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/*
audio.xaudio2 (2010-08-14)
author: OV2
*/
#include "xaudio2.hpp"
#include <windows.h>
namespace ruby {
class pAudioXAudio2: public IXAudio2VoiceCallback {
public:
IXAudio2* pXAudio2;
IXAudio2MasteringVoice* pMasterVoice;
IXAudio2SourceVoice* pSourceVoice;
//inherited from IXAudio2VoiceCallback
STDMETHODIMP_(void) OnBufferStart(void* pBufferContext){}
STDMETHODIMP_(void) OnLoopEnd(void* pBufferContext){}
STDMETHODIMP_(void) OnStreamEnd() {}
STDMETHODIMP_(void) OnVoiceError(void* pBufferContext, HRESULT Error) {}
STDMETHODIMP_(void) OnVoiceProcessingPassEnd() {}
STDMETHODIMP_(void) OnVoiceProcessingPassStart(UINT32 BytesRequired) {}
struct {
unsigned buffers;
unsigned latency;
uint32_t* buffer;
unsigned bufferoffset;
volatile long submitbuffers;
unsigned writebuffer;
} device;
struct {
bool synchronize;
unsigned frequency;
unsigned latency;
} settings;
bool cap(const string& name) {
if(name == Audio::Synchronize) return true;
if(name == Audio::Frequency) return true;
if(name == Audio::Latency) return true;
return false;
}
any get(const string& name) {
if(name == Audio::Synchronize) return settings.synchronize;
if(name == Audio::Frequency) return settings.frequency;
if(name == Audio::Latency) return settings.latency;
return false;
}
bool set(const string& name, const any& value) {
if(name == Audio::Synchronize) {
settings.synchronize = any_cast<bool>(value);
if(pXAudio2) clear();
return true;
}
if(name == Audio::Frequency) {
settings.frequency = any_cast<unsigned>(value);
if(pXAudio2) init();
return true;
}
if(name == Audio::Latency) {
settings.latency = any_cast<unsigned>(value);
if(pXAudio2) init();
return true;
}
return false;
}
void pushbuffer(unsigned bytes, uint32_t* pAudioData) {
XAUDIO2_BUFFER xa2buffer = {0};
xa2buffer.AudioBytes = bytes;
xa2buffer.pAudioData = reinterpret_cast<BYTE*>(pAudioData);
xa2buffer.pContext = 0;
InterlockedIncrement(&device.submitbuffers);
pSourceVoice->SubmitSourceBuffer(&xa2buffer);
}
void sample(uint16_t left, uint16_t right) {
device.buffer[device.writebuffer * device.latency + device.bufferoffset++] = left + (right << 16);
if(device.bufferoffset < device.latency) return;
device.bufferoffset = 0;
if(device.submitbuffers == device.buffers - 1) {
if(settings.synchronize == true) {
//wait until there is at least one other free buffer for the next sample
while(device.submitbuffers == device.buffers - 1) {
//Sleep(0);
}
} else { //we need one free buffer for the next sample, so ignore the current contents
return;
}
}
pushbuffer(device.latency * 4,device.buffer + device.writebuffer * device.latency);
device.writebuffer = (device.writebuffer + 1) % device.buffers;
}
void clear() {
if(!pSourceVoice) return;
pSourceVoice->Stop(0);
pSourceVoice->FlushSourceBuffers(); //calls OnBufferEnd for all currently submitted buffers
device.writebuffer = 0;
device.bufferoffset = 0;
if(device.buffer) memset(device.buffer, 0, device.latency * device.buffers * 4);
pSourceVoice->Start(0);
}
bool init() {
term();
device.buffers = 8;
device.latency = settings.frequency * settings.latency / device.buffers / 1000.0 + 0.5;
device.buffer = new uint32_t[device.latency * device.buffers];
device.bufferoffset = 0;
device.submitbuffers = 0;
HRESULT hr;
if(FAILED(hr = XAudio2Create(&pXAudio2, 0 , XAUDIO2_DEFAULT_PROCESSOR))) {
return false;
}
if(FAILED(hr = pXAudio2->CreateMasteringVoice( &pMasterVoice, 2, settings.frequency, 0, 0 , NULL))) {
return false;
}
WAVEFORMATEX wfx;
wfx.wFormatTag = WAVE_FORMAT_PCM;
wfx.nChannels = 2;
wfx.nSamplesPerSec = settings.frequency;
wfx.nBlockAlign = 4;
wfx.wBitsPerSample = 16;
wfx.nAvgBytesPerSec = wfx.nSamplesPerSec * wfx.nBlockAlign;
wfx.cbSize = 0;
if(FAILED(hr = pXAudio2->CreateSourceVoice(&pSourceVoice, (WAVEFORMATEX*)&wfx, XAUDIO2_VOICE_NOSRC , XAUDIO2_DEFAULT_FREQ_RATIO, this, NULL, NULL))) {
return false;
}
clear();
return true;
}
void term() {
if(pSourceVoice) {
pSourceVoice->Stop(0);
pSourceVoice->DestroyVoice();
pSourceVoice = nullptr;
}
if(pMasterVoice) {
pMasterVoice->DestroyVoice();
pMasterVoice = nullptr;
}
if(pXAudio2) {
pXAudio2->Release();
pXAudio2 = nullptr;
}
if(device.buffer) {
delete[] device.buffer;
device.buffer = nullptr;
}
}
STDMETHODIMP_(void) OnBufferEnd(void* pBufferContext) {
InterlockedDecrement(&device.submitbuffers);
}
pAudioXAudio2() {
pXAudio2 = nullptr;
pMasterVoice = nullptr;
pSourceVoice = nullptr;
device.buffer = nullptr;
device.bufferoffset = 0;
device.submitbuffers = 0;
device.writebuffer = 0;
settings.synchronize = false;
settings.frequency = 22050;
settings.latency = 120;
}
};
DeclareAudio(XAudio2)
};
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