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Try to find out correct start time to make seeking faster and add some

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extra checks to make sure the seeking function will not hang forever.

Originally committed as revision 5814 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Reimar Döffinger 2006-07-23 18:19:33 +00:00
parent 8dfe90941a
commit 22ffac707e
3 changed files with 34 additions and 5 deletions
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1
libavformat/avformat.h
View File

@ -472,6 +472,7 @@ int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
int av_add_index_entry(AVStream *st,
int64_t pos, int64_t timestamp, int size, int distance, int flags);
int av_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts, int flags);
void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp);
/* media file output */
int av_set_parameters(AVFormatContext *s, AVFormatParameters *ap);

36
libavformat/ogg2.c
View File

@ -201,7 +201,6 @@ ogg_new_stream (AVFormatContext * s, uint32_t serial)
return AVERROR_NOMEM;
av_set_pts_info(st, 64, 1, 1000000);
st->start_time = 0;
return idx;
}
@ -495,6 +494,16 @@ ogg_get_length (AVFormatContext * s)
ogg->size = size;
ogg_restore (s, 0);
ogg_save (s);
while (ogg_read_page (s, &i)) {
if (i == idx && ogg->streams[i].granule != -1 && ogg->streams[i].granule != 0)
break;
}
if (i == idx) {
s->streams[idx]->start_time = ogg_gptopts (s, idx, ogg->streams[idx].granule);
s->streams[idx]->duration -= s->streams[idx]->start_time;
}
ogg_restore (s, 0);
return 0;
}
@ -572,12 +581,14 @@ ogg_read_seek (AVFormatContext * s, int stream_index, int64_t target_ts,
ogg_t *ogg = s->priv_data;
ByteIOContext *bc = &s->pb;
uint64_t min = 0, max = ogg->size;
uint64_t tmin = 0, tmax = st->duration;
uint64_t tmin = st->start_time, tmax = st->start_time + st->duration;
int64_t pts = AV_NOPTS_VALUE;
ogg_save (s);
while (min <= max){
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;
@ -599,9 +610,25 @@ ogg_read_seek (AVFormatContext * s, int stream_index, int64_t target_ts,
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;
}
@ -615,7 +642,8 @@ ogg_read_seek (AVFormatContext * s, int stream_index, int64_t target_ts,
pts = AV_NOPTS_VALUE;
}
return pts;
av_update_cur_dts(s, st, pts);
return 0;
#if 0
//later...

2
libavformat/utils.c
View File

@ -1097,7 +1097,7 @@ static void av_read_frame_flush(AVFormatContext *s)
* @param timestamp new dts expressed in time_base of param ref_st
* @param ref_st reference stream giving time_base of param timestamp
*/
static void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp){
void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp){
int i;
for(i = 0; i < s->nb_streams; i++) {