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Enable forward seek in Musepack demuxer 

Originally committed as revision 7381 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Kostya Shishkov 2006-12-28 05:33:31 +00:00
parent d037d797a4
commit e311363245
1 changed files with 31 additions and 3 deletions
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34
libavformat/mpc.c
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@ -71,6 +71,7 @@ static int mpc_read_header(AVFormatContext *s, AVFormatParameters *ap)
c->curframe = 0;
c->lastframe = -1;
c->curbits = 8;
c->frames_noted = 0;
st = av_new_stream(s, 0);
if (!st)
@ -156,15 +157,42 @@ static int mpc_read_close(AVFormatContext *s)
return 0;
}
/**
* Seek to the given position
* If position is unknown but is within the limits of file
* then packets are skipped unless desired position is reached
*
* Also this function makes use of the fact that timestamp == frameno
*/
static int mpc_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
{
AVStream *st = s->streams[stream_index];
MPCContext *c = s->priv_data;
AVPacket pkt1, *pkt = &pkt1;
int ret;
int index = av_index_search_timestamp(st, timestamp, flags);
if (index < 0)
return -1;
c->curframe = st->index_entries[index].pos;
uint32_t lastframe;
/* if found, seek there */
if (index >= 0){
c->curframe = st->index_entries[index].pos;
return 0;
}
/* if timestamp is out of bounds, return error */
if(timestamp < 0 || timestamp >= c->fcount)
return -1;
/* seek to the furthest known position and read packets until
we reach desired position */
lastframe = c->curframe;
if(c->frames_noted) c->curframe = c->frames_noted - 1;
while(c->curframe < timestamp){
ret = av_read_frame(s, pkt);
if (ret < 0){
c->curframe = lastframe;
return -1;
}
av_free_packet(pkt);
}
return 0;
}