mirror of
https://github.com/dborth/snes9xgx.git
synced 2024-11-24 11:39:21 +01:00
105 lines
2.0 KiB
C++
105 lines
2.0 KiB
C++
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/****************************************************************************
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* Snes9x 1.50
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*
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* Nintendo Gamecube Audio
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*
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* Audio is fixed to 32Khz/16bit/Stereo
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*
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* softdev July 2006
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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 "snes9x.h"
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#include "memmap.h"
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#include "debug.h"
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#include "cpuexec.h"
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#include "ppu.h"
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#include "apu.h"
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#include "display.h"
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#include "gfx.h"
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#include "soundux.h"
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#include "spc700.h"
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#include "spc7110.h"
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#include "controls.h"
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#include "video.h"
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#include "ftfont.h"
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/*** Double buffered audio ***/
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#define AUDIOBUFFER 2048
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static unsigned char soundbuffer[2][AUDIOBUFFER]
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__attribute__ ((__aligned__ (32)));
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static int whichab = 0; /*** Audio buffer flip switch ***/
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extern int ConfigRequested;
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#define AUDIOSTACK 16384
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lwpq_t audioqueue;
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lwp_t athread;
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static uint8 astack[AUDIOSTACK];
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/**
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* Audio Threading
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*/
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static void *
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AudioThread (void *arg)
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{
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LWP_InitQueue (&audioqueue);
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while (1)
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{
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whichab ^= 1;
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if (ConfigRequested)
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memset (soundbuffer[whichab], 0, AUDIOBUFFER);
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else
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{
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so.samples_mixed_so_far = so.play_position = 0;
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S9xMixSamples (soundbuffer[whichab], AUDIOBUFFER >> 1);
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}
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LWP_ThreadSleep (audioqueue);
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}
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return NULL;
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}
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/**
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* MixSamples
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* This continually calls S9xMixSamples On each DMA Completion
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*/
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static void
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GCMixSamples ()
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{
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AUDIO_StopDMA ();
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DCFlushRange (soundbuffer[whichab], AUDIOBUFFER);
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AUDIO_InitDMA ((u32) soundbuffer[whichab], AUDIOBUFFER);
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AUDIO_StartDMA ();
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LWP_ThreadSignal (audioqueue);
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}
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/**
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* InitGCAudio
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*/
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void
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InitGCAudio ()
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{
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AUDIO_SetDSPSampleRate (AI_SAMPLERATE_32KHZ);
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AUDIO_RegisterDMACallback (GCMixSamples);
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LWP_CreateThread (&athread, AudioThread, NULL, astack, AUDIOSTACK, 80);
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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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GCMixSamples ();
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}
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