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keyframe & non keyframe index fixes

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Originally committed as revision 4034 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer
2005-03-13 00:13:01 +00:00
parent fcc872422e
commit 27a5fe5fdf
3 changed files with 20 additions and 10 deletions
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25
libavformat/utils.c
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@@ -1024,7 +1024,7 @@ int av_add_index_entry(AVStream *st,
st->index_entries= entries;
index= av_index_search_timestamp(st, timestamp, 0);
index= av_index_search_timestamp(st, timestamp, AVSEEK_FLAG_ANY);
if(index<0){
index= st->nb_index_entries++;
@@ -1090,13 +1090,14 @@ static int is_raw_stream(AVFormatContext *s)
/**
* gets the index for a specific timestamp.
* @param backward if non zero then the returned index will correspond to
* @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond to
* the timestamp which is <= the requested one, if backward is 0
* then it will be >=
* if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
* @return < 0 if no such timestamp could be found
*/
int av_index_search_timestamp(AVStream *st, int64_t wanted_timestamp,
int backward)
int flags)
{
AVIndexEntry *entries= st->index_entries;
int nb_entries= st->nb_index_entries;
@@ -1114,7 +1115,13 @@ int av_index_search_timestamp(AVStream *st, int64_t wanted_timestamp,
if(timestamp <= wanted_timestamp)
a = m;
}
m= backward ? a : b;
m= (flags & AVSEEK_FLAG_BACKWARD) ? a : b;
if(!(flags & AVSEEK_FLAG_ANY)){
while(m>=0 && m<nb_entries && !(entries[m].flags & AVINDEX_KEYFRAME)){
m += (flags & AVSEEK_FLAG_BACKWARD) ? -1 : 1;
}
}
if(m == nb_entries)
return -1;
@@ -1152,7 +1159,7 @@ int av_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts
if(st->index_entries){
AVIndexEntry *e;
index= av_index_search_timestamp(st, target_ts, 1);
index= av_index_search_timestamp(st, target_ts, flags | AVSEEK_FLAG_BACKWARD); //FIXME whole func must be checked for non keyframe entries in index case, especially read_timestamp()
index= FFMAX(index, 0);
e= &st->index_entries[index];
@@ -1166,8 +1173,10 @@ int av_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts
}else{
assert(index==0);
}
index++;
if(index < st->nb_index_entries){
index= av_index_search_timestamp(st, target_ts, flags & ~AVSEEK_FLAG_BACKWARD);
assert(index < st->nb_index_entries);
if(index >= 0){
e= &st->index_entries[index];
assert(e->timestamp >= target_ts);
pos_max= e->pos;
@@ -1316,7 +1325,7 @@ static int av_seek_frame_generic(AVFormatContext *s,
}
st = s->streams[stream_index];
index = av_index_search_timestamp(st, timestamp, flags & AVSEEK_FLAG_BACKWARD);
index = av_index_search_timestamp(st, timestamp, flags);
if (index < 0)
return -1;