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dynamic index building so forward and backward seeking in avi without an index is possible

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Originally committed as revision 7842 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2007-02-05 23:06:08 +00:00
parent e9b78eeba2
commit ded3c7da61
1 changed files with 8 additions and 6 deletions
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14
libavformat/avidec.c
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@ -626,9 +626,9 @@ resync:
pkt->stream_index = avi->stream_index; pkt->stream_index = avi->stream_index;
if (st->codec->codec_type == CODEC_TYPE_VIDEO) { if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
if(st->index_entries){
AVIndexEntry *e; AVIndexEntry *e;
int index; int index;
assert(st->index_entries);
index= av_index_search_timestamp(st, pkt->dts, 0); index= av_index_search_timestamp(st, pkt->dts, 0);
e= &st->index_entries[index]; e= &st->index_entries[index];
@ -637,11 +637,6 @@ resync:
if (e->flags & AVINDEX_KEYFRAME) if (e->flags & AVINDEX_KEYFRAME)
pkt->flags |= PKT_FLAG_KEY; pkt->flags |= PKT_FLAG_KEY;
} }
} else {
/* if no index, better to say that all frames
are key frames */
pkt->flags |= PKT_FLAG_KEY;
}
} else { } else {
pkt->flags |= PKT_FLAG_KEY; pkt->flags |= PKT_FLAG_KEY;
} }
@ -735,6 +730,13 @@ resync:
avi->stream_index= n; avi->stream_index= n;
ast->packet_size= size + 8; ast->packet_size= size + 8;
ast->remaining= size; ast->remaining= size;
{
uint64_t pos= url_ftell(pb) - 8;
if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
av_add_index_entry(st, pos, ast->frame_offset / FFMAX(1, ast->sample_size), size, 0, AVINDEX_KEYFRAME);
}
}
goto resync; goto resync;
} }
} }