diff options
Diffstat (limited to 'Documentation')
86 files changed, 1069 insertions, 600 deletions
diff --git a/Documentation/DocBook/media/constraints.png.b64 b/Documentation/DocBook/media/constraints.png.b64 new file mode 100644 index 00000000000..125b4a94962 --- /dev/null +++ b/Documentation/DocBook/media/constraints.png.b64 @@ -0,0 +1,59 @@ +iVBORw0KGgoAAAANSUhEUgAAAlQAAAFYCAYAAACVsmLPAAAAAXNSR0IArs4c6QAAAAZiS0dEAP8A +/wD/oL2nkwAAAAlwSFlzAAAOxAAADsQBlSsOGwAAAAd0SU1FB9sLCBIAKVtZsMAAAAxxSURBVHja +7d3ZbqvIAkDRLsv//8v0QytXvpYZap7Wko56OAnE2AXbBSbhOI7jHwAAkr1sAgAAQQUAIKgAAAQV +AICgAgBAUAEACCoAAEEFACCoAAAQVAAAzb2jvyMEWw0AmFvh37xnhgoAQFABAPT1zvruwtNlAADV +VLxsyQwVAICgAgAQVAAAggoAQFABACCoYEohuFkugKACsmLq178DIKiAyJgSVQCCCigQU6IKQFAB +BWJKVAEIKqBgKIkqAEEFFAgkUQUgqIACYSSqAAQViKkwxjIAEFSwbUyJKgBBBWJq8GUCIKhgm5gS +VQCCCsSUqAIQVMBYoSOqAAQVLOk41lwXAIIKhoqqJyFUYhkACCpYMqpiQqjEMgAQVLBUVKWEUIll +ACCoYImoygmhEssAQFDBElHVexkACCoAAEEFACCoAAAQVAAAggoAQFABAAgqAAAEFQCAoAIAEFQA +AIIKAABBBQAgqAAABBUAgKACAOA/b5sAGjsO2wBgMWaoAAAEFQCAoAIAEFQAADtzUXohIQQbAYDi 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+gM7iT/m5BgQA4P+YoQIAEFQAAIIKAEBQAQAIKgAABBUAgKACABBUAAB7+hfHbDX87cMFJQAAAABJ +RU5ErkJggg== diff --git a/Documentation/DocBook/media/dvb/dvbproperty.xml b/Documentation/DocBook/media/dvb/dvbproperty.xml index 3bc8a61efe3..ffee1fbbc00 100644 --- a/Documentation/DocBook/media/dvb/dvbproperty.xml +++ b/Documentation/DocBook/media/dvb/dvbproperty.xml @@ -334,9 +334,10 @@ typedef enum fe_rolloff { <title>fe_delivery_system type</title> <para>Possible values: </para> <programlisting> + typedef enum fe_delivery_system { SYS_UNDEFINED, - SYS_DVBC_ANNEX_AC, + SYS_DVBC_ANNEX_A, SYS_DVBC_ANNEX_B, SYS_DVBT, SYS_DSS, @@ -353,6 +354,7 @@ typedef enum fe_delivery_system { SYS_DAB, SYS_DVBT2, SYS_TURBO, + SYS_DVBC_ANNEX_C, } fe_delivery_system_t; </programlisting> </section> @@ -647,6 +649,18 @@ typedef enum fe_hierarchy { many data types via a single multiplex. The API will soon support this at which point this section will be expanded.</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> <section id="frontend-property-terrestrial-systems"> <title>Properties used on terrestrial delivery systems</title> @@ -767,7 +781,8 @@ typedef enum fe_hierarchy { <title>Properties used on cable delivery systems</title> <section id="dvbc-params"> <title>DVB-C delivery system</title> - <para>The DVB-C Annex-A/C is the widely used cable standard. Transmission uses QAM modulation.</para> + <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> diff --git a/Documentation/DocBook/media/dvb/frontend.xml b/Documentation/DocBook/media/dvb/frontend.xml index 61407eaba02..aeaed59d0f1 100644 --- a/Documentation/DocBook/media/dvb/frontend.xml +++ b/Documentation/DocBook/media/dvb/frontend.xml @@ -45,8 +45,8 @@ transmission. The fontend types are given by fe_type_t type, defined as:</para> </row> <row> <entry id="FE_QAM"><constant>FE_QAM</constant></entry> - <entry>For DVB-C annex A/C standard</entry> - <entry><constant>SYS_DVBC_ANNEX_AC</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> @@ -63,6 +63,10 @@ transmission. The fontend types are given by fe_type_t type, defined as:</para> <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"> diff --git a/Documentation/DocBook/media/selection.png.b64 b/Documentation/DocBook/media/selection.png.b64 new file mode 100644 index 00000000000..416186558cb --- /dev/null +++ b/Documentation/DocBook/media/selection.png.b64 @@ -0,0 +1,206 @@ 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+fve61z9792duOTX05e7bkONHyL3tD9CzIreh5f6CWftlo9aORMntzn1Puy9XAKBmr2HDliqSEkHK +7XYTWpx8fmh/gD9+1LhRZ06SfOQLodQEhEe+BN+VYKdc9mtbqCoCAHqVo5/zroJmy5QKqfclV9+x +tr7snvYH6NmPkXe+9nCn1Q6T0AgAiO2LbekjrD3tLKav8lwtErvuPU/KPbKdc/2qVo5diW0+crtd +D+0PkNtfNW7UvQz0tRz0zKdb7Nnu5+2v5YumxPbMlfECALz2tbY+DGTtCbO1PBxky3a21E86eiy2 +PiE4VT+9l/YHKKVIZdHR0s21JyDs/WWjhvmM/CIDAIzouX+3pSpo6fUxfbsSc2nu2c49fdaUUzds +DWy27mOq45dif1K1P0DPslYWbf3VKPXya3uKQ6rt9osMANCDrQ/7qPmhJr3u17uK8b3bnGo/j94F +0Op5BVDSZZqmafObLpdNH55rQcJrBcrWx83HLv/19ak+/Pc+Qn7rdqfc19flbA1+UuwLAGz9rt3R +baFkx/J3H/F+lD59/wPA6T5+96Muv/87pj9VZM6iFGn93mXU8uQGv8gAAAAALShSWQQAcITKokY6 +liqLAKA6eyqLfmg2AADoj2kCANhLWAQAAB0SBgGwl7BohV9kAAAAgJEIi1YIgwAAAICRCIsAAMji +Y6VCGwCo01+aAAAAAIA7lUUAACR10QQA0PZ3+TRN0+Y3XXQBAIDydnRbKNmx1EcEgC76UyqLAAAo +1vkEAOq3KyzSEQAAAADokwmuAQAAAHgQFgEAAADwICwCAAAA4EFYBAAAAMCDsAgAAACAB2ERAAAA +AA/CIgAAAAAehEUAAAAAPAiLAAAAAHgQFgEAAADwICwCAAAA4EFYBAAAAMCDsAgAAACAB2ERAAAA +AA/CIgAAAAAehEUAAAAAPAiLAAAAAHgQFgEAAADwICwCAAAA4EFYBAAAAMCDsAgAAACAB2ERAAAA +AA/CIgAAAAAe/g/10lQlA3JSSwAAAABJRU5ErkJggg== diff --git a/Documentation/DocBook/media/v4l/biblio.xml b/Documentation/DocBook/media/v4l/biblio.xml index afc8a0dd260..cea6fd3ed42 100644 --- a/Documentation/DocBook/media/v4l/biblio.xml +++ b/Documentation/DocBook/media/v4l/biblio.xml @@ -178,11 +178,3 @@ in the frequency range from 87,5 to 108,0 MHz</title> </biblioentry> </bibliography> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "v4l2.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/common.xml b/Documentation/DocBook/media/v4l/common.xml index a86f7a04552..c79278acfb0 100644 --- a/Documentation/DocBook/media/v4l/common.xml +++ b/Documentation/DocBook/media/v4l/common.xml @@ -1168,6 +1168,8 @@ dheight = format.fmt.pix.height; </section> </section> + &sub-selection-api; + <section id="streaming-par"> <title>Streaming Parameters</title> @@ -1195,11 +1197,3 @@ 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> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "v4l2.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/compat.xml b/Documentation/DocBook/media/v4l/compat.xml index b68698f96e7..c736380b464 100644 --- a/Documentation/DocBook/media/v4l/compat.xml +++ b/Documentation/DocBook/media/v4l/compat.xml @@ -1082,7 +1082,7 @@ 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. +/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 @@ -2376,6 +2376,23 @@ that used it. It was originally scheduled for removal in 2.6.35. <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> </orderedlist> </section> @@ -2489,6 +2506,9 @@ ioctls.</para> <listitem> <para>&VIDIOC-CREATE-BUFS; and &VIDIOC-PREPARE-BUF; ioctls.</para> </listitem> + <listitem> + <para>Selection API. <xref linkend="selection-api" /></para> + </listitem> </itemizedlist> </section> @@ -2507,11 +2527,3 @@ interfaces and should not be implemented in new drivers.</para> </itemizedlist> </section> </section> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "v4l2.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/controls.xml b/Documentation/DocBook/media/v4l/controls.xml index 3bc5ee8b2c7..a1be37897ad 100644 --- a/Documentation/DocBook/media/v4l/controls.xml +++ b/Documentation/DocBook/media/v4l/controls.xml @@ -324,12 +324,6 @@ minimum value disables backlight compensation.</entry> (usually a microscope).</entry> </row> <row> - <entry><constant>V4L2_CID_LASTP1</constant></entry> - <entry></entry> - <entry>End of the predefined control IDs (currently -<constant>V4L2_CID_ILLUMINATORS_2</constant> + 1).</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 @@ -345,6 +339,25 @@ 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> @@ -3329,6 +3342,16 @@ interface and may change in the future.</para> <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> </tbody> </entrytbl> </row> @@ -3357,11 +3380,3 @@ interface and may change in the future.</para> </section> </section> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "common.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/dev-capture.xml b/Documentation/DocBook/media/v4l/dev-capture.xml index 2237c661f26..e1c5f9406d6 100644 --- a/Documentation/DocBook/media/v4l/dev-capture.xml +++ b/Documentation/DocBook/media/v4l/dev-capture.xml @@ -108,11 +108,3 @@ linkend="mmap">memory mapping</link> or <link linkend="userp">user pointer</link>) I/O. See <xref linkend="io" /> for details.</para> </section> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "v4l2.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/dev-codec.xml b/Documentation/DocBook/media/v4l/dev-codec.xml index 6e156dc45b9..dca0ecd54dc 100644 --- a/Documentation/DocBook/media/v4l/dev-codec.xml +++ b/Documentation/DocBook/media/v4l/dev-codec.xml @@ -16,11 +16,3 @@ Applications send data to be converted to the driver through a I/O.</para> <para>[to do]</para> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "v4l2.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/dev-effect.xml b/Documentation/DocBook/media/v4l/dev-effect.xml index 9c243beba0e..2350a67c071 100644 --- a/Documentation/DocBook/media/v4l/dev-effect.xml +++ b/Documentation/DocBook/media/v4l/dev-effect.xml @@ -15,11 +15,3 @@ receive the result data either with &func-read; and &func-write; functions, or through the streaming I/O mechanism.</para> <para>[to do]</para> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "v4l2.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/dev-event.xml b/Documentation/DocBook/media/v4l/dev-event.xml index f14ae3fe107..19f4becfae3 100644 --- a/Documentation/DocBook/media/v4l/dev-event.xml +++ b/Documentation/DocBook/media/v4l/dev-event.xml @@ -41,11 +41,3 @@ 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> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "v4l2.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/dev-osd.xml b/Documentation/DocBook/media/v4l/dev-osd.xml index c9a68a2ccd3..479d9433869 100644 --- a/Documentation/DocBook/media/v4l/dev-osd.xml +++ b/Documentation/DocBook/media/v4l/dev-osd.xml @@ -154,11 +154,3 @@ data flow. For more information see <xref linkend="crop" />.</para> however the framebuffer interface of the driver may support the <constant>FBIOBLANK</constant> ioctl.</para> </section> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "v4l2.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/dev-output.xml b/Documentation/DocBook/media/v4l/dev-output.xml index 919e22c5385..9130a3dc788 100644 --- a/Documentation/DocBook/media/v4l/dev-output.xml +++ b/Documentation/DocBook/media/v4l/dev-output.xml @@ -104,11 +104,3 @@ linkend="mmap">memory mapping</link> or <link linkend="userp">user pointer</link>) I/O. See <xref linkend="io" /> for details.</para> </section> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "v4l2.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/dev-overlay.xml b/Documentation/DocBook/media/v4l/dev-overlay.xml index 92513cf7915..40d1d768143 100644 --- a/Documentation/DocBook/media/v4l/dev-overlay.xml +++ b/Documentation/DocBook/media/v4l/dev-overlay.xml @@ -369,11 +369,3 @@ reasons. <!-- video4linux-list@redhat.com on 22 Oct 2002 subject <para>To start or stop the frame buffer overlay applications call the &VIDIOC-OVERLAY; ioctl.</para> </section> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "v4l2.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/dev-radio.xml b/Documentation/DocBook/media/v4l/dev-radio.xml index 73aa90b45b3..3e6ac73b36a 100644 --- a/Documentation/DocBook/media/v4l/dev-radio.xml +++ b/Documentation/DocBook/media/v4l/dev-radio.xml @@ -47,11 +47,3 @@ depending on the selected frequency. The &VIDIOC-G-TUNER; or &VIDIOC-G-MODULATOR; ioctl reports the supported frequency range.</para> </section> - -<!-- -Local Variables: -mode: sgml -sgml-parent-document: "v4l2.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/dev-raw-vbi.xml b/Documentation/DocBook/media/v4l/dev-raw-vbi.xml index c5a70bdfaf2..b788c72c885 100644 --- a/Documentation/DocBook/media/v4l/dev-raw-vbi.xml +++ b/Documentation/DocBook/media/v4l/dev-raw-vbi.xml @@ -337,11 +337,3 @@ an &EBUSY; if the required hardware resources are temporarily unavailable, for example the device is already in use by another process.</para> </section> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "v4l2.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/dev-rds.xml b/Documentation/DocBook/media/v4l/dev-rds.xml index 2427f54397e..38883a419e6 100644 --- a/Documentation/DocBook/media/v4l/dev-rds.xml +++ b/Documentation/DocBook/media/v4l/dev-rds.xml @@ -29,10 +29,10 @@ 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_SUB_RDS_BLOCK_IO</constant> flag has to be +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_SUB_RDS_CONTROLS</constant> has also been +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> @@ -52,9 +52,9 @@ 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_SUB_RDS_BLOCK_IO</constant> flag has to be set. If the +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_SUB_RDS_CONTROLS</constant> should be set, +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> @@ -194,11 +194,3 @@ as follows:</para> </tgroup> </table> </section> - -<!-- -Local Variables: -mode: sgml -sgml-parent-document: "v4l2.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/dev-sliced-vbi.xml b/Documentation/DocBook/media/v4l/dev-sliced-vbi.xml index 69e789fa7f7..548f8ea28de 100644 --- a/Documentation/DocBook/media/v4l/dev-sliced-vbi.xml +++ b/Documentation/DocBook/media/v4l/dev-sliced-vbi.xml @@ -697,12 +697,3 @@ Sliced VBI services</link> for a description of the line payload.</entry> </section> </section> - - -<!-- -Local Variables: -mode: sgml -sgml-parent-document: "v4l2.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/dev-teletext.xml b/Documentation/DocBook/media/v4l/dev-teletext.xml index 414b1cfff9f..bd21c64d70f 100644 --- a/Documentation/DocBook/media/v4l/dev-teletext.xml +++ b/Documentation/DocBook/media/v4l/dev-teletext.xml @@ -27,11 +27,3 @@ 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> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "v4l2.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/driver.xml b/Documentation/DocBook/media/v4l/driver.xml index 1f7eea5c4ec..eacafe312cd 100644 --- a/Documentation/DocBook/media/v4l/driver.xml +++ b/Documentation/DocBook/media/v4l/driver.xml @@ -198,11 +198,3 @@ devices with the videodev module.</para> <para>to do</para> </section> --> - -<!-- -Local Variables: -mode: sgml -sgml-parent-document: "v4l2.sgml" -indent-tabs-mode: nil -End: ---> diff --git a/Documentation/DocBook/media/v4l/func-close.xml b/Documentation/DocBook/media/v4l/func-close.xml index dfb41cbbbec..232920d2f3c 100644 --- a/Documentation/DocBook/media/v4l/func-close.xml +++ b/Documentation/DocBook/media/v4l/func-close.xml @@ -60,11 +60,3 @@ descriptor.</para> </variablelist> </refsect1> </refentry> - -<!-- -Local Variables: -mode: sgml -sgml-parent-document: "v4l2.sgml" -indent-tabs-mode: nil -End: ---> diff --git a/Documentation/DocBook/media/v4l/func-ioctl.xml b/Documentation/DocBook/media/v4l/func-ioctl.xml index 2de64be706f..4394184a1a6 100644 --- a/Documentation/DocBook/media/v4l/func-ioctl.xml +++ b/Documentation/DocBook/media/v4l/func-ioctl.xml @@ -69,11 +69,3 @@ their respective function and parameters are specified in <xref the parameter remains unmodified.</para> </refsect1> </refentry> - -<!-- -Local Variables: -mode: sgml -sgml-parent-document: "v4l2.sgml" -indent-tabs-mode: nil -End: ---> diff --git a/Documentation/DocBook/media/v4l/func-mmap.xml b/Documentation/DocBook/media/v4l/func-mmap.xml index 786732b64bb..f31ad71bf30 100644 --- a/Documentation/DocBook/media/v4l/func-mmap.xml +++ b/Documentation/DocBook/media/v4l/func-mmap.xml @@ -181,11 +181,3 @@ complete the request.</para> </variablelist> </refsect1> </refentry> - -<!-- -Local Variables: -mode: sgml -sgml-parent-document: "v4l2.sgml" -indent-tabs-mode: nil -End: ---> diff --git a/Documentation/DocBook/media/v4l/func-munmap.xml b/Documentation/DocBook/media/v4l/func-munmap.xml index e2c4190f9bb..860d49ca54a 100644 --- a/Documentation/DocBook/media/v4l/func-munmap.xml +++ b/Documentation/DocBook/media/v4l/func-munmap.xml @@ -74,11 +74,3 @@ mapped yet.</para> </variablelist> </refsect1> </refentry> - -<!-- -Local Variables: -mode: sgml -sgml-parent-document: "v4l2.sgml" -indent-tabs-mode: nil -End: ---> diff --git a/Documentation/DocBook/media/v4l/func-open.xml b/Documentation/DocBook/media/v4l/func-open.xml index 7595d07a8c7..cf64e207c3e 100644 --- a/Documentation/DocBook/media/v4l/func-open.xml +++ b/Documentation/DocBook/media/v4l/func-open.xml @@ -111,11 +111,3 @@ system has been reached.</para> </variablelist> </refsect1> </refentry> - -<!-- -Local Variables: -mode: sgml -sgml-parent-document: "v4l2.sgml" -indent-tabs-mode: nil -End: ---> diff --git a/Documentation/DocBook/media/v4l/func-poll.xml b/Documentation/DocBook/media/v4l/func-poll.xml index ec3c718f596..85cad8bff5b 100644 --- a/Documentation/DocBook/media/v4l/func-poll.xml +++ b/Documentation/DocBook/media/v4l/func-poll.xml @@ -117,11 +117,3 @@ than <constant>OPEN_MAX</constant>.</para> </variablelist> </refsect1> </refentry> - -<!-- -Local Variables: -mode: sgml -sgml-parent-document: "v4l2.sgml" -indent-tabs-mode: nil -End: ---> diff --git a/Documentation/DocBook/media/v4l/func-read.xml b/Documentation/DocBook/media/v4l/func-read.xml index a5089bf8873..e218bbfbd36 100644 --- a/Documentation/DocBook/media/v4l/func-read.xml +++ b/Documentation/DocBook/media/v4l/func-read.xml @@ -179,11 +179,3 @@ type of device.</para> </variablelist> </refsect1> </refentry> - -<!-- -Local Variables: -mode: sgml -sgml-parent-document: "v4l2.sgml" -indent-tabs-mode: nil -End: ---> diff --git a/Documentation/DocBook/media/v4l/func-select.xml b/Documentation/DocBook/media/v4l/func-select.xml index b6713623181..e12a60d9bd8 100644 --- a/Documentation/DocBook/media/v4l/func-select.xml +++ b/Documentation/DocBook/media/v4l/func-select.xml @@ -128,11 +128,3 @@ zero or greater than <constant>FD_SETSIZE</constant>.</para> </variablelist> </refsect1> </refentry> - -<!-- -Local Variables: -mode: sgml -sgml-parent-document: "v4l2.sgml" -indent-tabs-mode: nil -End: ---> diff --git a/Documentation/DocBook/media/v4l/func-write.xml b/Documentation/DocBook/media/v4l/func-write.xml index 2c09c09371c..57520788572 100644 --- a/Documentation/DocBook/media/v4l/func-write.xml +++ b/Documentation/DocBook/media/v4l/func-write.xml @@ -126,11 +126,3 @@ type of device.</para> </variablelist> </refsect1> </refentry> - -<!-- -Local Variables: -mode: sgml -sgml-parent-document: "v4l2.sgml" -indent-tabs-mode: nil -End: ---> diff --git a/Documentation/DocBook/media/v4l/io.xml b/Documentation/DocBook/media/v4l/io.xml index 3f47df1aa54..b815929b5bb 100644 --- a/Documentation/DocBook/media/v4l/io.xml +++ b/Documentation/DocBook/media/v4l/io.xml @@ -1282,11 +1282,3 @@ line, top field first. The bottom field is transmitted first.</entry> </mediaobject> </figure> </section> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "v4l2.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/libv4l.xml b/Documentation/DocBook/media/v4l/libv4l.xml index 3cb10ec5192..d3b71e20003 100644 --- a/Documentation/DocBook/media/v4l/libv4l.xml +++ b/Documentation/DocBook/media/v4l/libv4l.xml @@ -158,10 +158,3 @@ still don't use libv4l.</para> </section> </section> -<!-- -Local Variables: -mode: sgml -sgml-parent-document: "v4l2.sgml" -indent-tabs-mode: nil -End: ---> diff --git a/Documentation/DocBook/media/v4l/pixfmt-grey.xml b/Documentation/DocBook/media/v4l/pixfmt-grey.xml index 3b72bc6b2de..bee970d3f76 100644 --- a/Documentation/DocBook/media/v4l/pixfmt-grey.xml +++ b/Documentation/DocBook/media/v4l/pixfmt-grey.xml @@ -60,11 +60,3 @@ pixel image</title> </example> </refsect1> </refentry> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "pixfmt.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/pixfmt-m420.xml b/Documentation/DocBook/media/v4l/pixfmt-m420.xml index ce4bc019e5c..aadae92c5d0 100644 --- a/Documentation/DocBook/media/v4l/pixfmt-m420.xml +++ b/Documentation/DocBook/media/v4l/pixfmt-m420.xml @@ -137,11 +137,3 @@ pixel image</title> </example> </refsect1> </refentry> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "pixfmt.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/pixfmt-nv12.xml b/Documentation/DocBook/media/v4l/pixfmt-nv12.xml index 873f6703518..84dd4fd7cb8 100644 --- a/Documentation/DocBook/media/v4l/pixfmt-nv12.xml +++ b/Documentation/DocBook/media/v4l/pixfmt-nv12.xml @@ -141,11 +141,3 @@ pixel image</title> </example> </refsect1> </refentry> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "pixfmt.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/pixfmt-nv12m.xml b/Documentation/DocBook/media/v4l/pixfmt-nv12m.xml index c9e166d9ded..3fd3ce5df27 100644 --- a/Documentation/DocBook/media/v4l/pixfmt-nv12m.xml +++ b/Documentation/DocBook/media/v4l/pixfmt-nv12m.xml @@ -144,11 +144,3 @@ CbCr plane has as many pad bytes after its rows.</para> </example> </refsect1> </refentry> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "pixfmt.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/pixfmt-nv12mt.xml b/Documentation/DocBook/media/v4l/pixfmt-nv12mt.xml index 7a2855a526c..2f82b1da8df 100644 --- a/Documentation/DocBook/media/v4l/pixfmt-nv12mt.xml +++ b/Documentation/DocBook/media/v4l/pixfmt-nv12mt.xml @@ -64,11 +64,3 @@ layout of macroblocks</title> </example> </refsect1> </refentry> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "pixfmt.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/pixfmt-nv16.xml b/Documentation/DocBook/media/v4l/pixfmt-nv16.xml index 26094035fc0..8ae1f8a810d 100644 --- a/Documentation/DocBook/media/v4l/pixfmt-nv16.xml +++ b/Documentation/DocBook/media/v4l/pixfmt-nv16.xml @@ -164,11 +164,3 @@ pixel image</title> </example> </refsect1> </refentry> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "pixfmt.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/pixfmt-packed-rgb.xml b/Documentation/DocBook/media/v4l/pixfmt-packed-rgb.xml index 4db272b8a0d..166c8d65e4f 100644 --- a/Documentation/DocBook/media/v4l/pixfmt-packed-rgb.xml +++ b/Documentation/DocBook/media/v4l/pixfmt-packed-rgb.xml @@ -428,8 +428,11 @@ colorspace <constant>V4L2_COLORSPACE_SRGB</constant>.</para> <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> +<link linkend="overlay">Video Overlay</link> or <link linkend="osd"> +Video Output Overlay</link> or when 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 @@ -930,11 +933,3 @@ See &v4l-dvb; for access instructions.</para> </refsect1> </refentry> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "pixfmt.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/pixfmt-packed-yuv.xml b/Documentation/DocBook/media/v4l/pixfmt-packed-yuv.xml index 3cab5d0ca75..33fa5a47a86 100644 --- a/Documentation/DocBook/media/v4l/pixfmt-packed-yuv.xml +++ b/Documentation/DocBook/media/v4l/pixfmt-packed-yuv.xml @@ -234,11 +234,3 @@ linkend="osd">Video Output Overlay</link>.</para> </refsect1> </refentry> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "pixfmt.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/pixfmt-sbggr16.xml b/Documentation/DocBook/media/v4l/pixfmt-sbggr16.xml index 519a9efbac1..6494b05d84a 100644 --- a/Documentation/DocBook/media/v4l/pixfmt-sbggr16.xml +++ b/Documentation/DocBook/media/v4l/pixfmt-sbggr16.xml @@ -81,11 +81,3 @@ pixel image</title> </example> </refsect1> </refentry> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "pixfmt.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/pixfmt-sbggr8.xml b/Documentation/DocBook/media/v4l/pixfmt-sbggr8.xml index 5fe84ecc2eb..5eaf2b42d3f 100644 --- a/Documentation/DocBook/media/v4l/pixfmt-sbggr8.xml +++ b/Documentation/DocBook/media/v4l/pixfmt-sbggr8.xml @@ -65,11 +65,3 @@ pixel image</title> </example> </refsect1> </refentry> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "pixfmt.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/pixfmt-sgbrg8.xml b/Documentation/DocBook/media/v4l/pixfmt-sgbrg8.xml index d67a472b088..fee65dca79c 100644 --- a/Documentation/DocBook/media/v4l/pixfmt-sgbrg8.xml +++ b/Documentation/DocBook/media/v4l/pixfmt-sgbrg8.xml @@ -65,11 +65,3 @@ pixel image</title> </example> </refsect1> </refentry> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "pixfmt.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/pixfmt-sgrbg8.xml b/Documentation/DocBook/media/v4l/pixfmt-sgrbg8.xml index 0cdf13b8ac1..19727ab4c75 100644 --- a/Documentation/DocBook/media/v4l/pixfmt-sgrbg8.xml +++ b/Documentation/DocBook/media/v4l/pixfmt-sgrbg8.xml @@ -65,11 +65,3 @@ columns and rows.</para> </example> </refsect1> </refentry> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "pixfmt.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/pixfmt-uyvy.xml b/Documentation/DocBook/media/v4l/pixfmt-uyvy.xml index 816c8d467c1..b1f6801a17f 100644 --- a/Documentation/DocBook/media/v4l/pixfmt-uyvy.xml +++ b/Documentation/DocBook/media/v4l/pixfmt-uyvy.xml @@ -118,11 +118,3 @@ pixel image</title> </example> </refsect1> </refentry> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "pixfmt.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/pixfmt-vyuy.xml b/Documentation/DocBook/media/v4l/pixfmt-vyuy.xml index 61f12a5e68d..82803408b38 100644 --- a/Documentation/DocBook/media/v4l/pixfmt-vyuy.xml +++ b/Documentation/DocBook/media/v4l/pixfmt-vyuy.xml @@ -118,11 +118,3 @@ pixel image</title> </example> </refsect1> </refentry> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "pixfmt.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/pixfmt-y16.xml b/Documentation/DocBook/media/v4l/pixfmt-y16.xml index d5840401507..ff4f727d562 100644 --- a/Documentation/DocBook/media/v4l/pixfmt-y16.xml +++ b/Documentation/DocBook/media/v4l/pixfmt-y16.xml @@ -79,11 +79,3 @@ pixel image</title> </example> </refsect1> </refentry> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "pixfmt.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/pixfmt-y41p.xml b/Documentation/DocBook/media/v4l/pixfmt-y41p.xml index 73c8536efb0..98dcb91d291 100644 --- a/Documentation/DocBook/media/v4l/pixfmt-y41p.xml +++ b/Documentation/DocBook/media/v4l/pixfmt-y41p.xml @@ -147,11 +147,3 @@ pixel image</title> </example> </refsect1> </refentry> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "pixfmt.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/pixfmt-yuv410.xml b/Documentation/DocBook/media/v4l/pixfmt-yuv410.xml index 8eb4a193d77..0869dce5f92 100644 --- a/Documentation/DocBook/media/v4l/pixfmt-yuv410.xml +++ b/Documentation/DocBook/media/v4l/pixfmt-yuv410.xml @@ -131,11 +131,3 @@ pixel image</title> </example> </refsect1> </refentry> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "pixfmt.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/pixfmt-yuv411p.xml b/Documentation/DocBook/media/v4l/pixfmt-yuv411p.xml index 00e0960a986..086dc731bf0 100644 --- a/Documentation/DocBook/media/v4l/pixfmt-yuv411p.xml +++ b/Documentation/DocBook/media/v4l/pixfmt-yuv411p.xml @@ -145,11 +145,3 @@ pixel image</title> </example> </refsect1> </refentry> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "v4l2.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/pixfmt-yuv420.xml b/Documentation/DocBook/media/v4l/pixfmt-yuv420.xml index 42d7de5e456..48649fac159 100644 --- a/Documentation/DocBook/media/v4l/pixfmt-yuv420.xml +++ b/Documentation/DocBook/media/v4l/pixfmt-yuv420.xml @@ -147,11 +147,3 @@ pixel image</title> </example> </refsect1> </refentry> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "pixfmt.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/pixfmt-yuv420m.xml b/Documentation/DocBook/media/v4l/pixfmt-yuv420m.xml index f5d8f57495c..9957863daf1 100644 --- a/Documentation/DocBook/media/v4l/pixfmt-yuv420m.xml +++ b/Documentation/DocBook/media/v4l/pixfmt-yuv420m.xml @@ -152,11 +152,3 @@ pixel image</title> </example> </refsect1> </refentry> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "pixfmt.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/pixfmt-yuv422p.xml b/Documentation/DocBook/media/v4l/pixfmt-yuv422p.xml index 4348bd9f0d0..4ce6463fe0a 100644 --- a/Documentation/DocBook/media/v4l/pixfmt-yuv422p.xml +++ b/Documentation/DocBook/media/v4l/pixfmt-yuv422p.xml @@ -151,11 +151,3 @@ pixel image</title> </example> </refsect1> </refentry> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "pixfmt.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/pixfmt-yuyv.xml b/Documentation/DocBook/media/v4l/pixfmt-yuyv.xml index bdb2ffacbbc..58384092251 100644 --- a/Documentation/DocBook/media/v4l/pixfmt-yuyv.xml +++ b/Documentation/DocBook/media/v4l/pixfmt-yuyv.xml @@ -118,11 +118,3 @@ pixel image</title> </example> </refsect1> </refentry> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "pixfmt.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/pixfmt-yvyu.xml b/Documentation/DocBook/media/v4l/pixfmt-yvyu.xml index 40d17ae39dd..bfffdc76d3d 100644 --- a/Documentation/DocBook/media/v4l/pixfmt-yvyu.xml +++ b/Documentation/DocBook/media/v4l/pixfmt-yvyu.xml @@ -118,11 +118,3 @@ pixel image</title> </example> </refsect1> </refentry> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "pixfmt.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/pixfmt.xml b/Documentation/DocBook/media/v4l/pixfmt.xml index aef4615fb07..31eaae2469f 100644 --- a/Documentation/DocBook/media/v4l/pixfmt.xml +++ b/Documentation/DocBook/media/v4l/pixfmt.xml @@ -891,6 +891,11 @@ kernel sources in the file <filename>Documentation/video4linux/cx2341x/README.hm <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> @@ -998,11 +1003,3 @@ the other bits are set to 0.</entry> </tgroup> </table> </section> - - <!-- -Local Variables: -mode: sgml -sgml-parent-document: "v4l2.sgml" -indent-tabs-mode: nil -End: - --> diff --git a/Documentation/DocBook/media/v4l/selection-api.xml b/Documentation/DocBook/media/v4l/selection-api.xml new file mode 100644 index 00000000000..2f0bdb4d555 --- /dev/null +++ b/Documentation/DocBook/media/v4l/selection-api.xml @@ -0,0 +1,321 @@ +<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> + + <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> + </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-sel-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_ACTIVE +</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_ACTIVE </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-sel-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_ACTIVE </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_ACTIVE </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_ACTIVE </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_ACTIVE </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_ACTIVE +</constant> and <constant> V4L2_SEL_TGT_COMPOSE_ACTIVE </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 <structfield> +&v4l2-pix-format;::bytesperline </structfield>. Introducing an image offsets +could be done by modifying field <structfield> &v4l2-buffer;::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, <structname> &v4l2-crop; +</structname> and <structname> &v4l2-cropcap; </structname> have no reserved +fields. Therefore there is no way to extend their functionality. The new +<structname> &v4l2-selection; </structname> 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_ACTIVE; + 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_ACTIVE; + 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_ACTIVE, + }; + &v4l2-selection; crop = { + .type = V4L2_BUF_TYPE_VIDEO_OUTPUT, + .target = V4L2_SEL_TGT_CROP_ACTIVE, + }; + 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/v4l2.xml b/Documentation/DocBook/media/v4l/v4l2.xml index 2ab365c10fb..e97c512861b 100644 --- a/Documentation/DocBook/media/v4l/v4l2.xml +++ b/Documentation/DocBook/media/v4l/v4l2.xml @@ -501,6 +501,7 @@ and discussions on the V4L mailing list.</revremark> &sub-g-output; &sub-g-parm; &sub-g-priority; + &sub-g-selection; &sub-g-sliced-vbi-cap; &sub-g-std; &sub-g-tuner; diff --git a/Documentation/DocBook/media/v4l/vidioc-enum-dv-presets.xml b/Documentation/DocBook/media/v4l/vidioc-enum-dv-presets.xml index 1d31427edd1..0be17c232d3 100644 --- a/Documentation/DocBook/media/v4l/vidioc-enum-dv-presets.xml +++ b/Documentation/DocBook/media/v4l/vidioc-enum-dv-presets.xml @@ -228,11 +228,3 @@ is out of bounds.</para> </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 index 71d373b6d36..347d142e743 100644 --- a/Documentation/DocBook/media/v4l/vidioc-enum-fmt.xml +++ b/Documentation/DocBook/media/v4l/vidioc-enum-fmt.xml @@ -156,11 +156,3 @@ bounds.</para> </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-enuminput.xml b/Documentation/DocBook/media/v4l/vidioc-enuminput.xml index 476fe1d2bba..9b8efcd6e94 100644 --- a/Documentation/DocBook/media/v4l/vidioc-enuminput.xml +++ b/Documentation/DocBook/media/v4l/vidioc-enuminput.xml @@ -311,11 +311,3 @@ out of bounds.</para> </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-enumoutput.xml b/Documentation/DocBook/media/v4l/vidioc-enumoutput.xml index a281d26a195..a64d5ef103f 100644 --- a/Documentation/DocBook/media/v4l/vidioc-enumoutput.xml +++ b/Documentation/DocBook/media/v4l/vidioc-enumoutput.xml @@ -196,11 +196,3 @@ is out of bounds.</para> </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-enumstd.xml b/Documentation/DocBook/media/v4l/vidioc-enumstd.xml index 95803fe2c8e..3a5fc5405f9 100644 --- a/Documentation/DocBook/media/v4l/vidioc-enumstd.xml +++ b/Documentation/DocBook/media/v4l/vidioc-enumstd.xml @@ -381,11 +381,3 @@ is out of bounds.</para> </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-g-ctrl.xml b/Documentation/DocBook/media/v4l/vidioc-g-ctrl.xml index 5146d00782e..12b1d0503e2 100644 --- a/Documentation/DocBook/media/v4l/vidioc-g-ctrl.xml +++ b/Documentation/DocBook/media/v4l/vidioc-g-ctrl.xml @@ -127,11 +127,3 @@ this control belongs to.</para> </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-g-ext-ctrls.xml b/Documentation/DocBook/media/v4l/vidioc-g-ext-ctrls.xml index 5122ce87e0b..6f1f9a629dc 100644 --- a/Documentation/DocBook/media/v4l/vidioc-g-ext-ctrls.xml +++ b/Documentation/DocBook/media/v4l/vidioc-g-ext-ctrls.xml @@ -312,10 +312,3 @@ to store the payload and this error code is returned.</para> </refsect1> </refentry> -<!-- -Local Variables: -mode: sgml -sgml-parent-document: "v4l2.sgml" -indent-tabs-mode: nil -End: ---> diff --git a/Documentation/DocBook/media/v4l/vidioc-g-fbuf.xml b/Documentation/DocBook/media/v4l/vidioc-g-fbuf.xml index 055718231bc..93817f33703 100644 --- a/Documentation/DocBook/media/v4l/vidioc-g-fbuf.xml +++ b/Documentation/DocBook/media/v4l/vidioc-g-fbuf.xml @@ -295,7 +295,8 @@ set this field to zero.</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.</entry> +non-destructive overlays. Video Output Overlays are in practice always +non-destructive.</entry> </row> <row> <entry><constant>V4L2_FBUF_CAP_CHROMAKEY</constant></entry> @@ -339,8 +340,8 @@ blending makes no sense for destructive overlays.</entry> <row> <entry><constant>V4L2_FBUF_CAP_SRC_CHROMAKEY</constant></entry> <entry>0x0080</entry> - <entry>The device supports Source Chroma-keying. Framebuffer pixels -with the chroma-key colors are replaced by video pixels, which is exactly opposite of + <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> @@ -356,7 +357,9 @@ with the chroma-key colors are replaced by video pixels, which is exactly opposi <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. [?]</entry> +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> @@ -366,9 +369,8 @@ size as the capture. [?]</entry> </row> <row> <entry spanname="hspan">The purpose of -<constant>V4L2_FBUF_FLAG_PRIMARY</constant> and <constant>V4L2_FBUF_FLAG_OVERLAY</constant> was never quite clear. -Most drivers seem to ignore these flags. For compatibility with the +Most drivers seem to ignore this flag. For compatibility with the <wordasword>bttv</wordasword> driver applications should set the <constant>V4L2_FBUF_FLAG_OVERLAY</constant> flag.</entry> </row> diff --git a/Documentation/DocBook/media/v4l/vidioc-g-frequency.xml b/Documentation/DocBook/media/v4l/vidioc-g-frequency.xml index 062d7206909..16431813beb 100644 --- a/Documentation/DocBook/media/v4l/vidioc-g-frequency.xml +++ b/Documentation/DocBook/media/v4l/vidioc-g-frequency.xml @@ -135,11 +135,3 @@ wrong.</para> </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-g-modulator.xml b/Documentation/DocBook/media/v4l/vidioc-g-modulator.xml index 15ce660f0f5..7f4ac7e41fa 100644 --- a/Documentation/DocBook/media/v4l/vidioc-g-modulator.xml +++ b/Documentation/DocBook/media/v4l/vidioc-g-modulator.xml @@ -236,11 +236,3 @@ mode.</entry> </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-g-priority.xml b/Documentation/DocBook/media/v4l/vidioc-g-priority.xml index 8f5e3da7002..6a81b4fe953 100644 --- a/Documentation/DocBook/media/v4l/vidioc-g-priority.xml +++ b/Documentation/DocBook/media/v4l/vidioc-g-priority.xml @@ -133,11 +133,3 @@ priority.</para> </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-g-selection.xml b/Documentation/DocBook/media/v4l/vidioc-g-selection.xml new file mode 100644 index 00000000000..a9d36e0c090 --- /dev/null +++ b/Documentation/DocBook/media/v4l/vidioc-g-selection.xml @@ -0,0 +1,304 @@ +<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 <structfield> +&v4l2-selection;::type </structfield> 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 <structfield> &v4l2-selection;::target </structfield> to value +<constant> V4L2_SEL_TGT_CROP_ACTIVE </constant> (<constant> +V4L2_SEL_TGT_COMPOSE_ACTIVE </constant>). Please refer to table <xref +linkend="v4l2-sel-target" /> or <xref linkend="selection-api" /> for additional +targets. Fields <structfield> &v4l2-selection;::flags </structfield> and +<structfield> &v4l2-selection;::reserved </structfield> 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, structure <structfield> +&v4l2-selection;::r </structfield> 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 <structfield> +&v4l2-selection;::type </structfield> 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 <structfield> &v4l2-selection;::target </structfield> to value +<constant> V4L2_SEL_TGT_CROP_ACTIVE </constant> (<constant> +V4L2_SEL_TGT_COMPOSE_ACTIVE </constant>). Please refer to table <xref +linkend="v4l2-sel-target" /> or <xref linkend="selection-api" /> for additional +targets. Set desired active area into the field <structfield> +&v4l2-selection;::r </structfield>. Field <structfield> +&v4l2-selection;::reserved </structfield> is ignored and must be filled with +zeros. The driver may adjust the rectangle coordinates. An application may +introduce constraints to control rounding behaviour. Set the field +<structfield> &v4l2-selection;::flags </structfield> to one of values: + +<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 <structfield>&v4l2-selection;::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 field <structfield> &v4l2-selection;::r </structfield> 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> + + </refsect1> + + <refsect1> + <table frame="none" pgwide="1" id="v4l2-sel-target"> + <title>Selection targets.</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_SEL_TGT_CROP_ACTIVE</constant></entry> + <entry>0</entry> + <entry>area that is currently cropped by hardware</entry> + </row> + <row> + <entry><constant>V4L2_SEL_TGT_CROP_DEFAULT</constant></entry> + <entry>1</entry> + <entry>suggested cropping rectangle that covers the "whole picture"</entry> + </row> + <row> + <entry><constant>V4L2_SEL_TGT_CROP_BOUNDS</constant></entry> + <entry>2</entry> + <entry>limits for the cropping rectangle</entry> + </row> + <row> + <entry><constant>V4L2_SEL_TGT_COMPOSE_ACTIVE</constant></entry> + <entry>256</entry> + <entry>area to which data are composed by hardware</entry> + </row> + <row> + <entry><constant>V4L2_SEL_TGT_COMPOSE_DEFAULT</constant></entry> + <entry>257</entry> + <entry>suggested composing rectangle that covers the "whole picture"</entry> + </row> + <row> + <entry><constant>V4L2_SEL_TGT_COMPOSE_BOUNDS</constant></entry> + <entry>258</entry> + <entry>limits for the composing rectangle</entry> + </row> + <row> + <entry><constant>V4L2_SEL_TGT_COMPOSE_PADDED</constant></entry> + <entry>259</entry> + <entry>the active area and all padding pixels that are inserted or modified by the hardware</entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <refsect1> + <table frame="none" pgwide="1" id="v4l2-sel-flags"> + <title>Selection constraint flags</title> + <tgroup cols="3"> + &cs-def; + <tbody valign="top"> + <row> + <entry><constant>V4L2_SEL_FLAG_GE</constant></entry> + <entry>0x00000001</entry> + <entry>indicate that adjusted rectangle must contain a rectangle from <structfield>&v4l2-selection;::r</structfield></entry> + </row> + <row> + <entry><constant>V4L2_SEL_FLAG_LE</constant></entry> + <entry>0x00000002</entry> + <entry>indicate that adjusted rectangle must be inside a rectangle from <structfield>&v4l2-selection;::r</structfield></entry> + </row> + </tbody> + </tgroup> + </table> + </refsect1> + + <section> + <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> + </section> + + <refsect1> + <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-sel-target"> cropping and composing rectangles </link></entry> + </row> + <row> + <entry>__u32</entry> + <entry><structfield>flags</structfield></entry> + <entry>control over coordinates adjustments, refer to <link linkend="v4l2-sel-flags">selection flags</link></entry> + </row> + <row> + <entry>&v4l2-rect;</entry> + <entry><structfield>r</structfield></entry> + <entry>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> + </refsect1> + + <refsect1> + &return-value; + <variablelist> + <varlistentry> + <term><errorcode>EINVAL</errorcode></term> + <listitem> + <para>The buffer <structfield> &v4l2-selection;::type </structfield> +or <structfield> &v4l2-selection;::target </structfield> is not supported, or +the <structfield> &v4l2-selection;::flags </structfield> are invalid.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>ERANGE</errorcode></term> + <listitem> + <para>it is not possible to adjust a rectangle <structfield> +&v4l2-selection;::r </structfield> that satisfies all contraints from +<structfield> &v4l2-selection;::flags </structfield>.</para> + </listitem> + </varlistentry> + <varlistentry> + <term><errorcode>EBUSY</errorcode></term> + <listitem> + <para>it is not possible to apply change of 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-std.xml b/Documentation/DocBook/media/v4l/vidioc-g-std.xml index 37996f25b5d..99ff1a01622 100644 --- a/Documentation/DocBook/media/v4l/vidioc-g-std.xml +++ b/Documentation/DocBook/media/v4l/vidioc-g-std.xml @@ -88,11 +88,3 @@ standards.</para> </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-g-tuner.xml b/Documentation/DocBook/media/v4l/vidioc-g-tuner.xml index bd98c734c06..91ec2fb658f 100644 --- a/Documentation/DocBook/media/v4l/vidioc-g-tuner.xml +++ b/Documentation/DocBook/media/v4l/vidioc-g-tuner.xml @@ -318,6 +318,16 @@ standard.</para><!-- FIXME what if PAL+NTSC and Bi but not SAP? --></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> </tbody> </tgroup> </table> @@ -525,11 +535,3 @@ out of bounds.</para> </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-querybuf.xml b/Documentation/DocBook/media/v4l/vidioc-querybuf.xml index 5c104d42d31..6e414d7b6df 100644 --- a/Documentation/DocBook/media/v4l/vidioc-querybuf.xml +++ b/Documentation/DocBook/media/v4l/vidioc-querybuf.xml @@ -100,11 +100,3 @@ supported, or the <structfield>index</structfield> is out of bounds.</para> </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-queryctrl.xml b/Documentation/DocBook/media/v4l/vidioc-queryctrl.xml index 0ac0057a51c..36660d311b5 100644 --- a/Documentation/DocBook/media/v4l/vidioc-queryctrl.xml +++ b/Documentation/DocBook/media/v4l/vidioc-queryctrl.xml @@ -443,11 +443,3 @@ or this particular menu item is not supported by the driver.</para> </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-s-hw-freq-seek.xml b/Documentation/DocBook/media/v4l/vidioc-s-hw-freq-seek.xml index c30dcc4232c..e013da845b1 100644 --- a/Documentation/DocBook/media/v4l/vidioc-s-hw-freq-seek.xml +++ b/Documentation/DocBook/media/v4l/vidioc-s-hw-freq-seek.xml @@ -125,11 +125,3 @@ wrong.</para> </variablelist> </refsect1> </refentry> - -<!-- -Local Variables: -mode: sgml -sgml-parent-document: "v4l2.sgml" -indent-tabs-mode: nil -End: ---> diff --git a/Documentation/dvb/get_dvb_firmware b/Documentation/dvb/get_dvb_firmware index e67be7afc78..d1d4a179a38 100755 --- a/Documentation/dvb/get_dvb_firmware +++ b/Documentation/dvb/get_dvb_firmware @@ -27,8 +27,8 @@ use IO::Handle; "or51211", "or51132_qam", "or51132_vsb", "bluebird", "opera1", "cx231xx", "cx18", "cx23885", "pvrusb2", "mpc718", "af9015", "ngene", "az6027", "lme2510_lg", "lme2510c_s7395", - "lme2510c_s7395_old", "drxk", "drxk_terratec_h5", "tda10071", - "it9135" ); + "lme2510c_s7395_old", "drxk", "drxk_terratec_h5", + "drxk_hauppauge_hvr930c", "tda10071", "it9135", "it9137"); # Check args syntax() if (scalar(@ARGV) != 1); @@ -644,6 +644,24 @@ sub drxk { "$fwfile" } +sub drxk_hauppauge_hvr930c { + my $url = "http://www.wintvcd.co.uk/drivers/"; + my $zipfile = "HVR-9x0_5_10_325_28153_SIGNED.zip"; + my $hash = "83ab82e7e9480ec8bf1ae0155ca63c88"; + my $tmpdir = tempdir(DIR => "/tmp", CLEANUP => 1); + my $drvfile = "HVR-900/emOEM.sys"; + my $fwfile = "dvb-usb-hauppauge-hvr930c-drxk.fw"; + + checkstandard(); + + wgetfile($zipfile, $url . $zipfile); + verify($zipfile, $hash); + unzip($zipfile, $tmpdir); + extract("$tmpdir/$drvfile", 0x117b0, 42692, "$fwfile"); + + "$fwfile" +} + sub drxk_terratec_h5 { my $url = "http://www.linuxtv.org/downloads/firmware/"; my $hash = "19000dada8e2741162ccc50cc91fa7f1"; @@ -658,6 +676,26 @@ sub drxk_terratec_h5 { } sub it9135 { + my $sourcefile = "dvb-usb-it9135.zip"; + my $url = "http://www.ite.com.tw/uploads/firmware/v3.6.0.0/$sourcefile"; + my $hash = "1e55f6c8833f1d0ae067c2bb2953e6a9"; + my $tmpdir = tempdir(DIR => "/tmp", CLEANUP => 0); + my $outfile = "dvb-usb-it9135.fw"; + my $fwfile1 = "dvb-usb-it9135-01.fw"; + my $fwfile2 = "dvb-usb-it9135-02.fw"; + + checkstandard(); + + wgetfile($sourcefile, $url); + unzip($sourcefile, $tmpdir); + verify("$tmpdir/$outfile", $hash); + extract("$tmpdir/$outfile", 64, 8128, "$fwfile1"); + extract("$tmpdir/$outfile", 12866, 5817, "$fwfile2"); + + "$fwfile1 $fwfile2" +} + +sub it9137 { my $url = "http://kworld.server261.com/kworld/CD/ITE_TiVme/V1.00/"; my $zipfile = "Driver_V10.323.1.0412.100412.zip"; my $hash = "79b597dc648698ed6820845c0c9d0d37"; diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt index d49c2ec72d1..d725c0dfe03 100644 --- a/Documentation/feature-removal-schedule.txt +++ b/Documentation/feature-removal-schedule.txt @@ -439,41 +439,6 @@ Who: Jean Delvare <khali@linux-fr.org> ---------------------------- -What: Support for driver specific ioctls in the pwc driver (everything - defined in media/pwc-ioctl.h) -When: 3.3 -Why: This stems from the v4l1 era, with v4l2 everything can be done with - standardized v4l2 API calls -Who: Hans de Goede <hdegoede@redhat.com> - ----------------------------- - -What: Driver specific sysfs API in the pwc driver -When: 3.3 -Why: Setting pan/tilt should be done with v4l2 controls, like with other - cams. The button is available as a standard input device -Who: Hans de Goede <hdegoede@redhat.com> - ----------------------------- - -What: Driver specific use of pixfmt.priv in the pwc driver -When: 3.3 -Why: The .priv field never was intended for this, setting a framerate is - support using the standardized S_PARM ioctl -Who: Hans de Goede <hdegoede@redhat.com> - ----------------------------- - -What: Software emulation of arbritary resolutions in the pwc driver -When: 3.3 -Why: The pwc driver claims to support any resolution between 160x120 - and 640x480, but emulates this by simply drawing a black border - around the image. Userspace can draw its own black border if it - really wants one. -Who: Hans de Goede <hdegoede@redhat.com> - ----------------------------- - What: For VIDIOC_S_FREQUENCY the type field must match the device node's type. If not, return -EINVAL. When: 3.2 diff --git a/Documentation/video4linux/CARDLIST.au0828 b/Documentation/video4linux/CARDLIST.au0828 index d5cb4ea287b..7b59e953c4b 100644 --- a/Documentation/video4linux/CARDLIST.au0828 +++ b/Documentation/video4linux/CARDLIST.au0828 @@ -1,5 +1,5 @@ 0 -> Unknown board (au0828) - 1 -> Hauppauge HVR950Q (au0828) [2040:7200,2040:7210,2040:7217,2040:721b,2040:721e,2040:721f,2040:7280,0fd9:0008] + 1 -> Hauppauge HVR950Q (au0828) [2040:7200,2040:7210,2040:7217,2040:721b,2040:721e,2040:721f,2040:7280,0fd9:0008,2040:7260,2040:7213] 2 -> Hauppauge HVR850 (au0828) [2040:7240] 3 -> DViCO FusionHDTV USB (au0828) [0fe9:d620] 4 -> Hauppauge HVR950Q rev xxF8 (au0828) [2040:7201,2040:7211,2040:7281] diff --git a/Documentation/video4linux/CARDLIST.bttv b/Documentation/video4linux/CARDLIST.bttv index 4739d568430..b753906c718 100644 --- a/Documentation/video4linux/CARDLIST.bttv +++ b/Documentation/video4linux/CARDLIST.bttv @@ -71,7 +71,7 @@ 70 -> Prolink Pixelview PV-BT878P+ (Rev.4C,8E) 71 -> Lifeview FlyVideo 98EZ (capture only) LR51 [1851:1851] 72 -> Prolink Pixelview PV-BT878P+9B (PlayTV Pro rev.9B FM+NICAM) [1554:4011] - 73 -> Sensoray 311 [6000:0311] + 73 -> Sensoray 311/611 [6000:0311,6000:0611] 74 -> RemoteVision MX (RV605) 75 -> Powercolor MTV878/ MTV878R/ MTV878F 76 -> Canopus WinDVR PCI (COMPAQ Presario 3524JP, 5112JP) [0e11:0079] @@ -158,3 +158,4 @@ 157 -> Geovision GV-800(S) (master) [800a:763d] 158 -> Geovision GV-800(S) (slave) [800b:763d,800c:763d,800d:763d] 159 -> ProVideo PV183 [1830:1540,1831:1540,1832:1540,1833:1540,1834:1540,1835:1540,1836:1540,1837:1540] +160 -> Tongwei Video Technology TD-3116 [f200:3116] diff --git a/Documentation/video4linux/CARDLIST.cx23885 b/Documentation/video4linux/CARDLIST.cx23885 index 8910449d23a..23584d0c6a7 100644 --- a/Documentation/video4linux/CARDLIST.cx23885 +++ b/Documentation/video4linux/CARDLIST.cx23885 @@ -29,3 +29,6 @@ 28 -> LEADTEK WinFast PxTV1200 [107d:6f22] 29 -> GoTView X5 3D Hybrid [5654:2390] 30 -> NetUP Dual DVB-T/C-CI RF [1b55:e2e4] + 31 -> Leadtek Winfast PxDVR3200 H XC4000 [107d:6f39] + 32 -> MPX-885 + 33 -> Mygica X8507 [14f1:8502] diff --git a/Documentation/video4linux/CARDLIST.cx88 b/Documentation/video4linux/CARDLIST.cx88 index d9c0f119196..eee18e6962b 100644 --- a/Documentation/video4linux/CARDLIST.cx88 +++ b/Documentation/video4linux/CARDLIST.cx88 @@ -85,3 +85,5 @@ 84 -> Samsung SMT 7020 DVB-S [18ac:dc00,18ac:dccd] 85 -> Twinhan VP-1027 DVB-S [1822:0023] 86 -> TeVii S464 DVB-S/S2 [d464:9022] + 87 -> Leadtek WinFast DTV2000 H PLUS [107d:6f42] + 88 -> Leadtek WinFast DTV1800 H (XC4000) [107d:6f38] diff --git a/Documentation/video4linux/CARDLIST.em28xx b/Documentation/video4linux/CARDLIST.em28xx index 4a7b3df6d8b..e7be3ac49ea 100644 --- a/Documentation/video4linux/CARDLIST.em28xx +++ b/Documentation/video4linux/CARDLIST.em28xx @@ -11,7 +11,7 @@ 10 -> Hauppauge WinTV HVR 900 (em2880) [2040:6500] 11 -> Terratec Hybrid XS (em2880) 12 -> Kworld PVR TV 2800 RF (em2820/em2840) - 13 -> Terratec Prodigy XS (em2880) [0ccd:0047] + 13 -> Terratec Prodigy XS (em2880) 14 -> SIIG AVTuner-PVR / Pixelview Prolink PlayTV USB 2.0 (em2820/em2840) 15 -> V-Gear PocketTV (em2800) 16 -> Hauppauge WinTV HVR 950 (em2883) [2040:6513,2040:6517,2040:651b] @@ -40,7 +40,7 @@ 39 -> KWorld PVRTV 300U (em2861) [eb1a:e300] 40 -> Plextor ConvertX PX-TV100U (em2861) [093b:a005] 41 -> Kworld 350 U DVB-T (em2870) [eb1a:e350] - 42 -> Kworld 355 U DVB-T (em2870) [eb1a:e355,eb1a:e357] + 42 -> Kworld 355 U DVB-T (em2870) [eb1a:e355,eb1a:e357,eb1a:e359] 43 -> Terratec Cinergy T XS (em2870) [0ccd:0043] 44 -> Terratec Cinergy T XS (MT2060) (em2870) 45 -> Pinnacle PCTV DVB-T (em2870) @@ -64,7 +64,7 @@ 64 -> Easy Cap Capture DC-60 (em2860) 65 -> IO-DATA GV-MVP/SZ (em2820/em2840) [04bb:0515] 66 -> Empire dual TV (em2880) - 67 -> Terratec Grabby (em2860) [0ccd:0096] + 67 -> Terratec Grabby (em2860) [0ccd:0096,0ccd:10AF] 68 -> Terratec AV350 (em2860) [0ccd:0084] 69 -> KWorld ATSC 315U HDTV TV Box (em2882) [eb1a:a313] 70 -> Evga inDtube (em2882) @@ -76,3 +76,7 @@ 76 -> KWorld PlusTV 340U or UB435-Q (ATSC) (em2870) [1b80:a340] 77 -> EM2874 Leadership ISDBT (em2874) 78 -> PCTV nanoStick T2 290e (em28174) + 79 -> Terratec Cinergy H5 (em2884) [0ccd:10a2,0ccd:10ad] + 80 -> PCTV DVB-S2 Stick (460e) (em28174) + 81 -> Hauppauge WinTV HVR 930C (em2884) [2040:1605] + 82 -> Terratec Cinergy HTC Stick (em2884) [0ccd:00b2] diff --git a/Documentation/video4linux/CARDLIST.saa7134 b/Documentation/video4linux/CARDLIST.saa7134 index 7efae9bd73e..e7ef38a1985 100644 --- a/Documentation/video4linux/CARDLIST.saa7134 +++ b/Documentation/video4linux/CARDLIST.saa7134 @@ -186,3 +186,4 @@ 185 -> MagicPro ProHDTV Pro2 DMB-TH/Hybrid [17de:d136] 186 -> Beholder BeholdTV 501 [5ace:5010] 187 -> Beholder BeholdTV 503 FM [5ace:5030] +188 -> Sensoray 811/911 [6000:0811,6000:0911] diff --git a/Documentation/video4linux/CARDLIST.saa7164 b/Documentation/video4linux/CARDLIST.saa7164 index 152bd7b781c..2205e8d5553 100644 --- a/Documentation/video4linux/CARDLIST.saa7164 +++ b/Documentation/video4linux/CARDLIST.saa7164 @@ -7,3 +7,5 @@ 6 -> Hauppauge WinTV-HVR2200 [0070:8901] 7 -> Hauppauge WinTV-HVR2250 [0070:8891,0070:8851] 8 -> Hauppauge WinTV-HVR2250 [0070:88A1] + 9 -> Hauppauge WinTV-HVR2200 [0070:8940] + 10 -> Hauppauge WinTV-HVR2200 [0070:8953] diff --git a/Documentation/video4linux/gspca.txt b/Documentation/video4linux/gspca.txt index b15e29f3112..f2060f0dc02 100644 --- a/Documentation/video4linux/gspca.txt +++ b/Documentation/video4linux/gspca.txt @@ -189,6 +189,7 @@ ov519 05a9:0511 Video Blaster WebCam 3/WebCam Plus, D-Link USB Digital Video Ca ov519 05a9:0518 Creative WebCam ov519 05a9:0519 OV519 Microphone ov519 05a9:0530 OmniVision +ov534_9 05a9:1550 OmniVision VEHO Filmscanner ov519 05a9:2800 OmniVision SuperCAM ov519 05a9:4519 Webcam Classic ov534_9 05a9:8065 OmniVision test kit ov538+ov9712 @@ -278,6 +279,7 @@ pac7302 093a:2628 Genius iLook 300 pac7302 093a:2629 Genious iSlim 300 pac7302 093a:262a Webcam 300k pac7302 093a:262c Philips SPC 230 NC +jl2005bcd 0979:0227 Various brands, 19 known cameras supported jeilinj 0979:0280 Sakar 57379 jeilinj 0979:0280 Sportscam DV15 zc3xx 0ac8:0302 Z-star Vimicro zc0302 diff --git a/Documentation/video4linux/v4l2-framework.txt b/Documentation/video4linux/v4l2-framework.txt index f8dcabf7852..659b2ba12a4 100644 --- a/Documentation/video4linux/v4l2-framework.txt +++ b/Documentation/video4linux/v4l2-framework.txt @@ -612,6 +612,12 @@ You can set a pointer to a mutex_lock in struct video_device. Usually this will be either a top-level mutex or a mutex per device node. If you want finer-grained locking then you have to set it to NULL and do you own locking. +It is up to the driver developer to decide which method to use. However, if +your driver has high-latency operations (for example, changing the exposure +of a USB webcam might take a long time), then you might be better off with +doing your own locking if you want to allow the user to do other things with +the device while waiting for the high-latency command to finish. + If a lock is specified then all file operations will be serialized on that lock. If you use videobuf then you must pass the same lock to the videobuf queue initialize function: if videobuf has to wait for a frame to arrive, then @@ -619,6 +625,11 @@ it will temporarily unlock the lock and relock it afterwards. If your driver also waits in the code, then you should do the same to allow other processes to access the device node while the first process is waiting for something. +In the case of videobuf2 you will need to implement the wait_prepare and +wait_finish callbacks to unlock/lock if applicable. In particular, if you use +the lock in struct video_device then you must unlock/lock this mutex in +wait_prepare and wait_finish. + The implementation of a hotplug disconnect should also take the lock before calling v4l2_device_disconnect. |
