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avformat/mpegts: factor duplicate seek back code into mpegts_resync 

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2016-04-10 19:23:40 +02:00
parent 38433345e5
commit ea41ab0987
1 changed files with 6 additions and 6 deletions
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12
libavformat/mpegts.c
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@ -2354,11 +2354,14 @@ static void reanalyze(MpegTSContext *ts) {
/* XXX: try to find a better synchro over several packets (use
* get_packet_size() ?) */
static int mpegts_resync(AVFormatContext *s)
static int mpegts_resync(AVFormatContext *s, int seekback)
{
MpegTSContext *ts = s->priv_data;
AVIOContext *pb = s->pb;
int c, i;
uint64_t pos = avio_tell(pb);
avio_seek(pb, -FFMIN(seekback, pos), SEEK_CUR);
for (i = 0; i < ts->resync_size; i++) {
c = avio_r8(pb);
@ -2390,10 +2393,8 @@ static int read_packet(AVFormatContext *s, uint8_t *buf, int raw_packet_size,
/* check packet sync byte */
if ((*data)[0] != 0x47) {
/* find a new packet start */
uint64_t pos = avio_tell(pb);
avio_seek(pb, -FFMIN(raw_packet_size, pos), SEEK_CUR);
if (mpegts_resync(s) < 0)
if (mpegts_resync(s, raw_packet_size) < 0)
return AVERROR(EAGAIN);
else
continue;
@ -2748,8 +2749,7 @@ static av_unused int64_t mpegts_get_pcr(AVFormatContext *s, int stream_index,
if (avio_read(s->pb, buf, TS_PACKET_SIZE) != TS_PACKET_SIZE)
return AV_NOPTS_VALUE;
if (buf[0] != 0x47) {
avio_seek(s->pb, -TS_PACKET_SIZE, SEEK_CUR);
if (mpegts_resync(s) < 0)
if (mpegts_resync(s, TS_PACKET_SIZE) < 0)
return AV_NOPTS_VALUE;
pos = avio_tell(s->pb);
continue;