mirror of
https://github.com/dborth/snes9xgx.git
synced 2024-11-01 00:15:14 +01:00
169 lines
3.7 KiB
C++
169 lines
3.7 KiB
C++
/****************************************************************************
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* Snes9x Nintendo Wii/Gamecube Port
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*
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* Tantric 2008-2023
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*
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* audio.cpp
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*
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* Audio driver
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* Audio is fixed to 32Khz/16bit/Stereo
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***************************************************************************/
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#include <gccore.h>
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#include <ogcsys.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <asndlib.h>
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#include "video.h"
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#include "snes9x/snes9x.h"
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#include "snes9x/memmap.h"
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#include "snes9x/cpuexec.h"
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#include "snes9x/ppu.h"
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#include "snes9x/apu/apu.h"
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#include "snes9x/display.h"
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#include "snes9x/gfx.h"
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#include "snes9x/spc7110.h"
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#include "snes9x/controls.h"
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extern int ScreenshotRequested;
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extern int ConfigRequested;
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/*** Double buffered audio ***/
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#define SAMPLES_TO_PROCESS 1024
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#define AUDIOBUFFER 2048
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#define BUFFERCOUNT 16
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static u8 soundbuffer[BUFFERCOUNT][AUDIOBUFFER] __attribute__ ((__aligned__ (32)));
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static int playab = 0;
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static int nextab = 0;
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static int unplayed = 0;
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static inline void updateUnplayed(int diff) {
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unplayed += diff;
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if(unplayed < 0) {
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unplayed = 0;
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}
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else if(unplayed > BUFFERCOUNT-1) {
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unplayed = BUFFERCOUNT-1;
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}
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}
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static void DMACallback () {
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if (!ScreenshotRequested && !ConfigRequested) {
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updateUnplayed(-1);
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AUDIO_InitDMA ((u32) soundbuffer[playab], AUDIOBUFFER);
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playab = (playab + 1) % BUFFERCOUNT;
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}
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}
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static void S9xAudioCallback (void *data) {
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double rate = 1.0;
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if(unplayed > 8) {
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rate = 1.005;
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}
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else if(unplayed < 4) {
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rate = 0.995;
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}
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S9xUpdateDynamicRate(rate);
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S9xFinalizeSamples();
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if (ScreenshotRequested || ConfigRequested) {
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AUDIO_StopDMA();
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}
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else if(S9xGetSampleCount() >= SAMPLES_TO_PROCESS) {
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S9xMixSamples (soundbuffer[nextab], SAMPLES_TO_PROCESS);
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DCFlushRange (soundbuffer[nextab], AUDIOBUFFER);
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updateUnplayed(1);
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nextab = (nextab + 1) % BUFFERCOUNT;
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if(!Settings.TurboMode && ((nextab + 1) % BUFFERCOUNT) == playab) {
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// quick and dirty attempt to prevent reading and writing from/to the same buffer
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nextab = (nextab + BUFFERCOUNT/2) % BUFFERCOUNT;
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}
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if(playab == -1) {
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if(unplayed > 2) {
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playab = 0;
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AUDIO_StartDMA();
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}
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}
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}
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}
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/****************************************************************************
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* InitAudio
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***************************************************************************/
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void
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InitAudio ()
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{
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#ifdef NO_SOUND
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AUDIO_Init (NULL);
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AUDIO_SetDSPSampleRate(AI_SAMPLERATE_48KHZ);
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AUDIO_RegisterDMACallback(DMACallback);
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#else
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ASND_Init();
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#endif
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}
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/****************************************************************************
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* SwitchAudioMode
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*
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* Switches between menu sound and emulator sound
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***************************************************************************/
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void
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SwitchAudioMode(int mode)
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{
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if(mode == 0) // emulator
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{
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#ifndef NO_SOUND
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ASND_Pause(1);
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ASND_End();
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AUDIO_StopDMA();
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AUDIO_RegisterDMACallback(NULL);
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DSP_Halt();
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AUDIO_RegisterDMACallback(DMACallback);
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#endif
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S9xSetSamplesAvailableCallback(S9xAudioCallback, NULL);
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}
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else // menu
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{
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S9xSetSamplesAvailableCallback(NULL, NULL);
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#ifndef NO_SOUND
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DSP_Unhalt();
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ASND_Init();
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ASND_Pause(0);
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#else
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AUDIO_StopDMA();
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#endif
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}
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}
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/****************************************************************************
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* ShutdownAudio
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*
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* Shuts down audio subsystem. Useful to avoid unpleasant sounds if a
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* crash occurs during shutdown.
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***************************************************************************/
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void ShutdownAudio()
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{
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AUDIO_StopDMA();
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}
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/****************************************************************************
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* AudioStart
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*
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* Called to kick off the Audio Queue
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***************************************************************************/
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void
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AudioStart ()
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{
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unplayed = 0;
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nextab = 0;
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playab = -1;
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}
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