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avformat/matroskaenc: postpone writing the Tracks master

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This will allow us to write updated stream information not available
during write_header().

Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2016-10-30 16:39:03 -03:00
parent 748ce9d702
commit ee888cfbe7
1 changed files with 15 additions and 5 deletions
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20
libavformat/matroskaenc.c
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@ -121,6 +121,8 @@ typedef struct MatroskaMuxContext {
ebml_master tags;
AVIOContext *info_bc;
ebml_master info;
AVIOContext *tracks_bc;
ebml_master tracks_master;
ebml_master segment;
int64_t segment_offset;
ebml_master cluster;
@ -1283,15 +1285,14 @@ static int mkv_write_track(AVFormatContext *s, MatroskaMuxContext *mkv,
static int mkv_write_tracks(AVFormatContext *s)
{
MatroskaMuxContext *mkv = s->priv_data;
AVIOContext *dyn_cp, *pb = s->pb;
ebml_master tracks;
AVIOContext *pb = s->pb;
int i, ret, default_stream_exists = 0;
ret = mkv_add_seekhead_entry(mkv->main_seekhead, MATROSKA_ID_TRACKS, avio_tell(pb));
if (ret < 0)
return ret;
ret = start_ebml_master_crc32(pb, &dyn_cp, mkv, &tracks, MATROSKA_ID_TRACKS, 0);
ret = start_ebml_master_crc32(pb, &mkv->tracks_bc, mkv, &mkv->tracks_master, MATROSKA_ID_TRACKS, 0);
if (ret < 0)
return ret;
@ -1300,11 +1301,16 @@ static int mkv_write_tracks(AVFormatContext *s)
default_stream_exists |= st->disposition & AV_DISPOSITION_DEFAULT;
}
for (i = 0; i < s->nb_streams; i++) {
ret = mkv_write_track(s, mkv, i, dyn_cp, default_stream_exists);
ret = mkv_write_track(s, mkv, i, mkv->tracks_bc, default_stream_exists);
if (ret < 0)
return ret;
}
end_ebml_master_crc32(pb, &dyn_cp, mkv, tracks);
if (pb->seekable && !mkv->is_live)
put_ebml_void(pb, avio_tell(mkv->tracks_bc));
else
end_ebml_master_crc32(pb, &mkv->tracks_bc, mkv, mkv->tracks_master);
return 0;
}
@ -2336,6 +2342,10 @@ static int mkv_write_trailer(AVFormatContext *s)
avio_seek(pb, mkv->info.pos, SEEK_SET);
end_ebml_master_crc32(pb, &mkv->info_bc, mkv, mkv->info);
// write tracks master
avio_seek(pb, mkv->tracks_master.pos, SEEK_SET);
end_ebml_master_crc32(pb, &mkv->tracks_bc, mkv, mkv->tracks_master);
// update stream durations
if (!mkv->is_live && mkv->stream_durations) {
int i;