pandemonium_engine_minimal/scene/2d/audio_stream_player_2d.h

#ifndef AUDIO_STREAM_PLAYER_2D_H
#define AUDIO_STREAM_PLAYER_2D_H
/*************************************************************************/
/*  audio_stream_player_2d.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).   */
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/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
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/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
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/* 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.*/
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/*************************************************************************/

#include "core/math/audio_frame.h"
#include "core/object/reference.h"
#include "core/os/safe_refcount.h"
#include "scene/main/node_2d.h"

class AudioStreamPlayback;
class AudioStream;

class AudioStreamPlayer2D : public Node2D {
	GDCLASS(AudioStreamPlayer2D, Node2D);

private:
	enum {
		MAX_OUTPUTS = 8,
		MAX_INTERSECT_AREAS = 32

	};

	struct Output {
		AudioFrame vol;
		int bus_index;
		Viewport *viewport; //pointer only used for reference to previous mix
	};

	Output outputs[MAX_OUTPUTS];
	SafeNumeric<int> output_count;
	SafeFlag output_ready;

	//these are used by audio thread to have a reference of previous volumes (for ramping volume and avoiding clicks)
	Output prev_outputs[MAX_OUTPUTS];
	int prev_output_count;

	Ref<AudioStreamPlayback> stream_playback;
	Ref<AudioStream> stream;
	Vector<AudioFrame> mix_buffer;

	SafeNumeric<float> setseek;
	SafeFlag active;
	SafeNumeric<float> setplay;

	float volume_db;
	float pitch_scale;
	bool autoplay;
	bool stream_paused;
	bool stream_paused_fade_in;
	bool stream_paused_fade_out;
	StringName bus;

	void _mix_audio();
	static void _mix_audios(void *self) { reinterpret_cast<AudioStreamPlayer2D *>(self)->_mix_audio(); }

	void _set_playing(bool p_enable);
	bool _is_active() const;

	void _bus_layout_changed();

	uint32_t area_mask;

	float max_distance;
	float attenuation;

	float panning_strength = 1.0f;
	float cached_global_panning_strength = 1.0f;

protected:
	void _validate_property(PropertyInfo &property) const;
	void _notification(int p_what);
	static void _bind_methods();

public:
	void set_stream(Ref<AudioStream> p_stream);
	Ref<AudioStream> get_stream() const;

	void set_volume_db(float p_volume);
	float get_volume_db() const;

	void set_pitch_scale(float p_pitch_scale);
	float get_pitch_scale() const;

	void play(float p_from_pos = 0.0);
	void seek(float p_seconds);
	void stop();
	bool is_playing() const;
	float get_playback_position();

	void set_bus(const StringName &p_bus);
	StringName get_bus() const;

	void set_autoplay(bool p_enable);
	bool is_autoplay_enabled();

	void set_max_distance(float p_pixels);
	float get_max_distance() const;

	void set_attenuation(float p_curve);
	float get_attenuation() const;

	void set_panning_strength(float p_panning_strength);
	float get_panning_strength() const;

	void set_area_mask(uint32_t p_mask);
	uint32_t get_area_mask() const;

	void set_stream_paused(bool p_pause);
	bool get_stream_paused() const;

	Ref<AudioStreamPlayback> get_stream_playback();

	AudioStreamPlayer2D();
	~AudioStreamPlayer2D();
};

#endif