>button</entry> + </row><row><entry spanname="descr">When this control is set, +the camera moves horizontally to the default position.</entry> + </row> + <row><entry></entry></row> + + <row> + <entry spanname="id"><constant>V4L2_CID_TILT_RESET</constant> </entry> + <entry>button</entry> + </row><row><entry spanname="descr">When this control is set, +the camera moves vertically to the default position.</entry> + </row> + <row><entry></entry></row> + + <row> + <entry spanname="id"><constant>V4L2_CID_PAN_ABSOLUTE</constant> </entry> + <entry>integer</entry> + </row><row><entry spanname="descr">This control +turns the camera horizontally to the specified position. Positive +values move the camera to the right (clockwise when viewed from above), +negative values to the left. Drivers should interpret the values as arc +seconds, with valid values between -180 * 3600 and +180 * 3600 +inclusive.</entry> + </row> + <row><entry></entry></row> + + <row> + <entry spanname="id"><constant>V4L2_CID_TILT_ABSOLUTE</constant> </entry> + <entry>integer</entry> + </row><row><entry spanname="descr">This control +turns the camera vertically to the specified position. Positive values +move the camera up, negative values down. Drivers should interpret the +values as arc seconds, with valid values between -180 * 3600 and +180 +* 3600 inclusive.</entry> + </row> + <row><entry></entry></row> + + <row> + <entry spanname="id"><constant>V4L2_CID_FOCUS_ABSOLUTE</constant> </entry> + <entry>integer</entry> + </row><row><entry spanname="descr">This control sets the +focal point of the camera to the specified position. The unit is +undefined. Positive values set the focus closer to the camera, +negative values towards infinity.</entry> + </row> + <row><entry></entry></row> + + <row> + <entry spanname="id"><constant>V4L2_CID_FOCUS_RELATIVE</constant> </entry> + <entry>integer</entry> + </row><row><entry spanname="descr">This control moves the +focal point of the camera by the specified amount. The unit is +undefined. Positive values move the focus closer to the camera, +negative values towards infinity. This is a write-only control.</entry> + </row> + <row><entry></entry></row> + + <row> + <entry spanname="id"><constant>V4L2_CID_FOCUS_AUTO</constant> </entry> + <entry>boolean</entry> + </row><row><entry spanname="descr">Enables continuous automatic +focus adjustments. The effect of manual focus adjustments while this feature +is enabled is undefined, drivers should ignore such requests.</entry> + </row> + <row><entry></entry></row> + + <row> + <entry spanname="id"><constant>V4L2_CID_AUTO_FOCUS_START</constant> </entry> + <entry>button</entry> + </row><row><entry spanname="descr">Starts single auto focus process. +The effect of setting this control when <constant>V4L2_CID_FOCUS_AUTO</constant> +is set to <constant>TRUE</constant> (1) is undefined, drivers should ignore +such requests.</entry> + </row> + <row><entry></entry></row> + + <row> + <entry spanname="id"><constant>V4L2_CID_AUTO_FOCUS_STOP</constant> </entry> + <entry>button</entry> + </row><row><entry spanname="descr">Aborts automatic focusing +started with <constant>V4L2_CID_AUTO_FOCUS_START</constant> control. It is +effective only when the continuous autofocus is disabled, that is when +<constant>V4L2_CID_FOCUS_AUTO</constant> control is set to <constant>FALSE +</constant> (0).</entry> + </row> + <row><entry></entry></row> + + <row id="v4l2-auto-focus-status"> + <entry spanname="id"> + <constant>V4L2_CID_AUTO_FOCUS_STATUS</constant> </entry> + <entry>bitmask</entry> + </row> + <row><entry spanname="descr">The automatic focus status. This is a read-only + control.</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_AUTO_FOCUS_STATUS_IDLE</constant> </entry> + <entry>Automatic focus is not active.</entry> + </row> + <row> + <entry><constant>V4L2_AUTO_FOCUS_STATUS_BUSY</constant> </entry> + <entry>Automatic focusing is in progress.</entry> + </row> + <row> + <entry><constant>V4L2_AUTO_FOCUS_STATUS_REACHED</constant> </entry> + <entry>Focus has been reached.</entry> + </row> + <row> + <entry><constant>V4L2_AUTO_FOCUS_STATUS_FAILED</constant> </entry> + <entry>Automatic focus has failed, the driver will not + transition from this state until another action is + performed by an application.</entry> + </row> + </tbody> + </entrytbl> + </row> + <row><entry spanname="descr"> +Setting <constant>V4L2_LOCK_FOCUS</constant> lock bit of the <constant>V4L2_CID_3A_LOCK +</constant> control may stop updates of the <constant>V4L2_CID_AUTO_FOCUS_STATUS</constant> +control value.</entry> + </row> + <row><entry></entry></row> + + <row id="v4l2-auto-focus-range"> + <entry spanname="id"> + <constant>V4L2_CID_AUTO_FOCUS_RANGE</constant> </entry> + <entry>enum v4l2_auto_focus_range</entry> + </row> + <row><entry spanname="descr">Determines auto focus distance range +for which lens may be adjusted. </entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_AUTO_FOCUS_RANGE_AUTO</constant> </entry> + <entry>The camera automatically selects the focus range.</entry> + </row> + <row> + <entry><constant>V4L2_AUTO_FOCUS_RANGE_NORMAL</constant> </entry> + <entry>Normal distance range, limited for best automatic focus +performance.</entry> + </row> + <row> + <entry><constant>V4L2_AUTO_FOCUS_RANGE_MACRO</constant> </entry> + <entry>Macro (close-up) auto focus. The camera will +use its minimum possible distance for auto focus.</entry> + </row> + <row> + <entry><constant>V4L2_AUTO_FOCUS_RANGE_INFINITY</constant> </entry> + <entry>The lens is set to focus on an object at infinite distance.</entry> + </row> + </tbody> + </entrytbl> + </row> + <row><entry></entry></row> + + <row> + <entry spanname="id"><constant>V4L2_CID_ZOOM_ABSOLUTE</constant> </entry> + <entry>integer</entry> + </row><row><entry spanname="descr">Specify the objective lens +focal length as an absolute value. The zoom unit is driver-specific and its +value should be a positive integer.</entry> + </row> + <row><entry></entry></row> + + <row> + <entry spanname="id"><constant>V4L2_CID_ZOOM_RELATIVE</constant> </entry> + <entry>integer</entry> + </row><row><entry spanname="descr">Specify the objective lens +focal length relatively to the current value. Positive values move the zoom +lens group towards the telephoto direction, negative values towards the +wide-angle direction. The zoom unit is driver-specific. This is a write-only control.</entry> + </row> + <row><entry></entry></row> + + <row> + <entry spanname="id"><constant>V4L2_CID_ZOOM_CONTINUOUS</constant> </entry> + <entry>integer</entry> + </row><row><entry spanname="descr">Move the objective lens group +at the specified speed until it reaches physical device limits or until an +explicit request to stop the movement. A positive value moves the zoom lens +group towards the telephoto direction. A value of zero stops the zoom lens +group movement. A negative value moves the zoom lens group towards the +wide-angle direction. The zoom speed unit is driver-specific.</entry> + </row> + <row><entry></entry></row> + + <row> + <entry spanname="id"><constant>V4L2_CID_IRIS_ABSOLUTE</constant> </entry> + <entry>integer</entry> + </row><row><entry spanname="descr">This control sets the +camera's aperture to the specified value. The unit is undefined. +Larger values open the iris wider, smaller values close it.</entry> + </row> + <row><entry></entry></row> + + <row> + <entry spanname="id"><constant>V4L2_CID_IRIS_RELATIVE</constant> </entry> + <entry>integer</entry> + </row><row><entry spanname="descr">This control modifies the +camera's aperture by the specified amount. The unit is undefined. +Positive values open the iris one step further, negative values close +it one step further. This is a write-only control.</entry> + </row> + <row><entry></entry></row> + + <row> + <entry spanname="id"><constant>V4L2_CID_PRIVACY</constant> </entry> + <entry>boolean</entry> + </row><row><entry spanname="descr">Prevent video from being acquired +by the camera. When this control is set to <constant>TRUE</constant> (1), no +image can be captured by the camera. Common means to enforce privacy are +mechanical obturation of the sensor and firmware image processing, but the +device is not restricted to these methods. Devices that implement the privacy +control must support read access and may support write access.</entry> + </row> + + <row> + <entry spanname="id"><constant>V4L2_CID_BAND_STOP_FILTER</constant> </entry> + <entry>integer</entry> + </row><row><entry spanname="descr">Switch the band-stop filter of a +camera sensor on or off, or specify its strength. Such band-stop filters can +be used, for example, to filter out the fluorescent light component.</entry> + </row> + <row><entry></entry></row> + + <row id="v4l2-auto-n-preset-white-balance"> + <entry spanname="id"><constant>V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE</constant> </entry> + <entry>enum v4l2_auto_n_preset_white_balance</entry> + </row><row><entry spanname="descr">Sets white balance to automatic, +manual or a preset. The presets determine color temperature of the light as +a hint to the camera for white balance adjustments resulting in most accurate +color representation. The following white balance presets are listed in order +of increasing color temperature.</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_WHITE_BALANCE_MANUAL</constant> </entry> + <entry>Manual white balance.</entry> + </row> + <row> + <entry><constant>V4L2_WHITE_BALANCE_AUTO</constant> </entry> + <entry>Automatic white balance adjustments.</entry> + </row> + <row> + <entry><constant>V4L2_WHITE_BALANCE_INCANDESCENT</constant> </entry> + <entry>White balance setting for incandescent (tungsten) lighting. +It generally cools down the colors and corresponds approximately to 2500...3500 K +color temperature range.</entry> + </row> + <row> + <entry><constant>V4L2_WHITE_BALANCE_FLUORESCENT</constant> </entry> + <entry>White balance preset for fluorescent lighting. +It corresponds approximately to 4000...5000 K color temperature.</entry> + </row> + <row> + <entry><constant>V4L2_WHITE_BALANCE_FLUORESCENT_H</constant> </entry> + <entry>With this setting the camera will compensate for +fluorescent H lighting.</entry> + </row> + <row> + <entry><constant>V4L2_WHITE_BALANCE_HORIZON</constant> </entry> + <entry>White balance setting for horizon daylight. +It corresponds approximately to 5000 K color temperature.</entry> + </row> + <row> + <entry><constant>V4L2_WHITE_BALANCE_DAYLIGHT</constant> </entry> + <entry>White balance preset for daylight (with clear sky). +It corresponds approximately to 5000...6500 K color temperature.</entry> + </row> + <row> + <entry><constant>V4L2_WHITE_BALANCE_FLASH</constant> </entry> + <entry>With this setting the camera will compensate for the flash +light. It slightly warms up the colors and corresponds roughly to 5000...5500 K +color temperature.</entry> + </row> + <row> + <entry><constant>V4L2_WHITE_BALANCE_CLOUDY</constant> </entry> + <entry>White balance preset for moderately overcast sky. +This option corresponds approximately to 6500...8000 K color temperature +range.</entry> + </row> + <row> + <entry><constant>V4L2_WHITE_BALANCE_SHADE</constant> </entry> + <entry>White balance preset for shade or heavily overcast +sky. It corresponds approximately to 9000...10000 K color temperature. +</entry> + </row> + </tbody> + </entrytbl> + </row> + <row><entry></entry></row> + + <row id="v4l2-wide-dynamic-range"> + <entry spanname="id"><constant>V4L2_CID_WIDE_DYNAMIC_RANGE</constant></entry> + <entry>boolean</entry> + </row> + <row> + <entry spanname="descr">Enables or disables the camera's wide dynamic +range feature. This feature allows to obtain clear images in situations where +intensity of the illumination varies significantly throughout the scene, i.e. +there are simultaneously very dark and very bright areas. It is most commonly +realized in cameras by combining two subsequent frames with different exposure +times. <footnote id="ctypeconv"><para> This control may be changed to a menu +control in the future, if more options are required.</para></footnote></entry> + </row> + <row><entry></entry></row> + + <row id="v4l2-image-stabilization"> + <entry spanname="id"><constant>V4L2_CID_IMAGE_STABILIZATION</constant></entry> + <entry>boolean</entry> + </row> + <row> + <entry spanname="descr">Enables or disables image stabilization. + <footnoteref linkend="ctypeconv"/></entry> + </row> + <row><entry></entry></row> + + <row> + <entry spanname="id"><constant>V4L2_CID_ISO_SENSITIVITY</constant> </entry> + <entry>integer menu</entry> + </row><row><entry spanname="descr">Determines ISO equivalent of an +image sensor indicating the sensor's sensitivity to light. The numbers are +expressed in arithmetic scale, as per <xref linkend="iso12232" /> standard, +where doubling the sensor sensitivity is represented by doubling the numerical +ISO value. Applications should interpret the values as standard ISO values +multiplied by 1000, e.g. control value 800 stands for ISO 0.8. Drivers will +usually support only a subset of standard ISO values. The effect of setting +this control while the <constant>V4L2_CID_ISO_SENSITIVITY_AUTO</constant> +control is set to a value other than <constant>V4L2_CID_ISO_SENSITIVITY_MANUAL +</constant> is undefined, drivers should ignore such requests.</entry> + </row> + <row><entry></entry></row> + + <row id="v4l2-iso-sensitivity-auto-type"> + <entry spanname="id"><constant>V4L2_CID_ISO_SENSITIVITY_AUTO</constant> </entry> + <entry>enum v4l2_iso_sensitivity_type</entry> + </row><row><entry spanname="descr">Enables or disables automatic ISO +sensitivity adjustments.</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_CID_ISO_SENSITIVITY_MANUAL</constant> </entry> + <entry>Manual ISO sensitivity.</entry> + </row> + <row> + <entry><constant>V4L2_CID_ISO_SENSITIVITY_AUTO</constant> </entry> + <entry>Automatic ISO sensitivity adjustments.</entry> + </row> + </tbody> + </entrytbl> + </row> + <row><entry></entry></row> + + <row id="v4l2-scene-mode"> + <entry spanname="id"><constant>V4L2_CID_SCENE_MODE</constant> </entry> + <entry>enum v4l2_scene_mode</entry> + </row><row><entry spanname="descr">This control allows to select +scene programs as the camera automatic modes optimized for common shooting +scenes. Within these modes the camera determines best exposure, aperture, +focusing, light metering, white balance and equivalent sensitivity. The +controls of those parameters are influenced by the scene mode control. +An exact behavior in each mode is subject to the camera specification. + +<para>When the scene mode feature is not used, this control should be set to +<constant>V4L2_SCENE_MODE_NONE</constant> to make sure the other possibly +related controls are accessible. The following scene programs are defined: +</para> +</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_SCENE_MODE_NONE</constant> </entry> + <entry>The scene mode feature is disabled.</entry> + </row> + <row> + <entry><constant>V4L2_SCENE_MODE_BACKLIGHT</constant> </entry> + <entry>Backlight. Compensates for dark shadows when light is + coming from behind a subject, also by automatically turning + on the flash.</entry> + </row> + <row> + <entry><constant>V4L2_SCENE_MODE_BEACH_SNOW</constant> </entry> + <entry>Beach and snow. This mode compensates for all-white or +bright scenes, which tend to look gray and low contrast, when camera's automatic +exposure is based on an average scene brightness. To compensate, this mode +automatically slightly overexposes the frames. The white balance may also be +adjusted to compensate for the fact that reflected snow looks bluish rather +than white.</entry> + </row> + <row> + <entry><constant>V4L2_SCENE_MODE_CANDLELIGHT</constant> </entry> + <entry>Candle light. The camera generally raises the ISO +sensitivity and lowers the shutter speed. This mode compensates for relatively +close subject in the scene. The flash is disabled in order to preserve the +ambiance of the light.</entry> + </row> + <row> + <entry><constant>V4L2_SCENE_MODE_DAWN_DUSK</constant> </entry> + <entry>Dawn and dusk. Preserves the colors seen in low +natural light before dusk and after down. The camera may turn off the flash, +and automatically focus at infinity. It will usually boost saturation and +lower the shutter speed.</entry> + </row> + <row> + <entry><constant>V4L2_SCENE_MODE_FALL_COLORS</constant> </entry> + <entry>Fall colors. Increases saturation and adjusts white +balance for color enhancement. Pictures of autumn leaves get saturated reds +and yellows.</entry> + </row> + <row> + <entry><constant>V4L2_SCENE_MODE_FIREWORKS</constant> </entry> + <entry>Fireworks. Long exposure times are used to capture +the expanding burst of light from a firework. The camera may invoke image +stabilization.</entry> + </row> + <row> + <entry><constant>V4L2_SCENE_MODE_LANDSCAPE</constant> </entry> + <entry>Landscape. The camera may choose a small aperture to +provide deep depth of field and long exposure duration to help capture detail +in dim light conditions. The focus is fixed at infinity. Suitable for distant +and wide scenery.</entry> + </row> + <row> + <entry><constant>V4L2_SCENE_MODE_NIGHT</constant> </entry> + <entry>Night, also known as Night Landscape. Designed for low +light conditions, it preserves detail in the dark areas without blowing out bright +objects. The camera generally sets itself to a medium-to-high ISO sensitivity, +with a relatively long exposure time, and turns flash off. As such, there will be +increased image noise and the possibility of blurred image.</entry> + </row> + <row> + <entry><constant>V4L2_SCENE_MODE_PARTY_INDOOR</constant> </entry> + <entry>Party and indoor. Designed to capture indoor scenes +that are lit by indoor background lighting as well as the flash. The camera +usually increases ISO sensitivity, and adjusts exposure for the low light +conditions.</entry> + </row> + <row> + <entry><constant>V4L2_SCENE_MODE_PORTRAIT</constant> </entry> + <entry>Portrait. The camera adjusts the aperture so that the +depth of field is reduced, which helps to isolate the subject against a smooth +background. Most cameras recognize the presence of faces in the scene and focus +on them. The color hue is adjusted to enhance skin tones. The intensity of the +flash is often reduced.</entry> + </row> + <row> + <entry><constant>V4L2_SCENE_MODE_SPORTS</constant> </entry> + <entry>Sports. Significantly increases ISO and uses a fast +shutter speed to freeze motion of rapidly-moving subjects. Increased image +noise may be seen in this mode.</entry> + </row> + <row> + <entry><constant>V4L2_SCENE_MODE_SUNSET</constant> </entry> + <entry>Sunset. Preserves deep hues seen in sunsets and +sunrises. It bumps up the saturation.</entry> + </row> + <row> + <entry><constant>V4L2_SCENE_MODE_TEXT</constant> </entry> + <entry>Text. It applies extra contrast and sharpness, it is +typically a black-and-white mode optimized for readability. Automatic focus +may be switched to close-up mode and this setting may also involve some +lens-distortion correction.</entry> + </row> + </tbody> + </entrytbl> + </row> + <row><entry></entry></row> + + <row> + <entry spanname="id"><constant>V4L2_CID_3A_LOCK</constant></entry> + <entry>bitmask</entry> + </row> + <row> + <entry spanname="descr">This control locks or unlocks the automatic +focus, exposure and white balance. The automatic adjustments can be paused +independently by setting the corresponding lock bit to 1. The camera then retains +the settings until the lock bit is cleared. The following lock bits are defined: +</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_LOCK_EXPOSURE</constant></entry> + <entry>Automatic exposure adjustments lock.</entry> + </row> + <row> + <entry><constant>V4L2_LOCK_WHITE_BALANCE</constant></entry> + <entry>Automatic white balance adjustments lock.</entry> + </row> + <row> + <entry><constant>V4L2_LOCK_FOCUS</constant></entry> + <entry>Automatic focus lock.</entry> + </row> + </tbody> + </entrytbl> + </row> + <row><entry spanname="descr"> +When a given algorithm is not enabled, drivers should ignore requests +to lock it and should return no error. An example might be an application +setting bit <constant>V4L2_LOCK_WHITE_BALANCE</constant> when the +<constant>V4L2_CID_AUTO_WHITE_BALANCE</constant> control is set to +<constant>FALSE</constant>. The value of this control may be changed +by exposure, white balance or focus controls.</entry> + </row> + <row><entry></entry></row> + + </tbody> + </tgroup> + </table> + </section> + + <section id="fm-tx-controls"> + <title>FM Transmitter Control Reference</title> + + <para>The FM Transmitter (FM_TX) class includes controls for common features of +FM transmissions capable devices. Currently this class includes parameters for audio +compression, pilot tone generation, audio deviation limiter, RDS transmission and +tuning power features.</para> + + <table pgwide="1" frame="none" id="fm-tx-control-id"> + <title>FM_TX Control IDs</title> + + <tgroup cols="4"> + <colspec colname="c1" colwidth="1*" /> + <colspec colname="c2" colwidth="6*" /> + <colspec colname="c3" colwidth="2*" /> + <colspec colname="c4" colwidth="6*" /> + <spanspec namest="c1" nameend="c2" spanname="id" /> + <spanspec namest="c2" nameend="c4" spanname="descr" /> + <thead> + <row> + <entry spanname="id" align="left">ID</entry> + <entry align="left">Type</entry> + </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry> + </row> + </thead> + <tbody valign="top"> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_FM_TX_CLASS</constant> </entry> + <entry>class</entry> + </row><row><entry spanname="descr">The FM_TX class +descriptor. Calling &VIDIOC-QUERYCTRL; for this control will return a +description of this control class.</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_RDS_TX_DEVIATION</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Configures RDS signal frequency deviation level in Hz. +The range and step are driver-specific.</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_RDS_TX_PI</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Sets the RDS Programme Identification field +for transmission.</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_RDS_TX_PTY</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Sets the RDS Programme Type field for transmission. +This encodes up to 31 pre-defined programme types.</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_RDS_TX_PS_NAME</constant> </entry> + <entry>string</entry> + </row> + <row><entry spanname="descr">Sets the Programme Service name (PS_NAME) for transmission. +It is intended for static display on a receiver. It is the primary aid to listeners in programme service +identification and selection. In Annex E of <xref linkend="iec62106" />, the RDS specification, +there is a full description of the correct character encoding for Programme Service name strings. +Also from RDS specification, PS is usually a single eight character text. However, it is also possible +to find receivers which can scroll strings sized as 8 x N characters. So, this control must be configured +with steps of 8 characters. The result is it must always contain a string with size multiple of 8.</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_RDS_TX_RADIO_TEXT</constant> </entry> + <entry>string</entry> + </row> + <row><entry spanname="descr">Sets the Radio Text info for transmission. It is a textual description of +what is being broadcasted. RDS Radio Text can be applied when broadcaster wishes to transmit longer PS names, +programme-related information or any other text. In these cases, RadioText should be used in addition to +<constant>V4L2_CID_RDS_TX_PS_NAME</constant>. The encoding for Radio Text strings is also fully described +in Annex E of <xref linkend="iec62106" />. The length of Radio Text strings depends on which RDS Block is being +used to transmit it, either 32 (2A block) or 64 (2B block). However, it is also possible +to find receivers which can scroll strings sized as 32 x N or 64 x N characters. So, this control must be configured +with steps of 32 or 64 characters. The result is it must always contain a string with size multiple of 32 or 64. </entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_AUDIO_LIMITER_ENABLED</constant> </entry> + <entry>boolean</entry> + </row> + <row><entry spanname="descr">Enables or disables the audio deviation limiter feature. +The limiter is useful when trying to maximize the audio volume, minimize receiver-generated +distortion and prevent overmodulation. +</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_AUDIO_LIMITER_RELEASE_TIME</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Sets the audio deviation limiter feature release time. +Unit is in useconds. Step and range are driver-specific.</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_AUDIO_LIMITER_DEVIATION</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Configures audio frequency deviation level in Hz. +The range and step are driver-specific.</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_AUDIO_COMPRESSION_ENABLED</constant> </entry> + <entry>boolean</entry> + </row> + <row><entry spanname="descr">Enables or disables the audio compression feature. +This feature amplifies signals below the threshold by a fixed gain and compresses audio +signals above the threshold by the ratio of Threshold/(Gain + Threshold).</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_AUDIO_COMPRESSION_GAIN</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Sets the gain for audio compression feature. It is +a dB value. The range and step are driver-specific.</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_AUDIO_COMPRESSION_THRESHOLD</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Sets the threshold level for audio compression freature. +It is a dB value. The range and step are driver-specific.</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_AUDIO_COMPRESSION_ATTACK_TIME</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Sets the attack time for audio compression feature. +It is a useconds value. The range and step are driver-specific.</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_AUDIO_COMPRESSION_RELEASE_TIME</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Sets the release time for audio compression feature. +It is a useconds value. The range and step are driver-specific.</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_PILOT_TONE_ENABLED</constant> </entry> + <entry>boolean</entry> + </row> + <row><entry spanname="descr">Enables or disables the pilot tone generation feature.</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_PILOT_TONE_DEVIATION</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Configures pilot tone frequency deviation level. Unit is +in Hz. The range and step are driver-specific.</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_PILOT_TONE_FREQUENCY</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Configures pilot tone frequency value. Unit is +in Hz. The range and step are driver-specific.</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_TUNE_PREEMPHASIS</constant> </entry> + <entry>enum v4l2_preemphasis</entry> + </row> + <row id="v4l2-preemphasis"><entry spanname="descr">Configures the pre-emphasis value for broadcasting. +A pre-emphasis filter is applied to the broadcast to accentuate the high audio frequencies. +Depending on the region, a time constant of either 50 or 75 useconds is used. The enum v4l2_preemphasis +defines possible values for pre-emphasis. Here they are:</entry> + </row><row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_PREEMPHASIS_DISABLED</constant> </entry> + <entry>No pre-emphasis is applied.</entry> + </row> + <row> + <entry><constant>V4L2_PREEMPHASIS_50_uS</constant> </entry> + <entry>A pre-emphasis of 50 uS is used.</entry> + </row> + <row> + <entry><constant>V4L2_PREEMPHASIS_75_uS</constant> </entry> + <entry>A pre-emphasis of 75 uS is used.</entry> + </row> + </tbody> + </entrytbl> + + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_TUNE_POWER_LEVEL</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">Sets the output power level for signal transmission. +Unit is in dBuV. Range and step are driver-specific.</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_TUNE_ANTENNA_CAPACITOR</constant> </entry> + <entry>integer</entry> + </row> + <row><entry spanname="descr">This selects the value of antenna tuning capacitor +manually or automatically if set to zero. Unit, range and step are driver-specific.</entry> + </row> + <row><entry></entry></row> + </tbody> + </tgroup> + </table> + +<para>For more details about RDS specification, refer to +<xref linkend="iec62106" /> document, from CENELEC.</para> + </section> + + <section id="flash-controls"> + <title>Flash Control Reference</title> + + <note> + <title>Experimental</title> + + <para>This is an <link linkend="experimental">experimental</link> +interface and may change in the future.</para> + </note> + + <para> + The V4L2 flash controls are intended to provide generic access + to flash controller devices. Flash controller devices are + typically used in digital cameras. + </para> + + <para> + The interface can support both LED and xenon flash devices. As + of writing this, there is no xenon flash driver using this + interface. + </para> + + <section id="flash-controls-use-cases"> + <title>Supported use cases</title> + + <section> + <title>Unsynchronised LED flash (software strobe)</title> + + <para> + Unsynchronised LED flash is controlled directly by the + host as the sensor. The flash must be enabled by the host + before the exposure of the image starts and disabled once + it ends. The host is fully responsible for the timing of + the flash. + </para> + + <para>Example of such device: Nokia N900.</para> + </section> + + <section> + <title>Synchronised LED flash (hardware strobe)</title> + + <para> + The synchronised LED flash is pre-programmed by the host + (power and timeout) but controlled by the sensor through a + strobe signal from the sensor to the flash. + </para> + + <para> + The sensor controls the flash duration and timing. This + information typically must be made available to the + sensor. + </para> + + </section> + + <section> + <title>LED flash as torch</title> + + <para> + LED flash may be used as torch in conjunction with another + use case involving camera or individually. + </para> + + + <table pgwide="1" frame="none" id="flash-control-id"> + <title>Flash Control IDs</title> + + <tgroup cols="4"> + <colspec colname="c1" colwidth="1*" /> + <colspec colname="c2" colwidth="6*" /> + <colspec colname="c3" colwidth="2*" /> + <colspec colname="c4" colwidth="6*" /> + <spanspec namest="c1" nameend="c2" spanname="id" /> + <spanspec namest="c2" nameend="c4" spanname="descr" /> + <thead> + <row> + <entry spanname="id" align="left">ID</entry> + <entry align="left">Type</entry> + </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry> + </row> + </thead> + <tbody valign="top"> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_FLASH_CLASS</constant></entry> + <entry>class</entry> + </row> + <row> + <entry spanname="descr">The FLASH class descriptor.</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_FLASH_LED_MODE</constant></entry> + <entry>menu</entry> + </row> + <row id="v4l2-flash-led-mode"> + <entry spanname="descr">Defines the mode of the flash LED, + the high-power white LED attached to the flash controller. + Setting this control may not be possible in presence of + some faults. See V4L2_CID_FLASH_FAULT.</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_FLASH_LED_MODE_NONE</constant></entry> + <entry>Off.</entry> + </row> + <row> + <entry><constant>V4L2_FLASH_LED_MODE_FLASH</constant></entry> + <entry>Flash mode.</entry> + </row> + <row> + <entry><constant>V4L2_FLASH_LED_MODE_TORCH</constant></entry> + <entry>Torch mode. See V4L2_CID_FLASH_TORCH_INTENSITY.</entry> + </row> + </tbody> + </entrytbl> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_FLASH_STROBE_SOURCE</constant></entry> + <entry>menu</entry> + </row> + <row id="v4l2-flash-strobe-source"><entry + spanname="descr">Defines the source of the flash LED + strobe.</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_FLASH_STROBE_SOURCE_SOFTWARE</constant></entry> + <entry>The flash strobe is triggered by using + the V4L2_CID_FLASH_STROBE control.</entry> + </row> + <row> + <entry><constant>V4L2_FLASH_STROBE_SOURCE_EXTERNAL</constant></entry> + <entry>The flash strobe is triggered by an + external source. Typically this is a sensor, + which makes it possible to synchronises the + flash strobe start to exposure start.</entry> + </row> + </tbody> + </entrytbl> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_FLASH_STROBE</constant></entry> + <entry>button</entry> + </row> + <row> + <entry spanname="descr">Strobe flash. Valid when + V4L2_CID_FLASH_LED_MODE is set to + V4L2_FLASH_LED_MODE_FLASH and V4L2_CID_FLASH_STROBE_SOURCE + is set to V4L2_FLASH_STROBE_SOURCE_SOFTWARE. Setting this + control may not be possible in presence of some faults. + See V4L2_CID_FLASH_FAULT.</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_FLASH_STROBE_STOP</constant></entry> + <entry>button</entry> + </row> + <row><entry spanname="descr">Stop flash strobe immediately.</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_FLASH_STROBE_STATUS</constant></entry> + <entry>boolean</entry> + </row> + <row> + <entry spanname="descr">Strobe status: whether the flash + is strobing at the moment or not. This is a read-only + control.</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_FLASH_TIMEOUT</constant></entry> + <entry>integer</entry> + </row> + <row> + <entry spanname="descr">Hardware timeout for flash. The + flash strobe is stopped after this period of time has + passed from the start of the strobe.</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_FLASH_INTENSITY</constant></entry> + <entry>integer</entry> + </row> + <row> + <entry spanname="descr">Intensity of the flash strobe when + the flash LED is in flash mode + (V4L2_FLASH_LED_MODE_FLASH). The unit should be milliamps + (mA) if possible.</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_FLASH_TORCH_INTENSITY</constant></entry> + <entry>integer</entry> + </row> + <row> + <entry spanname="descr">Intensity of the flash LED in + torch mode (V4L2_FLASH_LED_MODE_TORCH). The unit should be + milliamps (mA) if possible. Setting this control may not + be possible in presence of some faults. See + V4L2_CID_FLASH_FAULT.</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_FLASH_INDICATOR_INTENSITY</constant></entry> + <entry>integer</entry> + </row> + <row> + <entry spanname="descr">Intensity of the indicator LED. + The indicator LED may be fully independent of the flash + LED. The unit should be microamps (uA) if possible.</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_FLASH_FAULT</constant></entry> + <entry>bitmask</entry> + </row> + <row> + <entry spanname="descr">Faults related to the flash. The + faults tell about specific problems in the flash chip + itself or the LEDs attached to it. Faults may prevent + further use of some of the flash controls. In particular, + V4L2_CID_FLASH_LED_MODE is set to V4L2_FLASH_LED_MODE_NONE + if the fault affects the flash LED. Exactly which faults + have such an effect is chip dependent. Reading the faults + resets the control and returns the chip to a usable state + if possible.</entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_FLASH_FAULT_OVER_VOLTAGE</constant></entry> + <entry>Flash controller voltage to the flash LED + has exceeded the limit specific to the flash + controller.</entry> + </row> + <row> + <entry><constant>V4L2_FLASH_FAULT_TIMEOUT</constant></entry> + <entry>The flash strobe was still on when + the timeout set by the user --- + V4L2_CID_FLASH_TIMEOUT control --- has expired. + Not all flash controllers may set this in all + such conditions.</entry> + </row> + <row> + <entry><constant>V4L2_FLASH_FAULT_OVER_TEMPERATURE</constant></entry> + <entry>The flash controller has overheated.</entry> + </row> + <row> + <entry><constant>V4L2_FLASH_FAULT_SHORT_CIRCUIT</constant></entry> + <entry>The short circuit protection of the flash + controller has been triggered.</entry> + </row> + <row> + <entry><constant>V4L2_FLASH_FAULT_OVER_CURRENT</constant></entry> + <entry>Current in the LED power supply has exceeded the limit + specific to the flash controller.</entry> + </row> + <row> + <entry><constant>V4L2_FLASH_FAULT_INDICATOR</constant></entry> + <entry>The flash controller has detected a short or open + circuit condition on the indicator LED.</entry> + </row> + <row> + <entry><constant>V4L2_FLASH_FAULT_UNDER_VOLTAGE</constant></entry> + <entry>Flash controller voltage to the flash LED + has been below the minimum limit specific to the flash + controller.</entry> + </row> + <row> + <entry><constant>V4L2_FLASH_FAULT_INPUT_VOLTAGE</constant></entry> + <entry>The input voltage of the flash controller is below + the limit under which strobing the flash at full current + will not be possible.The condition persists until this flag + is no longer set.</entry> + </row> + <row> + <entry><constant>V4L2_FLASH_FAULT_LED_OVER_TEMPERATURE</constant></entry> + <entry>The temperature of the LED has exceeded its + allowed upper limit.</entry> + </row> + </tbody> + </entrytbl> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_FLASH_CHARGE</constant></entry> + <entry>boolean</entry> + </row> + <row><entry spanname="descr">Enable or disable charging of the xenon + flash capacitor.</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_FLASH_READY</constant></entry> + <entry>boolean</entry> + </row> + <row> + <entry spanname="descr">Is the flash ready to strobe? + Xenon flashes require their capacitors charged before + strobing. LED flashes often require a cooldown period + after strobe during which another strobe will not be + possible. This is a read-only control.</entry> + </row> + <row><entry></entry></row> + </tbody> + </tgroup> + </table> + </section> + </section> + </section> + + <section id="jpeg-controls"> + <title>JPEG Control Reference</title> + <para>The JPEG class includes controls for common features of JPEG + encoders and decoders. Currently it includes features for codecs + implementing progressive baseline DCT compression process with + Huffman entrophy coding.</para> + <table pgwide="1" frame="none" id="jpeg-control-id"> + <title>JPEG Control IDs</title> + + <tgroup cols="4"> + <colspec colname="c1" colwidth="1*" /> + <colspec colname="c2" colwidth="6*" /> + <colspec colname="c3" colwidth="2*" /> + <colspec colname="c4" colwidth="6*" /> + <spanspec namest="c1" nameend="c2" spanname="id" /> + <spanspec namest="c2" nameend="c4" spanname="descr" /> + <thead> + <row> + <entry spanname="id" align="left">ID</entry> + <entry align="left">Type</entry> + </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry> + </row> + </thead> + <tbody valign="top"> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_JPEG_CLASS</constant> </entry> + <entry>class</entry> + </row><row><entry spanname="descr">The JPEG class descriptor. Calling + &VIDIOC-QUERYCTRL; for this control will return a description of this + control class. + + </entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_JPEG_CHROMA_SUBSAMPLING</constant></entry> + <entry>menu</entry> + </row> + <row id="v4l2-jpeg-chroma-subsampling"> + <entry spanname="descr">The chroma subsampling factors describe how + each component of an input image is sampled, in respect to maximum + sample rate in each spatial dimension. See <xref linkend="itu-t81"/>, + clause A.1.1. for more details. The <constant> + V4L2_CID_JPEG_CHROMA_SUBSAMPLING</constant> control determines how + Cb and Cr components are downsampled after coverting an input image + from RGB to Y'CbCr color space. + </entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_JPEG_CHROMA_SUBSAMPLING_444</constant> + </entry><entry>No chroma subsampling, each pixel has + Y, Cr and Cb values.</entry> + </row> + <row> + <entry><constant>V4L2_JPEG_CHROMA_SUBSAMPLING_422</constant> + </entry><entry>Horizontally subsample Cr, Cb components + by a factor of 2.</entry> + </row> + <row> + <entry><constant>V4L2_JPEG_CHROMA_SUBSAMPLING_420</constant> + </entry><entry>Subsample Cr, Cb components horizontally + and vertically by 2.</entry> + </row> + <row> + <entry><constant>V4L2_JPEG_CHROMA_SUBSAMPLING_411</constant> + </entry><entry>Horizontally subsample Cr, Cb components + by a factor of 4.</entry> + </row> + <row> + <entry><constant>V4L2_JPEG_CHROMA_SUBSAMPLING_410</constant> + </entry><entry>Subsample Cr, Cb components horizontally + by 4 and vertically by 2.</entry> + </row> + <row> + <entry><constant>V4L2_JPEG_CHROMA_SUBSAMPLING_GRAY</constant> + </entry><entry>Use only luminance component.</entry> + </row> + </tbody> + </entrytbl> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_JPEG_RESTART_INTERVAL</constant> + </entry><entry>integer</entry> + </row> + <row><entry spanname="descr"> + The restart interval determines an interval of inserting RSTm + markers (m = 0..7). The purpose of these markers is to additionally + reinitialize the encoder process, in order to process blocks of + an image independently. + For the lossy compression processes the restart interval unit is + MCU (Minimum Coded Unit) and its value is contained in DRI + (Define Restart Interval) marker. If <constant> + V4L2_CID_JPEG_RESTART_INTERVAL</constant> control is set to 0, + DRI and RSTm markers will not be inserted. + </entry> + </row> + <row id="jpeg-quality-control"> + <entry spanname="id"><constant>V4L2_CID_JPEG_COMPRESSION_QUALITY</constant></entry> + <entry>integer</entry> + </row> + <row> + <entry spanname="descr"> + <constant>V4L2_CID_JPEG_COMPRESSION_QUALITY</constant> control + determines trade-off between image quality and size. + It provides simpler method for applications to control image quality, + without a need for direct reconfiguration of luminance and chrominance + quantization tables. + + In cases where a driver uses quantization tables configured directly + by an application, using interfaces defined elsewhere, <constant> + V4L2_CID_JPEG_COMPRESSION_QUALITY</constant> control should be set + by driver to 0. + + <para>The value range of this control is driver-specific. Only + positive, non-zero values are meaningful. The recommended range + is 1 - 100, where larger values correspond to better image quality. + </para> + </entry> + </row> + <row id="jpeg-active-marker-control"> + <entry spanname="id"><constant>V4L2_CID_JPEG_ACTIVE_MARKER</constant></entry> + <entry>bitmask</entry> + </row> + <row> + <entry spanname="descr">Specify which JPEG markers are included + in compressed stream. This control is valid only for encoders. + </entry> + </row> + <row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_JPEG_ACTIVE_MARKER_APP0</constant></entry> + <entry>Application data segment APP<subscript>0</subscript>.</entry> + </row><row> + <entry><constant>V4L2_JPEG_ACTIVE_MARKER_APP1</constant></entry> + <entry>Application data segment APP<subscript>1</subscript>.</entry> + </row><row> + <entry><constant>V4L2_JPEG_ACTIVE_MARKER_COM</constant></entry> + <entry>Comment segment.</entry> + </row><row> + <entry><constant>V4L2_JPEG_ACTIVE_MARKER_DQT</constant></entry> + <entry>Quantization tables segment.</entry> + </row><row> + <entry><constant>V4L2_JPEG_ACTIVE_MARKER_DHT</constant></entry> + <entry>Huffman tables segment.</entry> + </row> + </tbody> + </entrytbl> + </row> + <row><entry></entry></row> + </tbody> + </tgroup> + </table> + <para>For more details about JPEG specification, refer + to <xref linkend="itu-t81"/>, <xref linkend="jfif"/>, + <xref linkend="w3c-jpeg-jfif"/>.</para> + </section> + + <section id="image-source-controls"> + <title>Image Source Control Reference</title> + + <note> + <title>Experimental</title> + + <para>This is an <link + linkend="experimental">experimental</link> interface and may + change in the future.</para> + </note> + + <para> + The Image Source control class is intended for low-level + control of image source devices such as image sensors. The + devices feature an analogue to digital converter and a bus + transmitter to transmit the image data out of the device. + </para> + + <table pgwide="1" frame="none" id="image-source-control-id"> + <title>Image Source Control IDs</title> + + <tgroup cols="4"> + <colspec colname="c1" colwidth="1*" /> + <colspec colname="c2" colwidth="6*" /> + <colspec colname="c3" colwidth="2*" /> + <colspec colname="c4" colwidth="6*" /> + <spanspec namest="c1" nameend="c2" spanname="id" /> + <spanspec namest="c2" nameend="c4" spanname="descr" /> + <thead> + <row> + <entry spanname="id" align="left">ID</entry> + <entry align="left">Type</entry> + </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry> + </row> + </thead> + <tbody valign="top"> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_IMAGE_SOURCE_CLASS</constant></entry> + <entry>class</entry> + </row> + <row> + <entry spanname="descr">The IMAGE_SOURCE class descriptor.</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_VBLANK</constant></entry> + <entry>integer</entry> + </row> + <row> + <entry spanname="descr">Vertical blanking. The idle period + after every frame during which no image data is produced. + The unit of vertical blanking is a line. Every line has + length of the image width plus horizontal blanking at the + pixel rate defined by + <constant>V4L2_CID_PIXEL_RATE</constant> control in the + same sub-device.</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_HBLANK</constant></entry> + <entry>integer</entry> + </row> + <row> + <entry spanname="descr">Horizontal blanking. The idle + period after every line of image data during which no + image data is produced. The unit of horizontal blanking is + pixels.</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_ANALOGUE_GAIN</constant></entry> + <entry>integer</entry> + </row> + <row> + <entry spanname="descr">Analogue gain is gain affecting + all colour components in the pixel matrix. The gain + operation is performed in the analogue domain before A/D + conversion. + </entry> + </row> + <row><entry></entry></row> + </tbody> + </tgroup> + </table> + + </section> + + <section id="image-process-controls"> + <title>Image Process Control Reference</title> + + <note> + <title>Experimental</title> + + <para>This is an <link + linkend="experimental">experimental</link> interface and may + change in the future.</para> + </note> + + <para> + The Image Source control class is intended for low-level control of + image processing functions. Unlike + <constant>V4L2_CID_IMAGE_SOURCE_CLASS</constant>, the controls in + this class affect processing the image, and do not control capturing + of it. + </para> + + <table pgwide="1" frame="none" id="image-process-control-id"> + <title>Image Source Control IDs</title> + + <tgroup cols="4"> + <colspec colname="c1" colwidth="1*" /> + <colspec colname="c2" colwidth="6*" /> + <colspec colname="c3" colwidth="2*" /> + <colspec colname="c4" colwidth="6*" /> + <spanspec namest="c1" nameend="c2" spanname="id" /> + <spanspec namest="c2" nameend="c4" spanname="descr" /> + <thead> + <row> + <entry spanname="id" align="left">ID</entry> + <entry align="left">Type</entry> + </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry> + </row> + </thead> + <tbody valign="top"> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_IMAGE_PROC_CLASS</constant></entry> + <entry>class</entry> + </row> + <row> + <entry spanname="descr">The IMAGE_PROC class descriptor.</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_LINK_FREQ</constant></entry> + <entry>integer menu</entry> + </row> + <row> + <entry spanname="descr">Data bus frequency. Together with the + media bus pixel code, bus type (clock cycles per sample), the + data bus frequency defines the pixel rate + (<constant>V4L2_CID_PIXEL_RATE</constant>) in the + pixel array (or possibly elsewhere, if the device is not an + image sensor). The frame rate can be calculated from the pixel + clock, image width and height and horizontal and vertical + blanking. While the pixel rate control may be defined elsewhere + than in the subdev containing the pixel array, the frame rate + cannot be obtained from that information. This is because only + on the pixel array it can be assumed that the vertical and + horizontal blanking information is exact: no other blanking is + allowed in the pixel array. The selection of frame rate is + performed by selecting the desired horizontal and vertical + blanking. The unit of this control is Hz. </entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_PIXEL_RATE</constant></entry> + <entry>64-bit integer</entry> + </row> + <row> + <entry spanname="descr">Pixel rate in the source pads of + the subdev. This control is read-only and its unit is + pixels / second. + </entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_TEST_PATTERN</constant></entry> + <entry>menu</entry> + </row> + <row id="v4l2-test-pattern"> + <entry spanname="descr"> Some capture/display/sensor devices have + the capability to generate test pattern images. These hardware + specific test patterns can be used to test if a device is working + properly.</entry> + </row> + <row><entry></entry></row> + </tbody> + </tgroup> + </table> + + </section> + + <section id="dv-controls"> + <title>Digital Video Control Reference</title> + + <note> + <title>Experimental</title> + + <para>This is an <link + linkend="experimental">experimental</link> interface and may + change in the future.</para> + </note> + + <para> + The Digital Video control class is intended to control receivers + and transmitters for <ulink url="http://en.wikipedia.org/wiki/Vga">VGA</ulink>, + <ulink url="http://en.wikipedia.org/wiki/Digital_Visual_Interface">DVI</ulink> + (Digital Visual Interface), HDMI (<xref linkend="hdmi" />) and DisplayPort (<xref linkend="dp" />). + These controls are generally expected to be private to the receiver or transmitter + subdevice that implements them, so they are only exposed on the + <filename>/dev/v4l-subdev*</filename> device node. + </para> + + <para>Note that these devices can have multiple input or output pads which are + hooked up to e.g. HDMI connectors. Even though the subdevice will receive or + transmit video from/to only one of those pads, the other pads can still be + active when it comes to EDID (Extended Display Identification Data, + <xref linkend="vesaedid" />) and HDCP (High-bandwidth Digital Content + Protection System, <xref linkend="hdcp" />) processing, allowing the device + to do the fairly slow EDID/HDCP handling in advance. This allows for quick + switching between connectors.</para> + + <para>These pads appear in several of the controls in this section as + bitmasks, one bit for each pad. Bit 0 corresponds to pad 0, bit 1 to pad 1, + etc. The maximum value of the control is the set of valid pads.</para> + + <table pgwide="1" frame="none" id="dv-control-id"> + <title>Digital Video Control IDs</title> + + <tgroup cols="4"> + <colspec colname="c1" colwidth="1*" /> + <colspec colname="c2" colwidth="6*" /> + <colspec colname="c3" colwidth="2*" /> + <colspec colname="c4" colwidth="6*" /> + <spanspec namest="c1" nameend="c2" spanname="id" /> + <spanspec namest="c2" nameend="c4" spanname="descr" /> + <thead> + <row> + <entry spanname="id" align="left">ID</entry> + <entry align="left">Type</entry> + </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry> + </row> + </thead> + <tbody valign="top"> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_DV_CLASS</constant></entry> + <entry>class</entry> + </row> + <row> + <entry spanname="descr">The Digital Video class descriptor.</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_DV_TX_HOTPLUG</constant></entry> + <entry>bitmask</entry> + </row> + <row> + <entry spanname="descr">Many connectors have a hotplug pin which is high + if EDID information is available from the source. This control shows the + state of the hotplug pin as seen by the transmitter. + Each bit corresponds to an output pad on the transmitter. If an output pad + does not have an associated hotplug pin, then the bit for that pad will be 0. + This read-only control is applicable to DVI-D, HDMI and DisplayPort connectors. + </entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_DV_TX_RXSENSE</constant></entry> + <entry>bitmask</entry> + </row> + <row> + <entry spanname="descr">Rx Sense is the detection of pull-ups on the TMDS + clock lines. This normally means that the sink has left/entered standby (i.e. + the transmitter can sense that the receiver is ready to receive video). + Each bit corresponds to an output pad on the transmitter. If an output pad + does not have an associated Rx Sense, then the bit for that pad will be 0. + This read-only control is applicable to DVI-D and HDMI devices. + </entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_DV_TX_EDID_PRESENT</constant></entry> + <entry>bitmask</entry> + </row> + <row> + <entry spanname="descr">When the transmitter sees the hotplug signal from the + receiver it will attempt to read the EDID. If set, then the transmitter has read + at least the first block (= 128 bytes). + Each bit corresponds to an output pad on the transmitter. If an output pad + does not support EDIDs, then the bit for that pad will be 0. + This read-only control is applicable to VGA, DVI-A/D, HDMI and DisplayPort connectors. + </entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_DV_TX_MODE</constant></entry> + <entry id="v4l2-dv-tx-mode">enum v4l2_dv_tx_mode</entry> + </row> + <row> + <entry spanname="descr">HDMI transmitters can transmit in DVI-D mode (just video) + or in HDMI mode (video + audio + auxiliary data). This control selects which mode + to use: V4L2_DV_TX_MODE_DVI_D or V4L2_DV_TX_MODE_HDMI. + This control is applicable to HDMI connectors. + </entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_DV_TX_RGB_RANGE</constant></entry> + <entry id="v4l2-dv-rgb-range">enum v4l2_dv_rgb_range</entry> + </row> + <row> + <entry spanname="descr">Select the quantization range for RGB output. V4L2_DV_RANGE_AUTO + follows the RGB quantization range specified in the standard for the video interface + (ie. <xref linkend="cea861" /> for HDMI). V4L2_DV_RANGE_LIMITED and V4L2_DV_RANGE_FULL override the standard + to be compatible with sinks that have not implemented the standard correctly + (unfortunately quite common for HDMI and DVI-D). Full range allows all possible values to be + used whereas limited range sets the range to (16 << (N-8)) - (235 << (N-8)) + where N is the number of bits per component. + This control is applicable to VGA, DVI-A/D, HDMI and DisplayPort connectors. + </entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_DV_RX_POWER_PRESENT</constant></entry> + <entry>bitmask</entry> + </row> + <row> + <entry spanname="descr">Detects whether the receiver receives power from the source + (e.g. HDMI carries 5V on one of the pins). This is often used to power an eeprom + which contains EDID information, such that the source can read the EDID even if + the sink is in standby/power off. + Each bit corresponds to an input pad on the transmitter. If an input pad + cannot detect whether power is present, then the bit for that pad will be 0. + This read-only control is applicable to DVI-D, HDMI and DisplayPort connectors. + </entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_DV_RX_RGB_RANGE</constant></entry> + <entry>enum v4l2_dv_rgb_range</entry> + </row> + <row> + <entry spanname="descr">Select the quantization range for RGB input. V4L2_DV_RANGE_AUTO + follows the RGB quantization range specified in the standard for the video interface + (ie. <xref linkend="cea861" /> for HDMI). V4L2_DV_RANGE_LIMITED and V4L2_DV_RANGE_FULL override the standard + to be compatible with sources that have not implemented the standard correctly + (unfortunately quite common for HDMI and DVI-D). Full range allows all possible values to be + used whereas limited range sets the range to (16 << (N-8)) - (235 << (N-8)) + where N is the number of bits per component. + This control is applicable to VGA, DVI-A/D, HDMI and DisplayPort connectors. + </entry> + </row> + <row><entry></entry></row> + </tbody> + </tgroup> + </table> + + </section> + + <section id="fm-rx-controls"> + <title>FM Receiver Control Reference</title> + + <para>The FM Receiver (FM_RX) class includes controls for common features of + FM Reception capable devices.</para> + + <table pgwide="1" frame="none" id="fm-rx-control-id"> + <title>FM_RX Control IDs</title> + + <tgroup cols="4"> + <colspec colname="c1" colwidth="1*" /> + <colspec colname="c2" colwidth="6*" /> + <colspec colname="c3" colwidth="2*" /> + <colspec colname="c4" colwidth="6*" /> + <spanspec namest="c1" nameend="c2" spanname="id" /> + <spanspec namest="c2" nameend="c4" spanname="descr" /> + <thead> + <row> + <entry spanname="id" align="left">ID</entry> + <entry align="left">Type</entry> + </row><row rowsep="1"><entry spanname="descr" align="left">Description</entry> + </row> + </thead> + <tbody valign="top"> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_FM_RX_CLASS</constant> </entry> + <entry>class</entry> + </row><row><entry spanname="descr">The FM_RX class +descriptor. Calling &VIDIOC-QUERYCTRL; for this control will return a +description of this control class.</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_RDS_RECEPTION</constant> </entry> + <entry>boolean</entry> + </row><row><entry spanname="descr">Enables/disables RDS + reception by the radio tuner</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_TUNE_DEEMPHASIS</constant> </entry> + <entry>enum v4l2_deemphasis</entry> + </row> + <row id="v4l2-deemphasis"><entry spanname="descr">Configures the de-emphasis value for reception. +A de-emphasis filter is applied to the broadcast to accentuate the high audio frequencies. +Depending on the region, a time constant of either 50 or 75 useconds is used. The enum v4l2_deemphasis +defines possible values for de-emphasis. Here they are:</entry> + </row><row> + <entrytbl spanname="descr" cols="2"> + <tbody valign="top"> + <row> + <entry><constant>V4L2_DEEMPHASIS_DISABLED</constant> </entry> + <entry>No de-emphasis is applied.</entry> + </row> + <row> + <entry><constant>V4L2_DEEMPHASIS_50_uS</constant> </entry> + <entry>A de-emphasis of 50 uS is used.</entry> + </row> + <row> + <entry><constant>V4L2_DEEMPHASIS_75_uS</constant> </entry> + <entry>A de-emphasis of 75 uS is used.</entry> + </row> + </tbody> + </entrytbl> + + </row> + <row><entry></entry></row> + </tbody> + </tgroup> + </table> + + </section> + + <section id="rf-tuner-controls"> + <title>RF Tuner Control Reference</title> + + <para> +The RF Tuner (RF_TUNER) class includes controls for common features of devices +having RF tuner. + </para> + <para> +In this context, RF tuner is radio receiver circuit between antenna and +demodulator. It receives radio frequency (RF) from the antenna and converts that +received signal to lower intermediate frequency (IF) or baseband frequency (BB). +Tuners that could do baseband output are often called Zero-IF tuners. Older +tuners were typically simple PLL tuners inside a metal box, whilst newer ones +are highly integrated chips without a metal box "silicon tuners". These controls +are mostly applicable for new feature rich silicon tuners, just because older +tuners does not have much adjustable features. + </para> + <para> +For more information about RF tuners see +<ulink url="http://en.wikipedia.org/wiki/Tuner_%28radio%29">Tuner (radio)</ulink> +and +<ulink url="http://en.wikipedia.org/wiki/RF_front_end">RF front end</ulink> +from Wikipedia. + </para> + + <table pgwide="1" frame="none" id="rf-tuner-control-id"> + <title>RF_TUNER Control IDs</title> + + <tgroup cols="4"> + <colspec colname="c1" colwidth="1*" /> + <colspec colname="c2" colwidth="6*" /> + <colspec colname="c3" colwidth="2*" /> + <colspec colname="c4" colwidth="6*" /> + <spanspec namest="c1" nameend="c2" spanname="id" /> + <spanspec namest="c2" nameend="c4" spanname="descr" /> + <thead> + <row> + <entry spanname="id" align="left">ID</entry> + <entry align="left">Type</entry> + </row> + <row rowsep="1"> + <entry spanname="descr" align="left">Description</entry> + </row> + </thead> + <tbody valign="top"> + <row><entry></entry></row> + <row> + <entry spanname="id"><constant>V4L2_CID_RF_TUNER_CLASS</constant> </entry> + <entry>class</entry> + </row><row><entry spanname="descr">The RF_TUNER class +descriptor. Calling &VIDIOC-QUERYCTRL; for this control will return a +description of this control class.</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_RF_TUNER_BANDWIDTH_AUTO</constant> </entry> + <entry>boolean</entry> + </row> + <row> + <entry spanname="descr">Enables/disables tuner radio channel +bandwidth configuration. In automatic mode bandwidth configuration is performed +by the driver.</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_RF_TUNER_BANDWIDTH</constant> </entry> + <entry>integer</entry> + </row> + <row> + <entry spanname="descr">Filter(s) on tuner signal path are used to +filter signal according to receiving party needs. Driver configures filters to +fulfill desired bandwidth requirement. Used when V4L2_CID_RF_TUNER_BANDWIDTH_AUTO is not +set. Unit is in Hz. The range and step are driver-specific.</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_RF_TUNER_LNA_GAIN_AUTO</constant> </entry> + <entry>boolean</entry> + </row> + <row> + <entry spanname="descr">Enables/disables LNA automatic gain control (AGC)</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO</constant> </entry> + <entry>boolean</entry> + </row> + <row> + <entry spanname="descr">Enables/disables mixer automatic gain control (AGC)</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_RF_TUNER_IF_GAIN_AUTO</constant> </entry> + <entry>boolean</entry> + </row> + <row> + <entry spanname="descr">Enables/disables IF automatic gain control (AGC)</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_RF_TUNER_LNA_GAIN</constant> </entry> + <entry>integer</entry> + </row> + <row> + <entry spanname="descr">LNA (low noise amplifier) gain is first +gain stage on the RF tuner signal path. It is located very close to tuner +antenna input. Used when <constant>V4L2_CID_RF_TUNER_LNA_GAIN_AUTO</constant> is not set. +The range and step are driver-specific.</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_RF_TUNER_MIXER_GAIN</constant> </entry> + <entry>integer</entry> + </row> + <row> + <entry spanname="descr">Mixer gain is second gain stage on the RF +tuner signal path. It is located inside mixer block, where RF signal is +down-converted by the mixer. Used when <constant>V4L2_CID_RF_TUNER_MIXER_GAIN_AUTO</constant> +is not set. The range and step are driver-specific.</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_RF_TUNER_IF_GAIN</constant> </entry> + <entry>integer</entry> + </row> + <row> + <entry spanname="descr">IF gain is last gain stage on the RF tuner +signal path. It is located on output of RF tuner. It controls signal level of +intermediate frequency output or baseband output. Used when +<constant>V4L2_CID_RF_TUNER_IF_GAIN_AUTO</constant> is not set. The range and step are +driver-specific.</entry> + </row> + <row> + <entry spanname="id"><constant>V4L2_CID_RF_TUNER_PLL_LOCK</constant> </entry> + <entry>boolean</entry> + </row> + <row> + <entry spanname="descr">Is synthesizer PLL locked? RF tuner is +receiving given frequency when that control is set. This is a read-only control. +</entry> + </row> + </tbody> + </tgroup> + </table> + </section> +</section> diff --git a/Documentation/DocBook/media/v4l/crop.pdf b/Documentation/DocBook/media/v4l/crop.pdf Binary files differnew file mode 100644 index 00000000000..c9fb81cd32f --- /dev/null +++ b/Documentation/DocBook/media/v4l/crop.pdf diff --git a/Documentation/DocBook/media/v4l/dev-capture.xml b/Documentation/DocBook/media/v4l/dev-capture.xml new file mode 100644 index 00000000000..e1c5f9406d6 --- /dev/null +++ b/Documentation/DocBook/media/v4l/dev-capture.xml @@ -0,0 +1,110 @@ + <title>Video Capture Interface</title> + + <para>Video capture devices sample an analog video signal and store +the digitized images in memory. Today nearly all devices can capture +at full 25 or 30 frames/second. With this interface applications can +control the capture process and move images from the driver into user +space.</para> + + <para>Conventionally V4L2 video capture devices are accessed through +character device special files named <filename>/dev/video</filename> +and <filename>/dev/video0</filename> to +<filename>/dev/video63</filename> with major number 81 and minor +numbers 0 to 63. <filename>/dev/video</filename> is typically a +symbolic link to the preferred video device. Note the same device +files are used for video output devices.</para> + + <section> + <title>Querying Capabilities</title> + + <para>Devices supporting the video capture interface set the +<constant>V4L2_CAP_VIDEO_CAPTURE</constant> or +<constant>V4L2_CAP_VIDEO_CAPTURE_MPLANE</constant> flag in the +<structfield>capabilities</structfield> field of &v4l2-capability; +returned by the &VIDIOC-QUERYCAP; ioctl. As secondary device functions +they may also support the <link linkend="overlay">video overlay</link> +(<constant>V4L2_CAP_VIDEO_OVERLAY</constant>) and the <link +linkend="raw-vbi">raw VBI capture</link> +(<constant>V4L2_CAP_VBI_CAPTURE</constant>) interface. At least one of +the read/write or streaming I/O methods must be supported. Tuners and +audio inputs are optional.</para> + </section> + + <section> + <title>Supplemental Functions</title> + + <para>Video capture devices shall support <link +linkend="audio">audio input</link>, <link +linkend="tuner">tuner</link>, <link linkend="control">controls</link>, +<link linkend="crop">cropping and scaling</link> and <link +linkend="streaming-par">streaming parameter</link> ioctls as needed. +The <link linkend="video">video input</link> and <link +linkend="standard">video standard</link> ioctls must be supported by +all video capture devices.</para> + </section> + + <section> + <title>Image Format Negotiation</title> + + <para>The result of a capture operation is determined by +cropping and image format parameters. The former select an area of the +video picture to capture, the latter how images are stored in memory, +&ie; in RGB or YUV format, the number of bits per pixel or width and +height. Together they also define how images are scaled in the +process.</para> + + <para>As usual these parameters are <emphasis>not</emphasis> reset +at &func-open; time to permit Unix tool chains, programming a device +and then reading from it as if it was a plain file. Well written V4L2 +applications ensure they really get what they want, including cropping +and scaling.</para> + + <para>Cropping initialization at minimum requires to reset the +parameters to defaults. An example is given in <xref +linkend="crop" />.</para> + + <para>To query the current image format applications set the +<structfield>type</structfield> field of a &v4l2-format; to +<constant>V4L2_BUF_TYPE_VIDEO_CAPTURE</constant> or +<constant>V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE</constant> and call the +&VIDIOC-G-FMT; ioctl with a pointer to this structure. Drivers fill +the &v4l2-pix-format; <structfield>pix</structfield> or the +&v4l2-pix-format-mplane; <structfield>pix_mp</structfield> member of the +<structfield>fmt</structfield> union.</para> + + <para>To request different parameters applications set the +<structfield>type</structfield> field of a &v4l2-format; as above and +initialize all fields of the &v4l2-pix-format; +<structfield>vbi</structfield> member of the +<structfield>fmt</structfield> union, or better just modify the +results of <constant>VIDIOC_G_FMT</constant>, and call the +&VIDIOC-S-FMT; ioctl with a pointer to this structure. Drivers may +adjust the parameters and finally return the actual parameters as +<constant>VIDIOC_G_FMT</constant> does.</para> + + <para>Like <constant>VIDIOC_S_FMT</constant> the +&VIDIOC-TRY-FMT; ioctl can be used to learn about hardware limitations +without disabling I/O or possibly time consuming hardware +preparations.</para> + + <para>The contents of &v4l2-pix-format; and &v4l2-pix-format-mplane; +are discussed in <xref linkend="pixfmt" />. See also the specification of the +<constant>VIDIOC_G_FMT</constant>, <constant>VIDIOC_S_FMT</constant> +and <constant>VIDIOC_TRY_FMT</constant> ioctls for details. Video +capture devices must implement both the +<constant>VIDIOC_G_FMT</constant> and +<constant>VIDIOC_S_FMT</constant> ioctl, even if +<constant>VIDIOC_S_FMT</constant> ignores all requests and always +returns default parameters as <constant>VIDIOC_G_FMT</constant> does. +<constant>VIDIOC_TRY_FMT</constant> is optional.</para> + </section> + + <section> + <title>Reading Images</title> + + <para>A video capture device may support the <link +linkend="rw">read() function</link> and/or streaming (<link +linkend="mmap">memory mapping</link> or <link +linkend="userp">user pointer</link>) I/O. See <xref +linkend="io" /> for details.</para> + </section> diff --git a/Documentation/DocBook/media/v4l/dev-codec.xml b/Documentation/DocBook/media/v4l/dev-codec.xml new file mode 100644 index 00000000000..ff44c16fc08 --- /dev/null +++ b/Documentation/DocBook/media/v4l/dev-codec.xml @@ -0,0 +1,27 @@ + <title>Codec Interface</title> + + <para>A V4L2 codec can compress, decompress, transform, or otherwise +convert video data from one format into another format, in memory. Typically +such devices are memory-to-memory devices (i.e. devices with the +<constant>V4L2_CAP_VIDEO_M2M</constant> or <constant>V4L2_CAP_VIDEO_M2M_MPLANE</constant> +capability set). +</para> + + <para>A memory-to-memory video node acts just like a normal video node, but it +supports both output (sending frames from memory to the codec hardware) and +capture (receiving the processed frames from the codec hardware into memory) +stream I/O. An application will have to setup the stream +I/O for both sides and finally call &VIDIOC-STREAMON; for both capture and output +to start the codec.</para> + + <para>Video compression codecs use the MPEG controls to setup their codec parameters +(note that the MPEG controls actually support many more codecs than just MPEG). +See <xref linkend="mpeg-controls"></xref>.</para> + + <para>Memory-to-memory devices can often be used as a shared resource: you can +open the video node multiple times, each application setting up their own codec properties +that are local to the file handle, and each can use it independently from the others. +The driver will arbitrate access to the codec and reprogram it whenever another file +handler gets access. This is different from the usual video node behavior where the video properties +are global to the device (i.e. changing something through one file handle is visible +through another file handle).</para> diff --git a/Documentation/DocBook/media/v4l/dev-effect.xml b/Documentation/DocBook/media/v4l/dev-effect.xml new file mode 100644 index 00000000000..2350a67c071 --- /dev/null +++ b/Documentation/DocBook/media/v4l/dev-effect.xml @@ -0,0 +1,17 @@ + <title>Effect Devices Interface</title> + + <note> + <title>Suspended</title> + + <para>This interface has been be suspended from the V4L2 API +implemented in Linux 2.6 until we have more experience with effect +device interfaces.</para> + </note> + + <para>A V4L2 video effect device can do image effects, filtering, or +combine two or more images or image streams. For example video +transitions or wipes. Applications send data to be processed and +receive the result data either with &func-read; and &func-write; +functions, or through the streaming I/O mechanism.</para> + + <para>[to do]</para> diff --git a/Documentation/DocBook/media/v4l/dev-event.xml b/Documentation/DocBook/media/v4l/dev-event.xml new file mode 100644 index 00000000000..19f4becfae3 --- /dev/null +++ b/Documentation/DocBook/media/v4l/dev-event.xml @@ -0,0 +1,43 @@ + <title>Event Interface</title> + + <para>The V4L2 event interface provides a means for a user to get + immediately notified on certain conditions taking place on a device. + This might include start of frame or loss of signal events, for + example. Changes in the value or state of a V4L2 control can also be + reported through events. + </para> + + <para>To receive events, the events the user is interested in first must + be subscribed using the &VIDIOC-SUBSCRIBE-EVENT; ioctl. Once an event is + subscribed, the events of subscribed types are dequeueable using the + &VIDIOC-DQEVENT; ioctl. Events may be unsubscribed using + VIDIOC_UNSUBSCRIBE_EVENT ioctl. The special event type V4L2_EVENT_ALL may + be used to unsubscribe all the events the driver supports.</para> + + <para>The event subscriptions and event queues are specific to file + handles. Subscribing an event on one file handle does not affect + other file handles.</para> + + <para>The information on dequeueable events is obtained by using select or + poll system calls on video devices. The V4L2 events use POLLPRI events on + poll system call and exceptions on select system call.</para> + + <para>Starting with kernel 3.1 certain guarantees can be given with + regards to events:<orderedlist> + <listitem> + <para>Each subscribed event has its own internal dedicated event queue. +This means that flooding of one event type will not interfere with other +event types.</para> + </listitem> + <listitem> + <para>If the internal event queue for a particular subscribed event +becomes full, then the oldest event in that queue will be dropped.</para> + </listitem> + <listitem> + <para>Where applicable, certain event types can ensure that the payload +of the oldest event that is about to be dropped will be merged with the payload +of the next oldest event. Thus ensuring that no information is lost, but only an +intermediate step leading up to that information. See the documentation for the +event you want to subscribe to whether this is applicable for that event or not.</para> + </listitem> + </orderedlist></para> diff --git a/Documentation/DocBook/media/v4l/dev-osd.xml b/Documentation/DocBook/media/v4l/dev-osd.xml new file mode 100644 index 00000000000..54853329140 --- /dev/null +++ b/Documentation/DocBook/media/v4l/dev-osd.xml @@ -0,0 +1,149 @@ + <title>Video Output Overlay Interface</title> + <subtitle>Also known as On-Screen Display (OSD)</subtitle> + + <para>Some video output devices can overlay a framebuffer image onto +the outgoing video signal. Applications can set up such an overlay +using this interface, which borrows structures and ioctls of the <link +linkend="overlay">Video Overlay</link> interface.</para> + + <para>The OSD function is accessible through the same character +special file as the <link linkend="capture">Video Output</link> function. +Note the default function of such a <filename>/dev/video</filename> device +is video capturing or output. The OSD function is only available after +calling the &VIDIOC-S-FMT; ioctl.</para> + + <section> + <title>Querying Capabilities</title> + + <para>Devices supporting the <wordasword>Video Output +Overlay</wordasword> interface set the +<constant>V4L2_CAP_VIDEO_OUTPUT_OVERLAY</constant> flag in the +<structfield>capabilities</structfield> field of &v4l2-capability; +returned by the &VIDIOC-QUERYCAP; ioctl.</para> + </section> + + <section> + <title>Framebuffer</title> + + <para>Contrary to the <wordasword>Video Overlay</wordasword> +interface the framebuffer is normally implemented on the TV card and +not the graphics card. On Linux it is accessible as a framebuffer +device (<filename>/dev/fbN</filename>). Given a V4L2 device, +applications can find the corresponding framebuffer device by calling +the &VIDIOC-G-FBUF; ioctl. It returns, amongst other information, the +physical address of the framebuffer in the +<structfield>base</structfield> field of &v4l2-framebuffer;. The +framebuffer device ioctl <constant>FBIOGET_FSCREENINFO</constant> +returns the same address in the <structfield>smem_start</structfield> +field of struct <structname>fb_fix_screeninfo</structname>. The +<constant>FBIOGET_FSCREENINFO</constant> ioctl and struct +<structname>fb_fix_screeninfo</structname> are defined in the +<filename>linux/fb.h</filename> header file.</para> + + <para>The width and height of the framebuffer depends on the +current video standard. A V4L2 driver may reject attempts to change +the video standard (or any other ioctl which would imply a framebuffer +size change) with an &EBUSY; until all applications closed the +framebuffer device.</para> + + <example> + <title>Finding a framebuffer device for OSD</title> + + <programlisting> +#include <linux/fb.h> + +&v4l2-framebuffer; fbuf; +unsigned int i; +int fb_fd; + +if (-1 == ioctl(fd, VIDIOC_G_FBUF, &fbuf)) { + perror("VIDIOC_G_FBUF"); + exit(EXIT_FAILURE); +} + +for (i = 0; i < 30; i++) { + char dev_name[16]; + struct fb_fix_screeninfo si; + + snprintf(dev_name, sizeof(dev_name), "/dev/fb%u", i); + + fb_fd = open(dev_name, O_RDWR); + if (-1 == fb_fd) { + switch (errno) { + case ENOENT: /* no such file */ + case ENXIO: /* no driver */ + continue; + + default: + perror("open"); + exit(EXIT_FAILURE); + } + } + + if (0 == ioctl(fb_fd, FBIOGET_FSCREENINFO, &si)) { + if (si.smem_start == (unsigned long)fbuf.base) + break; + } else { + /* Apparently not a framebuffer device. */ + } + + close(fb_fd); + fb_fd = -1; +} + +/* fb_fd is the file descriptor of the framebuffer device + for the video output overlay, or -1 if no device was found. */ +</programlisting> + </example> + </section> + + <section> + <title>Overlay Window and Scaling</title> + + <para>The overlay is controlled by source and target rectangles. +The source rectangle selects a subsection of the framebuffer image to +be overlaid, the target rectangle an area in the outgoing video signal +where the image will appear. Drivers may or may not support scaling, +and arbitrary sizes and positions of these rectangles. Further drivers +may support any (or none) of the clipping/blending methods defined for +the <link linkend="overlay">Video Overlay</link> interface.</para> + + <para>A &v4l2-window; defines the size of the source rectangle, +its position in the framebuffer and the clipping/blending method to be +used for the overlay. To get the current parameters applications set +the <structfield>type</structfield> field of a &v4l2-format; to +<constant>V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY</constant> and call the +&VIDIOC-G-FMT; ioctl. The driver fills the +<structname>v4l2_window</structname> substructure named +<structfield>win</structfield>. It is not possible to retrieve a +previously programmed clipping list or bitmap.</para> + + <para>To program the source rectangle applications set the +<structfield>type</structfield> field of a &v4l2-format; to +<constant>V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY</constant>, initialize +the <structfield>win</structfield> substructure and call the +&VIDIOC-S-FMT; ioctl. The driver adjusts the parameters against +hardware limits and returns the actual parameters as +<constant>VIDIOC_G_FMT</constant> does. Like +<constant>VIDIOC_S_FMT</constant>, the &VIDIOC-TRY-FMT; ioctl can be +used to learn about driver capabilities without actually changing +driver state. Unlike <constant>VIDIOC_S_FMT</constant> this also works +after the overlay has been enabled.</para> + + <para>A &v4l2-crop; defines the size and position of the target +rectangle. The scaling factor of the overlay is implied by the width +and height given in &v4l2-window; and &v4l2-crop;. The cropping API +applies to <wordasword>Video Output</wordasword> and <wordasword>Video +Output Overlay</wordasword> devices in the same way as to +<wordasword>Video Capture</wordasword> and <wordasword>Video +Overlay</wordasword> devices, merely reversing the direction of the +data flow. For more information see <xref linkend="crop" />.</para> + </section> + + <section> + <title>Enabling Overlay</title> + + <para>There is no V4L2 ioctl to enable or disable the overlay, +however the framebuffer interface of the driver may support the +<constant>FBIOBLANK</constant> ioctl.</para> + </section> diff --git a/Documentation/DocBook/media/v4l/dev-output.xml b/Documentation/DocBook/media/v4l/dev-output.xml new file mode 100644 index 00000000000..9130a3dc788 --- /dev/null +++ b/Documentation/DocBook/media/v4l/dev-output.xml @@ -0,0 +1,106 @@ + <title>Video Output Interface</title> + + <para>Video output devices encode stills or image sequences as +analog video signal. With this interface applications can +control the encoding process and move images from user space to +the driver.</para> + + <para>Conventionally V4L2 video output devices are accessed through +character device special files named <filename>/dev/video</filename> +and <filename>/dev/video0</filename> to +<filename>/dev/video63</filename> with major number 81 and minor +numbers 0 to 63. <filename>/dev/video</filename> is typically a +symbolic link to the preferred video device. Note the same device +files are used for video capture devices.</para> + + <section> + <title>Querying Capabilities</title> + + <para>Devices supporting the video output interface set the +<constant>V4L2_CAP_VIDEO_OUTPUT</constant> or +<constant>V4L2_CAP_VIDEO_OUTPUT_MPLANE</constant> flag in the +<structfield>capabilities</structfield> field of &v4l2-capability; +returned by the &VIDIOC-QUERYCAP; ioctl. As secondary device functions +they may also support the <link linkend="raw-vbi">raw VBI +output</link> (<constant>V4L2_CAP_VBI_OUTPUT</constant>) interface. At +least one of the read/write or streaming I/O methods must be +supported. Modulators and audio outputs are optional.</para> + </section> + + <section> + <title>Supplemental Functions</title> + + <para>Video output devices shall support <link +linkend="audio">audio output</link>, <link +linkend="tuner">modulator</link>, <link linkend="control">controls</link>, +<link linkend="crop">cropping and scaling</link> and <link +linkend="streaming-par">streaming parameter</link> ioctls as needed. +The <link linkend="video">video output</link> and <link +linkend="standard">video standard</link> ioctls must be supported by +all video output devices.</para> + </section> + + <section> + <title>Image Format Negotiation</title> + + <para>The output is determined by cropping and image format +parameters. The former select an area of the video picture where the +image will appear, the latter how images are stored in memory, &ie; in +RGB or YUV format, the number of bits per pixel or width and height. +Together they also define how images are scaled in the process.</para> + + <para>As usual these parameters are <emphasis>not</emphasis> reset +at &func-open; time to permit Unix tool chains, programming a device +and then writing to it as if it was a plain file. Well written V4L2 +applications ensure they really get what they want, including cropping +and scaling.</para> + + <para>Cropping initialization at minimum requires to reset the +parameters to defaults. An example is given in <xref +linkend="crop" />.</para> + + <para>To query the current image format applications set the +<structfield>type</structfield> field of a &v4l2-format; to +<constant>V4L2_BUF_TYPE_VIDEO_OUTPUT</constant> or +<constant>V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE</constant> and call the +&VIDIOC-G-FMT; ioctl with a pointer to this structure. Drivers fill +the &v4l2-pix-format; <structfield>pix</structfield> or the +&v4l2-pix-format-mplane; <structfield>pix_mp</structfield> member of the +<structfield>fmt</structfield> union.</para> + + <para>To request different parameters applications set the +<structfield>type</structfield> field of a &v4l2-format; as above and +initialize all fields of the &v4l2-pix-format; +<structfield>vbi</structfield> member of the +<structfield>fmt</structfield> union, or better just modify the +results of <constant>VIDIOC_G_FMT</constant>, and call the +&VIDIOC-S-FMT; ioctl with a pointer to this structure. Drivers may +adjust the parameters and finally return the actual parameters as +<constant>VIDIOC_G_FMT</constant> does.</para> + + <para>Like <constant>VIDIOC_S_FMT</constant> the +&VIDIOC-TRY-FMT; ioctl can be used to learn about hardware limitations +without disabling I/O or possibly time consuming hardware +preparations.</para> + + <para>The contents of &v4l2-pix-format; and &v4l2-pix-format-mplane; +are discussed in <xref linkend="pixfmt" />. See also the specification of the +<constant>VIDIOC_G_FMT</constant>, <constant>VIDIOC_S_FMT</constant> +and <constant>VIDIOC_TRY_FMT</constant> ioctls for details. Video +output devices must implement both the +<constant>VIDIOC_G_FMT</constant> and +<constant>VIDIOC_S_FMT</constant> ioctl, even if +<constant>VIDIOC_S_FMT</constant> ignores all requests and always +returns default parameters as <constant>VIDIOC_G_FMT</constant> does. +<constant>VIDIOC_TRY_FMT</constant> is optional.</para> + </section> + + <section> + <title>Writing Images</title> + + <para>A video output device may support the <link +linkend="rw">write() function</link> and/or streaming (<link +linkend="mmap">memory mapping</link> or <link +linkend="userp">user pointer</link>) I/O. See <xref +linkend="io" /> for details.</para> + </section> diff --git a/Documentation/DocBook/media/v4l/dev-overlay.xml b/Documentation/DocBook/media/v4l/dev-overlay.xml new file mode 100644 index 00000000000..cc6e0c5c960 --- /dev/null +++ b/Documentation/DocBook/media/v4l/dev-overlay.xml @@ -0,0 +1,368 @@ + <title>Video Overlay Interface</title> + <subtitle>Also known as Framebuffer Overlay or Previewing</subtitle> + + <para>Video overlay devices have the ability to genlock (TV-)video +into the (VGA-)video signal of a graphics card, or to store captured +images directly in video memory of a graphics card, typically with +clipping. This can be considerable more efficient than capturing +images and displaying them by other means. In the old days when only +nuclear power plants needed cooling towers this used to be the only +way to put live video into a window.</para> + + <para>Video overlay devices are accessed through the same character +special files as <link linkend="capture">video capture</link> devices. +Note the default function of a <filename>/dev/video</filename> device +is video capturing. The overlay function is only available after +calling the &VIDIOC-S-FMT; ioctl.</para> + + <para>The driver may support simultaneous overlay and capturing +using the read/write and streaming I/O methods. If so, operation at +the nominal frame rate of the video standard is not guaranteed. Frames +may be directed away from overlay to capture, or one field may be used +for overlay and the other for capture if the capture parameters permit +this.</para> + + <para>Applications should use different file descriptors for +capturing and overlay. This must be supported by all drivers capable +of simultaneous capturing and overlay. Optionally these drivers may +also permit capturing and overlay with a single file descriptor for +compatibility with V4L and earlier versions of V4L2.<footnote> + <para>A common application of two file descriptors is the +XFree86 <link linkend="xvideo">Xv/V4L</link> interface driver and +a V4L2 application. While the X server controls video overlay, the +application can take advantage of memory mapping and DMA.</para> + <para>In the opinion of the designers of this API, no driver +writer taking the efforts to support simultaneous capturing and +overlay will restrict this ability by requiring a single file +descriptor, as in V4L and earlier versions of V4L2. Making this +optional means applications depending on two file descriptors need +backup routines to be compatible with all drivers, which is +considerable more work than using two fds in applications which do +not. Also two fd's fit the general concept of one file descriptor for +each logical stream. Hence as a complexity trade-off drivers +<emphasis>must</emphasis> support two file descriptors and +<emphasis>may</emphasis> support single fd operation.</para> + </footnote></para> + + <section> + <title>Querying Capabilities</title> + + <para>Devices supporting the video overlay interface set the +<constant>V4L2_CAP_VIDEO_OVERLAY</constant> flag in the +<structfield>capabilities</structfield> field of &v4l2-capability; +returned by the &VIDIOC-QUERYCAP; ioctl. The overlay I/O method specified +below must be supported. Tuners and audio inputs are optional.</para> + </section> + + <section> + <title>Supplemental Functions</title> + + <para>Video overlay devices shall support <link +linkend="audio">audio input</link>, <link +linkend="tuner">tuner</link>, <link linkend="control">controls</link>, +<link linkend="crop">cropping and scaling</link> and <link +linkend="streaming-par">streaming parameter</link> ioctls as needed. +The <link linkend="video">video input</link> and <link +linkend="standard">video standard</link> ioctls must be supported by +all video overlay devices.</para> + </section> + + <section> + <title>Setup</title> + + <para>Before overlay can commence applications must program the +driver with frame buffer parameters, namely the address and size of +the frame buffer and the image format, for example RGB 5:6:5. The +&VIDIOC-G-FBUF; and &VIDIOC-S-FBUF; ioctls are available to get +and set these parameters, respectively. The +<constant>VIDIOC_S_FBUF</constant> ioctl is privileged because it +allows to set up DMA into physical memory, bypassing the memory +protection mechanisms of the kernel. Only the superuser can change the +frame buffer address and size. Users are not supposed to run TV +applications as root or with SUID bit set. A small helper application +with suitable privileges should query the graphics system and program +the V4L2 driver at the appropriate time.</para> + + <para>Some devices add the video overlay to the output signal +of the graphics card. In this case the frame buffer is not modified by +the video device, and the frame buffer address and pixel format are +not needed by the driver. The <constant>VIDIOC_S_FBUF</constant> ioctl +is not privileged. An application can check for this type of device by +calling the <constant>VIDIOC_G_FBUF</constant> ioctl.</para> + + <para>A driver may support any (or none) of five clipping/blending +methods:<orderedlist> + <listitem> + <para>Chroma-keying displays the overlaid image only where +pixels in the primary graphics surface assume a certain color.</para> + </listitem> + <listitem> + <para>A bitmap can be specified where each bit corresponds +to a pixel in the overlaid image. When the bit is set, the +corresponding video pixel is displayed, otherwise a pixel of the +graphics surface.</para> + </listitem> + <listitem> + <para>A list of clipping rectangles can be specified. In +these regions <emphasis>no</emphasis> video is displayed, so the +graphics surface can be seen here.</para> + </listitem> + <listitem> + <para>The framebuffer has an alpha channel that can be used +to clip or blend the framebuffer with the video.</para> + </listitem> + <listitem> + <para>A global alpha value can be specified to blend the +framebuffer contents with video images.</para> + </listitem> + </orderedlist></para> + + <para>When simultaneous capturing and overlay is supported and +the hardware prohibits different image and frame buffer formats, the +format requested first takes precedence. The attempt to capture +(&VIDIOC-S-FMT;) or overlay (&VIDIOC-S-FBUF;) may fail with an +&EBUSY; or return accordingly modified parameters..</para> + </section> + + <section> + <title>Overlay Window</title> + + <para>The overlaid image is determined by cropping and overlay +window parameters. The former select an area of the video picture to +capture, the latter how images are overlaid and clipped. Cropping +initialization at minimum requires to reset the parameters to +defaults. An example is given in <xref linkend="crop" />.</para> + + <para>The overlay window is described by a &v4l2-window;. It +defines the size of the image, its position over the graphics surface +and the clipping to be applied. To get the current parameters +applications set the <structfield>type</structfield> field of a +&v4l2-format; to <constant>V4L2_BUF_TYPE_VIDEO_OVERLAY</constant> and +call the &VIDIOC-G-FMT; ioctl. The driver fills the +<structname>v4l2_window</structname> substructure named +<structfield>win</structfield>. It is not possible to retrieve a +previously programmed clipping list or bitmap.</para> + + <para>To program the overlay window applications set the +<structfield>type</structfield> field of a &v4l2-format; to +<constant>V4L2_BUF_TYPE_VIDEO_OVERLAY</constant>, initialize the +<structfield>win</structfield> substructure and call the +&VIDIOC-S-FMT; ioctl. The driver adjusts the parameters against +hardware limits and returns the actual parameters as +<constant>VIDIOC_G_FMT</constant> does. Like +<constant>VIDIOC_S_FMT</constant>, the &VIDIOC-TRY-FMT; ioctl can be +used to learn about driver capabilities without actually changing +driver state. Unlike <constant>VIDIOC_S_FMT</constant> this also works +after the overlay has been enabled.</para> + + <para>The scaling factor of the overlaid image is implied by the +width and height given in &v4l2-window; and the size of the cropping +rectangle. For more information see <xref linkend="crop" />.</para> + + <para>When simultaneous capturing and overlay is supported and +the hardware prohibits different image and window sizes, the size +requested first takes precedence. The attempt to capture or overlay as +well (&VIDIOC-S-FMT;) may fail with an &EBUSY; or return accordingly +modified parameters.</para> + + <table pgwide="1" frame="none" id="v4l2-window"> + <title>struct <structname>v4l2_window</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>&v4l2-rect;</entry> + <entry><structfield>w</structfield></entry> + <entry>Size and position of the window relative to the +top, left corner of the frame buffer defined with &VIDIOC-S-FBUF;. The +window can extend the frame buffer width and height, the +<structfield>x</structfield> and <structfield>y</structfield> +coordinates can be negative, and it can lie completely outside the +frame buffer. The driver clips the window accordingly, or if that is +not possible, modifies its size and/or position.</entry> + </row> + <row> + <entry>&v4l2-field;</entry> + <entry><structfield>field</structfield></entry> + <entry>Applications set this field to determine which +video field shall be overlaid, typically one of +<constant>V4L2_FIELD_ANY</constant> (0), +<constant>V4L2_FIELD_TOP</constant>, +<constant>V4L2_FIELD_BOTTOM</constant> or +<constant>V4L2_FIELD_INTERLACED</constant>. Drivers may have to choose +a different field order and return the actual setting here.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>chromakey</structfield></entry> + <entry>When chroma-keying has been negotiated with +&VIDIOC-S-FBUF; applications set this field to the desired pixel value +for the chroma key. The format is the same as the pixel format of the +framebuffer (&v4l2-framebuffer; +<structfield>fmt.pixelformat</structfield> field), with bytes in host +order. E. g. for <link +linkend="V4L2-PIX-FMT-BGR32"><constant>V4L2_PIX_FMT_BGR24</constant></link> +the value should be 0xRRGGBB on a little endian, 0xBBGGRR on a big +endian host.</entry> + </row> + <row> + <entry>&v4l2-clip; *</entry> + <entry><structfield>clips</structfield></entry> + <entry>When chroma-keying has <emphasis>not</emphasis> +been negotiated and &VIDIOC-G-FBUF; indicated this capability, +applications can set this field to point to an array of +clipping rectangles.</entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry>Like the window coordinates +<structfield>w</structfield>, clipping rectangles are defined relative +to the top, left corner of the frame buffer. However clipping +rectangles must not extend the frame buffer width and height, and they +must not overlap. If possible applications should merge adjacent +rectangles. Whether this must create x-y or y-x bands, or the order of +rectangles, is not defined. When clip lists are not supported the +driver ignores this field. Its contents after calling &VIDIOC-S-FMT; +are undefined.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>clipcount</structfield></entry> + <entry>When the application set the +<structfield>clips</structfield> field, this field must contain the +number of clipping rectangles in the list. When clip lists are not +supported the driver ignores this field, its contents after calling +<constant>VIDIOC_S_FMT</constant> are undefined. When clip lists are +supported but no clipping is desired this field must be set to +zero.</entry> + </row> + <row> + <entry>void *</entry> + <entry><structfield>bitmap</structfield></entry> + <entry>When chroma-keying has +<emphasis>not</emphasis> been negotiated and &VIDIOC-G-FBUF; indicated +this capability, applications can set this field to point to a +clipping bit mask.</entry> + </row> + <row> + <entry spanname="hspan"><para>It must be of the same size +as the window, <structfield>w.width</structfield> and +<structfield>w.height</structfield>. Each bit corresponds to a pixel +in the overlaid image, which is displayed only when the bit is +<emphasis>set</emphasis>. Pixel coordinates translate to bits like: +<programlisting> +((__u8 *) <structfield>bitmap</structfield>)[<structfield>w.width</structfield> * y + x / 8] & (1 << (x & 7))</programlisting></para><para>where <structfield>0</structfield> ≤ x < +<structfield>w.width</structfield> and <structfield>0</structfield> ≤ +y <<structfield>w.height</structfield>.<footnote> + <para>Should we require + <structfield>w.width</structfield> to be a multiple of + eight?</para> + </footnote></para><para>When a clipping +bit mask is not supported the driver ignores this field, its contents +after calling &VIDIOC-S-FMT; are undefined. When a bit mask is supported +but no clipping is desired this field must be set to +<constant>NULL</constant>.</para><para>Applications need not create a +clip list or bit mask. When they pass both, or despite negotiating +chroma-keying, the results are undefined. Regardless of the chosen +method, the clipping abilities of the hardware may be limited in +quantity or quality. The results when these limits are exceeded are +undefined.<footnote> + <para>When the image is written into frame buffer +memory it will be undesirable if the driver clips out less pixels +than expected, because the application and graphics system are not +aware these regions need to be refreshed. The driver should clip out +more pixels or not write the image at all.</para> + </footnote></para></entry> + </row> + <row> + <entry>__u8</entry> + <entry><structfield>global_alpha</structfield></entry> + <entry>The global alpha value used to blend the +framebuffer with video images, if global alpha blending has been +negotiated (<constant>V4L2_FBUF_FLAG_GLOBAL_ALPHA</constant>, see +&VIDIOC-S-FBUF;, <xref linkend="framebuffer-flags" />).</entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry>Note this field was added in Linux 2.6.23, extending the structure. However +the <link linkend="vidioc-g-fmt">VIDIOC_G/S/TRY_FMT</link> ioctls, +which take a pointer to a <link +linkend="v4l2-format">v4l2_format</link> parent structure with padding +bytes at the end, are not affected.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="v4l2-clip"> + <title>struct <structname>v4l2_clip</structname><footnote> + <para>The X Window system defines "regions" which are +vectors of struct BoxRec { short x1, y1, x2, y2; } with width = x2 - +x1 and height = y2 - y1, so one cannot pass X11 clip lists +directly.</para> + </footnote></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>&v4l2-rect;</entry> + <entry><structfield>c</structfield></entry> + <entry>Coordinates of the clipping rectangle, relative to +the top, left corner of the frame buffer. Only window pixels +<emphasis>outside</emphasis> all clipping rectangles are +displayed.</entry> + </row> + <row> + <entry>&v4l2-clip; *</entry> + <entry><structfield>next</structfield></entry> + <entry>Pointer to the next clipping rectangle, NULL when +this is the last rectangle. Drivers ignore this field, it cannot be +used to pass a linked list of clipping rectangles.</entry> + </row> + </tbody> + </tgroup> + </table> + + <!-- NB for easier reading this table is duplicated + in the vidioc-cropcap chapter.--> + + <table pgwide="1" frame="none" id="v4l2-rect"> + <title>struct <structname>v4l2_rect</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__s32</entry> + <entry><structfield>left</structfield></entry> + <entry>Horizontal offset of the top, left corner of the +rectangle, in pixels.</entry> + </row> + <row> + <entry>__s32</entry> + <entry><structfield>top</structfield></entry> + <entry>Vertical offset of the top, left corner of the +rectangle, in pixels. Offsets increase to the right and down.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>width</structfield></entry> + <entry>Width of the rectangle, in pixels.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>height</structfield></entry> + <entry>Height of the rectangle, in pixels.</entry> + </row> + </tbody> + </tgroup> + </table> + </section> + + <section> + <title>Enabling Overlay</title> + + <para>To start or stop the frame buffer overlay applications call +the &VIDIOC-OVERLAY; ioctl.</para> + </section> diff --git a/Documentation/DocBook/media/v4l/dev-radio.xml b/Documentation/DocBook/media/v4l/dev-radio.xml new file mode 100644 index 00000000000..3e6ac73b36a --- /dev/null +++ b/Documentation/DocBook/media/v4l/dev-radio.xml @@ -0,0 +1,49 @@ + <title>Radio Interface</title> + + <para>This interface is intended for AM and FM (analog) radio +receivers and transmitters.</para> + + <para>Conventionally V4L2 radio devices are accessed through +character device special files named <filename>/dev/radio</filename> +and <filename>/dev/radio0</filename> to +<filename>/dev/radio63</filename> with major number 81 and minor +numbers 64 to 127.</para> + + <section> + <title>Querying Capabilities</title> + + <para>Devices supporting the radio interface set the +<constant>V4L2_CAP_RADIO</constant> and +<constant>V4L2_CAP_TUNER</constant> or +<constant>V4L2_CAP_MODULATOR</constant> flag in the +<structfield>capabilities</structfield> field of &v4l2-capability; +returned by the &VIDIOC-QUERYCAP; ioctl. Other combinations of +capability flags are reserved for future extensions.</para> + </section> + + <section> + <title>Supplemental Functions</title> + + <para>Radio devices can support <link +linkend="control">controls</link>, and must support the <link +linkend="tuner">tuner or modulator</link> ioctls.</para> + + <para>They do not support the video input or output, audio input +or output, video standard, cropping and scaling, compression and +streaming parameter, or overlay ioctls. All other ioctls and I/O +methods are reserved for future extensions.</para> + </section> + + <section> + <title>Programming</title> + + <para>Radio devices may have a couple audio controls (as discussed +in <xref linkend="control" />) such as a volume control, possibly custom +controls. Further all radio devices have one tuner or modulator (these are +discussed in <xref linkend="tuner" />) with index number zero to select +the radio frequency and to determine if a monaural or FM stereo +program is received/emitted. Drivers switch automatically between AM and FM +depending on the selected frequency. The &VIDIOC-G-TUNER; or +&VIDIOC-G-MODULATOR; ioctl +reports the supported frequency range.</para> + </section> diff --git a/Documentation/DocBook/media/v4l/dev-raw-vbi.xml b/Documentation/DocBook/media/v4l/dev-raw-vbi.xml new file mode 100644 index 00000000000..b788c72c885 --- /dev/null +++ b/Documentation/DocBook/media/v4l/dev-raw-vbi.xml @@ -0,0 +1,339 @@ + <title>Raw VBI Data Interface</title> + + <para>VBI is an abbreviation of Vertical Blanking Interval, a gap +in the sequence of lines of an analog video signal. During VBI +no picture information is transmitted, allowing some time while the +electron beam of a cathode ray tube TV returns to the top of the +screen. Using an oscilloscope you will find here the vertical +synchronization pulses and short data packages ASK +modulated<footnote><para>ASK: Amplitude-Shift Keying. A high signal +level represents a '1' bit, a low level a '0' bit.</para></footnote> +onto the video signal. These are transmissions of services such as +Teletext or Closed Caption.</para> + + <para>Subject of this interface type is raw VBI data, as sampled off +a video signal, or to be added to a signal for output. +The data format is similar to uncompressed video images, a number of +lines times a number of samples per line, we call this a VBI image.</para> + + <para>Conventionally V4L2 VBI devices are accessed through character +device special files named <filename>/dev/vbi</filename> and +<filename>/dev/vbi0</filename> to <filename>/dev/vbi31</filename> with +major number 81 and minor numbers 224 to 255. +<filename>/dev/vbi</filename> is typically a symbolic link to the +preferred VBI device. This convention applies to both input and output +devices.</para> + + <para>To address the problems of finding related video and VBI +devices VBI capturing and output is also available as device function +under <filename>/dev/video</filename>. To capture or output raw VBI +data with these devices applications must call the &VIDIOC-S-FMT; +ioctl. Accessed as <filename>/dev/vbi</filename>, raw VBI capturing +or output is the default device function.</para> + + <section> + <title>Querying Capabilities</title> + + <para>Devices supporting the raw VBI capturing or output API set +the <constant>V4L2_CAP_VBI_CAPTURE</constant> or +<constant>V4L2_CAP_VBI_OUTPUT</constant> flags, respectively, in the +<structfield>capabilities</structfield> field of &v4l2-capability; +returned by the &VIDIOC-QUERYCAP; ioctl. At least one of the +read/write, streaming or asynchronous I/O methods must be +supported. VBI devices may or may not have a tuner or modulator.</para> + </section> + + <section> + <title>Supplemental Functions</title> + + <para>VBI devices shall support <link linkend="video">video +input or output</link>, <link linkend="tuner">tuner or +modulator</link>, and <link linkend="control">controls</link> ioctls +as needed. The <link linkend="standard">video standard</link> ioctls provide +information vital to program a VBI device, therefore must be +supported.</para> + </section> + + <section> + <title>Raw VBI Format Negotiation</title> + + <para>Raw VBI sampling abilities can vary, in particular the +sampling frequency. To properly interpret the data V4L2 specifies an +ioctl to query the sampling parameters. Moreover, to allow for some +flexibility applications can also suggest different parameters.</para> + + <para>As usual these parameters are <emphasis>not</emphasis> +reset at &func-open; time to permit Unix tool chains, programming a +device and then reading from it as if it was a plain file. Well +written V4L2 applications should always ensure they really get what +they want, requesting reasonable parameters and then checking if the +actual parameters are suitable.</para> + + <para>To query the current raw VBI capture parameters +applications set the <structfield>type</structfield> field of a +&v4l2-format; to <constant>V4L2_BUF_TYPE_VBI_CAPTURE</constant> or +<constant>V4L2_BUF_TYPE_VBI_OUTPUT</constant>, and call the +&VIDIOC-G-FMT; ioctl with a pointer to this structure. Drivers fill +the &v4l2-vbi-format; <structfield>vbi</structfield> member of the +<structfield>fmt</structfield> union.</para> + + <para>To request different parameters applications set the +<structfield>type</structfield> field of a &v4l2-format; as above and +initialize all fields of the &v4l2-vbi-format; +<structfield>vbi</structfield> member of the +<structfield>fmt</structfield> union, or better just modify the +results of <constant>VIDIOC_G_FMT</constant>, and call the +&VIDIOC-S-FMT; ioctl with a pointer to this structure. Drivers return +an &EINVAL; only when the given parameters are ambiguous, otherwise +they modify the parameters according to the hardware capabilites and +return the actual parameters. When the driver allocates resources at +this point, it may return an &EBUSY; to indicate the returned +parameters are valid but the required resources are currently not +available. That may happen for instance when the video and VBI areas +to capture would overlap, or when the driver supports multiple opens +and another process already requested VBI capturing or output. Anyway, +applications must expect other resource allocation points which may +return <errorcode>EBUSY</errorcode>, at the &VIDIOC-STREAMON; ioctl +and the first read(), write() and select() call.</para> + + <para>VBI devices must implement both the +<constant>VIDIOC_G_FMT</constant> and +<constant>VIDIOC_S_FMT</constant> ioctl, even if +<constant>VIDIOC_S_FMT</constant> ignores all requests and always +returns default parameters as <constant>VIDIOC_G_FMT</constant> does. +<constant>VIDIOC_TRY_FMT</constant> is optional.</para> + + <table pgwide="1" frame="none" id="v4l2-vbi-format"> + <title>struct <structname>v4l2_vbi_format</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>sampling_rate</structfield></entry> + <entry>Samples per second, i. e. unit 1 Hz.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>offset</structfield></entry> + <entry><para>Horizontal offset of the VBI image, +relative to the leading edge of the line synchronization pulse and +counted in samples: The first sample in the VBI image will be located +<structfield>offset</structfield> / +<structfield>sampling_rate</structfield> seconds following the leading +edge. See also <xref linkend="vbi-hsync" />.</para></entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>samples_per_line</structfield></entry> + <entry></entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>sample_format</structfield></entry> + <entry><para>Defines the sample format as in <xref +linkend="pixfmt" />, a four-character-code.<footnote> + <para>A few devices may be unable to +sample VBI data at all but can extend the video capture window to the +VBI region.</para> + </footnote> Usually this is +<constant>V4L2_PIX_FMT_GREY</constant>, i. e. each sample +consists of 8 bits with lower values oriented towards the black level. +Do not assume any other correlation of values with the signal level. +For example, the MSB does not necessarily indicate if the signal is +'high' or 'low' because 128 may not be the mean value of the +signal. Drivers shall not convert the sample format by software.</para></entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>start</structfield>[2]</entry> + <entry>This is the scanning system line number +associated with the first line of the VBI image, of the first and the +second field respectively. See <xref linkend="vbi-525" /> and +<xref linkend="vbi-625" /> for valid values. VBI input drivers can +return start values 0 if the hardware cannot reliable identify +scanning lines, VBI acquisition may not require this +information.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>count</structfield>[2]</entry> + <entry>The number of lines in the first and second +field image, respectively.</entry> + </row> + <row> + <entry spanname="hspan"><para>Drivers should be as +flexibility as possible. For example, it may be possible to extend or +move the VBI capture window down to the picture area, implementing a +'full field mode' to capture data service transmissions embedded in +the picture.</para><para>An application can set the first or second +<structfield>count</structfield> value to zero if no data is required +from the respective field; <structfield>count</structfield>[1] if the +scanning system is progressive, &ie; not interlaced. The +corresponding start value shall be ignored by the application and +driver. Anyway, drivers may not support single field capturing and +return both count values non-zero.</para><para>Both +<structfield>count</structfield> values set to zero, or line numbers +outside the bounds depicted in <xref linkend="vbi-525" /> and <xref + linkend="vbi-625" />, or a field image covering +lines of two fields, are invalid and shall not be returned by the +driver.</para><para>To initialize the <structfield>start</structfield> +and <structfield>count</structfield> fields, applications must first +determine the current video standard selection. The &v4l2-std-id; or +the <structfield>framelines</structfield> field of &v4l2-standard; can +be evaluated for this purpose.</para></entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>flags</structfield></entry> + <entry>See <xref linkend="vbifmt-flags" /> below. Currently +only drivers set flags, applications must set this field to +zero.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[2]</entry> + <entry>This array is reserved for future extensions. +Drivers and applications must set it to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="vbifmt-flags"> + <title>Raw VBI Format Flags</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_VBI_UNSYNC</constant></entry> + <entry>0x0001</entry> + <entry><para>This flag indicates hardware which does not +properly distinguish between fields. Normally the VBI image stores the +first field (lower scanning line numbers) first in memory. This may be +a top or bottom field depending on the video standard. When this flag +is set the first or second field may be stored first, however the +fields are still in correct temporal order with the older field first +in memory.<footnote> + <para>Most VBI services transmit on both fields, but +some have different semantics depending on the field number. These +cannot be reliable decoded or encoded when +<constant>V4L2_VBI_UNSYNC</constant> is set.</para> + </footnote></para></entry> + </row> + <row> + <entry><constant>V4L2_VBI_INTERLACED</constant></entry> + <entry>0x0002</entry> + <entry>By default the two field images will be passed +sequentially; all lines of the first field followed by all lines of +the second field (compare <xref linkend="field-order" /> +<constant>V4L2_FIELD_SEQ_TB</constant> and +<constant>V4L2_FIELD_SEQ_BT</constant>, whether the top or bottom +field is first in memory depends on the video standard). When this +flag is set, the two fields are interlaced (cf. +<constant>V4L2_FIELD_INTERLACED</constant>). The first line of the +first field followed by the first line of the second field, then the +two second lines, and so on. Such a layout may be necessary when the +hardware has been programmed to capture or output interlaced video +images and is unable to separate the fields for VBI capturing at +the same time. For simplicity setting this flag implies that both +<structfield>count</structfield> values are equal and non-zero.</entry> + </row> + </tbody> + </tgroup> + </table> + + <figure id="vbi-hsync"> + <title>Line synchronization</title> + <mediaobject> + <imageobject> + <imagedata fileref="vbi_hsync.pdf" format="PS" /> + </imageobject> + <imageobject> + <imagedata fileref="vbi_hsync.gif" format="GIF" /> + </imageobject> + <textobject> + <phrase>Line synchronization diagram</phrase> + </textobject> + </mediaobject> + </figure> + + <figure id="vbi-525"> + <title>ITU-R 525 line numbering (M/NTSC and M/PAL)</title> + <mediaobject> + <imageobject> + <imagedata fileref="vbi_525.pdf" format="PS" /> + </imageobject> + <imageobject> + <imagedata fileref="vbi_525.gif" format="GIF" /> + </imageobject> + <textobject> + <phrase>NTSC field synchronization diagram</phrase> + </textobject> + <caption> + <para>(1) For the purpose of this specification field 2 +starts in line 264 and not 263.5 because half line capturing is not +supported.</para> + </caption> + </mediaobject> + </figure> + + <figure id="vbi-625"> + <title>ITU-R 625 line numbering</title> + <mediaobject> + <imageobject> + <imagedata fileref="vbi_625.pdf" format="PS" /> + </imageobject> + <imageobject> + <imagedata fileref="vbi_625.gif" format="GIF" /> + </imageobject> + <textobject> + <phrase>PAL/SECAM field synchronization diagram</phrase> + </textobject> + <caption> + <para>(1) For the purpose of this specification field 2 +starts in line 314 and not 313.5 because half line capturing is not +supported.</para> + </caption> + </mediaobject> + </figure> + + <para>Remember the VBI image format depends on the selected +video standard, therefore the application must choose a new standard or +query the current standard first. Attempts to read or write data ahead +of format negotiation, or after switching the video standard which may +invalidate the negotiated VBI parameters, should be refused by the +driver. A format change during active I/O is not permitted.</para> + </section> + + <section> + <title>Reading and writing VBI images</title> + + <para>To assure synchronization with the field number and easier +implementation, the smallest unit of data passed at a time is one +frame, consisting of two fields of VBI images immediately following in +memory.</para> + + <para>The total size of a frame computes as follows:</para> + + <programlisting> +(<structfield>count</structfield>[0] + <structfield>count</structfield>[1]) * +<structfield>samples_per_line</structfield> * sample size in bytes</programlisting> + + <para>The sample size is most likely always one byte, +applications must check the <structfield>sample_format</structfield> +field though, to function properly with other drivers.</para> + + <para>A VBI device may support <link + linkend="rw">read/write</link> and/or streaming (<link + linkend="mmap">memory mapping</link> or <link + linkend="userp">user pointer</link>) I/O. The latter bears the +possibility of synchronizing video and +VBI data by using buffer timestamps.</para> + + <para>Remember the &VIDIOC-STREAMON; ioctl and the first read(), +write() and select() call can be resource allocation points returning +an &EBUSY; if the required hardware resources are temporarily +unavailable, for example the device is already in use by another +process.</para> + </section> diff --git a/Documentation/DocBook/media/v4l/dev-rds.xml b/Documentation/DocBook/media/v4l/dev-rds.xml new file mode 100644 index 00000000000..be2f3373732 --- /dev/null +++ b/Documentation/DocBook/media/v4l/dev-rds.xml @@ -0,0 +1,196 @@ + <title>RDS Interface</title> + + <para>The Radio Data System transmits supplementary +information in binary format, for example the station name or travel +information, on an inaudible audio subcarrier of a radio program. This +interface is aimed at devices capable of receiving and/or transmitting RDS +information.</para> + + <para>For more information see the core RDS standard <xref linkend="iec62106" /> +and the RBDS standard <xref linkend="nrsc4" />.</para> + + <para>Note that the RBDS standard as is used in the USA is almost identical +to the RDS standard. Any RDS decoder/encoder can also handle RBDS. Only some of the +fields have slightly different meanings. See the RBDS standard for more +information.</para> + + <para>The RBDS standard also specifies support for MMBS (Modified Mobile Search). +This is a proprietary format which seems to be discontinued. The RDS interface does not +support this format. Should support for MMBS (or the so-called 'E blocks' in general) +be needed, then please contact the linux-media mailing list: &v4l-ml;.</para> + + <section> + <title>Querying Capabilities</title> + + <para>Devices supporting the RDS capturing API set +the <constant>V4L2_CAP_RDS_CAPTURE</constant> flag in +the <structfield>capabilities</structfield> field of &v4l2-capability; +returned by the &VIDIOC-QUERYCAP; ioctl. Any tuner that supports RDS +will set the <constant>V4L2_TUNER_CAP_RDS</constant> flag in +the <structfield>capability</structfield> field of &v4l2-tuner;. If +the driver only passes RDS blocks without interpreting the data +the <constant>V4L2_TUNER_CAP_RDS_BLOCK_IO</constant> flag has to be +set, see <link linkend="reading-rds-data">Reading RDS data</link>. +For future use the +flag <constant>V4L2_TUNER_CAP_RDS_CONTROLS</constant> has also been +defined. However, a driver for a radio tuner with this capability does +not yet exist, so if you are planning to write such a driver you +should discuss this on the linux-media mailing list: &v4l-ml;.</para> + + <para> Whether an RDS signal is present can be detected by looking +at the <structfield>rxsubchans</structfield> field of &v4l2-tuner;: +the <constant>V4L2_TUNER_SUB_RDS</constant> will be set if RDS data +was detected.</para> + + <para>Devices supporting the RDS output API +set the <constant>V4L2_CAP_RDS_OUTPUT</constant> flag in +the <structfield>capabilities</structfield> field of &v4l2-capability; +returned by the &VIDIOC-QUERYCAP; ioctl. +Any modulator that supports RDS will set the +<constant>V4L2_TUNER_CAP_RDS</constant> flag in the <structfield>capability</structfield> +field of &v4l2-modulator;. +In order to enable the RDS transmission one must set the <constant>V4L2_TUNER_SUB_RDS</constant> +bit in the <structfield>txsubchans</structfield> field of &v4l2-modulator;. +If the driver only passes RDS blocks without interpreting the data +the <constant>V4L2_TUNER_CAP_RDS_BLOCK_IO</constant> flag has to be set. If the +tuner is capable of handling RDS entities like program identification codes and radio +text, the flag <constant>V4L2_TUNER_CAP_RDS_CONTROLS</constant> should be set, +see <link linkend="writing-rds-data">Writing RDS data</link> and +<link linkend="fm-tx-controls">FM Transmitter Control Reference</link>.</para> + </section> + + <section id="reading-rds-data"> + <title>Reading RDS data</title> + + <para>RDS data can be read from the radio device +with the &func-read; function. The data is packed in groups of three bytes.</para> + </section> + + <section id="writing-rds-data"> + <title>Writing RDS data</title> + + <para>RDS data can be written to the radio device +with the &func-write; function. The data is packed in groups of three bytes, +as follows:</para> + </section> + + <section> + <title>RDS datastructures</title> + <table frame="none" pgwide="1" id="v4l2-rds-data"> + <title>struct +<structname>v4l2_rds_data</structname></title> + <tgroup cols="3"> + <colspec colname="c1" colwidth="1*" /> + <colspec colname="c2" colwidth="1*" /> + <colspec colname="c3" colwidth="5*" /> + <tbody valign="top"> + <row> + <entry>__u8</entry> + <entry><structfield>lsb</structfield></entry> + <entry>Least Significant Byte of RDS Block</entry> + </row> + <row> + <entry>__u8</entry> + <entry><structfield>msb</structfield></entry> + <entry>Most Significant Byte of RDS Block</entry> + </row> + <row> + <entry>__u8</entry> + <entry><structfield>block</structfield></entry> + <entry>Block description</entry> + </row> + </tbody> + </tgroup> + </table> + <table frame="none" pgwide="1" id="v4l2-rds-block"> + <title>Block description</title> + <tgroup cols="2"> + <colspec colname="c1" colwidth="1*" /> + <colspec colname="c2" colwidth="5*" /> + <tbody valign="top"> + <row> + <entry>Bits 0-2</entry> + <entry>Block (aka offset) of the received data.</entry> + </row> + <row> + <entry>Bits 3-5</entry> + <entry>Deprecated. Currently identical to bits 0-2. Do not use these bits.</entry> + </row> + <row> + <entry>Bit 6</entry> + <entry>Corrected bit. Indicates that an error was corrected for this data block.</entry> + </row> + <row> + <entry>Bit 7</entry> + <entry>Error bit. Indicates that an uncorrectable error occurred during reception of this block.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table frame="none" pgwide="1" id="v4l2-rds-block-codes"> + <title>Block defines</title> + <tgroup cols="4"> + <colspec colname="c1" colwidth="1*" /> + <colspec colname="c2" colwidth="1*" /> + <colspec colname="c3" colwidth="1*" /> + <colspec colname="c4" colwidth="5*" /> + <tbody valign="top"> + <row> + <entry>V4L2_RDS_BLOCK_MSK</entry> + <entry> </entry> + <entry>7</entry> + <entry>Mask for bits 0-2 to get the block ID.</entry> + </row> + <row> + <entry>V4L2_RDS_BLOCK_A</entry> + <entry> </entry> + <entry>0</entry> + <entry>Block A.</entry> + </row> + <row> + <entry>V4L2_RDS_BLOCK_B</entry> + <entry> </entry> + <entry>1</entry> + <entry>Block B.</entry> + </row> + <row> + <entry>V4L2_RDS_BLOCK_C</entry> + <entry> </entry> + <entry>2</entry> + <entry>Block C.</entry> + </row> + <row> + <entry>V4L2_RDS_BLOCK_D</entry> + <entry> </entry> + <entry>3</entry> + <entry>Block D.</entry> + </row> + <row> + <entry>V4L2_RDS_BLOCK_C_ALT</entry> + <entry> </entry> + <entry>4</entry> + <entry>Block C'.</entry> + </row> + <row> + <entry>V4L2_RDS_BLOCK_INVALID</entry> + <entry>read-only</entry> + <entry>7</entry> + <entry>An invalid block.</entry> + </row> + <row> + <entry>V4L2_RDS_BLOCK_CORRECTED</entry> + <entry>read-only</entry> + <entry>0x40</entry> + <entry>A bit error was detected but corrected.</entry> + </row> + <row> + <entry>V4L2_RDS_BLOCK_ERROR</entry> + <entry>read-only</entry> + <entry>0x80</entry> + <entry>An uncorrectable error occurred.</entry> + </row> + </tbody> + </tgroup> + </table> + </section> diff --git a/Documentation/DocBook/media/v4l/dev-sdr.xml b/Documentation/DocBook/media/v4l/dev-sdr.xml new file mode 100644 index 00000000000..dc14804f543 --- /dev/null +++ b/Documentation/DocBook/media/v4l/dev-sdr.xml @@ -0,0 +1,110 @@ + <title>Software Defined Radio Interface (SDR)</title> + + <note> + <title>Experimental</title> + <para>This is an <link linkend="experimental"> experimental </link> + interface and may change in the future.</para> + </note> + + <para> +SDR is an abbreviation of Software Defined Radio, the radio device +which uses application software for modulation or demodulation. This interface +is intended for controlling and data streaming of such devices. + </para> + + <para> +SDR devices are accessed through character device special files named +<filename>/dev/swradio0</filename> to <filename>/dev/swradio255</filename> +with major number 81 and dynamically allocated minor numbers 0 to 255. + </para> + + <section> + <title>Querying Capabilities</title> + + <para> +Devices supporting the SDR receiver interface set the +<constant>V4L2_CAP_SDR_CAPTURE</constant> and +<constant>V4L2_CAP_TUNER</constant> flag in the +<structfield>capabilities</structfield> field of &v4l2-capability; +returned by the &VIDIOC-QUERYCAP; ioctl. That flag means the device has an +Analog to Digital Converter (ADC), which is a mandatory element for the SDR receiver. +At least one of the read/write, streaming or asynchronous I/O methods must +be supported. + </para> + </section> + + <section> + <title>Supplemental Functions</title> + + <para> +SDR devices can support <link linkend="control">controls</link>, and must +support the <link linkend="tuner">tuner</link> ioctls. Tuner ioctls are used +for setting the ADC sampling rate (sampling frequency) and the possible RF tuner +frequency. + </para> + + <para> +The <constant>V4L2_TUNER_ADC</constant> tuner type is used for ADC tuners, and +the <constant>V4L2_TUNER_RF</constant> tuner type is used for RF tuners. The +tuner index of the RF tuner (if any) must always follow the ADC tuner index. +Normally the ADC tuner is #0 and the RF tuner is #1. + </para> + + <para> +The &VIDIOC-S-HW-FREQ-SEEK; ioctl is not supported. + </para> + </section> + + <section> + <title>Data Format Negotiation</title> + + <para> +The SDR capture device uses the <link linkend="format">format</link> ioctls to +select the capture format. Both the sampling resolution and the data streaming +format are bound to that selectable format. In addition to the basic +<link linkend="format">format</link> ioctls, the &VIDIOC-ENUM-FMT; ioctl +must be supported as well. + </para> + + <para> +To use the <link linkend="format">format</link> ioctls applications set the +<structfield>type</structfield> field of a &v4l2-format; to +<constant>V4L2_BUF_TYPE_SDR_CAPTURE</constant> and use the &v4l2-sdr-format; +<structfield>sdr</structfield> member of the <structfield>fmt</structfield> +union as needed per the desired operation. +Currently only the <structfield>pixelformat</structfield> field of +&v4l2-sdr-format; is used. The content of that field is the V4L2 fourcc code +of the data format. + </para> + + <table pgwide="1" frame="none" id="v4l2-sdr-format"> + <title>struct <structname>v4l2_sdr_format</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>pixelformat</structfield></entry> + <entry> +The data format or type of compression, set by the application. This is a +little endian <link linkend="v4l2-fourcc">four character code</link>. +V4L2 defines SDR formats in <xref linkend="sdr-formats" />. + </entry> + </row> + <row> + <entry>__u8</entry> + <entry><structfield>reserved[28]</structfield></entry> + <entry>This array is reserved for future extensions. +Drivers and applications must set it to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + + <para> +An SDR device may support <link linkend="rw">read/write</link> +and/or streaming (<link linkend="mmap">memory mapping</link> +or <link linkend="userp">user pointer</link>) I/O. + </para> + + </section> diff --git a/Documentation/DocBook/media/v4l/dev-sliced-vbi.xml b/Documentation/DocBook/media/v4l/dev-sliced-vbi.xml new file mode 100644 index 00000000000..548f8ea28de --- /dev/null +++ b/Documentation/DocBook/media/v4l/dev-sliced-vbi.xml @@ -0,0 +1,699 @@ + <title>Sliced VBI Data Interface</title> + + <para>VBI stands for Vertical Blanking Interval, a gap in the +sequence of lines of an analog video signal. During VBI no picture +information is transmitted, allowing some time while the electron beam +of a cathode ray tube TV returns to the top of the screen.</para> + + <para>Sliced VBI devices use hardware to demodulate data transmitted +in the VBI. V4L2 drivers shall <emphasis>not</emphasis> do this by +software, see also the <link linkend="raw-vbi">raw VBI +interface</link>. The data is passed as short packets of fixed size, +covering one scan line each. The number of packets per video frame is +variable.</para> + + <para>Sliced VBI capture and output devices are accessed through the +same character special files as raw VBI devices. When a driver +supports both interfaces, the default function of a +<filename>/dev/vbi</filename> device is <emphasis>raw</emphasis> VBI +capturing or output, and the sliced VBI function is only available +after calling the &VIDIOC-S-FMT; ioctl as defined below. Likewise a +<filename>/dev/video</filename> device may support the sliced VBI API, +however the default function here is video capturing or output. +Different file descriptors must be used to pass raw and sliced VBI +data simultaneously, if this is supported by the driver.</para> + + <section> + <title>Querying Capabilities</title> + + <para>Devices supporting the sliced VBI capturing or output API +set the <constant>V4L2_CAP_SLICED_VBI_CAPTURE</constant> or +<constant>V4L2_CAP_SLICED_VBI_OUTPUT</constant> flag respectively, in +the <structfield>capabilities</structfield> field of &v4l2-capability; +returned by the &VIDIOC-QUERYCAP; ioctl. At least one of the +read/write, streaming or asynchronous <link linkend="io">I/O +methods</link> must be supported. Sliced VBI devices may have a tuner +or modulator.</para> + </section> + + <section> + <title>Supplemental Functions</title> + + <para>Sliced VBI devices shall support <link linkend="video">video +input or output</link> and <link linkend="tuner">tuner or +modulator</link> ioctls if they have these capabilities, and they may +support <link linkend="control">control</link> ioctls. The <link +linkend="standard">video standard</link> ioctls provide information +vital to program a sliced VBI device, therefore must be +supported.</para> + </section> + + <section id="sliced-vbi-format-negotitation"> + <title>Sliced VBI Format Negotiation</title> + + <para>To find out which data services are supported by the +hardware applications can call the &VIDIOC-G-SLICED-VBI-CAP; ioctl. +All drivers implementing the sliced VBI interface must support this +ioctl. The results may differ from those of the &VIDIOC-S-FMT; ioctl +when the number of VBI lines the hardware can capture or output per +frame, or the number of services it can identify on a given line are +limited. For example on PAL line 16 the hardware may be able to look +for a VPS or Teletext signal, but not both at the same time.</para> + + <para>To determine the currently selected services applications +set the <structfield>type </structfield> field of &v4l2-format; to +<constant> V4L2_BUF_TYPE_SLICED_VBI_CAPTURE</constant> or <constant> +V4L2_BUF_TYPE_SLICED_VBI_OUTPUT</constant>, and the &VIDIOC-G-FMT; +ioctl fills the <structfield>fmt.sliced</structfield> member, a +&v4l2-sliced-vbi-format;.</para> + + <para>Applications can request different parameters by +initializing or modifying the <structfield>fmt.sliced</structfield> +member and calling the &VIDIOC-S-FMT; ioctl with a pointer to the +<structname>v4l2_format</structname> structure.</para> + + <para>The sliced VBI API is more complicated than the raw VBI API +because the hardware must be told which VBI service to expect on each +scan line. Not all services may be supported by the hardware on all +lines (this is especially true for VBI output where Teletext is often +unsupported and other services can only be inserted in one specific +line). In many cases, however, it is sufficient to just set the +<structfield>service_set</structfield> field to the required services +and let the driver fill the <structfield>service_lines</structfield> +array according to hardware capabilities. Only if more precise control +is needed should the programmer set the +<structfield>service_lines</structfield> array explicitly.</para> + + <para>The &VIDIOC-S-FMT; ioctl modifies the parameters +according to hardware capabilities. When the driver allocates +resources at this point, it may return an &EBUSY; if the required +resources are temporarily unavailable. Other resource allocation +points which may return <errorcode>EBUSY</errorcode> can be the +&VIDIOC-STREAMON; ioctl and the first &func-read;, &func-write; and +&func-select; call.</para> + + <table frame="none" pgwide="1" id="v4l2-sliced-vbi-format"> + <title>struct +<structname>v4l2_sliced_vbi_format</structname></title> + <tgroup cols="5"> + <colspec colname="c1" colwidth="3*" /> + <colspec colname="c2" colwidth="3*" /> + <colspec colname="c3" colwidth="2*" /> + <colspec colname="c4" colwidth="2*" /> + <colspec colname="c5" colwidth="2*" /> + <spanspec namest="c3" nameend="c5" spanname="hspan" /> + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>service_set</structfield></entry> + <entry spanname="hspan"><para>If +<structfield>service_set</structfield> is non-zero when passed with +&VIDIOC-S-FMT; or &VIDIOC-TRY-FMT;, the +<structfield>service_lines</structfield> array will be filled by the +driver according to the services specified in this field. For example, +if <structfield>service_set</structfield> is initialized with +<constant>V4L2_SLICED_TELETEXT_B | V4L2_SLICED_WSS_625</constant>, a +driver for the cx25840 video decoder sets lines 7-22 of both +fields<footnote><para>According to <link +linkend="ets300706">ETS 300 706</link> lines 6-22 of the +first field and lines 5-22 of the second field may carry Teletext +data.</para></footnote> to <constant>V4L2_SLICED_TELETEXT_B</constant> +and line 23 of the first field to +<constant>V4L2_SLICED_WSS_625</constant>. If +<structfield>service_set</structfield> is set to zero, then the values +of <structfield>service_lines</structfield> will be used instead. +</para><para>On return the driver sets this field to the union of all +elements of the returned <structfield>service_lines</structfield> +array. It may contain less services than requested, perhaps just one, +if the hardware cannot handle more services simultaneously. It may be +empty (zero) if none of the requested services are supported by the +hardware.</para></entry> + </row> + <row> + <entry>__u16</entry> + <entry><structfield>service_lines</structfield>[2][24]</entry> + <entry spanname="hspan"><para>Applications initialize this +array with sets of data services the driver shall look for or insert +on the respective scan line. Subject to hardware capabilities drivers +return the requested set, a subset, which may be just a single +service, or an empty set. When the hardware cannot handle multiple +services on the same line the driver shall choose one. No assumptions +can be made on which service the driver chooses.</para><para>Data +services are defined in <xref linkend="vbi-services2" />. Array indices +map to ITU-R line numbers (see also <xref linkend="vbi-525" /> and <xref + linkend="vbi-625" />) as follows: <!-- No nested +tables, sigh. --></para></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry>Element</entry> + <entry>525 line systems</entry> + <entry>625 line systems</entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry><structfield>service_lines</structfield>[0][1]</entry> + <entry align="center">1</entry> + <entry align="center">1</entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry><structfield>service_lines</structfield>[0][23]</entry> + <entry align="center">23</entry> + <entry align="center">23</entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry><structfield>service_lines</structfield>[1][1]</entry> + <entry align="center">264</entry> + <entry align="center">314</entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry><structfield>service_lines</structfield>[1][23]</entry> + <entry align="center">286</entry> + <entry align="center">336</entry> + </row> + <!-- End of line numbers table. --> + <row> + <entry></entry> + <entry></entry> + <entry spanname="hspan">Drivers must set +<structfield>service_lines</structfield>[0][0] and +<structfield>service_lines</structfield>[1][0] to zero.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>io_size</structfield></entry> + <entry spanname="hspan">Maximum number of bytes passed by +one &func-read; or &func-write; call, and the buffer size in bytes for +the &VIDIOC-QBUF; and &VIDIOC-DQBUF; ioctl. Drivers set this field to +the size of &v4l2-sliced-vbi-data; times the number of non-zero +elements in the returned <structfield>service_lines</structfield> +array (that is the number of lines potentially carrying data).</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[2]</entry> + <entry spanname="hspan">This array is reserved for future +extensions. Applications and drivers must set it to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + + <!-- See also vidioc-g-sliced-vbi-cap.sgml --> + <table frame="none" pgwide="1" id="vbi-services2"> + <title>Sliced VBI services</title> + <tgroup cols="5"> + <colspec colname="c1" colwidth="2*" /> + <colspec colname="c2" colwidth="1*" /> + <colspec colname="c3" colwidth="1*" /> + <colspec colname="c4" colwidth="2*" /> + <colspec colname="c5" colwidth="2*" /> + <spanspec namest="c3" nameend="c5" spanname="rlp" /> + <thead> + <row> + <entry>Symbol</entry> + <entry>Value</entry> + <entry>Reference</entry> + <entry>Lines, usually</entry> + <entry>Payload</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry><constant>V4L2_SLICED_TELETEXT_B</constant> +(Teletext System B)</entry> + <entry>0x0001</entry> + <entry><xref linkend="ets300706" />, <xref linkend="itu653" /></entry> + <entry>PAL/SECAM line 7-22, 320-335 (second field 7-22)</entry> + <entry>Last 42 of the 45 byte Teletext packet, that is +without clock run-in and framing code, lsb first transmitted.</entry> + </row> + <row> + <entry><constant>V4L2_SLICED_VPS</constant></entry> + <entry>0x0400</entry> + <entry><xref linkend="ets300231" /></entry> + <entry>PAL line 16</entry> + <entry>Byte number 3 to 15 according to Figure 9 of +ETS 300 231, lsb first transmitted.</entry> + </row> + <row> + <entry><constant>V4L2_SLICED_CAPTION_525</constant></entry> + <entry>0x1000</entry> + <entry><xref linkend="eia608" /></entry> + <entry>NTSC line 21, 284 (second field 21)</entry> + <entry>Two bytes in transmission order, including parity +bit, lsb first transmitted.</entry> + </row> + <row> + <entry><constant>V4L2_SLICED_WSS_625</constant></entry> + <entry>0x4000</entry> + <entry><xref linkend="itu1119" />, <xref linkend="en300294" /></entry> + <entry>PAL/SECAM line 23</entry> + <entry><screen> +Byte 0 1 + msb lsb msb lsb + Bit 7 6 5 4 3 2 1 0 x x 13 12 11 10 9 +</screen></entry> + </row> + <row> + <entry><constant>V4L2_SLICED_VBI_525</constant></entry> + <entry>0x1000</entry> + <entry spanname="rlp">Set of services applicable to 525 +line systems.</entry> + </row> + <row> + <entry><constant>V4L2_SLICED_VBI_625</constant></entry> + <entry>0x4401</entry> + <entry spanname="rlp">Set of services applicable to 625 +line systems.</entry> + </row> + </tbody> + </tgroup> + </table> + + <para>Drivers may return an &EINVAL; when applications attempt to +read or write data without prior format negotiation, after switching +the video standard (which may invalidate the negotiated VBI +parameters) and after switching the video input (which may change the +video standard as a side effect). The &VIDIOC-S-FMT; ioctl may return +an &EBUSY; when applications attempt to change the format while i/o is +in progress (between a &VIDIOC-STREAMON; and &VIDIOC-STREAMOFF; call, +and after the first &func-read; or &func-write; call).</para> + </section> + + <section> + <title>Reading and writing sliced VBI data</title> + + <para>A single &func-read; or &func-write; call must pass all data +belonging to one video frame. That is an array of +<structname>v4l2_sliced_vbi_data</structname> structures with one or +more elements and a total size not exceeding +<structfield>io_size</structfield> bytes. Likewise in streaming I/O +mode one buffer of <structfield>io_size</structfield> bytes must +contain data of one video frame. The <structfield>id</structfield> of +unused <structname>v4l2_sliced_vbi_data</structname> elements must be +zero.</para> + + <table frame="none" pgwide="1" id="v4l2-sliced-vbi-data"> + <title>struct +<structname>v4l2_sliced_vbi_data</structname></title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>id</structfield></entry> + <entry>A flag from <xref linkend="vbi-services" /> +identifying the type of data in this packet. Only a single bit must be +set. When the <structfield>id</structfield> of a captured packet is +zero, the packet is empty and the contents of other fields are +undefined. Applications shall ignore empty packets. When the +<structfield>id</structfield> of a packet for output is zero the +contents of the <structfield>data</structfield> field are undefined +and the driver must no longer insert data on the requested +<structfield>field</structfield> and +<structfield>line</structfield>.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>field</structfield></entry> + <entry>The video field number this data has been captured +from, or shall be inserted at. <constant>0</constant> for the first +field, <constant>1</constant> for the second field.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>line</structfield></entry> + <entry>The field (as opposed to frame) line number this +data has been captured from, or shall be inserted at. See <xref + linkend="vbi-525" /> and <xref linkend="vbi-625" /> for valid +values. Sliced VBI capture devices can set the line number of all +packets to <constant>0</constant> if the hardware cannot reliably +identify scan lines. The field number must always be valid.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield></entry> + <entry>This field is reserved for future extensions. +Applications and drivers must set it to zero.</entry> + </row> + <row> + <entry>__u8</entry> + <entry><structfield>data</structfield>[48]</entry> + <entry>The packet payload. See <xref + linkend="vbi-services" /> for the contents and number of +bytes passed for each data type. The contents of padding bytes at the +end of this array are undefined, drivers and applications shall ignore +them.</entry> + </row> + </tbody> + </tgroup> + </table> + + <para>Packets are always passed in ascending line number order, +without duplicate line numbers. The &func-write; function and the +&VIDIOC-QBUF; ioctl must return an &EINVAL; when applications violate +this rule. They must also return an &EINVAL; when applications pass an +incorrect field or line number, or a combination of +<structfield>field</structfield>, <structfield>line</structfield> and +<structfield>id</structfield> which has not been negotiated with the +&VIDIOC-G-FMT; or &VIDIOC-S-FMT; ioctl. When the line numbers are +unknown the driver must pass the packets in transmitted order. The +driver can insert empty packets with <structfield>id</structfield> set +to zero anywhere in the packet array.</para> + + <para>To assure synchronization and to distinguish from frame +dropping, when a captured frame does not carry any of the requested +data services drivers must pass one or more empty packets. When an +application fails to pass VBI data in time for output, the driver +must output the last VPS and WSS packet again, and disable the output +of Closed Caption and Teletext data, or output data which is ignored +by Closed Caption and Teletext decoders.</para> + + <para>A sliced VBI device may support <link +linkend="rw">read/write</link> and/or streaming (<link +linkend="mmap">memory mapping</link> and/or <link linkend="userp">user +pointer</link>) I/O. The latter bears the possibility of synchronizing +video and VBI data by using buffer timestamps.</para> + + </section> + + <section> + <title>Sliced VBI Data in MPEG Streams</title> + + <para>If a device can produce an MPEG output stream, it may be +capable of providing <link +linkend="sliced-vbi-format-negotitation">negotiated sliced VBI +services</link> as data embedded in the MPEG stream. Users or +applications control this sliced VBI data insertion with the <link +linkend="v4l2-mpeg-stream-vbi-fmt">V4L2_CID_MPEG_STREAM_VBI_FMT</link> +control.</para> + + <para>If the driver does not provide the <link +linkend="v4l2-mpeg-stream-vbi-fmt">V4L2_CID_MPEG_STREAM_VBI_FMT</link> +control, or only allows that control to be set to <link +linkend="v4l2-mpeg-stream-vbi-fmt"><constant> +V4L2_MPEG_STREAM_VBI_FMT_NONE</constant></link>, then the device +cannot embed sliced VBI data in the MPEG stream.</para> + + <para>The <link linkend="v4l2-mpeg-stream-vbi-fmt"> +V4L2_CID_MPEG_STREAM_VBI_FMT</link> control does not implicitly set +the device driver to capture nor cease capturing sliced VBI data. The +control only indicates to embed sliced VBI data in the MPEG stream, if +an application has negotiated sliced VBI service be captured.</para> + + <para>It may also be the case that a device can embed sliced VBI +data in only certain types of MPEG streams: for example in an MPEG-2 +PS but not an MPEG-2 TS. In this situation, if sliced VBI data +insertion is requested, the sliced VBI data will be embedded in MPEG +stream types when supported, and silently omitted from MPEG stream +types where sliced VBI data insertion is not supported by the device. +</para> + + <para>The following subsections specify the format of the +embedded sliced VBI data.</para> + + <section> + <title>MPEG Stream Embedded, Sliced VBI Data Format: NONE</title> + <para>The <link linkend="v4l2-mpeg-stream-vbi-fmt"><constant> +V4L2_MPEG_STREAM_VBI_FMT_NONE</constant></link> embedded sliced VBI +format shall be interpreted by drivers as a control to cease +embedding sliced VBI data in MPEG streams. Neither the device nor +driver shall insert "empty" embedded sliced VBI data packets in the +MPEG stream when this format is set. No MPEG stream data structures +are specified for this format.</para> + </section> + + <section> + <title>MPEG Stream Embedded, Sliced VBI Data Format: IVTV</title> + <para>The <link linkend="v4l2-mpeg-stream-vbi-fmt"><constant> +V4L2_MPEG_STREAM_VBI_FMT_IVTV</constant></link> embedded sliced VBI +format, when supported, indicates to the driver to embed up to 36 +lines of sliced VBI data per frame in an MPEG-2 <emphasis>Private +Stream 1 PES</emphasis> packet encapsulated in an MPEG-2 <emphasis> +Program Pack</emphasis> in the MPEG stream.</para> + + <para><emphasis>Historical context</emphasis>: This format +specification originates from a custom, embedded, sliced VBI data +format used by the <filename>ivtv</filename> driver. This format +has already been informally specified in the kernel sources in the +file <filename>Documentation/video4linux/cx2341x/README.vbi</filename> +. The maximum size of the payload and other aspects of this format +are driven by the CX23415 MPEG decoder's capabilities and limitations +with respect to extracting, decoding, and displaying sliced VBI data +embedded within an MPEG stream.</para> + + <para>This format's use is <emphasis>not</emphasis> exclusive to +the <filename>ivtv</filename> driver <emphasis>nor</emphasis> +exclusive to CX2341x devices, as the sliced VBI data packet insertion +into the MPEG stream is implemented in driver software. At least the +<filename>cx18</filename> driver provides sliced VBI data insertion +into an MPEG-2 PS in this format as well.</para> + + <para>The following definitions specify the payload of the +MPEG-2 <emphasis>Private Stream 1 PES</emphasis> packets that contain +sliced VBI data when <link linkend="v4l2-mpeg-stream-vbi-fmt"> +<constant>V4L2_MPEG_STREAM_VBI_FMT_IVTV</constant></link> is set. +(The MPEG-2 <emphasis>Private Stream 1 PES</emphasis> packet header +and encapsulating MPEG-2 <emphasis>Program Pack</emphasis> header are +not detailed here. Please refer to the MPEG-2 specifications for +details on those packet headers.)</para> + + <para>The payload of the MPEG-2 <emphasis>Private Stream 1 PES +</emphasis> packets that contain sliced VBI data is specified by +&v4l2-mpeg-vbi-fmt-ivtv;. The payload is variable +length, depending on the actual number of lines of sliced VBI data +present in a video frame. The payload may be padded at the end with +unspecified fill bytes to align the end of the payload to a 4-byte +boundary. The payload shall never exceed 1552 bytes (2 fields with +18 lines/field with 43 bytes of data/line and a 4 byte magic number). +</para> + + <table frame="none" pgwide="1" id="v4l2-mpeg-vbi-fmt-ivtv"> + <title>struct <structname>v4l2_mpeg_vbi_fmt_ivtv</structname> + </title> + <tgroup cols="4"> + &cs-ustr; + <tbody valign="top"> + <row> + <entry>__u8</entry> + <entry><structfield>magic</structfield>[4]</entry> + <entry></entry> + <entry>A "magic" constant from <xref + linkend="v4l2-mpeg-vbi-fmt-ivtv-magic" /> that indicates +this is a valid sliced VBI data payload and also indicates which +member of the anonymous union, <structfield>itv0</structfield> or +<structfield>ITV0</structfield>, to use for the payload data.</entry> + </row> + <row> + <entry>union</entry> + <entry>(anonymous)</entry> + </row> + <row> + <entry></entry> + <entry>struct <link linkend="v4l2-mpeg-vbi-itv0"> + <structname>v4l2_mpeg_vbi_itv0</structname></link> + </entry> + <entry><structfield>itv0</structfield></entry> + <entry>The primary form of the sliced VBI data payload +that contains anywhere from 1 to 35 lines of sliced VBI data. +Line masks are provided in this form of the payload indicating +which VBI lines are provided.</entry> + </row> + <row> + <entry></entry> + <entry>struct <link linkend="v4l2-mpeg-vbi-itv0-1"> + <structname>v4l2_mpeg_vbi_ITV0</structname></link> + </entry> + <entry><structfield>ITV0</structfield></entry> + <entry>An alternate form of the sliced VBI data payload +used when 36 lines of sliced VBI data are present. No line masks are +provided in this form of the payload; all valid line mask bits are +implcitly set.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table frame="none" pgwide="1" id="v4l2-mpeg-vbi-fmt-ivtv-magic"> + <title>Magic Constants for &v4l2-mpeg-vbi-fmt-ivtv; + <structfield>magic</structfield> field</title> + <tgroup cols="3"> + &cs-def; + <thead> + <row> + <entry align="left">Defined Symbol</entry> + <entry align="left">Value</entry> + <entry align="left">Description</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry><constant>V4L2_MPEG_VBI_IVTV_MAGIC0</constant> + </entry> + <entry>"itv0"</entry> + <entry>Indicates the <structfield>itv0</structfield> +member of the union in &v4l2-mpeg-vbi-fmt-ivtv; is valid.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VBI_IVTV_MAGIC1</constant> + </entry> + <entry>"ITV0"</entry> + <entry>Indicates the <structfield>ITV0</structfield> +member of the union in &v4l2-mpeg-vbi-fmt-ivtv; is valid and +that 36 lines of sliced VBI data are present.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table frame="none" pgwide="1" id="v4l2-mpeg-vbi-itv0"> + <title>struct <structname>v4l2_mpeg_vbi_itv0</structname> + </title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__le32</entry> + <entry><structfield>linemask</structfield>[2]</entry> + <entry><para>Bitmasks indicating the VBI service lines +present. These <structfield>linemask</structfield> values are stored +in little endian byte order in the MPEG stream. Some reference +<structfield>linemask</structfield> bit positions with their +corresponding VBI line number and video field are given below. +b<subscript>0</subscript> indicates the least significant bit of a +<structfield>linemask</structfield> value:<screen> +<structfield>linemask</structfield>[0] b<subscript>0</subscript>: line 6 first field +<structfield>linemask</structfield>[0] b<subscript>17</subscript>: line 23 first field +<structfield>linemask</structfield>[0] b<subscript>18</subscript>: line 6 second field +<structfield>linemask</structfield>[0] b<subscript>31</subscript>: line 19 second field +<structfield>linemask</structfield>[1] b<subscript>0</subscript>: line 20 second field +<structfield>linemask</structfield>[1] b<subscript>3</subscript>: line 23 second field +<structfield>linemask</structfield>[1] b<subscript>4</subscript>-b<subscript>31</subscript>: unused and set to 0</screen></para></entry> + </row> + <row> + <entry>struct <link linkend="v4l2-mpeg-vbi-itv0-line"> + <structname>v4l2_mpeg_vbi_itv0_line</structname></link> + </entry> + <entry><structfield>line</structfield>[35]</entry> + <entry>This is a variable length array that holds from 1 +to 35 lines of sliced VBI data. The sliced VBI data lines present +correspond to the bits set in the <structfield>linemask</structfield> +array, starting from b<subscript>0</subscript> of <structfield> +linemask</structfield>[0] up through b<subscript>31</subscript> of +<structfield>linemask</structfield>[0], and from b<subscript>0 +</subscript> of <structfield>linemask</structfield>[1] up through b +<subscript>3</subscript> of <structfield>linemask</structfield>[1]. +<structfield>line</structfield>[0] corresponds to the first bit +found set in the <structfield>linemask</structfield> array, +<structfield>line</structfield>[1] corresponds to the second bit +found set in the <structfield>linemask</structfield> array, etc. +If no <structfield>linemask</structfield> array bits are set, then +<structfield>line</structfield>[0] may contain one line of +unspecified data that should be ignored by applications.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table frame="none" pgwide="1" id="v4l2-mpeg-vbi-itv0-1"> + <title>struct <structname>v4l2_mpeg_vbi_ITV0</structname> + </title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>struct <link linkend="v4l2-mpeg-vbi-itv0-line"> + <structname>v4l2_mpeg_vbi_itv0_line</structname></link> + </entry> + <entry><structfield>line</structfield>[36]</entry> + <entry>A fixed length array of 36 lines of sliced VBI +data. <structfield>line</structfield>[0] through <structfield>line +</structfield>[17] correspond to lines 6 through 23 of the +first field. <structfield>line</structfield>[18] through +<structfield>line</structfield>[35] corresponds to lines 6 +through 23 of the second field.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table frame="none" pgwide="1" id="v4l2-mpeg-vbi-itv0-line"> + <title>struct <structname>v4l2_mpeg_vbi_itv0_line</structname> + </title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u8</entry> + <entry><structfield>id</structfield></entry> + <entry>A line identifier value from +<xref linkend="ITV0-Line-Identifier-Constants" /> that indicates +the type of sliced VBI data stored on this line.</entry> + </row> + <row> + <entry>__u8</entry> + <entry><structfield>data</structfield>[42]</entry> + <entry>The sliced VBI data for the line.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table frame="none" pgwide="1" id="ITV0-Line-Identifier-Constants"> + <title>Line Identifiers for struct <link + linkend="v4l2-mpeg-vbi-itv0-line"><structname> +v4l2_mpeg_vbi_itv0_line</structname></link> <structfield>id +</structfield> field</title> + <tgroup cols="3"> + &cs-def; + <thead> + <row> + <entry align="left">Defined Symbol</entry> + <entry align="left">Value</entry> + <entry align="left">Description</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry><constant>V4L2_MPEG_VBI_IVTV_TELETEXT_B</constant> + </entry> + <entry>1</entry> + <entry>Refer to <link linkend="vbi-services2"> +Sliced VBI services</link> for a description of the line payload.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VBI_IVTV_CAPTION_525</constant> + </entry> + <entry>4</entry> + <entry>Refer to <link linkend="vbi-services2"> +Sliced VBI services</link> for a description of the line payload.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VBI_IVTV_WSS_625</constant> + </entry> + <entry>5</entry> + <entry>Refer to <link linkend="vbi-services2"> +Sliced VBI services</link> for a description of the line payload.</entry> + </row> + <row> + <entry><constant>V4L2_MPEG_VBI_IVTV_VPS</constant> + </entry> + <entry>7</entry> + <entry>Refer to <link linkend="vbi-services2"> +Sliced VBI services</link> for a description of the line payload.</entry> + </row> + </tbody> + </tgroup> + </table> + + </section> + </section> diff --git a/Documentation/DocBook/media/v4l/dev-subdev.xml b/Documentation/DocBook/media/v4l/dev-subdev.xml new file mode 100644 index 00000000000..d15aaf83f56 --- /dev/null +++ b/Documentation/DocBook/media/v4l/dev-subdev.xml @@ -0,0 +1,467 @@ + <title>Sub-device Interface</title> + + <note> + <title>Experimental</title> + <para>This is an <link linkend="experimental">experimental</link> + interface and may change in the future.</para> + </note> + + <para>The complex nature of V4L2 devices, where hardware is often made of + several integrated circuits that need to interact with each other in a + controlled way, leads to complex V4L2 drivers. The drivers usually reflect + the hardware model in software, and model the different hardware components + as software blocks called sub-devices.</para> + + <para>V4L2 sub-devices are usually kernel-only objects. If the V4L2 driver + implements the media device API, they will automatically inherit from media + entities. Applications will be able to enumerate the sub-devices and discover + the hardware topology using the media entities, pads and links enumeration + API.</para> + + <para>In addition to make sub-devices discoverable, drivers can also choose + to make them directly configurable by applications. When both the sub-device + driver and the V4L2 device driver support this, sub-devices will feature a + character device node on which ioctls can be called to + <itemizedlist> + <listitem><para>query, read and write sub-devices controls</para></listitem> + <listitem><para>subscribe and unsubscribe to events and retrieve them</para></listitem> + <listitem><para>negotiate image formats on individual pads</para></listitem> + </itemizedlist> + </para> + + <para>Sub-device character device nodes, conventionally named + <filename>/dev/v4l-subdev*</filename>, use major number 81.</para> + + <section> + <title>Controls</title> + <para>Most V4L2 controls are implemented by sub-device hardware. Drivers + usually merge all controls and expose them through video device nodes. + Applications can control all sub-devices through a single interface.</para> + + <para>Complex devices sometimes implement the same control in different + pieces of hardware. This situation is common in embedded platforms, where + both sensors and image processing hardware implement identical functions, + such as contrast adjustment, white balance or faulty pixels correction. As + the V4L2 controls API doesn't support several identical controls in a single + device, all but one of the identical controls are hidden.</para> + + <para>Applications can access those hidden controls through the sub-device + node with the V4L2 control API described in <xref linkend="control" />. The + ioctls behave identically as when issued on V4L2 device nodes, with the + exception that they deal only with controls implemented in the sub-device. + </para> + + <para>Depending on the driver, those controls might also be exposed through + one (or several) V4L2 device nodes.</para> + </section> + + <section> + <title>Events</title> + <para>V4L2 sub-devices can notify applications of events as described in + <xref linkend="event" />. The API behaves identically as when used on V4L2 + device nodes, with the exception that it only deals with events generated by + the sub-device. Depending on the driver, those events might also be reported + on one (or several) V4L2 device nodes.</para> + </section> + + <section id="pad-level-formats"> + <title>Pad-level Formats</title> + + <warning><para>Pad-level formats are only applicable to very complex device that + need to expose low-level format configuration to user space. Generic V4L2 + applications do <emphasis>not</emphasis> need to use the API described in + this section.</para></warning> + + <note><para>For the purpose of this section, the term + <wordasword>format</wordasword> means the combination of media bus data + format, frame width and frame height.</para></note> + + <para>Image formats are typically negotiated on video capture and + output devices using the format and <link + linkend="vidioc-subdev-g-selection">selection</link> ioctls. The + driver is responsible for configuring every block in the video + pipeline according to the requested format at the pipeline input + and/or output.</para> + + <para>For complex devices, such as often found in embedded systems, + identical image sizes at the output of a pipeline can be achieved using + different hardware configurations. One such example is shown on + <xref linkend="pipeline-scaling" />, where + image scaling can be performed on both the video sensor and the host image + processing hardware.</para> + + <figure id="pipeline-scaling"> + <title>Image Format Negotiation on Pipelines</title> + <mediaobject> + <imageobject> + <imagedata fileref="pipeline.pdf" format="PS" /> + </imageobject> + <imageobject> + <imagedata fileref="pipeline.png" format="PNG" /> + </imageobject> + <textobject> + <phrase>High quality and high speed pipeline configuration</phrase> + </textobject> + </mediaobject> + </figure> + + <para>The sensor scaler is usually of less quality than the host scaler, but + scaling on the sensor is required to achieve higher frame rates. Depending + on the use case (quality vs. speed), the pipeline must be configured + differently. Applications need to configure the formats at every point in + the pipeline explicitly.</para> + + <para>Drivers that implement the <link linkend="media-controller-intro">media + API</link> can expose pad-level image format configuration to applications. + When they do, applications can use the &VIDIOC-SUBDEV-G-FMT; and + &VIDIOC-SUBDEV-S-FMT; ioctls. to negotiate formats on a per-pad basis.</para> + + <para>Applications are responsible for configuring coherent parameters on + the whole pipeline and making sure that connected pads have compatible + formats. The pipeline is checked for formats mismatch at &VIDIOC-STREAMON; + time, and an &EPIPE; is then returned if the configuration is + invalid.</para> + + <para>Pad-level image format configuration support can be tested by calling + the &VIDIOC-SUBDEV-G-FMT; ioctl on pad 0. If the driver returns an &EINVAL; + pad-level format configuration is not supported by the sub-device.</para> + + <section> + <title>Format Negotiation</title> + + <para>Acceptable formats on pads can (and usually do) depend on a number + of external parameters, such as formats on other pads, active links, or + even controls. Finding a combination of formats on all pads in a video + pipeline, acceptable to both application and driver, can't rely on formats + enumeration only. A format negotiation mechanism is required.</para> + + <para>Central to the format negotiation mechanism are the get/set format + operations. When called with the <structfield>which</structfield> argument + set to <constant>V4L2_SUBDEV_FORMAT_TRY</constant>, the + &VIDIOC-SUBDEV-G-FMT; and &VIDIOC-SUBDEV-S-FMT; ioctls operate on a set of + formats parameters that are not connected to the hardware configuration. + Modifying those 'try' formats leaves the device state untouched (this + applies to both the software state stored in the driver and the hardware + state stored in the device itself).</para> + + <para>While not kept as part of the device state, try formats are stored + in the sub-device file handles. A &VIDIOC-SUBDEV-G-FMT; call will return + the last try format set <emphasis>on the same sub-device file + handle</emphasis>. Several applications querying the same sub-device at + the same time will thus not interact with each other.</para> + + <para>To find out whether a particular format is supported by the device, + applications use the &VIDIOC-SUBDEV-S-FMT; ioctl. Drivers verify and, if + needed, change the requested <structfield>format</structfield> based on + device requirements and return the possibly modified value. Applications + can then choose to try a different format or accept the returned value and + continue.</para> + + <para>Formats returned by the driver during a negotiation iteration are + guaranteed to be supported by the device. In particular, drivers guarantee + that a returned format will not be further changed if passed to an + &VIDIOC-SUBDEV-S-FMT; call as-is (as long as external parameters, such as + formats on other pads or links' configuration are not changed).</para> + + <para>Drivers automatically propagate formats inside sub-devices. When a + try or active format is set on a pad, corresponding formats on other pads + of the same sub-device can be modified by the driver. Drivers are free to + modify formats as required by the device. However, they should comply with + the following rules when possible: + <itemizedlist> + <listitem><para>Formats should be propagated from sink pads to source pads. + Modifying a format on a source pad should not modify the format on any + sink pad.</para></listitem> + <listitem><para>Sub-devices that scale frames using variable scaling factors + should reset the scale factors to default values when sink pads formats + are modified. If the 1:1 scaling ratio is supported, this means that + source pads formats should be reset to the sink pads formats.</para></listitem> + </itemizedlist> + </para> + + <para>Formats are not propagated across links, as that would involve + propagating them from one sub-device file handle to another. Applications + must then take care to configure both ends of every link explicitly with + compatible formats. Identical formats on the two ends of a link are + guaranteed to be compatible. Drivers are free to accept different formats + matching device requirements as being compatible.</para> + + <para><xref linkend="sample-pipeline-config" /> + shows a sample configuration sequence for the pipeline described in + <xref linkend="pipeline-scaling" /> (table + columns list entity names and pad numbers).</para> + + <table pgwide="0" frame="none" id="sample-pipeline-config"> + <title>Sample Pipeline Configuration</title> + <tgroup cols="3"> + <colspec colname="what"/> + <colspec colname="sensor-0" /> + <colspec colname="frontend-0" /> + <colspec colname="frontend-1" /> + <colspec colname="scaler-0" /> + <colspec colname="scaler-1" /> + <thead> + <row> + <entry></entry> + <entry>Sensor/0</entry> + <entry>Frontend/0</entry> + <entry>Frontend/1</entry> + <entry>Scaler/0</entry> + <entry>Scaler/1</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry>Initial state</entry> + <entry>2048x1536</entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + </row> + <row> + <entry>Configure frontend input</entry> + <entry>2048x1536</entry> + <entry><emphasis>2048x1536</emphasis></entry> + <entry><emphasis>2046x1534</emphasis></entry> + <entry>-</entry> + <entry>-</entry> + </row> + <row> + <entry>Configure scaler input</entry> + <entry>2048x1536</entry> + <entry>2048x1536</entry> + <entry>2046x1534</entry> + <entry><emphasis>2046x1534</emphasis></entry> + <entry><emphasis>2046x1534</emphasis></entry> + </row> + <row> + <entry>Configure scaler output</entry> + <entry>2048x1536</entry> + <entry>2048x1536</entry> + <entry>2046x1534</entry> + <entry>2046x1534</entry> + <entry><emphasis>1280x960</emphasis></entry> + </row> + </tbody> + </tgroup> + </table> + + <para> + <orderedlist> + <listitem><para>Initial state. The sensor output is set to its native 3MP + resolution. Resolutions on the host frontend and scaler input and output + pads are undefined.</para></listitem> + <listitem><para>The application configures the frontend input pad resolution to + 2048x1536. The driver propagates the format to the frontend output pad. + Note that the propagated output format can be different, as in this case, + than the input format, as the hardware might need to crop pixels (for + instance when converting a Bayer filter pattern to RGB or YUV).</para></listitem> + <listitem><para>The application configures the scaler input pad resolution to + 2046x1534 to match the frontend output resolution. The driver propagates + the format to the scaler output pad.</para></listitem> + <listitem><para>The application configures the scaler output pad resolution to + 1280x960.</para></listitem> + </orderedlist> + </para> + + <para>When satisfied with the try results, applications can set the active + formats by setting the <structfield>which</structfield> argument to + <constant>V4L2_SUBDEV_FORMAT_ACTIVE</constant>. Active formats are changed + exactly as try formats by drivers. To avoid modifying the hardware state + during format negotiation, applications should negotiate try formats first + and then modify the active settings using the try formats returned during + the last negotiation iteration. This guarantees that the active format + will be applied as-is by the driver without being modified. + </para> + </section> + + <section id="v4l2-subdev-selections"> + <title>Selections: cropping, scaling and composition</title> + + <para>Many sub-devices support cropping frames on their input or output + pads (or possible even on both). Cropping is used to select the area of + interest in an image, typically on an image sensor or a video decoder. It can + also be used as part of digital zoom implementations to select the area of + the image that will be scaled up.</para> + + <para>Crop settings are defined by a crop rectangle and represented in a + &v4l2-rect; by the coordinates of the top left corner and the rectangle + size. Both the coordinates and sizes are expressed in pixels.</para> + + <para>As for pad formats, drivers store try and active + rectangles for the selection targets <xref + linkend="v4l2-selections-common" />.</para> + + <para>On sink pads, cropping is applied relative to the + current pad format. The pad format represents the image size as + received by the sub-device from the previous block in the + pipeline, and the crop rectangle represents the sub-image that + will be transmitted further inside the sub-device for + processing.</para> + + <para>The scaling operation changes the size of the image by + scaling it to new dimensions. The scaling ratio isn't specified + explicitly, but is implied from the original and scaled image + sizes. Both sizes are represented by &v4l2-rect;.</para> + + <para>Scaling support is optional. When supported by a subdev, + the crop rectangle on the subdev's sink pad is scaled to the + size configured using the &VIDIOC-SUBDEV-S-SELECTION; IOCTL + using <constant>V4L2_SEL_TGT_COMPOSE</constant> + selection target on the same pad. If the subdev supports scaling + but not composing, the top and left values are not used and must + always be set to zero.</para> + + <para>On source pads, cropping is similar to sink pads, with the + exception that the source size from which the cropping is + performed, is the COMPOSE rectangle on the sink pad. In both + sink and source pads, the crop rectangle must be entirely + contained inside the source image size for the crop + operation.</para> + + <para>The drivers should always use the closest possible + rectangle the user requests on all selection targets, unless + specifically told otherwise. + <constant>V4L2_SEL_FLAG_GE</constant> and + <constant>V4L2_SEL_FLAG_LE</constant> flags may be + used to round the image size either up or down. <xref + linkend="v4l2-selection-flags" /></para> + </section> + + <section> + <title>Types of selection targets</title> + + <section> + <title>Actual targets</title> + + <para>Actual targets (without a postfix) reflect the actual + hardware configuration at any point of time. There is a BOUNDS + target corresponding to every actual target.</para> + </section> + + <section> + <title>BOUNDS targets</title> + + <para>BOUNDS targets is the smallest rectangle that contains all + valid actual rectangles. It may not be possible to set the actual + rectangle as large as the BOUNDS rectangle, however. This may be + because e.g. a sensor's pixel array is not rectangular but + cross-shaped or round. The maximum size may also be smaller than the + BOUNDS rectangle.</para> + </section> + + </section> + + <section> + <title>Order of configuration and format propagation</title> + + <para>Inside subdevs, the order of image processing steps will + always be from the sink pad towards the source pad. This is also + reflected in the order in which the configuration must be + performed by the user: the changes made will be propagated to + any subsequent stages. If this behaviour is not desired, the + user must set + <constant>V4L2_SEL_FLAG_KEEP_CONFIG</constant> flag. This + flag causes no propagation of the changes are allowed in any + circumstances. This may also cause the accessed rectangle to be + adjusted by the driver, depending on the properties of the + underlying hardware.</para> + + <para>The coordinates to a step always refer to the actual size + of the previous step. The exception to this rule is the source + compose rectangle, which refers to the sink compose bounds + rectangle --- if it is supported by the hardware.</para> + + <orderedlist> + <listitem><para>Sink pad format. The user configures the sink pad + format. This format defines the parameters of the image the + entity receives through the pad for further processing.</para></listitem> + + <listitem><para>Sink pad actual crop selection. The sink pad crop + defines the crop performed to the sink pad format.</para></listitem> + + <listitem><para>Sink pad actual compose selection. The size of the + sink pad compose rectangle defines the scaling ratio compared + to the size of the sink pad crop rectangle. The location of + the compose rectangle specifies the location of the actual + sink compose rectangle in the sink compose bounds + rectangle.</para></listitem> + + <listitem><para>Source pad actual crop selection. Crop on the source + pad defines crop performed to the image in the sink compose + bounds rectangle.</para></listitem> + + <listitem><para>Source pad format. The source pad format defines the + output pixel format of the subdev, as well as the other + parameters with the exception of the image width and height. + Width and height are defined by the size of the source pad + actual crop selection.</para></listitem> + </orderedlist> + + <para>Accessing any of the above rectangles not supported by the + subdev will return <constant>EINVAL</constant>. Any rectangle + referring to a previous unsupported rectangle coordinates will + instead refer to the previous supported rectangle. For example, + if sink crop is not supported, the compose selection will refer + to the sink pad format dimensions instead.</para> + + <figure id="subdev-image-processing-crop"> + <title>Image processing in subdevs: simple crop example</title> + <mediaobject> + <imageobject> + <imagedata fileref="subdev-image-processing-crop.svg" + format="SVG" scale="200" /> + </imageobject> + </mediaobject> + </figure> + + <para>In the above example, the subdev supports cropping on its + sink pad. To configure it, the user sets the media bus format on + the subdev's sink pad. Now the actual crop rectangle can be set + on the sink pad --- the location and size of this rectangle + reflect the location and size of a rectangle to be cropped from + the sink format. The size of the sink crop rectangle will also + be the size of the format of the subdev's source pad.</para> + + <figure id="subdev-image-processing-scaling-multi-source"> + <title>Image processing in subdevs: scaling with multiple sources</title> + <mediaobject> + <imageobject> + <imagedata fileref="subdev-image-processing-scaling-multi-source.svg" + format="SVG" scale="200" /> + </imageobject> + </mediaobject> + </figure> + + <para>In this example, the subdev is capable of first cropping, + then scaling and finally cropping for two source pads + individually from the resulting scaled image. The location of + the scaled image in the cropped image is ignored in sink compose + target. Both of the locations of the source crop rectangles + refer to the sink scaling rectangle, independently cropping an + area at location specified by the source crop rectangle from + it.</para> + + <figure id="subdev-image-processing-full"> + <title>Image processing in subdevs: scaling and composition + with multiple sinks and sources</title> + <mediaobject> + <imageobject> + <imagedata fileref="subdev-image-processing-full.svg" + format="SVG" scale="200" /> + </imageobject> + </mediaobject> + </figure> + + <para>The subdev driver supports two sink pads and two source + pads. The images from both of the sink pads are individually + cropped, then scaled and further composed on the composition + bounds rectangle. From that, two independent streams are cropped + and sent out of the subdev from the source pads.</para> + + </section> + + </section> + + &sub-subdev-formats; diff --git a/Documentation/DocBook/media/v4l/dev-teletext.xml b/Documentation/DocBook/media/v4l/dev-teletext.xml new file mode 100644 index 00000000000..bd21c64d70f --- /dev/null +++ b/Documentation/DocBook/media/v4l/dev-teletext.xml @@ -0,0 +1,29 @@ + <title>Teletext Interface</title> + + <para>This interface was aimed at devices receiving and demodulating +Teletext data [<xref linkend="ets300706" />, <xref linkend="itu653" />], evaluating the +Teletext packages and storing formatted pages in cache memory. Such +devices are usually implemented as microcontrollers with serial +interface (I<superscript>2</superscript>C) and could be found on old +TV cards, dedicated Teletext decoding cards and home-brew devices +connected to the PC parallel port.</para> + + <para>The Teletext API was designed by Martin Buck. It was defined in +the kernel header file <filename>linux/videotext.h</filename>, the +specification is available from <ulink url="ftp://ftp.gwdg.de/pub/linux/misc/videotext/"> +ftp://ftp.gwdg.de/pub/linux/misc/videotext/</ulink>. (Videotext is the name of +the German public television Teletext service.)</para> + + <para>Eventually the Teletext API was integrated into the V4L API +with character device file names <filename>/dev/vtx0</filename> to +<filename>/dev/vtx31</filename>, device major number 81, minor numbers +192 to 223.</para> + + <para>However, teletext decoders were quickly replaced by more +generic VBI demodulators and those dedicated teletext decoders no longer exist. +For many years the vtx devices were still around, even though nobody used +them. So the decision was made to finally remove support for the Teletext API in +kernel 2.6.37.</para> + + <para>Modern devices all use the <link linkend="raw-vbi">raw</link> or +<link linkend="sliced">sliced</link> VBI API.</para> diff --git a/Documentation/DocBook/media/v4l/driver.xml b/Documentation/DocBook/media/v4l/driver.xml new file mode 100644 index 00000000000..7c6638baced --- /dev/null +++ b/Documentation/DocBook/media/v4l/driver.xml @@ -0,0 +1,200 @@ + <title>V4L2 Driver Programming</title> + + <!-- This part defines the interface between the "videodev" + module and individual drivers. --> + + <para>to do</para> +<!-- + <para>V4L2 is a two-layer driver system. The top layer is the "videodev" +kernel module. When videodev initializes it registers as character device +with major number 81, and it registers a set of file operations. All V4L2 +drivers are really clients of videodev, which calls V4L2 drivers through +driver method functions. V4L2 drivers are also written as kernel modules. +After probing the hardware they register one or more devices with +videodev.</para> + + <section id="driver-modules"> + <title>Driver Modules</title> + + <para>V4L2 driver modules must have an initialization function which is +called after the module was loaded into kernel, an exit function whis is +called before the module is removed. When the driver is compiled into the +kernel these functions called at system boot and shutdown time.</para> + + <informalexample> + <programlisting> +#include <linux/module.h> + +/* Export information about this module. For details and other useful + macros see <filename>linux/module.h</filename>. */ +MODULE_DESCRIPTION("my - driver for my hardware"); +MODULE_AUTHOR("Your name here"); +MODULE_LICENSE("GPL"); + +static void +my_module_exit (void) +{ + /* Free all resources allocated by my_module_init(). */ +} + +static int +my_module_init (void) +{ + /* Bind the driver to the supported hardware, see + <link linkend="driver-pci"> and + <link linkend="driver-usb"> for examples. */ + + return 0; /* a negative value on error, 0 on success. */ +} + +/* Export module functions. */ +module_init (my_module_init); +module_exit (my_module_exit); +</programlisting> + </informalexample> + + <para>Users can add parameters when kernel modules are inserted:</para> + + <informalexample> + <programlisting> +include <linux/moduleparam.h> + +static int my_option = 123; +static int my_option_array[47]; + +/* Export the symbol, an int, with access permissions 0664. + See <filename>linux/moduleparam.h</filename> for other types. */ +module_param (my_option, int, 0644); +module_param_array (my_option_array, int, NULL, 0644); + +MODULE_PARM_DESC (my_option, "Does magic things, default 123"); +</programlisting> + </informalexample> + + <para>One parameter should be supported by all V4L2 drivers, the minor +number of the device it will register. Purpose is to predictably link V4L2 +drivers to device nodes if more than one video device is installed. Use the +name of the device node followed by a "_nr" suffix, for example "video_nr" +for <filename>/dev/video</filename>.</para> + + <informalexample> + <programlisting> +/* Minor number of the device, -1 to allocate the first unused. */ +static int video_nr = -1; + +module_param (video_nr, int, 0444); +</programlisting> + </informalexample> + </section> + + <section id="driver-pci"> + <title>PCI Devices</title> + + <para>PCI devices are initialized like this:</para> + + <informalexample> + <programlisting> +typedef struct { + /* State of one physical device. */ +} my_device; + +static int +my_resume (struct pci_dev * pci_dev) +{ + /* Restore the suspended device to working state. */ +} + +static int +my_suspend (struct pci_dev * pci_dev, + pm_message_t state) +{ + /* This function is called before the system goes to sleep. + Stop all DMAs and disable interrupts, then put the device + into a low power state. For details see the kernel + sources under <filename>Documentation/power</filename>. */ + + return 0; /* a negative value on error, 0 on success. */ +} + +static void +my_remove (struct pci_dev * pci_dev) +{ + my_device *my = pci_get_drvdata (pci_dev); + + /* Describe me. */ +} + +static int +my_probe (struct pci_dev * pci_dev, + const struct pci_device_id * pci_id) +{ + my_device *my; + + /* Describe me. */ + + /* You can allocate per-device data here and store a pointer + to it in the pci_dev structure. */ + my = ...; + pci_set_drvdata (pci_dev, my); + + return 0; /* a negative value on error, 0 on success. */ +} + +/* A list of supported PCI devices. */ +static struct pci_device_id +my_pci_device_ids [] = { + { PCI_VENDOR_ID_FOO, PCI_DEVICE_ID_BAR, + PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 }, + { 0 } /* end of list */ +}; + +/* Load our module if supported PCI devices are installed. */ +MODULE_DEVICE_TABLE (pci, my_pci_device_ids); + +static struct pci_driver +my_pci_driver = { + .name = "my", + .id_table = my_pci_device_ids, + + .probe = my_probe, + .remove = my_remove, + + /* Power management functions. */ + .suspend = my_suspend, + .resume = my_resume, +}; + +static void +my_module_exit (void) +{ + pci_unregister_driver (&my_pci_driver); +} + +static int +my_module_init (void) +{ + return pci_register_driver (&my_pci_driver); +} +</programlisting> + </informalexample> + </section> + + <section id="driver-usb"> + <title>USB Devices</title> + <para>to do</para> + </section> + <section id="driver-registering"> + <title>Registering V4L2 Drivers</title> + + <para>After a V4L2 driver probed the hardware it registers one or more +devices with the videodev module.</para> + </section> + <section id="driver-file-ops"> + <title>File Operations</title> + <para>to do</para> + </section> + <section id="driver-internal-api"> + <title>Internal API</title> + <para>to do</para> + </section> +--> diff --git a/Documentation/DocBook/media/v4l/fdl-appendix.xml b/Documentation/DocBook/media/v4l/fdl-appendix.xml new file mode 100644 index 00000000000..ae22394ba99 --- /dev/null +++ b/Documentation/DocBook/media/v4l/fdl-appendix.xml @@ -0,0 +1,671 @@ +<!-- + The GNU Free Documentation License 1.1 in DocBook + Markup by Eric Baudais <baudais@okstate.edu> + Maintained by the GNOME Documentation Project + http://live.gnome.org/DocumentationProject + Version: 1.0.1 + Last Modified: Nov 16, 2000 +--> + +<appendix id="fdl"> + <appendixinfo> + <releaseinfo> + Version 1.1, March 2000 + </releaseinfo> + <copyright> + <year>2000</year><holder>Free Software Foundation, Inc.</holder> + </copyright> + <legalnotice id="fdl-legalnotice"> + <para> + <address>Free Software Foundation, Inc. <street>59 Temple Place, + Suite 330</street>, <city>Boston</city>, <state>MA</state> + <postcode>02111-1307</postcode> <country>USA</country></address> + Everyone is permitted to copy and distribute verbatim copies of this + license document, but changing it is not allowed. + </para> + </legalnotice> + </appendixinfo> + <title>GNU Free Documentation License</title> + + <sect1 id="fdl-preamble"> + <title>0. PREAMBLE</title> + <para> + The purpose of this License is to make a manual, textbook, or + other written document <quote>free</quote> in the sense of + freedom: to assure everyone the effective freedom to copy and + redistribute it, with or without modifying it, either + commercially or noncommercially. Secondarily, this License + preserves for the author and publisher a way to get credit for + their work, while not being considered responsible for + modifications made by others. + </para> + + <para> + This License is a kind of <quote>copyleft</quote>, which means + that derivative works of the document must themselves be free in + the same sense. It complements the GNU General Public License, + which is a copyleft license designed for free software. + </para> + + <para> + We have designed this License in order to use it for manuals for + free software, because free software needs free documentation: a + free program should come with manuals providing the same + freedoms that the software does. But this License is not limited + to software manuals; it can be used for any textual work, + regardless of subject matter or whether it is published as a + printed book. We recommend this License principally for works + whose purpose is instruction or reference. + </para> + </sect1> + <sect1 id="fdl-section1"> + <title>1. APPLICABILITY AND DEFINITIONS</title> + <para id="fdl-document"> + This License applies to any manual or other work that contains a + notice placed by the copyright holder saying it can be + distributed under the terms of this License. The + <quote>Document</quote>, below, refers to any such manual or + work. Any member of the public is a licensee, and is addressed + as <quote>you</quote>. + </para> + + <para id="fdl-modified"> + A <quote>Modified Version</quote> of the Document means any work + containing the Document or a portion of it, either copied + verbatim, or with modifications and/or translated into another + language. + </para> + + <para id="fdl-secondary"> + A <quote>Secondary Section</quote> is a named appendix or a + front-matter section of the <link + linkend="fdl-document">Document</link> that deals exclusively + with the relationship of the publishers or authors of the + Document to the Document's overall subject (or to related + matters) and contains nothing that could fall directly within + that overall subject. (For example, if the Document is in part a + textbook of mathematics, a Secondary Section may not explain any + mathematics.) The relationship could be a matter of historical + connection with the subject or with related matters, or of + legal, commercial, philosophical, ethical or political position + regarding them. + </para> + + <para id="fdl-invariant"> + The <quote>Invariant Sections</quote> are certain <link + linkend="fdl-secondary"> Secondary Sections</link> whose titles + are designated, as being those of Invariant Sections, in the + notice that says that the <link + linkend="fdl-document">Document</link> is released under this + License. + </para> + + <para id="fdl-cover-texts"> + The <quote>Cover Texts</quote> are certain short passages of + text that are listed, as Front-Cover Texts or Back-Cover Texts, + in the notice that says that the <link + linkend="fdl-document">Document</link> is released under this + License. + </para> + + <para id="fdl-transparent"> + A <quote>Transparent</quote> copy of the <link + linkend="fdl-document"> Document</link> means a machine-readable + copy, represented in a format whose specification is available + to the general public, whose contents can be viewed and edited + directly and straightforwardly with generic text editors or (for + images composed of pixels) generic paint programs or (for + drawings) some widely available drawing editor, and that is + suitable for input to text formatters or for automatic + translation to a variety of formats suitable for input to text + formatters. A copy made in an otherwise Transparent file format + whose markup has been designed to thwart or discourage + subsequent modification by readers is not Transparent. A copy + that is not <quote>Transparent</quote> is called + <quote>Opaque</quote>. + </para> + + <para> + Examples of suitable formats for Transparent copies include + plain ASCII without markup, Texinfo input format, LaTeX input + format, SGML or XML using a publicly available DTD, and + standard-conforming simple HTML designed for human + modification. 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VERBATIM COPYING</title> + <para> + You may copy and distribute the <link + linkend="fdl-document">Document</link> in any medium, either + commercially or noncommercially, provided that this License, the + copyright notices, and the license notice saying this License + applies to the Document are reproduced in all copies, and that + you add no other conditions whatsoever to those of this + License. You may not use technical measures to obstruct or + control the reading or further copying of the copies you make or + distribute. However, you may accept compensation in exchange for + copies. If you distribute a large enough number of copies you + must also follow the conditions in <link + linkend="fdl-section3">section 3</link>. + </para> + + <para> + You may also lend copies, under the same conditions stated + above, and you may publicly display copies. + </para> + </sect1> + + <sect1 id="fdl-section3"> + <title>3. COPYING IN QUANTITY</title> + <para> + If you publish printed copies of the <link + linkend="fdl-document">Document</link> numbering more than 100, + and the Document's license notice requires <link + linkend="fdl-cover-texts">Cover Texts</link>, you must enclose + the copies in covers that carry, clearly and legibly, all these + Cover Texts: Front-Cover Texts on the front cover, and + Back-Cover Texts on the back cover. Both covers must also + clearly and legibly identify you as the publisher of these + copies. The front cover must present the full title with all + words of the title equally prominent and visible. You may add + other material on the covers in addition. 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If you use the latter option, you must take + reasonably prudent steps, when you begin distribution of Opaque + copies in quantity, to ensure that this Transparent copy will + remain thus accessible at the stated location until at least one + year after the last time you distribute an Opaque copy (directly + or through your agents or retailers) of that edition to the + public. + </para> + + <para> + It is requested, but not required, that you contact the authors + of the <link linkend="fdl-document">Document</link> well before + redistributing any large number of copies, to give them a chance + to provide you with an updated version of the Document. + </para> + </sect1> + + <sect1 id="fdl-section4"> + <title>4. 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In addition, you must do + these things in the Modified Version: + </para> + + <itemizedlist mark="opencircle"> + <listitem> + <formalpara> + <title>A</title> + <para> + Use in the <link linkend="fdl-title-page">Title + Page</link> (and on the covers, if any) a title distinct + from that of the <link + linkend="fdl-document">Document</link>, and from those of + previous versions (which should, if there were any, be + listed in the History section of the Document). You may + use the same title as a previous version if the original + publisher of that version gives permission. + </para> + </formalpara> + </listitem> + + <listitem> + <formalpara> + <title>B</title> + <para> + List on the <link linkend="fdl-title-page">Title + Page</link>, as authors, one or more persons or entities + responsible for authorship of the modifications in the + <link linkend="fdl-modified">Modified Version</link>, + together with at least five of the principal authors of + the <link linkend="fdl-document">Document</link> (all of + its principal authors, if it has less than five). + </para> + </formalpara> + </listitem> + + <listitem> + <formalpara> + <title>C</title> + <para> + State on the <link linkend="fdl-title-page">Title + Page</link> the name of the publisher of the <link + linkend="fdl-modified">Modified Version</link>, as the + publisher. + </para> + </formalpara> + </listitem> + + <listitem> + <formalpara> + <title>D</title> + <para> + Preserve all the copyright notices of the <link + linkend="fdl-document">Document</link>. + </para> + </formalpara> + </listitem> + + <listitem> + <formalpara> + <title>E</title> + <para> + Add an appropriate copyright notice for your modifications + adjacent to the other copyright notices. + </para> + </formalpara> + </listitem> + + <listitem> + <formalpara> + <title>F</title> + <para> + Include, immediately after the copyright notices, a + license notice giving the public permission to use the + <link linkend="fdl-modified">Modified Version</link> under + the terms of this License, in the form shown in the + Addendum below. + </para> + </formalpara> + </listitem> + + <listitem> + <formalpara> + <title>G</title> + <para> + Preserve in that license notice the full lists of <link + linkend="fdl-invariant"> Invariant Sections</link> and + required <link linkend="fdl-cover-texts">Cover + Texts</link> given in the <link + linkend="fdl-document">Document's</link> license notice. + </para> + </formalpara> + </listitem> + + <listitem> + <formalpara> + <title>H</title> + <para> + Include an unaltered copy of this License. + </para> + </formalpara> + </listitem> + + <listitem> + <formalpara> + <title>I</title> + <para> + Preserve the section entitled <quote>History</quote>, and + its title, and add to it an item stating at least the + title, year, new authors, and publisher of the <link + linkend="fdl-modified">Modified Version </link>as given on + the <link linkend="fdl-title-page">Title Page</link>. 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You may omit a network location for a work that + was published at least four years before the Document + itself, or if the original publisher of the version it + refers to gives permission. + </para> + </formalpara> + </listitem> + + <listitem> + <formalpara> + <title>K</title> + <para> + In any section entitled <quote>Acknowledgements</quote> or + <quote>Dedications</quote>, preserve the section's title, + and preserve in the section all the substance and tone of + each of the contributor acknowledgements and/or + dedications given therein. + </para> + </formalpara> + </listitem> + + <listitem> + <formalpara> + <title>L</title> + <para> + Preserve all the <link linkend="fdl-invariant">Invariant + Sections</link> of the <link + linkend="fdl-document">Document</link>, unaltered in their + text and in their titles. Section numbers or the + equivalent are not considered part of the section titles. + </para> + </formalpara> + </listitem> + + <listitem> + <formalpara> + <title>M</title> + <para> + Delete any section entitled + <quote>Endorsements</quote>. Such a section may not be + included in the <link linkend="fdl-modified">Modified + Version</link>. + </para> + </formalpara> + </listitem> + + <listitem> + <formalpara> + <title>N</title> + <para> + Do not retitle any existing section as + <quote>Endorsements</quote> or to conflict in title with + any <link linkend="fdl-invariant">Invariant + Section</link>. + </para> + </formalpara> + </listitem> + </itemizedlist> + + <para> + If the <link linkend="fdl-modified">Modified Version</link> + includes new front-matter sections or appendices that qualify as + <link linkend="fdl-secondary">Secondary Sections</link> and + contain no material copied from the Document, you may at your + option designate some or all of these sections as invariant. To + do this, add their titles to the list of <link + linkend="fdl-invariant">Invariant Sections</link> in the + Modified Version's license notice. These titles must be + distinct from any other section titles. + </para> + + <para> + You may add a section entitled <quote>Endorsements</quote>, + provided it contains nothing but endorsements of your <link + linkend="fdl-modified">Modified Version</link> by various + parties--for example, statements of peer review or that the text + has been approved by an organization as the authoritative + definition of a standard. + </para> + + <para> + You may add a passage of up to five words as a <link + linkend="fdl-cover-texts">Front-Cover Text</link>, and a passage + of up to 25 words as a <link + linkend="fdl-cover-texts">Back-Cover Text</link>, to the end of + the list of <link linkend="fdl-cover-texts">Cover Texts</link> + in the <link linkend="fdl-modified">Modified Version</link>. + Only one passage of Front-Cover Text and one of Back-Cover Text + may be added by (or through arrangements made by) any one + entity. If the <link linkend="fdl-document">Document</link> + already includes a cover text for the same cover, previously + added by you or by arrangement made by the same entity you are + acting on behalf of, you may not add another; but you may + replace the old one, on explicit permission from the previous + publisher that added the old one. + </para> + + <para> + The author(s) and publisher(s) of the <link + linkend="fdl-document">Document</link> do not by this License + give permission to use their names for publicity for or to + assert or imply endorsement of any <link + linkend="fdl-modified">Modified Version </link>. + </para> + </sect1> + + <sect1 id="fdl-section5"> + <title>5. COMBINING DOCUMENTS</title> + <para> + You may combine the <link linkend="fdl-document">Document</link> + with other documents released under this License, under the + terms defined in <link linkend="fdl-section4">section 4</link> + above for modified versions, provided that you include in the + combination all of the <link linkend="fdl-invariant">Invariant + Sections</link> of all of the original documents, unmodified, + and list them all as Invariant Sections of your combined work in + its license notice. + </para> + + <para> + The combined work need only contain one copy of this License, + and multiple identical <link linkend="fdl-invariant">Invariant + Sections</link> may be replaced with a single copy. If there are + multiple Invariant Sections with the same name but different + contents, make the title of each such section unique by adding + at the end of it, in parentheses, the name of the original + author or publisher of that section if known, or else a unique + number. Make the same adjustment to the section titles in the + list of Invariant Sections in the license notice of the combined + work. + </para> + + <para> + In the combination, you must combine any sections entitled + <quote>History</quote> in the various original documents, + forming one section entitled <quote>History</quote>; likewise + combine any sections entitled <quote>Acknowledgements</quote>, + and any sections entitled <quote>Dedications</quote>. You must + delete all sections entitled <quote>Endorsements.</quote> + </para> + </sect1> + + <sect1 id="fdl-section6"> + <title>6. COLLECTIONS OF DOCUMENTS</title> + <para> + You may make a collection consisting of the <link + linkend="fdl-document">Document</link> and other documents + released under this License, and replace the individual copies + of this License in the various documents with a single copy that + is included in the collection, provided that you follow the + rules of this License for verbatim copying of each of the + documents in all other respects. + </para> + + <para> + You may extract a single document from such a collection, and + dispbibute it individually under this License, provided you + insert a copy of this License into the extracted document, and + follow this License in all other respects regarding verbatim + copying of that document. + </para> + </sect1> + + <sect1 id="fdl-section7"> + <title>7. AGGREGATION WITH INDEPENDENT WORKS</title> + <para> + A compilation of the <link + linkend="fdl-document">Document</link> or its derivatives with + other separate and independent documents or works, in or on a + volume of a storage or distribution medium, does not as a whole + count as a <link linkend="fdl-modified">Modified Version</link> + of the Document, provided no compilation copyright is claimed + for the compilation. Such a compilation is called an + <quote>aggregate</quote>, and this License does not apply to the + other self-contained works thus compiled with the Document , on + account of their being thus compiled, if they are not themselves + derivative works of the Document. If the <link + linkend="fdl-cover-texts">Cover Text</link> requirement of <link + linkend="fdl-section3">section 3</link> is applicable to these + copies of the Document, then if the Document is less than one + quarter of the entire aggregate, the Document's Cover Texts may + be placed on covers that surround only the Document within the + aggregate. Otherwise they must appear on covers around the whole + aggregate. + </para> + </sect1> + + <sect1 id="fdl-section8"> + <title>8. TRANSLATION</title> + <para> + Translation is considered a kind of modification, so you may + distribute translations of the <link + linkend="fdl-document">Document</link> under the terms of <link + linkend="fdl-section4">section 4</link>. 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However, + parties who have received copies, or rights, from you under this + License will not have their licenses terminated so long as such + parties remain in full compliance. + </para> + </sect1> + + <sect1 id="fdl-section10"> + <title>10. FUTURE REVISIONS OF THIS LICENSE</title> + <para> + The <ulink type="http" + url="http://www.gnu.org/fsf/fsf.html">Free Software + Foundation</ulink> may publish new, revised versions of the GNU + Free Documentation License from time to time. Such new versions + will be similar in spirit to the present version, but may differ + in detail to address new problems or concerns. See <ulink + type="http" + url="http://www.gnu.org/copyleft">http://www.gnu.org/copyleft/</ulink>. + </para> + + <para> + Each version of the License is given a distinguishing version + number. If the <link linkend="fdl-document">Document</link> + specifies that a particular numbered version of this License + <quote>or any later version</quote> applies to it, you have the + option of following the terms and conditions either of that + specified version or of any later version that has been + published (not as a draft) by the Free Software Foundation. If + the Document does not specify a version number of this License, + you may choose any version ever published (not as a draft) by + the Free Software Foundation. + </para> + </sect1> + + <sect1 id="fdl-using"> + <title>Addendum</title> + <para> + To use this License in a document you have written, include a copy of + the License in the document and put the following copyright and + license notices just after the title page: + </para> + + <blockquote> + <para> + Copyright © YEAR YOUR NAME. + </para> + <para> + Permission is granted to copy, distribute and/or modify this + document under the terms of the GNU Free Documentation + License, Version 1.1 or any later version published by the + Free Software Foundation; with the <link + linkend="fdl-invariant">Invariant Sections</link> being LIST + THEIR TITLES, with the <link + linkend="fdl-cover-texts">Front-Cover Texts</link> being LIST, + and with the <link linkend="fdl-cover-texts">Back-Cover + Texts</link> being LIST. A copy of the license is included in + the section entitled <quote>GNU Free Documentation + License</quote>. + </para> + </blockquote> + + <para> + If you have no <link linkend="fdl-invariant">Invariant + Sections</link>, write <quote>with no Invariant Sections</quote> + instead of saying which ones are invariant. If you have no + <link linkend="fdl-cover-texts">Front-Cover Texts</link>, write + <quote>no Front-Cover Texts</quote> instead of + <quote>Front-Cover Texts being LIST</quote>; likewise for <link + linkend="fdl-cover-texts">Back-Cover Texts</link>. + </para> + + <para> + If your document contains nontrivial examples of program code, + we recommend releasing these examples in parallel under your + choice of free software license, such as the <ulink type="http" + url="http://www.gnu.org/copyleft/gpl.html"> GNU General Public + License</ulink>, to permit their use in free software. + </para> + </sect1> +</appendix> + + + + + + diff --git a/Documentation/DocBook/media/v4l/fieldseq_bt.pdf b/Documentation/DocBook/media/v4l/fieldseq_bt.pdf Binary files differnew file mode 100644 index 00000000000..26598b23f80 --- /dev/null +++ b/Documentation/DocBook/media/v4l/fieldseq_bt.pdf diff --git a/Documentation/DocBook/media/v4l/fieldseq_tb.pdf b/Documentation/DocBook/media/v4l/fieldseq_tb.pdf Binary files differnew file mode 100644 index 00000000000..4965b22ddb3 --- /dev/null +++ b/Documentation/DocBook/media/v4l/fieldseq_tb.pdf diff --git a/Documentation/DocBook/media/v4l/func-close.xml b/Documentation/DocBook/media/v4l/func-close.xml new file mode 100644 index 00000000000..232920d2f3c --- /dev/null +++ b/Documentation/DocBook/media/v4l/func-close.xml @@ -0,0 +1,62 @@ +<refentry id="func-close"> + <refmeta> + <refentrytitle>V4L2 close()</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>v4l2-close</refname> + <refpurpose>Close a V4L2 device</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcsynopsisinfo>#include <unistd.h></funcsynopsisinfo> + <funcprototype> + <funcdef>int <function>close</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>Closes the device. Any I/O in progress is terminated and +resources associated with the file descriptor are freed. However data +format parameters, current input or output, control values or other +properties remain unchanged.</para> + </refsect1> + + <refsect1> + <title>Return Value</title> + + <para>The function returns <returnvalue>0</returnvalue> on +success, <returnvalue>-1</returnvalue> on failure and the +<varname>errno</varname> is set appropriately. Possible error +codes:</para> + + <variablelist> + <varlistentry> + <term><errorcode>EBADF</errorcode></term> + <listitem> + <para><parameter>fd</parameter> is not a valid open file +descriptor.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/func-ioctl.xml b/Documentation/DocBook/media/v4l/func-ioctl.xml new file mode 100644 index 00000000000..4394184a1a6 --- /dev/null +++ b/Documentation/DocBook/media/v4l/func-ioctl.xml @@ -0,0 +1,71 @@ +<refentry id="func-ioctl"> + <refmeta> + <refentrytitle>V4L2 ioctl()</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>v4l2-ioctl</refname> + <refpurpose>Program a V4L2 device</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcsynopsisinfo>#include <sys/ioctl.h></funcsynopsisinfo> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>void *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>V4L2 ioctl request code as defined in the <filename>videodev2.h</filename> header file, for example +VIDIOC_QUERYCAP.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para>Pointer to a function parameter, usually a structure.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>The <function>ioctl()</function> function is used to program +V4L2 devices. The argument <parameter>fd</parameter> must be an open +file descriptor. An ioctl <parameter>request</parameter> has encoded +in it whether the argument is an input, output or read/write +parameter, and the size of the argument <parameter>argp</parameter> in +bytes. Macros and defines specifying V4L2 ioctl requests are located +in the <filename>videodev2.h</filename> header file. +Applications should use their own copy, not include the version in the +kernel sources on the system they compile on. All V4L2 ioctl requests, +their respective function and parameters are specified in <xref + linkend="user-func" />.</para> + </refsect1> + + <refsect1> + &return-value; + <para>When an ioctl that takes an output or read/write parameter fails, + the parameter remains unmodified.</para> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/func-mmap.xml b/Documentation/DocBook/media/v4l/func-mmap.xml new file mode 100644 index 00000000000..f31ad71bf30 --- /dev/null +++ b/Documentation/DocBook/media/v4l/func-mmap.xml @@ -0,0 +1,183 @@ +<refentry id="func-mmap"> + <refmeta> + <refentrytitle>V4L2 mmap()</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>v4l2-mmap</refname> + <refpurpose>Map device memory into application address space</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcsynopsisinfo> +#include <unistd.h> +#include <sys/mman.h></funcsynopsisinfo> + <funcprototype> + <funcdef>void *<function>mmap</function></funcdef> + <paramdef>void *<parameter>start</parameter></paramdef> + <paramdef>size_t <parameter>length</parameter></paramdef> + <paramdef>int <parameter>prot</parameter></paramdef> + <paramdef>int <parameter>flags</parameter></paramdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>off_t <parameter>offset</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + <variablelist> + <varlistentry> + <term><parameter>start</parameter></term> + <listitem> + <para>Map the buffer to this address in the +application's address space. When the <constant>MAP_FIXED</constant> +flag is specified, <parameter>start</parameter> must be a multiple of the +pagesize and mmap will fail when the specified address +cannot be used. Use of this option is discouraged; applications should +just specify a <constant>NULL</constant> pointer here.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>length</parameter></term> + <listitem> + <para>Length of the memory area to map. This must be the +same value as returned by the driver in the &v4l2-buffer; +<structfield>length</structfield> field for the +single-planar API, and the same value as returned by the driver +in the &v4l2-plane; <structfield>length</structfield> field for the +multi-planar API.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>prot</parameter></term> + <listitem> + <para>The <parameter>prot</parameter> argument describes the +desired memory protection. Regardless of the device type and the +direction of data exchange it should be set to +<constant>PROT_READ</constant> | <constant>PROT_WRITE</constant>, +permitting read and write access to image buffers. Drivers should +support at least this combination of flags. Note the Linux +<filename>video-buf</filename> kernel module, which is used by the +bttv, saa7134, saa7146, cx88 and vivi driver supports only +<constant>PROT_READ</constant> | <constant>PROT_WRITE</constant>. When +the driver does not support the desired protection the +<function>mmap()</function> function fails.</para> + <para>Note device memory accesses (⪚ the memory on a +graphics card with video capturing hardware) may incur a performance +penalty compared to main memory accesses, or reads may be +significantly slower than writes or vice versa. Other I/O methods may +be more efficient in this case.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>flags</parameter></term> + <listitem> + <para>The <parameter>flags</parameter> parameter +specifies the type of the mapped object, mapping options and whether +modifications made to the mapped copy of the page are private to the +process or are to be shared with other references.</para> + <para><constant>MAP_FIXED</constant> requests that the +driver selects no other address than the one specified. If the +specified address cannot be used, <function>mmap()</function> will fail. If +<constant>MAP_FIXED</constant> is specified, +<parameter>start</parameter> must be a multiple of the pagesize. Use +of this option is discouraged.</para> + <para>One of the <constant>MAP_SHARED</constant> or +<constant>MAP_PRIVATE</constant> flags must be set. +<constant>MAP_SHARED</constant> allows applications to share the +mapped memory with other (⪚ child-) processes. Note the Linux +<filename>video-buf</filename> module which is used by the bttv, +saa7134, saa7146, cx88 and vivi driver supports only +<constant>MAP_SHARED</constant>. <constant>MAP_PRIVATE</constant> +requests copy-on-write semantics. V4L2 applications should not set the +<constant>MAP_PRIVATE</constant>, <constant>MAP_DENYWRITE</constant>, +<constant>MAP_EXECUTABLE</constant> or <constant>MAP_ANON</constant> +flag.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>offset</parameter></term> + <listitem> + <para>Offset of the buffer in device memory. This must be the +same value as returned by the driver in the &v4l2-buffer; +<structfield>m</structfield> union <structfield>offset</structfield> field for +the single-planar API, and the same value as returned by the driver +in the &v4l2-plane; <structfield>m</structfield> union +<structfield>mem_offset</structfield> field for the multi-planar API.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>The <function>mmap()</function> function asks to map +<parameter>length</parameter> bytes starting at +<parameter>offset</parameter> in the memory of the device specified by +<parameter>fd</parameter> into the application address space, +preferably at address <parameter>start</parameter>. This latter +address is a hint only, and is usually specified as 0.</para> + + <para>Suitable length and offset parameters are queried with the +&VIDIOC-QUERYBUF; ioctl. Buffers must be allocated with the +&VIDIOC-REQBUFS; ioctl before they can be queried.</para> + + <para>To unmap buffers the &func-munmap; function is used.</para> + </refsect1> + + <refsect1> + <title>Return Value</title> + + <para>On success <function>mmap()</function> returns a pointer to +the mapped buffer. On error <constant>MAP_FAILED</constant> (-1) is +returned, and the <varname>errno</varname> variable is set +appropriately. Possible error codes are:</para> + + <variablelist> + <varlistentry> + <term><errorcode>EBADF</errorcode></term> + <listitem> + <para><parameter>fd</parameter> is not a valid file +descriptor.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EACCES</errorcode></term> + <listitem> + <para><parameter>fd</parameter> is +not open for reading and writing.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The <parameter>start</parameter> or +<parameter>length</parameter> or <parameter>offset</parameter> are not +suitable. (E. g. they are too large, or not aligned on a +<constant>PAGESIZE</constant> boundary.)</para> + <para>The <parameter>flags</parameter> or +<parameter>prot</parameter> value is not supported.</para> + <para>No buffers have been allocated with the +&VIDIOC-REQBUFS; ioctl.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>ENOMEM</errorcode></term> + <listitem> + <para>Not enough physical or virtual memory was available to +complete the request.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/func-munmap.xml b/Documentation/DocBook/media/v4l/func-munmap.xml new file mode 100644 index 00000000000..860d49ca54a --- /dev/null +++ b/Documentation/DocBook/media/v4l/func-munmap.xml @@ -0,0 +1,76 @@ +<refentry id="func-munmap"> + <refmeta> + <refentrytitle>V4L2 munmap()</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>v4l2-munmap</refname> + <refpurpose>Unmap device memory</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcsynopsisinfo> +#include <unistd.h> +#include <sys/mman.h></funcsynopsisinfo> + <funcprototype> + <funcdef>int <function>munmap</function></funcdef> + <paramdef>void *<parameter>start</parameter></paramdef> + <paramdef>size_t <parameter>length</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + <refsect1> + <title>Arguments</title> + <variablelist> + <varlistentry> + <term><parameter>start</parameter></term> + <listitem> + <para>Address of the mapped buffer as returned by the +&func-mmap; function.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>length</parameter></term> + <listitem> + <para>Length of the mapped buffer. This must be the same +value as given to <function>mmap()</function> and returned by the +driver in the &v4l2-buffer; <structfield>length</structfield> +field for the single-planar API and in the &v4l2-plane; +<structfield>length</structfield> field for the multi-planar API.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>Unmaps a previously with the &func-mmap; function mapped +buffer and frees it, if possible. <!-- ? This function (not freeing) +has no impact on I/O in progress, specifically it does not imply +&VIDIOC-STREAMOFF; to terminate I/O. Unmapped buffers can still be +enqueued, dequeued or queried, they are just not accessible by the +application.--></para> + </refsect1> + + <refsect1> + <title>Return Value</title> + + <para>On success <function>munmap()</function> returns 0, on +failure -1 and the <varname>errno</varname> variable is set +appropriately:</para> + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The <parameter>start</parameter> or +<parameter>length</parameter> is incorrect, or no buffers have been +mapped yet.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/func-open.xml b/Documentation/DocBook/media/v4l/func-open.xml new file mode 100644 index 00000000000..cf64e207c3e --- /dev/null +++ b/Documentation/DocBook/media/v4l/func-open.xml @@ -0,0 +1,113 @@ +<refentry id="func-open"> + <refmeta> + <refentrytitle>V4L2 open()</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>v4l2-open</refname> + <refpurpose>Open a V4L2 device</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcsynopsisinfo>#include <fcntl.h></funcsynopsisinfo> + <funcprototype> + <funcdef>int <function>open</function></funcdef> + <paramdef>const char *<parameter>device_name</parameter></paramdef> + <paramdef>int <parameter>flags</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>device_name</parameter></term> + <listitem> + <para>Device to be opened.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>flags</parameter></term> + <listitem> + <para>Open flags. Access mode must be +<constant>O_RDWR</constant>. This is just a technicality, input devices +still support only reading and output devices only writing.</para> + <para>When the <constant>O_NONBLOCK</constant> flag is +given, the read() function and the &VIDIOC-DQBUF; ioctl will return +the &EAGAIN; when no data is available or no buffer is in the driver +outgoing queue, otherwise these functions block until data becomes +available. All V4L2 drivers exchanging data with applications must +support the <constant>O_NONBLOCK</constant> flag.</para> + <para>Other flags have no effect.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + <refsect1> + <title>Description</title> + + <para>To open a V4L2 device applications call +<function>open()</function> with the desired device name. This +function has no side effects; all data format parameters, current +input or output, control values or other properties remain unchanged. +At the first <function>open()</function> call after loading the driver +they will be reset to default values, drivers are never in an +undefined state.</para> + </refsect1> + <refsect1> + <title>Return Value</title> + + <para>On success <function>open</function> returns the new file +descriptor. On error -1 is returned, and the <varname>errno</varname> +variable is set appropriately. Possible error codes are:</para> + + <variablelist> + <varlistentry> + <term><errorcode>EACCES</errorcode></term> + <listitem> + <para>The caller has no permission to access the +device.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EBUSY</errorcode></term> + <listitem> + <para>The driver does not support multiple opens and the +device is already in use.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>ENXIO</errorcode></term> + <listitem> + <para>No device corresponding to this device special file +exists.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>ENOMEM</errorcode></term> + <listitem> + <para>Not enough kernel memory was available to complete the +request.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EMFILE</errorcode></term> + <listitem> + <para>The process already has the maximum number of +files open.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>ENFILE</errorcode></term> + <listitem> + <para>The limit on the total number of files open on the +system has been reached.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/func-poll.xml b/Documentation/DocBook/media/v4l/func-poll.xml new file mode 100644 index 00000000000..85cad8bff5b --- /dev/null +++ b/Documentation/DocBook/media/v4l/func-poll.xml @@ -0,0 +1,119 @@ +<refentry id="func-poll"> + <refmeta> + <refentrytitle>V4L2 poll()</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>v4l2-poll</refname> + <refpurpose>Wait for some event on a file descriptor</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcsynopsisinfo>#include <sys/poll.h></funcsynopsisinfo> + <funcprototype> + <funcdef>int <function>poll</function></funcdef> + <paramdef>struct pollfd *<parameter>ufds</parameter></paramdef> + <paramdef>unsigned int <parameter>nfds</parameter></paramdef> + <paramdef>int <parameter>timeout</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Description</title> + + <para>With the <function>poll()</function> function applications +can suspend execution until the driver has captured data or is ready +to accept data for output.</para> + + <para>When streaming I/O has been negotiated this function waits +until a buffer has been filled or displayed and can be dequeued with +the &VIDIOC-DQBUF; ioctl. When buffers are already in the outgoing +queue of the driver the function returns immediately.</para> + + <para>On success <function>poll()</function> returns the number of +file descriptors that have been selected (that is, file descriptors +for which the <structfield>revents</structfield> field of the +respective <structname>pollfd</structname> structure is non-zero). +Capture devices set the <constant>POLLIN</constant> and +<constant>POLLRDNORM</constant> flags in the +<structfield>revents</structfield> field, output devices the +<constant>POLLOUT</constant> and <constant>POLLWRNORM</constant> +flags. When the function timed out it returns a value of zero, on +failure it returns <returnvalue>-1</returnvalue> and the +<varname>errno</varname> variable is set appropriately. When the +application did not call &VIDIOC-QBUF; or &VIDIOC-STREAMON; yet the +<function>poll()</function> function succeeds, but sets the +<constant>POLLERR</constant> flag in the +<structfield>revents</structfield> field.</para> + + <para>When use of the <function>read()</function> function has +been negotiated and the driver does not capture yet, the +<function>poll</function> function starts capturing. When that fails +it returns a <constant>POLLERR</constant> as above. Otherwise it waits +until data has been captured and can be read. When the driver captures +continuously (as opposed to, for example, still images) the function +may return immediately.</para> + + <para>When use of the <function>write()</function> function has +been negotiated the <function>poll</function> function just waits +until the driver is ready for a non-blocking +<function>write()</function> call.</para> + + <para>All drivers implementing the <function>read()</function> or +<function>write()</function> function or streaming I/O must also +support the <function>poll()</function> function.</para> + + <para>For more details see the +<function>poll()</function> manual page.</para> + </refsect1> + + <refsect1> + <title>Return Value</title> + + <para>On success, <function>poll()</function> returns the number +structures which have non-zero <structfield>revents</structfield> +fields, or zero if the call timed out. On error +<returnvalue>-1</returnvalue> is returned, and the +<varname>errno</varname> variable is set appropriately:</para> + + <variablelist> + <varlistentry> + <term><errorcode>EBADF</errorcode></term> + <listitem> + <para>One or more of the <parameter>ufds</parameter> members +specify an invalid file descriptor.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EBUSY</errorcode></term> + <listitem> + <para>The driver does not support multiple read or write +streams and the device is already in use.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EFAULT</errorcode></term> + <listitem> + <para><parameter>ufds</parameter> references an inaccessible +memory area.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EINTR</errorcode></term> + <listitem> + <para>The call was interrupted by a signal.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The <parameter>nfds</parameter> argument is greater +than <constant>OPEN_MAX</constant>.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/func-read.xml b/Documentation/DocBook/media/v4l/func-read.xml new file mode 100644 index 00000000000..e218bbfbd36 --- /dev/null +++ b/Documentation/DocBook/media/v4l/func-read.xml @@ -0,0 +1,181 @@ +<refentry id="func-read"> + <refmeta> + <refentrytitle>V4L2 read()</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>v4l2-read</refname> + <refpurpose>Read from a V4L2 device</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcsynopsisinfo>#include <unistd.h></funcsynopsisinfo> + <funcprototype> + <funcdef>ssize_t <function>read</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>void *<parameter>buf</parameter></paramdef> + <paramdef>size_t <parameter>count</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>buf</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>count</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para><function>read()</function> attempts to read up to +<parameter>count</parameter> bytes from file descriptor +<parameter>fd</parameter> into the buffer starting at +<parameter>buf</parameter>. The layout of the data in the buffer is +discussed in the respective device interface section, see ##. If <parameter>count</parameter> is zero, +<function>read()</function> returns zero and has no other results. If +<parameter>count</parameter> is greater than +<constant>SSIZE_MAX</constant>, the result is unspecified. Regardless +of the <parameter>count</parameter> value each +<function>read()</function> call will provide at most one frame (two +fields) worth of data.</para> + + <para>By default <function>read()</function> blocks until data +becomes available. When the <constant>O_NONBLOCK</constant> flag was +given to the &func-open; function it +returns immediately with an &EAGAIN; when no data is available. The +&func-select; or &func-poll; functions +can always be used to suspend execution until data becomes available. All +drivers supporting the <function>read()</function> function must also +support <function>select()</function> and +<function>poll()</function>.</para> + + <para>Drivers can implement read functionality in different +ways, using a single or multiple buffers and discarding the oldest or +newest frames once the internal buffers are filled.</para> + + <para><function>read()</function> never returns a "snapshot" of a +buffer being filled. Using a single buffer the driver will stop +capturing when the application starts reading the buffer until the +read is finished. Thus only the period of the vertical blanking +interval is available for reading, or the capture rate must fall below +the nominal frame rate of the video standard.</para> + +<para>The behavior of +<function>read()</function> when called during the active picture +period or the vertical blanking separating the top and bottom field +depends on the discarding policy. A driver discarding the oldest +frames keeps capturing into an internal buffer, continuously +overwriting the previously, not read frame, and returns the frame +being received at the time of the <function>read()</function> call as +soon as it is complete.</para> + + <para>A driver discarding the newest frames stops capturing until +the next <function>read()</function> call. The frame being received at +<function>read()</function> time is discarded, returning the following +frame instead. Again this implies a reduction of the capture rate to +one half or less of the nominal frame rate. An example of this model +is the video read mode of the bttv driver, initiating a DMA to user +memory when <function>read()</function> is called and returning when +the DMA finished.</para> + + <para>In the multiple buffer model drivers maintain a ring of +internal buffers, automatically advancing to the next free buffer. +This allows continuous capturing when the application can empty the +buffers fast enough. Again, the behavior when the driver runs out of +free buffers depends on the discarding policy.</para> + + <para>Applications can get and set the number of buffers used +internally by the driver with the &VIDIOC-G-PARM; and &VIDIOC-S-PARM; +ioctls. They are optional, however. The discarding policy is not +reported and cannot be changed. For minimum requirements see <xref + linkend="devices" />.</para> + </refsect1> + + <refsect1> + <title>Return Value</title> + + <para>On success, the number of bytes read is returned. It is not +an error if this number is smaller than the number of bytes requested, +or the amount of data required for one frame. This may happen for +example because <function>read()</function> was interrupted by a +signal. On error, -1 is returned, and the <varname>errno</varname> +variable is set appropriately. In this case the next read will start +at the beginning of a new frame. Possible error codes are:</para> + + <variablelist> + <varlistentry> + <term><errorcode>EAGAIN</errorcode></term> + <listitem> + <para>Non-blocking I/O has been selected using +O_NONBLOCK and no data was immediately available for reading.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EBADF</errorcode></term> + <listitem> + <para><parameter>fd</parameter> is not a valid file +descriptor or is not open for reading, or the process already has the +maximum number of files open.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EBUSY</errorcode></term> + <listitem> + <para>The driver does not support multiple read streams and the +device is already in use.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EFAULT</errorcode></term> + <listitem> + <para><parameter>buf</parameter> references an inaccessible +memory area.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EINTR</errorcode></term> + <listitem> + <para>The call was interrupted by a signal before any +data was read.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EIO</errorcode></term> + <listitem> + <para>I/O error. This indicates some hardware problem or a +failure to communicate with a remote device (USB camera etc.).</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The <function>read()</function> function is not +supported by this driver, not on this device, or generally not on this +type of device.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/func-select.xml b/Documentation/DocBook/media/v4l/func-select.xml new file mode 100644 index 00000000000..e12a60d9bd8 --- /dev/null +++ b/Documentation/DocBook/media/v4l/func-select.xml @@ -0,0 +1,130 @@ +<refentry id="func-select"> + <refmeta> + <refentrytitle>V4L2 select()</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>v4l2-select</refname> + <refpurpose>Synchronous I/O multiplexing</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcsynopsisinfo> +#include <sys/time.h> +#include <sys/types.h> +#include <unistd.h></funcsynopsisinfo> + <funcprototype> + <funcdef>int <function>select</function></funcdef> + <paramdef>int <parameter>nfds</parameter></paramdef> + <paramdef>fd_set *<parameter>readfds</parameter></paramdef> + <paramdef>fd_set *<parameter>writefds</parameter></paramdef> + <paramdef>fd_set *<parameter>exceptfds</parameter></paramdef> + <paramdef>struct timeval *<parameter>timeout</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Description</title> + + <para>With the <function>select()</function> function applications +can suspend execution until the driver has captured data or is ready +to accept data for output.</para> + + <para>When streaming I/O has been negotiated this function waits +until a buffer has been filled or displayed and can be dequeued with +the &VIDIOC-DQBUF; ioctl. When buffers are already in the outgoing +queue of the driver the function returns immediately.</para> + + <para>On success <function>select()</function> returns the total +number of bits set in the <structname>fd_set</structname>s. When the +function timed out it returns a value of zero. On failure it returns +<returnvalue>-1</returnvalue> and the <varname>errno</varname> +variable is set appropriately. When the application did not call +&VIDIOC-QBUF; or &VIDIOC-STREAMON; yet the +<function>select()</function> function succeeds, setting the bit of +the file descriptor in <parameter>readfds</parameter> or +<parameter>writefds</parameter>, but subsequent &VIDIOC-DQBUF; calls +will fail.<footnote><para>The Linux kernel implements +<function>select()</function> like the &func-poll; function, but +<function>select()</function> cannot return a +<constant>POLLERR</constant>.</para> + </footnote></para> + + <para>When use of the <function>read()</function> function has +been negotiated and the driver does not capture yet, the +<function>select()</function> function starts capturing. When that +fails, <function>select()</function> returns successful and a +subsequent <function>read()</function> call, which also attempts to +start capturing, will return an appropriate error code. When the +driver captures continuously (as opposed to, for example, still +images) and data is already available the +<function>select()</function> function returns immediately.</para> + + <para>When use of the <function>write()</function> function has +been negotiated the <function>select()</function> function just waits +until the driver is ready for a non-blocking +<function>write()</function> call.</para> + + <para>All drivers implementing the <function>read()</function> or +<function>write()</function> function or streaming I/O must also +support the <function>select()</function> function.</para> + + <para>For more details see the <function>select()</function> +manual page.</para> + + </refsect1> + + <refsect1> + <title>Return Value</title> + + <para>On success, <function>select()</function> returns the number +of descriptors contained in the three returned descriptor sets, which +will be zero if the timeout expired. On error +<returnvalue>-1</returnvalue> is returned, and the +<varname>errno</varname> variable is set appropriately; the sets and +<parameter>timeout</parameter> are undefined. Possible error codes +are:</para> + + <variablelist> + <varlistentry> + <term><errorcode>EBADF</errorcode></term> + <listitem> + <para>One or more of the file descriptor sets specified a +file descriptor that is not open.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EBUSY</errorcode></term> + <listitem> + <para>The driver does not support multiple read or write +streams and the device is already in use.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EFAULT</errorcode></term> + <listitem> + <para>The <parameter>readfds</parameter>, +<parameter>writefds</parameter>, <parameter>exceptfds</parameter> or +<parameter>timeout</parameter> pointer references an inaccessible memory +area.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EINTR</errorcode></term> + <listitem> + <para>The call was interrupted by a signal.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The <parameter>nfds</parameter> argument is less than +zero or greater than <constant>FD_SETSIZE</constant>.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/func-write.xml b/Documentation/DocBook/media/v4l/func-write.xml new file mode 100644 index 00000000000..57520788572 --- /dev/null +++ b/Documentation/DocBook/media/v4l/func-write.xml @@ -0,0 +1,128 @@ +<refentry id="func-write"> + <refmeta> + <refentrytitle>V4L2 write()</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>v4l2-write</refname> + <refpurpose>Write to a V4L2 device</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcsynopsisinfo>#include <unistd.h></funcsynopsisinfo> + <funcprototype> + <funcdef>ssize_t <function>write</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>void *<parameter>buf</parameter></paramdef> + <paramdef>size_t <parameter>count</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>buf</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>count</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para><function>write()</function> writes up to +<parameter>count</parameter> bytes to the device referenced by the +file descriptor <parameter>fd</parameter> from the buffer starting at +<parameter>buf</parameter>. When the hardware outputs are not active +yet, this function enables them. When <parameter>count</parameter> is +zero, <function>write()</function> returns +<returnvalue>0</returnvalue> without any other effect.</para> + + <para>When the application does not provide more data in time, the +previous video frame, raw VBI image, sliced VPS or WSS data is +displayed again. Sliced Teletext or Closed Caption data is not +repeated, the driver inserts a blank line instead.</para> + </refsect1> + + <refsect1> + <title>Return Value</title> + + <para>On success, the number of bytes written are returned. Zero +indicates nothing was written. On error, <returnvalue>-1</returnvalue> +is returned, and the <varname>errno</varname> variable is set +appropriately. In this case the next write will start at the beginning +of a new frame. Possible error codes are:</para> + + <variablelist> + <varlistentry> + <term><errorcode>EAGAIN</errorcode></term> + <listitem> + <para>Non-blocking I/O has been selected using the <link +linkend="func-open"><constant>O_NONBLOCK</constant></link> flag and no +buffer space was available to write the data immediately.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EBADF</errorcode></term> + <listitem> + <para><parameter>fd</parameter> is not a valid file +descriptor or is not open for writing.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EBUSY</errorcode></term> + <listitem> + <para>The driver does not support multiple write streams and the +device is already in use.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EFAULT</errorcode></term> + <listitem> + <para><parameter>buf</parameter> references an inaccessible +memory area.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EINTR</errorcode></term> + <listitem> + <para>The call was interrupted by a signal before any +data was written.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EIO</errorcode></term> + <listitem> + <para>I/O error. This indicates some hardware problem.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The <function>write()</function> function is not +supported by this driver, not on this device, or generally not on this +type of device.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/gen-errors.xml b/Documentation/DocBook/media/v4l/gen-errors.xml new file mode 100644 index 00000000000..7e29a4e1f69 --- /dev/null +++ b/Documentation/DocBook/media/v4l/gen-errors.xml @@ -0,0 +1,77 @@ +<title>Generic Error Codes</title> + +<table frame="none" pgwide="1" id="gen-errors"> + <title>Generic error codes</title> + <tgroup cols="2"> + &cs-str; + <tbody valign="top"> + <!-- Keep it ordered alphabetically --> + <row> + <entry>EAGAIN (aka EWOULDBLOCK)</entry> + <entry>The ioctl can't be handled because the device is in state where + it can't perform it. This could happen for example in case where + device is sleeping and ioctl is performed to query statistics. + It is also returned when the ioctl would need to wait + for an event, but the device was opened in non-blocking mode. + </entry> + </row> + <row> + <entry>EBADF</entry> + <entry>The file descriptor is not a valid.</entry> + </row> + <row> + <entry>EBUSY</entry> + <entry>The ioctl can't be handled because the device is busy. This is + typically return while device is streaming, and an ioctl tried to + change something that would affect the stream, or would require the + usage of a hardware resource that was already allocated. The ioctl + must not be retried without performing another action to fix the + problem first (typically: stop the stream before retrying).</entry> + </row> + <row> + <entry>EFAULT</entry> + <entry>There was a failure while copying data from/to userspace, + probably caused by an invalid pointer reference.</entry> + </row> + <row> + <entry>EINVAL</entry> + <entry>One or more of the ioctl parameters are invalid or out of the + allowed range. This is a widely used error code. See the individual + ioctl requests for specific causes.</entry> + </row> + <row> + <entry>ENODEV</entry> + <entry>Device not found or was removed.</entry> + </row> + <row> + <entry>ENOMEM</entry> + <entry>There's not enough memory to handle the desired operation.</entry> + </row> + <row> + <entry>ENOTTY</entry> + <entry>The ioctl is not supported by the driver, actually meaning that + the required functionality is not available, or the file + descriptor is not for a media device.</entry> + </row> + <row> + <entry>ENOSPC</entry> + <entry>On USB devices, the stream ioctl's can return this error, meaning + that this request would overcommit the usb bandwidth reserved + for periodic transfers (up to 80% of the USB bandwidth).</entry> + </row> + <row> + <entry>EPERM</entry> + <entry>Permission denied. Can be returned if the device needs write + permission, or some special capabilities is needed + (e. g. root)</entry> + </row> + </tbody> + </tgroup> +</table> + +<para>Note 1: ioctls may return other error codes. Since errors may have side +effects such as a driver reset, applications should abort on unexpected errors. +</para> + +<para>Note 2: Request-specific error codes are listed in the individual +requests descriptions.</para> diff --git a/Documentation/DocBook/media/v4l/io.xml b/Documentation/DocBook/media/v4l/io.xml new file mode 100644 index 00000000000..a086a5db7a1 --- /dev/null +++ b/Documentation/DocBook/media/v4l/io.xml @@ -0,0 +1,1525 @@ + <title>Input/Output</title> + + <para>The V4L2 API defines several different methods to read from or +write to a device. All drivers exchanging data with applications must +support at least one of them.</para> + + <para>The classic I/O method using the <function>read()</function> +and <function>write()</function> function is automatically selected +after opening a V4L2 device. When the driver does not support this +method attempts to read or write will fail at any time.</para> + + <para>Other methods must be negotiated. To select the streaming I/O +method with memory mapped or user buffers applications call the +&VIDIOC-REQBUFS; ioctl. The asynchronous I/O method is not defined +yet.</para> + + <para>Video overlay can be considered another I/O method, although +the application does not directly receive the image data. It is +selected by initiating video overlay with the &VIDIOC-S-FMT; ioctl. +For more information see <xref linkend="overlay" />.</para> + + <para>Generally exactly one I/O method, including overlay, is +associated with each file descriptor. The only exceptions are +applications not exchanging data with a driver ("panel applications", +see <xref linkend="open" />) and drivers permitting simultaneous video capturing +and overlay using the same file descriptor, for compatibility with V4L +and earlier versions of V4L2.</para> + + <para><constant>VIDIOC_S_FMT</constant> and +<constant>VIDIOC_REQBUFS</constant> would permit this to some degree, +but for simplicity drivers need not support switching the I/O method +(after first switching away from read/write) other than by closing +and reopening the device.</para> + + <para>The following sections describe the various I/O methods in +more detail.</para> + + <section id="rw"> + <title>Read/Write</title> + + <para>Input and output devices support the +<function>read()</function> and <function>write()</function> function, +respectively, when the <constant>V4L2_CAP_READWRITE</constant> flag in +the <structfield>capabilities</structfield> field of &v4l2-capability; +returned by the &VIDIOC-QUERYCAP; ioctl is set.</para> + + <para>Drivers may need the CPU to copy the data, but they may also +support DMA to or from user memory, so this I/O method is not +necessarily less efficient than other methods merely exchanging buffer +pointers. It is considered inferior though because no meta-information +like frame counters or timestamps are passed. This information is +necessary to recognize frame dropping and to synchronize with other +data streams. However this is also the simplest I/O method, requiring +little or no setup to exchange data. It permits command line stunts +like this (the <application>vidctrl</application> tool is +fictitious):</para> + + <informalexample> + <screen> +> vidctrl /dev/video --input=0 --format=YUYV --size=352x288 +> dd if=/dev/video of=myimage.422 bs=202752 count=1 +</screen> + </informalexample> + + <para>To read from the device applications use the +&func-read; function, to write the &func-write; function. +Drivers must implement one I/O method if they +exchange data with applications, but it need not be this.<footnote> + <para>It would be desirable if applications could depend on +drivers supporting all I/O interfaces, but as much as the complex +memory mapping I/O can be inadequate for some devices we have no +reason to require this interface, which is most useful for simple +applications capturing still images.</para> + </footnote> When reading or writing is supported, the driver +must also support the &func-select; and &func-poll; +function.<footnote> + <para>At the driver level <function>select()</function> and +<function>poll()</function> are the same, and +<function>select()</function> is too important to be optional.</para> + </footnote></para> + </section> + + <section id="mmap"> + <title>Streaming I/O (Memory Mapping)</title> + + <para>Input and output devices support this I/O method when the +<constant>V4L2_CAP_STREAMING</constant> flag in the +<structfield>capabilities</structfield> field of &v4l2-capability; +returned by the &VIDIOC-QUERYCAP; ioctl is set. There are two +streaming methods, to determine if the memory mapping flavor is +supported applications must call the &VIDIOC-REQBUFS; ioctl.</para> + + <para>Streaming is an I/O method where only pointers to buffers +are exchanged between application and driver, the data itself is not +copied. Memory mapping is primarily intended to map buffers in device +memory into the application's address space. Device memory can be for +example the video memory on a graphics card with a video capture +add-on. However, being the most efficient I/O method available for a +long time, many other drivers support streaming as well, allocating +buffers in DMA-able main memory.</para> + + <para>A driver can support many sets of buffers. Each set is +identified by a unique buffer type value. The sets are independent and +each set can hold a different type of data. To access different sets +at the same time different file descriptors must be used.<footnote> + <para>One could use one file descriptor and set the buffer +type field accordingly when calling &VIDIOC-QBUF; etc., but it makes +the <function>select()</function> function ambiguous. We also like the +clean approach of one file descriptor per logical stream. Video +overlay for example is also a logical stream, although the CPU is not +needed for continuous operation.</para> + </footnote></para> + + <para>To allocate device buffers applications call the +&VIDIOC-REQBUFS; ioctl with the desired number of buffers and buffer +type, for example <constant>V4L2_BUF_TYPE_VIDEO_CAPTURE</constant>. +This ioctl can also be used to change the number of buffers or to free +the allocated memory, provided none of the buffers are still +mapped.</para> + + <para>Before applications can access the buffers they must map +them into their address space with the &func-mmap; function. The +location of the buffers in device memory can be determined with the +&VIDIOC-QUERYBUF; ioctl. In the single-planar API case, the +<structfield>m.offset</structfield> and <structfield>length</structfield> +returned in a &v4l2-buffer; are passed as sixth and second parameter to the +<function>mmap()</function> function. When using the multi-planar API, +&v4l2-buffer; contains an array of &v4l2-plane; structures, each +containing its own <structfield>m.offset</structfield> and +<structfield>length</structfield>. When using the multi-planar API, every +plane of every buffer has to be mapped separately, so the number of +calls to &func-mmap; should be equal to number of buffers times number of +planes in each buffer. The offset and length values must not be modified. +Remember, the buffers are allocated in physical memory, as opposed to virtual +memory, which can be swapped out to disk. Applications should free the buffers +as soon as possible with the &func-munmap; function.</para> + + <example> + <title>Mapping buffers in the single-planar API</title> + <programlisting> +&v4l2-requestbuffers; reqbuf; +struct { + void *start; + size_t length; +} *buffers; +unsigned int i; + +memset(&reqbuf, 0, sizeof(reqbuf)); +reqbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; +reqbuf.memory = V4L2_MEMORY_MMAP; +reqbuf.count = 20; + +if (-1 == ioctl (fd, &VIDIOC-REQBUFS;, &reqbuf)) { + if (errno == EINVAL) + printf("Video capturing or mmap-streaming is not supported\n"); + else + perror("VIDIOC_REQBUFS"); + + exit(EXIT_FAILURE); +} + +/* We want at least five buffers. */ + +if (reqbuf.count < 5) { + /* You may need to free the buffers here. */ + printf("Not enough buffer memory\n"); + exit(EXIT_FAILURE); +} + +buffers = calloc(reqbuf.count, sizeof(*buffers)); +assert(buffers != NULL); + +for (i = 0; i < reqbuf.count; i++) { + &v4l2-buffer; buffer; + + memset(&buffer, 0, sizeof(buffer)); + buffer.type = reqbuf.type; + buffer.memory = V4L2_MEMORY_MMAP; + buffer.index = i; + + if (-1 == ioctl (fd, &VIDIOC-QUERYBUF;, &buffer)) { + perror("VIDIOC_QUERYBUF"); + exit(EXIT_FAILURE); + } + + buffers[i].length = buffer.length; /* remember for munmap() */ + + buffers[i].start = mmap(NULL, buffer.length, + PROT_READ | PROT_WRITE, /* recommended */ + MAP_SHARED, /* recommended */ + fd, buffer.m.offset); + + if (MAP_FAILED == buffers[i].start) { + /* If you do not exit here you should unmap() and free() + the buffers mapped so far. */ + perror("mmap"); + exit(EXIT_FAILURE); + } +} + +/* Cleanup. */ + +for (i = 0; i < reqbuf.count; i++) + munmap(buffers[i].start, buffers[i].length); + </programlisting> + </example> + + <example> + <title>Mapping buffers in the multi-planar API</title> + <programlisting> +&v4l2-requestbuffers; reqbuf; +/* Our current format uses 3 planes per buffer */ +#define FMT_NUM_PLANES = 3 + +struct { + void *start[FMT_NUM_PLANES]; + size_t length[FMT_NUM_PLANES]; +} *buffers; +unsigned int i, j; + +memset(&reqbuf, 0, sizeof(reqbuf)); +reqbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE; +reqbuf.memory = V4L2_MEMORY_MMAP; +reqbuf.count = 20; + +if (ioctl(fd, &VIDIOC-REQBUFS;, &reqbuf) < 0) { + if (errno == EINVAL) + printf("Video capturing or mmap-streaming is not supported\n"); + else + perror("VIDIOC_REQBUFS"); + + exit(EXIT_FAILURE); +} + +/* We want at least five buffers. */ + +if (reqbuf.count < 5) { + /* You may need to free the buffers here. */ + printf("Not enough buffer memory\n"); + exit(EXIT_FAILURE); +} + +buffers = calloc(reqbuf.count, sizeof(*buffers)); +assert(buffers != NULL); + +for (i = 0; i < reqbuf.count; i++) { + &v4l2-buffer; buffer; + &v4l2-plane; planes[FMT_NUM_PLANES]; + + memset(&buffer, 0, sizeof(buffer)); + buffer.type = reqbuf.type; + buffer.memory = V4L2_MEMORY_MMAP; + buffer.index = i; + /* length in struct v4l2_buffer in multi-planar API stores the size + * of planes array. */ + buffer.length = FMT_NUM_PLANES; + buffer.m.planes = planes; + + if (ioctl(fd, &VIDIOC-QUERYBUF;, &buffer) < 0) { + perror("VIDIOC_QUERYBUF"); + exit(EXIT_FAILURE); + } + + /* Every plane has to be mapped separately */ + for (j = 0; j < FMT_NUM_PLANES; j++) { + buffers[i].length[j] = buffer.m.planes[j].length; /* remember for munmap() */ + + buffers[i].start[j] = mmap(NULL, buffer.m.planes[j].length, + PROT_READ | PROT_WRITE, /* recommended */ + MAP_SHARED, /* recommended */ + fd, buffer.m.planes[j].m.offset); + + if (MAP_FAILED == buffers[i].start[j]) { + /* If you do not exit here you should unmap() and free() + the buffers and planes mapped so far. */ + perror("mmap"); + exit(EXIT_FAILURE); + } + } +} + +/* Cleanup. */ + +for (i = 0; i < reqbuf.count; i++) + for (j = 0; j < FMT_NUM_PLANES; j++) + munmap(buffers[i].start[j], buffers[i].length[j]); + </programlisting> + </example> + + <para>Conceptually streaming drivers maintain two buffer queues, an incoming +and an outgoing queue. They separate the synchronous capture or output +operation locked to a video clock from the application which is +subject to random disk or network delays and preemption by +other processes, thereby reducing the probability of data loss. +The queues are organized as FIFOs, buffers will be +output in the order enqueued in the incoming FIFO, and were +captured in the order dequeued from the outgoing FIFO.</para> + + <para>The driver may require a minimum number of buffers enqueued +at all times to function, apart of this no limit exists on the number +of buffers applications can enqueue in advance, or dequeue and +process. They can also enqueue in a different order than buffers have +been dequeued, and the driver can <emphasis>fill</emphasis> enqueued +<emphasis>empty</emphasis> buffers in any order. <footnote> + <para>Random enqueue order permits applications processing +images out of order (such as video codecs) to return buffers earlier, +reducing the probability of data loss. Random fill order allows +drivers to reuse buffers on a LIFO-basis, taking advantage of caches +holding scatter-gather lists and the like.</para> + </footnote> The index number of a buffer (&v4l2-buffer; +<structfield>index</structfield>) plays no role here, it only +identifies the buffer.</para> + + <para>Initially all mapped buffers are in dequeued state, +inaccessible by the driver. For capturing applications it is customary +to first enqueue all mapped buffers, then to start capturing and enter +the read loop. Here the application waits until a filled buffer can be +dequeued, and re-enqueues the buffer when the data is no longer +needed. Output applications fill and enqueue buffers, when enough +buffers are stacked up the output is started with +<constant>VIDIOC_STREAMON</constant>. In the write loop, when +the application runs out of free buffers, it must wait until an empty +buffer can be dequeued and reused.</para> + + <para>To enqueue and dequeue a buffer applications use the +&VIDIOC-QBUF; and &VIDIOC-DQBUF; ioctl. The status of a buffer being +mapped, enqueued, full or empty can be determined at any time using the +&VIDIOC-QUERYBUF; ioctl. Two methods exist to suspend execution of the +application until one or more buffers can be dequeued. By default +<constant>VIDIOC_DQBUF</constant> blocks when no buffer is in the +outgoing queue. When the <constant>O_NONBLOCK</constant> flag was +given to the &func-open; function, <constant>VIDIOC_DQBUF</constant> +returns immediately with an &EAGAIN; when no buffer is available. The +&func-select; or &func-poll; functions are always available.</para> + + <para>To start and stop capturing or output applications call the +&VIDIOC-STREAMON; and &VIDIOC-STREAMOFF; ioctl. Note +<constant>VIDIOC_STREAMOFF</constant> removes all buffers from both +queues as a side effect. Since there is no notion of doing anything +"now" on a multitasking system, if an application needs to synchronize +with another event it should examine the &v4l2-buffer; +<structfield>timestamp</structfield> of captured or outputted buffers. +</para> + + <para>Drivers implementing memory mapping I/O must +support the <constant>VIDIOC_REQBUFS</constant>, +<constant>VIDIOC_QUERYBUF</constant>, +<constant>VIDIOC_QBUF</constant>, <constant>VIDIOC_DQBUF</constant>, +<constant>VIDIOC_STREAMON</constant> and +<constant>VIDIOC_STREAMOFF</constant> ioctl, the +<function>mmap()</function>, <function>munmap()</function>, +<function>select()</function> and <function>poll()</function> +function.<footnote> + <para>At the driver level <function>select()</function> and +<function>poll()</function> are the same, and +<function>select()</function> is too important to be optional. The +rest should be evident.</para> + </footnote></para> + + <para>[capture example]</para> + + </section> + + <section id="userp"> + <title>Streaming I/O (User Pointers)</title> + + <para>Input and output devices support this I/O method when the +<constant>V4L2_CAP_STREAMING</constant> flag in the +<structfield>capabilities</structfield> field of &v4l2-capability; +returned by the &VIDIOC-QUERYCAP; ioctl is set. If the particular user +pointer method (not only memory mapping) is supported must be +determined by calling the &VIDIOC-REQBUFS; ioctl.</para> + + <para>This I/O method combines advantages of the read/write and +memory mapping methods. Buffers (planes) are allocated by the application +itself, and can reside for example in virtual or shared memory. Only +pointers to data are exchanged, these pointers and meta-information +are passed in &v4l2-buffer; (or in &v4l2-plane; in the multi-planar API case). +The driver must be switched into user pointer I/O mode by calling the +&VIDIOC-REQBUFS; with the desired buffer type. No buffers (planes) are allocated +beforehand, consequently they are not indexed and cannot be queried like mapped +buffers with the <constant>VIDIOC_QUERYBUF</constant> ioctl.</para> + + <example> + <title>Initiating streaming I/O with user pointers</title> + + <programlisting> +&v4l2-requestbuffers; reqbuf; + +memset (&reqbuf, 0, sizeof (reqbuf)); +reqbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; +reqbuf.memory = V4L2_MEMORY_USERPTR; + +if (ioctl (fd, &VIDIOC-REQBUFS;, &reqbuf) == -1) { + if (errno == EINVAL) + printf ("Video capturing or user pointer streaming is not supported\n"); + else + perror ("VIDIOC_REQBUFS"); + + exit (EXIT_FAILURE); +} + </programlisting> + </example> + + <para>Buffer (plane) addresses and sizes are passed on the fly with the +&VIDIOC-QBUF; ioctl. Although buffers are commonly cycled, +applications can pass different addresses and sizes at each +<constant>VIDIOC_QBUF</constant> call. If required by the hardware the +driver swaps memory pages within physical memory to create a +continuous area of memory. This happens transparently to the +application in the virtual memory subsystem of the kernel. When buffer +pages have been swapped out to disk they are brought back and finally +locked in physical memory for DMA.<footnote> + <para>We expect that frequently used buffers are typically not +swapped out. Anyway, the process of swapping, locking or generating +scatter-gather lists may be time consuming. The delay can be masked by +the depth of the incoming buffer queue, and perhaps by maintaining +caches assuming a buffer will be soon enqueued again. On the other +hand, to optimize memory usage drivers can limit the number of buffers +locked in advance and recycle the most recently used buffers first. Of +course, the pages of empty buffers in the incoming queue need not be +saved to disk. Output buffers must be saved on the incoming and +outgoing queue because an application may share them with other +processes.</para> + </footnote></para> + + <para>Filled or displayed buffers are dequeued with the +&VIDIOC-DQBUF; ioctl. The driver can unlock the memory pages at any +time between the completion of the DMA and this ioctl. The memory is +also unlocked when &VIDIOC-STREAMOFF; is called, &VIDIOC-REQBUFS;, or +when the device is closed. Applications must take care not to free +buffers without dequeuing. For once, the buffers remain locked until +further, wasting physical memory. Second the driver will not be +notified when the memory is returned to the application's free list +and subsequently reused for other purposes, possibly completing the +requested DMA and overwriting valuable data.</para> + + <para>For capturing applications it is customary to enqueue a +number of empty buffers, to start capturing and enter the read loop. +Here the application waits until a filled buffer can be dequeued, and +re-enqueues the buffer when the data is no longer needed. Output +applications fill and enqueue buffers, when enough buffers are stacked +up output is started. In the write loop, when the application +runs out of free buffers it must wait until an empty buffer can be +dequeued and reused. Two methods exist to suspend execution of the +application until one or more buffers can be dequeued. By default +<constant>VIDIOC_DQBUF</constant> blocks when no buffer is in the +outgoing queue. When the <constant>O_NONBLOCK</constant> flag was +given to the &func-open; function, <constant>VIDIOC_DQBUF</constant> +returns immediately with an &EAGAIN; when no buffer is available. The +&func-select; or &func-poll; function are always available.</para> + + <para>To start and stop capturing or output applications call the +&VIDIOC-STREAMON; and &VIDIOC-STREAMOFF; ioctl. Note +<constant>VIDIOC_STREAMOFF</constant> removes all buffers from both +queues and unlocks all buffers as a side effect. Since there is no +notion of doing anything "now" on a multitasking system, if an +application needs to synchronize with another event it should examine +the &v4l2-buffer; <structfield>timestamp</structfield> of captured +or outputted buffers.</para> + + <para>Drivers implementing user pointer I/O must +support the <constant>VIDIOC_REQBUFS</constant>, +<constant>VIDIOC_QBUF</constant>, <constant>VIDIOC_DQBUF</constant>, +<constant>VIDIOC_STREAMON</constant> and +<constant>VIDIOC_STREAMOFF</constant> ioctl, the +<function>select()</function> and <function>poll()</function> function.<footnote> + <para>At the driver level <function>select()</function> and +<function>poll()</function> are the same, and +<function>select()</function> is too important to be optional. The +rest should be evident.</para> + </footnote></para> + </section> + + <section id="dmabuf"> + <title>Streaming I/O (DMA buffer importing)</title> + + <note> + <title>Experimental</title> + <para>This is an <link linkend="experimental">experimental</link> + interface and may change in the future.</para> + </note> + +<para>The DMABUF framework provides a generic method for sharing buffers +between multiple devices. Device drivers that support DMABUF can export a DMA +buffer to userspace as a file descriptor (known as the exporter role), import a +DMA buffer from userspace using a file descriptor previously exported for a +different or the same device (known as the importer role), or both. This +section describes the DMABUF importer role API in V4L2.</para> + + <para>Refer to <link linkend="vidioc-expbuf">DMABUF exporting</link> for +details about exporting V4L2 buffers as DMABUF file descriptors.</para> + +<para>Input and output devices support the streaming I/O method when the +<constant>V4L2_CAP_STREAMING</constant> flag in the +<structfield>capabilities</structfield> field of &v4l2-capability; returned by +the &VIDIOC-QUERYCAP; ioctl is set. Whether importing DMA buffers through +DMABUF file descriptors is supported is determined by calling the +&VIDIOC-REQBUFS; ioctl with the memory type set to +<constant>V4L2_MEMORY_DMABUF</constant>.</para> + + <para>This I/O method is dedicated to sharing DMA buffers between different +devices, which may be V4L devices or other video-related devices (e.g. DRM). +Buffers (planes) are allocated by a driver on behalf of an application. Next, +these buffers are exported to the application as file descriptors using an API +which is specific for an allocator driver. Only such file descriptor are +exchanged. The descriptors and meta-information are passed in &v4l2-buffer; (or +in &v4l2-plane; in the multi-planar API case). The driver must be switched +into DMABUF I/O mode by calling the &VIDIOC-REQBUFS; with the desired buffer +type.</para> + + <example> + <title>Initiating streaming I/O with DMABUF file descriptors</title> + + <programlisting> +&v4l2-requestbuffers; reqbuf; + +memset(&reqbuf, 0, sizeof (reqbuf)); +reqbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; +reqbuf.memory = V4L2_MEMORY_DMABUF; +reqbuf.count = 1; + +if (ioctl(fd, &VIDIOC-REQBUFS;, &reqbuf) == -1) { + if (errno == EINVAL) + printf("Video capturing or DMABUF streaming is not supported\n"); + else + perror("VIDIOC_REQBUFS"); + + exit(EXIT_FAILURE); +} + </programlisting> + </example> + + <para>The buffer (plane) file descriptor is passed on the fly with the +&VIDIOC-QBUF; ioctl. In case of multiplanar buffers, every plane can be +associated with a different DMABUF descriptor. Although buffers are commonly +cycled, applications can pass a different DMABUF descriptor at each +<constant>VIDIOC_QBUF</constant> call.</para> + + <example> + <title>Queueing DMABUF using single plane API</title> + + <programlisting> +int buffer_queue(int v4lfd, int index, int dmafd) +{ + &v4l2-buffer; buf; + + memset(&buf, 0, sizeof buf); + buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + buf.memory = V4L2_MEMORY_DMABUF; + buf.index = index; + buf.m.fd = dmafd; + + if (ioctl(v4lfd, &VIDIOC-QBUF;, &buf) == -1) { + perror("VIDIOC_QBUF"); + return -1; + } + + return 0; +} + </programlisting> + </example> + + <example> + <title>Queueing DMABUF using multi plane API</title> + + <programlisting> +int buffer_queue_mp(int v4lfd, int index, int dmafd[], int n_planes) +{ + &v4l2-buffer; buf; + &v4l2-plane; planes[VIDEO_MAX_PLANES]; + int i; + + memset(&buf, 0, sizeof buf); + buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE; + buf.memory = V4L2_MEMORY_DMABUF; + buf.index = index; + buf.m.planes = planes; + buf.length = n_planes; + + memset(&planes, 0, sizeof planes); + + for (i = 0; i < n_planes; ++i) + buf.m.planes[i].m.fd = dmafd[i]; + + if (ioctl(v4lfd, &VIDIOC-QBUF;, &buf) == -1) { + perror("VIDIOC_QBUF"); + return -1; + } + + return 0; +} + </programlisting> + </example> + + <para>Captured or displayed buffers are dequeued with the +&VIDIOC-DQBUF; ioctl. The driver can unlock the buffer at any +time between the completion of the DMA and this ioctl. The memory is +also unlocked when &VIDIOC-STREAMOFF; is called, &VIDIOC-REQBUFS;, or +when the device is closed.</para> + + <para>For capturing applications it is customary to enqueue a +number of empty buffers, to start capturing and enter the read loop. +Here the application waits until a filled buffer can be dequeued, and +re-enqueues the buffer when the data is no longer needed. Output +applications fill and enqueue buffers, when enough buffers are stacked +up output is started. In the write loop, when the application +runs out of free buffers it must wait until an empty buffer can be +dequeued and reused. Two methods exist to suspend execution of the +application until one or more buffers can be dequeued. By default +<constant>VIDIOC_DQBUF</constant> blocks when no buffer is in the +outgoing queue. When the <constant>O_NONBLOCK</constant> flag was +given to the &func-open; function, <constant>VIDIOC_DQBUF</constant> +returns immediately with an &EAGAIN; when no buffer is available. The +&func-select; and &func-poll; functions are always available.</para> + + <para>To start and stop capturing or displaying applications call the +&VIDIOC-STREAMON; and &VIDIOC-STREAMOFF; ioctls. Note that +<constant>VIDIOC_STREAMOFF</constant> removes all buffers from both queues and +unlocks all buffers as a side effect. Since there is no notion of doing +anything "now" on a multitasking system, if an application needs to synchronize +with another event it should examine the &v4l2-buffer; +<structfield>timestamp</structfield> of captured or outputted buffers.</para> + + <para>Drivers implementing DMABUF importing I/O must support the +<constant>VIDIOC_REQBUFS</constant>, <constant>VIDIOC_QBUF</constant>, +<constant>VIDIOC_DQBUF</constant>, <constant>VIDIOC_STREAMON</constant> and +<constant>VIDIOC_STREAMOFF</constant> ioctls, and the +<function>select()</function> and <function>poll()</function> functions.</para> + + </section> + + <section id="async"> + <title>Asynchronous I/O</title> + + <para>This method is not defined yet.</para> + </section> + + <section id="buffer"> + <title>Buffers</title> + + <para>A buffer contains data exchanged by application and +driver using one of the Streaming I/O methods. In the multi-planar API, the +data is held in planes, while the buffer structure acts as a container +for the planes. Only pointers to buffers (planes) are exchanged, the data +itself is not copied. These pointers, together with meta-information like +timestamps or field parity, are stored in a struct +<structname>v4l2_buffer</structname>, argument to +the &VIDIOC-QUERYBUF;, &VIDIOC-QBUF; and &VIDIOC-DQBUF; ioctl. +In the multi-planar API, some plane-specific members of struct +<structname>v4l2_buffer</structname>, such as pointers and sizes for each +plane, are stored in struct <structname>v4l2_plane</structname> instead. +In that case, struct <structname>v4l2_buffer</structname> contains an array of +plane structures.</para> + + <para>Dequeued video buffers come with timestamps. The driver + decides at which part of the frame and with which clock the + timestamp is taken. Please see flags in the masks + <constant>V4L2_BUF_FLAG_TIMESTAMP_MASK</constant> and + <constant>V4L2_BUF_FLAG_TSTAMP_SRC_MASK</constant> in <xref + linkend="buffer-flags" />. These flags are always valid and constant + across all buffers during the whole video stream. Changes in these + flags may take place as a side effect of &VIDIOC-S-INPUT; or + &VIDIOC-S-OUTPUT; however. The + <constant>V4L2_BUF_FLAG_TIMESTAMP_COPY</constant> timestamp type + which is used by e.g. on mem-to-mem devices is an exception to the + rule: the timestamp source flags are copied from the OUTPUT video + buffer to the CAPTURE video buffer.</para> + + <table frame="none" pgwide="1" id="v4l2-buffer"> + <title>struct <structname>v4l2_buffer</structname></title> + <tgroup cols="4"> + &cs-ustr; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>index</structfield></entry> + <entry></entry> + <entry>Number of the buffer, set by the application except +when calling &VIDIOC-DQBUF;, then it is set by the driver. +This field can range from zero to the number of buffers allocated +with the &VIDIOC-REQBUFS; ioctl (&v4l2-requestbuffers; <structfield>count</structfield>), +plus any buffers allocated with &VIDIOC-CREATE-BUFS; minus one.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>type</structfield></entry> + <entry></entry> + <entry>Type of the buffer, same as &v4l2-format; +<structfield>type</structfield> or &v4l2-requestbuffers; +<structfield>type</structfield>, set by the application. See <xref +linkend="v4l2-buf-type" /></entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>bytesused</structfield></entry> + <entry></entry> + <entry>The number of bytes occupied by the data in the +buffer. It depends on the negotiated data format and may change with +each buffer for compressed variable size data like JPEG images. +Drivers must set this field when <structfield>type</structfield> +refers to an input stream, applications when it refers to an output stream. +If the application sets this to 0 for an output stream, then +<structfield>bytesused</structfield> will be set to the size of the +buffer (see the <structfield>length</structfield> field of this struct) by +the driver. For multiplanar formats this field is ignored and the +<structfield>planes</structfield> pointer is used instead.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>flags</structfield></entry> + <entry></entry> + <entry>Flags set by the application or driver, see <xref +linkend="buffer-flags" />.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>field</structfield></entry> + <entry></entry> + <entry>Indicates the field order of the image in the +buffer, see <xref linkend="v4l2-field" />. This field is not used when +the buffer contains VBI data. Drivers must set it when +<structfield>type</structfield> refers to an input stream, +applications when it refers to an output stream.</entry> + </row> + <row> + <entry>struct timeval</entry> + <entry><structfield>timestamp</structfield></entry> + <entry></entry> + <entry><para>For input streams this is time when the first data + byte was captured, as returned by the + <function>clock_gettime()</function> function for the relevant + clock id; see <constant>V4L2_BUF_FLAG_TIMESTAMP_*</constant> in + <xref linkend="buffer-flags" />. For output streams the driver + stores the time at which the last data byte was actually sent out + in the <structfield>timestamp</structfield> field. This permits + applications to monitor the drift between the video and system + clock. For output streams that use <constant>V4L2_BUF_FLAG_TIMESTAMP_COPY</constant> + the application has to fill in the timestamp which will be copied + by the driver to the capture stream.</para></entry> + </row> + <row> + <entry>&v4l2-timecode;</entry> + <entry><structfield>timecode</structfield></entry> + <entry></entry> + <entry>When <structfield>type</structfield> is +<constant>V4L2_BUF_TYPE_VIDEO_CAPTURE</constant> and the +<constant>V4L2_BUF_FLAG_TIMECODE</constant> flag is set in +<structfield>flags</structfield>, this structure contains a frame +timecode. In <link linkend="v4l2-field">V4L2_FIELD_ALTERNATE</link> +mode the top and bottom field contain the same timecode. +Timecodes are intended to help video editing and are typically recorded on +video tapes, but also embedded in compressed formats like MPEG. This +field is independent of the <structfield>timestamp</structfield> and +<structfield>sequence</structfield> fields.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>sequence</structfield></entry> + <entry></entry> + <entry>Set by the driver, counting the frames (not fields!) in +sequence. This field is set for both input and output devices.</entry> + </row> + <row> + <entry spanname="hspan"><para>In <link +linkend="v4l2-field">V4L2_FIELD_ALTERNATE</link> mode the top and +bottom field have the same sequence number. The count starts at zero +and includes dropped or repeated frames. A dropped frame was received +by an input device but could not be stored due to lack of free buffer +space. A repeated frame was displayed again by an output device +because the application did not pass new data in +time.</para><para>Note this may count the frames received +e.g. over USB, without taking into account the frames dropped by the +remote hardware due to limited compression throughput or bus +bandwidth. These devices identify by not enumerating any video +standards, see <xref linkend="standard" />.</para></entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>memory</structfield></entry> + <entry></entry> + <entry>This field must be set by applications and/or drivers +in accordance with the selected I/O method. See <xref linkend="v4l2-memory" + /></entry> + </row> + <row> + <entry>union</entry> + <entry><structfield>m</structfield></entry> + </row> + <row> + <entry></entry> + <entry>__u32</entry> + <entry><structfield>offset</structfield></entry> + <entry>For the single-planar API and when +<structfield>memory</structfield> is <constant>V4L2_MEMORY_MMAP</constant> this +is the offset of the buffer from the start of the device memory. The value is +returned by the driver and apart of serving as parameter to the &func-mmap; +function not useful for applications. See <xref linkend="mmap" /> for details + </entry> + </row> + <row> + <entry></entry> + <entry>unsigned long</entry> + <entry><structfield>userptr</structfield></entry> + <entry>For the single-planar API and when +<structfield>memory</structfield> is <constant>V4L2_MEMORY_USERPTR</constant> +this is a pointer to the buffer (casted to unsigned long type) in virtual +memory, set by the application. See <xref linkend="userp" /> for details. + </entry> + </row> + <row> + <entry></entry> + <entry>struct v4l2_plane</entry> + <entry><structfield>*planes</structfield></entry> + <entry>When using the multi-planar API, contains a userspace pointer + to an array of &v4l2-plane;. The size of the array should be put + in the <structfield>length</structfield> field of this + <structname>v4l2_buffer</structname> structure.</entry> + </row> + <row> + <entry></entry> + <entry>int</entry> + <entry><structfield>fd</structfield></entry> + <entry>For the single-plane API and when +<structfield>memory</structfield> is <constant>V4L2_MEMORY_DMABUF</constant> this +is the file descriptor associated with a DMABUF buffer.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>length</structfield></entry> + <entry></entry> + <entry>Size of the buffer (not the payload) in bytes for the + single-planar API. This is set by the driver based on the calls to + &VIDIOC-REQBUFS; and/or &VIDIOC-CREATE-BUFS;. For the multi-planar API the application sets + this to the number of elements in the <structfield>planes</structfield> + array. The driver will fill in the actual number of valid elements in + that array. + </entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved2</structfield></entry> + <entry></entry> + <entry>A place holder for future extensions. Applications +should set this to 0.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield></entry> + <entry></entry> + <entry>A place holder for future extensions. Applications +should set this to 0.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table frame="none" pgwide="1" id="v4l2-plane"> + <title>struct <structname>v4l2_plane</structname></title> + <tgroup cols="4"> + &cs-ustr; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>bytesused</structfield></entry> + <entry></entry> + <entry>The number of bytes occupied by data in the plane + (its payload). Drivers must set this field when <structfield>type</structfield> + refers to an input stream, applications when it refers to an output stream. + If the application sets this to 0 for an output stream, then + <structfield>bytesused</structfield> will be set to the size of the + plane (see the <structfield>length</structfield> field of this struct) + by the driver.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>length</structfield></entry> + <entry></entry> + <entry>Size in bytes of the plane (not its payload). This is set by the driver + based on the calls to &VIDIOC-REQBUFS; and/or &VIDIOC-CREATE-BUFS;.</entry> + </row> + <row> + <entry>union</entry> + <entry><structfield>m</structfield></entry> + <entry></entry> + <entry></entry> + </row> + <row> + <entry></entry> + <entry>__u32</entry> + <entry><structfield>mem_offset</structfield></entry> + <entry>When the memory type in the containing &v4l2-buffer; is + <constant>V4L2_MEMORY_MMAP</constant>, this is the value that + should be passed to &func-mmap;, similar to the + <structfield>offset</structfield> field in &v4l2-buffer;.</entry> + </row> + <row> + <entry></entry> + <entry>unsigned long</entry> + <entry><structfield>userptr</structfield></entry> + <entry>When the memory type in the containing &v4l2-buffer; is + <constant>V4L2_MEMORY_USERPTR</constant>, this is a userspace + pointer to the memory allocated for this plane by an application. + </entry> + </row> + <row> + <entry></entry> + <entry>int</entry> + <entry><structfield>fd</structfield></entry> + <entry>When the memory type in the containing &v4l2-buffer; is + <constant>V4L2_MEMORY_DMABUF</constant>, this is a file + descriptor associated with a DMABUF buffer, similar to the + <structfield>fd</structfield> field in &v4l2-buffer;.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>data_offset</structfield></entry> + <entry></entry> + <entry>Offset in bytes to video data in the plane. + Drivers must set this field when <structfield>type</structfield> + refers to an input stream, applications when it refers to an output stream. + </entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved[11]</structfield></entry> + <entry></entry> + <entry>Reserved for future use. Should be zeroed by an + application.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table frame="none" pgwide="1" id="v4l2-buf-type"> + <title>enum v4l2_buf_type</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_BUF_TYPE_VIDEO_CAPTURE</constant></entry> + <entry>1</entry> + <entry>Buffer of a single-planar video capture stream, see <xref + linkend="capture" />.</entry> + </row> + <row> + <entry><constant>V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE</constant> + </entry> + <entry>9</entry> + <entry>Buffer of a multi-planar video capture stream, see <xref + linkend="capture" />.</entry> + </row> + <row> + <entry><constant>V4L2_BUF_TYPE_VIDEO_OUTPUT</constant></entry> + <entry>2</entry> + <entry>Buffer of a single-planar video output stream, see <xref + linkend="output" />.</entry> + </row> + <row> + <entry><constant>V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE</constant> + </entry> + <entry>10</entry> + <entry>Buffer of a multi-planar video output stream, see <xref + linkend="output" />.</entry> + </row> + <row> + <entry><constant>V4L2_BUF_TYPE_VIDEO_OVERLAY</constant></entry> + <entry>3</entry> + <entry>Buffer for video overlay, see <xref linkend="overlay" />.</entry> + </row> + <row> + <entry><constant>V4L2_BUF_TYPE_VBI_CAPTURE</constant></entry> + <entry>4</entry> + <entry>Buffer of a raw VBI capture stream, see <xref + linkend="raw-vbi" />.</entry> + </row> + <row> + <entry><constant>V4L2_BUF_TYPE_VBI_OUTPUT</constant></entry> + <entry>5</entry> + <entry>Buffer of a raw VBI output stream, see <xref + linkend="raw-vbi" />.</entry> + </row> + <row> + <entry><constant>V4L2_BUF_TYPE_SLICED_VBI_CAPTURE</constant></entry> + <entry>6</entry> + <entry>Buffer of a sliced VBI capture stream, see <xref + linkend="sliced" />.</entry> + </row> + <row> + <entry><constant>V4L2_BUF_TYPE_SLICED_VBI_OUTPUT</constant></entry> + <entry>7</entry> + <entry>Buffer of a sliced VBI output stream, see <xref + linkend="sliced" />.</entry> + </row> + <row> + <entry><constant>V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY</constant></entry> + <entry>8</entry> + <entry>Buffer for video output overlay (OSD), see <xref + linkend="osd" />.</entry> + </row> + <row> + <entry><constant>V4L2_BUF_TYPE_SDR_CAPTURE</constant></entry> + <entry>11</entry> + <entry>Buffer for Software Defined Radio (SDR), see <xref + linkend="sdr" />.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table frame="none" pgwide="1" id="buffer-flags"> + <title>Buffer Flags</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_BUF_FLAG_MAPPED</constant></entry> + <entry>0x00000001</entry> + <entry>The buffer resides in device memory and has been mapped +into the application's address space, see <xref linkend="mmap" /> for details. +Drivers set or clear this flag when the +<link linkend="vidioc-querybuf">VIDIOC_QUERYBUF</link>, <link + linkend="vidioc-qbuf">VIDIOC_QBUF</link> or <link + linkend="vidioc-qbuf">VIDIOC_DQBUF</link> ioctl is called. Set by the driver.</entry> + </row> + <row> + <entry><constant>V4L2_BUF_FLAG_QUEUED</constant></entry> + <entry>0x00000002</entry> + <entry>Internally drivers maintain two buffer queues, an +incoming and outgoing queue. When this flag is set, the buffer is +currently on the incoming queue. It automatically moves to the +outgoing queue after the buffer has been filled (capture devices) or +displayed (output devices). Drivers set or clear this flag when the +<constant>VIDIOC_QUERYBUF</constant> ioctl is called. After +(successful) calling the <constant>VIDIOC_QBUF </constant>ioctl it is +always set and after <constant>VIDIOC_DQBUF</constant> always +cleared.</entry> + </row> + <row> + <entry><constant>V4L2_BUF_FLAG_DONE</constant></entry> + <entry>0x00000004</entry> + <entry>When this flag is set, the buffer is currently on +the outgoing queue, ready to be dequeued from the driver. Drivers set +or clear this flag when the <constant>VIDIOC_QUERYBUF</constant> ioctl +is called. After calling the <constant>VIDIOC_QBUF</constant> or +<constant>VIDIOC_DQBUF</constant> it is always cleared. Of course a +buffer cannot be on both queues at the same time, the +<constant>V4L2_BUF_FLAG_QUEUED</constant> and +<constant>V4L2_BUF_FLAG_DONE</constant> flag are mutually exclusive. +They can be both cleared however, then the buffer is in "dequeued" +state, in the application domain so to say.</entry> + </row> + <row> + <entry><constant>V4L2_BUF_FLAG_ERROR</constant></entry> + <entry>0x00000040</entry> + <entry>When this flag is set, the buffer has been dequeued + successfully, although the data might have been corrupted. + This is recoverable, streaming may continue as normal and + the buffer may be reused normally. + Drivers set this flag when the <constant>VIDIOC_DQBUF</constant> + ioctl is called.</entry> + </row> + <row> + <entry><constant>V4L2_BUF_FLAG_KEYFRAME</constant></entry> + <entry>0x00000008</entry> + <entry>Drivers set or clear this flag when calling the +<constant>VIDIOC_DQBUF</constant> ioctl. It may be set by video +capture devices when the buffer contains a compressed image which is a +key frame (or field), &ie; can be decompressed on its own. Also know as +an I-frame. Applications can set this bit when <structfield>type</structfield> +refers to an output stream.</entry> + </row> + <row> + <entry><constant>V4L2_BUF_FLAG_PFRAME</constant></entry> + <entry>0x00000010</entry> + <entry>Similar to <constant>V4L2_BUF_FLAG_KEYFRAME</constant> +this flags predicted frames or fields which contain only differences to a +previous key frame. Applications can set this bit when <structfield>type</structfield> +refers to an output stream.</entry> + </row> + <row> + <entry><constant>V4L2_BUF_FLAG_BFRAME</constant></entry> + <entry>0x00000020</entry> + <entry>Similar to <constant>V4L2_BUF_FLAG_KEYFRAME</constant> +this flags a bi-directional predicted frame or field which contains only +the differences between the current frame and both the preceding and following +key frames to specify its content. Applications can set this bit when +<structfield>type</structfield> refers to an output stream.</entry> + </row> + <row> + <entry><constant>V4L2_BUF_FLAG_TIMECODE</constant></entry> + <entry>0x00000100</entry> + <entry>The <structfield>timecode</structfield> field is valid. +Drivers set or clear this flag when the <constant>VIDIOC_DQBUF</constant> +ioctl is called. Applications can set this bit and the corresponding +<structfield>timecode</structfield> structure when <structfield>type</structfield> +refers to an output stream.</entry> + </row> + <row> + <entry><constant>V4L2_BUF_FLAG_PREPARED</constant></entry> + <entry>0x00000400</entry> + <entry>The buffer has been prepared for I/O and can be queued by the +application. Drivers set or clear this flag when the +<link linkend="vidioc-querybuf">VIDIOC_QUERYBUF</link>, <link + linkend="vidioc-qbuf">VIDIOC_PREPARE_BUF</link>, <link + linkend="vidioc-qbuf">VIDIOC_QBUF</link> or <link + linkend="vidioc-qbuf">VIDIOC_DQBUF</link> ioctl is called.</entry> + </row> + <row> + <entry><constant>V4L2_BUF_FLAG_NO_CACHE_INVALIDATE</constant></entry> + <entry>0x00000800</entry> + <entry>Caches do not have to be invalidated for this buffer. +Typically applications shall use this flag if the data captured in the buffer +is not going to be touched by the CPU, instead the buffer will, probably, be +passed on to a DMA-capable hardware unit for further processing or output. +</entry> + </row> + <row> + <entry><constant>V4L2_BUF_FLAG_NO_CACHE_CLEAN</constant></entry> + <entry>0x00001000</entry> + <entry>Caches do not have to be cleaned for this buffer. +Typically applications shall use this flag for output buffers if the data +in this buffer has not been created by the CPU but by some DMA-capable unit, +in which case caches have not been used.</entry> + </row> + <row> + <entry><constant>V4L2_BUF_FLAG_TIMESTAMP_MASK</constant></entry> + <entry>0x0000e000</entry> + <entry>Mask for timestamp types below. To test the + timestamp type, mask out bits not belonging to timestamp + type by performing a logical and operation with buffer + flags and timestamp mask.</entry> + </row> + <row> + <entry><constant>V4L2_BUF_FLAG_TIMESTAMP_UNKNOWN</constant></entry> + <entry>0x00000000</entry> + <entry>Unknown timestamp type. This type is used by + drivers before Linux 3.9 and may be either monotonic (see + below) or realtime (wall clock). Monotonic clock has been + favoured in embedded systems whereas most of the drivers + use the realtime clock. Either kinds of timestamps are + available in user space via + <function>clock_gettime(2)</function> using clock IDs + <constant>CLOCK_MONOTONIC</constant> and + <constant>CLOCK_REALTIME</constant>, respectively.</entry> + </row> + <row> + <entry><constant>V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC</constant></entry> + <entry>0x00002000</entry> + <entry>The buffer timestamp has been taken from the + <constant>CLOCK_MONOTONIC</constant> clock. To access the + same clock outside V4L2, use + <function>clock_gettime(2)</function> .</entry> + </row> + <row> + <entry><constant>V4L2_BUF_FLAG_TIMESTAMP_COPY</constant></entry> + <entry>0x00004000</entry> + <entry>The CAPTURE buffer timestamp has been taken from the + corresponding OUTPUT buffer. This flag applies only to mem2mem devices.</entry> + </row> + <row> + <entry><constant>V4L2_BUF_FLAG_TSTAMP_SRC_MASK</constant></entry> + <entry>0x00070000</entry> + <entry>Mask for timestamp sources below. The timestamp source + defines the point of time the timestamp is taken in relation to + the frame. Logical 'and' operation between the + <structfield>flags</structfield> field and + <constant>V4L2_BUF_FLAG_TSTAMP_SRC_MASK</constant> produces the + value of the timestamp source. Applications must set the timestamp + source when <structfield>type</structfield> refers to an output stream + and <constant>V4L2_BUF_FLAG_TIMESTAMP_COPY</constant> is set.</entry> + </row> + <row> + <entry><constant>V4L2_BUF_FLAG_TSTAMP_SRC_EOF</constant></entry> + <entry>0x00000000</entry> + <entry>End Of Frame. The buffer timestamp has been taken + when the last pixel of the frame has been received or the + last pixel of the frame has been transmitted. In practice, + software generated timestamps will typically be read from + the clock a small amount of time after the last pixel has + been received or transmitten, depending on the system and + other activity in it.</entry> + </row> + <row> + <entry><constant>V4L2_BUF_FLAG_TSTAMP_SRC_SOE</constant></entry> + <entry>0x00010000</entry> + <entry>Start Of Exposure. The buffer timestamp has been + taken when the exposure of the frame has begun. This is + only valid for the + <constant>V4L2_BUF_TYPE_VIDEO_CAPTURE</constant> buffer + type.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="v4l2-memory"> + <title>enum v4l2_memory</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_MEMORY_MMAP</constant></entry> + <entry>1</entry> + <entry>The buffer is used for <link linkend="mmap">memory +mapping</link> I/O.</entry> + </row> + <row> + <entry><constant>V4L2_MEMORY_USERPTR</constant></entry> + <entry>2</entry> + <entry>The buffer is used for <link linkend="userp">user +pointer</link> I/O.</entry> + </row> + <row> + <entry><constant>V4L2_MEMORY_OVERLAY</constant></entry> + <entry>3</entry> + <entry>[to do]</entry> + </row> + <row> + <entry><constant>V4L2_MEMORY_DMABUF</constant></entry> + <entry>4</entry> + <entry>The buffer is used for <link linkend="dmabuf">DMA shared +buffer</link> I/O.</entry> + </row> + </tbody> + </tgroup> + </table> + + <section> + <title>Timecodes</title> + + <para>The <structname>v4l2_timecode</structname> structure is +designed to hold a <xref linkend="smpte12m" /> or similar timecode. +(struct <structname>timeval</structname> timestamps are stored in +&v4l2-buffer; field <structfield>timestamp</structfield>.)</para> + + <table frame="none" pgwide="1" id="v4l2-timecode"> + <title>struct <structname>v4l2_timecode</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>type</structfield></entry> + <entry>Frame rate the timecodes are based on, see <xref + linkend="timecode-type" />.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>flags</structfield></entry> + <entry>Timecode flags, see <xref linkend="timecode-flags" />.</entry> + </row> + <row> + <entry>__u8</entry> + <entry><structfield>frames</structfield></entry> + <entry>Frame count, 0 ... 23/24/29/49/59, depending on the + type of timecode.</entry> + </row> + <row> + <entry>__u8</entry> + <entry><structfield>seconds</structfield></entry> + <entry>Seconds count, 0 ... 59. This is a binary, not BCD number.</entry> + </row> + <row> + <entry>__u8</entry> + <entry><structfield>minutes</structfield></entry> + <entry>Minutes count, 0 ... 59. This is a binary, not BCD number.</entry> + </row> + <row> + <entry>__u8</entry> + <entry><structfield>hours</structfield></entry> + <entry>Hours count, 0 ... 29. This is a binary, not BCD number.</entry> + </row> + <row> + <entry>__u8</entry> + <entry><structfield>userbits</structfield>[4]</entry> + <entry>The "user group" bits from the timecode.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table frame="none" pgwide="1" id="timecode-type"> + <title>Timecode Types</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_TC_TYPE_24FPS</constant></entry> + <entry>1</entry> + <entry>24 frames per second, i. e. film.</entry> + </row> + <row> + <entry><constant>V4L2_TC_TYPE_25FPS</constant></entry> + <entry>2</entry> + <entry>25 frames per second, &ie; PAL or SECAM video.</entry> + </row> + <row> + <entry><constant>V4L2_TC_TYPE_30FPS</constant></entry> + <entry>3</entry> + <entry>30 frames per second, &ie; NTSC video.</entry> + </row> + <row> + <entry><constant>V4L2_TC_TYPE_50FPS</constant></entry> + <entry>4</entry> + <entry></entry> + </row> + <row> + <entry><constant>V4L2_TC_TYPE_60FPS</constant></entry> + <entry>5</entry> + <entry></entry> + </row> + </tbody> + </tgroup> + </table> + + <table frame="none" pgwide="1" id="timecode-flags"> + <title>Timecode Flags</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_TC_FLAG_DROPFRAME</constant></entry> + <entry>0x0001</entry> + <entry>Indicates "drop frame" semantics for counting frames +in 29.97 fps material. When set, frame numbers 0 and 1 at the start of +each minute, except minutes 0, 10, 20, 30, 40, 50 are omitted from the +count.</entry> + </row> + <row> + <entry><constant>V4L2_TC_FLAG_COLORFRAME</constant></entry> + <entry>0x0002</entry> + <entry>The "color frame" flag.</entry> + </row> + <row> + <entry><constant>V4L2_TC_USERBITS_field</constant></entry> + <entry>0x000C</entry> + <entry>Field mask for the "binary group flags".</entry> + </row> + <row> + <entry><constant>V4L2_TC_USERBITS_USERDEFINED</constant></entry> + <entry>0x0000</entry> + <entry>Unspecified format.</entry> + </row> + <row> + <entry><constant>V4L2_TC_USERBITS_8BITCHARS</constant></entry> + <entry>0x0008</entry> + <entry>8-bit ISO characters.</entry> + </row> + </tbody> + </tgroup> + </table> + </section> + </section> + + <section id="field-order"> + <title>Field Order</title> + + <para>We have to distinguish between progressive and interlaced +video. Progressive video transmits all lines of a video image +sequentially. Interlaced video divides an image into two fields, +containing only the odd and even lines of the image, respectively. +Alternating the so called odd and even field are transmitted, and due +to a small delay between fields a cathode ray TV displays the lines +interleaved, yielding the original frame. This curious technique was +invented because at refresh rates similar to film the image would +fade out too quickly. Transmitting fields reduces the flicker without +the necessity of doubling the frame rate and with it the bandwidth +required for each channel.</para> + + <para>It is important to understand a video camera does not expose +one frame at a time, merely transmitting the frames separated into +fields. The fields are in fact captured at two different instances in +time. An object on screen may well move between one field and the +next. For applications analysing motion it is of paramount importance +to recognize which field of a frame is older, the <emphasis>temporal +order</emphasis>.</para> + + <para>When the driver provides or accepts images field by field +rather than interleaved, it is also important applications understand +how the fields combine to frames. We distinguish between top (aka odd) and +bottom (aka even) fields, the <emphasis>spatial order</emphasis>: The first line +of the top field is the first line of an interlaced frame, the first +line of the bottom field is the second line of that frame.</para> + + <para>However because fields were captured one after the other, +arguing whether a frame commences with the top or bottom field is +pointless. Any two successive top and bottom, or bottom and top fields +yield a valid frame. Only when the source was progressive to begin +with, ⪚ when transferring film to video, two fields may come from +the same frame, creating a natural order.</para> + + <para>Counter to intuition the top field is not necessarily the +older field. Whether the older field contains the top or bottom lines +is a convention determined by the video standard. Hence the +distinction between temporal and spatial order of fields. The diagrams +below should make this clearer.</para> + + <para>All video capture and output devices must report the current +field order. Some drivers may permit the selection of a different +order, to this end applications initialize the +<structfield>field</structfield> field of &v4l2-pix-format; before +calling the &VIDIOC-S-FMT; ioctl. If this is not desired it should +have the value <constant>V4L2_FIELD_ANY</constant> (0).</para> + + <table frame="none" pgwide="1" id="v4l2-field"> + <title>enum v4l2_field</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_FIELD_ANY</constant></entry> + <entry>0</entry> + <entry>Applications request this field order when any +one of the <constant>V4L2_FIELD_NONE</constant>, +<constant>V4L2_FIELD_TOP</constant>, +<constant>V4L2_FIELD_BOTTOM</constant>, or +<constant>V4L2_FIELD_INTERLACED</constant> formats is acceptable. +Drivers choose depending on hardware capabilities or e. g. the +requested image size, and return the actual field order. &v4l2-buffer; +<structfield>field</structfield> can never be +<constant>V4L2_FIELD_ANY</constant>.</entry> + </row> + <row> + <entry><constant>V4L2_FIELD_NONE</constant></entry> + <entry>1</entry> + <entry>Images are in progressive format, not interlaced. +The driver may also indicate this order when it cannot distinguish +between <constant>V4L2_FIELD_TOP</constant> and +<constant>V4L2_FIELD_BOTTOM</constant>.</entry> + </row> + <row> + <entry><constant>V4L2_FIELD_TOP</constant></entry> + <entry>2</entry> + <entry>Images consist of the top (aka odd) field only.</entry> + </row> + <row> + <entry><constant>V4L2_FIELD_BOTTOM</constant></entry> + <entry>3</entry> + <entry>Images consist of the bottom (aka even) field only. +Applications may wish to prevent a device from capturing interlaced +images because they will have "comb" or "feathering" artefacts around +moving objects.</entry> + </row> + <row> + <entry><constant>V4L2_FIELD_INTERLACED</constant></entry> + <entry>4</entry> + <entry>Images contain both fields, interleaved line by +line. The temporal order of the fields (whether the top or bottom +field is first transmitted) depends on the current video standard. +M/NTSC transmits the bottom field first, all other standards the top +field first.</entry> + </row> + <row> + <entry><constant>V4L2_FIELD_SEQ_TB</constant></entry> + <entry>5</entry> + <entry>Images contain both fields, the top field lines +are stored first in memory, immediately followed by the bottom field +lines. Fields are always stored in temporal order, the older one first +in memory. Image sizes refer to the frame, not fields.</entry> + </row> + <row> + <entry><constant>V4L2_FIELD_SEQ_BT</constant></entry> + <entry>6</entry> + <entry>Images contain both fields, the bottom field +lines are stored first in memory, immediately followed by the top +field lines. Fields are always stored in temporal order, the older one +first in memory. Image sizes refer to the frame, not fields.</entry> + </row> + <row> + <entry><constant>V4L2_FIELD_ALTERNATE</constant></entry> + <entry>7</entry> + <entry>The two fields of a frame are passed in separate +buffers, in temporal order, &ie; the older one first. To indicate the field +parity (whether the current field is a top or bottom field) the driver +or application, depending on data direction, must set &v4l2-buffer; +<structfield>field</structfield> to +<constant>V4L2_FIELD_TOP</constant> or +<constant>V4L2_FIELD_BOTTOM</constant>. Any two successive fields pair +to build a frame. If fields are successive, without any dropped fields +between them (fields can drop individually), can be determined from +the &v4l2-buffer; <structfield>sequence</structfield> field. This format +cannot be selected when using the read/write I/O method since there +is no way to communicate if a field was a top or bottom field.</entry> + </row> + <row> + <entry><constant>V4L2_FIELD_INTERLACED_TB</constant></entry> + <entry>8</entry> + <entry>Images contain both fields, interleaved line by +line, top field first. The top field is transmitted first.</entry> + </row> + <row> + <entry><constant>V4L2_FIELD_INTERLACED_BT</constant></entry> + <entry>9</entry> + <entry>Images contain both fields, interleaved line by +line, top field first. The bottom field is transmitted first.</entry> + </row> + </tbody> + </tgroup> + </table> + + <figure id="fieldseq-tb"> + <title>Field Order, Top Field First Transmitted</title> + <mediaobject> + <imageobject> + <imagedata fileref="fieldseq_tb.pdf" format="PS" /> + </imageobject> + <imageobject> + <imagedata fileref="fieldseq_tb.gif" format="GIF" /> + </imageobject> + </mediaobject> + </figure> + + <figure id="fieldseq-bt"> + <title>Field Order, Bottom Field First Transmitted</title> + <mediaobject> + <imageobject> + <imagedata fileref="fieldseq_bt.pdf" format="PS" /> + </imageobject> + <imageobject> + <imagedata fileref="fieldseq_bt.gif" format="GIF" /> + </imageobject> + </mediaobject> + </figure> + </section> diff --git a/Documentation/DocBook/media/v4l/keytable.c.xml b/Documentation/DocBook/media/v4l/keytable.c.xml new file mode 100644 index 00000000000..d53254a3be1 --- /dev/null +++ b/Documentation/DocBook/media/v4l/keytable.c.xml @@ -0,0 +1,172 @@ +<programlisting> +/* keytable.c - This program allows checking/replacing keys at IR + + Copyright (C) 2006-2009 Mauro Carvalho Chehab <mchehab@infradead.org> + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, version 2 of the License. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + */ + +#include <ctype.h> +#include <errno.h> +#include <fcntl.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <linux/input.h> +#include <sys/ioctl.h> + +#include "parse.h" + +void prtcode (int *codes) +{ + struct parse_key *p; + + for (p=keynames;p->name!=NULL;p++) { + if (p->value == (unsigned)codes[1]) { + printf("scancode 0x%04x = %s (0x%02x)\n", codes[0], p->name, codes[1]); + return; + } + } + + if (isprint (codes[1])) + printf("scancode %d = '%c' (0x%02x)\n", codes[0], codes[1], codes[1]); + else + printf("scancode %d = 0x%02x\n", codes[0], codes[1]); +} + +int parse_code(char *string) +{ + struct parse_key *p; + + for (p=keynames;p->name!=NULL;p++) { + if (!strcasecmp(p->name, string)) { + return p->value; + } + } + return -1; +} + +int main (int argc, char *argv[]) +{ + int fd; + unsigned int i, j; + int codes[2]; + + if (argc<2 || argc>4) { + printf ("usage: %s <device> to get table; or\n" + " %s <device> <scancode> <keycode>\n" + " %s <device> <keycode_file>\n",*argv,*argv,*argv); + return -1; + } + + if ((fd = open(argv[1], O_RDONLY)) < 0) { + perror("Couldn't open input device"); + return(-1); + } + + if (argc==4) { + int value; + + value=parse_code(argv[3]); + + if (value==-1) { + value = strtol(argv[3], NULL, 0); + if (errno) + perror("value"); + } + + codes [0] = (unsigned) strtol(argv[2], NULL, 0); + codes [1] = (unsigned) value; + + if(ioctl(fd, EVIOCSKEYCODE, codes)) + perror ("EVIOCSKEYCODE"); + + if(ioctl(fd, EVIOCGKEYCODE, codes)==0) + prtcode(codes); + return 0; + } + + if (argc==3) { + FILE *fin; + int value; + char *scancode, *keycode, s[2048]; + + fin=fopen(argv[2],"r"); + if (fin==NULL) { + perror ("opening keycode file"); + return -1; + } + + /* Clears old table */ + for (j = 0; j < 256; j++) { + for (i = 0; i < 256; i++) { + codes[0] = (j << 8) | i; + codes[1] = KEY_RESERVED; + ioctl(fd, EVIOCSKEYCODE, codes); + } + } + + while (fgets(s,sizeof(s),fin)) { + scancode=strtok(s,"\n\t =:"); + if (!scancode) { + perror ("parsing input file scancode"); + return -1; + } + if (!strcasecmp(scancode, "scancode")) { + scancode = strtok(NULL,"\n\t =:"); + if (!scancode) { + perror ("parsing input file scancode"); + return -1; + } + } + + keycode=strtok(NULL,"\n\t =:("); + if (!keycode) { + perror ("parsing input file keycode"); + return -1; + } + + // printf ("parsing %s=%s:", scancode, keycode); + value=parse_code(keycode); + // printf ("\tvalue=%d\n",value); + + if (value==-1) { + value = strtol(keycode, NULL, 0); + if (errno) + perror("value"); + } + + codes [0] = (unsigned) strtol(scancode, NULL, 0); + codes [1] = (unsigned) value; + + // printf("\t%04x=%04x\n",codes[0], codes[1]); + if(ioctl(fd, EVIOCSKEYCODE, codes)) { + fprintf(stderr, "Setting scancode 0x%04x with 0x%04x via ",codes[0], codes[1]); + perror ("EVIOCSKEYCODE"); + } + + if(ioctl(fd, EVIOCGKEYCODE, codes)==0) + prtcode(codes); + } + return 0; + } + + /* Get scancode table */ + for (j = 0; j < 256; j++) { + for (i = 0; i < 256; i++) { + codes[0] = (j << 8) | i; + if (!ioctl(fd, EVIOCGKEYCODE, codes) && codes[1] != KEY_RESERVED) + prtcode(codes); + } + } + return 0; +} + +</programlisting> diff --git a/Documentation/DocBook/media/v4l/libv4l.xml b/Documentation/DocBook/media/v4l/libv4l.xml new file mode 100644 index 00000000000..d3b71e20003 --- /dev/null +++ b/Documentation/DocBook/media/v4l/libv4l.xml @@ -0,0 +1,160 @@ +<title>Libv4l Userspace Library</title> +<section id="libv4l-introduction"> + <title>Introduction</title> + + <para>libv4l is a collection of libraries which adds a thin abstraction +layer on top of video4linux2 devices. The purpose of this (thin) layer +is to make it easy for application writers to support a wide variety of +devices without having to write separate code for different devices in the +same class.</para> +<para>An example of using libv4l is provided by +<link linkend='v4l2grab-example'>v4l2grab</link>. +</para> + + <para>libv4l consists of 3 different libraries:</para> + <section> + <title>libv4lconvert</title> + + <para>libv4lconvert is a library that converts several +different pixelformats found in V4L2 drivers into a few common RGB and +YUY formats.</para> + <para>It currently accepts the following V4L2 driver formats: +<link linkend="V4L2-PIX-FMT-BGR24"><constant>V4L2_PIX_FMT_BGR24</constant></link>, +<link linkend="V4L2-PIX-FMT-HM12"><constant>V4L2_PIX_FMT_HM12</constant></link>, +<link linkend="V4L2-PIX-FMT-JPEG"><constant>V4L2_PIX_FMT_JPEG</constant></link>, +<link linkend="V4L2-PIX-FMT-MJPEG"><constant>V4L2_PIX_FMT_MJPEG</constant></link>, +<link linkend="V4L2-PIX-FMT-MR97310A"><constant>V4L2_PIX_FMT_MR97310A</constant></link>, +<link linkend="V4L2-PIX-FMT-OV511"><constant>V4L2_PIX_FMT_OV511</constant></link>, +<link linkend="V4L2-PIX-FMT-OV518"><constant>V4L2_PIX_FMT_OV518</constant></link>, +<link linkend="V4L2-PIX-FMT-PAC207"><constant>V4L2_PIX_FMT_PAC207</constant></link>, +<link linkend="V4L2-PIX-FMT-PJPG"><constant>V4L2_PIX_FMT_PJPG</constant></link>, +<link linkend="V4L2-PIX-FMT-RGB24"><constant>V4L2_PIX_FMT_RGB24</constant></link>, +<link linkend="V4L2-PIX-FMT-SBGGR8"><constant>V4L2_PIX_FMT_SBGGR8</constant></link>, +<link linkend="V4L2-PIX-FMT-SGBRG8"><constant>V4L2_PIX_FMT_SGBRG8</constant></link>, +<link linkend="V4L2-PIX-FMT-SGRBG8"><constant>V4L2_PIX_FMT_SGRBG8</constant></link>, +<link linkend="V4L2-PIX-FMT-SN9C10X"><constant>V4L2_PIX_FMT_SN9C10X</constant></link>, +<link linkend="V4L2-PIX-FMT-SN9C20X-I420"><constant>V4L2_PIX_FMT_SN9C20X_I420</constant></link>, +<link linkend="V4L2-PIX-FMT-SPCA501"><constant>V4L2_PIX_FMT_SPCA501</constant></link>, +<link linkend="V4L2-PIX-FMT-SPCA505"><constant>V4L2_PIX_FMT_SPCA505</constant></link>, +<link linkend="V4L2-PIX-FMT-SPCA508"><constant>V4L2_PIX_FMT_SPCA508</constant></link>, +<link linkend="V4L2-PIX-FMT-SPCA561"><constant>V4L2_PIX_FMT_SPCA561</constant></link>, +<link linkend="V4L2-PIX-FMT-SQ905C"><constant>V4L2_PIX_FMT_SQ905C</constant></link>, +<constant>V4L2_PIX_FMT_SRGGB8</constant>, +<link linkend="V4L2-PIX-FMT-UYVY"><constant>V4L2_PIX_FMT_UYVY</constant></link>, +<link linkend="V4L2-PIX-FMT-YUV420"><constant>V4L2_PIX_FMT_YUV420</constant></link>, +<link linkend="V4L2-PIX-FMT-YUYV"><constant>V4L2_PIX_FMT_YUYV</constant></link>, +<link linkend="V4L2-PIX-FMT-YVU420"><constant>V4L2_PIX_FMT_YVU420</constant></link>, +and <link linkend="V4L2-PIX-FMT-YVYU"><constant>V4L2_PIX_FMT_YVYU</constant></link>. +</para> + <para>Later on libv4lconvert was expanded to also be able to do +various video processing functions to improve webcam video quality. +The video processing is split in to 2 parts: libv4lconvert/control and +libv4lconvert/processing.</para> + + <para>The control part is used to offer video controls which can +be used to control the video processing functions made available by + libv4lconvert/processing. These controls are stored application wide +(until reboot) by using a persistent shared memory object.</para> + + <para>libv4lconvert/processing offers the actual video +processing functionality.</para> + </section> + <section> + <title>libv4l1</title> + <para>This library offers functions that can be used to quickly +make v4l1 applications work with v4l2 devices. These functions work exactly +like the normal open/close/etc, except that libv4l1 does full emulation of +the v4l1 api on top of v4l2 drivers, in case of v4l1 drivers it +will just pass calls through.</para> + <para>Since those functions are emulations of the old V4L1 API, +it shouldn't be used for new applications.</para> + </section> + <section> + <title>libv4l2</title> + <para>This library should be used for all modern V4L2 +applications.</para> + <para>It provides handles to call V4L2 open/ioctl/close/poll +methods. Instead of just providing the raw output of the device, it enhances +the calls in the sense that it will use libv4lconvert to provide more video +formats and to enhance the image quality.</para> + <para>In most cases, libv4l2 just passes the calls directly +through to the v4l2 driver, intercepting the calls to +<link linkend='vidioc-g-fmt'><constant>VIDIOC_TRY_FMT</constant></link>, +<link linkend='vidioc-g-fmt'><constant>VIDIOC_G_FMT</constant></link> +<link linkend='vidioc-g-fmt'><constant>VIDIOC_S_FMT</constant></link> +<link linkend='vidioc-enum-framesizes'><constant>VIDIOC_ENUM_FRAMESIZES</constant></link> +and <link linkend='vidioc-enum-frameintervals'><constant>VIDIOC_ENUM_FRAMEINTERVALS</constant></link> +in order to emulate the formats +<link linkend="V4L2-PIX-FMT-BGR24"><constant>V4L2_PIX_FMT_BGR24</constant></link>, +<link linkend="V4L2-PIX-FMT-RGB24"><constant>V4L2_PIX_FMT_RGB24</constant></link>, +<link linkend="V4L2-PIX-FMT-YUV420"><constant>V4L2_PIX_FMT_YUV420</constant></link>, +and <link linkend="V4L2-PIX-FMT-YVU420"><constant>V4L2_PIX_FMT_YVU420</constant></link>, +if they aren't available in the driver. +<link linkend='vidioc-enum-fmt'><constant>VIDIOC_ENUM_FMT</constant></link> +keeps enumerating the hardware supported formats, plus the emulated formats +offered by libv4l at the end. +</para> + <section id="libv4l-ops"> + <title>Libv4l device control functions</title> + <para>The common file operation methods are provided by +libv4l.</para> + <para>Those functions operate just like glibc +open/close/dup/ioctl/read/mmap/munmap:</para> +<itemizedlist><listitem> + <para>int v4l2_open(const char *file, int oflag, +...) - +operates like the standard <link linkend='func-open'>open()</link> function. +</para></listitem><listitem> + <para>int v4l2_close(int fd) - +operates like the standard <link linkend='func-close'>close()</link> function. +</para></listitem><listitem> + <para>int v4l2_dup(int fd) - +operates like the standard dup() function, duplicating a file handler. +</para></listitem><listitem> + <para>int v4l2_ioctl (int fd, unsigned long int request, ...) - +operates like the standard <link linkend='func-ioctl'>ioctl()</link> function. +</para></listitem><listitem> + <para>int v4l2_read (int fd, void* buffer, size_t n) - +operates like the standard <link linkend='func-read'>read()</link> function. +</para></listitem><listitem> + <para>void v4l2_mmap(void *start, size_t length, int prot, int flags, int fd, int64_t offset); - +operates like the standard <link linkend='func-mmap'>mmap()</link> function. +</para></listitem><listitem> + <para>int v4l2_munmap(void *_start, size_t length); - +operates like the standard <link linkend='func-munmap'>munmap()</link> function. +</para></listitem> +</itemizedlist> + <para>Those functions provide additional control:</para> +<itemizedlist><listitem> + <para>int v4l2_fd_open(int fd, int v4l2_flags) - +opens an already opened fd for further use through v4l2lib and possibly +modify libv4l2's default behavior through the v4l2_flags argument. +Currently, v4l2_flags can be <constant>V4L2_DISABLE_CONVERSION</constant>, +to disable format conversion. +</para></listitem><listitem> + <para>int v4l2_set_control(int fd, int cid, int value) - +This function takes a value of 0 - 65535, and then scales that range to +the actual range of the given v4l control id, and then if the cid exists +and is not locked sets the cid to the scaled value. +</para></listitem><listitem> + <para>int v4l2_get_control(int fd, int cid) - +This function returns a value of 0 - 65535, scaled to from the actual range +of the given v4l control id. when the cid does not exist, could not be +accessed for some reason, or some error occurred 0 is returned. +</para></listitem> +</itemizedlist> + </section> + </section> + <section> + + <title>v4l1compat.so wrapper library</title> + + <para>This library intercepts calls to +open/close/ioctl/mmap/mmunmap operations and redirects them to the libv4l +counterparts, by using LD_PRELOAD=/usr/lib/v4l1compat.so. It also +emulates V4L1 calls via V4L2 API.</para> + <para>It allows usage of binary legacy applications that +still don't use libv4l.</para> + </section> + +</section> diff --git a/Documentation/DocBook/media/v4l/lirc_device_interface.xml b/Documentation/DocBook/media/v4l/lirc_device_interface.xml new file mode 100644 index 00000000000..34cada2ca71 --- /dev/null +++ b/Documentation/DocBook/media/v4l/lirc_device_interface.xml @@ -0,0 +1,255 @@ +<section id="lirc_dev"> +<title>LIRC Device Interface</title> + + +<section id="lirc_dev_intro"> +<title>Introduction</title> + +<para>The LIRC device interface is a bi-directional interface for +transporting raw IR data between userspace and kernelspace. Fundamentally, +it is just a chardev (/dev/lircX, for X = 0, 1, 2, ...), with a number +of standard struct file_operations defined on it. With respect to +transporting raw IR data to and fro, the essential fops are read, write +and ioctl.</para> + +<para>Example dmesg output upon a driver registering w/LIRC:</para> + <blockquote> + <para>$ dmesg |grep lirc_dev</para> + <para>lirc_dev: IR Remote Control driver registered, major 248</para> + <para>rc rc0: lirc_dev: driver ir-lirc-codec (mceusb) registered at minor = 0</para> + </blockquote> + +<para>What you should see for a chardev:</para> + <blockquote> + <para>$ ls -l /dev/lirc*</para> + <para>crw-rw---- 1 root root 248, 0 Jul 2 22:20 /dev/lirc0</para> + </blockquote> +</section> + +<section id="lirc_read"> +<title>LIRC read fop</title> + +<para>The lircd userspace daemon reads raw IR data from the LIRC chardev. The +exact format of the data depends on what modes a driver supports, and what +mode has been selected. lircd obtains supported modes and sets the active mode +via the ioctl interface, detailed at <xref linkend="lirc_ioctl"/>. The generally +preferred mode is LIRC_MODE_MODE2, in which packets containing an int value +describing an IR signal are read from the chardev.</para> + +<para>See also <ulink url="http://www.lirc.org/html/technical.html">http://www.lirc.org/html/technical.html</ulink> for more info.</para> +</section> + +<section id="lirc_write"> +<title>LIRC write fop</title> + +<para>The data written to the chardev is a pulse/space sequence of integer +values. Pulses and spaces are only marked implicitly by their position. The +data must start and end with a pulse, therefore, the data must always include +an uneven number of samples. The write function must block until the data has +been transmitted by the hardware. If more data is provided than the hardware +can send, the driver returns EINVAL.</para> + +</section> + +<section id="lirc_ioctl"> +<title>LIRC ioctl fop</title> + +<para>The LIRC device's ioctl definition is bound by the ioctl function +definition of struct file_operations, leaving us with an unsigned int +for the ioctl command and an unsigned long for the arg. For the purposes +of ioctl portability across 32-bit and 64-bit, these values are capped +to their 32-bit sizes.</para> + +<para>The following ioctls can be used to change specific hardware settings. +In general each driver should have a default set of settings. The driver +implementation is expected to re-apply the default settings when the device +is closed by user-space, so that every application opening the device can rely +on working with the default settings initially.</para> + +<variablelist> + <varlistentry> + <term>LIRC_GET_FEATURES</term> + <listitem> + <para>Obviously, get the underlying hardware device's features. If a driver + does not announce support of certain features, calling of the corresponding + ioctls is undefined.</para> + </listitem> + </varlistentry> + <varlistentry> + <term>LIRC_GET_SEND_MODE</term> + <listitem> + <para>Get supported transmit mode. Only LIRC_MODE_PULSE is supported by lircd.</para> + </listitem> + </varlistentry> + <varlistentry> + <term>LIRC_GET_REC_MODE</term> + <listitem> + <para>Get supported receive modes. Only LIRC_MODE_MODE2 and LIRC_MODE_LIRCCODE + are supported by lircd.</para> + </listitem> + </varlistentry> + <varlistentry> + <term>LIRC_GET_SEND_CARRIER</term> + <listitem> + <para>Get carrier frequency (in Hz) currently used for transmit.</para> + </listitem> + </varlistentry> + <varlistentry> + <term>LIRC_GET_REC_CARRIER</term> + <listitem> + <para>Get carrier frequency (in Hz) currently used for IR reception.</para> + </listitem> + </varlistentry> + <varlistentry> + <term>LIRC_{G,S}ET_{SEND,REC}_DUTY_CYCLE</term> + <listitem> + <para>Get/set the duty cycle (from 0 to 100) of the carrier signal. Currently, + no special meaning is defined for 0 or 100, but this could be used to switch + off carrier generation in the future, so these values should be reserved.</para> + </listitem> + </varlistentry> + <varlistentry> + <term>LIRC_GET_REC_RESOLUTION</term> + <listitem> + <para>Some receiver have maximum resolution which is defined by internal + sample rate or data format limitations. E.g. it's common that signals can + only be reported in 50 microsecond steps. This integer value is used by + lircd to automatically adjust the aeps tolerance value in the lircd + config file.</para> + </listitem> + </varlistentry> + <varlistentry> + <term>LIRC_GET_M{IN,AX}_TIMEOUT</term> + <listitem> + <para>Some devices have internal timers that can be used to detect when + there's no IR activity for a long time. This can help lircd in detecting + that a IR signal is finished and can speed up the decoding process. + Returns an integer value with the minimum/maximum timeout that can be + set. Some devices have a fixed timeout, in that case both ioctls will + return the same value even though the timeout cannot be changed.</para> + </listitem> + </varlistentry> + <varlistentry> + <term>LIRC_GET_M{IN,AX}_FILTER_{PULSE,SPACE}</term> + <listitem> + <para>Some devices are able to filter out spikes in the incoming signal + using given filter rules. These ioctls return the hardware capabilities + that describe the bounds of the possible filters. Filter settings depend + on the IR protocols that are expected. lircd derives the settings from + all protocols definitions found in its config file.</para> + </listitem> + </varlistentry> + <varlistentry> + <term>LIRC_GET_LENGTH</term> + <listitem> + <para>Retrieves the code length in bits (only for LIRC_MODE_LIRCCODE). + Reads on the device must be done in blocks matching the bit count. + The bit could should be rounded up so that it matches full bytes.</para> + </listitem> + </varlistentry> + <varlistentry> + <term>LIRC_SET_{SEND,REC}_MODE</term> + <listitem> + <para>Set send/receive mode. Largely obsolete for send, as only + LIRC_MODE_PULSE is supported.</para> + </listitem> + </varlistentry> + <varlistentry> + <term>LIRC_SET_{SEND,REC}_CARRIER</term> + <listitem> + <para>Set send/receive carrier (in Hz).</para> + </listitem> + </varlistentry> + <varlistentry> + <term>LIRC_SET_TRANSMITTER_MASK</term> + <listitem> + <para>This enables the given set of transmitters. The first transmitter + is encoded by the least significant bit, etc. When an invalid bit mask + is given, i.e. a bit is set, even though the device does not have so many + transitters, then this ioctl returns the number of available transitters + and does nothing otherwise.</para> + </listitem> + </varlistentry> + <varlistentry> + <term>LIRC_SET_REC_TIMEOUT</term> + <listitem> + <para>Sets the integer value for IR inactivity timeout (cf. + LIRC_GET_MIN_TIMEOUT and LIRC_GET_MAX_TIMEOUT). A value of 0 (if + supported by the hardware) disables all hardware timeouts and data should + be reported as soon as possible. If the exact value cannot be set, then + the next possible value _greater_ than the given value should be set.</para> + </listitem> + </varlistentry> + <varlistentry> + <term>LIRC_SET_REC_TIMEOUT_REPORTS</term> + <listitem> + <para>Enable (1) or disable (0) timeout reports in LIRC_MODE_MODE2. By + default, timeout reports should be turned off.</para> + </listitem> + </varlistentry> + <varlistentry> + <term>LIRC_SET_REC_FILTER_{,PULSE,SPACE}</term> + <listitem> + <para>Pulses/spaces shorter than this are filtered out by hardware. If + filters cannot be set independently for pulse/space, the corresponding + ioctls must return an error and LIRC_SET_REC_FILTER shall be used instead.</para> + </listitem> + </varlistentry> + <varlistentry> + <term>LIRC_SET_MEASURE_CARRIER_MODE</term> + <listitem> + <para>Enable (1)/disable (0) measure mode. If enabled, from the next key + press on, the driver will send LIRC_MODE2_FREQUENCY packets. By default + this should be turned off.</para> + </listitem> + </varlistentry> + <varlistentry> + <term>LIRC_SET_REC_{DUTY_CYCLE,CARRIER}_RANGE</term> + <listitem> + <para>To set a range use LIRC_SET_REC_DUTY_CYCLE_RANGE/LIRC_SET_REC_CARRIER_RANGE + with the lower bound first and later LIRC_SET_REC_DUTY_CYCLE/LIRC_SET_REC_CARRIER + with the upper bound.</para> + </listitem> + </varlistentry> + <varlistentry> + <term>LIRC_NOTIFY_DECODE</term> + <listitem> + <para>This ioctl is called by lircd whenever a successful decoding of an + incoming IR signal could be done. This can be used by supporting hardware + to give visual feedback to the user e.g. by flashing a LED.</para> + </listitem> + </varlistentry> + <varlistentry> + <term>LIRC_SETUP_{START,END}</term> + <listitem> + <para>Setting of several driver parameters can be optimized by encapsulating + the according ioctl calls with LIRC_SETUP_START/LIRC_SETUP_END. When a + driver receives a LIRC_SETUP_START ioctl it can choose to not commit + further setting changes to the hardware until a LIRC_SETUP_END is received. + But this is open to the driver implementation and every driver must also + handle parameter changes which are not encapsulated by LIRC_SETUP_START + and LIRC_SETUP_END. Drivers can also choose to ignore these ioctls.</para> + </listitem> + </varlistentry> + <varlistentry> + <term>LIRC_SET_WIDEBAND_RECEIVER</term> + <listitem> + <para>Some receivers are equipped with special wide band receiver which is intended + to be used to learn output of existing remote. + Calling that ioctl with (1) will enable it, and with (0) disable it. + This might be useful of receivers that have otherwise narrow band receiver + that prevents them to be used with some remotes. + Wide band receiver might also be more precise + On the other hand its disadvantage it usually reduced range of reception. + Note: wide band receiver might be implictly enabled if you enable + carrier reports. In that case it will be disabled as soon as you disable + carrier reports. Trying to disable wide band receiver while carrier + reports are active will do nothing.</para> + </listitem> + </varlistentry> +</variablelist> +<section id="lirc_dev_errors"> + &return-value; +</section> +</section> +</section> diff --git a/Documentation/DocBook/media/v4l/media-controller.xml b/Documentation/DocBook/media/v4l/media-controller.xml new file mode 100644 index 00000000000..873ac3a621f --- /dev/null +++ b/Documentation/DocBook/media/v4l/media-controller.xml @@ -0,0 +1,89 @@ +<partinfo> + <authorgroup> + <author> + <firstname>Laurent</firstname> + <surname>Pinchart</surname> + <affiliation><address><email>laurent.pinchart@ideasonboard.com</email></address></affiliation> + <contrib>Initial version.</contrib> + </author> + </authorgroup> + <copyright> + <year>2010</year> + <holder>Laurent Pinchart</holder> + </copyright> + + <revhistory> + <!-- Put document revisions here, newest first. --> + <revision> + <revnumber>1.0.0</revnumber> + <date>2010-11-10</date> + <authorinitials>lp</authorinitials> + <revremark>Initial revision</revremark> + </revision> + </revhistory> +</partinfo> + +<title>Media Controller API</title> + +<chapter id="media_controller"> + <title>Media Controller</title> + + <section id="media-controller-intro"> + <title>Introduction</title> + <para>Media devices increasingly handle multiple related functions. Many USB + cameras include microphones, video capture hardware can also output video, + or SoC camera interfaces also perform memory-to-memory operations similar to + video codecs.</para> + <para>Independent functions, even when implemented in the same hardware, can + be modelled as separate devices. A USB camera with a microphone will be + presented to userspace applications as V4L2 and ALSA capture devices. The + devices' relationships (when using a webcam, end-users shouldn't have to + manually select the associated USB microphone), while not made available + directly to applications by the drivers, can usually be retrieved from + sysfs.</para> + <para>With more and more advanced SoC devices being introduced, the current + approach will not scale. Device topologies are getting increasingly complex + and can't always be represented by a tree structure. Hardware blocks are + shared between different functions, creating dependencies between seemingly + unrelated devices.</para> + <para>Kernel abstraction APIs such as V4L2 and ALSA provide means for + applications to access hardware parameters. As newer hardware expose an + increasingly high number of those parameters, drivers need to guess what + applications really require based on limited information, thereby + implementing policies that belong to userspace.</para> + <para>The media controller API aims at solving those problems.</para> + </section> + + <section id="media-controller-model"> + <title>Media device model</title> + <para>Discovering a device internal topology, and configuring it at runtime, + is one of the goals of the media controller API. To achieve this, hardware + devices are modelled as an oriented graph of building blocks called entities + connected through pads.</para> + <para>An entity is a basic media hardware or software building block. It can + correspond to a large variety of logical blocks such as physical hardware + devices (CMOS sensor for instance), logical hardware devices (a building + block in a System-on-Chip image processing pipeline), DMA channels or + physical connectors.</para> + <para>A pad is a connection endpoint through which an entity can interact + with other entities. Data (not restricted to video) produced by an entity + flows from the entity's output to one or more entity inputs. Pads should not + be confused with physical pins at chip boundaries.</para> + <para>A link is a point-to-point oriented connection between two pads, + either on the same entity or on different entities. Data flows from a source + pad to a sink pad.</para> + </section> +</chapter> + +<appendix id="media-user-func"> + <title>Function Reference</title> + <!-- Keep this alphabetically sorted. --> + &sub-media-func-open; + &sub-media-func-close; + &sub-media-func-ioctl; + <!-- All ioctls go here. --> + &sub-media-ioc-device-info; + &sub-media-ioc-enum-entities; + &sub-media-ioc-enum-links; + &sub-media-ioc-setup-link; +</appendix> diff --git a/Documentation/DocBook/media/v4l/media-func-close.xml b/Documentation/DocBook/media/v4l/media-func-close.xml new file mode 100644 index 00000000000..be149c802ae --- /dev/null +++ b/Documentation/DocBook/media/v4l/media-func-close.xml @@ -0,0 +1,59 @@ +<refentry id="media-func-close"> + <refmeta> + <refentrytitle>media close()</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>media-close</refname> + <refpurpose>Close a media device</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcsynopsisinfo>#include <unistd.h></funcsynopsisinfo> + <funcprototype> + <funcdef>int <function>close</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>Closes the media device. Resources associated with the file descriptor + are freed. The device configuration remain unchanged.</para> + </refsect1> + + <refsect1> + <title>Return Value</title> + + <para><function>close</function> returns 0 on success. On error, -1 is + returned, and <varname>errno</varname> is set appropriately. Possible error + codes are:</para> + + <variablelist> + <varlistentry> + <term><errorcode>EBADF</errorcode></term> + <listitem> + <para><parameter>fd</parameter> is not a valid open file descriptor. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/media-func-ioctl.xml b/Documentation/DocBook/media/v4l/media-func-ioctl.xml new file mode 100644 index 00000000000..39478d0fbca --- /dev/null +++ b/Documentation/DocBook/media/v4l/media-func-ioctl.xml @@ -0,0 +1,73 @@ +<refentry id="media-func-ioctl"> + <refmeta> + <refentrytitle>media ioctl()</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>media-ioctl</refname> + <refpurpose>Control a media device</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcsynopsisinfo>#include <sys/ioctl.h></funcsynopsisinfo> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>void *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>Media ioctl request code as defined in the media.h header file, + for example MEDIA_IOC_SETUP_LINK.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para>Pointer to a request-specific structure.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + <para>The <function>ioctl()</function> function manipulates media device + parameters. The argument <parameter>fd</parameter> must be an open file + descriptor.</para> + <para>The ioctl <parameter>request</parameter> code specifies the media + function to be called. It has encoded in it whether the argument is an + input, output or read/write parameter, and the size of the argument + <parameter>argp</parameter> in bytes.</para> + <para>Macros and structures definitions specifying media ioctl requests and + their parameters are located in the media.h header file. All media ioctl + requests, their respective function and parameters are specified in + <xref linkend="media-user-func" />.</para> + </refsect1> + + <refsect1> + &return-value; + + <para>Request-specific error codes are listed in the + individual requests descriptions.</para> + <para>When an ioctl that takes an output or read/write parameter fails, + the parameter remains unmodified.</para> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/media-func-open.xml b/Documentation/DocBook/media/v4l/media-func-open.xml new file mode 100644 index 00000000000..f7df034dc9e --- /dev/null +++ b/Documentation/DocBook/media/v4l/media-func-open.xml @@ -0,0 +1,94 @@ +<refentry id="media-func-open"> + <refmeta> + <refentrytitle>media open()</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>media-open</refname> + <refpurpose>Open a media device</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcsynopsisinfo>#include <fcntl.h></funcsynopsisinfo> + <funcprototype> + <funcdef>int <function>open</function></funcdef> + <paramdef>const char *<parameter>device_name</parameter></paramdef> + <paramdef>int <parameter>flags</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>device_name</parameter></term> + <listitem> + <para>Device to be opened.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>flags</parameter></term> + <listitem> + <para>Open flags. Access mode must be either <constant>O_RDONLY</constant> + or <constant>O_RDWR</constant>. Other flags have no effect.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + <refsect1> + <title>Description</title> + <para>To open a media device applications call <function>open()</function> + with the desired device name. The function has no side effects; the device + configuration remain unchanged.</para> + <para>When the device is opened in read-only mode, attemps to modify its + configuration will result in an error, and <varname>errno</varname> will be + set to <errorcode>EBADF</errorcode>.</para> + </refsect1> + <refsect1> + <title>Return Value</title> + + <para><function>open</function> returns the new file descriptor on success. + On error, -1 is returned, and <varname>errno</varname> is set appropriately. + Possible error codes are:</para> + + <variablelist> + <varlistentry> + <term><errorcode>EACCES</errorcode></term> + <listitem> + <para>The requested access to the file is not allowed.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EMFILE</errorcode></term> + <listitem> + <para>The process already has the maximum number of files open. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>ENFILE</errorcode></term> + <listitem> + <para>The system limit on the total number of open files has been + reached.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>ENOMEM</errorcode></term> + <listitem> + <para>Insufficient kernel memory was available.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>ENXIO</errorcode></term> + <listitem> + <para>No device corresponding to this device special file exists. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/media-ioc-device-info.xml b/Documentation/DocBook/media/v4l/media-ioc-device-info.xml new file mode 100644 index 00000000000..2ce521419e6 --- /dev/null +++ b/Documentation/DocBook/media/v4l/media-ioc-device-info.xml @@ -0,0 +1,132 @@ +<refentry id="media-ioc-device-info"> + <refmeta> + <refentrytitle>ioctl MEDIA_IOC_DEVICE_INFO</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>MEDIA_IOC_DEVICE_INFO</refname> + <refpurpose>Query device information</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct media_device_info *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>File descriptor returned by + <link linkend='media-func-open'><function>open()</function></link>.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>MEDIA_IOC_DEVICE_INFO</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>All media devices must support the <constant>MEDIA_IOC_DEVICE_INFO</constant> + ioctl. To query device information, applications call the ioctl with a + pointer to a &media-device-info;. The driver fills the structure and returns + the information to the application. + The ioctl never fails.</para> + + <table pgwide="1" frame="none" id="media-device-info"> + <title>struct <structname>media_device_info</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>char</entry> + <entry><structfield>driver</structfield>[16]</entry> + <entry><para>Name of the driver implementing the media API as a + NUL-terminated ASCII string. The driver version is stored in the + <structfield>driver_version</structfield> field.</para> + <para>Driver specific applications can use this information to + verify the driver identity. It is also useful to work around + known bugs, or to identify drivers in error reports.</para></entry> + </row> + <row> + <entry>char</entry> + <entry><structfield>model</structfield>[32]</entry> + <entry>Device model name as a NUL-terminated UTF-8 string. The + device version is stored in the <structfield>device_version</structfield> + field and is not be appended to the model name.</entry> + </row> + <row> + <entry>char</entry> + <entry><structfield>serial</structfield>[40]</entry> + <entry>Serial number as a NUL-terminated ASCII string.</entry> + </row> + <row> + <entry>char</entry> + <entry><structfield>bus_info</structfield>[32]</entry> + <entry>Location of the device in the system as a NUL-terminated + ASCII string. This includes the bus type name (PCI, USB, ...) and a + bus-specific identifier.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>media_version</structfield></entry> + <entry>Media API version, formatted with the + <constant>KERNEL_VERSION()</constant> macro.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>hw_revision</structfield></entry> + <entry>Hardware device revision in a driver-specific format.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>media_version</structfield></entry> + <entry>Media device driver version, formatted with the + <constant>KERNEL_VERSION()</constant> macro. Together with the + <structfield>driver</structfield> field this identifies a particular + driver.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[31]</entry> + <entry>Reserved for future extensions. Drivers and applications must + set this array to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + <para>The <structfield>serial</structfield> and <structfield>bus_info</structfield> + fields can be used to distinguish between multiple instances of otherwise + identical hardware. The serial number takes precedence when provided and can + be assumed to be unique. If the serial number is an empty string, the + <structfield>bus_info</structfield> field can be used instead. The + <structfield>bus_info</structfield> field is guaranteed to be unique, but + can vary across reboots or device unplug/replug.</para> + </refsect1> + + <refsect1> + &return-value; + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/media-ioc-enum-entities.xml b/Documentation/DocBook/media/v4l/media-ioc-enum-entities.xml new file mode 100644 index 00000000000..116c301656e --- /dev/null +++ b/Documentation/DocBook/media/v4l/media-ioc-enum-entities.xml @@ -0,0 +1,318 @@ +<refentry id="media-ioc-enum-entities"> + <refmeta> + <refentrytitle>ioctl MEDIA_IOC_ENUM_ENTITIES</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>MEDIA_IOC_ENUM_ENTITIES</refname> + <refpurpose>Enumerate entities and their properties</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct media_entity_desc *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>File descriptor returned by + <link linkend='media-func-open'><function>open()</function></link>.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>MEDIA_IOC_ENUM_ENTITIES</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + <para>To query the attributes of an entity, applications set the id field + of a &media-entity-desc; structure and call the MEDIA_IOC_ENUM_ENTITIES + ioctl with a pointer to this structure. The driver fills the rest of the + structure or returns an &EINVAL; when the id is invalid.</para> + <para>Entities can be enumerated by or'ing the id with the + <constant>MEDIA_ENT_ID_FLAG_NEXT</constant> flag. The driver will return + information about the entity with the smallest id strictly larger than the + requested one ('next entity'), or the &EINVAL; if there is none.</para> + <para>Entity IDs can be non-contiguous. Applications must + <emphasis>not</emphasis> try to enumerate entities by calling + MEDIA_IOC_ENUM_ENTITIES with increasing id's until they get an error.</para> + <para>Two or more entities that share a common non-zero + <structfield>group_id</structfield> value are considered as logically + grouped. Groups are used to report + <itemizedlist> + <listitem><para>ALSA, VBI and video nodes that carry the same media + stream</para></listitem> + <listitem><para>lens and flash controllers associated with a sensor</para></listitem> + </itemizedlist> + </para> + + <table pgwide="1" frame="none" id="media-entity-desc"> + <title>struct <structname>media_entity_desc</structname></title> + <tgroup cols="5"> + <colspec colname="c1" /> + <colspec colname="c2" /> + <colspec colname="c3" /> + <colspec colname="c4" /> + <colspec colname="c5" /> + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>id</structfield></entry> + <entry></entry> + <entry></entry> + <entry>Entity id, set by the application. When the id is or'ed with + <constant>MEDIA_ENT_ID_FLAG_NEXT</constant>, the driver clears the + flag and returns the first entity with a larger id.</entry> + </row> + <row> + <entry>char</entry> + <entry><structfield>name</structfield>[32]</entry> + <entry></entry> + <entry></entry> + <entry>Entity name as an UTF-8 NULL-terminated string.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>type</structfield></entry> + <entry></entry> + <entry></entry> + <entry>Entity type, see <xref linkend="media-entity-type" /> for details.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>revision</structfield></entry> + <entry></entry> + <entry></entry> + <entry>Entity revision in a driver/hardware specific format.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>flags</structfield></entry> + <entry></entry> + <entry></entry> + <entry>Entity flags, see <xref linkend="media-entity-flag" /> for details.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>group_id</structfield></entry> + <entry></entry> + <entry></entry> + <entry>Entity group ID</entry> + </row> + <row> + <entry>__u16</entry> + <entry><structfield>pads</structfield></entry> + <entry></entry> + <entry></entry> + <entry>Number of pads</entry> + </row> + <row> + <entry>__u16</entry> + <entry><structfield>links</structfield></entry> + <entry></entry> + <entry></entry> + <entry>Total number of outbound links. Inbound links are not counted + in this field.</entry> + </row> + <row> + <entry>union</entry> + </row> + <row> + <entry></entry> + <entry>struct</entry> + <entry><structfield>v4l</structfield></entry> + <entry></entry> + <entry>Valid for V4L sub-devices and nodes only.</entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry>__u32</entry> + <entry><structfield>major</structfield></entry> + <entry>V4L device node major number. For V4L sub-devices with no + device node, set by the driver to 0.</entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry>__u32</entry> + <entry><structfield>minor</structfield></entry> + <entry>V4L device node minor number. For V4L sub-devices with no + device node, set by the driver to 0.</entry> + </row> + <row> + <entry></entry> + <entry>struct</entry> + <entry><structfield>fb</structfield></entry> + <entry></entry> + <entry>Valid for frame buffer nodes only.</entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry>__u32</entry> + <entry><structfield>major</structfield></entry> + <entry>Frame buffer device node major number.</entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry>__u32</entry> + <entry><structfield>minor</structfield></entry> + <entry>Frame buffer device node minor number.</entry> + </row> + <row> + <entry></entry> + <entry>struct</entry> + <entry><structfield>alsa</structfield></entry> + <entry></entry> + <entry>Valid for ALSA devices only.</entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry>__u32</entry> + <entry><structfield>card</structfield></entry> + <entry>ALSA card number</entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry>__u32</entry> + <entry><structfield>device</structfield></entry> + <entry>ALSA device number</entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry>__u32</entry> + <entry><structfield>subdevice</structfield></entry> + <entry>ALSA sub-device number</entry> + </row> + <row> + <entry></entry> + <entry>int</entry> + <entry><structfield>dvb</structfield></entry> + <entry></entry> + <entry>DVB card number</entry> + </row> + <row> + <entry></entry> + <entry>__u8</entry> + <entry><structfield>raw</structfield>[180]</entry> + <entry></entry> + <entry></entry> + </row> + </tbody> + </tgroup> + </table> + + <table frame="none" pgwide="1" id="media-entity-type"> + <title>Media entity types</title> + <tgroup cols="2"> + <colspec colname="c1"/> + <colspec colname="c2"/> + <tbody valign="top"> + <row> + <entry><constant>MEDIA_ENT_T_DEVNODE</constant></entry> + <entry>Unknown device node</entry> + </row> + <row> + <entry><constant>MEDIA_ENT_T_DEVNODE_V4L</constant></entry> + <entry>V4L video, radio or vbi device node</entry> + </row> + <row> + <entry><constant>MEDIA_ENT_T_DEVNODE_FB</constant></entry> + <entry>Frame buffer device node</entry> + </row> + <row> + <entry><constant>MEDIA_ENT_T_DEVNODE_ALSA</constant></entry> + <entry>ALSA card</entry> + </row> + <row> + <entry><constant>MEDIA_ENT_T_DEVNODE_DVB</constant></entry> + <entry>DVB card</entry> + </row> + <row> + <entry><constant>MEDIA_ENT_T_V4L2_SUBDEV</constant></entry> + <entry>Unknown V4L sub-device</entry> + </row> + <row> + <entry><constant>MEDIA_ENT_T_V4L2_SUBDEV_SENSOR</constant></entry> + <entry>Video sensor</entry> + </row> + <row> + <entry><constant>MEDIA_ENT_T_V4L2_SUBDEV_FLASH</constant></entry> + <entry>Flash controller</entry> + </row> + <row> + <entry><constant>MEDIA_ENT_T_V4L2_SUBDEV_LENS</constant></entry> + <entry>Lens controller</entry> + </row> + <row> + <entry><constant>MEDIA_ENT_T_V4L2_SUBDEV_DECODER</constant></entry> + <entry>Video decoder, the basic function of the video decoder is to + accept analogue video from a wide variety of sources such as + broadcast, DVD players, cameras and video cassette recorders, in + either NTSC, PAL or HD format and still occasionally SECAM, separate + it into its component parts, luminance and chrominance, and output + it in some digital video standard, with appropriate embedded timing + signals.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table frame="none" pgwide="1" id="media-entity-flag"> + <title>Media entity flags</title> + <tgroup cols="2"> + <colspec colname="c1"/> + <colspec colname="c2"/> + <tbody valign="top"> + <row> + <entry><constant>MEDIA_ENT_FL_DEFAULT</constant></entry> + <entry>Default entity for its type. Used to discover the default + audio, VBI and video devices, the default camera sensor, ...</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The &media-entity-desc; <structfield>id</structfield> references + a non-existing entity.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/media-ioc-enum-links.xml b/Documentation/DocBook/media/v4l/media-ioc-enum-links.xml new file mode 100644 index 00000000000..74fb394ec66 --- /dev/null +++ b/Documentation/DocBook/media/v4l/media-ioc-enum-links.xml @@ -0,0 +1,216 @@ +<refentry id="media-ioc-enum-links"> + <refmeta> + <refentrytitle>ioctl MEDIA_IOC_ENUM_LINKS</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>MEDIA_IOC_ENUM_LINKS</refname> + <refpurpose>Enumerate all pads and links for a given entity</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct media_links_enum *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>File descriptor returned by + <link linkend='media-func-open'><function>open()</function></link>.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>MEDIA_IOC_ENUM_LINKS</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>To enumerate pads and/or links for a given entity, applications set + the entity field of a &media-links-enum; structure and initialize the + &media-pad-desc; and &media-link-desc; structure arrays pointed by the + <structfield>pads</structfield> and <structfield>links</structfield> fields. + They then call the MEDIA_IOC_ENUM_LINKS ioctl with a pointer to this + structure.</para> + <para>If the <structfield>pads</structfield> field is not NULL, the driver + fills the <structfield>pads</structfield> array with information about the + entity's pads. The array must have enough room to store all the entity's + pads. The number of pads can be retrieved with the &MEDIA-IOC-ENUM-ENTITIES; + ioctl.</para> + <para>If the <structfield>links</structfield> field is not NULL, the driver + fills the <structfield>links</structfield> array with information about the + entity's outbound links. The array must have enough room to store all the + entity's outbound links. The number of outbound links can be retrieved with + the &MEDIA-IOC-ENUM-ENTITIES; ioctl.</para> + <para>Only forward links that originate at one of the entity's source pads + are returned during the enumeration process.</para> + + <table pgwide="1" frame="none" id="media-links-enum"> + <title>struct <structname>media_links_enum</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>entity</structfield></entry> + <entry>Entity id, set by the application.</entry> + </row> + <row> + <entry>&media-pad-desc;</entry> + <entry>*<structfield>pads</structfield></entry> + <entry>Pointer to a pads array allocated by the application. Ignored + if NULL.</entry> + </row> + <row> + <entry>&media-link-desc;</entry> + <entry>*<structfield>links</structfield></entry> + <entry>Pointer to a links array allocated by the application. Ignored + if NULL.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="media-pad-desc"> + <title>struct <structname>media_pad_desc</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>entity</structfield></entry> + <entry>ID of the entity this pad belongs to.</entry> + </row> + <row> + <entry>__u16</entry> + <entry><structfield>index</structfield></entry> + <entry>0-based pad index.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>flags</structfield></entry> + <entry>Pad flags, see <xref linkend="media-pad-flag" /> for more details.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table frame="none" pgwide="1" id="media-pad-flag"> + <title>Media pad flags</title> + <tgroup cols="2"> + <colspec colname="c1"/> + <colspec colname="c2"/> + <tbody valign="top"> + <row> + <entry><constant>MEDIA_PAD_FL_SINK</constant></entry> + <entry>Input pad, relative to the entity. Input pads sink data and + are targets of links.</entry> + </row> + <row> + <entry><constant>MEDIA_PAD_FL_SOURCE</constant></entry> + <entry>Output pad, relative to the entity. Output pads source data + and are origins of links.</entry> + </row> + <row> + <entry><constant>MEDIA_PAD_FL_MUST_CONNECT</constant></entry> + <entry>If this flag is set and the pad is linked to any other + pad, then at least one of those links must be enabled for the + entity to be able to stream. There could be temporary reasons + (e.g. device configuration dependent) for the pad to need + enabled links even when this flag isn't set; the absence of the + flag doesn't imply there is none.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="media-link-desc"> + <title>struct <structname>media_link_desc</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>&media-pad-desc;</entry> + <entry><structfield>source</structfield></entry> + <entry>Pad at the origin of this link.</entry> + </row> + <row> + <entry>&media-pad-desc;</entry> + <entry><structfield>sink</structfield></entry> + <entry>Pad at the target of this link.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>flags</structfield></entry> + <entry>Link flags, see <xref linkend="media-link-flag" /> for more details.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table frame="none" pgwide="1" id="media-link-flag"> + <title>Media link flags</title> + <tgroup cols="2"> + <colspec colname="c1"/> + <colspec colname="c2"/> + <tbody valign="top"> + <row> + <entry><constant>MEDIA_LNK_FL_ENABLED</constant></entry> + <entry>The link is enabled and can be used to transfer media data. + When two or more links target a sink pad, only one of them can be + enabled at a time.</entry> + </row> + <row> + <entry><constant>MEDIA_LNK_FL_IMMUTABLE</constant></entry> + <entry>The link enabled state can't be modified at runtime. An + immutable link is always enabled.</entry> + </row> + <row> + <entry><constant>MEDIA_LNK_FL_DYNAMIC</constant></entry> + <entry>The link enabled state can be modified during streaming. This + flag is set by drivers and is read-only for applications.</entry> + </row> + </tbody> + </tgroup> + </table> + <para>One and only one of <constant>MEDIA_PAD_FL_SINK</constant> and + <constant>MEDIA_PAD_FL_SOURCE</constant> must be set for every pad.</para> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The &media-links-enum; <structfield>id</structfield> references + a non-existing entity.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/media-ioc-setup-link.xml b/Documentation/DocBook/media/v4l/media-ioc-setup-link.xml new file mode 100644 index 00000000000..fc2e522ee65 --- /dev/null +++ b/Documentation/DocBook/media/v4l/media-ioc-setup-link.xml @@ -0,0 +1,84 @@ +<refentry id="media-ioc-setup-link"> + <refmeta> + <refentrytitle>ioctl MEDIA_IOC_SETUP_LINK</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>MEDIA_IOC_SETUP_LINK</refname> + <refpurpose>Modify the properties of a link</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct media_link_desc *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>File descriptor returned by + <link linkend='media-func-open'><function>open()</function></link>.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>MEDIA_IOC_SETUP_LINK</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>To change link properties applications fill a &media-link-desc; with + link identification information (source and sink pad) and the new requested + link flags. They then call the MEDIA_IOC_SETUP_LINK ioctl with a pointer to + that structure.</para> + <para>The only configurable property is the <constant>ENABLED</constant> + link flag to enable/disable a link. Links marked with the + <constant>IMMUTABLE</constant> link flag can not be enabled or disabled. + </para> + <para>Link configuration has no side effect on other links. If an enabled + link at the sink pad prevents the link from being enabled, the driver + returns with an &EBUSY;.</para> + <para>Only links marked with the <constant>DYNAMIC</constant> link flag can + be enabled/disabled while streaming media data. Attempting to enable or + disable a streaming non-dynamic link will return an &EBUSY;.</para> + <para>If the specified link can't be found the driver returns with an + &EINVAL;.</para> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The &media-link-desc; references a non-existing link, or the + link is immutable and an attempt to modify its configuration was made. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/pipeline.pdf b/Documentation/DocBook/media/v4l/pipeline.pdf Binary files differnew file mode 100644 index 00000000000..ee3e37f04b6 --- /dev/null +++ b/Documentation/DocBook/media/v4l/pipeline.pdf diff --git a/Documentation/DocBook/media/v4l/pixfmt-grey.xml b/Documentation/DocBook/media/v4l/pixfmt-grey.xml new file mode 100644 index 00000000000..bee970d3f76 --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-grey.xml @@ -0,0 +1,62 @@ + <refentry id="V4L2-PIX-FMT-GREY"> + <refmeta> + <refentrytitle>V4L2_PIX_FMT_GREY ('GREY')</refentrytitle> + &manvol; + </refmeta> + <refnamediv> + <refname><constant>V4L2_PIX_FMT_GREY</constant></refname> + <refpurpose>Grey-scale image</refpurpose> + </refnamediv> + <refsect1> + <title>Description</title> + + <para>This is a grey-scale image. It is really a degenerate +Y'CbCr format which simply contains no Cb or Cr data.</para> + + <example> + <title><constant>V4L2_PIX_FMT_GREY</constant> 4 × 4 +pixel image</title> + + <formalpara> + <title>Byte Order.</title> + <para>Each cell is one byte. + <informaltable frame="none"> + <tgroup cols="5" align="center"> + <colspec align="left" colwidth="2*" /> + <tbody valign="top"> + <row> + <entry>start + 0:</entry> + <entry>Y'<subscript>00</subscript></entry> + <entry>Y'<subscript>01</subscript></entry> + <entry>Y'<subscript>02</subscript></entry> + <entry>Y'<subscript>03</subscript></entry> + </row> + <row> + <entry>start + 4:</entry> + <entry>Y'<subscript>10</subscript></entry> + <entry>Y'<subscript>11</subscript></entry> + <entry>Y'<subscript>12</subscript></entry> + <entry>Y'<subscript>13</subscript></entry> + </row> + <row> + <entry>start + 8:</entry> + <entry>Y'<subscript>20</subscript></entry> + <entry>Y'<subscript>21</subscript></entry> + <entry>Y'<subscript>22</subscript></entry> + <entry>Y'<subscript>23</subscript></entry> + </row> + <row> + <entry>start + 12:</entry> + <entry>Y'<subscript>30</subscript></entry> + <entry>Y'<subscript>31</subscript></entry> + <entry>Y'<subscript>32</subscript></entry> + <entry>Y'<subscript>33</subscript></entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + </example> + </refsect1> + </refentry> diff --git a/Documentation/DocBook/media/v4l/pixfmt-m420.xml b/Documentation/DocBook/media/v4l/pixfmt-m420.xml new file mode 100644 index 00000000000..aadae92c5d0 --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-m420.xml @@ -0,0 +1,139 @@ + <refentry id="V4L2-PIX-FMT-M420"> + <refmeta> + <refentrytitle>V4L2_PIX_FMT_M420 ('M420')</refentrytitle> + &manvol; + </refmeta> + <refnamediv> + <refname><constant>V4L2_PIX_FMT_M420</constant></refname> + <refpurpose>Format with ½ horizontal and vertical chroma + resolution, also known as YUV 4:2:0. Hybrid plane line-interleaved + layout.</refpurpose> + </refnamediv> + <refsect1> + <title>Description</title> + + <para>M420 is a YUV format with ½ horizontal and vertical chroma + subsampling (YUV 4:2:0). Pixels are organized as interleaved luma and + chroma planes. Two lines of luma data are followed by one line of chroma + data.</para> + <para>The luma plane has one byte per pixel. The chroma plane contains + interleaved CbCr pixels subsampled by ½ in the horizontal and + vertical directions. Each CbCr pair belongs to four pixels. For example, +Cb<subscript>0</subscript>/Cr<subscript>0</subscript> belongs to +Y'<subscript>00</subscript>, Y'<subscript>01</subscript>, +Y'<subscript>10</subscript>, Y'<subscript>11</subscript>.</para> + + <para>All line lengths are identical: if the Y lines include pad bytes + so do the CbCr lines.</para> + + <example> + <title><constant>V4L2_PIX_FMT_M420</constant> 4 × 4 +pixel image</title> + + <formalpara> + <title>Byte Order.</title> + <para>Each cell is one byte. + <informaltable frame="none"> + <tgroup cols="5" align="center"> + <colspec align="left" colwidth="2*" /> + <tbody valign="top"> + <row> + <entry>start + 0:</entry> + <entry>Y'<subscript>00</subscript></entry> + <entry>Y'<subscript>01</subscript></entry> + <entry>Y'<subscript>02</subscript></entry> + <entry>Y'<subscript>03</subscript></entry> + </row> + <row> + <entry>start + 4:</entry> + <entry>Y'<subscript>10</subscript></entry> + <entry>Y'<subscript>11</subscript></entry> + <entry>Y'<subscript>12</subscript></entry> + <entry>Y'<subscript>13</subscript></entry> + </row> + <row> + <entry>start + 8:</entry> + <entry>Cb<subscript>00</subscript></entry> + <entry>Cr<subscript>00</subscript></entry> + <entry>Cb<subscript>01</subscript></entry> + <entry>Cr<subscript>01</subscript></entry> + </row> + <row> + <entry>start + 16:</entry> + <entry>Y'<subscript>20</subscript></entry> + <entry>Y'<subscript>21</subscript></entry> + <entry>Y'<subscript>22</subscript></entry> + <entry>Y'<subscript>23</subscript></entry> + </row> + <row> + <entry>start + 20:</entry> + <entry>Y'<subscript>30</subscript></entry> + <entry>Y'<subscript>31</subscript></entry> + <entry>Y'<subscript>32</subscript></entry> + <entry>Y'<subscript>33</subscript></entry> + </row> + <row> + <entry>start + 24:</entry> + <entry>Cb<subscript>10</subscript></entry> + <entry>Cr<subscript>10</subscript></entry> + <entry>Cb<subscript>11</subscript></entry> + <entry>Cr<subscript>11</subscript></entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + + <formalpara> + <title>Color Sample Location.</title> + <para> + <informaltable frame="none"> + <tgroup cols="7" align="center"> + <tbody valign="top"> + <row> + <entry></entry> + <entry>0</entry><entry></entry><entry>1</entry><entry></entry> + <entry>2</entry><entry></entry><entry>3</entry> + </row> + <row> + <entry>0</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + <row> + <entry></entry> + <entry></entry><entry>C</entry><entry></entry><entry></entry> + <entry></entry><entry>C</entry><entry></entry> + </row> + <row> + <entry>1</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + <row> + <entry></entry> + </row> + <row> + <entry>2</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + <row> + <entry></entry> + <entry></entry><entry>C</entry><entry></entry><entry></entry> + <entry></entry><entry>C</entry><entry></entry> + </row> + <row> + <entry>3</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + </example> + </refsect1> + </refentry> diff --git a/Documentation/DocBook/media/v4l/pixfmt-nv12.xml b/Documentation/DocBook/media/v4l/pixfmt-nv12.xml new file mode 100644 index 00000000000..84dd4fd7cb8 --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-nv12.xml @@ -0,0 +1,143 @@ + <refentry> + <refmeta> + <refentrytitle>V4L2_PIX_FMT_NV12 ('NV12'), V4L2_PIX_FMT_NV21 ('NV21')</refentrytitle> + &manvol; + </refmeta> + <refnamediv> + <refname id="V4L2-PIX-FMT-NV12"><constant>V4L2_PIX_FMT_NV12</constant></refname> + <refname id="V4L2-PIX-FMT-NV21"><constant>V4L2_PIX_FMT_NV21</constant></refname> + <refpurpose>Formats with ½ horizontal and vertical +chroma resolution, also known as YUV 4:2:0. One luminance and one +chrominance plane with alternating chroma samples as opposed to +<constant>V4L2_PIX_FMT_YVU420</constant></refpurpose> + </refnamediv> + <refsect1> + <title>Description</title> + + <para>These are two-plane versions of the YUV 4:2:0 format. +The three components are separated into two sub-images or planes. The +Y plane is first. The Y plane has one byte per pixel. For +<constant>V4L2_PIX_FMT_NV12</constant>, a combined CbCr plane +immediately follows the Y plane in memory. The CbCr plane is the same +width, in bytes, as the Y plane (and of the image), but is half as +tall in pixels. Each CbCr pair belongs to four pixels. For example, +Cb<subscript>0</subscript>/Cr<subscript>0</subscript> belongs to +Y'<subscript>00</subscript>, Y'<subscript>01</subscript>, +Y'<subscript>10</subscript>, Y'<subscript>11</subscript>. +<constant>V4L2_PIX_FMT_NV21</constant> is the same except the Cb and +Cr bytes are swapped, the CrCb plane starts with a Cr byte.</para> + + <para>If the Y plane has pad bytes after each row, then the +CbCr plane has as many pad bytes after its rows.</para> + + <example> + <title><constant>V4L2_PIX_FMT_NV12</constant> 4 × 4 +pixel image</title> + + <formalpara> + <title>Byte Order.</title> + <para>Each cell is one byte. + <informaltable frame="none"> + <tgroup cols="5" align="center"> + <colspec align="left" colwidth="2*" /> + <tbody valign="top"> + <row> + <entry>start + 0:</entry> + <entry>Y'<subscript>00</subscript></entry> + <entry>Y'<subscript>01</subscript></entry> + <entry>Y'<subscript>02</subscript></entry> + <entry>Y'<subscript>03</subscript></entry> + </row> + <row> + <entry>start + 4:</entry> + <entry>Y'<subscript>10</subscript></entry> + <entry>Y'<subscript>11</subscript></entry> + <entry>Y'<subscript>12</subscript></entry> + <entry>Y'<subscript>13</subscript></entry> + </row> + <row> + <entry>start + 8:</entry> + <entry>Y'<subscript>20</subscript></entry> + <entry>Y'<subscript>21</subscript></entry> + <entry>Y'<subscript>22</subscript></entry> + <entry>Y'<subscript>23</subscript></entry> + </row> + <row> + <entry>start + 12:</entry> + <entry>Y'<subscript>30</subscript></entry> + <entry>Y'<subscript>31</subscript></entry> + <entry>Y'<subscript>32</subscript></entry> + <entry>Y'<subscript>33</subscript></entry> + </row> + <row> + <entry>start + 16:</entry> + <entry>Cb<subscript>00</subscript></entry> + <entry>Cr<subscript>00</subscript></entry> + <entry>Cb<subscript>01</subscript></entry> + <entry>Cr<subscript>01</subscript></entry> + </row> + <row> + <entry>start + 20:</entry> + <entry>Cb<subscript>10</subscript></entry> + <entry>Cr<subscript>10</subscript></entry> + <entry>Cb<subscript>11</subscript></entry> + <entry>Cr<subscript>11</subscript></entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + + <formalpara> + <title>Color Sample Location.</title> + <para> + <informaltable frame="none"> + <tgroup cols="7" align="center"> + <tbody valign="top"> + <row> + <entry></entry> + <entry>0</entry><entry></entry><entry>1</entry><entry></entry> + <entry>2</entry><entry></entry><entry>3</entry> + </row> + <row> + <entry>0</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + <row> + <entry></entry> + <entry></entry><entry>C</entry><entry></entry><entry></entry> + <entry></entry><entry>C</entry><entry></entry> + </row> + <row> + <entry>1</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + <row> + <entry></entry> + </row> + <row> + <entry>2</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + <row> + <entry></entry> + <entry></entry><entry>C</entry><entry></entry><entry></entry> + <entry></entry><entry>C</entry><entry></entry> + </row> + <row> + <entry>3</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + </example> + </refsect1> + </refentry> diff --git a/Documentation/DocBook/media/v4l/pixfmt-nv12m.xml b/Documentation/DocBook/media/v4l/pixfmt-nv12m.xml new file mode 100644 index 00000000000..f3a3d459fcd --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-nv12m.xml @@ -0,0 +1,153 @@ + <refentry> + <refmeta> + <refentrytitle>V4L2_PIX_FMT_NV12M ('NM12'), V4L2_PIX_FMT_NV21M ('NM21'), V4L2_PIX_FMT_NV12MT_16X16</refentrytitle> + &manvol; + </refmeta> + <refnamediv> + <refname id="V4L2-PIX-FMT-NV12M"><constant>V4L2_PIX_FMT_NV12M</constant></refname> + <refname id="V4L2-PIX-FMT-NV21M"><constant>V4L2_PIX_FMT_NV21M</constant></refname> + <refname id="V4L2-PIX-FMT-NV12MT-16X16"><constant>V4L2_PIX_FMT_NV12MT_16X16</constant></refname> + <refpurpose>Variation of <constant>V4L2_PIX_FMT_NV12</constant> and <constant>V4L2_PIX_FMT_NV21</constant> with planes + non contiguous in memory. </refpurpose> + </refnamediv> + <refsect1> + <title>Description</title> + + <para>This is a multi-planar, two-plane version of the YUV 4:2:0 format. +The three components are separated into two sub-images or planes. +<constant>V4L2_PIX_FMT_NV12M</constant> differs from <constant>V4L2_PIX_FMT_NV12 +</constant> in that the two planes are non-contiguous in memory, i.e. the chroma +plane do not necessarily immediately follows the luma plane. +The luminance data occupies the first plane. The Y plane has one byte per pixel. +In the second plane there is a chrominance data with alternating chroma samples. +The CbCr plane is the same width, in bytes, as the Y plane (and of the image), +but is half as tall in pixels. Each CbCr pair belongs to four pixels. For example, +Cb<subscript>0</subscript>/Cr<subscript>0</subscript> belongs to +Y'<subscript>00</subscript>, Y'<subscript>01</subscript>, +Y'<subscript>10</subscript>, Y'<subscript>11</subscript>. +<constant>V4L2_PIX_FMT_NV12MT_16X16</constant> is the tiled version of +<constant>V4L2_PIX_FMT_NV12M</constant> with 16x16 macroblock tiles. Here pixels +are arranged in 16x16 2D tiles and tiles are arranged in linear order in memory. +<constant>V4L2_PIX_FMT_NV21M</constant> is the same as <constant>V4L2_PIX_FMT_NV12M</constant> +except the Cb and Cr bytes are swapped, the CrCb plane starts with a Cr byte.</para> + + <para><constant>V4L2_PIX_FMT_NV12M</constant> is intended to be +used only in drivers and applications that support the multi-planar API, +described in <xref linkend="planar-apis"/>. </para> + + <para>If the Y plane has pad bytes after each row, then the +CbCr plane has as many pad bytes after its rows.</para> + + <example> + <title><constant>V4L2_PIX_FMT_NV12M</constant> 4 × 4 pixel image</title> + + <formalpara> + <title>Byte Order.</title> + <para>Each cell is one byte. + <informaltable frame="none"> + <tgroup cols="5" align="center"> + <colspec align="left" colwidth="2*" /> + <tbody valign="top"> + <row> + <entry>start0 + 0:</entry> + <entry>Y'<subscript>00</subscript></entry> + <entry>Y'<subscript>01</subscript></entry> + <entry>Y'<subscript>02</subscript></entry> + <entry>Y'<subscript>03</subscript></entry> + </row> + <row> + <entry>start0 + 4:</entry> + <entry>Y'<subscript>10</subscript></entry> + <entry>Y'<subscript>11</subscript></entry> + <entry>Y'<subscript>12</subscript></entry> + <entry>Y'<subscript>13</subscript></entry> + </row> + <row> + <entry>start0 + 8:</entry> + <entry>Y'<subscript>20</subscript></entry> + <entry>Y'<subscript>21</subscript></entry> + <entry>Y'<subscript>22</subscript></entry> + <entry>Y'<subscript>23</subscript></entry> + </row> + <row> + <entry>start0 + 12:</entry> + <entry>Y'<subscript>30</subscript></entry> + <entry>Y'<subscript>31</subscript></entry> + <entry>Y'<subscript>32</subscript></entry> + <entry>Y'<subscript>33</subscript></entry> + </row> + <row> + <entry></entry> + </row> + <row> + <entry>start1 + 0:</entry> + <entry>Cb<subscript>00</subscript></entry> + <entry>Cr<subscript>00</subscript></entry> + <entry>Cb<subscript>01</subscript></entry> + <entry>Cr<subscript>01</subscript></entry> + </row> + <row> + <entry>start1 + 4:</entry> + <entry>Cb<subscript>10</subscript></entry> + <entry>Cr<subscript>10</subscript></entry> + <entry>Cb<subscript>11</subscript></entry> + <entry>Cr<subscript>11</subscript></entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + + <formalpara> + <title>Color Sample Location.</title> + <para> + <informaltable frame="none"> + <tgroup cols="7" align="center"> + <tbody valign="top"> + <row> + <entry></entry> + <entry>0</entry><entry></entry><entry>1</entry><entry></entry> + <entry>2</entry><entry></entry><entry>3</entry> + </row> + <row> + <entry>0</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + <row> + <entry></entry> + <entry></entry><entry>C</entry><entry></entry><entry></entry> + <entry></entry><entry>C</entry><entry></entry> + </row> + <row> + <entry>1</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + <row> + <entry></entry> + </row> + <row> + <entry>2</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + <row> + <entry></entry> + <entry></entry><entry>C</entry><entry></entry><entry></entry> + <entry></entry><entry>C</entry><entry></entry> + </row> + <row> + <entry>3</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + </example> + </refsect1> + </refentry> diff --git a/Documentation/DocBook/media/v4l/pixfmt-nv12mt.xml b/Documentation/DocBook/media/v4l/pixfmt-nv12mt.xml new file mode 100644 index 00000000000..8a70a1707b7 --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-nv12mt.xml @@ -0,0 +1,66 @@ + <refentry> + <refmeta> + <refentrytitle>V4L2_PIX_FMT_NV12MT ('TM12')</refentrytitle> + &manvol; + </refmeta> + <refnamediv> + <refname id="V4L2-PIX-FMT-NV12MT"><constant>V4L2_PIX_FMT_NV12MT +</constant></refname> + <refpurpose>Formats with ½ horizontal and vertical +chroma resolution. This format has two planes - one for luminance and one for +chrominance. Chroma samples are interleaved. The difference to +<constant>V4L2_PIX_FMT_NV12</constant> is the memory layout. Pixels are +grouped in macroblocks of 64x32 size. The order of macroblocks in memory is +also not standard. + </refpurpose> + </refnamediv> + <refsect1> + <title>Description</title> + + <para>This is the two-plane versions of the YUV 4:2:0 format where data +is grouped into 64x32 macroblocks. The three components are separated into two +sub-images or planes. The Y plane has one byte per pixel and pixels are grouped +into 64x32 macroblocks. The CbCr plane has the same width, in bytes, as the Y +plane (and the image), but is half as tall in pixels. The chroma plane is also +grouped into 64x32 macroblocks.</para> + <para>Width of the buffer has to be aligned to the multiple of 128, and +height alignment is 32. Every four adjacent buffers - two horizontally and two +vertically are grouped together and are located in memory in Z or flipped Z +order. </para> + <para>Layout of macroblocks in memory is presented in the following +figure.</para> + <para><figure id="nv12mt"> + <title><constant>V4L2_PIX_FMT_NV12MT</constant> macroblock Z shape +memory layout</title> + <mediaobject> + <imageobject> + <imagedata fileref="nv12mt.gif" format="GIF" /> + </imageobject> + </mediaobject> + </figure> + The requirement that width is multiple of 128 is implemented because, +the Z shape cannot be cut in half horizontally. In case the vertical resolution +of macroblocks is odd then the last row of macroblocks is arranged in a linear +order. </para> + <para>In case of chroma the layout is identical. Cb and Cr samples are +interleaved. Height of the buffer is aligned to 32. + </para> + <example> + <title>Memory layout of macroblocks in <constant>V4L2_PIX_FMT_NV12 +</constant> format pixel image - extreme case</title> + <para> + <figure id="nv12mt_ex"> + <title>Example <constant>V4L2_PIX_FMT_NV12MT</constant> memory +layout of macroblocks</title> + <mediaobject> + <imageobject> + <imagedata fileref="nv12mt_example.gif" format="GIF" /> + </imageobject> + </mediaobject> + </figure> + Memory layout of macroblocks of <constant>V4L2_PIX_FMT_NV12MT +</constant> format in most extreme case. + </para> + </example> + </refsect1> + </refentry> diff --git a/Documentation/DocBook/media/v4l/pixfmt-nv16.xml b/Documentation/DocBook/media/v4l/pixfmt-nv16.xml new file mode 100644 index 00000000000..8ae1f8a810d --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-nv16.xml @@ -0,0 +1,166 @@ + <refentry> + <refmeta> + <refentrytitle>V4L2_PIX_FMT_NV16 ('NV16'), V4L2_PIX_FMT_NV61 ('NV61')</refentrytitle> + &manvol; + </refmeta> + <refnamediv> + <refname id="V4L2-PIX-FMT-NV16"><constant>V4L2_PIX_FMT_NV16</constant></refname> + <refname id="V4L2-PIX-FMT-NV61"><constant>V4L2_PIX_FMT_NV61</constant></refname> + <refpurpose>Formats with ½ horizontal +chroma resolution, also known as YUV 4:2:2. One luminance and one +chrominance plane with alternating chroma samples as opposed to +<constant>V4L2_PIX_FMT_YVU420</constant></refpurpose> + </refnamediv> + <refsect1> + <title>Description</title> + + <para>These are two-plane versions of the YUV 4:2:2 format. +The three components are separated into two sub-images or planes. The +Y plane is first. The Y plane has one byte per pixel. For +<constant>V4L2_PIX_FMT_NV16</constant>, a combined CbCr plane +immediately follows the Y plane in memory. The CbCr plane is the same +width and height, in bytes, as the Y plane (and of the image). +Each CbCr pair belongs to two pixels. For example, +Cb<subscript>0</subscript>/Cr<subscript>0</subscript> belongs to +Y'<subscript>00</subscript>, Y'<subscript>01</subscript>. +<constant>V4L2_PIX_FMT_NV61</constant> is the same except the Cb and +Cr bytes are swapped, the CrCb plane starts with a Cr byte.</para> + + <para>If the Y plane has pad bytes after each row, then the +CbCr plane has as many pad bytes after its rows.</para> + + <example> + <title><constant>V4L2_PIX_FMT_NV16</constant> 4 × 4 +pixel image</title> + + <formalpara> + <title>Byte Order.</title> + <para>Each cell is one byte. + <informaltable frame="none"> + <tgroup cols="5" align="center"> + <colspec align="left" colwidth="2*" /> + <tbody valign="top"> + <row> + <entry>start + 0:</entry> + <entry>Y'<subscript>00</subscript></entry> + <entry>Y'<subscript>01</subscript></entry> + <entry>Y'<subscript>02</subscript></entry> + <entry>Y'<subscript>03</subscript></entry> + </row> + <row> + <entry>start + 4:</entry> + <entry>Y'<subscript>10</subscript></entry> + <entry>Y'<subscript>11</subscript></entry> + <entry>Y'<subscript>12</subscript></entry> + <entry>Y'<subscript>13</subscript></entry> + </row> + <row> + <entry>start + 8:</entry> + <entry>Y'<subscript>20</subscript></entry> + <entry>Y'<subscript>21</subscript></entry> + <entry>Y'<subscript>22</subscript></entry> + <entry>Y'<subscript>23</subscript></entry> + </row> + <row> + <entry>start + 12:</entry> + <entry>Y'<subscript>30</subscript></entry> + <entry>Y'<subscript>31</subscript></entry> + <entry>Y'<subscript>32</subscript></entry> + <entry>Y'<subscript>33</subscript></entry> + </row> + <row> + <entry>start + 16:</entry> + <entry>Cb<subscript>00</subscript></entry> + <entry>Cr<subscript>00</subscript></entry> + <entry>Cb<subscript>01</subscript></entry> + <entry>Cr<subscript>01</subscript></entry> + </row> + <row> + <entry>start + 20:</entry> + <entry>Cb<subscript>10</subscript></entry> + <entry>Cr<subscript>10</subscript></entry> + <entry>Cb<subscript>11</subscript></entry> + <entry>Cr<subscript>11</subscript></entry> + </row> + <row> + <entry>start + 24:</entry> + <entry>Cb<subscript>20</subscript></entry> + <entry>Cr<subscript>20</subscript></entry> + <entry>Cb<subscript>21</subscript></entry> + <entry>Cr<subscript>21</subscript></entry> + </row> + <row> + <entry>start + 28:</entry> + <entry>Cb<subscript>30</subscript></entry> + <entry>Cr<subscript>30</subscript></entry> + <entry>Cb<subscript>31</subscript></entry> + <entry>Cr<subscript>31</subscript></entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + + <formalpara> + <title>Color Sample Location.</title> + <para> + <informaltable frame="none"> + <tgroup cols="7" align="center"> + <tbody valign="top"> + <row> + <entry></entry> + <entry>0</entry><entry></entry><entry>1</entry><entry></entry> + <entry>2</entry><entry></entry><entry>3</entry> + </row> + <row> + <entry>0</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + <row> + <entry></entry> + <entry></entry><entry>C</entry><entry></entry><entry></entry> + <entry></entry><entry>C</entry><entry></entry> + </row> + <row> + <entry>1</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + <row> + <entry></entry> + <entry></entry><entry>C</entry><entry></entry><entry></entry> + <entry></entry><entry>C</entry><entry></entry> + </row> + <row> + <entry></entry> + </row> + <row> + <entry>2</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + <row> + <entry></entry> + <entry></entry><entry>C</entry><entry></entry><entry></entry> + <entry></entry><entry>C</entry><entry></entry> + </row> + <row> + <entry>3</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + <row> + <entry></entry> + <entry></entry><entry>C</entry><entry></entry><entry></entry> + <entry></entry><entry>C</entry><entry></entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + </example> + </refsect1> + </refentry> diff --git a/Documentation/DocBook/media/v4l/pixfmt-nv16m.xml b/Documentation/DocBook/media/v4l/pixfmt-nv16m.xml new file mode 100644 index 00000000000..fb2b5e35d66 --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-nv16m.xml @@ -0,0 +1,170 @@ + <refentry> + <refmeta> + <refentrytitle>V4L2_PIX_FMT_NV16M ('NM16'), V4L2_PIX_FMT_NV61M ('NM61')</refentrytitle> + &manvol; + </refmeta> + <refnamediv> + <refname id="V4L2-PIX-FMT-NV16M"><constant>V4L2_PIX_FMT_NV16M</constant></refname> + <refname id="V4L2-PIX-FMT-NV61M"><constant>V4L2_PIX_FMT_NV61M</constant></refname> + <refpurpose>Variation of <constant>V4L2_PIX_FMT_NV16</constant> and <constant>V4L2_PIX_FMT_NV61</constant> with planes + non contiguous in memory. </refpurpose> + </refnamediv> + <refsect1> + <title>Description</title> + + <para>This is a multi-planar, two-plane version of the YUV 4:2:2 format. +The three components are separated into two sub-images or planes. +<constant>V4L2_PIX_FMT_NV16M</constant> differs from <constant>V4L2_PIX_FMT_NV16 +</constant> in that the two planes are non-contiguous in memory, i.e. the chroma +plane does not necessarily immediately follow the luma plane. +The luminance data occupies the first plane. The Y plane has one byte per pixel. +In the second plane there is chrominance data with alternating chroma samples. +The CbCr plane is the same width and height, in bytes, as the Y plane. +Each CbCr pair belongs to two pixels. For example, +Cb<subscript>0</subscript>/Cr<subscript>0</subscript> belongs to +Y'<subscript>00</subscript>, Y'<subscript>01</subscript>. +<constant>V4L2_PIX_FMT_NV61M</constant> is the same as <constant>V4L2_PIX_FMT_NV16M</constant> +except the Cb and Cr bytes are swapped, the CrCb plane starts with a Cr byte.</para> + + <para><constant>V4L2_PIX_FMT_NV16M</constant> and +<constant>V4L2_PIX_FMT_NV61M</constant> are intended to be used only in drivers +and applications that support the multi-planar API, described in +<xref linkend="planar-apis"/>. </para> + + <example> + <title><constant>V4L2_PIX_FMT_NV16M</constant> 4 × 4 pixel image</title> + + <formalpara> + <title>Byte Order.</title> + <para>Each cell is one byte. + <informaltable frame="none"> + <tgroup cols="5" align="center"> + <colspec align="left" colwidth="2*" /> + <tbody valign="top"> + <row> + <entry>start0 + 0:</entry> + <entry>Y'<subscript>00</subscript></entry> + <entry>Y'<subscript>01</subscript></entry> + <entry>Y'<subscript>02</subscript></entry> + <entry>Y'<subscript>03</subscript></entry> + </row> + <row> + <entry>start0 + 4:</entry> + <entry>Y'<subscript>10</subscript></entry> + <entry>Y'<subscript>11</subscript></entry> + <entry>Y'<subscript>12</subscript></entry> + <entry>Y'<subscript>13</subscript></entry> + </row> + <row> + <entry>start0 + 8:</entry> + <entry>Y'<subscript>20</subscript></entry> + <entry>Y'<subscript>21</subscript></entry> + <entry>Y'<subscript>22</subscript></entry> + <entry>Y'<subscript>23</subscript></entry> + </row> + <row> + <entry>start0 + 12:</entry> + <entry>Y'<subscript>30</subscript></entry> + <entry>Y'<subscript>31</subscript></entry> + <entry>Y'<subscript>32</subscript></entry> + <entry>Y'<subscript>33</subscript></entry> + </row> + <row> + <entry></entry> + </row> + <row> + <entry>start1 + 0:</entry> + <entry>Cb<subscript>00</subscript></entry> + <entry>Cr<subscript>00</subscript></entry> + <entry>Cb<subscript>02</subscript></entry> + <entry>Cr<subscript>02</subscript></entry> + </row> + <row> + <entry>start1 + 4:</entry> + <entry>Cb<subscript>10</subscript></entry> + <entry>Cr<subscript>10</subscript></entry> + <entry>Cb<subscript>12</subscript></entry> + <entry>Cr<subscript>12</subscript></entry> + </row> + <row> + <entry>start1 + 8:</entry> + <entry>Cb<subscript>20</subscript></entry> + <entry>Cr<subscript>20</subscript></entry> + <entry>Cb<subscript>22</subscript></entry> + <entry>Cr<subscript>22</subscript></entry> + </row> + <row> + <entry>start1 + 12:</entry> + <entry>Cb<subscript>30</subscript></entry> + <entry>Cr<subscript>30</subscript></entry> + <entry>Cb<subscript>32</subscript></entry> + <entry>Cr<subscript>32</subscript></entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + + <formalpara> + <title>Color Sample Location.</title> + <para> + <informaltable frame="none"> + <tgroup cols="7" align="center"> + <tbody valign="top"> + <row> + <entry></entry> + <entry>0</entry><entry></entry><entry>1</entry><entry></entry> + <entry>2</entry><entry></entry><entry>3</entry> + </row> + <row> + <entry>0</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + <row> + <entry></entry> + <entry></entry><entry>C</entry><entry></entry><entry></entry> + <entry></entry><entry>C</entry><entry></entry> + </row> + <row> + <entry>1</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + <row> + <entry></entry> + <entry></entry><entry>C</entry><entry></entry><entry></entry> + <entry></entry><entry>C</entry><entry></entry> + </row> + <row> + <entry></entry> + </row> + <row> + <entry>2</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + <row> + <entry></entry> + <entry></entry><entry>C</entry><entry></entry><entry></entry> + <entry></entry><entry>C</entry><entry></entry> + </row> + <row> + <entry>3</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + <row> + <entry></entry> + <entry></entry><entry>C</entry><entry></entry><entry></entry> + <entry></entry><entry>C</entry><entry></entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + </example> + </refsect1> + </refentry> diff --git a/Documentation/DocBook/media/v4l/pixfmt-nv24.xml b/Documentation/DocBook/media/v4l/pixfmt-nv24.xml new file mode 100644 index 00000000000..fb255f2ca9d --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-nv24.xml @@ -0,0 +1,121 @@ + <refentry> + <refmeta> + <refentrytitle>V4L2_PIX_FMT_NV24 ('NV24'), V4L2_PIX_FMT_NV42 ('NV42')</refentrytitle> + &manvol; + </refmeta> + <refnamediv> + <refname id="V4L2-PIX-FMT-NV24"><constant>V4L2_PIX_FMT_NV24</constant></refname> + <refname id="V4L2-PIX-FMT-NV42"><constant>V4L2_PIX_FMT_NV42</constant></refname> + <refpurpose>Formats with full horizontal and vertical +chroma resolutions, also known as YUV 4:4:4. One luminance and one +chrominance plane with alternating chroma samples as opposed to +<constant>V4L2_PIX_FMT_YVU420</constant></refpurpose> + </refnamediv> + <refsect1> + <title>Description</title> + + <para>These are two-plane versions of the YUV 4:4:4 format. The three + components are separated into two sub-images or planes. The Y plane is + first, with each Y sample stored in one byte per pixel. For + <constant>V4L2_PIX_FMT_NV24</constant>, a combined CbCr plane + immediately follows the Y plane in memory. The CbCr plane has the same + width and height, in pixels, as the Y plane (and the image). Each line + contains one CbCr pair per pixel, with each Cb and Cr sample stored in + one byte. <constant>V4L2_PIX_FMT_NV42</constant> is the same except that + the Cb and Cr samples are swapped, the CrCb plane starts with a Cr + sample.</para> + + <para>If the Y plane has pad bytes after each row, then the CbCr plane + has twice as many pad bytes after its rows.</para> + + <example> + <title><constant>V4L2_PIX_FMT_NV24</constant> 4 × 4 +pixel image</title> + + <formalpara> + <title>Byte Order.</title> + <para>Each cell is one byte. + <informaltable frame="none"> + <tgroup cols="9" align="center"> + <colspec align="left" colwidth="2*" /> + <tbody valign="top"> + <row> + <entry>start + 0:</entry> + <entry>Y'<subscript>00</subscript></entry> + <entry>Y'<subscript>01</subscript></entry> + <entry>Y'<subscript>02</subscript></entry> + <entry>Y'<subscript>03</subscript></entry> + </row> + <row> + <entry>start + 4:</entry> + <entry>Y'<subscript>10</subscript></entry> + <entry>Y'<subscript>11</subscript></entry> + <entry>Y'<subscript>12</subscript></entry> + <entry>Y'<subscript>13</subscript></entry> + </row> + <row> + <entry>start + 8:</entry> + <entry>Y'<subscript>20</subscript></entry> + <entry>Y'<subscript>21</subscript></entry> + <entry>Y'<subscript>22</subscript></entry> + <entry>Y'<subscript>23</subscript></entry> + </row> + <row> + <entry>start + 12:</entry> + <entry>Y'<subscript>30</subscript></entry> + <entry>Y'<subscript>31</subscript></entry> + <entry>Y'<subscript>32</subscript></entry> + <entry>Y'<subscript>33</subscript></entry> + </row> + <row> + <entry>start + 16:</entry> + <entry>Cb<subscript>00</subscript></entry> + <entry>Cr<subscript>00</subscript></entry> + <entry>Cb<subscript>01</subscript></entry> + <entry>Cr<subscript>01</subscript></entry> + <entry>Cb<subscript>02</subscript></entry> + <entry>Cr<subscript>02</subscript></entry> + <entry>Cb<subscript>03</subscript></entry> + <entry>Cr<subscript>03</subscript></entry> + </row> + <row> + <entry>start + 24:</entry> + <entry>Cb<subscript>10</subscript></entry> + <entry>Cr<subscript>10</subscript></entry> + <entry>Cb<subscript>11</subscript></entry> + <entry>Cr<subscript>11</subscript></entry> + <entry>Cb<subscript>12</subscript></entry> + <entry>Cr<subscript>12</subscript></entry> + <entry>Cb<subscript>13</subscript></entry> + <entry>Cr<subscript>13</subscript></entry> + </row> + <row> + <entry>start + 32:</entry> + <entry>Cb<subscript>20</subscript></entry> + <entry>Cr<subscript>20</subscript></entry> + <entry>Cb<subscript>21</subscript></entry> + <entry>Cr<subscript>21</subscript></entry> + <entry>Cb<subscript>22</subscript></entry> + <entry>Cr<subscript>22</subscript></entry> + <entry>Cb<subscript>23</subscript></entry> + <entry>Cr<subscript>23</subscript></entry> + </row> + <row> + <entry>start + 40:</entry> + <entry>Cb<subscript>30</subscript></entry> + <entry>Cr<subscript>30</subscript></entry> + <entry>Cb<subscript>31</subscript></entry> + <entry>Cr<subscript>31</subscript></entry> + <entry>Cb<subscript>32</subscript></entry> + <entry>Cr<subscript>32</subscript></entry> + <entry>Cb<subscript>33</subscript></entry> + <entry>Cr<subscript>33</subscript></entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + </example> + </refsect1> + </refentry> diff --git a/Documentation/DocBook/media/v4l/pixfmt-packed-rgb.xml b/Documentation/DocBook/media/v4l/pixfmt-packed-rgb.xml new file mode 100644 index 00000000000..e1c4f8b4c0b --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-packed-rgb.xml @@ -0,0 +1,520 @@ +<refentry id="packed-rgb"> + <refmeta> + <refentrytitle>Packed RGB formats</refentrytitle> + &manvol; + </refmeta> + <refnamediv> + <refname>Packed RGB formats</refname> + <refpurpose>Packed RGB formats</refpurpose> + </refnamediv> + <refsect1> + <title>Description</title> + + <para>These formats are designed to match the pixel formats of +typical PC graphics frame buffers. They occupy 8, 16, 24 or 32 bits +per pixel. These are all packed-pixel formats, meaning all the data +for a pixel lie next to each other in memory.</para> + + <para>When one of these formats is used, drivers shall report the +colorspace <constant>V4L2_COLORSPACE_SRGB</constant>.</para> + + <table pgwide="1" frame="none" id="rgb-formats"> + <title>Packed RGB Image Formats</title> + <tgroup cols="37" align="center"> + <colspec colname="id" align="left" /> + <colspec colname="fourcc" /> + <colspec colname="bit" /> + + <colspec colnum="4" colname="b07" align="center" /> + <colspec colnum="5" colname="b06" align="center" /> + <colspec colnum="6" colname="b05" align="center" /> + <colspec colnum="7" colname="b04" align="center" /> + <colspec colnum="8" colname="b03" align="center" /> + <colspec colnum="9" colname="b02" align="center" /> + <colspec colnum="10" colname="b01" align="center" /> + <colspec colnum="11" colname="b00" align="center" /> + + <colspec colnum="13" colname="b17" align="center" /> + <colspec colnum="14" colname="b16" align="center" /> + <colspec colnum="15" colname="b15" align="center" /> + <colspec colnum="16" colname="b14" align="center" /> + <colspec colnum="17" colname="b13" align="center" /> + <colspec colnum="18" colname="b12" align="center" /> + <colspec colnum="19" colname="b11" align="center" /> + <colspec colnum="20" colname="b10" align="center" /> + + <colspec colnum="22" colname="b27" align="center" /> + <colspec colnum="23" colname="b26" align="center" /> + <colspec colnum="24" colname="b25" align="center" /> + <colspec colnum="25" colname="b24" align="center" /> + <colspec colnum="26" colname="b23" align="center" /> + <colspec colnum="27" colname="b22" align="center" /> + <colspec colnum="28" colname="b21" align="center" /> + <colspec colnum="29" colname="b20" align="center" /> + + <colspec colnum="31" colname="b37" align="center" /> + <colspec colnum="32" colname="b36" align="center" /> + <colspec colnum="33" colname="b35" align="center" /> + <colspec colnum="34" colname="b34" align="center" /> + <colspec colnum="35" colname="b33" align="center" /> + <colspec colnum="36" colname="b32" align="center" /> + <colspec colnum="37" colname="b31" align="center" /> + <colspec colnum="38" colname="b30" align="center" /> + + <spanspec namest="b07" nameend="b00" spanname="b0" /> + <spanspec namest="b17" nameend="b10" spanname="b1" /> + <spanspec namest="b27" nameend="b20" spanname="b2" /> + <spanspec namest="b37" nameend="b30" spanname="b3" /> + <thead> + <row> + <entry>Identifier</entry> + <entry>Code</entry> + <entry> </entry> + <entry spanname="b0">Byte 0 in memory</entry> + <entry spanname="b1">Byte 1</entry> + <entry spanname="b2">Byte 2</entry> + <entry spanname="b3">Byte 3</entry> + </row> + <row> + <entry> </entry> + <entry> </entry> + <entry>Bit</entry> + <entry>7</entry> + <entry>6</entry> + <entry>5</entry> + <entry>4</entry> + <entry>3</entry> + <entry>2</entry> + <entry>1</entry> + <entry>0</entry> + <entry> </entry> + <entry>7</entry> + <entry>6</entry> + <entry>5</entry> + <entry>4</entry> + <entry>3</entry> + <entry>2</entry> + <entry>1</entry> + <entry>0</entry> + <entry> </entry> + <entry>7</entry> + <entry>6</entry> + <entry>5</entry> + <entry>4</entry> + <entry>3</entry> + <entry>2</entry> + <entry>1</entry> + <entry>0</entry> + <entry> </entry> + <entry>7</entry> + <entry>6</entry> + <entry>5</entry> + <entry>4</entry> + <entry>3</entry> + <entry>2</entry> + <entry>1</entry> + <entry>0</entry> + </row> + </thead> + <tbody valign="top"> + <row id="V4L2-PIX-FMT-RGB332"> + <entry><constant>V4L2_PIX_FMT_RGB332</constant></entry> + <entry>'RGB1'</entry> + <entry></entry> + <entry>r<subscript>2</subscript></entry> + <entry>r<subscript>1</subscript></entry> + <entry>r<subscript>0</subscript></entry> + <entry>g<subscript>2</subscript></entry> + <entry>g<subscript>1</subscript></entry> + <entry>g<subscript>0</subscript></entry> + <entry>b<subscript>1</subscript></entry> + <entry>b<subscript>0</subscript></entry> + </row> + <row id="V4L2-PIX-FMT-RGB444"> + <entry><constant>V4L2_PIX_FMT_RGB444</constant></entry> + <entry>'R444'</entry> + <entry></entry> + <entry>g<subscript>3</subscript></entry> + <entry>g<subscript>2</subscript></entry> + <entry>g<subscript>1</subscript></entry> + <entry>g<subscript>0</subscript></entry> + <entry>b<subscript>3</subscript></entry> + <entry>b<subscript>2</subscript></entry> + <entry>b<subscript>1</subscript></entry> + <entry>b<subscript>0</subscript></entry> + <entry></entry> + <entry>a<subscript>3</subscript></entry> + <entry>a<subscript>2</subscript></entry> + <entry>a<subscript>1</subscript></entry> + <entry>a<subscript>0</subscript></entry> + <entry>r<subscript>3</subscript></entry> + <entry>r<subscript>2</subscript></entry> + <entry>r<subscript>1</subscript></entry> + <entry>r<subscript>0</subscript></entry> + </row> + <row id="V4L2-PIX-FMT-RGB555"> + <entry><constant>V4L2_PIX_FMT_RGB555</constant></entry> + <entry>'RGBO'</entry> + <entry></entry> + <entry>g<subscript>2</subscript></entry> + <entry>g<subscript>1</subscript></entry> + <entry>g<subscript>0</subscript></entry> + <entry>b<subscript>4</subscript></entry> + <entry>b<subscript>3</subscript></entry> + <entry>b<subscript>2</subscript></entry> + <entry>b<subscript>1</subscript></entry> + <entry>b<subscript>0</subscript></entry> + <entry></entry> + <entry>a</entry> + <entry>r<subscript>4</subscript></entry> + <entry>r<subscript>3</subscript></entry> + <entry>r<subscript>2</subscript></entry> + <entry>r<subscript>1</subscript></entry> + <entry>r<subscript>0</subscript></entry> + <entry>g<subscript>4</subscript></entry> + <entry>g<subscript>3</subscript></entry> + </row> + <row id="V4L2-PIX-FMT-RGB565"> + <entry><constant>V4L2_PIX_FMT_RGB565</constant></entry> + <entry>'RGBP'</entry> + <entry></entry> + <entry>g<subscript>2</subscript></entry> + <entry>g<subscript>1</subscript></entry> + <entry>g<subscript>0</subscript></entry> + <entry>b<subscript>4</subscript></entry> + <entry>b<subscript>3</subscript></entry> + <entry>b<subscript>2</subscript></entry> + <entry>b<subscript>1</subscript></entry> + <entry>b<subscript>0</subscript></entry> + <entry></entry> + <entry>r<subscript>4</subscript></entry> + <entry>r<subscript>3</subscript></entry> + <entry>r<subscript>2</subscript></entry> + <entry>r<subscript>1</subscript></entry> + <entry>r<subscript>0</subscript></entry> + <entry>g<subscript>5</subscript></entry> + <entry>g<subscript>4</subscript></entry> + <entry>g<subscript>3</subscript></entry> + </row> + <row id="V4L2-PIX-FMT-RGB555X"> + <entry><constant>V4L2_PIX_FMT_RGB555X</constant></entry> + <entry>'RGBQ'</entry> + <entry></entry> + <entry>a</entry> + <entry>r<subscript>4</subscript></entry> + <entry>r<subscript>3</subscript></entry> + <entry>r<subscript>2</subscript></entry> + <entry>r<subscript>1</subscript></entry> + <entry>r<subscript>0</subscript></entry> + <entry>g<subscript>4</subscript></entry> + <entry>g<subscript>3</subscript></entry> + <entry></entry> + <entry>g<subscript>2</subscript></entry> + <entry>g<subscript>1</subscript></entry> + <entry>g<subscript>0</subscript></entry> + <entry>b<subscript>4</subscript></entry> + <entry>b<subscript>3</subscript></entry> + <entry>b<subscript>2</subscript></entry> + <entry>b<subscript>1</subscript></entry> + <entry>b<subscript>0</subscript></entry> + </row> + <row id="V4L2-PIX-FMT-RGB565X"> + <entry><constant>V4L2_PIX_FMT_RGB565X</constant></entry> + <entry>'RGBR'</entry> + <entry></entry> + <entry>r<subscript>4</subscript></entry> + <entry>r<subscript>3</subscript></entry> + <entry>r<subscript>2</subscript></entry> + <entry>r<subscript>1</subscript></entry> + <entry>r<subscript>0</subscript></entry> + <entry>g<subscript>5</subscript></entry> + <entry>g<subscript>4</subscript></entry> + <entry>g<subscript>3</subscript></entry> + <entry></entry> + <entry>g<subscript>2</subscript></entry> + <entry>g<subscript>1</subscript></entry> + <entry>g<subscript>0</subscript></entry> + <entry>b<subscript>4</subscript></entry> + <entry>b<subscript>3</subscript></entry> + <entry>b<subscript>2</subscript></entry> + <entry>b<subscript>1</subscript></entry> + <entry>b<subscript>0</subscript></entry> + </row> + <row id="V4L2-PIX-FMT-BGR666"> + <entry><constant>V4L2_PIX_FMT_BGR666</constant></entry> + <entry>'BGRH'</entry> + <entry></entry> + <entry>b<subscript>5</subscript></entry> + <entry>b<subscript>4</subscript></entry> + <entry>b<subscript>3</subscript></entry> + <entry>b<subscript>2</subscript></entry> + <entry>b<subscript>1</subscript></entry> + <entry>b<subscript>0</subscript></entry> + <entry>g<subscript>5</subscript></entry> + <entry>g<subscript>4</subscript></entry> + <entry></entry> + <entry>g<subscript>3</subscript></entry> + <entry>g<subscript>2</subscript></entry> + <entry>g<subscript>1</subscript></entry> + <entry>g<subscript>0</subscript></entry> + <entry>r<subscript>5</subscript></entry> + <entry>r<subscript>4</subscript></entry> + <entry>r<subscript>3</subscript></entry> + <entry>r<subscript>2</subscript></entry> + <entry></entry> + <entry>r<subscript>1</subscript></entry> + <entry>r<subscript>0</subscript></entry> + <entry></entry> + <entry></entry> + <entry></entry> + <entry></entry> + <entry></entry> + <entry></entry> + <entry></entry> + <entry></entry> + <entry></entry> + <entry></entry> + <entry></entry> + <entry></entry> + <entry></entry> + <entry></entry> + </row> + <row id="V4L2-PIX-FMT-BGR24"> + <entry><constant>V4L2_PIX_FMT_BGR24</constant></entry> + <entry>'BGR3'</entry> + <entry></entry> + <entry>b<subscript>7</subscript></entry> + <entry>b<subscript>6</subscript></entry> + <entry>b<subscript>5</subscript></entry> + <entry>b<subscript>4</subscript></entry> + <entry>b<subscript>3</subscript></entry> + <entry>b<subscript>2</subscript></entry> + <entry>b<subscript>1</subscript></entry> + <entry>b<subscript>0</subscript></entry> + <entry></entry> + <entry>g<subscript>7</subscript></entry> + <entry>g<subscript>6</subscript></entry> + <entry>g<subscript>5</subscript></entry> + <entry>g<subscript>4</subscript></entry> + <entry>g<subscript>3</subscript></entry> + <entry>g<subscript>2</subscript></entry> + <entry>g<subscript>1</subscript></entry> + <entry>g<subscript>0</subscript></entry> + <entry></entry> + <entry>r<subscript>7</subscript></entry> + <entry>r<subscript>6</subscript></entry> + <entry>r<subscript>5</subscript></entry> + <entry>r<subscript>4</subscript></entry> + <entry>r<subscript>3</subscript></entry> + <entry>r<subscript>2</subscript></entry> + <entry>r<subscript>1</subscript></entry> + <entry>r<subscript>0</subscript></entry> + </row> + <row id="V4L2-PIX-FMT-RGB24"> + <entry><constant>V4L2_PIX_FMT_RGB24</constant></entry> + <entry>'RGB3'</entry> + <entry></entry> + <entry>r<subscript>7</subscript></entry> + <entry>r<subscript>6</subscript></entry> + <entry>r<subscript>5</subscript></entry> + <entry>r<subscript>4</subscript></entry> + <entry>r<subscript>3</subscript></entry> + <entry>r<subscript>2</subscript></entry> + <entry>r<subscript>1</subscript></entry> + <entry>r<subscript>0</subscript></entry> + <entry></entry> + <entry>g<subscript>7</subscript></entry> + <entry>g<subscript>6</subscript></entry> + <entry>g<subscript>5</subscript></entry> + <entry>g<subscript>4</subscript></entry> + <entry>g<subscript>3</subscript></entry> + <entry>g<subscript>2</subscript></entry> + <entry>g<subscript>1</subscript></entry> + <entry>g<subscript>0</subscript></entry> + <entry></entry> + <entry>b<subscript>7</subscript></entry> + <entry>b<subscript>6</subscript></entry> + <entry>b<subscript>5</subscript></entry> + <entry>b<subscript>4</subscript></entry> + <entry>b<subscript>3</subscript></entry> + <entry>b<subscript>2</subscript></entry> + <entry>b<subscript>1</subscript></entry> + <entry>b<subscript>0</subscript></entry> + </row> + <row id="V4L2-PIX-FMT-BGR32"> + <entry><constant>V4L2_PIX_FMT_BGR32</constant></entry> + <entry>'BGR4'</entry> + <entry></entry> + <entry>b<subscript>7</subscript></entry> + <entry>b<subscript>6</subscript></entry> + <entry>b<subscript>5</subscript></entry> + <entry>b<subscript>4</subscript></entry> + <entry>b<subscript>3</subscript></entry> + <entry>b<subscript>2</subscript></entry> + <entry>b<subscript>1</subscript></entry> + <entry>b<subscript>0</subscript></entry> + <entry></entry> + <entry>g<subscript>7</subscript></entry> + <entry>g<subscript>6</subscript></entry> + <entry>g<subscript>5</subscript></entry> + <entry>g<subscript>4</subscript></entry> + <entry>g<subscript>3</subscript></entry> + <entry>g<subscript>2</subscript></entry> + <entry>g<subscript>1</subscript></entry> + <entry>g<subscript>0</subscript></entry> + <entry></entry> + <entry>r<subscript>7</subscript></entry> + <entry>r<subscript>6</subscript></entry> + <entry>r<subscript>5</subscript></entry> + <entry>r<subscript>4</subscript></entry> + <entry>r<subscript>3</subscript></entry> + <entry>r<subscript>2</subscript></entry> + <entry>r<subscript>1</subscript></entry> + <entry>r<subscript>0</subscript></entry> + <entry></entry> + <entry>a<subscript>7</subscript></entry> + <entry>a<subscript>6</subscript></entry> + <entry>a<subscript>5</subscript></entry> + <entry>a<subscript>4</subscript></entry> + <entry>a<subscript>3</subscript></entry> + <entry>a<subscript>2</subscript></entry> + <entry>a<subscript>1</subscript></entry> + <entry>a<subscript>0</subscript></entry> + </row> + <row id="V4L2-PIX-FMT-RGB32"> + <entry><constant>V4L2_PIX_FMT_RGB32</constant></entry> + <entry>'RGB4'</entry> + <entry></entry> + <entry>a<subscript>7</subscript></entry> + <entry>a<subscript>6</subscript></entry> + <entry>a<subscript>5</subscript></entry> + <entry>a<subscript>4</subscript></entry> + <entry>a<subscript>3</subscript></entry> + <entry>a<subscript>2</subscript></entry> + <entry>a<subscript>1</subscript></entry> + <entry>a<subscript>0</subscript></entry> + <entry></entry> + <entry>r<subscript>7</subscript></entry> + <entry>r<subscript>6</subscript></entry> + <entry>r<subscript>5</subscript></entry> + <entry>r<subscript>4</subscript></entry> + <entry>r<subscript>3</subscript></entry> + <entry>r<subscript>2</subscript></entry> + <entry>r<subscript>1</subscript></entry> + <entry>r<subscript>0</subscript></entry> + <entry></entry> + <entry>g<subscript>7</subscript></entry> + <entry>g<subscript>6</subscript></entry> + <entry>g<subscript>5</subscript></entry> + <entry>g<subscript>4</subscript></entry> + <entry>g<subscript>3</subscript></entry> + <entry>g<subscript>2</subscript></entry> + <entry>g<subscript>1</subscript></entry> + <entry>g<subscript>0</subscript></entry> + <entry></entry> + <entry>b<subscript>7</subscript></entry> + <entry>b<subscript>6</subscript></entry> + <entry>b<subscript>5</subscript></entry> + <entry>b<subscript>4</subscript></entry> + <entry>b<subscript>3</subscript></entry> + <entry>b<subscript>2</subscript></entry> + <entry>b<subscript>1</subscript></entry> + <entry>b<subscript>0</subscript></entry> + </row> + </tbody> + </tgroup> + </table> + + <para>Bit 7 is the most significant bit. The value of the a = alpha +bits is undefined when reading from the driver, ignored when writing +to the driver, except when alpha blending has been negotiated for a +<link linkend="overlay">Video Overlay</link> or <link linkend="osd"> +Video Output Overlay</link> or when the alpha component has been configured +for a <link linkend="capture">Video Capture</link> by means of <link +linkend="v4l2-alpha-component"> <constant>V4L2_CID_ALPHA_COMPONENT +</constant> </link> control.</para> + + <example> + <title><constant>V4L2_PIX_FMT_BGR24</constant> 4 × 4 pixel +image</title> + + <formalpara> + <title>Byte Order.</title> + <para>Each cell is one byte. + <informaltable frame="none"> + <tgroup cols="13" align="center"> + <colspec align="left" colwidth="2*" /> + <tbody valign="top"> + <row> + <entry>start + 0:</entry> + <entry>B<subscript>00</subscript></entry> + <entry>G<subscript>00</subscript></entry> + <entry>R<subscript>00</subscript></entry> + <entry>B<subscript>01</subscript></entry> + <entry>G<subscript>01</subscript></entry> + <entry>R<subscript>01</subscript></entry> + <entry>B<subscript>02</subscript></entry> + <entry>G<subscript>02</subscript></entry> + <entry>R<subscript>02</subscript></entry> + <entry>B<subscript>03</subscript></entry> + <entry>G<subscript>03</subscript></entry> + <entry>R<subscript>03</subscript></entry> + </row> + <row> + <entry>start + 12:</entry> + <entry>B<subscript>10</subscript></entry> + <entry>G<subscript>10</subscript></entry> + <entry>R<subscript>10</subscript></entry> + <entry>B<subscript>11</subscript></entry> + <entry>G<subscript>11</subscript></entry> + <entry>R<subscript>11</subscript></entry> + <entry>B<subscript>12</subscript></entry> + <entry>G<subscript>12</subscript></entry> + <entry>R<subscript>12</subscript></entry> + <entry>B<subscript>13</subscript></entry> + <entry>G<subscript>13</subscript></entry> + <entry>R<subscript>13</subscript></entry> + </row> + <row> + <entry>start + 24:</entry> + <entry>B<subscript>20</subscript></entry> + <entry>G<subscript>20</subscript></entry> + <entry>R<subscript>20</subscript></entry> + <entry>B<subscript>21</subscript></entry> + <entry>G<subscript>21</subscript></entry> + <entry>R<subscript>21</subscript></entry> + <entry>B<subscript>22</subscript></entry> + <entry>G<subscript>22</subscript></entry> + <entry>R<subscript>22</subscript></entry> + <entry>B<subscript>23</subscript></entry> + <entry>G<subscript>23</subscript></entry> + <entry>R<subscript>23</subscript></entry> + </row> + <row> + <entry>start + 36:</entry> + <entry>B<subscript>30</subscript></entry> + <entry>G<subscript>30</subscript></entry> + <entry>R<subscript>30</subscript></entry> + <entry>B<subscript>31</subscript></entry> + <entry>G<subscript>31</subscript></entry> + <entry>R<subscript>31</subscript></entry> + <entry>B<subscript>32</subscript></entry> + <entry>G<subscript>32</subscript></entry> + <entry>R<subscript>32</subscript></entry> + <entry>B<subscript>33</subscript></entry> + <entry>G<subscript>33</subscript></entry> + <entry>R<subscript>33</subscript></entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + </example> + + <para>A test utility to determine which RGB formats a driver +actually supports is available from the LinuxTV v4l-dvb repository. +See &v4l-dvb; for access instructions.</para> + + </refsect1> + </refentry> diff --git a/Documentation/DocBook/media/v4l/pixfmt-packed-yuv.xml b/Documentation/DocBook/media/v4l/pixfmt-packed-yuv.xml new file mode 100644 index 00000000000..33fa5a47a86 --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-packed-yuv.xml @@ -0,0 +1,236 @@ +<refentry id="packed-yuv"> + <refmeta> + <refentrytitle>Packed YUV formats</refentrytitle> + &manvol; + </refmeta> + <refnamediv> + <refname>Packed YUV formats</refname> + <refpurpose>Packed YUV formats</refpurpose> + </refnamediv> + <refsect1> + <title>Description</title> + + <para>Similar to the packed RGB formats these formats store +the Y, Cb and Cr component of each pixel in one 16 or 32 bit +word.</para> + + <table pgwide="1" frame="none"> + <title>Packed YUV Image Formats</title> + <tgroup cols="37" align="center"> + <colspec colname="id" align="left" /> + <colspec colname="fourcc" /> + <colspec colname="bit" /> + + <colspec colnum="4" colname="b07" align="center" /> + <colspec colnum="5" colname="b06" align="center" /> + <colspec colnum="6" colname="b05" align="center" /> + <colspec colnum="7" colname="b04" align="center" /> + <colspec colnum="8" colname="b03" align="center" /> + <colspec colnum="9" colname="b02" align="center" /> + <colspec colnum="10" colname="b01" align="center" /> + <colspec colnum="11" colname="b00" align="center" /> + + <colspec colnum="13" colname="b17" align="center" /> + <colspec colnum="14" colname="b16" align="center" /> + <colspec colnum="15" colname="b15" align="center" /> + <colspec colnum="16" colname="b14" align="center" /> + <colspec colnum="17" colname="b13" align="center" /> + <colspec colnum="18" colname="b12" align="center" /> + <colspec colnum="19" colname="b11" align="center" /> + <colspec colnum="20" colname="b10" align="center" /> + + <colspec colnum="22" colname="b27" align="center" /> + <colspec colnum="23" colname="b26" align="center" /> + <colspec colnum="24" colname="b25" align="center" /> + <colspec colnum="25" colname="b24" align="center" /> + <colspec colnum="26" colname="b23" align="center" /> + <colspec colnum="27" colname="b22" align="center" /> + <colspec colnum="28" colname="b21" align="center" /> + <colspec colnum="29" colname="b20" align="center" /> + + <colspec colnum="31" colname="b37" align="center" /> + <colspec colnum="32" colname="b36" align="center" /> + <colspec colnum="33" colname="b35" align="center" /> + <colspec colnum="34" colname="b34" align="center" /> + <colspec colnum="35" colname="b33" align="center" /> + <colspec colnum="36" colname="b32" align="center" /> + <colspec colnum="37" colname="b31" align="center" /> + <colspec colnum="38" colname="b30" align="center" /> + + <spanspec namest="b07" nameend="b00" spanname="b0" /> + <spanspec namest="b17" nameend="b10" spanname="b1" /> + <spanspec namest="b27" nameend="b20" spanname="b2" /> + <spanspec namest="b37" nameend="b30" spanname="b3" /> + <thead> + <row> + <entry>Identifier</entry> + <entry>Code</entry> + <entry> </entry> + <entry spanname="b0">Byte 0 in memory</entry> + <entry spanname="b1">Byte 1</entry> + <entry spanname="b2">Byte 2</entry> + <entry spanname="b3">Byte 3</entry> + </row> + <row> + <entry> </entry> + <entry> </entry> + <entry>Bit</entry> + <entry>7</entry> + <entry>6</entry> + <entry>5</entry> + <entry>4</entry> + <entry>3</entry> + <entry>2</entry> + <entry>1</entry> + <entry>0</entry> + <entry> </entry> + <entry>7</entry> + <entry>6</entry> + <entry>5</entry> + <entry>4</entry> + <entry>3</entry> + <entry>2</entry> + <entry>1</entry> + <entry>0</entry> + <entry> </entry> + <entry>7</entry> + <entry>6</entry> + <entry>5</entry> + <entry>4</entry> + <entry>3</entry> + <entry>2</entry> + <entry>1</entry> + <entry>0</entry> + <entry> </entry> + <entry>7</entry> + <entry>6</entry> + <entry>5</entry> + <entry>4</entry> + <entry>3</entry> + <entry>2</entry> + <entry>1</entry> + <entry>0</entry> + </row> + </thead> + <tbody valign="top"> + <row id="V4L2-PIX-FMT-YUV444"> + <entry><constant>V4L2_PIX_FMT_YUV444</constant></entry> + <entry>'Y444'</entry> + <entry></entry> + <entry>Cb<subscript>3</subscript></entry> + <entry>Cb<subscript>2</subscript></entry> + <entry>Cb<subscript>1</subscript></entry> + <entry>Cb<subscript>0</subscript></entry> + <entry>Cr<subscript>3</subscript></entry> + <entry>Cr<subscript>2</subscript></entry> + <entry>Cr<subscript>1</subscript></entry> + <entry>Cr<subscript>0</subscript></entry> + <entry></entry> + <entry>a<subscript>3</subscript></entry> + <entry>a<subscript>2</subscript></entry> + <entry>a<subscript>1</subscript></entry> + <entry>a<subscript>0</subscript></entry> + <entry>Y'<subscript>3</subscript></entry> + <entry>Y'<subscript>2</subscript></entry> + <entry>Y'<subscript>1</subscript></entry> + <entry>Y'<subscript>0</subscript></entry> + </row> + + <row id="V4L2-PIX-FMT-YUV555"> + <entry><constant>V4L2_PIX_FMT_YUV555</constant></entry> + <entry>'YUVO'</entry> + <entry></entry> + <entry>Cb<subscript>2</subscript></entry> + <entry>Cb<subscript>1</subscript></entry> + <entry>Cb<subscript>0</subscript></entry> + <entry>Cr<subscript>4</subscript></entry> + <entry>Cr<subscript>3</subscript></entry> + <entry>Cr<subscript>2</subscript></entry> + <entry>Cr<subscript>1</subscript></entry> + <entry>Cr<subscript>0</subscript></entry> + <entry></entry> + <entry>a</entry> + <entry>Y'<subscript>4</subscript></entry> + <entry>Y'<subscript>3</subscript></entry> + <entry>Y'<subscript>2</subscript></entry> + <entry>Y'<subscript>1</subscript></entry> + <entry>Y'<subscript>0</subscript></entry> + <entry>Cb<subscript>4</subscript></entry> + <entry>Cb<subscript>3</subscript></entry> + </row> + + <row id="V4L2-PIX-FMT-YUV565"> + <entry><constant>V4L2_PIX_FMT_YUV565</constant></entry> + <entry>'YUVP'</entry> + <entry></entry> + <entry>Cb<subscript>2</subscript></entry> + <entry>Cb<subscript>1</subscript></entry> + <entry>Cb<subscript>0</subscript></entry> + <entry>Cr<subscript>4</subscript></entry> + <entry>Cr<subscript>3</subscript></entry> + <entry>Cr<subscript>2</subscript></entry> + <entry>Cr<subscript>1</subscript></entry> + <entry>Cr<subscript>0</subscript></entry> + <entry></entry> + <entry>Y'<subscript>4</subscript></entry> + <entry>Y'<subscript>3</subscript></entry> + <entry>Y'<subscript>2</subscript></entry> + <entry>Y'<subscript>1</subscript></entry> + <entry>Y'<subscript>0</subscript></entry> + <entry>Cb<subscript>5</subscript></entry> + <entry>Cb<subscript>4</subscript></entry> + <entry>Cb<subscript>3</subscript></entry> + </row> + + <row id="V4L2-PIX-FMT-YUV32"> + <entry><constant>V4L2_PIX_FMT_YUV32</constant></entry> + <entry>'YUV4'</entry> + <entry></entry> + <entry>a<subscript>7</subscript></entry> + <entry>a<subscript>6</subscript></entry> + <entry>a<subscript>5</subscript></entry> + <entry>a<subscript>4</subscript></entry> + <entry>a<subscript>3</subscript></entry> + <entry>a<subscript>2</subscript></entry> + <entry>a<subscript>1</subscript></entry> + <entry>a<subscript>0</subscript></entry> + <entry></entry> + <entry>Y'<subscript>7</subscript></entry> + <entry>Y'<subscript>6</subscript></entry> + <entry>Y'<subscript>5</subscript></entry> + <entry>Y'<subscript>4</subscript></entry> + <entry>Y'<subscript>3</subscript></entry> + <entry>Y'<subscript>2</subscript></entry> + <entry>Y'<subscript>1</subscript></entry> + <entry>Y'<subscript>0</subscript></entry> + <entry></entry> + <entry>Cb<subscript>7</subscript></entry> + <entry>Cb<subscript>6</subscript></entry> + <entry>Cb<subscript>5</subscript></entry> + <entry>Cb<subscript>4</subscript></entry> + <entry>Cb<subscript>3</subscript></entry> + <entry>Cb<subscript>2</subscript></entry> + <entry>Cb<subscript>1</subscript></entry> + <entry>Cb<subscript>0</subscript></entry> + <entry></entry> + <entry>Cr<subscript>7</subscript></entry> + <entry>Cr<subscript>6</subscript></entry> + <entry>Cr<subscript>5</subscript></entry> + <entry>Cr<subscript>4</subscript></entry> + <entry>Cr<subscript>3</subscript></entry> + <entry>Cr<subscript>2</subscript></entry> + <entry>Cr<subscript>1</subscript></entry> + <entry>Cr<subscript>0</subscript></entry> + </row> + </tbody> + </tgroup> + </table> + + <para>Bit 7 is the most significant bit. The value of a = alpha +bits is undefined when reading from the driver, ignored when writing +to the driver, except when alpha blending has been negotiated for a +<link linkend="overlay">Video Overlay</link> or <link +linkend="osd">Video Output Overlay</link>.</para> + + </refsect1> + </refentry> diff --git a/Documentation/DocBook/media/v4l/pixfmt-sbggr16.xml b/Documentation/DocBook/media/v4l/pixfmt-sbggr16.xml new file mode 100644 index 00000000000..6494b05d84a --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-sbggr16.xml @@ -0,0 +1,83 @@ +<refentry id="V4L2-PIX-FMT-SBGGR16"> + <refmeta> + <refentrytitle>V4L2_PIX_FMT_SBGGR16 ('BYR2')</refentrytitle> + &manvol; + </refmeta> + <refnamediv> + <refname><constant>V4L2_PIX_FMT_SBGGR16</constant></refname> + <refpurpose>Bayer RGB format</refpurpose> + </refnamediv> + <refsect1> + <title>Description</title> + + <para>This format is similar to <link +linkend="V4L2-PIX-FMT-SBGGR8"> +<constant>V4L2_PIX_FMT_SBGGR8</constant></link>, except each pixel has +a depth of 16 bits. The least significant byte is stored at lower +memory addresses (little-endian). Note the actual sampling precision +may be lower than 16 bits, for example 10 bits per pixel with values +in range 0 to 1023.</para> + + <example> + <title><constant>V4L2_PIX_FMT_SBGGR16</constant> 4 × 4 +pixel image</title> + + <formalpara> + <title>Byte Order.</title> + <para>Each cell is one byte. + <informaltable frame="none"> + <tgroup cols="5" align="center"> + <colspec align="left" colwidth="2*" /> + <tbody valign="top"> + <row> + <entry>start + 0:</entry> + <entry>B<subscript>00low</subscript></entry> + <entry>B<subscript>00high</subscript></entry> + <entry>G<subscript>01low</subscript></entry> + <entry>G<subscript>01high</subscript></entry> + <entry>B<subscript>02low</subscript></entry> + <entry>B<subscript>02high</subscript></entry> + <entry>G<subscript>03low</subscript></entry> + <entry>G<subscript>03high</subscript></entry> + </row> + <row> + <entry>start + 8:</entry> + <entry>G<subscript>10low</subscript></entry> + <entry>G<subscript>10high</subscript></entry> + <entry>R<subscript>11low</subscript></entry> + <entry>R<subscript>11high</subscript></entry> + <entry>G<subscript>12low</subscript></entry> + <entry>G<subscript>12high</subscript></entry> + <entry>R<subscript>13low</subscript></entry> + <entry>R<subscript>13high</subscript></entry> + </row> + <row> + <entry>start + 16:</entry> + <entry>B<subscript>20low</subscript></entry> + <entry>B<subscript>20high</subscript></entry> + <entry>G<subscript>21low</subscript></entry> + <entry>G<subscript>21high</subscript></entry> + <entry>B<subscript>22low</subscript></entry> + <entry>B<subscript>22high</subscript></entry> + <entry>G<subscript>23low</subscript></entry> + <entry>G<subscript>23high</subscript></entry> + </row> + <row> + <entry>start + 24:</entry> + <entry>G<subscript>30low</subscript></entry> + <entry>G<subscript>30high</subscript></entry> + <entry>R<subscript>31low</subscript></entry> + <entry>R<subscript>31high</subscript></entry> + <entry>G<subscript>32low</subscript></entry> + <entry>G<subscript>32high</subscript></entry> + <entry>R<subscript>33low</subscript></entry> + <entry>R<subscript>33high</subscript></entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + </example> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/pixfmt-sbggr8.xml b/Documentation/DocBook/media/v4l/pixfmt-sbggr8.xml new file mode 100644 index 00000000000..5eaf2b42d3f --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-sbggr8.xml @@ -0,0 +1,67 @@ + <refentry id="V4L2-PIX-FMT-SBGGR8"> + <refmeta> + <refentrytitle>V4L2_PIX_FMT_SBGGR8 ('BA81')</refentrytitle> + &manvol; + </refmeta> + <refnamediv> + <refname><constant>V4L2_PIX_FMT_SBGGR8</constant></refname> + <refpurpose>Bayer RGB format</refpurpose> + </refnamediv> + <refsect1> + <title>Description</title> + + <para>This is commonly the native format of digital cameras, +reflecting the arrangement of sensors on the CCD device. Only one red, +green or blue value is given for each pixel. Missing components must +be interpolated from neighbouring pixels. From left to right the first +row consists of a blue and green value, the second row of a green and +red value. This scheme repeats to the right and down for every two +columns and rows.</para> + + <example> + <title><constant>V4L2_PIX_FMT_SBGGR8</constant> 4 × 4 +pixel image</title> + + <formalpara> + <title>Byte Order.</title> + <para>Each cell is one byte. + <informaltable frame="none"> + <tgroup cols="5" align="center"> + <colspec align="left" colwidth="2*" /> + <tbody valign="top"> + <row> + <entry>start + 0:</entry> + <entry>B<subscript>00</subscript></entry> + <entry>G<subscript>01</subscript></entry> + <entry>B<subscript>02</subscript></entry> + <entry>G<subscript>03</subscript></entry> + </row> + <row> + <entry>start + 4:</entry> + <entry>G<subscript>10</subscript></entry> + <entry>R<subscript>11</subscript></entry> + <entry>G<subscript>12</subscript></entry> + <entry>R<subscript>13</subscript></entry> + </row> + <row> + <entry>start + 8:</entry> + <entry>B<subscript>20</subscript></entry> + <entry>G<subscript>21</subscript></entry> + <entry>B<subscript>22</subscript></entry> + <entry>G<subscript>23</subscript></entry> + </row> + <row> + <entry>start + 12:</entry> + <entry>G<subscript>30</subscript></entry> + <entry>R<subscript>31</subscript></entry> + <entry>G<subscript>32</subscript></entry> + <entry>R<subscript>33</subscript></entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + </example> + </refsect1> + </refentry> diff --git a/Documentation/DocBook/media/v4l/pixfmt-sdr-cu08.xml b/Documentation/DocBook/media/v4l/pixfmt-sdr-cu08.xml new file mode 100644 index 00000000000..2d80104c178 --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-sdr-cu08.xml @@ -0,0 +1,44 @@ +<refentry id="V4L2-SDR-FMT-CU08"> + <refmeta> + <refentrytitle>V4L2_SDR_FMT_CU8 ('CU08')</refentrytitle> + &manvol; + </refmeta> + <refnamediv> + <refname> + <constant>V4L2_SDR_FMT_CU8</constant> + </refname> + <refpurpose>Complex unsigned 8-bit IQ sample</refpurpose> + </refnamediv> + <refsect1> + <title>Description</title> + <para> +This format contains sequence of complex number samples. Each complex number +consist two parts, called In-phase and Quadrature (IQ). Both I and Q are +represented as a 8 bit unsigned number. I value comes first and Q value after +that. + </para> + <example> + <title><constant>V4L2_SDR_FMT_CU8</constant> 1 sample</title> + <formalpara> + <title>Byte Order.</title> + <para>Each cell is one byte. + <informaltable frame="none"> + <tgroup cols="2" align="center"> + <colspec align="left" colwidth="2*" /> + <tbody valign="top"> + <row> + <entry>start + 0:</entry> + <entry>I'<subscript>0</subscript></entry> + </row> + <row> + <entry>start + 1:</entry> + <entry>Q'<subscript>0</subscript></entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + </example> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/pixfmt-sdr-cu16le.xml b/Documentation/DocBook/media/v4l/pixfmt-sdr-cu16le.xml new file mode 100644 index 00000000000..26288ffa907 --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-sdr-cu16le.xml @@ -0,0 +1,46 @@ +<refentry id="V4L2-SDR-FMT-CU16LE"> + <refmeta> + <refentrytitle>V4L2_SDR_FMT_CU16LE ('CU16')</refentrytitle> + &manvol; + </refmeta> + <refnamediv> + <refname> + <constant>V4L2_SDR_FMT_CU16LE</constant> + </refname> + <refpurpose>Complex unsigned 16-bit little endian IQ sample</refpurpose> + </refnamediv> + <refsect1> + <title>Description</title> + <para> +This format contains sequence of complex number samples. Each complex number +consist two parts, called In-phase and Quadrature (IQ). Both I and Q are +represented as a 16 bit unsigned little endian number. I value comes first +and Q value after that. + </para> + <example> + <title><constant>V4L2_SDR_FMT_CU16LE</constant> 1 sample</title> + <formalpara> + <title>Byte Order.</title> + <para>Each cell is one byte. + <informaltable frame="none"> + <tgroup cols="3" align="center"> + <colspec align="left" colwidth="2*" /> + <tbody valign="top"> + <row> + <entry>start + 0:</entry> + <entry>I'<subscript>0[7:0]</subscript></entry> + <entry>I'<subscript>0[15:8]</subscript></entry> + </row> + <row> + <entry>start + 2:</entry> + <entry>Q'<subscript>0[7:0]</subscript></entry> + <entry>Q'<subscript>0[15:8]</subscript></entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + </example> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/pixfmt-sgbrg8.xml b/Documentation/DocBook/media/v4l/pixfmt-sgbrg8.xml new file mode 100644 index 00000000000..fee65dca79c --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-sgbrg8.xml @@ -0,0 +1,67 @@ + <refentry id="V4L2-PIX-FMT-SGBRG8"> + <refmeta> + <refentrytitle>V4L2_PIX_FMT_SGBRG8 ('GBRG')</refentrytitle> + &manvol; + </refmeta> + <refnamediv> + <refname><constant>V4L2_PIX_FMT_SGBRG8</constant></refname> + <refpurpose>Bayer RGB format</refpurpose> + </refnamediv> + <refsect1> + <title>Description</title> + + <para>This is commonly the native format of digital cameras, +reflecting the arrangement of sensors on the CCD device. Only one red, +green or blue value is given for each pixel. Missing components must +be interpolated from neighbouring pixels. From left to right the first +row consists of a green and blue value, the second row of a red and +green value. This scheme repeats to the right and down for every two +columns and rows.</para> + + <example> + <title><constant>V4L2_PIX_FMT_SGBRG8</constant> 4 × 4 +pixel image</title> + + <formalpara> + <title>Byte Order.</title> + <para>Each cell is one byte. + <informaltable frame="none"> + <tgroup cols="5" align="center"> + <colspec align="left" colwidth="2*" /> + <tbody valign="top"> + <row> + <entry>start + 0:</entry> + <entry>G<subscript>00</subscript></entry> + <entry>B<subscript>01</subscript></entry> + <entry>G<subscript>02</subscript></entry> + <entry>B<subscript>03</subscript></entry> + </row> + <row> + <entry>start + 4:</entry> + <entry>R<subscript>10</subscript></entry> + <entry>G<subscript>11</subscript></entry> + <entry>R<subscript>12</subscript></entry> + <entry>G<subscript>13</subscript></entry> + </row> + <row> + <entry>start + 8:</entry> + <entry>G<subscript>20</subscript></entry> + <entry>B<subscript>21</subscript></entry> + <entry>G<subscript>22</subscript></entry> + <entry>B<subscript>23</subscript></entry> + </row> + <row> + <entry>start + 12:</entry> + <entry>R<subscript>30</subscript></entry> + <entry>G<subscript>31</subscript></entry> + <entry>R<subscript>32</subscript></entry> + <entry>G<subscript>33</subscript></entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + </example> + </refsect1> + </refentry> diff --git a/Documentation/DocBook/media/v4l/pixfmt-sgrbg8.xml b/Documentation/DocBook/media/v4l/pixfmt-sgrbg8.xml new file mode 100644 index 00000000000..19727ab4c75 --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-sgrbg8.xml @@ -0,0 +1,67 @@ + <refentry id="V4L2-PIX-FMT-SGRBG8"> + <refmeta> + <refentrytitle>V4L2_PIX_FMT_SGRBG8 ('GRBG')</refentrytitle> + &manvol; + </refmeta> + <refnamediv> + <refname><constant>V4L2_PIX_FMT_SGRBG8</constant></refname> + <refpurpose>Bayer RGB format</refpurpose> + </refnamediv> + <refsect1> + <title>Description</title> + + <para>This is commonly the native format of digital cameras, +reflecting the arrangement of sensors on the CCD device. Only one red, +green or blue value is given for each pixel. Missing components must +be interpolated from neighbouring pixels. From left to right the first +row consists of a green and blue value, the second row of a red and +green value. This scheme repeats to the right and down for every two +columns and rows.</para> + + <example> + <title><constant>V4L2_PIX_FMT_SGRBG8</constant> 4 × +4 pixel image</title> + + <formalpara> + <title>Byte Order.</title> + <para>Each cell is one byte. + <informaltable frame="none"> + <tgroup cols="5" align="center"> + <colspec align="left" colwidth="2*" /> + <tbody valign="top"> + <row> + <entry>start + 0:</entry> + <entry>G<subscript>00</subscript></entry> + <entry>R<subscript>01</subscript></entry> + <entry>G<subscript>02</subscript></entry> + <entry>R<subscript>03</subscript></entry> + </row> + <row> + <entry>start + 4:</entry> + <entry>R<subscript>10</subscript></entry> + <entry>B<subscript>11</subscript></entry> + <entry>R<subscript>12</subscript></entry> + <entry>B<subscript>13</subscript></entry> + </row> + <row> + <entry>start + 8:</entry> + <entry>G<subscript>20</subscript></entry> + <entry>R<subscript>21</subscript></entry> + <entry>G<subscript>22</subscript></entry> + <entry>R<subscript>23</subscript></entry> + </row> + <row> + <entry>start + 12:</entry> + <entry>R<subscript>30</subscript></entry> + <entry>B<subscript>31</subscript></entry> + <entry>R<subscript>32</subscript></entry> + <entry>B<subscript>33</subscript></entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + </example> + </refsect1> + </refentry> diff --git a/Documentation/DocBook/media/v4l/pixfmt-srggb10.xml b/Documentation/DocBook/media/v4l/pixfmt-srggb10.xml new file mode 100644 index 00000000000..c1c62a9acc2 --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-srggb10.xml @@ -0,0 +1,90 @@ + <refentry id="pixfmt-srggb10"> + <refmeta> + <refentrytitle>V4L2_PIX_FMT_SRGGB10 ('RG10'), + V4L2_PIX_FMT_SGRBG10 ('BA10'), + V4L2_PIX_FMT_SGBRG10 ('GB10'), + V4L2_PIX_FMT_SBGGR10 ('BG10'), + </refentrytitle> + &manvol; + </refmeta> + <refnamediv> + <refname id="V4L2-PIX-FMT-SRGGB10"><constant>V4L2_PIX_FMT_SRGGB10</constant></refname> + <refname id="V4L2-PIX-FMT-SGRBG10"><constant>V4L2_PIX_FMT_SGRBG10</constant></refname> + <refname id="V4L2-PIX-FMT-SGBRG10"><constant>V4L2_PIX_FMT_SGBRG10</constant></refname> + <refname id="V4L2-PIX-FMT-SBGGR10"><constant>V4L2_PIX_FMT_SBGGR10</constant></refname> + <refpurpose>10-bit Bayer formats expanded to 16 bits</refpurpose> + </refnamediv> + <refsect1> + <title>Description</title> + + <para>The following four pixel formats are raw sRGB / Bayer formats with +10 bits per colour. Each colour component is stored in a 16-bit word, with 6 +unused high bits filled with zeros. Each n-pixel row contains n/2 green samples +and n/2 blue or red samples, with alternating red and blue rows. Bytes are +stored in memory in little endian order. They are conventionally described +as GRGR... BGBG..., RGRG... GBGB..., etc. Below is an example of one of these +formats</para> + + <example> + <title><constant>V4L2_PIX_FMT_SBGGR10</constant> 4 × 4 +pixel image</title> + + <formalpara> + <title>Byte Order.</title> + <para>Each cell is one byte, high 6 bits in high bytes are 0. + <informaltable frame="none"> + <tgroup cols="5" align="center"> + <colspec align="left" colwidth="2*" /> + <tbody valign="top"> + <row> + <entry>start + 0:</entry> + <entry>B<subscript>00low</subscript></entry> + <entry>B<subscript>00high</subscript></entry> + <entry>G<subscript>01low</subscript></entry> + <entry>G<subscript>01high</subscript></entry> + <entry>B<subscript>02low</subscript></entry> + <entry>B<subscript>02high</subscript></entry> + <entry>G<subscript>03low</subscript></entry> + <entry>G<subscript>03high</subscript></entry> + </row> + <row> + <entry>start + 8:</entry> + <entry>G<subscript>10low</subscript></entry> + <entry>G<subscript>10high</subscript></entry> + <entry>R<subscript>11low</subscript></entry> + <entry>R<subscript>11high</subscript></entry> + <entry>G<subscript>12low</subscript></entry> + <entry>G<subscript>12high</subscript></entry> + <entry>R<subscript>13low</subscript></entry> + <entry>R<subscript>13high</subscript></entry> + </row> + <row> + <entry>start + 16:</entry> + <entry>B<subscript>20low</subscript></entry> + <entry>B<subscript>20high</subscript></entry> + <entry>G<subscript>21low</subscript></entry> + <entry>G<subscript>21high</subscript></entry> + <entry>B<subscript>22low</subscript></entry> + <entry>B<subscript>22high</subscript></entry> + <entry>G<subscript>23low</subscript></entry> + <entry>G<subscript>23high</subscript></entry> + </row> + <row> + <entry>start + 24:</entry> + <entry>G<subscript>30low</subscript></entry> + <entry>G<subscript>30high</subscript></entry> + <entry>R<subscript>31low</subscript></entry> + <entry>R<subscript>31high</subscript></entry> + <entry>G<subscript>32low</subscript></entry> + <entry>G<subscript>32high</subscript></entry> + <entry>R<subscript>33low</subscript></entry> + <entry>R<subscript>33high</subscript></entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + </example> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/pixfmt-srggb10alaw8.xml b/Documentation/DocBook/media/v4l/pixfmt-srggb10alaw8.xml new file mode 100644 index 00000000000..29acc2098cc --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-srggb10alaw8.xml @@ -0,0 +1,34 @@ + <refentry> + <refmeta> + <refentrytitle> + V4L2_PIX_FMT_SBGGR10ALAW8 ('aBA8'), + V4L2_PIX_FMT_SGBRG10ALAW8 ('aGA8'), + V4L2_PIX_FMT_SGRBG10ALAW8 ('agA8'), + V4L2_PIX_FMT_SRGGB10ALAW8 ('aRA8'), + </refentrytitle> + &manvol; + </refmeta> + <refnamediv> + <refname id="V4L2-PIX-FMT-SBGGR10ALAW8"> + <constant>V4L2_PIX_FMT_SBGGR10ALAW8</constant> + </refname> + <refname id="V4L2-PIX-FMT-SGBRG10ALAW8"> + <constant>V4L2_PIX_FMT_SGBRG10ALAW8</constant> + </refname> + <refname id="V4L2-PIX-FMT-SGRBG10ALAW8"> + <constant>V4L2_PIX_FMT_SGRBG10ALAW8</constant> + </refname> + <refname id="V4L2-PIX-FMT-SRGGB10ALAW8"> + <constant>V4L2_PIX_FMT_SRGGB10ALAW8</constant> + </refname> + <refpurpose>10-bit Bayer formats compressed to 8 bits</refpurpose> + </refnamediv> + <refsect1> + <title>Description</title> + <para>The following four pixel formats are raw sRGB / Bayer + formats with 10 bits per color compressed to 8 bits each, + using the A-LAW algorithm. Each color component consumes 8 + bits of memory. In other respects this format is similar to + <xref linkend="V4L2-PIX-FMT-SRGGB8"></xref>.</para> + </refsect1> + </refentry> diff --git a/Documentation/DocBook/media/v4l/pixfmt-srggb10dpcm8.xml b/Documentation/DocBook/media/v4l/pixfmt-srggb10dpcm8.xml new file mode 100644 index 00000000000..2d3f0b1aefe --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-srggb10dpcm8.xml @@ -0,0 +1,28 @@ + <refentry id="pixfmt-srggb10dpcm8"> + <refmeta> + <refentrytitle> + V4L2_PIX_FMT_SBGGR10DPCM8 ('bBA8'), + V4L2_PIX_FMT_SGBRG10DPCM8 ('bGA8'), + V4L2_PIX_FMT_SGRBG10DPCM8 ('BD10'), + V4L2_PIX_FMT_SRGGB10DPCM8 ('bRA8'), + </refentrytitle> + &manvol; + </refmeta> + <refnamediv> + <refname id="V4L2-PIX-FMT-SBGGR10DPCM8"><constant>V4L2_PIX_FMT_SBGGR10DPCM8</constant></refname> + <refname id="V4L2-PIX-FMT-SGBRG10DPCM8"><constant>V4L2_PIX_FMT_SGBRG10DPCM8</constant></refname> + <refname id="V4L2-PIX-FMT-SGRBG10DPCM8"><constant>V4L2_PIX_FMT_SGRBG10DPCM8</constant></refname> + <refname id="V4L2-PIX-FMT-SRGGB10DPCM8"><constant>V4L2_PIX_FMT_SRGGB10DPCM8</constant></refname> + <refpurpose>10-bit Bayer formats compressed to 8 bits</refpurpose> + </refnamediv> + <refsect1> + <title>Description</title> + + <para>The following four pixel formats are raw sRGB / Bayer formats + with 10 bits per colour compressed to 8 bits each, using DPCM + compression. DPCM, differential pulse-code modulation, is lossy. + Each colour component consumes 8 bits of memory. In other respects + this format is similar to <xref linkend="pixfmt-srggb10" />.</para> + + </refsect1> + </refentry> diff --git a/Documentation/DocBook/media/v4l/pixfmt-srggb12.xml b/Documentation/DocBook/media/v4l/pixfmt-srggb12.xml new file mode 100644 index 00000000000..9ba4fb690bc --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-srggb12.xml @@ -0,0 +1,90 @@ + <refentry> + <refmeta> + <refentrytitle>V4L2_PIX_FMT_SRGGB12 ('RG12'), + V4L2_PIX_FMT_SGRBG12 ('BA12'), + V4L2_PIX_FMT_SGBRG12 ('GB12'), + V4L2_PIX_FMT_SBGGR12 ('BG12'), + </refentrytitle> + &manvol; + </refmeta> + <refnamediv> + <refname id="V4L2-PIX-FMT-SRGGB12"><constant>V4L2_PIX_FMT_SRGGB12</constant></refname> + <refname id="V4L2-PIX-FMT-SGRBG12"><constant>V4L2_PIX_FMT_SGRBG12</constant></refname> + <refname id="V4L2-PIX-FMT-SGBRG12"><constant>V4L2_PIX_FMT_SGBRG12</constant></refname> + <refname id="V4L2-PIX-FMT-SBGGR12"><constant>V4L2_PIX_FMT_SBGGR12</constant></refname> + <refpurpose>12-bit Bayer formats expanded to 16 bits</refpurpose> + </refnamediv> + <refsect1> + <title>Description</title> + + <para>The following four pixel formats are raw sRGB / Bayer formats with +12 bits per colour. Each colour component is stored in a 16-bit word, with 6 +unused high bits filled with zeros. Each n-pixel row contains n/2 green samples +and n/2 blue or red samples, with alternating red and blue rows. Bytes are +stored in memory in little endian order. They are conventionally described +as GRGR... BGBG..., RGRG... GBGB..., etc. Below is an example of one of these +formats</para> + + <example> + <title><constant>V4L2_PIX_FMT_SBGGR12</constant> 4 × 4 +pixel image</title> + + <formalpara> + <title>Byte Order.</title> + <para>Each cell is one byte, high 6 bits in high bytes are 0. + <informaltable frame="none"> + <tgroup cols="5" align="center"> + <colspec align="left" colwidth="2*" /> + <tbody valign="top"> + <row> + <entry>start + 0:</entry> + <entry>B<subscript>00low</subscript></entry> + <entry>B<subscript>00high</subscript></entry> + <entry>G<subscript>01low</subscript></entry> + <entry>G<subscript>01high</subscript></entry> + <entry>B<subscript>02low</subscript></entry> + <entry>B<subscript>02high</subscript></entry> + <entry>G<subscript>03low</subscript></entry> + <entry>G<subscript>03high</subscript></entry> + </row> + <row> + <entry>start + 8:</entry> + <entry>G<subscript>10low</subscript></entry> + <entry>G<subscript>10high</subscript></entry> + <entry>R<subscript>11low</subscript></entry> + <entry>R<subscript>11high</subscript></entry> + <entry>G<subscript>12low</subscript></entry> + <entry>G<subscript>12high</subscript></entry> + <entry>R<subscript>13low</subscript></entry> + <entry>R<subscript>13high</subscript></entry> + </row> + <row> + <entry>start + 16:</entry> + <entry>B<subscript>20low</subscript></entry> + <entry>B<subscript>20high</subscript></entry> + <entry>G<subscript>21low</subscript></entry> + <entry>G<subscript>21high</subscript></entry> + <entry>B<subscript>22low</subscript></entry> + <entry>B<subscript>22high</subscript></entry> + <entry>G<subscript>23low</subscript></entry> + <entry>G<subscript>23high</subscript></entry> + </row> + <row> + <entry>start + 24:</entry> + <entry>G<subscript>30low</subscript></entry> + <entry>G<subscript>30high</subscript></entry> + <entry>R<subscript>31low</subscript></entry> + <entry>R<subscript>31high</subscript></entry> + <entry>G<subscript>32low</subscript></entry> + <entry>G<subscript>32high</subscript></entry> + <entry>R<subscript>33low</subscript></entry> + <entry>R<subscript>33high</subscript></entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + </example> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/pixfmt-srggb8.xml b/Documentation/DocBook/media/v4l/pixfmt-srggb8.xml new file mode 100644 index 00000000000..2570e3be3cf --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-srggb8.xml @@ -0,0 +1,67 @@ + <refentry id="V4L2-PIX-FMT-SRGGB8"> + <refmeta> + <refentrytitle>V4L2_PIX_FMT_SRGGB8 ('RGGB')</refentrytitle> + &manvol; + </refmeta> + <refnamediv> + <refname><constant>V4L2_PIX_FMT_SRGGB8</constant></refname> + <refpurpose>Bayer RGB format</refpurpose> + </refnamediv> + <refsect1> + <title>Description</title> + + <para>This is commonly the native format of digital cameras, +reflecting the arrangement of sensors on the CCD device. Only one red, +green or blue value is given for each pixel. Missing components must +be interpolated from neighbouring pixels. From left to right the first +row consists of a red and green value, the second row of a green and +blue value. This scheme repeats to the right and down for every two +columns and rows.</para> + + <example> + <title><constant>V4L2_PIX_FMT_SRGGB8</constant> 4 × 4 +pixel image</title> + + <formalpara> + <title>Byte Order.</title> + <para>Each cell is one byte. + <informaltable frame="none"> + <tgroup cols="5" align="center"> + <colspec align="left" colwidth="2*" /> + <tbody valign="top"> + <row> + <entry>start + 0:</entry> + <entry>R<subscript>00</subscript></entry> + <entry>G<subscript>01</subscript></entry> + <entry>R<subscript>02</subscript></entry> + <entry>G<subscript>03</subscript></entry> + </row> + <row> + <entry>start + 4:</entry> + <entry>G<subscript>10</subscript></entry> + <entry>B<subscript>11</subscript></entry> + <entry>G<subscript>12</subscript></entry> + <entry>B<subscript>13</subscript></entry> + </row> + <row> + <entry>start + 8:</entry> + <entry>R<subscript>20</subscript></entry> + <entry>G<subscript>21</subscript></entry> + <entry>R<subscript>22</subscript></entry> + <entry>G<subscript>23</subscript></entry> + </row> + <row> + <entry>start + 12:</entry> + <entry>G<subscript>30</subscript></entry> + <entry>B<subscript>31</subscript></entry> + <entry>G<subscript>32</subscript></entry> + <entry>B<subscript>33</subscript></entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + </example> + </refsect1> + </refentry> diff --git a/Documentation/DocBook/media/v4l/pixfmt-uv8.xml b/Documentation/DocBook/media/v4l/pixfmt-uv8.xml new file mode 100644 index 00000000000..c507c1f73cd --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-uv8.xml @@ -0,0 +1,62 @@ + <refentry id="V4L2-PIX-FMT-UV8"> + <refmeta> + <refentrytitle>V4L2_PIX_FMT_UV8 ('UV8')</refentrytitle> + &manvol; + </refmeta> + <refnamediv> + <refname><constant>V4L2_PIX_FMT_UV8</constant></refname> + <refpurpose>UV plane interleaved</refpurpose> + </refnamediv> + <refsect1> + <title>Description</title> + <para>In this format there is no Y plane, Only CbCr plane. ie + (UV interleaved)</para> + <example> + <title> + <constant>V4L2_PIX_FMT_UV8</constant> + pixel image + </title> + + <formalpara> + <title>Byte Order.</title> + <para>Each cell is one byte. + <informaltable frame="none"> + <tgroup cols="5" align="center"> + <colspec align="left" colwidth="2*" /> + <tbody valign="top"> + <row> + <entry>start + 0:</entry> + <entry>Cb<subscript>00</subscript></entry> + <entry>Cr<subscript>00</subscript></entry> + <entry>Cb<subscript>01</subscript></entry> + <entry>Cr<subscript>01</subscript></entry> + </row> + <row> + <entry>start + 4:</entry> + <entry>Cb<subscript>10</subscript></entry> + <entry>Cr<subscript>10</subscript></entry> + <entry>Cb<subscript>11</subscript></entry> + <entry>Cr<subscript>11</subscript></entry> + </row> + <row> + <entry>start + 8:</entry> + <entry>Cb<subscript>20</subscript></entry> + <entry>Cr<subscript>20</subscript></entry> + <entry>Cb<subscript>21</subscript></entry> + <entry>Cr<subscript>21</subscript></entry> + </row> + <row> + <entry>start + 12:</entry> + <entry>Cb<subscript>30</subscript></entry> + <entry>Cr<subscript>30</subscript></entry> + <entry>Cb<subscript>31</subscript></entry> + <entry>Cr<subscript>31</subscript></entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + </example> + </refsect1> + </refentry> diff --git a/Documentation/DocBook/media/v4l/pixfmt-uyvy.xml b/Documentation/DocBook/media/v4l/pixfmt-uyvy.xml new file mode 100644 index 00000000000..b1f6801a17f --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-uyvy.xml @@ -0,0 +1,120 @@ + <refentry id="V4L2-PIX-FMT-UYVY"> + <refmeta> + <refentrytitle>V4L2_PIX_FMT_UYVY ('UYVY')</refentrytitle> + &manvol; + </refmeta> + <refnamediv> + <refname><constant>V4L2_PIX_FMT_UYVY</constant></refname> + <refpurpose>Variation of +<constant>V4L2_PIX_FMT_YUYV</constant> with different order of samples +in memory</refpurpose> + </refnamediv> + <refsect1> + <title>Description</title> + + <para>In this format each four bytes is two pixels. Each four +bytes is two Y's, a Cb and a Cr. Each Y goes to one of the pixels, and +the Cb and Cr belong to both pixels. As you can see, the Cr and Cb +components have half the horizontal resolution of the Y +component.</para> + + <example> + <title><constant>V4L2_PIX_FMT_UYVY</constant> 4 × 4 +pixel image</title> + + <formalpara> + <title>Byte Order.</title> + <para>Each cell is one byte. + <informaltable frame="none"> + <tgroup cols="9" align="center"> + <colspec align="left" colwidth="2*" /> + <tbody valign="top"> + <row> + <entry>start + 0:</entry> + <entry>Cb<subscript>00</subscript></entry> + <entry>Y'<subscript>00</subscript></entry> + <entry>Cr<subscript>00</subscript></entry> + <entry>Y'<subscript>01</subscript></entry> + <entry>Cb<subscript>01</subscript></entry> + <entry>Y'<subscript>02</subscript></entry> + <entry>Cr<subscript>01</subscript></entry> + <entry>Y'<subscript>03</subscript></entry> + </row> + <row> + <entry>start + 8:</entry> + <entry>Cb<subscript>10</subscript></entry> + <entry>Y'<subscript>10</subscript></entry> + <entry>Cr<subscript>10</subscript></entry> + <entry>Y'<subscript>11</subscript></entry> + <entry>Cb<subscript>11</subscript></entry> + <entry>Y'<subscript>12</subscript></entry> + <entry>Cr<subscript>11</subscript></entry> + <entry>Y'<subscript>13</subscript></entry> + </row> + <row> + <entry>start + 16:</entry> + <entry>Cb<subscript>20</subscript></entry> + <entry>Y'<subscript>20</subscript></entry> + <entry>Cr<subscript>20</subscript></entry> + <entry>Y'<subscript>21</subscript></entry> + <entry>Cb<subscript>21</subscript></entry> + <entry>Y'<subscript>22</subscript></entry> + <entry>Cr<subscript>21</subscript></entry> + <entry>Y'<subscript>23</subscript></entry> + </row> + <row> + <entry>start + 24:</entry> + <entry>Cb<subscript>30</subscript></entry> + <entry>Y'<subscript>30</subscript></entry> + <entry>Cr<subscript>30</subscript></entry> + <entry>Y'<subscript>31</subscript></entry> + <entry>Cb<subscript>31</subscript></entry> + <entry>Y'<subscript>32</subscript></entry> + <entry>Cr<subscript>31</subscript></entry> + <entry>Y'<subscript>33</subscript></entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + + <formalpara> + <title>Color Sample Location.</title> + <para> + <informaltable frame="none"> + <tgroup cols="7" align="center"> + <tbody valign="top"> + <row> + <entry></entry> + <entry>0</entry><entry></entry><entry>1</entry><entry></entry> + <entry>2</entry><entry></entry><entry>3</entry> + </row> + <row> + <entry>0</entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry> + </row> + <row> + <entry>1</entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry> + </row> + <row> + <entry>2</entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry> + </row> + <row> + <entry>3</entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + </example> + </refsect1> + </refentry> diff --git a/Documentation/DocBook/media/v4l/pixfmt-vyuy.xml b/Documentation/DocBook/media/v4l/pixfmt-vyuy.xml new file mode 100644 index 00000000000..82803408b38 --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-vyuy.xml @@ -0,0 +1,120 @@ + <refentry id="V4L2-PIX-FMT-VYUY"> + <refmeta> + <refentrytitle>V4L2_PIX_FMT_VYUY ('VYUY')</refentrytitle> + &manvol; + </refmeta> + <refnamediv> + <refname><constant>V4L2_PIX_FMT_VYUY</constant></refname> + <refpurpose>Variation of +<constant>V4L2_PIX_FMT_YUYV</constant> with different order of samples +in memory</refpurpose> + </refnamediv> + <refsect1> + <title>Description</title> + + <para>In this format each four bytes is two pixels. Each four +bytes is two Y's, a Cb and a Cr. Each Y goes to one of the pixels, and +the Cb and Cr belong to both pixels. As you can see, the Cr and Cb +components have half the horizontal resolution of the Y +component.</para> + + <example> + <title><constant>V4L2_PIX_FMT_VYUY</constant> 4 × 4 +pixel image</title> + + <formalpara> + <title>Byte Order.</title> + <para>Each cell is one byte. + <informaltable frame="none"> + <tgroup cols="9" align="center"> + <colspec align="left" colwidth="2*" /> + <tbody valign="top"> + <row> + <entry>start + 0:</entry> + <entry>Cr<subscript>00</subscript></entry> + <entry>Y'<subscript>00</subscript></entry> + <entry>Cb<subscript>00</subscript></entry> + <entry>Y'<subscript>01</subscript></entry> + <entry>Cr<subscript>01</subscript></entry> + <entry>Y'<subscript>02</subscript></entry> + <entry>Cb<subscript>01</subscript></entry> + <entry>Y'<subscript>03</subscript></entry> + </row> + <row> + <entry>start + 8:</entry> + <entry>Cr<subscript>10</subscript></entry> + <entry>Y'<subscript>10</subscript></entry> + <entry>Cb<subscript>10</subscript></entry> + <entry>Y'<subscript>11</subscript></entry> + <entry>Cr<subscript>11</subscript></entry> + <entry>Y'<subscript>12</subscript></entry> + <entry>Cb<subscript>11</subscript></entry> + <entry>Y'<subscript>13</subscript></entry> + </row> + <row> + <entry>start + 16:</entry> + <entry>Cr<subscript>20</subscript></entry> + <entry>Y'<subscript>20</subscript></entry> + <entry>Cb<subscript>20</subscript></entry> + <entry>Y'<subscript>21</subscript></entry> + <entry>Cr<subscript>21</subscript></entry> + <entry>Y'<subscript>22</subscript></entry> + <entry>Cb<subscript>21</subscript></entry> + <entry>Y'<subscript>23</subscript></entry> + </row> + <row> + <entry>start + 24:</entry> + <entry>Cr<subscript>30</subscript></entry> + <entry>Y'<subscript>30</subscript></entry> + <entry>Cb<subscript>30</subscript></entry> + <entry>Y'<subscript>31</subscript></entry> + <entry>Cr<subscript>31</subscript></entry> + <entry>Y'<subscript>32</subscript></entry> + <entry>Cb<subscript>31</subscript></entry> + <entry>Y'<subscript>33</subscript></entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + + <formalpara> + <title>Color Sample Location.</title> + <para> + <informaltable frame="none"> + <tgroup cols="7" align="center"> + <tbody valign="top"> + <row> + <entry></entry> + <entry>0</entry><entry></entry><entry>1</entry><entry></entry> + <entry>2</entry><entry></entry><entry>3</entry> + </row> + <row> + <entry>0</entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry> + </row> + <row> + <entry>1</entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry> + </row> + <row> + <entry>2</entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry> + </row> + <row> + <entry>3</entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + </example> + </refsect1> + </refentry> diff --git a/Documentation/DocBook/media/v4l/pixfmt-y10.xml b/Documentation/DocBook/media/v4l/pixfmt-y10.xml new file mode 100644 index 00000000000..d065043db8d --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-y10.xml @@ -0,0 +1,79 @@ +<refentry id="V4L2-PIX-FMT-Y10"> + <refmeta> + <refentrytitle>V4L2_PIX_FMT_Y10 ('Y10 ')</refentrytitle> + &manvol; + </refmeta> + <refnamediv> + <refname><constant>V4L2_PIX_FMT_Y10</constant></refname> + <refpurpose>Grey-scale image</refpurpose> + </refnamediv> + <refsect1> + <title>Description</title> + + <para>This is a grey-scale image with a depth of 10 bits per pixel. Pixels +are stored in 16-bit words with unused high bits padded with 0. The least +significant byte is stored at lower memory addresses (little-endian).</para> + + <example> + <title><constant>V4L2_PIX_FMT_Y10</constant> 4 × 4 +pixel image</title> + + <formalpara> + <title>Byte Order.</title> + <para>Each cell is one byte. + <informaltable frame="none"> + <tgroup cols="9" align="center"> + <colspec align="left" colwidth="2*" /> + <tbody valign="top"> + <row> + <entry>start + 0:</entry> + <entry>Y'<subscript>00low</subscript></entry> + <entry>Y'<subscript>00high</subscript></entry> + <entry>Y'<subscript>01low</subscript></entry> + <entry>Y'<subscript>01high</subscript></entry> + <entry>Y'<subscript>02low</subscript></entry> + <entry>Y'<subscript>02high</subscript></entry> + <entry>Y'<subscript>03low</subscript></entry> + <entry>Y'<subscript>03high</subscript></entry> + </row> + <row> + <entry>start + 8:</entry> + <entry>Y'<subscript>10low</subscript></entry> + <entry>Y'<subscript>10high</subscript></entry> + <entry>Y'<subscript>11low</subscript></entry> + <entry>Y'<subscript>11high</subscript></entry> + <entry>Y'<subscript>12low</subscript></entry> + <entry>Y'<subscript>12high</subscript></entry> + <entry>Y'<subscript>13low</subscript></entry> + <entry>Y'<subscript>13high</subscript></entry> + </row> + <row> + <entry>start + 16:</entry> + <entry>Y'<subscript>20low</subscript></entry> + <entry>Y'<subscript>20high</subscript></entry> + <entry>Y'<subscript>21low</subscript></entry> + <entry>Y'<subscript>21high</subscript></entry> + <entry>Y'<subscript>22low</subscript></entry> + <entry>Y'<subscript>22high</subscript></entry> + <entry>Y'<subscript>23low</subscript></entry> + <entry>Y'<subscript>23high</subscript></entry> + </row> + <row> + <entry>start + 24:</entry> + <entry>Y'<subscript>30low</subscript></entry> + <entry>Y'<subscript>30high</subscript></entry> + <entry>Y'<subscript>31low</subscript></entry> + <entry>Y'<subscript>31high</subscript></entry> + <entry>Y'<subscript>32low</subscript></entry> + <entry>Y'<subscript>32high</subscript></entry> + <entry>Y'<subscript>33low</subscript></entry> + <entry>Y'<subscript>33high</subscript></entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + </example> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/pixfmt-y10b.xml b/Documentation/DocBook/media/v4l/pixfmt-y10b.xml new file mode 100644 index 00000000000..adb0ad808c9 --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-y10b.xml @@ -0,0 +1,43 @@ +<refentry id="V4L2-PIX-FMT-Y10BPACK"> + <refmeta> + <refentrytitle>V4L2_PIX_FMT_Y10BPACK ('Y10B')</refentrytitle> + &manvol; + </refmeta> + <refnamediv> + <refname><constant>V4L2_PIX_FMT_Y10BPACK</constant></refname> + <refpurpose>Grey-scale image as a bit-packed array</refpurpose> + </refnamediv> + <refsect1> + <title>Description</title> + + <para>This is a packed grey-scale image format with a depth of 10 bits per + pixel. Pixels are stored in a bit-packed array of 10bit bits per pixel, + with no padding between them and with the most significant bits coming + first from the left.</para> + + <example> + <title><constant>V4L2_PIX_FMT_Y10BPACK</constant> 4 pixel data stream taking 5 bytes</title> + + <formalpara> + <title>Bit-packed representation</title> + <para>pixels cross the byte boundary and have a ratio of 5 bytes for each 4 + pixels. + <informaltable frame="all"> + <tgroup cols="5" align="center"> + <colspec align="left" colwidth="2*" /> + <tbody valign="top"> + <row> + <entry>Y'<subscript>00[9:2]</subscript></entry> + <entry>Y'<subscript>00[1:0]</subscript>Y'<subscript>01[9:4]</subscript></entry> + <entry>Y'<subscript>01[3:0]</subscript>Y'<subscript>02[9:6]</subscript></entry> + <entry>Y'<subscript>02[5:0]</subscript>Y'<subscript>03[9:8]</subscript></entry> + <entry>Y'<subscript>03[7:0]</subscript></entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + </example> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/pixfmt-y12.xml b/Documentation/DocBook/media/v4l/pixfmt-y12.xml new file mode 100644 index 00000000000..ff417b858cc --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-y12.xml @@ -0,0 +1,79 @@ +<refentry id="V4L2-PIX-FMT-Y12"> + <refmeta> + <refentrytitle>V4L2_PIX_FMT_Y12 ('Y12 ')</refentrytitle> + &manvol; + </refmeta> + <refnamediv> + <refname><constant>V4L2_PIX_FMT_Y12</constant></refname> + <refpurpose>Grey-scale image</refpurpose> + </refnamediv> + <refsect1> + <title>Description</title> + + <para>This is a grey-scale image with a depth of 12 bits per pixel. Pixels +are stored in 16-bit words with unused high bits padded with 0. The least +significant byte is stored at lower memory addresses (little-endian).</para> + + <example> + <title><constant>V4L2_PIX_FMT_Y12</constant> 4 × 4 +pixel image</title> + + <formalpara> + <title>Byte Order.</title> + <para>Each cell is one byte. + <informaltable frame="none"> + <tgroup cols="9" align="center"> + <colspec align="left" colwidth="2*" /> + <tbody valign="top"> + <row> + <entry>start + 0:</entry> + <entry>Y'<subscript>00low</subscript></entry> + <entry>Y'<subscript>00high</subscript></entry> + <entry>Y'<subscript>01low</subscript></entry> + <entry>Y'<subscript>01high</subscript></entry> + <entry>Y'<subscript>02low</subscript></entry> + <entry>Y'<subscript>02high</subscript></entry> + <entry>Y'<subscript>03low</subscript></entry> + <entry>Y'<subscript>03high</subscript></entry> + </row> + <row> + <entry>start + 8:</entry> + <entry>Y'<subscript>10low</subscript></entry> + <entry>Y'<subscript>10high</subscript></entry> + <entry>Y'<subscript>11low</subscript></entry> + <entry>Y'<subscript>11high</subscript></entry> + <entry>Y'<subscript>12low</subscript></entry> + <entry>Y'<subscript>12high</subscript></entry> + <entry>Y'<subscript>13low</subscript></entry> + <entry>Y'<subscript>13high</subscript></entry> + </row> + <row> + <entry>start + 16:</entry> + <entry>Y'<subscript>20low</subscript></entry> + <entry>Y'<subscript>20high</subscript></entry> + <entry>Y'<subscript>21low</subscript></entry> + <entry>Y'<subscript>21high</subscript></entry> + <entry>Y'<subscript>22low</subscript></entry> + <entry>Y'<subscript>22high</subscript></entry> + <entry>Y'<subscript>23low</subscript></entry> + <entry>Y'<subscript>23high</subscript></entry> + </row> + <row> + <entry>start + 24:</entry> + <entry>Y'<subscript>30low</subscript></entry> + <entry>Y'<subscript>30high</subscript></entry> + <entry>Y'<subscript>31low</subscript></entry> + <entry>Y'<subscript>31high</subscript></entry> + <entry>Y'<subscript>32low</subscript></entry> + <entry>Y'<subscript>32high</subscript></entry> + <entry>Y'<subscript>33low</subscript></entry> + <entry>Y'<subscript>33high</subscript></entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + </example> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/pixfmt-y16.xml b/Documentation/DocBook/media/v4l/pixfmt-y16.xml new file mode 100644 index 00000000000..ff4f727d562 --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-y16.xml @@ -0,0 +1,81 @@ +<refentry id="V4L2-PIX-FMT-Y16"> + <refmeta> + <refentrytitle>V4L2_PIX_FMT_Y16 ('Y16 ')</refentrytitle> + &manvol; + </refmeta> + <refnamediv> + <refname><constant>V4L2_PIX_FMT_Y16</constant></refname> + <refpurpose>Grey-scale image</refpurpose> + </refnamediv> + <refsect1> + <title>Description</title> + + <para>This is a grey-scale image with a depth of 16 bits per +pixel. The least significant byte is stored at lower memory addresses +(little-endian). Note the actual sampling precision may be lower than +16 bits, for example 10 bits per pixel with values in range 0 to +1023.</para> + + <example> + <title><constant>V4L2_PIX_FMT_Y16</constant> 4 × 4 +pixel image</title> + + <formalpara> + <title>Byte Order.</title> + <para>Each cell is one byte. + <informaltable frame="none"> + <tgroup cols="9" align="center"> + <colspec align="left" colwidth="2*" /> + <tbody valign="top"> + <row> + <entry>start + 0:</entry> + <entry>Y'<subscript>00low</subscript></entry> + <entry>Y'<subscript>00high</subscript></entry> + <entry>Y'<subscript>01low</subscript></entry> + <entry>Y'<subscript>01high</subscript></entry> + <entry>Y'<subscript>02low</subscript></entry> + <entry>Y'<subscript>02high</subscript></entry> + <entry>Y'<subscript>03low</subscript></entry> + <entry>Y'<subscript>03high</subscript></entry> + </row> + <row> + <entry>start + 8:</entry> + <entry>Y'<subscript>10low</subscript></entry> + <entry>Y'<subscript>10high</subscript></entry> + <entry>Y'<subscript>11low</subscript></entry> + <entry>Y'<subscript>11high</subscript></entry> + <entry>Y'<subscript>12low</subscript></entry> + <entry>Y'<subscript>12high</subscript></entry> + <entry>Y'<subscript>13low</subscript></entry> + <entry>Y'<subscript>13high</subscript></entry> + </row> + <row> + <entry>start + 16:</entry> + <entry>Y'<subscript>20low</subscript></entry> + <entry>Y'<subscript>20high</subscript></entry> + <entry>Y'<subscript>21low</subscript></entry> + <entry>Y'<subscript>21high</subscript></entry> + <entry>Y'<subscript>22low</subscript></entry> + <entry>Y'<subscript>22high</subscript></entry> + <entry>Y'<subscript>23low</subscript></entry> + <entry>Y'<subscript>23high</subscript></entry> + </row> + <row> + <entry>start + 24:</entry> + <entry>Y'<subscript>30low</subscript></entry> + <entry>Y'<subscript>30high</subscript></entry> + <entry>Y'<subscript>31low</subscript></entry> + <entry>Y'<subscript>31high</subscript></entry> + <entry>Y'<subscript>32low</subscript></entry> + <entry>Y'<subscript>32high</subscript></entry> + <entry>Y'<subscript>33low</subscript></entry> + <entry>Y'<subscript>33high</subscript></entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + </example> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/pixfmt-y41p.xml b/Documentation/DocBook/media/v4l/pixfmt-y41p.xml new file mode 100644 index 00000000000..98dcb91d291 --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-y41p.xml @@ -0,0 +1,149 @@ + <refentry id="V4L2-PIX-FMT-Y41P"> + <refmeta> + <refentrytitle>V4L2_PIX_FMT_Y41P ('Y41P')</refentrytitle> + &manvol; + </refmeta> + <refnamediv> + <refname><constant>V4L2_PIX_FMT_Y41P</constant></refname> + <refpurpose>Format with ¼ horizontal chroma +resolution, also known as YUV 4:1:1</refpurpose> + </refnamediv> + <refsect1> + <title>Description</title> + + <para>In this format each 12 bytes is eight pixels. In the +twelve bytes are two CbCr pairs and eight Y's. The first CbCr pair +goes with the first four Y's, and the second CbCr pair goes with the +other four Y's. The Cb and Cr components have one fourth the +horizontal resolution of the Y component.</para> + + <para>Do not confuse this format with <link +linkend="V4L2-PIX-FMT-YUV411P"><constant>V4L2_PIX_FMT_YUV411P</constant></link>. +Y41P is derived from "YUV 4:1:1 <emphasis>packed</emphasis>", while +YUV411P stands for "YUV 4:1:1 <emphasis>planar</emphasis>".</para> + + <example> + <title><constant>V4L2_PIX_FMT_Y41P</constant> 8 × 4 +pixel image</title> + + <formalpara> + <title>Byte Order</title> + <para>Each cell is one byte. + <informaltable frame="none"> + <tgroup cols="13" align="center"> + <colspec align="left" colwidth="2*" /> + <tbody valign="top"> + <row> + <entry>start + 0:</entry> + <entry>Cb<subscript>00</subscript></entry> + <entry>Y'<subscript>00</subscript></entry> + <entry>Cr<subscript>00</subscript></entry> + <entry>Y'<subscript>01</subscript></entry> + <entry>Cb<subscript>01</subscript></entry> + <entry>Y'<subscript>02</subscript></entry> + <entry>Cr<subscript>01</subscript></entry> + <entry>Y'<subscript>03</subscript></entry> + <entry>Y'<subscript>04</subscript></entry> + <entry>Y'<subscript>05</subscript></entry> + <entry>Y'<subscript>06</subscript></entry> + <entry>Y'<subscript>07</subscript></entry> + </row> + <row> + <entry>start + 12:</entry> + <entry>Cb<subscript>10</subscript></entry> + <entry>Y'<subscript>10</subscript></entry> + <entry>Cr<subscript>10</subscript></entry> + <entry>Y'<subscript>11</subscript></entry> + <entry>Cb<subscript>11</subscript></entry> + <entry>Y'<subscript>12</subscript></entry> + <entry>Cr<subscript>11</subscript></entry> + <entry>Y'<subscript>13</subscript></entry> + <entry>Y'<subscript>14</subscript></entry> + <entry>Y'<subscript>15</subscript></entry> + <entry>Y'<subscript>16</subscript></entry> + <entry>Y'<subscript>17</subscript></entry> + </row> + <row> + <entry>start + 24:</entry> + <entry>Cb<subscript>20</subscript></entry> + <entry>Y'<subscript>20</subscript></entry> + <entry>Cr<subscript>20</subscript></entry> + <entry>Y'<subscript>21</subscript></entry> + <entry>Cb<subscript>21</subscript></entry> + <entry>Y'<subscript>22</subscript></entry> + <entry>Cr<subscript>21</subscript></entry> + <entry>Y'<subscript>23</subscript></entry> + <entry>Y'<subscript>24</subscript></entry> + <entry>Y'<subscript>25</subscript></entry> + <entry>Y'<subscript>26</subscript></entry> + <entry>Y'<subscript>27</subscript></entry> + </row> + <row> + <entry>start + 36:</entry> + <entry>Cb<subscript>30</subscript></entry> + <entry>Y'<subscript>30</subscript></entry> + <entry>Cr<subscript>30</subscript></entry> + <entry>Y'<subscript>31</subscript></entry> + <entry>Cb<subscript>31</subscript></entry> + <entry>Y'<subscript>32</subscript></entry> + <entry>Cr<subscript>31</subscript></entry> + <entry>Y'<subscript>33</subscript></entry> + <entry>Y'<subscript>34</subscript></entry> + <entry>Y'<subscript>35</subscript></entry> + <entry>Y'<subscript>36</subscript></entry> + <entry>Y'<subscript>37</subscript></entry> + </row> + </tbody> + </tgroup> + </informaltable></para> + </formalpara> + + <formalpara> + <title>Color Sample Location.</title> + <para> + <informaltable frame="none"> + <tgroup cols="15" align="center"> + <tbody valign="top"> + <row> + <entry></entry> + <entry>0</entry><entry></entry><entry>1</entry><entry></entry> + <entry>2</entry><entry></entry><entry>3</entry><entry></entry> + <entry>4</entry><entry></entry><entry>5</entry><entry></entry> + <entry>6</entry><entry></entry><entry>7</entry> + </row> + <row> + <entry>0</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + <row> + <entry>1</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + <row> + <entry>2</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + <row> + <entry>3</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + </example> + </refsect1> + </refentry> diff --git a/Documentation/DocBook/media/v4l/pixfmt-yuv410.xml b/Documentation/DocBook/media/v4l/pixfmt-yuv410.xml new file mode 100644 index 00000000000..0869dce5f92 --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-yuv410.xml @@ -0,0 +1,133 @@ + <refentry> + <refmeta> + <refentrytitle>V4L2_PIX_FMT_YVU410 ('YVU9'), V4L2_PIX_FMT_YUV410 ('YUV9')</refentrytitle> + &manvol; + </refmeta> + <refnamediv> + <refname id="V4L2-PIX-FMT-YVU410"><constant>V4L2_PIX_FMT_YVU410</constant></refname> + <refname id="V4L2-PIX-FMT-YUV410"><constant>V4L2_PIX_FMT_YUV410</constant></refname> + <refpurpose>Planar formats with ¼ horizontal and +vertical chroma resolution, also known as YUV 4:1:0</refpurpose> + </refnamediv> + <refsect1> + <title>Description</title> + + <para>These are planar formats, as opposed to a packed format. +The three components are separated into three sub-images or planes. +The Y plane is first. The Y plane has one byte per pixel. For +<constant>V4L2_PIX_FMT_YVU410</constant>, the Cr plane immediately +follows the Y plane in memory. The Cr plane is ¼ the width and +¼ the height of the Y plane (and of the image). Each Cr belongs +to 16 pixels, a four-by-four square of the image. Following the Cr +plane is the Cb plane, just like the Cr plane. +<constant>V4L2_PIX_FMT_YUV410</constant> is the same, except the Cb +plane comes first, then the Cr plane.</para> + + <para>If the Y plane has pad bytes after each row, then the Cr +and Cb planes have ¼ as many pad bytes after their rows. In +other words, four Cx rows (including padding) are exactly as long as +one Y row (including padding).</para> + + <example> + <title><constant>V4L2_PIX_FMT_YVU410</constant> 4 × 4 +pixel image</title> + + <formalpara> + <title>Byte Order.</title> + <para>Each cell is one byte. + <informaltable frame="none"> + <tgroup cols="5" align="center"> + <colspec align="left" colwidth="2*" /> + <tbody valign="top"> + <row> + <entry>start + 0:</entry> + <entry>Y'<subscript>00</subscript></entry> + <entry>Y'<subscript>01</subscript></entry> + <entry>Y'<subscript>02</subscript></entry> + <entry>Y'<subscript>03</subscript></entry> + </row> + <row> + <entry>start + 4:</entry> + <entry>Y'<subscript>10</subscript></entry> + <entry>Y'<subscript>11</subscript></entry> + <entry>Y'<subscript>12</subscript></entry> + <entry>Y'<subscript>13</subscript></entry> + </row> + <row> + <entry>start + 8:</entry> + <entry>Y'<subscript>20</subscript></entry> + <entry>Y'<subscript>21</subscript></entry> + <entry>Y'<subscript>22</subscript></entry> + <entry>Y'<subscript>23</subscript></entry> + </row> + <row> + <entry>start + 12:</entry> + <entry>Y'<subscript>30</subscript></entry> + <entry>Y'<subscript>31</subscript></entry> + <entry>Y'<subscript>32</subscript></entry> + <entry>Y'<subscript>33</subscript></entry> + </row> + <row> + <entry>start + 16:</entry> + <entry>Cr<subscript>00</subscript></entry> + </row> + <row> + <entry>start + 17:</entry> + <entry>Cb<subscript>00</subscript></entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + + <formalpara> + <title>Color Sample Location.</title> + <para> + <informaltable frame="none"> + <tgroup cols="7" align="center"> + <tbody valign="top"> + <row> + <entry></entry> + <entry>0</entry><entry></entry><entry>1</entry><entry></entry> + <entry>2</entry><entry></entry><entry>3</entry> + </row> + <row> + <entry>0</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + <row> + <entry></entry> + </row> + <row> + <entry>1</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + <row> + <entry></entry> + <entry></entry><entry></entry><entry></entry><entry>C</entry> + <entry></entry><entry></entry><entry></entry> + </row> + <row> + <entry>2</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + <row> + <entry></entry> + </row> + <row> + <entry>3</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + </example> + </refsect1> + </refentry> diff --git a/Documentation/DocBook/media/v4l/pixfmt-yuv411p.xml b/Documentation/DocBook/media/v4l/pixfmt-yuv411p.xml new file mode 100644 index 00000000000..086dc731bf0 --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-yuv411p.xml @@ -0,0 +1,147 @@ + <refentry id="V4L2-PIX-FMT-YUV411P"> + <refmeta> + <refentrytitle>V4L2_PIX_FMT_YUV411P ('411P')</refentrytitle> + &manvol; + </refmeta> + <refnamediv> + <refname><constant>V4L2_PIX_FMT_YUV411P</constant></refname> + <refpurpose>Format with ¼ horizontal chroma resolution, +also known as YUV 4:1:1. Planar layout as opposed to +<constant>V4L2_PIX_FMT_Y41P</constant></refpurpose> + </refnamediv> + <refsect1> + <title>Description</title> + + <para>This format is not commonly used. This is a planar +format similar to the 4:2:2 planar format except with half as many +chroma. The three components are separated into three sub-images or +planes. The Y plane is first. The Y plane has one byte per pixel. The +Cb plane immediately follows the Y plane in memory. The Cb plane is +¼ the width of the Y plane (and of the image). Each Cb belongs +to 4 pixels all on the same row. For example, +Cb<subscript>0</subscript> belongs to Y'<subscript>00</subscript>, +Y'<subscript>01</subscript>, Y'<subscript>02</subscript> and +Y'<subscript>03</subscript>. Following the Cb plane is the Cr plane, +just like the Cb plane.</para> + + <para>If the Y plane has pad bytes after each row, then the Cr +and Cb planes have ¼ as many pad bytes after their rows. In +other words, four C x rows (including padding) is exactly as long as +one Y row (including padding).</para> + + <example> + <title><constant>V4L2_PIX_FMT_YUV411P</constant> 4 × 4 +pixel image</title> + + <formalpara> + <title>Byte Order.</title> + <para>Each cell is one byte. + <informaltable frame="none"> + <tgroup cols="5" align="center"> + <colspec align="left" colwidth="2*" /> + <tbody valign="top"> + <row> + <entry>start + 0:</entry> + <entry>Y'<subscript>00</subscript></entry> + <entry>Y'<subscript>01</subscript></entry> + <entry>Y'<subscript>02</subscript></entry> + <entry>Y'<subscript>03</subscript></entry> + </row> + <row> + <entry>start + 4:</entry> + <entry>Y'<subscript>10</subscript></entry> + <entry>Y'<subscript>11</subscript></entry> + <entry>Y'<subscript>12</subscript></entry> + <entry>Y'<subscript>13</subscript></entry> + </row> + <row> + <entry>start + 8:</entry> + <entry>Y'<subscript>20</subscript></entry> + <entry>Y'<subscript>21</subscript></entry> + <entry>Y'<subscript>22</subscript></entry> + <entry>Y'<subscript>23</subscript></entry> + </row> + <row> + <entry>start + 12:</entry> + <entry>Y'<subscript>30</subscript></entry> + <entry>Y'<subscript>31</subscript></entry> + <entry>Y'<subscript>32</subscript></entry> + <entry>Y'<subscript>33</subscript></entry> + </row> + <row> + <entry>start + 16:</entry> + <entry>Cb<subscript>00</subscript></entry> + </row> + <row> + <entry>start + 17:</entry> + <entry>Cb<subscript>10</subscript></entry> + </row> + <row> + <entry>start + 18:</entry> + <entry>Cb<subscript>20</subscript></entry> + </row> + <row> + <entry>start + 19:</entry> + <entry>Cb<subscript>30</subscript></entry> + </row> + <row> + <entry>start + 20:</entry> + <entry>Cr<subscript>00</subscript></entry> + </row> + <row> + <entry>start + 21:</entry> + <entry>Cr<subscript>10</subscript></entry> + </row> + <row> + <entry>start + 22:</entry> + <entry>Cr<subscript>20</subscript></entry> + </row> + <row> + <entry>start + 23:</entry> + <entry>Cr<subscript>30</subscript></entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + + <formalpara> + <title>Color Sample Location.</title> + <para> + <informaltable frame="none"> + <tgroup cols="7" align="center"> + <tbody valign="top"> + <row> + <entry></entry> + <entry>0</entry><entry></entry><entry>1</entry><entry></entry> + <entry>2</entry><entry></entry><entry>3</entry> + </row> + <row> + <entry>0</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + <row> + <entry>1</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + <row> + <entry>2</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + <row> + <entry>3</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry>C</entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + </example> + </refsect1> + </refentry> diff --git a/Documentation/DocBook/media/v4l/pixfmt-yuv420.xml b/Documentation/DocBook/media/v4l/pixfmt-yuv420.xml new file mode 100644 index 00000000000..48649fac159 --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-yuv420.xml @@ -0,0 +1,149 @@ + <refentry> + <refmeta> + <refentrytitle>V4L2_PIX_FMT_YVU420 ('YV12'), V4L2_PIX_FMT_YUV420 ('YU12')</refentrytitle> + &manvol; + </refmeta> + <refnamediv> + <refname id="V4L2-PIX-FMT-YVU420"><constant>V4L2_PIX_FMT_YVU420</constant></refname> + <refname id="V4L2-PIX-FMT-YUV420"><constant>V4L2_PIX_FMT_YUV420</constant></refname> + <refpurpose>Planar formats with ½ horizontal and +vertical chroma resolution, also known as YUV 4:2:0</refpurpose> + </refnamediv> + <refsect1> + <title>Description</title> + + <para>These are planar formats, as opposed to a packed format. +The three components are separated into three sub- images or planes. +The Y plane is first. The Y plane has one byte per pixel. For +<constant>V4L2_PIX_FMT_YVU420</constant>, the Cr plane immediately +follows the Y plane in memory. The Cr plane is half the width and half +the height of the Y plane (and of the image). Each Cr belongs to four +pixels, a two-by-two square of the image. For example, +Cr<subscript>0</subscript> belongs to Y'<subscript>00</subscript>, +Y'<subscript>01</subscript>, Y'<subscript>10</subscript>, and +Y'<subscript>11</subscript>. Following the Cr plane is the Cb plane, +just like the Cr plane. <constant>V4L2_PIX_FMT_YUV420</constant> is +the same except the Cb plane comes first, then the Cr plane.</para> + + <para>If the Y plane has pad bytes after each row, then the Cr +and Cb planes have half as many pad bytes after their rows. In other +words, two Cx rows (including padding) is exactly as long as one Y row +(including padding).</para> + + <example> + <title><constant>V4L2_PIX_FMT_YVU420</constant> 4 × 4 +pixel image</title> + + <formalpara> + <title>Byte Order.</title> + <para>Each cell is one byte. + <informaltable frame="none"> + <tgroup cols="5" align="center"> + <colspec align="left" colwidth="2*" /> + <tbody valign="top"> + <row> + <entry>start + 0:</entry> + <entry>Y'<subscript>00</subscript></entry> + <entry>Y'<subscript>01</subscript></entry> + <entry>Y'<subscript>02</subscript></entry> + <entry>Y'<subscript>03</subscript></entry> + </row> + <row> + <entry>start + 4:</entry> + <entry>Y'<subscript>10</subscript></entry> + <entry>Y'<subscript>11</subscript></entry> + <entry>Y'<subscript>12</subscript></entry> + <entry>Y'<subscript>13</subscript></entry> + </row> + <row> + <entry>start + 8:</entry> + <entry>Y'<subscript>20</subscript></entry> + <entry>Y'<subscript>21</subscript></entry> + <entry>Y'<subscript>22</subscript></entry> + <entry>Y'<subscript>23</subscript></entry> + </row> + <row> + <entry>start + 12:</entry> + <entry>Y'<subscript>30</subscript></entry> + <entry>Y'<subscript>31</subscript></entry> + <entry>Y'<subscript>32</subscript></entry> + <entry>Y'<subscript>33</subscript></entry> + </row> + <row> + <entry>start + 16:</entry> + <entry>Cr<subscript>00</subscript></entry> + <entry>Cr<subscript>01</subscript></entry> + </row> + <row> + <entry>start + 18:</entry> + <entry>Cr<subscript>10</subscript></entry> + <entry>Cr<subscript>11</subscript></entry> + </row> + <row> + <entry>start + 20:</entry> + <entry>Cb<subscript>00</subscript></entry> + <entry>Cb<subscript>01</subscript></entry> + </row> + <row> + <entry>start + 22:</entry> + <entry>Cb<subscript>10</subscript></entry> + <entry>Cb<subscript>11</subscript></entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + + <formalpara> + <title>Color Sample Location.</title> + <para> + <informaltable frame="none"> + <tgroup cols="7" align="center"> + <tbody valign="top"> + <row> + <entry></entry> + <entry>0</entry><entry></entry><entry>1</entry><entry></entry> + <entry>2</entry><entry></entry><entry>3</entry> + </row> + <row> + <entry>0</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + <row> + <entry></entry> + <entry></entry><entry>C</entry><entry></entry><entry></entry> + <entry></entry><entry>C</entry><entry></entry> + </row> + <row> + <entry>1</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + <row> + <entry></entry> + </row> + <row> + <entry>2</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + <row> + <entry></entry> + <entry></entry><entry>C</entry><entry></entry><entry></entry> + <entry></entry><entry>C</entry><entry></entry> + </row> + <row> + <entry>3</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + </example> + </refsect1> + </refentry> diff --git a/Documentation/DocBook/media/v4l/pixfmt-yuv420m.xml b/Documentation/DocBook/media/v4l/pixfmt-yuv420m.xml new file mode 100644 index 00000000000..60308f1eefd --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-yuv420m.xml @@ -0,0 +1,154 @@ + <refentry id="V4L2-PIX-FMT-YUV420M"> + <refmeta> + <refentrytitle>V4L2_PIX_FMT_YUV420M ('YM12')</refentrytitle> + &manvol; + </refmeta> + <refnamediv> + <refname> <constant>V4L2_PIX_FMT_YUV420M</constant></refname> + <refpurpose>Variation of <constant>V4L2_PIX_FMT_YUV420</constant> + with planes non contiguous in memory. </refpurpose> + </refnamediv> + + <refsect1> + <title>Description</title> + + <para>This is a multi-planar format, as opposed to a packed format. +The three components are separated into three sub- images or planes. + +The Y plane is first. The Y plane has one byte per pixel. The Cb data +constitutes the second plane which is half the width and half +the height of the Y plane (and of the image). Each Cb belongs to four +pixels, a two-by-two square of the image. For example, +Cb<subscript>0</subscript> belongs to Y'<subscript>00</subscript>, +Y'<subscript>01</subscript>, Y'<subscript>10</subscript>, and +Y'<subscript>11</subscript>. The Cr data, just like the Cb plane, is +in the third plane. </para> + + <para>If the Y plane has pad bytes after each row, then the Cb +and Cr planes have half as many pad bytes after their rows. In other +words, two Cx rows (including padding) is exactly as long as one Y row +(including padding).</para> + + <para><constant>V4L2_PIX_FMT_NV12M</constant> is intended to be +used only in drivers and applications that support the multi-planar API, +described in <xref linkend="planar-apis"/>. </para> + + <example> + <title><constant>V4L2_PIX_FMT_YVU420M</constant> 4 × 4 +pixel image</title> + + <formalpara> + <title>Byte Order.</title> + <para>Each cell is one byte. + <informaltable frame="none"> + <tgroup cols="5" align="center"> + <colspec align="left" colwidth="2*" /> + <tbody valign="top"> + <row> + <entry>start0 + 0:</entry> + <entry>Y'<subscript>00</subscript></entry> + <entry>Y'<subscript>01</subscript></entry> + <entry>Y'<subscript>02</subscript></entry> + <entry>Y'<subscript>03</subscript></entry> + </row> + <row> + <entry>start0 + 4:</entry> + <entry>Y'<subscript>10</subscript></entry> + <entry>Y'<subscript>11</subscript></entry> + <entry>Y'<subscript>12</subscript></entry> + <entry>Y'<subscript>13</subscript></entry> + </row> + <row> + <entry>start0 + 8:</entry> + <entry>Y'<subscript>20</subscript></entry> + <entry>Y'<subscript>21</subscript></entry> + <entry>Y'<subscript>22</subscript></entry> + <entry>Y'<subscript>23</subscript></entry> + </row> + <row> + <entry>start0 + 12:</entry> + <entry>Y'<subscript>30</subscript></entry> + <entry>Y'<subscript>31</subscript></entry> + <entry>Y'<subscript>32</subscript></entry> + <entry>Y'<subscript>33</subscript></entry> + </row> + <row><entry></entry></row> + <row> + <entry>start1 + 0:</entry> + <entry>Cb<subscript>00</subscript></entry> + <entry>Cb<subscript>01</subscript></entry> + </row> + <row> + <entry>start1 + 2:</entry> + <entry>Cb<subscript>10</subscript></entry> + <entry>Cb<subscript>11</subscript></entry> + </row> + <row><entry></entry></row> + <row> + <entry>start2 + 0:</entry> + <entry>Cr<subscript>00</subscript></entry> + <entry>Cr<subscript>01</subscript></entry> + </row> + <row> + <entry>start2 + 2:</entry> + <entry>Cr<subscript>10</subscript></entry> + <entry>Cr<subscript>11</subscript></entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + + <formalpara> + <title>Color Sample Location.</title> + <para> + <informaltable frame="none"> + <tgroup cols="7" align="center"> + <tbody valign="top"> + <row> + <entry></entry> + <entry>0</entry><entry></entry><entry>1</entry><entry></entry> + <entry>2</entry><entry></entry><entry>3</entry> + </row> + <row> + <entry>0</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + <row> + <entry></entry> + <entry></entry><entry>C</entry><entry></entry><entry></entry> + <entry></entry><entry>C</entry><entry></entry> + </row> + <row> + <entry>1</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + <row> + <entry></entry> + </row> + <row> + <entry>2</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + <row> + <entry></entry> + <entry></entry><entry>C</entry><entry></entry><entry></entry> + <entry></entry><entry>C</entry><entry></entry> + </row> + <row> + <entry>3</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + </example> + </refsect1> + </refentry> diff --git a/Documentation/DocBook/media/v4l/pixfmt-yuv422p.xml b/Documentation/DocBook/media/v4l/pixfmt-yuv422p.xml new file mode 100644 index 00000000000..4ce6463fe0a --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-yuv422p.xml @@ -0,0 +1,153 @@ + <refentry id="V4L2-PIX-FMT-YUV422P"> + <refmeta> + <refentrytitle>V4L2_PIX_FMT_YUV422P ('422P')</refentrytitle> + &manvol; + </refmeta> + <refnamediv> + <refname><constant>V4L2_PIX_FMT_YUV422P</constant></refname> + <refpurpose>Format with ½ horizontal chroma resolution, +also known as YUV 4:2:2. Planar layout as opposed to +<constant>V4L2_PIX_FMT_YUYV</constant></refpurpose> + </refnamediv> + <refsect1> + <title>Description</title> + + <para>This format is not commonly used. This is a planar +version of the YUYV format. The three components are separated into +three sub-images or planes. The Y plane is first. The Y plane has one +byte per pixel. The Cb plane immediately follows the Y plane in +memory. The Cb plane is half the width of the Y plane (and of the +image). Each Cb belongs to two pixels. For example, +Cb<subscript>0</subscript> belongs to Y'<subscript>00</subscript>, +Y'<subscript>01</subscript>. Following the Cb plane is the Cr plane, +just like the Cb plane.</para> + + <para>If the Y plane has pad bytes after each row, then the Cr +and Cb planes have half as many pad bytes after their rows. In other +words, two Cx rows (including padding) is exactly as long as one Y row +(including padding).</para> + + <example> + <title><constant>V4L2_PIX_FMT_YUV422P</constant> 4 × 4 +pixel image</title> + + <formalpara> + <title>Byte Order.</title> + <para>Each cell is one byte. + <informaltable frame="none"> + <tgroup cols="5" align="center"> + <colspec align="left" colwidth="2*" /> + <tbody valign="top"> + <row> + <entry>start + 0:</entry> + <entry>Y'<subscript>00</subscript></entry> + <entry>Y'<subscript>01</subscript></entry> + <entry>Y'<subscript>02</subscript></entry> + <entry>Y'<subscript>03</subscript></entry> + </row> + <row> + <entry>start + 4:</entry> + <entry>Y'<subscript>10</subscript></entry> + <entry>Y'<subscript>11</subscript></entry> + <entry>Y'<subscript>12</subscript></entry> + <entry>Y'<subscript>13</subscript></entry> + </row> + <row> + <entry>start + 8:</entry> + <entry>Y'<subscript>20</subscript></entry> + <entry>Y'<subscript>21</subscript></entry> + <entry>Y'<subscript>22</subscript></entry> + <entry>Y'<subscript>23</subscript></entry> + </row> + <row> + <entry>start + 12:</entry> + <entry>Y'<subscript>30</subscript></entry> + <entry>Y'<subscript>31</subscript></entry> + <entry>Y'<subscript>32</subscript></entry> + <entry>Y'<subscript>33</subscript></entry> + </row> + <row> + <entry>start + 16:</entry> + <entry>Cb<subscript>00</subscript></entry> + <entry>Cb<subscript>01</subscript></entry> + </row> + <row> + <entry>start + 18:</entry> + <entry>Cb<subscript>10</subscript></entry> + <entry>Cb<subscript>11</subscript></entry> + </row> + <row> + <entry>start + 20:</entry> + <entry>Cb<subscript>20</subscript></entry> + <entry>Cb<subscript>21</subscript></entry> + </row> + <row> + <entry>start + 22:</entry> + <entry>Cb<subscript>30</subscript></entry> + <entry>Cb<subscript>31</subscript></entry> + </row> + <row> + <entry>start + 24:</entry> + <entry>Cr<subscript>00</subscript></entry> + <entry>Cr<subscript>01</subscript></entry> + </row> + <row> + <entry>start + 26:</entry> + <entry>Cr<subscript>10</subscript></entry> + <entry>Cr<subscript>11</subscript></entry> + </row> + <row> + <entry>start + 28:</entry> + <entry>Cr<subscript>20</subscript></entry> + <entry>Cr<subscript>21</subscript></entry> + </row> + <row> + <entry>start + 30:</entry> + <entry>Cr<subscript>30</subscript></entry> + <entry>Cr<subscript>31</subscript></entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + + <formalpara> + <title>Color Sample Location.</title> + <para> + <informaltable frame="none"> + <tgroup cols="7" align="center"> + <tbody valign="top"> + <row> + <entry></entry> + <entry>0</entry><entry></entry><entry>1</entry><entry></entry> + <entry>2</entry><entry></entry><entry>3</entry> + </row> + <row> + <entry>0</entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry> + </row> + <row> + <entry>1</entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry> + </row> + <row> + <entry>2</entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry> + </row> + <row> + <entry>3</entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + </example> + </refsect1> + </refentry> diff --git a/Documentation/DocBook/media/v4l/pixfmt-yuyv.xml b/Documentation/DocBook/media/v4l/pixfmt-yuyv.xml new file mode 100644 index 00000000000..58384092251 --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-yuyv.xml @@ -0,0 +1,120 @@ + <refentry id="V4L2-PIX-FMT-YUYV"> + <refmeta> + <refentrytitle>V4L2_PIX_FMT_YUYV ('YUYV')</refentrytitle> + &manvol; + </refmeta> + <refnamediv> + <refname><constant>V4L2_PIX_FMT_YUYV</constant></refname> + <refpurpose>Packed format with ½ horizontal chroma +resolution, also known as YUV 4:2:2</refpurpose> + </refnamediv> + <refsect1> + <title>Description</title> + + <para>In this format each four bytes is two pixels. Each four +bytes is two Y's, a Cb and a Cr. Each Y goes to one of the pixels, and +the Cb and Cr belong to both pixels. As you can see, the Cr and Cb +components have half the horizontal resolution of the Y component. +<constant>V4L2_PIX_FMT_YUYV </constant> is known in the Windows +environment as YUY2.</para> + + <example> + <title><constant>V4L2_PIX_FMT_YUYV</constant> 4 × 4 +pixel image</title> + + <formalpara> + <title>Byte Order.</title> + <para>Each cell is one byte. + <informaltable frame="none"> + <tgroup cols="9" align="center"> + <colspec align="left" colwidth="2*" /> + <tbody valign="top"> + <row> + <entry>start + 0:</entry> + <entry>Y'<subscript>00</subscript></entry> + <entry>Cb<subscript>00</subscript></entry> + <entry>Y'<subscript>01</subscript></entry> + <entry>Cr<subscript>00</subscript></entry> + <entry>Y'<subscript>02</subscript></entry> + <entry>Cb<subscript>01</subscript></entry> + <entry>Y'<subscript>03</subscript></entry> + <entry>Cr<subscript>01</subscript></entry> + </row> + <row> + <entry>start + 8:</entry> + <entry>Y'<subscript>10</subscript></entry> + <entry>Cb<subscript>10</subscript></entry> + <entry>Y'<subscript>11</subscript></entry> + <entry>Cr<subscript>10</subscript></entry> + <entry>Y'<subscript>12</subscript></entry> + <entry>Cb<subscript>11</subscript></entry> + <entry>Y'<subscript>13</subscript></entry> + <entry>Cr<subscript>11</subscript></entry> + </row> + <row> + <entry>start + 16:</entry> + <entry>Y'<subscript>20</subscript></entry> + <entry>Cb<subscript>20</subscript></entry> + <entry>Y'<subscript>21</subscript></entry> + <entry>Cr<subscript>20</subscript></entry> + <entry>Y'<subscript>22</subscript></entry> + <entry>Cb<subscript>21</subscript></entry> + <entry>Y'<subscript>23</subscript></entry> + <entry>Cr<subscript>21</subscript></entry> + </row> + <row> + <entry>start + 24:</entry> + <entry>Y'<subscript>30</subscript></entry> + <entry>Cb<subscript>30</subscript></entry> + <entry>Y'<subscript>31</subscript></entry> + <entry>Cr<subscript>30</subscript></entry> + <entry>Y'<subscript>32</subscript></entry> + <entry>Cb<subscript>31</subscript></entry> + <entry>Y'<subscript>33</subscript></entry> + <entry>Cr<subscript>31</subscript></entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + + <formalpara> + <title>Color Sample Location.</title> + <para> + <informaltable frame="none"> + <tgroup cols="7" align="center"> + <tbody valign="top"> + <row> + <entry></entry> + <entry>0</entry><entry></entry><entry>1</entry><entry></entry> + <entry>2</entry><entry></entry><entry>3</entry> + </row> + <row> + <entry>0</entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry> + </row> + <row> + <entry>1</entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry> + </row> + <row> + <entry>2</entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry> + </row> + <row> + <entry>3</entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + </example> + </refsect1> + </refentry> diff --git a/Documentation/DocBook/media/v4l/pixfmt-yvu420m.xml b/Documentation/DocBook/media/v4l/pixfmt-yvu420m.xml new file mode 100644 index 00000000000..2330667907c --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-yvu420m.xml @@ -0,0 +1,154 @@ + <refentry id="V4L2-PIX-FMT-YVU420M"> + <refmeta> + <refentrytitle>V4L2_PIX_FMT_YVU420M ('YM21')</refentrytitle> + &manvol; + </refmeta> + <refnamediv> + <refname> <constant>V4L2_PIX_FMT_YVU420M</constant></refname> + <refpurpose>Variation of <constant>V4L2_PIX_FMT_YVU420</constant> + with planes non contiguous in memory. </refpurpose> + </refnamediv> + + <refsect1> + <title>Description</title> + + <para>This is a multi-planar format, as opposed to a packed format. +The three components are separated into three sub-images or planes. + +The Y plane is first. The Y plane has one byte per pixel. The Cr data +constitutes the second plane which is half the width and half +the height of the Y plane (and of the image). Each Cr belongs to four +pixels, a two-by-two square of the image. For example, +Cr<subscript>0</subscript> belongs to Y'<subscript>00</subscript>, +Y'<subscript>01</subscript>, Y'<subscript>10</subscript>, and +Y'<subscript>11</subscript>. The Cb data, just like the Cr plane, constitutes +the third plane. </para> + + <para>If the Y plane has pad bytes after each row, then the Cr +and Cb planes have half as many pad bytes after their rows. In other +words, two Cx rows (including padding) is exactly as long as one Y row +(including padding).</para> + + <para><constant>V4L2_PIX_FMT_YVU420M</constant> is intended to be +used only in drivers and applications that support the multi-planar API, +described in <xref linkend="planar-apis"/>. </para> + + <example> + <title><constant>V4L2_PIX_FMT_YVU420M</constant> 4 × 4 +pixel image</title> + + <formalpara> + <title>Byte Order.</title> + <para>Each cell is one byte. + <informaltable frame="none"> + <tgroup cols="5" align="center"> + <colspec align="left" colwidth="2*" /> + <tbody valign="top"> + <row> + <entry>start0 + 0:</entry> + <entry>Y'<subscript>00</subscript></entry> + <entry>Y'<subscript>01</subscript></entry> + <entry>Y'<subscript>02</subscript></entry> + <entry>Y'<subscript>03</subscript></entry> + </row> + <row> + <entry>start0 + 4:</entry> + <entry>Y'<subscript>10</subscript></entry> + <entry>Y'<subscript>11</subscript></entry> + <entry>Y'<subscript>12</subscript></entry> + <entry>Y'<subscript>13</subscript></entry> + </row> + <row> + <entry>start0 + 8:</entry> + <entry>Y'<subscript>20</subscript></entry> + <entry>Y'<subscript>21</subscript></entry> + <entry>Y'<subscript>22</subscript></entry> + <entry>Y'<subscript>23</subscript></entry> + </row> + <row> + <entry>start0 + 12:</entry> + <entry>Y'<subscript>30</subscript></entry> + <entry>Y'<subscript>31</subscript></entry> + <entry>Y'<subscript>32</subscript></entry> + <entry>Y'<subscript>33</subscript></entry> + </row> + <row><entry></entry></row> + <row> + <entry>start1 + 0:</entry> + <entry>Cr<subscript>00</subscript></entry> + <entry>Cr<subscript>01</subscript></entry> + </row> + <row> + <entry>start1 + 2:</entry> + <entry>Cr<subscript>10</subscript></entry> + <entry>Cr<subscript>11</subscript></entry> + </row> + <row><entry></entry></row> + <row> + <entry>start2 + 0:</entry> + <entry>Cb<subscript>00</subscript></entry> + <entry>Cb<subscript>01</subscript></entry> + </row> + <row> + <entry>start2 + 2:</entry> + <entry>Cb<subscript>10</subscript></entry> + <entry>Cb<subscript>11</subscript></entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + + <formalpara> + <title>Color Sample Location.</title> + <para> + <informaltable frame="none"> + <tgroup cols="7" align="center"> + <tbody valign="top"> + <row> + <entry></entry> + <entry>0</entry><entry></entry><entry>1</entry><entry></entry> + <entry>2</entry><entry></entry><entry>3</entry> + </row> + <row> + <entry>0</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + <row> + <entry></entry> + <entry></entry><entry>C</entry><entry></entry><entry></entry> + <entry></entry><entry>C</entry><entry></entry> + </row> + <row> + <entry>1</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + <row> + <entry></entry> + </row> + <row> + <entry>2</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + <row> + <entry></entry> + <entry></entry><entry>C</entry><entry></entry><entry></entry> + <entry></entry><entry>C</entry><entry></entry> + </row> + <row> + <entry>3</entry> + <entry>Y</entry><entry></entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry></entry><entry>Y</entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + </example> + </refsect1> + </refentry> diff --git a/Documentation/DocBook/media/v4l/pixfmt-yvyu.xml b/Documentation/DocBook/media/v4l/pixfmt-yvyu.xml new file mode 100644 index 00000000000..bfffdc76d3d --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt-yvyu.xml @@ -0,0 +1,120 @@ + <refentry id="V4L2-PIX-FMT-YVYU"> + <refmeta> + <refentrytitle>V4L2_PIX_FMT_YVYU ('YVYU')</refentrytitle> + &manvol; + </refmeta> + <refnamediv> + <refname><constant>V4L2_PIX_FMT_YVYU</constant></refname> + <refpurpose>Variation of +<constant>V4L2_PIX_FMT_YUYV</constant> with different order of samples +in memory</refpurpose> + </refnamediv> + <refsect1> + <title>Description</title> + + <para>In this format each four bytes is two pixels. Each four +bytes is two Y's, a Cb and a Cr. Each Y goes to one of the pixels, and +the Cb and Cr belong to both pixels. As you can see, the Cr and Cb +components have half the horizontal resolution of the Y +component.</para> + + <example> + <title><constant>V4L2_PIX_FMT_YVYU</constant> 4 × 4 +pixel image</title> + + <formalpara> + <title>Byte Order.</title> + <para>Each cell is one byte. + <informaltable frame="none"> + <tgroup cols="9" align="center"> + <colspec align="left" colwidth="2*" /> + <tbody valign="top"> + <row> + <entry>start + 0:</entry> + <entry>Y'<subscript>00</subscript></entry> + <entry>Cr<subscript>00</subscript></entry> + <entry>Y'<subscript>01</subscript></entry> + <entry>Cb<subscript>00</subscript></entry> + <entry>Y'<subscript>02</subscript></entry> + <entry>Cr<subscript>01</subscript></entry> + <entry>Y'<subscript>03</subscript></entry> + <entry>Cb<subscript>01</subscript></entry> + </row> + <row> + <entry>start + 8:</entry> + <entry>Y'<subscript>10</subscript></entry> + <entry>Cr<subscript>10</subscript></entry> + <entry>Y'<subscript>11</subscript></entry> + <entry>Cb<subscript>10</subscript></entry> + <entry>Y'<subscript>12</subscript></entry> + <entry>Cr<subscript>11</subscript></entry> + <entry>Y'<subscript>13</subscript></entry> + <entry>Cb<subscript>11</subscript></entry> + </row> + <row> + <entry>start + 16:</entry> + <entry>Y'<subscript>20</subscript></entry> + <entry>Cr<subscript>20</subscript></entry> + <entry>Y'<subscript>21</subscript></entry> + <entry>Cb<subscript>20</subscript></entry> + <entry>Y'<subscript>22</subscript></entry> + <entry>Cr<subscript>21</subscript></entry> + <entry>Y'<subscript>23</subscript></entry> + <entry>Cb<subscript>21</subscript></entry> + </row> + <row> + <entry>start + 24:</entry> + <entry>Y'<subscript>30</subscript></entry> + <entry>Cr<subscript>30</subscript></entry> + <entry>Y'<subscript>31</subscript></entry> + <entry>Cb<subscript>30</subscript></entry> + <entry>Y'<subscript>32</subscript></entry> + <entry>Cr<subscript>31</subscript></entry> + <entry>Y'<subscript>33</subscript></entry> + <entry>Cb<subscript>31</subscript></entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + + <formalpara> + <title>Color Sample Location.</title> + <para> + <informaltable frame="none"> + <tgroup cols="7" align="center"> + <tbody valign="top"> + <row> + <entry></entry> + <entry>0</entry><entry></entry><entry>1</entry><entry></entry> + <entry>2</entry><entry></entry><entry>3</entry> + </row> + <row> + <entry>0</entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry> + </row> + <row> + <entry>1</entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry> + </row> + <row> + <entry>2</entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry> + </row> + <row> + <entry>3</entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry><entry></entry> + <entry>Y</entry><entry>C</entry><entry>Y</entry> + </row> + </tbody> + </tgroup> + </informaltable> + </para> + </formalpara> + </example> + </refsect1> + </refentry> diff --git a/Documentation/DocBook/media/v4l/pixfmt.xml b/Documentation/DocBook/media/v4l/pixfmt.xml new file mode 100644 index 00000000000..91dcbc84f3f --- /dev/null +++ b/Documentation/DocBook/media/v4l/pixfmt.xml @@ -0,0 +1,1063 @@ + <title>Image Formats</title> + + <para>The V4L2 API was primarily designed for devices exchanging +image data with applications. The +<structname>v4l2_pix_format</structname> and <structname>v4l2_pix_format_mplane +</structname> structures define the format and layout of an image in memory. +The former is used with the single-planar API, while the latter is used with the +multi-planar version (see <xref linkend="planar-apis"/>). Image formats are +negotiated with the &VIDIOC-S-FMT; ioctl. (The explanations here focus on video +capturing and output, for overlay frame buffer formats see also +&VIDIOC-G-FBUF;.)</para> + +<section> + <title>Single-planar format structure</title> + <table pgwide="1" frame="none" id="v4l2-pix-format"> + <title>struct <structname>v4l2_pix_format</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>width</structfield></entry> + <entry>Image width in pixels.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>height</structfield></entry> + <entry>Image height in pixels. If <structfield>field</structfield> is + one of <constant>V4L2_FIELD_TOP</constant>, <constant>V4L2_FIELD_BOTTOM</constant> + or <constant>V4L2_FIELD_ALTERNATE</constant> then height refers to the + number of lines in the field, otherwise it refers to the number of + lines in the frame (which is twice the field height for interlaced + formats).</entry> + </row> + <row> + <entry spanname="hspan">Applications set these fields to +request an image size, drivers return the closest possible values. In +case of planar formats the <structfield>width</structfield> and +<structfield>height</structfield> applies to the largest plane. To +avoid ambiguities drivers must return values rounded up to a multiple +of the scale factor of any smaller planes. For example when the image +format is YUV 4:2:0, <structfield>width</structfield> and +<structfield>height</structfield> must be multiples of two.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>pixelformat</structfield></entry> + <entry>The pixel format or type of compression, set by the +application. This is a little endian <link +linkend="v4l2-fourcc">four character code</link>. V4L2 defines +standard RGB formats in <xref linkend="rgb-formats" />, YUV formats in <xref +linkend="yuv-formats" />, and reserved codes in <xref +linkend="reserved-formats" /></entry> + </row> + <row> + <entry>&v4l2-field;</entry> + <entry><structfield>field</structfield></entry> + <entry>Video images are typically interlaced. Applications +can request to capture or output only the top or bottom field, or both +fields interlaced or sequentially stored in one buffer or alternating +in separate buffers. Drivers return the actual field order selected. +For more details on fields see <xref linkend="field-order" />.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>bytesperline</structfield></entry> + <entry>Distance in bytes between the leftmost pixels in two +adjacent lines.</entry> + </row> + <row> + <entry spanname="hspan"><para>Both applications and drivers +can set this field to request padding bytes at the end of each line. +Drivers however may ignore the value requested by the application, +returning <structfield>width</structfield> times bytes per pixel or a +larger value required by the hardware. That implies applications can +just set this field to zero to get a reasonable +default.</para><para>Video hardware may access padding bytes, +therefore they must reside in accessible memory. Consider cases where +padding bytes after the last line of an image cross a system page +boundary. Input devices may write padding bytes, the value is +undefined. Output devices ignore the contents of padding +bytes.</para><para>When the image format is planar the +<structfield>bytesperline</structfield> value applies to the largest +plane and is divided by the same factor as the +<structfield>width</structfield> field for any smaller planes. For +example the Cb and Cr planes of a YUV 4:2:0 image have half as many +padding bytes following each line as the Y plane. To avoid ambiguities +drivers must return a <structfield>bytesperline</structfield> value +rounded up to a multiple of the scale factor.</para> +<para>For compressed formats the <structfield>bytesperline</structfield> +value makes no sense. Applications and drivers must set this to 0 in +that case.</para></entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>sizeimage</structfield></entry> + <entry>Size in bytes of the buffer to hold a complete image, +set by the driver. Usually this is +<structfield>bytesperline</structfield> times +<structfield>height</structfield>. When the image consists of variable +length compressed data this is the maximum number of bytes required to +hold an image.</entry> + </row> + <row> + <entry>&v4l2-colorspace;</entry> + <entry><structfield>colorspace</structfield></entry> + <entry>This information supplements the +<structfield>pixelformat</structfield> and must be set by the driver for +capture streams and by the application for output streams, +see <xref linkend="colorspaces" />.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>priv</structfield></entry> + <entry>Reserved for custom (driver defined) additional +information about formats. When not used drivers and applications must +set this field to zero.</entry> + </row> + </tbody> + </tgroup> + </table> +</section> + +<section> + <title>Multi-planar format structures</title> + <para>The <structname>v4l2_plane_pix_format</structname> structures define + size and layout for each of the planes in a multi-planar format. + The <structname>v4l2_pix_format_mplane</structname> structure contains + information common to all planes (such as image width and height) and + an array of <structname>v4l2_plane_pix_format</structname> structures, + describing all planes of that format.</para> + <table pgwide="1" frame="none" id="v4l2-plane-pix-format"> + <title>struct <structname>v4l2_plane_pix_format</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>sizeimage</structfield></entry> + <entry>Maximum size in bytes required for image data in this plane. + </entry> + </row> + <row> + <entry>__u16</entry> + <entry><structfield>bytesperline</structfield></entry> + <entry>Distance in bytes between the leftmost pixels in two adjacent + lines. See &v4l2-pix-format;.</entry> + </row> + <row> + <entry>__u16</entry> + <entry><structfield>reserved[7]</structfield></entry> + <entry>Reserved for future extensions. Should be zeroed by the + application.</entry> + </row> + </tbody> + </tgroup> + </table> + <table pgwide="1" frame="none" id="v4l2-pix-format-mplane"> + <title>struct <structname>v4l2_pix_format_mplane</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>width</structfield></entry> + <entry>Image width in pixels. See &v4l2-pix-format;.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>height</structfield></entry> + <entry>Image height in pixels. See &v4l2-pix-format;.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>pixelformat</structfield></entry> + <entry>The pixel format. Both single- and multi-planar four character +codes can be used.</entry> + </row> + <row> + <entry>&v4l2-field;</entry> + <entry><structfield>field</structfield></entry> + <entry>See &v4l2-pix-format;.</entry> + </row> + <row> + <entry>&v4l2-colorspace;</entry> + <entry><structfield>colorspace</structfield></entry> + <entry>See &v4l2-pix-format;.</entry> + </row> + <row> + <entry>&v4l2-plane-pix-format;</entry> + <entry><structfield>plane_fmt[VIDEO_MAX_PLANES]</structfield></entry> + <entry>An array of structures describing format of each plane this + pixel format consists of. The number of valid entries in this array + has to be put in the <structfield>num_planes</structfield> + field.</entry> + </row> + <row> + <entry>__u8</entry> + <entry><structfield>num_planes</structfield></entry> + <entry>Number of planes (i.e. separate memory buffers) for this format + and the number of valid entries in the + <structfield>plane_fmt</structfield> array.</entry> + </row> + <row> + <entry>__u8</entry> + <entry><structfield>reserved[11]</structfield></entry> + <entry>Reserved for future extensions. Should be zeroed by the + application.</entry> + </row> + </tbody> + </tgroup> + </table> +</section> + + <section> + <title>Standard Image Formats</title> + + <para>In order to exchange images between drivers and +applications, it is necessary to have standard image data formats +which both sides will interpret the same way. V4L2 includes several +such formats, and this section is intended to be an unambiguous +specification of the standard image data formats in V4L2.</para> + + <para>V4L2 drivers are not limited to these formats, however. +Driver-specific formats are possible. In that case the application may +depend on a codec to convert images to one of the standard formats +when needed. But the data can still be stored and retrieved in the +proprietary format. For example, a device may support a proprietary +compressed format. Applications can still capture and save the data in +the compressed format, saving much disk space, and later use a codec +to convert the images to the X Windows screen format when the video is +to be displayed.</para> + + <para>Even so, ultimately, some standard formats are needed, so +the V4L2 specification would not be complete without well-defined +standard formats.</para> + + <para>The V4L2 standard formats are mainly uncompressed formats. The +pixels are always arranged in memory from left to right, and from top +to bottom. The first byte of data in the image buffer is always for +the leftmost pixel of the topmost row. Following that is the pixel +immediately to its right, and so on until the end of the top row of +pixels. Following the rightmost pixel of the row there may be zero or +more bytes of padding to guarantee that each row of pixel data has a +certain alignment. Following the pad bytes, if any, is data for the +leftmost pixel of the second row from the top, and so on. The last row +has just as many pad bytes after it as the other rows.</para> + + <para>In V4L2 each format has an identifier which looks like +<constant>PIX_FMT_XXX</constant>, defined in the <link +linkend="videodev">videodev.h</link> header file. These identifiers +represent <link linkend="v4l2-fourcc">four character (FourCC) codes</link> +which are also listed below, however they are not the same as those +used in the Windows world.</para> + + <para>For some formats, data is stored in separate, discontiguous +memory buffers. Those formats are identified by a separate set of FourCC codes +and are referred to as "multi-planar formats". For example, a YUV422 frame is +normally stored in one memory buffer, but it can also be placed in two or three +separate buffers, with Y component in one buffer and CbCr components in another +in the 2-planar version or with each component in its own buffer in the +3-planar case. Those sub-buffers are referred to as "planes".</para> + </section> + + <section id="colorspaces"> + <title>Colorspaces</title> + + <para>[intro]</para> + + <!-- See proposal by Billy Biggs, video4linux-list@redhat.com +on 11 Oct 2002, subject: "Re: [V4L] Re: v4l2 api", and +http://vektor.theorem.ca/graphics/ycbcr/ and +http://www.poynton.com/notes/colour_and_gamma/ColorFAQ.html --> + + <para> + <variablelist> + <varlistentry> + <term>Gamma Correction</term> + <listitem> + <para>[to do]</para> + <para>E'<subscript>R</subscript> = f(R)</para> + <para>E'<subscript>G</subscript> = f(G)</para> + <para>E'<subscript>B</subscript> = f(B)</para> + </listitem> + </varlistentry> + <varlistentry> + <term>Construction of luminance and color-difference +signals</term> + <listitem> + <para>[to do]</para> + <para>E'<subscript>Y</subscript> = +Coeff<subscript>R</subscript> E'<subscript>R</subscript> ++ Coeff<subscript>G</subscript> E'<subscript>G</subscript> ++ Coeff<subscript>B</subscript> E'<subscript>B</subscript></para> + <para>(E'<subscript>R</subscript> - E'<subscript>Y</subscript>) = E'<subscript>R</subscript> +- Coeff<subscript>R</subscript> E'<subscript>R</subscript> +- Coeff<subscript>G</subscript> E'<subscript>G</subscript> +- Coeff<subscript>B</subscript> E'<subscript>B</subscript></para> + <para>(E'<subscript>B</subscript> - E'<subscript>Y</subscript>) = E'<subscript>B</subscript> +- Coeff<subscript>R</subscript> E'<subscript>R</subscript> +- Coeff<subscript>G</subscript> E'<subscript>G</subscript> +- Coeff<subscript>B</subscript> E'<subscript>B</subscript></para> + </listitem> + </varlistentry> + <varlistentry> + <term>Re-normalized color-difference signals</term> + <listitem> + <para>The color-difference signals are scaled back to unity +range [-0.5;+0.5]:</para> + <para>K<subscript>B</subscript> = 0.5 / (1 - Coeff<subscript>B</subscript>)</para> + <para>K<subscript>R</subscript> = 0.5 / (1 - Coeff<subscript>R</subscript>)</para> + <para>P<subscript>B</subscript> = +K<subscript>B</subscript> (E'<subscript>B</subscript> - E'<subscript>Y</subscript>) = + 0.5 (Coeff<subscript>R</subscript> / Coeff<subscript>B</subscript>) E'<subscript>R</subscript> ++ 0.5 (Coeff<subscript>G</subscript> / Coeff<subscript>B</subscript>) E'<subscript>G</subscript> ++ 0.5 E'<subscript>B</subscript></para> + <para>P<subscript>R</subscript> = +K<subscript>R</subscript> (E'<subscript>R</subscript> - E'<subscript>Y</subscript>) = + 0.5 E'<subscript>R</subscript> ++ 0.5 (Coeff<subscript>G</subscript> / Coeff<subscript>R</subscript>) E'<subscript>G</subscript> ++ 0.5 (Coeff<subscript>B</subscript> / Coeff<subscript>R</subscript>) E'<subscript>B</subscript></para> + </listitem> + </varlistentry> + <varlistentry> + <term>Quantization</term> + <listitem> + <para>[to do]</para> + <para>Y' = (Lum. Levels - 1) · E'<subscript>Y</subscript> + Lum. Offset</para> + <para>C<subscript>B</subscript> = (Chrom. Levels - 1) +· P<subscript>B</subscript> + Chrom. Offset</para> + <para>C<subscript>R</subscript> = (Chrom. Levels - 1) +· P<subscript>R</subscript> + Chrom. Offset</para> + <para>Rounding to the nearest integer and clamping to the range +[0;255] finally yields the digital color components Y'CbCr +stored in YUV images.</para> + </listitem> + </varlistentry> + </variablelist> + </para> + + <example> + <title>ITU-R Rec. BT.601 color conversion</title> + + <para>Forward Transformation</para> + + <programlisting> +int ER, EG, EB; /* gamma corrected RGB input [0;255] */ +int Y1, Cb, Cr; /* output [0;255] */ + +double r, g, b; /* temporaries */ +double y1, pb, pr; + +int +clamp (double x) +{ + int r = x; /* round to nearest */ + + if (r < 0) return 0; + else if (r > 255) return 255; + else return r; +} + +r = ER / 255.0; +g = EG / 255.0; +b = EB / 255.0; + +y1 = 0.299 * r + 0.587 * g + 0.114 * b; +pb = -0.169 * r - 0.331 * g + 0.5 * b; +pr = 0.5 * r - 0.419 * g - 0.081 * b; + +Y1 = clamp (219 * y1 + 16); +Cb = clamp (224 * pb + 128); +Cr = clamp (224 * pr + 128); + +/* or shorter */ + +y1 = 0.299 * ER + 0.587 * EG + 0.114 * EB; + +Y1 = clamp ( (219 / 255.0) * y1 + 16); +Cb = clamp (((224 / 255.0) / (2 - 2 * 0.114)) * (EB - y1) + 128); +Cr = clamp (((224 / 255.0) / (2 - 2 * 0.299)) * (ER - y1) + 128); + </programlisting> + + <para>Inverse Transformation</para> + + <programlisting> +int Y1, Cb, Cr; /* gamma pre-corrected input [0;255] */ +int ER, EG, EB; /* output [0;255] */ + +double r, g, b; /* temporaries */ +double y1, pb, pr; + +int +clamp (double x) +{ + int r = x; /* round to nearest */ + + if (r < 0) return 0; + else if (r > 255) return 255; + else return r; +} + +y1 = (Y1 - 16) / 219.0; +pb = (Cb - 128) / 224.0; +pr = (Cr - 128) / 224.0; + +r = 1.0 * y1 + 0 * pb + 1.402 * pr; +g = 1.0 * y1 - 0.344 * pb - 0.714 * pr; +b = 1.0 * y1 + 1.772 * pb + 0 * pr; + +ER = clamp (r * 255); /* [ok? one should prob. limit y1,pb,pr] */ +EG = clamp (g * 255); +EB = clamp (b * 255); + </programlisting> + </example> + + <table pgwide="1" id="v4l2-colorspace" orient="land"> + <title>enum v4l2_colorspace</title> + <tgroup cols="11" align="center"> + <colspec align="left" /> + <colspec align="center" /> + <colspec align="left" /> + <colspec colname="cr" /> + <colspec colname="cg" /> + <colspec colname="cb" /> + <colspec colname="wp" /> + <colspec colname="gc" /> + <colspec colname="lum" /> + <colspec colname="qy" /> + <colspec colname="qc" /> + <spanspec namest="cr" nameend="cb" spanname="chrom" /> + <spanspec namest="qy" nameend="qc" spanname="quant" /> + <spanspec namest="lum" nameend="qc" spanname="spam" /> + <thead> + <row> + <entry morerows="1">Identifier</entry> + <entry morerows="1">Value</entry> + <entry morerows="1">Description</entry> + <entry spanname="chrom">Chromaticities<footnote> + <para>The coordinates of the color primaries are +given in the CIE system (1931)</para> + </footnote></entry> + <entry morerows="1">White Point</entry> + <entry morerows="1">Gamma Correction</entry> + <entry morerows="1">Luminance E'<subscript>Y</subscript></entry> + <entry spanname="quant">Quantization</entry> + </row> + <row> + <entry>Red</entry> + <entry>Green</entry> + <entry>Blue</entry> + <entry>Y'</entry> + <entry>Cb, Cr</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry><constant>V4L2_COLORSPACE_SMPTE170M</constant></entry> + <entry>1</entry> + <entry>NTSC/PAL according to <xref linkend="smpte170m" />, +<xref linkend="itu601" /></entry> + <entry>x = 0.630, y = 0.340</entry> + <entry>x = 0.310, y = 0.595</entry> + <entry>x = 0.155, y = 0.070</entry> + <entry>x = 0.3127, y = 0.3290, + Illuminant D<subscript>65</subscript></entry> + <entry>E' = 4.5 I for I ≤0.018, +1.099 I<superscript>0.45</superscript> - 0.099 for 0.018 < I</entry> + <entry>0.299 E'<subscript>R</subscript> ++ 0.587 E'<subscript>G</subscript> ++ 0.114 E'<subscript>B</subscript></entry> + <entry>219 E'<subscript>Y</subscript> + 16</entry> + <entry>224 P<subscript>B,R</subscript> + 128</entry> + </row> + <row> + <entry><constant>V4L2_COLORSPACE_SMPTE240M</constant></entry> + <entry>2</entry> + <entry>1125-Line (US) HDTV, see <xref +linkend="smpte240m" /></entry> + <entry>x = 0.630, y = 0.340</entry> + <entry>x = 0.310, y = 0.595</entry> + <entry>x = 0.155, y = 0.070</entry> + <entry>x = 0.3127, y = 0.3290, + Illuminant D<subscript>65</subscript></entry> + <entry>E' = 4 I for I ≤0.0228, +1.1115 I<superscript>0.45</superscript> - 0.1115 for 0.0228 < I</entry> + <entry>0.212 E'<subscript>R</subscript> ++ 0.701 E'<subscript>G</subscript> ++ 0.087 E'<subscript>B</subscript></entry> + <entry>219 E'<subscript>Y</subscript> + 16</entry> + <entry>224 P<subscript>B,R</subscript> + 128</entry> + </row> + <row> + <entry><constant>V4L2_COLORSPACE_REC709</constant></entry> + <entry>3</entry> + <entry>HDTV and modern devices, see <xref +linkend="itu709" /></entry> + <entry>x = 0.640, y = 0.330</entry> + <entry>x = 0.300, y = 0.600</entry> + <entry>x = 0.150, y = 0.060</entry> + <entry>x = 0.3127, y = 0.3290, + Illuminant D<subscript>65</subscript></entry> + <entry>E' = 4.5 I for I ≤0.018, +1.099 I<superscript>0.45</superscript> - 0.099 for 0.018 < I</entry> + <entry>0.2125 E'<subscript>R</subscript> ++ 0.7154 E'<subscript>G</subscript> ++ 0.0721 E'<subscript>B</subscript></entry> + <entry>219 E'<subscript>Y</subscript> + 16</entry> + <entry>224 P<subscript>B,R</subscript> + 128</entry> + </row> + <row> + <entry><constant>V4L2_COLORSPACE_BT878</constant></entry> + <entry>4</entry> + <entry>Broken Bt878 extents<footnote> + <para>The ubiquitous Bt878 video capture chip +quantizes E'<subscript>Y</subscript> to 238 levels, yielding a range +of Y' = 16 … 253, unlike Rec. 601 Y' = 16 … +235. This is not a typo in the Bt878 documentation, it has been +implemented in silicon. The chroma extents are unclear.</para> + </footnote>, <xref linkend="itu601" /></entry> + <entry>?</entry> + <entry>?</entry> + <entry>?</entry> + <entry>?</entry> + <entry>?</entry> + <entry>0.299 E'<subscript>R</subscript> ++ 0.587 E'<subscript>G</subscript> ++ 0.114 E'<subscript>B</subscript></entry> + <entry><emphasis>237</emphasis> E'<subscript>Y</subscript> + 16</entry> + <entry>224 P<subscript>B,R</subscript> + 128 (probably)</entry> + </row> + <row> + <entry><constant>V4L2_COLORSPACE_470_SYSTEM_M</constant></entry> + <entry>5</entry> + <entry>M/NTSC<footnote> + <para>No identifier exists for M/PAL which uses +the chromaticities of M/NTSC, the remaining parameters are equal to B and +G/PAL.</para> + </footnote> according to <xref linkend="itu470" />, <xref + linkend="itu601" /></entry> + <entry>x = 0.67, y = 0.33</entry> + <entry>x = 0.21, y = 0.71</entry> + <entry>x = 0.14, y = 0.08</entry> + <entry>x = 0.310, y = 0.316, Illuminant C</entry> + <entry>?</entry> + <entry>0.299 E'<subscript>R</subscript> ++ 0.587 E'<subscript>G</subscript> ++ 0.114 E'<subscript>B</subscript></entry> + <entry>219 E'<subscript>Y</subscript> + 16</entry> + <entry>224 P<subscript>B,R</subscript> + 128</entry> + </row> + <row> + <entry><constant>V4L2_COLORSPACE_470_SYSTEM_BG</constant></entry> + <entry>6</entry> + <entry>625-line PAL and SECAM systems according to <xref +linkend="itu470" />, <xref linkend="itu601" /></entry> + <entry>x = 0.64, y = 0.33</entry> + <entry>x = 0.29, y = 0.60</entry> + <entry>x = 0.15, y = 0.06</entry> + <entry>x = 0.313, y = 0.329, +Illuminant D<subscript>65</subscript></entry> + <entry>?</entry> + <entry>0.299 E'<subscript>R</subscript> ++ 0.587 E'<subscript>G</subscript> ++ 0.114 E'<subscript>B</subscript></entry> + <entry>219 E'<subscript>Y</subscript> + 16</entry> + <entry>224 P<subscript>B,R</subscript> + 128</entry> + </row> + <row> + <entry><constant>V4L2_COLORSPACE_JPEG</constant></entry> + <entry>7</entry> + <entry>JPEG Y'CbCr, see <xref linkend="jfif" />, <xref linkend="itu601" /></entry> + <entry>?</entry> + <entry>?</entry> + <entry>?</entry> + <entry>?</entry> + <entry>?</entry> + <entry>0.299 E'<subscript>R</subscript> ++ 0.587 E'<subscript>G</subscript> ++ 0.114 E'<subscript>B</subscript></entry> + <entry>256 E'<subscript>Y</subscript> + 16<footnote> + <para>Note JFIF quantizes +Y'P<subscript>B</subscript>P<subscript>R</subscript> in range [0;+1] and +[-0.5;+0.5] to <emphasis>257</emphasis> levels, however Y'CbCr signals +are still clamped to [0;255].</para> + </footnote></entry> + <entry>256 P<subscript>B,R</subscript> + 128</entry> + </row> + <row> + <entry><constant>V4L2_COLORSPACE_SRGB</constant></entry> + <entry>8</entry> + <entry>[?]</entry> + <entry>x = 0.640, y = 0.330</entry> + <entry>x = 0.300, y = 0.600</entry> + <entry>x = 0.150, y = 0.060</entry> + <entry>x = 0.3127, y = 0.3290, + Illuminant D<subscript>65</subscript></entry> + <entry>E' = 4.5 I for I ≤0.018, +1.099 I<superscript>0.45</superscript> - 0.099 for 0.018 < I</entry> + <entry spanname="spam">n/a</entry> + </row> + </tbody> + </tgroup> + </table> + </section> + + <section id="pixfmt-indexed"> + <title>Indexed Format</title> + + <para>In this format each pixel is represented by an 8 bit index +into a 256 entry ARGB palette. It is intended for <link +linkend="osd">Video Output Overlays</link> only. There are no ioctls to +access the palette, this must be done with ioctls of the Linux framebuffer API.</para> + + <table pgwide="0" frame="none"> + <title>Indexed Image Format</title> + <tgroup cols="37" align="center"> + <colspec colname="id" align="left" /> + <colspec colname="fourcc" /> + <colspec colname="bit" /> + + <colspec colnum="4" colname="b07" align="center" /> + <colspec colnum="5" colname="b06" align="center" /> + <colspec colnum="6" colname="b05" align="center" /> + <colspec colnum="7" colname="b04" align="center" /> + <colspec colnum="8" colname="b03" align="center" /> + <colspec colnum="9" colname="b02" align="center" /> + <colspec colnum="10" colname="b01" align="center" /> + <colspec colnum="11" colname="b00" align="center" /> + + <spanspec namest="b07" nameend="b00" spanname="b0" /> + <spanspec namest="b17" nameend="b10" spanname="b1" /> + <spanspec namest="b27" nameend="b20" spanname="b2" /> + <spanspec namest="b37" nameend="b30" spanname="b3" /> + <thead> + <row> + <entry>Identifier</entry> + <entry>Code</entry> + <entry> </entry> + <entry spanname="b0">Byte 0</entry> + </row> + <row> + <entry> </entry> + <entry> </entry> + <entry>Bit</entry> + <entry>7</entry> + <entry>6</entry> + <entry>5</entry> + <entry>4</entry> + <entry>3</entry> + <entry>2</entry> + <entry>1</entry> + <entry>0</entry> + </row> + </thead> + <tbody valign="top"> + <row id="V4L2-PIX-FMT-PAL8"> + <entry><constant>V4L2_PIX_FMT_PAL8</constant></entry> + <entry>'PAL8'</entry> + <entry></entry> + <entry>i<subscript>7</subscript></entry> + <entry>i<subscript>6</subscript></entry> + <entry>i<subscript>5</subscript></entry> + <entry>i<subscript>4</subscript></entry> + <entry>i<subscript>3</subscript></entry> + <entry>i<subscript>2</subscript></entry> + <entry>i<subscript>1</subscript></entry> + <entry>i<subscript>0</subscript></entry> + </row> + </tbody> + </tgroup> + </table> + </section> + + <section id="pixfmt-rgb"> + <title>RGB Formats</title> + + &sub-packed-rgb; + &sub-sbggr8; + &sub-sgbrg8; + &sub-sgrbg8; + &sub-srggb8; + &sub-sbggr16; + &sub-srggb10; + &sub-srggb10alaw8; + &sub-srggb10dpcm8; + &sub-srggb12; + </section> + + <section id="yuv-formats"> + <title>YUV Formats</title> + + <para>YUV is the format native to TV broadcast and composite video +signals. It separates the brightness information (Y) from the color +information (U and V or Cb and Cr). The color information consists of +red and blue <emphasis>color difference</emphasis> signals, this way +the green component can be reconstructed by subtracting from the +brightness component. See <xref linkend="colorspaces" /> for conversion +examples. YUV was chosen because early television would only transmit +brightness information. To add color in a way compatible with existing +receivers a new signal carrier was added to transmit the color +difference signals. Secondary in the YUV format the U and V components +usually have lower resolution than the Y component. This is an analog +video compression technique taking advantage of a property of the +human visual system, being more sensitive to brightness +information.</para> + + &sub-packed-yuv; + &sub-grey; + &sub-y10; + &sub-y12; + &sub-y10b; + &sub-y16; + &sub-uv8; + &sub-yuyv; + &sub-uyvy; + &sub-yvyu; + &sub-vyuy; + &sub-y41p; + &sub-yuv420; + &sub-yuv420m; + &sub-yvu420m; + &sub-yuv410; + &sub-yuv422p; + &sub-yuv411p; + &sub-nv12; + &sub-nv12m; + &sub-nv12mt; + &sub-nv16; + &sub-nv16m; + &sub-nv24; + &sub-m420; + </section> + + <section> + <title>Compressed Formats</title> + + <table pgwide="1" frame="none" id="compressed-formats"> + <title>Compressed Image Formats</title> + <tgroup cols="3" align="left"> + &cs-def; + <thead> + <row> + <entry>Identifier</entry> + <entry>Code</entry> + <entry>Details</entry> + </row> + </thead> + <tbody valign="top"> + <row id="V4L2-PIX-FMT-JPEG"> + <entry><constant>V4L2_PIX_FMT_JPEG</constant></entry> + <entry>'JPEG'</entry> + <entry>TBD. See also &VIDIOC-G-JPEGCOMP;, + &VIDIOC-S-JPEGCOMP;.</entry> + </row> + <row id="V4L2-PIX-FMT-MPEG"> + <entry><constant>V4L2_PIX_FMT_MPEG</constant></entry> + <entry>'MPEG'</entry> + <entry>MPEG multiplexed stream. The actual format is determined by +extended control <constant>V4L2_CID_MPEG_STREAM_TYPE</constant>, see +<xref linkend="mpeg-control-id" />.</entry> + </row> + <row id="V4L2-PIX-FMT-H264"> + <entry><constant>V4L2_PIX_FMT_H264</constant></entry> + <entry>'H264'</entry> + <entry>H264 video elementary stream with start codes.</entry> + </row> + <row id="V4L2-PIX-FMT-H264-NO-SC"> + <entry><constant>V4L2_PIX_FMT_H264_NO_SC</constant></entry> + <entry>'AVC1'</entry> + <entry>H264 video elementary stream without start codes.</entry> + </row> + <row id="V4L2-PIX-FMT-H264-MVC"> + <entry><constant>V4L2_PIX_FMT_H264_MVC</constant></entry> + <entry>'M264'</entry> + <entry>H264 MVC video elementary stream.</entry> + </row> + <row id="V4L2-PIX-FMT-H263"> + <entry><constant>V4L2_PIX_FMT_H263</constant></entry> + <entry>'H263'</entry> + <entry>H263 video elementary stream.</entry> + </row> + <row id="V4L2-PIX-FMT-MPEG1"> + <entry><constant>V4L2_PIX_FMT_MPEG1</constant></entry> + <entry>'MPG1'</entry> + <entry>MPEG1 video elementary stream.</entry> + </row> + <row id="V4L2-PIX-FMT-MPEG2"> + <entry><constant>V4L2_PIX_FMT_MPEG2</constant></entry> + <entry>'MPG2'</entry> + <entry>MPEG2 video elementary stream.</entry> + </row> + <row id="V4L2-PIX-FMT-MPEG4"> + <entry><constant>V4L2_PIX_FMT_MPEG4</constant></entry> + <entry>'MPG4'</entry> + <entry>MPEG4 video elementary stream.</entry> + </row> + <row id="V4L2-PIX-FMT-XVID"> + <entry><constant>V4L2_PIX_FMT_XVID</constant></entry> + <entry>'XVID'</entry> + <entry>Xvid video elementary stream.</entry> + </row> + <row id="V4L2-PIX-FMT-VC1-ANNEX-G"> + <entry><constant>V4L2_PIX_FMT_VC1_ANNEX_G</constant></entry> + <entry>'VC1G'</entry> + <entry>VC1, SMPTE 421M Annex G compliant stream.</entry> + </row> + <row id="V4L2-PIX-FMT-VC1-ANNEX-L"> + <entry><constant>V4L2_PIX_FMT_VC1_ANNEX_L</constant></entry> + <entry>'VC1L'</entry> + <entry>VC1, SMPTE 421M Annex L compliant stream.</entry> + </row> + <row id="V4L2-PIX-FMT-VP8"> + <entry><constant>V4L2_PIX_FMT_VP8</constant></entry> + <entry>'VP80'</entry> + <entry>VP8 video elementary stream.</entry> + </row> + </tbody> + </tgroup> + </table> + </section> + + <section id="sdr-formats"> + <title>SDR Formats</title> + + <para>These formats are used for <link linkend="sdr">SDR Capture</link> +interface only.</para> + + &sub-sdr-cu08; + &sub-sdr-cu16le; + + </section> + + <section id="pixfmt-reserved"> + <title>Reserved Format Identifiers</title> + + <para>These formats are not defined by this specification, they +are just listed for reference and to avoid naming conflicts. If you +want to register your own format, send an e-mail to the linux-media mailing +list &v4l-ml; for inclusion in the <filename>videodev2.h</filename> +file. If you want to share your format with other developers add a +link to your documentation and send a copy to the linux-media mailing list +for inclusion in this section. If you think your format should be listed +in a standard format section please make a proposal on the linux-media mailing +list.</para> + + <table pgwide="1" frame="none" id="reserved-formats"> + <title>Reserved Image Formats</title> + <tgroup cols="3" align="left"> + &cs-def; + <thead> + <row> + <entry>Identifier</entry> + <entry>Code</entry> + <entry>Details</entry> + </row> + </thead> + <tbody valign="top"> + <row id="V4L2-PIX-FMT-DV"> + <entry><constant>V4L2_PIX_FMT_DV</constant></entry> + <entry>'dvsd'</entry> + <entry>unknown</entry> + </row> + <row id="V4L2-PIX-FMT-ET61X251"> + <entry><constant>V4L2_PIX_FMT_ET61X251</constant></entry> + <entry>'E625'</entry> + <entry>Compressed format of the ET61X251 driver.</entry> + </row> + <row id="V4L2-PIX-FMT-HI240"> + <entry><constant>V4L2_PIX_FMT_HI240</constant></entry> + <entry>'HI24'</entry> + <entry><para>8 bit RGB format used by the BTTV driver.</para></entry> + </row> + <row id="V4L2-PIX-FMT-HM12"> + <entry><constant>V4L2_PIX_FMT_HM12</constant></entry> + <entry>'HM12'</entry> + <entry><para>YUV 4:2:0 format used by the +IVTV driver, <ulink url="http://www.ivtvdriver.org/"> +http://www.ivtvdriver.org/</ulink></para><para>The format is documented in the +kernel sources in the file <filename>Documentation/video4linux/cx2341x/README.hm12</filename> +</para></entry> + </row> + <row id="V4L2-PIX-FMT-CPIA1"> + <entry><constant>V4L2_PIX_FMT_CPIA1</constant></entry> + <entry>'CPIA'</entry> + <entry>YUV format used by the gspca cpia1 driver.</entry> + </row> + <row id="V4L2-PIX-FMT-JPGL"> + <entry><constant>V4L2_PIX_FMT_JPGL</constant></entry> + <entry>'JPGL'</entry> + <entry>JPEG-Light format (Pegasus Lossless JPEG) + used in Divio webcams NW 80x.</entry> + </row> + <row id="V4L2-PIX-FMT-SPCA501"> + <entry><constant>V4L2_PIX_FMT_SPCA501</constant></entry> + <entry>'S501'</entry> + <entry>YUYV per line used by the gspca driver.</entry> + </row> + <row id="V4L2-PIX-FMT-SPCA505"> + <entry><constant>V4L2_PIX_FMT_SPCA505</constant></entry> + <entry>'S505'</entry> + <entry>YYUV per line used by the gspca driver.</entry> + </row> + <row id="V4L2-PIX-FMT-SPCA508"> + <entry><constant>V4L2_PIX_FMT_SPCA508</constant></entry> + <entry>'S508'</entry> + <entry>YUVY per line used by the gspca driver.</entry> + </row> + <row id="V4L2-PIX-FMT-SPCA561"> + <entry><constant>V4L2_PIX_FMT_SPCA561</constant></entry> + <entry>'S561'</entry> + <entry>Compressed GBRG Bayer format used by the gspca driver.</entry> + </row> + <row id="V4L2-PIX-FMT-PAC207"> + <entry><constant>V4L2_PIX_FMT_PAC207</constant></entry> + <entry>'P207'</entry> + <entry>Compressed BGGR Bayer format used by the gspca driver.</entry> + </row> + <row id="V4L2-PIX-FMT-MR97310A"> + <entry><constant>V4L2_PIX_FMT_MR97310A</constant></entry> + <entry>'M310'</entry> + <entry>Compressed BGGR Bayer format used by the gspca driver.</entry> + </row> + <row id="V4L2-PIX-FMT-JL2005BCD"> + <entry><constant>V4L2_PIX_FMT_JL2005BCD</constant></entry> + <entry>'JL20'</entry> + <entry>JPEG compressed RGGB Bayer format used by the gspca driver.</entry> + </row> + <row id="V4L2-PIX-FMT-OV511"> + <entry><constant>V4L2_PIX_FMT_OV511</constant></entry> + <entry>'O511'</entry> + <entry>OV511 JPEG format used by the gspca driver.</entry> + </row> + <row id="V4L2-PIX-FMT-OV518"> + <entry><constant>V4L2_PIX_FMT_OV518</constant></entry> + <entry>'O518'</entry> + <entry>OV518 JPEG format used by the gspca driver.</entry> + </row> + <row id="V4L2-PIX-FMT-PJPG"> + <entry><constant>V4L2_PIX_FMT_PJPG</constant></entry> + <entry>'PJPG'</entry> + <entry>Pixart 73xx JPEG format used by the gspca driver.</entry> + </row> + <row id="V4L2-PIX-FMT-SE401"> + <entry><constant>V4L2_PIX_FMT_SE401</constant></entry> + <entry>'S401'</entry> + <entry>Compressed RGB format used by the gspca se401 driver</entry> + </row> + <row id="V4L2-PIX-FMT-SQ905C"> + <entry><constant>V4L2_PIX_FMT_SQ905C</constant></entry> + <entry>'905C'</entry> + <entry>Compressed RGGB bayer format used by the gspca driver.</entry> + </row> + <row id="V4L2-PIX-FMT-MJPEG"> + <entry><constant>V4L2_PIX_FMT_MJPEG</constant></entry> + <entry>'MJPG'</entry> + <entry>Compressed format used by the Zoran driver</entry> + </row> + <row id="V4L2-PIX-FMT-PWC1"> + <entry><constant>V4L2_PIX_FMT_PWC1</constant></entry> + <entry>'PWC1'</entry> + <entry>Compressed format of the PWC driver.</entry> + </row> + <row id="V4L2-PIX-FMT-PWC2"> + <entry><constant>V4L2_PIX_FMT_PWC2</constant></entry> + <entry>'PWC2'</entry> + <entry>Compressed format of the PWC driver.</entry> + </row> + <row id="V4L2-PIX-FMT-SN9C10X"> + <entry><constant>V4L2_PIX_FMT_SN9C10X</constant></entry> + <entry>'S910'</entry> + <entry>Compressed format of the SN9C102 driver.</entry> + </row> + <row id="V4L2-PIX-FMT-SN9C20X-I420"> + <entry><constant>V4L2_PIX_FMT_SN9C20X_I420</constant></entry> + <entry>'S920'</entry> + <entry>YUV 4:2:0 format of the gspca sn9c20x driver.</entry> + </row> + <row id="V4L2-PIX-FMT-SN9C2028"> + <entry><constant>V4L2_PIX_FMT_SN9C2028</constant></entry> + <entry>'SONX'</entry> + <entry>Compressed GBRG bayer format of the gspca sn9c2028 driver.</entry> + </row> + <row id="V4L2-PIX-FMT-STV0680"> + <entry><constant>V4L2_PIX_FMT_STV0680</constant></entry> + <entry>'S680'</entry> + <entry>Bayer format of the gspca stv0680 driver.</entry> + </row> + <row id="V4L2-PIX-FMT-WNVA"> + <entry><constant>V4L2_PIX_FMT_WNVA</constant></entry> + <entry>'WNVA'</entry> + <entry><para>Used by the Winnov Videum driver, <ulink +url="http://www.thedirks.org/winnov/"> +http://www.thedirks.org/winnov/</ulink></para></entry> + </row> + <row id="V4L2-PIX-FMT-TM6000"> + <entry><constant>V4L2_PIX_FMT_TM6000</constant></entry> + <entry>'TM60'</entry> + <entry><para>Used by Trident tm6000</para></entry> + </row> + <row id="V4L2-PIX-FMT-CIT-YYVYUY"> + <entry><constant>V4L2_PIX_FMT_CIT_YYVYUY</constant></entry> + <entry>'CITV'</entry> + <entry><para>Used by xirlink CIT, found at IBM webcams.</para> + <para>Uses one line of Y then 1 line of VYUY</para> + </entry> + </row> + <row id="V4L2-PIX-FMT-KONICA420"> + <entry><constant>V4L2_PIX_FMT_KONICA420</constant></entry> + <entry>'KONI'</entry> + <entry><para>Used by Konica webcams.</para> + <para>YUV420 planar in blocks of 256 pixels.</para> + </entry> + </row> + <row id="V4L2-PIX-FMT-YYUV"> + <entry><constant>V4L2_PIX_FMT_YYUV</constant></entry> + <entry>'YYUV'</entry> + <entry>unknown</entry> + </row> + <row id="V4L2-PIX-FMT-Y4"> + <entry><constant>V4L2_PIX_FMT_Y4</constant></entry> + <entry>'Y04 '</entry> + <entry>Old 4-bit greyscale format. Only the most significant 4 bits of each byte are used, +the other bits are set to 0.</entry> + </row> + <row id="V4L2-PIX-FMT-Y6"> + <entry><constant>V4L2_PIX_FMT_Y6</constant></entry> + <entry>'Y06 '</entry> + <entry>Old 6-bit greyscale format. Only the most significant 6 bits of each byte are used, +the other bits are set to 0.</entry> + </row> + <row id="V4L2-PIX-FMT-S5C-UYVY-JPG"> + <entry><constant>V4L2_PIX_FMT_S5C_UYVY_JPG</constant></entry> + <entry>'S5CI'</entry> + <entry>Two-planar format used by Samsung S5C73MX cameras. The +first plane contains interleaved JPEG and UYVY image data, followed by meta data +in form of an array of offsets to the UYVY data blocks. The actual pointer array +follows immediately the interleaved JPEG/UYVY data, the number of entries in +this array equals the height of the UYVY image. Each entry is a 4-byte unsigned +integer in big endian order and it's an offset to a single pixel line of the +UYVY image. The first plane can start either with JPEG or UYVY data chunk. The +size of a single UYVY block equals the UYVY image's width multiplied by 2. The +size of a JPEG chunk depends on the image and can vary with each line. +<para>The second plane, at an offset of 4084 bytes, contains a 4-byte offset to +the pointer array in the first plane. This offset is followed by a 4-byte value +indicating size of the pointer array. All numbers in the second plane are also +in big endian order. Remaining data in the second plane is undefined. The +information in the second plane allows to easily find location of the pointer +array, which can be different for each frame. The size of the pointer array is +constant for given UYVY image height.</para> +<para>In order to extract UYVY and JPEG frames an application can initially set +a data pointer to the start of first plane and then add an offset from the first +entry of the pointers table. Such a pointer indicates start of an UYVY image +pixel line. Whole UYVY line can be copied to a separate buffer. These steps +should be repeated for each line, i.e. the number of entries in the pointer +array. Anything what's in between the UYVY lines is JPEG data and should be +concatenated to form the JPEG stream. </para> +</entry> + </row> + </tbody> + </tgroup> + </table> + </section> diff --git a/Documentation/DocBook/media/v4l/planar-apis.xml b/Documentation/DocBook/media/v4l/planar-apis.xml new file mode 100644 index 00000000000..878ce204048 --- /dev/null +++ b/Documentation/DocBook/media/v4l/planar-apis.xml @@ -0,0 +1,62 @@ +<section id="planar-apis"> + <title>Single- and multi-planar APIs</title> + + <para>Some devices require data for each input or output video frame + to be placed in discontiguous memory buffers. In such cases, one + video frame has to be addressed using more than one memory address, i.e. one + pointer per "plane". A plane is a sub-buffer of the current frame. For + examples of such formats see <xref linkend="pixfmt" />.</para> + + <para>Initially, V4L2 API did not support multi-planar buffers and a set of + extensions has been introduced to handle them. Those extensions constitute + what is being referred to as the "multi-planar API".</para> + + <para>Some of the V4L2 API calls and structures are interpreted differently, + depending on whether single- or multi-planar API is being used. An application + can choose whether to use one or the other by passing a corresponding buffer + type to its ioctl calls. Multi-planar versions of buffer types are suffixed + with an `_MPLANE' string. For a list of available multi-planar buffer types + see &v4l2-buf-type;. + </para> + + <section> + <title>Multi-planar formats</title> + <para>Multi-planar API introduces new multi-planar formats. Those formats + use a separate set of FourCC codes. It is important to distinguish between + the multi-planar API and a multi-planar format. Multi-planar API calls can + handle all single-planar formats as well (as long as they are passed in + multi-planar API structures), while the single-planar API cannot + handle multi-planar formats.</para> + </section> + + <section> + <title>Calls that distinguish between single and multi-planar APIs</title> + <variablelist> + <varlistentry> + <term>&VIDIOC-QUERYCAP;</term> + <listitem><para>Two additional multi-planar capabilities are added. They can + be set together with non-multi-planar ones for devices that handle + both single- and multi-planar formats.</para></listitem> + </varlistentry> + <varlistentry> + <term>&VIDIOC-G-FMT;, &VIDIOC-S-FMT;, &VIDIOC-TRY-FMT;</term> + <listitem><para>New structures for describing multi-planar formats are added: + &v4l2-pix-format-mplane; and &v4l2-plane-pix-format;. Drivers may + define new multi-planar formats, which have distinct FourCC codes from + the existing single-planar ones.</para> + </listitem> + </varlistentry> + <varlistentry> + <term>&VIDIOC-QBUF;, &VIDIOC-DQBUF;, &VIDIOC-QUERYBUF;</term> + <listitem><para>A new &v4l2-plane; structure for describing planes is added. + Arrays of this structure are passed in the new + <structfield>m.planes</structfield> field of &v4l2-buffer;.</para> + </listitem> + </varlistentry> + <varlistentry> + <term>&VIDIOC-REQBUFS;</term> + <listitem><para>Will allocate multi-planar buffers as requested.</para></listitem> + </varlistentry> + </variablelist> + </section> +</section> diff --git a/Documentation/DocBook/media/v4l/remote_controllers.xml b/Documentation/DocBook/media/v4l/remote_controllers.xml new file mode 100644 index 00000000000..5124a6c4daa --- /dev/null +++ b/Documentation/DocBook/media/v4l/remote_controllers.xml @@ -0,0 +1,320 @@ +<partinfo> +<authorgroup> +<author> +<firstname>Mauro</firstname> +<surname>Chehab</surname> +<othername role="mi">Carvalho</othername> +<affiliation><address><email>m.chehab@samsung.com</email></address></affiliation> +<contrib>Initial version.</contrib> +</author> +</authorgroup> +<copyright> + <year>2009-2014</year> + <holder>Mauro Carvalho Chehab</holder> +</copyright> + +<revhistory> +<!-- Put document revisions here, newest first. --> +<revision> +<revnumber>3.15</revnumber> +<date>2014-02-06</date> +<authorinitials>mcc</authorinitials> +<revremark>Added the interface description and the RC sysfs class description.</revremark> +</revision> +<revision> +<revnumber>1.0</revnumber> +<date>2009-09-06</date> +<authorinitials>mcc</authorinitials> +<revremark>Initial revision</revremark> +</revision> +</revhistory> +</partinfo> + + <title>Remote Controller API</title> + <chapter id="remote_controllers"> + +<title>Remote Controllers</title> + +<section id="Remote_controllers_Intro"> +<title>Introduction</title> + +<para>Currently, most analog and digital devices have a Infrared input for remote controllers. Each +manufacturer has their own type of control. It is not rare for the same manufacturer to ship different +types of controls, depending on the device.</para> +<para>A Remote Controller interface is mapped as a normal evdev/input interface, just like a keyboard or a mouse. +So, it uses all ioctls already defined for any other input devices.</para> +<para>However, remove controllers are more flexible than a normal input device, as the IR +receiver (and/or transmitter) can be used in conjunction with a wide variety of different IR remotes.</para> +<para>In order to allow flexibility, the Remote Controller subsystem allows controlling the +RC-specific attributes via <link linkend="remote_controllers_sysfs_nodes">the sysfs class nodes</link>.</para> +</section> + +<section id="remote_controllers_sysfs_nodes"> +<title>Remote Controller's sysfs nodes</title> +<para>As defined at <constant>Documentation/ABI/testing/sysfs-class-rc</constant>, those are the sysfs nodes that control the Remote Controllers:</para> + +<section id="sys_class_rc"> +<title>/sys/class/rc/</title> +<para>The <constant>/sys/class/rc/</constant> class sub-directory belongs to the Remote Controller +core and provides a sysfs interface for configuring infrared remote controller receivers. +</para> + +</section> +<section id="sys_class_rc_rcN"> +<title>/sys/class/rc/rcN/</title> +<para>A <constant>/sys/class/rc/rcN</constant> directory is created for each remote + control receiver device where N is the number of the receiver.</para> + +</section> +<section id="sys_class_rc_rcN_protocols"> +<title>/sys/class/rc/rcN/protocols</title> +<para>Reading this file returns a list of available protocols, something like:</para> +<para><constant>rc5 [rc6] nec jvc [sony]</constant></para> +<para>Enabled protocols are shown in [] brackets.</para> +<para>Writing "+proto" will add a protocol to the list of enabled protocols.</para> +<para>Writing "-proto" will remove a protocol from the list of enabled protocols.</para> +<para>Writing "proto" will enable only "proto".</para> +<para>Writing "none" will disable all protocols.</para> +<para>Write fails with EINVAL if an invalid protocol combination or unknown protocol name is used.</para> + +</section> +<section id="sys_class_rc_rcN_filter"> +<title>/sys/class/rc/rcN/filter</title> +<para>Sets the scancode filter expected value.</para> +<para>Use in combination with <constant>/sys/class/rc/rcN/filter_mask</constant> to set the +expected value of the bits set in the filter mask. +If the hardware supports it then scancodes which do not match +the filter will be ignored. Otherwise the write will fail with +an error.</para> +<para>This value may be reset to 0 if the current protocol is altered.</para> + +</section> +<section id="sys_class_rc_rcN_filter_mask"> +<title>/sys/class/rc/rcN/filter_mask</title> +<para>Sets the scancode filter mask of bits to compare. +Use in combination with <constant>/sys/class/rc/rcN/filter</constant> to set the bits +of the scancode which should be compared against the expected +value. A value of 0 disables the filter to allow all valid +scancodes to be processed.</para> +<para>If the hardware supports it then scancodes which do not match +the filter will be ignored. Otherwise the write will fail with +an error.</para> +<para>This value may be reset to 0 if the current protocol is altered.</para> + +</section> +<section id="sys_class_rc_rcN_wakeup_protocols"> +<title>/sys/class/rc/rcN/wakeup_protocols</title> +<para>Reading this file returns a list of available protocols to use for the +wakeup filter, something like:</para> +<para><constant>rc5 rc6 nec jvc [sony]</constant></para> +<para>The enabled wakeup protocol is shown in [] brackets.</para> +<para>Writing "+proto" will add a protocol to the list of enabled wakeup +protocols.</para> +<para>Writing "-proto" will remove a protocol from the list of enabled wakeup +protocols.</para> +<para>Writing "proto" will use "proto" for wakeup events.</para> +<para>Writing "none" will disable wakeup.</para> +<para>Write fails with EINVAL if an invalid protocol combination or unknown +protocol name is used, or if wakeup is not supported by the hardware.</para> + +</section> +<section id="sys_class_rc_rcN_wakeup_filter"> +<title>/sys/class/rc/rcN/wakeup_filter</title> +<para>Sets the scancode wakeup filter expected value. +Use in combination with <constant>/sys/class/rc/rcN/wakeup_filter_mask</constant> to +set the expected value of the bits set in the wakeup filter mask +to trigger a system wake event.</para> +<para>If the hardware supports it and wakeup_filter_mask is not 0 then +scancodes which match the filter will wake the system from e.g. +suspend to RAM or power off. +Otherwise the write will fail with an error.</para> +<para>This value may be reset to 0 if the wakeup protocol is altered.</para> + +</section> +<section id="sys_class_rc_rcN_wakeup_filter_mask"> +<title>/sys/class/rc/rcN/wakeup_filter_mask</title> +<para>Sets the scancode wakeup filter mask of bits to compare. +Use in combination with <constant>/sys/class/rc/rcN/wakeup_filter</constant> to set +the bits of the scancode which should be compared against the +expected value to trigger a system wake event.</para> +<para>If the hardware supports it and wakeup_filter_mask is not 0 then +scancodes which match the filter will wake the system from e.g. +suspend to RAM or power off. +Otherwise the write will fail with an error.</para> +<para>This value may be reset to 0 if the wakeup protocol is altered.</para> +</section> +</section> + +<section id="Remote_controllers_tables"> +<title>Remote controller tables</title> +<para>Unfortunately, for several years, there was no effort to create uniform IR keycodes for +different devices. This caused the same IR keyname to be mapped completely differently on +different IR devices. This resulted that the same IR keyname to be mapped completely different on +different IR's. Due to that, V4L2 API now specifies a standard for mapping Media keys on IR.</para> +<para>This standard should be used by both V4L/DVB drivers and userspace applications</para> +<para>The modules register the remote as keyboard within the linux input layer. This means that the IR key strokes will look like normal keyboard key strokes (if CONFIG_INPUT_KEYBOARD is enabled). Using the event devices (CONFIG_INPUT_EVDEV) it is possible for applications to access the remote via /dev/input/event devices.</para> + +<table pgwide="1" frame="none" id="rc_standard_keymap"> +<title>IR default keymapping</title> +<tgroup cols="3"> +&cs-str; +<tbody valign="top"> +<row> +<entry>Key code</entry> +<entry>Meaning</entry> +<entry>Key examples on IR</entry> +</row> + +<row><entry><emphasis role="bold">Numeric keys</emphasis></entry></row> + +<row><entry><constant>KEY_0</constant></entry><entry>Keyboard digit 0</entry><entry>0</entry></row> +<row><entry><constant>KEY_1</constant></entry><entry>Keyboard digit 1</entry><entry>1</entry></row> +<row><entry><constant>KEY_2</constant></entry><entry>Keyboard digit 2</entry><entry>2</entry></row> +<row><entry><constant>KEY_3</constant></entry><entry>Keyboard digit 3</entry><entry>3</entry></row> +<row><entry><constant>KEY_4</constant></entry><entry>Keyboard digit 4</entry><entry>4</entry></row> +<row><entry><constant>KEY_5</constant></entry><entry>Keyboard digit 5</entry><entry>5</entry></row> +<row><entry><constant>KEY_6</constant></entry><entry>Keyboard digit 6</entry><entry>6</entry></row> +<row><entry><constant>KEY_7</constant></entry><entry>Keyboard digit 7</entry><entry>7</entry></row> +<row><entry><constant>KEY_8</constant></entry><entry>Keyboard digit 8</entry><entry>8</entry></row> +<row><entry><constant>KEY_9</constant></entry><entry>Keyboard digit 9</entry><entry>9</entry></row> + +<row><entry><emphasis role="bold">Movie play control</emphasis></entry></row> + +<row><entry><constant>KEY_FORWARD</constant></entry><entry>Instantly advance in time</entry><entry>>> / FORWARD</entry></row> +<row><entry><constant>KEY_BACK</constant></entry><entry>Instantly go back in time</entry><entry><<< / BACK</entry></row> +<row><entry><constant>KEY_FASTFORWARD</constant></entry><entry>Play movie faster</entry><entry>>>> / FORWARD</entry></row> +<row><entry><constant>KEY_REWIND</constant></entry><entry>Play movie back</entry><entry>REWIND / BACKWARD</entry></row> +<row><entry><constant>KEY_NEXT</constant></entry><entry>Select next chapter / sub-chapter / interval</entry><entry>NEXT / SKIP</entry></row> +<row><entry><constant>KEY_PREVIOUS</constant></entry><entry>Select previous chapter / sub-chapter / interval</entry><entry><< / PREV / PREVIOUS</entry></row> +<row><entry><constant>KEY_AGAIN</constant></entry><entry>Repeat the video or a video interval</entry><entry>REPEAT / LOOP / RECALL</entry></row> +<row><entry><constant>KEY_PAUSE</constant></entry><entry>Pause sroweam</entry><entry>PAUSE / FREEZE</entry></row> +<row><entry><constant>KEY_PLAY</constant></entry><entry>Play movie at the normal timeshift</entry><entry>NORMAL TIMESHIFT / LIVE / ></entry></row> +<row><entry><constant>KEY_PLAYPAUSE</constant></entry><entry>Alternate between play and pause</entry><entry>PLAY / PAUSE</entry></row> +<row><entry><constant>KEY_STOP</constant></entry><entry>Stop sroweam</entry><entry>STOP</entry></row> +<row><entry><constant>KEY_RECORD</constant></entry><entry>Start/stop recording sroweam</entry><entry>CAPTURE / REC / RECORD/PAUSE</entry></row> +<row><entry><constant>KEY_CAMERA</constant></entry><entry>Take a picture of the image</entry><entry>CAMERA ICON / CAPTURE / SNAPSHOT</entry></row> +<row><entry><constant>KEY_SHUFFLE</constant></entry><entry>Enable shuffle mode</entry><entry>SHUFFLE</entry></row> +<row><entry><constant>KEY_TIME</constant></entry><entry>Activate time shift mode</entry><entry>TIME SHIFT</entry></row> +<row><entry><constant>KEY_TITLE</constant></entry><entry>Allow changing the chapter</entry><entry>CHAPTER</entry></row> +<row><entry><constant>KEY_SUBTITLE</constant></entry><entry>Allow changing the subtitle</entry><entry>SUBTITLE</entry></row> + +<row><entry><emphasis role="bold">Image control</emphasis></entry></row> + +<row><entry><constant>KEY_BRIGHTNESSDOWN</constant></entry><entry>Decrease Brightness</entry><entry>BRIGHTNESS DECREASE</entry></row> +<row><entry><constant>KEY_BRIGHTNESSUP</constant></entry><entry>Increase Brightness</entry><entry>BRIGHTNESS INCREASE</entry></row> + +<row><entry><constant>KEY_ANGLE</constant></entry><entry>Switch video camera angle (on videos with more than one angle stored)</entry><entry>ANGLE / SWAP</entry></row> +<row><entry><constant>KEY_EPG</constant></entry><entry>Open the Elecrowonic Play Guide (EPG)</entry><entry>EPG / GUIDE</entry></row> +<row><entry><constant>KEY_TEXT</constant></entry><entry>Activate/change closed caption mode</entry><entry>CLOSED CAPTION/TELETEXT / DVD TEXT / TELETEXT / TTX</entry></row> + +<row><entry><emphasis role="bold">Audio control</emphasis></entry></row> + +<row><entry><constant>KEY_AUDIO</constant></entry><entry>Change audio source</entry><entry>AUDIO SOURCE / AUDIO / MUSIC</entry></row> +<row><entry><constant>KEY_MUTE</constant></entry><entry>Mute/unmute audio</entry><entry>MUTE / DEMUTE / UNMUTE</entry></row> +<row><entry><constant>KEY_VOLUMEDOWN</constant></entry><entry>Decrease volume</entry><entry>VOLUME- / VOLUME DOWN</entry></row> +<row><entry><constant>KEY_VOLUMEUP</constant></entry><entry>Increase volume</entry><entry>VOLUME+ / VOLUME UP</entry></row> +<row><entry><constant>KEY_MODE</constant></entry><entry>Change sound mode</entry><entry>MONO/STEREO</entry></row> +<row><entry><constant>KEY_LANGUAGE</constant></entry><entry>Select Language</entry><entry>1ST / 2ND LANGUAGE / DVD LANG / MTS/SAP / MTS SEL</entry></row> + +<row><entry><emphasis role="bold">Channel control</emphasis></entry></row> + +<row><entry><constant>KEY_CHANNEL</constant></entry><entry>Go to the next favorite channel</entry><entry>ALT / CHANNEL / CH SURFING / SURF / FAV</entry></row> +<row><entry><constant>KEY_CHANNELDOWN</constant></entry><entry>Decrease channel sequencially</entry><entry>CHANNEL - / CHANNEL DOWN / DOWN</entry></row> +<row><entry><constant>KEY_CHANNELUP</constant></entry><entry>Increase channel sequencially</entry><entry>CHANNEL + / CHANNEL UP / UP</entry></row> +<row><entry><constant>KEY_DIGITS</constant></entry><entry>Use more than one digit for channel</entry><entry>PLUS / 100/ 1xx / xxx / -/-- / Single Double Triple Digit</entry></row> +<row><entry><constant>KEY_SEARCH</constant></entry><entry>Start channel autoscan</entry><entry>SCAN / AUTOSCAN</entry></row> + +<row><entry><emphasis role="bold">Colored keys</emphasis></entry></row> + +<row><entry><constant>KEY_BLUE</constant></entry><entry>IR Blue key</entry><entry>BLUE</entry></row> +<row><entry><constant>KEY_GREEN</constant></entry><entry>IR Green Key</entry><entry>GREEN</entry></row> +<row><entry><constant>KEY_RED</constant></entry><entry>IR Red key</entry><entry>RED</entry></row> +<row><entry><constant>KEY_YELLOW</constant></entry><entry>IR Yellow key</entry><entry> YELLOW</entry></row> + +<row><entry><emphasis role="bold">Media selection</emphasis></entry></row> + +<row><entry><constant>KEY_CD</constant></entry><entry>Change input source to Compact Disc</entry><entry>CD</entry></row> +<row><entry><constant>KEY_DVD</constant></entry><entry>Change input to DVD</entry><entry>DVD / DVD MENU</entry></row> +<row><entry><constant>KEY_EJECTCLOSECD</constant></entry><entry>Open/close the CD/DVD player</entry><entry>-> ) / CLOSE / OPEN</entry></row> + +<row><entry><constant>KEY_MEDIA</constant></entry><entry>Turn on/off Media application</entry><entry>PC/TV / TURN ON/OFF APP</entry></row> +<row><entry><constant>KEY_PC</constant></entry><entry>Selects from TV to PC</entry><entry>PC</entry></row> +<row><entry><constant>KEY_RADIO</constant></entry><entry>Put into AM/FM radio mode</entry><entry>RADIO / TV/FM / TV/RADIO / FM / FM/RADIO</entry></row> +<row><entry><constant>KEY_TV</constant></entry><entry>Select tv mode</entry><entry>TV / LIVE TV</entry></row> +<row><entry><constant>KEY_TV2</constant></entry><entry>Select Cable mode</entry><entry>AIR/CBL</entry></row> +<row><entry><constant>KEY_VCR</constant></entry><entry>Select VCR mode</entry><entry>VCR MODE / DTR</entry></row> +<row><entry><constant>KEY_VIDEO</constant></entry><entry>Alternate between input modes</entry><entry>SOURCE / SELECT / DISPLAY / SWITCH INPUTS / VIDEO</entry></row> + +<row><entry><emphasis role="bold">Power control</emphasis></entry></row> + +<row><entry><constant>KEY_POWER</constant></entry><entry>Turn on/off computer</entry><entry>SYSTEM POWER / COMPUTER POWER</entry></row> +<row><entry><constant>KEY_POWER2</constant></entry><entry>Turn on/off application</entry><entry>TV ON/OFF / POWER</entry></row> +<row><entry><constant>KEY_SLEEP</constant></entry><entry>Activate sleep timer</entry><entry>SLEEP / SLEEP TIMER</entry></row> +<row><entry><constant>KEY_SUSPEND</constant></entry><entry>Put computer into suspend mode</entry><entry>STANDBY / SUSPEND</entry></row> + +<row><entry><emphasis role="bold">Window control</emphasis></entry></row> + +<row><entry><constant>KEY_CLEAR</constant></entry><entry>Stop sroweam and return to default input video/audio</entry><entry>CLEAR / RESET / BOSS KEY</entry></row> +<row><entry><constant>KEY_CYCLEWINDOWS</constant></entry><entry>Minimize windows and move to the next one</entry><entry>ALT-TAB / MINIMIZE / DESKTOP</entry></row> +<row><entry><constant>KEY_FAVORITES</constant></entry><entry>Open the favorites sroweam window</entry><entry>TV WALL / Favorites</entry></row> +<row><entry><constant>KEY_MENU</constant></entry><entry>Call application menu</entry><entry>2ND CONTROLS (USA: MENU) / DVD/MENU / SHOW/HIDE CTRL</entry></row> +<row><entry><constant>KEY_NEW</constant></entry><entry>Open/Close Picture in Picture</entry><entry>PIP</entry></row> +<row><entry><constant>KEY_OK</constant></entry><entry>Send a confirmation code to application</entry><entry>OK / ENTER / RETURN</entry></row> +<row><entry><constant>KEY_SCREEN</constant></entry><entry>Select screen aspect ratio</entry><entry>4:3 16:9 SELECT</entry></row> +<row><entry><constant>KEY_ZOOM</constant></entry><entry>Put device into zoom/full screen mode</entry><entry>ZOOM / FULL SCREEN / ZOOM+ / HIDE PANNEL / SWITCH</entry></row> + +<row><entry><emphasis role="bold">Navigation keys</emphasis></entry></row> + +<row><entry><constant>KEY_ESC</constant></entry><entry>Cancel current operation</entry><entry>CANCEL / BACK</entry></row> +<row><entry><constant>KEY_HELP</constant></entry><entry>Open a Help window</entry><entry>HELP</entry></row> +<row><entry><constant>KEY_HOMEPAGE</constant></entry><entry>Navigate to Homepage</entry><entry>HOME</entry></row> +<row><entry><constant>KEY_INFO</constant></entry><entry>Open On Screen Display</entry><entry>DISPLAY INFORMATION / OSD</entry></row> +<row><entry><constant>KEY_WWW</constant></entry><entry>Open the default browser</entry><entry>WEB</entry></row> +<row><entry><constant>KEY_UP</constant></entry><entry>Up key</entry><entry>UP</entry></row> +<row><entry><constant>KEY_DOWN</constant></entry><entry>Down key</entry><entry>DOWN</entry></row> +<row><entry><constant>KEY_LEFT</constant></entry><entry>Left key</entry><entry>LEFT</entry></row> +<row><entry><constant>KEY_RIGHT</constant></entry><entry>Right key</entry><entry>RIGHT</entry></row> + +<row><entry><emphasis role="bold">Miscellaneous keys</emphasis></entry></row> + +<row><entry><constant>KEY_DOT</constant></entry><entry>Return a dot</entry><entry>.</entry></row> +<row><entry><constant>KEY_FN</constant></entry><entry>Select a function</entry><entry>FUNCTION</entry></row> + +</tbody> +</tgroup> +</table> + +<para>It should be noticed that, sometimes, there some fundamental missing keys at some cheaper IR's. Due to that, it is recommended to:</para> + +<table pgwide="1" frame="none" id="rc_keymap_notes"> +<title>Notes</title> +<tgroup cols="1"> +&cs-str; +<tbody valign="top"> +<row> +<entry>On simpler IR's, without separate channel keys, you need to map UP as <constant>KEY_CHANNELUP</constant></entry> +</row><row> +<entry>On simpler IR's, without separate channel keys, you need to map DOWN as <constant>KEY_CHANNELDOWN</constant></entry> +</row><row> +<entry>On simpler IR's, without separate volume keys, you need to map LEFT as <constant>KEY_VOLUMEDOWN</constant></entry> +</row><row> +<entry>On simpler IR's, without separate volume keys, you need to map RIGHT as <constant>KEY_VOLUMEUP</constant></entry> +</row> +</tbody> +</tgroup> +</table> + +</section> + +<section id="Remote_controllers_table_change"> +<title>Changing default Remote Controller mappings</title> +<para>The event interface provides two ioctls to be used against +the /dev/input/event device, to allow changing the default +keymapping.</para> + +<para>This program demonstrates how to replace the keymap tables.</para> +&sub-keytable-c; +</section> + +&sub-lirc_device_interface; +</chapter> diff --git a/Documentation/DocBook/media/v4l/selection-api.xml b/Documentation/DocBook/media/v4l/selection-api.xml new file mode 100644 index 00000000000..4c238ce068b --- /dev/null +++ b/Documentation/DocBook/media/v4l/selection-api.xml @@ -0,0 +1,325 @@ +<section id="selection-api"> + + <title>Experimental API for cropping, composing and scaling</title> + + <note> + <title>Experimental</title> + + <para>This is an <link linkend="experimental">experimental</link> +interface and may change in the future.</para> + </note> + + <section> + <title>Introduction</title> + +<para>Some video capture devices can sample a subsection of a picture and +shrink or enlarge it to an image of arbitrary size. Next, the devices can +insert the image into larger one. Some video output devices can crop part of an +input image, scale it up or down and insert it at an arbitrary scan line and +horizontal offset into a video signal. We call these abilities cropping, +scaling and composing.</para> + +<para>On a video <emphasis>capture</emphasis> device the source is a video +signal, and the cropping target determine the area actually sampled. The sink +is an image stored in a memory buffer. The composing area specifies which part +of the buffer is actually written to by the hardware. </para> + +<para>On a video <emphasis>output</emphasis> device the source is an image in a +memory buffer, and the cropping target is a part of an image to be shown on a +display. The sink is the display or the graphics screen. The application may +select the part of display where the image should be displayed. The size and +position of such a window is controlled by the compose target.</para> + +<para>Rectangles for all cropping and composing targets are defined even if the +device does supports neither cropping nor composing. Their size and position +will be fixed in such a case. If the device does not support scaling then the +cropping and composing rectangles have the same size.</para> + + </section> + + <section> + <title>Selection targets</title> + + <para> + <figure id="sel-targets-capture"> + <title>Cropping and composing targets</title> + <mediaobject> + <imageobject> + <imagedata fileref="selection.png" format="PNG" /> + </imageobject> + <textobject> + <phrase>Targets used by a cropping, composing and scaling + process</phrase> + </textobject> + </mediaobject> + </figure> + </para> + + <para>See <xref linkend="v4l2-selection-targets" /> for more + information.</para> + </section> + + <section> + + <title>Configuration</title> + +<para>Applications can use the <link linkend="vidioc-g-selection">selection +API</link> to select an area in a video signal or a buffer, and to query for +default settings and hardware limits.</para> + +<para>Video hardware can have various cropping, composing and scaling +limitations. It may only scale up or down, support only discrete scaling +factors, or have different scaling abilities in the horizontal and vertical +directions. Also it may not support scaling at all. At the same time the +cropping/composing rectangles may have to be aligned, and both the source and +the sink may have arbitrary upper and lower size limits. Therefore, as usual, +drivers are expected to adjust the requested parameters and return the actual +values selected. An application can control the rounding behaviour using <link +linkend="v4l2-selection-flags"> constraint flags </link>.</para> + + <section> + + <title>Configuration of video capture</title> + +<para>See figure <xref linkend="sel-targets-capture" /> for examples of the +selection targets available for a video capture device. It is recommended to +configure the cropping targets before to the composing targets.</para> + +<para>The range of coordinates of the top left corner, width and height of +areas that can be sampled is given by the <constant> V4L2_SEL_TGT_CROP_BOUNDS +</constant> target. It is recommended for the driver developers to put the +top/left corner at position <constant> (0,0) </constant>. The rectangle's +coordinates are expressed in pixels.</para> + +<para>The top left corner, width and height of the source rectangle, that is +the area actually sampled, is given by the <constant> V4L2_SEL_TGT_CROP +</constant> target. It uses the same coordinate system as <constant> +V4L2_SEL_TGT_CROP_BOUNDS </constant>. The active cropping area must lie +completely inside the capture boundaries. The driver may further adjust the +requested size and/or position according to hardware limitations.</para> + +<para>Each capture device has a default source rectangle, given by the +<constant> V4L2_SEL_TGT_CROP_DEFAULT </constant> target. This rectangle shall +over what the driver writer considers the complete picture. Drivers shall set +the active crop rectangle to the default when the driver is first loaded, but +not later.</para> + +<para>The composing targets refer to a memory buffer. The limits of composing +coordinates are obtained using <constant> V4L2_SEL_TGT_COMPOSE_BOUNDS +</constant>. All coordinates are expressed in pixels. The rectangle's top/left +corner must be located at position <constant> (0,0) </constant>. The width and +height are equal to the image size set by <constant> VIDIOC_S_FMT </constant>. +</para> + +<para>The part of a buffer into which the image is inserted by the hardware is +controlled by the <constant> V4L2_SEL_TGT_COMPOSE </constant> target. +The rectangle's coordinates are also expressed in the same coordinate system as +the bounds rectangle. The composing rectangle must lie completely inside bounds +rectangle. The driver must adjust the composing rectangle to fit to the +bounding limits. Moreover, the driver can perform other adjustments according +to hardware limitations. The application can control rounding behaviour using +<link linkend="v4l2-selection-flags"> constraint flags </link>.</para> + +<para>For capture devices the default composing rectangle is queried using +<constant> V4L2_SEL_TGT_COMPOSE_DEFAULT </constant>. It is usually equal to the +bounding rectangle.</para> + +<para>The part of a buffer that is modified by the hardware is given by +<constant> V4L2_SEL_TGT_COMPOSE_PADDED </constant>. It contains all pixels +defined using <constant> V4L2_SEL_TGT_COMPOSE </constant> plus all +padding data modified by hardware during insertion process. All pixels outside +this rectangle <emphasis>must not</emphasis> be changed by the hardware. The +content of pixels that lie inside the padded area but outside active area is +undefined. The application can use the padded and active rectangles to detect +where the rubbish pixels are located and remove them if needed.</para> + + </section> + + <section> + + <title>Configuration of video output</title> + +<para>For output devices targets and ioctls are used similarly to the video +capture case. The <emphasis> composing </emphasis> rectangle refers to the +insertion of an image into a video signal. The cropping rectangles refer to a +memory buffer. It is recommended to configure the composing targets before to +the cropping targets.</para> + +<para>The cropping targets refer to the memory buffer that contains an image to +be inserted into a video signal or graphical screen. The limits of cropping +coordinates are obtained using <constant> V4L2_SEL_TGT_CROP_BOUNDS </constant>. +All coordinates are expressed in pixels. The top/left corner is always point +<constant> (0,0) </constant>. The width and height is equal to the image size +specified using <constant> VIDIOC_S_FMT </constant> ioctl.</para> + +<para>The top left corner, width and height of the source rectangle, that is +the area from which image date are processed by the hardware, is given by the +<constant> V4L2_SEL_TGT_CROP </constant>. Its coordinates are expressed +in in the same coordinate system as the bounds rectangle. The active cropping +area must lie completely inside the crop boundaries and the driver may further +adjust the requested size and/or position according to hardware +limitations.</para> + +<para>For output devices the default cropping rectangle is queried using +<constant> V4L2_SEL_TGT_CROP_DEFAULT </constant>. It is usually equal to the +bounding rectangle.</para> + +<para>The part of a video signal or graphics display where the image is +inserted by the hardware is controlled by <constant> +V4L2_SEL_TGT_COMPOSE </constant> target. The rectangle's coordinates +are expressed in pixels. The composing rectangle must lie completely inside the +bounds rectangle. The driver must adjust the area to fit to the bounding +limits. Moreover, the driver can perform other adjustments according to +hardware limitations. </para> + +<para>The device has a default composing rectangle, given by the <constant> +V4L2_SEL_TGT_COMPOSE_DEFAULT </constant> target. This rectangle shall cover what +the driver writer considers the complete picture. It is recommended for the +driver developers to put the top/left corner at position <constant> (0,0) +</constant>. Drivers shall set the active composing rectangle to the default +one when the driver is first loaded.</para> + +<para>The devices may introduce additional content to video signal other than +an image from memory buffers. It includes borders around an image. However, +such a padded area is driver-dependent feature not covered by this document. +Driver developers are encouraged to keep padded rectangle equal to active one. +The padded target is accessed by the <constant> V4L2_SEL_TGT_COMPOSE_PADDED +</constant> identifier. It must contain all pixels from the <constant> +V4L2_SEL_TGT_COMPOSE </constant> target.</para> + + </section> + + <section> + + <title>Scaling control</title> + +<para>An application can detect if scaling is performed by comparing the width +and the height of rectangles obtained using <constant> V4L2_SEL_TGT_CROP +</constant> and <constant> V4L2_SEL_TGT_COMPOSE </constant> targets. If +these are not equal then the scaling is applied. The application can compute +the scaling ratios using these values.</para> + + </section> + + </section> + + <section> + + <title>Comparison with old cropping API</title> + +<para>The selection API was introduced to cope with deficiencies of previous +<link linkend="crop"> API </link>, that was designed to control simple capture +devices. Later the cropping API was adopted by video output drivers. The ioctls +are used to select a part of the display were the video signal is inserted. It +should be considered as an API abuse because the described operation is +actually the composing. The selection API makes a clear distinction between +composing and cropping operations by setting the appropriate targets. The V4L2 +API lacks any support for composing to and cropping from an image inside a +memory buffer. The application could configure a capture device to fill only a +part of an image by abusing V4L2 API. Cropping a smaller image from a larger +one is achieved by setting the field +&v4l2-pix-format;<structfield>::bytesperline</structfield>. Introducing an image offsets +could be done by modifying field &v4l2-buffer;<structfield>::m_userptr</structfield> +before calling <constant> VIDIOC_QBUF </constant>. Those +operations should be avoided because they are not portable (endianness), and do +not work for macroblock and Bayer formats and mmap buffers. The selection API +deals with configuration of buffer cropping/composing in a clear, intuitive and +portable way. Next, with the selection API the concepts of the padded target +and constraints flags are introduced. Finally, &v4l2-crop; and &v4l2-cropcap; +have no reserved fields. Therefore there is no way to extend their functionality. +The new &v4l2-selection; provides a lot of place for future +extensions. Driver developers are encouraged to implement only selection API. +The former cropping API would be simulated using the new one. </para> + + </section> + + <section> + <title>Examples</title> + <example> + <title>Resetting the cropping parameters</title> + + <para>(A video capture device is assumed; change <constant> +V4L2_BUF_TYPE_VIDEO_CAPTURE </constant> for other devices; change target to +<constant> V4L2_SEL_TGT_COMPOSE_* </constant> family to configure composing +area)</para> + + <programlisting> + + &v4l2-selection; sel = { + .type = V4L2_BUF_TYPE_VIDEO_CAPTURE, + .target = V4L2_SEL_TGT_CROP_DEFAULT, + }; + ret = ioctl(fd, &VIDIOC-G-SELECTION;, &sel); + if (ret) + exit(-1); + sel.target = V4L2_SEL_TGT_CROP; + ret = ioctl(fd, &VIDIOC-S-SELECTION;, &sel); + if (ret) + exit(-1); + + </programlisting> + </example> + + <example> + <title>Simple downscaling</title> + <para>Setting a composing area on output of size of <emphasis> at most +</emphasis> half of limit placed at a center of a display.</para> + <programlisting> + + &v4l2-selection; sel = { + .type = V4L2_BUF_TYPE_VIDEO_OUTPUT, + .target = V4L2_SEL_TGT_COMPOSE_BOUNDS, + }; + struct v4l2_rect r; + + ret = ioctl(fd, &VIDIOC-G-SELECTION;, &sel); + if (ret) + exit(-1); + /* setting smaller compose rectangle */ + r.width = sel.r.width / 2; + r.height = sel.r.height / 2; + r.left = sel.r.width / 4; + r.top = sel.r.height / 4; + sel.r = r; + sel.target = V4L2_SEL_TGT_COMPOSE; + sel.flags = V4L2_SEL_FLAG_LE; + ret = ioctl(fd, &VIDIOC-S-SELECTION;, &sel); + if (ret) + exit(-1); + + </programlisting> + </example> + + <example> + <title>Querying for scaling factors</title> + <para>A video output device is assumed; change <constant> +V4L2_BUF_TYPE_VIDEO_OUTPUT </constant> for other devices</para> + <programlisting> + + &v4l2-selection; compose = { + .type = V4L2_BUF_TYPE_VIDEO_OUTPUT, + .target = V4L2_SEL_TGT_COMPOSE, + }; + &v4l2-selection; crop = { + .type = V4L2_BUF_TYPE_VIDEO_OUTPUT, + .target = V4L2_SEL_TGT_CROP, + }; + double hscale, vscale; + + ret = ioctl(fd, &VIDIOC-G-SELECTION;, &compose); + if (ret) + exit(-1); + ret = ioctl(fd, &VIDIOC-G-SELECTION;, &crop); + if (ret) + exit(-1); + + /* computing scaling factors */ + hscale = (double)compose.r.width / crop.r.width; + vscale = (double)compose.r.height / crop.r.height; + + </programlisting> + </example> + + </section> + +</section> diff --git a/Documentation/DocBook/media/v4l/selections-common.xml b/Documentation/DocBook/media/v4l/selections-common.xml new file mode 100644 index 00000000000..7502f784b8c --- /dev/null +++ b/Documentation/DocBook/media/v4l/selections-common.xml @@ -0,0 +1,164 @@ +<section id="v4l2-selections-common"> + + <title>Common selection definitions</title> + + <para>While the <link linkend="selection-api">V4L2 selection + API</link> and <link linkend="v4l2-subdev-selections">V4L2 subdev + selection APIs</link> are very similar, there's one fundamental + difference between the two. On sub-device API, the selection + rectangle refers to the media bus format, and is bound to a + sub-device's pad. On the V4L2 interface the selection rectangles + refer to the in-memory pixel format.</para> + + <para>This section defines the common definitions of the + selection interfaces on the two APIs.</para> + + <section id="v4l2-selection-targets"> + + <title>Selection targets</title> + + <para>The precise meaning of the selection targets may be + dependent on which of the two interfaces they are used.</para> + + <table pgwide="1" frame="none" id="v4l2-selection-targets-table"> + <title>Selection target definitions</title> + <tgroup cols="5"> + <colspec colname="c1" /> + <colspec colname="c2" /> + <colspec colname="c3" /> + <colspec colname="c4" /> + <colspec colname="c5" /> + &cs-def; + <thead> + <row rowsep="1"> + <entry align="left">Target name</entry> + <entry align="left">id</entry> + <entry align="left">Definition</entry> + <entry align="left">Valid for V4L2</entry> + <entry align="left">Valid for V4L2 subdev</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry><constant>V4L2_SEL_TGT_CROP</constant></entry> + <entry>0x0000</entry> + <entry>Crop rectangle. Defines the cropped area.</entry> + <entry>Yes</entry> + <entry>Yes</entry> + </row> + <row> + <entry><constant>V4L2_SEL_TGT_CROP_DEFAULT</constant></entry> + <entry>0x0001</entry> + <entry>Suggested cropping rectangle that covers the "whole picture".</entry> + <entry>Yes</entry> + <entry>No</entry> + </row> + <row> + <entry><constant>V4L2_SEL_TGT_CROP_BOUNDS</constant></entry> + <entry>0x0002</entry> + <entry>Bounds of the crop rectangle. All valid crop + rectangles fit inside the crop bounds rectangle. + </entry> + <entry>Yes</entry> + <entry>Yes</entry> + </row> + <row> + <entry><constant>V4L2_SEL_TGT_COMPOSE</constant></entry> + <entry>0x0100</entry> + <entry>Compose rectangle. Used to configure scaling + and composition.</entry> + <entry>Yes</entry> + <entry>Yes</entry> + </row> + <row> + <entry><constant>V4L2_SEL_TGT_COMPOSE_DEFAULT</constant></entry> + <entry>0x0101</entry> + <entry>Suggested composition rectangle that covers the "whole picture".</entry> + <entry>Yes</entry> + <entry>No</entry> + </row> + <row> + <entry><constant>V4L2_SEL_TGT_COMPOSE_BOUNDS</constant></entry> + <entry>0x0102</entry> + <entry>Bounds of the compose rectangle. All valid compose + rectangles fit inside the compose bounds rectangle.</entry> + <entry>Yes</entry> + <entry>Yes</entry> + </row> + <row> + <entry><constant>V4L2_SEL_TGT_COMPOSE_PADDED</constant></entry> + <entry>0x0103</entry> + <entry>The active area and all padding pixels that are inserted or + modified by hardware.</entry> + <entry>Yes</entry> + <entry>No</entry> + </row> + </tbody> + </tgroup> + </table> + + </section> + + <section id="v4l2-selection-flags"> + + <title>Selection flags</title> + + <table pgwide="1" frame="none" id="v4l2-selection-flags-table"> + <title>Selection flag definitions</title> + <tgroup cols="5"> + <colspec colname="c1" /> + <colspec colname="c2" /> + <colspec colname="c3" /> + <colspec colname="c4" /> + <colspec colname="c5" /> + &cs-def; + <thead> + <row rowsep="1"> + <entry align="left">Flag name</entry> + <entry align="left">id</entry> + <entry align="left">Definition</entry> + <entry align="left">Valid for V4L2</entry> + <entry align="left">Valid for V4L2 subdev</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry><constant>V4L2_SEL_FLAG_GE</constant></entry> + <entry>(1 << 0)</entry> + <entry>Suggest the driver it should choose greater or + equal rectangle (in size) than was requested. Albeit the + driver may choose a lesser size, it will only do so due to + hardware limitations. Without this flag (and + <constant>V4L2_SEL_FLAG_LE</constant>) the + behaviour is to choose the closest possible + rectangle.</entry> + <entry>Yes</entry> + <entry>Yes</entry> + </row> + <row> + <entry><constant>V4L2_SEL_FLAG_LE</constant></entry> + <entry>(1 << 1)</entry> + <entry>Suggest the driver it + should choose lesser or equal rectangle (in size) than was + requested. Albeit the driver may choose a greater size, it + will only do so due to hardware limitations.</entry> + <entry>Yes</entry> + <entry>Yes</entry> + </row> + <row> + <entry><constant>V4L2_SEL_FLAG_KEEP_CONFIG</constant></entry> + <entry>(1 << 2)</entry> + <entry>The configuration must not be propagated to any + further processing steps. If this flag is not given, the + configuration is propagated inside the subdevice to all + further processing steps.</entry> + <entry>No</entry> + <entry>Yes</entry> + </row> + </tbody> + </tgroup> + </table> + + </section> + +</section> diff --git a/Documentation/DocBook/media/v4l/subdev-formats.xml b/Documentation/DocBook/media/v4l/subdev-formats.xml new file mode 100644 index 00000000000..b2d5a0363cb --- /dev/null +++ b/Documentation/DocBook/media/v4l/subdev-formats.xml @@ -0,0 +1,3501 @@ +<section id="v4l2-mbus-format"> + <title>Media Bus Formats</title> + + <table pgwide="1" frame="none" id="v4l2-mbus-framefmt"> + <title>struct <structname>v4l2_mbus_framefmt</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>width</structfield></entry> + <entry>Image width, in pixels.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>height</structfield></entry> + <entry>Image height, in pixels.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>code</structfield></entry> + <entry>Format code, from &v4l2-mbus-pixelcode;.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>field</structfield></entry> + <entry>Field order, from &v4l2-field;. See + <xref linkend="field-order" /> for details.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>colorspace</structfield></entry> + <entry>Image colorspace, from &v4l2-colorspace;. See + <xref linkend="colorspaces" /> for details.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[7]</entry> + <entry>Reserved for future extensions. Applications and drivers must + set the array to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + + <section id="v4l2-mbus-pixelcode"> + <title>Media Bus Pixel Codes</title> + + <para>The media bus pixel codes describe image formats as flowing over + physical busses (both between separate physical components and inside SoC + devices). This should not be confused with the V4L2 pixel formats that + describe, using four character codes, image formats as stored in memory. + </para> + + <para>While there is a relationship between image formats on busses and + image formats in memory (a raw Bayer image won't be magically converted to + JPEG just by storing it to memory), there is no one-to-one correspondance + between them.</para> + + <section> + <title>Packed RGB Formats</title> + + <para>Those formats transfer pixel data as red, green and blue components. + The format code is made of the following information. + <itemizedlist> + <listitem><para>The red, green and blue components order code, as encoded in a + pixel sample. Possible values are RGB and BGR.</para></listitem> + <listitem><para>The number of bits per component, for each component. The values + can be different for all components. Common values are 555 and 565.</para> + </listitem> + <listitem><para>The number of bus samples per pixel. Pixels that are wider than + the bus width must be transferred in multiple samples. Common values are + 1 and 2.</para></listitem> + <listitem><para>The bus width.</para></listitem> + <listitem><para>For formats where the total number of bits per pixel is smaller + than the number of bus samples per pixel times the bus width, a padding + value stating if the bytes are padded in their most high order bits + (PADHI) or low order bits (PADLO).</para></listitem> + <listitem><para>For formats where the number of bus samples per pixel is larger + than 1, an endianness value stating if the pixel is transferred MSB first + (BE) or LSB first (LE).</para></listitem> + </itemizedlist> + </para> + + <para>For instance, a format where pixels are encoded as 5-bits red, 5-bits + green and 5-bit blue values padded on the high bit, transferred as 2 8-bit + samples per pixel with the most significant bits (padding, red and half of + the green value) transferred first will be named + <constant>V4L2_MBUS_FMT_RGB555_2X8_PADHI_BE</constant>. + </para> + + <para>The following tables list existing packed RGB formats.</para> + + <table pgwide="0" frame="none" id="v4l2-mbus-pixelcode-rgb"> + <title>RGB formats</title> + <tgroup cols="27"> + <colspec colname="id" align="left" /> + <colspec colname="code" align="center"/> + <colspec colname="bit" /> + <colspec colnum="4" colname="b31" align="center" /> + <colspec colnum="5" colname="b20" align="center" /> + <colspec colnum="6" colname="b29" align="center" /> + <colspec colnum="7" colname="b28" align="center" /> + <colspec colnum="8" colname="b27" align="center" /> + <colspec colnum="9" colname="b26" align="center" /> + <colspec colnum="10" colname="b25" align="center" /> + <colspec colnum="11" colname="b24" align="center" /> + <colspec colnum="12" colname="b23" align="center" /> + <colspec colnum="13" colname="b22" align="center" /> + <colspec colnum="14" colname="b21" align="center" /> + <colspec colnum="15" colname="b20" align="center" /> + <colspec colnum="16" colname="b19" align="center" /> + <colspec colnum="17" colname="b18" align="center" /> + <colspec colnum="18" colname="b17" align="center" /> + <colspec colnum="19" colname="b16" align="center" /> + <colspec colnum="20" colname="b15" align="center" /> + <colspec colnum="21" colname="b14" align="center" /> + <colspec colnum="22" colname="b13" align="center" /> + <colspec colnum="23" colname="b12" align="center" /> + <colspec colnum="24" colname="b11" align="center" /> + <colspec colnum="25" colname="b10" align="center" /> + <colspec colnum="26" colname="b09" align="center" /> + <colspec colnum="27" colname="b08" align="center" /> + <colspec colnum="28" colname="b07" align="center" /> + <colspec colnum="29" colname="b06" align="center" /> + <colspec colnum="30" colname="b05" align="center" /> + <colspec colnum="31" colname="b04" align="center" /> + <colspec colnum="32" colname="b03" align="center" /> + <colspec colnum="33" colname="b02" align="center" /> + <colspec colnum="34" colname="b01" align="center" /> + <colspec colnum="35" colname="b00" align="center" /> + <spanspec namest="b31" nameend="b00" spanname="b0" /> + <thead> + <row> + <entry>Identifier</entry> + <entry>Code</entry> + <entry></entry> + <entry spanname="b0">Data organization</entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry>Bit</entry> + <entry>31</entry> + <entry>30</entry> + <entry>29</entry> + <entry>28</entry> + <entry>27</entry> + <entry>26</entry> + <entry>25</entry> + <entry>24</entry> + <entry>23</entry> + <entry>22</entry> + <entry>21</entry> + <entry>20</entry> + <entry>19</entry> + <entry>18</entry> + <entry>17</entry> + <entry>16</entry> + <entry>15</entry> + <entry>14</entry> + <entry>13</entry> + <entry>12</entry> + <entry>11</entry> + <entry>10</entry> + <entry>9</entry> + <entry>8</entry> + <entry>7</entry> + <entry>6</entry> + <entry>5</entry> + <entry>4</entry> + <entry>3</entry> + <entry>2</entry> + <entry>1</entry> + <entry>0</entry> + </row> + </thead> + <tbody valign="top"> + <row id="V4L2-MBUS-FMT-RGB444-2X8-PADHI-BE"> + <entry>V4L2_MBUS_FMT_RGB444_2X8_PADHI_BE</entry> + <entry>0x1001</entry> + <entry></entry> + &dash-ent-24; + <entry>0</entry> + <entry>0</entry> + <entry>0</entry> + <entry>0</entry> + <entry>r<subscript>3</subscript></entry> + <entry>r<subscript>2</subscript></entry> + <entry>r<subscript>1</subscript></entry> + <entry>r<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>g<subscript>3</subscript></entry> + <entry>g<subscript>2</subscript></entry> + <entry>g<subscript>1</subscript></entry> + <entry>g<subscript>0</subscript></entry> + <entry>b<subscript>3</subscript></entry> + <entry>b<subscript>2</subscript></entry> + <entry>b<subscript>1</subscript></entry> + <entry>b<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-RGB444-2X8-PADHI-LE"> + <entry>V4L2_MBUS_FMT_RGB444_2X8_PADHI_LE</entry> + <entry>0x1002</entry> + <entry></entry> + &dash-ent-24; + <entry>g<subscript>3</subscript></entry> + <entry>g<subscript>2</subscript></entry> + <entry>g<subscript>1</subscript></entry> + <entry>g<subscript>0</subscript></entry> + <entry>b<subscript>3</subscript></entry> + <entry>b<subscript>2</subscript></entry> + <entry>b<subscript>1</subscript></entry> + <entry>b<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>0</entry> + <entry>0</entry> + <entry>0</entry> + <entry>0</entry> + <entry>r<subscript>3</subscript></entry> + <entry>r<subscript>2</subscript></entry> + <entry>r<subscript>1</subscript></entry> + <entry>r<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-RGB555-2X8-PADHI-BE"> + <entry>V4L2_MBUS_FMT_RGB555_2X8_PADHI_BE</entry> + <entry>0x1003</entry> + <entry></entry> + &dash-ent-24; + <entry>0</entry> + <entry>r<subscript>4</subscript></entry> + <entry>r<subscript>3</subscript></entry> + <entry>r<subscript>2</subscript></entry> + <entry>r<subscript>1</subscript></entry> + <entry>r<subscript>0</subscript></entry> + <entry>g<subscript>4</subscript></entry> + <entry>g<subscript>3</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>g<subscript>2</subscript></entry> + <entry>g<subscript>1</subscript></entry> + <entry>g<subscript>0</subscript></entry> + <entry>b<subscript>4</subscript></entry> + <entry>b<subscript>3</subscript></entry> + <entry>b<subscript>2</subscript></entry> + <entry>b<subscript>1</subscript></entry> + <entry>b<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-RGB555-2X8-PADHI-LE"> + <entry>V4L2_MBUS_FMT_RGB555_2X8_PADHI_LE</entry> + <entry>0x1004</entry> + <entry></entry> + &dash-ent-24; + <entry>g<subscript>2</subscript></entry> + <entry>g<subscript>1</subscript></entry> + <entry>g<subscript>0</subscript></entry> + <entry>b<subscript>4</subscript></entry> + <entry>b<subscript>3</subscript></entry> + <entry>b<subscript>2</subscript></entry> + <entry>b<subscript>1</subscript></entry> + <entry>b<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>0</entry> + <entry>r<subscript>4</subscript></entry> + <entry>r<subscript>3</subscript></entry> + <entry>r<subscript>2</subscript></entry> + <entry>r<subscript>1</subscript></entry> + <entry>r<subscript>0</subscript></entry> + <entry>g<subscript>4</subscript></entry> + <entry>g<subscript>3</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-BGR565-2X8-BE"> + <entry>V4L2_MBUS_FMT_BGR565_2X8_BE</entry> + <entry>0x1005</entry> + <entry></entry> + &dash-ent-24; + <entry>b<subscript>4</subscript></entry> + <entry>b<subscript>3</subscript></entry> + <entry>b<subscript>2</subscript></entry> + <entry>b<subscript>1</subscript></entry> + <entry>b<subscript>0</subscript></entry> + <entry>g<subscript>5</subscript></entry> + <entry>g<subscript>4</subscript></entry> + <entry>g<subscript>3</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>g<subscript>2</subscript></entry> + <entry>g<subscript>1</subscript></entry> + <entry>g<subscript>0</subscript></entry> + <entry>r<subscript>4</subscript></entry> + <entry>r<subscript>3</subscript></entry> + <entry>r<subscript>2</subscript></entry> + <entry>r<subscript>1</subscript></entry> + <entry>r<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-BGR565-2X8-LE"> + <entry>V4L2_MBUS_FMT_BGR565_2X8_LE</entry> + <entry>0x1006</entry> + <entry></entry> + &dash-ent-24; + <entry>g<subscript>2</subscript></entry> + <entry>g<subscript>1</subscript></entry> + <entry>g<subscript>0</subscript></entry> + <entry>r<subscript>4</subscript></entry> + <entry>r<subscript>3</subscript></entry> + <entry>r<subscript>2</subscript></entry> + <entry>r<subscript>1</subscript></entry> + <entry>r<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>b<subscript>4</subscript></entry> + <entry>b<subscript>3</subscript></entry> + <entry>b<subscript>2</subscript></entry> + <entry>b<subscript>1</subscript></entry> + <entry>b<subscript>0</subscript></entry> + <entry>g<subscript>5</subscript></entry> + <entry>g<subscript>4</subscript></entry> + <entry>g<subscript>3</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-RGB565-2X8-BE"> + <entry>V4L2_MBUS_FMT_RGB565_2X8_BE</entry> + <entry>0x1007</entry> + <entry></entry> + &dash-ent-24; + <entry>r<subscript>4</subscript></entry> + <entry>r<subscript>3</subscript></entry> + <entry>r<subscript>2</subscript></entry> + <entry>r<subscript>1</subscript></entry> + <entry>r<subscript>0</subscript></entry> + <entry>g<subscript>5</subscript></entry> + <entry>g<subscript>4</subscript></entry> + <entry>g<subscript>3</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>g<subscript>2</subscript></entry> + <entry>g<subscript>1</subscript></entry> + <entry>g<subscript>0</subscript></entry> + <entry>b<subscript>4</subscript></entry> + <entry>b<subscript>3</subscript></entry> + <entry>b<subscript>2</subscript></entry> + <entry>b<subscript>1</subscript></entry> + <entry>b<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-RGB565-2X8-LE"> + <entry>V4L2_MBUS_FMT_RGB565_2X8_LE</entry> + <entry>0x1008</entry> + <entry></entry> + &dash-ent-24; + <entry>g<subscript>2</subscript></entry> + <entry>g<subscript>1</subscript></entry> + <entry>g<subscript>0</subscript></entry> + <entry>b<subscript>4</subscript></entry> + <entry>b<subscript>3</subscript></entry> + <entry>b<subscript>2</subscript></entry> + <entry>b<subscript>1</subscript></entry> + <entry>b<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>r<subscript>4</subscript></entry> + <entry>r<subscript>3</subscript></entry> + <entry>r<subscript>2</subscript></entry> + <entry>r<subscript>1</subscript></entry> + <entry>r<subscript>0</subscript></entry> + <entry>g<subscript>5</subscript></entry> + <entry>g<subscript>4</subscript></entry> + <entry>g<subscript>3</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-RGB666-1X18"> + <entry>V4L2_MBUS_FMT_RGB666_1X18</entry> + <entry>0x1009</entry> + <entry></entry> + &dash-ent-14; + <entry>r<subscript>5</subscript></entry> + <entry>r<subscript>4</subscript></entry> + <entry>r<subscript>3</subscript></entry> + <entry>r<subscript>2</subscript></entry> + <entry>r<subscript>1</subscript></entry> + <entry>r<subscript>0</subscript></entry> + <entry>g<subscript>5</subscript></entry> + <entry>g<subscript>4</subscript></entry> + <entry>g<subscript>3</subscript></entry> + <entry>g<subscript>2</subscript></entry> + <entry>g<subscript>1</subscript></entry> + <entry>g<subscript>0</subscript></entry> + <entry>b<subscript>5</subscript></entry> + <entry>b<subscript>4</subscript></entry> + <entry>b<subscript>3</subscript></entry> + <entry>b<subscript>2</subscript></entry> + <entry>b<subscript>1</subscript></entry> + <entry>b<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-RGB888-1X24"> + <entry>V4L2_MBUS_FMT_RGB888_1X24</entry> + <entry>0x100a</entry> + <entry></entry> + &dash-ent-8; + <entry>r<subscript>7</subscript></entry> + <entry>r<subscript>6</subscript></entry> + <entry>r<subscript>5</subscript></entry> + <entry>r<subscript>4</subscript></entry> + <entry>r<subscript>3</subscript></entry> + <entry>r<subscript>2</subscript></entry> + <entry>r<subscript>1</subscript></entry> + <entry>r<subscript>0</subscript></entry> + <entry>g<subscript>7</subscript></entry> + <entry>g<subscript>6</subscript></entry> + <entry>g<subscript>5</subscript></entry> + <entry>g<subscript>4</subscript></entry> + <entry>g<subscript>3</subscript></entry> + <entry>g<subscript>2</subscript></entry> + <entry>g<subscript>1</subscript></entry> + <entry>g<subscript>0</subscript></entry> + <entry>b<subscript>7</subscript></entry> + <entry>b<subscript>6</subscript></entry> + <entry>b<subscript>5</subscript></entry> + <entry>b<subscript>4</subscript></entry> + <entry>b<subscript>3</subscript></entry> + <entry>b<subscript>2</subscript></entry> + <entry>b<subscript>1</subscript></entry> + <entry>b<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-RGB888-2X12-BE"> + <entry>V4L2_MBUS_FMT_RGB888_2X12_BE</entry> + <entry>0x100b</entry> + <entry></entry> + &dash-ent-20; + <entry>r<subscript>7</subscript></entry> + <entry>r<subscript>6</subscript></entry> + <entry>r<subscript>5</subscript></entry> + <entry>r<subscript>4</subscript></entry> + <entry>r<subscript>3</subscript></entry> + <entry>r<subscript>2</subscript></entry> + <entry>r<subscript>1</subscript></entry> + <entry>r<subscript>0</subscript></entry> + <entry>g<subscript>7</subscript></entry> + <entry>g<subscript>6</subscript></entry> + <entry>g<subscript>5</subscript></entry> + <entry>g<subscript>4</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-20; + <entry>g<subscript>3</subscript></entry> + <entry>g<subscript>2</subscript></entry> + <entry>g<subscript>1</subscript></entry> + <entry>g<subscript>0</subscript></entry> + <entry>b<subscript>7</subscript></entry> + <entry>b<subscript>6</subscript></entry> + <entry>b<subscript>5</subscript></entry> + <entry>b<subscript>4</subscript></entry> + <entry>b<subscript>3</subscript></entry> + <entry>b<subscript>2</subscript></entry> + <entry>b<subscript>1</subscript></entry> + <entry>b<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-RGB888-2X12-LE"> + <entry>V4L2_MBUS_FMT_RGB888_2X12_LE</entry> + <entry>0x100c</entry> + <entry></entry> + &dash-ent-20; + <entry>g<subscript>3</subscript></entry> + <entry>g<subscript>2</subscript></entry> + <entry>g<subscript>1</subscript></entry> + <entry>g<subscript>0</subscript></entry> + <entry>b<subscript>7</subscript></entry> + <entry>b<subscript>6</subscript></entry> + <entry>b<subscript>5</subscript></entry> + <entry>b<subscript>4</subscript></entry> + <entry>b<subscript>3</subscript></entry> + <entry>b<subscript>2</subscript></entry> + <entry>b<subscript>1</subscript></entry> + <entry>b<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-20; + <entry>r<subscript>7</subscript></entry> + <entry>r<subscript>6</subscript></entry> + <entry>r<subscript>5</subscript></entry> + <entry>r<subscript>4</subscript></entry> + <entry>r<subscript>3</subscript></entry> + <entry>r<subscript>2</subscript></entry> + <entry>r<subscript>1</subscript></entry> + <entry>r<subscript>0</subscript></entry> + <entry>g<subscript>7</subscript></entry> + <entry>g<subscript>6</subscript></entry> + <entry>g<subscript>5</subscript></entry> + <entry>g<subscript>4</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-ARGB888-1X32"> + <entry>V4L2_MBUS_FMT_ARGB888_1X32</entry> + <entry>0x100d</entry> + <entry></entry> + <entry>a<subscript>7</subscript></entry> + <entry>a<subscript>6</subscript></entry> + <entry>a<subscript>5</subscript></entry> + <entry>a<subscript>4</subscript></entry> + <entry>a<subscript>3</subscript></entry> + <entry>a<subscript>2</subscript></entry> + <entry>a<subscript>1</subscript></entry> + <entry>a<subscript>0</subscript></entry> + <entry>r<subscript>7</subscript></entry> + <entry>r<subscript>6</subscript></entry> + <entry>r<subscript>5</subscript></entry> + <entry>r<subscript>4</subscript></entry> + <entry>r<subscript>3</subscript></entry> + <entry>r<subscript>2</subscript></entry> + <entry>r<subscript>1</subscript></entry> + <entry>r<subscript>0</subscript></entry> + <entry>g<subscript>7</subscript></entry> + <entry>g<subscript>6</subscript></entry> + <entry>g<subscript>5</subscript></entry> + <entry>g<subscript>4</subscript></entry> + <entry>g<subscript>3</subscript></entry> + <entry>g<subscript>2</subscript></entry> + <entry>g<subscript>1</subscript></entry> + <entry>g<subscript>0</subscript></entry> + <entry>b<subscript>7</subscript></entry> + <entry>b<subscript>6</subscript></entry> + <entry>b<subscript>5</subscript></entry> + <entry>b<subscript>4</subscript></entry> + <entry>b<subscript>3</subscript></entry> + <entry>b<subscript>2</subscript></entry> + <entry>b<subscript>1</subscript></entry> + <entry>b<subscript>0</subscript></entry> + </row> + </tbody> + </tgroup> + </table> + </section> + + <section> + <title>Bayer Formats</title> + + <para>Those formats transfer pixel data as red, green and blue components. + The format code is made of the following information. + <itemizedlist> + <listitem><para>The red, green and blue components order code, as encoded in a + pixel sample. The possible values are shown in <xref + linkend="bayer-patterns" />.</para></listitem> + <listitem><para>The number of bits per pixel component. All components are + transferred on the same number of bits. Common values are 8, 10 and 12.</para> + </listitem> + <listitem><para>The compression (optional). If the pixel components are + ALAW- or DPCM-compressed, a mention of the compression scheme and the + number of bits per compressed pixel component.</para></listitem> + <listitem><para>The number of bus samples per pixel. Pixels that are wider than + the bus width must be transferred in multiple samples. Common values are + 1 and 2.</para></listitem> + <listitem><para>The bus width.</para></listitem> + <listitem><para>For formats where the total number of bits per pixel is smaller + than the number of bus samples per pixel times the bus width, a padding + value stating if the bytes are padded in their most high order bits + (PADHI) or low order bits (PADLO).</para></listitem> + <listitem><para>For formats where the number of bus samples per pixel is larger + than 1, an endianness value stating if the pixel is transferred MSB first + (BE) or LSB first (LE).</para></listitem> + </itemizedlist> + </para> + + <para>For instance, a format with uncompressed 10-bit Bayer components + arranged in a red, green, green, blue pattern transferred as 2 8-bit + samples per pixel with the least significant bits transferred first will + be named <constant>V4L2_MBUS_FMT_SRGGB10_2X8_PADHI_LE</constant>. + </para> + + <figure id="bayer-patterns"> + <title>Bayer Patterns</title> + <mediaobject> + <imageobject> + <imagedata fileref="bayer.png" format="PNG" /> + </imageobject> + <textobject> + <phrase>Bayer filter color patterns</phrase> + </textobject> + </mediaobject> + </figure> + + <para>The following table lists existing packed Bayer formats. The data + organization is given as an example for the first pixel only.</para> + + <table pgwide="0" frame="none" id="v4l2-mbus-pixelcode-bayer"> + <title>Bayer Formats</title> + <tgroup cols="15"> + <colspec colname="id" align="left" /> + <colspec colname="code" align="center"/> + <colspec colname="bit" /> + <colspec colnum="4" colname="b11" align="center" /> + <colspec colnum="5" colname="b10" align="center" /> + <colspec colnum="6" colname="b09" align="center" /> + <colspec colnum="7" colname="b08" align="center" /> + <colspec colnum="8" colname="b07" align="center" /> + <colspec colnum="9" colname="b06" align="center" /> + <colspec colnum="10" colname="b05" align="center" /> + <colspec colnum="11" colname="b04" align="center" /> + <colspec colnum="12" colname="b03" align="center" /> + <colspec colnum="13" colname="b02" align="center" /> + <colspec colnum="14" colname="b01" align="center" /> + <colspec colnum="15" colname="b00" align="center" /> + <spanspec namest="b11" nameend="b00" spanname="b0" /> + <thead> + <row> + <entry>Identifier</entry> + <entry>Code</entry> + <entry></entry> + <entry spanname="b0">Data organization</entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry>Bit</entry> + <entry>11</entry> + <entry>10</entry> + <entry>9</entry> + <entry>8</entry> + <entry>7</entry> + <entry>6</entry> + <entry>5</entry> + <entry>4</entry> + <entry>3</entry> + <entry>2</entry> + <entry>1</entry> + <entry>0</entry> + </row> + </thead> + <tbody valign="top"> + <row id="V4L2-MBUS-FMT-SBGGR8-1X8"> + <entry>V4L2_MBUS_FMT_SBGGR8_1X8</entry> + <entry>0x3001</entry> + <entry></entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>b<subscript>7</subscript></entry> + <entry>b<subscript>6</subscript></entry> + <entry>b<subscript>5</subscript></entry> + <entry>b<subscript>4</subscript></entry> + <entry>b<subscript>3</subscript></entry> + <entry>b<subscript>2</subscript></entry> + <entry>b<subscript>1</subscript></entry> + <entry>b<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-SGBRG8-1X8"> + <entry>V4L2_MBUS_FMT_SGBRG8_1X8</entry> + <entry>0x3013</entry> + <entry></entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>g<subscript>7</subscript></entry> + <entry>g<subscript>6</subscript></entry> + <entry>g<subscript>5</subscript></entry> + <entry>g<subscript>4</subscript></entry> + <entry>g<subscript>3</subscript></entry> + <entry>g<subscript>2</subscript></entry> + <entry>g<subscript>1</subscript></entry> + <entry>g<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-SGRBG8-1X8"> + <entry>V4L2_MBUS_FMT_SGRBG8_1X8</entry> + <entry>0x3002</entry> + <entry></entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>g<subscript>7</subscript></entry> + <entry>g<subscript>6</subscript></entry> + <entry>g<subscript>5</subscript></entry> + <entry>g<subscript>4</subscript></entry> + <entry>g<subscript>3</subscript></entry> + <entry>g<subscript>2</subscript></entry> + <entry>g<subscript>1</subscript></entry> + <entry>g<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-SRGGB8-1X8"> + <entry>V4L2_MBUS_FMT_SRGGB8_1X8</entry> + <entry>0x3014</entry> + <entry></entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>r<subscript>7</subscript></entry> + <entry>r<subscript>6</subscript></entry> + <entry>r<subscript>5</subscript></entry> + <entry>r<subscript>4</subscript></entry> + <entry>r<subscript>3</subscript></entry> + <entry>r<subscript>2</subscript></entry> + <entry>r<subscript>1</subscript></entry> + <entry>r<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-SBGGR10-ALAW8-1X8"> + <entry>V4L2_MBUS_FMT_SBGGR10_ALAW8_1X8</entry> + <entry>0x3015</entry> + <entry></entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>b<subscript>7</subscript></entry> + <entry>b<subscript>6</subscript></entry> + <entry>b<subscript>5</subscript></entry> + <entry>b<subscript>4</subscript></entry> + <entry>b<subscript>3</subscript></entry> + <entry>b<subscript>2</subscript></entry> + <entry>b<subscript>1</subscript></entry> + <entry>b<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-SGBRG10-ALAW8-1X8"> + <entry>V4L2_MBUS_FMT_SGBRG10_ALAW8_1X8</entry> + <entry>0x3016</entry> + <entry></entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>g<subscript>7</subscript></entry> + <entry>g<subscript>6</subscript></entry> + <entry>g<subscript>5</subscript></entry> + <entry>g<subscript>4</subscript></entry> + <entry>g<subscript>3</subscript></entry> + <entry>g<subscript>2</subscript></entry> + <entry>g<subscript>1</subscript></entry> + <entry>g<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-SGRBG10-ALAW8-1X8"> + <entry>V4L2_MBUS_FMT_SGRBG10_ALAW8_1X8</entry> + <entry>0x3017</entry> + <entry></entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>g<subscript>7</subscript></entry> + <entry>g<subscript>6</subscript></entry> + <entry>g<subscript>5</subscript></entry> + <entry>g<subscript>4</subscript></entry> + <entry>g<subscript>3</subscript></entry> + <entry>g<subscript>2</subscript></entry> + <entry>g<subscript>1</subscript></entry> + <entry>g<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-SRGGB10-ALAW8-1X8"> + <entry>V4L2_MBUS_FMT_SRGGB10_ALAW8_1X8</entry> + <entry>0x3018</entry> + <entry></entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>r<subscript>7</subscript></entry> + <entry>r<subscript>6</subscript></entry> + <entry>r<subscript>5</subscript></entry> + <entry>r<subscript>4</subscript></entry> + <entry>r<subscript>3</subscript></entry> + <entry>r<subscript>2</subscript></entry> + <entry>r<subscript>1</subscript></entry> + <entry>r<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-SBGGR10-DPCM8-1X8"> + <entry>V4L2_MBUS_FMT_SBGGR10_DPCM8_1X8</entry> + <entry>0x300b</entry> + <entry></entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>b<subscript>7</subscript></entry> + <entry>b<subscript>6</subscript></entry> + <entry>b<subscript>5</subscript></entry> + <entry>b<subscript>4</subscript></entry> + <entry>b<subscript>3</subscript></entry> + <entry>b<subscript>2</subscript></entry> + <entry>b<subscript>1</subscript></entry> + <entry>b<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-SGBRG10-DPCM8-1X8"> + <entry>V4L2_MBUS_FMT_SGBRG10_DPCM8_1X8</entry> + <entry>0x300c</entry> + <entry></entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>g<subscript>7</subscript></entry> + <entry>g<subscript>6</subscript></entry> + <entry>g<subscript>5</subscript></entry> + <entry>g<subscript>4</subscript></entry> + <entry>g<subscript>3</subscript></entry> + <entry>g<subscript>2</subscript></entry> + <entry>g<subscript>1</subscript></entry> + <entry>g<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-SGRBG10-DPCM8-1X8"> + <entry>V4L2_MBUS_FMT_SGRBG10_DPCM8_1X8</entry> + <entry>0x3009</entry> + <entry></entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>g<subscript>7</subscript></entry> + <entry>g<subscript>6</subscript></entry> + <entry>g<subscript>5</subscript></entry> + <entry>g<subscript>4</subscript></entry> + <entry>g<subscript>3</subscript></entry> + <entry>g<subscript>2</subscript></entry> + <entry>g<subscript>1</subscript></entry> + <entry>g<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-SRGGB10-DPCM8-1X8"> + <entry>V4L2_MBUS_FMT_SRGGB10_DPCM8_1X8</entry> + <entry>0x300d</entry> + <entry></entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>r<subscript>7</subscript></entry> + <entry>r<subscript>6</subscript></entry> + <entry>r<subscript>5</subscript></entry> + <entry>r<subscript>4</subscript></entry> + <entry>r<subscript>3</subscript></entry> + <entry>r<subscript>2</subscript></entry> + <entry>r<subscript>1</subscript></entry> + <entry>r<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-SBGGR10-2X8-PADHI-BE"> + <entry>V4L2_MBUS_FMT_SBGGR10_2X8_PADHI_BE</entry> + <entry>0x3003</entry> + <entry></entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>0</entry> + <entry>0</entry> + <entry>0</entry> + <entry>0</entry> + <entry>0</entry> + <entry>0</entry> + <entry>b<subscript>9</subscript></entry> + <entry>b<subscript>8</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>b<subscript>7</subscript></entry> + <entry>b<subscript>6</subscript></entry> + <entry>b<subscript>5</subscript></entry> + <entry>b<subscript>4</subscript></entry> + <entry>b<subscript>3</subscript></entry> + <entry>b<subscript>2</subscript></entry> + <entry>b<subscript>1</subscript></entry> + <entry>b<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-SBGGR10-2X8-PADHI-LE"> + <entry>V4L2_MBUS_FMT_SBGGR10_2X8_PADHI_LE</entry> + <entry>0x3004</entry> + <entry></entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>b<subscript>7</subscript></entry> + <entry>b<subscript>6</subscript></entry> + <entry>b<subscript>5</subscript></entry> + <entry>b<subscript>4</subscript></entry> + <entry>b<subscript>3</subscript></entry> + <entry>b<subscript>2</subscript></entry> + <entry>b<subscript>1</subscript></entry> + <entry>b<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>0</entry> + <entry>0</entry> + <entry>0</entry> + <entry>0</entry> + <entry>0</entry> + <entry>0</entry> + <entry>b<subscript>9</subscript></entry> + <entry>b<subscript>8</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-SBGGR10-2X8-PADLO-BE"> + <entry>V4L2_MBUS_FMT_SBGGR10_2X8_PADLO_BE</entry> + <entry>0x3005</entry> + <entry></entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>b<subscript>9</subscript></entry> + <entry>b<subscript>8</subscript></entry> + <entry>b<subscript>7</subscript></entry> + <entry>b<subscript>6</subscript></entry> + <entry>b<subscript>5</subscript></entry> + <entry>b<subscript>4</subscript></entry> + <entry>b<subscript>3</subscript></entry> + <entry>b<subscript>2</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>b<subscript>1</subscript></entry> + <entry>b<subscript>0</subscript></entry> + <entry>0</entry> + <entry>0</entry> + <entry>0</entry> + <entry>0</entry> + <entry>0</entry> + <entry>0</entry> + </row> + <row id="V4L2-MBUS-FMT-SBGGR10-2X8-PADLO-LE"> + <entry>V4L2_MBUS_FMT_SBGGR10_2X8_PADLO_LE</entry> + <entry>0x3006</entry> + <entry></entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>b<subscript>1</subscript></entry> + <entry>b<subscript>0</subscript></entry> + <entry>0</entry> + <entry>0</entry> + <entry>0</entry> + <entry>0</entry> + <entry>0</entry> + <entry>0</entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>-</entry> + <entry>b<subscript>9</subscript></entry> + <entry>b<subscript>8</subscript></entry> + <entry>b<subscript>7</subscript></entry> + <entry>b<subscript>6</subscript></entry> + <entry>b<subscript>5</subscript></entry> + <entry>b<subscript>4</subscript></entry> + <entry>b<subscript>3</subscript></entry> + <entry>b<subscript>2</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-SBGGR10-1X10"> + <entry>V4L2_MBUS_FMT_SBGGR10_1X10</entry> + <entry>0x3007</entry> + <entry></entry> + <entry>-</entry> + <entry>-</entry> + <entry>b<subscript>9</subscript></entry> + <entry>b<subscript>8</subscript></entry> + <entry>b<subscript>7</subscript></entry> + <entry>b<subscript>6</subscript></entry> + <entry>b<subscript>5</subscript></entry> + <entry>b<subscript>4</subscript></entry> + <entry>b<subscript>3</subscript></entry> + <entry>b<subscript>2</subscript></entry> + <entry>b<subscript>1</subscript></entry> + <entry>b<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-SGBRG10-1X10"> + <entry>V4L2_MBUS_FMT_SGBRG10_1X10</entry> + <entry>0x300e</entry> + <entry></entry> + <entry>-</entry> + <entry>-</entry> + <entry>g<subscript>9</subscript></entry> + <entry>g<subscript>8</subscript></entry> + <entry>g<subscript>7</subscript></entry> + <entry>g<subscript>6</subscript></entry> + <entry>g<subscript>5</subscript></entry> + <entry>g<subscript>4</subscript></entry> + <entry>g<subscript>3</subscript></entry> + <entry>g<subscript>2</subscript></entry> + <entry>g<subscript>1</subscript></entry> + <entry>g<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-SGRBG10-1X10"> + <entry>V4L2_MBUS_FMT_SGRBG10_1X10</entry> + <entry>0x300a</entry> + <entry></entry> + <entry>-</entry> + <entry>-</entry> + <entry>g<subscript>9</subscript></entry> + <entry>g<subscript>8</subscript></entry> + <entry>g<subscript>7</subscript></entry> + <entry>g<subscript>6</subscript></entry> + <entry>g<subscript>5</subscript></entry> + <entry>g<subscript>4</subscript></entry> + <entry>g<subscript>3</subscript></entry> + <entry>g<subscript>2</subscript></entry> + <entry>g<subscript>1</subscript></entry> + <entry>g<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-SRGGB10-1X10"> + <entry>V4L2_MBUS_FMT_SRGGB10_1X10</entry> + <entry>0x300f</entry> + <entry></entry> + <entry>-</entry> + <entry>-</entry> + <entry>r<subscript>9</subscript></entry> + <entry>r<subscript>8</subscript></entry> + <entry>r<subscript>7</subscript></entry> + <entry>r<subscript>6</subscript></entry> + <entry>r<subscript>5</subscript></entry> + <entry>r<subscript>4</subscript></entry> + <entry>r<subscript>3</subscript></entry> + <entry>r<subscript>2</subscript></entry> + <entry>r<subscript>1</subscript></entry> + <entry>r<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-SBGGR12-1X12"> + <entry>V4L2_MBUS_FMT_SBGGR12_1X12</entry> + <entry>0x3008</entry> + <entry></entry> + <entry>b<subscript>11</subscript></entry> + <entry>b<subscript>10</subscript></entry> + <entry>b<subscript>9</subscript></entry> + <entry>b<subscript>8</subscript></entry> + <entry>b<subscript>7</subscript></entry> + <entry>b<subscript>6</subscript></entry> + <entry>b<subscript>5</subscript></entry> + <entry>b<subscript>4</subscript></entry> + <entry>b<subscript>3</subscript></entry> + <entry>b<subscript>2</subscript></entry> + <entry>b<subscript>1</subscript></entry> + <entry>b<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-SGBRG12-1X12"> + <entry>V4L2_MBUS_FMT_SGBRG12_1X12</entry> + <entry>0x3010</entry> + <entry></entry> + <entry>g<subscript>11</subscript></entry> + <entry>g<subscript>10</subscript></entry> + <entry>g<subscript>9</subscript></entry> + <entry>g<subscript>8</subscript></entry> + <entry>g<subscript>7</subscript></entry> + <entry>g<subscript>6</subscript></entry> + <entry>g<subscript>5</subscript></entry> + <entry>g<subscript>4</subscript></entry> + <entry>g<subscript>3</subscript></entry> + <entry>g<subscript>2</subscript></entry> + <entry>g<subscript>1</subscript></entry> + <entry>g<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-SGRBG12-1X12"> + <entry>V4L2_MBUS_FMT_SGRBG12_1X12</entry> + <entry>0x3011</entry> + <entry></entry> + <entry>g<subscript>11</subscript></entry> + <entry>g<subscript>10</subscript></entry> + <entry>g<subscript>9</subscript></entry> + <entry>g<subscript>8</subscript></entry> + <entry>g<subscript>7</subscript></entry> + <entry>g<subscript>6</subscript></entry> + <entry>g<subscript>5</subscript></entry> + <entry>g<subscript>4</subscript></entry> + <entry>g<subscript>3</subscript></entry> + <entry>g<subscript>2</subscript></entry> + <entry>g<subscript>1</subscript></entry> + <entry>g<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-SRGGB12-1X12"> + <entry>V4L2_MBUS_FMT_SRGGB12_1X12</entry> + <entry>0x3012</entry> + <entry></entry> + <entry>r<subscript>11</subscript></entry> + <entry>r<subscript>10</subscript></entry> + <entry>r<subscript>9</subscript></entry> + <entry>r<subscript>8</subscript></entry> + <entry>r<subscript>7</subscript></entry> + <entry>r<subscript>6</subscript></entry> + <entry>r<subscript>5</subscript></entry> + <entry>r<subscript>4</subscript></entry> + <entry>r<subscript>3</subscript></entry> + <entry>r<subscript>2</subscript></entry> + <entry>r<subscript>1</subscript></entry> + <entry>r<subscript>0</subscript></entry> + </row> + </tbody> + </tgroup> + </table> + </section> + + <section> + <title>Packed YUV Formats</title> + + <para>Those data formats transfer pixel data as (possibly downsampled) Y, U + and V components. Some formats include dummy bits in some of their samples + and are collectively referred to as "YDYC" (Y-Dummy-Y-Chroma) formats. + One cannot rely on the values of these dummy bits as those are undefined. + </para> + <para>The format code is made of the following information. + <itemizedlist> + <listitem><para>The Y, U and V components order code, as transferred on the + bus. Possible values are YUYV, UYVY, YVYU and VYUY for formats with no + dummy bit, and YDYUYDYV, YDYVYDYU, YUYDYVYD and YVYDYUYD for YDYC formats. + </para></listitem> + <listitem><para>The number of bits per pixel component. All components are + transferred on the same number of bits. Common values are 8, 10 and 12.</para> + </listitem> + <listitem><para>The number of bus samples per pixel. Pixels that are wider than + the bus width must be transferred in multiple samples. Common values are + 1, 1.5 (encoded as 1_5) and 2.</para></listitem> + <listitem><para>The bus width. When the bus width is larger than the number of + bits per pixel component, several components are packed in a single bus + sample. The components are ordered as specified by the order code, with + components on the left of the code transferred in the high order bits. + Common values are 8 and 16.</para> + </listitem> + </itemizedlist> + </para> + + <para>For instance, a format where pixels are encoded as 8-bit YUV values + downsampled to 4:2:2 and transferred as 2 8-bit bus samples per pixel in the + U, Y, V, Y order will be named <constant>V4L2_MBUS_FMT_UYVY8_2X8</constant>. + </para> + + <para><xref linkend="v4l2-mbus-pixelcode-yuv8"/> lists existing packed YUV + formats and describes the organization of each pixel data in each sample. + When a format pattern is split across multiple samples each of the samples + in the pattern is described.</para> + + <para>The role of each bit transferred over the bus is identified by one + of the following codes.</para> + + <itemizedlist> + <listitem><para>y<subscript>x</subscript> for luma component bit number x</para></listitem> + <listitem><para>u<subscript>x</subscript> for blue chroma component bit number x</para></listitem> + <listitem><para>v<subscript>x</subscript> for red chroma component bit number x</para></listitem> + <listitem><para>a<subscript>x</subscript> for alpha component bit number x</para></listitem> + <listitem><para>- for non-available bits (for positions higher than the bus width)</para></listitem> + <listitem><para>d for dummy bits</para></listitem> + </itemizedlist> + + <table pgwide="0" frame="none" id="v4l2-mbus-pixelcode-yuv8"> + <title>YUV Formats</title> + <tgroup cols="23"> + <colspec colname="id" align="left" /> + <colspec colname="code" align="center"/> + <colspec colname="bit" /> + <colspec colnum="4" colname="b31" align="center" /> + <colspec colnum="5" colname="b20" align="center" /> + <colspec colnum="6" colname="b29" align="center" /> + <colspec colnum="7" colname="b28" align="center" /> + <colspec colnum="8" colname="b27" align="center" /> + <colspec colnum="9" colname="b26" align="center" /> + <colspec colnum="10" colname="b25" align="center" /> + <colspec colnum="11" colname="b24" align="center" /> + <colspec colnum="12" colname="b23" align="center" /> + <colspec colnum="13" colname="b22" align="center" /> + <colspec colnum="14" colname="b21" align="center" /> + <colspec colnum="15" colname="b20" align="center" /> + <colspec colnum="16" colname="b19" align="center" /> + <colspec colnum="17" colname="b18" align="center" /> + <colspec colnum="18" colname="b17" align="center" /> + <colspec colnum="19" colname="b16" align="center" /> + <colspec colnum="20" colname="b15" align="center" /> + <colspec colnum="21" colname="b14" align="center" /> + <colspec colnum="22" colname="b13" align="center" /> + <colspec colnum="23" colname="b12" align="center" /> + <colspec colnum="24" colname="b11" align="center" /> + <colspec colnum="25" colname="b10" align="center" /> + <colspec colnum="26" colname="b09" align="center" /> + <colspec colnum="27" colname="b08" align="center" /> + <colspec colnum="28" colname="b07" align="center" /> + <colspec colnum="29" colname="b06" align="center" /> + <colspec colnum="30" colname="b05" align="center" /> + <colspec colnum="31" colname="b04" align="center" /> + <colspec colnum="32" colname="b03" align="center" /> + <colspec colnum="33" colname="b02" align="center" /> + <colspec colnum="34" colname="b01" align="center" /> + <colspec colnum="35" colname="b00" align="center" /> + <spanspec namest="b31" nameend="b00" spanname="b0" /> + <thead> + <row> + <entry>Identifier</entry> + <entry>Code</entry> + <entry></entry> + <entry spanname="b0">Data organization</entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry>Bit</entry> + <entry>31</entry> + <entry>30</entry> + <entry>29</entry> + <entry>28</entry> + <entry>27</entry> + <entry>26</entry> + <entry>25</entry> + <entry>24</entry> + <entry>23</entry> + <entry>22</entry> + <entry>21</entry> + <entry>10</entry> + <entry>19</entry> + <entry>18</entry> + <entry>17</entry> + <entry>16</entry> + <entry>15</entry> + <entry>14</entry> + <entry>13</entry> + <entry>12</entry> + <entry>11</entry> + <entry>10</entry> + <entry>9</entry> + <entry>8</entry> + <entry>7</entry> + <entry>6</entry> + <entry>5</entry> + <entry>4</entry> + <entry>3</entry> + <entry>2</entry> + <entry>1</entry> + <entry>0</entry> + </row> + </thead> + <tbody valign="top"> + <row id="V4L2-MBUS-FMT-Y8-1X8"> + <entry>V4L2_MBUS_FMT_Y8_1X8</entry> + <entry>0x2001</entry> + <entry></entry> + &dash-ent-24; + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-UV8-1X8"> + <entry>V4L2_MBUS_FMT_UV8_1X8</entry> + <entry>0x2015</entry> + <entry></entry> + &dash-ent-24; + <entry>u<subscript>7</subscript></entry> + <entry>u<subscript>6</subscript></entry> + <entry>u<subscript>5</subscript></entry> + <entry>u<subscript>4</subscript></entry> + <entry>u<subscript>3</subscript></entry> + <entry>u<subscript>2</subscript></entry> + <entry>u<subscript>1</subscript></entry> + <entry>u<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>v<subscript>7</subscript></entry> + <entry>v<subscript>6</subscript></entry> + <entry>v<subscript>5</subscript></entry> + <entry>v<subscript>4</subscript></entry> + <entry>v<subscript>3</subscript></entry> + <entry>v<subscript>2</subscript></entry> + <entry>v<subscript>1</subscript></entry> + <entry>v<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-UYVY8-1_5X8"> + <entry>V4L2_MBUS_FMT_UYVY8_1_5X8</entry> + <entry>0x2002</entry> + <entry></entry> + &dash-ent-24; + <entry>u<subscript>7</subscript></entry> + <entry>u<subscript>6</subscript></entry> + <entry>u<subscript>5</subscript></entry> + <entry>u<subscript>4</subscript></entry> + <entry>u<subscript>3</subscript></entry> + <entry>u<subscript>2</subscript></entry> + <entry>u<subscript>1</subscript></entry> + <entry>u<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>v<subscript>7</subscript></entry> + <entry>v<subscript>6</subscript></entry> + <entry>v<subscript>5</subscript></entry> + <entry>v<subscript>4</subscript></entry> + <entry>v<subscript>3</subscript></entry> + <entry>v<subscript>2</subscript></entry> + <entry>v<subscript>1</subscript></entry> + <entry>v<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-VYUY8-1_5X8"> + <entry>V4L2_MBUS_FMT_VYUY8_1_5X8</entry> + <entry>0x2003</entry> + <entry></entry> + &dash-ent-24; + <entry>v<subscript>7</subscript></entry> + <entry>v<subscript>6</subscript></entry> + <entry>v<subscript>5</subscript></entry> + <entry>v<subscript>4</subscript></entry> + <entry>v<subscript>3</subscript></entry> + <entry>v<subscript>2</subscript></entry> + <entry>v<subscript>1</subscript></entry> + <entry>v<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>u<subscript>7</subscript></entry> + <entry>u<subscript>6</subscript></entry> + <entry>u<subscript>5</subscript></entry> + <entry>u<subscript>4</subscript></entry> + <entry>u<subscript>3</subscript></entry> + <entry>u<subscript>2</subscript></entry> + <entry>u<subscript>1</subscript></entry> + <entry>u<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-YUYV8-1_5X8"> + <entry>V4L2_MBUS_FMT_YUYV8_1_5X8</entry> + <entry>0x2004</entry> + <entry></entry> + &dash-ent-24; + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>u<subscript>7</subscript></entry> + <entry>u<subscript>6</subscript></entry> + <entry>u<subscript>5</subscript></entry> + <entry>u<subscript>4</subscript></entry> + <entry>u<subscript>3</subscript></entry> + <entry>u<subscript>2</subscript></entry> + <entry>u<subscript>1</subscript></entry> + <entry>u<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>v<subscript>7</subscript></entry> + <entry>v<subscript>6</subscript></entry> + <entry>v<subscript>5</subscript></entry> + <entry>v<subscript>4</subscript></entry> + <entry>v<subscript>3</subscript></entry> + <entry>v<subscript>2</subscript></entry> + <entry>v<subscript>1</subscript></entry> + <entry>v<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-YVYU8-1_5X8"> + <entry>V4L2_MBUS_FMT_YVYU8_1_5X8</entry> + <entry>0x2005</entry> + <entry></entry> + &dash-ent-24; + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>v<subscript>7</subscript></entry> + <entry>v<subscript>6</subscript></entry> + <entry>v<subscript>5</subscript></entry> + <entry>v<subscript>4</subscript></entry> + <entry>v<subscript>3</subscript></entry> + <entry>v<subscript>2</subscript></entry> + <entry>v<subscript>1</subscript></entry> + <entry>v<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>u<subscript>7</subscript></entry> + <entry>u<subscript>6</subscript></entry> + <entry>u<subscript>5</subscript></entry> + <entry>u<subscript>4</subscript></entry> + <entry>u<subscript>3</subscript></entry> + <entry>u<subscript>2</subscript></entry> + <entry>u<subscript>1</subscript></entry> + <entry>u<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-UYVY8-2X8"> + <entry>V4L2_MBUS_FMT_UYVY8_2X8</entry> + <entry>0x2006</entry> + <entry></entry> + &dash-ent-24; + <entry>u<subscript>7</subscript></entry> + <entry>u<subscript>6</subscript></entry> + <entry>u<subscript>5</subscript></entry> + <entry>u<subscript>4</subscript></entry> + <entry>u<subscript>3</subscript></entry> + <entry>u<subscript>2</subscript></entry> + <entry>u<subscript>1</subscript></entry> + <entry>u<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>v<subscript>7</subscript></entry> + <entry>v<subscript>6</subscript></entry> + <entry>v<subscript>5</subscript></entry> + <entry>v<subscript>4</subscript></entry> + <entry>v<subscript>3</subscript></entry> + <entry>v<subscript>2</subscript></entry> + <entry>v<subscript>1</subscript></entry> + <entry>v<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-VYUY8-2X8"> + <entry>V4L2_MBUS_FMT_VYUY8_2X8</entry> + <entry>0x2007</entry> + <entry></entry> + &dash-ent-24; + <entry>v<subscript>7</subscript></entry> + <entry>v<subscript>6</subscript></entry> + <entry>v<subscript>5</subscript></entry> + <entry>v<subscript>4</subscript></entry> + <entry>v<subscript>3</subscript></entry> + <entry>v<subscript>2</subscript></entry> + <entry>v<subscript>1</subscript></entry> + <entry>v<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>u<subscript>7</subscript></entry> + <entry>u<subscript>6</subscript></entry> + <entry>u<subscript>5</subscript></entry> + <entry>u<subscript>4</subscript></entry> + <entry>u<subscript>3</subscript></entry> + <entry>u<subscript>2</subscript></entry> + <entry>u<subscript>1</subscript></entry> + <entry>u<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-YUYV8-2X8"> + <entry>V4L2_MBUS_FMT_YUYV8_2X8</entry> + <entry>0x2008</entry> + <entry></entry> + &dash-ent-24; + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>u<subscript>7</subscript></entry> + <entry>u<subscript>6</subscript></entry> + <entry>u<subscript>5</subscript></entry> + <entry>u<subscript>4</subscript></entry> + <entry>u<subscript>3</subscript></entry> + <entry>u<subscript>2</subscript></entry> + <entry>u<subscript>1</subscript></entry> + <entry>u<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>v<subscript>7</subscript></entry> + <entry>v<subscript>6</subscript></entry> + <entry>v<subscript>5</subscript></entry> + <entry>v<subscript>4</subscript></entry> + <entry>v<subscript>3</subscript></entry> + <entry>v<subscript>2</subscript></entry> + <entry>v<subscript>1</subscript></entry> + <entry>v<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-YVYU8-2X8"> + <entry>V4L2_MBUS_FMT_YVYU8_2X8</entry> + <entry>0x2009</entry> + <entry></entry> + &dash-ent-24; + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>v<subscript>7</subscript></entry> + <entry>v<subscript>6</subscript></entry> + <entry>v<subscript>5</subscript></entry> + <entry>v<subscript>4</subscript></entry> + <entry>v<subscript>3</subscript></entry> + <entry>v<subscript>2</subscript></entry> + <entry>v<subscript>1</subscript></entry> + <entry>v<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-24; + <entry>u<subscript>7</subscript></entry> + <entry>u<subscript>6</subscript></entry> + <entry>u<subscript>5</subscript></entry> + <entry>u<subscript>4</subscript></entry> + <entry>u<subscript>3</subscript></entry> + <entry>u<subscript>2</subscript></entry> + <entry>u<subscript>1</subscript></entry> + <entry>u<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-Y10-1X10"> + <entry>V4L2_MBUS_FMT_Y10_1X10</entry> + <entry>0x200a</entry> + <entry></entry> + &dash-ent-22; + <entry>y<subscript>9</subscript></entry> + <entry>y<subscript>8</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-UYVY10-2X10"> + <entry>V4L2_MBUS_FMT_UYVY10_2X10</entry> + <entry>0x2018</entry> + <entry></entry> + &dash-ent-22; + <entry>u<subscript>9</subscript></entry> + <entry>u<subscript>8</subscript></entry> + <entry>u<subscript>7</subscript></entry> + <entry>u<subscript>6</subscript></entry> + <entry>u<subscript>5</subscript></entry> + <entry>u<subscript>4</subscript></entry> + <entry>u<subscript>3</subscript></entry> + <entry>u<subscript>2</subscript></entry> + <entry>u<subscript>1</subscript></entry> + <entry>u<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-22; + <entry>y<subscript>9</subscript></entry> + <entry>y<subscript>8</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-22; + <entry>v<subscript>9</subscript></entry> + <entry>v<subscript>8</subscript></entry> + <entry>v<subscript>7</subscript></entry> + <entry>v<subscript>6</subscript></entry> + <entry>v<subscript>5</subscript></entry> + <entry>v<subscript>4</subscript></entry> + <entry>v<subscript>3</subscript></entry> + <entry>v<subscript>2</subscript></entry> + <entry>v<subscript>1</subscript></entry> + <entry>v<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-22; + <entry>y<subscript>9</subscript></entry> + <entry>y<subscript>8</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-VYUY10-2X10"> + <entry>V4L2_MBUS_FMT_VYUY10_2X10</entry> + <entry>0x2019</entry> + <entry></entry> + &dash-ent-22; + <entry>v<subscript>9</subscript></entry> + <entry>v<subscript>8</subscript></entry> + <entry>v<subscript>7</subscript></entry> + <entry>v<subscript>6</subscript></entry> + <entry>v<subscript>5</subscript></entry> + <entry>v<subscript>4</subscript></entry> + <entry>v<subscript>3</subscript></entry> + <entry>v<subscript>2</subscript></entry> + <entry>v<subscript>1</subscript></entry> + <entry>v<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-22; + <entry>y<subscript>9</subscript></entry> + <entry>y<subscript>8</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-22; + <entry>u<subscript>9</subscript></entry> + <entry>u<subscript>8</subscript></entry> + <entry>u<subscript>7</subscript></entry> + <entry>u<subscript>6</subscript></entry> + <entry>u<subscript>5</subscript></entry> + <entry>u<subscript>4</subscript></entry> + <entry>u<subscript>3</subscript></entry> + <entry>u<subscript>2</subscript></entry> + <entry>u<subscript>1</subscript></entry> + <entry>u<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-22; + <entry>y<subscript>9</subscript></entry> + <entry>y<subscript>8</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-YUYV10-2X10"> + <entry>V4L2_MBUS_FMT_YUYV10_2X10</entry> + <entry>0x200b</entry> + <entry></entry> + &dash-ent-22; + <entry>y<subscript>9</subscript></entry> + <entry>y<subscript>8</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-22; + <entry>u<subscript>9</subscript></entry> + <entry>u<subscript>8</subscript></entry> + <entry>u<subscript>7</subscript></entry> + <entry>u<subscript>6</subscript></entry> + <entry>u<subscript>5</subscript></entry> + <entry>u<subscript>4</subscript></entry> + <entry>u<subscript>3</subscript></entry> + <entry>u<subscript>2</subscript></entry> + <entry>u<subscript>1</subscript></entry> + <entry>u<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-22; + <entry>y<subscript>9</subscript></entry> + <entry>y<subscript>8</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-22; + <entry>v<subscript>9</subscript></entry> + <entry>v<subscript>8</subscript></entry> + <entry>v<subscript>7</subscript></entry> + <entry>v<subscript>6</subscript></entry> + <entry>v<subscript>5</subscript></entry> + <entry>v<subscript>4</subscript></entry> + <entry>v<subscript>3</subscript></entry> + <entry>v<subscript>2</subscript></entry> + <entry>v<subscript>1</subscript></entry> + <entry>v<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-YVYU10-2X10"> + <entry>V4L2_MBUS_FMT_YVYU10_2X10</entry> + <entry>0x200c</entry> + <entry></entry> + &dash-ent-22; + <entry>y<subscript>9</subscript></entry> + <entry>y<subscript>8</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-22; + <entry>v<subscript>9</subscript></entry> + <entry>v<subscript>8</subscript></entry> + <entry>v<subscript>7</subscript></entry> + <entry>v<subscript>6</subscript></entry> + <entry>v<subscript>5</subscript></entry> + <entry>v<subscript>4</subscript></entry> + <entry>v<subscript>3</subscript></entry> + <entry>v<subscript>2</subscript></entry> + <entry>v<subscript>1</subscript></entry> + <entry>v<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-22; + <entry>y<subscript>9</subscript></entry> + <entry>y<subscript>8</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-22; + <entry>u<subscript>9</subscript></entry> + <entry>u<subscript>8</subscript></entry> + <entry>u<subscript>7</subscript></entry> + <entry>u<subscript>6</subscript></entry> + <entry>u<subscript>5</subscript></entry> + <entry>u<subscript>4</subscript></entry> + <entry>u<subscript>3</subscript></entry> + <entry>u<subscript>2</subscript></entry> + <entry>u<subscript>1</subscript></entry> + <entry>u<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-Y12-1X12"> + <entry>V4L2_MBUS_FMT_Y12_1X12</entry> + <entry>0x2013</entry> + <entry></entry> + &dash-ent-20; + <entry>y<subscript>11</subscript></entry> + <entry>y<subscript>10</subscript></entry> + <entry>y<subscript>9</subscript></entry> + <entry>y<subscript>8</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-UYVY8-1X16"> + <entry>V4L2_MBUS_FMT_UYVY8_1X16</entry> + <entry>0x200f</entry> + <entry></entry> + &dash-ent-16; + <entry>u<subscript>7</subscript></entry> + <entry>u<subscript>6</subscript></entry> + <entry>u<subscript>5</subscript></entry> + <entry>u<subscript>4</subscript></entry> + <entry>u<subscript>3</subscript></entry> + <entry>u<subscript>2</subscript></entry> + <entry>u<subscript>1</subscript></entry> + <entry>u<subscript>0</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-16; + <entry>v<subscript>7</subscript></entry> + <entry>v<subscript>6</subscript></entry> + <entry>v<subscript>5</subscript></entry> + <entry>v<subscript>4</subscript></entry> + <entry>v<subscript>3</subscript></entry> + <entry>v<subscript>2</subscript></entry> + <entry>v<subscript>1</subscript></entry> + <entry>v<subscript>0</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-VYUY8-1X16"> + <entry>V4L2_MBUS_FMT_VYUY8_1X16</entry> + <entry>0x2010</entry> + <entry></entry> + &dash-ent-16; + <entry>v<subscript>7</subscript></entry> + <entry>v<subscript>6</subscript></entry> + <entry>v<subscript>5</subscript></entry> + <entry>v<subscript>4</subscript></entry> + <entry>v<subscript>3</subscript></entry> + <entry>v<subscript>2</subscript></entry> + <entry>v<subscript>1</subscript></entry> + <entry>v<subscript>0</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-16; + <entry>u<subscript>7</subscript></entry> + <entry>u<subscript>6</subscript></entry> + <entry>u<subscript>5</subscript></entry> + <entry>u<subscript>4</subscript></entry> + <entry>u<subscript>3</subscript></entry> + <entry>u<subscript>2</subscript></entry> + <entry>u<subscript>1</subscript></entry> + <entry>u<subscript>0</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-YUYV8-1X16"> + <entry>V4L2_MBUS_FMT_YUYV8_1X16</entry> + <entry>0x2011</entry> + <entry></entry> + &dash-ent-16; + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + <entry>u<subscript>7</subscript></entry> + <entry>u<subscript>6</subscript></entry> + <entry>u<subscript>5</subscript></entry> + <entry>u<subscript>4</subscript></entry> + <entry>u<subscript>3</subscript></entry> + <entry>u<subscript>2</subscript></entry> + <entry>u<subscript>1</subscript></entry> + <entry>u<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-16; + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + <entry>v<subscript>7</subscript></entry> + <entry>v<subscript>6</subscript></entry> + <entry>v<subscript>5</subscript></entry> + <entry>v<subscript>4</subscript></entry> + <entry>v<subscript>3</subscript></entry> + <entry>v<subscript>2</subscript></entry> + <entry>v<subscript>1</subscript></entry> + <entry>v<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-YVYU8-1X16"> + <entry>V4L2_MBUS_FMT_YVYU8_1X16</entry> + <entry>0x2012</entry> + <entry></entry> + &dash-ent-16; + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + <entry>v<subscript>7</subscript></entry> + <entry>v<subscript>6</subscript></entry> + <entry>v<subscript>5</subscript></entry> + <entry>v<subscript>4</subscript></entry> + <entry>v<subscript>3</subscript></entry> + <entry>v<subscript>2</subscript></entry> + <entry>v<subscript>1</subscript></entry> + <entry>v<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-16; + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + <entry>u<subscript>7</subscript></entry> + <entry>u<subscript>6</subscript></entry> + <entry>u<subscript>5</subscript></entry> + <entry>u<subscript>4</subscript></entry> + <entry>u<subscript>3</subscript></entry> + <entry>u<subscript>2</subscript></entry> + <entry>u<subscript>1</subscript></entry> + <entry>u<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-YDYUYDYV8-1X16"> + <entry>V4L2_MBUS_FMT_YDYUYDYV8_1X16</entry> + <entry>0x2014</entry> + <entry></entry> + &dash-ent-16; + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + <entry>d</entry> + <entry>d</entry> + <entry>d</entry> + <entry>d</entry> + <entry>d</entry> + <entry>d</entry> + <entry>d</entry> + <entry>d</entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-16; + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + <entry>u<subscript>7</subscript></entry> + <entry>u<subscript>6</subscript></entry> + <entry>u<subscript>5</subscript></entry> + <entry>u<subscript>4</subscript></entry> + <entry>u<subscript>3</subscript></entry> + <entry>u<subscript>2</subscript></entry> + <entry>u<subscript>1</subscript></entry> + <entry>u<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-16; + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + <entry>d</entry> + <entry>d</entry> + <entry>d</entry> + <entry>d</entry> + <entry>d</entry> + <entry>d</entry> + <entry>d</entry> + <entry>d</entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-16; + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + <entry>v<subscript>7</subscript></entry> + <entry>v<subscript>6</subscript></entry> + <entry>v<subscript>5</subscript></entry> + <entry>v<subscript>4</subscript></entry> + <entry>v<subscript>3</subscript></entry> + <entry>v<subscript>2</subscript></entry> + <entry>v<subscript>1</subscript></entry> + <entry>v<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-UYVY10-1X20"> + <entry>V4L2_MBUS_FMT_UYVY10_1X20</entry> + <entry>0x201a</entry> + <entry></entry> + &dash-ent-12; + <entry>u<subscript>9</subscript></entry> + <entry>u<subscript>8</subscript></entry> + <entry>u<subscript>7</subscript></entry> + <entry>u<subscript>6</subscript></entry> + <entry>u<subscript>5</subscript></entry> + <entry>u<subscript>4</subscript></entry> + <entry>u<subscript>3</subscript></entry> + <entry>u<subscript>2</subscript></entry> + <entry>u<subscript>1</subscript></entry> + <entry>u<subscript>0</subscript></entry> + <entry>y<subscript>9</subscript></entry> + <entry>y<subscript>8</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-12; + <entry>v<subscript>9</subscript></entry> + <entry>v<subscript>8</subscript></entry> + <entry>v<subscript>7</subscript></entry> + <entry>v<subscript>6</subscript></entry> + <entry>v<subscript>5</subscript></entry> + <entry>v<subscript>4</subscript></entry> + <entry>v<subscript>3</subscript></entry> + <entry>v<subscript>2</subscript></entry> + <entry>v<subscript>1</subscript></entry> + <entry>v<subscript>0</subscript></entry> + <entry>y<subscript>9</subscript></entry> + <entry>y<subscript>8</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-VYUY10-1X20"> + <entry>V4L2_MBUS_FMT_VYUY10_1X20</entry> + <entry>0x201b</entry> + <entry></entry> + &dash-ent-12; + <entry>v<subscript>9</subscript></entry> + <entry>v<subscript>8</subscript></entry> + <entry>v<subscript>7</subscript></entry> + <entry>v<subscript>6</subscript></entry> + <entry>v<subscript>5</subscript></entry> + <entry>v<subscript>4</subscript></entry> + <entry>v<subscript>3</subscript></entry> + <entry>v<subscript>2</subscript></entry> + <entry>v<subscript>1</subscript></entry> + <entry>v<subscript>0</subscript></entry> + <entry>y<subscript>9</subscript></entry> + <entry>y<subscript>8</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-12; + <entry>u<subscript>9</subscript></entry> + <entry>u<subscript>8</subscript></entry> + <entry>u<subscript>7</subscript></entry> + <entry>u<subscript>6</subscript></entry> + <entry>u<subscript>5</subscript></entry> + <entry>u<subscript>4</subscript></entry> + <entry>u<subscript>3</subscript></entry> + <entry>u<subscript>2</subscript></entry> + <entry>u<subscript>1</subscript></entry> + <entry>u<subscript>0</subscript></entry> + <entry>y<subscript>9</subscript></entry> + <entry>y<subscript>8</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-YUYV10-1X20"> + <entry>V4L2_MBUS_FMT_YUYV10_1X20</entry> + <entry>0x200d</entry> + <entry></entry> + &dash-ent-12; + <entry>y<subscript>9</subscript></entry> + <entry>y<subscript>8</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + <entry>u<subscript>9</subscript></entry> + <entry>u<subscript>8</subscript></entry> + <entry>u<subscript>7</subscript></entry> + <entry>u<subscript>6</subscript></entry> + <entry>u<subscript>5</subscript></entry> + <entry>u<subscript>4</subscript></entry> + <entry>u<subscript>3</subscript></entry> + <entry>u<subscript>2</subscript></entry> + <entry>u<subscript>1</subscript></entry> + <entry>u<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-12; + <entry>y<subscript>9</subscript></entry> + <entry>y<subscript>8</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + <entry>v<subscript>9</subscript></entry> + <entry>v<subscript>8</subscript></entry> + <entry>v<subscript>7</subscript></entry> + <entry>v<subscript>6</subscript></entry> + <entry>v<subscript>5</subscript></entry> + <entry>v<subscript>4</subscript></entry> + <entry>v<subscript>3</subscript></entry> + <entry>v<subscript>2</subscript></entry> + <entry>v<subscript>1</subscript></entry> + <entry>v<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-YVYU10-1X20"> + <entry>V4L2_MBUS_FMT_YVYU10_1X20</entry> + <entry>0x200e</entry> + <entry></entry> + &dash-ent-12; + <entry>y<subscript>9</subscript></entry> + <entry>y<subscript>8</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + <entry>v<subscript>9</subscript></entry> + <entry>v<subscript>8</subscript></entry> + <entry>v<subscript>7</subscript></entry> + <entry>v<subscript>6</subscript></entry> + <entry>v<subscript>5</subscript></entry> + <entry>v<subscript>4</subscript></entry> + <entry>v<subscript>3</subscript></entry> + <entry>v<subscript>2</subscript></entry> + <entry>v<subscript>1</subscript></entry> + <entry>v<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-12; + <entry>y<subscript>9</subscript></entry> + <entry>y<subscript>8</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + <entry>u<subscript>9</subscript></entry> + <entry>u<subscript>8</subscript></entry> + <entry>u<subscript>7</subscript></entry> + <entry>u<subscript>6</subscript></entry> + <entry>u<subscript>5</subscript></entry> + <entry>u<subscript>4</subscript></entry> + <entry>u<subscript>3</subscript></entry> + <entry>u<subscript>2</subscript></entry> + <entry>u<subscript>1</subscript></entry> + <entry>u<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-YUV10-1X30"> + <entry>V4L2_MBUS_FMT_YUV10_1X30</entry> + <entry>0x2016</entry> + <entry></entry> + <entry>-</entry> + <entry>-</entry> + <entry>y<subscript>9</subscript></entry> + <entry>y<subscript>8</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + <entry>u<subscript>9</subscript></entry> + <entry>u<subscript>8</subscript></entry> + <entry>u<subscript>7</subscript></entry> + <entry>u<subscript>6</subscript></entry> + <entry>u<subscript>5</subscript></entry> + <entry>u<subscript>4</subscript></entry> + <entry>u<subscript>3</subscript></entry> + <entry>u<subscript>2</subscript></entry> + <entry>u<subscript>1</subscript></entry> + <entry>u<subscript>0</subscript></entry> + <entry>v<subscript>9</subscript></entry> + <entry>v<subscript>8</subscript></entry> + <entry>v<subscript>7</subscript></entry> + <entry>v<subscript>6</subscript></entry> + <entry>v<subscript>5</subscript></entry> + <entry>v<subscript>4</subscript></entry> + <entry>v<subscript>3</subscript></entry> + <entry>v<subscript>2</subscript></entry> + <entry>v<subscript>1</subscript></entry> + <entry>v<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-AYUV8-1X32"> + <entry>V4L2_MBUS_FMT_AYUV8_1X32</entry> + <entry>0x2017</entry> + <entry></entry> + <entry>a<subscript>7</subscript></entry> + <entry>a<subscript>6</subscript></entry> + <entry>a<subscript>5</subscript></entry> + <entry>a<subscript>4</subscript></entry> + <entry>a<subscript>3</subscript></entry> + <entry>a<subscript>2</subscript></entry> + <entry>a<subscript>1</subscript></entry> + <entry>a<subscript>0</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + <entry>u<subscript>7</subscript></entry> + <entry>u<subscript>6</subscript></entry> + <entry>u<subscript>5</subscript></entry> + <entry>u<subscript>4</subscript></entry> + <entry>u<subscript>3</subscript></entry> + <entry>u<subscript>2</subscript></entry> + <entry>u<subscript>1</subscript></entry> + <entry>u<subscript>0</subscript></entry> + <entry>v<subscript>7</subscript></entry> + <entry>v<subscript>6</subscript></entry> + <entry>v<subscript>5</subscript></entry> + <entry>v<subscript>4</subscript></entry> + <entry>v<subscript>3</subscript></entry> + <entry>v<subscript>2</subscript></entry> + <entry>v<subscript>1</subscript></entry> + <entry>v<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-UYVY12-2X12"> + <entry>V4L2_MBUS_FMT_UYVY12_2X12</entry> + <entry>0x201c</entry> + <entry></entry> + &dash-ent-20; + <entry>u<subscript>11</subscript></entry> + <entry>u<subscript>10</subscript></entry> + <entry>u<subscript>9</subscript></entry> + <entry>u<subscript>8</subscript></entry> + <entry>u<subscript>7</subscript></entry> + <entry>u<subscript>6</subscript></entry> + <entry>u<subscript>5</subscript></entry> + <entry>u<subscript>4</subscript></entry> + <entry>u<subscript>3</subscript></entry> + <entry>u<subscript>2</subscript></entry> + <entry>u<subscript>1</subscript></entry> + <entry>u<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-20; + <entry>y<subscript>11</subscript></entry> + <entry>y<subscript>10</subscript></entry> + <entry>y<subscript>9</subscript></entry> + <entry>y<subscript>8</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-20; + <entry>v<subscript>11</subscript></entry> + <entry>v<subscript>10</subscript></entry> + <entry>v<subscript>9</subscript></entry> + <entry>v<subscript>8</subscript></entry> + <entry>v<subscript>7</subscript></entry> + <entry>v<subscript>6</subscript></entry> + <entry>v<subscript>5</subscript></entry> + <entry>v<subscript>4</subscript></entry> + <entry>v<subscript>3</subscript></entry> + <entry>v<subscript>2</subscript></entry> + <entry>v<subscript>1</subscript></entry> + <entry>v<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-20; + <entry>y<subscript>11</subscript></entry> + <entry>y<subscript>10</subscript></entry> + <entry>y<subscript>9</subscript></entry> + <entry>y<subscript>8</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-VYUY12-2X12"> + <entry>V4L2_MBUS_FMT_VYUY12_2X12</entry> + <entry>0x201d</entry> + <entry></entry> + &dash-ent-20; + <entry>v<subscript>11</subscript></entry> + <entry>v<subscript>10</subscript></entry> + <entry>v<subscript>9</subscript></entry> + <entry>v<subscript>8</subscript></entry> + <entry>v<subscript>7</subscript></entry> + <entry>v<subscript>6</subscript></entry> + <entry>v<subscript>5</subscript></entry> + <entry>v<subscript>4</subscript></entry> + <entry>v<subscript>3</subscript></entry> + <entry>v<subscript>2</subscript></entry> + <entry>v<subscript>1</subscript></entry> + <entry>v<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-20; + <entry>y<subscript>11</subscript></entry> + <entry>y<subscript>10</subscript></entry> + <entry>y<subscript>9</subscript></entry> + <entry>y<subscript>8</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-20; + <entry>u<subscript>11</subscript></entry> + <entry>u<subscript>10</subscript></entry> + <entry>u<subscript>9</subscript></entry> + <entry>u<subscript>8</subscript></entry> + <entry>u<subscript>7</subscript></entry> + <entry>u<subscript>6</subscript></entry> + <entry>u<subscript>5</subscript></entry> + <entry>u<subscript>4</subscript></entry> + <entry>u<subscript>3</subscript></entry> + <entry>u<subscript>2</subscript></entry> + <entry>u<subscript>1</subscript></entry> + <entry>u<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-20; + <entry>y<subscript>11</subscript></entry> + <entry>y<subscript>10</subscript></entry> + <entry>y<subscript>9</subscript></entry> + <entry>y<subscript>8</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-YUYV12-2X12"> + <entry>V4L2_MBUS_FMT_YUYV12_2X12</entry> + <entry>0x201e</entry> + <entry></entry> + &dash-ent-20; + <entry>y<subscript>11</subscript></entry> + <entry>y<subscript>10</subscript></entry> + <entry>y<subscript>9</subscript></entry> + <entry>y<subscript>8</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-20; + <entry>u<subscript>11</subscript></entry> + <entry>u<subscript>10</subscript></entry> + <entry>u<subscript>9</subscript></entry> + <entry>u<subscript>8</subscript></entry> + <entry>u<subscript>7</subscript></entry> + <entry>u<subscript>6</subscript></entry> + <entry>u<subscript>5</subscript></entry> + <entry>u<subscript>4</subscript></entry> + <entry>u<subscript>3</subscript></entry> + <entry>u<subscript>2</subscript></entry> + <entry>u<subscript>1</subscript></entry> + <entry>u<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-20; + <entry>y<subscript>11</subscript></entry> + <entry>y<subscript>10</subscript></entry> + <entry>y<subscript>9</subscript></entry> + <entry>y<subscript>8</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-20; + <entry>v<subscript>11</subscript></entry> + <entry>v<subscript>10</subscript></entry> + <entry>v<subscript>9</subscript></entry> + <entry>v<subscript>8</subscript></entry> + <entry>v<subscript>7</subscript></entry> + <entry>v<subscript>6</subscript></entry> + <entry>v<subscript>5</subscript></entry> + <entry>v<subscript>4</subscript></entry> + <entry>v<subscript>3</subscript></entry> + <entry>v<subscript>2</subscript></entry> + <entry>v<subscript>1</subscript></entry> + <entry>v<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-YVYU12-2X12"> + <entry>V4L2_MBUS_FMT_YVYU12_2X12</entry> + <entry>0x201f</entry> + <entry></entry> + &dash-ent-20; + <entry>y<subscript>11</subscript></entry> + <entry>y<subscript>10</subscript></entry> + <entry>y<subscript>9</subscript></entry> + <entry>y<subscript>8</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-20; + <entry>v<subscript>11</subscript></entry> + <entry>v<subscript>10</subscript></entry> + <entry>v<subscript>9</subscript></entry> + <entry>v<subscript>8</subscript></entry> + <entry>v<subscript>7</subscript></entry> + <entry>v<subscript>6</subscript></entry> + <entry>v<subscript>5</subscript></entry> + <entry>v<subscript>4</subscript></entry> + <entry>v<subscript>3</subscript></entry> + <entry>v<subscript>2</subscript></entry> + <entry>v<subscript>1</subscript></entry> + <entry>v<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-20; + <entry>y<subscript>11</subscript></entry> + <entry>y<subscript>10</subscript></entry> + <entry>y<subscript>9</subscript></entry> + <entry>y<subscript>8</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-20; + <entry>u<subscript>11</subscript></entry> + <entry>u<subscript>10</subscript></entry> + <entry>u<subscript>9</subscript></entry> + <entry>u<subscript>8</subscript></entry> + <entry>u<subscript>7</subscript></entry> + <entry>u<subscript>6</subscript></entry> + <entry>u<subscript>5</subscript></entry> + <entry>u<subscript>4</subscript></entry> + <entry>u<subscript>3</subscript></entry> + <entry>u<subscript>2</subscript></entry> + <entry>u<subscript>1</subscript></entry> + <entry>u<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-UYVY12-1X24"> + <entry>V4L2_MBUS_FMT_UYVY12_1X24</entry> + <entry>0x2020</entry> + <entry></entry> + &dash-ent-8; + <entry>u<subscript>11</subscript></entry> + <entry>u<subscript>10</subscript></entry> + <entry>u<subscript>9</subscript></entry> + <entry>u<subscript>8</subscript></entry> + <entry>u<subscript>7</subscript></entry> + <entry>u<subscript>6</subscript></entry> + <entry>u<subscript>5</subscript></entry> + <entry>u<subscript>4</subscript></entry> + <entry>u<subscript>3</subscript></entry> + <entry>u<subscript>2</subscript></entry> + <entry>u<subscript>1</subscript></entry> + <entry>u<subscript>0</subscript></entry> + <entry>y<subscript>11</subscript></entry> + <entry>y<subscript>10</subscript></entry> + <entry>y<subscript>9</subscript></entry> + <entry>y<subscript>8</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-8; + <entry>v<subscript>11</subscript></entry> + <entry>v<subscript>10</subscript></entry> + <entry>v<subscript>9</subscript></entry> + <entry>v<subscript>8</subscript></entry> + <entry>v<subscript>7</subscript></entry> + <entry>v<subscript>6</subscript></entry> + <entry>v<subscript>5</subscript></entry> + <entry>v<subscript>4</subscript></entry> + <entry>v<subscript>3</subscript></entry> + <entry>v<subscript>2</subscript></entry> + <entry>v<subscript>1</subscript></entry> + <entry>v<subscript>0</subscript></entry> + <entry>y<subscript>11</subscript></entry> + <entry>y<subscript>10</subscript></entry> + <entry>y<subscript>9</subscript></entry> + <entry>y<subscript>8</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-VYUY12-1X24"> + <entry>V4L2_MBUS_FMT_VYUY12_1X24</entry> + <entry>0x2021</entry> + <entry></entry> + &dash-ent-8; + <entry>v<subscript>11</subscript></entry> + <entry>v<subscript>10</subscript></entry> + <entry>v<subscript>9</subscript></entry> + <entry>v<subscript>8</subscript></entry> + <entry>v<subscript>7</subscript></entry> + <entry>v<subscript>6</subscript></entry> + <entry>v<subscript>5</subscript></entry> + <entry>v<subscript>4</subscript></entry> + <entry>v<subscript>3</subscript></entry> + <entry>v<subscript>2</subscript></entry> + <entry>v<subscript>1</subscript></entry> + <entry>v<subscript>0</subscript></entry> + <entry>y<subscript>11</subscript></entry> + <entry>y<subscript>10</subscript></entry> + <entry>y<subscript>9</subscript></entry> + <entry>y<subscript>8</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-8; + <entry>u<subscript>11</subscript></entry> + <entry>u<subscript>10</subscript></entry> + <entry>u<subscript>9</subscript></entry> + <entry>u<subscript>8</subscript></entry> + <entry>u<subscript>7</subscript></entry> + <entry>u<subscript>6</subscript></entry> + <entry>u<subscript>5</subscript></entry> + <entry>u<subscript>4</subscript></entry> + <entry>u<subscript>3</subscript></entry> + <entry>u<subscript>2</subscript></entry> + <entry>u<subscript>1</subscript></entry> + <entry>u<subscript>0</subscript></entry> + <entry>y<subscript>11</subscript></entry> + <entry>y<subscript>10</subscript></entry> + <entry>y<subscript>9</subscript></entry> + <entry>y<subscript>8</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-YUYV12-1X24"> + <entry>V4L2_MBUS_FMT_YUYV12_1X24</entry> + <entry>0x2022</entry> + <entry></entry> + &dash-ent-8; + <entry>y<subscript>11</subscript></entry> + <entry>y<subscript>10</subscript></entry> + <entry>y<subscript>9</subscript></entry> + <entry>y<subscript>8</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + <entry>u<subscript>11</subscript></entry> + <entry>u<subscript>10</subscript></entry> + <entry>u<subscript>9</subscript></entry> + <entry>u<subscript>8</subscript></entry> + <entry>u<subscript>7</subscript></entry> + <entry>u<subscript>6</subscript></entry> + <entry>u<subscript>5</subscript></entry> + <entry>u<subscript>4</subscript></entry> + <entry>u<subscript>3</subscript></entry> + <entry>u<subscript>2</subscript></entry> + <entry>u<subscript>1</subscript></entry> + <entry>u<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-8; + <entry>y<subscript>11</subscript></entry> + <entry>y<subscript>10</subscript></entry> + <entry>y<subscript>9</subscript></entry> + <entry>y<subscript>8</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + <entry>v<subscript>11</subscript></entry> + <entry>v<subscript>10</subscript></entry> + <entry>v<subscript>9</subscript></entry> + <entry>v<subscript>8</subscript></entry> + <entry>v<subscript>7</subscript></entry> + <entry>v<subscript>6</subscript></entry> + <entry>v<subscript>5</subscript></entry> + <entry>v<subscript>4</subscript></entry> + <entry>v<subscript>3</subscript></entry> + <entry>v<subscript>2</subscript></entry> + <entry>v<subscript>1</subscript></entry> + <entry>v<subscript>0</subscript></entry> + </row> + <row id="V4L2-MBUS-FMT-YVYU12-1X24"> + <entry>V4L2_MBUS_FMT_YVYU12_1X24</entry> + <entry>0x2023</entry> + <entry></entry> + &dash-ent-8; + <entry>y<subscript>11</subscript></entry> + <entry>y<subscript>10</subscript></entry> + <entry>y<subscript>9</subscript></entry> + <entry>y<subscript>8</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + <entry>v<subscript>11</subscript></entry> + <entry>v<subscript>10</subscript></entry> + <entry>v<subscript>9</subscript></entry> + <entry>v<subscript>8</subscript></entry> + <entry>v<subscript>7</subscript></entry> + <entry>v<subscript>6</subscript></entry> + <entry>v<subscript>5</subscript></entry> + <entry>v<subscript>4</subscript></entry> + <entry>v<subscript>3</subscript></entry> + <entry>v<subscript>2</subscript></entry> + <entry>v<subscript>1</subscript></entry> + <entry>v<subscript>0</subscript></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + &dash-ent-8; + <entry>y<subscript>11</subscript></entry> + <entry>y<subscript>10</subscript></entry> + <entry>y<subscript>9</subscript></entry> + <entry>y<subscript>8</subscript></entry> + <entry>y<subscript>7</subscript></entry> + <entry>y<subscript>6</subscript></entry> + <entry>y<subscript>5</subscript></entry> + <entry>y<subscript>4</subscript></entry> + <entry>y<subscript>3</subscript></entry> + <entry>y<subscript>2</subscript></entry> + <entry>y<subscript>1</subscript></entry> + <entry>y<subscript>0</subscript></entry> + <entry>u<subscript>11</subscript></entry> + <entry>u<subscript>10</subscript></entry> + <entry>u<subscript>9</subscript></entry> + <entry>u<subscript>8</subscript></entry> + <entry>u<subscript>7</subscript></entry> + <entry>u<subscript>6</subscript></entry> + <entry>u<subscript>5</subscript></entry> + <entry>u<subscript>4</subscript></entry> + <entry>u<subscript>3</subscript></entry> + <entry>u<subscript>2</subscript></entry> + <entry>u<subscript>1</subscript></entry> + <entry>u<subscript>0</subscript></entry> + </row> + </tbody> + </tgroup> + </table> + </section> + + <section> + <title>HSV/HSL Formats</title> + + <para>Those formats transfer pixel data as RGB values in a cylindrical-coordinate + system using Hue-Saturation-Value or Hue-Saturation-Lightness components. The + format code is made of the following information. + <itemizedlist> + <listitem><para>The hue, saturation, value or lightness and optional alpha + components order code, as encoded in a pixel sample. The only currently + supported value is AHSV. + </para></listitem> + <listitem><para>The number of bits per component, for each component. The values + can be different for all components. The only currently supported value is 8888. + </para></listitem> + <listitem><para>The number of bus samples per pixel. Pixels that are wider than + the bus width must be transferred in multiple samples. The only currently + supported value is 1.</para></listitem> + <listitem><para>The bus width.</para></listitem> + <listitem><para>For formats where the total number of bits per pixel is smaller + than the number of bus samples per pixel times the bus width, a padding + value stating if the bytes are padded in their most high order bits + (PADHI) or low order bits (PADLO).</para></listitem> + <listitem><para>For formats where the number of bus samples per pixel is larger + than 1, an endianness value stating if the pixel is transferred MSB first + (BE) or LSB first (LE).</para></listitem> + </itemizedlist> + </para> + + <para>The following table lists existing HSV/HSL formats.</para> + + <table pgwide="0" frame="none" id="v4l2-mbus-pixelcode-hsv"> + <title>HSV/HSL formats</title> + <tgroup cols="27"> + <colspec colname="id" align="left" /> + <colspec colname="code" align="center"/> + <colspec colname="bit" /> + <colspec colnum="4" colname="b31" align="center" /> + <colspec colnum="5" colname="b20" align="center" /> + <colspec colnum="6" colname="b29" align="center" /> + <colspec colnum="7" colname="b28" align="center" /> + <colspec colnum="8" colname="b27" align="center" /> + <colspec colnum="9" colname="b26" align="center" /> + <colspec colnum="10" colname="b25" align="center" /> + <colspec colnum="11" colname="b24" align="center" /> + <colspec colnum="12" colname="b23" align="center" /> + <colspec colnum="13" colname="b22" align="center" /> + <colspec colnum="14" colname="b21" align="center" /> + <colspec colnum="15" colname="b20" align="center" /> + <colspec colnum="16" colname="b19" align="center" /> + <colspec colnum="17" colname="b18" align="center" /> + <colspec colnum="18" colname="b17" align="center" /> + <colspec colnum="19" colname="b16" align="center" /> + <colspec colnum="20" colname="b15" align="center" /> + <colspec colnum="21" colname="b14" align="center" /> + <colspec colnum="22" colname="b13" align="center" /> + <colspec colnum="23" colname="b12" align="center" /> + <colspec colnum="24" colname="b11" align="center" /> + <colspec colnum="25" colname="b10" align="center" /> + <colspec colnum="26" colname="b09" align="center" /> + <colspec colnum="27" colname="b08" align="center" /> + <colspec colnum="28" colname="b07" align="center" /> + <colspec colnum="29" colname="b06" align="center" /> + <colspec colnum="30" colname="b05" align="center" /> + <colspec colnum="31" colname="b04" align="center" /> + <colspec colnum="32" colname="b03" align="center" /> + <colspec colnum="33" colname="b02" align="center" /> + <colspec colnum="34" colname="b01" align="center" /> + <colspec colnum="35" colname="b00" align="center" /> + <spanspec namest="b31" nameend="b00" spanname="b0" /> + <thead> + <row> + <entry>Identifier</entry> + <entry>Code</entry> + <entry></entry> + <entry spanname="b0">Data organization</entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry>Bit</entry> + <entry>31</entry> + <entry>30</entry> + <entry>29</entry> + <entry>28</entry> + <entry>27</entry> + <entry>26</entry> + <entry>25</entry> + <entry>24</entry> + <entry>23</entry> + <entry>22</entry> + <entry>21</entry> + <entry>20</entry> + <entry>19</entry> + <entry>18</entry> + <entry>17</entry> + <entry>16</entry> + <entry>15</entry> + <entry>14</entry> + <entry>13</entry> + <entry>12</entry> + <entry>11</entry> + <entry>10</entry> + <entry>9</entry> + <entry>8</entry> + <entry>7</entry> + <entry>6</entry> + <entry>5</entry> + <entry>4</entry> + <entry>3</entry> + <entry>2</entry> + <entry>1</entry> + <entry>0</entry> + </row> + </thead> + <tbody valign="top"> + <row id="V4L2-MBUS-FMT-AHSV8888-1X32"> + <entry>V4L2_MBUS_FMT_AHSV8888_1X32</entry> + <entry>0x6001</entry> + <entry></entry> + <entry>a<subscript>7</subscript></entry> + <entry>a<subscript>6</subscript></entry> + <entry>a<subscript>5</subscript></entry> + <entry>a<subscript>4</subscript></entry> + <entry>a<subscript>3</subscript></entry> + <entry>a<subscript>2</subscript></entry> + <entry>a<subscript>1</subscript></entry> + <entry>a<subscript>0</subscript></entry> + <entry>h<subscript>7</subscript></entry> + <entry>h<subscript>6</subscript></entry> + <entry>h<subscript>5</subscript></entry> + <entry>h<subscript>4</subscript></entry> + <entry>h<subscript>3</subscript></entry> + <entry>h<subscript>2</subscript></entry> + <entry>h<subscript>1</subscript></entry> + <entry>h<subscript>0</subscript></entry> + <entry>s<subscript>7</subscript></entry> + <entry>s<subscript>6</subscript></entry> + <entry>s<subscript>5</subscript></entry> + <entry>s<subscript>4</subscript></entry> + <entry>s<subscript>3</subscript></entry> + <entry>s<subscript>2</subscript></entry> + <entry>s<subscript>1</subscript></entry> + <entry>s<subscript>0</subscript></entry> + <entry>v<subscript>7</subscript></entry> + <entry>v<subscript>6</subscript></entry> + <entry>v<subscript>5</subscript></entry> + <entry>v<subscript>4</subscript></entry> + <entry>v<subscript>3</subscript></entry> + <entry>v<subscript>2</subscript></entry> + <entry>v<subscript>1</subscript></entry> + <entry>v<subscript>0</subscript></entry> + </row> + </tbody> + </tgroup> + </table> + </section> + + <section> + <title>JPEG Compressed Formats</title> + + <para>Those data formats consist of an ordered sequence of 8-bit bytes + obtained from JPEG compression process. Additionally to the + <constant>_JPEG</constant> postfix the format code is made of + the following information. + <itemizedlist> + <listitem><para>The number of bus samples per entropy encoded byte.</para></listitem> + <listitem><para>The bus width.</para></listitem> + </itemizedlist> + </para> + + <para>For instance, for a JPEG baseline process and an 8-bit bus width + the format will be named <constant>V4L2_MBUS_FMT_JPEG_1X8</constant>. + </para> + + <para>The following table lists existing JPEG compressed formats.</para> + + <table pgwide="0" frame="none" id="v4l2-mbus-pixelcode-jpeg"> + <title>JPEG Formats</title> + <tgroup cols="3"> + <colspec colname="id" align="left" /> + <colspec colname="code" align="left"/> + <colspec colname="remarks" align="left"/> + <thead> + <row> + <entry>Identifier</entry> + <entry>Code</entry> + <entry>Remarks</entry> + </row> + </thead> + <tbody valign="top"> + <row id="V4L2-MBUS-FMT-JPEG-1X8"> + <entry>V4L2_MBUS_FMT_JPEG_1X8</entry> + <entry>0x4001</entry> + <entry>Besides of its usage for the parallel bus this format is + recommended for transmission of JPEG data over MIPI CSI bus + using the User Defined 8-bit Data types. + </entry> + </row> + </tbody> + </tgroup> + </table> + </section> + + <section id="v4l2-mbus-vendor-spec-fmts"> + <title>Vendor and Device Specific Formats</title> + + <note> + <title>Experimental</title> + <para>This is an <link linkend="experimental">experimental</link> +interface and may change in the future.</para> + </note> + + <para>This section lists complex data formats that are either vendor or + device specific. + </para> + + <para>The following table lists the existing vendor and device specific + formats.</para> + + <table pgwide="0" frame="none" id="v4l2-mbus-pixelcode-vendor-specific"> + <title>Vendor and device specific formats</title> + <tgroup cols="3"> + <colspec colname="id" align="left" /> + <colspec colname="code" align="left"/> + <colspec colname="remarks" align="left"/> + <thead> + <row> + <entry>Identifier</entry> + <entry>Code</entry> + <entry>Comments</entry> + </row> + </thead> + <tbody valign="top"> + <row id="V4L2-MBUS-FMT-S5C-UYVY-JPEG-1X8"> + <entry>V4L2_MBUS_FMT_S5C_UYVY_JPEG_1X8</entry> + <entry>0x5001</entry> + <entry> + Interleaved raw UYVY and JPEG image format with embedded + meta-data used by Samsung S3C73MX camera sensors. + </entry> + </row> + </tbody> + </tgroup> + </table> + </section> + + </section> +</section> diff --git a/Documentation/DocBook/media/v4l/subdev-image-processing-crop.dia b/Documentation/DocBook/media/v4l/subdev-image-processing-crop.dia new file mode 100644 index 00000000000..e32ba5362e1 --- /dev/null +++ b/Documentation/DocBook/media/v4l/subdev-image-processing-crop.dia @@ -0,0 +1,614 @@ +<?xml version="1.0" encoding="UTF-8"?> +<dia:diagram xmlns:dia="http://www.lysator.liu.se/~alla/dia/"> + <dia:diagramdata> + <dia:attribute name="background"> + <dia:color val="#ffffff"/> + </dia:attribute> + <dia:attribute 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VIDIOC_LOG_STATUS ioctl, +the extended control ioctls, major parts of the sliced VBI API, the +MPEG encoder and decoder APIs and the DV Timings API.</contrib> + <affiliation> + <address> + <email>hverkuil@xs4all.nl</email> + </address> + </affiliation> + </author> + + <author> + <firstname>Martin</firstname> + <surname>Rubli</surname> + <!-- + <affiliation> + <address> + <email>martin_rubli@logitech.com</email> + </address> + </affiliation> --> + <contrib>Designed and documented the VIDIOC_ENUM_FRAMESIZES +and VIDIOC_ENUM_FRAMEINTERVALS ioctls.</contrib> + </author> + + <author> + <firstname>Andy</firstname> + <surname>Walls</surname> + <contrib>Documented the fielded V4L2_MPEG_STREAM_VBI_FMT_IVTV +MPEG stream embedded, sliced VBI data format in this specification. +</contrib> + <affiliation> + <address> + <email>awalls@md.metrocast.net</email> + </address> + </affiliation> + </author> + + <author> + <firstname>Mauro</firstname> + <surname>Carvalho Chehab</surname> + <contrib>Documented libv4l, designed and added v4l2grab example, +Remote Controller chapter.</contrib> + <affiliation> + <address> + <email>m.chehab@samsung.com</email> + </address> + </affiliation> + </author> + + <author> + <firstname>Muralidharan</firstname> + <surname>Karicheri</surname> + <contrib>Documented the Digital Video timings API.</contrib> + <affiliation> + <address> + <email>m-karicheri2@ti.com</email> + </address> + </affiliation> + </author> + + <author> + <firstname>Pawel</firstname> + <surname>Osciak</surname> + <contrib>Designed and documented the multi-planar API.</contrib> + <affiliation> + <address> + <email>pawel AT osciak.com</email> + </address> + </affiliation> + </author> + + <author> + <firstname>Sakari</firstname> + <surname>Ailus</surname> + <contrib>Subdev selections API.</contrib> + <affiliation> + <address> + <email>sakari.ailus@iki.fi</email> + </address> + </affiliation> + </author> + <author> + <firstname>Antti</firstname> + <surname>Palosaari</surname> + <contrib>SDR API.</contrib> + <affiliation> + <address> + <email>crope@iki.fi</email> + </address> + </affiliation> + </author> + </authorgroup> + + <copyright> + <year>1999</year> + <year>2000</year> + <year>2001</year> + <year>2002</year> + <year>2003</year> + <year>2004</year> + <year>2005</year> + <year>2006</year> + <year>2007</year> + <year>2008</year> + <year>2009</year> + <year>2010</year> + <year>2011</year> + <year>2012</year> + <year>2013</year> + <year>2014</year> + <holder>Bill Dirks, Michael H. Schimek, Hans Verkuil, Martin +Rubli, Andy Walls, Muralidharan Karicheri, Mauro Carvalho Chehab, + Pawel Osciak</holder> + </copyright> + <legalnotice> + <para>Except when explicitly stated as GPL, programming examples within + this part can be used and distributed without restrictions.</para> + </legalnotice> + <revhistory> + <!-- Put document revisions here, newest first. --> + <!-- API revisions (changes and additions of defines, enums, +structs, ioctls) must be noted in more detail in the history chapter +(compat.xml), along with the possible impact on existing drivers and +applications. --> + + <revision> + <revnumber>3.15</revnumber> + <date>2014-02-03</date> + <authorinitials>hv, ap</authorinitials> + <revremark>Update several sections of "Common API Elements": "Opening and Closing Devices" +"Querying Capabilities", "Application Priority", "Video Inputs and Outputs", "Audio Inputs and Outputs" +"Tuners and Modulators", "Video Standards" and "Digital Video (DV) Timings". Added SDR API. + </revremark> + </revision> + + <revision> + <revnumber>3.14</revnumber> + <date>2013-11-25</date> + <authorinitials>rr</authorinitials> + <revremark>Set width and height as unsigned on v4l2_rect. + </revremark> + </revision> + + <revision> + <revnumber>3.11</revnumber> + <date>2013-05-26</date> + <authorinitials>hv</authorinitials> + <revremark>Remove obsolete VIDIOC_DBG_G_CHIP_IDENT ioctl. + </revremark> + </revision> + + <revision> + <revnumber>3.10</revnumber> + <date>2013-03-25</date> + <authorinitials>hv</authorinitials> + <revremark>Remove obsolete and unused DV_PRESET ioctls: + VIDIOC_G_DV_PRESET, VIDIOC_S_DV_PRESET, VIDIOC_QUERY_DV_PRESET and + VIDIOC_ENUM_DV_PRESET. Remove the related v4l2_input/output capability + flags V4L2_IN_CAP_PRESETS and V4L2_OUT_CAP_PRESETS. Added VIDIOC_DBG_G_CHIP_INFO. + </revremark> + </revision> + + <revision> + <revnumber>3.9</revnumber> + <date>2012-12-03</date> + <authorinitials>sa, sn</authorinitials> + <revremark>Added timestamp types to v4l2_buffer. + Added V4L2_EVENT_CTRL_CH_RANGE control event changes flag. + </revremark> + </revision> + + <revision> + <revnumber>3.6</revnumber> + <date>2012-07-02</date> + <authorinitials>hv</authorinitials> + <revremark>Added VIDIOC_ENUM_FREQ_BANDS. + </revremark> + </revision> + + <revision> + <revnumber>3.5</revnumber> + <date>2012-05-07</date> + <authorinitials>sa, sn, hv</authorinitials> + <revremark>Added V4L2_CTRL_TYPE_INTEGER_MENU and V4L2 subdev + selections API. Improved the description of V4L2_CID_COLORFX + control, added V4L2_CID_COLORFX_CBCR control. + Added camera controls V4L2_CID_AUTO_EXPOSURE_BIAS, + V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE, V4L2_CID_IMAGE_STABILIZATION, + V4L2_CID_ISO_SENSITIVITY, V4L2_CID_ISO_SENSITIVITY_AUTO, + V4L2_CID_EXPOSURE_METERING, V4L2_CID_SCENE_MODE, + V4L2_CID_3A_LOCK, V4L2_CID_AUTO_FOCUS_START, + V4L2_CID_AUTO_FOCUS_STOP, V4L2_CID_AUTO_FOCUS_STATUS + and V4L2_CID_AUTO_FOCUS_RANGE. + Added VIDIOC_ENUM_DV_TIMINGS, VIDIOC_QUERY_DV_TIMINGS and + VIDIOC_DV_TIMINGS_CAP. + </revremark> + </revision> + + <revision> + <revnumber>3.4</revnumber> + <date>2012-01-25</date> + <authorinitials>sn</authorinitials> + <revremark>Added <link linkend="jpeg-controls">JPEG compression + control class.</link> + </revremark> + </revision> + + <revision> + <revnumber>3.3</revnumber> + <date>2012-01-11</date> + <authorinitials>hv</authorinitials> + <revremark>Added device_caps field to struct v4l2_capabilities.</revremark> + </revision> + + <revision> + <revnumber>3.2</revnumber> + <date>2011-08-26</date> + <authorinitials>hv</authorinitials> + <revremark>Added V4L2_CTRL_FLAG_VOLATILE.</revremark> + </revision> + + <revision> + <revnumber>3.1</revnumber> + <date>2011-06-27</date> + <authorinitials>mcc, po, hv</authorinitials> + <revremark>Documented that VIDIOC_QUERYCAP now returns a per-subsystem version instead of a per-driver one. + Standardize an error code for invalid ioctl. + Added V4L2_CTRL_TYPE_BITMASK.</revremark> + </revision> + + <revision> + <revnumber>2.6.39</revnumber> + <date>2011-03-01</date> + <authorinitials>mcc, po</authorinitials> + <revremark>Removed VIDIOC_*_OLD from videodev2.h header and update it to reflect latest changes. Added the <link linkend="planar-apis">multi-planar API</link>.</revremark> + </revision> + + <revision> + <revnumber>2.6.37</revnumber> + <date>2010-08-06</date> + <authorinitials>hv</authorinitials> + <revremark>Removed obsolete vtx (videotext) API.</revremark> + </revision> + + <revision> + <revnumber>2.6.33</revnumber> + <date>2009-12-03</date> + <authorinitials>mk</authorinitials> + <revremark>Added documentation for the Digital Video timings API.</revremark> + </revision> + + <revision> + <revnumber>2.6.32</revnumber> + <date>2009-08-31</date> + <authorinitials>mcc</authorinitials> + <revremark>Now, revisions will match the kernel version where +the V4L2 API changes will be used by the Linux Kernel. +Also added Remote Controller chapter.</revremark> + </revision> + + <revision> + <revnumber>0.29</revnumber> + <date>2009-08-26</date> + <authorinitials>ev</authorinitials> + <revremark>Added documentation for string controls and for FM Transmitter controls.</revremark> + </revision> + + <revision> + <revnumber>0.28</revnumber> + <date>2009-08-26</date> + <authorinitials>gl</authorinitials> + <revremark>Added V4L2_CID_BAND_STOP_FILTER documentation.</revremark> + </revision> + + <revision> + <revnumber>0.27</revnumber> + <date>2009-08-15</date> + <authorinitials>mcc</authorinitials> + <revremark>Added libv4l and Remote Controller documentation; +added v4l2grab and keytable application examples.</revremark> + </revision> + + <revision> + <revnumber>0.26</revnumber> + <date>2009-07-23</date> + <authorinitials>hv</authorinitials> + <revremark>Finalized the RDS capture API. Added modulator and RDS encoder +capabilities. Added support for string controls.</revremark> + </revision> + + <revision> + <revnumber>0.25</revnumber> + <date>2009-01-18</date> + <authorinitials>hv</authorinitials> + <revremark>Added pixel formats VYUY, NV16 and NV61, and changed +the debug ioctls VIDIOC_DBG_G/S_REGISTER and VIDIOC_DBG_G_CHIP_IDENT. +Added camera controls V4L2_CID_ZOOM_ABSOLUTE, V4L2_CID_ZOOM_RELATIVE, +V4L2_CID_ZOOM_CONTINUOUS and V4L2_CID_PRIVACY.</revremark> + </revision> + + <revision> + <revnumber>0.24</revnumber> + <date>2008-03-04</date> + <authorinitials>mhs</authorinitials> + <revremark>Added pixel formats Y16 and SBGGR16, new controls +and a camera controls class. Removed VIDIOC_G/S_MPEGCOMP.</revremark> + </revision> + + <revision> + <revnumber>0.23</revnumber> + <date>2007-08-30</date> + <authorinitials>mhs</authorinitials> + <revremark>Fixed a typo in VIDIOC_DBG_G/S_REGISTER. +Clarified the byte order of packed pixel formats.</revremark> + </revision> + + <revision> + <revnumber>0.22</revnumber> + <date>2007-08-29</date> + <authorinitials>mhs</authorinitials> + <revremark>Added the Video Output Overlay interface, new MPEG +controls, V4L2_FIELD_INTERLACED_TB and V4L2_FIELD_INTERLACED_BT, +VIDIOC_DBG_G/S_REGISTER, VIDIOC_(TRY_)ENCODER_CMD, +VIDIOC_G_CHIP_IDENT, VIDIOC_G_ENC_INDEX, new pixel formats. +Clarifications in the cropping chapter, about RGB pixel formats, the +mmap(), poll(), select(), read() and write() functions. Typographical +fixes.</revremark> + </revision> + + <revision> + <revnumber>0.21</revnumber> + <date>2006-12-19</date> + <authorinitials>mhs</authorinitials> + <revremark>Fixed a link in the VIDIOC_G_EXT_CTRLS section.</revremark> + </revision> + + <revision> + <revnumber>0.20</revnumber> + <date>2006-11-24</date> + <authorinitials>mhs</authorinitials> + <revremark>Clarified the purpose of the audioset field in +struct v4l2_input and v4l2_output.</revremark> + </revision> + + <revision> + <revnumber>0.19</revnumber> + <date>2006-10-19</date> + <authorinitials>mhs</authorinitials> + <revremark>Documented V4L2_PIX_FMT_RGB444.</revremark> + </revision> + + <revision> + <revnumber>0.18</revnumber> + <date>2006-10-18</date> + <authorinitials>mhs</authorinitials> + <revremark>Added the description of extended controls by Hans +Verkuil. Linked V4L2_PIX_FMT_MPEG to V4L2_CID_MPEG_STREAM_TYPE.</revremark> + </revision> + + <revision> + <revnumber>0.17</revnumber> + <date>2006-10-12</date> + <authorinitials>mhs</authorinitials> + <revremark>Corrected V4L2_PIX_FMT_HM12 description.</revremark> + </revision> + + <revision> + <revnumber>0.16</revnumber> + <date>2006-10-08</date> + <authorinitials>mhs</authorinitials> + <revremark>VIDIOC_ENUM_FRAMESIZES and +VIDIOC_ENUM_FRAMEINTERVALS are now part of the API.</revremark> + </revision> + + <revision> + <revnumber>0.15</revnumber> + <date>2006-09-23</date> + <authorinitials>mhs</authorinitials> + <revremark>Cleaned up the bibliography, added BT.653 and +BT.1119. capture.c/start_capturing() for user pointer I/O did not +initialize the buffer index. Documented the V4L MPEG and MJPEG +VID_TYPEs and V4L2_PIX_FMT_SBGGR8. Updated the list of reserved pixel +formats. See the history chapter for API changes.</revremark> + </revision> + + <revision> + <revnumber>0.14</revnumber> + <date>2006-09-14</date> + <authorinitials>mr</authorinitials> + <revremark>Added VIDIOC_ENUM_FRAMESIZES and +VIDIOC_ENUM_FRAMEINTERVALS proposal for frame format enumeration of +digital devices.</revremark> + </revision> + + <revision> + <revnumber>0.13</revnumber> + <date>2006-04-07</date> + <authorinitials>mhs</authorinitials> + <revremark>Corrected the description of struct v4l2_window +clips. New V4L2_STD_ and V4L2_TUNER_MODE_LANG1_LANG2 +defines.</revremark> + </revision> + + <revision> + <revnumber>0.12</revnumber> + <date>2006-02-03</date> + <authorinitials>mhs</authorinitials> + <revremark>Corrected the description of struct +v4l2_captureparm and v4l2_outputparm.</revremark> + </revision> + + <revision> + <revnumber>0.11</revnumber> + <date>2006-01-27</date> + <authorinitials>mhs</authorinitials> + <revremark>Improved the description of struct +v4l2_tuner.</revremark> + </revision> + + <revision> + <revnumber>0.10</revnumber> + <date>2006-01-10</date> + <authorinitials>mhs</authorinitials> + <revremark>VIDIOC_G_INPUT and VIDIOC_S_PARM +clarifications.</revremark> + </revision> + + <revision> + <revnumber>0.9</revnumber> + <date>2005-11-27</date> + <authorinitials>mhs</authorinitials> + <revremark>Improved the 525 line numbering diagram. Hans +Verkuil and I rewrote the sliced VBI section. He also contributed a +VIDIOC_LOG_STATUS page. Fixed VIDIOC_S_STD call in the video standard +selection example. Various updates.</revremark> + </revision> + + <revision> + <revnumber>0.8</revnumber> + <date>2004-10-04</date> + <authorinitials>mhs</authorinitials> + <revremark>Somehow a piece of junk slipped into the capture +example, removed.</revremark> + </revision> + + <revision> + <revnumber>0.7</revnumber> + <date>2004-09-19</date> + <authorinitials>mhs</authorinitials> + <revremark>Fixed video standard selection, control +enumeration, downscaling and aspect example. Added read and user +pointer i/o to video capture example.</revremark> + </revision> + + <revision> + <revnumber>0.6</revnumber> + <date>2004-08-01</date> + <authorinitials>mhs</authorinitials> + <revremark>v4l2_buffer changes, added video capture example, +various corrections.</revremark> + </revision> + + <revision> + <revnumber>0.5</revnumber> + <date>2003-11-05</date> + <authorinitials>mhs</authorinitials> + <revremark>Pixel format erratum.</revremark> + </revision> + + <revision> + <revnumber>0.4</revnumber> + <date>2003-09-17</date> + <authorinitials>mhs</authorinitials> + <revremark>Corrected source and Makefile to generate a PDF. +SGML fixes. Added latest API changes. Closed gaps in the history +chapter.</revremark> + </revision> + + <revision> + <revnumber>0.3</revnumber> + <date>2003-02-05</date> + <authorinitials>mhs</authorinitials> + <revremark>Another draft, more corrections.</revremark> + </revision> + + <revision> + <revnumber>0.2</revnumber> + <date>2003-01-15</date> + <authorinitials>mhs</authorinitials> + <revremark>Second draft, with corrections pointed out by Gerd +Knorr.</revremark> + </revision> + + <revision> + <revnumber>0.1</revnumber> + <date>2002-12-01</date> + <authorinitials>mhs</authorinitials> + <revremark>First draft, based on documentation by Bill Dirks +and discussions on the V4L mailing list.</revremark> + </revision> + </revhistory> +</partinfo> + +<title>Video for Linux Two API Specification</title> + <subtitle>Revision 3.14</subtitle> + + <chapter id="common"> + &sub-common; + </chapter> + + <chapter id="pixfmt"> + &sub-pixfmt; + </chapter> + + <chapter id="io"> + &sub-io; + </chapter> + + <chapter id="devices"> + <title>Interfaces</title> + + <section id="capture"> &sub-dev-capture; </section> + <section id="overlay"> &sub-dev-overlay; </section> + <section id="output"> &sub-dev-output; </section> + <section id="osd"> &sub-dev-osd; </section> + <section id="codec"> &sub-dev-codec; </section> + <section id="effect"> &sub-dev-effect; </section> + <section id="raw-vbi"> &sub-dev-raw-vbi; </section> + <section id="sliced"> &sub-dev-sliced-vbi; </section> + <section id="ttx"> &sub-dev-teletext; </section> + <section id="radio"> &sub-dev-radio; </section> + <section id="rds"> &sub-dev-rds; </section> + <section id="sdr"> &sub-dev-sdr; </section> + <section id="event"> &sub-dev-event; </section> + <section id="subdev"> &sub-dev-subdev; </section> + </chapter> + + <chapter id="driver"> + &sub-driver; + </chapter> + + <chapter id="libv4l"> + &sub-libv4l; + </chapter> + + <chapter id="compat"> + &sub-compat; + </chapter> + + <appendix id="user-func"> + <title>Function Reference</title> + + <!-- Keep this alphabetically sorted. --> + + &sub-close; + &sub-ioctl; + <!-- All ioctls go here. --> + &sub-create-bufs; + &sub-cropcap; + &sub-dbg-g-chip-info; + &sub-dbg-g-register; + &sub-decoder-cmd; + &sub-dqevent; + &sub-dv-timings-cap; + &sub-encoder-cmd; + &sub-enumaudio; + &sub-enumaudioout; + &sub-enum-dv-timings; + &sub-enum-fmt; + &sub-enum-framesizes; + &sub-enum-frameintervals; + &sub-enum-freq-bands; + &sub-enuminput; + &sub-enumoutput; + &sub-enumstd; + &sub-expbuf; + &sub-g-audio; + &sub-g-audioout; + &sub-g-crop; + &sub-g-ctrl; + &sub-g-dv-timings; + &sub-g-edid; + &sub-g-enc-index; + &sub-g-ext-ctrls; + &sub-g-fbuf; + &sub-g-fmt; + &sub-g-frequency; + &sub-g-input; + &sub-g-jpegcomp; + &sub-g-modulator; + &sub-g-output; + &sub-g-parm; + &sub-g-priority; + &sub-g-selection; + &sub-g-sliced-vbi-cap; + &sub-g-std; + &sub-g-tuner; + &sub-log-status; + &sub-overlay; + &sub-prepare-buf; + &sub-qbuf; + &sub-querybuf; + &sub-querycap; + &sub-queryctrl; + &sub-query-dv-timings; + &sub-querystd; + &sub-reqbufs; + &sub-s-hw-freq-seek; + &sub-streamon; + &sub-subdev-enum-frame-interval; + &sub-subdev-enum-frame-size; + &sub-subdev-enum-mbus-code; + &sub-subdev-g-crop; + &sub-subdev-g-fmt; + &sub-subdev-g-frame-interval; + &sub-subdev-g-selection; + &sub-subscribe-event; + <!-- End of ioctls. --> + &sub-mmap; + &sub-munmap; + &sub-open; + &sub-poll; + &sub-read; + &sub-select; + &sub-write; + </appendix> + + <appendix> + <title>Common definitions for V4L2 and V4L2 subdev interfaces</title> + &sub-selections-common; + </appendix> + + <appendix id="videodev"> + <title>Video For Linux Two Header File</title> + &sub-videodev2-h; + </appendix> + + <appendix id="capture-example"> + <title>Video Capture Example</title> + &sub-capture-c; + </appendix> + + <appendix id="v4l2grab-example"> + <title>Video Grabber example using libv4l</title> + <para>This program demonstrates how to grab V4L2 images in ppm format by +using libv4l handlers. The advantage is that this grabber can potentially work +with any V4L2 driver.</para> + &sub-v4l2grab-c; + </appendix> + + &sub-media-indices; + + &sub-biblio; + diff --git a/Documentation/DocBook/media/v4l/v4l2grab.c.xml b/Documentation/DocBook/media/v4l/v4l2grab.c.xml new file mode 100644 index 00000000000..bed12e40be2 --- /dev/null +++ b/Documentation/DocBook/media/v4l/v4l2grab.c.xml @@ -0,0 +1,164 @@ +<programlisting> +/* V4L2 video picture grabber + Copyright (C) 2009 Mauro Carvalho Chehab <mchehab@infradead.org> + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation version 2 of the License. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + */ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <fcntl.h> +#include <errno.h> +#include <sys/ioctl.h> +#include <sys/types.h> +#include <sys/time.h> +#include <sys/mman.h> +#include <linux/videodev2.h> +#include "../libv4l/include/libv4l2.h" + +#define CLEAR(x) memset(&(x), 0, sizeof(x)) + +struct buffer { + void *start; + size_t length; +}; + +static void xioctl(int fh, int request, void *arg) +{ + int r; + + do { + r = v4l2_ioctl(fh, request, arg); + } while (r == -1 && ((errno == EINTR) || (errno == EAGAIN))); + + if (r == -1) { + fprintf(stderr, "error %d, %s\n", errno, strerror(errno)); + exit(EXIT_FAILURE); + } +} + +int main(int argc, char **argv) +{ + struct <link linkend="v4l2-format">v4l2_format</link> fmt; + struct <link linkend="v4l2-buffer">v4l2_buffer</link> buf; + struct <link linkend="v4l2-requestbuffers">v4l2_requestbuffers</link> req; + enum <link linkend="v4l2-buf-type">v4l2_buf_type</link> type; + fd_set fds; + struct timeval tv; + int r, fd = -1; + unsigned int i, n_buffers; + char *dev_name = "/dev/video0"; + char out_name[256]; + FILE *fout; + struct buffer *buffers; + + fd = v4l2_open(dev_name, O_RDWR | O_NONBLOCK, 0); + if (fd < 0) { + perror("Cannot open device"); + exit(EXIT_FAILURE); + } + + CLEAR(fmt); + fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + fmt.fmt.pix.width = 640; + fmt.fmt.pix.height = 480; + fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_RGB24; + fmt.fmt.pix.field = V4L2_FIELD_INTERLACED; + xioctl(fd, VIDIOC_S_FMT, &fmt); + if (fmt.fmt.pix.pixelformat != V4L2_PIX_FMT_RGB24) { + printf("Libv4l didn't accept RGB24 format. Can't proceed.\n"); + exit(EXIT_FAILURE); + } + if ((fmt.fmt.pix.width != 640) || (fmt.fmt.pix.height != 480)) + printf("Warning: driver is sending image at %dx%d\n", + fmt.fmt.pix.width, fmt.fmt.pix.height); + + CLEAR(req); + req.count = 2; + req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + req.memory = V4L2_MEMORY_MMAP; + xioctl(fd, VIDIOC_REQBUFS, &req); + + buffers = calloc(req.count, sizeof(*buffers)); + for (n_buffers = 0; n_buffers < req.count; ++n_buffers) { + CLEAR(buf); + + buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + buf.memory = V4L2_MEMORY_MMAP; + buf.index = n_buffers; + + xioctl(fd, VIDIOC_QUERYBUF, &buf); + + buffers[n_buffers].length = buf.length; + buffers[n_buffers].start = v4l2_mmap(NULL, buf.length, + PROT_READ | PROT_WRITE, MAP_SHARED, + fd, buf.m.offset); + + if (MAP_FAILED == buffers[n_buffers].start) { + perror("mmap"); + exit(EXIT_FAILURE); + } + } + + for (i = 0; i < n_buffers; ++i) { + CLEAR(buf); + buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + buf.memory = V4L2_MEMORY_MMAP; + buf.index = i; + xioctl(fd, VIDIOC_QBUF, &buf); + } + type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + + xioctl(fd, VIDIOC_STREAMON, &type); + for (i = 0; i < 20; i++) { + do { + FD_ZERO(&fds); + FD_SET(fd, &fds); + + /* Timeout. */ + tv.tv_sec = 2; + tv.tv_usec = 0; + + r = select(fd + 1, &fds, NULL, NULL, &tv); + } while ((r == -1 && (errno = EINTR))); + if (r == -1) { + perror("select"); + return errno; + } + + CLEAR(buf); + buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + buf.memory = V4L2_MEMORY_MMAP; + xioctl(fd, VIDIOC_DQBUF, &buf); + + sprintf(out_name, "out%03d.ppm", i); + fout = fopen(out_name, "w"); + if (!fout) { + perror("Cannot open image"); + exit(EXIT_FAILURE); + } + fprintf(fout, "P6\n%d %d 255\n", + fmt.fmt.pix.width, fmt.fmt.pix.height); + fwrite(buffers[buf.index].start, buf.bytesused, 1, fout); + fclose(fout); + + xioctl(fd, VIDIOC_QBUF, &buf); + } + + type = V4L2_BUF_TYPE_VIDEO_CAPTURE; + xioctl(fd, VIDIOC_STREAMOFF, &type); + for (i = 0; i < n_buffers; ++i) + v4l2_munmap(buffers[i].start, buffers[i].length); + v4l2_close(fd); + + return 0; +} +</programlisting> diff --git a/Documentation/DocBook/media/v4l/vbi_525.pdf b/Documentation/DocBook/media/v4l/vbi_525.pdf Binary files differnew file mode 100644 index 00000000000..9e72c25b208 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vbi_525.pdf diff --git a/Documentation/DocBook/media/v4l/vbi_625.pdf b/Documentation/DocBook/media/v4l/vbi_625.pdf Binary files differnew file mode 100644 index 00000000000..765235e33a4 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vbi_625.pdf diff --git a/Documentation/DocBook/media/v4l/vbi_hsync.pdf b/Documentation/DocBook/media/v4l/vbi_hsync.pdf Binary files differnew file mode 100644 index 00000000000..200b668189b --- /dev/null +++ b/Documentation/DocBook/media/v4l/vbi_hsync.pdf diff --git a/Documentation/DocBook/media/v4l/vidioc-create-bufs.xml b/Documentation/DocBook/media/v4l/vidioc-create-bufs.xml new file mode 100644 index 00000000000..9b700a5f4df --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-create-bufs.xml @@ -0,0 +1,165 @@ +<refentry id="vidioc-create-bufs"> + <refmeta> + <refentrytitle>ioctl VIDIOC_CREATE_BUFS</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_CREATE_BUFS</refname> + <refpurpose>Create buffers for Memory Mapped or User Pointer or DMA Buffer + I/O</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_create_buffers *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_CREATE_BUFS</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <note> + <title>Experimental</title> + <para>This is an <link linkend="experimental"> experimental </link> + interface and may change in the future.</para> + </note> + + <para>This ioctl is used to create buffers for <link linkend="mmap">memory +mapped</link> or <link linkend="userp">user pointer</link> or <link +linkend="dmabuf">DMA buffer</link> I/O. It can be used as an alternative or in +addition to the <constant>VIDIOC_REQBUFS</constant> ioctl, when a tighter +control over buffers is required. This ioctl can be called multiple times to +create buffers of different sizes.</para> + + <para>To allocate the device buffers applications must initialize the +relevant fields of the <structname>v4l2_create_buffers</structname> structure. +The <structfield>count</structfield> field must be set to the number of +requested buffers, the <structfield>memory</structfield> field specifies the +requested I/O method and the <structfield>reserved</structfield> array must be +zeroed.</para> + + <para>The <structfield>format</structfield> field specifies the image format +that the buffers must be able to handle. The application has to fill in this +&v4l2-format;. Usually this will be done using the +<constant>VIDIOC_TRY_FMT</constant> or <constant>VIDIOC_G_FMT</constant> ioctl() +to ensure that the requested format is supported by the driver. Unsupported +formats will result in an error.</para> + + <para>The buffers created by this ioctl will have as minimum size the size +defined by the <structfield>format.pix.sizeimage</structfield> field. If the +<structfield>format.pix.sizeimage</structfield> field is less than the minimum +required for the given format, then <structfield>sizeimage</structfield> will be +increased by the driver to that minimum to allocate the buffers. If it is +larger, then the value will be used as-is. The same applies to the +<structfield>sizeimage</structfield> field of the +<structname>v4l2_plane_pix_format</structname> structure in the case of +multiplanar formats.</para> + + <para>When the ioctl is called with a pointer to this structure the driver +will attempt to allocate up to the requested number of buffers and store the +actual number allocated and the starting index in the +<structfield>count</structfield> and the <structfield>index</structfield> fields +respectively. On return <structfield>count</structfield> can be smaller than +the number requested. The driver may also increase buffer sizes if required, +however, it will not update <structfield>sizeimage</structfield> field values. +The user has to use <constant>VIDIOC_QUERYBUF</constant> to retrieve that +information.</para> + + <table pgwide="1" frame="none" id="v4l2-create-buffers"> + <title>struct <structname>v4l2_create_buffers</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>index</structfield></entry> + <entry>The starting buffer index, returned by the driver.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>count</structfield></entry> + <entry>The number of buffers requested or granted. If count == 0, then + <constant>VIDIOC_CREATE_BUFS</constant> will set <structfield>index</structfield> + to the current number of created buffers, and it will check the validity of + <structfield>memory</structfield> and <structfield>format.type</structfield>. + If those are invalid -1 is returned and errno is set to &EINVAL;, + otherwise <constant>VIDIOC_CREATE_BUFS</constant> returns 0. It will + never set errno to &EBUSY; in this particular case.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>memory</structfield></entry> + <entry>Applications set this field to +<constant>V4L2_MEMORY_MMAP</constant>, +<constant>V4L2_MEMORY_DMABUF</constant> or +<constant>V4L2_MEMORY_USERPTR</constant>. See <xref linkend="v4l2-memory" +/></entry> + </row> + <row> + <entry>&v4l2-format;</entry> + <entry><structfield>format</structfield></entry> + <entry>Filled in by the application, preserved by the driver.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[8]</entry> + <entry>A place holder for future extensions.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>ENOMEM</errorcode></term> + <listitem> + <para>No memory to allocate buffers for <link linkend="mmap">memory +mapped</link> I/O.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The buffer type (<structfield>format.type</structfield> field), +requested I/O method (<structfield>memory</structfield>) or format +(<structfield>format</structfield> field) is not valid.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-cropcap.xml b/Documentation/DocBook/media/v4l/vidioc-cropcap.xml new file mode 100644 index 00000000000..1f5ed64cd75 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-cropcap.xml @@ -0,0 +1,163 @@ +<refentry id="vidioc-cropcap"> + <refmeta> + <refentrytitle>ioctl VIDIOC_CROPCAP</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_CROPCAP</refname> + <refpurpose>Information about the video cropping and scaling abilities</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_cropcap +*<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_CROPCAP</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>Applications use this function to query the cropping +limits, the pixel aspect of images and to calculate scale factors. +They set the <structfield>type</structfield> field of a v4l2_cropcap +structure to the respective buffer (stream) type and call the +<constant>VIDIOC_CROPCAP</constant> ioctl with a pointer to this +structure. Drivers fill the rest of the structure. The results are +constant except when switching the video standard. Remember this +switch can occur implicit when switching the video input or +output.</para> + + <para>This ioctl must be implemented for video capture or output devices that +support cropping and/or scaling and/or have non-square pixels, and for overlay devices.</para> + + <table pgwide="1" frame="none" id="v4l2-cropcap"> + <title>struct <structname>v4l2_cropcap</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>type</structfield></entry> + <entry>Type of the data stream, set by the application. +Only these types are valid here: +<constant>V4L2_BUF_TYPE_VIDEO_CAPTURE</constant>, +<constant>V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE</constant>, +<constant>V4L2_BUF_TYPE_VIDEO_OUTPUT</constant>, +<constant>V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE</constant> and +<constant>V4L2_BUF_TYPE_VIDEO_OVERLAY</constant>. See <xref linkend="v4l2-buf-type" />.</entry> + </row> + <row> + <entry>struct <link linkend="v4l2-rect-crop">v4l2_rect</link></entry> + <entry><structfield>bounds</structfield></entry> + <entry>Defines the window within capturing or output is +possible, this may exclude for example the horizontal and vertical +blanking areas. The cropping rectangle cannot exceed these limits. +Width and height are defined in pixels, the driver writer is free to +choose origin and units of the coordinate system in the analog +domain.</entry> + </row> + <row> + <entry>struct <link linkend="v4l2-rect-crop">v4l2_rect</link></entry> + <entry><structfield>defrect</structfield></entry> + <entry>Default cropping rectangle, it shall cover the +"whole picture". Assuming pixel aspect 1/1 this could be for example a +640 × 480 rectangle for NTSC, a +768 × 576 rectangle for PAL and SECAM centered over +the active picture area. The same co-ordinate system as for + <structfield>bounds</structfield> is used.</entry> + </row> + <row> + <entry>&v4l2-fract;</entry> + <entry><structfield>pixelaspect</structfield></entry> + <entry><para>This is the pixel aspect (y / x) when no +scaling is applied, the ratio of the actual sampling +frequency and the frequency required to get square +pixels.</para><para>When cropping coordinates refer to square pixels, +the driver sets <structfield>pixelaspect</structfield> to 1/1. Other +common values are 54/59 for PAL and SECAM, 11/10 for NTSC sampled +according to [<xref linkend="itu601" />].</para></entry> + </row> + </tbody> + </tgroup> + </table> + + <!-- NB this table is duplicated in the overlay chapter. --> + + <table pgwide="1" frame="none" id="v4l2-rect-crop"> + <title>struct <structname>v4l2_rect</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__s32</entry> + <entry><structfield>left</structfield></entry> + <entry>Horizontal offset of the top, left corner of the +rectangle, in pixels.</entry> + </row> + <row> + <entry>__s32</entry> + <entry><structfield>top</structfield></entry> + <entry>Vertical offset of the top, left corner of the +rectangle, in pixels.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>width</structfield></entry> + <entry>Width of the rectangle, in pixels.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>height</structfield></entry> + <entry>Height of the rectangle, in pixels.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The &v4l2-cropcap; <structfield>type</structfield> is +invalid.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-dbg-g-chip-info.xml b/Documentation/DocBook/media/v4l/vidioc-dbg-g-chip-info.xml new file mode 100644 index 00000000000..4c4603c135f --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-dbg-g-chip-info.xml @@ -0,0 +1,207 @@ +<refentry id="vidioc-dbg-g-chip-info"> + <refmeta> + <refentrytitle>ioctl VIDIOC_DBG_G_CHIP_INFO</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_DBG_G_CHIP_INFO</refname> + <refpurpose>Identify the chips on a TV card</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_dbg_chip_info +*<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_DBG_G_CHIP_INFO</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <note> + <title>Experimental</title> + + <para>This is an <link +linkend="experimental">experimental</link> interface and may change in +the future.</para> + </note> + + <para>For driver debugging purposes this ioctl allows test +applications to query the driver about the chips present on the TV +card. Regular applications must not use it. When you found a chip +specific bug, please contact the linux-media mailing list (&v4l-ml;) +so it can be fixed.</para> + + <para>Additionally the Linux kernel must be compiled with the +<constant>CONFIG_VIDEO_ADV_DEBUG</constant> option to enable this ioctl.</para> + + <para>To query the driver applications must initialize the +<structfield>match.type</structfield> and +<structfield>match.addr</structfield> or <structfield>match.name</structfield> +fields of a &v4l2-dbg-chip-info; +and call <constant>VIDIOC_DBG_G_CHIP_INFO</constant> with a pointer to +this structure. On success the driver stores information about the +selected chip in the <structfield>name</structfield> and +<structfield>flags</structfield> fields.</para> + + <para>When <structfield>match.type</structfield> is +<constant>V4L2_CHIP_MATCH_BRIDGE</constant>, +<structfield>match.addr</structfield> selects the nth bridge 'chip' +on the TV card. You can enumerate all chips by starting at zero and +incrementing <structfield>match.addr</structfield> by one until +<constant>VIDIOC_DBG_G_CHIP_INFO</constant> fails with an &EINVAL;. +The number zero always selects the bridge chip itself, ⪚ the chip +connected to the PCI or USB bus. Non-zero numbers identify specific +parts of the bridge chip such as an AC97 register block.</para> + + <para>When <structfield>match.type</structfield> is +<constant>V4L2_CHIP_MATCH_SUBDEV</constant>, +<structfield>match.addr</structfield> selects the nth sub-device. This +allows you to enumerate over all sub-devices.</para> + + <para>On success, the <structfield>name</structfield> field will +contain a chip name and the <structfield>flags</structfield> field will +contain <constant>V4L2_CHIP_FL_READABLE</constant> if the driver supports +reading registers from the device or <constant>V4L2_CHIP_FL_WRITABLE</constant> +if the driver supports writing registers to the device.</para> + + <para>We recommended the <application>v4l2-dbg</application> +utility over calling this ioctl directly. It is available from the +LinuxTV v4l-dvb repository; see <ulink +url="http://linuxtv.org/repo/">http://linuxtv.org/repo/</ulink> for +access instructions.</para> + + <!-- Note for convenience vidioc-dbg-g-register.sgml + contains a duplicate of this table. --> + <table pgwide="1" frame="none" id="name-v4l2-dbg-match"> + <title>struct <structname>v4l2_dbg_match</structname></title> + <tgroup cols="4"> + &cs-ustr; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>type</structfield></entry> + <entry>See <xref linkend="name-chip-match-types" /> for a list of +possible types.</entry> + </row> + <row> + <entry>union</entry> + <entry>(anonymous)</entry> + </row> + <row> + <entry></entry> + <entry>__u32</entry> + <entry><structfield>addr</structfield></entry> + <entry>Match a chip by this number, interpreted according +to the <structfield>type</structfield> field.</entry> + </row> + <row> + <entry></entry> + <entry>char</entry> + <entry><structfield>name[32]</structfield></entry> + <entry>Match a chip by this name, interpreted according +to the <structfield>type</structfield> field. Currently unused.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="v4l2-dbg-chip-info"> + <title>struct <structname>v4l2_dbg_chip_info</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>struct v4l2_dbg_match</entry> + <entry><structfield>match</structfield></entry> + <entry>How to match the chip, see <xref linkend="name-v4l2-dbg-match" />.</entry> + </row> + <row> + <entry>char</entry> + <entry><structfield>name[32]</structfield></entry> + <entry>The name of the chip.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>flags</structfield></entry> + <entry>Set by the driver. If <constant>V4L2_CHIP_FL_READABLE</constant> +is set, then the driver supports reading registers from the device. If +<constant>V4L2_CHIP_FL_WRITABLE</constant> is set, then it supports writing registers.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved[8]</structfield></entry> + <entry>Reserved fields, both application and driver must set these to 0.</entry> + </row> + </tbody> + </tgroup> + </table> + + <!-- Note for convenience vidioc-dbg-g-register.sgml + contains a duplicate of this table. --> + <table pgwide="1" frame="none" id="name-chip-match-types"> + <title>Chip Match Types</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_CHIP_MATCH_BRIDGE</constant></entry> + <entry>0</entry> + <entry>Match the nth chip on the card, zero for the + bridge chip. Does not match sub-devices.</entry> + </row> + <row> + <entry><constant>V4L2_CHIP_MATCH_SUBDEV</constant></entry> + <entry>4</entry> + <entry>Match the nth sub-device.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The <structfield>match_type</structfield> is invalid or +no device could be matched.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-dbg-g-register.xml b/Documentation/DocBook/media/v4l/vidioc-dbg-g-register.xml new file mode 100644 index 00000000000..3d038e75d12 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-dbg-g-register.xml @@ -0,0 +1,227 @@ +<refentry id="vidioc-dbg-g-register"> + <refmeta> + <refentrytitle>ioctl VIDIOC_DBG_G_REGISTER, VIDIOC_DBG_S_REGISTER</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_DBG_G_REGISTER</refname> + <refname>VIDIOC_DBG_S_REGISTER</refname> + <refpurpose>Read or write hardware registers</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_dbg_register *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>const struct v4l2_dbg_register +*<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_DBG_G_REGISTER, VIDIOC_DBG_S_REGISTER</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <note> + <title>Experimental</title> + + <para>This is an <link linkend="experimental">experimental</link> +interface and may change in the future.</para> + </note> + + <para>For driver debugging purposes these ioctls allow test +applications to access hardware registers directly. Regular +applications must not use them.</para> + + <para>Since writing or even reading registers can jeopardize the +system security, its stability and damage the hardware, both ioctls +require superuser privileges. Additionally the Linux kernel must be +compiled with the <constant>CONFIG_VIDEO_ADV_DEBUG</constant> option +to enable these ioctls.</para> + + <para>To write a register applications must initialize all fields +of a &v4l2-dbg-register; except for <structfield>size</structfield> and call +<constant>VIDIOC_DBG_S_REGISTER</constant> with a pointer to this +structure. The <structfield>match.type</structfield> and +<structfield>match.addr</structfield> or <structfield>match.name</structfield> +fields select a chip on the TV +card, the <structfield>reg</structfield> field specifies a register +number and the <structfield>val</structfield> field the value to be +written into the register.</para> + + <para>To read a register applications must initialize the +<structfield>match.type</structfield>, +<structfield>match.addr</structfield> or <structfield>match.name</structfield> and +<structfield>reg</structfield> fields, and call +<constant>VIDIOC_DBG_G_REGISTER</constant> with a pointer to this +structure. On success the driver stores the register value in the +<structfield>val</structfield> field and the size (in bytes) of the +value in <structfield>size</structfield>.</para> + + <para>When <structfield>match.type</structfield> is +<constant>V4L2_CHIP_MATCH_BRIDGE</constant>, +<structfield>match.addr</structfield> selects the nth non-sub-device chip +on the TV card. The number zero always selects the host chip, ⪚ the +chip connected to the PCI or USB bus. You can find out which chips are +present with the &VIDIOC-DBG-G-CHIP-INFO; ioctl.</para> + + <para>When <structfield>match.type</structfield> is +<constant>V4L2_CHIP_MATCH_SUBDEV</constant>, +<structfield>match.addr</structfield> selects the nth sub-device.</para> + + <para>These ioctls are optional, not all drivers may support them. +However when a driver supports these ioctls it must also support +&VIDIOC-DBG-G-CHIP-INFO;. Conversely it may support +<constant>VIDIOC_DBG_G_CHIP_INFO</constant> but not these ioctls.</para> + + <para><constant>VIDIOC_DBG_G_REGISTER</constant> and +<constant>VIDIOC_DBG_S_REGISTER</constant> were introduced in Linux +2.6.21, but their API was changed to the one described here in kernel 2.6.29.</para> + + <para>We recommended the <application>v4l2-dbg</application> +utility over calling these ioctls directly. It is available from the +LinuxTV v4l-dvb repository; see <ulink +url="http://linuxtv.org/repo/">http://linuxtv.org/repo/</ulink> for +access instructions.</para> + + <!-- Note for convenience vidioc-dbg-g-chip-info.sgml + contains a duplicate of this table. --> + <table pgwide="1" frame="none" id="v4l2-dbg-match"> + <title>struct <structname>v4l2_dbg_match</structname></title> + <tgroup cols="4"> + &cs-ustr; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>type</structfield></entry> + <entry>See <xref linkend="chip-match-types" /> for a list of +possible types.</entry> + </row> + <row> + <entry>union</entry> + <entry>(anonymous)</entry> + </row> + <row> + <entry></entry> + <entry>__u32</entry> + <entry><structfield>addr</structfield></entry> + <entry>Match a chip by this number, interpreted according +to the <structfield>type</structfield> field.</entry> + </row> + <row> + <entry></entry> + <entry>char</entry> + <entry><structfield>name[32]</structfield></entry> + <entry>Match a chip by this name, interpreted according +to the <structfield>type</structfield> field. Currently unused.</entry> + </row> + </tbody> + </tgroup> + </table> + + + <table pgwide="1" frame="none" id="v4l2-dbg-register"> + <title>struct <structname>v4l2_dbg_register</structname></title> + <tgroup cols="4"> + <colspec colname="c1" /> + <colspec colname="c2" /> + <colspec colname="c4" /> + <tbody valign="top"> + <row> + <entry>struct v4l2_dbg_match</entry> + <entry><structfield>match</structfield></entry> + <entry>How to match the chip, see <xref linkend="v4l2-dbg-match" />.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>size</structfield></entry> + <entry>The register size in bytes.</entry> + </row> + <row> + <entry>__u64</entry> + <entry><structfield>reg</structfield></entry> + <entry>A register number.</entry> + </row> + <row> + <entry>__u64</entry> + <entry><structfield>val</structfield></entry> + <entry>The value read from, or to be written into the +register.</entry> + </row> + </tbody> + </tgroup> + </table> + + <!-- Note for convenience vidioc-dbg-g-chip-info.sgml + contains a duplicate of this table. --> + <table pgwide="1" frame="none" id="chip-match-types"> + <title>Chip Match Types</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_CHIP_MATCH_BRIDGE</constant></entry> + <entry>0</entry> + <entry>Match the nth chip on the card, zero for the + bridge chip. Does not match sub-devices.</entry> + </row> + <row> + <entry><constant>V4L2_CHIP_MATCH_SUBDEV</constant></entry> + <entry>4</entry> + <entry>Match the nth sub-device.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EPERM</errorcode></term> + <listitem> + <para>Insufficient permissions. Root privileges are required +to execute these ioctls.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-decoder-cmd.xml b/Documentation/DocBook/media/v4l/vidioc-decoder-cmd.xml new file mode 100644 index 00000000000..9215627b04c --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-decoder-cmd.xml @@ -0,0 +1,249 @@ +<refentry id="vidioc-decoder-cmd"> + <refmeta> + <refentrytitle>ioctl VIDIOC_DECODER_CMD, VIDIOC_TRY_DECODER_CMD</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_DECODER_CMD</refname> + <refname>VIDIOC_TRY_DECODER_CMD</refname> + <refpurpose>Execute an decoder command</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_decoder_cmd *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_DECODER_CMD, VIDIOC_TRY_DECODER_CMD</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>These ioctls control an audio/video (usually MPEG-) decoder. +<constant>VIDIOC_DECODER_CMD</constant> sends a command to the +decoder, <constant>VIDIOC_TRY_DECODER_CMD</constant> can be used to +try a command without actually executing it. To send a command applications +must initialize all fields of a &v4l2-decoder-cmd; and call +<constant>VIDIOC_DECODER_CMD</constant> or <constant>VIDIOC_TRY_DECODER_CMD</constant> +with a pointer to this structure.</para> + + <para>The <structfield>cmd</structfield> field must contain the +command code. Some commands use the <structfield>flags</structfield> field for +additional information. +</para> + + <para>A <function>write</function>() or &VIDIOC-STREAMON; call sends an implicit +START command to the decoder if it has not been started yet. +</para> + + <para>A <function>close</function>() or &VIDIOC-STREAMOFF; call of a streaming +file descriptor sends an implicit immediate STOP command to the decoder, and all +buffered data is discarded.</para> + + <para>These ioctls are optional, not all drivers may support +them. They were introduced in Linux 3.3.</para> + + <table pgwide="1" frame="none" id="v4l2-decoder-cmd"> + <title>struct <structname>v4l2_decoder_cmd</structname></title> + <tgroup cols="5"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>cmd</structfield></entry> + <entry></entry> + <entry></entry> + <entry>The decoder command, see <xref linkend="decoder-cmds" />.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>flags</structfield></entry> + <entry></entry> + <entry></entry> + <entry>Flags to go with the command. If no flags are defined for +this command, drivers and applications must set this field to zero.</entry> + </row> + <row> + <entry>union</entry> + <entry>(anonymous)</entry> + <entry></entry> + <entry></entry> + <entry></entry> + </row> + <row> + <entry></entry> + <entry>struct</entry> + <entry><structfield>start</structfield></entry> + <entry></entry> + <entry>Structure containing additional data for the +<constant>V4L2_DEC_CMD_START</constant> command.</entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry>__s32</entry> + <entry><structfield>speed</structfield></entry> + <entry>Playback speed and direction. The playback speed is defined as +<structfield>speed</structfield>/1000 of the normal speed. So 1000 is normal playback. +Negative numbers denote reverse playback, so -1000 does reverse playback at normal +speed. Speeds -1, 0 and 1 have special meanings: speed 0 is shorthand for 1000 +(normal playback). A speed of 1 steps just one frame forward, a speed of -1 steps +just one frame back. + </entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry>__u32</entry> + <entry><structfield>format</structfield></entry> + <entry>Format restrictions. This field is set by the driver, not the +application. Possible values are <constant>V4L2_DEC_START_FMT_NONE</constant> if +there are no format restrictions or <constant>V4L2_DEC_START_FMT_GOP</constant> +if the decoder operates on full GOPs (<wordasword>Group Of Pictures</wordasword>). +This is usually the case for reverse playback: the decoder needs full GOPs, which +it can then play in reverse order. So to implement reverse playback the application +must feed the decoder the last GOP in the video file, then the GOP before that, etc. etc. + </entry> + </row> + <row> + <entry></entry> + <entry>struct</entry> + <entry><structfield>stop</structfield></entry> + <entry></entry> + <entry>Structure containing additional data for the +<constant>V4L2_DEC_CMD_STOP</constant> command.</entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry>__u64</entry> + <entry><structfield>pts</structfield></entry> + <entry>Stop playback at this <structfield>pts</structfield> or immediately +if the playback is already past that timestamp. Leave to 0 if you want to stop after the +last frame was decoded. + </entry> + </row> + <row> + <entry></entry> + <entry>struct</entry> + <entry><structfield>raw</structfield></entry> + <entry></entry> + <entry></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry>__u32</entry> + <entry><structfield>data</structfield>[16]</entry> + <entry>Reserved for future extensions. Drivers and +applications must set the array to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="decoder-cmds"> + <title>Decoder Commands</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_DEC_CMD_START</constant></entry> + <entry>0</entry> + <entry>Start the decoder. When the decoder is already +running or paused, this command will just change the playback speed. +That means that calling <constant>V4L2_DEC_CMD_START</constant> when +the decoder was paused will <emphasis>not</emphasis> resume the decoder. +You have to explicitly call <constant>V4L2_DEC_CMD_RESUME</constant> for that. +This command has one flag: +<constant>V4L2_DEC_CMD_START_MUTE_AUDIO</constant>. If set, then audio will +be muted when playing back at a non-standard speed. + </entry> + </row> + <row> + <entry><constant>V4L2_DEC_CMD_STOP</constant></entry> + <entry>1</entry> + <entry>Stop the decoder. When the decoder is already stopped, +this command does nothing. This command has two flags: +if <constant>V4L2_DEC_CMD_STOP_TO_BLACK</constant> is set, then the decoder will +set the picture to black after it stopped decoding. Otherwise the last image will +repeat. If <constant>V4L2_DEC_CMD_STOP_IMMEDIATELY</constant> is set, then the decoder +stops immediately (ignoring the <structfield>pts</structfield> value), otherwise it +will keep decoding until timestamp >= pts or until the last of the pending data from +its internal buffers was decoded. +</entry> + </row> + <row> + <entry><constant>V4L2_DEC_CMD_PAUSE</constant></entry> + <entry>2</entry> + <entry>Pause the decoder. When the decoder has not been +started yet, the driver will return an &EPERM;. When the decoder is +already paused, this command does nothing. This command has one flag: +if <constant>V4L2_DEC_CMD_PAUSE_TO_BLACK</constant> is set, then set the +decoder output to black when paused. +</entry> + </row> + <row> + <entry><constant>V4L2_DEC_CMD_RESUME</constant></entry> + <entry>3</entry> + <entry>Resume decoding after a PAUSE command. When the +decoder has not been started yet, the driver will return an &EPERM;. +When the decoder is already running, this command does nothing. No +flags are defined for this command.</entry> + </row> + </tbody> + </tgroup> + </table> + + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The <structfield>cmd</structfield> field is invalid.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EPERM</errorcode></term> + <listitem> + <para>The application sent a PAUSE or RESUME command when +the decoder was not running.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-dqevent.xml b/Documentation/DocBook/media/v4l/vidioc-dqevent.xml new file mode 100644 index 00000000000..820f86e8744 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-dqevent.xml @@ -0,0 +1,310 @@ +<refentry id="vidioc-dqevent"> + <refmeta> + <refentrytitle>ioctl VIDIOC_DQEVENT</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_DQEVENT</refname> + <refpurpose>Dequeue event</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_event +*<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_DQEVENT</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>Dequeue an event from a video device. No input is required + for this ioctl. All the fields of the &v4l2-event; structure are + filled by the driver. The file handle will also receive exceptions + which the application may get by e.g. using the select system + call.</para> + + <table frame="none" pgwide="1" id="v4l2-event"> + <title>struct <structname>v4l2_event</structname></title> + <tgroup cols="4"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>type</structfield></entry> + <entry></entry> + <entry>Type of the event.</entry> + </row> + <row> + <entry>union</entry> + <entry><structfield>u</structfield></entry> + <entry></entry> + <entry></entry> + </row> + <row> + <entry></entry> + <entry>&v4l2-event-vsync;</entry> + <entry><structfield>vsync</structfield></entry> + <entry>Event data for event V4L2_EVENT_VSYNC. + </entry> + </row> + <row> + <entry></entry> + <entry>&v4l2-event-ctrl;</entry> + <entry><structfield>ctrl</structfield></entry> + <entry>Event data for event V4L2_EVENT_CTRL. + </entry> + </row> + <row> + <entry></entry> + <entry>&v4l2-event-frame-sync;</entry> + <entry><structfield>frame_sync</structfield></entry> + <entry>Event data for event V4L2_EVENT_FRAME_SYNC.</entry> + </row> + <row> + <entry></entry> + <entry>__u8</entry> + <entry><structfield>data</structfield>[64]</entry> + <entry>Event data. Defined by the event type. The union + should be used to define easily accessible type for + events.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>pending</structfield></entry> + <entry></entry> + <entry>Number of pending events excluding this one.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>sequence</structfield></entry> + <entry></entry> + <entry>Event sequence number. The sequence number is + incremented for every subscribed event that takes place. + If sequence numbers are not contiguous it means that + events have been lost. + </entry> + </row> + <row> + <entry>struct timespec</entry> + <entry><structfield>timestamp</structfield></entry> + <entry></entry> + <entry>Event timestamp.</entry> + </row> + <row> + <entry>u32</entry> + <entry><structfield>id</structfield></entry> + <entry></entry> + <entry>The ID associated with the event source. If the event does not + have an associated ID (this depends on the event type), then this + is 0.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[8]</entry> + <entry></entry> + <entry>Reserved for future extensions. Drivers must set + the array to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table frame="none" pgwide="1" id="v4l2-event-vsync"> + <title>struct <structname>v4l2_event_vsync</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u8</entry> + <entry><structfield>field</structfield></entry> + <entry>The upcoming field. See &v4l2-field;.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table frame="none" pgwide="1" id="v4l2-event-ctrl"> + <title>struct <structname>v4l2_event_ctrl</structname></title> + <tgroup cols="4"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>changes</structfield></entry> + <entry></entry> + <entry>A bitmask that tells what has changed. See <xref linkend="changes-flags" />.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>type</structfield></entry> + <entry></entry> + <entry>The type of the control. See &v4l2-ctrl-type;.</entry> + </row> + <row> + <entry>union (anonymous)</entry> + <entry></entry> + <entry></entry> + <entry></entry> + </row> + <row> + <entry></entry> + <entry>__s32</entry> + <entry><structfield>value</structfield></entry> + <entry>The 32-bit value of the control for 32-bit control types. + This is 0 for string controls since the value of a string + cannot be passed using &VIDIOC-DQEVENT;.</entry> + </row> + <row> + <entry></entry> + <entry>__s64</entry> + <entry><structfield>value64</structfield></entry> + <entry>The 64-bit value of the control for 64-bit control types.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>flags</structfield></entry> + <entry></entry> + <entry>The control flags. See <xref linkend="control-flags" />.</entry> + </row> + <row> + <entry>__s32</entry> + <entry><structfield>minimum</structfield></entry> + <entry></entry> + <entry>The minimum value of the control. See &v4l2-queryctrl;.</entry> + </row> + <row> + <entry>__s32</entry> + <entry><structfield>maximum</structfield></entry> + <entry></entry> + <entry>The maximum value of the control. See &v4l2-queryctrl;.</entry> + </row> + <row> + <entry>__s32</entry> + <entry><structfield>step</structfield></entry> + <entry></entry> + <entry>The step value of the control. See &v4l2-queryctrl;.</entry> + </row> + <row> + <entry>__s32</entry> + <entry><structfield>default_value</structfield></entry> + <entry></entry> + <entry>The default value value of the control. See &v4l2-queryctrl;.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table frame="none" pgwide="1" id="v4l2-event-frame-sync"> + <title>struct <structname>v4l2_event_frame_sync</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>frame_sequence</structfield></entry> + <entry> + The sequence number of the frame being received. + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table frame="none" pgwide="1" id="v4l2-event-src-change"> + <title>struct <structname>v4l2_event_src_change</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>changes</structfield></entry> + <entry> + A bitmask that tells what has changed. See <xref linkend="src-changes-flags" />. + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="changes-flags"> + <title>Changes</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_EVENT_CTRL_CH_VALUE</constant></entry> + <entry>0x0001</entry> + <entry>This control event was triggered because the value of the control + changed. Special case: if a button control is pressed, then this + event is sent as well, even though there is not explicit value + associated with a button control.</entry> + </row> + <row> + <entry><constant>V4L2_EVENT_CTRL_CH_FLAGS</constant></entry> + <entry>0x0002</entry> + <entry>This control event was triggered because the control flags + changed.</entry> + </row> + <row> + <entry><constant>V4L2_EVENT_CTRL_CH_RANGE</constant></entry> + <entry>0x0004</entry> + <entry>This control event was triggered because the minimum, + maximum, step or the default value of the control changed.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="src-changes-flags"> + <title>Source Changes</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_EVENT_SRC_CH_RESOLUTION</constant></entry> + <entry>0x0001</entry> + <entry>This event gets triggered when a resolution change is + detected at an input. This can come from an input connector or + from a video decoder. + </entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + <refsect1> + &return-value; + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-dv-timings-cap.xml b/Documentation/DocBook/media/v4l/vidioc-dv-timings-cap.xml new file mode 100644 index 00000000000..28a8c1e1c70 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-dv-timings-cap.xml @@ -0,0 +1,222 @@ +<refentry id="vidioc-dv-timings-cap"> + <refmeta> + <refentrytitle>ioctl VIDIOC_DV_TIMINGS_CAP, VIDIOC_SUBDEV_DV_TIMINGS_CAP</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_DV_TIMINGS_CAP</refname> + <refname>VIDIOC_SUBDEV_DV_TIMINGS_CAP</refname> + <refpurpose>The capabilities of the Digital Video receiver/transmitter</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_dv_timings_cap *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_DV_TIMINGS_CAP, VIDIOC_SUBDEV_DV_TIMINGS_CAP</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <note> + <title>Experimental</title> + <para>This is an <link linkend="experimental"> experimental </link> + interface and may change in the future.</para> + </note> + + <para>To query the capabilities of the DV receiver/transmitter applications +can call the <constant>VIDIOC_DV_TIMINGS_CAP</constant> ioctl on a video node +and the driver will fill in the structure. Note that drivers may return +different values after switching the video input or output.</para> + + <para>When implemented by the driver DV capabilities of subdevices can be +queried by calling the <constant>VIDIOC_SUBDEV_DV_TIMINGS_CAP</constant> ioctl +directly on a subdevice node. The capabilities are specific to inputs (for DV +receivers) or outputs (for DV transmitters), applications must specify the +desired pad number in the &v4l2-dv-timings-cap; <structfield>pad</structfield> +field. Attempts to query capabilities on a pad that doesn't support them will +return an &EINVAL;.</para> + + <table pgwide="1" frame="none" id="v4l2-bt-timings-cap"> + <title>struct <structname>v4l2_bt_timings_cap</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>min_width</structfield></entry> + <entry>Minimum width of the active video in pixels.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>max_width</structfield></entry> + <entry>Maximum width of the active video in pixels.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>min_height</structfield></entry> + <entry>Minimum height of the active video in lines.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>max_height</structfield></entry> + <entry>Maximum height of the active video in lines.</entry> + </row> + <row> + <entry>__u64</entry> + <entry><structfield>min_pixelclock</structfield></entry> + <entry>Minimum pixelclock frequency in Hz.</entry> + </row> + <row> + <entry>__u64</entry> + <entry><structfield>max_pixelclock</structfield></entry> + <entry>Maximum pixelclock frequency in Hz.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>standards</structfield></entry> + <entry>The video standard(s) supported by the hardware. + See <xref linkend="dv-bt-standards"/> for a list of standards.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>capabilities</structfield></entry> + <entry>Several flags giving more information about the capabilities. + See <xref linkend="dv-bt-cap-capabilities"/> for a description of the flags. + </entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[16]</entry> + <entry>Reserved for future extensions. Drivers must set the array to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="v4l2-dv-timings-cap"> + <title>struct <structname>v4l2_dv_timings_cap</structname></title> + <tgroup cols="4"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>type</structfield></entry> + <entry>Type of DV timings as listed in <xref linkend="dv-timing-types"/>.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>pad</structfield></entry> + <entry>Pad number as reported by the media controller API. This field + is only used when operating on a subdevice node. When operating on a + video node applications must set this field to zero.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[2]</entry> + <entry>Reserved for future extensions. Drivers must set the array to zero.</entry> + </row> + <row> + <entry>union</entry> + <entry><structfield></structfield></entry> + <entry></entry> + </row> + <row> + <entry></entry> + <entry>&v4l2-bt-timings-cap;</entry> + <entry><structfield>bt</structfield></entry> + <entry>BT.656/1120 timings capabilities of the hardware.</entry> + </row> + <row> + <entry></entry> + <entry>__u32</entry> + <entry><structfield>raw_data</structfield>[32]</entry> + <entry></entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="dv-bt-cap-capabilities"> + <title>DV BT Timing capabilities</title> + <tgroup cols="2"> + &cs-str; + <tbody valign="top"> + <row> + <entry>Flag</entry> + <entry>Description</entry> + </row> + <row> + <entry></entry> + <entry></entry> + </row> + <row> + <entry>V4L2_DV_BT_CAP_INTERLACED</entry> + <entry>Interlaced formats are supported. + </entry> + </row> + <row> + <entry>V4L2_DV_BT_CAP_PROGRESSIVE</entry> + <entry>Progressive formats are supported. + </entry> + </row> + <row> + <entry>V4L2_DV_BT_CAP_REDUCED_BLANKING</entry> + <entry>CVT/GTF specific: the timings can make use of reduced blanking (CVT) +or the 'Secondary GTF' curve (GTF). + </entry> + </row> + <row> + <entry>V4L2_DV_BT_CAP_CUSTOM</entry> + <entry>Can support non-standard timings, i.e. timings not belonging to the +standards set in the <structfield>standards</structfield> field. + </entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + </refsect1> +</refentry> + +<!-- +Local Variables: +mode: sgml +sgml-parent-document: "v4l2.sgml" +indent-tabs-mode: nil +End: +--> diff --git a/Documentation/DocBook/media/v4l/vidioc-encoder-cmd.xml b/Documentation/DocBook/media/v4l/vidioc-encoder-cmd.xml new file mode 100644 index 00000000000..0619ca5d2d3 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-encoder-cmd.xml @@ -0,0 +1,189 @@ +<refentry id="vidioc-encoder-cmd"> + <refmeta> + <refentrytitle>ioctl VIDIOC_ENCODER_CMD, VIDIOC_TRY_ENCODER_CMD</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_ENCODER_CMD</refname> + <refname>VIDIOC_TRY_ENCODER_CMD</refname> + <refpurpose>Execute an encoder command</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_encoder_cmd *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_ENCODER_CMD, VIDIOC_TRY_ENCODER_CMD</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>These ioctls control an audio/video (usually MPEG-) encoder. +<constant>VIDIOC_ENCODER_CMD</constant> sends a command to the +encoder, <constant>VIDIOC_TRY_ENCODER_CMD</constant> can be used to +try a command without actually executing it.</para> + + <para>To send a command applications must initialize all fields of a + &v4l2-encoder-cmd; and call + <constant>VIDIOC_ENCODER_CMD</constant> or + <constant>VIDIOC_TRY_ENCODER_CMD</constant> with a pointer to this + structure.</para> + + <para>The <structfield>cmd</structfield> field must contain the +command code. The <structfield>flags</structfield> field is currently +only used by the STOP command and contains one bit: If the +<constant>V4L2_ENC_CMD_STOP_AT_GOP_END</constant> flag is set, +encoding will continue until the end of the current <wordasword>Group +Of Pictures</wordasword>, otherwise it will stop immediately.</para> + + <para>A <function>read</function>() or &VIDIOC-STREAMON; call sends an implicit +START command to the encoder if it has not been started yet. After a STOP command, +<function>read</function>() calls will read the remaining data +buffered by the driver. When the buffer is empty, +<function>read</function>() will return zero and the next +<function>read</function>() call will restart the encoder.</para> + + <para>A <function>close</function>() or &VIDIOC-STREAMOFF; call of a streaming +file descriptor sends an implicit immediate STOP to the encoder, and all buffered +data is discarded.</para> + + <para>These ioctls are optional, not all drivers may support +them. They were introduced in Linux 2.6.21.</para> + + <table pgwide="1" frame="none" id="v4l2-encoder-cmd"> + <title>struct <structname>v4l2_encoder_cmd</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>cmd</structfield></entry> + <entry>The encoder command, see <xref linkend="encoder-cmds" />.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>flags</structfield></entry> + <entry>Flags to go with the command, see <xref + linkend="encoder-flags" />. If no flags are defined for +this command, drivers and applications must set this field to +zero.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>data</structfield>[8]</entry> + <entry>Reserved for future extensions. Drivers and +applications must set the array to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="encoder-cmds"> + <title>Encoder Commands</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_ENC_CMD_START</constant></entry> + <entry>0</entry> + <entry>Start the encoder. When the encoder is already +running or paused, this command does nothing. No flags are defined for +this command.</entry> + </row> + <row> + <entry><constant>V4L2_ENC_CMD_STOP</constant></entry> + <entry>1</entry> + <entry>Stop the encoder. When the +<constant>V4L2_ENC_CMD_STOP_AT_GOP_END</constant> flag is set, +encoding will continue until the end of the current <wordasword>Group +Of Pictures</wordasword>, otherwise encoding will stop immediately. +When the encoder is already stopped, this command does +nothing.</entry> + </row> + <row> + <entry><constant>V4L2_ENC_CMD_PAUSE</constant></entry> + <entry>2</entry> + <entry>Pause the encoder. When the encoder has not been +started yet, the driver will return an &EPERM;. When the encoder is +already paused, this command does nothing. No flags are defined for +this command.</entry> + </row> + <row> + <entry><constant>V4L2_ENC_CMD_RESUME</constant></entry> + <entry>3</entry> + <entry>Resume encoding after a PAUSE command. When the +encoder has not been started yet, the driver will return an &EPERM;. +When the encoder is already running, this command does nothing. No +flags are defined for this command.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="encoder-flags"> + <title>Encoder Command Flags</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_ENC_CMD_STOP_AT_GOP_END</constant></entry> + <entry>0x0001</entry> + <entry>Stop encoding at the end of the current <wordasword>Group Of +Pictures</wordasword>, rather than immediately.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The <structfield>cmd</structfield> field is invalid.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EPERM</errorcode></term> + <listitem> + <para>The application sent a PAUSE or RESUME command when +the encoder was not running.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-enum-dv-timings.xml b/Documentation/DocBook/media/v4l/vidioc-enum-dv-timings.xml new file mode 100644 index 00000000000..b9fdfeacdbc --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-enum-dv-timings.xml @@ -0,0 +1,141 @@ +<refentry id="vidioc-enum-dv-timings"> + <refmeta> + <refentrytitle>ioctl VIDIOC_ENUM_DV_TIMINGS, VIDIOC_SUBDEV_ENUM_DV_TIMINGS</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_ENUM_DV_TIMINGS</refname> + <refname>VIDIOC_SUBDEV_ENUM_DV_TIMINGS</refname> + <refpurpose>Enumerate supported Digital Video timings</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_enum_dv_timings *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_ENUM_DV_TIMINGS, VIDIOC_SUBDEV_ENUM_DV_TIMINGS</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <note> + <title>Experimental</title> + <para>This is an <link linkend="experimental"> experimental </link> + interface and may change in the future.</para> + </note> + + <para>While some DV receivers or transmitters support a wide range of timings, others +support only a limited number of timings. With this ioctl applications can enumerate a list +of known supported timings. Call &VIDIOC-DV-TIMINGS-CAP; to check if it also supports other +standards or even custom timings that are not in this list.</para> + + <para>To query the available timings, applications initialize the +<structfield>index</structfield> field and zero the reserved array of &v4l2-enum-dv-timings; +and call the <constant>VIDIOC_ENUM_DV_TIMINGS</constant> ioctl on a video node with a +pointer to this structure. Drivers fill the rest of the structure or return an +&EINVAL; when the index is out of bounds. To enumerate all supported DV timings, +applications shall begin at index zero, incrementing by one until the +driver returns <errorcode>EINVAL</errorcode>. Note that drivers may enumerate a +different set of DV timings after switching the video input or +output.</para> + + <para>When implemented by the driver DV timings of subdevices can be queried +by calling the <constant>VIDIOC_SUBDEV_ENUM_DV_TIMINGS</constant> ioctl directly +on a subdevice node. The DV timings are specific to inputs (for DV receivers) or +outputs (for DV transmitters), applications must specify the desired pad number +in the &v4l2-enum-dv-timings; <structfield>pad</structfield> field. Attempts to +enumerate timings on a pad that doesn't support them will return an &EINVAL;.</para> + + <table pgwide="1" frame="none" id="v4l2-enum-dv-timings"> + <title>struct <structname>v4l2_enum_dv_timings</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>index</structfield></entry> + <entry>Number of the DV timings, set by the +application.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>pad</structfield></entry> + <entry>Pad number as reported by the media controller API. This field + is only used when operating on a subdevice node. When operating on a + video node applications must set this field to zero.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[2]</entry> + <entry>Reserved for future extensions. Drivers and applications must + set the array to zero.</entry> + </row> + <row> + <entry>&v4l2-dv-timings;</entry> + <entry><structfield>timings</structfield></entry> + <entry>The timings.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The &v4l2-enum-dv-timings; <structfield>index</structfield> +is out of bounds or the <structfield>pad</structfield> number is invalid.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>ENODATA</errorcode></term> + <listitem> + <para>Digital video presets are not supported for this input or output.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> + +<!-- +Local Variables: +mode: sgml +sgml-parent-document: "v4l2.sgml" +indent-tabs-mode: nil +End: +--> diff --git a/Documentation/DocBook/media/v4l/vidioc-enum-fmt.xml b/Documentation/DocBook/media/v4l/vidioc-enum-fmt.xml new file mode 100644 index 00000000000..f8dfeed34fc --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-enum-fmt.xml @@ -0,0 +1,159 @@ +<refentry id="vidioc-enum-fmt"> + <refmeta> + <refentrytitle>ioctl VIDIOC_ENUM_FMT</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_ENUM_FMT</refname> + <refpurpose>Enumerate image formats</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_fmtdesc +*<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_ENUM_FMT</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>To enumerate image formats applications initialize the +<structfield>type</structfield> and <structfield>index</structfield> +field of &v4l2-fmtdesc; and call the +<constant>VIDIOC_ENUM_FMT</constant> ioctl with a pointer to this +structure. Drivers fill the rest of the structure or return an +&EINVAL;. All formats are enumerable by beginning at index zero and +incrementing by one until <errorcode>EINVAL</errorcode> is +returned.</para> + + <para>Note that after switching input or output the list of enumerated image +formats may be different.</para> + + <table pgwide="1" frame="none" id="v4l2-fmtdesc"> + <title>struct <structname>v4l2_fmtdesc</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>index</structfield></entry> + <entry>Number of the format in the enumeration, set by +the application. This is in no way related to the <structfield> +pixelformat</structfield> field.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>type</structfield></entry> + <entry>Type of the data stream, set by the application. +Only these types are valid here: +<constant>V4L2_BUF_TYPE_VIDEO_CAPTURE</constant>, +<constant>V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE</constant>, +<constant>V4L2_BUF_TYPE_VIDEO_OUTPUT</constant>, +<constant>V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE</constant> and +<constant>V4L2_BUF_TYPE_VIDEO_OVERLAY</constant>. See <xref linkend="v4l2-buf-type" />.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>flags</structfield></entry> + <entry>See <xref linkend="fmtdesc-flags" /></entry> + </row> + <row> + <entry>__u8</entry> + <entry><structfield>description</structfield>[32]</entry> + <entry>Description of the format, a NUL-terminated ASCII +string. This information is intended for the user, for example: "YUV +4:2:2".</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>pixelformat</structfield></entry> + <entry>The image format identifier. This is a +four character code as computed by the v4l2_fourcc() +macro:</entry> + </row> + <row> + <entry spanname="hspan"><para><programlisting id="v4l2-fourcc"> +#define v4l2_fourcc(a,b,c,d) (((__u32)(a)<<0)|((__u32)(b)<<8)|((__u32)(c)<<16)|((__u32)(d)<<24)) +</programlisting></para><para>Several image formats are already +defined by this specification in <xref linkend="pixfmt" />. Note these +codes are not the same as those used in the Windows world.</para></entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[4]</entry> + <entry>Reserved for future extensions. Drivers must set +the array to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="fmtdesc-flags"> + <title>Image Format Description Flags</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_FMT_FLAG_COMPRESSED</constant></entry> + <entry>0x0001</entry> + <entry>This is a compressed format.</entry> + </row> + <row> + <entry><constant>V4L2_FMT_FLAG_EMULATED</constant></entry> + <entry>0x0002</entry> + <entry>This format is not native to the device but emulated +through software (usually libv4l2), where possible try to use a native format +instead for better performance.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The &v4l2-fmtdesc; <structfield>type</structfield> +is not supported or the <structfield>index</structfield> is out of +bounds.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-enum-frameintervals.xml b/Documentation/DocBook/media/v4l/vidioc-enum-frameintervals.xml new file mode 100644 index 00000000000..5fd72c4c33e --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-enum-frameintervals.xml @@ -0,0 +1,259 @@ +<refentry id="vidioc-enum-frameintervals"> + + <refmeta> + <refentrytitle>ioctl VIDIOC_ENUM_FRAMEINTERVALS</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_ENUM_FRAMEINTERVALS</refname> + <refpurpose>Enumerate frame intervals</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_frmivalenum *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_ENUM_FRAMEINTERVALS</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para>Pointer to a &v4l2-frmivalenum; structure that +contains a pixel format and size and receives a frame interval.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>This ioctl allows applications to enumerate all frame +intervals that the device supports for the given pixel format and +frame size.</para> + <para>The supported pixel formats and frame sizes can be obtained +by using the &VIDIOC-ENUM-FMT; and &VIDIOC-ENUM-FRAMESIZES; +functions.</para> + <para>The return value and the content of the +<structfield>v4l2_frmivalenum.type</structfield> field depend on the +type of frame intervals the device supports. Here are the semantics of +the function for the different cases:</para> + <itemizedlist> + <listitem> + <para><emphasis role="bold">Discrete:</emphasis> The function +returns success if the given index value (zero-based) is valid. The +application should increase the index by one for each call until +<constant>EINVAL</constant> is returned. The `v4l2_frmivalenum.type` +field is set to `V4L2_FRMIVAL_TYPE_DISCRETE` by the driver. Of the +union only the `discrete` member is valid.</para> + </listitem> + <listitem> + <para><emphasis role="bold">Step-wise:</emphasis> The function +returns success if the given index value is zero and +<constant>EINVAL</constant> for any other index value. The +<structfield>v4l2_frmivalenum.type</structfield> field is set to +<constant>V4L2_FRMIVAL_TYPE_STEPWISE</constant> by the driver. Of the +union only the <structfield>stepwise</structfield> member is +valid.</para> + </listitem> + <listitem> + <para><emphasis role="bold">Continuous:</emphasis> This is a +special case of the step-wise type above. The function returns success +if the given index value is zero and <constant>EINVAL</constant> for +any other index value. The +<structfield>v4l2_frmivalenum.type</structfield> field is set to +<constant>V4L2_FRMIVAL_TYPE_CONTINUOUS</constant> by the driver. Of +the union only the <structfield>stepwise</structfield> member is valid +and the <structfield>step</structfield> value is set to 1.</para> + </listitem> + </itemizedlist> + + <para>When the application calls the function with index zero, it +must check the <structfield>type</structfield> field to determine the +type of frame interval enumeration the device supports. Only for the +<constant>V4L2_FRMIVAL_TYPE_DISCRETE</constant> type does it make +sense to increase the index value to receive more frame +intervals.</para> + <para>Note that the order in which the frame intervals are +returned has no special meaning. In particular does it not say +anything about potential default frame intervals.</para> + <para>Applications can assume that the enumeration data does not +change without any interaction from the application itself. This means +that the enumeration data is consistent if the application does not +perform any other ioctl calls while it runs the frame interval +enumeration.</para> + </refsect1> + + <refsect1> + <title>Notes</title> + + <itemizedlist> + <listitem> + <para><emphasis role="bold">Frame intervals and frame +rates:</emphasis> The V4L2 API uses frame intervals instead of frame +rates. Given the frame interval the frame rate can be computed as +follows:<screen>frame_rate = 1 / frame_interval</screen></para> + </listitem> + </itemizedlist> + + </refsect1> + + <refsect1> + <title>Structs</title> + + <para>In the structs below, <emphasis>IN</emphasis> denotes a +value that has to be filled in by the application, +<emphasis>OUT</emphasis> denotes values that the driver fills in. The +application should zero out all members except for the +<emphasis>IN</emphasis> fields.</para> + + <table pgwide="1" frame="none" id="v4l2-frmival-stepwise"> + <title>struct <structname>v4l2_frmival_stepwise</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>&v4l2-fract;</entry> + <entry><structfield>min</structfield></entry> + <entry>Minimum frame interval [s].</entry> + </row> + <row> + <entry>&v4l2-fract;</entry> + <entry><structfield>max</structfield></entry> + <entry>Maximum frame interval [s].</entry> + </row> + <row> + <entry>&v4l2-fract;</entry> + <entry><structfield>step</structfield></entry> + <entry>Frame interval step size [s].</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="v4l2-frmivalenum"> + <title>struct <structname>v4l2_frmivalenum</structname></title> + <tgroup cols="4"> + <colspec colname="c1" /> + <colspec colname="c2" /> + <colspec colname="c3" /> + <colspec colname="c4" /> + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>index</structfield></entry> + <entry></entry> + <entry>IN: Index of the given frame interval in the +enumeration.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>pixel_format</structfield></entry> + <entry></entry> + <entry>IN: Pixel format for which the frame intervals are +enumerated.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>width</structfield></entry> + <entry></entry> + <entry>IN: Frame width for which the frame intervals are +enumerated.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>height</structfield></entry> + <entry></entry> + <entry>IN: Frame height for which the frame intervals are +enumerated.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>type</structfield></entry> + <entry></entry> + <entry>OUT: Frame interval type the device supports.</entry> + </row> + <row> + <entry>union</entry> + <entry></entry> + <entry></entry> + <entry>OUT: Frame interval with the given index.</entry> + </row> + <row> + <entry></entry> + <entry>&v4l2-fract;</entry> + <entry><structfield>discrete</structfield></entry> + <entry>Frame interval [s].</entry> + </row> + <row> + <entry></entry> + <entry>&v4l2-frmival-stepwise;</entry> + <entry><structfield>stepwise</structfield></entry> + <entry></entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved[2]</structfield></entry> + <entry></entry> + <entry>Reserved space for future use.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + <title>Enums</title> + + <table pgwide="1" frame="none" id="v4l2-frmivaltypes"> + <title>enum <structname>v4l2_frmivaltypes</structname></title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_FRMIVAL_TYPE_DISCRETE</constant></entry> + <entry>1</entry> + <entry>Discrete frame interval.</entry> + </row> + <row> + <entry><constant>V4L2_FRMIVAL_TYPE_CONTINUOUS</constant></entry> + <entry>2</entry> + <entry>Continuous frame interval.</entry> + </row> + <row> + <entry><constant>V4L2_FRMIVAL_TYPE_STEPWISE</constant></entry> + <entry>3</entry> + <entry>Step-wise defined frame interval.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + </refsect1> + +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-enum-framesizes.xml b/Documentation/DocBook/media/v4l/vidioc-enum-framesizes.xml new file mode 100644 index 00000000000..a78454b5abc --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-enum-framesizes.xml @@ -0,0 +1,264 @@ +<refentry id="vidioc-enum-framesizes"> + + <refmeta> + <refentrytitle>ioctl VIDIOC_ENUM_FRAMESIZES</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_ENUM_FRAMESIZES</refname> + <refpurpose>Enumerate frame sizes</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_frmsizeenum *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_ENUM_FRAMESIZES</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para>Pointer to a &v4l2-frmsizeenum; that contains an index +and pixel format and receives a frame width and height.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>This ioctl allows applications to enumerate all frame sizes +(&ie; width and height in pixels) that the device supports for the +given pixel format.</para> + <para>The supported pixel formats can be obtained by using the +&VIDIOC-ENUM-FMT; function.</para> + <para>The return value and the content of the +<structfield>v4l2_frmsizeenum.type</structfield> field depend on the +type of frame sizes the device supports. Here are the semantics of the +function for the different cases:</para> + + <itemizedlist> + <listitem> + <para><emphasis role="bold">Discrete:</emphasis> The function +returns success if the given index value (zero-based) is valid. The +application should increase the index by one for each call until +<constant>EINVAL</constant> is returned. The +<structfield>v4l2_frmsizeenum.type</structfield> field is set to +<constant>V4L2_FRMSIZE_TYPE_DISCRETE</constant> by the driver. Of the +union only the <structfield>discrete</structfield> member is +valid.</para> + </listitem> + <listitem> + <para><emphasis role="bold">Step-wise:</emphasis> The function +returns success if the given index value is zero and +<constant>EINVAL</constant> for any other index value. The +<structfield>v4l2_frmsizeenum.type</structfield> field is set to +<constant>V4L2_FRMSIZE_TYPE_STEPWISE</constant> by the driver. Of the +union only the <structfield>stepwise</structfield> member is +valid.</para> + </listitem> + <listitem> + <para><emphasis role="bold">Continuous:</emphasis> This is a +special case of the step-wise type above. The function returns success +if the given index value is zero and <constant>EINVAL</constant> for +any other index value. The +<structfield>v4l2_frmsizeenum.type</structfield> field is set to +<constant>V4L2_FRMSIZE_TYPE_CONTINUOUS</constant> by the driver. Of +the union only the <structfield>stepwise</structfield> member is valid +and the <structfield>step_width</structfield> and +<structfield>step_height</structfield> values are set to 1.</para> + </listitem> + </itemizedlist> + + <para>When the application calls the function with index zero, it +must check the <structfield>type</structfield> field to determine the +type of frame size enumeration the device supports. Only for the +<constant>V4L2_FRMSIZE_TYPE_DISCRETE</constant> type does it make +sense to increase the index value to receive more frame sizes.</para> + <para>Note that the order in which the frame sizes are returned +has no special meaning. In particular does it not say anything about +potential default format sizes.</para> + <para>Applications can assume that the enumeration data does not +change without any interaction from the application itself. This means +that the enumeration data is consistent if the application does not +perform any other ioctl calls while it runs the frame size +enumeration.</para> + </refsect1> + + <refsect1> + <title>Structs</title> + + <para>In the structs below, <emphasis>IN</emphasis> denotes a +value that has to be filled in by the application, +<emphasis>OUT</emphasis> denotes values that the driver fills in. The +application should zero out all members except for the +<emphasis>IN</emphasis> fields.</para> + + <table pgwide="1" frame="none" id="v4l2-frmsize-discrete"> + <title>struct <structname>v4l2_frmsize_discrete</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>width</structfield></entry> + <entry>Width of the frame [pixel].</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>height</structfield></entry> + <entry>Height of the frame [pixel].</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="v4l2-frmsize-stepwise"> + <title>struct <structname>v4l2_frmsize_stepwise</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>min_width</structfield></entry> + <entry>Minimum frame width [pixel].</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>max_width</structfield></entry> + <entry>Maximum frame width [pixel].</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>step_width</structfield></entry> + <entry>Frame width step size [pixel].</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>min_height</structfield></entry> + <entry>Minimum frame height [pixel].</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>max_height</structfield></entry> + <entry>Maximum frame height [pixel].</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>step_height</structfield></entry> + <entry>Frame height step size [pixel].</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="v4l2-frmsizeenum"> + <title>struct <structname>v4l2_frmsizeenum</structname></title> + <tgroup cols="4"> + <colspec colname="c1" /> + <colspec colname="c2" /> + <colspec colname="c3" /> + <colspec colname="c4" /> + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>index</structfield></entry> + <entry></entry> + <entry>IN: Index of the given frame size in the enumeration.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>pixel_format</structfield></entry> + <entry></entry> + <entry>IN: Pixel format for which the frame sizes are enumerated.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>type</structfield></entry> + <entry></entry> + <entry>OUT: Frame size type the device supports.</entry> + </row> + <row> + <entry>union</entry> + <entry></entry> + <entry></entry> + <entry>OUT: Frame size with the given index.</entry> + </row> + <row> + <entry></entry> + <entry>&v4l2-frmsize-discrete;</entry> + <entry><structfield>discrete</structfield></entry> + <entry></entry> + </row> + <row> + <entry></entry> + <entry>&v4l2-frmsize-stepwise;</entry> + <entry><structfield>stepwise</structfield></entry> + <entry></entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved[2]</structfield></entry> + <entry></entry> + <entry>Reserved space for future use.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + <title>Enums</title> + + <table pgwide="1" frame="none" id="v4l2-frmsizetypes"> + <title>enum <structname>v4l2_frmsizetypes</structname></title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_FRMSIZE_TYPE_DISCRETE</constant></entry> + <entry>1</entry> + <entry>Discrete frame size.</entry> + </row> + <row> + <entry><constant>V4L2_FRMSIZE_TYPE_CONTINUOUS</constant></entry> + <entry>2</entry> + <entry>Continuous frame size.</entry> + </row> + <row> + <entry><constant>V4L2_FRMSIZE_TYPE_STEPWISE</constant></entry> + <entry>3</entry> + <entry>Step-wise defined frame size.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-enum-freq-bands.xml b/Documentation/DocBook/media/v4l/vidioc-enum-freq-bands.xml new file mode 100644 index 00000000000..4e8ea65f728 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-enum-freq-bands.xml @@ -0,0 +1,181 @@ +<refentry id="vidioc-enum-freq-bands"> + <refmeta> + <refentrytitle>ioctl VIDIOC_ENUM_FREQ_BANDS</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_ENUM_FREQ_BANDS</refname> + <refpurpose>Enumerate supported frequency bands</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_frequency_band +*<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_ENUM_FREQ_BANDS</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <note> + <title>Experimental</title> + <para>This is an <link linkend="experimental"> experimental </link> + interface and may change in the future.</para> + </note> + + <para>Enumerates the frequency bands that a tuner or modulator supports. +To do this applications initialize the <structfield>tuner</structfield>, +<structfield>type</structfield> and <structfield>index</structfield> fields, +and zero out the <structfield>reserved</structfield> array of a &v4l2-frequency-band; and +call the <constant>VIDIOC_ENUM_FREQ_BANDS</constant> ioctl with a pointer +to this structure.</para> + + <para>This ioctl is supported if the <constant>V4L2_TUNER_CAP_FREQ_BANDS</constant> capability + of the corresponding tuner/modulator is set.</para> + + <table pgwide="1" frame="none" id="v4l2-frequency-band"> + <title>struct <structname>v4l2_frequency_band</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>tuner</structfield></entry> + <entry>The tuner or modulator index number. This is the +same value as in the &v4l2-input; <structfield>tuner</structfield> +field and the &v4l2-tuner; <structfield>index</structfield> field, or +the &v4l2-output; <structfield>modulator</structfield> field and the +&v4l2-modulator; <structfield>index</structfield> field.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>type</structfield></entry> + <entry>The tuner type. This is the same value as in the +&v4l2-tuner; <structfield>type</structfield> field. The type must be set +to <constant>V4L2_TUNER_RADIO</constant> for <filename>/dev/radioX</filename> +device nodes, and to <constant>V4L2_TUNER_ANALOG_TV</constant> +for all others. Set this field to <constant>V4L2_TUNER_RADIO</constant> for +modulators (currently only radio modulators are supported). +See <xref linkend="v4l2-tuner-type" /></entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>index</structfield></entry> + <entry>Identifies the frequency band, set by the application.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>capability</structfield></entry> + <entry spanname="hspan">The tuner/modulator capability flags for +this frequency band, see <xref linkend="tuner-capability" />. The <constant>V4L2_TUNER_CAP_LOW</constant> +or <constant>V4L2_TUNER_CAP_1HZ</constant> capability must be the same for all frequency bands of the selected tuner/modulator. +So either all bands have that capability set, or none of them have that capability.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>rangelow</structfield></entry> + <entry spanname="hspan">The lowest tunable frequency in +units of 62.5 kHz, or if the <structfield>capability</structfield> +flag <constant>V4L2_TUNER_CAP_LOW</constant> is set, in units of 62.5 +Hz, for this frequency band. A 1 Hz unit is used when the <structfield>capability</structfield> flag +<constant>V4L2_TUNER_CAP_1HZ</constant> is set.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>rangehigh</structfield></entry> + <entry spanname="hspan">The highest tunable frequency in +units of 62.5 kHz, or if the <structfield>capability</structfield> +flag <constant>V4L2_TUNER_CAP_LOW</constant> is set, in units of 62.5 +Hz, for this frequency band. A 1 Hz unit is used when the <structfield>capability</structfield> flag +<constant>V4L2_TUNER_CAP_1HZ</constant> is set.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>modulation</structfield></entry> + <entry spanname="hspan">The supported modulation systems of this frequency band. + See <xref linkend="band-modulation" />. Note that currently only one + modulation system per frequency band is supported. More work will need to + be done if multiple modulation systems are possible. Contact the + linux-media mailing list (&v4l-ml;) if you need that functionality.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[9]</entry> + <entry>Reserved for future extensions. Applications and drivers + must set the array to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="band-modulation"> + <title>Band Modulation Systems</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_BAND_MODULATION_VSB</constant></entry> + <entry>0x02</entry> + <entry>Vestigial Sideband modulation, used for analog TV.</entry> + </row> + <row> + <entry><constant>V4L2_BAND_MODULATION_FM</constant></entry> + <entry>0x04</entry> + <entry>Frequency Modulation, commonly used for analog radio.</entry> + </row> + <row> + <entry><constant>V4L2_BAND_MODULATION_AM</constant></entry> + <entry>0x08</entry> + <entry>Amplitude Modulation, commonly used for analog radio.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The <structfield>tuner</structfield> or <structfield>index</structfield> +is out of bounds or the <structfield>type</structfield> field is wrong.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-enumaudio.xml b/Documentation/DocBook/media/v4l/vidioc-enumaudio.xml new file mode 100644 index 00000000000..ea816ab2e49 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-enumaudio.xml @@ -0,0 +1,76 @@ +<refentry id="vidioc-enumaudio"> + <refmeta> + <refentrytitle>ioctl VIDIOC_ENUMAUDIO</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_ENUMAUDIO</refname> + <refpurpose>Enumerate audio inputs</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_audio *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_ENUMAUDIO</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>To query the attributes of an audio input applications +initialize the <structfield>index</structfield> field and zero out the +<structfield>reserved</structfield> array of a &v4l2-audio; +and call the <constant>VIDIOC_ENUMAUDIO</constant> ioctl with a pointer +to this structure. Drivers fill the rest of the structure or return an +&EINVAL; when the index is out of bounds. To enumerate all audio +inputs applications shall begin at index zero, incrementing by one +until the driver returns <errorcode>EINVAL</errorcode>.</para> + + <para>See <xref linkend="vidioc-g-audio" /> for a description of +&v4l2-audio;.</para> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The number of the audio input is out of bounds.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-enumaudioout.xml b/Documentation/DocBook/media/v4l/vidioc-enumaudioout.xml new file mode 100644 index 00000000000..2e87cedb0d3 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-enumaudioout.xml @@ -0,0 +1,79 @@ +<refentry id="vidioc-enumaudioout"> + <refmeta> + <refentrytitle>ioctl VIDIOC_ENUMAUDOUT</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_ENUMAUDOUT</refname> + <refpurpose>Enumerate audio outputs</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_audioout *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_ENUMAUDOUT</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>To query the attributes of an audio output applications +initialize the <structfield>index</structfield> field and zero out the +<structfield>reserved</structfield> array of a &v4l2-audioout; and +call the <constant>VIDIOC_G_AUDOUT</constant> ioctl with a pointer +to this structure. Drivers fill the rest of the structure or return an +&EINVAL; when the index is out of bounds. To enumerate all audio +outputs applications shall begin at index zero, incrementing by one +until the driver returns <errorcode>EINVAL</errorcode>.</para> + + <para>Note connectors on a TV card to loop back the received audio +signal to a sound card are not audio outputs in this sense.</para> + + <para>See <xref linkend="vidioc-g-audioout" /> for a description of +&v4l2-audioout;.</para> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The number of the audio output is out of bounds.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-enuminput.xml b/Documentation/DocBook/media/v4l/vidioc-enuminput.xml new file mode 100644 index 00000000000..493a39a8ef2 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-enuminput.xml @@ -0,0 +1,308 @@ +<refentry id="vidioc-enuminput"> + <refmeta> + <refentrytitle>ioctl VIDIOC_ENUMINPUT</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_ENUMINPUT</refname> + <refpurpose>Enumerate video inputs</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_input +*<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_ENUMINPUT</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>To query the attributes of a video input applications +initialize the <structfield>index</structfield> field of &v4l2-input; +and call the <constant>VIDIOC_ENUMINPUT</constant> ioctl with a +pointer to this structure. Drivers fill the rest of the structure or +return an &EINVAL; when the index is out of bounds. To enumerate all +inputs applications shall begin at index zero, incrementing by one +until the driver returns <errorcode>EINVAL</errorcode>.</para> + + <table frame="none" pgwide="1" id="v4l2-input"> + <title>struct <structname>v4l2_input</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>index</structfield></entry> + <entry>Identifies the input, set by the +application.</entry> + </row> + <row> + <entry>__u8</entry> + <entry><structfield>name</structfield>[32]</entry> + <entry>Name of the video input, a NUL-terminated ASCII +string, for example: "Vin (Composite 2)". This information is intended +for the user, preferably the connector label on the device itself.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>type</structfield></entry> + <entry>Type of the input, see <xref + linkend="input-type" />.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>audioset</structfield></entry> + <entry><para>Drivers can enumerate up to 32 video and +audio inputs. This field shows which audio inputs were selectable as +audio source if this was the currently selected video input. It is a +bit mask. The LSB corresponds to audio input 0, the MSB to input 31. +Any number of bits can be set, or none.</para><para>When the driver +does not enumerate audio inputs no bits must be set. Applications +shall not interpret this as lack of audio support. Some drivers +automatically select audio sources and do not enumerate them since +there is no choice anyway.</para><para>For details on audio inputs and +how to select the current input see <xref + linkend="audio" />.</para></entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>tuner</structfield></entry> + <entry>Capture devices can have zero or more tuners (RF +demodulators). When the <structfield>type</structfield> is set to +<constant>V4L2_INPUT_TYPE_TUNER</constant> this is an RF connector and +this field identifies the tuner. It corresponds to +&v4l2-tuner; field <structfield>index</structfield>. For details on +tuners see <xref linkend="tuner" />.</entry> + </row> + <row> + <entry>&v4l2-std-id;</entry> + <entry><structfield>std</structfield></entry> + <entry>Every video input supports one or more different +video standards. This field is a set of all supported standards. For +details on video standards and how to switch see <xref +linkend="standard" />.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>status</structfield></entry> + <entry>This field provides status information about the +input. See <xref linkend="input-status" /> for flags. +With the exception of the sensor orientation bits <structfield>status</structfield> is only valid when this is the +current input.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>capabilities</structfield></entry> + <entry>This field provides capabilities for the +input. See <xref linkend="input-capabilities" /> for flags.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[3]</entry> + <entry>Reserved for future extensions. Drivers must set +the array to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table frame="none" pgwide="1" id="input-type"> + <title>Input Types</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_INPUT_TYPE_TUNER</constant></entry> + <entry>1</entry> + <entry>This input uses a tuner (RF demodulator).</entry> + </row> + <row> + <entry><constant>V4L2_INPUT_TYPE_CAMERA</constant></entry> + <entry>2</entry> + <entry>Analog baseband input, for example CVBS / +Composite Video, S-Video, RGB.</entry> + </row> + </tbody> + </tgroup> + </table> + + <!-- Status flags based on proposal by Mark McClelland, +video4linux-list@redhat.com on 18 Oct 2002, subject "Re: [V4L] Re: +v4l2 api". "Why are some of them inverted? So that the driver doesn't +have to lie about the status in cases where it can't tell one way or +the other. Plus, a status of zero would generally mean that everything +is OK." --> + + <table frame="none" pgwide="1" id="input-status"> + <title>Input Status Flags</title> + <tgroup cols="3"> + <colspec colname="c1" /> + <colspec colname="c2" align="center" /> + <colspec colname="c3" /> + <spanspec namest="c1" nameend="c3" spanname="hspan" + align="left" /> + <tbody valign="top"> + <row> + <entry spanname="hspan">General</entry> + </row> + <row> + <entry><constant>V4L2_IN_ST_NO_POWER</constant></entry> + <entry>0x00000001</entry> + <entry>Attached device is off.</entry> + </row> + <row> + <entry><constant>V4L2_IN_ST_NO_SIGNAL</constant></entry> + <entry>0x00000002</entry> + <entry></entry> + </row> + <row> + <entry><constant>V4L2_IN_ST_NO_COLOR</constant></entry> + <entry>0x00000004</entry> + <entry>The hardware supports color decoding, but does not +detect color modulation in the signal.</entry> + </row> + <row> + <entry spanname="hspan">Sensor Orientation</entry> + </row> + <row> + <entry><constant>V4L2_IN_ST_HFLIP</constant></entry> + <entry>0x00000010</entry> + <entry>The input is connected to a device that produces a signal +that is flipped horizontally and does not correct this before passing the +signal to userspace.</entry> + </row> + <row> + <entry><constant>V4L2_IN_ST_VFLIP</constant></entry> + <entry>0x00000020</entry> + <entry>The input is connected to a device that produces a signal +that is flipped vertically and does not correct this before passing the +signal to userspace. Note that a 180 degree rotation is the same as HFLIP | VFLIP</entry> + </row> + <row> + <entry spanname="hspan">Analog Video</entry> + </row> + <row> + <entry><constant>V4L2_IN_ST_NO_H_LOCK</constant></entry> + <entry>0x00000100</entry> + <entry>No horizontal sync lock.</entry> + </row> + <row> + <entry><constant>V4L2_IN_ST_COLOR_KILL</constant></entry> + <entry>0x00000200</entry> + <entry>A color killer circuit automatically disables color +decoding when it detects no color modulation. When this flag is set +the color killer is enabled <emphasis>and</emphasis> has shut off +color decoding.</entry> + </row> + <row> + <entry spanname="hspan">Digital Video</entry> + </row> + <row> + <entry><constant>V4L2_IN_ST_NO_SYNC</constant></entry> + <entry>0x00010000</entry> + <entry>No synchronization lock.</entry> + </row> + <row> + <entry><constant>V4L2_IN_ST_NO_EQU</constant></entry> + <entry>0x00020000</entry> + <entry>No equalizer lock.</entry> + </row> + <row> + <entry><constant>V4L2_IN_ST_NO_CARRIER</constant></entry> + <entry>0x00040000</entry> + <entry>Carrier recovery failed.</entry> + </row> + <row> + <entry spanname="hspan">VCR and Set-Top Box</entry> + </row> + <row> + <entry><constant>V4L2_IN_ST_MACROVISION</constant></entry> + <entry>0x01000000</entry> + <entry>Macrovision is an analog copy prevention system +mangling the video signal to confuse video recorders. When this +flag is set Macrovision has been detected.</entry> + </row> + <row> + <entry><constant>V4L2_IN_ST_NO_ACCESS</constant></entry> + <entry>0x02000000</entry> + <entry>Conditional access denied.</entry> + </row> + <row> + <entry><constant>V4L2_IN_ST_VTR</constant></entry> + <entry>0x04000000</entry> + <entry>VTR time constant. [?]</entry> + </row> + </tbody> + </tgroup> + </table> + + <!-- Capability flags based on video timings RFC by Muralidharan +Karicheri, titled RFC (v1.2): V4L - Support for video timings at the +input/output interface to linux-media@vger.kernel.org on 19 Oct 2009. + --> + <table frame="none" pgwide="1" id="input-capabilities"> + <title>Input capabilities</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_IN_CAP_DV_TIMINGS</constant></entry> + <entry>0x00000002</entry> + <entry>This input supports setting video timings by using VIDIOC_S_DV_TIMINGS.</entry> + </row> + <row> + <entry><constant>V4L2_IN_CAP_STD</constant></entry> + <entry>0x00000004</entry> + <entry>This input supports setting the TV standard by using VIDIOC_S_STD.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The &v4l2-input; <structfield>index</structfield> is +out of bounds.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-enumoutput.xml b/Documentation/DocBook/media/v4l/vidioc-enumoutput.xml new file mode 100644 index 00000000000..2654e097df3 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-enumoutput.xml @@ -0,0 +1,193 @@ +<refentry id="vidioc-enumoutput"> + <refmeta> + <refentrytitle>ioctl VIDIOC_ENUMOUTPUT</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_ENUMOUTPUT</refname> + <refpurpose>Enumerate video outputs</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_output *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_ENUMOUTPUT</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>To query the attributes of a video outputs applications +initialize the <structfield>index</structfield> field of &v4l2-output; +and call the <constant>VIDIOC_ENUMOUTPUT</constant> ioctl with a +pointer to this structure. Drivers fill the rest of the structure or +return an &EINVAL; when the index is out of bounds. To enumerate all +outputs applications shall begin at index zero, incrementing by one +until the driver returns <errorcode>EINVAL</errorcode>.</para> + + <table frame="none" pgwide="1" id="v4l2-output"> + <title>struct <structname>v4l2_output</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>index</structfield></entry> + <entry>Identifies the output, set by the +application.</entry> + </row> + <row> + <entry>__u8</entry> + <entry><structfield>name</structfield>[32]</entry> + <entry>Name of the video output, a NUL-terminated ASCII +string, for example: "Vout". This information is intended for the +user, preferably the connector label on the device itself.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>type</structfield></entry> + <entry>Type of the output, see <xref + linkend="output-type" />.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>audioset</structfield></entry> + <entry><para>Drivers can enumerate up to 32 video and +audio outputs. This field shows which audio outputs were +selectable as the current output if this was the currently selected +video output. It is a bit mask. The LSB corresponds to audio output 0, +the MSB to output 31. Any number of bits can be set, or +none.</para><para>When the driver does not enumerate audio outputs no +bits must be set. Applications shall not interpret this as lack of +audio support. Drivers may automatically select audio outputs without +enumerating them.</para><para>For details on audio outputs and how to +select the current output see <xref linkend="audio" />.</para></entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>modulator</structfield></entry> + <entry>Output devices can have zero or more RF modulators. +When the <structfield>type</structfield> is +<constant>V4L2_OUTPUT_TYPE_MODULATOR</constant> this is an RF +connector and this field identifies the modulator. It corresponds to +&v4l2-modulator; field <structfield>index</structfield>. For details +on modulators see <xref linkend="tuner" />.</entry> + </row> + <row> + <entry>&v4l2-std-id;</entry> + <entry><structfield>std</structfield></entry> + <entry>Every video output supports one or more different +video standards. This field is a set of all supported standards. For +details on video standards and how to switch see <xref + linkend="standard" />.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>capabilities</structfield></entry> + <entry>This field provides capabilities for the +output. See <xref linkend="output-capabilities" /> for flags.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[3]</entry> + <entry>Reserved for future extensions. Drivers must set +the array to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table frame="none" pgwide="1" id="output-type"> + <title>Output Type</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_OUTPUT_TYPE_MODULATOR</constant></entry> + <entry>1</entry> + <entry>This output is an analog TV modulator.</entry> + </row> + <row> + <entry><constant>V4L2_OUTPUT_TYPE_ANALOG</constant></entry> + <entry>2</entry> + <entry>Analog baseband output, for example Composite / +CVBS, S-Video, RGB.</entry> + </row> + <row> + <entry><constant>V4L2_OUTPUT_TYPE_ANALOGVGAOVERLAY</constant></entry> + <entry>3</entry> + <entry>[?]</entry> + </row> + </tbody> + </tgroup> + </table> + + <!-- Capabilities flags based on video timings RFC by Muralidharan +Karicheri, titled RFC (v1.2): V4L - Support for video timings at the +input/output interface to linux-media@vger.kernel.org on 19 Oct 2009. + --> + <table frame="none" pgwide="1" id="output-capabilities"> + <title>Output capabilities</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_OUT_CAP_DV_TIMINGS</constant></entry> + <entry>0x00000002</entry> + <entry>This output supports setting video timings by using VIDIOC_S_DV_TIMINGS.</entry> + </row> + <row> + <entry><constant>V4L2_OUT_CAP_STD</constant></entry> + <entry>0x00000004</entry> + <entry>This output supports setting the TV standard by using VIDIOC_S_STD.</entry> + </row> + </tbody> + </tgroup> + </table> + + </refsect1> + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The &v4l2-output; <structfield>index</structfield> +is out of bounds.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-enumstd.xml b/Documentation/DocBook/media/v4l/vidioc-enumstd.xml new file mode 100644 index 00000000000..8065099401d --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-enumstd.xml @@ -0,0 +1,389 @@ +<refentry id="vidioc-enumstd"> + <refmeta> + <refentrytitle>ioctl VIDIOC_ENUMSTD</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_ENUMSTD</refname> + <refpurpose>Enumerate supported video standards</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_standard *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_ENUMSTD</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>To query the attributes of a video standard, +especially a custom (driver defined) one, applications initialize the +<structfield>index</structfield> field of &v4l2-standard; and call the +<constant>VIDIOC_ENUMSTD</constant> ioctl with a pointer to this +structure. Drivers fill the rest of the structure or return an +&EINVAL; when the index is out of bounds. To enumerate all standards +applications shall begin at index zero, incrementing by one until the +driver returns <errorcode>EINVAL</errorcode>. Drivers may enumerate a +different set of standards after switching the video input or +output.<footnote> + <para>The supported standards may overlap and we need an +unambiguous set to find the current standard returned by +<constant>VIDIOC_G_STD</constant>.</para> + </footnote></para> + + <table pgwide="1" frame="none" id="v4l2-standard"> + <title>struct <structname>v4l2_standard</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>index</structfield></entry> + <entry>Number of the video standard, set by the +application.</entry> + </row> + <row> + <entry>&v4l2-std-id;</entry> + <entry><structfield>id</structfield></entry> + <entry>The bits in this field identify the standard as +one of the common standards listed in <xref linkend="v4l2-std-id" />, +or if bits 32 to 63 are set as custom standards. Multiple bits can be +set if the hardware does not distinguish between these standards, +however separate indices do not indicate the opposite. The +<structfield>id</structfield> must be unique. No other enumerated +<structname>v4l2_standard</structname> structure, for this input or +output anyway, can contain the same set of bits.</entry> + </row> + <row> + <entry>__u8</entry> + <entry><structfield>name</structfield>[24]</entry> + <entry>Name of the standard, a NUL-terminated ASCII +string, for example: "PAL-B/G", "NTSC Japan". This information is +intended for the user.</entry> + </row> + <row> + <entry>&v4l2-fract;</entry> + <entry><structfield>frameperiod</structfield></entry> + <entry>The frame period (not field period) is numerator +/ denominator. For example M/NTSC has a frame period of 1001 / +30000 seconds.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>framelines</structfield></entry> + <entry>Total lines per frame including blanking, +e. g. 625 for B/PAL.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[4]</entry> + <entry>Reserved for future extensions. Drivers must set +the array to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="v4l2-fract"> + <title>struct <structname>v4l2_fract</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>numerator</structfield></entry> + <entry></entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>denominator</structfield></entry> + <entry></entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="v4l2-std-id"> + <title>typedef <structname>v4l2_std_id</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u64</entry> + <entry><structfield>v4l2_std_id</structfield></entry> + <entry>This type is a set, each bit representing another +video standard as listed below and in <xref +linkend="video-standards" />. The 32 most significant bits are reserved +for custom (driver defined) video standards.</entry> + </row> + </tbody> + </tgroup> + </table> + + <para><programlisting> +#define V4L2_STD_PAL_B ((v4l2_std_id)0x00000001) +#define V4L2_STD_PAL_B1 ((v4l2_std_id)0x00000002) +#define V4L2_STD_PAL_G ((v4l2_std_id)0x00000004) +#define V4L2_STD_PAL_H ((v4l2_std_id)0x00000008) +#define V4L2_STD_PAL_I ((v4l2_std_id)0x00000010) +#define V4L2_STD_PAL_D ((v4l2_std_id)0x00000020) +#define V4L2_STD_PAL_D1 ((v4l2_std_id)0x00000040) +#define V4L2_STD_PAL_K ((v4l2_std_id)0x00000080) + +#define V4L2_STD_PAL_M ((v4l2_std_id)0x00000100) +#define V4L2_STD_PAL_N ((v4l2_std_id)0x00000200) +#define V4L2_STD_PAL_Nc ((v4l2_std_id)0x00000400) +#define V4L2_STD_PAL_60 ((v4l2_std_id)0x00000800) +</programlisting></para><para><constant>V4L2_STD_PAL_60</constant> is +a hybrid standard with 525 lines, 60 Hz refresh rate, and PAL color +modulation with a 4.43 MHz color subcarrier. Some PAL video recorders +can play back NTSC tapes in this mode for display on a 50/60 Hz agnostic +PAL TV.</para><para><programlisting> +#define V4L2_STD_NTSC_M ((v4l2_std_id)0x00001000) +#define V4L2_STD_NTSC_M_JP ((v4l2_std_id)0x00002000) +#define V4L2_STD_NTSC_443 ((v4l2_std_id)0x00004000) +</programlisting></para><para><constant>V4L2_STD_NTSC_443</constant> +is a hybrid standard with 525 lines, 60 Hz refresh rate, and NTSC +color modulation with a 4.43 MHz color +subcarrier.</para><para><programlisting> +#define V4L2_STD_NTSC_M_KR ((v4l2_std_id)0x00008000) + +#define V4L2_STD_SECAM_B ((v4l2_std_id)0x00010000) +#define V4L2_STD_SECAM_D ((v4l2_std_id)0x00020000) +#define V4L2_STD_SECAM_G ((v4l2_std_id)0x00040000) +#define V4L2_STD_SECAM_H ((v4l2_std_id)0x00080000) +#define V4L2_STD_SECAM_K ((v4l2_std_id)0x00100000) +#define V4L2_STD_SECAM_K1 ((v4l2_std_id)0x00200000) +#define V4L2_STD_SECAM_L ((v4l2_std_id)0x00400000) +#define V4L2_STD_SECAM_LC ((v4l2_std_id)0x00800000) + +/* ATSC/HDTV */ +#define V4L2_STD_ATSC_8_VSB ((v4l2_std_id)0x01000000) +#define V4L2_STD_ATSC_16_VSB ((v4l2_std_id)0x02000000) +</programlisting></para><para><!-- ATSC proposal by Mark McClelland, +video4linux-list@redhat.com on 17 Oct 2002 +--><constant>V4L2_STD_ATSC_8_VSB</constant> and +<constant>V4L2_STD_ATSC_16_VSB</constant> are U.S. terrestrial digital +TV standards. Presently the V4L2 API does not support digital TV. See +also the Linux DVB API at <ulink +url="http://linuxtv.org">http://linuxtv.org</ulink>.</para> +<para><programlisting> +#define V4L2_STD_PAL_BG (V4L2_STD_PAL_B |\ + V4L2_STD_PAL_B1 |\ + V4L2_STD_PAL_G) +#define V4L2_STD_B (V4L2_STD_PAL_B |\ + V4L2_STD_PAL_B1 |\ + V4L2_STD_SECAM_B) +#define V4L2_STD_GH (V4L2_STD_PAL_G |\ + V4L2_STD_PAL_H |\ + V4L2_STD_SECAM_G |\ + V4L2_STD_SECAM_H) +#define V4L2_STD_PAL_DK (V4L2_STD_PAL_D |\ + V4L2_STD_PAL_D1 |\ + V4L2_STD_PAL_K) +#define V4L2_STD_PAL (V4L2_STD_PAL_BG |\ + V4L2_STD_PAL_DK |\ + V4L2_STD_PAL_H |\ + V4L2_STD_PAL_I) +#define V4L2_STD_NTSC (V4L2_STD_NTSC_M |\ + V4L2_STD_NTSC_M_JP |\ + V4L2_STD_NTSC_M_KR) +#define V4L2_STD_MN (V4L2_STD_PAL_M |\ + V4L2_STD_PAL_N |\ + V4L2_STD_PAL_Nc |\ + V4L2_STD_NTSC) +#define V4L2_STD_SECAM_DK (V4L2_STD_SECAM_D |\ + V4L2_STD_SECAM_K |\ + V4L2_STD_SECAM_K1) +#define V4L2_STD_DK (V4L2_STD_PAL_DK |\ + V4L2_STD_SECAM_DK) + +#define V4L2_STD_SECAM (V4L2_STD_SECAM_B |\ + V4L2_STD_SECAM_G |\ + V4L2_STD_SECAM_H |\ + V4L2_STD_SECAM_DK |\ + V4L2_STD_SECAM_L |\ + V4L2_STD_SECAM_LC) + +#define V4L2_STD_525_60 (V4L2_STD_PAL_M |\ + V4L2_STD_PAL_60 |\ + V4L2_STD_NTSC |\ + V4L2_STD_NTSC_443) +#define V4L2_STD_625_50 (V4L2_STD_PAL |\ + V4L2_STD_PAL_N |\ + V4L2_STD_PAL_Nc |\ + V4L2_STD_SECAM) + +#define V4L2_STD_UNKNOWN 0 +#define V4L2_STD_ALL (V4L2_STD_525_60 |\ + V4L2_STD_625_50) +</programlisting></para> + + <table pgwide="1" id="video-standards" orient="land"> + <title>Video Standards (based on [<xref linkend="itu470" />])</title> + <tgroup cols="12" colsep="1" rowsep="1" align="center"> + <colspec colname="c1" align="left" /> + <colspec colname="c2" /> + <colspec colname="c3" /> + <colspec colname="c4" /> + <colspec colname="c5" /> + <colspec colnum="7" colname="c7" /> + <colspec colnum="9" colname="c9" /> + <colspec colnum="12" colname="c12" /> + <spanspec namest="c2" nameend="c3" spanname="m" align="center" /> + <spanspec namest="c4" nameend="c12" spanname="x" align="center" /> + <spanspec namest="c5" nameend="c7" spanname="b" align="center" /> + <spanspec namest="c9" nameend="c12" spanname="s" align="center" /> + <thead> + <row> + <entry>Characteristics</entry> + <entry><para>M/NTSC<footnote><para>Japan uses a standard +similar to M/NTSC +(V4L2_STD_NTSC_M_JP).</para></footnote></para></entry> + <entry>M/PAL</entry> + <entry><para>N/PAL<footnote><para> The values in +brackets apply to the combination N/PAL a.k.a. +N<subscript>C</subscript> used in Argentina +(V4L2_STD_PAL_Nc).</para></footnote></para></entry> + <entry align="center">B, B1, G/PAL</entry> + <entry align="center">D, D1, K/PAL</entry> + <entry align="center">H/PAL</entry> + <entry align="center">I/PAL</entry> + <entry align="center">B, G/SECAM</entry> + <entry align="center">D, K/SECAM</entry> + <entry align="center">K1/SECAM</entry> + <entry align="center">L/SECAM</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry>Frame lines</entry> + <entry spanname="m">525</entry> + <entry spanname="x">625</entry> + </row> + <row> + <entry>Frame period (s)</entry> + <entry spanname="m">1001/30000</entry> + <entry spanname="x">1/25</entry> + </row> + <row> + <entry>Chrominance sub-carrier frequency (Hz)</entry> + <entry>3579545 ± 10</entry> + <entry>3579611.49 ± 10</entry> + <entry>4433618.75 ± 5 (3582056.25 +± 5)</entry> + <entry spanname="b">4433618.75 ± 5</entry> + <entry>4433618.75 ± 1</entry> + <entry spanname="s">f<subscript>OR</subscript> = +4406250 ± 2000, f<subscript>OB</subscript> = 4250000 +± 2000</entry> + </row> + <row> + <entry>Nominal radio-frequency channel bandwidth +(MHz)</entry> + <entry>6</entry> + <entry>6</entry> + <entry>6</entry> + <entry>B: 7; B1, G: 8</entry> + <entry>8</entry> + <entry>8</entry> + <entry>8</entry> + <entry>8</entry> + <entry>8</entry> + <entry>8</entry> + <entry>8</entry> + </row> + <row> + <entry>Sound carrier relative to vision carrier +(MHz)</entry> + <entry>+ 4.5</entry> + <entry>+ 4.5</entry> + <entry>+ 4.5</entry> + <entry><para>+ 5.5 ± 0.001 +<footnote><para>In the Federal Republic of Germany, Austria, Italy, +the Netherlands, Slovakia and Switzerland a system of two sound +carriers is used, the frequency of the second carrier being +242.1875 kHz above the frequency of the first sound carrier. For +stereophonic sound transmissions a similar system is used in +Australia.</para></footnote> <footnote><para>New Zealand uses a sound +carrier displaced 5.4996 ± 0.0005 MHz from the vision +carrier.</para></footnote> <footnote><para>In Denmark, Finland, New +Zealand, Sweden and Spain a system of two sound carriers is used. In +Iceland, Norway and Poland the same system is being introduced. The +second carrier is 5.85 MHz above the vision carrier and is DQPSK +modulated with 728 kbit/s sound and data multiplex. (NICAM +system)</para></footnote> <footnote><para>In the United Kingdom, a +system of two sound carriers is used. The second sound carrier is +6.552 MHz above the vision carrier and is DQPSK modulated with a +728 kbit/s sound and data multiplex able to carry two sound +channels. (NICAM system)</para></footnote></para></entry> + <entry>+ 6.5 ± 0.001</entry> + <entry>+ 5.5</entry> + <entry>+ 5.9996 ± 0.0005</entry> + <entry>+ 5.5 ± 0.001</entry> + <entry>+ 6.5 ± 0.001</entry> + <entry>+ 6.5</entry> + <entry><para>+ 6.5 <footnote><para>In France, a +digital carrier 5.85 MHz away from the vision carrier may be used in +addition to the main sound carrier. It is modulated in differentially +encoded QPSK with a 728 kbit/s sound and data multiplexer capable of +carrying two sound channels. (NICAM +system)</para></footnote></para></entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The &v4l2-standard; <structfield>index</structfield> +is out of bounds.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>ENODATA</errorcode></term> + <listitem> + <para>Standard video timings are not supported for this input or output.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-expbuf.xml b/Documentation/DocBook/media/v4l/vidioc-expbuf.xml new file mode 100644 index 00000000000..4165e7bfa4f --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-expbuf.xml @@ -0,0 +1,210 @@ +<refentry id="vidioc-expbuf"> + + <refmeta> + <refentrytitle>ioctl VIDIOC_EXPBUF</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_EXPBUF</refname> + <refpurpose>Export a buffer as a DMABUF file descriptor.</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_exportbuffer *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_EXPBUF</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <note> + <title>Experimental</title> + <para>This is an <link linkend="experimental"> experimental </link> + interface and may change in the future.</para> + </note> + +<para>This ioctl is an extension to the <link linkend="mmap">memory +mapping</link> I/O method, therefore it is available only for +<constant>V4L2_MEMORY_MMAP</constant> buffers. It can be used to export a +buffer as a DMABUF file at any time after buffers have been allocated with the +&VIDIOC-REQBUFS; ioctl.</para> + +<para> To export a buffer, applications fill &v4l2-exportbuffer;. The +<structfield> type </structfield> field is set to the same buffer type as was +previously used with &v4l2-requestbuffers;<structfield> type </structfield>. +Applications must also set the <structfield> index </structfield> field. Valid +index numbers range from zero to the number of buffers allocated with +&VIDIOC-REQBUFS; (&v4l2-requestbuffers;<structfield> count </structfield>) +minus one. For the multi-planar API, applications set the <structfield> plane +</structfield> field to the index of the plane to be exported. Valid planes +range from zero to the maximal number of valid planes for the currently active +format. For the single-planar API, applications must set <structfield> plane +</structfield> to zero. Additional flags may be posted in the <structfield> +flags </structfield> field. Refer to a manual for open() for details. +Currently only O_CLOEXEC, O_RDONLY, O_WRONLY, and O_RDWR are supported. All +other fields must be set to zero. +In the case of multi-planar API, every plane is exported separately using +multiple <constant> VIDIOC_EXPBUF </constant> calls. </para> + +<para> After calling <constant>VIDIOC_EXPBUF</constant> the <structfield> fd +</structfield> field will be set by a driver. This is a DMABUF file +descriptor. The application may pass it to other DMABUF-aware devices. Refer to +<link linkend="dmabuf">DMABUF importing</link> for details about importing +DMABUF files into V4L2 nodes. It is recommended to close a DMABUF file when it +is no longer used to allow the associated memory to be reclaimed. </para> + </refsect1> + + <refsect1> + <title>Examples</title> + + <example> + <title>Exporting a buffer.</title> + <programlisting> +int buffer_export(int v4lfd, &v4l2-buf-type; bt, int index, int *dmafd) +{ + &v4l2-exportbuffer; expbuf; + + memset(&expbuf, 0, sizeof(expbuf)); + expbuf.type = bt; + expbuf.index = index; + if (ioctl(v4lfd, &VIDIOC-EXPBUF;, &expbuf) == -1) { + perror("VIDIOC_EXPBUF"); + return -1; + } + + *dmafd = expbuf.fd; + + return 0; +} + </programlisting> + </example> + + <example> + <title>Exporting a buffer using the multi-planar API.</title> + <programlisting> +int buffer_export_mp(int v4lfd, &v4l2-buf-type; bt, int index, + int dmafd[], int n_planes) +{ + int i; + + for (i = 0; i < n_planes; ++i) { + &v4l2-exportbuffer; expbuf; + + memset(&expbuf, 0, sizeof(expbuf)); + expbuf.type = bt; + expbuf.index = index; + expbuf.plane = i; + if (ioctl(v4lfd, &VIDIOC-EXPBUF;, &expbuf) == -1) { + perror("VIDIOC_EXPBUF"); + while (i) + close(dmafd[--i]); + return -1; + } + dmafd[i] = expbuf.fd; + } + + return 0; +} + </programlisting> + </example> + + <table pgwide="1" frame="none" id="v4l2-exportbuffer"> + <title>struct <structname>v4l2_exportbuffer</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>type</structfield></entry> + <entry>Type of the buffer, same as &v4l2-format; +<structfield>type</structfield> or &v4l2-requestbuffers; +<structfield>type</structfield>, set by the application. See <xref +linkend="v4l2-buf-type" /></entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>index</structfield></entry> + <entry>Number of the buffer, set by the application. This field is +only used for <link linkend="mmap">memory mapping</link> I/O and can range from +zero to the number of buffers allocated with the &VIDIOC-REQBUFS; and/or +&VIDIOC-CREATE-BUFS; ioctls. </entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>plane</structfield></entry> + <entry>Index of the plane to be exported when using the +multi-planar API. Otherwise this value must be set to zero. </entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>flags</structfield></entry> + <entry>Flags for the newly created file, currently only <constant> +O_CLOEXEC </constant>, <constant>O_RDONLY</constant>, <constant>O_WRONLY +</constant>, and <constant>O_RDWR</constant> are supported, refer to the manual +of open() for more details.</entry> + </row> + <row> + <entry>__s32</entry> + <entry><structfield>fd</structfield></entry> + <entry>The DMABUF file descriptor associated with a buffer. Set by + the driver.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved[11]</structfield></entry> + <entry>Reserved field for future use. Must be set to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + + </refsect1> + + <refsect1> + &return-value; + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>A queue is not in MMAP mode or DMABUF exporting is not +supported or <structfield> flags </structfield> or <structfield> type +</structfield> or <structfield> index </structfield> or <structfield> plane +</structfield> fields are invalid.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-g-audio.xml b/Documentation/DocBook/media/v4l/vidioc-g-audio.xml new file mode 100644 index 00000000000..d7bb9b3738f --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-g-audio.xml @@ -0,0 +1,172 @@ +<refentry id="vidioc-g-audio"> + <refmeta> + <refentrytitle>ioctl VIDIOC_G_AUDIO, VIDIOC_S_AUDIO</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_G_AUDIO</refname> + <refname>VIDIOC_S_AUDIO</refname> + <refpurpose>Query or select the current audio input and its +attributes</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_audio *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>const struct v4l2_audio *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_G_AUDIO, VIDIOC_S_AUDIO</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>To query the current audio input applications zero out the +<structfield>reserved</structfield> array of a &v4l2-audio; +and call the <constant>VIDIOC_G_AUDIO</constant> ioctl with a pointer +to this structure. Drivers fill the rest of the structure or return an +&EINVAL; when the device has no audio inputs, or none which combine +with the current video input.</para> + + <para>Audio inputs have one writable property, the audio mode. To +select the current audio input <emphasis>and</emphasis> change the +audio mode, applications initialize the +<structfield>index</structfield> and <structfield>mode</structfield> +fields, and the +<structfield>reserved</structfield> array of a +<structname>v4l2_audio</structname> structure and call the +<constant>VIDIOC_S_AUDIO</constant> ioctl. Drivers may switch to a +different audio mode if the request cannot be satisfied. However, this +is a write-only ioctl, it does not return the actual new audio +mode.</para> + + <table pgwide="1" frame="none" id="v4l2-audio"> + <title>struct <structname>v4l2_audio</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>index</structfield></entry> + <entry>Identifies the audio input, set by the +driver or application.</entry> + </row> + <row> + <entry>__u8</entry> + <entry><structfield>name</structfield>[32]</entry> + <entry>Name of the audio input, a NUL-terminated ASCII +string, for example: "Line In". This information is intended for the +user, preferably the connector label on the device itself.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>capability</structfield></entry> + <entry>Audio capability flags, see <xref + linkend="audio-capability" />.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>mode</structfield></entry> + <entry>Audio mode flags set by drivers and applications (on + <constant>VIDIOC_S_AUDIO</constant> ioctl), see <xref linkend="audio-mode" />.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[2]</entry> + <entry>Reserved for future extensions. Drivers and +applications must set the array to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="audio-capability"> + <title>Audio Capability Flags</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_AUDCAP_STEREO</constant></entry> + <entry>0x00001</entry> + <entry>This is a stereo input. The flag is intended to +automatically disable stereo recording etc. when the signal is always +monaural. The API provides no means to detect if stereo is +<emphasis>received</emphasis>, unless the audio input belongs to a +tuner.</entry> + </row> + <row> + <entry><constant>V4L2_AUDCAP_AVL</constant></entry> + <entry>0x00002</entry> + <entry>Automatic Volume Level mode is supported.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="audio-mode"> + <title>Audio Mode Flags</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_AUDMODE_AVL</constant></entry> + <entry>0x00001</entry> + <entry>AVL mode is on.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>No audio inputs combine with the current video input, +or the number of the selected audio input is out of bounds or it does +not combine.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-g-audioout.xml b/Documentation/DocBook/media/v4l/vidioc-g-audioout.xml new file mode 100644 index 00000000000..200a2704a97 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-g-audioout.xml @@ -0,0 +1,138 @@ +<refentry id="vidioc-g-audioout"> + <refmeta> + <refentrytitle>ioctl VIDIOC_G_AUDOUT, VIDIOC_S_AUDOUT</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_G_AUDOUT</refname> + <refname>VIDIOC_S_AUDOUT</refname> + <refpurpose>Query or select the current audio output</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_audioout *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>const struct v4l2_audioout *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_G_AUDOUT, VIDIOC_S_AUDOUT</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>To query the current audio output applications zero out the +<structfield>reserved</structfield> array of a &v4l2-audioout; and +call the <constant>VIDIOC_G_AUDOUT</constant> ioctl with a pointer +to this structure. Drivers fill the rest of the structure or return an +&EINVAL; when the device has no audio inputs, or none which combine +with the current video output.</para> + + <para>Audio outputs have no writable properties. Nevertheless, to +select the current audio output applications can initialize the +<structfield>index</structfield> field and +<structfield>reserved</structfield> array (which in the future may +contain writable properties) of a +<structname>v4l2_audioout</structname> structure and call the +<constant>VIDIOC_S_AUDOUT</constant> ioctl. Drivers switch to the +requested output or return the &EINVAL; when the index is out of +bounds. This is a write-only ioctl, it does not return the current +audio output attributes as <constant>VIDIOC_G_AUDOUT</constant> +does.</para> + + <para>Note connectors on a TV card to loop back the received audio +signal to a sound card are not audio outputs in this sense.</para> + + <table pgwide="1" frame="none" id="v4l2-audioout"> + <title>struct <structname>v4l2_audioout</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>index</structfield></entry> + <entry>Identifies the audio output, set by the +driver or application.</entry> + </row> + <row> + <entry>__u8</entry> + <entry><structfield>name</structfield>[32]</entry> + <entry>Name of the audio output, a NUL-terminated ASCII +string, for example: "Line Out". This information is intended for the +user, preferably the connector label on the device itself.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>capability</structfield></entry> + <entry>Audio capability flags, none defined yet. Drivers +must set this field to zero.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>mode</structfield></entry> + <entry>Audio mode, none defined yet. Drivers and +applications (on <constant>VIDIOC_S_AUDOUT</constant>) must set this +field to zero.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[2]</entry> + <entry>Reserved for future extensions. Drivers and +applications must set the array to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>No audio outputs combine with the current video +output, or the number of the selected audio output is out of bounds or +it does not combine.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-g-crop.xml b/Documentation/DocBook/media/v4l/vidioc-g-crop.xml new file mode 100644 index 00000000000..75c6a93de3c --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-g-crop.xml @@ -0,0 +1,124 @@ +<refentry id="vidioc-g-crop"> + <refmeta> + <refentrytitle>ioctl VIDIOC_G_CROP, VIDIOC_S_CROP</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_G_CROP</refname> + <refname>VIDIOC_S_CROP</refname> + <refpurpose>Get or set the current cropping rectangle</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_crop *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>const struct v4l2_crop *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_G_CROP, VIDIOC_S_CROP</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>To query the cropping rectangle size and position +applications set the <structfield>type</structfield> field of a +<structname>v4l2_crop</structname> structure to the respective buffer +(stream) type and call the <constant>VIDIOC_G_CROP</constant> ioctl +with a pointer to this structure. The driver fills the rest of the +structure or returns the &EINVAL; if cropping is not supported.</para> + + <para>To change the cropping rectangle applications initialize the +<structfield>type</structfield> and &v4l2-rect; substructure named +<structfield>c</structfield> of a v4l2_crop structure and call the +<constant>VIDIOC_S_CROP</constant> ioctl with a pointer to this +structure.</para> + + <para>The driver first adjusts the requested dimensions against +hardware limits, &ie; the bounds given by the capture/output window, +and it rounds to the closest possible values of horizontal and +vertical offset, width and height. In particular the driver must round +the vertical offset of the cropping rectangle to frame lines modulo +two, such that the field order cannot be confused.</para> + + <para>Second the driver adjusts the image size (the opposite +rectangle of the scaling process, source or target depending on the +data direction) to the closest size possible while maintaining the +current horizontal and vertical scaling factor.</para> + + <para>Finally the driver programs the hardware with the actual +cropping and image parameters. <constant>VIDIOC_S_CROP</constant> is a +write-only ioctl, it does not return the actual parameters. To query +them applications must call <constant>VIDIOC_G_CROP</constant> and +&VIDIOC-G-FMT;. When the parameters are unsuitable the application may +modify the cropping or image parameters and repeat the cycle until +satisfactory parameters have been negotiated.</para> + + <para>When cropping is not supported then no parameters are +changed and <constant>VIDIOC_S_CROP</constant> returns the +&EINVAL;.</para> + + <table pgwide="1" frame="none" id="v4l2-crop"> + <title>struct <structname>v4l2_crop</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>type</structfield></entry> + <entry>Type of the data stream, set by the application. +Only these types are valid here: <constant>V4L2_BUF_TYPE_VIDEO_CAPTURE</constant>, +<constant>V4L2_BUF_TYPE_VIDEO_OUTPUT</constant> and +<constant>V4L2_BUF_TYPE_VIDEO_OVERLAY</constant>. See <xref linkend="v4l2-buf-type" />.</entry> + </row> + <row> + <entry>&v4l2-rect;</entry> + <entry><structfield>c</structfield></entry> + <entry>Cropping rectangle. The same co-ordinate system as +for &v4l2-cropcap; <structfield>bounds</structfield> is used.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-g-ctrl.xml b/Documentation/DocBook/media/v4l/vidioc-g-ctrl.xml new file mode 100644 index 00000000000..ee2820d6ca6 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-g-ctrl.xml @@ -0,0 +1,133 @@ +<refentry id="vidioc-g-ctrl"> + <refmeta> + <refentrytitle>ioctl VIDIOC_G_CTRL, VIDIOC_S_CTRL</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_G_CTRL</refname> + <refname>VIDIOC_S_CTRL</refname> + <refpurpose>Get or set the value of a control</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_control +*<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_G_CTRL, VIDIOC_S_CTRL</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>To get the current value of a control applications +initialize the <structfield>id</structfield> field of a struct +<structname>v4l2_control</structname> and call the +<constant>VIDIOC_G_CTRL</constant> ioctl with a pointer to this +structure. To change the value of a control applications initialize +the <structfield>id</structfield> and <structfield>value</structfield> +fields of a struct <structname>v4l2_control</structname> and call the +<constant>VIDIOC_S_CTRL</constant> ioctl.</para> + + <para>When the <structfield>id</structfield> is invalid drivers +return an &EINVAL;. When the <structfield>value</structfield> is out +of bounds drivers can choose to take the closest valid value or return +an &ERANGE;, whatever seems more appropriate. However, +<constant>VIDIOC_S_CTRL</constant> is a write-only ioctl, it does not +return the actual new value. If the <structfield>value</structfield> +is inappropriate for the control (e.g. if it refers to an unsupported +menu index of a menu control), then &EINVAL; is returned as well.</para> + + <para>These ioctls work only with user controls. For other +control classes the &VIDIOC-G-EXT-CTRLS;, &VIDIOC-S-EXT-CTRLS; or +&VIDIOC-TRY-EXT-CTRLS; must be used.</para> + + <table pgwide="1" frame="none" id="v4l2-control"> + <title>struct <structname>v4l2_control</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>id</structfield></entry> + <entry>Identifies the control, set by the +application.</entry> + </row> + <row> + <entry>__s32</entry> + <entry><structfield>value</structfield></entry> + <entry>New value or current value.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The &v4l2-control; <structfield>id</structfield> is +invalid or the <structfield>value</structfield> is inappropriate for +the given control (i.e. if a menu item is selected that is not supported +by the driver according to &VIDIOC-QUERYMENU;).</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>ERANGE</errorcode></term> + <listitem> + <para>The &v4l2-control; <structfield>value</structfield> +is out of bounds.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EBUSY</errorcode></term> + <listitem> + <para>The control is temporarily not changeable, possibly +because another applications took over control of the device function +this control belongs to.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EACCES</errorcode></term> + <listitem> + <para>Attempt to set a read-only control or to get a + write-only control.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-g-dv-timings.xml b/Documentation/DocBook/media/v4l/vidioc-g-dv-timings.xml new file mode 100644 index 00000000000..c4336577ff0 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-g-dv-timings.xml @@ -0,0 +1,331 @@ +<refentry id="vidioc-g-dv-timings"> + <refmeta> + <refentrytitle>ioctl VIDIOC_G_DV_TIMINGS, VIDIOC_S_DV_TIMINGS</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_G_DV_TIMINGS</refname> + <refname>VIDIOC_S_DV_TIMINGS</refname> + <refpurpose>Get or set DV timings for input or output</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_dv_timings *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_G_DV_TIMINGS, VIDIOC_S_DV_TIMINGS</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + <para>To set DV timings for the input or output, applications use the +<constant>VIDIOC_S_DV_TIMINGS</constant> ioctl and to get the current timings, +applications use the <constant>VIDIOC_G_DV_TIMINGS</constant> ioctl. The detailed timing +information is filled in using the structure &v4l2-dv-timings;. These ioctls take +a pointer to the &v4l2-dv-timings; structure as argument. If the ioctl is not supported +or the timing values are not correct, the driver returns &EINVAL;.</para> +<para>The <filename>linux/v4l2-dv-timings.h</filename> header can be used to get the +timings of the formats in the <xref linkend="cea861" /> and <xref linkend="vesadmt" /> +standards. If the current input or output does not support DV timings (e.g. if +&VIDIOC-ENUMINPUT; does not set the <constant>V4L2_IN_CAP_DV_TIMINGS</constant> flag), then +&ENODATA; is returned.</para> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>This ioctl is not supported, or the +<constant>VIDIOC_S_DV_TIMINGS</constant> parameter was unsuitable.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>ENODATA</errorcode></term> + <listitem> + <para>Digital video timings are not supported for this input or output.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EBUSY</errorcode></term> + <listitem> + <para>The device is busy and therefore can not change the timings.</para> + </listitem> + </varlistentry> + </variablelist> + + <table pgwide="1" frame="none" id="v4l2-bt-timings"> + <title>struct <structname>v4l2_bt_timings</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>width</structfield></entry> + <entry>Width of the active video in pixels.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>height</structfield></entry> + <entry>Height of the active video frame in lines. So for interlaced formats the + height of the active video in each field is <structfield>height</structfield>/2.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>interlaced</structfield></entry> + <entry>Progressive (0) or interlaced (1)</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>polarities</structfield></entry> + <entry>This is a bit mask that defines polarities of sync signals. +bit 0 (V4L2_DV_VSYNC_POS_POL) is for vertical sync polarity and bit 1 (V4L2_DV_HSYNC_POS_POL) is for horizontal sync polarity. If the bit is set +(1) it is positive polarity and if is cleared (0), it is negative polarity.</entry> + </row> + <row> + <entry>__u64</entry> + <entry><structfield>pixelclock</structfield></entry> + <entry>Pixel clock in Hz. Ex. 74.25MHz->74250000</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>hfrontporch</structfield></entry> + <entry>Horizontal front porch in pixels</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>hsync</structfield></entry> + <entry>Horizontal sync length in pixels</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>hbackporch</structfield></entry> + <entry>Horizontal back porch in pixels</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>vfrontporch</structfield></entry> + <entry>Vertical front porch in lines. For interlaced formats this refers to the + odd field (aka field 1).</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>vsync</structfield></entry> + <entry>Vertical sync length in lines. For interlaced formats this refers to the + odd field (aka field 1).</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>vbackporch</structfield></entry> + <entry>Vertical back porch in lines. For interlaced formats this refers to the + odd field (aka field 1).</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>il_vfrontporch</structfield></entry> + <entry>Vertical front porch in lines for the even field (aka field 2) of + interlaced field formats. Must be 0 for progressive formats.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>il_vsync</structfield></entry> + <entry>Vertical sync length in lines for the even field (aka field 2) of + interlaced field formats. Must be 0 for progressive formats.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>il_vbackporch</structfield></entry> + <entry>Vertical back porch in lines for the even field (aka field 2) of + interlaced field formats. Must be 0 for progressive formats.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>standards</structfield></entry> + <entry>The video standard(s) this format belongs to. This will be filled in by + the driver. Applications must set this to 0. See <xref linkend="dv-bt-standards"/> + for a list of standards.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>flags</structfield></entry> + <entry>Several flags giving more information about the format. + See <xref linkend="dv-bt-flags"/> for a description of the flags. + </entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="v4l2-dv-timings"> + <title>struct <structname>v4l2_dv_timings</structname></title> + <tgroup cols="4"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>type</structfield></entry> + <entry></entry> + <entry>Type of DV timings as listed in <xref linkend="dv-timing-types"/>.</entry> + </row> + <row> + <entry>union</entry> + <entry><structfield></structfield></entry> + <entry></entry> + </row> + <row> + <entry></entry> + <entry>&v4l2-bt-timings;</entry> + <entry><structfield>bt</structfield></entry> + <entry>Timings defined by BT.656/1120 specifications</entry> + </row> + <row> + <entry></entry> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[32]</entry> + <entry></entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="dv-timing-types"> + <title>DV Timing types</title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>Timing type</entry> + <entry>value</entry> + <entry>Description</entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + </row> + <row> + <entry>V4L2_DV_BT_656_1120</entry> + <entry>0</entry> + <entry>BT.656/1120 timings</entry> + </row> + </tbody> + </tgroup> + </table> + <table pgwide="1" frame="none" id="dv-bt-standards"> + <title>DV BT Timing standards</title> + <tgroup cols="2"> + &cs-str; + <tbody valign="top"> + <row> + <entry>Timing standard</entry> + <entry>Description</entry> + </row> + <row> + <entry></entry> + <entry></entry> + </row> + <row> + <entry>V4L2_DV_BT_STD_CEA861</entry> + <entry>The timings follow the CEA-861 Digital TV Profile standard</entry> + </row> + <row> + <entry>V4L2_DV_BT_STD_DMT</entry> + <entry>The timings follow the VESA Discrete Monitor Timings standard</entry> + </row> + <row> + <entry>V4L2_DV_BT_STD_CVT</entry> + <entry>The timings follow the VESA Coordinated Video Timings standard</entry> + </row> + <row> + <entry>V4L2_DV_BT_STD_GTF</entry> + <entry>The timings follow the VESA Generalized Timings Formula standard</entry> + </row> + </tbody> + </tgroup> + </table> + <table pgwide="1" frame="none" id="dv-bt-flags"> + <title>DV BT Timing flags</title> + <tgroup cols="2"> + &cs-str; + <tbody valign="top"> + <row> + <entry>Flag</entry> + <entry>Description</entry> + </row> + <row> + <entry></entry> + <entry></entry> + </row> + <row> + <entry>V4L2_DV_FL_REDUCED_BLANKING</entry> + <entry>CVT/GTF specific: the timings use reduced blanking (CVT) or the 'Secondary +GTF' curve (GTF). In both cases the horizontal and/or vertical blanking +intervals are reduced, allowing a higher resolution over the same +bandwidth. This is a read-only flag, applications must not set this. + </entry> + </row> + <row> + <entry>V4L2_DV_FL_CAN_REDUCE_FPS</entry> + <entry>CEA-861 specific: set for CEA-861 formats with a framerate that is a multiple +of six. These formats can be optionally played at 1 / 1.001 speed to +be compatible with 60 Hz based standards such as NTSC and PAL-M that use a framerate of +29.97 frames per second. If the transmitter can't generate such frequencies, then the +flag will also be cleared. This is a read-only flag, applications must not set this. + </entry> + </row> + <row> + <entry>V4L2_DV_FL_REDUCED_FPS</entry> + <entry>CEA-861 specific: only valid for video transmitters, the flag is cleared +by receivers. It is also only valid for formats with the V4L2_DV_FL_CAN_REDUCE_FPS flag +set, for other formats the flag will be cleared by the driver. + +If the application sets this flag, then the pixelclock used to set up the transmitter is +divided by 1.001 to make it compatible with NTSC framerates. If the transmitter +can't generate such frequencies, then the flag will also be cleared. + </entry> + </row> + <row> + <entry>V4L2_DV_FL_HALF_LINE</entry> + <entry>Specific to interlaced formats: if set, then field 1 (aka the odd field) +is really one half-line longer and field 2 (aka the even field) is really one half-line +shorter, so each field has exactly the same number of half-lines. Whether half-lines can be +detected or used depends on the hardware. + </entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-g-edid.xml b/Documentation/DocBook/media/v4l/vidioc-g-edid.xml new file mode 100644 index 00000000000..ce4563b8713 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-g-edid.xml @@ -0,0 +1,162 @@ +<refentry id="vidioc-g-edid"> + <refmeta> + <refentrytitle>ioctl VIDIOC_G_EDID, VIDIOC_S_EDID</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_G_EDID</refname> + <refname>VIDIOC_S_EDID</refname> + <refpurpose>Get or set the EDID of a video receiver/transmitter</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_edid *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>const struct v4l2_edid *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_G_EDID, VIDIOC_S_EDID</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + <para>These ioctls can be used to get or set an EDID associated with an input + from a receiver or an output of a transmitter device. They can be + used with subdevice nodes (/dev/v4l-subdevX) or with video nodes (/dev/videoX).</para> + + <para>When used with video nodes the <structfield>pad</structfield> field represents the + input (for video capture devices) or output (for video output devices) index as + is returned by &VIDIOC-ENUMINPUT; and &VIDIOC-ENUMOUTPUT; respectively. When used + with subdevice nodes the <structfield>pad</structfield> field represents the + input or output pad of the subdevice. If there is no EDID support for the given + <structfield>pad</structfield> value, then the &EINVAL; will be returned.</para> + + <para>To get the EDID data the application has to fill in the <structfield>pad</structfield>, + <structfield>start_block</structfield>, <structfield>blocks</structfield> and <structfield>edid</structfield> + fields and call <constant>VIDIOC_G_EDID</constant>. The current EDID from block + <structfield>start_block</structfield> and of size <structfield>blocks</structfield> + will be placed in the memory <structfield>edid</structfield> points to. The <structfield>edid</structfield> + pointer must point to memory at least <structfield>blocks</structfield> * 128 bytes + large (the size of one block is 128 bytes).</para> + + <para>If there are fewer blocks than specified, then the driver will set <structfield>blocks</structfield> + to the actual number of blocks. If there are no EDID blocks available at all, then the error code + ENODATA is set.</para> + + <para>If blocks have to be retrieved from the sink, then this call will block until they + have been read.</para> + + <para>To set the EDID blocks of a receiver the application has to fill in the <structfield>pad</structfield>, + <structfield>blocks</structfield> and <structfield>edid</structfield> fields and set + <structfield>start_block</structfield> to 0. It is not possible to set part of an EDID, + it is always all or nothing. Setting the EDID data is only valid for receivers as it makes + no sense for a transmitter.</para> + + <para>The driver assumes that the full EDID is passed in. If there are more EDID blocks than + the hardware can handle then the EDID is not written, but instead the error code E2BIG is set + and <structfield>blocks</structfield> is set to the maximum that the hardware supports. + If <structfield>start_block</structfield> is any + value other than 0 then the error code EINVAL is set.</para> + + <para>To disable an EDID you set <structfield>blocks</structfield> to 0. Depending on the + hardware this will drive the hotplug pin low and/or block the source from reading the EDID + data in some way. In any case, the end result is the same: the EDID is no longer available. + </para> + + <table pgwide="1" frame="none" id="v4l2-edid"> + <title>struct <structname>v4l2_edid</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>pad</structfield></entry> + <entry>Pad for which to get/set the EDID blocks. When used with a video device + node the pad represents the input or output index as returned by + &VIDIOC-ENUMINPUT; and &VIDIOC-ENUMOUTPUT; respectively.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>start_block</structfield></entry> + <entry>Read the EDID from starting with this block. Must be 0 when setting + the EDID.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>blocks</structfield></entry> + <entry>The number of blocks to get or set. Must be less or equal to 256 (the + maximum number of blocks as defined by the standard). When you set the EDID and + <structfield>blocks</structfield> is 0, then the EDID is disabled or erased.</entry> + </row> + <row> + <entry>__u8 *</entry> + <entry><structfield>edid</structfield></entry> + <entry>Pointer to memory that contains the EDID. The minimum size is + <structfield>blocks</structfield> * 128.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[5]</entry> + <entry>Reserved for future extensions. Applications and drivers must + set the array to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>ENODATA</errorcode></term> + <listitem> + <para>The EDID data is not available.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>E2BIG</errorcode></term> + <listitem> + <para>The EDID data you provided is more than the hardware can handle.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-g-enc-index.xml b/Documentation/DocBook/media/v4l/vidioc-g-enc-index.xml new file mode 100644 index 00000000000..be25029a16f --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-g-enc-index.xml @@ -0,0 +1,189 @@ +<refentry id="vidioc-g-enc-index"> + <refmeta> + <refentrytitle>ioctl VIDIOC_G_ENC_INDEX</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_G_ENC_INDEX</refname> + <refpurpose>Get meta data about a compressed video stream</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_enc_idx *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_G_ENC_INDEX</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>The <constant>VIDIOC_G_ENC_INDEX</constant> ioctl provides +meta data about a compressed video stream the same or another +application currently reads from the driver, which is useful for +random access into the stream without decoding it.</para> + + <para>To read the data applications must call +<constant>VIDIOC_G_ENC_INDEX</constant> with a pointer to a +&v4l2-enc-idx;. On success the driver fills the +<structfield>entry</structfield> array, stores the number of elements +written in the <structfield>entries</structfield> field, and +initializes the <structfield>entries_cap</structfield> field.</para> + + <para>Each element of the <structfield>entry</structfield> array +contains meta data about one picture. A +<constant>VIDIOC_G_ENC_INDEX</constant> call reads up to +<constant>V4L2_ENC_IDX_ENTRIES</constant> entries from a driver +buffer, which can hold up to <structfield>entries_cap</structfield> +entries. This number can be lower or higher than +<constant>V4L2_ENC_IDX_ENTRIES</constant>, but not zero. When the +application fails to read the meta data in time the oldest entries +will be lost. When the buffer is empty or no capturing/encoding is in +progress, <structfield>entries</structfield> will be zero.</para> + + <para>Currently this ioctl is only defined for MPEG-2 program +streams and video elementary streams.</para> + + <table pgwide="1" frame="none" id="v4l2-enc-idx"> + <title>struct <structname>v4l2_enc_idx</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>entries</structfield></entry> + <entry>The number of entries the driver stored in the +<structfield>entry</structfield> array.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>entries_cap</structfield></entry> + <entry>The number of entries the driver can +buffer. Must be greater than zero.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[4]</entry> + <entry spanname="hspan">Reserved for future extensions. +Drivers must set the array to zero.</entry> + </row> + <row> + <entry>&v4l2-enc-idx-entry;</entry> + <entry><structfield>entry</structfield>[<constant>V4L2_ENC_IDX_ENTRIES</constant>]</entry> + <entry>Meta data about a compressed video stream. Each +element of the array corresponds to one picture, sorted in ascending +order by their <structfield>offset</structfield>.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="v4l2-enc-idx-entry"> + <title>struct <structname>v4l2_enc_idx_entry</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u64</entry> + <entry><structfield>offset</structfield></entry> + <entry>The offset in bytes from the beginning of the +compressed video stream to the beginning of this picture, that is a +<wordasword>PES packet header</wordasword> as defined in <xref + linkend="mpeg2part1" /> or a <wordasword>picture +header</wordasword> as defined in <xref linkend="mpeg2part2" />. When +the encoder is stopped, the driver resets the offset to zero.</entry> + </row> + <row> + <entry>__u64</entry> + <entry><structfield>pts</structfield></entry> + <entry>The 33 bit <wordasword>Presentation Time +Stamp</wordasword> of this picture as defined in <xref + linkend="mpeg2part1" />.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>length</structfield></entry> + <entry>The length of this picture in bytes.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>flags</structfield></entry> + <entry>Flags containing the coding type of this picture, see <xref + linkend="enc-idx-flags" />.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[2]</entry> + <entry>Reserved for future extensions. +Drivers must set the array to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="enc-idx-flags"> + <title>Index Entry Flags</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_ENC_IDX_FRAME_I</constant></entry> + <entry>0x00</entry> + <entry>This is an Intra-coded picture.</entry> + </row> + <row> + <entry><constant>V4L2_ENC_IDX_FRAME_P</constant></entry> + <entry>0x01</entry> + <entry>This is a Predictive-coded picture.</entry> + </row> + <row> + <entry><constant>V4L2_ENC_IDX_FRAME_B</constant></entry> + <entry>0x02</entry> + <entry>This is a Bidirectionally predictive-coded +picture.</entry> + </row> + <row> + <entry><constant>V4L2_ENC_IDX_FRAME_MASK</constant></entry> + <entry>0x0F</entry> + <entry><wordasword>AND</wordasword> the flags field with +this mask to obtain the picture coding type.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-g-ext-ctrls.xml b/Documentation/DocBook/media/v4l/vidioc-g-ext-ctrls.xml new file mode 100644 index 00000000000..e9f6735c082 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-g-ext-ctrls.xml @@ -0,0 +1,392 @@ +<refentry id="vidioc-g-ext-ctrls"> + <refmeta> + <refentrytitle>ioctl VIDIOC_G_EXT_CTRLS, VIDIOC_S_EXT_CTRLS, +VIDIOC_TRY_EXT_CTRLS</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_G_EXT_CTRLS</refname> + <refname>VIDIOC_S_EXT_CTRLS</refname> + <refname>VIDIOC_TRY_EXT_CTRLS</refname> + <refpurpose>Get or set the value of several controls, try control +values</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_ext_controls +*<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_G_EXT_CTRLS, VIDIOC_S_EXT_CTRLS, +VIDIOC_TRY_EXT_CTRLS</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>These ioctls allow the caller to get or set multiple +controls atomically. Control IDs are grouped into control classes (see +<xref linkend="ctrl-class" />) and all controls in the control array +must belong to the same control class.</para> + + <para>Applications must always fill in the +<structfield>count</structfield>, +<structfield>ctrl_class</structfield>, +<structfield>controls</structfield> and +<structfield>reserved</structfield> fields of &v4l2-ext-controls;, and +initialize the &v4l2-ext-control; array pointed to by the +<structfield>controls</structfield> fields.</para> + + <para>To get the current value of a set of controls applications +initialize the <structfield>id</structfield>, +<structfield>size</structfield> and <structfield>reserved2</structfield> fields +of each &v4l2-ext-control; and call the +<constant>VIDIOC_G_EXT_CTRLS</constant> ioctl. String controls controls +must also set the <structfield>string</structfield> field.</para> + + <para>If the <structfield>size</structfield> is too small to +receive the control result (only relevant for pointer-type controls +like strings), then the driver will set <structfield>size</structfield> +to a valid value and return an &ENOSPC;. You should re-allocate the +string memory to this new size and try again. It is possible that the +same issue occurs again if the string has grown in the meantime. It is +recommended to call &VIDIOC-QUERYCTRL; first and use +<structfield>maximum</structfield>+1 as the new <structfield>size</structfield> +value. It is guaranteed that that is sufficient memory. +</para> + + <para>To change the value of a set of controls applications +initialize the <structfield>id</structfield>, <structfield>size</structfield>, +<structfield>reserved2</structfield> and +<structfield>value/string</structfield> fields of each &v4l2-ext-control; and +call the <constant>VIDIOC_S_EXT_CTRLS</constant> ioctl. The controls +will only be set if <emphasis>all</emphasis> control values are +valid.</para> + + <para>To check if a set of controls have correct values applications +initialize the <structfield>id</structfield>, <structfield>size</structfield>, +<structfield>reserved2</structfield> and +<structfield>value/string</structfield> fields of each &v4l2-ext-control; and +call the <constant>VIDIOC_TRY_EXT_CTRLS</constant> ioctl. It is up to +the driver whether wrong values are automatically adjusted to a valid +value or if an error is returned.</para> + + <para>When the <structfield>id</structfield> or +<structfield>ctrl_class</structfield> is invalid drivers return an +&EINVAL;. When the value is out of bounds drivers can choose to take +the closest valid value or return an &ERANGE;, whatever seems more +appropriate. In the first case the new value is set in +&v4l2-ext-control;. If the new control value is inappropriate (e.g. the +given menu index is not supported by the menu control), then this will +also result in an &EINVAL; error.</para> + + <para>The driver will only set/get these controls if all control +values are correct. This prevents the situation where only some of the +controls were set/get. Only low-level errors (⪚ a failed i2c +command) can still cause this situation.</para> + + <table pgwide="1" frame="none" id="v4l2-ext-control"> + <title>struct <structname>v4l2_ext_control</structname></title> + <tgroup cols="4"> + &cs-ustr; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>id</structfield></entry> + <entry></entry> + <entry>Identifies the control, set by the +application.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>size</structfield></entry> + <entry></entry> + <entry>The total size in bytes of the payload of this +control. This is normally 0, but for pointer controls this should be +set to the size of the memory containing the payload, or that will +receive the payload. If <constant>VIDIOC_G_EXT_CTRLS</constant> finds +that this value is less than is required to store +the payload result, then it is set to a value large enough to store the +payload result and ENOSPC is returned. Note that for string controls +this <structfield>size</structfield> field should not be confused with the length of the string. +This field refers to the size of the memory that contains the string. +The actual <emphasis>length</emphasis> of the string may well be much smaller. +</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved2</structfield>[1]</entry> + <entry></entry> + <entry>Reserved for future extensions. Drivers and +applications must set the array to zero.</entry> + </row> + <row> + <entry>union</entry> + <entry>(anonymous)</entry> + </row> + <row> + <entry></entry> + <entry>__s32</entry> + <entry><structfield>value</structfield></entry> + <entry>New value or current value.</entry> + </row> + <row> + <entry></entry> + <entry>__s64</entry> + <entry><structfield>value64</structfield></entry> + <entry>New value or current value.</entry> + </row> + <row> + <entry></entry> + <entry>char *</entry> + <entry><structfield>string</structfield></entry> + <entry>A pointer to a string.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="v4l2-ext-controls"> + <title>struct <structname>v4l2_ext_controls</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>ctrl_class</structfield></entry> + <entry>The control class to which all controls belong, see +<xref linkend="ctrl-class" />. Drivers that use a kernel framework for handling +controls will also accept a value of 0 here, meaning that the controls can +belong to any control class. Whether drivers support this can be tested by setting +<structfield>ctrl_class</structfield> to 0 and calling <constant>VIDIOC_TRY_EXT_CTRLS</constant> +with a <structfield>count</structfield> of 0. If that succeeds, then the driver +supports this feature.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>count</structfield></entry> + <entry>The number of controls in the controls array. May +also be zero.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>error_idx</structfield></entry> + <entry><para>Set by the driver in case of an error. If the error is +associated with a particular control, then <structfield>error_idx</structfield> +is set to the index of that control. If the error is not related to a specific +control, or the validation step failed (see below), then +<structfield>error_idx</structfield> is set to <structfield>count</structfield>. +The value is undefined if the ioctl returned 0 (success).</para> + +<para>Before controls are read from/written to hardware a validation step +takes place: this checks if all controls in the list are valid controls, +if no attempt is made to write to a read-only control or read from a write-only +control, and any other up-front checks that can be done without accessing the +hardware. The exact validations done during this step are driver dependent +since some checks might require hardware access for some devices, thus making +it impossible to do those checks up-front. However, drivers should make a +best-effort to do as many up-front checks as possible.</para> + +<para>This check is done to avoid leaving the hardware in an inconsistent state due +to easy-to-avoid problems. But it leads to another problem: the application needs to +know whether an error came from the validation step (meaning that the hardware +was not touched) or from an error during the actual reading from/writing to hardware.</para> + +<para>The, in hindsight quite poor, solution for that is to set <structfield>error_idx</structfield> +to <structfield>count</structfield> if the validation failed. This has the +unfortunate side-effect that it is not possible to see which control failed the +validation. If the validation was successful and the error happened while +accessing the hardware, then <structfield>error_idx</structfield> is less than +<structfield>count</structfield> and only the controls up to +<structfield>error_idx-1</structfield> were read or written correctly, and the +state of the remaining controls is undefined.</para> + +<para>Since <constant>VIDIOC_TRY_EXT_CTRLS</constant> does not access hardware +there is also no need to handle the validation step in this special way, +so <structfield>error_idx</structfield> will just be set to the control that +failed the validation step instead of to <structfield>count</structfield>. +This means that if <constant>VIDIOC_S_EXT_CTRLS</constant> fails with +<structfield>error_idx</structfield> set to <structfield>count</structfield>, +then you can call <constant>VIDIOC_TRY_EXT_CTRLS</constant> to try to discover +the actual control that failed the validation step. Unfortunately, there +is no <constant>TRY</constant> equivalent for <constant>VIDIOC_G_EXT_CTRLS</constant>. +</para></entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[2]</entry> + <entry>Reserved for future extensions. Drivers and +applications must set the array to zero.</entry> + </row> + <row> + <entry>&v4l2-ext-control; *</entry> + <entry><structfield>controls</structfield></entry> + <entry>Pointer to an array of +<structfield>count</structfield> v4l2_ext_control structures. Ignored +if <structfield>count</structfield> equals zero.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="ctrl-class"> + <title>Control classes</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_CTRL_CLASS_USER</constant></entry> + <entry>0x980000</entry> + <entry>The class containing user controls. These controls +are described in <xref linkend="control" />. All controls that can be set +using the &VIDIOC-S-CTRL; and &VIDIOC-G-CTRL; ioctl belong to this +class.</entry> + </row> + <row> + <entry><constant>V4L2_CTRL_CLASS_MPEG</constant></entry> + <entry>0x990000</entry> + <entry>The class containing MPEG compression controls. +These controls are described in <xref + linkend="mpeg-controls" />.</entry> + </row> + <row> + <entry><constant>V4L2_CTRL_CLASS_CAMERA</constant></entry> + <entry>0x9a0000</entry> + <entry>The class containing camera controls. +These controls are described in <xref + linkend="camera-controls" />.</entry> + </row> + <row> + <entry><constant>V4L2_CTRL_CLASS_FM_TX</constant></entry> + <entry>0x9b0000</entry> + <entry>The class containing FM Transmitter (FM TX) controls. +These controls are described in <xref + linkend="fm-tx-controls" />.</entry> + </row> + <row> + <entry><constant>V4L2_CTRL_CLASS_FLASH</constant></entry> + <entry>0x9c0000</entry> + <entry>The class containing flash device controls. +These controls are described in <xref + linkend="flash-controls" />.</entry> + </row> + <row> + <entry><constant>V4L2_CTRL_CLASS_JPEG</constant></entry> + <entry>0x9d0000</entry> + <entry>The class containing JPEG compression controls. +These controls are described in <xref + linkend="jpeg-controls" />.</entry> + </row> + <row> + <entry><constant>V4L2_CTRL_CLASS_IMAGE_SOURCE</constant></entry> + <entry>0x9e0000</entry> <entry>The class containing image + source controls. These controls are described in <xref + linkend="image-source-controls" />.</entry> + </row> + <row> + <entry><constant>V4L2_CTRL_CLASS_IMAGE_PROC</constant></entry> + <entry>0x9f0000</entry> <entry>The class containing image + processing controls. These controls are described in <xref + linkend="image-process-controls" />.</entry> + </row> + + <row> + <entry><constant>V4L2_CTRL_CLASS_FM_RX</constant></entry> + <entry>0xa10000</entry> + <entry>The class containing FM Receiver (FM RX) controls. +These controls are described in <xref + linkend="fm-rx-controls" />.</entry> + </row> + <row> + <entry><constant>V4L2_CTRL_CLASS_RF_TUNER</constant></entry> + <entry>0xa20000</entry> + <entry>The class containing RF tuner controls. +These controls are described in <xref linkend="rf-tuner-controls" />.</entry> + </row> + </tbody> + </tgroup> + </table> + + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The &v4l2-ext-control; <structfield>id</structfield> +is invalid, the &v4l2-ext-controls; +<structfield>ctrl_class</structfield> is invalid, or the &v4l2-ext-control; +<structfield>value</structfield> was inappropriate (e.g. the given menu +index is not supported by the driver). This error code is +also returned by the <constant>VIDIOC_S_EXT_CTRLS</constant> and +<constant>VIDIOC_TRY_EXT_CTRLS</constant> ioctls if two or more +control values are in conflict.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>ERANGE</errorcode></term> + <listitem> + <para>The &v4l2-ext-control; <structfield>value</structfield> +is out of bounds.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EBUSY</errorcode></term> + <listitem> + <para>The control is temporarily not changeable, possibly +because another applications took over control of the device function +this control belongs to.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>ENOSPC</errorcode></term> + <listitem> + <para>The space reserved for the control's payload is insufficient. +The field <structfield>size</structfield> is set to a value that is enough +to store the payload and this error code is returned.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EACCES</errorcode></term> + <listitem> + <para>Attempt to try or set a read-only control or to get a + write-only control.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> + diff --git a/Documentation/DocBook/media/v4l/vidioc-g-fbuf.xml b/Documentation/DocBook/media/v4l/vidioc-g-fbuf.xml new file mode 100644 index 00000000000..7c63815e7af --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-g-fbuf.xml @@ -0,0 +1,463 @@ +<refentry id="vidioc-g-fbuf"> + <refmeta> + <refentrytitle>ioctl VIDIOC_G_FBUF, VIDIOC_S_FBUF</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_G_FBUF</refname> + <refname>VIDIOC_S_FBUF</refname> + <refpurpose>Get or set frame buffer overlay parameters</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_framebuffer *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>const struct v4l2_framebuffer *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_G_FBUF, VIDIOC_S_FBUF</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>Applications can use the <constant>VIDIOC_G_FBUF</constant> and +<constant>VIDIOC_S_FBUF</constant> ioctl to get and set the +framebuffer parameters for a <link linkend="overlay">Video +Overlay</link> or <link linkend="osd">Video Output Overlay</link> +(OSD). The type of overlay is implied by the device type (capture or +output device) and can be determined with the &VIDIOC-QUERYCAP; ioctl. +One <filename>/dev/videoN</filename> device must not support both +kinds of overlay.</para> + + <para>The V4L2 API distinguishes destructive and non-destructive +overlays. A destructive overlay copies captured video images into the +video memory of a graphics card. A non-destructive overlay blends +video images into a VGA signal or graphics into a video signal. +<wordasword>Video Output Overlays</wordasword> are always +non-destructive.</para> + + <para>To get the current parameters applications call the +<constant>VIDIOC_G_FBUF</constant> ioctl with a pointer to a +<structname>v4l2_framebuffer</structname> structure. The driver fills +all fields of the structure or returns an &EINVAL; when overlays are +not supported.</para> + + <para>To set the parameters for a <wordasword>Video Output +Overlay</wordasword>, applications must initialize the +<structfield>flags</structfield> field of a struct +<structname>v4l2_framebuffer</structname>. Since the framebuffer is +implemented on the TV card all other parameters are determined by the +driver. When an application calls <constant>VIDIOC_S_FBUF</constant> +with a pointer to this structure, the driver prepares for the overlay +and returns the framebuffer parameters as +<constant>VIDIOC_G_FBUF</constant> does, or it returns an error +code.</para> + + <para>To set the parameters for a <wordasword>non-destructive +Video Overlay</wordasword>, applications must initialize the +<structfield>flags</structfield> field, the +<structfield>fmt</structfield> substructure, and call +<constant>VIDIOC_S_FBUF</constant>. Again the driver prepares for the +overlay and returns the framebuffer parameters as +<constant>VIDIOC_G_FBUF</constant> does, or it returns an error +code.</para> + + <para>For a <wordasword>destructive Video Overlay</wordasword> +applications must additionally provide a +<structfield>base</structfield> address. Setting up a DMA to a +random memory location can jeopardize the system security, its +stability or even damage the hardware, therefore only the superuser +can set the parameters for a destructive video overlay.</para> + + <!-- NB v4l2_pix_format is also specified in pixfmt.sgml.--> + + <table pgwide="1" frame="none" id="v4l2-framebuffer"> + <title>struct <structname>v4l2_framebuffer</structname></title> + <tgroup cols="4"> + &cs-ustr; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>capability</structfield></entry> + <entry></entry> + <entry>Overlay capability flags set by the driver, see +<xref linkend="framebuffer-cap" />.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>flags</structfield></entry> + <entry></entry> + <entry>Overlay control flags set by application and +driver, see <xref linkend="framebuffer-flags" /></entry> + </row> + <row> + <entry>void *</entry> + <entry><structfield>base</structfield></entry> + <entry></entry> + <entry>Physical base address of the framebuffer, +that is the address of the pixel in the top left corner of the +framebuffer.<footnote><para>A physical base address may not suit all +platforms. GK notes in theory we should pass something like PCI device ++ memory region + offset instead. If you encounter problems please +discuss on the linux-media mailing list: &v4l-ml;.</para></footnote></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + <entry>This field is irrelevant to +<wordasword>non-destructive Video Overlays</wordasword>. For +<wordasword>destructive Video Overlays</wordasword> applications must +provide a base address. The driver may accept only base addresses +which are a multiple of two, four or eight bytes. For +<wordasword>Video Output Overlays</wordasword> the driver must return +a valid base address, so applications can find the corresponding Linux +framebuffer device (see <xref linkend="osd" />).</entry> + </row> + <row> + <entry>&v4l2-pix-format;</entry> + <entry><structfield>fmt</structfield></entry> + <entry></entry> + <entry>Layout of the frame buffer. The +<structname>v4l2_pix_format</structname> structure is defined in <xref +linkend="pixfmt" />, for clarification the fields and acceptable values + are listed below:</entry> + </row> + <row> + <entry></entry> + <entry>__u32</entry> + <entry><structfield>width</structfield></entry> + <entry>Width of the frame buffer in pixels.</entry> + </row> + <row> + <entry></entry> + <entry>__u32</entry> + <entry><structfield>height</structfield></entry> + <entry>Height of the frame buffer in pixels.</entry> + </row> + <row> + <entry></entry> + <entry>__u32</entry> + <entry><structfield>pixelformat</structfield></entry> + <entry>The pixel format of the +framebuffer.</entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + <entry>For <wordasword>non-destructive Video +Overlays</wordasword> this field only defines a format for the +&v4l2-window; <structfield>chromakey</structfield> field.</entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + <entry>For <wordasword>destructive Video +Overlays</wordasword> applications must initialize this field. For +<wordasword>Video Output Overlays</wordasword> the driver must return +a valid format.</entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry></entry> + <entry>Usually this is an RGB format (for example +<link linkend="V4L2-PIX-FMT-RGB565"><constant>V4L2_PIX_FMT_RGB565</constant></link>) +but YUV formats (only packed YUV formats when chroma keying is used, +not including <constant>V4L2_PIX_FMT_YUYV</constant> and +<constant>V4L2_PIX_FMT_UYVY</constant>) and the +<constant>V4L2_PIX_FMT_PAL8</constant> format are also permitted. The +behavior of the driver when an application requests a compressed +format is undefined. See <xref linkend="pixfmt" /> for information on +pixel formats.</entry> + </row> + <row> + <entry></entry> + <entry>&v4l2-field;</entry> + <entry><structfield>field</structfield></entry> + <entry>Drivers and applications shall ignore this field. +If applicable, the field order is selected with the &VIDIOC-S-FMT; +ioctl, using the <structfield>field</structfield> field of +&v4l2-window;.</entry> + </row> + <row> + <entry></entry> + <entry>__u32</entry> + <entry><structfield>bytesperline</structfield></entry> + <entry>Distance in bytes between the leftmost pixels in +two adjacent lines.</entry> + </row> + <row> + <entry spanname="hspan"><para>This field is irrelevant to +<wordasword>non-destructive Video +Overlays</wordasword>.</para><para>For <wordasword>destructive Video +Overlays</wordasword> both applications and drivers can set this field +to request padding bytes at the end of each line. Drivers however may +ignore the requested value, returning <structfield>width</structfield> +times bytes-per-pixel or a larger value required by the hardware. That +implies applications can just set this field to zero to get a +reasonable default.</para><para>For <wordasword>Video Output +Overlays</wordasword> the driver must return a valid +value.</para><para>Video hardware may access padding bytes, therefore +they must reside in accessible memory. Consider for example the case +where padding bytes after the last line of an image cross a system +page boundary. Capture devices may write padding bytes, the value is +undefined. Output devices ignore the contents of padding +bytes.</para><para>When the image format is planar the +<structfield>bytesperline</structfield> value applies to the largest +plane and is divided by the same factor as the +<structfield>width</structfield> field for any smaller planes. For +example the Cb and Cr planes of a YUV 4:2:0 image have half as many +padding bytes following each line as the Y plane. To avoid ambiguities +drivers must return a <structfield>bytesperline</structfield> value +rounded up to a multiple of the scale factor.</para></entry> + </row> + <row> + <entry></entry> + <entry>__u32</entry> + <entry><structfield>sizeimage</structfield></entry> + <entry><para>This field is irrelevant to +<wordasword>non-destructive Video Overlays</wordasword>. For +<wordasword>destructive Video Overlays</wordasword> applications must +initialize this field. For <wordasword>Video Output +Overlays</wordasword> the driver must return a valid +format.</para><para>Together with <structfield>base</structfield> it +defines the framebuffer memory accessible by the +driver.</para></entry> + </row> + <row> + <entry></entry> + <entry>&v4l2-colorspace;</entry> + <entry><structfield>colorspace</structfield></entry> + <entry>This information supplements the +<structfield>pixelformat</structfield> and must be set by the driver, +see <xref linkend="colorspaces" />.</entry> + </row> + <row> + <entry></entry> + <entry>__u32</entry> + <entry><structfield>priv</structfield></entry> + <entry>Reserved for additional information about custom +(driver defined) formats. When not used drivers and applications must +set this field to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="framebuffer-cap"> + <title>Frame Buffer Capability Flags</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_FBUF_CAP_EXTERNOVERLAY</constant></entry> + <entry>0x0001</entry> + <entry>The device is capable of non-destructive overlays. +When the driver clears this flag, only destructive overlays are +supported. There are no drivers yet which support both destructive and +non-destructive overlays. Video Output Overlays are in practice always +non-destructive.</entry> + </row> + <row> + <entry><constant>V4L2_FBUF_CAP_CHROMAKEY</constant></entry> + <entry>0x0002</entry> + <entry>The device supports clipping by chroma-keying the +images. That is, image pixels replace pixels in the VGA or video +signal only where the latter assume a certain color. Chroma-keying +makes no sense for destructive overlays.</entry> + </row> + <row> + <entry><constant>V4L2_FBUF_CAP_LIST_CLIPPING</constant></entry> + <entry>0x0004</entry> + <entry>The device supports clipping using a list of clip +rectangles.</entry> + </row> + <row> + <entry><constant>V4L2_FBUF_CAP_BITMAP_CLIPPING</constant></entry> + <entry>0x0008</entry> + <entry>The device supports clipping using a bit mask.</entry> + </row> + <row> + <entry><constant>V4L2_FBUF_CAP_LOCAL_ALPHA</constant></entry> + <entry>0x0010</entry> + <entry>The device supports clipping/blending using the +alpha channel of the framebuffer or VGA signal. Alpha blending makes +no sense for destructive overlays.</entry> + </row> + <row> + <entry><constant>V4L2_FBUF_CAP_GLOBAL_ALPHA</constant></entry> + <entry>0x0020</entry> + <entry>The device supports alpha blending using a global +alpha value. Alpha blending makes no sense for destructive overlays.</entry> + </row> + <row> + <entry><constant>V4L2_FBUF_CAP_LOCAL_INV_ALPHA</constant></entry> + <entry>0x0040</entry> + <entry>The device supports clipping/blending using the +inverted alpha channel of the framebuffer or VGA signal. Alpha +blending makes no sense for destructive overlays.</entry> + </row> + <row> + <entry><constant>V4L2_FBUF_CAP_SRC_CHROMAKEY</constant></entry> + <entry>0x0080</entry> + <entry>The device supports Source Chroma-keying. Video pixels +with the chroma-key colors are replaced by framebuffer pixels, which is exactly opposite of +<constant>V4L2_FBUF_CAP_CHROMAKEY</constant></entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="framebuffer-flags"> + <title>Frame Buffer Flags</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_FBUF_FLAG_PRIMARY</constant></entry> + <entry>0x0001</entry> + <entry>The framebuffer is the primary graphics surface. +In other words, the overlay is destructive. This flag is typically set by any +driver that doesn't have the <constant>V4L2_FBUF_CAP_EXTERNOVERLAY</constant> +capability and it is cleared otherwise.</entry> + </row> + <row> + <entry><constant>V4L2_FBUF_FLAG_OVERLAY</constant></entry> + <entry>0x0002</entry> + <entry>If this flag is set for a video capture device, then the +driver will set the initial overlay size to cover the full framebuffer size, +otherwise the existing overlay size (as set by &VIDIOC-S-FMT;) will be used. + +Only one video capture driver (bttv) supports this flag. The use of this flag +for capture devices is deprecated. There is no way to detect which drivers +support this flag, so the only reliable method of setting the overlay size is +through &VIDIOC-S-FMT;. + +If this flag is set for a video output device, then the video output overlay +window is relative to the top-left corner of the framebuffer and restricted +to the size of the framebuffer. If it is cleared, then the video output +overlay window is relative to the video output display. + </entry> + </row> + <row> + <entry><constant>V4L2_FBUF_FLAG_CHROMAKEY</constant></entry> + <entry>0x0004</entry> + <entry>Use chroma-keying. The chroma-key color is +determined by the <structfield>chromakey</structfield> field of +&v4l2-window; and negotiated with the &VIDIOC-S-FMT; ioctl, see <xref + linkend="overlay" /> +and + <xref linkend="osd" />.</entry> + </row> + <row> + <entry spanname="hspan">There are no flags to enable +clipping using a list of clip rectangles or a bitmap. These methods +are negotiated with the &VIDIOC-S-FMT; ioctl, see <xref + linkend="overlay" /> and <xref linkend="osd" />.</entry> + </row> + <row> + <entry><constant>V4L2_FBUF_FLAG_LOCAL_ALPHA</constant></entry> + <entry>0x0008</entry> + <entry>Use the alpha channel of the framebuffer to clip or +blend framebuffer pixels with video images. The blend +function is: output = framebuffer pixel * alpha + video pixel * (1 - +alpha). The actual alpha depth depends on the framebuffer pixel +format.</entry> + </row> + <row> + <entry><constant>V4L2_FBUF_FLAG_GLOBAL_ALPHA</constant></entry> + <entry>0x0010</entry> + <entry>Use a global alpha value to blend the framebuffer +with video images. The blend function is: output = (framebuffer pixel +* alpha + video pixel * (255 - alpha)) / 255. The alpha value is +determined by the <structfield>global_alpha</structfield> field of +&v4l2-window; and negotiated with the &VIDIOC-S-FMT; ioctl, see <xref + linkend="overlay" /> +and <xref linkend="osd" />.</entry> + </row> + <row> + <entry><constant>V4L2_FBUF_FLAG_LOCAL_INV_ALPHA</constant></entry> + <entry>0x0020</entry> + <entry>Like +<constant>V4L2_FBUF_FLAG_LOCAL_ALPHA</constant>, use the alpha channel +of the framebuffer to clip or blend framebuffer pixels with video +images, but with an inverted alpha value. The blend function is: +output = framebuffer pixel * (1 - alpha) + video pixel * alpha. The +actual alpha depth depends on the framebuffer pixel format.</entry> + </row> + <row> + <entry><constant>V4L2_FBUF_FLAG_SRC_CHROMAKEY</constant></entry> + <entry>0x0040</entry> + <entry>Use source chroma-keying. The source chroma-key color is +determined by the <structfield>chromakey</structfield> field of +&v4l2-window; and negotiated with the &VIDIOC-S-FMT; ioctl, see <xref +linkend="overlay" /> and <xref linkend="osd" />. +Both chroma-keying are mutual exclusive to each other, so same +<structfield>chromakey</structfield> field of &v4l2-window; is being used.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EPERM</errorcode></term> + <listitem> + <para><constant>VIDIOC_S_FBUF</constant> can only be called +by a privileged user to negotiate the parameters for a destructive +overlay.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The <constant>VIDIOC_S_FBUF</constant> parameters are unsuitable.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-g-fmt.xml b/Documentation/DocBook/media/v4l/vidioc-g-fmt.xml new file mode 100644 index 00000000000..4fe19a7a9a3 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-g-fmt.xml @@ -0,0 +1,204 @@ +<refentry id="vidioc-g-fmt"> + <refmeta> + <refentrytitle>ioctl VIDIOC_G_FMT, VIDIOC_S_FMT, +VIDIOC_TRY_FMT</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_G_FMT</refname> + <refname>VIDIOC_S_FMT</refname> + <refname>VIDIOC_TRY_FMT</refname> + <refpurpose>Get or set the data format, try a format</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_format +*<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_G_FMT, VIDIOC_S_FMT, VIDIOC_TRY_FMT</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>These ioctls are used to negotiate the format of data +(typically image format) exchanged between driver and +application.</para> + + <para>To query the current parameters applications set the +<structfield>type</structfield> field of a struct +<structname>v4l2_format</structname> to the respective buffer (stream) +type. For example video capture devices use +<constant>V4L2_BUF_TYPE_VIDEO_CAPTURE</constant> or +<constant>V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE</constant>. When the application +calls the <constant>VIDIOC_G_FMT</constant> ioctl with a pointer to +this structure the driver fills the respective member of the +<structfield>fmt</structfield> union. In case of video capture devices +that is either the &v4l2-pix-format; <structfield>pix</structfield> or +the &v4l2-pix-format-mplane; <structfield>pix_mp</structfield> member. +When the requested buffer type is not supported drivers return an +&EINVAL;.</para> + + <para>To change the current format parameters applications +initialize the <structfield>type</structfield> field and all +fields of the respective <structfield>fmt</structfield> +union member. For details see the documentation of the various devices +types in <xref linkend="devices" />. Good practice is to query the +current parameters first, and to +modify only those parameters not suitable for the application. When +the application calls the <constant>VIDIOC_S_FMT</constant> ioctl +with a pointer to a <structname>v4l2_format</structname> structure +the driver checks +and adjusts the parameters against hardware abilities. Drivers +should not return an error code unless the <structfield>type</structfield> field is invalid, this is +a mechanism to fathom device capabilities and to approach parameters +acceptable for both the application and driver. On success the driver +may program the hardware, allocate resources and generally prepare for +data exchange. +Finally the <constant>VIDIOC_S_FMT</constant> ioctl returns the +current format parameters as <constant>VIDIOC_G_FMT</constant> does. +Very simple, inflexible devices may even ignore all input and always +return the default parameters. However all V4L2 devices exchanging +data with the application must implement the +<constant>VIDIOC_G_FMT</constant> and +<constant>VIDIOC_S_FMT</constant> ioctl. When the requested buffer +type is not supported drivers return an &EINVAL; on a +<constant>VIDIOC_S_FMT</constant> attempt. When I/O is already in +progress or the resource is not available for other reasons drivers +return the &EBUSY;.</para> + + <para>The <constant>VIDIOC_TRY_FMT</constant> ioctl is equivalent +to <constant>VIDIOC_S_FMT</constant> with one exception: it does not +change driver state. It can also be called at any time, never +returning <errorcode>EBUSY</errorcode>. This function is provided to +negotiate parameters, to learn about hardware limitations, without +disabling I/O or possibly time consuming hardware preparations. +Although strongly recommended drivers are not required to implement +this ioctl.</para> + + <para>The format as returned by <constant>VIDIOC_TRY_FMT</constant> +must be identical to what <constant>VIDIOC_S_FMT</constant> returns for +the same input or output.</para> + + <table pgwide="1" frame="none" id="v4l2-format"> + <title>struct <structname>v4l2_format</structname></title> + <tgroup cols="4"> + <colspec colname="c1" /> + <colspec colname="c2" /> + <colspec colname="c3" /> + <colspec colname="c4" /> + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>type</structfield></entry> + <entry></entry> + <entry>Type of the data stream, see <xref + linkend="v4l2-buf-type" />.</entry> + </row> + <row> + <entry>union</entry> + <entry><structfield>fmt</structfield></entry> + </row> + <row> + <entry></entry> + <entry>&v4l2-pix-format;</entry> + <entry><structfield>pix</structfield></entry> + <entry>Definition of an image format, see <xref + linkend="pixfmt" />, used by video capture and output +devices.</entry> + </row> + <row> + <entry></entry> + <entry>&v4l2-pix-format-mplane;</entry> + <entry><structfield>pix_mp</structfield></entry> + <entry>Definition of an image format, see <xref + linkend="pixfmt" />, used by video capture and output +devices that support the <link linkend="planar-apis">multi-planar +version of the API</link>.</entry> + </row> + <row> + <entry></entry> + <entry>&v4l2-window;</entry> + <entry><structfield>win</structfield></entry> + <entry>Definition of an overlaid image, see <xref + linkend="overlay" />, used by video overlay devices.</entry> + </row> + <row> + <entry></entry> + <entry>&v4l2-vbi-format;</entry> + <entry><structfield>vbi</structfield></entry> + <entry>Raw VBI capture or output parameters. This is +discussed in more detail in <xref linkend="raw-vbi" />. Used by raw VBI +capture and output devices.</entry> + </row> + <row> + <entry></entry> + <entry>&v4l2-sliced-vbi-format;</entry> + <entry><structfield>sliced</structfield></entry> + <entry>Sliced VBI capture or output parameters. See +<xref linkend="sliced" /> for details. Used by sliced VBI +capture and output devices.</entry> + </row> + <row> + <entry></entry> + <entry>&v4l2-sdr-format;</entry> + <entry><structfield>sdr</structfield></entry> + <entry>Definition of a data format, see +<xref linkend="pixfmt" />, used by SDR capture devices.</entry> + </row> + <row> + <entry></entry> + <entry>__u8</entry> + <entry><structfield>raw_data</structfield>[200]</entry> + <entry>Place holder for future extensions.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The &v4l2-format; <structfield>type</structfield> +field is invalid or the requested buffer type not supported.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-g-frequency.xml b/Documentation/DocBook/media/v4l/vidioc-g-frequency.xml new file mode 100644 index 00000000000..d1034fb61d1 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-g-frequency.xml @@ -0,0 +1,148 @@ +<refentry id="vidioc-g-frequency"> + <refmeta> + <refentrytitle>ioctl VIDIOC_G_FREQUENCY, VIDIOC_S_FREQUENCY</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_G_FREQUENCY</refname> + <refname>VIDIOC_S_FREQUENCY</refname> + <refpurpose>Get or set tuner or modulator radio +frequency</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_frequency +*<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>const struct v4l2_frequency +*<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_G_FREQUENCY, VIDIOC_S_FREQUENCY</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>To get the current tuner or modulator radio frequency +applications set the <structfield>tuner</structfield> field of a +&v4l2-frequency; to the respective tuner or modulator number (only +input devices have tuners, only output devices have modulators), zero +out the <structfield>reserved</structfield> array and +call the <constant>VIDIOC_G_FREQUENCY</constant> ioctl with a pointer +to this structure. The driver stores the current frequency in the +<structfield>frequency</structfield> field.</para> + + <para>To change the current tuner or modulator radio frequency +applications initialize the <structfield>tuner</structfield>, +<structfield>type</structfield> and +<structfield>frequency</structfield> fields, and the +<structfield>reserved</structfield> array of a &v4l2-frequency; and +call the <constant>VIDIOC_S_FREQUENCY</constant> ioctl with a pointer +to this structure. When the requested frequency is not possible the +driver assumes the closest possible value. However +<constant>VIDIOC_S_FREQUENCY</constant> is a write-only ioctl, it does +not return the actual new frequency.</para> + + <table pgwide="1" frame="none" id="v4l2-frequency"> + <title>struct <structname>v4l2_frequency</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>tuner</structfield></entry> + <entry>The tuner or modulator index number. This is the +same value as in the &v4l2-input; <structfield>tuner</structfield> +field and the &v4l2-tuner; <structfield>index</structfield> field, or +the &v4l2-output; <structfield>modulator</structfield> field and the +&v4l2-modulator; <structfield>index</structfield> field.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>type</structfield></entry> + <entry>The tuner type. This is the same value as in the +&v4l2-tuner; <structfield>type</structfield> field. The type must be set +to <constant>V4L2_TUNER_RADIO</constant> for <filename>/dev/radioX</filename> +device nodes, and to <constant>V4L2_TUNER_ANALOG_TV</constant> +for all others. Set this field to <constant>V4L2_TUNER_RADIO</constant> for +modulators (currently only radio modulators are supported). +See <xref linkend="v4l2-tuner-type" /></entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>frequency</structfield></entry> + <entry>Tuning frequency in units of 62.5 kHz, or if the +&v4l2-tuner; or &v4l2-modulator; <structfield>capability</structfield> flag +<constant>V4L2_TUNER_CAP_LOW</constant> is set, in units of 62.5 +Hz. A 1 Hz unit is used when the <structfield>capability</structfield> flag +<constant>V4L2_TUNER_CAP_1HZ</constant> is set.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[8]</entry> + <entry>Reserved for future extensions. Drivers and + applications must set the array to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The <structfield>tuner</structfield> index is out of +bounds or the value in the <structfield>type</structfield> field is +wrong.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EBUSY</errorcode></term> + <listitem> + <para>A hardware seek is in progress.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-g-input.xml b/Documentation/DocBook/media/v4l/vidioc-g-input.xml new file mode 100644 index 00000000000..1d43065090d --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-g-input.xml @@ -0,0 +1,83 @@ +<refentry id="vidioc-g-input"> + <refmeta> + <refentrytitle>ioctl VIDIOC_G_INPUT, VIDIOC_S_INPUT</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_G_INPUT</refname> + <refname>VIDIOC_S_INPUT</refname> + <refpurpose>Query or select the current video input</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>int *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_G_INPUT, VIDIOC_S_INPUT</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>To query the current video input applications call the +<constant>VIDIOC_G_INPUT</constant> ioctl with a pointer to an integer +where the driver stores the number of the input, as in the +&v4l2-input; <structfield>index</structfield> field. This ioctl will +fail only when there are no video inputs, returning +<errorcode>EINVAL</errorcode>.</para> + + <para>To select a video input applications store the number of the +desired input in an integer and call the +<constant>VIDIOC_S_INPUT</constant> ioctl with a pointer to this +integer. Side effects are possible. For example inputs may support +different video standards, so the driver may implicitly switch the +current standard. Because of these possible side effects applications +must select an input before querying or negotiating any other parameters.</para> + + <para>Information about video inputs is available using the +&VIDIOC-ENUMINPUT; ioctl.</para> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The number of the video input is out of bounds.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-g-jpegcomp.xml b/Documentation/DocBook/media/v4l/vidioc-g-jpegcomp.xml new file mode 100644 index 00000000000..098ff483802 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-g-jpegcomp.xml @@ -0,0 +1,175 @@ +<refentry id="vidioc-g-jpegcomp"> + <refmeta> + <refentrytitle>ioctl VIDIOC_G_JPEGCOMP, VIDIOC_S_JPEGCOMP</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_G_JPEGCOMP</refname> + <refname>VIDIOC_S_JPEGCOMP</refname> + <refpurpose></refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>v4l2_jpegcompression *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>const v4l2_jpegcompression *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_G_JPEGCOMP, VIDIOC_S_JPEGCOMP</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>These ioctls are <emphasis role="bold">deprecated</emphasis>. + New drivers and applications should use <link linkend="jpeg-controls"> + JPEG class controls</link> for image quality and JPEG markers control. + </para> + + <para>[to do]</para> + + <para>Ronald Bultje elaborates:</para> + + <!-- See video4linux-list@redhat.com on 16 Oct 2002, subject +"Re: [V4L] Re: v4l2 api / Zoran v4l2_jpegcompression" --> + + <para>APP is some application-specific information. The +application can set it itself, and it'll be stored in the JPEG-encoded +fields (eg; interlacing information for in an AVI or so). COM is the +same, but it's comments, like 'encoded by me' or so.</para> + + <para>jpeg_markers describes whether the huffman tables, +quantization tables and the restart interval information (all +JPEG-specific stuff) should be stored in the JPEG-encoded fields. +These define how the JPEG field is encoded. If you omit them, +applications assume you've used standard encoding. You usually do want +to add them.</para> + + <!-- NB VIDIOC_S_JPEGCOMP is w/o. --> + + <table pgwide="1" frame="none" id="v4l2-jpegcompression"> + <title>struct <structname>v4l2_jpegcompression</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>int</entry> + <entry><structfield>quality</structfield></entry> + <entry>Deprecated. If <link linkend="jpeg-quality-control"><constant> + V4L2_CID_JPEG_COMPRESSION_QUALITY</constant></link> control is exposed + by a driver applications should use it instead and ignore this field. + </entry> + </row> + <row> + <entry>int</entry> + <entry><structfield>APPn</structfield></entry> + <entry></entry> + </row> + <row> + <entry>int</entry> + <entry><structfield>APP_len</structfield></entry> + <entry></entry> + </row> + <row> + <entry>char</entry> + <entry><structfield>APP_data</structfield>[60]</entry> + <entry></entry> + </row> + <row> + <entry>int</entry> + <entry><structfield>COM_len</structfield></entry> + <entry></entry> + </row> + <row> + <entry>char</entry> + <entry><structfield>COM_data</structfield>[60]</entry> + <entry></entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>jpeg_markers</structfield></entry> + <entry>See <xref linkend="jpeg-markers"/>. Deprecated. + If <link linkend="jpeg-active-marker-control"><constant> + V4L2_CID_JPEG_ACTIVE_MARKER</constant></link> control + is exposed by a driver applications should use it instead + and ignore this field.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="jpeg-markers"> + <title>JPEG Markers Flags</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_JPEG_MARKER_DHT</constant></entry> + <entry>(1<<3)</entry> + <entry>Define Huffman Tables</entry> + </row> + <row> + <entry><constant>V4L2_JPEG_MARKER_DQT</constant></entry> + <entry>(1<<4)</entry> + <entry>Define Quantization Tables</entry> + </row> + <row> + <entry><constant>V4L2_JPEG_MARKER_DRI</constant></entry> + <entry>(1<<5)</entry> + <entry>Define Restart Interval</entry> + </row> + <row> + <entry><constant>V4L2_JPEG_MARKER_COM</constant></entry> + <entry>(1<<6)</entry> + <entry>Comment segment</entry> + </row> + <row> + <entry><constant>V4L2_JPEG_MARKER_APP</constant></entry> + <entry>(1<<7)</entry> + <entry>App segment, driver will always use APP0</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-g-modulator.xml b/Documentation/DocBook/media/v4l/vidioc-g-modulator.xml new file mode 100644 index 00000000000..7068b599a00 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-g-modulator.xml @@ -0,0 +1,240 @@ +<refentry id="vidioc-g-modulator"> + <refmeta> + <refentrytitle>ioctl VIDIOC_G_MODULATOR, VIDIOC_S_MODULATOR</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_G_MODULATOR</refname> + <refname>VIDIOC_S_MODULATOR</refname> + <refpurpose>Get or set modulator attributes</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_modulator +*<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>const struct v4l2_modulator +*<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_G_MODULATOR, VIDIOC_S_MODULATOR</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>To query the attributes of a modulator applications initialize +the <structfield>index</structfield> field and zero out the +<structfield>reserved</structfield> array of a &v4l2-modulator; and +call the <constant>VIDIOC_G_MODULATOR</constant> ioctl with a pointer +to this structure. Drivers fill the rest of the structure or return an +&EINVAL; when the index is out of bounds. To enumerate all modulators +applications shall begin at index zero, incrementing by one until the +driver returns <errorcode>EINVAL</errorcode>.</para> + + <para>Modulators have two writable properties, an audio +modulation set and the radio frequency. To change the modulated audio +subprograms, applications initialize the <structfield>index +</structfield> and <structfield>txsubchans</structfield> fields and the +<structfield>reserved</structfield> array and call the +<constant>VIDIOC_S_MODULATOR</constant> ioctl. Drivers may choose a +different audio modulation if the request cannot be satisfied. However +this is a write-only ioctl, it does not return the actual audio +modulation selected.</para> + + <para>To change the radio frequency the &VIDIOC-S-FREQUENCY; ioctl +is available.</para> + + <table pgwide="1" frame="none" id="v4l2-modulator"> + <title>struct <structname>v4l2_modulator</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>index</structfield></entry> + <entry>Identifies the modulator, set by the +application.</entry> + </row> + <row> + <entry>__u8</entry> + <entry><structfield>name</structfield>[32]</entry> + <entry>Name of the modulator, a NUL-terminated ASCII +string. This information is intended for the user.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>capability</structfield></entry> + <entry>Modulator capability flags. No flags are defined +for this field, the tuner flags in &v4l2-tuner; +are used accordingly. The audio flags indicate the ability +to encode audio subprograms. They will <emphasis>not</emphasis> +change for example with the current video standard.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>rangelow</structfield></entry> + <entry>The lowest tunable frequency in units of 62.5 +KHz, or if the <structfield>capability</structfield> flag +<constant>V4L2_TUNER_CAP_LOW</constant> is set, in units of 62.5 +Hz, or if the <structfield>capability</structfield> flag +<constant>V4L2_TUNER_CAP_1HZ</constant> is set, in units of 1 Hz.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>rangehigh</structfield></entry> + <entry>The highest tunable frequency in units of 62.5 +KHz, or if the <structfield>capability</structfield> flag +<constant>V4L2_TUNER_CAP_LOW</constant> is set, in units of 62.5 +Hz, or if the <structfield>capability</structfield> flag +<constant>V4L2_TUNER_CAP_1HZ</constant> is set, in units of 1 Hz.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>txsubchans</structfield></entry> + <entry>With this field applications can determine how +audio sub-carriers shall be modulated. It contains a set of flags as +defined in <xref linkend="modulator-txsubchans" />. Note the tuner +<structfield>rxsubchans</structfield> flags are reused, but the +semantics are different. Video output devices are assumed to have an +analog or PCM audio input with 1-3 channels. The +<structfield>txsubchans</structfield> flags select one or more +channels for modulation, together with some audio subprogram +indicator, for example a stereo pilot tone.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[4]</entry> + <entry>Reserved for future extensions. Drivers and +applications must set the array to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="modulator-txsubchans"> + <title>Modulator Audio Transmission Flags</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_TUNER_SUB_MONO</constant></entry> + <entry>0x0001</entry> + <entry>Modulate channel 1 as mono audio, when the input +has more channels, a down-mix of channel 1 and 2. This flag does not +combine with <constant>V4L2_TUNER_SUB_STEREO</constant> or +<constant>V4L2_TUNER_SUB_LANG1</constant>.</entry> + </row> + <row> + <entry><constant>V4L2_TUNER_SUB_STEREO</constant></entry> + <entry>0x0002</entry> + <entry>Modulate channel 1 and 2 as left and right +channel of a stereo audio signal. When the input has only one channel +or two channels and <constant>V4L2_TUNER_SUB_SAP</constant> is also +set, channel 1 is encoded as left and right channel. This flag does +not combine with <constant>V4L2_TUNER_SUB_MONO</constant> or +<constant>V4L2_TUNER_SUB_LANG1</constant>. When the driver does not +support stereo audio it shall fall back to mono.</entry> + </row> + <row> + <entry><constant>V4L2_TUNER_SUB_LANG1</constant></entry> + <entry>0x0008</entry> + <entry>Modulate channel 1 and 2 as primary and secondary +language of a bilingual audio signal. When the input has only one +channel it is used for both languages. It is not possible to encode +the primary or secondary language only. This flag does not combine +with <constant>V4L2_TUNER_SUB_MONO</constant>, +<constant>V4L2_TUNER_SUB_STEREO</constant> or +<constant>V4L2_TUNER_SUB_SAP</constant>. If the hardware does not +support the respective audio matrix, or the current video standard +does not permit bilingual audio the +<constant>VIDIOC_S_MODULATOR</constant> ioctl shall return an &EINVAL; +and the driver shall fall back to mono or stereo mode.</entry> + </row> + <row> + <entry><constant>V4L2_TUNER_SUB_LANG2</constant></entry> + <entry>0x0004</entry> + <entry>Same effect as +<constant>V4L2_TUNER_SUB_SAP</constant>.</entry> + </row> + <row> + <entry><constant>V4L2_TUNER_SUB_SAP</constant></entry> + <entry>0x0004</entry> + <entry>When combined with <constant>V4L2_TUNER_SUB_MONO +</constant> the first channel is encoded as mono audio, the last +channel as Second Audio Program. When the input has only one channel +it is used for both audio tracks. When the input has three channels +the mono track is a down-mix of channel 1 and 2. When combined with +<constant>V4L2_TUNER_SUB_STEREO</constant> channel 1 and 2 are +encoded as left and right stereo audio, channel 3 as Second Audio +Program. When the input has only two channels, the first is encoded as +left and right channel and the second as SAP. When the input has only +one channel it is used for all audio tracks. It is not possible to +encode a Second Audio Program only. This flag must combine with +<constant>V4L2_TUNER_SUB_MONO</constant> or +<constant>V4L2_TUNER_SUB_STEREO</constant>. If the hardware does not +support the respective audio matrix, or the current video standard +does not permit SAP the <constant>VIDIOC_S_MODULATOR</constant> ioctl +shall return an &EINVAL; and driver shall fall back to mono or stereo +mode.</entry> + </row> + <row> + <entry><constant>V4L2_TUNER_SUB_RDS</constant></entry> + <entry>0x0010</entry> + <entry>Enable the RDS encoder for a radio FM transmitter.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The &v4l2-modulator; +<structfield>index</structfield> is out of bounds.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-g-output.xml b/Documentation/DocBook/media/v4l/vidioc-g-output.xml new file mode 100644 index 00000000000..4533068ecb8 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-g-output.xml @@ -0,0 +1,85 @@ +<refentry id="vidioc-g-output"> + <refmeta> + <refentrytitle>ioctl VIDIOC_G_OUTPUT, VIDIOC_S_OUTPUT</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_G_OUTPUT</refname> + <refname>VIDIOC_S_OUTPUT</refname> + <refpurpose>Query or select the current video output</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>int *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_G_OUTPUT, VIDIOC_S_OUTPUT</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>To query the current video output applications call the +<constant>VIDIOC_G_OUTPUT</constant> ioctl with a pointer to an integer +where the driver stores the number of the output, as in the +&v4l2-output; <structfield>index</structfield> field. This ioctl +will fail only when there are no video outputs, returning the +&EINVAL;.</para> + + <para>To select a video output applications store the number of the +desired output in an integer and call the +<constant>VIDIOC_S_OUTPUT</constant> ioctl with a pointer to this integer. +Side effects are possible. For example outputs may support different +video standards, so the driver may implicitly switch the current +standard. +standard. Because of these possible side effects applications +must select an output before querying or negotiating any other parameters.</para> + + <para>Information about video outputs is available using the +&VIDIOC-ENUMOUTPUT; ioctl.</para> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The number of the video output is out of bounds, or +there are no video outputs at all.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-g-parm.xml b/Documentation/DocBook/media/v4l/vidioc-g-parm.xml new file mode 100644 index 00000000000..f4e28e7d475 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-g-parm.xml @@ -0,0 +1,314 @@ +<refentry id="vidioc-g-parm"> + <refmeta> + <refentrytitle>ioctl VIDIOC_G_PARM, VIDIOC_S_PARM</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_G_PARM</refname> + <refname>VIDIOC_S_PARM</refname> + <refpurpose>Get or set streaming parameters</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>v4l2_streamparm *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_G_PARM, VIDIOC_S_PARM</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>The current video standard determines a nominal number of +frames per second. If less than this number of frames is to be +captured or output, applications can request frame skipping or +duplicating on the driver side. This is especially useful when using +the <function>read()</function> or <function>write()</function>, which +are not augmented by timestamps or sequence counters, and to avoid +unnecessary data copying.</para> + + <para>Further these ioctls can be used to determine the number of +buffers used internally by a driver in read/write mode. For +implications see the section discussing the &func-read; +function.</para> + + <para>To get and set the streaming parameters applications call +the <constant>VIDIOC_G_PARM</constant> and +<constant>VIDIOC_S_PARM</constant> ioctl, respectively. They take a +pointer to a struct <structname>v4l2_streamparm</structname> which +contains a union holding separate parameters for input and output +devices.</para> + + <table pgwide="1" frame="none" id="v4l2-streamparm"> + <title>struct <structname>v4l2_streamparm</structname></title> + <tgroup cols="4"> + &cs-ustr; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>type</structfield></entry> + <entry></entry> + <entry>The buffer (stream) type, same as &v4l2-format; +<structfield>type</structfield>, set by the application. See <xref + linkend="v4l2-buf-type" /></entry> + </row> + <row> + <entry>union</entry> + <entry><structfield>parm</structfield></entry> + <entry></entry> + <entry></entry> + </row> + <row> + <entry></entry> + <entry>&v4l2-captureparm;</entry> + <entry><structfield>capture</structfield></entry> + <entry>Parameters for capture devices, used when +<structfield>type</structfield> is +<constant>V4L2_BUF_TYPE_VIDEO_CAPTURE</constant>.</entry> + </row> + <row> + <entry></entry> + <entry>&v4l2-outputparm;</entry> + <entry><structfield>output</structfield></entry> + <entry>Parameters for output devices, used when +<structfield>type</structfield> is +<constant>V4L2_BUF_TYPE_VIDEO_OUTPUT</constant>.</entry> + </row> + <row> + <entry></entry> + <entry>__u8</entry> + <entry><structfield>raw_data</structfield>[200]</entry> + <entry>A place holder for future extensions.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="v4l2-captureparm"> + <title>struct <structname>v4l2_captureparm</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>capability</structfield></entry> + <entry>See <xref linkend="parm-caps" />.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>capturemode</structfield></entry> + <entry>Set by drivers and applications, see <xref linkend="parm-flags" />.</entry> + </row> + <row> + <entry>&v4l2-fract;</entry> + <entry><structfield>timeperframe</structfield></entry> + <entry><para>This is the desired period between +successive frames captured by the driver, in seconds. The +field is intended to skip frames on the driver side, saving I/O +bandwidth.</para><para>Applications store here the desired frame +period, drivers return the actual frame period, which must be greater +or equal to the nominal frame period determined by the current video +standard (&v4l2-standard; <structfield>frameperiod</structfield> +field). Changing the video standard (also implicitly by switching the +video input) may reset this parameter to the nominal frame period. To +reset manually applications can just set this field to +zero.</para><para>Drivers support this function only when they set the +<constant>V4L2_CAP_TIMEPERFRAME</constant> flag in the +<structfield>capability</structfield> field.</para></entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>extendedmode</structfield></entry> + <entry>Custom (driver specific) streaming parameters. When +unused, applications and drivers must set this field to zero. +Applications using this field should check the driver name and +version, see <xref linkend="querycap" />.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>readbuffers</structfield></entry> + <entry>Applications set this field to the desired number +of buffers used internally by the driver in &func-read; mode. Drivers +return the actual number of buffers. When an application requests zero +buffers, drivers should just return the current setting rather than +the minimum or an error code. For details see <xref + linkend="rw" />.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[4]</entry> + <entry>Reserved for future extensions. Drivers and +applications must set the array to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="v4l2-outputparm"> + <title>struct <structname>v4l2_outputparm</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>capability</structfield></entry> + <entry>See <xref linkend="parm-caps" />.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>outputmode</structfield></entry> + <entry>Set by drivers and applications, see <xref + linkend="parm-flags" />.</entry> + </row> + <row> + <entry>&v4l2-fract;</entry> + <entry><structfield>timeperframe</structfield></entry> + <entry>This is the desired period between +successive frames output by the driver, in seconds.</entry> + </row> + <row> + <entry spanname="hspan"><para>The field is intended to +repeat frames on the driver side in &func-write; mode (in streaming +mode timestamps can be used to throttle the output), saving I/O +bandwidth.</para><para>Applications store here the desired frame +period, drivers return the actual frame period, which must be greater +or equal to the nominal frame period determined by the current video +standard (&v4l2-standard; <structfield>frameperiod</structfield> +field). Changing the video standard (also implicitly by switching the +video output) may reset this parameter to the nominal frame period. To +reset manually applications can just set this field to +zero.</para><para>Drivers support this function only when they set the +<constant>V4L2_CAP_TIMEPERFRAME</constant> flag in the +<structfield>capability</structfield> field.</para></entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>extendedmode</structfield></entry> + <entry>Custom (driver specific) streaming parameters. When +unused, applications and drivers must set this field to zero. +Applications using this field should check the driver name and +version, see <xref linkend="querycap" />.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>writebuffers</structfield></entry> + <entry>Applications set this field to the desired number +of buffers used internally by the driver in +<function>write()</function> mode. Drivers return the actual number of +buffers. When an application requests zero buffers, drivers should +just return the current setting rather than the minimum or an error +code. For details see <xref linkend="rw" />.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[4]</entry> + <entry>Reserved for future extensions. Drivers and +applications must set the array to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="parm-caps"> + <title>Streaming Parameters Capabilites</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_CAP_TIMEPERFRAME</constant></entry> + <entry>0x1000</entry> + <entry>The frame skipping/repeating controlled by the +<structfield>timeperframe</structfield> field is supported.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="parm-flags"> + <title>Capture Parameters Flags</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_MODE_HIGHQUALITY</constant></entry> + <entry>0x0001</entry> + <entry><para>High quality imaging mode. High quality mode +is intended for still imaging applications. The idea is to get the +best possible image quality that the hardware can deliver. It is not +defined how the driver writer may achieve that; it will depend on the +hardware and the ingenuity of the driver writer. High quality mode is +a different mode from the the regular motion video capture modes. In +high quality mode:<itemizedlist> + <listitem> + <para>The driver may be able to capture higher +resolutions than for motion capture.</para> + </listitem> + <listitem> + <para>The driver may support fewer pixel formats +than motion capture (eg; true color).</para> + </listitem> + <listitem> + <para>The driver may capture and arithmetically +combine multiple successive fields or frames to remove color edge +artifacts and reduce the noise in the video data. +</para> + </listitem> + <listitem> + <para>The driver may capture images in slices like +a scanner in order to handle larger format images than would otherwise +be possible. </para> + </listitem> + <listitem> + <para>An image capture operation may be +significantly slower than motion capture. </para> + </listitem> + <listitem> + <para>Moving objects in the image might have +excessive motion blur. </para> + </listitem> + <listitem> + <para>Capture might only work through the +<function>read()</function> call.</para> + </listitem> + </itemizedlist></para></entry> + </row> + </tbody> + </tgroup> + </table> + + </refsect1> + + <refsect1> + &return-value; + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-g-priority.xml b/Documentation/DocBook/media/v4l/vidioc-g-priority.xml new file mode 100644 index 00000000000..6a81b4fe953 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-g-priority.xml @@ -0,0 +1,135 @@ +<refentry id="vidioc-g-priority"> + <refmeta> + <refentrytitle>ioctl VIDIOC_G_PRIORITY, VIDIOC_S_PRIORITY</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_G_PRIORITY</refname> + <refname>VIDIOC_S_PRIORITY</refname> + <refpurpose>Query or request the access priority associated with a +file descriptor</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>enum v4l2_priority *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>const enum v4l2_priority *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_G_PRIORITY, VIDIOC_S_PRIORITY</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para>Pointer to an enum v4l2_priority type.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>To query the current access priority +applications call the <constant>VIDIOC_G_PRIORITY</constant> ioctl +with a pointer to an enum v4l2_priority variable where the driver stores +the current priority.</para> + + <para>To request an access priority applications store the +desired priority in an enum v4l2_priority variable and call +<constant>VIDIOC_S_PRIORITY</constant> ioctl with a pointer to this +variable.</para> + + <table frame="none" pgwide="1" id="v4l2-priority"> + <title>enum v4l2_priority</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_PRIORITY_UNSET</constant></entry> + <entry>0</entry> + <entry></entry> + </row> + <row> + <entry><constant>V4L2_PRIORITY_BACKGROUND</constant></entry> + <entry>1</entry> + <entry>Lowest priority, usually applications running in +background, for example monitoring VBI transmissions. A proxy +application running in user space will be necessary if multiple +applications want to read from a device at this priority.</entry> + </row> + <row> + <entry><constant>V4L2_PRIORITY_INTERACTIVE</constant></entry> + <entry>2</entry> + <entry></entry> + </row> + <row> + <entry><constant>V4L2_PRIORITY_DEFAULT</constant></entry> + <entry>2</entry> + <entry>Medium priority, usually applications started and +interactively controlled by the user. For example TV viewers, Teletext +browsers, or just "panel" applications to change the channel or video +controls. This is the default priority unless an application requests +another.</entry> + </row> + <row> + <entry><constant>V4L2_PRIORITY_RECORD</constant></entry> + <entry>3</entry> + <entry>Highest priority. Only one file descriptor can have +this priority, it blocks any other fd from changing device properties. +Usually applications which must not be interrupted, like video +recording.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The requested priority value is invalid.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EBUSY</errorcode></term> + <listitem> + <para>Another application already requested higher +priority.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-g-selection.xml b/Documentation/DocBook/media/v4l/vidioc-g-selection.xml new file mode 100644 index 00000000000..b11ec75e21a --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-g-selection.xml @@ -0,0 +1,241 @@ +<refentry id="vidioc-g-selection"> + + <refmeta> + <refentrytitle>ioctl VIDIOC_G_SELECTION, VIDIOC_S_SELECTION</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_G_SELECTION</refname> + <refname>VIDIOC_S_SELECTION</refname> + <refpurpose>Get or set one of the selection rectangles</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_selection *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_G_SELECTION, VIDIOC_S_SELECTION</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <note> + <title>Experimental</title> + <para>This is an <link linkend="experimental"> experimental </link> + interface and may change in the future.</para> + </note> + + <para>The ioctls are used to query and configure selection rectangles.</para> + +<para> To query the cropping (composing) rectangle set &v4l2-selection; +<structfield> type </structfield> field to the respective buffer type. +Do not use multiplanar buffers. Use <constant> V4L2_BUF_TYPE_VIDEO_CAPTURE +</constant> instead of <constant> V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE +</constant>. Use <constant> V4L2_BUF_TYPE_VIDEO_OUTPUT </constant> instead of +<constant> V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE </constant>. The next step is +setting the value of &v4l2-selection; <structfield>target</structfield> field +to <constant> V4L2_SEL_TGT_CROP </constant> (<constant> +V4L2_SEL_TGT_COMPOSE </constant>). Please refer to table <xref +linkend="v4l2-selections-common" /> or <xref linkend="selection-api" /> for additional +targets. The <structfield>flags</structfield> and <structfield>reserved +</structfield> fields of &v4l2-selection; are ignored and they must be filled +with zeros. The driver fills the rest of the structure or +returns &EINVAL; if incorrect buffer type or target was used. If cropping +(composing) is not supported then the active rectangle is not mutable and it is +always equal to the bounds rectangle. Finally, the &v4l2-rect; +<structfield>r</structfield> rectangle is filled with the current cropping +(composing) coordinates. The coordinates are expressed in driver-dependent +units. The only exception are rectangles for images in raw formats, whose +coordinates are always expressed in pixels. </para> + +<para> To change the cropping (composing) rectangle set the &v4l2-selection; +<structfield>type</structfield> field to the respective buffer type. Do not +use multiplanar buffers. Use <constant> V4L2_BUF_TYPE_VIDEO_CAPTURE +</constant> instead of <constant> V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE +</constant>. Use <constant> V4L2_BUF_TYPE_VIDEO_OUTPUT </constant> instead of +<constant> V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE </constant>. The next step is +setting the value of &v4l2-selection; <structfield>target</structfield> to +<constant>V4L2_SEL_TGT_CROP</constant> (<constant> +V4L2_SEL_TGT_COMPOSE </constant>). Please refer to table <xref +linkend="v4l2-selections-common" /> or <xref linkend="selection-api" /> for additional +targets. The &v4l2-rect; <structfield>r</structfield> rectangle need to be +set to the desired active area. Field &v4l2-selection; <structfield> reserved +</structfield> is ignored and must be filled with zeros. The driver may adjust +coordinates of the requested rectangle. An application may +introduce constraints to control rounding behaviour. The &v4l2-selection; +<structfield>flags</structfield> field must be set to one of the following: + +<itemizedlist> + <listitem> +<para><constant>0</constant> - The driver can adjust the rectangle size freely +and shall choose a crop/compose rectangle as close as possible to the requested +one.</para> + </listitem> + <listitem> +<para><constant>V4L2_SEL_FLAG_GE</constant> - The driver is not allowed to +shrink the rectangle. The original rectangle must lay inside the adjusted +one.</para> + </listitem> + <listitem> +<para><constant>V4L2_SEL_FLAG_LE</constant> - The driver is not allowed to +enlarge the rectangle. The adjusted rectangle must lay inside the original +one.</para> + </listitem> + <listitem> +<para><constant>V4L2_SEL_FLAG_GE | V4L2_SEL_FLAG_LE</constant> - The driver +must choose the size exactly the same as in the requested rectangle.</para> + </listitem> +</itemizedlist> + +Please refer to <xref linkend="sel-const-adjust" />. + +</para> + +<para> The driver may have to adjusts the requested dimensions against hardware +limits and other parts as the pipeline, i.e. the bounds given by the +capture/output window or TV display. The closest possible values of horizontal +and vertical offset and sizes are chosen according to following priority: + +<orderedlist> + <listitem> + <para>Satisfy constraints from &v4l2-selection; <structfield>flags</structfield>.</para> + </listitem> + <listitem> + <para>Adjust width, height, left, and top to hardware limits and alignments.</para> + </listitem> + <listitem> + <para>Keep center of adjusted rectangle as close as possible to the original one.</para> + </listitem> + <listitem> + <para>Keep width and height as close as possible to original ones.</para> + </listitem> + <listitem> + <para>Keep horizontal and vertical offset as close as possible to original ones.</para> + </listitem> +</orderedlist> + +On success the &v4l2-rect; <structfield>r</structfield> field contains +the adjusted rectangle. When the parameters are unsuitable the application may +modify the cropping (composing) or image parameters and repeat the cycle until +satisfactory parameters have been negotiated. If constraints flags have to be +violated at then ERANGE is returned. The error indicates that <emphasis> there +exist no rectangle </emphasis> that satisfies the constraints.</para> + + <para>Selection targets and flags are documented in <xref + linkend="v4l2-selections-common"/>.</para> + + <para> + <figure id="sel-const-adjust"> + <title>Size adjustments with constraint flags.</title> + <mediaobject> + <imageobject> + <imagedata fileref="constraints.png" format="PNG" /> + </imageobject> + <textobject> + <phrase>Behaviour of rectangle adjustment for different constraint + flags.</phrase> + </textobject> + </mediaobject> + </figure> + </para> + + <para> + <table pgwide="1" frame="none" id="v4l2-selection"> + <title>struct <structname>v4l2_selection</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>type</structfield></entry> + <entry>Type of the buffer (from &v4l2-buf-type;).</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>target</structfield></entry> + <entry>Used to select between <link linkend="v4l2-selections-common"> cropping + and composing rectangles</link>.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>flags</structfield></entry> + <entry>Flags controlling the selection rectangle adjustments, refer to + <link linkend="v4l2-selection-flags">selection flags</link>.</entry> + </row> + <row> + <entry>&v4l2-rect;</entry> + <entry><structfield>r</structfield></entry> + <entry>The selection rectangle.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved[9]</structfield></entry> + <entry>Reserved fields for future use.</entry> + </row> + </tbody> + </tgroup> + </table> + </para> + </refsect1> + + <refsect1> + &return-value; + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>Given buffer type <structfield>type</structfield> or +the selection target <structfield>target</structfield> is not supported, +or the <structfield>flags</structfield> argument is not valid.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>ERANGE</errorcode></term> + <listitem> + <para>It is not possible to adjust &v4l2-rect; <structfield> +r</structfield> rectangle to satisfy all contraints given in the +<structfield>flags</structfield> argument.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EBUSY</errorcode></term> + <listitem> + <para>It is not possible to apply change of the selection rectangle +at the moment. Usually because streaming is in progress.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-g-sliced-vbi-cap.xml b/Documentation/DocBook/media/v4l/vidioc-g-sliced-vbi-cap.xml new file mode 100644 index 00000000000..bd015d1563f --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-g-sliced-vbi-cap.xml @@ -0,0 +1,255 @@ +<refentry id="vidioc-g-sliced-vbi-cap"> + <refmeta> + <refentrytitle>ioctl VIDIOC_G_SLICED_VBI_CAP</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_G_SLICED_VBI_CAP</refname> + <refpurpose>Query sliced VBI capabilities</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_sliced_vbi_cap *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_G_SLICED_VBI_CAP</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>To find out which data services are supported by a sliced +VBI capture or output device, applications initialize the +<structfield>type</structfield> field of a &v4l2-sliced-vbi-cap;, +clear the <structfield>reserved</structfield> array and +call the <constant>VIDIOC_G_SLICED_VBI_CAP</constant> ioctl. The +driver fills in the remaining fields or returns an &EINVAL; if the +sliced VBI API is unsupported or <structfield>type</structfield> +is invalid.</para> + + <para>Note the <structfield>type</structfield> field was added, +and the ioctl changed from read-only to write-read, in Linux 2.6.19.</para> + + <table pgwide="1" frame="none" id="v4l2-sliced-vbi-cap"> + <title>struct <structname>v4l2_sliced_vbi_cap</structname></title> + <tgroup cols="5"> + <colspec colname="c1" colwidth="3*" /> + <colspec colname="c2" colwidth="3*" /> + <colspec colname="c3" colwidth="2*" /> + <colspec colname="c4" colwidth="2*" /> + <colspec colname="c5" colwidth="2*" /> + <spanspec spanname="hspan" namest="c3" nameend="c5" /> + <tbody valign="top"> + <row> + <entry>__u16</entry> + <entry><structfield>service_set</structfield></entry> + <entry spanname="hspan">A set of all data services +supported by the driver. Equal to the union of all elements of the +<structfield>service_lines </structfield> array.</entry> + </row> + <row> + <entry>__u16</entry> + <entry><structfield>service_lines</structfield>[2][24]</entry> + <entry spanname="hspan">Each element of this array +contains a set of data services the hardware can look for or insert +into a particular scan line. Data services are defined in <xref + linkend="vbi-services" />. Array indices map to ITU-R +line numbers (see also <xref + linkend="vbi-525" /> and <xref +linkend="vbi-625" />) as follows:</entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry>Element</entry> + <entry>525 line systems</entry> + <entry>625 line systems</entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry><structfield>service_lines</structfield>[0][1]</entry> + <entry align="center">1</entry> + <entry align="center">1</entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry><structfield>service_lines</structfield>[0][23]</entry> + <entry align="center">23</entry> + <entry align="center">23</entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry><structfield>service_lines</structfield>[1][1]</entry> + <entry align="center">264</entry> + <entry align="center">314</entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry><structfield>service_lines</structfield>[1][23]</entry> + <entry align="center">286</entry> + <entry align="center">336</entry> + </row> + <row> + <entry></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry spanname="hspan">The number of VBI lines the +hardware can capture or output per frame, or the number of services it +can identify on a given line may be limited. For example on PAL line +16 the hardware may be able to look for a VPS or Teletext signal, but +not both at the same time. Applications can learn about these limits +using the &VIDIOC-S-FMT; ioctl as described in <xref + linkend="sliced" />.</entry> + </row> + <row> + <entry></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry spanname="hspan">Drivers must set +<structfield>service_lines</structfield>[0][0] and +<structfield>service_lines</structfield>[1][0] to zero.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>type</structfield></entry> + <entry>Type of the data stream, see <xref + linkend="v4l2-buf-type" />. Should be +<constant>V4L2_BUF_TYPE_SLICED_VBI_CAPTURE</constant> or +<constant>V4L2_BUF_TYPE_SLICED_VBI_OUTPUT</constant>.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[3]</entry> + <entry spanname="hspan">This array is reserved for future +extensions. Applications and drivers must set it to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + + <!-- See also dev-sliced-vbi.sgml --> + <table pgwide="1" frame="none" id="vbi-services"> + <title>Sliced VBI services</title> + <tgroup cols="5"> + <colspec colname="c1" colwidth="2*" /> + <colspec colname="c2" colwidth="1*" /> + <colspec colname="c3" colwidth="1*" /> + <colspec colname="c4" colwidth="2*" /> + <colspec colname="c5" colwidth="2*" /> + <spanspec spanname='rlp' namest='c3' nameend='c5' /> + <thead> + <row> + <entry>Symbol</entry> + <entry>Value</entry> + <entry>Reference</entry> + <entry>Lines, usually</entry> + <entry>Payload</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry><constant>V4L2_SLICED_TELETEXT_B</constant> (Teletext +System B)</entry> + <entry>0x0001</entry> + <entry><xref linkend="ets300706" />, <xref linkend="itu653" /></entry> + <entry>PAL/SECAM line 7-22, 320-335 (second field 7-22)</entry> + <entry>Last 42 of the 45 byte Teletext packet, that is +without clock run-in and framing code, lsb first transmitted.</entry> + </row> + <row> + <entry><constant>V4L2_SLICED_VPS</constant></entry> + <entry>0x0400</entry> + <entry><xref linkend="ets300231" /></entry> + <entry>PAL line 16</entry> + <entry>Byte number 3 to 15 according to Figure 9 of +ETS 300 231, lsb first transmitted.</entry> + </row> + <row> + <entry><constant>V4L2_SLICED_CAPTION_525</constant></entry> + <entry>0x1000</entry> + <entry><xref linkend="eia608" /></entry> + <entry>NTSC line 21, 284 (second field 21)</entry> + <entry>Two bytes in transmission order, including parity +bit, lsb first transmitted.</entry> + </row> + <row> + <entry><constant>V4L2_SLICED_WSS_625</constant></entry> + <entry>0x4000</entry> + <entry><xref linkend="en300294" />, <xref linkend="itu1119" /></entry> + <entry>PAL/SECAM line 23</entry> + <entry><screen> +Byte 0 1 + msb lsb msb lsb +Bit 7 6 5 4 3 2 1 0 x x 13 12 11 10 9 +</screen></entry> + </row> + <row> + <entry><constant>V4L2_SLICED_VBI_525</constant></entry> + <entry>0x1000</entry> + <entry spanname="rlp">Set of services applicable to 525 +line systems.</entry> + </row> + <row> + <entry><constant>V4L2_SLICED_VBI_625</constant></entry> + <entry>0x4401</entry> + <entry spanname="rlp">Set of services applicable to 625 +line systems.</entry> + </row> + </tbody> + </tgroup> + </table> + + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The value in the <structfield>type</structfield> field is +wrong.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-g-std.xml b/Documentation/DocBook/media/v4l/vidioc-g-std.xml new file mode 100644 index 00000000000..4a898417de2 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-g-std.xml @@ -0,0 +1,98 @@ +<refentry id="vidioc-g-std"> + <refmeta> + <refentrytitle>ioctl VIDIOC_G_STD, VIDIOC_S_STD</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_G_STD</refname> + <refname>VIDIOC_S_STD</refname> + <refpurpose>Query or select the video standard of the current input</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>v4l2_std_id +*<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>const v4l2_std_id +*<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_G_STD, VIDIOC_S_STD</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>To query and select the current video standard applications +use the <constant>VIDIOC_G_STD</constant> and <constant>VIDIOC_S_STD</constant> ioctls which take a pointer to a +&v4l2-std-id; type as argument. <constant>VIDIOC_G_STD</constant> can +return a single flag or a set of flags as in &v4l2-standard; field +<structfield>id</structfield>. The flags must be unambiguous such +that they appear in only one enumerated <structname>v4l2_standard</structname> structure.</para> + + <para><constant>VIDIOC_S_STD</constant> accepts one or more +flags, being a write-only ioctl it does not return the actual new standard as +<constant>VIDIOC_G_STD</constant> does. When no flags are given or +the current input does not support the requested standard the driver +returns an &EINVAL;. When the standard set is ambiguous drivers may +return <errorcode>EINVAL</errorcode> or choose any of the requested +standards. If the current input or output does not support standard video timings (e.g. if +&VIDIOC-ENUMINPUT; does not set the <constant>V4L2_IN_CAP_STD</constant> flag), then +&ENODATA; is returned.</para> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The <constant>VIDIOC_S_STD</constant> parameter was unsuitable.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>ENODATA</errorcode></term> + <listitem> + <para>Standard video timings are not supported for this input or output.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-g-tuner.xml b/Documentation/DocBook/media/v4l/vidioc-g-tuner.xml new file mode 100644 index 00000000000..b0d865933da --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-g-tuner.xml @@ -0,0 +1,578 @@ +<refentry id="vidioc-g-tuner"> + <refmeta> + <refentrytitle>ioctl VIDIOC_G_TUNER, VIDIOC_S_TUNER</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_G_TUNER</refname> + <refname>VIDIOC_S_TUNER</refname> + <refpurpose>Get or set tuner attributes</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_tuner +*<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>const struct v4l2_tuner +*<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_G_TUNER, VIDIOC_S_TUNER</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>To query the attributes of a tuner applications initialize the +<structfield>index</structfield> field and zero out the +<structfield>reserved</structfield> array of a &v4l2-tuner; and call the +<constant>VIDIOC_G_TUNER</constant> ioctl with a pointer to this +structure. Drivers fill the rest of the structure or return an +&EINVAL; when the index is out of bounds. To enumerate all tuners +applications shall begin at index zero, incrementing by one until the +driver returns <errorcode>EINVAL</errorcode>.</para> + + <para>Tuners have two writable properties, the audio mode and +the radio frequency. To change the audio mode, applications initialize +the <structfield>index</structfield>, +<structfield>audmode</structfield> and +<structfield>reserved</structfield> fields and call the +<constant>VIDIOC_S_TUNER</constant> ioctl. This will +<emphasis>not</emphasis> change the current tuner, which is determined +by the current video input. Drivers may choose a different audio mode +if the requested mode is invalid or unsupported. Since this is a +<!-- FIXME -->write-only ioctl, it does not return the actually +selected audio mode.</para> + + <para>To change the radio frequency the &VIDIOC-S-FREQUENCY; ioctl +is available.</para> + + <table pgwide="1" frame="none" id="v4l2-tuner"> + <title>struct <structname>v4l2_tuner</structname></title> + <tgroup cols="3"> + <colspec colname="c1" colwidth="1*" /> + <colspec colname="c2" colwidth="1*" /> + <colspec colname="c3" colwidth="1*" /> + <colspec colname="c4" colwidth="1*" /> + <spanspec spanname="hspan" namest="c3" nameend="c4" /> + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>index</structfield></entry> + <entry spanname="hspan">Identifies the tuner, set by the +application.</entry> + </row> + <row> + <entry>__u8</entry> + <entry><structfield>name</structfield>[32]</entry> + <entry spanname="hspan"><para>Name of the tuner, a +NUL-terminated ASCII string. This information is intended for the +user.<!-- FIXME Video inputs already have a name, the purpose of this +field is not quite clear.--></para></entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>type</structfield></entry> + <entry spanname="hspan">Type of the tuner, see <xref + linkend="v4l2-tuner-type" />.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>capability</structfield></entry> + <entry spanname="hspan"><para>Tuner capability flags, see +<xref linkend="tuner-capability" />. Audio flags indicate the ability +to decode audio subprograms. They will <emphasis>not</emphasis> +change, for example with the current video standard.</para><para>When +the structure refers to a radio tuner the +<constant>V4L2_TUNER_CAP_LANG1</constant>, +<constant>V4L2_TUNER_CAP_LANG2</constant> and +<constant>V4L2_TUNER_CAP_NORM</constant> flags can't be used.</para> +<para>If multiple frequency bands are supported, then +<structfield>capability</structfield> is the union of all +<structfield>capability</structfield> fields of each &v4l2-frequency-band;. +</para></entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>rangelow</structfield></entry> + <entry spanname="hspan">The lowest tunable frequency in +units of 62.5 kHz, or if the <structfield>capability</structfield> +flag <constant>V4L2_TUNER_CAP_LOW</constant> is set, in units of 62.5 +Hz, or if the <structfield>capability</structfield> flag +<constant>V4L2_TUNER_CAP_1HZ</constant> is set, in units of 1 Hz. +If multiple frequency bands are supported, then +<structfield>rangelow</structfield> is the lowest frequency +of all the frequency bands.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>rangehigh</structfield></entry> + <entry spanname="hspan">The highest tunable frequency in +units of 62.5 kHz, or if the <structfield>capability</structfield> +flag <constant>V4L2_TUNER_CAP_LOW</constant> is set, in units of 62.5 +Hz, or if the <structfield>capability</structfield> flag +<constant>V4L2_TUNER_CAP_1HZ</constant> is set, in units of 1 Hz. +If multiple frequency bands are supported, then +<structfield>rangehigh</structfield> is the highest frequency +of all the frequency bands.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>rxsubchans</structfield></entry> + <entry spanname="hspan"><para>Some tuners or audio +decoders can determine the received audio subprograms by analyzing +audio carriers, pilot tones or other indicators. To pass this +information drivers set flags defined in <xref + linkend="tuner-rxsubchans" /> in this field. For +example:</para></entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry><constant>V4L2_TUNER_SUB_MONO</constant></entry> + <entry>receiving mono audio</entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry><constant>STEREO | SAP</constant></entry> + <entry>receiving stereo audio and a secondary audio +program</entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry><constant>MONO | STEREO</constant></entry> + <entry>receiving mono or stereo audio, the hardware cannot +distinguish</entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry><constant>LANG1 | LANG2</constant></entry> + <entry>receiving bilingual audio</entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry><constant>MONO | STEREO | LANG1 | LANG2</constant></entry> + <entry>receiving mono, stereo or bilingual +audio</entry> + </row> + <row> + <entry></entry> + <entry></entry> + <entry spanname="hspan"><para>When the +<constant>V4L2_TUNER_CAP_STEREO</constant>, +<constant>_LANG1</constant>, <constant>_LANG2</constant> or +<constant>_SAP</constant> flag is cleared in the +<structfield>capability</structfield> field, the corresponding +<constant>V4L2_TUNER_SUB_</constant> flag must not be set +here.</para><para>This field is valid only if this is the tuner of the +current video input, or when the structure refers to a radio +tuner.</para></entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>audmode</structfield></entry> + <entry spanname="hspan"><para>The selected audio mode, see +<xref linkend="tuner-audmode" /> for valid values. The audio mode does +not affect audio subprogram detection, and like a <link +linkend="control">control</link> it does not automatically change +unless the requested mode is invalid or unsupported. See <xref + linkend="tuner-matrix" /> for possible results when +the selected and received audio programs do not +match.</para><para>Currently this is the only field of struct +<structname>v4l2_tuner</structname> applications can +change.</para></entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>signal</structfield></entry> + <entry spanname="hspan">The signal strength if known, ranging +from 0 to 65535. Higher values indicate a better signal.</entry> + </row> + <row> + <entry>__s32</entry> + <entry><structfield>afc</structfield></entry> + <entry spanname="hspan">Automatic frequency control: When the +<structfield>afc</structfield> value is negative, the frequency is too +low, when positive too high.<!-- FIXME need example what to do when it never +settles at zero, &ie; range is what? --></entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[4]</entry> + <entry spanname="hspan">Reserved for future extensions. Drivers and +applications must set the array to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="v4l2-tuner-type"> + <title>enum v4l2_tuner_type</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_TUNER_RADIO</constant></entry> + <entry>1</entry> + <entry></entry> + </row> + <row> + <entry><constant>V4L2_TUNER_ANALOG_TV</constant></entry> + <entry>2</entry> + <entry></entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="tuner-capability"> + <title>Tuner and Modulator Capability Flags</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_TUNER_CAP_LOW</constant></entry> + <entry>0x0001</entry> + <entry>When set, tuning frequencies are expressed in units of +62.5 Hz instead of 62.5 kHz.</entry> + </row> + <row> + <entry><constant>V4L2_TUNER_CAP_NORM</constant></entry> + <entry>0x0002</entry> + <entry>This is a multi-standard tuner; the video standard +can or must be switched. (B/G PAL tuners for example are typically not + considered multi-standard because the video standard is automatically + determined from the frequency band.) The set of supported video + standards is available from the &v4l2-input; pointing to this tuner, + see the description of ioctl &VIDIOC-ENUMINPUT; for details. Only + <constant>V4L2_TUNER_ANALOG_TV</constant> tuners can have this capability.</entry> + </row> + <row> + <entry><constant>V4L2_TUNER_CAP_HWSEEK_BOUNDED</constant></entry> + <entry>0x0004</entry> + <entry>If set, then this tuner supports the hardware seek functionality + where the seek stops when it reaches the end of the frequency range.</entry> + </row> + <row> + <entry><constant>V4L2_TUNER_CAP_HWSEEK_WRAP</constant></entry> + <entry>0x0008</entry> + <entry>If set, then this tuner supports the hardware seek functionality + where the seek wraps around when it reaches the end of the frequency range.</entry> + </row> + <row> + <entry><constant>V4L2_TUNER_CAP_STEREO</constant></entry> + <entry>0x0010</entry> + <entry>Stereo audio reception is supported.</entry> + </row> + <row> + <entry><constant>V4L2_TUNER_CAP_LANG1</constant></entry> + <entry>0x0040</entry> + <entry>Reception of the primary language of a bilingual +audio program is supported. Bilingual audio is a feature of +two-channel systems, transmitting the primary language monaural on the +main audio carrier and a secondary language monaural on a second +carrier. Only + <constant>V4L2_TUNER_ANALOG_TV</constant> tuners can have this capability.</entry> + </row> + <row> + <entry><constant>V4L2_TUNER_CAP_LANG2</constant></entry> + <entry>0x0020</entry> + <entry>Reception of the secondary language of a bilingual +audio program is supported. Only + <constant>V4L2_TUNER_ANALOG_TV</constant> tuners can have this capability.</entry> + </row> + <row> + <entry><constant>V4L2_TUNER_CAP_SAP</constant></entry> + <entry>0x0020</entry> + <entry><para>Reception of a secondary audio program is +supported. This is a feature of the BTSC system which accompanies the +NTSC video standard. Two audio carriers are available for mono or +stereo transmissions of a primary language, and an independent third +carrier for a monaural secondary language. Only + <constant>V4L2_TUNER_ANALOG_TV</constant> tuners can have this capability.</para><para>Note the +<constant>V4L2_TUNER_CAP_LANG2</constant> and +<constant>V4L2_TUNER_CAP_SAP</constant> flags are synonyms. +<constant>V4L2_TUNER_CAP_SAP</constant> applies when the tuner +supports the <constant>V4L2_STD_NTSC_M</constant> video +standard.</para><!-- FIXME what if PAL+NTSC and Bi but not SAP? --></entry> + </row> + <row> + <entry><constant>V4L2_TUNER_CAP_RDS</constant></entry> + <entry>0x0080</entry> + <entry>RDS capture is supported. This capability is only valid for +radio tuners.</entry> + </row> + <row> + <entry><constant>V4L2_TUNER_CAP_RDS_BLOCK_IO</constant></entry> + <entry>0x0100</entry> + <entry>The RDS data is passed as unparsed RDS blocks.</entry> + </row> + <row> + <entry><constant>V4L2_TUNER_CAP_RDS_CONTROLS</constant></entry> + <entry>0x0200</entry> + <entry>The RDS data is parsed by the hardware and set via controls.</entry> + </row> + <row> + <entry><constant>V4L2_TUNER_CAP_FREQ_BANDS</constant></entry> + <entry>0x0400</entry> + <entry>The &VIDIOC-ENUM-FREQ-BANDS; ioctl can be used to enumerate + the available frequency bands.</entry> + </row> + <row> + <entry><constant>V4L2_TUNER_CAP_HWSEEK_PROG_LIM</constant></entry> + <entry>0x0800</entry> + <entry>The range to search when using the hardware seek functionality + is programmable, see &VIDIOC-S-HW-FREQ-SEEK; for details.</entry> + </row> + <row> + <entry><constant>V4L2_TUNER_CAP_1HZ</constant></entry> + <entry>0x1000</entry> + <entry>When set, tuning frequencies are expressed in units of 1 Hz instead of 62.5 kHz.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="tuner-rxsubchans"> + <title>Tuner Audio Reception Flags</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_TUNER_SUB_MONO</constant></entry> + <entry>0x0001</entry> + <entry>The tuner receives a mono audio signal.</entry> + </row> + <row> + <entry><constant>V4L2_TUNER_SUB_STEREO</constant></entry> + <entry>0x0002</entry> + <entry>The tuner receives a stereo audio signal.</entry> + </row> + <row> + <entry><constant>V4L2_TUNER_SUB_LANG1</constant></entry> + <entry>0x0008</entry> + <entry>The tuner receives the primary language of a +bilingual audio signal. Drivers must clear this flag when the current +video standard is <constant>V4L2_STD_NTSC_M</constant>.</entry> + </row> + <row> + <entry><constant>V4L2_TUNER_SUB_LANG2</constant></entry> + <entry>0x0004</entry> + <entry>The tuner receives the secondary language of a +bilingual audio signal (or a second audio program).</entry> + </row> + <row> + <entry><constant>V4L2_TUNER_SUB_SAP</constant></entry> + <entry>0x0004</entry> + <entry>The tuner receives a Second Audio Program. Note the +<constant>V4L2_TUNER_SUB_LANG2</constant> and +<constant>V4L2_TUNER_SUB_SAP</constant> flags are synonyms. The +<constant>V4L2_TUNER_SUB_SAP</constant> flag applies when the +current video standard is <constant>V4L2_STD_NTSC_M</constant>.</entry> + </row> + <row> + <entry><constant>V4L2_TUNER_SUB_RDS</constant></entry> + <entry>0x0010</entry> + <entry>The tuner receives an RDS channel.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="tuner-audmode"> + <title>Tuner Audio Modes</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_TUNER_MODE_MONO</constant></entry> + <entry>0</entry> + <entry>Play mono audio. When the tuner receives a stereo +signal this a down-mix of the left and right channel. When the tuner +receives a bilingual or SAP signal this mode selects the primary +language.</entry> + </row> + <row> + <entry><constant>V4L2_TUNER_MODE_STEREO</constant></entry> + <entry>1</entry> + <entry><para>Play stereo audio. When the tuner receives +bilingual audio it may play different languages on the left and right +channel or the primary language is played on both channels.</para><para>Playing +different languages in this mode is +deprecated. New drivers should do this only in +<constant>MODE_LANG1_LANG2</constant>.</para><para>When the tuner +receives no stereo signal or does not support stereo reception the +driver shall fall back to <constant>MODE_MONO</constant>.</para></entry> + </row> + <row> + <entry><constant>V4L2_TUNER_MODE_LANG1</constant></entry> + <entry>3</entry> + <entry>Play the primary language, mono or stereo. Only +<constant>V4L2_TUNER_ANALOG_TV</constant> tuners support this +mode.</entry> + </row> + <row> + <entry><constant>V4L2_TUNER_MODE_LANG2</constant></entry> + <entry>2</entry> + <entry>Play the secondary language, mono. When the tuner +receives no bilingual audio or SAP, or their reception is not +supported the driver shall fall back to mono or stereo mode. Only +<constant>V4L2_TUNER_ANALOG_TV</constant> tuners support this +mode.</entry> + </row> + <row> + <entry><constant>V4L2_TUNER_MODE_SAP</constant></entry> + <entry>2</entry> + <entry>Play the Second Audio Program. When the tuner +receives no bilingual audio or SAP, or their reception is not +supported the driver shall fall back to mono or stereo mode. Only +<constant>V4L2_TUNER_ANALOG_TV</constant> tuners support this mode. +Note the <constant>V4L2_TUNER_MODE_LANG2</constant> and +<constant>V4L2_TUNER_MODE_SAP</constant> are synonyms.</entry> + </row> + <row> + <entry><constant>V4L2_TUNER_MODE_LANG1_LANG2</constant></entry> + <entry>4</entry> + <entry>Play the primary language on the left channel, the +secondary language on the right channel. When the tuner receives no +bilingual audio or SAP, it shall fall back to +<constant>MODE_LANG1</constant> or <constant>MODE_MONO</constant>. +Only <constant>V4L2_TUNER_ANALOG_TV</constant> tuners support this +mode.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="all" id="tuner-matrix"> + <title>Tuner Audio Matrix</title> + <tgroup cols="6" align="center"> + <colspec align="left" /> + <colspec colname="c2" colwidth="1*" /> + <colspec colwidth="1*" /> + <colspec colwidth="1*" /> + <colspec colnum="6" colname="c6" colwidth="1*" /> + <spanspec namest="c2" nameend="c6" spanname="hspan" align="center" /> + <thead> + <row> + <entry></entry> + <entry spanname="hspan">Selected +<constant>V4L2_TUNER_MODE_</constant></entry> + </row> + <row> + <entry>Received <constant>V4L2_TUNER_SUB_</constant></entry> + <entry><constant>MONO</constant></entry> + <entry><constant>STEREO</constant></entry> + <entry><constant>LANG1</constant></entry> + <entry><constant>LANG2 = SAP</constant></entry> + <entry><constant>LANG1_LANG2</constant><footnote><para>This +mode has been added in Linux 2.6.17 and may not be supported by older +drivers.</para></footnote></entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry><constant>MONO</constant></entry> + <entry>Mono</entry> + <entry>Mono/Mono</entry> + <entry>Mono</entry> + <entry>Mono</entry> + <entry>Mono/Mono</entry> + </row> + <row> + <entry><constant>MONO | SAP</constant></entry> + <entry>Mono</entry> + <entry>Mono/Mono</entry> + <entry>Mono</entry> + <entry>SAP</entry> + <entry>Mono/SAP (preferred) or Mono/Mono</entry> + </row> + <row> + <entry><constant>STEREO</constant></entry> + <entry>L+R</entry> + <entry>L/R</entry> + <entry>Stereo L/R (preferred) or Mono L+R</entry> + <entry>Stereo L/R (preferred) or Mono L+R</entry> + <entry>L/R (preferred) or L+R/L+R</entry> + </row> + <row> + <entry><constant>STEREO | SAP</constant></entry> + <entry>L+R</entry> + <entry>L/R</entry> + <entry>Stereo L/R (preferred) or Mono L+R</entry> + <entry>SAP</entry> + <entry>L+R/SAP (preferred) or L/R or L+R/L+R</entry> + </row> + <row> + <entry><constant>LANG1 | LANG2</constant></entry> + <entry>Language 1</entry> + <entry>Lang1/Lang2 (deprecated<footnote><para>Playback of +both languages in <constant>MODE_STEREO</constant> is deprecated. In +the future drivers should produce only the primary language in this +mode. Applications should request +<constant>MODE_LANG1_LANG2</constant> to record both languages or a +stereo signal.</para></footnote>) or +Lang1/Lang1</entry> + <entry>Language 1</entry> + <entry>Language 2</entry> + <entry>Lang1/Lang2 (preferred) or Lang1/Lang1</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The &v4l2-tuner; <structfield>index</structfield> is +out of bounds.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-log-status.xml b/Documentation/DocBook/media/v4l/vidioc-log-status.xml new file mode 100644 index 00000000000..5ded7d35e27 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-log-status.xml @@ -0,0 +1,41 @@ +<refentry id="vidioc-log-status"> + <refmeta> + <refentrytitle>ioctl VIDIOC_LOG_STATUS</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_LOG_STATUS</refname> + <refpurpose>Log driver status information</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Description</title> + + <para>As the video/audio devices become more complicated it +becomes harder to debug problems. When this ioctl is called the driver +will output the current device status to the kernel log. This is +particular useful when dealing with problems like no sound, no video +and incorrectly tuned channels. Also many modern devices autodetect +video and audio standards and this ioctl will report what the device +thinks what the standard is. Mismatches may give an indication where +the problem is.</para> + + <para>This ioctl is optional and not all drivers support it. It +was introduced in Linux 2.6.15.</para> + </refsect1> + + <refsect1> + &return-value; + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-overlay.xml b/Documentation/DocBook/media/v4l/vidioc-overlay.xml new file mode 100644 index 00000000000..250a7de1877 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-overlay.xml @@ -0,0 +1,74 @@ +<refentry id="vidioc-overlay"> + <refmeta> + <refentrytitle>ioctl VIDIOC_OVERLAY</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_OVERLAY</refname> + <refpurpose>Start or stop video overlay</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>const int *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_OVERLAY</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>This ioctl is part of the <link linkend="overlay">video + overlay</link> I/O method. Applications call + <constant>VIDIOC_OVERLAY</constant> to start or stop the + overlay. It takes a pointer to an integer which must be set to + zero by the application to stop overlay, to one to start.</para> + + <para>Drivers do not support &VIDIOC-STREAMON; or +&VIDIOC-STREAMOFF; with <constant>V4L2_BUF_TYPE_VIDEO_OVERLAY</constant>.</para> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The overlay parameters have not been set up. See <xref +linkend="overlay" /> for the necessary steps.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-prepare-buf.xml b/Documentation/DocBook/media/v4l/vidioc-prepare-buf.xml new file mode 100644 index 00000000000..fa7ad7e3322 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-prepare-buf.xml @@ -0,0 +1,94 @@ +<refentry id="vidioc-prepare-buf"> + <refmeta> + <refentrytitle>ioctl VIDIOC_PREPARE_BUF</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_PREPARE_BUF</refname> + <refpurpose>Prepare a buffer for I/O</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_buffer *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_PREPARE_BUF</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <note> + <title>Experimental</title> + <para>This is an <link linkend="experimental"> experimental </link> + interface and may change in the future.</para> + </note> + + <para>Applications can optionally call the +<constant>VIDIOC_PREPARE_BUF</constant> ioctl to pass ownership of the buffer +to the driver before actually enqueuing it, using the +<constant>VIDIOC_QBUF</constant> ioctl, and to prepare it for future I/O. +Such preparations may include cache invalidation or cleaning. Performing them +in advance saves time during the actual I/O. In case such cache operations are +not required, the application can use one of +<constant>V4L2_BUF_FLAG_NO_CACHE_INVALIDATE</constant> and +<constant>V4L2_BUF_FLAG_NO_CACHE_CLEAN</constant> flags to skip the respective +step.</para> + + <para>The <structname>v4l2_buffer</structname> structure is +specified in <xref linkend="buffer" />.</para> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EBUSY</errorcode></term> + <listitem> + <para>File I/O is in progress.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The buffer <structfield>type</structfield> is not +supported, or the <structfield>index</structfield> is out of bounds, +or no buffers have been allocated yet, or the +<structfield>userptr</structfield> or +<structfield>length</structfield> are invalid.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-qbuf.xml b/Documentation/DocBook/media/v4l/vidioc-qbuf.xml new file mode 100644 index 00000000000..3504a7f2f38 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-qbuf.xml @@ -0,0 +1,192 @@ +<refentry id="vidioc-qbuf"> + <refmeta> + <refentrytitle>ioctl VIDIOC_QBUF, VIDIOC_DQBUF</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_QBUF</refname> + <refname>VIDIOC_DQBUF</refname> + <refpurpose>Exchange a buffer with the driver</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_buffer *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_QBUF, VIDIOC_DQBUF</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>Applications call the <constant>VIDIOC_QBUF</constant> ioctl +to enqueue an empty (capturing) or filled (output) buffer in the +driver's incoming queue. The semantics depend on the selected I/O +method.</para> + + <para>To enqueue a buffer applications set the <structfield>type</structfield> +field of a &v4l2-buffer; to the same buffer type as was previously used +with &v4l2-format; <structfield>type</structfield> and &v4l2-requestbuffers; +<structfield>type</structfield>. Applications must also set the +<structfield>index</structfield> field. Valid index numbers range from +zero to the number of buffers allocated with &VIDIOC-REQBUFS; +(&v4l2-requestbuffers; <structfield>count</structfield>) minus one. The +contents of the struct <structname>v4l2_buffer</structname> returned +by a &VIDIOC-QUERYBUF; ioctl will do as well. When the buffer is +intended for output (<structfield>type</structfield> is +<constant>V4L2_BUF_TYPE_VIDEO_OUTPUT</constant>, +<constant>V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE</constant>, or +<constant>V4L2_BUF_TYPE_VBI_OUTPUT</constant>) applications must also +initialize the <structfield>bytesused</structfield>, +<structfield>field</structfield> and +<structfield>timestamp</structfield> fields, see <xref +linkend="buffer" /> for details. +Applications must also set <structfield>flags</structfield> to 0. +The <structfield>reserved2</structfield> and +<structfield>reserved</structfield> fields must be set to 0. When using +the <link linkend="planar-apis">multi-planar API</link>, the +<structfield>m.planes</structfield> field must contain a userspace pointer +to a filled-in array of &v4l2-plane; and the <structfield>length</structfield> +field must be set to the number of elements in that array. +</para> + + <para>To enqueue a <link linkend="mmap">memory mapped</link> +buffer applications set the <structfield>memory</structfield> +field to <constant>V4L2_MEMORY_MMAP</constant>. When +<constant>VIDIOC_QBUF</constant> is called with a pointer to this +structure the driver sets the +<constant>V4L2_BUF_FLAG_MAPPED</constant> and +<constant>V4L2_BUF_FLAG_QUEUED</constant> flags and clears the +<constant>V4L2_BUF_FLAG_DONE</constant> flag in the +<structfield>flags</structfield> field, or it returns an +&EINVAL;.</para> + + <para>To enqueue a <link linkend="userp">user pointer</link> +buffer applications set the <structfield>memory</structfield> +field to <constant>V4L2_MEMORY_USERPTR</constant>, the +<structfield>m.userptr</structfield> field to the address of the +buffer and <structfield>length</structfield> to its size. When the multi-planar +API is used, <structfield>m.userptr</structfield> and +<structfield>length</structfield> members of the passed array of &v4l2-plane; +have to be used instead. When <constant>VIDIOC_QBUF</constant> is called with +a pointer to this structure the driver sets the +<constant>V4L2_BUF_FLAG_QUEUED</constant> flag and clears the +<constant>V4L2_BUF_FLAG_MAPPED</constant> and +<constant>V4L2_BUF_FLAG_DONE</constant> flags in the +<structfield>flags</structfield> field, or it returns an error code. +This ioctl locks the memory pages of the buffer in physical memory, +they cannot be swapped out to disk. Buffers remain locked until +dequeued, until the &VIDIOC-STREAMOFF; or &VIDIOC-REQBUFS; ioctl is +called, or until the device is closed.</para> + + <para>To enqueue a <link linkend="dmabuf">DMABUF</link> buffer applications +set the <structfield>memory</structfield> field to +<constant>V4L2_MEMORY_DMABUF</constant> and the <structfield>m.fd</structfield> +field to a file descriptor associated with a DMABUF buffer. When the +multi-planar API is used the <structfield>m.fd</structfield> fields of the +passed array of &v4l2-plane; have to be used instead. When +<constant>VIDIOC_QBUF</constant> is called with a pointer to this structure the +driver sets the <constant>V4L2_BUF_FLAG_QUEUED</constant> flag and clears the +<constant>V4L2_BUF_FLAG_MAPPED</constant> and +<constant>V4L2_BUF_FLAG_DONE</constant> flags in the +<structfield>flags</structfield> field, or it returns an error code. This +ioctl locks the buffer. Locking a buffer means passing it to a driver for a +hardware access (usually DMA). If an application accesses (reads/writes) a +locked buffer then the result is undefined. Buffers remain locked until +dequeued, until the &VIDIOC-STREAMOFF; or &VIDIOC-REQBUFS; ioctl is called, or +until the device is closed.</para> + + <para>Applications call the <constant>VIDIOC_DQBUF</constant> +ioctl to dequeue a filled (capturing) or displayed (output) buffer +from the driver's outgoing queue. They just set the +<structfield>type</structfield>, <structfield>memory</structfield> +and <structfield>reserved</structfield> +fields of a &v4l2-buffer; as above, when <constant>VIDIOC_DQBUF</constant> +is called with a pointer to this structure the driver fills the +remaining fields or returns an error code. The driver may also set +<constant>V4L2_BUF_FLAG_ERROR</constant> in the <structfield>flags</structfield> +field. It indicates a non-critical (recoverable) streaming error. In such case +the application may continue as normal, but should be aware that data in the +dequeued buffer might be corrupted. When using the multi-planar API, the +planes array must be passed in as well.</para> + + <para>By default <constant>VIDIOC_DQBUF</constant> blocks when no +buffer is in the outgoing queue. When the +<constant>O_NONBLOCK</constant> flag was given to the &func-open; +function, <constant>VIDIOC_DQBUF</constant> returns immediately +with an &EAGAIN; when no buffer is available.</para> + + <para>The <structname>v4l2_buffer</structname> structure is +specified in <xref linkend="buffer" />.</para> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EAGAIN</errorcode></term> + <listitem> + <para>Non-blocking I/O has been selected using +<constant>O_NONBLOCK</constant> and no buffer was in the outgoing +queue.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The buffer <structfield>type</structfield> is not +supported, or the <structfield>index</structfield> is out of bounds, +or no buffers have been allocated yet, or the +<structfield>userptr</structfield> or +<structfield>length</structfield> are invalid.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EIO</errorcode></term> + <listitem> + <para><constant>VIDIOC_DQBUF</constant> failed due to an +internal error. Can also indicate temporary problems like signal +loss. Note the driver might dequeue an (empty) buffer despite +returning an error, or even stop capturing. Reusing such buffer may be unsafe +though and its details (e.g. <structfield>index</structfield>) may not be +returned either. It is recommended that drivers indicate recoverable errors +by setting the <constant>V4L2_BUF_FLAG_ERROR</constant> and returning 0 instead. +In that case the application should be able to safely reuse the buffer and +continue streaming. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-query-dv-timings.xml b/Documentation/DocBook/media/v4l/vidioc-query-dv-timings.xml new file mode 100644 index 00000000000..e185f149e0a --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-query-dv-timings.xml @@ -0,0 +1,110 @@ +<refentry id="vidioc-query-dv-timings"> + <refmeta> + <refentrytitle>ioctl VIDIOC_QUERY_DV_TIMINGS</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_QUERY_DV_TIMINGS</refname> + <refpurpose>Sense the DV preset received by the current +input</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_dv_timings *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_QUERY_DV_TIMINGS</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <note> + <title>Experimental</title> + <para>This is an <link linkend="experimental"> experimental </link> + interface and may change in the future.</para> + </note> + + <para>The hardware may be able to detect the current DV timings +automatically, similar to sensing the video standard. To do so, applications +call <constant>VIDIOC_QUERY_DV_TIMINGS</constant> with a pointer to a +&v4l2-dv-timings;. Once the hardware detects the timings, it will fill in the +timings structure. + +If the timings could not be detected because there was no signal, then +<errorcode>ENOLINK</errorcode> is returned. If a signal was detected, but +it was unstable and the receiver could not lock to the signal, then +<errorcode>ENOLCK</errorcode> is returned. If the receiver could lock to the signal, +but the format is unsupported (e.g. because the pixelclock is out of range +of the hardware capabilities), then the driver fills in whatever timings it +could find and returns <errorcode>ERANGE</errorcode>. In that case the application +can call &VIDIOC-DV-TIMINGS-CAP; to compare the found timings with the hardware's +capabilities in order to give more precise feedback to the user. +</para> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>ENODATA</errorcode></term> + <listitem> + <para>Digital video timings are not supported for this input or output.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>ENOLINK</errorcode></term> + <listitem> + <para>No timings could be detected because no signal was found. +</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>ENOLCK</errorcode></term> + <listitem> + <para>The signal was unstable and the hardware could not lock on to it. +</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>ERANGE</errorcode></term> + <listitem> + <para>Timings were found, but they are out of range of the hardware +capabilities. +</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-querybuf.xml b/Documentation/DocBook/media/v4l/vidioc-querybuf.xml new file mode 100644 index 00000000000..a597155c052 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-querybuf.xml @@ -0,0 +1,105 @@ +<refentry id="vidioc-querybuf"> + <refmeta> + <refentrytitle>ioctl VIDIOC_QUERYBUF</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_QUERYBUF</refname> + <refpurpose>Query the status of a buffer</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_buffer *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_QUERYBUF</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>This ioctl is part of the <link linkend="mmap">streaming +</link> I/O method. It can be used to query the status of a +buffer at any time after buffers have been allocated with the +&VIDIOC-REQBUFS; ioctl.</para> + + <para>Applications set the <structfield>type</structfield> field + of a &v4l2-buffer; to the same buffer type as was previously used with +&v4l2-format; <structfield>type</structfield> and &v4l2-requestbuffers; +<structfield>type</structfield>, and the <structfield>index</structfield> + field. Valid index numbers range from zero +to the number of buffers allocated with &VIDIOC-REQBUFS; + (&v4l2-requestbuffers; <structfield>count</structfield>) minus one. +The <structfield>reserved</structfield> field should to set to 0. +When using the <link linkend="planar-apis">multi-planar API</link>, the +<structfield>m.planes</structfield> field must contain a userspace pointer to an +array of &v4l2-plane; and the <structfield>length</structfield> field has +to be set to the number of elements in that array. +After calling <constant>VIDIOC_QUERYBUF</constant> with a pointer to + this structure drivers return an error code or fill the rest of +the structure.</para> + + <para>In the <structfield>flags</structfield> field the +<constant>V4L2_BUF_FLAG_MAPPED</constant>, +<constant>V4L2_BUF_FLAG_PREPARED</constant>, +<constant>V4L2_BUF_FLAG_QUEUED</constant> and +<constant>V4L2_BUF_FLAG_DONE</constant> flags will be valid. The +<structfield>memory</structfield> field will be set to the current +I/O method. For the single-planar API, the <structfield>m.offset</structfield> +contains the offset of the buffer from the start of the device memory, +the <structfield>length</structfield> field its size. For the multi-planar API, +fields <structfield>m.mem_offset</structfield> and +<structfield>length</structfield> in the <structfield>m.planes</structfield> +array elements will be used instead and the <structfield>length</structfield> +field of &v4l2-buffer; is set to the number of filled-in array elements. +The driver may or may not set the remaining fields and flags, they are +meaningless in this context.</para> + + <para>The <structname>v4l2_buffer</structname> structure is + specified in <xref linkend="buffer" />.</para> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The buffer <structfield>type</structfield> is not +supported, or the <structfield>index</structfield> is out of bounds.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-querycap.xml b/Documentation/DocBook/media/v4l/vidioc-querycap.xml new file mode 100644 index 00000000000..370d49d6fb6 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-querycap.xml @@ -0,0 +1,338 @@ +<refentry id="vidioc-querycap"> + <refmeta> + <refentrytitle>ioctl VIDIOC_QUERYCAP</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_QUERYCAP</refname> + <refpurpose>Query device capabilities</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_capability *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_QUERYCAP</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>All V4L2 devices support the +<constant>VIDIOC_QUERYCAP</constant> ioctl. It is used to identify +kernel devices compatible with this specification and to obtain +information about driver and hardware capabilities. The ioctl takes a +pointer to a &v4l2-capability; which is filled by the driver. When the +driver is not compatible with this specification the ioctl returns an +&EINVAL;.</para> + + <table pgwide="1" frame="none" id="v4l2-capability"> + <title>struct <structname>v4l2_capability</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u8</entry> + <entry><structfield>driver</structfield>[16]</entry> + <entry><para>Name of the driver, a unique NUL-terminated +ASCII string. For example: "bttv". Driver specific applications can +use this information to verify the driver identity. It is also useful +to work around known bugs, or to identify drivers in error reports.</para> +<para>Storing strings in fixed sized arrays is bad +practice but unavoidable here. Drivers and applications should take +precautions to never read or write beyond the end of the array and to +make sure the strings are properly NUL-terminated.</para></entry> + </row> + <row> + <entry>__u8</entry> + <entry><structfield>card</structfield>[32]</entry> + <entry>Name of the device, a NUL-terminated UTF-8 string. +For example: "Yoyodyne TV/FM". One driver may support different brands +or models of video hardware. This information is intended for users, +for example in a menu of available devices. Since multiple TV cards of +the same brand may be installed which are supported by the same +driver, this name should be combined with the character device file +name (⪚ <filename>/dev/video2</filename>) or the +<structfield>bus_info</structfield> string to avoid +ambiguities.</entry> + </row> + <row> + <entry>__u8</entry> + <entry><structfield>bus_info</structfield>[32]</entry> + <entry>Location of the device in the system, a +NUL-terminated ASCII string. For example: "PCI:0000:05:06.0". This +information is intended for users, to distinguish multiple +identical devices. If no such information is available the field must +simply count the devices controlled by the driver ("platform:vivi-000"). +The bus_info must start with "PCI:" for PCI boards, "PCIe:" for PCI Express boards, +"usb-" for USB devices, "I2C:" for i2c devices, "ISA:" for ISA devices, +"parport" for parallel port devices and "platform:" for platform devices.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>version</structfield></entry> + <entry><para>Version number of the driver.</para> +<para>Starting on kernel 3.1, the version reported is provided per +V4L2 subsystem, following the same Kernel numberation scheme. However, it +should not always return the same version as the kernel, if, for example, +an stable or distribution-modified kernel uses the V4L2 stack from a +newer kernel.</para> +<para>The version number is formatted using the +<constant>KERNEL_VERSION()</constant> macro:</para></entry> + </row> + <row> + <entry spanname="hspan"><para> +<programlisting> +#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c)) + +__u32 version = KERNEL_VERSION(0, 8, 1); + +printf ("Version: %u.%u.%u\n", + (version >> 16) & 0xFF, + (version >> 8) & 0xFF, + version & 0xFF); +</programlisting></para></entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>capabilities</structfield></entry> + <entry>Available capabilities of the physical device as a whole, see <xref + linkend="device-capabilities" />. The same physical device can export + multiple devices in /dev (e.g. /dev/videoX, /dev/vbiY and /dev/radioZ). + The <structfield>capabilities</structfield> field should contain a union + of all capabilities available around the several V4L2 devices exported + to userspace. + For all those devices the <structfield>capabilities</structfield> field + returns the same set of capabilities. This allows applications to open + just one of the devices (typically the video device) and discover whether + video, vbi and/or radio are also supported. + </entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>device_caps</structfield></entry> + <entry>Device capabilities of the opened device, see <xref + linkend="device-capabilities" />. Should contain the available capabilities + of that specific device node. So, for example, <structfield>device_caps</structfield> + of a radio device will only contain radio related capabilities and + no video or vbi capabilities. This field is only set if the <structfield>capabilities</structfield> + field contains the <constant>V4L2_CAP_DEVICE_CAPS</constant> capability. + Only the <structfield>capabilities</structfield> field can have the + <constant>V4L2_CAP_DEVICE_CAPS</constant> capability, <structfield>device_caps</structfield> + will never set <constant>V4L2_CAP_DEVICE_CAPS</constant>. + </entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[3]</entry> + <entry>Reserved for future extensions. Drivers must set +this array to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="device-capabilities"> + <title>Device Capabilities Flags</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_CAP_VIDEO_CAPTURE</constant></entry> + <entry>0x00000001</entry> + <entry>The device supports the single-planar API through the <link +linkend="capture">Video Capture</link> interface.</entry> + </row> + <row> + <entry><constant>V4L2_CAP_VIDEO_CAPTURE_MPLANE</constant></entry> + <entry>0x00001000</entry> + <entry>The device supports the + <link linkend="planar-apis">multi-planar API</link> through the + <link linkend="capture">Video Capture</link> interface.</entry> + </row> + <row> + <entry><constant>V4L2_CAP_VIDEO_OUTPUT</constant></entry> + <entry>0x00000002</entry> + <entry>The device supports the single-planar API through the <link +linkend="output">Video Output</link> interface.</entry> + </row> + <row> + <entry><constant>V4L2_CAP_VIDEO_OUTPUT_MPLANE</constant></entry> + <entry>0x00002000</entry> + <entry>The device supports the + <link linkend="planar-apis">multi-planar API</link> through the + <link linkend="output">Video Output</link> interface.</entry> + </row> + <row> + <entry><constant>V4L2_CAP_VIDEO_M2M</constant></entry> + <entry>0x00004000</entry> + <entry>The device supports the single-planar API through the + Video Memory-To-Memory interface.</entry> + </row> + <row> + <entry><constant>V4L2_CAP_VIDEO_M2M_MPLANE</constant></entry> + <entry>0x00008000</entry> + <entry>The device supports the + <link linkend="planar-apis">multi-planar API</link> through the + Video Memory-To-Memory interface.</entry> + </row> + <row> + <entry><constant>V4L2_CAP_VIDEO_OVERLAY</constant></entry> + <entry>0x00000004</entry> + <entry>The device supports the <link +linkend="overlay">Video Overlay</link> interface. A video overlay device +typically stores captured images directly in the video memory of a +graphics card, with hardware clipping and scaling.</entry> + </row> + <row> + <entry><constant>V4L2_CAP_VBI_CAPTURE</constant></entry> + <entry>0x00000010</entry> + <entry>The device supports the <link linkend="raw-vbi">Raw +VBI Capture</link> interface, providing Teletext and Closed Caption +data.</entry> + </row> + <row> + <entry><constant>V4L2_CAP_VBI_OUTPUT</constant></entry> + <entry>0x00000020</entry> + <entry>The device supports the <link linkend="raw-vbi">Raw VBI Output</link> interface.</entry> + </row> + <row> + <entry><constant>V4L2_CAP_SLICED_VBI_CAPTURE</constant></entry> + <entry>0x00000040</entry> + <entry>The device supports the <link linkend="sliced">Sliced VBI Capture</link> interface.</entry> + </row> + <row> + <entry><constant>V4L2_CAP_SLICED_VBI_OUTPUT</constant></entry> + <entry>0x00000080</entry> + <entry>The device supports the <link linkend="sliced">Sliced VBI Output</link> interface.</entry> + </row> + <row> + <entry><constant>V4L2_CAP_RDS_CAPTURE</constant></entry> + <entry>0x00000100</entry> + <entry>The device supports the <link linkend="rds">RDS</link> capture interface.</entry> + </row> + <row> + <entry><constant>V4L2_CAP_VIDEO_OUTPUT_OVERLAY</constant></entry> + <entry>0x00000200</entry> + <entry>The device supports the <link linkend="osd">Video +Output Overlay</link> (OSD) interface. Unlike the <wordasword>Video +Overlay</wordasword> interface, this is a secondary function of video +output devices and overlays an image onto an outgoing video signal. +When the driver sets this flag, it must clear the +<constant>V4L2_CAP_VIDEO_OVERLAY</constant> flag and vice +versa.<footnote><para>The &v4l2-framebuffer; lacks an +&v4l2-buf-type; field, therefore the type of overlay is implied by the +driver capabilities.</para></footnote></entry> + </row> + <row> + <entry><constant>V4L2_CAP_HW_FREQ_SEEK</constant></entry> + <entry>0x00000400</entry> + <entry>The device supports the &VIDIOC-S-HW-FREQ-SEEK; ioctl for +hardware frequency seeking.</entry> + </row> + <row> + <entry><constant>V4L2_CAP_RDS_OUTPUT</constant></entry> + <entry>0x00000800</entry> + <entry>The device supports the <link linkend="rds">RDS</link> output interface.</entry> + </row> + <row> + <entry><constant>V4L2_CAP_TUNER</constant></entry> + <entry>0x00010000</entry> + <entry>The device has some sort of tuner to +receive RF-modulated video signals. For more information about +tuner programming see +<xref linkend="tuner" />.</entry> + </row> + <row> + <entry><constant>V4L2_CAP_AUDIO</constant></entry> + <entry>0x00020000</entry> + <entry>The device has audio inputs or outputs. It may or +may not support audio recording or playback, in PCM or compressed +formats. PCM audio support must be implemented as ALSA or OSS +interface. For more information on audio inputs and outputs see <xref + linkend="audio" />.</entry> + </row> + <row> + <entry><constant>V4L2_CAP_RADIO</constant></entry> + <entry>0x00040000</entry> + <entry>This is a radio receiver.</entry> + </row> + <row> + <entry><constant>V4L2_CAP_MODULATOR</constant></entry> + <entry>0x00080000</entry> + <entry>The device has some sort of modulator to +emit RF-modulated video/audio signals. For more information about +modulator programming see +<xref linkend="tuner" />.</entry> + </row> + <row> + <entry><constant>V4L2_CAP_SDR_CAPTURE</constant></entry> + <entry>0x00100000</entry> + <entry>The device supports the +<link linkend="sdr">SDR Capture</link> interface.</entry> + </row> + <row> + <entry><constant>V4L2_CAP_READWRITE</constant></entry> + <entry>0x01000000</entry> + <entry>The device supports the <link +linkend="rw">read()</link> and/or <link linkend="rw">write()</link> +I/O methods.</entry> + </row> + <row> + <entry><constant>V4L2_CAP_ASYNCIO</constant></entry> + <entry>0x02000000</entry> + <entry>The device supports the <link +linkend="async">asynchronous</link> I/O methods.</entry> + </row> + <row> + <entry><constant>V4L2_CAP_STREAMING</constant></entry> + <entry>0x04000000</entry> + <entry>The device supports the <link +linkend="mmap">streaming</link> I/O method.</entry> + </row> + <row> + <entry><constant>V4L2_CAP_DEVICE_CAPS</constant></entry> + <entry>0x80000000</entry> + <entry>The driver fills the <structfield>device_caps</structfield> + field. This capability can only appear in the <structfield>capabilities</structfield> + field and never in the <structfield>device_caps</structfield> field.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-queryctrl.xml b/Documentation/DocBook/media/v4l/vidioc-queryctrl.xml new file mode 100644 index 00000000000..e6645b99655 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-queryctrl.xml @@ -0,0 +1,480 @@ +<refentry id="vidioc-queryctrl"> + <refmeta> + <refentrytitle>ioctl VIDIOC_QUERYCTRL, VIDIOC_QUERYMENU</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_QUERYCTRL</refname> + <refname>VIDIOC_QUERYMENU</refname> + <refpurpose>Enumerate controls and menu control items</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_queryctrl *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_querymenu *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_QUERYCTRL, VIDIOC_QUERYMENU</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>To query the attributes of a control applications set the +<structfield>id</structfield> field of a &v4l2-queryctrl; and call the +<constant>VIDIOC_QUERYCTRL</constant> ioctl with a pointer to this +structure. The driver fills the rest of the structure or returns an +&EINVAL; when the <structfield>id</structfield> is invalid.</para> + + <para>It is possible to enumerate controls by calling +<constant>VIDIOC_QUERYCTRL</constant> with successive +<structfield>id</structfield> values starting from +<constant>V4L2_CID_BASE</constant> up to and exclusive +<constant>V4L2_CID_BASE_LASTP1</constant>. Drivers may return +<errorcode>EINVAL</errorcode> if a control in this range is not +supported. Further applications can enumerate private controls, which +are not defined in this specification, by starting at +<constant>V4L2_CID_PRIVATE_BASE</constant> and incrementing +<structfield>id</structfield> until the driver returns +<errorcode>EINVAL</errorcode>.</para> + + <para>In both cases, when the driver sets the +<constant>V4L2_CTRL_FLAG_DISABLED</constant> flag in the +<structfield>flags</structfield> field this control is permanently +disabled and should be ignored by the application.<footnote> + <para><constant>V4L2_CTRL_FLAG_DISABLED</constant> was +intended for two purposes: Drivers can skip predefined controls not +supported by the hardware (although returning EINVAL would do as +well), or disable predefined and private controls after hardware +detection without the trouble of reordering control arrays and indices +(EINVAL cannot be used to skip private controls because it would +prematurely end the enumeration).</para></footnote></para> + + <para>When the application ORs <structfield>id</structfield> with +<constant>V4L2_CTRL_FLAG_NEXT_CTRL</constant> the driver returns the +next supported control, or <errorcode>EINVAL</errorcode> if there is +none. Drivers which do not support this flag yet always return +<errorcode>EINVAL</errorcode>.</para> + + <para>Additional information is required for menu controls: the +names of the menu items. To query them applications set the +<structfield>id</structfield> and <structfield>index</structfield> +fields of &v4l2-querymenu; and call the +<constant>VIDIOC_QUERYMENU</constant> ioctl with a pointer to this +structure. The driver fills the rest of the structure or returns an +&EINVAL; when the <structfield>id</structfield> or +<structfield>index</structfield> is invalid. Menu items are enumerated +by calling <constant>VIDIOC_QUERYMENU</constant> with successive +<structfield>index</structfield> values from &v4l2-queryctrl; +<structfield>minimum</structfield> to +<structfield>maximum</structfield>, inclusive. Note that it is possible +for <constant>VIDIOC_QUERYMENU</constant> to return an &EINVAL; for some +indices between <structfield>minimum</structfield> and <structfield>maximum</structfield>. +In that case that particular menu item is not supported by this driver. Also note that +the <structfield>minimum</structfield> value is not necessarily 0.</para> + + <para>See also the examples in <xref linkend="control" />.</para> + + <table pgwide="1" frame="none" id="v4l2-queryctrl"> + <title>struct <structname>v4l2_queryctrl</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>id</structfield></entry> + <entry>Identifies the control, set by the application. See +<xref linkend="control-id" /> for predefined IDs. When the ID is ORed +with V4L2_CTRL_FLAG_NEXT_CTRL the driver clears the flag and returns +the first control with a higher ID. Drivers which do not support this +flag yet always return an &EINVAL;.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>type</structfield></entry> + <entry>Type of control, see <xref + linkend="v4l2-ctrl-type" />.</entry> + </row> + <row> + <entry>__u8</entry> + <entry><structfield>name</structfield>[32]</entry> + <entry>Name of the control, a NUL-terminated ASCII +string. This information is intended for the user.</entry> + </row> + <row> + <entry>__s32</entry> + <entry><structfield>minimum</structfield></entry> + <entry>Minimum value, inclusive. This field gives a lower +bound for <constant>V4L2_CTRL_TYPE_INTEGER</constant> controls and the +lowest valid index for <constant>V4L2_CTRL_TYPE_MENU</constant> controls. +For <constant>V4L2_CTRL_TYPE_STRING</constant> controls the minimum value +gives the minimum length of the string. This length <emphasis>does not include the terminating +zero</emphasis>. It may not be valid for any other type of control, including +<constant>V4L2_CTRL_TYPE_INTEGER64</constant> controls. Note that this is a +signed value.</entry> + </row> + <row> + <entry>__s32</entry> + <entry><structfield>maximum</structfield></entry> + <entry>Maximum value, inclusive. This field gives an upper +bound for <constant>V4L2_CTRL_TYPE_INTEGER</constant> controls and the +highest valid index for <constant>V4L2_CTRL_TYPE_MENU</constant> +controls. For <constant>V4L2_CTRL_TYPE_BITMASK</constant> controls it is the +set of usable bits. +For <constant>V4L2_CTRL_TYPE_STRING</constant> controls the maximum value +gives the maximum length of the string. This length <emphasis>does not include the terminating +zero</emphasis>. It may not be valid for any other type of control, including +<constant>V4L2_CTRL_TYPE_INTEGER64</constant> controls. Note that this is a +signed value.</entry> + </row> + <row> + <entry>__s32</entry> + <entry><structfield>step</structfield></entry> + <entry><para>This field gives a step size for +<constant>V4L2_CTRL_TYPE_INTEGER</constant> controls. For +<constant>V4L2_CTRL_TYPE_STRING</constant> controls this field refers to +the string length that has to be a multiple of this step size. +It may not be valid for any other type of control, including +<constant>V4L2_CTRL_TYPE_INTEGER64</constant> +controls.</para><para>Generally drivers should not scale hardware +control values. It may be necessary for example when the +<structfield>name</structfield> or <structfield>id</structfield> imply +a particular unit and the hardware actually accepts only multiples of +said unit. If so, drivers must take care values are properly rounded +when scaling, such that errors will not accumulate on repeated +read-write cycles.</para><para>This field gives the smallest change of +an integer control actually affecting hardware. Often the information +is needed when the user can change controls by keyboard or GUI +buttons, rather than a slider. When for example a hardware register +accepts values 0-511 and the driver reports 0-65535, step should be +128.</para><para>Note that although signed, the step value is supposed to +be always positive.</para></entry> + </row> + <row> + <entry>__s32</entry> + <entry><structfield>default_value</structfield></entry> + <entry>The default value of a +<constant>V4L2_CTRL_TYPE_INTEGER</constant>, +<constant>_BOOLEAN</constant> or <constant>_MENU</constant> control. +Not valid for other types of controls. Drivers reset controls only +when the driver is loaded, not later, in particular not when the +func-open; is called.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>flags</structfield></entry> + <entry>Control flags, see <xref + linkend="control-flags" />.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[2]</entry> + <entry>Reserved for future extensions. Drivers must set +the array to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="v4l2-querymenu"> + <title>struct <structname>v4l2_querymenu</structname></title> + <tgroup cols="4"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry></entry> + <entry><structfield>id</structfield></entry> + <entry>Identifies the control, set by the application +from the respective &v4l2-queryctrl; +<structfield>id</structfield>.</entry> + </row> + <row> + <entry>__u32</entry> + <entry></entry> + <entry><structfield>index</structfield></entry> + <entry>Index of the menu item, starting at zero, set by + the application.</entry> + </row> + <row> + <entry>union</entry> + <entry></entry> + <entry></entry> + <entry></entry> + </row> + <row> + <entry></entry> + <entry>__u8</entry> + <entry><structfield>name</structfield>[32]</entry> + <entry>Name of the menu item, a NUL-terminated ASCII +string. This information is intended for the user. This field is valid +for <constant>V4L2_CTRL_FLAG_MENU</constant> type controls.</entry> + </row> + <row> + <entry></entry> + <entry>__s64</entry> + <entry><structfield>value</structfield></entry> + <entry> + Value of the integer menu item. This field is valid for + <constant>V4L2_CTRL_FLAG_INTEGER_MENU</constant> type + controls. + </entry> + </row> + <row> + <entry>__u32</entry> + <entry></entry> + <entry><structfield>reserved</structfield></entry> + <entry>Reserved for future extensions. Drivers must set +the array to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="v4l2-ctrl-type"> + <title>enum v4l2_ctrl_type</title> + <tgroup cols="5" align="left"> + <colspec colwidth="30*" /> + <colspec colwidth="5*" align="center" /> + <colspec colwidth="5*" align="center" /> + <colspec colwidth="5*" align="center" /> + <colspec colwidth="55*" /> + <thead> + <row> + <entry>Type</entry> + <entry><structfield>minimum</structfield></entry> + <entry><structfield>step</structfield></entry> + <entry><structfield>maximum</structfield></entry> + <entry>Description</entry> + </row> + </thead> + <tbody valign="top"> + <row> + <entry><constant>V4L2_CTRL_TYPE_INTEGER</constant></entry> + <entry>any</entry> + <entry>any</entry> + <entry>any</entry> + <entry>An integer-valued control ranging from minimum to +maximum inclusive. The step value indicates the increment between +values which are actually different on the hardware.</entry> + </row> + <row> + <entry><constant>V4L2_CTRL_TYPE_BOOLEAN</constant></entry> + <entry>0</entry> + <entry>1</entry> + <entry>1</entry> + <entry>A boolean-valued control. Zero corresponds to +"disabled", and one means "enabled".</entry> + </row> + <row> + <entry><constant>V4L2_CTRL_TYPE_MENU</constant></entry> + <entry>≥ 0</entry> + <entry>1</entry> + <entry>N-1</entry> + <entry>The control has a menu of N choices. The names of +the menu items can be enumerated with the +<constant>VIDIOC_QUERYMENU</constant> ioctl.</entry> + </row> + <row> + <entry><constant>V4L2_CTRL_TYPE_INTEGER_MENU</constant></entry> + <entry>≥ 0</entry> + <entry>1</entry> + <entry>N-1</entry> + <entry> + The control has a menu of N choices. The values of the + menu items can be enumerated with the + <constant>VIDIOC_QUERYMENU</constant> ioctl. This is + similar to <constant>V4L2_CTRL_TYPE_MENU</constant> + except that instead of strings, the menu items are + signed 64-bit integers. + </entry> + </row> + <row> + <entry><constant>V4L2_CTRL_TYPE_BITMASK</constant></entry> + <entry>0</entry> + <entry>n/a</entry> + <entry>any</entry> + <entry>A bitmask field. The maximum value is the set of bits that can +be used, all other bits are to be 0. The maximum value is interpreted as a __u32, +allowing the use of bit 31 in the bitmask.</entry> + </row> + <row> + <entry><constant>V4L2_CTRL_TYPE_BUTTON</constant></entry> + <entry>0</entry> + <entry>0</entry> + <entry>0</entry> + <entry>A control which performs an action when set. +Drivers must ignore the value passed with +<constant>VIDIOC_S_CTRL</constant> and return an &EINVAL; on a +<constant>VIDIOC_G_CTRL</constant> attempt.</entry> + </row> + <row> + <entry><constant>V4L2_CTRL_TYPE_INTEGER64</constant></entry> + <entry>n/a</entry> + <entry>n/a</entry> + <entry>n/a</entry> + <entry>A 64-bit integer valued control. Minimum, maximum +and step size cannot be queried.</entry> + </row> + <row> + <entry><constant>V4L2_CTRL_TYPE_STRING</constant></entry> + <entry>≥ 0</entry> + <entry>≥ 1</entry> + <entry>≥ 0</entry> + <entry>The minimum and maximum string lengths. The step size +means that the string must be (minimum + N * step) characters long for +N ≥ 0. These lengths do not include the terminating zero, so in order to +pass a string of length 8 to &VIDIOC-S-EXT-CTRLS; you need to set the +<structfield>size</structfield> field of &v4l2-ext-control; to 9. For &VIDIOC-G-EXT-CTRLS; you can +set the <structfield>size</structfield> field to <structfield>maximum</structfield> + 1. +Which character encoding is used will depend on the string control itself and +should be part of the control documentation.</entry> + </row> + <row> + <entry><constant>V4L2_CTRL_TYPE_CTRL_CLASS</constant></entry> + <entry>n/a</entry> + <entry>n/a</entry> + <entry>n/a</entry> + <entry>This is not a control. When +<constant>VIDIOC_QUERYCTRL</constant> is called with a control ID +equal to a control class code (see <xref linkend="ctrl-class" />) + 1, the +ioctl returns the name of the control class and this control type. +Older drivers which do not support this feature return an +&EINVAL;.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="control-flags"> + <title>Control Flags</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_CTRL_FLAG_DISABLED</constant></entry> + <entry>0x0001</entry> + <entry>This control is permanently disabled and should be +ignored by the application. Any attempt to change the control will +result in an &EINVAL;.</entry> + </row> + <row> + <entry><constant>V4L2_CTRL_FLAG_GRABBED</constant></entry> + <entry>0x0002</entry> + <entry>This control is temporarily unchangeable, for +example because another application took over control of the +respective resource. Such controls may be displayed specially in a +user interface. Attempts to change the control may result in an +&EBUSY;.</entry> + </row> + <row> + <entry><constant>V4L2_CTRL_FLAG_READ_ONLY</constant></entry> + <entry>0x0004</entry> + <entry>This control is permanently readable only. Any +attempt to change the control will result in an &EINVAL;.</entry> + </row> + <row> + <entry><constant>V4L2_CTRL_FLAG_UPDATE</constant></entry> + <entry>0x0008</entry> + <entry>A hint that changing this control may affect the +value of other controls within the same control class. Applications +should update their user interface accordingly.</entry> + </row> + <row> + <entry><constant>V4L2_CTRL_FLAG_INACTIVE</constant></entry> + <entry>0x0010</entry> + <entry>This control is not applicable to the current +configuration and should be displayed accordingly in a user interface. +For example the flag may be set on a MPEG audio level 2 bitrate +control when MPEG audio encoding level 1 was selected with another +control.</entry> + </row> + <row> + <entry><constant>V4L2_CTRL_FLAG_SLIDER</constant></entry> + <entry>0x0020</entry> + <entry>A hint that this control is best represented as a +slider-like element in a user interface.</entry> + </row> + <row> + <entry><constant>V4L2_CTRL_FLAG_WRITE_ONLY</constant></entry> + <entry>0x0040</entry> + <entry>This control is permanently writable only. Any +attempt to read the control will result in an &EACCES; error code. This +flag is typically present for relative controls or action controls where +writing a value will cause the device to carry out a given action +(⪚ motor control) but no meaningful value can be returned.</entry> + </row> + <row> + <entry><constant>V4L2_CTRL_FLAG_VOLATILE</constant></entry> + <entry>0x0080</entry> + <entry>This control is volatile, which means that the value of the control +changes continuously. A typical example would be the current gain value if the device +is in auto-gain mode. In such a case the hardware calculates the gain value based on +the lighting conditions which can change over time. Note that setting a new value for +a volatile control will have no effect. The new value will just be ignored.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The &v4l2-queryctrl; <structfield>id</structfield> +is invalid. The &v4l2-querymenu; <structfield>id</structfield> is +invalid or <structfield>index</structfield> is out of range (less than +<structfield>minimum</structfield> or greater than <structfield>maximum</structfield>) +or this particular menu item is not supported by the driver.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EACCES</errorcode></term> + <listitem> + <para>An attempt was made to read a write-only control.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-querystd.xml b/Documentation/DocBook/media/v4l/vidioc-querystd.xml new file mode 100644 index 00000000000..22234854218 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-querystd.xml @@ -0,0 +1,75 @@ +<refentry id="vidioc-querystd"> + <refmeta> + <refentrytitle>ioctl VIDIOC_QUERYSTD</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_QUERYSTD</refname> + <refpurpose>Sense the video standard received by the current +input</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>v4l2_std_id *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_QUERYSTD</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>The hardware may be able to detect the current video +standard automatically. To do so, applications call <constant> +VIDIOC_QUERYSTD</constant> with a pointer to a &v4l2-std-id; type. The +driver stores here a set of candidates, this can be a single flag or a +set of supported standards if for example the hardware can only +distinguish between 50 and 60 Hz systems. If no signal was detected, +then the driver will return V4L2_STD_UNKNOWN. When detection is not +possible or fails, the set must contain all standards supported by the +current video input or output.</para> + + </refsect1> + + <refsect1> + &return-value; + <variablelist> + <varlistentry> + <term><errorcode>ENODATA</errorcode></term> + <listitem> + <para>Standard video timings are not supported for this input or output.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-reqbufs.xml b/Documentation/DocBook/media/v4l/vidioc-reqbufs.xml new file mode 100644 index 00000000000..78a06a9a5ec --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-reqbufs.xml @@ -0,0 +1,137 @@ +<refentry id="vidioc-reqbufs"> + <refmeta> + <refentrytitle>ioctl VIDIOC_REQBUFS</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_REQBUFS</refname> + <refpurpose>Initiate Memory Mapping or User Pointer I/O</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_requestbuffers *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_REQBUFS</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + +<para>This ioctl is used to initiate <link linkend="mmap">memory mapped</link>, +<link linkend="userp">user pointer</link> or <link +linkend="dmabuf">DMABUF</link> based I/O. Memory mapped buffers are located in +device memory and must be allocated with this ioctl before they can be mapped +into the application's address space. User buffers are allocated by +applications themselves, and this ioctl is merely used to switch the driver +into user pointer I/O mode and to setup some internal structures. +Similarly, DMABUF buffers are allocated by applications through a device +driver, and this ioctl only configures the driver into DMABUF I/O mode without +performing any direct allocation.</para> + + <para>To allocate device buffers applications initialize all fields of the +<structname>v4l2_requestbuffers</structname> structure. They set the +<structfield>type</structfield> field to the respective stream or buffer type, +the <structfield>count</structfield> field to the desired number of buffers, +<structfield>memory</structfield> must be set to the requested I/O method and +the <structfield>reserved</structfield> array must be zeroed. When the ioctl is +called with a pointer to this structure the driver will attempt to allocate the +requested number of buffers and it stores the actual number allocated in the +<structfield>count</structfield> field. It can be smaller than the number +requested, even zero, when the driver runs out of free memory. A larger number +is also possible when the driver requires more buffers to function correctly. +For example video output requires at least two buffers, one displayed and one +filled by the application.</para> + <para>When the I/O method is not supported the ioctl +returns an &EINVAL;.</para> + + <para>Applications can call <constant>VIDIOC_REQBUFS</constant> +again to change the number of buffers, however this cannot succeed +when any buffers are still mapped. A <structfield>count</structfield> +value of zero frees all buffers, after aborting or finishing any DMA +in progress, an implicit &VIDIOC-STREAMOFF;. <!-- mhs: I see no +reason why munmap()ping one or even all buffers must imply +streamoff.--></para> + + <table pgwide="1" frame="none" id="v4l2-requestbuffers"> + <title>struct <structname>v4l2_requestbuffers</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>count</structfield></entry> + <entry>The number of buffers requested or granted.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>type</structfield></entry> + <entry>Type of the stream or buffers, this is the same +as the &v4l2-format; <structfield>type</structfield> field. See <xref + linkend="v4l2-buf-type" /> for valid values.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>memory</structfield></entry> + <entry>Applications set this field to +<constant>V4L2_MEMORY_MMAP</constant>, +<constant>V4L2_MEMORY_DMABUF</constant> or +<constant>V4L2_MEMORY_USERPTR</constant>. See <xref linkend="v4l2-memory" +/>.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[2]</entry> + <entry>A place holder for future extensions. This array should +be zeroed by applications.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The buffer type (<structfield>type</structfield> field) or the +requested I/O method (<structfield>memory</structfield>) is not +supported.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-s-hw-freq-seek.xml b/Documentation/DocBook/media/v4l/vidioc-s-hw-freq-seek.xml new file mode 100644 index 00000000000..a5fc4c4880f --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-s-hw-freq-seek.xml @@ -0,0 +1,188 @@ +<refentry id="vidioc-s-hw-freq-seek"> + <refmeta> + <refentrytitle>ioctl VIDIOC_S_HW_FREQ_SEEK</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_S_HW_FREQ_SEEK</refname> + <refpurpose>Perform a hardware frequency seek</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_hw_freq_seek +*<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_S_HW_FREQ_SEEK</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>Start a hardware frequency seek from the current frequency. +To do this applications initialize the <structfield>tuner</structfield>, +<structfield>type</structfield>, <structfield>seek_upward</structfield>, +<structfield>wrap_around</structfield>, <structfield>spacing</structfield>, +<structfield>rangelow</structfield> and <structfield>rangehigh</structfield> +fields, and zero out the <structfield>reserved</structfield> array of a +&v4l2-hw-freq-seek; and call the <constant>VIDIOC_S_HW_FREQ_SEEK</constant> +ioctl with a pointer to this structure.</para> + + <para>The <structfield>rangelow</structfield> and +<structfield>rangehigh</structfield> fields can be set to a non-zero value to +tell the driver to search a specific band. If the &v4l2-tuner; +<structfield>capability</structfield> field has the +<constant>V4L2_TUNER_CAP_HWSEEK_PROG_LIM</constant> flag set, these values +must fall within one of the bands returned by &VIDIOC-ENUM-FREQ-BANDS;. If +the <constant>V4L2_TUNER_CAP_HWSEEK_PROG_LIM</constant> flag is not set, +then these values must exactly match those of one of the bands returned by +&VIDIOC-ENUM-FREQ-BANDS;. If the current frequency of the tuner does not fall +within the selected band it will be clamped to fit in the band before the +seek is started.</para> + + <para>If an error is returned, then the original frequency will + be restored.</para> + + <para>This ioctl is supported if the <constant>V4L2_CAP_HW_FREQ_SEEK</constant> capability is set.</para> + + <para>If this ioctl is called from a non-blocking filehandle, then &EAGAIN; is + returned and no seek takes place.</para> + + <table pgwide="1" frame="none" id="v4l2-hw-freq-seek"> + <title>struct <structname>v4l2_hw_freq_seek</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>tuner</structfield></entry> + <entry>The tuner index number. This is the +same value as in the &v4l2-input; <structfield>tuner</structfield> +field and the &v4l2-tuner; <structfield>index</structfield> field.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>type</structfield></entry> + <entry>The tuner type. This is the same value as in the +&v4l2-tuner; <structfield>type</structfield> field. See <xref + linkend="v4l2-tuner-type" /></entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>seek_upward</structfield></entry> + <entry>If non-zero, seek upward from the current frequency, else seek downward.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>wrap_around</structfield></entry> + <entry>If non-zero, wrap around when at the end of the frequency range, else stop seeking. + The &v4l2-tuner; <structfield>capability</structfield> field will tell you what the + hardware supports. + </entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>spacing</structfield></entry> + <entry>If non-zero, defines the hardware seek resolution in Hz. The driver selects the nearest value that is supported by the device. If spacing is zero a reasonable default value is used.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>rangelow</structfield></entry> + <entry>If non-zero, the lowest tunable frequency of the band to +search in units of 62.5 kHz, or if the &v4l2-tuner; +<structfield>capability</structfield> field has the +<constant>V4L2_TUNER_CAP_LOW</constant> flag set, in units of 62.5 Hz or if the &v4l2-tuner; +<structfield>capability</structfield> field has the +<constant>V4L2_TUNER_CAP_1HZ</constant> flag set, in units of 1 Hz. +If <structfield>rangelow</structfield> is zero a reasonable default value +is used.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>rangehigh</structfield></entry> + <entry>If non-zero, the highest tunable frequency of the band to +search in units of 62.5 kHz, or if the &v4l2-tuner; +<structfield>capability</structfield> field has the +<constant>V4L2_TUNER_CAP_LOW</constant> flag set, in units of 62.5 Hz or if the &v4l2-tuner; +<structfield>capability</structfield> field has the +<constant>V4L2_TUNER_CAP_1HZ</constant> flag set, in units of 1 Hz. +If <structfield>rangehigh</structfield> is zero a reasonable default value +is used.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[5]</entry> + <entry>Reserved for future extensions. Applications + must set the array to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The <structfield>tuner</structfield> index is out of +bounds, the <structfield>wrap_around</structfield> value is not supported or +one of the values in the <structfield>type</structfield>, +<structfield>rangelow</structfield> or <structfield>rangehigh</structfield> +fields is wrong.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EAGAIN</errorcode></term> + <listitem> + <para>Attempted to call <constant>VIDIOC_S_HW_FREQ_SEEK</constant> + with the filehandle in non-blocking mode.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>ENODATA</errorcode></term> + <listitem> + <para>The hardware seek found no channels.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EBUSY</errorcode></term> + <listitem> + <para>Another hardware seek is already in progress.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-streamon.xml b/Documentation/DocBook/media/v4l/vidioc-streamon.xml new file mode 100644 index 00000000000..df2c63d07ba --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-streamon.xml @@ -0,0 +1,128 @@ +<refentry id="vidioc-streamon"> + <refmeta> + <refentrytitle>ioctl VIDIOC_STREAMON, VIDIOC_STREAMOFF</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_STREAMON</refname> + <refname>VIDIOC_STREAMOFF</refname> + <refpurpose>Start or stop streaming I/O</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>const int *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_STREAMON, VIDIOC_STREAMOFF</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>The <constant>VIDIOC_STREAMON</constant> and +<constant>VIDIOC_STREAMOFF</constant> ioctl start and stop the capture +or output process during streaming (<link linkend="mmap">memory +mapping</link>, <link linkend="userp">user pointer</link> or +<link linkend="dmabuf">DMABUF</link>) I/O.</para> + + <para>Capture hardware is disabled and no input +buffers are filled (if there are any empty buffers in the incoming +queue) until <constant>VIDIOC_STREAMON</constant> has been called. +Output hardware is disabled and no video signal is +produced until <constant>VIDIOC_STREAMON</constant> has been called. +The ioctl will succeed when at least one output buffer is in the +incoming queue.</para> + + <para>Memory-to-memory devices will not start until +<constant>VIDIOC_STREAMON</constant> has been called for both the capture +and output stream types.</para> + + <para>If <constant>VIDIOC_STREAMON</constant> fails then any already +queued buffers will remain queued.</para> + + <para>The <constant>VIDIOC_STREAMOFF</constant> ioctl, apart of +aborting or finishing any DMA in progress, unlocks any user pointer +buffers locked in physical memory, and it removes all buffers from the +incoming and outgoing queues. That means all images captured but not +dequeued yet will be lost, likewise all images enqueued for output but +not transmitted yet. I/O returns to the same state as after calling +&VIDIOC-REQBUFS; and can be restarted accordingly.</para> + + <para>If buffers have been queued with &VIDIOC-QBUF; and +<constant>VIDIOC_STREAMOFF</constant> is called without ever having +called <constant>VIDIOC_STREAMON</constant>, then those queued buffers +will also be removed from the incoming queue and all are returned to the +same state as after calling &VIDIOC-REQBUFS; and can be restarted +accordingly.</para> + + <para>Both ioctls take a pointer to an integer, the desired buffer or +stream type. This is the same as &v4l2-requestbuffers; +<structfield>type</structfield>.</para> + + <para>If <constant>VIDIOC_STREAMON</constant> is called when streaming +is already in progress, or if <constant>VIDIOC_STREAMOFF</constant> is called +when streaming is already stopped, then 0 is returned. Nothing happens in the +case of <constant>VIDIOC_STREAMON</constant>, but <constant>VIDIOC_STREAMOFF</constant> +will return queued buffers to their starting state as mentioned above.</para> + + <para>Note that applications can be preempted for unknown periods right +before or after the <constant>VIDIOC_STREAMON</constant> or +<constant>VIDIOC_STREAMOFF</constant> calls, there is no notion of +starting or stopping "now". Buffer timestamps can be used to +synchronize with other events.</para> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The buffer <structfield>type</structfield> is not supported, + or no buffers have been allocated (memory mapping) or enqueued + (output) yet.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EPIPE</errorcode></term> + <listitem> + <para>The driver implements <link + linkend="pad-level-formats">pad-level format configuration</link> and + the pipeline configuration is invalid. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-subdev-enum-frame-interval.xml b/Documentation/DocBook/media/v4l/vidioc-subdev-enum-frame-interval.xml new file mode 100644 index 00000000000..2f8f4f0a023 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-subdev-enum-frame-interval.xml @@ -0,0 +1,152 @@ +<refentry id="vidioc-subdev-enum-frame-interval"> + <refmeta> + <refentrytitle>ioctl VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL</refname> + <refpurpose>Enumerate frame intervals</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_subdev_frame_interval_enum * + <parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <note> + <title>Experimental</title> + <para>This is an <link linkend="experimental">experimental</link> + interface and may change in the future.</para> + </note> + + <para>This ioctl lets applications enumerate available frame intervals on a + given sub-device pad. Frame intervals only makes sense for sub-devices that + can control the frame period on their own. This includes, for instance, + image sensors and TV tuners.</para> + + <para>For the common use case of image sensors, the frame intervals + available on the sub-device output pad depend on the frame format and size + on the same pad. Applications must thus specify the desired format and size + when enumerating frame intervals.</para> + + <para>To enumerate frame intervals applications initialize the + <structfield>index</structfield>, <structfield>pad</structfield>, + <structfield>code</structfield>, <structfield>width</structfield> and + <structfield>height</structfield> fields of + &v4l2-subdev-frame-interval-enum; and call the + <constant>VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL</constant> ioctl with a pointer + to this structure. Drivers fill the rest of the structure or return + an &EINVAL; if one of the input fields is invalid. All frame intervals are + enumerable by beginning at index zero and incrementing by one until + <errorcode>EINVAL</errorcode> is returned.</para> + + <para>Available frame intervals may depend on the current 'try' formats + at other pads of the sub-device, as well as on the current active links. See + &VIDIOC-SUBDEV-G-FMT; for more information about the try formats.</para> + + <para>Sub-devices that support the frame interval enumeration ioctl should + implemented it on a single pad only. Its behaviour when supported on + multiple pads of the same sub-device is not defined.</para> + + <table pgwide="1" frame="none" id="v4l2-subdev-frame-interval-enum"> + <title>struct <structname>v4l2_subdev_frame_interval_enum</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>index</structfield></entry> + <entry>Number of the format in the enumeration, set by the + application.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>pad</structfield></entry> + <entry>Pad number as reported by the media controller API.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>code</structfield></entry> + <entry>The media bus format code, as defined in + <xref linkend="v4l2-mbus-format" />.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>width</structfield></entry> + <entry>Frame width, in pixels.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>height</structfield></entry> + <entry>Frame height, in pixels.</entry> + </row> + <row> + <entry>&v4l2-fract;</entry> + <entry><structfield>interval</structfield></entry> + <entry>Period, in seconds, between consecutive video frames.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[9]</entry> + <entry>Reserved for future extensions. Applications and drivers must + set the array to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The &v4l2-subdev-frame-interval-enum; + <structfield>pad</structfield> references a non-existing pad, one of + the <structfield>code</structfield>, <structfield>width</structfield> + or <structfield>height</structfield> fields are invalid for the given + pad or the <structfield>index</structfield> field is out of bounds. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-subdev-enum-frame-size.xml b/Documentation/DocBook/media/v4l/vidioc-subdev-enum-frame-size.xml new file mode 100644 index 00000000000..79ce42b7c60 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-subdev-enum-frame-size.xml @@ -0,0 +1,154 @@ +<refentry id="vidioc-subdev-enum-frame-size"> + <refmeta> + <refentrytitle>ioctl VIDIOC_SUBDEV_ENUM_FRAME_SIZE</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_SUBDEV_ENUM_FRAME_SIZE</refname> + <refpurpose>Enumerate media bus frame sizes</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_subdev_frame_size_enum * + <parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_SUBDEV_ENUM_FRAME_SIZE</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <note> + <title>Experimental</title> + <para>This is an <link linkend="experimental">experimental</link> + interface and may change in the future.</para> + </note> + + <para>This ioctl allows applications to enumerate all frame sizes + supported by a sub-device on the given pad for the given media bus format. + Supported formats can be retrieved with the &VIDIOC-SUBDEV-ENUM-MBUS-CODE; + ioctl.</para> + + <para>To enumerate frame sizes applications initialize the + <structfield>pad</structfield>, <structfield>code</structfield> and + <structfield>index</structfield> fields of the + &v4l2-subdev-mbus-code-enum; and call the + <constant>VIDIOC_SUBDEV_ENUM_FRAME_SIZE</constant> ioctl with a pointer to + the structure. Drivers fill the minimum and maximum frame sizes or return + an &EINVAL; if one of the input parameters is invalid.</para> + + <para>Sub-devices that only support discrete frame sizes (such as most + sensors) will return one or more frame sizes with identical minimum and + maximum values.</para> + + <para>Not all possible sizes in given [minimum, maximum] ranges need to be + supported. For instance, a scaler that uses a fixed-point scaling ratio + might not be able to produce every frame size between the minimum and + maximum values. Applications must use the &VIDIOC-SUBDEV-S-FMT; ioctl to + try the sub-device for an exact supported frame size.</para> + + <para>Available frame sizes may depend on the current 'try' formats at other + pads of the sub-device, as well as on the current active links and the + current values of V4L2 controls. See &VIDIOC-SUBDEV-G-FMT; for more + information about try formats.</para> + + <table pgwide="1" frame="none" id="v4l2-subdev-frame-size-enum"> + <title>struct <structname>v4l2_subdev_frame_size_enum</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>index</structfield></entry> + <entry>Number of the format in the enumeration, set by the + application.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>pad</structfield></entry> + <entry>Pad number as reported by the media controller API.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>code</structfield></entry> + <entry>The media bus format code, as defined in + <xref linkend="v4l2-mbus-format" />.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>min_width</structfield></entry> + <entry>Minimum frame width, in pixels.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>max_width</structfield></entry> + <entry>Maximum frame width, in pixels.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>min_height</structfield></entry> + <entry>Minimum frame height, in pixels.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>max_height</structfield></entry> + <entry>Maximum frame height, in pixels.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[9]</entry> + <entry>Reserved for future extensions. Applications and drivers must + set the array to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The &v4l2-subdev-frame-size-enum; <structfield>pad</structfield> + references a non-existing pad, the <structfield>code</structfield> is + invalid for the given pad or the <structfield>index</structfield> + field is out of bounds.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-subdev-enum-mbus-code.xml b/Documentation/DocBook/media/v4l/vidioc-subdev-enum-mbus-code.xml new file mode 100644 index 00000000000..a6b3432449f --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-subdev-enum-mbus-code.xml @@ -0,0 +1,119 @@ +<refentry id="vidioc-subdev-enum-mbus-code"> + <refmeta> + <refentrytitle>ioctl VIDIOC_SUBDEV_ENUM_MBUS_CODE</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_SUBDEV_ENUM_MBUS_CODE</refname> + <refpurpose>Enumerate media bus formats</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_subdev_mbus_code_enum * + <parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_SUBDEV_ENUM_MBUS_CODE</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <note> + <title>Experimental</title> + <para>This is an <link linkend="experimental">experimental</link> + interface and may change in the future.</para> + </note> + + <para>To enumerate media bus formats available at a given sub-device pad + applications initialize the <structfield>pad</structfield> and + <structfield>index</structfield> fields of &v4l2-subdev-mbus-code-enum; and + call the <constant>VIDIOC_SUBDEV_ENUM_MBUS_CODE</constant> ioctl with a + pointer to this structure. Drivers fill the rest of the structure or return + an &EINVAL; if either the <structfield>pad</structfield> or + <structfield>index</structfield> are invalid. All media bus formats are + enumerable by beginning at index zero and incrementing by one until + <errorcode>EINVAL</errorcode> is returned.</para> + + <para>Available media bus formats may depend on the current 'try' formats + at other pads of the sub-device, as well as on the current active links. See + &VIDIOC-SUBDEV-G-FMT; for more information about the try formats.</para> + + <table pgwide="1" frame="none" id="v4l2-subdev-mbus-code-enum"> + <title>struct <structname>v4l2_subdev_mbus_code_enum</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>pad</structfield></entry> + <entry>Pad number as reported by the media controller API.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>index</structfield></entry> + <entry>Number of the format in the enumeration, set by the + application.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>code</structfield></entry> + <entry>The media bus format code, as defined in + <xref linkend="v4l2-mbus-format" />.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[9]</entry> + <entry>Reserved for future extensions. Applications and drivers must + set the array to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The &v4l2-subdev-mbus-code-enum; <structfield>pad</structfield> + references a non-existing pad, or the <structfield>index</structfield> + field is out of bounds.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-subdev-g-crop.xml b/Documentation/DocBook/media/v4l/vidioc-subdev-g-crop.xml new file mode 100644 index 00000000000..4cddd788c58 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-subdev-g-crop.xml @@ -0,0 +1,158 @@ +<refentry id="vidioc-subdev-g-crop"> + <refmeta> + <refentrytitle>ioctl VIDIOC_SUBDEV_G_CROP, VIDIOC_SUBDEV_S_CROP</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_SUBDEV_G_CROP</refname> + <refname>VIDIOC_SUBDEV_S_CROP</refname> + <refpurpose>Get or set the crop rectangle on a subdev pad</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_subdev_crop *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>const struct v4l2_subdev_crop *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_SUBDEV_G_CROP, VIDIOC_SUBDEV_S_CROP</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <note> + <title>Obsolete</title> + + <para>This is an <link linkend="obsolete">obsolete</link> + interface and may be removed in the future. It is superseded by + <link linkend="vidioc-subdev-g-selection">the selection + API</link>.</para> + </note> + + <para>To retrieve the current crop rectangle applications set the + <structfield>pad</structfield> field of a &v4l2-subdev-crop; to the + desired pad number as reported by the media API and the + <structfield>which</structfield> field to + <constant>V4L2_SUBDEV_FORMAT_ACTIVE</constant>. They then call the + <constant>VIDIOC_SUBDEV_G_CROP</constant> ioctl with a pointer to this + structure. The driver fills the members of the <structfield>rect</structfield> + field or returns &EINVAL; if the input arguments are invalid, or if cropping + is not supported on the given pad.</para> + + <para>To change the current crop rectangle applications set both the + <structfield>pad</structfield> and <structfield>which</structfield> fields + and all members of the <structfield>rect</structfield> field. They then call + the <constant>VIDIOC_SUBDEV_S_CROP</constant> ioctl with a pointer to this + structure. The driver verifies the requested crop rectangle, adjusts it + based on the hardware capabilities and configures the device. Upon return + the &v4l2-subdev-crop; contains the current format as would be returned + by a <constant>VIDIOC_SUBDEV_G_CROP</constant> call.</para> + + <para>Applications can query the device capabilities by setting the + <structfield>which</structfield> to + <constant>V4L2_SUBDEV_FORMAT_TRY</constant>. When set, 'try' crop + rectangles are not applied to the device by the driver, but are mangled + exactly as active crop rectangles and stored in the sub-device file handle. + Two applications querying the same sub-device would thus not interact with + each other.</para> + + <para>Drivers must not return an error solely because the requested crop + rectangle doesn't match the device capabilities. They must instead modify + the rectangle to match what the hardware can provide. The modified format + should be as close as possible to the original request.</para> + + <table pgwide="1" frame="none" id="v4l2-subdev-crop"> + <title>struct <structname>v4l2_subdev_crop</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>pad</structfield></entry> + <entry>Pad number as reported by the media framework.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>which</structfield></entry> + <entry>Crop rectangle to get or set, from + &v4l2-subdev-format-whence;.</entry> + </row> + <row> + <entry>&v4l2-rect;</entry> + <entry><structfield>rect</structfield></entry> + <entry>Crop rectangle boundaries, in pixels.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[8]</entry> + <entry>Reserved for future extensions. Applications and drivers must + set the array to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EBUSY</errorcode></term> + <listitem> + <para>The crop rectangle can't be changed because the pad is currently + busy. This can be caused, for instance, by an active video stream on + the pad. The ioctl must not be retried without performing another + action to fix the problem first. Only returned by + <constant>VIDIOC_SUBDEV_S_CROP</constant></para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The &v4l2-subdev-crop; <structfield>pad</structfield> + references a non-existing pad, the <structfield>which</structfield> + field references a non-existing format, or cropping is not supported + on the given subdev pad.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-subdev-g-fmt.xml b/Documentation/DocBook/media/v4l/vidioc-subdev-g-fmt.xml new file mode 100644 index 00000000000..a67cde6f8c5 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-subdev-g-fmt.xml @@ -0,0 +1,183 @@ +<refentry id="vidioc-subdev-g-fmt"> + <refmeta> + <refentrytitle>ioctl VIDIOC_SUBDEV_G_FMT, VIDIOC_SUBDEV_S_FMT</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_SUBDEV_G_FMT</refname> + <refname>VIDIOC_SUBDEV_S_FMT</refname> + <refpurpose>Get or set the data format on a subdev pad</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_subdev_format *<parameter>argp</parameter> + </paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_SUBDEV_G_FMT, VIDIOC_SUBDEV_S_FMT</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <note> + <title>Experimental</title> + <para>This is an <link linkend="experimental">experimental</link> + interface and may change in the future.</para> + </note> + + <para>These ioctls are used to negotiate the frame format at specific + subdev pads in the image pipeline.</para> + + <para>To retrieve the current format applications set the + <structfield>pad</structfield> field of a &v4l2-subdev-format; to the + desired pad number as reported by the media API and the + <structfield>which</structfield> field to + <constant>V4L2_SUBDEV_FORMAT_ACTIVE</constant>. When they call the + <constant>VIDIOC_SUBDEV_G_FMT</constant> ioctl with a pointer to this + structure the driver fills the members of the <structfield>format</structfield> + field.</para> + + <para>To change the current format applications set both the + <structfield>pad</structfield> and <structfield>which</structfield> fields + and all members of the <structfield>format</structfield> field. When they + call the <constant>VIDIOC_SUBDEV_S_FMT</constant> ioctl with a pointer to this + structure the driver verifies the requested format, adjusts it based on the + hardware capabilities and configures the device. Upon return the + &v4l2-subdev-format; contains the current format as would be returned by a + <constant>VIDIOC_SUBDEV_G_FMT</constant> call.</para> + + <para>Applications can query the device capabilities by setting the + <structfield>which</structfield> to + <constant>V4L2_SUBDEV_FORMAT_TRY</constant>. When set, 'try' formats are not + applied to the device by the driver, but are changed exactly as active + formats and stored in the sub-device file handle. Two applications querying + the same sub-device would thus not interact with each other.</para> + + <para>For instance, to try a format at the output pad of a sub-device, + applications would first set the try format at the sub-device input with the + <constant>VIDIOC_SUBDEV_S_FMT</constant> ioctl. They would then either + retrieve the default format at the output pad with the + <constant>VIDIOC_SUBDEV_G_FMT</constant> ioctl, or set the desired output + pad format with the <constant>VIDIOC_SUBDEV_S_FMT</constant> ioctl and check + the returned value.</para> + + <para>Try formats do not depend on active formats, but can depend on the + current links configuration or sub-device controls value. For instance, a + low-pass noise filter might crop pixels at the frame boundaries, modifying + its output frame size.</para> + + <para>Drivers must not return an error solely because the requested format + doesn't match the device capabilities. They must instead modify the format + to match what the hardware can provide. The modified format should be as + close as possible to the original request.</para> + + <table pgwide="1" frame="none" id="v4l2-subdev-format"> + <title>struct <structname>v4l2_subdev_format</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>pad</structfield></entry> + <entry>Pad number as reported by the media controller API.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>which</structfield></entry> + <entry>Format to modified, from &v4l2-subdev-format-whence;.</entry> + </row> + <row> + <entry>&v4l2-mbus-framefmt;</entry> + <entry><structfield>format</structfield></entry> + <entry>Definition of an image format, see <xref + linkend="v4l2-mbus-framefmt" /> for details.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[8]</entry> + <entry>Reserved for future extensions. Applications and drivers must + set the array to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="v4l2-subdev-format-whence"> + <title>enum <structname>v4l2_subdev_format_whence</structname></title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry>V4L2_SUBDEV_FORMAT_TRY</entry> + <entry>0</entry> + <entry>Try formats, used for querying device capabilities.</entry> + </row> + <row> + <entry>V4L2_SUBDEV_FORMAT_ACTIVE</entry> + <entry>1</entry> + <entry>Active formats, applied to the hardware.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EBUSY</errorcode></term> + <listitem> + <para>The format can't be changed because the pad is currently busy. + This can be caused, for instance, by an active video stream on the + pad. The ioctl must not be retried without performing another action + to fix the problem first. Only returned by + <constant>VIDIOC_SUBDEV_S_FMT</constant></para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The &v4l2-subdev-format; <structfield>pad</structfield> + references a non-existing pad, or the <structfield>which</structfield> + field references a non-existing format.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + <refsect1> + &return-value; + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-subdev-g-frame-interval.xml b/Documentation/DocBook/media/v4l/vidioc-subdev-g-frame-interval.xml new file mode 100644 index 00000000000..0bc3ea22d31 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-subdev-g-frame-interval.xml @@ -0,0 +1,141 @@ +<refentry id="vidioc-subdev-g-frame-interval"> + <refmeta> + <refentrytitle>ioctl VIDIOC_SUBDEV_G_FRAME_INTERVAL, VIDIOC_SUBDEV_S_FRAME_INTERVAL</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_SUBDEV_G_FRAME_INTERVAL</refname> + <refname>VIDIOC_SUBDEV_S_FRAME_INTERVAL</refname> + <refpurpose>Get or set the frame interval on a subdev pad</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_subdev_frame_interval *<parameter>argp</parameter> + </paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_SUBDEV_G_FRAME_INTERVAL, VIDIOC_SUBDEV_S_FRAME_INTERVAL</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <note> + <title>Experimental</title> + <para>This is an <link linkend="experimental">experimental</link> + interface and may change in the future.</para> + </note> + + <para>These ioctls are used to get and set the frame interval at specific + subdev pads in the image pipeline. The frame interval only makes sense for + sub-devices that can control the frame period on their own. This includes, + for instance, image sensors and TV tuners. Sub-devices that don't support + frame intervals must not implement these ioctls.</para> + + <para>To retrieve the current frame interval applications set the + <structfield>pad</structfield> field of a &v4l2-subdev-frame-interval; to + the desired pad number as reported by the media controller API. When they + call the <constant>VIDIOC_SUBDEV_G_FRAME_INTERVAL</constant> ioctl with a + pointer to this structure the driver fills the members of the + <structfield>interval</structfield> field.</para> + + <para>To change the current frame interval applications set both the + <structfield>pad</structfield> field and all members of the + <structfield>interval</structfield> field. When they call the + <constant>VIDIOC_SUBDEV_S_FRAME_INTERVAL</constant> ioctl with a pointer to + this structure the driver verifies the requested interval, adjusts it based + on the hardware capabilities and configures the device. Upon return the + &v4l2-subdev-frame-interval; contains the current frame interval as would be + returned by a <constant>VIDIOC_SUBDEV_G_FRAME_INTERVAL</constant> call. + </para> + + <para>Drivers must not return an error solely because the requested interval + doesn't match the device capabilities. They must instead modify the interval + to match what the hardware can provide. The modified interval should be as + close as possible to the original request.</para> + + <para>Sub-devices that support the frame interval ioctls should implement + them on a single pad only. Their behaviour when supported on multiple pads + of the same sub-device is not defined.</para> + + <table pgwide="1" frame="none" id="v4l2-subdev-frame-interval"> + <title>struct <structname>v4l2_subdev_frame_interval</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>pad</structfield></entry> + <entry>Pad number as reported by the media controller API.</entry> + </row> + <row> + <entry>&v4l2-fract;</entry> + <entry><structfield>interval</structfield></entry> + <entry>Period, in seconds, between consecutive video frames.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[9]</entry> + <entry>Reserved for future extensions. Applications and drivers must + set the array to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EBUSY</errorcode></term> + <listitem> + <para>The frame interval can't be changed because the pad is currently + busy. This can be caused, for instance, by an active video stream on + the pad. The ioctl must not be retried without performing another + action to fix the problem first. Only returned by + <constant>VIDIOC_SUBDEV_S_FRAME_INTERVAL</constant></para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The &v4l2-subdev-frame-interval; <structfield>pad</structfield> + references a non-existing pad, or the pad doesn't support frame + intervals.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-subdev-g-selection.xml b/Documentation/DocBook/media/v4l/vidioc-subdev-g-selection.xml new file mode 100644 index 00000000000..1ba9e999af3 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-subdev-g-selection.xml @@ -0,0 +1,165 @@ +<refentry id="vidioc-subdev-g-selection"> + <refmeta> + <refentrytitle>ioctl VIDIOC_SUBDEV_G_SELECTION, VIDIOC_SUBDEV_S_SELECTION</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_SUBDEV_G_SELECTION</refname> + <refname>VIDIOC_SUBDEV_S_SELECTION</refname> + <refpurpose>Get or set selection rectangles on a subdev pad</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_subdev_selection *<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_SUBDEV_G_SELECTION, VIDIOC_SUBDEV_S_SELECTION</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <note> + <title>Experimental</title> + <para>This is an <link linkend="experimental">experimental</link> + interface and may change in the future.</para> + </note> + + <para>The selections are used to configure various image + processing functionality performed by the subdevs which affect the + image size. This currently includes cropping, scaling and + composition.</para> + + <para>The selection API replaces <link + linkend="vidioc-subdev-g-crop">the old subdev crop API</link>. All + the function of the crop API, and more, are supported by the + selections API.</para> + + <para>See <xref linkend="subdev"></xref> for + more information on how each selection target affects the image + processing pipeline inside the subdevice.</para> + + <refsect2> + <title>Types of selection targets</title> + + <para>There are two types of selection targets: actual and bounds. The + actual targets are the targets which configure the hardware. The BOUNDS + target will return a rectangle that contain all possible actual + rectangles.</para> + </refsect2> + + <refsect2> + <title>Discovering supported features</title> + + <para>To discover which targets are supported, the user can + perform <constant>VIDIOC_SUBDEV_G_SELECTION</constant> on them. + Any unsupported target will return + <constant>EINVAL</constant>.</para> + + <para>Selection targets and flags are documented in <xref + linkend="v4l2-selections-common"/>.</para> + + <table pgwide="1" frame="none" id="v4l2-subdev-selection"> + <title>struct <structname>v4l2_subdev_selection</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>which</structfield></entry> + <entry>Active or try selection, from + &v4l2-subdev-format-whence;.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>pad</structfield></entry> + <entry>Pad number as reported by the media framework.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>target</structfield></entry> + <entry>Target selection rectangle. See + <xref linkend="v4l2-selections-common" />.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>flags</structfield></entry> + <entry>Flags. See + <xref linkend="v4l2-selection-flags" />.</entry> + </row> + <row> + <entry>&v4l2-rect;</entry> + <entry><structfield>rect</structfield></entry> + <entry>Selection rectangle, in pixels.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[8]</entry> + <entry>Reserved for future extensions. Applications and drivers must + set the array to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect2> + + </refsect1> + + <refsect1> + &return-value; + + <variablelist> + <varlistentry> + <term><errorcode>EBUSY</errorcode></term> + <listitem> + <para>The selection rectangle can't be changed because the + pad is currently busy. This can be caused, for instance, by + an active video stream on the pad. The ioctl must not be + retried without performing another action to fix the problem + first. Only returned by + <constant>VIDIOC_SUBDEV_S_SELECTION</constant></para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The &v4l2-subdev-selection; + <structfield>pad</structfield> references a non-existing + pad, the <structfield>which</structfield> field references a + non-existing format, or the selection target is not + supported on the given subdev pad.</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/v4l/vidioc-subscribe-event.xml b/Documentation/DocBook/media/v4l/vidioc-subscribe-event.xml new file mode 100644 index 00000000000..17efa870d4d --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-subscribe-event.xml @@ -0,0 +1,226 @@ +<refentry id="vidioc-subscribe-event"> + <refmeta> + <refentrytitle>ioctl VIDIOC_SUBSCRIBE_EVENT, VIDIOC_UNSUBSCRIBE_EVENT</refentrytitle> + &manvol; + </refmeta> + + <refnamediv> + <refname>VIDIOC_SUBSCRIBE_EVENT, VIDIOC_UNSUBSCRIBE_EVENT</refname> + <refpurpose>Subscribe or unsubscribe event</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <funcsynopsis> + <funcprototype> + <funcdef>int <function>ioctl</function></funcdef> + <paramdef>int <parameter>fd</parameter></paramdef> + <paramdef>int <parameter>request</parameter></paramdef> + <paramdef>struct v4l2_event_subscription +*<parameter>argp</parameter></paramdef> + </funcprototype> + </funcsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Arguments</title> + + <variablelist> + <varlistentry> + <term><parameter>fd</parameter></term> + <listitem> + <para>&fd;</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>request</parameter></term> + <listitem> + <para>VIDIOC_SUBSCRIBE_EVENT, VIDIOC_UNSUBSCRIBE_EVENT</para> + </listitem> + </varlistentry> + <varlistentry> + <term><parameter>argp</parameter></term> + <listitem> + <para></para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Description</title> + + <para>Subscribe or unsubscribe V4L2 event. Subscribed events are + dequeued by using the &VIDIOC-DQEVENT; ioctl.</para> + + <table frame="none" pgwide="1" id="v4l2-event-subscription"> + <title>struct <structname>v4l2_event_subscription</structname></title> + <tgroup cols="3"> + &cs-str; + <tbody valign="top"> + <row> + <entry>__u32</entry> + <entry><structfield>type</structfield></entry> + <entry>Type of the event.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>id</structfield></entry> + <entry>ID of the event source. If there is no ID associated with + the event source, then set this to 0. Whether or not an event + needs an ID depends on the event type.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>flags</structfield></entry> + <entry>Event flags, see <xref linkend="event-flags" />.</entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>reserved</structfield>[5]</entry> + <entry>Reserved for future extensions. Drivers and applications + must set the array to zero.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table frame="none" pgwide="1" id="event-type"> + <title>Event Types</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_EVENT_ALL</constant></entry> + <entry>0</entry> + <entry>All events. V4L2_EVENT_ALL is valid only for + VIDIOC_UNSUBSCRIBE_EVENT for unsubscribing all events at once. + </entry> + </row> + <row> + <entry><constant>V4L2_EVENT_VSYNC</constant></entry> + <entry>1</entry> + <entry>This event is triggered on the vertical sync. + This event has a &v4l2-event-vsync; associated with it. + </entry> + </row> + <row> + <entry><constant>V4L2_EVENT_EOS</constant></entry> + <entry>2</entry> + <entry>This event is triggered when the end of a stream is reached. + This is typically used with MPEG decoders to report to the application + when the last of the MPEG stream has been decoded. + </entry> + </row> + <row> + <entry><constant>V4L2_EVENT_CTRL</constant></entry> + <entry>3</entry> + <entry><para>This event requires that the <structfield>id</structfield> + matches the control ID from which you want to receive events. + This event is triggered if the control's value changes, if a + button control is pressed or if the control's flags change. + This event has a &v4l2-event-ctrl; associated with it. This struct + contains much of the same information as &v4l2-queryctrl; and + &v4l2-control;.</para> + + <para>If the event is generated due to a call to &VIDIOC-S-CTRL; or + &VIDIOC-S-EXT-CTRLS;, then the event will <emphasis>not</emphasis> be sent to + the file handle that called the ioctl function. This prevents + nasty feedback loops. If you <emphasis>do</emphasis> want to get the + event, then set the <constant>V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK</constant> + flag. + </para> + + <para>This event type will ensure that no information is lost when + more events are raised than there is room internally. In that + case the &v4l2-event-ctrl; of the second-oldest event is kept, + but the <structfield>changes</structfield> field of the + second-oldest event is ORed with the <structfield>changes</structfield> + field of the oldest event.</para> + </entry> + </row> + <row> + <entry><constant>V4L2_EVENT_FRAME_SYNC</constant></entry> + <entry>4</entry> + <entry> + <para>Triggered immediately when the reception of a + frame has begun. This event has a + &v4l2-event-frame-sync; associated with it.</para> + + <para>If the hardware needs to be stopped in the case of a + buffer underrun it might not be able to generate this event. + In such cases the <structfield>frame_sequence</structfield> + field in &v4l2-event-frame-sync; will not be incremented. This + causes two consecutive frame sequence numbers to have n times + frame interval in between them.</para> + </entry> + </row> + <row> + <entry><constant>V4L2_EVENT_SOURCE_CHANGE</constant></entry> + <entry>5</entry> + <entry> + <para>This event is triggered when a source parameter change is + detected during runtime by the video device. It can be a + runtime resolution change triggered by a video decoder or the + format change happening on an input connector. + This event requires that the <structfield>id</structfield> + matches the input index (when used with a video device node) + or the pad index (when used with a subdevice node) from which + you want to receive events.</para> + + <para>This event has a &v4l2-event-src-change; associated + with it. The <structfield>changes</structfield> bitfield denotes + what has changed for the subscribed pad. If multiple events + occurred before application could dequeue them, then the changes + will have the ORed value of all the events generated.</para> + </entry> + </row> + <row> + <entry><constant>V4L2_EVENT_PRIVATE_START</constant></entry> + <entry>0x08000000</entry> + <entry>Base event number for driver-private events.</entry> + </row> + </tbody> + </tgroup> + </table> + + <table pgwide="1" frame="none" id="event-flags"> + <title>Event Flags</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_EVENT_SUB_FL_SEND_INITIAL</constant></entry> + <entry>0x0001</entry> + <entry>When this event is subscribed an initial event will be sent + containing the current status. This only makes sense for events + that are triggered by a status change such as <constant>V4L2_EVENT_CTRL</constant>. + Other events will ignore this flag.</entry> + </row> + <row> + <entry><constant>V4L2_EVENT_SUB_FL_ALLOW_FEEDBACK</constant></entry> + <entry>0x0002</entry> + <entry><para>If set, then events directly caused by an ioctl will also be sent to + the filehandle that called that ioctl. For example, changing a control using + &VIDIOC-S-CTRL; will cause a V4L2_EVENT_CTRL to be sent back to that same + filehandle. Normally such events are suppressed to prevent feedback loops + where an application changes a control to a one value and then another, and + then receives an event telling it that that control has changed to the first + value.</para> + + <para>Since it can't tell whether that event was caused by another application + or by the &VIDIOC-S-CTRL; call it is hard to decide whether to set the + control to the value in the event, or ignore it.</para> + + <para>Think carefully when you set this flag so you won't get into situations + like that.</para> + </entry> + </row> + </tbody> + </tgroup> + </table> + + </refsect1> + <refsect1> + &return-value; + </refsect1> +</refentry> diff --git a/Documentation/DocBook/media/vbi_525.gif.b64 b/Documentation/DocBook/media/vbi_525.gif.b64 new file mode 100644 index 00000000000..d5dcf06f2ae --- /dev/null +++ b/Documentation/DocBook/media/vbi_525.gif.b64 @@ -0,0 +1,84 @@ +R0lGODlhKgPIAIAAAAAAAP///yH5BAEAAAEALAAAAAAqA8gAAAL+jI+py+0Po5y02ouz3rz7D4bi 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<returnvalue>-1</returnvalue> and the <varname>errno</varname> variable is set appropriately. The generic error codes are described at the <link linkend='gen-errors'>Generic Error Codes</link> chapter.</para>"> +<!ENTITY return-value-dvb "<para>RETURN VALUE</para><para>On success <returnvalue>0</returnvalue> is returned, on error <returnvalue>-1</returnvalue> and the <varname>errno</varname> variable is set appropriately. The generic error codes are described at the <link linkend='gen-errors'>Generic Error Codes</link> chapter.</para>"> +<!ENTITY manvol "<manvolnum>2</manvolnum>"> + +<!-- Table templates: structs, structs w/union, defines. --> +<!ENTITY cs-str "<colspec colname='c1' colwidth='1*' /><colspec colname='c2' colwidth='1*' /><colspec colname='c3' colwidth='2*' /><spanspec spanname='hspan' namest='c1' nameend='c3' />"> +<!ENTITY cs-ustr "<colspec colname='c1' colwidth='1*' /><colspec colname='c2' colwidth='1*' /><colspec colname='c3' colwidth='1*' /><colspec colname='c4' colwidth='2*' /><spanspec spanname='hspan' namest='c1' nameend='c4' />"> +<!ENTITY cs-def "<colspec colname='c1' colwidth='3*' /><colspec colname='c2' colwidth='1*' /><colspec colname='c3' colwidth='4*' /><spanspec spanname='hspan' namest='c1' nameend='c3' />"> + +<!-- Video for Linux mailing list address. --> +<!ENTITY v4l-ml "<ulink url='http://www.linuxtv.org/lists.php'>http://www.linuxtv.org/lists.php</ulink>"> + +<!-- LinuxTV v4l-dvb repository. --> +<!ENTITY v4l-dvb "<ulink url='http://linuxtv.org/repo/'>http://linuxtv.org/repo/</ulink>"> +<!ENTITY dash-ent-8 "<entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry>"> +<!ENTITY dash-ent-10 "<entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry>"> +<!ENTITY dash-ent-12 "<entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry>"> +<!ENTITY dash-ent-14 "<entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry>"> +<!ENTITY dash-ent-16 "<entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry>"> +<!ENTITY dash-ent-20 "<entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry>"> +<!ENTITY dash-ent-22 "<entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry>"> +<!ENTITY dash-ent-24 "<entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry><entry>-</entry>"> +]> + +<book id="media_api"> +<bookinfo> + <title>LINUX MEDIA INFRASTRUCTURE API</title> + + <copyright> + <year>2009-2014</year> + <holder>LinuxTV Developers</holder> + </copyright> + + <legalnotice> + <para>Permission is granted to copy, distribute and/or modify + this document under the terms of the GNU Free Documentation License, + Version 1.1 or any later version published by the Free Software + Foundation. A copy of the license is included in the chapter entitled + "GNU Free Documentation License"</para> + </legalnotice> +</bookinfo> + +<toc></toc> <!-- autogenerated --> + +<preface> + <title>Introduction</title> + + <para>This document covers the Linux Kernel to Userspace API's used by + video and radio streaming devices, including video cameras, + analog and digital TV receiver cards, AM/FM receiver cards, + streaming capture and output devices, codec devices and remote + controllers.</para> + <para>It is divided into four parts.</para> + <para>The first part covers radio, video capture and output, + cameras, analog TV devices and codecs.</para> + <para>The second part covers the + API used for digital TV and Internet reception via one of the + several digital tv standards. While it is called as DVB API, + in fact it covers several different video standards including + DVB-T, DVB-S, DVB-C and ATSC. The API is currently being updated + to document support also for DVB-S2, ISDB-T and ISDB-S.</para> + <para>The third part covers the Remote Controller API.</para> + <para>The fourth part covers the Media Controller API.</para> + <para>For additional information and for the latest development code, + see: <ulink url="http://linuxtv.org">http://linuxtv.org</ulink>.</para> + <para>For discussing improvements, reporting troubles, sending new drivers, etc, please mail to: <ulink url="http://vger.kernel.org/vger-lists.html#linux-media">Linux Media Mailing List (LMML).</ulink>.</para> +</preface> + +<part id="v4l2spec">&sub-v4l2;</part> +<part id="dvbapi">&sub-dvbapi;</part> +<part id="remotes">&sub-remote_controllers;</part> +<part id="media_common">&sub-media-controller;</part> + +<chapter id="gen_errors">&sub-gen-errors;</chapter> + +&sub-fdl-appendix; + +</book> diff --git a/Documentation/DocBook/mtdnand.tmpl b/Documentation/DocBook/mtdnand.tmpl index 8e145857fc9..7da8f0402af 100644 --- a/Documentation/DocBook/mtdnand.tmpl +++ b/Documentation/DocBook/mtdnand.tmpl @@ -91,7 +91,7 @@ <listitem><para> [MTD Interface]</para><para> These functions provide the interface to the MTD kernel API. - They are not replacable and provide functionality + They are not replaceable and provide functionality which is complete hardware independent. </para></listitem> <listitem><para> @@ -100,14 +100,14 @@ </para></listitem> <listitem><para> [GENERIC]</para><para> - Generic functions are not replacable and provide functionality + Generic functions are not replaceable and provide functionality which is complete hardware independent. </para></listitem> <listitem><para> [DEFAULT]</para><para> Default functions provide hardware related functionality which is suitable for most of the implementations. These functions can be replaced by the - board driver if neccecary. Those functions are called via pointers in the + board driver if necessary. Those functions are called via pointers in the NAND chip description structure. The board driver can set the functions which should be replaced by board dependent functions before calling nand_scan(). If the function pointer is NULL on entry to nand_scan() then the pointer @@ -174,7 +174,7 @@ </para> <programlisting> static struct mtd_info *board_mtd; -static unsigned long baseaddr; +static void __iomem *baseaddr; </programlisting> <para> Static example @@ -182,15 +182,14 @@ static unsigned long baseaddr; <programlisting> static struct mtd_info board_mtd; static struct nand_chip board_chip; -static unsigned long baseaddr; +static void __iomem *baseaddr; </programlisting> </sect1> <sect1 id="Partition_defines"> <title>Partition defines</title> <para> If you want to divide your device into partitions, then - enable the configuration switch CONFIG_MTD_PARTITIONS and define - a partitioning scheme suitable to your board. + define a partitioning scheme suitable to your board. </para> <programlisting> #define NUM_PARTITIONS 2 @@ -250,7 +249,7 @@ static void board_hwcontrol(struct mtd_info *mtd, int cmd) <title>Device ready function</title> <para> If the hardware interface has the ready busy pin of the NAND chip connected to a - GPIO or other accesible I/O pin, this function is used to read back the state of the + GPIO or other accessible I/O pin, this function is used to read back the state of the pin. The function has no arguments and should return 0, if the device is busy (R/B pin is low) and 1, if the device is ready (R/B pin is high). If the hardware interface does not give access to the ready busy pin, then @@ -265,11 +264,11 @@ static void board_hwcontrol(struct mtd_info *mtd, int cmd) is set up nand_scan() is called. This function tries to detect and identify then chip. If a chip is found all the internal data fields are initialized accordingly. - The structure(s) have to be zeroed out first and then filled with the neccecary + The structure(s) have to be zeroed out first and then filled with the necessary information about the device. </para> <programlisting> -int __init board_init (void) +static int __init board_init (void) { struct nand_chip *this; int err = 0; @@ -283,8 +282,8 @@ int __init board_init (void) } /* map physical address */ - baseaddr = (unsigned long)ioremap(CHIP_PHYSICAL_ADDRESS, 1024); - if(!baseaddr){ + baseaddr = ioremap(CHIP_PHYSICAL_ADDRESS, 1024); + if (!baseaddr) { printk("Ioremap to access NAND chip failed\n"); err = -EIO; goto out_mtd; @@ -316,7 +315,7 @@ int __init board_init (void) goto out; out_ior: - iounmap((void *)baseaddr); + iounmap(baseaddr); out_mtd: kfree (board_mtd); out: @@ -328,7 +327,7 @@ module_init(board_init); <sect1 id="Exit_function"> <title>Exit function</title> <para> - The exit function is only neccecary if the driver is + The exit function is only necessary if the driver is compiled as a module. It releases all resources which are held by the chip driver and unregisters the partitions in the MTD layer. @@ -341,7 +340,7 @@ static void __exit board_cleanup (void) nand_release (board_mtd); /* unmap physical address */ - iounmap((void *)baseaddr); + iounmap(baseaddr); /* Free the MTD device structure */ kfree (board_mtd); @@ -362,7 +361,7 @@ module_exit(board_cleanup); <sect1 id="Multiple_chip_control"> <title>Multiple chip control</title> <para> - The nand driver can control chip arrays. Therefor the + The nand driver can control chip arrays. Therefore the board driver must provide an own select_chip function. This function must (de)select the requested chip. The function pointer in the nand_chip structure must @@ -485,17 +484,17 @@ static void board_select_chip (struct mtd_info *mtd, int chip) Reed-Solomon library. </para> <para> - The ECC bytes must be placed immidiately after the data + The ECC bytes must be placed immediately after the data bytes in order to make the syndrome generator work. This is contrary to the usual layout used by software ECC. The - seperation of data and out of band area is not longer + separation of data and out of band area is not longer possible. The nand driver code handles this layout and the remaining free bytes in the oob area are managed by the autoplacement code. Provide a matching oob-layout in this case. See rts_from4.c and diskonchip.c for implementation reference. In those cases we must also use bad block tables on FLASH, because the ECC layout is - interferring with the bad block marker positions. + interfering with the bad block marker positions. See bad block table support for details. </para> </sect2> @@ -543,7 +542,7 @@ static void board_select_chip (struct mtd_info *mtd, int chip) <para> nand_scan() calls the function nand_default_bbt(). nand_default_bbt() selects appropriate default - bad block table desriptors depending on the chip information + bad block table descriptors depending on the chip information which was retrieved by nand_scan(). </para> <para> @@ -555,25 +554,25 @@ static void board_select_chip (struct mtd_info *mtd, int chip) <sect2 id="Flash_based_tables"> <title>Flash based tables</title> <para> - It may be desired or neccecary to keep a bad block table in FLASH. + It may be desired or necessary to keep a bad block table in FLASH. For AG-AND chips this is mandatory, as they have no factory marked bad blocks. They have factory marked good blocks. The marker pattern is erased when the block is erased to be reused. So in case of powerloss before writing the pattern back to the chip this block - would be lost and added to the bad blocks. Therefor we scan the + would be lost and added to the bad blocks. Therefore we scan the chip(s) when we detect them the first time for good blocks and store this information in a bad block table before erasing any of the blocks. </para> <para> - The blocks in which the tables are stored are procteted against + The blocks in which the tables are stored are protected against accidental access by marking them bad in the memory bad block - table. The bad block table managment functions are allowed - to circumvernt this protection. + table. The bad block table management functions are allowed + to circumvent this protection. </para> <para> The simplest way to activate the FLASH based bad block table support - is to set the option NAND_USE_FLASH_BBT in the option field of + is to set the option NAND_BBT_USE_FLASH in the bbt_option field of the nand chip structure before calling nand_scan(). For AG-AND chips is this done by default. This activates the default FLASH based bad block table functionality @@ -593,7 +592,7 @@ static void board_select_chip (struct mtd_info *mtd, int chip) User defined tables are created by filling out a nand_bbt_descr structure and storing the pointer in the nand_chip structure member bbt_td before calling nand_scan(). - If a mirror table is neccecary a second structure must be + If a mirror table is necessary a second structure must be created and a pointer to this structure must be stored in bbt_md inside the nand_chip structure. If the bbt_md member is set to NULL then only the main table is used @@ -629,7 +628,7 @@ static void board_select_chip (struct mtd_info *mtd, int chip) holds the bad block table. Store a pointer to the pattern in the pattern field. Further the length of the pattern has to be stored in len and the offset in the spare area must be given - in the offs member of the nand_bbt_descr stucture. For mirrored + in the offs member of the nand_bbt_descr structure. For mirrored bad block tables different patterns are mandatory.</para></listitem> <listitem><para>Table creation</para> <para>Set the option NAND_BBT_CREATE to enable the table creation @@ -648,7 +647,7 @@ static void board_select_chip (struct mtd_info *mtd, int chip) <listitem><para>Table version control</para> <para>Set the option NAND_BBT_VERSION to enable the table version control. It's highly recommended to enable this for mirrored tables with write - support. It makes sure that the risk of loosing the bad block + support. It makes sure that the risk of losing the bad block table information is reduced to the loss of the information about the one worn out block which should be marked bad. The version is stored in 4 consecutive bytes in the spare area of the device. The position of @@ -667,7 +666,7 @@ static void board_select_chip (struct mtd_info *mtd, int chip) <para> For automatic placement some blocks must be reserved for bad block table storage. The number of reserved blocks is defined - in the maxblocks member of the babd block table description structure. + in the maxblocks member of the bad block table description structure. Reserving 4 blocks for mirrored tables should be a reasonable number. This also limits the number of blocks which are scanned for the bad block table ident pattern. @@ -774,20 +773,6 @@ struct nand_oobinfo { done according to the default builtin scheme. </para> </sect2> - <sect2 id="User_space_placement_selection"> - <title>User space placement selection</title> - <para> - All non ecc functions like mtd->read and mtd->write use an internal - structure, which can be set by an ioctl. This structure is preset - to the autoplacement default. - <programlisting> - ioctl (fd, MEMSETOOBSEL, oobsel); - </programlisting> - oobsel is a pointer to a user supplied structure of type - nand_oobconfig. The contents of this structure must match the - criteria of the filesystem, which will be used. See an example in utils/nandwrite.c. - </para> - </sect2> </sect1> <sect1 id="Spare_area_autoplacement_default"> <title>Spare area autoplacement default schemes</title> @@ -1060,19 +1045,19 @@ data in this page</entry> <row> <entry>0x3D</entry> <entry>ECC byte 21</entry> -<entry>Error correction code byte 0 of the eigth 256 Bytes of data +<entry>Error correction code byte 0 of the eighth 256 Bytes of data in this page</entry> </row> <row> <entry>0x3E</entry> <entry>ECC byte 22</entry> -<entry>Error correction code byte 1 of the eigth 256 Bytes of data +<entry>Error correction code byte 1 of the eighth 256 Bytes of data in this page</entry> </row> <row> <entry>0x3F</entry> <entry>ECC byte 23</entry> -<entry>Error correction code byte 2 of the eigth 256 Bytes of data +<entry>Error correction code byte 2 of the eighth 256 Bytes of data in this page</entry> </row> </tbody></tgroup></informaltable> @@ -1083,18 +1068,18 @@ in this page</entry> <chapter id="filesystems"> <title>Filesystem support</title> <para> - The NAND driver provides all neccecary functions for a + The NAND driver provides all necessary functions for a filesystem via the MTD interface. </para> <para> - Filesystems must be aware of the NAND pecularities and + Filesystems must be aware of the NAND peculiarities and restrictions. One major restrictions of NAND Flash is, that you cannot write as often as you want to a page. The consecutive writes to a page, before erasing it again, are restricted to 1-3 writes, depending on the manufacturers specifications. This applies similar to the spare area. </para> <para> - Therefor NAND aware filesystems must either write in page size chunks + Therefore NAND aware filesystems must either write in page size chunks or hold a writebuffer to collect smaller writes until they sum up to pagesize. Available NAND aware filesystems: JFFS2, YAFFS. </para> @@ -1134,8 +1119,6 @@ in this page</entry> These constants are defined in nand.h. They are ored together to describe the chip functionality. <programlisting> -/* Chip can not auto increment pages */ -#define NAND_NO_AUTOINCR 0x00000001 /* Buswitdh is 16 bit */ #define NAND_BUSWIDTH_16 0x00000002 /* Device supports partial programming without padding */ @@ -1159,9 +1142,6 @@ in this page</entry> These constants are defined in nand.h. They are ored together to describe the functionality. <programlisting> -/* Use a flash based bad block table. This option is parsed by the - * default bad block table function (nand_default_bbt). */ -#define NAND_USE_FLASH_BBT 0x00010000 /* The hw ecc generator provides a syndrome instead a ecc value on read * This can only work if we have the ecc bytes directly behind the * data bytes. Applies for DOC and AG-AND Renesas HW Reed Solomon generators */ @@ -1236,19 +1216,13 @@ in this page</entry> #define NAND_BBT_LASTBLOCK 0x00000010 /* The bbt is at the given page, else we must scan for the bbt */ #define NAND_BBT_ABSPAGE 0x00000020 -/* The bbt is at the given page, else we must scan for the bbt */ -#define NAND_BBT_SEARCH 0x00000040 /* bbt is stored per chip on multichip devices */ #define NAND_BBT_PERCHIP 0x00000080 /* bbt has a version counter at offset veroffs */ #define NAND_BBT_VERSION 0x00000100 /* Create a bbt if none axists */ #define NAND_BBT_CREATE 0x00000200 -/* Search good / bad pattern through all pages of a block */ -#define NAND_BBT_SCANALLPAGES 0x00000400 -/* Scan block empty during good / bad block scan */ -#define NAND_BBT_SCANEMPTY 0x00000800 -/* Write bbt if neccecary */ +/* Write bbt if necessary */ #define NAND_BBT_WRITE 0x00001000 /* Read and write back block contents when writing bbt */ #define NAND_BBT_SAVECONTENT 0x00002000 diff --git a/Documentation/DocBook/networking.tmpl b/Documentation/DocBook/networking.tmpl index 59ad69a9d77..29df25016c7 100644 --- a/Documentation/DocBook/networking.tmpl +++ b/Documentation/DocBook/networking.tmpl @@ -56,7 +56,7 @@ !Enet/core/filter.c </sect1> <sect1><title>Generic Network Statistics</title> -!Iinclude/linux/gen_stats.h +!Iinclude/uapi/linux/gen_stats.h !Enet/core/gen_stats.c !Enet/core/gen_estimator.c </sect1> @@ -80,7 +80,7 @@ !Enet/wimax/op-rfkill.c !Enet/wimax/stack.c !Iinclude/net/wimax.h -!Iinclude/linux/wimax.h +!Iinclude/uapi/linux/wimax.h </sect1> </chapter> diff --git a/Documentation/DocBook/procfs-guide.tmpl b/Documentation/DocBook/procfs-guide.tmpl deleted file mode 100644 index 9eba4b7af73..00000000000 --- a/Documentation/DocBook/procfs-guide.tmpl +++ /dev/null @@ -1,626 +0,0 @@ -<?xml version="1.0" encoding="UTF-8"?> -<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN" - "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" [ -<!ENTITY procfsexample SYSTEM "procfs_example.xml"> -]> - -<book id="LKProcfsGuide"> - <bookinfo> - <title>Linux Kernel Procfs Guide</title> - - <authorgroup> - <author> - <firstname>Erik</firstname> - <othername>(J.A.K.)</othername> - <surname>Mouw</surname> - <affiliation> - <address> - <email>mouw@nl.linux.org</email> - </address> - </affiliation> - </author> - <othercredit> - <contrib> - This software and documentation were written while working on the - LART computing board - (<ulink url="http://www.lartmaker.nl/">http://www.lartmaker.nl/</ulink>), - which was sponsored by the Delt University of Technology projects - Mobile Multi-media Communications and Ubiquitous Communications. - </contrib> - </othercredit> - </authorgroup> - - <revhistory> - <revision> - <revnumber>1.0</revnumber> - <date>May 30, 2001</date> - <revremark>Initial revision posted to linux-kernel</revremark> - </revision> - <revision> - <revnumber>1.1</revnumber> - <date>June 3, 2001</date> - <revremark>Revised after comments from linux-kernel</revremark> - </revision> - </revhistory> - - <copyright> - <year>2001</year> - <holder>Erik Mouw</holder> - </copyright> - - - <legalnotice> - <para> - This documentation is free software; you can redistribute it - and/or modify it under the terms of the GNU General Public - License as published by the Free Software Foundation; either - version 2 of the License, or (at your option) any later - version. - </para> - - <para> - This documentation is distributed in the hope that it will be - useful, but WITHOUT ANY WARRANTY; without even the implied - warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR - PURPOSE. See the GNU General Public License for more details. - </para> - - <para> - You should have received a copy of the GNU General Public - License along with this program; if not, write to the Free - Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, - MA 02111-1307 USA - </para> - - <para> - For more details see the file COPYING in the source - distribution of Linux. - </para> - </legalnotice> - </bookinfo> - - - - - <toc> - </toc> - - - - - <preface id="Preface"> - <title>Preface</title> - - <para> - This guide describes the use of the procfs file system from - within the Linux kernel. The idea to write this guide came up on - the #kernelnewbies IRC channel (see <ulink - url="http://www.kernelnewbies.org/">http://www.kernelnewbies.org/</ulink>), - when Jeff Garzik explained the use of procfs and forwarded me a - message Alexander Viro wrote to the linux-kernel mailing list. I - agreed to write it up nicely, so here it is. - </para> - - <para> - I'd like to thank Jeff Garzik - <email>jgarzik@pobox.com</email> and Alexander Viro - <email>viro@parcelfarce.linux.theplanet.co.uk</email> for their input, - Tim Waugh <email>twaugh@redhat.com</email> for his <ulink - url="http://people.redhat.com/twaugh/docbook/selfdocbook/">Selfdocbook</ulink>, - and Marc Joosen <email>marcj@historia.et.tudelft.nl</email> for - proofreading. - </para> - - <para> - Erik - </para> - </preface> - - - - - <chapter id="intro"> - <title>Introduction</title> - - <para> - The <filename class="directory">/proc</filename> file system - (procfs) is a special file system in the linux kernel. It's a - virtual file system: it is not associated with a block device - but exists only in memory. The files in the procfs are there to - allow userland programs access to certain information from the - kernel (like process information in <filename - class="directory">/proc/[0-9]+/</filename>), but also for debug - purposes (like <filename>/proc/ksyms</filename>). - </para> - - <para> - This guide describes the use of the procfs file system from - within the Linux kernel. It starts by introducing all relevant - functions to manage the files within the file system. After that - it shows how to communicate with userland, and some tips and - tricks will be pointed out. Finally a complete example will be - shown. - </para> - - <para> - Note that the files in <filename - class="directory">/proc/sys</filename> are sysctl files: they - don't belong to procfs and are governed by a completely - different API described in the Kernel API book. - </para> - </chapter> - - - - - <chapter id="managing"> - <title>Managing procfs entries</title> - - <para> - This chapter describes the functions that various kernel - components use to populate the procfs with files, symlinks, - device nodes, and directories. - </para> - - <para> - A minor note before we start: if you want to use any of the - procfs functions, be sure to include the correct header file! - This should be one of the first lines in your code: - </para> - - <programlisting> -#include <linux/proc_fs.h> - </programlisting> - - - - - <sect1 id="regularfile"> - <title>Creating a regular file</title> - - <funcsynopsis> - <funcprototype> - <funcdef>struct proc_dir_entry* <function>create_proc_entry</function></funcdef> - <paramdef>const char* <parameter>name</parameter></paramdef> - <paramdef>mode_t <parameter>mode</parameter></paramdef> - <paramdef>struct proc_dir_entry* <parameter>parent</parameter></paramdef> - </funcprototype> - </funcsynopsis> - - <para> - This function creates a regular file with the name - <parameter>name</parameter>, file mode - <parameter>mode</parameter> in the directory - <parameter>parent</parameter>. To create a file in the root of - the procfs, use <constant>NULL</constant> as - <parameter>parent</parameter> parameter. When successful, the - function will return a pointer to the freshly created - <structname>struct proc_dir_entry</structname>; otherwise it - will return <constant>NULL</constant>. <xref - linkend="userland"/> describes how to do something useful with - regular files. - </para> - - <para> - Note that it is specifically supported that you can pass a - path that spans multiple directories. For example - <function>create_proc_entry</function>(<parameter>"drivers/via0/info"</parameter>) - will create the <filename class="directory">via0</filename> - directory if necessary, with standard - <constant>0755</constant> permissions. - </para> - - <para> - If you only want to be able to read the file, the function - <function>create_proc_read_entry</function> described in <xref - linkend="convenience"/> may be used to create and initialise - the procfs entry in one single call. - </para> - </sect1> - - - - - <sect1 id="Creating_a_symlink"> - <title>Creating a symlink</title> - - <funcsynopsis> - <funcprototype> - <funcdef>struct proc_dir_entry* - <function>proc_symlink</function></funcdef> <paramdef>const - char* <parameter>name</parameter></paramdef> - <paramdef>struct proc_dir_entry* - <parameter>parent</parameter></paramdef> <paramdef>const - char* <parameter>dest</parameter></paramdef> - </funcprototype> - </funcsynopsis> - - <para> - This creates a symlink in the procfs directory - <parameter>parent</parameter> that points from - <parameter>name</parameter> to - <parameter>dest</parameter>. This translates in userland to - <literal>ln -s</literal> <parameter>dest</parameter> - <parameter>name</parameter>. - </para> - </sect1> - - <sect1 id="Creating_a_directory"> - <title>Creating a directory</title> - - <funcsynopsis> - <funcprototype> - <funcdef>struct proc_dir_entry* <function>proc_mkdir</function></funcdef> - <paramdef>const char* <parameter>name</parameter></paramdef> - <paramdef>struct proc_dir_entry* <parameter>parent</parameter></paramdef> - </funcprototype> - </funcsynopsis> - - <para> - Create a directory <parameter>name</parameter> in the procfs - directory <parameter>parent</parameter>. - </para> - </sect1> - - - - - <sect1 id="Removing_an_entry"> - <title>Removing an entry</title> - - <funcsynopsis> - <funcprototype> - <funcdef>void <function>remove_proc_entry</function></funcdef> - <paramdef>const char* <parameter>name</parameter></paramdef> - <paramdef>struct proc_dir_entry* <parameter>parent</parameter></paramdef> - </funcprototype> - </funcsynopsis> - - <para> - Removes the entry <parameter>name</parameter> in the directory - <parameter>parent</parameter> from the procfs. Entries are - removed by their <emphasis>name</emphasis>, not by the - <structname>struct proc_dir_entry</structname> returned by the - various create functions. Note that this function doesn't - recursively remove entries. - </para> - - <para> - Be sure to free the <structfield>data</structfield> entry from - the <structname>struct proc_dir_entry</structname> before - <function>remove_proc_entry</function> is called (that is: if - there was some <structfield>data</structfield> allocated, of - course). See <xref linkend="usingdata"/> for more information - on using the <structfield>data</structfield> entry. - </para> - </sect1> - </chapter> - - - - - <chapter id="userland"> - <title>Communicating with userland</title> - - <para> - Instead of reading (or writing) information directly from - kernel memory, procfs works with <emphasis>call back - functions</emphasis> for files: functions that are called when - a specific file is being read or written. Such functions have - to be initialised after the procfs file is created by setting - the <structfield>read_proc</structfield> and/or - <structfield>write_proc</structfield> fields in the - <structname>struct proc_dir_entry*</structname> that the - function <function>create_proc_entry</function> returned: - </para> - - <programlisting> -struct proc_dir_entry* entry; - -entry->read_proc = read_proc_foo; -entry->write_proc = write_proc_foo; - </programlisting> - - <para> - If you only want to use a the - <structfield>read_proc</structfield>, the function - <function>create_proc_read_entry</function> described in <xref - linkend="convenience"/> may be used to create and initialise the - procfs entry in one single call. - </para> - - - - <sect1 id="Reading_data"> - <title>Reading data</title> - - <para> - The read function is a call back function that allows userland - processes to read data from the kernel. The read function - should have the following format: - </para> - - <funcsynopsis> - <funcprototype> - <funcdef>int <function>read_func</function></funcdef> - <paramdef>char* <parameter>buffer</parameter></paramdef> - <paramdef>char** <parameter>start</parameter></paramdef> - <paramdef>off_t <parameter>off</parameter></paramdef> - <paramdef>int <parameter>count</parameter></paramdef> - <paramdef>int* <parameter>peof</parameter></paramdef> - <paramdef>void* <parameter>data</parameter></paramdef> - </funcprototype> - </funcsynopsis> - - <para> - The read function should write its information into the - <parameter>buffer</parameter>, which will be exactly - <literal>PAGE_SIZE</literal> bytes long. - </para> - - <para> - The parameter - <parameter>peof</parameter> should be used to signal that the - end of the file has been reached by writing - <literal>1</literal> to the memory location - <parameter>peof</parameter> points to. - </para> - - <para> - The <parameter>data</parameter> - parameter can be used to create a single call back function for - several files, see <xref linkend="usingdata"/>. - </para> - - <para> - The rest of the parameters and the return value are described - by a comment in <filename>fs/proc/generic.c</filename> as follows: - </para> - - <blockquote> - <para> - You have three ways to return data: - </para> - <orderedlist> - <listitem> - <para> - Leave <literal>*start = NULL</literal>. (This is the default.) - Put the data of the requested offset at that - offset within the buffer. Return the number (<literal>n</literal>) - of bytes there are from the beginning of the - buffer up to the last byte of data. If the - number of supplied bytes (<literal>= n - offset</literal>) is - greater than zero and you didn't signal eof - and the reader is prepared to take more data - you will be called again with the requested - offset advanced by the number of bytes - absorbed. This interface is useful for files - no larger than the buffer. - </para> - </listitem> - <listitem> - <para> - Set <literal>*start</literal> to an unsigned long value less than - the buffer address but greater than zero. - Put the data of the requested offset at the - beginning of the buffer. Return the number of - bytes of data placed there. If this number is - greater than zero and you didn't signal eof - and the reader is prepared to take more data - you will be called again with the requested - offset advanced by <literal>*start</literal>. This interface is - useful when you have a large file consisting - of a series of blocks which you want to count - and return as wholes. - (Hack by Paul.Russell@rustcorp.com.au) - </para> - </listitem> - <listitem> - <para> - Set <literal>*start</literal> to an address within the buffer. - Put the data of the requested offset at <literal>*start</literal>. - Return the number of bytes of data placed there. - If this number is greater than zero and you - didn't signal eof and the reader is prepared to - take more data you will be called again with the - requested offset advanced by the number of bytes - absorbed. - </para> - </listitem> - </orderedlist> - </blockquote> - - <para> - <xref linkend="example"/> shows how to use a read call back - function. - </para> - </sect1> - - - - - <sect1 id="Writing_data"> - <title>Writing data</title> - - <para> - The write call back function allows a userland process to write - data to the kernel, so it has some kind of control over the - kernel. The write function should have the following format: - </para> - - <funcsynopsis> - <funcprototype> - <funcdef>int <function>write_func</function></funcdef> - <paramdef>struct file* <parameter>file</parameter></paramdef> - <paramdef>const char* <parameter>buffer</parameter></paramdef> - <paramdef>unsigned long <parameter>count</parameter></paramdef> - <paramdef>void* <parameter>data</parameter></paramdef> - </funcprototype> - </funcsynopsis> - - <para> - The write function should read <parameter>count</parameter> - bytes at maximum from the <parameter>buffer</parameter>. Note - that the <parameter>buffer</parameter> doesn't live in the - kernel's memory space, so it should first be copied to kernel - space with <function>copy_from_user</function>. The - <parameter>file</parameter> parameter is usually - ignored. <xref linkend="usingdata"/> shows how to use the - <parameter>data</parameter> parameter. - </para> - - <para> - Again, <xref linkend="example"/> shows how to use this call back - function. - </para> - </sect1> - - - - - <sect1 id="usingdata"> - <title>A single call back for many files</title> - - <para> - When a large number of almost identical files is used, it's - quite inconvenient to use a separate call back function for - each file. A better approach is to have a single call back - function that distinguishes between the files by using the - <structfield>data</structfield> field in <structname>struct - proc_dir_entry</structname>. First of all, the - <structfield>data</structfield> field has to be initialised: - </para> - - <programlisting> -struct proc_dir_entry* entry; -struct my_file_data *file_data; - -file_data = kmalloc(sizeof(struct my_file_data), GFP_KERNEL); -entry->data = file_data; - </programlisting> - - <para> - The <structfield>data</structfield> field is a <type>void - *</type>, so it can be initialised with anything. - </para> - - <para> - Now that the <structfield>data</structfield> field is set, the - <function>read_proc</function> and - <function>write_proc</function> can use it to distinguish - between files because they get it passed into their - <parameter>data</parameter> parameter: - </para> - - <programlisting> -int foo_read_func(char *page, char **start, off_t off, - int count, int *eof, void *data) -{ - int len; - - if(data == file_data) { - /* special case for this file */ - } else { - /* normal processing */ - } - - return len; -} - </programlisting> - - <para> - Be sure to free the <structfield>data</structfield> data field - when removing the procfs entry. - </para> - </sect1> - </chapter> - - - - - <chapter id="tips"> - <title>Tips and tricks</title> - - - - - <sect1 id="convenience"> - <title>Convenience functions</title> - - <funcsynopsis> - <funcprototype> - <funcdef>struct proc_dir_entry* <function>create_proc_read_entry</function></funcdef> - <paramdef>const char* <parameter>name</parameter></paramdef> - <paramdef>mode_t <parameter>mode</parameter></paramdef> - <paramdef>struct proc_dir_entry* <parameter>parent</parameter></paramdef> - <paramdef>read_proc_t* <parameter>read_proc</parameter></paramdef> - <paramdef>void* <parameter>data</parameter></paramdef> - </funcprototype> - </funcsynopsis> - - <para> - This function creates a regular file in exactly the same way - as <function>create_proc_entry</function> from <xref - linkend="regularfile"/> does, but also allows to set the read - function <parameter>read_proc</parameter> in one call. This - function can set the <parameter>data</parameter> as well, like - explained in <xref linkend="usingdata"/>. - </para> - </sect1> - - - - <sect1 id="Modules"> - <title>Modules</title> - - <para> - If procfs is being used from within a module, be sure to set - the <structfield>owner</structfield> field in the - <structname>struct proc_dir_entry</structname> to - <constant>THIS_MODULE</constant>. - </para> - - <programlisting> -struct proc_dir_entry* entry; - -entry->owner = THIS_MODULE; - </programlisting> - </sect1> - - - - - <sect1 id="Mode_and_ownership"> - <title>Mode and ownership</title> - - <para> - Sometimes it is useful to change the mode and/or ownership of - a procfs entry. Here is an example that shows how to achieve - that: - </para> - - <programlisting> -struct proc_dir_entry* entry; - -entry->mode = S_IWUSR |S_IRUSR | S_IRGRP | S_IROTH; -entry->uid = 0; -entry->gid = 100; - </programlisting> - - </sect1> - </chapter> - - - - - <chapter id="example"> - <title>Example</title> - - <!-- be careful with the example code: it shouldn't be wider than - approx. 60 columns, or otherwise it won't fit properly on a page - --> - -&procfsexample; - - </chapter> -</book> diff --git a/Documentation/DocBook/procfs_example.c b/Documentation/DocBook/procfs_example.c deleted file mode 100644 index a5b11793b1e..00000000000 --- a/Documentation/DocBook/procfs_example.c +++ /dev/null @@ -1,201 +0,0 @@ -/* - * procfs_example.c: an example proc interface - * - * Copyright (C) 2001, Erik Mouw (mouw@nl.linux.org) - * - * This file accompanies the procfs-guide in the Linux kernel - * source. Its main use is to demonstrate the concepts and - * functions described in the guide. - * - * This software has been developed while working on the LART - * computing board (http://www.lartmaker.nl), which was sponsored - * by the Delt University of Technology projects Mobile Multi-media - * Communications and Ubiquitous Communications. - * - * This program is free software; you can redistribute - * it and/or modify it under the terms of the GNU General - * Public License as published by the Free Software - * Foundation; either version 2 of the License, or (at your - * option) any later version. - * - * This program is distributed in the hope that it will be - * useful, but WITHOUT ANY WARRANTY; without even the implied - * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR - * PURPOSE. See the GNU General Public License for more - * details. - * - * You should have received a copy of the GNU General Public - * License along with this program; if not, write to the - * Free Software Foundation, Inc., 59 Temple Place, - * Suite 330, Boston, MA 02111-1307 USA - * - */ - -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/init.h> -#include <linux/proc_fs.h> -#include <linux/jiffies.h> -#include <asm/uaccess.h> - - -#define MODULE_VERS "1.0" -#define MODULE_NAME "procfs_example" - -#define FOOBAR_LEN 8 - -struct fb_data_t { - char name[FOOBAR_LEN + 1]; - char value[FOOBAR_LEN + 1]; -}; - - -static struct proc_dir_entry *example_dir, *foo_file, - *bar_file, *jiffies_file, *symlink; - - -struct fb_data_t foo_data, bar_data; - - -static int proc_read_jiffies(char *page, char **start, - off_t off, int count, - int *eof, void *data) -{ - int len; - - len = sprintf(page, "jiffies = %ld\n", - jiffies); - - return len; -} - - -static int proc_read_foobar(char *page, char **start, - off_t off, int count, - int *eof, void *data) -{ - int len; - struct fb_data_t *fb_data = (struct fb_data_t *)data; - - /* DON'T DO THAT - buffer overruns are bad */ - len = sprintf(page, "%s = '%s'\n", - fb_data->name, fb_data->value); - - return len; -} - - -static int proc_write_foobar(struct file *file, - const char *buffer, - unsigned long count, - void *data) -{ - int len; - struct fb_data_t *fb_data = (struct fb_data_t *)data; - - if(count > FOOBAR_LEN) - len = FOOBAR_LEN; - else - len = count; - - if(copy_from_user(fb_data->value, buffer, len)) - return -EFAULT; - - fb_data->value[len] = '\0'; - - return len; -} - - -static int __init init_procfs_example(void) -{ - int rv = 0; - - /* create directory */ - example_dir = proc_mkdir(MODULE_NAME, NULL); - if(example_dir == NULL) { - rv = -ENOMEM; - goto out; - } - /* create jiffies using convenience function */ - jiffies_file = create_proc_read_entry("jiffies", - 0444, example_dir, - proc_read_jiffies, - NULL); - if(jiffies_file == NULL) { - rv = -ENOMEM; - goto no_jiffies; - } - - /* create foo and bar files using same callback - * functions - */ - foo_file = create_proc_entry("foo", 0644, example_dir); - if(foo_file == NULL) { - rv = -ENOMEM; - goto no_foo; - } - - strcpy(foo_data.name, "foo"); - strcpy(foo_data.value, "foo"); - foo_file->data = &foo_data; - foo_file->read_proc = proc_read_foobar; - foo_file->write_proc = proc_write_foobar; - - bar_file = create_proc_entry("bar", 0644, example_dir); - if(bar_file == NULL) { - rv = -ENOMEM; - goto no_bar; - } - - strcpy(bar_data.name, "bar"); - strcpy(bar_data.value, "bar"); - bar_file->data = &bar_data; - bar_file->read_proc = proc_read_foobar; - bar_file->write_proc = proc_write_foobar; - - /* create symlink */ - symlink = proc_symlink("jiffies_too", example_dir, - "jiffies"); - if(symlink == NULL) { - rv = -ENOMEM; - goto no_symlink; - } - - /* everything OK */ - printk(KERN_INFO "%s %s initialised\n", - MODULE_NAME, MODULE_VERS); - return 0; - -no_symlink: - remove_proc_entry("bar", example_dir); -no_bar: - remove_proc_entry("foo", example_dir); -no_foo: - remove_proc_entry("jiffies", example_dir); -no_jiffies: - remove_proc_entry(MODULE_NAME, NULL); -out: - return rv; -} - - -static void __exit cleanup_procfs_example(void) -{ - remove_proc_entry("jiffies_too", example_dir); - remove_proc_entry("bar", example_dir); - remove_proc_entry("foo", example_dir); - remove_proc_entry("jiffies", example_dir); - remove_proc_entry(MODULE_NAME, NULL); - - printk(KERN_INFO "%s %s removed\n", - MODULE_NAME, MODULE_VERS); -} - - -module_init(init_procfs_example); -module_exit(cleanup_procfs_example); - -MODULE_AUTHOR("Erik Mouw"); -MODULE_DESCRIPTION("procfs examples"); -MODULE_LICENSE("GPL"); diff --git a/Documentation/DocBook/rapidio.tmpl b/Documentation/DocBook/rapidio.tmpl index 54eb26b5737..50479360d84 100644 --- a/Documentation/DocBook/rapidio.tmpl +++ b/Documentation/DocBook/rapidio.tmpl @@ -133,7 +133,6 @@ !Idrivers/rapidio/rio-sysfs.c </sect1> <sect1 id="PPC32_support"><title>PPC32 support</title> -!Earch/powerpc/sysdev/fsl_rio.c !Iarch/powerpc/sysdev/fsl_rio.c </sect1> </chapter> diff --git a/Documentation/DocBook/regulator.tmpl b/Documentation/DocBook/regulator.tmpl index 53f4f8d3b81..3b08a085d2c 100644 --- a/Documentation/DocBook/regulator.tmpl +++ b/Documentation/DocBook/regulator.tmpl @@ -155,7 +155,7 @@ release regulators. Functions are provided to <link linkend='API-regulator-enable'>enable</link> and <link linkend='API-regulator-disable'>disable</link> the - reguator and to get and set the runtime parameters of the + regulator and to get and set the runtime parameters of the regulator. </para> <para> @@ -267,8 +267,8 @@ <sect1 id="machine-constraint"> <title>Constraints</title> <para> - As well as definining the connections the machine interface - also provides constraints definining the operations that + As well as defining the connections the machine interface + also provides constraints defining the operations that clients are allowed to perform and the parameters that may be set. This is required since generally regulator devices will offer more flexibility than it is safe to use on a given diff --git a/Documentation/DocBook/scsi.tmpl b/Documentation/DocBook/scsi.tmpl index 10a150ae2a7..324b53494f0 100644 --- a/Documentation/DocBook/scsi.tmpl +++ b/Documentation/DocBook/scsi.tmpl @@ -317,7 +317,7 @@ <para> The SAS transport class contains common code to deal with SAS HBAs, an aproximated representation of SAS topologies in the driver model, - and various sysfs attributes to expose these topologies and managment + and various sysfs attributes to expose these topologies and management interfaces to userspace. </para> <para> @@ -393,7 +393,7 @@ </para> <para> For documentation see - <ulink url='http://www.torque.net/sg/sdebug26.html'>http://www.torque.net/sg/sdebug26.html</ulink> + <ulink url='http://sg.danny.cz/sg/sdebug26.html'>http://sg.danny.cz/sg/sdebug26.html</ulink> </para> <!-- !Edrivers/scsi/scsi_debug.c --> </sect2> diff --git a/Documentation/DocBook/sh.tmpl b/Documentation/DocBook/sh.tmpl index 0c3dc4c69dd..4a38f604fa6 100644 --- a/Documentation/DocBook/sh.tmpl +++ b/Documentation/DocBook/sh.tmpl @@ -19,13 +19,17 @@ </authorgroup> <copyright> - <year>2008</year> + <year>2008-2010</year> <holder>Paul Mundt</holder> </copyright> <copyright> - <year>2008</year> + <year>2008-2010</year> <holder>Renesas Technology Corp.</holder> </copyright> + <copyright> + <year>2010</year> + <holder>Renesas Electronics Corp.</holder> + </copyright> <legalnotice> <para> @@ -75,10 +79,6 @@ </sect2> </sect1> </chapter> - <chapter id="clk"> - <title>Clock Framework Extensions</title> -!Iarch/sh/include/asm/clock.h - </chapter> <chapter id="mach"> <title>Machine Specific Interfaces</title> <sect1 id="dreamcast"> diff --git a/Documentation/DocBook/stylesheet.xsl b/Documentation/DocBook/stylesheet.xsl index 974e17ccf10..85b25275196 100644 --- a/Documentation/DocBook/stylesheet.xsl +++ b/Documentation/DocBook/stylesheet.xsl @@ -3,6 +3,8 @@ <param name="chunk.quietly">1</param> <param name="funcsynopsis.style">ansi</param> <param name="funcsynopsis.tabular.threshold">80</param> +<param name="callout.graphics">0</param> <!-- <param name="paper.type">A4</param> --> <param name="generate.section.toc.level">2</param> +<param name="use.id.as.filename">1</param> </stylesheet> diff --git a/Documentation/DocBook/tracepoint.tmpl b/Documentation/DocBook/tracepoint.tmpl index b0756d0fd57..b57a9ede322 100644 --- a/Documentation/DocBook/tracepoint.tmpl +++ b/Documentation/DocBook/tracepoint.tmpl @@ -16,6 +16,15 @@ </address> </affiliation> </author> + <author> + <firstname>William</firstname> + <surname>Cohen</surname> + <affiliation> + <address> + <email>wcohen@redhat.com</email> + </address> + </affiliation> + </author> </authorgroup> <legalnotice> @@ -86,4 +95,18 @@ !Iinclude/trace/events/irq.h </chapter> + <chapter id="signal"> + <title>SIGNAL</title> +!Iinclude/trace/events/signal.h + </chapter> + + <chapter id="block"> + <title>Block IO</title> +!Iinclude/trace/events/block.h + </chapter> + + <chapter id="workqueue"> + <title>Workqueue</title> +!Iinclude/trace/events/workqueue.h + </chapter> </book> diff --git a/Documentation/DocBook/uio-howto.tmpl b/Documentation/DocBook/uio-howto.tmpl index 8f6e3b2403c..bbe9c1fd5ce 100644 --- a/Documentation/DocBook/uio-howto.tmpl +++ b/Documentation/DocBook/uio-howto.tmpl @@ -16,7 +16,7 @@ </orgname> <address> - <email>hjk@linutronix.de</email> + <email>hjk@hansjkoch.de</email> </address> </affiliation> </author> @@ -25,6 +25,10 @@ <year>2006-2008</year> <holder>Hans-Jürgen Koch.</holder> </copyright> +<copyright> + <year>2009</year> + <holder>Red Hat Inc, Michael S. Tsirkin (mst@redhat.com)</holder> +</copyright> <legalnotice> <para> @@ -42,6 +46,13 @@ GPL version 2. <revhistory> <revision> + <revnumber>0.9</revnumber> + <date>2009-07-16</date> + <authorinitials>mst</authorinitials> + <revremark>Added generic pci driver + </revremark> + </revision> + <revision> <revnumber>0.8</revnumber> <date>2008-12-24</date> <authorinitials>hjk</authorinitials> @@ -103,7 +114,7 @@ GPL version 2. <para>If you know of any translations for this document, or you are interested in translating it, please email me -<email>hjk@linutronix.de</email>. +<email>hjk@hansjkoch.de</email>. </para> </sect1> @@ -160,7 +171,7 @@ interested in translating it, please email me <title>Feedback</title> <para>Find something wrong with this document? (Or perhaps something right?) I would love to hear from you. Please email me at - <email>hjk@linutronix.de</email>.</para> + <email>hjk@hansjkoch.de</email>.</para> </sect1> </chapter> @@ -510,6 +521,11 @@ Here's a description of the fields of <varname>struct uio_mem</varname>: <itemizedlist> <listitem><para> +<varname>const char *name</varname>: Optional. Set this to help identify +the memory region, it will show up in the corresponding sysfs node. +</para></listitem> + +<listitem><para> <varname>int memtype</varname>: Required if the mapping is used. Set this to <varname>UIO_MEM_PHYS</varname> if you you have physical memory on your card to be mapped. Use <varname>UIO_MEM_LOGICAL</varname> for logical @@ -518,7 +534,7 @@ memory (e.g. allocated with <function>kmalloc()</function>). There's also </para></listitem> <listitem><para> -<varname>unsigned long addr</varname>: Required if the mapping is used. +<varname>phys_addr_t addr</varname>: Required if the mapping is used. Fill in the address of your memory block. This address is the one that appears in sysfs. </para></listitem> @@ -542,7 +558,7 @@ instead to remember such an address. </itemizedlist> <para> -Please do not touch the <varname>kobj</varname> element of +Please do not touch the <varname>map</varname> element of <varname>struct uio_mem</varname>! It is used by the UIO framework to set up sysfs files for this mapping. Simply leave it alone. </para> @@ -703,6 +719,62 @@ framework to set up sysfs files for this region. Simply leave it alone. </para> </sect1> +<sect1 id="using uio_dmem_genirq"> +<title>Using uio_dmem_genirq for platform devices</title> + <para> + In addition to statically allocated memory ranges, they may also be + a desire to use dynamically allocated regions in a user space driver. + In particular, being able to access memory made available through the + dma-mapping API, may be particularly useful. The + <varname>uio_dmem_genirq</varname> driver provides a way to accomplish + this. + </para> + <para> + This driver is used in a similar manner to the + <varname>"uio_pdrv_genirq"</varname> driver with respect to interrupt + configuration and handling. + </para> + <para> + Set the <varname>.name</varname> element of + <varname>struct platform_device</varname> to + <varname>"uio_dmem_genirq"</varname> to use this driver. + </para> + <para> + When using this driver, fill in the <varname>.platform_data</varname> + element of <varname>struct platform_device</varname>, which is of type + <varname>struct uio_dmem_genirq_pdata</varname> and which contains the + following elements: + </para> + <itemizedlist> + <listitem><varname>struct uio_info uioinfo</varname>: The same + structure used as the <varname>uio_pdrv_genirq</varname> platform + data</listitem> + <listitem><varname>unsigned int *dynamic_region_sizes</varname>: + Pointer to list of sizes of dynamic memory regions to be mapped into + user space. + </listitem> + <listitem><varname>unsigned int num_dynamic_regions</varname>: + Number of elements in <varname>dynamic_region_sizes</varname> array. + </listitem> + </itemizedlist> + <para> + The dynamic regions defined in the platform data will be appended to + the <varname> mem[] </varname> array after the platform device + resources, which implies that the total number of static and dynamic + memory regions cannot exceed <varname>MAX_UIO_MAPS</varname>. + </para> + <para> + The dynamic memory regions will be allocated when the UIO device file, + <varname>/dev/uioX</varname> is opened. + Similar to static memory resources, the memory region information for + dynamic regions is then visible via sysfs at + <varname>/sys/class/uio/uioX/maps/mapY/*</varname>. + The dynamic memory regions will be freed when the UIO device file is + closed. When no processes are holding the device file open, the address + returned to userspace is ~0. + </para> +</sect1> + </chapter> <chapter id="userspace_driver" xreflabel="Writing a driver in user space"> @@ -786,7 +858,7 @@ framework to set up sysfs files for this region. Simply leave it alone. perform some initialization. After that, your hardware starts working and will generate an interrupt as soon as it's finished, has some data available, or needs your - attention because an error occured. + attention because an error occurred. </para> <para> <filename>/dev/uioX</filename> is a read-only file. A @@ -809,6 +881,158 @@ framework to set up sysfs files for this region. Simply leave it alone. </chapter> +<chapter id="uio_pci_generic" xreflabel="Using Generic driver for PCI cards"> +<?dbhtml filename="uio_pci_generic.html"?> +<title>Generic PCI UIO driver</title> + <para> + The generic driver is a kernel module named uio_pci_generic. + It can work with any device compliant to PCI 2.3 (circa 2002) and + any compliant PCI Express device. Using this, you only need to + write the userspace driver, removing the need to write + a hardware-specific kernel module. + </para> + +<sect1 id="uio_pci_generic_binding"> +<title>Making the driver recognize the device</title> + <para> +Since the driver does not declare any device ids, it will not get loaded +automatically and will not automatically bind to any devices, you must load it +and allocate id to the driver yourself. For example: + <programlisting> + modprobe uio_pci_generic + echo "8086 10f5" > /sys/bus/pci/drivers/uio_pci_generic/new_id + </programlisting> + </para> + <para> +If there already is a hardware specific kernel driver for your device, the +generic driver still won't bind to it, in this case if you want to use the +generic driver (why would you?) you'll have to manually unbind the hardware +specific driver and bind the generic driver, like this: + <programlisting> + echo -n 0000:00:19.0 > /sys/bus/pci/drivers/e1000e/unbind + echo -n 0000:00:19.0 > /sys/bus/pci/drivers/uio_pci_generic/bind + </programlisting> + </para> + <para> +You can verify that the device has been bound to the driver +by looking for it in sysfs, for example like the following: + <programlisting> + ls -l /sys/bus/pci/devices/0000:00:19.0/driver + </programlisting> +Which if successful should print + <programlisting> + .../0000:00:19.0/driver -> ../../../bus/pci/drivers/uio_pci_generic + </programlisting> +Note that the generic driver will not bind to old PCI 2.2 devices. +If binding the device failed, run the following command: + <programlisting> + dmesg + </programlisting> +and look in the output for failure reasons + </para> +</sect1> + +<sect1 id="uio_pci_generic_internals"> +<title>Things to know about uio_pci_generic</title> + <para> +Interrupts are handled using the Interrupt Disable bit in the PCI command +register and Interrupt Status bit in the PCI status register. All devices +compliant to PCI 2.3 (circa 2002) and all compliant PCI Express devices should +support these bits. uio_pci_generic detects this support, and won't bind to +devices which do not support the Interrupt Disable Bit in the command register. + </para> + <para> +On each interrupt, uio_pci_generic sets the Interrupt Disable bit. +This prevents the device from generating further interrupts +until the bit is cleared. The userspace driver should clear this +bit before blocking and waiting for more interrupts. + </para> +</sect1> +<sect1 id="uio_pci_generic_userspace"> +<title>Writing userspace driver using uio_pci_generic</title> + <para> +Userspace driver can use pci sysfs interface, or the +libpci libray that wraps it, to talk to the device and to +re-enable interrupts by writing to the command register. + </para> +</sect1> +<sect1 id="uio_pci_generic_example"> +<title>Example code using uio_pci_generic</title> + <para> +Here is some sample userspace driver code using uio_pci_generic: +<programlisting> +#include <stdlib.h> +#include <stdio.h> +#include <unistd.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <errno.h> + +int main() +{ + int uiofd; + int configfd; + int err; + int i; + unsigned icount; + unsigned char command_high; + + uiofd = open("/dev/uio0", O_RDONLY); + if (uiofd < 0) { + perror("uio open:"); + return errno; + } + configfd = open("/sys/class/uio/uio0/device/config", O_RDWR); + if (configfd < 0) { + perror("config open:"); + return errno; + } + + /* Read and cache command value */ + err = pread(configfd, &command_high, 1, 5); + if (err != 1) { + perror("command config read:"); + return errno; + } + command_high &= ~0x4; + + for(i = 0;; ++i) { + /* Print out a message, for debugging. */ + if (i == 0) + fprintf(stderr, "Started uio test driver.\n"); + else + fprintf(stderr, "Interrupts: %d\n", icount); + + /****************************************/ + /* Here we got an interrupt from the + device. Do something to it. */ + /****************************************/ + + /* Re-enable interrupts. */ + err = pwrite(configfd, &command_high, 1, 5); + if (err != 1) { + perror("config write:"); + break; + } + + /* Wait for next interrupt. */ + err = read(uiofd, &icount, 4); + if (err != 4) { + perror("uio read:"); + break; + } + + } + return errno; +} + +</programlisting> + </para> +</sect1> + +</chapter> + <appendix id="app1"> <title>Further information</title> <itemizedlist> diff --git a/Documentation/DocBook/usb.tmpl b/Documentation/DocBook/usb.tmpl index af293606fbe..85fc0e28576 100644 --- a/Documentation/DocBook/usb.tmpl +++ b/Documentation/DocBook/usb.tmpl @@ -153,7 +153,7 @@ <listitem><para>The Linux USB API supports synchronous calls for control and bulk messages. - It also supports asynchnous calls for all kinds of data transfer, + It also supports asynchronous calls for all kinds of data transfer, using request structures called "URBs" (USB Request Blocks). </para></listitem> @@ -690,7 +690,7 @@ usbdev_ioctl (int fd, int ifno, unsigned request, void *param) </para><para> This request lets kernel drivers talk to user mode code through filesystem operations even when they don't create - a charactor or block special device. + a character or block special device. It's also been used to do things like ask devices what device special file should be used. Two pre-defined ioctls are used diff --git a/Documentation/DocBook/w1.tmpl b/Documentation/DocBook/w1.tmpl new file mode 100644 index 00000000000..b0228d4c81b --- /dev/null +++ b/Documentation/DocBook/w1.tmpl @@ -0,0 +1,101 @@ +<?xml version="1.0" encoding="UTF-8"?> +<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN" + "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" []> + +<book id="w1id"> + <bookinfo> + <title>W1: Dallas' 1-wire bus</title> + + <authorgroup> + <author> + <firstname>David</firstname> + <surname>Fries</surname> + <affiliation> + <address> + <email>David@Fries.net</email> + </address> + </affiliation> + </author> + + </authorgroup> + + <copyright> + <year>2013</year> + <!-- + <holder></holder> + --> + </copyright> + + <legalnotice> + <para> + This documentation is free software; you can redistribute + it and/or modify it under the terms of the GNU General Public + License version 2. + </para> + + <para> + This program is distributed in the hope that it will be + useful, but WITHOUT ANY WARRANTY; without even the implied + warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + For more details see the file COPYING in the source + distribution of Linux. + </para> + </legalnotice> + </bookinfo> + + <toc></toc> + + <chapter id="w1_internal"> + <title>W1 API internal to the kernel</title> + + <sect1 id="w1_internal_api"> + <title>W1 API internal to the kernel</title> + <sect2 id="w1.h"> + <title>drivers/w1/w1.h</title> + <para>W1 core functions.</para> +!Idrivers/w1/w1.h + </sect2> + + <sect2 id="w1.c"> + <title>drivers/w1/w1.c</title> + <para>W1 core functions.</para> +!Idrivers/w1/w1.c + </sect2> + + <sect2 id="w1_family.h"> + <title>drivers/w1/w1_family.h</title> + <para>Allows registering device family operations.</para> +!Idrivers/w1/w1_family.h + </sect2> + + <sect2 id="w1_family.c"> + <title>drivers/w1/w1_family.c</title> + <para>Allows registering device family operations.</para> +!Edrivers/w1/w1_family.c + </sect2> + + <sect2 id="w1_int.c"> + <title>drivers/w1/w1_int.c</title> + <para>W1 internal initialization for master devices.</para> +!Edrivers/w1/w1_int.c + </sect2> + + <sect2 id="w1_netlink.h"> + <title>drivers/w1/w1_netlink.h</title> + <para>W1 external netlink API structures and commands.</para> +!Idrivers/w1/w1_netlink.h + </sect2> + + <sect2 id="w1_io.c"> + <title>drivers/w1/w1_io.c</title> + <para>W1 input/output.</para> +!Edrivers/w1/w1_io.c +!Idrivers/w1/w1_io.c + </sect2> + + </sect1> + + + </chapter> + +</book> diff --git a/Documentation/DocBook/writing-an-alsa-driver.tmpl b/Documentation/DocBook/writing-an-alsa-driver.tmpl index 7a2e0e98986..6f639d9530b 100644 --- a/Documentation/DocBook/writing-an-alsa-driver.tmpl +++ b/Documentation/DocBook/writing-an-alsa-driver.tmpl @@ -404,7 +404,7 @@ /* SNDRV_CARDS: maximum number of cards supported by this module */ static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; - static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP; + static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP; /* definition of the chip-specific record */ struct mychip { @@ -433,9 +433,9 @@ /* chip-specific constructor * (see "Management of Cards and Components") */ - static int __devinit snd_mychip_create(struct snd_card *card, - struct pci_dev *pci, - struct mychip **rchip) + static int snd_mychip_create(struct snd_card *card, + struct pci_dev *pci, + struct mychip **rchip) { struct mychip *chip; int err; @@ -468,15 +468,13 @@ return err; } - snd_card_set_dev(card, &pci->dev); - *rchip = chip; return 0; } /* constructor -- see "Constructor" sub-section */ - static int __devinit snd_mychip_probe(struct pci_dev *pci, - const struct pci_device_id *pci_id) + static int snd_mychip_probe(struct pci_dev *pci, + const struct pci_device_id *pci_id) { static int dev; struct snd_card *card; @@ -492,7 +490,8 @@ } /* (2) */ - err = snd_card_create(index[dev], id[dev], THIS_MODULE, 0, &card); + err = snd_card_new(&pci->dev, index[dev], id[dev], THIS_MODULE, + 0, &card); if (err < 0) return err; @@ -526,7 +525,7 @@ } /* destructor -- see the "Destructor" sub-section */ - static void __devexit snd_mychip_remove(struct pci_dev *pci) + static void snd_mychip_remove(struct pci_dev *pci) { snd_card_free(pci_get_drvdata(pci)); pci_set_drvdata(pci, NULL); @@ -542,9 +541,8 @@ <para> The real constructor of PCI drivers is the <function>probe</function> callback. The <function>probe</function> callback and other component-constructors which are called - from the <function>probe</function> callback should be defined with - the <parameter>__devinit</parameter> prefix. You - cannot use the <parameter>__init</parameter> prefix for them, + from the <function>probe</function> callback cannot be used with + the <parameter>__init</parameter> prefix because any PCI device could be a hotplug device. </para> @@ -592,7 +590,8 @@ struct snd_card *card; int err; .... - err = snd_card_create(index[dev], id[dev], THIS_MODULE, 0, &card); + err = snd_card_new(&pci->dev, index[dev], id[dev], THIS_MODULE, + 0, &card); ]]> </programlisting> </informalexample> @@ -728,7 +727,7 @@ <informalexample> <programlisting> <![CDATA[ - static void __devexit snd_mychip_remove(struct pci_dev *pci) + static void snd_mychip_remove(struct pci_dev *pci) { snd_card_free(pci_get_drvdata(pci)); pci_set_drvdata(pci, NULL); @@ -810,28 +809,34 @@ <para> As mentioned above, to create a card instance, call - <function>snd_card_create()</function>. + <function>snd_card_new()</function>. <informalexample> <programlisting> <![CDATA[ struct snd_card *card; int err; - err = snd_card_create(index, id, module, extra_size, &card); + err = snd_card_new(&pci->dev, index, id, module, extra_size, &card); ]]> </programlisting> </informalexample> </para> <para> - The function takes five arguments, the card-index number, the - id string, the module pointer (usually + The function takes six arguments: the parent device pointer, + the card-index number, the id string, the module pointer (usually <constant>THIS_MODULE</constant>), the size of extra-data space, and the pointer to return the card instance. The extra_size argument is used to allocate card->private_data for the chip-specific data. Note that these data - are allocated by <function>snd_card_create()</function>. + are allocated by <function>snd_card_new()</function>. + </para> + + <para> + The first argument, the pointer of struct + <structname>device</structname>, specifies the parent device. + For PCI devices, typically &pci-> is passed there. </para> </section> @@ -872,9 +877,8 @@ <para> This function itself doesn't allocate the data space. The data must be allocated manually beforehand, and its pointer is passed - as the argument. This pointer is used as the - (<parameter>chip</parameter> identifier in the above example) - for the instance. + as the argument. This pointer (<parameter>chip</parameter> in the + above example) is used as the identifier for the instance. </para> <para> @@ -918,16 +922,16 @@ </para> <section id="card-management-chip-specific-snd-card-new"> - <title>1. Allocating via <function>snd_card_create()</function>.</title> + <title>1. Allocating via <function>snd_card_new()</function>.</title> <para> As mentioned above, you can pass the extra-data-length - to the 4th argument of <function>snd_card_create()</function>, i.e. + to the 5th argument of <function>snd_card_new()</function>, i.e. <informalexample> <programlisting> <![CDATA[ - err = snd_card_create(index[dev], id[dev], THIS_MODULE, - sizeof(struct mychip), &card); + err = snd_card_new(&pci->dev, index[dev], id[dev], THIS_MODULE, + sizeof(struct mychip), &card); ]]> </programlisting> </informalexample> @@ -956,7 +960,7 @@ <para> After allocating a card instance via - <function>snd_card_create()</function> (with + <function>snd_card_new()</function> (with <constant>0</constant> on the 4th arg), call <function>kzalloc()</function>. @@ -965,7 +969,8 @@ <![CDATA[ struct snd_card *card; struct mychip *chip; - err = snd_card_create(index[dev], id[dev], THIS_MODULE, 0, &card); + err = snd_card_new(&pci->dev, index[dev], id[dev], THIS_MODULE, + 0, &card); ..... chip = kzalloc(sizeof(*chip), GFP_KERNEL); ]]> @@ -1059,14 +1064,6 @@ </para> <para> - As further notes, the destructors (both - <function>snd_mychip_dev_free</function> and - <function>snd_mychip_free</function>) cannot be defined with - the <parameter>__devexit</parameter> prefix, because they may be - called from the constructor, too, at the false path. - </para> - - <para> For a device which allows hotplugging, you can use <function>snd_card_free_when_closed</function>. This one will postpone the destruction until all devices are closed. @@ -1120,9 +1117,9 @@ } /* chip-specific constructor */ - static int __devinit snd_mychip_create(struct snd_card *card, - struct pci_dev *pci, - struct mychip **rchip) + static int snd_mychip_create(struct snd_card *card, + struct pci_dev *pci, + struct mychip **rchip) { struct mychip *chip; int err; @@ -1164,7 +1161,7 @@ } chip->port = pci_resource_start(pci, 0); if (request_irq(pci->irq, snd_mychip_interrupt, - IRQF_SHARED, "My Chip", chip)) { + IRQF_SHARED, KBUILD_MODNAME, chip)) { printk(KERN_ERR "cannot grab irq %d\n", pci->irq); snd_mychip_free(chip); return -EBUSY; @@ -1180,8 +1177,6 @@ return err; } - snd_card_set_dev(card, &pci->dev); - *rchip = chip; return 0; } @@ -1197,10 +1192,10 @@ /* pci_driver definition */ static struct pci_driver driver = { - .name = "My Own Chip", + .name = KBUILD_MODNAME, .id_table = snd_mychip_ids, .probe = snd_mychip_probe, - .remove = __devexit_p(snd_mychip_remove), + .remove = snd_mychip_remove, }; /* module initialization */ @@ -1340,7 +1335,7 @@ <programlisting> <![CDATA[ if (request_irq(pci->irq, snd_mychip_interrupt, - IRQF_SHARED, "My Chip", chip)) { + IRQF_SHARED, KBUILD_MODNAME, chip)) { printk(KERN_ERR "cannot grab irq %d\n", pci->irq); snd_mychip_free(chip); return -EBUSY; @@ -1465,11 +1460,6 @@ </para> <para> - Again, remember that you cannot - use the <parameter>__devexit</parameter> prefix for this destructor. - </para> - - <para> We didn't implement the hardware disabling part in the above. If you need to do this, please note that the destructor may be called even before the initialization of the chip is completed. @@ -1541,30 +1531,6 @@ </section> - <section id="pci-resource-device-struct"> - <title>Registration of Device Struct</title> - <para> - At some point, typically after calling <function>snd_device_new()</function>, - you need to register the struct <structname>device</structname> of the chip - you're handling for udev and co. ALSA provides a macro for compatibility with - older kernels. Simply call like the following: - <informalexample> - <programlisting> -<![CDATA[ - snd_card_set_dev(card, &pci->dev); -]]> - </programlisting> - </informalexample> - so that it stores the PCI's device pointer to the card. This will be - referred by ALSA core functions later when the devices are registered. - </para> - <para> - In the case of non-PCI, pass the proper device struct pointer of the BUS - instead. (In the case of legacy ISA without PnP, you don't have to do - anything.) - </para> - </section> - <section id="pci-resource-entries"> <title>PCI Entries</title> <para> @@ -1616,10 +1582,10 @@ <programlisting> <![CDATA[ static struct pci_driver driver = { - .name = "My Own Chip", + .name = KBUILD_MODNAME, .id_table = snd_mychip_ids, .probe = snd_mychip_probe, - .remove = __devexit_p(snd_mychip_remove), + .remove = snd_mychip_remove, }; ]]> </programlisting> @@ -1630,11 +1596,7 @@ The <structfield>probe</structfield> and <structfield>remove</structfield> functions have already been defined in the previous sections. - The <structfield>remove</structfield> function should - be defined with the - <function>__devexit_p()</function> macro, so that it's not - defined for built-in (and non-hot-pluggable) case. The - <structfield>name</structfield> + The <structfield>name</structfield> field is the name string of this device. Note that you must not use a slash <quote>/</quote> in this string. </para> @@ -1665,9 +1627,7 @@ <para> Note that these module entries are tagged with <parameter>__init</parameter> and - <parameter>__exit</parameter> prefixes, not - <parameter>__devinit</parameter> nor - <parameter>__devexit</parameter>. + <parameter>__exit</parameter> prefixes. </para> <para> @@ -1918,7 +1878,7 @@ */ /* create a pcm device */ - static int __devinit snd_mychip_new_pcm(struct mychip *chip) + static int snd_mychip_new_pcm(struct mychip *chip) { struct snd_pcm *pcm; int err; @@ -1957,7 +1917,7 @@ <informalexample> <programlisting> <![CDATA[ - static int __devinit snd_mychip_new_pcm(struct mychip *chip) + static int snd_mychip_new_pcm(struct mychip *chip) { struct snd_pcm *pcm; int err; @@ -2124,7 +2084,7 @@ .... } - static int __devinit snd_mychip_new_pcm(struct mychip *chip) + static int snd_mychip_new_pcm(struct mychip *chip) { struct snd_pcm *pcm; .... @@ -2324,7 +2284,7 @@ struct _snd_pcm_runtime { <constant>SNDRV_PCM_INFO_XXX</constant>. Here, at least, you have to specify whether the mmap is supported and which interleaved format is supported. - When the is supported, add the + When the hardware supports mmap, add the <constant>SNDRV_PCM_INFO_MMAP</constant> flag here. When the hardware supports the interleaved or the non-interleaved formats, <constant>SNDRV_PCM_INFO_INTERLEAVED</constant> or @@ -2918,7 +2878,7 @@ struct _snd_pcm_runtime { <para> When the pcm supports the pause operation (given in the info - field of the hardware table), the <constant>PAUSE_PUSE</constant> + field of the hardware table), the <constant>PAUSE_PUSH</constant> and <constant>PAUSE_RELEASE</constant> commands must be handled here, too. The former is the command to pause the pcm, and the latter to restart the pcm again. @@ -3105,7 +3065,7 @@ struct _snd_pcm_runtime { <section id="pcm-interface-interrupt-handler-timer"> <title>High frequency timer interrupts</title> <para> - This happense when the hardware doesn't generate interrupts + This happens when the hardware doesn't generate interrupts at the period boundary but issues timer interrupts at a fixed timer rate (e.g. es1968 or ymfpci drivers). In this case, you need to check the current hardware @@ -3271,18 +3231,19 @@ struct _snd_pcm_runtime { <title>Example of Hardware Constraints for Channels</title> <programlisting> <![CDATA[ - static int hw_rule_format_by_channels(struct snd_pcm_hw_params *params, + static int hw_rule_channels_by_format(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule) { struct snd_interval *c = hw_param_interval(params, - SNDRV_PCM_HW_PARAM_CHANNELS); + SNDRV_PCM_HW_PARAM_CHANNELS); struct snd_mask *f = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); - struct snd_mask fmt; + struct snd_interval ch; - snd_mask_any(&fmt); /* Init the struct */ - if (c->min < 2) { - fmt.bits[0] &= SNDRV_PCM_FMTBIT_S16_LE; - return snd_mask_refine(f, &fmt); + snd_interval_any(&ch); + if (f->bits[0] == SNDRV_PCM_FMTBIT_S16_LE) { + ch.min = ch.max = 1; + ch.integer = 1; + return snd_interval_refine(c, &ch); } return 0; } @@ -3298,35 +3259,35 @@ struct _snd_pcm_runtime { <programlisting> <![CDATA[ snd_pcm_hw_rule_add(substream->runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, - hw_rule_channels_by_format, 0, SNDRV_PCM_HW_PARAM_FORMAT, - -1); + hw_rule_channels_by_format, NULL, + SNDRV_PCM_HW_PARAM_FORMAT, -1); ]]> </programlisting> </informalexample> </para> <para> - The rule function is called when an application sets the number of - channels. But an application can set the format before the number of - channels. Thus you also need to define the inverse rule: + The rule function is called when an application sets the PCM + format, and it refines the number of channels accordingly. + But an application may set the number of channels before + setting the format. Thus you also need to define the inverse rule: <example> - <title>Example of Hardware Constraints for Channels</title> + <title>Example of Hardware Constraints for Formats</title> <programlisting> <![CDATA[ - static int hw_rule_channels_by_format(struct snd_pcm_hw_params *params, + static int hw_rule_format_by_channels(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule) { struct snd_interval *c = hw_param_interval(params, - SNDRV_PCM_HW_PARAM_CHANNELS); + SNDRV_PCM_HW_PARAM_CHANNELS); struct snd_mask *f = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); - struct snd_interval ch; + struct snd_mask fmt; - snd_interval_any(&ch); - if (f->bits[0] == SNDRV_PCM_FMTBIT_S16_LE) { - ch.min = ch.max = 1; - ch.integer = 1; - return snd_interval_refine(c, &ch); + snd_mask_any(&fmt); /* Init the struct */ + if (c->min < 2) { + fmt.bits[0] &= SNDRV_PCM_FMTBIT_S16_LE; + return snd_mask_refine(f, &fmt); } return 0; } @@ -3341,8 +3302,8 @@ struct _snd_pcm_runtime { <programlisting> <![CDATA[ snd_pcm_hw_rule_add(substream->runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, - hw_rule_format_by_channels, 0, SNDRV_PCM_HW_PARAM_CHANNELS, - -1); + hw_rule_format_by_channels, NULL, + SNDRV_PCM_HW_PARAM_CHANNELS, -1); ]]> </programlisting> </informalexample> @@ -3399,7 +3360,7 @@ struct _snd_pcm_runtime { <title>Definition of a Control</title> <programlisting> <![CDATA[ - static struct snd_kcontrol_new my_control __devinitdata = { + static struct snd_kcontrol_new my_control = { .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = "PCM Playback Switch", .index = 0, @@ -3415,13 +3376,6 @@ struct _snd_pcm_runtime { </para> <para> - Most likely the control is created via - <function>snd_ctl_new1()</function>, and in such a case, you can - add the <parameter>__devinitdata</parameter> prefix to the - definition as above. - </para> - - <para> The <structfield>iface</structfield> field specifies the control type, <constant>SNDRV_CTL_ELEM_IFACE_XXX</constant>, which is usually <constant>MIXER</constant>. @@ -3847,10 +3801,8 @@ struct _snd_pcm_runtime { <para> <function>snd_ctl_new1()</function> allocates a new - <structname>snd_kcontrol</structname> instance (that's why the definition - of <parameter>my_control</parameter> can be with - the <parameter>__devinitdata</parameter> - prefix), and <function>snd_ctl_add</function> assigns the given + <structname>snd_kcontrol</structname> instance, + and <function>snd_ctl_add</function> assigns the given control component to the card. </para> </section> @@ -3896,7 +3848,7 @@ struct _snd_pcm_runtime { <![CDATA[ static DECLARE_TLV_DB_SCALE(db_scale_my_control, -4050, 150, 0); - static struct snd_kcontrol_new my_control __devinitdata = { + static struct snd_kcontrol_new my_control = { ... .access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ, @@ -4288,7 +4240,7 @@ struct _snd_pcm_runtime { <![CDATA[ struct snd_rawmidi *rmidi; snd_mpu401_uart_new(card, 0, MPU401_HW_MPU401, port, info_flags, - irq, irq_flags, &rmidi); + irq, &rmidi); ]]> </programlisting> </informalexample> @@ -4343,6 +4295,13 @@ struct _snd_pcm_runtime { by itself to start processing the output stream in the irq handler. </para> + <para> + If the MPU-401 interface shares its interrupt with the other logical + devices on the card, set <constant>MPU401_INFO_IRQ_HOOK</constant> + (see <link linkend="midi-interface-interrupt-handler"><citetitle> + below</citetitle></link>). + </para> + <para> Usually, the port address corresponds to the command port and port + 1 corresponds to the data port. If not, you may change @@ -4375,14 +4334,12 @@ struct _snd_pcm_runtime { </para> <para> - The 6th argument specifies the irq number for UART. If the irq - is already allocated, pass 0 to the 7th argument - (<parameter>irq_flags</parameter>). Otherwise, pass the flags - for irq allocation - (<constant>SA_XXX</constant> bits) to it, and the irq will be - reserved by the mpu401-uart layer. If the card doesn't generate - UART interrupts, pass -1 as the irq number. Then a timer - interrupt will be invoked for polling. + The 6th argument specifies the ISA irq number that will be + allocated. If no interrupt is to be allocated (because your + code is already allocating a shared interrupt, or because the + device does not use interrupts), pass -1 instead. + For a MPU-401 device without an interrupt, a polling timer + will be used instead. </para> </section> @@ -4390,12 +4347,13 @@ struct _snd_pcm_runtime { <title>Interrupt Handler</title> <para> When the interrupt is allocated in - <function>snd_mpu401_uart_new()</function>, the private - interrupt handler is used, hence you don't have anything else to do - than creating the mpu401 stuff. Otherwise, you have to call - <function>snd_mpu401_uart_interrupt()</function> explicitly when - a UART interrupt is invoked and checked in your own interrupt - handler. + <function>snd_mpu401_uart_new()</function>, an exclusive ISA + interrupt handler is automatically used, hence you don't have + anything else to do than creating the mpu401 stuff. Otherwise, you + have to set <constant>MPU401_INFO_IRQ_HOOK</constant>, and call + <function>snd_mpu401_uart_interrupt()</function> explicitly from your + own interrupt handler when it has determined that a UART interrupt + has occurred. </para> <para> @@ -4784,7 +4742,7 @@ struct _snd_pcm_runtime { FM registers can be directly accessed through the direct-FM API, defined in <filename><sound/asound_fm.h></filename>. In ALSA native mode, FM registers are accessed through - the Hardware-Dependant Device direct-FM extension API, whereas in + the Hardware-Dependent Device direct-FM extension API, whereas in OSS compatible mode, FM registers can be accessed with the OSS direct-FM compatible API in <filename>/dev/dmfmX</filename> device. </para> @@ -5318,7 +5276,7 @@ struct _snd_pcm_runtime { pages of the given size and map them onto the virtually contiguous memory. The virtual pointer is addressed in runtime->dma_area. The physical address (runtime->dma_addr) is set to zero, - because the buffer is physically non-contigous. + because the buffer is physically non-contiguous. The physical address table is set up in sgbuf->table. You can get the physical address at a certain offset via <function>snd_pcm_sgbuf_get_addr()</function>. @@ -5518,34 +5476,41 @@ struct _snd_pcm_runtime { ]]> </programlisting> </informalexample> + + For the raw data, <structfield>size</structfield> field must be + set properly. This specifies the maximum size of the proc file access. </para> <para> - The callback is much more complicated than the text-file - version. You need to use a low-level I/O functions such as + The read/write callbacks of raw mode are more direct than the text mode. + You need to use a low-level I/O functions such as <function>copy_from/to_user()</function> to transfer the data. <informalexample> <programlisting> <![CDATA[ - static long my_file_io_read(struct snd_info_entry *entry, + static ssize_t my_file_io_read(struct snd_info_entry *entry, void *file_private_data, struct file *file, char *buf, - unsigned long count, - unsigned long pos) + size_t count, + loff_t pos) { - long size = count; - if (pos + size > local_max_size) - size = local_max_size - pos; - if (copy_to_user(buf, local_data + pos, size)) + if (copy_to_user(buf, local_data + pos, count)) return -EFAULT; - return size; + return count; } ]]> </programlisting> </informalexample> + + If the size of the info entry has been set up properly, + <structfield>count</structfield> and <structfield>pos</structfield> are + guaranteed to fit within 0 and the given size. + You don't have to check the range in the callbacks unless any + other condition is required. + </para> </chapter> @@ -5731,7 +5696,7 @@ struct _snd_pcm_runtime { suspending the PCM operations via <function>snd_pcm_suspend_all()</function> or <function>snd_pcm_suspend()</function>. It means that the PCM - streams are already stoppped when the register snapshot is + streams are already stopped when the register snapshot is taken. But, remember that you don't have to restart the PCM stream in the resume callback. It'll be restarted via trigger call with <constant>SNDRV_PCM_TRIGGER_RESUME</constant> @@ -5748,15 +5713,16 @@ struct _snd_pcm_runtime { <informalexample> <programlisting> <![CDATA[ - static int __devinit snd_mychip_probe(struct pci_dev *pci, - const struct pci_device_id *pci_id) + static int snd_mychip_probe(struct pci_dev *pci, + const struct pci_device_id *pci_id) { .... struct snd_card *card; struct mychip *chip; int err; .... - err = snd_card_create(index[dev], id[dev], THIS_MODULE, 0, &card); + err = snd_card_new(&pci->dev, index[dev], id[dev], THIS_MODULE, + 0, &card); .... chip = kzalloc(sizeof(*chip), GFP_KERNEL); .... @@ -5768,22 +5734,22 @@ struct _snd_pcm_runtime { </informalexample> When you created the chip data with - <function>snd_card_create()</function>, it's anyway accessible + <function>snd_card_new()</function>, it's anyway accessible via <structfield>private_data</structfield> field. <informalexample> <programlisting> <![CDATA[ - static int __devinit snd_mychip_probe(struct pci_dev *pci, - const struct pci_device_id *pci_id) + static int snd_mychip_probe(struct pci_dev *pci, + const struct pci_device_id *pci_id) { .... struct snd_card *card; struct mychip *chip; int err; .... - err = snd_card_create(index[dev], id[dev], THIS_MODULE, - sizeof(struct mychip), &card); + err = snd_card_new(&pci->dev, index[dev], id[dev], THIS_MODULE, + sizeof(struct mychip), &card); .... chip = card->private_data; .... @@ -5809,10 +5775,10 @@ struct _snd_pcm_runtime { <programlisting> <![CDATA[ static struct pci_driver driver = { - .name = "My Chip", + .name = KBUILD_MODNAME, .id_table = snd_my_ids, .probe = snd_my_probe, - .remove = __devexit_p(snd_my_remove), + .remove = snd_my_remove, #ifdef CONFIG_PM .suspend = snd_my_suspend, .resume = snd_my_resume, @@ -6180,14 +6146,12 @@ struct _snd_pcm_runtime { <para> The macro takes an conditional expression to evaluate. - When <constant>CONFIG_SND_DEBUG</constant>, is set, the - expression is actually evaluated. If it's non-zero, it shows - the warning message such as + When <constant>CONFIG_SND_DEBUG</constant>, is set, if the + expression is non-zero, it shows the warning message such as <computeroutput>BUG? (xxx)</computeroutput> - normally followed by stack trace. It returns the evaluated - value. - When no <constant>CONFIG_SND_DEBUG</constant> is set, this - macro always returns zero. + normally followed by stack trace. + + In both cases it returns the evaluated value. </para> </section> diff --git a/Documentation/DocBook/writing_musb_glue_layer.tmpl b/Documentation/DocBook/writing_musb_glue_layer.tmpl new file mode 100644 index 00000000000..837eca77f27 --- /dev/null +++ b/Documentation/DocBook/writing_musb_glue_layer.tmpl @@ -0,0 +1,873 @@ +<?xml version="1.0" encoding="UTF-8"?> +<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN" + "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" []> + +<book id="Writing-MUSB-Glue-Layer"> + <bookinfo> + <title>Writing an MUSB Glue Layer</title> + + <authorgroup> + <author> + <firstname>Apelete</firstname> + <surname>Seketeli</surname> + <affiliation> + <address> + <email>apelete at seketeli.net</email> + </address> + </affiliation> + </author> + </authorgroup> + + <copyright> + <year>2014</year> + <holder>Apelete Seketeli</holder> + </copyright> + + <legalnotice> + <para> + This documentation is free software; you can redistribute it + and/or modify it under the terms of the GNU General Public + License as published by the Free Software Foundation; either + version 2 of the License, or (at your option) any later version. + </para> + + <para> + This documentation is distributed in the hope that it will be + useful, but WITHOUT ANY WARRANTY; without even the implied + warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + See the GNU General Public License for more details. + </para> + + <para> + You should have received a copy of the GNU General Public License + along with this documentation; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA + </para> + + <para> + For more details see the file COPYING in the Linux kernel source + tree. + </para> + </legalnotice> + </bookinfo> + +<toc></toc> + + <chapter id="introduction"> + <title>Introduction</title> + <para> + The Linux MUSB subsystem is part of the larger Linux USB + subsystem. It provides support for embedded USB Device Controllers + (UDC) that do not use Universal Host Controller Interface (UHCI) + or Open Host Controller Interface (OHCI). + </para> + <para> + Instead, these embedded UDC rely on the USB On-the-Go (OTG) + specification which they implement at least partially. The silicon + reference design used in most cases is the Multipoint USB + Highspeed Dual-Role Controller (MUSB HDRC) found in the Mentor + Graphics Inventra™ design. + </para> + <para> + As a self-taught exercise I have written an MUSB glue layer for + the Ingenic JZ4740 SoC, modelled after the many MUSB glue layers + in the kernel source tree. This layer can be found at + drivers/usb/musb/jz4740.c. In this documentation I will walk + through the basics of the jz4740.c glue layer, explaining the + different pieces and what needs to be done in order to write your + own device glue layer. + </para> + </chapter> + + <chapter id="linux-musb-basics"> + <title>Linux MUSB Basics</title> + <para> + To get started on the topic, please read USB On-the-Go Basics (see + Resources) which provides an introduction of USB OTG operation at + the hardware level. A couple of wiki pages by Texas Instruments + and Analog Devices also provide an overview of the Linux kernel + MUSB configuration, albeit focused on some specific devices + provided by these companies. Finally, getting acquainted with the + USB specification at USB home page may come in handy, with + practical instance provided through the Writing USB Device Drivers + documentation (again, see Resources). + </para> + <para> + Linux USB stack is a layered architecture in which the MUSB + controller hardware sits at the lowest. The MUSB controller driver + abstract the MUSB controller hardware to the Linux USB stack. + </para> + <programlisting> + ------------------------ + | | <------- drivers/usb/gadget + | Linux USB Core Stack | <------- drivers/usb/host + | | <------- drivers/usb/core + ------------------------ + ⬍ + -------------------------- + | | <------ drivers/usb/musb/musb_gadget.c + | MUSB Controller driver | <------ drivers/usb/musb/musb_host.c + | | <------ drivers/usb/musb/musb_core.c + -------------------------- + ⬍ + --------------------------------- + | MUSB Platform Specific Driver | + | | <-- drivers/usb/musb/jz4740.c + | aka "Glue Layer" | + --------------------------------- + ⬍ + --------------------------------- + | MUSB Controller Hardware | + --------------------------------- + </programlisting> + <para> + As outlined above, the glue layer is actually the platform + specific code sitting in between the controller driver and the + controller hardware. + </para> + <para> + Just like a Linux USB driver needs to register itself with the + Linux USB subsystem, the MUSB glue layer needs first to register + itself with the MUSB controller driver. This will allow the + controller driver to know about which device the glue layer + supports and which functions to call when a supported device is + detected or released; remember we are talking about an embedded + controller chip here, so no insertion or removal at run-time. + </para> + <para> + All of this information is passed to the MUSB controller driver + through a platform_driver structure defined in the glue layer as: + </para> + <programlisting linenumbering="numbered"> +static struct platform_driver jz4740_driver = { + .probe = jz4740_probe, + .remove = jz4740_remove, + .driver = { + .name = "musb-jz4740", + }, +}; + </programlisting> + <para> + The probe and remove function pointers are called when a matching + device is detected and, respectively, released. The name string + describes the device supported by this glue layer. In the current + case it matches a platform_device structure declared in + arch/mips/jz4740/platform.c. Note that we are not using device + tree bindings here. + </para> + <para> + In order to register itself to the controller driver, the glue + layer goes through a few steps, basically allocating the + controller hardware resources and initialising a couple of + circuits. To do so, it needs to keep track of the information used + throughout these steps. This is done by defining a private + jz4740_glue structure: + </para> + <programlisting linenumbering="numbered"> +struct jz4740_glue { + struct device *dev; + struct platform_device *musb; + struct clk *clk; +}; + </programlisting> + <para> + The dev and musb members are both device structure variables. The + first one holds generic information about the device, since it's + the basic device structure, and the latter holds information more + closely related to the subsystem the device is registered to. The + clk variable keeps information related to the device clock + operation. + </para> + <para> + Let's go through the steps of the probe function that leads the + glue layer to register itself to the controller driver. + </para> + <para> + N.B.: For the sake of readability each function will be split in + logical parts, each part being shown as if it was independent from + the others. + </para> + <programlisting linenumbering="numbered"> +static int jz4740_probe(struct platform_device *pdev) +{ + struct platform_device *musb; + struct jz4740_glue *glue; + struct clk *clk; + int ret; + + glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL); + if (!glue) + return -ENOMEM; + + musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO); + if (!musb) { + dev_err(&pdev->dev, "failed to allocate musb device\n"); + return -ENOMEM; + } + + clk = devm_clk_get(&pdev->dev, "udc"); + if (IS_ERR(clk)) { + dev_err(&pdev->dev, "failed to get clock\n"); + ret = PTR_ERR(clk); + goto err_platform_device_put; + } + + ret = clk_prepare_enable(clk); + if (ret) { + dev_err(&pdev->dev, "failed to enable clock\n"); + goto err_platform_device_put; + } + + musb->dev.parent = &pdev->dev; + + glue->dev = &pdev->dev; + glue->musb = musb; + glue->clk = clk; + + return 0; + +err_platform_device_put: + platform_device_put(musb); + return ret; +} + </programlisting> + <para> + The first few lines of the probe function allocate and assign the + glue, musb and clk variables. The GFP_KERNEL flag (line 8) allows + the allocation process to sleep and wait for memory, thus being + usable in a blocking situation. The PLATFORM_DEVID_AUTO flag (line + 12) allows automatic allocation and management of device IDs in + order to avoid device namespace collisions with explicit IDs. With + devm_clk_get() (line 18) the glue layer allocates the clock -- the + <literal>devm_</literal> prefix indicates that clk_get() is + managed: it automatically frees the allocated clock resource data + when the device is released -- and enable it. + </para> + <para> + Then comes the registration steps: + </para> + <programlisting linenumbering="numbered"> +static int jz4740_probe(struct platform_device *pdev) +{ + struct musb_hdrc_platform_data *pdata = &jz4740_musb_platform_data; + + pdata->platform_ops = &jz4740_musb_ops; + + platform_set_drvdata(pdev, glue); + + ret = platform_device_add_resources(musb, pdev->resource, + pdev->num_resources); + if (ret) { + dev_err(&pdev->dev, "failed to add resources\n"); + goto err_clk_disable; + } + + ret = platform_device_add_data(musb, pdata, sizeof(*pdata)); + if (ret) { + dev_err(&pdev->dev, "failed to add platform_data\n"); + goto err_clk_disable; + } + + return 0; + +err_clk_disable: + clk_disable_unprepare(clk); +err_platform_device_put: + platform_device_put(musb); + return ret; +} + </programlisting> + <para> + The first step is to pass the device data privately held by the + glue layer on to the controller driver through + platform_set_drvdata() (line 7). Next is passing on the device + resources information, also privately held at that point, through + platform_device_add_resources() (line 9). + </para> + <para> + Finally comes passing on the platform specific data to the + controller driver (line 16). Platform data will be discussed in + <link linkend="device-platform-data">Chapter 4</link>, but here + we are looking at the platform_ops function pointer (line 5) in + musb_hdrc_platform_data structure (line 3). This function + pointer allows the MUSB controller driver to know which function + to call for device operation: + </para> + <programlisting linenumbering="numbered"> +static const struct musb_platform_ops jz4740_musb_ops = { + .init = jz4740_musb_init, + .exit = jz4740_musb_exit, +}; + </programlisting> + <para> + Here we have the minimal case where only init and exit functions + are called by the controller driver when needed. Fact is the + JZ4740 MUSB controller is a basic controller, lacking some + features found in other controllers, otherwise we may also have + pointers to a few other functions like a power management function + or a function to switch between OTG and non-OTG modes, for + instance. + </para> + <para> + At that point of the registration process, the controller driver + actually calls the init function: + </para> + <programlisting linenumbering="numbered"> +static int jz4740_musb_init(struct musb *musb) +{ + musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2); + if (!musb->xceiv) { + pr_err("HS UDC: no transceiver configured\n"); + return -ENODEV; + } + + /* Silicon does not implement ConfigData register. + * Set dyn_fifo to avoid reading EP config from hardware. + */ + musb->dyn_fifo = true; + + musb->isr = jz4740_musb_interrupt; + + return 0; +} + </programlisting> + <para> + The goal of jz4740_musb_init() is to get hold of the transceiver + driver data of the MUSB controller hardware and pass it on to the + MUSB controller driver, as usual. The transceiver is the circuitry + inside the controller hardware responsible for sending/receiving + the USB data. Since it is an implementation of the physical layer + of the OSI model, the transceiver is also referred to as PHY. + </para> + <para> + Getting hold of the MUSB PHY driver data is done with + usb_get_phy() which returns a pointer to the structure + containing the driver instance data. The next couple of + instructions (line 12 and 14) are used as a quirk and to setup + IRQ handling respectively. Quirks and IRQ handling will be + discussed later in <link linkend="device-quirks">Chapter + 5</link> and <link linkend="handling-irqs">Chapter 3</link>. + </para> + <programlisting linenumbering="numbered"> +static int jz4740_musb_exit(struct musb *musb) +{ + usb_put_phy(musb->xceiv); + + return 0; +} + </programlisting> + <para> + Acting as the counterpart of init, the exit function releases the + MUSB PHY driver when the controller hardware itself is about to be + released. + </para> + <para> + Again, note that init and exit are fairly simple in this case due + to the basic set of features of the JZ4740 controller hardware. + When writing an musb glue layer for a more complex controller + hardware, you might need to take care of more processing in those + two functions. + </para> + <para> + Returning from the init function, the MUSB controller driver jumps + back into the probe function: + </para> + <programlisting linenumbering="numbered"> +static int jz4740_probe(struct platform_device *pdev) +{ + ret = platform_device_add(musb); + if (ret) { + dev_err(&pdev->dev, "failed to register musb device\n"); + goto err_clk_disable; + } + + return 0; + +err_clk_disable: + clk_disable_unprepare(clk); +err_platform_device_put: + platform_device_put(musb); + return ret; +} + </programlisting> + <para> + This is the last part of the device registration process where the + glue layer adds the controller hardware device to Linux kernel + device hierarchy: at this stage, all known information about the + device is passed on to the Linux USB core stack. + </para> + <programlisting linenumbering="numbered"> +static int jz4740_remove(struct platform_device *pdev) +{ + struct jz4740_glue *glue = platform_get_drvdata(pdev); + + platform_device_unregister(glue->musb); + clk_disable_unprepare(glue->clk); + + return 0; +} + </programlisting> + <para> + Acting as the counterpart of probe, the remove function unregister + the MUSB controller hardware (line 5) and disable the clock (line + 6), allowing it to be gated. + </para> + </chapter> + + <chapter id="handling-irqs"> + <title>Handling IRQs</title> + <para> + Additionally to the MUSB controller hardware basic setup and + registration, the glue layer is also responsible for handling the + IRQs: + </para> + <programlisting linenumbering="numbered"> +static irqreturn_t jz4740_musb_interrupt(int irq, void *__hci) +{ + unsigned long flags; + irqreturn_t retval = IRQ_NONE; + struct musb *musb = __hci; + + spin_lock_irqsave(&musb->lock, flags); + + musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB); + musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX); + musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX); + + /* + * The controller is gadget only, the state of the host mode IRQ bits is + * undefined. Mask them to make sure that the musb driver core will + * never see them set + */ + musb->int_usb &= MUSB_INTR_SUSPEND | MUSB_INTR_RESUME | + MUSB_INTR_RESET | MUSB_INTR_SOF; + + if (musb->int_usb || musb->int_tx || musb->int_rx) + retval = musb_interrupt(musb); + + spin_unlock_irqrestore(&musb->lock, flags); + + return retval; +} + </programlisting> + <para> + Here the glue layer mostly has to read the relevant hardware + registers and pass their values on to the controller driver which + will handle the actual event that triggered the IRQ. + </para> + <para> + The interrupt handler critical section is protected by the + spin_lock_irqsave() and counterpart spin_unlock_irqrestore() + functions (line 7 and 24 respectively), which prevent the + interrupt handler code to be run by two different threads at the + same time. + </para> + <para> + Then the relevant interrupt registers are read (line 9 to 11): + </para> + <itemizedlist> + <listitem> + <para> + MUSB_INTRUSB: indicates which USB interrupts are currently + active, + </para> + </listitem> + <listitem> + <para> + MUSB_INTRTX: indicates which of the interrupts for TX + endpoints are currently active, + </para> + </listitem> + <listitem> + <para> + MUSB_INTRRX: indicates which of the interrupts for TX + endpoints are currently active. + </para> + </listitem> + </itemizedlist> + <para> + Note that musb_readb() is used to read 8-bit registers at most, + while musb_readw() allows us to read at most 16-bit registers. + There are other functions that can be used depending on the size + of your device registers. See musb_io.h for more information. + </para> + <para> + Instruction on line 18 is another quirk specific to the JZ4740 + USB device controller, which will be discussed later in <link + linkend="device-quirks">Chapter 5</link>. + </para> + <para> + The glue layer still needs to register the IRQ handler though. + Remember the instruction on line 14 of the init function: + </para> + <programlisting linenumbering="numbered"> +static int jz4740_musb_init(struct musb *musb) +{ + musb->isr = jz4740_musb_interrupt; + + return 0; +} + </programlisting> + <para> + This instruction sets a pointer to the glue layer IRQ handler + function, in order for the controller hardware to call the handler + back when an IRQ comes from the controller hardware. The interrupt + handler is now implemented and registered. + </para> + </chapter> + + <chapter id="device-platform-data"> + <title>Device Platform Data</title> + <para> + In order to write an MUSB glue layer, you need to have some data + describing the hardware capabilities of your controller hardware, + which is called the platform data. + </para> + <para> + Platform data is specific to your hardware, though it may cover a + broad range of devices, and is generally found somewhere in the + arch/ directory, depending on your device architecture. + </para> + <para> + For instance, platform data for the JZ4740 SoC is found in + arch/mips/jz4740/platform.c. In the platform.c file each device of + the JZ4740 SoC is described through a set of structures. + </para> + <para> + Here is the part of arch/mips/jz4740/platform.c that covers the + USB Device Controller (UDC): + </para> + <programlisting linenumbering="numbered"> +/* USB Device Controller */ +struct platform_device jz4740_udc_xceiv_device = { + .name = "usb_phy_gen_xceiv", + .id = 0, +}; + +static struct resource jz4740_udc_resources[] = { + [0] = { + .start = JZ4740_UDC_BASE_ADDR, + .end = JZ4740_UDC_BASE_ADDR + 0x10000 - 1, + .flags = IORESOURCE_MEM, + }, + [1] = { + .start = JZ4740_IRQ_UDC, + .end = JZ4740_IRQ_UDC, + .flags = IORESOURCE_IRQ, + .name = "mc", + }, +}; + +struct platform_device jz4740_udc_device = { + .name = "musb-jz4740", + .id = -1, + .dev = { + .dma_mask = &jz4740_udc_device.dev.coherent_dma_mask, + .coherent_dma_mask = DMA_BIT_MASK(32), + }, + .num_resources = ARRAY_SIZE(jz4740_udc_resources), + .resource = jz4740_udc_resources, +}; + </programlisting> + <para> + The jz4740_udc_xceiv_device platform device structure (line 2) + describes the UDC transceiver with a name and id number. + </para> + <para> + At the time of this writing, note that + "usb_phy_gen_xceiv" is the specific name to be used for + all transceivers that are either built-in with reference USB IP or + autonomous and doesn't require any PHY programming. You will need + to set CONFIG_NOP_USB_XCEIV=y in the kernel configuration to make + use of the corresponding transceiver driver. The id field could be + set to -1 (equivalent to PLATFORM_DEVID_NONE), -2 (equivalent to + PLATFORM_DEVID_AUTO) or start with 0 for the first device of this + kind if we want a specific id number. + </para> + <para> + The jz4740_udc_resources resource structure (line 7) defines the + UDC registers base addresses. + </para> + <para> + The first array (line 9 to 11) defines the UDC registers base + memory addresses: start points to the first register memory + address, end points to the last register memory address and the + flags member defines the type of resource we are dealing with. So + IORESOURCE_MEM is used to define the registers memory addresses. + The second array (line 14 to 17) defines the UDC IRQ registers + addresses. Since there is only one IRQ register available for the + JZ4740 UDC, start and end point at the same address. The + IORESOURCE_IRQ flag tells that we are dealing with IRQ resources, + and the name "mc" is in fact hard-coded in the MUSB core + in order for the controller driver to retrieve this IRQ resource + by querying it by its name. + </para> + <para> + Finally, the jz4740_udc_device platform device structure (line 21) + describes the UDC itself. + </para> + <para> + The "musb-jz4740" name (line 22) defines the MUSB + driver that is used for this device; remember this is in fact + the name that we used in the jz4740_driver platform driver + structure in <link linkend="linux-musb-basics">Chapter + 2</link>. The id field (line 23) is set to -1 (equivalent to + PLATFORM_DEVID_NONE) since we do not need an id for the device: + the MUSB controller driver was already set to allocate an + automatic id in <link linkend="linux-musb-basics">Chapter + 2</link>. In the dev field we care for DMA related information + here. The dma_mask field (line 25) defines the width of the DMA + mask that is going to be used, and coherent_dma_mask (line 26) + has the same purpose but for the alloc_coherent DMA mappings: in + both cases we are using a 32 bits mask. Then the resource field + (line 29) is simply a pointer to the resource structure defined + before, while the num_resources field (line 28) keeps track of + the number of arrays defined in the resource structure (in this + case there were two resource arrays defined before). + </para> + <para> + With this quick overview of the UDC platform data at the arch/ + level now done, let's get back to the MUSB glue layer specific + platform data in drivers/usb/musb/jz4740.c: + </para> + <programlisting linenumbering="numbered"> +static struct musb_hdrc_config jz4740_musb_config = { + /* Silicon does not implement USB OTG. */ + .multipoint = 0, + /* Max EPs scanned, driver will decide which EP can be used. */ + .num_eps = 4, + /* RAMbits needed to configure EPs from table */ + .ram_bits = 9, + .fifo_cfg = jz4740_musb_fifo_cfg, + .fifo_cfg_size = ARRAY_SIZE(jz4740_musb_fifo_cfg), +}; + +static struct musb_hdrc_platform_data jz4740_musb_platform_data = { + .mode = MUSB_PERIPHERAL, + .config = &jz4740_musb_config, +}; + </programlisting> + <para> + First the glue layer configures some aspects of the controller + driver operation related to the controller hardware specifics. + This is done through the jz4740_musb_config musb_hdrc_config + structure. + </para> + <para> + Defining the OTG capability of the controller hardware, the + multipoint member (line 3) is set to 0 (equivalent to false) + since the JZ4740 UDC is not OTG compatible. Then num_eps (line + 5) defines the number of USB endpoints of the controller + hardware, including endpoint 0: here we have 3 endpoints + + endpoint 0. Next is ram_bits (line 7) which is the width of the + RAM address bus for the MUSB controller hardware. This + information is needed when the controller driver cannot + automatically configure endpoints by reading the relevant + controller hardware registers. This issue will be discussed when + we get to device quirks in <link linkend="device-quirks">Chapter + 5</link>. Last two fields (line 8 and 9) are also about device + quirks: fifo_cfg points to the USB endpoints configuration table + and fifo_cfg_size keeps track of the size of the number of + entries in that configuration table. More on that later in <link + linkend="device-quirks">Chapter 5</link>. + </para> + <para> + Then this configuration is embedded inside + jz4740_musb_platform_data musb_hdrc_platform_data structure (line + 11): config is a pointer to the configuration structure itself, + and mode tells the controller driver if the controller hardware + may be used as MUSB_HOST only, MUSB_PERIPHERAL only or MUSB_OTG + which is a dual mode. + </para> + <para> + Remember that jz4740_musb_platform_data is then used to convey + platform data information as we have seen in the probe function + in <link linkend="linux-musb-basics">Chapter 2</link> + </para> + </chapter> + + <chapter id="device-quirks"> + <title>Device Quirks</title> + <para> + Completing the platform data specific to your device, you may also + need to write some code in the glue layer to work around some + device specific limitations. These quirks may be due to some + hardware bugs, or simply be the result of an incomplete + implementation of the USB On-the-Go specification. + </para> + <para> + The JZ4740 UDC exhibits such quirks, some of which we will discuss + here for the sake of insight even though these might not be found + in the controller hardware you are working on. + </para> + <para> + Let's get back to the init function first: + </para> + <programlisting linenumbering="numbered"> +static int jz4740_musb_init(struct musb *musb) +{ + musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2); + if (!musb->xceiv) { + pr_err("HS UDC: no transceiver configured\n"); + return -ENODEV; + } + + /* Silicon does not implement ConfigData register. + * Set dyn_fifo to avoid reading EP config from hardware. + */ + musb->dyn_fifo = true; + + musb->isr = jz4740_musb_interrupt; + + return 0; +} + </programlisting> + <para> + Instruction on line 12 helps the MUSB controller driver to work + around the fact that the controller hardware is missing registers + that are used for USB endpoints configuration. + </para> + <para> + Without these registers, the controller driver is unable to read + the endpoints configuration from the hardware, so we use line 12 + instruction to bypass reading the configuration from silicon, and + rely on a hard-coded table that describes the endpoints + configuration instead: + </para> + <programlisting linenumbering="numbered"> +static struct musb_fifo_cfg jz4740_musb_fifo_cfg[] = { +{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, }, +{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, }, +{ .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 64, }, +}; + </programlisting> + <para> + Looking at the configuration table above, we see that each + endpoints is described by three fields: hw_ep_num is the endpoint + number, style is its direction (either FIFO_TX for the controller + driver to send packets in the controller hardware, or FIFO_RX to + receive packets from hardware), and maxpacket defines the maximum + size of each data packet that can be transmitted over that + endpoint. Reading from the table, the controller driver knows that + endpoint 1 can be used to send and receive USB data packets of 512 + bytes at once (this is in fact a bulk in/out endpoint), and + endpoint 2 can be used to send data packets of 64 bytes at once + (this is in fact an interrupt endpoint). + </para> + <para> + Note that there is no information about endpoint 0 here: that one + is implemented by default in every silicon design, with a + predefined configuration according to the USB specification. For + more examples of endpoint configuration tables, see musb_core.c. + </para> + <para> + Let's now get back to the interrupt handler function: + </para> + <programlisting linenumbering="numbered"> +static irqreturn_t jz4740_musb_interrupt(int irq, void *__hci) +{ + unsigned long flags; + irqreturn_t retval = IRQ_NONE; + struct musb *musb = __hci; + + spin_lock_irqsave(&musb->lock, flags); + + musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB); + musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX); + musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX); + + /* + * The controller is gadget only, the state of the host mode IRQ bits is + * undefined. Mask them to make sure that the musb driver core will + * never see them set + */ + musb->int_usb &= MUSB_INTR_SUSPEND | MUSB_INTR_RESUME | + MUSB_INTR_RESET | MUSB_INTR_SOF; + + if (musb->int_usb || musb->int_tx || musb->int_rx) + retval = musb_interrupt(musb); + + spin_unlock_irqrestore(&musb->lock, flags); + + return retval; +} + </programlisting> + <para> + Instruction on line 18 above is a way for the controller driver to + work around the fact that some interrupt bits used for USB host + mode operation are missing in the MUSB_INTRUSB register, thus left + in an undefined hardware state, since this MUSB controller + hardware is used in peripheral mode only. As a consequence, the + glue layer masks these missing bits out to avoid parasite + interrupts by doing a logical AND operation between the value read + from MUSB_INTRUSB and the bits that are actually implemented in + the register. + </para> + <para> + These are only a couple of the quirks found in the JZ4740 USB + device controller. Some others were directly addressed in the MUSB + core since the fixes were generic enough to provide a better + handling of the issues for others controller hardware eventually. + </para> + </chapter> + + <chapter id="conclusion"> + <title>Conclusion</title> + <para> + Writing a Linux MUSB glue layer should be a more accessible task, + as this documentation tries to show the ins and outs of this + exercise. + </para> + <para> + The JZ4740 USB device controller being fairly simple, I hope its + glue layer serves as a good example for the curious mind. Used + with the current MUSB glue layers, this documentation should + provide enough guidance to get started; should anything gets out + of hand, the linux-usb mailing list archive is another helpful + resource to browse through. + </para> + </chapter> + + <chapter id="acknowledgements"> + <title>Acknowledgements</title> + <para> + Many thanks to Lars-Peter Clausen and Maarten ter Huurne for + answering my questions while I was writing the JZ4740 glue layer + and for helping me out getting the code in good shape. + </para> + <para> + I would also like to thank the Qi-Hardware community at large for + its cheerful guidance and support. + </para> + </chapter> + + <chapter id="resources"> + <title>Resources</title> + <para> + USB Home Page: + <ulink url="http://www.usb.org">http://www.usb.org</ulink> + </para> + <para> + linux-usb Mailing List Archives: + <ulink url="http://marc.info/?l=linux-usb">http://marc.info/?l=linux-usb</ulink> + </para> + <para> + USB On-the-Go Basics: + <ulink url="http://www.maximintegrated.com/app-notes/index.mvp/id/1822">http://www.maximintegrated.com/app-notes/index.mvp/id/1822</ulink> + </para> + <para> + Writing USB Device Drivers: + <ulink url="https://www.kernel.org/doc/htmldocs/writing_usb_driver/index.html">https://www.kernel.org/doc/htmldocs/writing_usb_driver/index.html</ulink> + </para> + <para> + Texas Instruments USB Configuration Wiki Page: + <ulink url="http://processors.wiki.ti.com/index.php/Usbgeneralpage">http://processors.wiki.ti.com/index.php/Usbgeneralpage</ulink> + </para> + <para> + Analog Devices Blackfin MUSB Configuration: + <ulink url="http://docs.blackfin.uclinux.org/doku.php?id=linux-kernel:drivers:musb">http://docs.blackfin.uclinux.org/doku.php?id=linux-kernel:drivers:musb</ulink> + </para> + </chapter> + +</book> diff --git a/Documentation/DocBook/writing_usb_driver.tmpl b/Documentation/DocBook/writing_usb_driver.tmpl index eeff19ca831..3210dcf741c 100644 --- a/Documentation/DocBook/writing_usb_driver.tmpl +++ b/Documentation/DocBook/writing_usb_driver.tmpl @@ -83,7 +83,7 @@ </para> <para> Because each different protocol causes a new driver to be created, I have - written a generic USB driver skeleton, modeled after the pci-skeleton.c + written a generic USB driver skeleton, modelled after the pci-skeleton.c file in the kernel source tree upon which many PCI network drivers have been based. This USB skeleton can be found at drivers/usb/usb-skeleton.c in the kernel source tree. In this article I will walk through the basics @@ -342,7 +342,7 @@ static inline void skel_delete (struct usb_skel *dev) { kfree (dev->bulk_in_buffer); if (dev->bulk_out_buffer != NULL) - usb_buffer_free (dev->udev, dev->bulk_out_size, + usb_free_coherent (dev->udev, dev->bulk_out_size, dev->bulk_out_buffer, dev->write_urb->transfer_dma); usb_free_urb (dev->write_urb); |
