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#include <avrt.h>
#include <mmdeviceapi.h>
#include <audioclient.h>
#include <audiopolicy.h>
#include <devicetopology.h>
#include <endpointvolume.h>
#include <nall/dsp.hpp>
struct AudioWASAPI : Audio {
~AudioWASAPI() { term(); }
struct {
bool exclusive = false;
bool synchronize = false;
uint frequency = 44100;
} settings;
auto cap(const string& name) -> bool {
if(name == Audio::Exclusive) return true;
if(name == Audio::Synchronize) return true;
if(name == Audio::Frequency) return true;
return false;
}
auto get(const string& name) -> any {
if(name == Audio::Exclusive) return settings.exclusive;
if(name == Audio::Synchronize) return settings.synchronize;
if(name == Audio::Frequency) return settings.frequency;
return {};
}
auto set(const string& name, const any& value) -> bool {
if(name == Audio::Exclusive && value.get<bool>()) {
settings.exclusive = value.get<bool>();
return true;
}
if(name == Audio::Synchronize && value.is<bool>()) {
settings.synchronize = value.get<bool>();
return true;
}
if(name == Audio::Frequency && value.is<uint>()) {
settings.frequency = value.get<uint>();
dsp.setFrequency(settings.frequency);
return true;
}
return false;
}
auto sample(uint16 left, uint16 right) -> void {
int samples[] = {(int16)left, (int16)right};
dsp.sample(samples);
while(dsp.pending()) {
dsp.read(samples);
write(samples);
}
}
auto clear() -> void {
audioClient->Stop();
renderClient->GetBuffer(bufferFrameCount, &bufferData);
renderClient->ReleaseBuffer(bufferFrameCount, 0);
audioClient->Start();
}
auto init() -> bool {
if(CoCreateInstance(CLSID_MMDeviceEnumerator, nullptr, CLSCTX_ALL, IID_IMMDeviceEnumerator, (void**)&enumerator) != S_OK) return false;
if(enumerator->GetDefaultAudioEndpoint(eRender, eConsole, &device) != S_OK) return false;
if(device->Activate(IID_IAudioClient, CLSCTX_ALL, nullptr, (void**)&audioClient) != S_OK) return false;
if(settings.exclusive) {
if(device->OpenPropertyStore(STGM_READ, &propertyStore) != S_OK) return false;
if(propertyStore->GetValue(PKEY_AudioEngine_DeviceFormat, &propVariant) != S_OK) return false;
waveFormat = (WAVEFORMATEX*)propVariant.blob.pBlobData;
if(audioClient->GetDevicePeriod(nullptr, &devicePeriod) != S_OK) return false;
if(audioClient->Initialize(AUDCLNT_SHAREMODE_EXCLUSIVE, 0, devicePeriod, devicePeriod, waveFormat, nullptr) != S_OK) return false;
taskHandle = AvSetMmThreadCharacteristics(L"Pro Audio", &taskIndex);
} else {
if(audioClient->GetMixFormat(&waveFormat) != S_OK) return false;
if(audioClient->GetDevicePeriod(&devicePeriod, nullptr)) return false;
if(audioClient->Initialize(AUDCLNT_SHAREMODE_SHARED, 0, devicePeriod, 0, waveFormat, nullptr) != S_OK) return false;
}
if(audioClient->GetService(IID_IAudioRenderClient, (void**)&renderClient) != S_OK) return false;
if(audioClient->GetBufferSize(&bufferFrameCount) != S_OK) return false;
switch(((WAVEFORMATEXTENSIBLE*)waveFormat)->SubFormat.Data1) {
case 1: ieee = false; break; //fixed point
case 3: ieee = true; break; //floating point
default: return false; //unknown format; abort
}
dsp.setChannels(2);
dsp.setPrecision(16);
dsp.setFrequency(settings.frequency);
dsp.setResampler(DSP::ResampleEngine::Linear);
dsp.setResamplerFrequency(waveFormat->nSamplesPerSec);
dsp.setChannels(waveFormat->nChannels);
dsp.setPrecision(waveFormat->wBitsPerSample);
print("[WASAPI]\n");
print("Channels: ", waveFormat->nChannels, "\n");
print("Precision: ", waveFormat->wBitsPerSample, "\n");
print("Frequency: ", waveFormat->nSamplesPerSec, "\n");
print("IEEE-754: ", ieee, "\n");
print("Exclusive: ", settings.exclusive, "\n\n");
audioClient->Start();
return true;
}
auto term() -> void {
if(audioClient) {
audioClient->Stop();
}
if(taskHandle) {
AvRevertMmThreadCharacteristics(taskHandle);
taskHandle = nullptr;
}
}
private:
auto write(int samples[]) -> void {
while(true) {
uint32 padding = 0;
audioClient->GetCurrentPadding(&padding);
if(bufferFrameCount - padding < 1) {
if(!settings.synchronize) return;
continue;
}
break;
}
renderClient->GetBuffer(1, &bufferData);
if(ieee) {
auto buffer = (float*)bufferData;
buffer[0] = (int16)samples[0] / 32768.0;
buffer[1] = (int16)samples[1] / 32768.0;
} else {
auto buffer = (int16*)bufferData;
buffer[0] = (int16)samples[0];
buffer[1] = (int16)samples[1];
}
renderClient->ReleaseBuffer(1, 0);
}
DSP dsp;
IMMDeviceEnumerator* enumerator = nullptr;
IMMDevice* device = nullptr;
IPropertyStore* propertyStore = nullptr;
IAudioClient* audioClient = nullptr;
IAudioRenderClient* renderClient = nullptr;
WAVEFORMATEX* waveFormat = nullptr;
PROPVARIANT propVariant;
HANDLE taskHandle = nullptr;
DWORD taskIndex = 0;
REFERENCE_TIME devicePeriod = 0;
uint32 bufferFrameCount = 0;
uint8* bufferData = nullptr;
bool ieee = false;
};
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