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/*
* delay.cc
* DIN Is Noise is copyright (c) 2006-2017 Jagannathan Sampath
* For more information, please visit http://dinisnoise.org/
*/
#include "delay.h"
#include "utils.h"
#include <string.h>
#include <stdlib.h>
#include <string>
using namespace std;
void delay::zero () {
nsamples = 0;
samples = 0;
fbk = 0;
vol = 0;
id = 0;
}
delay::delay (float t, const string& fn, const string& vn) :
fbk_fname (fn), vol_fname (vn), fbk_crv (fn), vol_crv (vn)
{
msecs = t;
zero ();
}
void delay::setup () {
fbk_sol (&fbk_crv);
vol_sol (&vol_crv);
fbk_lis (this, &fbk_sol, fbk);
vol_lis (this, &vol_sol, vol);
set (msecs);
}
delay::~delay() {
float* bf [3] = {samples, fbk, vol};
for (int i = 0; i < 3; ++i) if (bf[i]) free (bf[i]);
fbk_crv.save (fbk_fname);
vol_crv.save (vol_fname);
}
void delay::check_buffer () {
static const float thou_1 = 1.0f/1000;
static const int size_of_float = sizeof (float);
extern int SAMPLE_RATE;
int n = (int) (msecs * SAMPLE_RATE * thou_1 + 0.5);
if (n < 1) n = 1;
if (n > nsamples) {
float** nbf[3] = {&samples, &fbk, &vol};
for (int i = 0; i < 3; ++i) {
if (nbf[i]) free (*nbf[i]);
*nbf[i] = (float *) calloc (n, size_of_float);
}
}
nsamples = n;
clamp<int>(0, id, nsamples);
}
void delay::set (float t) {
msecs = t;
check_buffer ();
float dx = 1.0f/(nsamples - 1), x = -dx;
fbk_sol (x, dx, nsamples, fbk);
vol_sol (x, dx, nsamples, vol);
fbk_lis.result = fbk;
vol_lis.result = vol;
}
void delay::get (float& t) {
t = msecs;
}
void delay::operator() (float* out, int n, float fdr) {
float f;
for (int i = 0; i < n; ++i) {
f = out[i] + fbk[id] * samples[id];
out[i] += (fdr * vol[id] * f);
samples[id] = f;
if (++id >= nsamples) id = 0;
}
}