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15c0f0576e
Needed to compile cRSID as a proper library. Change-Id: I276967f46037bd65db1ff38985a781183fc26a00
62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
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#ifdef CRSID_PLATFORM_PC
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#include <SDL/SDL.h>
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void cRSID_soundCallback(void* userdata, unsigned char *buf, int len) {
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cRSID_generateSound( (cRSID_C64instance*)userdata, buf, len );
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}
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void* cRSID_initSound(cRSID_C64instance* C64, unsigned short samplerate, unsigned short buflen) {
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static SDL_AudioSpec soundspec;
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if ( SDL_Init(SDL_INIT_AUDIO) < 0 ) {
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fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError()); return NULL;
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}
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soundspec.freq=samplerate; soundspec.channels=1; soundspec.format=AUDIO_S16;
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soundspec.samples=buflen; soundspec.userdata=C64; soundspec.callback=cRSID_soundCallback;
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if ( SDL_OpenAudio(&soundspec, NULL) < 0 ) {
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fprintf(stderr, "Couldn't open audio: %s\n", SDL_GetError()); return NULL;
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}
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return (void*)&soundspec;
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}
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void cRSID_closeSound (void) {
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SDL_PauseAudio(1); SDL_CloseAudio();
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}
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void cRSID_startSound (void) {
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SDL_PauseAudio(0);
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}
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void cRSID_stopSound (void) {
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SDL_PauseAudio(1);
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}
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void cRSID_generateSound(cRSID_C64instance* C64instance, unsigned char *buf, unsigned short len) {
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static unsigned short i;
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static int Output;
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for(i=0;i<len;i+=2) {
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Output=cRSID_generateSample(C64instance); //cRSID_emulateC64(C64instance);
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//if (Output>=32767) Output=32767; else if (Output<=-32768) Output=-32768; //saturation logic on overflow
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buf[i]=Output&0xFF; buf[i+1]=Output>>8;
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}
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}
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#endif
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signed short cRSID_generateSample (cRSID_C64instance* C64) { //call this from custom buffer-filler
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static int Output;
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Output=cRSID_emulateC64(C64);
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if (C64->PSIDdigiMode) Output += cRSID_playPSIDdigi(C64);
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if (Output>=32767) Output=32767; else if (Output<=-32768) Output=-32768; //saturation logic on overflow
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return (signed short) Output;
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}
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