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movenc: Write tfdt atoms 

These allow getting the absolute start timestamp of a fragment
without reading preceding timestamps. This fixes sync between
tracks if starting from fragments in different streams that don't
align exactly.

This also is a prerequisite for producing DASH content.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2014-10-06 23:20:50 +03:00
parent eabdc2a830
commit c2c22c75cf
1 changed files with 13 additions and 0 deletions
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13
libavformat/movenc.c
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@ -2550,6 +2550,18 @@ static int mov_write_tfrf_tags(AVIOContext *pb, MOVMuxContext *mov,
return 0;
}
static int mov_write_tfdt_tag(AVIOContext *pb, MOVTrack *track)
{
int64_t pos = avio_tell(pb);
avio_wb32(pb, 0); /* size */
ffio_wfourcc(pb, "tfdt");
avio_w8(pb, 1); /* version */
avio_wb24(pb, 0);
avio_wb64(pb, track->frag_start);
return update_size(pb, pos);
}
static int mov_write_traf_tag(AVIOContext *pb, MOVMuxContext *mov,
MOVTrack *track, int64_t moof_offset,
int moof_size)
@ -2559,6 +2571,7 @@ static int mov_write_traf_tag(AVIOContext *pb, MOVMuxContext *mov,
ffio_wfourcc(pb, "traf");
mov_write_tfhd_tag(pb, mov, track, moof_offset);
mov_write_tfdt_tag(pb, track);
mov_write_trun_tag(pb, mov, track, moof_size);
if (mov->mode == MODE_ISM) {
mov_write_tfxd_tag(pb, track);