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#ifdef CRSID_PLATFORM_PC
#include <SDL/SDL.h>
void cRSID_soundCallback(void* userdata, unsigned char *buf, int len) {
cRSID_generateSound( (cRSID_C64instance*)userdata, buf, len );
}
void* cRSID_initSound(cRSID_C64instance* C64, unsigned short samplerate, unsigned short buflen) {
static SDL_AudioSpec soundspec;
if ( SDL_Init(SDL_INIT_AUDIO) < 0 ) {
fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError()); return NULL;
}
soundspec.freq=samplerate; soundspec.channels=1; soundspec.format=AUDIO_S16;
soundspec.samples=buflen; soundspec.userdata=C64; soundspec.callback=cRSID_soundCallback;
if ( SDL_OpenAudio(&soundspec, NULL) < 0 ) {
fprintf(stderr, "Couldn't open audio: %s\n", SDL_GetError()); return NULL;
}
return (void*)&soundspec;
}
void cRSID_closeSound (void) {
SDL_PauseAudio(1); SDL_CloseAudio();
}
void cRSID_startSound (void) {
SDL_PauseAudio(0);
}
void cRSID_stopSound (void) {
SDL_PauseAudio(1);
}
void cRSID_generateSound(cRSID_C64instance* C64instance, unsigned char *buf, unsigned short len) {
static unsigned short i;
static int Output;
for(i=0;i<len;i+=2) {
Output=cRSID_generateSample(C64instance); //cRSID_emulateC64(C64instance);
//if (Output>=32767) Output=32767; else if (Output<=-32768) Output=-32768; //saturation logic on overflow
buf[i]=Output&0xFF; buf[i+1]=Output>>8;
}
}
#endif
signed short cRSID_generateSample (cRSID_C64instance* C64) { //call this from custom buffer-filler
static int Output;
Output=cRSID_emulateC64(C64);
if (C64->PSIDdigiMode) Output += cRSID_playPSIDdigi(C64);
if (Output>=32767) Output=32767; else if (Output<=-32768) Output=-32768; //saturation logic on overflow
return (signed short) Output;
}
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