godot/drivers/wasapi/audio_driver_wasapi.h

/*************************************************************************/
/*  audio_driver_wasapi.h                                                */
/*************************************************************************/
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/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
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#ifndef AUDIO_DRIVER_WASAPI_H
#define AUDIO_DRIVER_WASAPI_H

#ifdef WASAPI_ENABLED

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

#include <audioclient.h>
#include <mmdeviceapi.h>
#define WIN32_LEAN_AND_MEAN
#include <windows.h>

class AudioDriverWASAPI : public AudioDriver {
	class AudioDeviceWASAPI {
	public:
		IAudioClient *audio_client = nullptr;
		IAudioRenderClient *render_client = nullptr;
		IAudioCaptureClient *capture_client = nullptr;
		bool active = false;

		WORD format_tag = 0;
		WORD bits_per_sample = 0;
		unsigned int channels = 0;
		unsigned int frame_size = 0;

		String device_name = "Default";
		String new_device = "Default";

		AudioDeviceWASAPI() {}
	};

	AudioDeviceWASAPI audio_input;
	AudioDeviceWASAPI audio_output;

	Mutex mutex;
	Thread thread;

	Vector<int32_t> samples_in;

	unsigned int channels = 0;
	int mix_rate = 0;
	int buffer_frames = 0;
	int target_latency_ms = 0;
	float real_latency = 0.0;
	bool using_audio_client_3 = false;

	bool thread_exited = false;
	mutable bool exit_thread = false;

	static _FORCE_INLINE_ void write_sample(WORD format_tag, int bits_per_sample, BYTE *buffer, int i, int32_t sample);
	static _FORCE_INLINE_ int32_t read_sample(WORD format_tag, int bits_per_sample, BYTE *buffer, int i);
	static void thread_func(void *p_udata);

	Error init_render_device(bool reinit = false);
	Error init_capture_device(bool reinit = false);

	Error finish_render_device();
	Error finish_capture_device();

	Error audio_device_init(AudioDeviceWASAPI *p_device, bool p_capture, bool reinit);
	Error audio_device_finish(AudioDeviceWASAPI *p_device);
	Array audio_device_get_list(bool p_capture);

public:
	virtual const char *get_name() const {
		return "WASAPI";
	}

	virtual Error init();
	virtual void start();
	virtual int get_mix_rate() const;
	virtual float get_latency();
	virtual SpeakerMode get_speaker_mode() const;
	virtual Array get_device_list();
	virtual String get_device();
	virtual void set_device(String device);
	virtual void lock();
	virtual void unlock();
	virtual void finish();

	virtual Error capture_start();
	virtual Error capture_stop();
	virtual Array capture_get_device_list();
	virtual void capture_set_device(const String &p_name);
	virtual String capture_get_device();

	AudioDriverWASAPI();
};

#endif // WASAPI_ENABLED
#endif // AUDIO_DRIVER_WASAPI_H