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Code Issues Releases Activity

mpegts: reanalyze packet size on mismatches

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Fixes Ticket1812
Fixes Ticket2838

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-08-18 16:35:38 +02:00
parent 7d776062f9
commit c666c59ac1
1 changed files with 38 additions and 0 deletions
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38
libavformat/mpegts.c
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@ -99,6 +99,10 @@ struct MpegTSContext {
/** raw packet size, including FEC if present */
int raw_packet_size;
int size_stat[3];
int size_stat_count;
#define SIZE_STAT_THRESHOLD 10
int64_t pos47_full;
/** if true, all pids are analyzed to find streams */
@ -1901,6 +1905,39 @@ static int handle_packet(MpegTSContext *ts, const uint8_t *packet)
return 0;
}
static void reanalyze(MpegTSContext *ts) {
AVIOContext *pb = ts->stream->pb;
int64_t pos = avio_tell(pb);
if(pos < 0)
return;
pos += ts->raw_packet_size - ts->pos47_full;
if (pos == TS_PACKET_SIZE) {
ts->size_stat[0] ++;
} else if (pos == TS_DVHS_PACKET_SIZE) {
ts->size_stat[1] ++;
} else if (pos == TS_FEC_PACKET_SIZE) {
ts->size_stat[2] ++;
}
ts->size_stat_count ++;
if(ts->size_stat_count > SIZE_STAT_THRESHOLD) {
int newsize = 0;
if (ts->size_stat[0] > SIZE_STAT_THRESHOLD) {
newsize = TS_PACKET_SIZE;
} else if (ts->size_stat[1] > SIZE_STAT_THRESHOLD) {
newsize = TS_DVHS_PACKET_SIZE;
} else if (ts->size_stat[2] > SIZE_STAT_THRESHOLD) {
newsize = TS_FEC_PACKET_SIZE;
}
if (newsize) {
av_log(ts->stream, AV_LOG_WARNING, "changing packet size to %d\n", newsize);
ts->raw_packet_size = newsize;
}
ts->size_stat_count = 0;
memset(ts->size_stat, 0, sizeof(ts->size_stat));
}
}
/* XXX: try to find a better synchro over several packets (use
get_packet_size() ?) */
static int mpegts_resync(AVFormatContext *s)
@ -1914,6 +1951,7 @@ static int mpegts_resync(AVFormatContext *s)
return -1;
if (c == 0x47) {
avio_seek(pb, -1, SEEK_CUR);
reanalyze(s->priv_data);
return 0;
}
}