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#define MIN(a,b) (((a)<(b))?(a):(b))
void read_avi_header(int index_mode){
sh_audio_t *sh_audio=NULL;
sh_video_t *sh_video=NULL;
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));
++stream_id;
if(h.fccType==streamtypeVIDEO){
sh_video=new_sh_video(stream_id);
memcpy(&sh_video->video,&h,sizeof(h));
} else
if(h.fccType==streamtypeAUDIO){
sh_audio=new_sh_audio(stream_id);
memcpy(&sh_audio->audio,&h,sizeof(h));
}
last_fccType=h.fccType;
if(verbose>=1) print_strh(&h);
break; }
case ckidSTREAMFORMAT: { // read 'strf'
if(last_fccType==streamtypeVIDEO){
sh_video->bih=calloc((chunksize<sizeof(BITMAPINFOHEADER))?sizeof(BITMAPINFOHEADER):chunksize,1);
// sh_video->bih=malloc(chunksize); memset(sh_video->bih,0,chunksize);
if(verbose>=1) printf("found 'bih', %d bytes of %d\n",chunksize,sizeof(BITMAPINFOHEADER));
stream_read(demuxer->stream,(char*) sh_video->bih,chunksize);
chunksize=0;
// sh_video->fps=(float)sh_video->video.dwRate/(float)sh_video->video.dwScale;
// sh_video->frametime=(float)sh_video->video.dwScale/(float)sh_video->video.dwRate;
// if(demuxer->video->id==-1) demuxer->video->id=stream_id;
} else
if(last_fccType==streamtypeAUDIO){
sh_audio->wf=calloc((chunksize<sizeof(WAVEFORMATEX))?sizeof(WAVEFORMATEX):chunksize,1);
// sh_audio->wf=malloc(chunksize); memset(sh_audio->wf,0,chunksize);
if(verbose>=1) printf("found 'wf', %d bytes of %d\n",chunksize,sizeof(WAVEFORMATEX));
stream_read(demuxer->stream,(char*) sh_audio->wf,chunksize);
chunksize=0;
if(verbose>=1) print_wave_header(sh_audio->wf);
// if(demuxer->audio->id==-1) demuxer->audio->id=stream_id;
}
break;
}
case ckidAVINEWINDEX: if(index_mode){
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);
}
if(avi_header.idx_size==0 && index_mode==1){
// build index for file:
stream_reset(demuxer->stream);
stream_seek(demuxer->stream,avi_header.movi_start);
avi_header.idx_pos=0;
avi_header.idx=NULL;
while(1){
int id,len,skip;
AVIINDEXENTRY* idx;
demuxer->filepos=stream_tell(demuxer->stream);
if(demuxer->filepos>=avi_header.movi_end) break;
id=stream_read_dword_le(demuxer->stream);
len=stream_read_dword_le(demuxer->stream);
if(id==mmioFOURCC('L','I','S','T')){
id=stream_read_dword_le(demuxer->stream); // list type
continue;
}
if(stream_eof(demuxer->stream)) break;
if(avi_header.idx_pos<=avi_header.idx_size){
avi_header.idx_size+=32;
avi_header.idx=realloc(avi_header.idx,avi_header.idx_size*sizeof(AVIINDEXENTRY));
if(!avi_header.idx){avi_header.idx_pos=0; break;} // error!
}
idx=&avi_header.idx[avi_header.idx_pos++];
idx->ckid=id;
idx->dwFlags=AVIIF_KEYFRAME; // FIXME
idx->dwChunkOffset=demuxer->filepos;
idx->dwChunkLength=len;
if(verbose>=2) printf("0x%08X 0x%08X %.4s\n",demuxer->filepos,id,&id);
skip=(len+1)&(~1); // total bytes in this chunk
stream_skip(demuxer->stream,skip);
}
avi_header.idx_size=avi_header.idx_pos;
printf("AVI: Generated index table for %d chunks!\n",avi_header.idx_size);
}
}
#undef MIN
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