1/**************************************************************************/
2/* audio_effect_phaser.h */
3/**************************************************************************/
4/* This file is part of: */
5/* GODOT ENGINE */
6/* https://godotengine.org */
7/**************************************************************************/
8/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
9/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
10/* */
11/* Permission is hereby granted, free of charge, to any person obtaining */
12/* a copy of this software and associated documentation files (the */
13/* "Software"), to deal in the Software without restriction, including */
14/* without limitation the rights to use, copy, modify, merge, publish, */
15/* distribute, sublicense, and/or sell copies of the Software, and to */
16/* permit persons to whom the Software is furnished to do so, subject to */
17/* the following conditions: */
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20/* included in all copies or substantial portions of the Software. */
21/* */
22/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
23/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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28/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
29/**************************************************************************/
30
31#ifndef AUDIO_EFFECT_PHASER_H
32#define AUDIO_EFFECT_PHASER_H
33
34#include "servers/audio/audio_effect.h"
35
36class AudioEffectPhaser;
37
38class AudioEffectPhaserInstance : public AudioEffectInstance {
39 GDCLASS(AudioEffectPhaserInstance, AudioEffectInstance);
40 friend class AudioEffectPhaser;
41 Ref<AudioEffectPhaser> base;
42
43 float phase;
44 AudioFrame h;
45
46 class AllpassDelay {
47 float a, h;
48
49 public:
50 _ALWAYS_INLINE_ void delay(float d) {
51 a = (1.f - d) / (1.f + d);
52 }
53
54 _ALWAYS_INLINE_ float update(float s) {
55 float y = s * -a + h;
56 h = y * a + s;
57 return y;
58 }
59
60 AllpassDelay() {
61 a = 0;
62 h = 0;
63 }
64 };
65
66 AllpassDelay allpass[2][6];
67
68public:
69 virtual void process(const AudioFrame *p_src_frames, AudioFrame *p_dst_frames, int p_frame_count) override;
70};
71
72class AudioEffectPhaser : public AudioEffect {
73 GDCLASS(AudioEffectPhaser, AudioEffect);
74
75 friend class AudioEffectPhaserInstance;
76 float range_min;
77 float range_max;
78 float rate;
79 float feedback;
80 float depth;
81
82protected:
83 static void _bind_methods();
84
85public:
86 Ref<AudioEffectInstance> instantiate() override;
87
88 void set_range_min_hz(float p_hz);
89 float get_range_min_hz() const;
90
91 void set_range_max_hz(float p_hz);
92 float get_range_max_hz() const;
93
94 void set_rate_hz(float p_hz);
95 float get_rate_hz() const;
96
97 void set_feedback(float p_fbk);
98 float get_feedback() const;
99
100 void set_depth(float p_depth);
101 float get_depth() const;
102
103 AudioEffectPhaser();
104};
105
106#endif // AUDIO_EFFECT_PHASER_H
107