113 lines
3.4 KiB
C++
113 lines
3.4 KiB
C++
/*************************************************************************/
|
|
/* eq.h */
|
|
/*************************************************************************/
|
|
/* This file is part of: */
|
|
/* GODOT ENGINE */
|
|
/* https://godotengine.org */
|
|
/*************************************************************************/
|
|
/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur. */
|
|
/* Copyright (c) 2014-2018 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. */
|
|
/*************************************************************************/
|
|
|
|
// Author: reduzio@gmail.com (C) 2006
|
|
|
|
#ifndef EQ_FILTER_H
|
|
#define EQ_FILTER_H
|
|
|
|
#include "typedefs.h"
|
|
#include "vector.h"
|
|
|
|
/**
|
|
@author Juan Linietsky
|
|
*/
|
|
|
|
class EQ {
|
|
public:
|
|
enum Preset {
|
|
|
|
PRESET_6_BANDS,
|
|
PRESET_8_BANDS,
|
|
PRESET_10_BANDS,
|
|
PRESET_21_BANDS,
|
|
PRESET_31_BANDS
|
|
};
|
|
|
|
class BandProcess {
|
|
|
|
friend class EQ;
|
|
float c1, c2, c3;
|
|
struct History {
|
|
float a1, a2, a3;
|
|
float b1, b2, b3;
|
|
|
|
} history;
|
|
|
|
public:
|
|
inline void process_one(float &p_data);
|
|
|
|
BandProcess();
|
|
};
|
|
|
|
private:
|
|
struct Band {
|
|
|
|
float freq;
|
|
float c1, c2, c3;
|
|
};
|
|
|
|
Vector<Band> band;
|
|
|
|
float mix_rate;
|
|
|
|
void recalculate_band_coefficients();
|
|
|
|
public:
|
|
void set_mix_rate(float p_mix_rate);
|
|
|
|
int get_band_count() const;
|
|
void set_preset_band_mode(Preset p_preset);
|
|
void set_bands(const Vector<float> &p_bands);
|
|
BandProcess get_band_processor(int p_band) const;
|
|
float get_band_frequency(int p_band);
|
|
|
|
EQ();
|
|
~EQ();
|
|
};
|
|
|
|
/* Inline Function */
|
|
|
|
inline void EQ::BandProcess::process_one(float &p_data) {
|
|
|
|
history.a1 = p_data;
|
|
|
|
history.b1 = c1 * (history.a1 - history.a3) + c3 * history.b2 - c2 * history.b3;
|
|
|
|
p_data = history.b1;
|
|
|
|
history.a3 = history.a2;
|
|
history.a2 = history.a1;
|
|
history.b3 = history.b2;
|
|
history.b2 = history.b1;
|
|
}
|
|
|
|
#endif
|