1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
|
#include "xaudio2.hpp"
#include <windows.h>
struct AudioXAudio2 : Audio, public IXAudio2VoiceCallback {
~AudioXAudio2() { term(); }
IXAudio2* pXAudio2 = nullptr;
IXAudio2MasteringVoice* pMasterVoice = nullptr;
IXAudio2SourceVoice* pSourceVoice = nullptr;
//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 = 0;
unsigned latency = 0;
uint32_t* buffer = nullptr;
unsigned bufferoffset = 0;
volatile long submitbuffers = 0;
unsigned writebuffer = 0;
} device;
struct {
bool synchronize = false;
unsigned frequency = 22050;
unsigned latency = 120;
} settings;
auto cap(const string& name) -> bool {
if(name == Audio::Synchronize) return true;
if(name == Audio::Frequency) return true;
if(name == Audio::Latency) return true;
return false;
}
auto get(const string& name) -> any {
if(name == Audio::Synchronize) return settings.synchronize;
if(name == Audio::Frequency) return settings.frequency;
if(name == Audio::Latency) return settings.latency;
return {};
}
auto set(const string& name, const any& value) -> bool {
if(name == Audio::Synchronize && value.is<bool>()) {
settings.synchronize = value.get<bool>();
if(pXAudio2) clear();
return true;
}
if(name == Audio::Frequency && value.is<unsigned>()) {
settings.frequency = value.get<unsigned>();
if(pXAudio2) init();
return true;
}
if(name == Audio::Latency && value.is<unsigned>()) {
settings.latency = value.get<unsigned>();
if(pXAudio2) init();
return true;
}
return false;
}
auto pushbuffer(unsigned bytes, uint32_t* pAudioData) -> void {
XAUDIO2_BUFFER xa2buffer = {0};
xa2buffer.AudioBytes = bytes;
xa2buffer.pAudioData = reinterpret_cast<BYTE*>(pAudioData);
xa2buffer.pContext = 0;
InterlockedIncrement(&device.submitbuffers);
pSourceVoice->SubmitSourceBuffer(&xa2buffer);
}
auto sample(uint16_t left, uint16_t right) -> void {
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;
}
auto clear() -> void {
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);
}
auto init() -> bool {
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;
}
unsigned deviceCount = 0;
pXAudio2->GetDeviceCount(&deviceCount);
if(deviceCount == 0) { term(); return false; }
unsigned deviceID = 0;
for(unsigned deviceIndex = 0; deviceIndex < deviceCount; deviceIndex++) {
XAUDIO2_DEVICE_DETAILS deviceDetails;
memset(&deviceDetails, 0, sizeof(XAUDIO2_DEVICE_DETAILS));
pXAudio2->GetDeviceDetails(deviceIndex, &deviceDetails);
if(deviceDetails.Role & DefaultGameDevice) deviceID = deviceIndex;
}
if(FAILED(hr = pXAudio2->CreateMasteringVoice(&pMasterVoice, 2, settings.frequency, 0, deviceID, 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;
}
auto term() -> void {
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);
}
};
|
