ref: f98d24f939182df6a21177b8dde5937d160c8996
dir: /LEAF/Inc/leaf-filters.h/
/*==============================================================================
leaf-filters.h
Created: 20 Jan 2017 12:01:10pm
Author: Michael R Mulshine
==============================================================================*/
#ifndef LEAF_FILTERS_H_INCLUDED
#define LEAF_FILTERS_H_INCLUDED
#ifdef __cplusplus
extern "C" {
#endif
//==============================================================================
#include "leaf-math.h"
#include "leaf-mempool.h"
#include "leaf-delay.h"
#include "leaf-tables.h"
/*!
* @internal
* Header.
* @include basic-oscillators.h
* @example basic-oscillators.c
* An example.
*/
//==============================================================================
/* tAllpass: Schroeder allpass. Comb-filter with feedforward and feedback. */
typedef struct _tAllpass
{
float gain;
tLinearDelay delay;
float lastOut;
} _tAllpass;
typedef _tAllpass* tAllpass;
void tAllpass_init (tAllpass* const, float initDelay, uint32_t maxDelay);
void tAllpass_free (tAllpass* const);
void tAllpass_initToPool (tAllpass* const, float initDelay, uint32_t maxDelay, tMempool* const);
void tAllpass_freeFromPool (tAllpass* const, tMempool* const);
float tAllpass_tick (tAllpass* const, float input);
void tAllpass_setGain (tAllpass* const, float gain);
void tAllpass_setDelay (tAllpass* const, float delay);
//==============================================================================
/* tOnePole: OnePole filter, reimplemented from STK (Cook and Scavone). */
typedef struct _tOnePole
{
float gain;
float a0,a1;
float b0,b1;
float lastIn, lastOut;
} _tOnePole;
typedef _tOnePole* tOnePole;
void tOnePole_init (tOnePole* const, float thePole);
void tOnePole_free (tOnePole* const);
void tOnePole_initToPool (tOnePole* const, float thePole, tMempool* const);
void tOnePole_freeFromPool (tOnePole* const, tMempool* const);
float tOnePole_tick (tOnePole* const, float input);
void tOnePole_setB0 (tOnePole* const, float b0);
void tOnePole_setA1 (tOnePole* const, float a1);
void tOnePole_setPole (tOnePole* const, float thePole);
void tOnePole_setFreq (tOnePole* const, float freq);
void tOnePole_setCoefficients(tOnePole* const, float b0, float a1);
void tOnePole_setGain (tOnePole* const, float gain);
//==============================================================================
/* TwoPole filter, reimplemented from STK (Cook and Scavone). */
typedef struct _tTwoPole
{
float gain;
float a0, a1, a2;
float b0;
float radius, frequency;
oBool normalize;
float lastOut[2];
} _tTwoPole;
typedef _tTwoPole* tTwoPole;
void tTwoPole_init (tTwoPole* const);
void tTwoPole_free (tTwoPole* const);
void tTwoPole_initToPool (tTwoPole* const, tMempool* const);
void tTwoPole_freeFromPool (tTwoPole* const, tMempool* const);
float tTwoPole_tick (tTwoPole* const, float input);
void tTwoPole_setB0 (tTwoPole* const, float b0);
void tTwoPole_setA1 (tTwoPole* const, float a1);
void tTwoPole_setA2 (tTwoPole* const, float a2);
void tTwoPole_setResonance (tTwoPole* const, float freq, float radius, oBool normalize);
void tTwoPole_setCoefficients(tTwoPole* const, float b0, float a1, float a2);
void tTwoPole_setGain (tTwoPole* const, float gain);
//==============================================================================
/* OneZero filter, reimplemented from STK (Cook and Scavone). */
typedef struct _tOneZero
{
float gain;
float b0,b1;
float lastIn, lastOut, frequency;
} _tOneZero;
typedef _tOneZero* tOneZero;
void tOneZero_init (tOneZero* const, float theZero);
void tOneZero_free (tOneZero* const);
void tOneZero_initToPool (tOneZero* const, float theZero, tMempool* const);
void tOneZero_freeFromPool (tOneZero* const, tMempool* const);
float tOneZero_tick (tOneZero* const, float input);
void tOneZero_setB0 (tOneZero* const, float b0);
void tOneZero_setB1 (tOneZero* const, float b1);
void tOneZero_setZero (tOneZero* const, float theZero);
void tOneZero_setCoefficients(tOneZero* const, float b0, float b1);
void tOneZero_setGain (tOneZero* const, float gain);
float tOneZero_getPhaseDelay (tOneZero *f, float frequency );
//==============================================================================
/* TwoZero filter, reimplemented from STK (Cook and Scavone). */
typedef struct _tTwoZero
{
float gain;
float b0, b1, b2;
float frequency, radius;
float lastIn[2];
} _tTwoZero;
typedef _tTwoZero* tTwoZero;
void tTwoZero_init (tTwoZero* const);
void tTwoZero_free (tTwoZero* const);
void tTwoZero_initToPool (tTwoZero* const, tMempool* const);
void tTwoZero_freeFromPool (tTwoZero* const, tMempool* const);
float tTwoZero_tick (tTwoZero* const, float input);
void tTwoZero_setB0 (tTwoZero* const, float b0);
void tTwoZero_setB1 (tTwoZero* const, float b1);
void tTwoZero_setB2 (tTwoZero* const, float b2);
void tTwoZero_setNotch (tTwoZero* const, float frequency, float radius);
void tTwoZero_setCoefficients(tTwoZero* const, float b0, float b1, float b2);
void tTwoZero_setGain (tTwoZero* const, float gain);
//==============================================================================
/* PoleZero filter, reimplemented from STK (Cook and Scavone). */
typedef struct _tPoleZero
{
float gain;
float a0,a1;
float b0,b1;
float lastIn, lastOut;
} _tPoleZero;
typedef _tPoleZero* tPoleZero;
void tPoleZero_init (tPoleZero* const);
void tPoleZero_free (tPoleZero* const);
void tPoleZero_initToPool (tPoleZero* const, tMempool* const);
void tPoleZero_freeFromPool (tPoleZero* const, tMempool* const);
float tPoleZero_tick (tPoleZero* const, float input);
void tPoleZero_setB0 (tPoleZero* const, float b0);
void tPoleZero_setB1 (tPoleZero* const, float b1);
void tPoleZero_setA1 (tPoleZero* const, float a1);
void tPoleZero_setCoefficients (tPoleZero* const, float b0, float b1, float a1);
void tPoleZero_setAllpass (tPoleZero* const, float coeff);
void tPoleZero_setBlockZero (tPoleZero* const, float thePole);
void tPoleZero_setGain (tPoleZero* const, float gain);
//==============================================================================
/* BiQuad filter, reimplemented from STK (Cook and Scavone). */
typedef struct _tBiQuad
{
float gain;
float a0, a1, a2;
float b0, b1, b2;
float lastIn[2];
float lastOut[2];
float frequency, radius;
oBool normalize;
} _tBiQuad;
typedef _tBiQuad* tBiQuad;
void tBiQuad_init (tBiQuad* const);
void tBiQuad_free (tBiQuad* const);
void tBiQuad_initToPool (tBiQuad* const, tMempool* const);
void tBiQuad_freeFromPool (tBiQuad* const, tMempool* const);
float tBiQuad_tick (tBiQuad* const, float input);
void tBiQuad_setB0 (tBiQuad* const, float b0);
void tBiQuad_setB1 (tBiQuad* const, float b1);
void tBiQuad_setB2 (tBiQuad* const, float b2);
void tBiQuad_setA1 (tBiQuad* const, float a1);
void tBiQuad_setA2 (tBiQuad* const, float a2);
void tBiQuad_setNotch (tBiQuad* const, float freq, float radius);
void tBiQuad_setResonance (tBiQuad* const, float freq, float radius, oBool normalize);
void tBiQuad_setCoefficients(tBiQuad* const, float b0, float b1, float b2, float a1, float a2);
void tBiQuad_setGain (tBiQuad* const, float gain);
//==============================================================================
/* State Variable Filter, algorithm from Andy Simper. */
typedef enum SVFType
{
SVFTypeHighpass = 0,
SVFTypeLowpass,
SVFTypeBandpass,
SVFTypeNotch,
SVFTypePeak,
SVFTypeLowShelf,
SVFTypeHighShelf
} SVFType;
typedef struct _tSVF
{
SVFType type;
float cutoff, Q;
float ic1eq,ic2eq;
float g,k,a1,a2,a3,cH,cB,cL,cBK;
} _tSVF;
typedef _tSVF* tSVF;
void tSVF_init (tSVF* const, SVFType type, float freq, float Q);
void tSVF_free (tSVF* const);
void tSVF_initToPool (tSVF* const, SVFType type, float freq, float Q, tMempool* const);
void tSVF_freeFromPool (tSVF* const, tMempool* const);
float tSVF_tick (tSVF* const, float v0);
void tSVF_setFreq (tSVF* const, float freq);
void tSVF_setQ (tSVF* const, float Q);
void tSVF_setFreqAndQ (tSVF* const svff, float freq, float Q);
//==============================================================================
/* Efficient State Variable Filter for 14-bit control input, [0, 4096). */
typedef struct _tEfficientSVF
{
SVFType type;
float cutoff, Q;
float ic1eq,ic2eq;
float g,k,a1,a2,a3;
} _tEfficientSVF;
typedef _tEfficientSVF* tEfficientSVF;
void tEfficientSVF_init (tEfficientSVF* const, SVFType type, uint16_t input, float Q);
void tEfficientSVF_free (tEfficientSVF* const);
void tEfficientSVF_initToPool (tEfficientSVF* const, SVFType type, uint16_t input, float Q, tMempool* const);
void tEfficientSVF_freeFromPool (tEfficientSVF* const, tMempool* const);
float tEfficientSVF_tick (tEfficientSVF* const, float v0);
void tEfficientSVF_setFreq (tEfficientSVF* const, uint16_t controlFreq);
void tEfficientSVF_setQ (tEfficientSVF* const, float Q);
//==============================================================================
/* Simple Highpass filter. */
typedef struct _tHighpass
{
float xs, ys, R;
float frequency;
} _tHighpass;
typedef _tHighpass* tHighpass;
void tHighpass_init (tHighpass* const, float freq);
void tHighpass_free (tHighpass* const);
void tHighpass_initToPool (tHighpass* const, float freq, tMempool* const);
void tHighpass_freeFromPool (tHighpass* const, tMempool* const);
float tHighpass_tick (tHighpass* const, float x);
void tHighpass_setFreq (tHighpass* const, float freq);
float tHighpass_getFreq (tHighpass* const);
//==============================================================================
// Butterworth Filter
#define NUM_SVF_BW 16
typedef struct _tButterworth
{
float gain;
int N;
tSVF low[NUM_SVF_BW];
tSVF high[NUM_SVF_BW];
float f1,f2;
} _tButterworth;
typedef _tButterworth* tButterworth;
void tButterworth_init (tButterworth* const, int N, float f1, float f2);
void tButterworth_free (tButterworth* const);
void tButterworth_initToPool (tButterworth* const, int N, float f1, float f2, tMempool* const);
void tButterworth_freeFromPool (tButterworth* const, tMempool* const);
float tButterworth_tick (tButterworth* const, float input);
void tButterworth_setF1 (tButterworth* const, float in);
void tButterworth_setF2 (tButterworth* const, float in);
void tButterworth_setFreqs (tButterworth* const, float f1, float f2);
//==============================================================================
typedef struct _tFIR
{
float* past;
float* coeff;
int numTaps;
} _tFIR;
typedef _tFIR* tFIR;
void tFIR_init (tFIR* const, float* coeffs, int numTaps);
void tFIR_free (tFIR* const);
void tFIR_initToPool (tFIR* const, float* coeffs, int numTaps, tMempool* const);
void tFIR_freeFromPool (tFIR* const, tMempool* const);
float tFIR_tick (tFIR* const, float input);
//==============================================================================
typedef struct _tMedianFilter
{
float* val;
int* age;
int m;
int size;
int middlePosition;
int last;
int pos;
} _tMedianFilter;
typedef _tMedianFilter* tMedianFilter;
void tMedianFilter_init (tMedianFilter* const, int size);
void tMedianFilter_free (tMedianFilter* const);
void tMedianFilter_initToPool (tMedianFilter* const, int size, tMempool* const);
void tMedianFilter_freeFromPool (tMedianFilter* const, tMempool* const);
float tMedianFilter_tick (tMedianFilter* const, float input);
//Vadim Zavalishin style from VA book (from implementation in RSlib posted to kvr forum)
typedef enum VZFilterType
{
Highpass = 0,
Lowpass,
BandpassSkirt,
BandpassPeak,
BandReject,
Bell,
Lowshelf,
Highshelf,
Morph,
Bypass,
Allpass
} VZFilterType;
typedef struct _tVZFilter
{
VZFilterType type;
// state:
float s1, s2;
// filter coefficients:
float g; // embedded integrator gain
float R2; // twice the damping coefficient (R2 == 2*R == 1/Q)
float h; // factor for feedback (== 1/(1+2*R*g+g*g))
float cL, cB, cH; // coefficients for low-, band-, and highpass signals
// parameters:
float fs; // sample-rate
float fc; // characteristic frequency
float G; // gain
float invG; //1/gain
float B; // bandwidth (in octaves)
float m; // morph parameter (0...1)
float sr; //local sampling rate of filter (may be different from leaf sr if oversampled)
float inv_sr;
} _tVZFilter;
typedef _tVZFilter* tVZFilter;
void tVZFilter_init (tVZFilter* const, VZFilterType type, float freq, float Q);
void tVZFilter_free (tVZFilter* const);
void tVZFilter_initToPool (tVZFilter* const, VZFilterType type, float freq, float Q, tMempool* const);
void tVZFilter_freeFromPool (tVZFilter* const, tMempool* const);
void tVZFilter_setSampleRate (tVZFilter* const, float sampleRate);
float tVZFilter_tick (tVZFilter* const, float input);
void tVZFilter_calcCoeffs (tVZFilter* const);
void tVZFilter_setBandwidth (tVZFilter* const, float bandWidth);
void tVZFilter_setFreq (tVZFilter* const, float freq);
void tVZFilter_setGain (tVZFilter* const, float gain);
void tVZFilter_setType (tVZFilter* const, VZFilterType type);
float tVZFilter_BandwidthToR (tVZFilter* const vf, float B);
//diode ladder filter
typedef struct _tDiodeFilter
{
float f;
float r;
float Vt;
float n;
float gamma;
float zi;
float g0inv;
float g1inv;
float g2inv;
float s0, s1, s2, s3;
} _tDiodeFilter;
typedef _tDiodeFilter* tDiodeFilter;
void tDiodeFilter_init (tDiodeFilter* const, float freq, float Q);
void tDiodeFilter_free (tDiodeFilter* const);
void tDiodeFilter_initToPool (tDiodeFilter* const, float freq, float Q, tMempool* const);
void tDiodeFilter_freeFromPool (tDiodeFilter* const, tMempool* const);
float tDiodeFilter_tick (tDiodeFilter* const, float input);
void tDiodeFilter_setFreq (tDiodeFilter* const vf, float cutoff);
void tDiodeFilter_setQ (tDiodeFilter* const vf, float resonance);
#ifdef __cplusplus
}
#endif
#endif // LEAF_FILTERS_H_INCLUDED
//==============================================================================