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* seek in raw DV patch by Nathan Kurz (nate at verse dot com)

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Originally committed as revision 3477 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Nathan Kurz 2004-09-18 00:32:36 +00:00 committed by Roman Shaposhnik
parent 66d1cdb672
commit 0bf4e2b8a3
1 changed files with 12 additions and 3 deletions
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15
libavformat/dv.c
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@ -821,10 +821,19 @@ int dv_produce_packet(DVDemuxContext *c, AVPacket *pkt,
int64_t dv_frame_offset(DVDemuxContext *c, int64_t timestamp)
{
const DVprofile* sys = dv_codec_profile(&c->vst->codec);
const DVprofile* sys;
// FIXME: sys may be wrong if last dv_read_packet() failed (buffer is junk)
sys = dv_codec_profile(&c->vst->codec);
return sys->frame_size * ((timestamp * sys->frame_rate) /
(AV_TIME_BASE * sys->frame_rate_base));
// timestamp was scaled by time_base/AV_BASE_RATE by av_seek_frame()
int64_t frame_number = av_rescale(sys->frame_rate, timestamp,
(int64_t) 30000 * sys->frame_rate_base);
// offset must be a multiple of frame_size else dv_read_packet() will fail
int64_t offset = (int64_t) sys->frame_size * frame_number;
return offset;
}
/************************************************************