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/*
* guttersynth.h
* Part of libguttersynth
*
* Copyright Tom Mudd 2019, Richard Knight 2021, 2022
*
* Ported to C by Richard Knight
* from https://github.com/tommmmudd/guttersynthesis by Tom Mudd
*
*/
#ifndef GUTTER_H
#define GUTTER_H
#ifdef __cplusplus
extern "C" {
#endif
#include <stdio.h>
#include <stdlib.h>
// support for either single or double precision
#ifndef FLT
#ifdef USE_FLOAT
#define FLT float
#else
#define FLT double
#endif
#endif
// internal/private dcblock state variables
typedef struct dcblock_session_ {
FLT xm1;
FLT ym1;
FLT r;
} dcblock_session;
// internal/private state variables
typedef struct gutter_internal_ {
void (*dealloc)(void*);
int samplerate;
FLT finalY;
FLT duffX;
FLT duffY;
FLT dx;
FLT dy;
FLT t;
FLT* prevX1;
FLT* prevX2;
FLT* prevY1;
FLT* prevY2;
FLT* V;
FLT* K;
FLT* norm;
FLT* a0;
FLT* a1;
FLT* a2;
FLT* b1;
FLT* b2;
FLT* y;
dcblock_session dcblock;
} gutter_internal;
// state with public variables
typedef struct gutter_state_ {
int bankCount;
int filterCount;
FLT gamma;
FLT omega;
FLT c;
FLT dt;
FLT singleGain;
FLT* gains;
FLT* filterFreqs;
FLT* Q;
int enableAudioInput;
int filtersOn;
int smoothing;
int distortionMethod;
gutter_internal gi;
} gutter_state;
// synthesise single sample with input
FLT gutter_process_input(gutter_state* s, FLT audioInput);
// synthesise single sample
FLT gutter_process(gutter_state* s);
// synthesise specified number of samples with input
void gutter_process_input_samples(gutter_state* s, FLT* audioInput, FLT* audioOutput, int nsamps);
// synthesise specified number of samples
void gutter_process_samples(gutter_state* s, FLT* audioOutput, int nsamps);
// reset state
void gutter_reset(gutter_state* s);
// clean up memory etc
void gutter_cleanup(gutter_state* s);
// calculate filter coefficients
void gutter_calccoeffs(gutter_state* s);
// initialise with custom memory allocator and deallocator
gutter_state* gutter_init_ca(int bankCount, int filterCount, int samplerate,
void* (*allocator)(size_t), void (*deallocator)(void*));
// initialise with standard malloc and free
gutter_state* gutter_init(int bankCount, int filterCount, int samplerate);
// randomise filters
void gutter_randomisefilters(gutter_state* s);
// set distortion method
int gutter_setdistortionmethod(gutter_state* s, int method);
// set frequency of a filter in a bank
int gutter_setfreq(gutter_state*, int bank, int filter, FLT value);
// set Q of a filter in a bank
int gutter_setq(gutter_state* s, int bank, int filter, FLT value);
// set gain of a filter in a bank
int gutter_setgain(gutter_state* s, int bank, int filter, FLT value);
// set Q of all filters
void gutter_setqall(gutter_state* s, FLT value);
#ifdef __cplusplus
}
#endif
#endif /* GUTTER_H */
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