#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