mirror of
https://github.com/mpv-player/mpv
synced 2024-12-15 11:25:10 +00:00
90 lines
3.1 KiB
C
90 lines
3.1 KiB
C
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#define MIN(a,b) (((a)<(b))?(a):(b))
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void read_avi_header(int no_index){
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int stream_id=-1;
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//---- AVI header:
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avi_header.idx_size=0;
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while(1){
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int id=stream_read_dword_le(demuxer->stream);
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int chunksize,size2;
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static int last_fccType=0;
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//
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if(stream_eof(demuxer->stream)) break;
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//
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if(id==mmioFOURCC('L','I','S','T')){
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int len=stream_read_dword_le(demuxer->stream)-4; // list size
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id=stream_read_dword_le(demuxer->stream); // list type
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if(verbose>=2) printf("LIST %.4s len=%d\n",&id,len);
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if(id==listtypeAVIMOVIE){
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// found MOVI header
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avi_header.movi_start=stream_tell(demuxer->stream);
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avi_header.movi_end=avi_header.movi_start+len;
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if(verbose>=1) printf("Found movie at 0x%X - 0x%X\n",avi_header.movi_start,avi_header.movi_end);
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len=(len+1)&(~1);
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stream_skip(demuxer->stream,len);
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}
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continue;
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}
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size2=stream_read_dword_le(demuxer->stream);
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if(verbose>=2) printf("CHUNK %.4s len=%d\n",&id,size2);
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chunksize=(size2+1)&(~1);
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switch(id){
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case ckidAVIMAINHDR: // read 'avih'
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stream_read(demuxer->stream,(char*) &avi_header.avih,MIN(size2,sizeof(avi_header.avih)));
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chunksize-=MIN(size2,sizeof(avi_header.avih));
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if(verbose) print_avih(&avi_header.avih);
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break;
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case ckidSTREAMHEADER: { // read 'strh'
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AVIStreamHeader h;
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stream_read(demuxer->stream,(char*) &h,MIN(size2,sizeof(h)));
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chunksize-=MIN(size2,sizeof(h));
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if(h.fccType==streamtypeVIDEO) memcpy(&avi_header.video,&h,sizeof(h));else
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if(h.fccType==streamtypeAUDIO) memcpy(&avi_header.audio,&h,sizeof(h));
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last_fccType=h.fccType;
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if(verbose>=1) print_strh(&h);
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++stream_id;
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break; }
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case ckidSTREAMFORMAT: { // read 'strf'
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if(last_fccType==streamtypeVIDEO){
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stream_read(demuxer->stream,(char*) &avi_header.bih,MIN(size2,sizeof(avi_header.bih)));
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chunksize-=MIN(size2,sizeof(avi_header.bih));
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// init_video_codec();
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// init_video_out();
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if(demuxer->video->id==-1) demuxer->video->id=stream_id;
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} else
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if(last_fccType==streamtypeAUDIO){
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int z=(chunksize<64)?chunksize:64;
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if(verbose>=2) printf("found 'wf', %d bytes of %d\n",chunksize,sizeof(WAVEFORMATEX));
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stream_read(demuxer->stream,(char*) &avi_header.wf_ext,z);
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chunksize-=z;
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if(verbose>=1) print_wave_header((WAVEFORMATEX*)&avi_header.wf_ext);
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// init_audio_codec();
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// init_audio_out();
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if(demuxer->audio->id==-1) demuxer->audio->id=stream_id;
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}
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break;
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}
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case ckidAVINEWINDEX: if(!no_index){
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avi_header.idx_size=size2>>4;
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if(verbose>=1) printf("Reading INDEX block, %d chunks for %d frames\n",
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avi_header.idx_size,avi_header.avih.dwTotalFrames);
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avi_header.idx=malloc(avi_header.idx_size<<4);
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stream_read(demuxer->stream,(char*)avi_header.idx,avi_header.idx_size<<4);
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chunksize-=avi_header.idx_size<<4;
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if(verbose>=2) print_index();
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break;
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}
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}
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if(chunksize>0) stream_skip(demuxer->stream,chunksize); else
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if(chunksize<0) printf("WARNING!!! chunksize=%d (id=%.4s)\n",chunksize,&id);
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}
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}
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#undef MIN
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