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avidec: infer absolute vs relative index from first packet

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This commit is contained in:
Alex Converse 2011-06-01 17:33:38 -07:00
parent 23ce6e7212
commit d3f610c186
1 changed files with 23 additions and 7 deletions
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30
libavformat/avidec.c
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@ -836,7 +836,7 @@ static int get_stream_idx(int *d){
}
}
static int avi_sync(AVFormatContext *s)
static int avi_sync(AVFormatContext *s, int exit_early)
{
AVIContext *avi = s->priv_data;
AVIOContext *pb = s->pb;
@ -916,7 +916,9 @@ start_sync:
if( (st->discard >= AVDISCARD_DEFAULT && size==0)
/*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering
|| st->discard >= AVDISCARD_ALL){
ast->frame_offset += get_duration(ast, size);
if (!exit_early) {
ast->frame_offset += get_duration(ast, size);
}
avio_skip(pb, size);
goto start_sync;
}
@ -936,6 +938,8 @@ start_sync:
(d[2] == 'd' && d[3] == 'c') ||
(d[2] == 'w' && d[3] == 'b')*/) {
if (exit_early)
return 0;
//av_log(s, AV_LOG_DEBUG, "OK\n");
if(d[2]*256+d[3] == ast->prefix)
ast->prefix_count++;
@ -1117,7 +1121,7 @@ resync:
return size;
}
if ((err = avi_sync(s)) < 0)
if ((err = avi_sync(s, 0)) < 0)
return err;
goto resync;
}
@ -1131,13 +1135,22 @@ static int avi_read_idx1(AVFormatContext *s, int size)
int nb_index_entries, i;
AVStream *st;
AVIStream *ast;
unsigned int index, tag, flags, pos, len;
unsigned int index, tag, flags, pos, len, first_packet = 1;
unsigned last_pos= -1;
int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
nb_index_entries = size / 16;
if (nb_index_entries <= 0)
return -1;
idx1_pos = avio_tell(pb);
avio_seek(pb, avi->movi_list+4, SEEK_SET);
if (avi_sync(s, 1) == 0) {
first_packet_pos = avio_tell(pb) - 8;
}
avi->stream_index = -1;
avio_seek(pb, idx1_pos, SEEK_SET);
/* Read the entries and sort them in each stream component. */
for(i = 0; i < nb_index_entries; i++) {
tag = avio_rl32(pb);
@ -1146,9 +1159,6 @@ static int avi_read_idx1(AVFormatContext *s, int size)
len = avio_rl32(pb);
av_dlog(s, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
i, tag, flags, pos, len);
if(i==0 && pos > avi->movi_list)
avi->movi_list= 0; //FIXME better check
pos += avi->movi_list;
index = ((tag & 0xff) - '0') * 10;
index += ((tag >> 8) & 0xff) - '0';
@ -1157,6 +1167,12 @@ static int avi_read_idx1(AVFormatContext *s, int size)
st = s->streams[index];
ast = st->priv_data;
if(first_packet && first_packet_pos && len) {
data_offset = first_packet_pos - pos;
first_packet = 0;
}
pos += data_offset;
av_dlog(s, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
if(pb->eof_reached)