pandemonium_engine/drivers/xaudio2/audio_driver_xaudio2.h

#ifndef AUDIO_DRIVER_XAUDIO2_H
#define AUDIO_DRIVER_XAUDIO2_H
/*************************************************************************/
/*  audio_driver_xaudio2.h                                               */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
/*************************************************************************/
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/

#include "core/os/mutex.h"
#include "core/os/thread.h"
#include "core/safe_refcount.h"
#include "servers/audio_server.h"

#include <mmsystem.h>
#define WIN32_LEAN_AND_MEAN
#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(NULL, FALSE, FALSE, NULL)) {}
		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;
	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;

	SafeFlag active;
	SafeFlag exit_thread;
	bool pcm_open;

	WAVEFORMATEX wave_format;
	Microsoft::WRL::ComPtr<IXAudio2> xaudio;
	int current_buffer;
	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