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[FAudio] Switch to portable `condition_variable` 

This removes remaining dependencies on Windows in the FAudio code by
removing the device notification code and switching to portable
`condition_variable` for the buffer end notification event.
This commit is contained in:
Fabrice de Gans 2024-04-07 12:42:08 -07:00 committed by Rafael Kitover
parent 0e503a525e
commit 8ef9a66b74
1 changed files with 35 additions and 144 deletions
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179
src/wx/audio/internal/faudio.cpp
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@ -7,13 +7,13 @@
#include <cassert>
#include <condition_variable>
#include <mutex>
#include <vector>
// FAudio
#include <FAudio.h>
#include <mmdeviceapi.h>
#include <wx/arrstr.h>
#include <wx/log.h>
#include <wx/translation.h>
@ -59,13 +59,19 @@ int FAGetDev(FAudio* fa) {
class FAudio_BufferNotify : public FAudioVoiceCallback {
public:
bool WaitForSignal() { return WaitForSingleObject(buffer_end_event_, 10000) != WAIT_TIMEOUT; }
// Waits for the buffer end event to be signaled for 10 seconds.
// Returns true if the buffer end event was signaled, false if the wait timed out.
bool WaitForSignal() {
std::unique_lock<std::mutex> lock(mutex_);
waiting_for_buffer_end_ = true;
const bool was_signaled =
buffer_end_cv_.wait_for(lock, std::chrono::seconds(10), [this] { return signaled_; });
waiting_for_buffer_end_ = false;
signaled_ = false;
return was_signaled;
}
FAudio_BufferNotify() {
buffer_end_event_ = nullptr;
buffer_end_event_ = CreateEvent(nullptr, FALSE, FALSE, nullptr);
assert(buffer_end_event_ != nullptr);
OnBufferEnd = &FAudio_BufferNotify::StaticOnBufferEnd;
OnVoiceProcessingPassStart = &FAudio_BufferNotify::StaticOnVoiceProcessingPassStart;
OnVoiceProcessingPassEnd = &FAudio_BufferNotify::StaticOnVoiceProcessingPassEnd;
@ -74,19 +80,32 @@ public:
OnLoopEnd = &FAudio_BufferNotify::StaticOnLoopEnd;
OnVoiceError = &FAudio_BufferNotify::StaticOnVoiceError;
}
~FAudio_BufferNotify() {
CloseHandle(buffer_end_event_);
buffer_end_event_ = nullptr;
}
~FAudio_BufferNotify() = default;
private:
void* buffer_end_event_;
// Signals that the buffer end event has occurred.
void SignalBufferEnd() {
std::lock_guard<std::mutex> lock(mutex_);
if (!waiting_for_buffer_end_) {
return;
}
signaled_ = true;
buffer_end_cv_.notify_one();
}
// Protects `waiting_for_buffer_end_` and `signaled_`.
std::mutex mutex_;
// Used to wait for the buffer end event.
std::condition_variable buffer_end_cv_;
// Set to true when we are waiting for the buffer end event.
// Must be protected by `mutex_`.
bool waiting_for_buffer_end_ = false;
// Set to true when the buffer end event has been signaled.
// Must be protected by `mutex_`.
bool signaled_ = false;
static void StaticOnBufferEnd(FAudioVoiceCallback* callback, void*) {
FAudio_BufferNotify* self = static_cast<FAudio_BufferNotify*>(callback);
if (self != nullptr && self->buffer_end_event_ != nullptr) {
SetEvent(self->buffer_end_event_);
}
static_cast<FAudio_BufferNotify*>(callback)->SignalBufferEnd();
}
static void StaticOnVoiceProcessingPassStart(FAudioVoiceCallback*, uint32_t) {}
static void StaticOnVoiceProcessingPassEnd(FAudioVoiceCallback*) {}
@ -133,36 +152,6 @@ private:
FAudio_BufferNotify notify; // buffer end notification
};
class FAudio_Device_Notifier : public IMMNotificationClient {
private:
volatile LONG registered;
IMMDeviceEnumerator* pEnumerator;
std::wstring last_device;
CRITICAL_SECTION lock;
std::vector<FAudio_Output*> instances;
public:
FAudio_Device_Notifier();
~FAudio_Device_Notifier();
ULONG STDMETHODCALLTYPE AddRef();
ULONG STDMETHODCALLTYPE Release();
HRESULT STDMETHODCALLTYPE QueryInterface(REFIID riid, VOID** ppvInterface);
HRESULT STDMETHODCALLTYPE OnDefaultDeviceChanged(EDataFlow flow,
ERole role,
LPCWSTR pwstrDeviceId);
HRESULT STDMETHODCALLTYPE OnDeviceAdded(LPCWSTR pwstrDeviceId);
HRESULT STDMETHODCALLTYPE OnDeviceRemoved(LPCWSTR pwstrDeviceId);
HRESULT STDMETHODCALLTYPE OnDeviceStateChanged(LPCWSTR pwstrDeviceId, DWORD dwNewState);
HRESULT STDMETHODCALLTYPE OnPropertyValueChanged(LPCWSTR pwstrDeviceId, const PROPERTYKEY key);
void do_register(FAudio_Output* p_instance);
void do_unregister(FAudio_Output* p_instance);
};
FAudio_Device_Notifier f_notifier;
// Class Implementation
FAudio_Output::FAudio_Output() : buffer_count_(OPTION(kSoundBuffers)) {
failed = false;
@ -176,11 +165,9 @@ FAudio_Output::FAudio_Output() : buffer_count_(OPTION(kSoundBuffers)) {
sVoice = nullptr;
memset(&buf, 0, sizeof(buf));
memset(&vState, 0, sizeof(vState));
f_notifier.do_register(this);
}
FAudio_Output::~FAudio_Output() {
f_notifier.do_unregister(this);
close();
}
@ -478,102 +465,6 @@ void FAudio_Output::setThrottle(unsigned short throttle_) {
assert(hr == 0);
}
FAudio_Device_Notifier::FAudio_Device_Notifier() : registered(0) {
InitializeCriticalSection(&lock);
}
FAudio_Device_Notifier::~FAudio_Device_Notifier() {
DeleteCriticalSection(&lock);
}
ULONG STDMETHODCALLTYPE FAudio_Device_Notifier::AddRef() {
return 1;
}
ULONG STDMETHODCALLTYPE FAudio_Device_Notifier::Release() {
return 1;
}
HRESULT STDMETHODCALLTYPE FAudio_Device_Notifier::QueryInterface(REFIID riid, VOID** ppvInterface) {
if (IID_IUnknown == riid) {
*ppvInterface = (IUnknown*)this;
} else if (__uuidof(IMMNotificationClient) == riid) {
*ppvInterface = (IMMNotificationClient*)this;
} else {
*ppvInterface = nullptr;
return E_NOINTERFACE;
}
return S_OK;
}
HRESULT STDMETHODCALLTYPE FAudio_Device_Notifier::OnDefaultDeviceChanged(EDataFlow flow,
ERole,
LPCWSTR pwstrDeviceId) {
if (flow == eRender && last_device.compare(pwstrDeviceId) != 0) {
last_device = pwstrDeviceId;
EnterCriticalSection(&lock);
for (auto it = instances.begin(); it < instances.end(); ++it) {
(*it)->device_change();
}
LeaveCriticalSection(&lock);
}
return S_OK;
}
HRESULT STDMETHODCALLTYPE FAudio_Device_Notifier::OnDeviceAdded(LPCWSTR) {
return S_OK;
}
HRESULT STDMETHODCALLTYPE FAudio_Device_Notifier::OnDeviceRemoved(LPCWSTR) {
return S_OK;
}
HRESULT STDMETHODCALLTYPE FAudio_Device_Notifier::OnDeviceStateChanged(LPCWSTR, DWORD) {
return S_OK;
}
HRESULT STDMETHODCALLTYPE FAudio_Device_Notifier::OnPropertyValueChanged(LPCWSTR,
const PROPERTYKEY) {
return S_OK;
}
void FAudio_Device_Notifier::do_register(FAudio_Output* p_instance) {
if (InterlockedIncrement(&registered) == 1) {
pEnumerator = nullptr;
HRESULT hr = CoCreateInstance(__uuidof(MMDeviceEnumerator), nullptr, CLSCTX_INPROC_SERVER,
__uuidof(IMMDeviceEnumerator), (void**)&pEnumerator);
if (SUCCEEDED(hr)) {
pEnumerator->RegisterEndpointNotificationCallback(this);
}
}
EnterCriticalSection(&lock);
instances.push_back(p_instance);
LeaveCriticalSection(&lock);
}
void FAudio_Device_Notifier::do_unregister(FAudio_Output* p_instance) {
if (InterlockedDecrement(&registered) == 0) {
if (pEnumerator) {
pEnumerator->UnregisterEndpointNotificationCallback(this);
pEnumerator->Release();
pEnumerator = nullptr;
}
}
EnterCriticalSection(&lock);
for (auto it = instances.begin(); it < instances.end(); ++it) {
if (*it == p_instance) {
instances.erase(it);
break;
}
}
LeaveCriticalSection(&lock);
}
} // namespace
std::vector<AudioDevice> GetFAudioDevices() {