AudioCommon: Implement WASAPI

Source/Core/AudioCommon/AudioCommon.cpp

@@ -10,6 +10,7 @@
 #include "AudioCommon/OpenALStream.h"
 #include "AudioCommon/OpenSLESStream.h"
 #include "AudioCommon/PulseAudioStream.h"
+#include "AudioCommon/WASAPIStream.h"
 #include "AudioCommon/XAudio2Stream.h"
 #include "AudioCommon/XAudio2_7Stream.h"
 #include "Common/Common.h"
@@ -50,6 +51,8 @@ void InitSoundStream()
     g_sound_stream = std::make_unique<PulseAudio>();
   else if (backend == BACKEND_OPENSLES && OpenSLESStream::isValid())
     g_sound_stream = std::make_unique<OpenSLESStream>();
+  else if (backend == BACKEND_WASAPI && WASAPIStream::isValid())
+    g_sound_stream = std::make_unique<WASAPIStream>();
 
   if (!g_sound_stream || !g_sound_stream->Init())
   {
@@ -110,6 +113,9 @@ std::vector<std::string> GetSoundBackends()
     backends.push_back(BACKEND_OPENAL);
   if (OpenSLESStream::isValid())
     backends.push_back(BACKEND_OPENSLES);
+  if (WASAPIStream::isValid())
+    backends.push_back(BACKEND_WASAPI);
+
   return backends;
 }
 
@@ -128,7 +134,7 @@ bool SupportsDPL2Decoder(const std::string& backend)
 
 bool SupportsLatencyControl(const std::string& backend)
 {
-  return backend == BACKEND_OPENAL;
+  return backend == BACKEND_OPENAL || backend == BACKEND_WASAPI;
 }
 
 bool SupportsVolumeChanges(const std::string& backend)
@@ -136,7 +142,8 @@ bool SupportsVolumeChanges(const std::string& backend)
   // FIXME: this one should ask the backend whether it supports it.
   //       but getting the backend from string etc. is probably
   //       too much just to enable/disable a stupid slider...
-  return backend == BACKEND_CUBEB || backend == BACKEND_OPENAL || backend == BACKEND_XAUDIO2;
+  return backend == BACKEND_CUBEB || backend == BACKEND_OPENAL || backend == BACKEND_XAUDIO2 ||
+         backend == BACKEND_WASAPI;
 }
 
 void UpdateSoundStream()
@@ -231,4 +238,4 @@ void ToggleMuteVolume()
   isMuted = !isMuted;
   UpdateSoundStream();
 }
-}
+}  // namespace AudioCommon

Source/Core/AudioCommon/AudioCommon.vcxproj

@@ -44,6 +44,7 @@
     <ClCompile Include="Mixer.cpp" />
     <ClCompile Include="NullSoundStream.cpp" />
     <ClCompile Include="OpenALStream.cpp" />
+    <ClCompile Include="WASAPIStream.cpp" />
     <ClCompile Include="WaveFile.cpp" />
     <ClCompile Include="XAudio2Stream.cpp" />
     <ClCompile Include="XAudio2_7Stream.cpp">
@@ -63,6 +64,7 @@
     <ClInclude Include="OpenSLESStream.h" />
     <ClInclude Include="PulseAudioStream.h" />
     <ClInclude Include="SoundStream.h" />
+    <ClInclude Include="WASAPIStream.h" />
     <ClInclude Include="WaveFile.h" />
     <ClInclude Include="XAudio2Stream.h" />
     <ClInclude Include="XAudio2_7Stream.h" />
@@ -81,4 +83,4 @@
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>
-</Project>
+</Project>

Source/Core/AudioCommon/AudioCommon.vcxproj.filters

@@ -27,6 +27,9 @@
     <ClCompile Include="CubebStream.cpp">
       <Filter>SoundStreams</Filter>
     </ClCompile>
+    <ClCompile Include="WASAPIStream.cpp">
+      <Filter>SoundStreams</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="AudioCommon.h" />
@@ -62,8 +65,11 @@
     <ClInclude Include="CubebStream.h">
       <Filter>SoundStreams</Filter>
     </ClInclude>
+    <ClInclude Include="WASAPIStream.h">
+      <Filter>SoundStreams</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <Text Include="CMakeLists.txt" />
   </ItemGroup>
-</Project>
+</Project>

Source/Core/AudioCommon/CMakeLists.txt

@@ -47,6 +47,7 @@ else()
 endif()
 
 if(WIN32)
+  target_sources(audiocommon PRIVATE WASAPIStream.cpp)
   target_sources(audiocommon PRIVATE XAudio2Stream.cpp)
 
   add_library(audiocommon_xaudio27 "XAudio2_7Stream.cpp")

Source/Core/AudioCommon/WASAPIStream.cpp

@@ -0,0 +1,451 @@
+// Copyright 2018 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include "AudioCommon/WASAPIStream.h"
+
+#ifdef _WIN32
+
+// clang-format off
+#include <Audioclient.h>
+#include <comdef.h>
+#include <mmdeviceapi.h>
+#include <devpkey.h>
+#include <functiondiscoverykeys_devpkey.h>
+#include <thread>
+// clang-format on
+
+#include "Common/Logging/Log.h"
+#include "Common/StringUtil.h"
+#include "Common/Thread.h"
+#include "Core/ConfigManager.h"
+#include "VideoCommon/OnScreenDisplay.h"
+
+WASAPIStream::WASAPIStream()
+{
+  CoInitialize(nullptr);
+
+  m_format.Format.wFormatTag = WAVE_FORMAT_EXTENSIBLE;
+  m_format.Format.nChannels = 2;
+  m_format.Format.nSamplesPerSec = GetMixer()->GetSampleRate();
+  m_format.Format.nAvgBytesPerSec = m_format.Format.nSamplesPerSec * 4;
+  m_format.Format.nBlockAlign = 4;
+  m_format.Format.wBitsPerSample = 16;
+  m_format.Format.cbSize = sizeof(WAVEFORMATEXTENSIBLE) - sizeof(WAVEFORMATEX);
+  m_format.Samples.wValidBitsPerSample = m_format.Format.wBitsPerSample;
+  m_format.dwChannelMask = SPEAKER_FRONT_LEFT | SPEAKER_FRONT_RIGHT;
+  m_format.SubFormat = KSDATAFORMAT_SUBTYPE_PCM;
+}
+
+WASAPIStream::~WASAPIStream()
+{
+  if (m_enumerator)
+    m_enumerator->Release();
+
+  if (m_need_data_event)
+    CloseHandle(m_need_data_event);
+
+  if (m_running)
+  {
+    m_running = false;
+    if (m_thread.joinable())
+      m_thread.join();
+  }
+
+  CoUninitialize();
+}
+
+bool WASAPIStream::isValid()
+{
+  return true;
+}
+
+static bool HandleWinAPI(std::string message, HRESULT result)
+{
+  if (result != S_OK)
+  {
+    _com_error err(result);
+    std::string error = TStrToUTF8(err.ErrorMessage()).c_str();
+
+    switch (result)
+    {
+    case AUDCLNT_E_DEVICE_IN_USE:
+      error = "Audio endpoint already in use!";
+      break;
+    }
+
+    ERROR_LOG(AUDIO, "WASAPI: %s: %s", message.c_str(), error.c_str());
+  }
+
+  return result == S_OK;
+}
+
+std::vector<std::string> WASAPIStream::GetAvailableDevices()
+{
+  CoInitialize(nullptr);
+
+  IMMDeviceEnumerator* enumerator = nullptr;
+
+  HRESULT result =
+      CoCreateInstance(__uuidof(MMDeviceEnumerator), nullptr, CLSCTX_INPROC_SERVER,
+                       __uuidof(IMMDeviceEnumerator), reinterpret_cast<LPVOID*>(&enumerator));
+
+  if (!HandleWinAPI("Failed to create MMDeviceEnumerator", result))
+    return {};
+
+  std::vector<std::string> device_names;
+  IMMDeviceCollection* devices;
+  result = enumerator->EnumAudioEndpoints(eRender, DEVICE_STATE_ACTIVE, &devices);
+
+  if (!HandleWinAPI("Failed to get available devices", result))
+  {
+    CoUninitialize();
+    return {};
+  }
+
+  UINT count;
+  devices->GetCount(&count);
+
+  for (u32 i = 0; i < count; i++)
+  {
+    IMMDevice* device;
+    devices->Item(i, &device);
+    if (!HandleWinAPI("Failed to get device " + std::to_string(i), result))
+      continue;
+
+    LPWSTR device_id;
+    device->GetId(&device_id);
+
+    IPropertyStore* device_properties;
+
+    result = device->OpenPropertyStore(STGM_READ, &device_properties);
+
+    if (!HandleWinAPI("Failed to initialize IPropertyStore", result))
+      continue;
+
+    PROPVARIANT device_name;
+    PropVariantInit(&device_name);
+
+    device_properties->GetValue(PKEY_Device_FriendlyName, &device_name);
+
+    device_names.push_back(TStrToUTF8(device_name.pwszVal));
+
+    PropVariantClear(&device_name);
+  }
+
+  devices->Release();
+  enumerator->Release();
+
+  CoUninitialize();
+
+  return device_names;
+}
+
+IMMDevice* WASAPIStream::GetDeviceByName(std::string name)
+{
+  CoInitialize(nullptr);
+
+  IMMDeviceEnumerator* enumerator = nullptr;
+
+  HRESULT result =
+      CoCreateInstance(__uuidof(MMDeviceEnumerator), nullptr, CLSCTX_INPROC_SERVER,
+                       __uuidof(IMMDeviceEnumerator), reinterpret_cast<LPVOID*>(&enumerator));
+
+  if (!HandleWinAPI("Failed to create MMDeviceEnumerator", result))
+    return false;
+
+  IMMDeviceCollection* devices;
+  result = enumerator->EnumAudioEndpoints(eRender, DEVICE_STATE_ACTIVE, &devices);
+
+  if (!HandleWinAPI("Failed to get available devices", result))
+  {
+    return {};
+  }
+
+  UINT count;
+  devices->GetCount(&count);
+
+  for (u32 i = 0; i < count; i++)
+  {
+    IMMDevice* device;
+    devices->Item(i, &device);
+    if (!HandleWinAPI("Failed to get device " + std::to_string(i), result))
+      continue;
+
+    LPWSTR device_id;
+    device->GetId(&device_id);
+
+    IPropertyStore* device_properties;
+
+    result = device->OpenPropertyStore(STGM_READ, &device_properties);
+
+    if (!HandleWinAPI("Failed to initialize IPropertyStore", result))
+      continue;
+
+    PROPVARIANT device_name;
+    PropVariantInit(&device_name);
+
+    device_properties->GetValue(PKEY_Device_FriendlyName, &device_name);
+
+    if (TStrToUTF8(device_name.pwszVal) == name)
+    {
+      devices->Release();
+      enumerator->Release();
+      CoUninitialize();
+      return device;
+    }
+
+    PropVariantClear(&device_name);
+  }
+
+  devices->Release();
+  enumerator->Release();
+  CoUninitialize();
+
+  return nullptr;
+}
+
+bool WASAPIStream::Init()
+{
+  HRESULT result =
+      CoCreateInstance(__uuidof(MMDeviceEnumerator), nullptr, CLSCTX_INPROC_SERVER,
+                       __uuidof(IMMDeviceEnumerator), reinterpret_cast<LPVOID*>(&m_enumerator));
+
+  if (!HandleWinAPI("Failed to create MMDeviceEnumerator", result))
+    return false;
+
+  return true;
+}
+
+bool WASAPIStream::SetRunning(bool running)
+{
+  if (running)
+  {
+    IMMDevice* device = nullptr;
+
+    HRESULT result;
+
+    if (SConfig::GetInstance().sWASAPIDevice == "default")
+    {
+      result = m_enumerator->GetDefaultAudioEndpoint(eRender, eConsole, &device);
+    }
+    else
+    {
+      result = S_OK;
+      device = GetDeviceByName(SConfig::GetInstance().sWASAPIDevice);
+
+      if (!device)
+      {
+        ERROR_LOG(AUDIO, "Can't find device '%s', falling back to default",
+                  SConfig::GetInstance().sWASAPIDevice.c_str());
+        result = m_enumerator->GetDefaultAudioEndpoint(eRender, eConsole, &device);
+      }
+    }
+
+    if (!HandleWinAPI("Failed to obtain default endpoint", result))
+      return false;
+
+    LPWSTR device_id;
+    device->GetId(&device_id);
+
+    // Show a friendly name in the log
+    IPropertyStore* device_properties;
+
+    result = device->OpenPropertyStore(STGM_READ, &device_properties);
+
+    if (!HandleWinAPI("Failed to initialize IPropertyStore", result))
+      return false;
+
+    PROPVARIANT device_name;
+    PropVariantInit(&device_name);
+
+    device_properties->GetValue(PKEY_Device_FriendlyName, &device_name);
+
+    INFO_LOG(AUDIO, "Using audio endpoint '%s'", TStrToUTF8(device_name.pwszVal).c_str());
+
+    PropVariantClear(&device_name);
+
+    // Get IAudioDevice
+    result = device->Activate(__uuidof(IAudioClient), CLSCTX_INPROC_SERVER, nullptr,
+                              reinterpret_cast<LPVOID*>(&m_audio_client));
+
+    if (!HandleWinAPI("Failed to activate IAudioClient", result))
+    {
+      device->Release();
+      return false;
+    }
+
+    REFERENCE_TIME device_period = 0;
+
+    result = m_audio_client->GetDevicePeriod(nullptr, &device_period);
+
+    device_period += SConfig::GetInstance().iLatency * (10000 / m_format.Format.nChannels);
+    INFO_LOG(AUDIO, "Audio period set to %d", device_period);
+
+    if (!HandleWinAPI("Failed to obtain device period", result))
+    {
+      device->Release();
+      m_audio_client->Release();
+      m_audio_client = nullptr;
+      return false;
+    }
+
+    result = m_audio_client->Initialize(
+        AUDCLNT_SHAREMODE_EXCLUSIVE,
+        AUDCLNT_STREAMFLAGS_EVENTCALLBACK | AUDCLNT_STREAMFLAGS_NOPERSIST, device_period,
+        device_period, reinterpret_cast<WAVEFORMATEX*>(&m_format), nullptr);
+
+    if (result == AUDCLNT_E_UNSUPPORTED_FORMAT)
+    {
+      OSD::AddMessage("Your current audio device doesn't support 16-bit 48000 hz PCM audio. WASAPI "
+                      "exclusive mode won't work.",
+                      6000U);
+      return false;
+    }
+
+    if (result == AUDCLNT_E_BUFFER_SIZE_NOT_ALIGNED)
+    {
+      result = m_audio_client->GetBufferSize(&m_frames_in_buffer);
+      m_audio_client->Release();
+
+      if (!HandleWinAPI("Failed to get aligned buffer size", result))
+      {
+        device->Release();
+        m_audio_client->Release();
+        m_audio_client = nullptr;
+        return false;
+      }
+
+      // Get IAudioDevice
+      result = device->Activate(__uuidof(IAudioClient), CLSCTX_INPROC_SERVER, nullptr,
+                                reinterpret_cast<LPVOID*>(&m_audio_client));
+
+      if (!HandleWinAPI("Failed to reactivate IAudioClient", result))
+      {
+        device->Release();
+        return false;
+      }
+
+      device_period =
+          static_cast<REFERENCE_TIME>(
+              10000.0 * 1000 * m_frames_in_buffer / m_format.Format.nSamplesPerSec + 0.5) +
+          SConfig::GetInstance().iLatency * 10000;
+
+      result = m_audio_client->Initialize(
+          AUDCLNT_SHAREMODE_EXCLUSIVE,
+          AUDCLNT_STREAMFLAGS_EVENTCALLBACK | AUDCLNT_STREAMFLAGS_NOPERSIST, device_period,
+          device_period, reinterpret_cast<WAVEFORMATEX*>(&m_format), nullptr);
+    }
+
+    if (!HandleWinAPI("Failed to initialize IAudioClient", result))
+    {
+      device->Release();
+      m_audio_client->Release();
+      m_audio_client = nullptr;
+      return false;
+    }
+
+    result = m_audio_client->GetBufferSize(&m_frames_in_buffer);
+
+    if (!HandleWinAPI("Failed to get buffer size from IAudioClient", result))
+    {
+      device->Release();
+      m_audio_client->Release();
+      m_audio_client = nullptr;
+      return false;
+    }
+
+    result = m_audio_client->GetService(__uuidof(IAudioRenderClient),
+                                        reinterpret_cast<LPVOID*>(&m_audio_renderer));
+
+    if (!HandleWinAPI("Failed to get IAudioRenderClient from IAudioClient", result))
+    {
+      device->Release();
+      m_audio_client->Release();
+      m_audio_client = nullptr;
+      return false;
+    }
+
+    m_need_data_event = CreateEvent(nullptr, FALSE, FALSE, nullptr);
+    m_audio_client->SetEventHandle(m_need_data_event);
+
+    result = m_audio_client->Start();
+
+    if (!HandleWinAPI("Failed to get IAudioRenderClient from IAudioClient", result))
+    {
+      device->Release();
+      m_audio_renderer->Release();
+      m_audio_renderer = nullptr;
+      m_audio_client->Release();
+      m_audio_client = nullptr;
+      CloseHandle(m_need_data_event);
+      return false;
+    }
+
+    device->Release();
+
+    INFO_LOG(AUDIO, "WASAPI: Successfully initialized!");
+
+    m_running = true;
+    m_thread = std::thread([this] { SoundLoop(); });
+    m_thread.detach();
+  }
+  else
+  {
+    m_running = false;
+
+    if (m_thread.joinable())
+      m_thread.join();
+
+    while (!m_stopped)
+    {
+    }
+
+    if (m_audio_client)
+    {
+      m_audio_renderer->Release();
+      m_audio_renderer = nullptr;
+
+      m_audio_client->Release();
+      m_audio_client = nullptr;
+    }
+  }
+
+  return true;
+}
+
+void WASAPIStream::SoundLoop()
+{
+  Common::SetCurrentThreadName("WASAPI Handler");
+  BYTE* data;
+
+  if (m_audio_renderer)
+  {
+    m_audio_renderer->GetBuffer(m_frames_in_buffer, &data);
+    m_audio_renderer->ReleaseBuffer(m_frames_in_buffer, AUDCLNT_BUFFERFLAGS_SILENT);
+  }
+
+  m_stopped = false;
+
+  while (m_running)
+  {
+    if (!m_audio_renderer)
+      continue;
+
+    WaitForSingleObject(m_need_data_event, 1000);
+
+    m_audio_renderer->GetBuffer(m_frames_in_buffer, &data);
+    GetMixer()->Mix(reinterpret_cast<s16*>(data), m_frames_in_buffer);
+
+    float volume = SConfig::GetInstance().m_IsMuted ? 0 : SConfig::GetInstance().m_Volume / 100.;
+
+    for (u32 i = 0; i < m_frames_in_buffer * 2; i++)
+      reinterpret_cast<s16*>(data)[i] = static_cast<s16>(reinterpret_cast<s16*>(data)[i] * volume);
+
+    m_audio_renderer->ReleaseBuffer(m_frames_in_buffer, 0);
+  }
+
+  m_stopped = true;
+}
+
+#endif  // _WIN32

Source/Core/AudioCommon/WASAPIStream.h

@@ -0,0 +1,52 @@
+// Copyright 2018 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#ifdef _WIN32
+// clang-format off
+#include <Windows.h>
+#include <mmreg.h>
+// clang-format on
+#endif
+
+#include <atomic>
+#include <string>
+#include <thread>
+#include <vector>
+
+#include "AudioCommon/SoundStream.h"
+
+struct IAudioClient;
+struct IAudioRenderClient;
+struct IMMDevice;
+struct IMMDeviceEnumerator;
+
+class WASAPIStream final : public SoundStream
+{
+#ifdef _WIN32
+public:
+  explicit WASAPIStream();
+  ~WASAPIStream();
+  bool Init() override;
+  bool SetRunning(bool running) override;
+  void SoundLoop() override;
+
+  static bool isValid();
+  static std::vector<std::string> GetAvailableDevices();
+  static IMMDevice* GetDeviceByName(std::string name);
+
+private:
+  u32 m_frames_in_buffer = 0;
+  std::atomic<bool> m_running = false;
+  std::atomic<bool> m_stopped = false;
+  std::thread m_thread;
+
+  IAudioClient* m_audio_client = nullptr;
+  IAudioRenderClient* m_audio_renderer = nullptr;
+  IMMDeviceEnumerator* m_enumerator = nullptr;
+  HANDLE m_need_data_event = nullptr;
+  WAVEFORMATEXTENSIBLE m_format;
+#endif  // _WIN32
+};

Source/Core/Core/ConfigManager.cpp

@@ -292,6 +292,10 @@ void SConfig::SaveDSPSettings(IniFile& ini)
   dsp->Set("Backend", sBackend);
   dsp->Set("Volume", m_Volume);
   dsp->Set("CaptureLog", m_DSPCaptureLog);
+
+#ifdef _WIN32
+  dsp->Set("WASAPIDevice", sWASAPIDevice);
+#endif
 }
 
 void SConfig::SaveInputSettings(IniFile& ini)
@@ -589,6 +593,10 @@ void SConfig::LoadDSPSettings(IniFile& ini)
   dsp->Get("Volume", &m_Volume, 100);
   dsp->Get("CaptureLog", &m_DSPCaptureLog, false);
 
+#ifdef _WIN32
+  dsp->Get("WASAPIDevice", &sWASAPIDevice, "default");
+#endif
+
   m_IsMuted = false;
 }
 

Source/Core/Core/ConfigManager.h

@@ -22,14 +22,14 @@ enum class Language;
 enum class Region;
 struct Partition;
 class Volume;
-}
+}  // namespace DiscIO
 namespace IOS
 {
 namespace ES
 {
 class TMDReader;
 }
-}
+}  // namespace IOS
 
 // DSP Backend Types
 #define BACKEND_NULLSOUND _trans("No Audio Output")
@@ -39,6 +39,7 @@ class TMDReader;
 #define BACKEND_PULSEAUDIO "Pulse"
 #define BACKEND_XAUDIO2 "XAudio2"
 #define BACKEND_OPENSLES "OpenSLES"
+#define BACKEND_WASAPI "WASAPI (Exclusive Mode)"
 
 enum GPUDeterminismMode
 {
@@ -298,6 +299,11 @@ struct SConfig
   int m_Volume;
   std::string sBackend;
 
+#ifdef _WIN32
+  // WSAPI settings
+  std::string sWASAPIDevice;
+#endif
+
   // Input settings
   bool m_BackgroundInput;
   bool m_AdapterRumble[4];

Source/Core/DolphinQt2/Settings/AudioPane.cpp

@@ -17,6 +17,7 @@
 #include <QVBoxLayout>
 
 #include "AudioCommon/AudioCommon.h"
+#include "AudioCommon/WASAPIStream.h"
 #include "Core/ConfigManager.h"
 #include "Core/Core.h"
 #include "DolphinQt2/Config/SettingsWindow.h"
@@ -88,6 +89,14 @@ void AudioPane::CreateWidgets()
   backend_layout->addRow(m_backend_label, m_backend_combo);
   if (m_latency_control_supported)
     backend_layout->addRow(m_latency_label, m_latency_spin);
+
+#ifdef _WIN32
+  m_wasapi_device_label = new QLabel(tr("Device:"));
+  m_wasapi_device_combo = new QComboBox;
+
+  backend_layout->addRow(m_wasapi_device_label, m_wasapi_device_combo);
+#endif
+
   backend_layout->addRow(m_dolby_pro_logic);
 
   auto* stretching_box = new QGroupBox(tr("Audio Stretching Settings"));
@@ -140,6 +149,12 @@ void AudioPane::ConnectWidgets()
   connect(m_dsp_hle, &QRadioButton::toggled, this, &AudioPane::SaveSettings);
   connect(m_dsp_lle, &QRadioButton::toggled, this, &AudioPane::SaveSettings);
   connect(m_dsp_interpreter, &QRadioButton::toggled, this, &AudioPane::SaveSettings);
+
+#ifdef _WIN32
+  connect(m_wasapi_device_combo,
+          static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged), this,
+          &AudioPane::SaveSettings);
+#endif
 }
 
 void AudioPane::LoadSettings()
@@ -183,6 +198,18 @@ void AudioPane::LoadSettings()
   m_stretching_buffer_slider->setValue(SConfig::GetInstance().m_audio_stretch_max_latency);
   m_stretching_buffer_slider->setEnabled(m_stretching_enable->isChecked());
   m_stretching_buffer_indicator->setText(tr("%1 ms").arg(m_stretching_buffer_slider->value()));
+
+#ifdef _WIN32
+  if (SConfig::GetInstance().sWASAPIDevice == "default")
+  {
+    m_wasapi_device_combo->setCurrentIndex(0);
+  }
+  else
+  {
+    m_wasapi_device_combo->setCurrentText(
+        QString::fromStdString(SConfig::GetInstance().sWASAPIDevice));
+  }
+#endif
 }
 
 void AudioPane::SaveSettings()
@@ -227,6 +254,15 @@ void AudioPane::SaveSettings()
   m_stretching_buffer_indicator->setText(
       tr("%1 ms").arg(SConfig::GetInstance().m_audio_stretch_max_latency));
 
+#ifdef _WIN32
+  std::string device = "default";
+
+  if (m_wasapi_device_combo->currentIndex() != 0)
+    device = m_wasapi_device_combo->currentText().toStdString();
+
+  SConfig::GetInstance().sWASAPIDevice = device;
+#endif
+
   AudioCommon::UpdateSoundStream();
 }
 
@@ -240,6 +276,22 @@ void AudioPane::OnBackendChanged()
     m_latency_label->setEnabled(AudioCommon::SupportsLatencyControl(backend));
     m_latency_spin->setEnabled(AudioCommon::SupportsLatencyControl(backend));
   }
+
+#ifdef _WIN32
+  bool is_wasapi = backend == BACKEND_WASAPI;
+  m_wasapi_device_label->setHidden(!is_wasapi);
+  m_wasapi_device_combo->setHidden(!is_wasapi);
+
+  if (is_wasapi)
+  {
+    m_wasapi_device_combo->clear();
+    m_wasapi_device_combo->addItem(tr("Default Device"));
+
+    for (const auto device : WASAPIStream::GetAvailableDevices())
+      m_wasapi_device_combo->addItem(QString::fromStdString(device));
+  }
+#endif
+
   m_volume_slider->setEnabled(AudioCommon::SupportsVolumeChanges(backend));
   m_volume_indicator->setEnabled(AudioCommon::SupportsVolumeChanges(backend));
 }
@@ -257,6 +309,10 @@ void AudioPane::OnEmulationStateChanged(bool running)
     m_latency_label->setEnabled(!running);
     m_latency_spin->setEnabled(!running);
   }
+
+#ifdef _WIN32
+  m_wasapi_device_combo->setEnabled(!running);
+#endif
 }
 
 void AudioPane::OnVolumeChanged(int volume)

Source/Core/DolphinQt2/Settings/AudioPane.h

@@ -52,6 +52,10 @@ private:
   QCheckBox* m_dolby_pro_logic;
   QLabel* m_latency_label;
   QSpinBox* m_latency_spin;
+#ifdef _WIN32
+  QLabel* m_wasapi_device_label;
+  QComboBox* m_wasapi_device_combo;
+#endif
 
   // Audio Stretching
   QCheckBox* m_stretching_enable;