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matroskadec: demux relevant subtitle packets after a seek 

only works for subtitle tracks which were properly indexed up to the seek point

Originally committed as revision 15284 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Aurelien Jacobs 2008-09-09 12:10:25 +00:00
parent 82360e670d
commit c16582579b
1 changed files with 17 additions and 3 deletions
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20
libavformat/matroskadec.c
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@ -1471,7 +1471,7 @@ static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
track->end_timecode = FFMAX(track->end_timecode, timecode+duration);
}
if (matroska->skip_to_keyframe) {
if (matroska->skip_to_keyframe && track->type != MATROSKA_TRACK_TYPE_SUBTITLE) {
if (!is_keyframe || timecode < matroska->skip_to_timecode)
return res;
matroska->skip_to_keyframe = 0;
@ -1689,8 +1689,9 @@ static int matroska_read_seek(AVFormatContext *s, int stream_index,
int64_t timestamp, int flags)
{
MatroskaDemuxContext *matroska = s->priv_data;
MatroskaTrack *tracks = matroska->tracks.elem;
AVStream *st = s->streams[stream_index];
int index;
int i, index, index_sub, index_min;
if (timestamp < 0)
timestamp = 0;
@ -1709,7 +1710,20 @@ static int matroska_read_seek(AVFormatContext *s, int stream_index,
if (index < 0)
return 0;
url_fseek(s->pb, st->index_entries[index].pos, SEEK_SET);
index_min = index;
for (i=0; i < matroska->tracks.nb_elem; i++) {
tracks[i].end_timecode = 0;
if (tracks[i].type == MATROSKA_TRACK_TYPE_SUBTITLE
&& !tracks[i].stream->discard != AVDISCARD_ALL) {
index_sub = av_index_search_timestamp(tracks[i].stream, st->index_entries[index].timestamp, AVSEEK_FLAG_BACKWARD);
if (index_sub >= 0
&& st->index_entries[index_sub].pos < st->index_entries[index_min].pos
&& st->index_entries[index].timestamp - st->index_entries[index_sub].timestamp < 30000000000/matroska->time_scale)
index_min = index_sub;
}
}
url_fseek(s->pb, st->index_entries[index_min].pos, SEEK_SET);
matroska->skip_to_keyframe = !(flags & AVSEEK_FLAG_ANY);
matroska->skip_to_timecode = st->index_entries[index].timestamp;
matroska->done = 0;