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matroskadec: prevent seeking before the first keyframe of the reference stream 

Originally committed as revision 15301 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Aurelien Jacobs 2008-09-11 22:42:17 +00:00
parent fd5c57b813
commit 5358a81f9c
1 changed files with 14 additions and 3 deletions
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17
libavformat/matroskadec.c
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@ -139,6 +139,7 @@ typedef struct {
EbmlList encodings;
AVStream *stream;
int64_t first_timecode;
int64_t end_timecode;
} MatroskaTrack;
@ -1181,6 +1182,7 @@ static int matroska_read_header(AVFormatContext *s, AVFormatParameters *ap)
st = track->stream = av_new_stream(s, 0);
if (st == NULL)
return AVERROR(ENOMEM);
track->first_timecode = AV_NOPTS_VALUE;
if (!strcmp(track->codec_id, "V_MS/VFW/FOURCC")
&& track->codec_priv.size >= 40
@ -1466,8 +1468,11 @@ static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
if (track->type == MATROSKA_TRACK_TYPE_SUBTITLE
&& timecode < track->end_timecode)
is_keyframe = 0; /* overlapping subtitles are not key frame */
if (is_keyframe)
if (is_keyframe) {
av_add_index_entry(st, cluster_pos, timecode, 0,0,AVINDEX_KEYFRAME);
if (track->first_timecode == AV_NOPTS_VALUE)
track->first_timecode = timecode;
}
track->end_timecode = FFMAX(track->end_timecode, timecode+duration);
}
@ -1692,9 +1697,15 @@ static int matroska_read_seek(AVFormatContext *s, int stream_index,
MatroskaTrack *tracks = matroska->tracks.elem;
AVStream *st = s->streams[stream_index];
int i, index, index_sub, index_min;
int64_t first_timecode = 0;
if (timestamp < 0)
timestamp = 0;
for (i=0; i < matroska->tracks.nb_elem; i++)
if (tracks[i].stream->index == stream_index &&
tracks[i].first_timecode != AV_NOPTS_VALUE)
first_timecode = tracks[i].first_timecode;
if (timestamp < first_timecode)
timestamp = first_timecode;
if ((index = av_index_search_timestamp(st, timestamp, flags)) < 0) {
if (st->nb_index_entries)