[APU] Support XAudio 2.7

4 files changed, 470 insertions, 87 deletions

diff --git a/src/xenia/apu/xaudio2/xaudio2_api.h b/src/xenia/apu/xaudio2/xaudio2_api.h
new file mode 100644
index 000000000..00c42349d
--- /dev/null
+++ b/src/xenia/apu/xaudio2/xaudio2_api.h
@@ -0,0 +1,315 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2019 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#ifndef XENIA_APU_XAUDIO2_XAUDIO2_API_H_
+#define XENIA_APU_XAUDIO2_XAUDIO2_API_H_
+
+#include <Audioclient.h>
+
+#include "xenia/base/platform_win.h"
+
+namespace xe {
+namespace apu {
+namespace xaudio2 {
+namespace api {
+
+// Parts of XAudio2.h needed for Xenia. The header in the Windows SDK (for 2.8+)
+// or the DirectX SDK (for 2.7 and below) is for a single version that is chosen
+// for the target OS version at compile time, and cannot be useful for different
+// DLL versions.
+//
+// XAudio 2.8 is also not available on Windows 7, but including the 2.7 header
+// is complicated because it has the same name and include guard as the 2.8 one,
+// and also 2.7 is outdated - support already dropped in Microsoft Store apps,
+// for instance.
+//
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+
+class __declspec(uuid("5a508685-a254-4fba-9b82-9a24b00306af")) XAudio2_7;
+interface __declspec(uuid("8bcf1f58-9fe7-4583-8ac6-e2adc465c8bb")) IXAudio2_7;
+interface __declspec(uuid("60d8dac8-5aa1-4e8e-b597-2f5e2883d484")) IXAudio2_8;
+
+#pragma pack(push, 1)
+
+static constexpr UINT32 XE_XAUDIO2_MAX_QUEUED_BUFFERS = 64;
+static constexpr float XE_XAUDIO2_MAX_FREQ_RATIO = 1024.0f;
+static constexpr float XE_XAUDIO2_DEFAULT_FREQ_RATIO = 2.0f;
+
+static constexpr UINT32 XE_XAUDIO2_COMMIT_NOW = 0;
+static constexpr UINT32 XE_XAUDIO2_NO_LOOP_REGION = 0;
+static constexpr UINT32 XE_XAUDIO2_DEFAULT_CHANNELS = 0;
+static constexpr UINT32 XE_XAUDIO2_DEFAULT_SAMPLERATE = 0;
+
+// 2.8+ only.
+static constexpr UINT32 XE_XAUDIO2_VOICE_NOSAMPLESPLAYED = 0x0100;
+
+interface IXAudio2_7;
+interface IXAudio2_8;
+interface IXAudio2Voice;
+interface IXAudio2_7SourceVoice;
+interface IXAudio2_8SourceVoice;
+interface IXAudio2SubmixVoice;
+interface IXAudio2_7MasteringVoice;
+interface IXAudio2_8MasteringVoice;
+interface IXAudio2EngineCallback;
+interface IXAudio2VoiceCallback;
+
+typedef UINT32 XAUDIO2_PROCESSOR;
+static constexpr XAUDIO2_PROCESSOR XE_XAUDIO2_ANY_PROCESSOR = 0xFFFFFFFF;
+static constexpr XAUDIO2_PROCESSOR XE_XAUDIO2_7_DEFAULT_PROCESSOR =
+    XE_XAUDIO2_ANY_PROCESSOR;
+static constexpr XAUDIO2_PROCESSOR XE_XAUDIO2_8_DEFAULT_PROCESSOR = 0x00000001;
+
+// 2.7 only.
+struct XAUDIO2_DEVICE_DETAILS;
+
+struct XAUDIO2_VOICE_DETAILS;
+struct XAUDIO2_VOICE_SENDS;
+struct XAUDIO2_EFFECT_CHAIN;
+struct XAUDIO2_FILTER_PARAMETERS;
+
+struct XAUDIO2_BUFFER {
+  UINT32 Flags;
+  UINT32 AudioBytes;
+  const BYTE* pAudioData;
+  UINT32 PlayBegin;
+  UINT32 PlayLength;
+  UINT32 LoopBegin;
+  UINT32 LoopLength;
+  UINT32 LoopCount;
+  void* pContext;
+};
+
+struct XAUDIO2_BUFFER_WMA;
+
+struct XAUDIO2_VOICE_STATE {
+  void* pCurrentBufferContext;
+  UINT32 BuffersQueued;
+  UINT64 SamplesPlayed;
+};
+
+struct XAUDIO2_PERFORMANCE_DATA;
+
+struct XAUDIO2_DEBUG_CONFIGURATION {
+  UINT32 TraceMask;
+  UINT32 BreakMask;
+  BOOL LogThreadID;
+  BOOL LogFileline;
+  BOOL LogFunctionName;
+  BOOL LogTiming;
+};
+
+static constexpr UINT32 XE_XAUDIO2_LOG_ERRORS = 0x0001;
+static constexpr UINT32 XE_XAUDIO2_LOG_WARNINGS = 0x0002;
+
+// clang-format off
+
+// IXAudio2 2.7.
+DECLARE_INTERFACE_(IXAudio2_7, IUnknown) {
+  STDMETHOD(QueryInterface)(REFIID riid, void** ppvInterface) = 0;
+  STDMETHOD_(ULONG, AddRef)() = 0;
+  STDMETHOD_(ULONG, Release)() = 0;
+  // 2.7 only.
+  STDMETHOD(GetDeviceCount)(UINT32* pCount) = 0;
+  // 2.7 only.
+  STDMETHOD(GetDeviceDetails)(UINT32 Index,
+                              XAUDIO2_DEVICE_DETAILS* pDeviceDetails) = 0;
+  // 2.7 only.
+  STDMETHOD(Initialize)(
+      UINT32 Flags = 0,
+      XAUDIO2_PROCESSOR XAudio2Processor = XE_XAUDIO2_7_DEFAULT_PROCESSOR) = 0;
+  STDMETHOD(RegisterForCallbacks)(IXAudio2EngineCallback* pCallback) = 0;
+  STDMETHOD_(void, UnregisterForCallbacks)(
+      IXAudio2EngineCallback* pCallback) = 0;
+  STDMETHOD(CreateSourceVoice)(
+      IXAudio2_7SourceVoice** ppSourceVoice, const WAVEFORMATEX* pSourceFormat,
+      UINT32 Flags = 0, float MaxFrequencyRatio = XE_XAUDIO2_DEFAULT_FREQ_RATIO,
+      IXAudio2VoiceCallback* pCallback = nullptr,
+      const XAUDIO2_VOICE_SENDS* pSendList = nullptr,
+      const XAUDIO2_EFFECT_CHAIN* pEffectChain = nullptr) = 0;
+  STDMETHOD(CreateSubmixVoice)(
+      IXAudio2SubmixVoice** ppSubmixVoice, UINT32 InputChannels,
+      UINT32 InputSampleRate, UINT32 Flags = 0, UINT32 ProcessingStage = 0,
+      const XAUDIO2_VOICE_SENDS* pSendList = nullptr,
+      const XAUDIO2_EFFECT_CHAIN* pEffectChain = nullptr) = 0;
+  // 2.7: Device index instead of device ID, no stream category.
+  STDMETHOD(CreateMasteringVoice)(
+      IXAudio2_7MasteringVoice** ppMasteringVoice,
+      UINT32 InputChannels = XE_XAUDIO2_DEFAULT_CHANNELS,
+      UINT32 InputSampleRate = XE_XAUDIO2_DEFAULT_SAMPLERATE, UINT32 Flags = 0,
+      UINT32 DeviceIndex = 0,
+      const XAUDIO2_EFFECT_CHAIN* pEffectChain = nullptr) = 0;
+  STDMETHOD(StartEngine)() = 0;
+  STDMETHOD_(void, StopEngine)() = 0;
+  STDMETHOD(CommitChanges)(UINT32 OperationSet) = 0;
+  STDMETHOD_(void, GetPerformanceData)(XAUDIO2_PERFORMANCE_DATA* pPerfData) = 0;
+  STDMETHOD_(void, SetDebugConfiguration)(
+      const XAUDIO2_DEBUG_CONFIGURATION* pDebugConfiguration,
+      void* pReserved = nullptr) = 0;
+};
+
+// IXAudio2 2.8.
+DECLARE_INTERFACE_(IXAudio2_8, IUnknown) {
+  STDMETHOD(QueryInterface)(REFIID riid, void** ppvInterface) = 0;
+  STDMETHOD_(ULONG, AddRef)() = 0;
+  STDMETHOD_(ULONG, Release)() = 0;
+  // 2.8: No GetDeviceCount, GetDeviceDetails and Initialize.
+  STDMETHOD(RegisterForCallbacks)(IXAudio2EngineCallback* pCallback) = 0;
+  STDMETHOD_(void, UnregisterForCallbacks)(
+      IXAudio2EngineCallback* pCallback) = 0;
+  STDMETHOD(CreateSourceVoice)(
+      IXAudio2_8SourceVoice** ppSourceVoice, const WAVEFORMATEX* pSourceFormat,
+      UINT32 Flags = 0, float MaxFrequencyRatio = XE_XAUDIO2_DEFAULT_FREQ_RATIO,
+      IXAudio2VoiceCallback* pCallback = nullptr,
+      const XAUDIO2_VOICE_SENDS* pSendList = nullptr,
+      const XAUDIO2_EFFECT_CHAIN* pEffectChain = nullptr) = 0;
+  STDMETHOD(CreateSubmixVoice)(
+      IXAudio2SubmixVoice** ppSubmixVoice, UINT32 InputChannels,
+      UINT32 InputSampleRate, UINT32 Flags = 0, UINT32 ProcessingStage = 0,
+      const XAUDIO2_VOICE_SENDS* pSendList = nullptr,
+      const XAUDIO2_EFFECT_CHAIN* pEffectChain = nullptr) = 0;
+  // 2.8: Device ID instead of device index, added stream category.
+  STDMETHOD(CreateMasteringVoice)(
+      IXAudio2_8MasteringVoice** ppMasteringVoice,
+      UINT32 InputChannels = XE_XAUDIO2_DEFAULT_CHANNELS,
+      UINT32 InputSampleRate = XE_XAUDIO2_DEFAULT_SAMPLERATE, UINT32 Flags = 0,
+      LPCWSTR szDeviceId = nullptr,
+      const XAUDIO2_EFFECT_CHAIN* pEffectChain = nullptr,
+      AUDIO_STREAM_CATEGORY StreamCategory = AudioCategory_GameEffects) = 0;
+  STDMETHOD(StartEngine)() = 0;
+  STDMETHOD_(void, StopEngine)() = 0;
+  STDMETHOD(CommitChanges)(UINT32 OperationSet) = 0;
+  STDMETHOD_(void, GetPerformanceData)(XAUDIO2_PERFORMANCE_DATA* pPerfData) = 0;
+  STDMETHOD_(void, SetDebugConfiguration)(
+      const XAUDIO2_DEBUG_CONFIGURATION* pDebugConfiguration,
+      void* pReserved = nullptr) = 0;
+};
+
+DECLARE_INTERFACE(IXAudio2Voice) {
+#define XE_APU_XAUDIO2_API_DECLARE_IXAUDIO2VOICE_METHODS \
+  STDMETHOD_(void, GetVoiceDetails)(XAUDIO2_VOICE_DETAILS* pVoiceDetails) = 0; \
+  STDMETHOD(SetOutputVoices)(const XAUDIO2_VOICE_SENDS* pSendList) = 0; \
+  STDMETHOD(SetEffectChain)(const XAUDIO2_EFFECT_CHAIN* pEffectChain) = 0; \
+  STDMETHOD(EnableEffect)(UINT32 EffectIndex, \
+                          UINT32 OperationSet = XE_XAUDIO2_COMMIT_NOW) = 0; \
+  STDMETHOD(DisableEffect)(UINT32 EffectIndex, \
+                           UINT32 OperationSet = XE_XAUDIO2_COMMIT_NOW) = 0; \
+  STDMETHOD_(void, GetEffectState)(UINT32 EffectIndex, BOOL* pEnabled) = 0; \
+  STDMETHOD(SetEffectParameters)( \
+      UINT32 EffectIndex, const void* pParameters, UINT32 ParametersByteSize, \
+      UINT32 OperationSet = XE_XAUDIO2_COMMIT_NOW) = 0; \
+  STDMETHOD(GetEffectParameters)(UINT32 EffectIndex, void* pParameters, \
+                                 UINT32 ParametersByteSize) = 0; \
+  STDMETHOD(SetFilterParameters)( \
+      const XAUDIO2_FILTER_PARAMETERS* pParameters, \
+      UINT32 OperationSet = XE_XAUDIO2_COMMIT_NOW) = 0; \
+  STDMETHOD_(void, GetFilterParameters)( \
+      XAUDIO2_FILTER_PARAMETERS* pParameters) = 0; \
+  STDMETHOD(SetOutputFilterParameters)( \
+      IXAudio2Voice* pDestinationVoice, \
+      const XAUDIO2_FILTER_PARAMETERS* pParameters, \
+      UINT32 OperationSet = XE_XAUDIO2_COMMIT_NOW) = 0; \
+  STDMETHOD_(void, GetOutputFilterParameters)( \
+      IXAudio2Voice* pDestinationVoice, \
+      XAUDIO2_FILTER_PARAMETERS* pParameters) = 0; \
+  STDMETHOD(SetVolume)(float Volume, \
+                       UINT32 OperationSet = XE_XAUDIO2_COMMIT_NOW) = 0; \
+  STDMETHOD_(void, GetVolume)(float* pVolume) = 0; \
+  STDMETHOD(SetChannelVolumes)( \
+      UINT32 Channels, const float* pVolumes, \
+      UINT32 OperationSet = XE_XAUDIO2_COMMIT_NOW) = 0; \
+  STDMETHOD_(void, GetChannelVolumes)(UINT32 Channels, float* pVolumes) = 0; \
+  STDMETHOD(SetOutputMatrix)(IXAudio2Voice* pDestinationVoice, \
+                             UINT32 SourceChannels, \
+                             UINT32 DestinationChannels, \
+                             const float* pLevelMatrix, \
+                             UINT32 OperationSet = XE_XAUDIO2_COMMIT_NOW) = 0; \
+  STDMETHOD_(void, GetOutputMatrix)(IXAudio2Voice* pDestinationVoice, \
+                                    UINT32 SourceChannels, \
+                                    UINT32 DestinationChannels, \
+                                    float* pLevelMatrix) = 0; \
+  STDMETHOD_(void, DestroyVoice)() = 0;
+  XE_APU_XAUDIO2_API_DECLARE_IXAUDIO2VOICE_METHODS
+};
+
+// IXAudio2SourceVoice 2.7.
+DECLARE_INTERFACE_(IXAudio2_7SourceVoice, IXAudio2Voice) {
+  XE_APU_XAUDIO2_API_DECLARE_IXAUDIO2VOICE_METHODS
+  STDMETHOD(Start)(UINT32 Flags = 0,
+                   UINT32 OperationSet = XE_XAUDIO2_COMMIT_NOW) = 0;
+  STDMETHOD(Stop)(UINT32 Flags = 0,
+                  UINT32 OperationSet = XE_XAUDIO2_COMMIT_NOW) = 0;
+  STDMETHOD(SubmitSourceBuffer)(
+      const XAUDIO2_BUFFER* pBuffer,
+      const XAUDIO2_BUFFER_WMA* pBufferWMA = nullptr) = 0;
+  STDMETHOD(FlushSourceBuffers)() = 0;
+  STDMETHOD(Discontinuity)() = 0;
+  STDMETHOD(ExitLoop)(UINT32 OperationSet = XE_XAUDIO2_COMMIT_NOW) = 0;
+  // 2.7: No Flags.
+  STDMETHOD_(void, GetState)(XAUDIO2_VOICE_STATE* pVoiceState) = 0;
+  STDMETHOD(SetFrequencyRatio)(float Ratio,
+                               UINT32 OperationSet = XE_XAUDIO2_COMMIT_NOW) = 0;
+  STDMETHOD_(void, GetFrequencyRatio)(float* pRatio) = 0;
+  STDMETHOD(SetSourceSampleRate)(UINT32 NewSourceSampleRate) = 0;
+};
+
+// IXAudio2SourceVoice 2.8.
+DECLARE_INTERFACE_(IXAudio2_8SourceVoice, IXAudio2Voice) {
+  XE_APU_XAUDIO2_API_DECLARE_IXAUDIO2VOICE_METHODS
+  STDMETHOD(Start)(UINT32 Flags = 0,
+                   UINT32 OperationSet = XE_XAUDIO2_COMMIT_NOW) = 0;
+  STDMETHOD(Stop)(UINT32 Flags = 0,
+                  UINT32 OperationSet = XE_XAUDIO2_COMMIT_NOW) = 0;
+  STDMETHOD(SubmitSourceBuffer)(
+      const XAUDIO2_BUFFER* pBuffer,
+      const XAUDIO2_BUFFER_WMA* pBufferWMA = nullptr) = 0;
+  STDMETHOD(FlushSourceBuffers)() = 0;
+  STDMETHOD(Discontinuity)() = 0;
+  STDMETHOD(ExitLoop)(UINT32 OperationSet = XE_XAUDIO2_COMMIT_NOW) = 0;
+  // 2.8: Flags added.
+  STDMETHOD_(void, GetState)(XAUDIO2_VOICE_STATE* pVoiceState,
+                             UINT32 Flags = 0) = 0;
+  STDMETHOD(SetFrequencyRatio)(float Ratio,
+                               UINT32 OperationSet = XE_XAUDIO2_COMMIT_NOW) = 0;
+  STDMETHOD_(void, GetFrequencyRatio)(float* pRatio) = 0;
+  STDMETHOD(SetSourceSampleRate)(UINT32 NewSourceSampleRate) = 0;
+};
+
+// IXAudio2MasteringVoice 2.7.
+DECLARE_INTERFACE_(IXAudio2_7MasteringVoice, IXAudio2Voice) {
+  XE_APU_XAUDIO2_API_DECLARE_IXAUDIO2VOICE_METHODS
+  // 2.7: No GetChannelMask.
+};
+
+// IXAudio2MasteringVoice 2.8.
+DECLARE_INTERFACE_(IXAudio2_8MasteringVoice, IXAudio2Voice) {
+  XE_APU_XAUDIO2_API_DECLARE_IXAUDIO2VOICE_METHODS
+  // 2.8: GetChannelMask added.
+  STDMETHOD(GetChannelMask)(DWORD* pChannelmask) = 0;
+};
+
+DECLARE_INTERFACE(IXAudio2VoiceCallback) {
+  // Called just before this voice's processing pass begins.
+  STDMETHOD_(void, OnVoiceProcessingPassStart)(UINT32 BytesRequired) = 0;
+  STDMETHOD_(void, OnVoiceProcessingPassEnd)() = 0;
+  STDMETHOD_(void, OnStreamEnd)() = 0;
+  STDMETHOD_(void, OnBufferStart)(void* pBufferContext) = 0;
+  STDMETHOD_(void, OnBufferEnd)(void* pBufferContext) = 0;
+  STDMETHOD_(void, OnLoopEnd)(void* pBufferContext) = 0;
+  STDMETHOD_(void, OnVoiceError)(void* pBufferContext, HRESULT Error) = 0;
+};
+
+#pragma pack(pop)
+
+}  // namespace api
+}  // namespace xaudio2
+}  // namespace apu
+}  // namespace xe
+
+#endif  // XENIA_APU_XAUDIO2_XAUDIO2_API_H_
diff --git a/src/xenia/apu/xaudio2/xaudio2_audio_driver.cc b/src/xenia/apu/xaudio2/xaudio2_audio_driver.cc
index fe3f8bd10..1f5d2ffc8 100644
--- a/src/xenia/apu/xaudio2/xaudio2_audio_driver.cc
+++ b/src/xenia/apu/xaudio2/xaudio2_audio_driver.cc
@@ -12,8 +12,6 @@
 // Must be included before xaudio2.h so we get the right windows.h include.
 #include "xenia/base/platform_win.h"
 
-#include <xaudio2.h>  // NOLINT(build/include_order)
-
 #include "xenia/apu/apu_flags.h"
 #include "xenia/base/clock.h"
 #include "xenia/base/logging.h"
@@ -22,7 +20,7 @@ namespace xe {
 namespace apu {
 namespace xaudio2 {
 
-class XAudio2AudioDriver::VoiceCallback : public IXAudio2VoiceCallback {
+class XAudio2AudioDriver::VoiceCallback : public api::IXAudio2VoiceCallback {
  public:
   explicit VoiceCallback(xe::threading::Semaphore* semaphore)
       : semaphore_(semaphore) {}
@@ -45,74 +43,97 @@ class XAudio2AudioDriver::VoiceCallback : public IXAudio2VoiceCallback {
 
 XAudio2AudioDriver::XAudio2AudioDriver(Memory* memory,
                                        xe::threading::Semaphore* semaphore)
-    : AudioDriver(memory), semaphore_(semaphore) {
-  static_assert(frame_count_ == XAUDIO2_MAX_QUEUED_BUFFERS,
-                "xaudio header differs");
-}
+    : AudioDriver(memory), semaphore_(semaphore) {}
 
 XAudio2AudioDriver::~XAudio2AudioDriver() = default;
 
-const DWORD ChannelMasks[] = {
-    0,
-    0,
-    SPEAKER_FRONT_LEFT | SPEAKER_FRONT_RIGHT | SPEAKER_LOW_FREQUENCY,
-    0,
-    0,
-    0,
-    SPEAKER_FRONT_LEFT | SPEAKER_FRONT_CENTER | SPEAKER_FRONT_RIGHT |
-        SPEAKER_LOW_FREQUENCY | SPEAKER_BACK_LEFT | SPEAKER_BACK_RIGHT,
-    0,
-};
-
 bool XAudio2AudioDriver::Initialize() {
   HRESULT hr;
 
   voice_callback_ = new VoiceCallback(semaphore_);
 
-  // Load XAudio2_8.dll dynamically - Windows 8.1 SDK references XAudio2_8.dll
-  // in xaudio2.lib, which is available on Windows 8.1, however, Windows 10 SDK
-  // references XAudio2_9.dll in it, which is only available in Windows 10, and
-  // XAudio2_8.dll is linked through a different .lib - xaudio2_8.lib, so easier
-  // not to link the .lib at all.
+  // Load the XAudio2 DLL dynamically. Needed both for 2.7 and for
+  // differentiating between 2.8 and later versions. Windows 8.1 SDK references
+  // XAudio2_8.dll in xaudio2.lib, which is available on Windows 8.1, however,
+  // Windows 10 SDK references XAudio2_9.dll in it, which is only available in
+  // Windows 10, and XAudio2_8.dll is linked through a different .lib -
+  // xaudio2_8.lib, so easier not to link the .lib at all.
   xaudio2_module_ = reinterpret_cast<void*>(LoadLibrary(L"XAudio2_8.dll"));
-  if (!xaudio2_module_) {
-    XELOGE("LoadLibrary(XAudio2_8.dll) failed");
-    assert_always();
-    return false;
+  if (xaudio2_module_) {
+    api_minor_version_ = 8;
+  } else {
+    xaudio2_module_ = reinterpret_cast<void*>(LoadLibrary(L"XAudio2_7.dll"));
+    if (xaudio2_module_) {
+      api_minor_version_ = 7;
+    } else {
+      XELOGE("Failed to load XAudio 2.8 or 2.7 library DLL");
+      assert_always();
+      return false;
+    }
   }
 
-  union {
-    HRESULT(__stdcall* xaudio2_create)
-    (IXAudio2** xaudio2_out, UINT32 flags, XAUDIO2_PROCESSOR xaudio2_processor);
-    FARPROC xaudio2_create_ptr;
-  };
-  xaudio2_create_ptr = GetProcAddress(
-      reinterpret_cast<HMODULE>(xaudio2_module_), "XAudio2Create");
-  if (!xaudio2_create_ptr) {
-    XELOGE("GetProcAddress(XAudio2_8.dll, XAudio2Create) failed");
-    assert_always();
-    return false;
+  // First CPU (2.8 default). XAUDIO2_ANY_PROCESSOR (2.7 default) steals too
+  // much time from other things. Ideally should process audio on what roughly
+  // represents thread 4 (5th) on the Xbox 360 (2.7 default on the console), or
+  // even beyond the 6 guest cores.
+  api::XAUDIO2_PROCESSOR processor = 0x00000001;
+  if (api_minor_version_ >= 8) {
+    union {
+      // clang-format off
+      HRESULT (__stdcall* xaudio2_create)(
+          api::IXAudio2_8** xaudio2_out, UINT32 flags,
+          api::XAUDIO2_PROCESSOR xaudio2_processor);
+      // clang-format on
+      FARPROC xaudio2_create_ptr;
+    };
+    xaudio2_create_ptr = GetProcAddress(
+        reinterpret_cast<HMODULE>(xaudio2_module_), "XAudio2Create");
+    if (!xaudio2_create_ptr) {
+      XELOGE("XAudio2Create not found in XAudio2_8.dll");
+      assert_always();
+      return false;
+    }
+    hr = xaudio2_create(&objects_.api_2_8.audio, 0, processor);
+    if (FAILED(hr)) {
+      XELOGE("XAudio2Create failed with %.8X", hr);
+      assert_always();
+      return false;
+    }
+    return InitializeObjects(objects_.api_2_8);
+  } else {
+    hr = CoCreateInstance(__uuidof(api::XAudio2_7), NULL, CLSCTX_INPROC_SERVER,
+                          IID_PPV_ARGS(&objects_.api_2_7.audio));
+    if (FAILED(hr)) {
+      XELOGE("CoCreateInstance for XAudio2 failed with %.8X", hr);
+      assert_always();
+      return false;
+    }
+    hr = objects_.api_2_7.audio->Initialize(0, processor);
+    if (FAILED(hr)) {
+      XELOGE("IXAudio2::Initialize failed with %.8X", hr);
+      assert_always();
+      return false;
+    }
+    return InitializeObjects(objects_.api_2_7);
   }
+}
 
-  hr = xaudio2_create(&audio_, 0, XAUDIO2_DEFAULT_PROCESSOR);
-  if (FAILED(hr)) {
-    XELOGE("XAudio2Create failed with %.8X", hr);
-    assert_always();
-    return false;
-  }
+template <typename Objects>
+bool XAudio2AudioDriver::InitializeObjects(Objects& objects) {
+  HRESULT hr;
 
-  XAUDIO2_DEBUG_CONFIGURATION config;
-  config.TraceMask = XAUDIO2_LOG_ERRORS | XAUDIO2_LOG_WARNINGS;
+  api::XAUDIO2_DEBUG_CONFIGURATION config;
+  config.TraceMask = api::XE_XAUDIO2_LOG_ERRORS | api::XE_XAUDIO2_LOG_WARNINGS;
   config.BreakMask = 0;
   config.LogThreadID = FALSE;
   config.LogTiming = TRUE;
   config.LogFunctionName = TRUE;
   config.LogFileline = TRUE;
-  audio_->SetDebugConfiguration(&config);
+  objects.audio->SetDebugConfiguration(&config);
 
-  hr = audio_->CreateMasteringVoice(&mastering_voice_);
+  hr = objects.audio->CreateMasteringVoice(&objects.mastering_voice);
   if (FAILED(hr)) {
-    XELOGE("CreateMasteringVoice failed with %.8X", hr);
+    XELOGE("IXAudio2::CreateMasteringVoice failed with %.8X", hr);
     assert_always();
     return false;
   }
@@ -132,27 +153,38 @@ bool XAudio2AudioDriver::Initialize() {
 
   waveformat.SubFormat = KSDATAFORMAT_SUBTYPE_IEEE_FLOAT;
   waveformat.Samples.wValidBitsPerSample = waveformat.Format.wBitsPerSample;
-  waveformat.dwChannelMask = ChannelMasks[waveformat.Format.nChannels];
+  static const DWORD kChannelMasks[] = {
+      0,
+      0,
+      SPEAKER_FRONT_LEFT | SPEAKER_FRONT_RIGHT,
+      0,
+      0,
+      0,
+      SPEAKER_FRONT_LEFT | SPEAKER_FRONT_CENTER | SPEAKER_FRONT_RIGHT |
+          SPEAKER_LOW_FREQUENCY | SPEAKER_BACK_LEFT | SPEAKER_BACK_RIGHT,
+      0,
+  };
+  waveformat.dwChannelMask = kChannelMasks[waveformat.Format.nChannels];
 
-  hr = audio_->CreateSourceVoice(
-      &pcm_voice_, &waveformat.Format,
-      0,  // XAUDIO2_VOICE_NOSRC | XAUDIO2_VOICE_NOPITCH,
-      XAUDIO2_MAX_FREQ_RATIO, voice_callback_);
+  hr = objects.audio->CreateSourceVoice(
+      &objects.pcm_voice, &waveformat.Format,
+      0,  // api::XE_XAUDIO2_VOICE_NOSRC | api::XE_XAUDIO2_VOICE_NOPITCH,
+      api::XE_XAUDIO2_MAX_FREQ_RATIO, voice_callback_);
   if (FAILED(hr)) {
-    XELOGE("CreateSourceVoice failed with %.8X", hr);
+    XELOGE("IXAudio2::CreateSourceVoice failed with %.8X", hr);
     assert_always();
     return false;
   }
 
-  hr = pcm_voice_->Start();
+  hr = objects.pcm_voice->Start();
   if (FAILED(hr)) {
-    XELOGE("Start failed with %.8X", hr);
+    XELOGE("IXAudio2SourceVoice::Start failed with %.8X", hr);
     assert_always();
     return false;
   }
 
   if (cvars::mute) {
-    pcm_voice_->SetVolume(0.0f);
+    objects.pcm_voice->SetVolume(0.0f);
   }
 
   return true;
@@ -162,8 +194,13 @@ void XAudio2AudioDriver::SubmitFrame(uint32_t frame_ptr) {
   // Process samples! They are big-endian floats.
   HRESULT hr;
 
-  XAUDIO2_VOICE_STATE state;
-  pcm_voice_->GetState(&state, XAUDIO2_VOICE_NOSAMPLESPLAYED);
+  api::XAUDIO2_VOICE_STATE state;
+  if (api_minor_version_ >= 8) {
+    objects_.api_2_8.pcm_voice->GetState(&state,
+                                         api::XE_XAUDIO2_VOICE_NOSAMPLESPLAYED);
+  } else {
+    objects_.api_2_7.pcm_voice->GetState(&state);
+  }
   assert_true(state.BuffersQueued < frame_count_);
 
   auto input_frame = memory_->TranslateVirtual<float*>(frame_ptr);
@@ -178,17 +215,21 @@ void XAudio2AudioDriver::SubmitFrame(uint32_t frame_ptr) {
     }
   }
 
-  XAUDIO2_BUFFER buffer;
+  api::XAUDIO2_BUFFER buffer;
   buffer.Flags = 0;
   buffer.pAudioData = reinterpret_cast<BYTE*>(output_frame);
   buffer.AudioBytes = frame_size_;
   buffer.PlayBegin = 0;
   buffer.PlayLength = channel_samples_;
-  buffer.LoopBegin = XAUDIO2_NO_LOOP_REGION;
+  buffer.LoopBegin = api::XE_XAUDIO2_NO_LOOP_REGION;
   buffer.LoopLength = 0;
   buffer.LoopCount = 0;
   buffer.pContext = 0;
-  hr = pcm_voice_->SubmitSourceBuffer(&buffer);
+  if (api_minor_version_ >= 8) {
+    hr = objects_.api_2_8.pcm_voice->SubmitSourceBuffer(&buffer);
+  } else {
+    hr = objects_.api_2_7.pcm_voice->SubmitSourceBuffer(&buffer);
+  }
   if (FAILED(hr)) {
     XELOGE("SubmitSourceBuffer failed with %.8X", hr);
     assert_always();
@@ -199,26 +240,19 @@ void XAudio2AudioDriver::SubmitFrame(uint32_t frame_ptr) {
 
   // Update playback ratio to our time scalar.
   // This will keep audio in sync with the game clock.
-  pcm_voice_->SetFrequencyRatio(
-      static_cast<float>(xe::Clock::guest_time_scalar()));
+  float frequency_ratio = static_cast<float>(xe::Clock::guest_time_scalar());
+  if (api_minor_version_ >= 8) {
+    objects_.api_2_8.pcm_voice->SetFrequencyRatio(frequency_ratio);
+  } else {
+    objects_.api_2_7.pcm_voice->SetFrequencyRatio(frequency_ratio);
+  }
 }
 
 void XAudio2AudioDriver::Shutdown() {
-  if (pcm_voice_) {
-    pcm_voice_->Stop();
-    pcm_voice_->DestroyVoice();
-    pcm_voice_ = NULL;
-  }
-
-  if (mastering_voice_) {
-    mastering_voice_->DestroyVoice();
-    mastering_voice_ = NULL;
-  }
-
-  if (audio_) {
-    audio_->StopEngine();
-    audio_->Release();
-    audio_ = nullptr;
+  if (api_minor_version_ >= 8) {
+    ShutdownObjects(objects_.api_2_8);
+  } else {
+    ShutdownObjects(objects_.api_2_7);
   }
 
   if (xaudio2_module_) {
@@ -232,6 +266,26 @@ void XAudio2AudioDriver::Shutdown() {
   }
 }
 
+template <typename Objects>
+void XAudio2AudioDriver::ShutdownObjects(Objects& objects) {
+  if (objects.pcm_voice) {
+    objects.pcm_voice->Stop();
+    objects.pcm_voice->DestroyVoice();
+    objects.pcm_voice = nullptr;
+  }
+
+  if (objects.mastering_voice) {
+    objects.mastering_voice->DestroyVoice();
+    objects.mastering_voice = nullptr;
+  }
+
+  if (objects.audio) {
+    objects.audio->StopEngine();
+    objects.audio->Release();
+    objects.audio = nullptr;
+  }
+}
+
 }  // namespace xaudio2
 }  // namespace apu
 }  // namespace xe
diff --git a/src/xenia/apu/xaudio2/xaudio2_audio_driver.h b/src/xenia/apu/xaudio2/xaudio2_audio_driver.h
index 32429d084..42d4b59a9 100644
--- a/src/xenia/apu/xaudio2/xaudio2_audio_driver.h
+++ b/src/xenia/apu/xaudio2/xaudio2_audio_driver.h
@@ -11,6 +11,7 @@
 #define XENIA_APU_XAUDIO2_XAUDIO2_AUDIO_DRIVER_H_
 
 #include "xenia/apu/audio_driver.h"
+#include "xenia/apu/xaudio2/xaudio2_api.h"
 #include "xenia/base/threading.h"
 
 struct IXAudio2;
@@ -31,16 +32,31 @@ class XAudio2AudioDriver : public AudioDriver {
   void Shutdown();
 
  private:
+  template <typename Objects>
+  bool InitializeObjects(Objects& objects);
+  template <typename Objects>
+  void ShutdownObjects(Objects& objects);
+
   void* xaudio2_module_ = nullptr;
-  IXAudio2* audio_ = nullptr;
-  IXAudio2MasteringVoice* mastering_voice_ = nullptr;
-  IXAudio2SourceVoice* pcm_voice_ = nullptr;
+  uint32_t api_minor_version_ = 7;
+  union {
+    struct {
+      api::IXAudio2_7* audio;
+      api::IXAudio2_7MasteringVoice* mastering_voice;
+      api::IXAudio2_7SourceVoice* pcm_voice;
+    } api_2_7;
+    struct {
+      api::IXAudio2_8* audio;
+      api::IXAudio2_8MasteringVoice* mastering_voice;
+      api::IXAudio2_8SourceVoice* pcm_voice;
+    } api_2_8;
+  } objects_ = {};
   xe::threading::Semaphore* semaphore_ = nullptr;
 
   class VoiceCallback;
   VoiceCallback* voice_callback_ = nullptr;
 
-  static const uint32_t frame_count_ = 64;
+  static const uint32_t frame_count_ = api::XE_XAUDIO2_MAX_QUEUED_BUFFERS;
   static const uint32_t frame_channels_ = 6;
   static const uint32_t channel_samples_ = 256;
   static const uint32_t frame_samples_ = frame_channels_ * channel_samples_;
diff --git a/src/xenia/apu/xaudio2/xaudio2_audio_system.cc b/src/xenia/apu/xaudio2/xaudio2_audio_system.cc
index 37869a196..e9ddeb6ec 100644
--- a/src/xenia/apu/xaudio2/xaudio2_audio_system.cc
+++ b/src/xenia/apu/xaudio2/xaudio2_audio_system.cc
@@ -9,8 +9,6 @@
 
 #include "xenia/apu/xaudio2/xaudio2_audio_system.h"
 
-#include <xaudio2.h>
-
 #include "xenia/apu/apu_flags.h"
 #include "xenia/apu/xaudio2/xaudio2_audio_driver.h"