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// cRSID lightweight RealSID (integer-only) library-header (with API-calls) by Hermit (Mihaly Horvath)
#ifndef LIBCRSID_HEADER
#define LIBCRSID_HEADER //used to prevent double inclusion of this header-file
enum cRSID_Specifications { CRSID_SIDCOUNT_MAX=3, CRSID_CIACOUNT=2 };
enum cRSID_StatusCodes { CRSID_STATUS_OK=0, CRSID_ERROR_INIT=-1, CRSID_ERROR_LOAD=-2 };
typedef struct cRSID_SIDheader cRSID_SIDheader;
typedef struct cRSID_C64instance cRSID_C64instance;
extern cRSID_C64instance cRSID_C64; //the only global object (for faster & simpler access than with struct-pointers, in some places)
// Main API functions (mainly in libcRSID.c)
cRSID_C64instance* cRSID_init (unsigned short samplerate, unsigned short buflen); //init emulation objects and sound
#ifdef CRSID_PLATFORM_PC
char cRSID_playSIDfile (cRSID_C64instance* C64, char* filename, char subtune); //simple single-call SID playback
cRSID_SIDheader* cRSID_loadSIDtune (cRSID_C64instance* C64, char* filename); //load and process SID-filedata to C64 memory
void cRSID_playSIDtune (void); //start/continue playback (enable playing audio-buffer)
void cRSID_pauseSIDtune (void); //pause playback (enable playing audio-buffer)
void cRSID_close (void); //close sound etc.
#endif
cRSID_SIDheader* cRSID_processSIDfile (cRSID_C64instance* C64, unsigned char* filedata, int filesize); //in host/file.c, copy SID-data to C64 memory
void cRSID_initSIDtune (cRSID_C64instance* C64, cRSID_SIDheader* SIDheader, char subtune); //init tune/subtune
signed short cRSID_generateSample (cRSID_C64instance* C64); //in host/audio.c, calculate a single sample
struct cRSID_SIDheader { //Offset: default/info:
unsigned char MagicString[4]; //$00 - "PSID" or "RSID" (RSID must provide Reset-circumstances & CIA/VIC-interrupts)
unsigned char VersionH00; //$04
unsigned char Version; //$05 - 1 for PSID v1, 2..4 for PSID v2..4 or RSID v2..4 (3/4 has 2SID/3SID support)
unsigned char HeaderSizeH00; //$06
unsigned char HeaderSize; //$07 - $76 for v1, $7C for v2..4
unsigned char LoadAddressH,LoadAddressL; //$08 - if 0 it's a PRG and its loadaddress is used (RSID: 0, PRG-loadaddress>=$07E8)
unsigned char InitAddressH,InitAddressL; //$0A - if 0 it's taken from load-address (but should be set) (RSID: don't point to ROM, 0 if BASICflag set)
unsigned char PlayAddressH,PlayAddressL; //$0C - if 0 play-routine-call is set by the initializer (always true for RSID)
unsigned char SubtuneAmountH00; //$0E
unsigned char SubtuneAmount; //$0F - 1..256
unsigned char DefaultSubtuneH00; //$10
unsigned char DefaultSubtune; //$11 - 1..256 (optional, defaults to 1)
unsigned char SubtuneTimeSources[4]; //$12 - 0:Vsync / 1:CIA1 (for PSID) (LSB is subtune1, MSB above 32) , always 0 for RSID
char Title[32]; //$16 - strings are using 1252 codepage
char Author[32]; //$36
char ReleaseInfo[32]; //$56
//SID v2 additions: (if SID2/SID3 model is set to unknown, they're set to the same model as SID1)
unsigned char ModelFormatStandardH; //$76 - bit9&8/7&6/5&4: SID3/2/1 model (00:?,01:6581,10:8580,11:both), bit3&2:VideoStandard..
unsigned char ModelFormatStandard; //$77 ..(01:PAL,10:NTSC,11:both), bit1:(0:C64,1:PlaySIDsamples/RSID_BASICflag), bit0:(0:builtin-player,1:MUS)
unsigned char RelocStartPage; //$78 - v2NG specific, if 0 the SID doesn't write outside its data-range, if $FF there's no place for driver
unsigned char RelocFreePages; //$79 - size of area from RelocStartPage for driver-relocation (RSID: must not contain ROM or 0..$3FF)
unsigned char SID2baseAddress; //$7A - (SID2BASE-$d000)/16 //SIDv3-relevant, only $42..$FE values are valid ($d420..$DFE0), else no SID2
unsigned char SID3baseAddress; //$7B - (SID3BASE-$d000)/16 //SIDv4-relevant, only $42..$FE values are valid ($d420..$DFE0), else no SID3
}; //music-program follows right after the header
#endif //LIBCRSID_HEADER
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