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ODML index parsing support 

Originally committed as revision 5081 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2006-03-01 01:32:32 +00:00
parent 9eb40bcf41
commit 94d1d6c02d
1 changed files with 68 additions and 3 deletions
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69
libavformat/avidec.c
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@ -37,7 +37,7 @@ typedef struct AVIStream {
int sample_size; /* audio only data */
int start;
int cum_len; /* temporary storage (used during seek) */
int64_t cum_len; /* temporary storage (used during seek) */
int prefix; ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
int prefix_count;
@ -85,6 +85,65 @@ static int get_riff(AVIContext *avi, ByteIOContext *pb)
return 0;
}
static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
ByteIOContext *pb = &s->pb;
int longs_pre_entry= get_le16(pb);
int index_sub_type = get_byte(pb);
int index_type = get_byte(pb);
int entries_in_use = get_le32(pb);
int chunk_id = get_le32(pb);
int64_t base = get_le64(pb);
int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
AVStream *st;
AVIStream *ast;
int i;
// av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%Ld\n",
// longs_pre_entry,index_type, entries_in_use, chunk_id, base);
if(stream_id > s->nb_streams || stream_id < 0)
return -1;
st= s->streams[stream_id];
ast = st->priv_data;
if(index_sub_type)
return -1;
get_le32(pb);
if(index_type && longs_pre_entry != 2)
return -1;
if(index_type>1)
return -1;
for(i=0; i<entries_in_use; i++){
if(index_type){
int64_t pos= get_le32(pb) + base;
int len = get_le32(pb);
av_add_index_entry(st, pos, ast->cum_len, 0, (len<0) ? 0 : AVINDEX_KEYFRAME);
len &= 0x7FFFFFFF;
if(ast->sample_size)
ast->cum_len += len / ast->sample_size;
else
ast->cum_len ++;
}else{
int64_t offset= get_le64(pb);
int size = get_le32(pb);
int duration = get_le32(pb);
int64_t pos= url_ftell(pb);
url_fseek(pb, offset+8, SEEK_SET);
read_braindead_odml_indx(s, frame_num);
frame_num += duration;
url_fseek(pb, pos, SEEK_SET);
}
}
return 0;
}
static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
AVIContext *avi = s->priv_data;
@ -326,6 +385,12 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
}
}
break;
case MKTAG('i', 'n', 'd', 'x'):
i= url_ftell(pb);
read_braindead_odml_indx(s, 0);
avi->index_loaded=1;
url_fseek(pb, i+size, SEEK_SET);
break;
default:
/* skip tag */
size += (size & 1);
@ -344,7 +409,7 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
return -1;
}
assert(!avi->index_loaded);
if(!avi->index_loaded)
avi_load_index(s);
avi->index_loaded = 1;