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