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#ifndef WAVEGUIDE_NL_H
#define WAVEGUIDE_NL_H
#include <stdlib.h>
#include <string.h>
typedef struct {
int size;
float *buffer[2];
int ptr;
int delay;
float fc;
float lp[2];
float a1a;
float a1b;
float zm1[2];
} waveguide_nl;
waveguide_nl *waveguide_nl_new(int size, float fc, float da, float db)
{
waveguide_nl *wg = malloc(sizeof(waveguide_nl));
wg->size = size;
wg->delay = size;
wg->buffer[0] = calloc(size, sizeof(float));
wg->buffer[1] = calloc(size, sizeof(float));
wg->ptr = 0;
wg->fc = fc;
wg->lp[0] = 0.0f;
wg->lp[1] = 0.0f;
wg->zm1[0] = 0.0f;
wg->zm1[1] = 0.0f;
wg->a1a = (1.0f - da) / (1.0f + da);
wg->a1b = (1.0f - db) / (1.0f + db);
return wg;
}
inline void waveguide_nl_reset(waveguide_nl *wg)
{
memset(wg->buffer[0], 0, wg->size * sizeof(float));
memset(wg->buffer[1], 0, wg->size * sizeof(float));
wg->lp[0] = 0.0f;
wg->lp[1] = 0.0f;
wg->zm1[0] = 0.0f;
wg->zm1[1] = 0.0f;
}
inline void waveguide_nl_free(waveguide_nl *wg)
{
if (!wg) {
return;
}
free(wg->buffer[0]);
free(wg->buffer[1]);
free(wg);
}
inline void waveguide_nl_set_delay(waveguide_nl *wg, int delay)
{
if (delay > wg->size) {
wg->delay = wg->size;
} else if (delay < 1) {
wg->delay = 1;
} else {
wg->delay = delay;
}
}
inline void waveguide_nl_set_fc(waveguide_nl *wg, float fc)
{
wg->fc = fc;
}
inline void waveguide_nl_set_ap(waveguide_nl *wg, float da, float db)
{
wg->a1a = (1.0f - da) / (1.0f + da);
wg->a1b = (1.0f - db) / (1.0f + db);
}
inline void waveguide_nl_process_lin(waveguide_nl *wg, float in0, float in1, float *out0, float *out1)
{
float tmp;
*out0 = wg->buffer[0][(wg->ptr + wg->delay) % wg->size];
*out0 = wg->lp[0] * (wg->fc - 1.0f) + wg->fc * *out0;
wg->lp[0] = *out0;
tmp = *out0 * -(wg->a1a) + wg->zm1[0];
wg->zm1[0] = tmp * wg->a1a + *out0;
*out0 = tmp;
*out1 = wg->buffer[1][(wg->ptr + wg->delay) % wg->size];
*out1 = wg->lp[1] * (wg->fc - 1.0f) + wg->fc * *out1;
wg->lp[1] = *out1;
tmp = *out1 * -(wg->a1a) + wg->zm1[1];
wg->zm1[1] = tmp * wg->a1a + *out1;
*out1 = tmp;
wg->buffer[0][wg->ptr] = in0;
wg->buffer[1][wg->ptr] = in1;
wg->ptr--;
if (wg->ptr < 0) {
wg->ptr += wg->size;
}
}
inline void waveguide_nl_process(waveguide_nl *wg, float in0, float in1, float *out0, float *out1)
{
float tmp;
float a1;
float b;
*out0 = wg->buffer[0][(wg->ptr + wg->delay) % wg->size];
*out0 = wg->lp[0] * (wg->fc - 1.0f) + wg->fc * *out0;
wg->lp[0] = *out0;
b = (*out0 + 1.0) * 6.0f;
if (b > 1.0f) {
b = 1.0f;
}
if (b < 0.0f) {
b = 0.0f;
}
a1 = b * wg->a1a + (1.0f - b) * wg->a1b;
tmp = *out0 * -a1 + wg->zm1[0];
wg->zm1[0] = tmp * a1 + *out0;
*out0 = tmp;
*out1 = wg->buffer[1][(wg->ptr + wg->delay) % wg->size];
*out1 = wg->lp[1] * (wg->fc - 1.0f) + wg->fc * *out1;
wg->lp[1] = *out1;
b = (*out1 + 1.0) * 6.0f;
if (b > 1.0f) {
b = 1.0f;
}
if (b < 0.0f) {
b = 0.0f;
}
a1 = b * wg->a1a + (1.0f - b) * wg->a1b;
tmp = *out1 * -a1 + wg->zm1[1];
wg->zm1[1] = tmp * a1 + *out1;
*out1 = tmp;
wg->buffer[0][wg->ptr] = in0;
wg->buffer[1][wg->ptr] = in1;
wg->ptr--;
if (wg->ptr < 0) {
wg->ptr += wg->size;
}
}
#endif
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