diff options
Diffstat (limited to 'drivers/media/dvb-core/dvb_demux.c')
| -rw-r--r-- | drivers/media/dvb-core/dvb_demux.c | 1330 |
1 files changed, 1330 insertions, 0 deletions
diff --git a/drivers/media/dvb-core/dvb_demux.c b/drivers/media/dvb-core/dvb_demux.c new file mode 100644 index 00000000000..6c7ff0cdcd3 --- /dev/null +++ b/drivers/media/dvb-core/dvb_demux.c @@ -0,0 +1,1330 @@ +/* + * dvb_demux.c - DVB kernel demux API + * + * Copyright (C) 2000-2001 Ralph Metzler <ralph@convergence.de> + * & Marcus Metzler <marcus@convergence.de> + * for convergence integrated media GmbH + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public License + * as published by the Free Software Foundation; either version 2.1 + * 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 Lesser 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/sched.h> +#include <linux/spinlock.h> +#include <linux/slab.h> +#include <linux/vmalloc.h> +#include <linux/module.h> +#include <linux/poll.h> +#include <linux/string.h> +#include <linux/crc32.h> +#include <asm/uaccess.h> +#include <asm/div64.h> + +#include "dvb_demux.h" + +#define NOBUFS +/* +** #define DVB_DEMUX_SECTION_LOSS_LOG to monitor payload loss in the syslog +*/ +// #define DVB_DEMUX_SECTION_LOSS_LOG + +static int dvb_demux_tscheck; +module_param(dvb_demux_tscheck, int, 0644); +MODULE_PARM_DESC(dvb_demux_tscheck, + "enable transport stream continuity and TEI check"); + +static int dvb_demux_speedcheck; +module_param(dvb_demux_speedcheck, int, 0644); +MODULE_PARM_DESC(dvb_demux_speedcheck, + "enable transport stream speed check"); + +static int dvb_demux_feed_err_pkts = 1; +module_param(dvb_demux_feed_err_pkts, int, 0644); +MODULE_PARM_DESC(dvb_demux_feed_err_pkts, + "when set to 0, drop packets with the TEI bit set (1 by default)"); + +#define dprintk_tscheck(x...) do { \ + if (dvb_demux_tscheck && printk_ratelimit()) \ + printk(x); \ + } while (0) + +/****************************************************************************** + * static inlined helper functions + ******************************************************************************/ + +static inline u16 section_length(const u8 *buf) +{ + return 3 + ((buf[1] & 0x0f) << 8) + buf[2]; +} + +static inline u16 ts_pid(const u8 *buf) +{ + return ((buf[1] & 0x1f) << 8) + buf[2]; +} + +static inline u8 payload(const u8 *tsp) +{ + if (!(tsp[3] & 0x10)) // no payload? + return 0; + + if (tsp[3] & 0x20) { // adaptation field? + if (tsp[4] > 183) // corrupted data? + return 0; + else + return 184 - 1 - tsp[4]; + } + + return 184; +} + +static u32 dvb_dmx_crc32(struct dvb_demux_feed *f, const u8 *src, size_t len) +{ + return (f->feed.sec.crc_val = crc32_be(f->feed.sec.crc_val, src, len)); +} + +static void dvb_dmx_memcopy(struct dvb_demux_feed *f, u8 *d, const u8 *s, + size_t len) +{ + memcpy(d, s, len); +} + +/****************************************************************************** + * Software filter functions + ******************************************************************************/ + +static inline int dvb_dmx_swfilter_payload(struct dvb_demux_feed *feed, + const u8 *buf) +{ + int count = payload(buf); + int p; + //int ccok; + //u8 cc; + + if (count == 0) + return -1; + + p = 188 - count; + + /* + cc = buf[3] & 0x0f; + ccok = ((feed->cc + 1) & 0x0f) == cc; + feed->cc = cc; + if (!ccok) + printk("missed packet!\n"); + */ + + if (buf[1] & 0x40) // PUSI ? + feed->peslen = 0xfffa; + + feed->peslen += count; + + return feed->cb.ts(&buf[p], count, NULL, 0, &feed->feed.ts, DMX_OK); +} + +static int dvb_dmx_swfilter_sectionfilter(struct dvb_demux_feed *feed, + struct dvb_demux_filter *f) +{ + u8 neq = 0; + int i; + + for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) { + u8 xor = f->filter.filter_value[i] ^ feed->feed.sec.secbuf[i]; + + if (f->maskandmode[i] & xor) + return 0; + + neq |= f->maskandnotmode[i] & xor; + } + + if (f->doneq && !neq) + return 0; + + return feed->cb.sec(feed->feed.sec.secbuf, feed->feed.sec.seclen, + NULL, 0, &f->filter, DMX_OK); +} + +static inline int dvb_dmx_swfilter_section_feed(struct dvb_demux_feed *feed) +{ + struct dvb_demux *demux = feed->demux; + struct dvb_demux_filter *f = feed->filter; + struct dmx_section_feed *sec = &feed->feed.sec; + int section_syntax_indicator; + + if (!sec->is_filtering) + return 0; + + if (!f) + return 0; + + if (sec->check_crc) { + section_syntax_indicator = ((sec->secbuf[1] & 0x80) != 0); + if (section_syntax_indicator && + demux->check_crc32(feed, sec->secbuf, sec->seclen)) + return -1; + } + + do { + if (dvb_dmx_swfilter_sectionfilter(feed, f) < 0) + return -1; + } while ((f = f->next) && sec->is_filtering); + + sec->seclen = 0; + + return 0; +} + +static void dvb_dmx_swfilter_section_new(struct dvb_demux_feed *feed) +{ + struct dmx_section_feed *sec = &feed->feed.sec; + +#ifdef DVB_DEMUX_SECTION_LOSS_LOG + if (sec->secbufp < sec->tsfeedp) { + int i, n = sec->tsfeedp - sec->secbufp; + + /* + * Section padding is done with 0xff bytes entirely. + * Due to speed reasons, we won't check all of them + * but just first and last. + */ + if (sec->secbuf[0] != 0xff || sec->secbuf[n - 1] != 0xff) { + printk("dvb_demux.c section ts padding loss: %d/%d\n", + n, sec->tsfeedp); + printk("dvb_demux.c pad data:"); + for (i = 0; i < n; i++) + printk(" %02x", sec->secbuf[i]); + printk("\n"); + } + } +#endif + + sec->tsfeedp = sec->secbufp = sec->seclen = 0; + sec->secbuf = sec->secbuf_base; +} + +/* + * Losless Section Demux 1.4.1 by Emard + * Valsecchi Patrick: + * - middle of section A (no PUSI) + * - end of section A and start of section B + * (with PUSI pointing to the start of the second section) + * + * In this case, without feed->pusi_seen you'll receive a garbage section + * consisting of the end of section A. Basically because tsfeedp + * is incemented and the use=0 condition is not raised + * when the second packet arrives. + * + * Fix: + * when demux is started, let feed->pusi_seen = 0 to + * prevent initial feeding of garbage from the end of + * previous section. When you for the first time see PUSI=1 + * then set feed->pusi_seen = 1 + */ +static int dvb_dmx_swfilter_section_copy_dump(struct dvb_demux_feed *feed, + const u8 *buf, u8 len) +{ + struct dvb_demux *demux = feed->demux; + struct dmx_section_feed *sec = &feed->feed.sec; + u16 limit, seclen, n; + + if (sec->tsfeedp >= DMX_MAX_SECFEED_SIZE) + return 0; + + if (sec->tsfeedp + len > DMX_MAX_SECFEED_SIZE) { +#ifdef DVB_DEMUX_SECTION_LOSS_LOG + printk("dvb_demux.c section buffer full loss: %d/%d\n", + sec->tsfeedp + len - DMX_MAX_SECFEED_SIZE, + DMX_MAX_SECFEED_SIZE); +#endif + len = DMX_MAX_SECFEED_SIZE - sec->tsfeedp; + } + + if (len <= 0) + return 0; + + demux->memcopy(feed, sec->secbuf_base + sec->tsfeedp, buf, len); + sec->tsfeedp += len; + + /* + * Dump all the sections we can find in the data (Emard) + */ + limit = sec->tsfeedp; + if (limit > DMX_MAX_SECFEED_SIZE) + return -1; /* internal error should never happen */ + + /* to be sure always set secbuf */ + sec->secbuf = sec->secbuf_base + sec->secbufp; + + for (n = 0; sec->secbufp + 2 < limit; n++) { + seclen = section_length(sec->secbuf); + if (seclen <= 0 || seclen > DMX_MAX_SECTION_SIZE + || seclen + sec->secbufp > limit) + return 0; + sec->seclen = seclen; + sec->crc_val = ~0; + /* dump [secbuf .. secbuf+seclen) */ + if (feed->pusi_seen) + dvb_dmx_swfilter_section_feed(feed); +#ifdef DVB_DEMUX_SECTION_LOSS_LOG + else + printk("dvb_demux.c pusi not seen, discarding section data\n"); +#endif + sec->secbufp += seclen; /* secbufp and secbuf moving together is */ + sec->secbuf += seclen; /* redundant but saves pointer arithmetic */ + } + + return 0; +} + +static int dvb_dmx_swfilter_section_packet(struct dvb_demux_feed *feed, + const u8 *buf) +{ + u8 p, count; + int ccok, dc_i = 0; + u8 cc; + + count = payload(buf); + + if (count == 0) /* count == 0 if no payload or out of range */ + return -1; + + p = 188 - count; /* payload start */ + + cc = buf[3] & 0x0f; + ccok = ((feed->cc + 1) & 0x0f) == cc; + feed->cc = cc; + + if (buf[3] & 0x20) { + /* adaption field present, check for discontinuity_indicator */ + if ((buf[4] > 0) && (buf[5] & 0x80)) + dc_i = 1; + } + + if (!ccok || dc_i) { +#ifdef DVB_DEMUX_SECTION_LOSS_LOG + printk("dvb_demux.c discontinuity detected %d bytes lost\n", + count); + /* + * those bytes under sume circumstances will again be reported + * in the following dvb_dmx_swfilter_section_new + */ +#endif + /* + * Discontinuity detected. Reset pusi_seen = 0 to + * stop feeding of suspicious data until next PUSI=1 arrives + */ + feed->pusi_seen = 0; + dvb_dmx_swfilter_section_new(feed); + } + + if (buf[1] & 0x40) { + /* PUSI=1 (is set), section boundary is here */ + if (count > 1 && buf[p] < count) { + const u8 *before = &buf[p + 1]; + u8 before_len = buf[p]; + const u8 *after = &before[before_len]; + u8 after_len = count - 1 - before_len; + + dvb_dmx_swfilter_section_copy_dump(feed, before, + before_len); + /* before start of new section, set pusi_seen = 1 */ + feed->pusi_seen = 1; + dvb_dmx_swfilter_section_new(feed); + dvb_dmx_swfilter_section_copy_dump(feed, after, + after_len); + } +#ifdef DVB_DEMUX_SECTION_LOSS_LOG + else if (count > 0) + printk("dvb_demux.c PUSI=1 but %d bytes lost\n", count); +#endif + } else { + /* PUSI=0 (is not set), no section boundary */ + dvb_dmx_swfilter_section_copy_dump(feed, &buf[p], count); + } + + return 0; +} + +static inline void dvb_dmx_swfilter_packet_type(struct dvb_demux_feed *feed, + const u8 *buf) +{ + switch (feed->type) { + case DMX_TYPE_TS: + if (!feed->feed.ts.is_filtering) + break; + if (feed->ts_type & TS_PACKET) { + if (feed->ts_type & TS_PAYLOAD_ONLY) + dvb_dmx_swfilter_payload(feed, buf); + else + feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts, + DMX_OK); + } + if (feed->ts_type & TS_DECODER) + if (feed->demux->write_to_decoder) + feed->demux->write_to_decoder(feed, buf, 188); + break; + + case DMX_TYPE_SEC: + if (!feed->feed.sec.is_filtering) + break; + if (dvb_dmx_swfilter_section_packet(feed, buf) < 0) + feed->feed.sec.seclen = feed->feed.sec.secbufp = 0; + break; + + default: + break; + } +} + +#define DVR_FEED(f) \ + (((f)->type == DMX_TYPE_TS) && \ + ((f)->feed.ts.is_filtering) && \ + (((f)->ts_type & (TS_PACKET | TS_DEMUX)) == TS_PACKET)) + +static void dvb_dmx_swfilter_packet(struct dvb_demux *demux, const u8 *buf) +{ + struct dvb_demux_feed *feed; + u16 pid = ts_pid(buf); + int dvr_done = 0; + + if (dvb_demux_speedcheck) { + struct timespec cur_time, delta_time; + u64 speed_bytes, speed_timedelta; + + demux->speed_pkts_cnt++; + + /* show speed every SPEED_PKTS_INTERVAL packets */ + if (!(demux->speed_pkts_cnt % SPEED_PKTS_INTERVAL)) { + cur_time = current_kernel_time(); + + if (demux->speed_last_time.tv_sec != 0 && + demux->speed_last_time.tv_nsec != 0) { + delta_time = timespec_sub(cur_time, + demux->speed_last_time); + speed_bytes = (u64)demux->speed_pkts_cnt + * 188 * 8; + /* convert to 1024 basis */ + speed_bytes = 1000 * div64_u64(speed_bytes, + 1024); + speed_timedelta = + (u64)timespec_to_ns(&delta_time); + speed_timedelta = div64_u64(speed_timedelta, + 1000000); /* nsec -> usec */ + printk(KERN_INFO "TS speed %llu Kbits/sec \n", + div64_u64(speed_bytes, + speed_timedelta)); + } + + demux->speed_last_time = cur_time; + demux->speed_pkts_cnt = 0; + } + } + + if (buf[1] & 0x80) { + dprintk_tscheck("TEI detected. " + "PID=0x%x data1=0x%x\n", + pid, buf[1]); + /* data in this packet can't be trusted - drop it unless + * module option dvb_demux_feed_err_pkts is set */ + if (!dvb_demux_feed_err_pkts) + return; + } else /* if TEI bit is set, pid may be wrong- skip pkt counter */ + if (demux->cnt_storage && dvb_demux_tscheck) { + /* check pkt counter */ + if (pid < MAX_PID) { + if (buf[3] & 0x10) + demux->cnt_storage[pid] = + (demux->cnt_storage[pid] + 1) & 0xf; + + if ((buf[3] & 0xf) != demux->cnt_storage[pid]) { + dprintk_tscheck("TS packet counter mismatch. PID=0x%x expected 0x%x got 0x%x\n", + pid, demux->cnt_storage[pid], + buf[3] & 0xf); + demux->cnt_storage[pid] = buf[3] & 0xf; + } + } + /* end check */ + } + + list_for_each_entry(feed, &demux->feed_list, list_head) { + if ((feed->pid != pid) && (feed->pid != 0x2000)) + continue; + + /* copy each packet only once to the dvr device, even + * if a PID is in multiple filters (e.g. video + PCR) */ + if ((DVR_FEED(feed)) && (dvr_done++)) + continue; + + if (feed->pid == pid) + dvb_dmx_swfilter_packet_type(feed, buf); + else if (feed->pid == 0x2000) + feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts, DMX_OK); + } +} + +void dvb_dmx_swfilter_packets(struct dvb_demux *demux, const u8 *buf, + size_t count) +{ + unsigned long flags; + + spin_lock_irqsave(&demux->lock, flags); + + while (count--) { + if (buf[0] == 0x47) + dvb_dmx_swfilter_packet(demux, buf); + buf += 188; + } + + spin_unlock_irqrestore(&demux->lock, flags); +} + +EXPORT_SYMBOL(dvb_dmx_swfilter_packets); + +static inline int find_next_packet(const u8 *buf, int pos, size_t count, + const int pktsize) +{ + int start = pos, lost; + + while (pos < count) { + if (buf[pos] == 0x47 || + (pktsize == 204 && buf[pos] == 0xB8)) + break; + pos++; + } + + lost = pos - start; + if (lost) { + /* This garbage is part of a valid packet? */ + int backtrack = pos - pktsize; + if (backtrack >= 0 && (buf[backtrack] == 0x47 || + (pktsize == 204 && buf[backtrack] == 0xB8))) + return backtrack; + } + + return pos; +} + +/* Filter all pktsize= 188 or 204 sized packets and skip garbage. */ +static inline void _dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf, + size_t count, const int pktsize) +{ + int p = 0, i, j; + const u8 *q; + unsigned long flags; + + spin_lock_irqsave(&demux->lock, flags); + + if (demux->tsbufp) { /* tsbuf[0] is now 0x47. */ + i = demux->tsbufp; + j = pktsize - i; + if (count < j) { + memcpy(&demux->tsbuf[i], buf, count); + demux->tsbufp += count; + goto bailout; + } + memcpy(&demux->tsbuf[i], buf, j); + if (demux->tsbuf[0] == 0x47) /* double check */ + dvb_dmx_swfilter_packet(demux, demux->tsbuf); + demux->tsbufp = 0; + p += j; + } + + while (1) { + p = find_next_packet(buf, p, count, pktsize); + if (p >= count) + break; + if (count - p < pktsize) + break; + + q = &buf[p]; + + if (pktsize == 204 && (*q == 0xB8)) { + memcpy(demux->tsbuf, q, 188); + demux->tsbuf[0] = 0x47; + q = demux->tsbuf; + } + dvb_dmx_swfilter_packet(demux, q); + p += pktsize; + } + + i = count - p; + if (i) { + memcpy(demux->tsbuf, &buf[p], i); + demux->tsbufp = i; + if (pktsize == 204 && demux->tsbuf[0] == 0xB8) + demux->tsbuf[0] = 0x47; + } + +bailout: + spin_unlock_irqrestore(&demux->lock, flags); +} + +void dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf, size_t count) +{ + _dvb_dmx_swfilter(demux, buf, count, 188); +} +EXPORT_SYMBOL(dvb_dmx_swfilter); + +void dvb_dmx_swfilter_204(struct dvb_demux *demux, const u8 *buf, size_t count) +{ + _dvb_dmx_swfilter(demux, buf, count, 204); +} +EXPORT_SYMBOL(dvb_dmx_swfilter_204); + +void dvb_dmx_swfilter_raw(struct dvb_demux *demux, const u8 *buf, size_t count) +{ + unsigned long flags; + + spin_lock_irqsave(&demux->lock, flags); + + demux->feed->cb.ts(buf, count, NULL, 0, &demux->feed->feed.ts, DMX_OK); + + spin_unlock_irqrestore(&demux->lock, flags); +} +EXPORT_SYMBOL(dvb_dmx_swfilter_raw); + +static struct dvb_demux_filter *dvb_dmx_filter_alloc(struct dvb_demux *demux) +{ + int i; + + for (i = 0; i < demux->filternum; i++) + if (demux->filter[i].state == DMX_STATE_FREE) + break; + + if (i == demux->filternum) + return NULL; + + demux->filter[i].state = DMX_STATE_ALLOCATED; + + return &demux->filter[i]; +} + +static struct dvb_demux_feed *dvb_dmx_feed_alloc(struct dvb_demux *demux) +{ + int i; + + for (i = 0; i < demux->feednum; i++) + if (demux->feed[i].state == DMX_STATE_FREE) + break; + + if (i == demux->feednum) + return NULL; + + demux->feed[i].state = DMX_STATE_ALLOCATED; + + return &demux->feed[i]; +} + +static int dvb_demux_feed_find(struct dvb_demux_feed *feed) +{ + struct dvb_demux_feed *entry; + + list_for_each_entry(entry, &feed->demux->feed_list, list_head) + if (entry == feed) + return 1; + + return 0; +} + +static void dvb_demux_feed_add(struct dvb_demux_feed *feed) +{ + spin_lock_irq(&feed->demux->lock); + if (dvb_demux_feed_find(feed)) { + printk(KERN_ERR "%s: feed already in list (type=%x state=%x pid=%x)\n", + __func__, feed->type, feed->state, feed->pid); + goto out; + } + + list_add(&feed->list_head, &feed->demux->feed_list); +out: + spin_unlock_irq(&feed->demux->lock); +} + +static void dvb_demux_feed_del(struct dvb_demux_feed *feed) +{ + spin_lock_irq(&feed->demux->lock); + if (!(dvb_demux_feed_find(feed))) { + printk(KERN_ERR "%s: feed not in list (type=%x state=%x pid=%x)\n", + __func__, feed->type, feed->state, feed->pid); + goto out; + } + + list_del(&feed->list_head); +out: + spin_unlock_irq(&feed->demux->lock); +} + +static int dmx_ts_feed_set(struct dmx_ts_feed *ts_feed, u16 pid, int ts_type, + enum dmx_ts_pes pes_type, + size_t circular_buffer_size, struct timespec timeout) +{ + struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed; + struct dvb_demux *demux = feed->demux; + + if (pid > DMX_MAX_PID) + return -EINVAL; + + if (mutex_lock_interruptible(&demux->mutex)) + return -ERESTARTSYS; + + if (ts_type & TS_DECODER) { + if (pes_type >= DMX_PES_OTHER) { + mutex_unlock(&demux->mutex); + return -EINVAL; + } + + if (demux->pesfilter[pes_type] && + demux->pesfilter[pes_type] != feed) { + mutex_unlock(&demux->mutex); + return -EINVAL; + } + + demux->pesfilter[pes_type] = feed; + demux->pids[pes_type] = pid; + } + + dvb_demux_feed_add(feed); + + feed->pid = pid; + feed->buffer_size = circular_buffer_size; + feed->timeout = timeout; + feed->ts_type = ts_type; + feed->pes_type = pes_type; + + if (feed->buffer_size) { +#ifdef NOBUFS + feed->buffer = NULL; +#else + feed->buffer = vmalloc(feed->buffer_size); + if (!feed->buffer) { + mutex_unlock(&demux->mutex); + return -ENOMEM; + } +#endif + } + + feed->state = DMX_STATE_READY; + mutex_unlock(&demux->mutex); + + return 0; +} + +static int dmx_ts_feed_start_filtering(struct dmx_ts_feed *ts_feed) +{ + struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed; + struct dvb_demux *demux = feed->demux; + int ret; + + if (mutex_lock_interruptible(&demux->mutex)) + return -ERESTARTSYS; + + if (feed->state != DMX_STATE_READY || feed->type != DMX_TYPE_TS) { + mutex_unlock(&demux->mutex); + return -EINVAL; + } + + if (!demux->start_feed) { + mutex_unlock(&demux->mutex); + return -ENODEV; + } + + if ((ret = demux->start_feed(feed)) < 0) { + mutex_unlock(&demux->mutex); + return ret; + } + + spin_lock_irq(&demux->lock); + ts_feed->is_filtering = 1; + feed->state = DMX_STATE_GO; + spin_unlock_irq(&demux->lock); + mutex_unlock(&demux->mutex); + + return 0; +} + +static int dmx_ts_feed_stop_filtering(struct dmx_ts_feed *ts_feed) +{ + struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed; + struct dvb_demux *demux = feed->demux; + int ret; + + mutex_lock(&demux->mutex); + + if (feed->state < DMX_STATE_GO) { + mutex_unlock(&demux->mutex); + return -EINVAL; + } + + if (!demux->stop_feed) { + mutex_unlock(&demux->mutex); + return -ENODEV; + } + + ret = demux->stop_feed(feed); + + spin_lock_irq(&demux->lock); + ts_feed->is_filtering = 0; + feed->state = DMX_STATE_ALLOCATED; + spin_unlock_irq(&demux->lock); + mutex_unlock(&demux->mutex); + + return ret; +} + +static int dvbdmx_allocate_ts_feed(struct dmx_demux *dmx, + struct dmx_ts_feed **ts_feed, + dmx_ts_cb callback) +{ + struct dvb_demux *demux = (struct dvb_demux *)dmx; + struct dvb_demux_feed *feed; + + if (mutex_lock_interruptible(&demux->mutex)) + return -ERESTARTSYS; + + if (!(feed = dvb_dmx_feed_alloc(demux))) { + mutex_unlock(&demux->mutex); + return -EBUSY; + } + + feed->type = DMX_TYPE_TS; + feed->cb.ts = callback; + feed->demux = demux; + feed->pid = 0xffff; + feed->peslen = 0xfffa; + feed->buffer = NULL; + + (*ts_feed) = &feed->feed.ts; + (*ts_feed)->parent = dmx; + (*ts_feed)->priv = NULL; + (*ts_feed)->is_filtering = 0; + (*ts_feed)->start_filtering = dmx_ts_feed_start_filtering; + (*ts_feed)->stop_filtering = dmx_ts_feed_stop_filtering; + (*ts_feed)->set = dmx_ts_feed_set; + + if (!(feed->filter = dvb_dmx_filter_alloc(demux))) { + feed->state = DMX_STATE_FREE; + mutex_unlock(&demux->mutex); + return -EBUSY; + } + + feed->filter->type = DMX_TYPE_TS; + feed->filter->feed = feed; + feed->filter->state = DMX_STATE_READY; + + mutex_unlock(&demux->mutex); + + return 0; +} + +static int dvbdmx_release_ts_feed(struct dmx_demux *dmx, + struct dmx_ts_feed *ts_feed) +{ + struct dvb_demux *demux = (struct dvb_demux *)dmx; + struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed; + + mutex_lock(&demux->mutex); + + if (feed->state == DMX_STATE_FREE) { + mutex_unlock(&demux->mutex); + return -EINVAL; + } +#ifndef NOBUFS + vfree(feed->buffer); + feed->buffer = NULL; +#endif + + feed->state = DMX_STATE_FREE; + feed->filter->state = DMX_STATE_FREE; + + dvb_demux_feed_del(feed); + + feed->pid = 0xffff; + + if (feed->ts_type & TS_DECODER && feed->pes_type < DMX_PES_OTHER) + demux->pesfilter[feed->pes_type] = NULL; + + mutex_unlock(&demux->mutex); + return 0; +} + +/****************************************************************************** + * dmx_section_feed API calls + ******************************************************************************/ + +static int dmx_section_feed_allocate_filter(struct dmx_section_feed *feed, + struct dmx_section_filter **filter) +{ + struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed; + struct dvb_demux *dvbdemux = dvbdmxfeed->demux; + struct dvb_demux_filter *dvbdmxfilter; + + if (mutex_lock_interruptible(&dvbdemux->mutex)) + return -ERESTARTSYS; + + dvbdmxfilter = dvb_dmx_filter_alloc(dvbdemux); + if (!dvbdmxfilter) { + mutex_unlock(&dvbdemux->mutex); + return -EBUSY; + } + + spin_lock_irq(&dvbdemux->lock); + *filter = &dvbdmxfilter->filter; + (*filter)->parent = feed; + (*filter)->priv = NULL; + dvbdmxfilter->feed = dvbdmxfeed; + dvbdmxfilter->type = DMX_TYPE_SEC; + dvbdmxfilter->state = DMX_STATE_READY; + dvbdmxfilter->next = dvbdmxfeed->filter; + dvbdmxfeed->filter = dvbdmxfilter; + spin_unlock_irq(&dvbdemux->lock); + + mutex_unlock(&dvbdemux->mutex); + return 0; +} + +static int dmx_section_feed_set(struct dmx_section_feed *feed, + u16 pid, size_t circular_buffer_size, + int check_crc) +{ + struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed; + struct dvb_demux *dvbdmx = dvbdmxfeed->demux; + + if (pid > 0x1fff) + return -EINVAL; + + if (mutex_lock_interruptible(&dvbdmx->mutex)) + return -ERESTARTSYS; + + dvb_demux_feed_add(dvbdmxfeed); + + dvbdmxfeed->pid = pid; + dvbdmxfeed->buffer_size = circular_buffer_size; + dvbdmxfeed->feed.sec.check_crc = check_crc; + +#ifdef NOBUFS + dvbdmxfeed->buffer = NULL; +#else + dvbdmxfeed->buffer = vmalloc(dvbdmxfeed->buffer_size); + if (!dvbdmxfeed->buffer) { + mutex_unlock(&dvbdmx->mutex); + return -ENOMEM; + } +#endif + + dvbdmxfeed->state = DMX_STATE_READY; + mutex_unlock(&dvbdmx->mutex); + return 0; +} + +static void prepare_secfilters(struct dvb_demux_feed *dvbdmxfeed) +{ + int i; + struct dvb_demux_filter *f; + struct dmx_section_filter *sf; + u8 mask, mode, doneq; + + if (!(f = dvbdmxfeed->filter)) + return; + do { + sf = &f->filter; + doneq = 0; + for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) { + mode = sf->filter_mode[i]; + mask = sf->filter_mask[i]; + f->maskandmode[i] = mask & mode; + doneq |= f->maskandnotmode[i] = mask & ~mode; + } + f->doneq = doneq ? 1 : 0; + } while ((f = f->next)); +} + +static int dmx_section_feed_start_filtering(struct dmx_section_feed *feed) +{ + struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed; + struct dvb_demux *dvbdmx = dvbdmxfeed->demux; + int ret; + + if (mutex_lock_interruptible(&dvbdmx->mutex)) + return -ERESTARTSYS; + + if (feed->is_filtering) { + mutex_unlock(&dvbdmx->mutex); + return -EBUSY; + } + + if (!dvbdmxfeed->filter) { + mutex_unlock(&dvbdmx->mutex); + return -EINVAL; + } + + dvbdmxfeed->feed.sec.tsfeedp = 0; + dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base; + dvbdmxfeed->feed.sec.secbufp = 0; + dvbdmxfeed->feed.sec.seclen = 0; + + if (!dvbdmx->start_feed) { + mutex_unlock(&dvbdmx->mutex); + return -ENODEV; + } + + prepare_secfilters(dvbdmxfeed); + + if ((ret = dvbdmx->start_feed(dvbdmxfeed)) < 0) { + mutex_unlock(&dvbdmx->mutex); + return ret; + } + + spin_lock_irq(&dvbdmx->lock); + feed->is_filtering = 1; + dvbdmxfeed->state = DMX_STATE_GO; + spin_unlock_irq(&dvbdmx->lock); + + mutex_unlock(&dvbdmx->mutex); + return 0; +} + +static int dmx_section_feed_stop_filtering(struct dmx_section_feed *feed) +{ + struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed; + struct dvb_demux *dvbdmx = dvbdmxfeed->demux; + int ret; + + mutex_lock(&dvbdmx->mutex); + + if (!dvbdmx->stop_feed) { + mutex_unlock(&dvbdmx->mutex); + return -ENODEV; + } + + ret = dvbdmx->stop_feed(dvbdmxfeed); + + spin_lock_irq(&dvbdmx->lock); + dvbdmxfeed->state = DMX_STATE_READY; + feed->is_filtering = 0; + spin_unlock_irq(&dvbdmx->lock); + + mutex_unlock(&dvbdmx->mutex); + return ret; +} + +static int dmx_section_feed_release_filter(struct dmx_section_feed *feed, + struct dmx_section_filter *filter) +{ + struct dvb_demux_filter *dvbdmxfilter = (struct dvb_demux_filter *)filter, *f; + struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed; + struct dvb_demux *dvbdmx = dvbdmxfeed->demux; + + mutex_lock(&dvbdmx->mutex); + + if (dvbdmxfilter->feed != dvbdmxfeed) { + mutex_unlock(&dvbdmx->mutex); + return -EINVAL; + } + + if (feed->is_filtering) { + /* release dvbdmx->mutex as far as it is + acquired by stop_filtering() itself */ + mutex_unlock(&dvbdmx->mutex); + feed->stop_filtering(feed); + mutex_lock(&dvbdmx->mutex); + } + + spin_lock_irq(&dvbdmx->lock); + f = dvbdmxfeed->filter; + + if (f == dvbdmxfilter) { + dvbdmxfeed->filter = dvbdmxfilter->next; + } else { + while (f->next != dvbdmxfilter) + f = f->next; + f->next = f->next->next; + } + + dvbdmxfilter->state = DMX_STATE_FREE; + spin_unlock_irq(&dvbdmx->lock); + mutex_unlock(&dvbdmx->mutex); + return 0; +} + +static int dvbdmx_allocate_section_feed(struct dmx_demux *demux, + struct dmx_section_feed **feed, + dmx_section_cb callback) +{ + struct dvb_demux *dvbdmx = (struct dvb_demux *)demux; + struct dvb_demux_feed *dvbdmxfeed; + + if (mutex_lock_interruptible(&dvbdmx->mutex)) + return -ERESTARTSYS; + + if (!(dvbdmxfeed = dvb_dmx_feed_alloc(dvbdmx))) { + mutex_unlock(&dvbdmx->mutex); + return -EBUSY; + } + + dvbdmxfeed->type = DMX_TYPE_SEC; + dvbdmxfeed->cb.sec = callback; + dvbdmxfeed->demux = dvbdmx; + dvbdmxfeed->pid = 0xffff; + dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base; + dvbdmxfeed->feed.sec.secbufp = dvbdmxfeed->feed.sec.seclen = 0; + dvbdmxfeed->feed.sec.tsfeedp = 0; + dvbdmxfeed->filter = NULL; + dvbdmxfeed->buffer = NULL; + + (*feed) = &dvbdmxfeed->feed.sec; + (*feed)->is_filtering = 0; + (*feed)->parent = demux; + (*feed)->priv = NULL; + + (*feed)->set = dmx_section_feed_set; + (*feed)->allocate_filter = dmx_section_feed_allocate_filter; + (*feed)->start_filtering = dmx_section_feed_start_filtering; + (*feed)->stop_filtering = dmx_section_feed_stop_filtering; + (*feed)->release_filter = dmx_section_feed_release_filter; + + mutex_unlock(&dvbdmx->mutex); + return 0; +} + +static int dvbdmx_release_section_feed(struct dmx_demux *demux, + struct dmx_section_feed *feed) +{ + struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed; + struct dvb_demux *dvbdmx = (struct dvb_demux *)demux; + + mutex_lock(&dvbdmx->mutex); + + if (dvbdmxfeed->state == DMX_STATE_FREE) { + mutex_unlock(&dvbdmx->mutex); + return -EINVAL; + } +#ifndef NOBUFS + vfree(dvbdmxfeed->buffer); + dvbdmxfeed->buffer = NULL; +#endif + dvbdmxfeed->state = DMX_STATE_FREE; + + dvb_demux_feed_del(dvbdmxfeed); + + dvbdmxfeed->pid = 0xffff; + + mutex_unlock(&dvbdmx->mutex); + return 0; +} + +/****************************************************************************** + * dvb_demux kernel data API calls + ******************************************************************************/ + +static int dvbdmx_open(struct dmx_demux *demux) +{ + struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; + + if (dvbdemux->users >= MAX_DVB_DEMUX_USERS) + return -EUSERS; + + dvbdemux->users++; + return 0; +} + +static int dvbdmx_close(struct dmx_demux *demux) +{ + struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; + + if (dvbdemux->users == 0) + return -ENODEV; + + dvbdemux->users--; + //FIXME: release any unneeded resources if users==0 + return 0; +} + +static int dvbdmx_write(struct dmx_demux *demux, const char __user *buf, size_t count) +{ + struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; + void *p; + + if ((!demux->frontend) || (demux->frontend->source != DMX_MEMORY_FE)) + return -EINVAL; + + p = memdup_user(buf, count); + if (IS_ERR(p)) + return PTR_ERR(p); + if (mutex_lock_interruptible(&dvbdemux->mutex)) { + kfree(p); + return -ERESTARTSYS; + } + dvb_dmx_swfilter(dvbdemux, p, count); + kfree(p); + mutex_unlock(&dvbdemux->mutex); + + if (signal_pending(current)) + return -EINTR; + return count; +} + +static int dvbdmx_add_frontend(struct dmx_demux *demux, + struct dmx_frontend *frontend) +{ + struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; + struct list_head *head = &dvbdemux->frontend_list; + + list_add(&(frontend->connectivity_list), head); + + return 0; +} + +static int dvbdmx_remove_frontend(struct dmx_demux *demux, + struct dmx_frontend *frontend) +{ + struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; + struct list_head *pos, *n, *head = &dvbdemux->frontend_list; + + list_for_each_safe(pos, n, head) { + if (DMX_FE_ENTRY(pos) == frontend) { + list_del(pos); + return 0; + } + } + + return -ENODEV; +} + +static struct list_head *dvbdmx_get_frontends(struct dmx_demux *demux) +{ + struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; + + if (list_empty(&dvbdemux->frontend_list)) + return NULL; + + return &dvbdemux->frontend_list; +} + +static int dvbdmx_connect_frontend(struct dmx_demux *demux, + struct dmx_frontend *frontend) +{ + struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; + + if (demux->frontend) + return -EINVAL; + + mutex_lock(&dvbdemux->mutex); + + demux->frontend = frontend; + mutex_unlock(&dvbdemux->mutex); + return 0; +} + +static int dvbdmx_disconnect_frontend(struct dmx_demux *demux) +{ + struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; + + mutex_lock(&dvbdemux->mutex); + + demux->frontend = NULL; + mutex_unlock(&dvbdemux->mutex); + return 0; +} + +static int dvbdmx_get_pes_pids(struct dmx_demux *demux, u16 * pids) +{ + struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; + + memcpy(pids, dvbdemux->pids, 5 * sizeof(u16)); + return 0; +} + +int dvb_dmx_init(struct dvb_demux *dvbdemux) +{ + int i; + struct dmx_demux *dmx = &dvbdemux->dmx; + + dvbdemux->cnt_storage = NULL; + dvbdemux->users = 0; + dvbdemux->filter = vmalloc(dvbdemux->filternum * sizeof(struct dvb_demux_filter)); + + if (!dvbdemux->filter) + return -ENOMEM; + + dvbdemux->feed = vmalloc(dvbdemux->feednum * sizeof(struct dvb_demux_feed)); + if (!dvbdemux->feed) { + vfree(dvbdemux->filter); + dvbdemux->filter = NULL; + return -ENOMEM; + } + for (i = 0; i < dvbdemux->filternum; i++) { + dvbdemux->filter[i].state = DMX_STATE_FREE; + dvbdemux->filter[i].index = i; + } + for (i = 0; i < dvbdemux->feednum; i++) { + dvbdemux->feed[i].state = DMX_STATE_FREE; + dvbdemux->feed[i].index = i; + } + + dvbdemux->cnt_storage = vmalloc(MAX_PID + 1); + if (!dvbdemux->cnt_storage) + printk(KERN_WARNING "Couldn't allocate memory for TS/TEI check. Disabling it\n"); + + INIT_LIST_HEAD(&dvbdemux->frontend_list); + + for (i = 0; i < DMX_PES_OTHER; i++) { + dvbdemux->pesfilter[i] = NULL; + dvbdemux->pids[i] = 0xffff; + } + + INIT_LIST_HEAD(&dvbdemux->feed_list); + + dvbdemux->playing = 0; + dvbdemux->recording = 0; + dvbdemux->tsbufp = 0; + + if (!dvbdemux->check_crc32) + dvbdemux->check_crc32 = dvb_dmx_crc32; + + if (!dvbdemux->memcopy) + dvbdemux->memcopy = dvb_dmx_memcopy; + + dmx->frontend = NULL; + dmx->priv = dvbdemux; + dmx->open = dvbdmx_open; + dmx->close = dvbdmx_close; + dmx->write = dvbdmx_write; + dmx->allocate_ts_feed = dvbdmx_allocate_ts_feed; + dmx->release_ts_feed = dvbdmx_release_ts_feed; + dmx->allocate_section_feed = dvbdmx_allocate_section_feed; + dmx->release_section_feed = dvbdmx_release_section_feed; + + dmx->add_frontend = dvbdmx_add_frontend; + dmx->remove_frontend = dvbdmx_remove_frontend; + dmx->get_frontends = dvbdmx_get_frontends; + dmx->connect_frontend = dvbdmx_connect_frontend; + dmx->disconnect_frontend = dvbdmx_disconnect_frontend; + dmx->get_pes_pids = dvbdmx_get_pes_pids; + + mutex_init(&dvbdemux->mutex); + spin_lock_init(&dvbdemux->lock); + + return 0; +} + +EXPORT_SYMBOL(dvb_dmx_init); + +void dvb_dmx_release(struct dvb_demux *dvbdemux) +{ + vfree(dvbdemux->cnt_storage); + vfree(dvbdemux->filter); + vfree(dvbdemux->feed); +} + +EXPORT_SYMBOL(dvb_dmx_release); |