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[media] dvb_demux: Transport stream continuity check fix

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This patch avoids incrementing continuity counter
demux->cnt_storage[pid] for TS packets without payload in accordance
with ISO /IEC 13818-1.

[mchehab@redhat.com: unmangle whitespacing and fix CodingStyle.
 Also checked ISO/IEC spec: patch is according with it]
Reviewed-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: John Smith <johns90812@gmail.com>

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
John Smith 2013-03-05 18:02:43 -03:00 committed by Mauro Carvalho Chehab
parent fa7b9ac2e2
commit 5144f5b760
1 changed files with 13 additions and 11 deletions
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24
drivers/media/dvb-core/dvb_demux.c
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@ -440,20 +440,22 @@ static void dvb_dmx_swfilter_packet(struct dvb_demux *demux, const u8 *buf)
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] & 0xf) != demux->cnt_storage[pid])
dprintk_tscheck("TS packet counter mismatch. "
"PID=0x%x expected 0x%x "
"got 0x%x\n",
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) + 1)&0xf;
demux->cnt_storage[pid] = buf[3] & 0xf;
}
}
/* end check */
}
/* end check */
}
list_for_each_entry(feed, &demux->feed_list, list_head) {
if ((feed->pid != pid) && (feed->pid != 0x2000))