mirror of
https://github.com/Relintai/pandemonium_engine_minimal.git
synced 2025-01-04 20:59:36 +01:00
83 lines
1.3 KiB
C++
83 lines
1.3 KiB
C++
#ifndef EQ_FILTER_H
|
|
#define EQ_FILTER_H
|
|
|
|
/* eq.h */
|
|
|
|
|
|
// Author: reduzio@gmail.com (C) 2006
|
|
|
|
#include "core/typedefs.h"
|
|
#include "core/containers/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
|