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WSL2-Linux-Kernel
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WSL2-Linux-Kernel/drivers/media/dvb-core/dvb_demux.c

1329 строки
32 KiB
C
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/*
* 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.
*
*/
#define pr_fmt(fmt) "dvb_demux: " fmt
#include <linux/sched/signal.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 <linux/uaccess.h>
#include <asm/div64.h>
#include <media/dvb_demux.h>
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(fmt, arg...) \
printk(KERN_DEBUG pr_fmt("%s: " fmt), __func__, ##arg)
#define dprintk_tscheck(x...) do { \
if (dvb_demux_tscheck && printk_ratelimit()) \
dprintk(x); \
} while (0)
#ifdef CONFIG_DVB_DEMUX_SECTION_LOSS_LOG
# define dprintk_sect_loss(x...) dprintk(x)
#else
# define dprintk_sect_loss(x...)
#endif
#define set_buf_flags(__feed, __flag) \
do { \
(__feed)->buffer_flags |= (__flag); \
} 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) {
set_buf_flags(feed, DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED);
dprintk_sect_loss("missed packet: %d instead of %d!\n",
cc, (feed->cc + 1) & 0x0f);
}
if (buf[1] & 0x40) // PUSI ?
feed->peslen = 0xfffa;
feed->peslen += count;
return feed->cb.ts(&buf[p], count, NULL, 0, &feed->feed.ts,
&feed->buffer_flags);
}
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, &feed->buffer_flags);
}
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)) {
set_buf_flags(feed, DMX_BUFFER_FLAG_HAD_CRC32_DISCARD);
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;
if (sec->secbufp < sec->tsfeedp) {
int 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) {
set_buf_flags(feed,
DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED);
dprintk_sect_loss("section ts padding loss: %d/%d\n",
n, sec->tsfeedp);
dprintk_sect_loss("pad data: %*ph\n", n, sec->secbuf);
}
}
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 = false 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 = true
*/
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) {
set_buf_flags(feed, DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED);
dprintk_sect_loss("section buffer full loss: %d/%d\n",
sec->tsfeedp + len - DMX_MAX_SECFEED_SIZE,
DMX_MAX_SECFEED_SIZE);
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);
} else {
set_buf_flags(feed,
DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED);
dprintk_sect_loss("pusi not seen, discarding section data\n");
}
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) {
if (dc_i) {
set_buf_flags(feed,
DMX_BUFFER_FLAG_DISCONTINUITY_INDICATOR);
dprintk_sect_loss("%d frame with disconnect indicator\n",
cc);
} else {
set_buf_flags(feed,
DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED);
dprintk_sect_loss("discontinuity: %d instead of %d. %d bytes lost\n",
cc, (feed->cc + 1) & 0x0f, count + 4);
}
/*
* those bytes under some circumstances will again be reported
* in the following dvb_dmx_swfilter_section_new
*/
/*
* Discontinuity detected. Reset pusi_seen to
* stop feeding of suspicious data until next PUSI=1 arrives
*
* FIXME: does it make sense if the MPEG-TS is the one
* reporting discontinuity?
*/
feed->pusi_seen = false;
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 */
feed->pusi_seen = true;
dvb_dmx_swfilter_section_new(feed);
dvb_dmx_swfilter_section_copy_dump(feed, after,
after_len);
} else if (count > 0) {
set_buf_flags(feed,
DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED);
dprintk_sect_loss("PUSI=1 but %d bytes lost\n", count);
}
} 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,
&feed->buffer_flags);
}
/* Used only on full-featured devices */
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) {
ktime_t cur_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 = ktime_get();
if (ktime_to_ns(demux->speed_last_time) != 0) {
speed_bytes = (u64)demux->speed_pkts_cnt
* 188 * 8;
/* convert to 1024 basis */
speed_bytes = 1000 * div64_u64(speed_bytes,
1024);
speed_timedelta = ktime_ms_delta(cur_time,
demux->speed_last_time);
if (speed_timedelta)
dprintk("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) {
list_for_each_entry(feed, &demux->feed_list, list_head) {
if ((feed->pid != pid) && (feed->pid != 0x2000))
continue;
set_buf_flags(feed, DMX_BUFFER_FLAG_TEI);
}
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]) {
list_for_each_entry(feed, &demux->feed_list, list_head) {
if ((feed->pid != pid) && (feed->pid != 0x2000))
continue;
set_buf_flags(feed,
DMX_BUFFER_PKT_COUNTER_MISMATCH);
}
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,
&feed->buffer_flags);
}
}
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,
&demux->feed->buffer_flags);
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)) {
pr_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))) {
pr_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, ktime_t 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->timeout = timeout;
feed->ts_type = ts_type;
feed->pes_type = pes_type;
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_flags = 0;
(*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;
}
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, 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->feed.sec.check_crc = check_crc;
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 = false;
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 ? true : false;
} 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;
dvbdmxfeed->pusi_seen = false;
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->buffer_flags = 0;
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;
(*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;
}
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(array_size(sizeof(struct dvb_demux_filter),
dvbdemux->filternum));
if (!dvbdemux->filter)
return -ENOMEM;
dvbdemux->feed = vmalloc(array_size(sizeof(struct dvb_demux_feed),
dvbdemux->feednum));
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)
pr_warn("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);
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