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Remove ogg seek function, instead use generic seek via read_timestamp function 

Originally committed as revision 10702 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Reimar Döffinger 2007-10-10 10:33:20 +00:00
parent a1f29b959b
commit ce3132be88
1 changed files with 1 additions and 84 deletions
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85
libavformat/ogg2.c
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@ -576,89 +576,6 @@ ogg_read_close (AVFormatContext * s)
}
static int
ogg_read_seek (AVFormatContext * s, int stream_index, int64_t target_ts,
int flags)
{
AVStream *st = s->streams[stream_index];
ogg_t *ogg = s->priv_data;
ByteIOContext *bc = &s->pb;
uint64_t min = 0, max = ogg->size;
uint64_t tmin = st->start_time, tmax = st->start_time + st->duration;
int64_t pts = AV_NOPTS_VALUE;
ogg_save (s);
if ((uint64_t)target_ts < tmin || target_ts < 0)
target_ts = tmin;
while (min <= max && tmin < tmax){
uint64_t p = min + (max - min) * (target_ts - tmin) / (tmax - tmin);
int i = -1;
url_fseek (bc, p, SEEK_SET);
while (!ogg_read_page (s, &i)){
if (i == stream_index && ogg->streams[i].granule != 0 &&
ogg->streams[i].granule != -1)
break;
}
if (i == -1)
break;
pts = ogg_gptopts (s, i, ogg->streams[i].granule);
p = url_ftell (bc);
if (FFABS (pts - target_ts) * st->time_base.num < st->time_base.den)
break;
if (pts > target_ts){
if (max == p && tmax == pts) {
// probably our tmin is wrong, causing us to always end up too late in the file
tmin = (target_ts + tmin + 1) / 2;
if (tmin == target_ts) {
url_fseek(bc, min, SEEK_SET);
break;
}
}
max = p;
tmax = pts;
}else{
if (min == p && tmin == pts) {
// probably our tmax is wrong, causing us to always end up too early in the file
tmax = (target_ts + tmax) / 2;
if (tmax == target_ts) {
url_fseek(bc, max, SEEK_SET);
break;
}
}
min = p;
tmin = pts;
}
}
if (FFABS (pts - target_ts) * st->time_base.num < st->time_base.den){
ogg_restore (s, 1);
ogg_reset (ogg);
}else{
ogg_restore (s, 0);
pts = AV_NOPTS_VALUE;
}
av_update_cur_dts(s, st, pts);
return 0;
#if 0
//later...
int64_t pos;
if (av_seek_frame_binary (s, stream_index, target_ts, flags) < 0)
return -1;
pos = url_ftell (&s->pb);
ogg_read_timestamp (s, stream_index, &pos, pos - 1);
#endif
}
static int64_t
ogg_read_timestamp (AVFormatContext * s, int stream_index, int64_t * pos_arg,
int64_t pos_limit)
@ -700,7 +617,7 @@ AVInputFormat ogg_demuxer = {
ogg_read_header,
ogg_read_packet,
ogg_read_close,
ogg_read_seek,
NULL,
ogg_read_timestamp,
.extensions = "ogg",
};