FrontendCommon: Add XAudio2 audio backend

src/core/settings.cpp

@@ -828,24 +828,33 @@ float Settings::GetDisplayAspectRatioValue() const
   }
 }
 
-static std::array<const char*, 3> s_audio_backend_names = {{
-  "Null",
-  "Cubeb",
-#ifndef ANDROID
-  "SDL",
-#else
-  "OpenSLES",
+static const auto s_audio_backend_names = make_array("Null", "Cubeb"
+#ifdef _WIN32
+                                                     ,
+                                                     "XAudio2"
 #endif
-}};
-static std::array<const char*, 3> s_audio_backend_display_names = {{
-  TRANSLATABLE("AudioBackend", "Null (No Output)"),
-  TRANSLATABLE("AudioBackend", "Cubeb"),
 #ifndef ANDROID
-  TRANSLATABLE("AudioBackend", "SDL"),
+                                                     ,
+                                                     "SDL"
 #else
-  TRANSLATABLE("AudioBackend", "OpenSL ES"),
+                                                     ,
+                                                     "OpenSLES"
 #endif
-}};
+);
+static const auto s_audio_backend_display_names =
+  make_array(TRANSLATABLE("AudioBackend", "Null (No Output)"), TRANSLATABLE("AudioBackend", "Cubeb")
+#ifdef _WIN32
+                                                                 ,
+             TRANSLATABLE("AudioBackend", "XAudio2")
+#endif
+#ifndef ANDROID
+               ,
+             TRANSLATABLE("AudioBackend", "SDL")
+#else
+                                                                 ,
+             TRANSLATABLE("AudioBackend", "OpenSL ES")
+#endif
+  );
 
 std::optional<AudioBackend> Settings::ParseAudioBackend(const char* str)
 {

src/core/types.h

@@ -108,6 +108,9 @@ enum class AudioBackend : u8
 {
   Null,
   Cubeb,
+#ifdef _WIN32
+  XAudio2,
+#endif
 #ifndef ANDROID
   SDL,
 #else

src/frontend-common/CMakeLists.txt

@@ -55,6 +55,8 @@ if(WIN32)
     dinput_controller_interface.h
     imgui_impl_dx11.cpp
     imgui_impl_dx11.h
+    xaudio2_audio_stream.cpp
+    xaudio2_audio_stream.h
     xinput_controller_interface.cpp
     xinput_controller_interface.h
   )

src/frontend-common/common_host_interface.cpp

@@ -58,6 +58,14 @@
 #include <mmsystem.h>
 #endif
 
+namespace FrontendCommon {
+
+#ifdef _WIN32
+std::unique_ptr<AudioStream> CreateXAudio2AudioStream();
+#endif
+
+} // namespace FrontendCommon
+
 Log_SetChannel(CommonHostInterface);
 
 static std::string s_settings_filename;
@@ -628,6 +636,11 @@ std::unique_ptr<AudioStream> CommonHostInterface::CreateAudioStream(AudioBackend
     case AudioBackend::Cubeb:
       return CubebAudioStream::Create();
 
+#ifdef _WIN32
+    case AudioBackend::XAudio2:
+      return FrontendCommon::CreateXAudio2AudioStream();
+#endif
+
 #ifdef WITH_SDL2
     case AudioBackend::SDL:
       return SDLAudioStream::Create();
@@ -2049,7 +2062,7 @@ void CommonHostInterface::RegisterGeneralHotkeys()
                      }
                    }
                  });
-#endif  // !defined(__ANDROID__) && defined(WITH_CHEEVOS)
+#endif // !defined(__ANDROID__) && defined(WITH_CHEEVOS)
 }
 
 void CommonHostInterface::RegisterSystemHotkeys()

src/frontend-common/frontend-common.vcxproj

@@ -114,6 +114,7 @@
     <ClCompile Include="sdl_controller_interface.cpp" />
     <ClCompile Include="sdl_initializer.cpp" />
     <ClCompile Include="vulkan_host_display.cpp" />
+    <ClCompile Include="xaudio2_audio_stream.cpp" />
     <ClCompile Include="xinput_controller_interface.cpp" />
   </ItemGroup>
   <ItemGroup>
@@ -148,6 +149,7 @@
     <ClInclude Include="sdl_controller_interface.h" />
     <ClInclude Include="sdl_initializer.h" />
     <ClInclude Include="vulkan_host_display.h" />
+    <ClInclude Include="xaudio2_audio_stream.h" />
     <ClInclude Include="xinput_controller_interface.h" />
   </ItemGroup>
   <ItemGroup>

src/frontend-common/frontend-common.vcxproj.filters

@@ -33,6 +33,7 @@
     <ClCompile Include="input_overlay_ui.cpp" />
     <ClCompile Include="game_database.cpp" />
     <ClCompile Include="inhibit_screensaver.cpp" />
+    <ClCompile Include="xaudio2_audio_stream.cpp" />
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="icon.h" />
@@ -67,6 +68,7 @@
     <ClInclude Include="input_overlay_ui.h" />
     <ClInclude Include="game_database.h" />
     <ClInclude Include="inhibit_screensaver.h" />
+    <ClInclude Include="xaudio2_audio_stream.h" />
   </ItemGroup>
   <ItemGroup>
     <None Include="font_roboto_regular.inl" />

src/frontend-common/xaudio2_audio_stream.cpp

@@ -0,0 +1,209 @@
+#include "xaudio2_audio_stream.h"
+#include "common/assert.h"
+#include "common/log.h"
+#include <VersionHelpers.h>
+#include <xaudio2.h>
+Log_SetChannel(XAudio2AudioStream);
+
+#if !WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
+#pragma comment(lib, "xaudio2.lib")
+#endif
+
+XAudio2AudioStream::XAudio2AudioStream() = default;
+
+XAudio2AudioStream::~XAudio2AudioStream()
+{
+  if (IsOpen())
+    XAudio2AudioStream::CloseDevice();
+
+#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
+  if (m_xaudio2_library)
+    FreeLibrary(m_xaudio2_library);
+
+  if (m_com_initialized_by_us)
+    CoUninitialize();
+#endif
+}
+
+bool XAudio2AudioStream::Initialize()
+{
+#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
+  m_xaudio2_library = LoadLibraryW(XAUDIO2_DLL_W);
+  if (!m_xaudio2_library)
+  {
+    Log_ErrorPrintf("Failed to load '%s', make sure you're using Windows 10", XAUDIO2_DLL_A);
+    return false;
+  }
+#endif
+
+  return true;
+}
+
+bool XAudio2AudioStream::OpenDevice()
+{
+  DebugAssert(!IsOpen());
+
+  HRESULT hr;
+#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
+  using PFNXAUDIO2CREATE =
+    HRESULT(STDAPICALLTYPE*)(IXAudio2 * *ppXAudio2, UINT32 Flags, XAUDIO2_PROCESSOR XAudio2Processor);
+  PFNXAUDIO2CREATE xaudio2_create =
+    reinterpret_cast<PFNXAUDIO2CREATE>(GetProcAddress(m_xaudio2_library, "XAudio2Create"));
+  if (!xaudio2_create)
+    return false;
+
+  hr = CoInitializeEx(nullptr, COINIT_MULTITHREADED);
+  m_com_initialized_by_us = SUCCEEDED(hr);
+  if (FAILED(hr) && hr != RPC_E_CHANGED_MODE && hr != S_FALSE)
+  {
+    Log_ErrorPrintf("Failed to initialize COM");
+    return false;
+  }
+
+  hr = xaudio2_create(m_xaudio.ReleaseAndGetAddressOf(), 0, XAUDIO2_DEFAULT_PROCESSOR);
+#else
+  hr = XAudio2Create(m_xaudio.ReleaseAndGetAddressOf(), 0, XAUDIO2_DEFAULT_PROCESSOR);
+#endif
+  if (FAILED(hr))
+  {
+    Log_ErrorPrintf("XAudio2Create() failed: %08X", hr);
+    return false;
+  }
+
+  hr = m_xaudio->CreateMasteringVoice(&m_mastering_voice, m_channels, m_output_sample_rate, 0, nullptr);
+  if (FAILED(hr))
+  {
+    Log_ErrorPrintf("CreateMasteringVoice() failed: %08X", hr);
+    return false;
+  }
+
+  WAVEFORMATEX wf = {};
+  wf.cbSize = sizeof(wf);
+  wf.nAvgBytesPerSec = m_output_sample_rate * m_channels * sizeof(s16);
+  wf.nBlockAlign = static_cast<WORD>(sizeof(s16) * m_channels);
+  wf.nChannels = static_cast<WORD>(m_channels);
+  wf.nSamplesPerSec = m_output_sample_rate;
+  wf.wBitsPerSample = sizeof(s16) * 8;
+  wf.wFormatTag = WAVE_FORMAT_PCM;
+  hr = m_xaudio->CreateSourceVoice(&m_source_voice, &wf, 0, 1.0f, this);
+  if (FAILED(hr))
+  {
+    Log_ErrorPrintf("CreateMasteringVoice() failed: %08X", hr);
+    return false;
+  }
+
+  hr = m_source_voice->SetFrequencyRatio(1.0f);
+  if (FAILED(hr))
+  {
+    Log_ErrorPrintf("SetFrequencyRatio() failed: %08X", hr);
+    return false;
+  }
+
+  for (u32 i = 0; i < NUM_BUFFERS; i++)
+    m_buffers[i] = std::make_unique<SampleType[]>(m_buffer_size * m_channels);
+
+  return true;
+}
+
+void XAudio2AudioStream::PauseDevice(bool paused)
+{
+  if (m_paused == paused)
+    return;
+
+  if (paused)
+  {
+    HRESULT hr = m_source_voice->Stop(0, 0);
+    if (FAILED(hr))
+      Log_ErrorPrintf("Stop() failed: %08X", hr);
+  }
+  else
+  {
+    HRESULT hr = m_source_voice->Start(0, 0);
+    if (FAILED(hr))
+      Log_ErrorPrintf("Start() failed: %08X", hr);
+  }
+
+  m_paused = paused;
+}
+
+void XAudio2AudioStream::CloseDevice()
+{
+  HRESULT hr;
+  if (!m_paused)
+  {
+    hr = m_source_voice->Stop(0, 0);
+    if (FAILED(hr))
+      Log_ErrorPrintf("Stop() failed: %08X", hr);
+  }
+
+  m_source_voice = nullptr;
+  m_mastering_voice = nullptr;
+  m_xaudio.Reset();
+  m_buffers = {};
+  m_current_buffer = 0;
+  m_paused = true;
+}
+
+void XAudio2AudioStream::FramesAvailable()
+{
+  if (!m_buffer_enqueued)
+  {
+    m_buffer_enqueued = true;
+    EnqueueBuffer();
+  }
+}
+
+void XAudio2AudioStream::EnqueueBuffer()
+{
+  SampleType* samples = m_buffers[m_current_buffer].get();
+  ReadFrames(samples, m_buffer_size, false);
+
+  const XAUDIO2_BUFFER buf = {
+    static_cast<UINT32>(0),                                        // flags
+    static_cast<UINT32>(sizeof(s16) * m_channels * m_buffer_size), // bytes
+    reinterpret_cast<const BYTE*>(samples)                         // data
+  };
+
+  HRESULT hr = m_source_voice->SubmitSourceBuffer(&buf, nullptr);
+  if (FAILED(hr))
+    Log_ErrorPrintf("SubmitSourceBuffer() failed: %08X", hr);
+
+  m_current_buffer = (m_current_buffer + 1) % NUM_BUFFERS;
+}
+
+void XAudio2AudioStream::SetOutputVolume(u32 volume)
+{
+  HRESULT hr = m_source_voice->SetVolume(static_cast<float>(m_output_volume) / 100.0f);
+  if (FAILED(hr))
+    Log_ErrorPrintf("SetVolume() failed: %08X", hr);
+}
+
+void __stdcall XAudio2AudioStream::OnVoiceProcessingPassStart(UINT32 BytesRequired) {}
+
+void __stdcall XAudio2AudioStream::OnVoiceProcessingPassEnd(void) {}
+
+void __stdcall XAudio2AudioStream::OnStreamEnd(void) {}
+
+void __stdcall XAudio2AudioStream::OnBufferStart(void* pBufferContext) {}
+
+void __stdcall XAudio2AudioStream::OnBufferEnd(void* pBufferContext)
+{
+  EnqueueBuffer();
+}
+
+void __stdcall XAudio2AudioStream::OnLoopEnd(void* pBufferContext) {}
+
+void __stdcall XAudio2AudioStream::OnVoiceError(void* pBufferContext, HRESULT Error) {}
+
+namespace FrontendCommon {
+
+std::unique_ptr<AudioStream> CreateXAudio2AudioStream()
+{
+  std::unique_ptr<XAudio2AudioStream> stream = std::make_unique<XAudio2AudioStream>();
+  if (!stream->Initialize())
+    return {};
+
+  return stream;
+}
+
+} // namespace FrontendCommon

src/frontend-common/xaudio2_audio_stream.h

@@ -0,0 +1,61 @@
+#pragma once
+#include "common/audio_stream.h"
+#include "common/windows_headers.h"
+#include <array>
+#include <cstdint>
+#include <memory>
+#include <wrl/client.h>
+
+// We need to use the Windows 10 headers otherwise this won't compile.
+#undef _WIN32_WINNT
+#define _WIN32_WINNT _WIN32_WINNT_WIN10
+#include <xaudio2.h>
+
+class XAudio2AudioStream final : public AudioStream, private IXAudio2VoiceCallback
+{
+public:
+  XAudio2AudioStream();
+  ~XAudio2AudioStream();
+
+  bool Initialize();
+
+  void SetOutputVolume(u32 volume) override;
+
+protected:
+  enum : u32
+  {
+    NUM_BUFFERS = 2
+  };
+
+  ALWAYS_INLINE bool IsOpen() const { return static_cast<bool>(m_xaudio); }
+
+  bool OpenDevice() override;
+  void PauseDevice(bool paused) override;
+  void CloseDevice() override;
+  void FramesAvailable() override;
+
+  // Inherited via IXAudio2VoiceCallback
+  virtual void __stdcall OnVoiceProcessingPassStart(UINT32 BytesRequired) override;
+  virtual void __stdcall OnVoiceProcessingPassEnd(void) override;
+  virtual void __stdcall OnStreamEnd(void) override;
+  virtual void __stdcall OnBufferStart(void* pBufferContext) override;
+  virtual void __stdcall OnBufferEnd(void* pBufferContext) override;
+  virtual void __stdcall OnLoopEnd(void* pBufferContext) override;
+  virtual void __stdcall OnVoiceError(void* pBufferContext, HRESULT Error) override;
+
+  void EnqueueBuffer();
+
+  Microsoft::WRL::ComPtr<IXAudio2> m_xaudio;
+  IXAudio2MasteringVoice* m_mastering_voice = nullptr;
+  IXAudio2SourceVoice* m_source_voice = nullptr;
+
+  std::array<std::unique_ptr<SampleType[]>, NUM_BUFFERS> m_buffers;
+  u32 m_current_buffer = 0;
+  bool m_buffer_enqueued = false;
+  bool m_paused = true;
+
+#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
+  HMODULE m_xaudio2_library = {};
+  bool m_com_initialized_by_us = false;
+#endif
+};