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avformat/utils: correct for timestamp wrap earlier 

This uses dts & pts as reference instead of first_dts

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-12-04 02:00:23 +01:00
parent d7ead9ad44
commit 394b0c830a
1 changed files with 23 additions and 13 deletions
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36
libavformat/utils.c
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@ -55,6 +55,8 @@
* various utility functions for use within FFmpeg
*/
static int update_wrap_reference(AVFormatContext *s, AVStream *st, int stream_index, AVPacket *pkt);
unsigned avformat_version(void)
{
av_assert0(LIBAVFORMAT_VERSION_MICRO >= 100);
@ -709,6 +711,17 @@ int ff_read_packet(AVFormatContext *s, AVPacket *pkt)
}
st= s->streams[pkt->stream_index];
if (update_wrap_reference(s, st, pkt->stream_index, pkt) && st->pts_wrap_behavior == AV_PTS_WRAP_SUB_OFFSET) {
// correct first time stamps to negative values
if (!is_relative(st->first_dts))
st->first_dts = wrap_timestamp(st, st->first_dts);
if (!is_relative(st->start_time))
st->start_time = wrap_timestamp(st, st->start_time);
if (!is_relative(st->cur_dts))
st->cur_dts = wrap_timestamp(st, st->cur_dts);
}
pkt->dts = wrap_timestamp(st, pkt->dts);
pkt->pts = wrap_timestamp(st, pkt->pts);
@ -868,13 +881,20 @@ static AVPacketList *get_next_pkt(AVFormatContext *s, AVStream *st, AVPacketList
return NULL;
}
static int update_wrap_reference(AVFormatContext *s, AVStream *st, int stream_index)
static int update_wrap_reference(AVFormatContext *s, AVStream *st, int stream_index, AVPacket *pkt)
{
int64_t ref = pkt->dts;
if (ref == AV_NOPTS_VALUE)
ref = pkt->pts;
if (ref == AV_NOPTS_VALUE)
return 0;
ref &= (1LL<<st->pts_wrap_bits)-1;
if (s->correct_ts_overflow && st->pts_wrap_bits < 63 &&
st->pts_wrap_reference == AV_NOPTS_VALUE && st->first_dts != AV_NOPTS_VALUE) {
st->pts_wrap_reference == AV_NOPTS_VALUE) {
int i;
int64_t ref = st->first_dts & ((1LL<<st->pts_wrap_bits)-1);
// reference time stamp should be 60 s before first time stamp
int64_t pts_wrap_reference = ref - av_rescale(60, st->time_base.den, st->time_base.num);
// if first time stamp is not more than 1/8 and 60s before the wrap point, subtract rather than add wrap offset
@ -972,16 +992,6 @@ static void update_initial_timestamps(AVFormatContext *s, int stream_index,
}
}
if (update_wrap_reference(s, st, stream_index) && st->pts_wrap_behavior == AV_PTS_WRAP_SUB_OFFSET) {
// correct first time stamps to negative values
st->first_dts = wrap_timestamp(st, st->first_dts);
st->start_time = wrap_timestamp(st, st->start_time);
st->cur_dts = wrap_timestamp(st, st->cur_dts);
pkt->dts = wrap_timestamp(st, pkt->dts);
pkt->pts = wrap_timestamp(st, pkt->pts);
pts = wrap_timestamp(st, pts);
}
if (st->start_time == AV_NOPTS_VALUE)
st->start_time = pts;
}