unsigned short c64SidLoad(const char* filename, unsigned short* init_addr,
unsigned short* play_addr, unsigned char* sub_song_start,
unsigned char* max_sub_songs, unsigned char* speed, char* name,
char* author, char* copyright) {
FILE* f = fopen(filename, "rb");
if(!f) return 0;
// check header
char PSID[4];
if(!fread(PSID, 4, 1, f) && strncmp(PSID, "PSID", 4)) return 0;
fseek(f, 0x16, 0);
fread(name, 1, 32, f);
fread(author, 1, 32, f);
fread(copyright, 1, 32, f);
unsigned char sidmem[65536];
unsigned short load_addr;
rewind(f);
int len = fread(sidmem, 1, 65536, f);
fclose(f);
return LoadSIDFromMemory(sidmem, &load_addr, init_addr,
play_addr, max_sub_songs, sub_song_start, speed, len);
}
static int EMSCRIPTEN_KEEPALIVE loadSidFile(void * inBuffer, int inBufSize) {
sSampleRate= 44100; // TODO: extend API & use actual target sample rate
sInitAddr= 0;
sPlayAddr= 0;
sLoadEndAddr= 0;
sActualSubsong= 0;
sMaxSubsong= 0;
sPlaySpeed= 0;
sNtscMode= 0;
unsigned char sidmem[65536];
unsigned char *buffer = sidmem;
memcpy(buffer, inBuffer, inBufSize);
sIsPSID= (buffer[0x00]==0x50?1:0);
sSidVersion= buffer[0x05];
sIsC64compatible= (sSidVersion & 0x2) && ((buffer[0x77] & 0x2) == 0);
sNtscMode= (sSidVersion == 2) && !isRsid() && (buffer[0x77] & 0x8); // NTSC bit
int i;
for (i=0;i<32;i++) song_name[i] = buffer[0x16+i];
for (i=0;i<32;i++) song_author[i] = buffer[0x36+i];
for (i=0;i<32;i++) song_copyright[i] = buffer[0x56+i];
unsigned short load_addr;
LoadSIDFromMemory(sidmem, &load_addr, &sLoadEndAddr, &sInitAddr, &sPlayAddr, &sMaxSubsong,
&sActualSubsong, &sPlaySpeed, inBufSize);
memcpy(sMemorySnapshot, memory, MEMORY_SIZE);
loadResult[0]= &load_addr;
loadResult[1]= &sPlaySpeed;
loadResult[2]= &sMaxSubsong;
loadResult[3]= &sActualSubsong;
loadResult[4]= song_name;
loadResult[5]= song_author;
loadResult[6]= song_copyright;
return 0;
}
