audio_driver_alsa.h

/**************************************************************************/
/*  audio_driver_alsa.h                                                   */
/**************************************************************************/
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/*                             GODOT ENGINE                               */
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
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#pragma once

#ifdef ALSA_ENABLED

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

#ifdef SOWRAP_ENABLED
#include "asound-so_wrap.h"
#else
#include <alsa/asoundlib.h>
#endif

class AudioDriverALSA : public AudioDriver {
	Thread thread;
	Mutex mutex;

	snd_pcm_t *pcm_handle = nullptr;

	String output_device_name = "Default";
	String new_output_device = "Default";

	Vector<int32_t> samples_in;
	Vector<int16_t> samples_out;

	Error init_output_device();
	void finish_output_device();

	static void thread_func(void *p_udata);

	unsigned int mix_rate = 0;
	SpeakerMode speaker_mode;

	snd_pcm_uframes_t buffer_frames;
	snd_pcm_uframes_t buffer_size;
	snd_pcm_uframes_t period_size;
	int channels = 0;

	SafeFlag active;
	SafeFlag exit_thread;

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

	virtual Error init() override;
	virtual void start() override;
	virtual int get_mix_rate() const override;
	virtual SpeakerMode get_speaker_mode() const override;

	virtual void lock() override;
	virtual void unlock() override;
	virtual void finish() override;

	virtual PackedStringArray get_output_device_list() override;
	virtual String get_output_device() override;
	virtual void set_output_device(const String &p_name) override;

	AudioDriverALSA() {}
	~AudioDriverALSA() {}
};

#endif // ALSA_ENABLED