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mpegts: fix Continuity Counter error detection 

According to MPEG-TS specs, the continuity_counter shall not be
incremented when the adaptation_field_control of the packet
equals '00' or '10'.

Signed-off-by: Jindrich Makovicka <jindrich.makovicka@nangu.tv>
Signed-off-by: Anton Khirnov <anton@khirnov.net>
This commit is contained in:
Jindrich Makovicka 2011-06-30 09:03:15 +00:00 committed by Anton Khirnov
parent ca9036155d
commit 8923cfa328
1 changed files with 3 additions and 2 deletions
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5
libavformat/mpegts.c
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@ -1248,7 +1248,7 @@ static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
{
AVFormatContext *s = ts->stream;
MpegTSFilter *tss;
int len, pid, cc, cc_ok, afc, is_start;
int len, pid, cc, expected_cc, cc_ok, afc, is_start;
const uint8_t *p, *p_end;
int64_t pos;
@ -1266,7 +1266,8 @@ static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
/* continuity check (currently not used) */
cc = (packet[3] & 0xf);
cc_ok = (tss->last_cc < 0) || ((((tss->last_cc + 1) & 0x0f) == cc));
expected_cc = (packet[3] & 0x10) ? (tss->last_cc + 1) & 0x0f : tss->last_cc;
cc_ok = (tss->last_cc < 0) || (expected_cc == cc);
tss->last_cc = cc;
/* skip adaptation field */