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#define MIN(a,b) (((a)<(b))?(a):(b))
void read_avi_header(int no_index){
int stream_id=-1;
//---- AVI header:
avi_header.idx_size=0;
while(1){
int id=stream_read_dword_le(demuxer->stream);
int chunksize,size2;
static int last_fccType=0;
//
if(stream_eof(demuxer->stream)) break;
//
if(id==mmioFOURCC('L','I','S','T')){
int len=stream_read_dword_le(demuxer->stream)-4; // list size
id=stream_read_dword_le(demuxer->stream); // list type
if(verbose>=2) printf("LIST %.4s len=%d\n",&id,len);
if(id==listtypeAVIMOVIE){
// found MOVI header
avi_header.movi_start=stream_tell(demuxer->stream);
avi_header.movi_end=avi_header.movi_start+len;
if(verbose>=1) printf("Found movie at 0x%X - 0x%X\n",avi_header.movi_start,avi_header.movi_end);
len=(len+1)&(~1);
stream_skip(demuxer->stream,len);
}
continue;
}
size2=stream_read_dword_le(demuxer->stream);
if(verbose>=2) printf("CHUNK %.4s len=%d\n",&id,size2);
chunksize=(size2+1)&(~1);
switch(id){
case ckidAVIMAINHDR: // read 'avih'
stream_read(demuxer->stream,(char*) &avi_header.avih,MIN(size2,sizeof(avi_header.avih)));
chunksize-=MIN(size2,sizeof(avi_header.avih));
if(verbose) print_avih(&avi_header.avih);
break;
case ckidSTREAMHEADER: { // read 'strh'
AVIStreamHeader h;
stream_read(demuxer->stream,(char*) &h,MIN(size2,sizeof(h)));
chunksize-=MIN(size2,sizeof(h));
if(h.fccType==streamtypeVIDEO) memcpy(&avi_header.video,&h,sizeof(h));else
if(h.fccType==streamtypeAUDIO) memcpy(&avi_header.audio,&h,sizeof(h));
last_fccType=h.fccType;
if(verbose>=1) print_strh(&h);
++stream_id;
break; }
case ckidSTREAMFORMAT: { // read 'strf'
if(last_fccType==streamtypeVIDEO){
stream_read(demuxer->stream,(char*) &avi_header.bih,MIN(size2,sizeof(avi_header.bih)));
chunksize-=MIN(size2,sizeof(avi_header.bih));
// init_video_codec();
// init_video_out();
if(demuxer->video->id==-1) demuxer->video->id=stream_id;
} else
if(last_fccType==streamtypeAUDIO){
int z=(chunksize<64)?chunksize:64;
if(verbose>=2) printf("found 'wf', %d bytes of %d\n",chunksize,sizeof(WAVEFORMATEX));
stream_read(demuxer->stream,(char*) &avi_header.wf_ext,z);
chunksize-=z;
if(verbose>=1) print_wave_header((WAVEFORMATEX*)&avi_header.wf_ext);
// init_audio_codec();
// init_audio_out();
if(demuxer->audio->id==-1) demuxer->audio->id=stream_id;
}
break;
}
case ckidAVINEWINDEX: if(!no_index){
avi_header.idx_size=size2>>4;
if(verbose>=1) printf("Reading INDEX block, %d chunks for %d frames\n",
avi_header.idx_size,avi_header.avih.dwTotalFrames);
avi_header.idx=malloc(avi_header.idx_size<<4);
stream_read(demuxer->stream,(char*)avi_header.idx,avi_header.idx_size<<4);
chunksize-=avi_header.idx_size<<4;
if(verbose>=2) print_index();
break;
}
}
if(chunksize>0) stream_skip(demuxer->stream,chunksize); else
if(chunksize<0) printf("WARNING!!! chunksize=%d (id=%.4s)\n",chunksize,&id);
}
}
#undef MIN
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