text: /*************************************************************************/
  /*  audio_driver_xaudio2.h                                               */
  /*************************************************************************/
  /*                       This file is part of:                           */
  /*                           Valjang Engine                                */
  /*                      http://Valjang.fr                          */
  /*************************************************************************/
  /* Copyright (c) 2007-2020 Valjang.                 */
  /* Copyright (c) 2014-2020 Valjang Engine contributors (cf. AUTHORS.md).   */
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  /* The above copyright notice and this permission notice shall be        */
  /* included in all copies or substantial portions of the Software.       */
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  /*************************************************************************/
  
  #ifndef AUDIO_DRIVER_XAUDIO2_H
  #define AUDIO_DRIVER_XAUDIO2_H
  
  #include "core/os/mutex.h"
  #include "core/os/thread.h"
  #include "servers/audio_server.h"
  
  #include <mmsystem.h>
  #include <windows.h>
  #include <wrl/client.h>
  #include <xaudio2.h>
  
  class AudioDriverXAudio2 : public AudioDriver {
  	enum {
  		AUDIO_BUFFERS = 2
  	};
  
  	struct XAudio2DriverVoiceCallback : public IXAudio2VoiceCallback {
  		HANDLE buffer_end_event;
  		XAudio2DriverVoiceCallback() :
  				buffer_end_event(CreateEvent(nullptr, FALSE, FALSE, nullptr)) {}
  		void STDMETHODCALLTYPE OnBufferEnd(void *pBufferContext) {
  			SetEvent(buffer_end_event);
  		}
  
  		//Unused methods are stubs
  		void STDMETHODCALLTYPE OnStreamEnd() {}
  		void STDMETHODCALLTYPE OnVoiceProcessingPassEnd() {}
  		void STDMETHODCALLTYPE OnVoiceProcessingPassStart(UINT32 SamplesRequired) {}
  		void STDMETHODCALLTYPE OnBufferStart(void *pBufferContext) {}
  		void STDMETHODCALLTYPE OnLoopEnd(void *pBufferContext) {}
  		void STDMETHODCALLTYPE OnVoiceError(void *pBufferContext, HRESULT Error) {}
  	};
  
  	Thread *thread = nullptr;
  	Mutex mutex;
  
  	int32_t *samples_in;
  	int16_t *samples_out[AUDIO_BUFFERS];
  
  	static void thread_func(void *p_udata);
  	int buffer_size;
  
  	unsigned int mix_rate;
  	SpeakerMode speaker_mode;
  
  	int channels;
  
  	bool active;
  	bool thread_exited;
  	mutable bool exit_thread;
  	bool pcm_open;
  
  	WAVEFORMATEX wave_format = { 0 };
  	Microsoft::WRL::ComPtr<IXAudio2> xaudio;
  	int current_buffer = 0;
  	IXAudio2MasteringVoice *mastering_voice;
  	XAUDIO2_BUFFER xaudio_buffer[AUDIO_BUFFERS];
  	IXAudio2SourceVoice *source_voice;
  	XAudio2DriverVoiceCallback voice_callback;
  
  public:
  	const char *get_name() const;
  
  	virtual Error init();
  	virtual void start();
  	virtual int get_mix_rate() const;
  	virtual SpeakerMode get_speaker_mode() const;
  	virtual float get_latency();
  	virtual void lock();
  	virtual void unlock();
  	virtual void finish();
  
  	AudioDriverXAudio2();
  	~AudioDriverXAudio2() {}
  };
  
  #endif
  