dolphin/Source/Core/AudioCommon/Src/XAudio2Stream.h

// Copyright 2013 Dolphin Emulator Project
// Licensed under GPLv2
// Refer to the license.txt file included.

// This audio backend uses XAudio2 via XAUDIO2_DLL
// It works on Windows 8+, where it is included as an OS component.
// This backend is always compiled, but only available if running on Win8+

#pragma once

#include <memory>
#include "Thread.h"
#include "SoundStream.h"

#ifdef _WIN32

struct StreamingVoiceContext;
struct IXAudio2;
struct IXAudio2MasteringVoice;

#endif

class XAudio2 : public SoundStream
{
#ifdef _WIN32

private:
	class Releaser
	{
	public:
		template <typename R>
		void operator()(R* ptr)
		{
			ptr->Release();
		}
	};

	std::unique_ptr<IXAudio2, Releaser> m_xaudio2;
	std::unique_ptr<StreamingVoiceContext> m_voice_context;
	IXAudio2MasteringVoice *m_mastering_voice;

	Common::Event m_sound_sync_event;
	float m_volume;

	const bool m_cleanup_com;

	static HMODULE m_xaudio2_dll;
	static void *PXAudio2Create;

	static bool InitLibrary();

public:
	XAudio2(CMixer *mixer);
	virtual ~XAudio2();
 
	virtual bool Start();
	virtual void Stop();

	virtual void Update();
	virtual void Clear(bool mute);
	virtual void SetVolume(int volume);
	virtual bool usesMixer() const { return true; }

	static bool isValid() { return InitLibrary(); }

#else

public:
	XAudio2(CMixer *mixer)
		: SoundStream(mixer)
	{}

#endif
};