mirror of https://github.com/mpv-player/mpv
183 lines
7.0 KiB
C
183 lines
7.0 KiB
C
// .asf fileformat docs from http://divx.euro.ru
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typedef struct __attribute__((packed)) {
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unsigned char guid[16];
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unsigned long long size;
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} ASF_obj_header_t;
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typedef struct __attribute__((packed)) {
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ASF_obj_header_t objh;
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unsigned int cno; // number of subchunks
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unsigned char v1; // unknown (0x01)
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unsigned char v2; // unknown (0x02)
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} ASF_header_t;
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typedef struct __attribute__((packed)) {
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unsigned char client[16]; // Client GUID
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unsigned long long file_size;
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unsigned long long creat_time; //File creation time FILETIME 8
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unsigned long long packets; //Number of packets UINT64 8
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unsigned long long end_timestamp; //Timestamp of the end position UINT64 8
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unsigned long long duration; //Duration of the playback UINT64 8
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unsigned long start_timestamp; //Timestamp of the start position UINT32 4
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unsigned long unk1; //Unknown, maybe reserved ( usually contains 0 ) UINT32 4
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unsigned long flags; //Unknown, maybe flags ( usually contains 2 ) UINT32 4
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unsigned long packetsize; //Size of packet, in bytes UINT32 4
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unsigned long packetsize2; //Size of packet ( confirm ) UINT32 4
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unsigned long frame_size; //Size of uncompressed video frame UINT32 4
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} ASF_file_header_t;
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typedef struct __attribute__((packed)) {
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unsigned char type[16]; // Stream type (audio/video) GUID 16
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unsigned char concealment[16]; // Audio error concealment type GUID 16
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unsigned long long unk1; // Unknown, maybe reserved ( usually contains 0 ) UINT64 8
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unsigned long type_size; //Total size of type-specific data UINT32 4
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unsigned long stream_size; //Size of stream-specific data UINT32 4
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unsigned short stream_no; //Stream number UINT16 2
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unsigned long unk2; //Unknown UINT32 4
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} ASF_stream_header_t;
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ASF_header_t asfh;
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ASF_obj_header_t objh;
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ASF_file_header_t fileh;
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ASF_stream_header_t streamh;
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unsigned char* asf_packet=NULL;
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//int asf_video_id=-1;
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int asf_scrambling_h=1;
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int asf_scrambling_w=1;
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int asf_scrambling_b=1;
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int i;
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void asf_descrambling(unsigned char *src,int len){
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unsigned char *dst=malloc(len);
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unsigned char *s2=src;
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int i=0,x,y;
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while(len-i>=asf_scrambling_h*asf_scrambling_w*asf_scrambling_b){
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// printf("descrambling! (w=%d b=%d)\n",w,asf_scrambling_b);
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//i+=asf_scrambling_h*asf_scrambling_w;
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for(x=0;x<asf_scrambling_w;x++)
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for(y=0;y<asf_scrambling_h;y++){
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memcpy(dst+i,s2+(y*asf_scrambling_w+x)*asf_scrambling_b,asf_scrambling_b);
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i+=asf_scrambling_b;
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}
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s2+=asf_scrambling_h*asf_scrambling_w*asf_scrambling_b;
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}
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//if(i<len) memcpy(dst+i,src+i,len-i);
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memcpy(src,dst,i);
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free(dst);
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}
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char* asf_chunk_type(unsigned char* guid){
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switch(*((unsigned int*)guid)){
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case 0xF8699E40: return "guid_audio_stream";
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case 0xBC19EFC0: return "guid_video_stream";
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case 0x49f1a440: return "guid_audio_conceal_none";
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case 0xbfc3cd50: return "guid_audio_conceal_interleave";
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case 0x75B22630: return "guid_header";
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case 0x75b22636: return "guid_data_chunk";
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case 0x33000890: return "guid_index_chunk";
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case 0xB7DC0791: return "guid_stream_header";
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case 0xD6E229D1: return "guid_header_2_0";
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case 0x8CABDCA1: return "guid_file_header";
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}
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return NULL;
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}
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int asf_check_header(){
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unsigned char asfhdrguid[16]={0x30,0x26,0xB2,0x75,0x8E,0x66,0xCF,0x11,0xA6,0xD9,0x00,0xAA,0x00,0x62,0xCE,0x6C};
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stream_read(demuxer->stream,(char*) &asfh,sizeof(asfh)); // header obj
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// for(i=0;i<16;i++) printf(" %02X",temp[i]);printf("\n");
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// for(i=0;i<16;i++) printf(" %02X",asfhdrguid[i]);printf("\n");
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if(memcmp(asfhdrguid,asfh.objh.guid,16)){
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if(verbose) printf("ASF_check: not ASF guid!\n");
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return 0; // not ASF guid
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}
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if(asfh.cno>256){
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if(verbose) printf("ASF_check: invalid subchunks_no %d\n",(int) asfh.cno);
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return 0; // invalid header???
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}
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return 1;
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}
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int read_asf_header(){
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unsigned char buffer[512];
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#if 1
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printf("ASF file! (subchunks: %d)\n",asfh.cno);
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while(!stream_eof(demuxer->stream)){
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int pos,endpos;
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pos=stream_tell(demuxer->stream);
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stream_read(demuxer->stream,(char*) &objh,sizeof(objh));
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if(stream_eof(demuxer->stream)) break; // EOF
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endpos=pos+objh.size;
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// for(i=0;i<16;i++) printf("%02X ",objh.guid[i]);
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printf("0x%08X [%s] %d\n",pos, asf_chunk_type(objh.guid),(int) objh.size);
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switch(*((unsigned int*)&objh.guid)){
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case 0xB7DC0791: // guid_stream_header
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stream_read(demuxer->stream,(char*) &streamh,sizeof(streamh));
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printf("stream type: %s\n",asf_chunk_type(streamh.type));
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printf("stream concealment: %s\n",asf_chunk_type(streamh.concealment));
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printf("type: %d bytes, stream: %d bytes ID: %d\n",(int)streamh.type_size,(int)streamh.stream_size,(int)streamh.stream_no);
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printf("unk1: %lX unk2: %X\n",streamh.unk1,streamh.unk2);
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printf("FILEPOS=0x%X\n",stream_tell(demuxer->stream));
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// type-specific data:
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stream_read(demuxer->stream,(char*) buffer,streamh.type_size);
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switch(*((unsigned int*)&streamh.type)){
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case 0xF8699E40: // guid_audio_stream
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memcpy(avi_header.wf_ext,buffer,streamh.type_size<64?streamh.type_size:64);
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if(verbose>=1) print_wave_header((WAVEFORMATEX*)buffer);
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if((*((unsigned int*)&streamh.concealment))==0xbfc3cd50){
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stream_read(demuxer->stream,(char*) buffer,streamh.stream_size);
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asf_scrambling_h=buffer[0];
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asf_scrambling_w=(buffer[2]<<8)|buffer[1];
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asf_scrambling_b=(buffer[4]<<8)|buffer[3];
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asf_scrambling_w/=asf_scrambling_b;
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} else {
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asf_scrambling_b=asf_scrambling_h=asf_scrambling_w=1;
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}
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printf("ASF audio scrambling: %d x %d x %d\n",asf_scrambling_h,asf_scrambling_w,asf_scrambling_b);
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if(demuxer->audio->id==-1) demuxer->audio->id=streamh.stream_no & 0x7F;
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break;
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case 0xBC19EFC0: // guid_video_stream
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memcpy(&avi_header.bih,&buffer[4+4+1+2],sizeof(BITMAPINFOHEADER));
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if(verbose>=1) print_video_header((BITMAPINFOHEADER*)&buffer[4+4+1+2]);
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//asf_video_id=streamh.stream_no & 0x7F;
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if(demuxer->video->id==-1) demuxer->video->id=streamh.stream_no & 0x7F;
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break;
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}
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// stream-specific data:
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// stream_read(demuxer->stream,(char*) buffer,streamh.stream_size);
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break;
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// case 0xD6E229D1: return "guid_header_2_0";
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case 0x8CABDCA1: // guid_file_header
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stream_read(demuxer->stream,(char*) &fileh,sizeof(fileh));
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printf("packets: %d flags: %d pack_size: %d frame_size: %d\n",(int)fileh.packets,(int)fileh.flags,(int)fileh.packetsize,(int)fileh.frame_size);
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asf_packet=malloc(fileh.packetsize); // !!!
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break;
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case 0x75b22636: // guid_data_chunk
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avi_header.movi_start=stream_tell(demuxer->stream)+26;
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avi_header.movi_end=endpos;
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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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break;
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// case 0x33000890: return "guid_index_chunk";
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} // switch GUID
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if(!stream_seek(demuxer->stream,endpos)) break;
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} // while EOF
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#if 0
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if(verbose){
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printf("ASF duration: %d\n",(int)fileh.duration);
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printf("ASF start pts: %d\n",(int)fileh.start_timestamp);
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printf("ASF end pts: %d\n",(int)fileh.end_timestamp);
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}
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#endif
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#endif
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return 1;
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}
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