Hash :
df1fa945
Author :
Thomas de Grivel
Date :
2020-02-01T14:48:06
rtbuf signal flanger
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/*
* Copyright 2018,2020 Thomas de Grivel <thoxdg@gmail.com> +33614550127
* Copyright 2018 Judy Najnudel <judy.najnudel@gmail.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <math.h>
#include <stdio.h>
#include <string.h>
#include <strings.h>
#include "rtbuf.h"
#include "rtbuf_signal.h"
int rtbuf_signal_flanger_start (s_rtbuf *rtb)
{
s_rtbuf_signal_flanger_data *data;
assert(rtb->proc->out_bytes == sizeof(*data));
data = (s_rtbuf_signal_flanger_data*) rtb->data;
data->phase = 0;
bzero(data->in, sizeof(data->in));
data->pos = 0;
data->ds = 0;
return 0;
}
int rtbuf_signal_flanger (s_rtbuf *rtb)
{
s_rtbuf_signal_fun in;
s_rtbuf_signal_fun freq;
s_rtbuf_signal_fun amp;
s_rtbuf_signal_fun delay;
s_rtbuf_signal_fun feedback;
s_rtbuf_signal_flanger_data *data;
unsigned int i = 0;
rtbuf_signal_fun(rtb, RTBUF_SIGNAL_FLANGER_IN_SIGNAL, &in);
rtbuf_signal_fun(rtb, RTBUF_SIGNAL_FLANGER_IN_FREQUENCY, &freq);
rtbuf_signal_fun(rtb, RTBUF_SIGNAL_FLANGER_IN_AMPLITUDE, &);
rtbuf_signal_fun(rtb, RTBUF_SIGNAL_FLANGER_IN_DELAY, &delay);
rtbuf_signal_fun(rtb, RTBUF_SIGNAL_FLANGER_IN_FEEDBACK, &feedback);
data = (s_rtbuf_signal_flanger_data*) rtb->data;
while (i < RTBUF_SIGNAL_SAMPLES) {
double s = in.sample_fun(in.signal, i);
double f = freq.sample_fun(freq.signal, i);
double a = amp.sample_fun(amp.signal, i);
double d = delay.sample_fun(delay.signal, i);
double delay;
double fb = feedback.sample_fun(feedback.signal, i);
unsigned int ds;
unsigned int pos;
f = max(0.0, f);
f /= (double) RTBUF_SIGNAL_SAMPLERATE;
data->phase = fmod(data->phase + 2.0 * M_PI * f, 2.0 * M_PI);
delay = a * (sin(data->phase) * 0.5 + 0.5) + d;
ds = max(0.0, min(delay * RTBUF_SIGNAL_SAMPLERATE,
RTBUF_SIGNAL_FLANGER_SAMPLES_MAX));
pos = (data->pos + RTBUF_SIGNAL_FLANGER_SAMPLES_MAX - ds) %
RTBUF_SIGNAL_FLANGER_SAMPLES_MAX;
data->signal[i] = (data->in[pos] + s) / 2.0;
data->in[data->pos++] = (1.0 - fb) * s + fb * data->in[pos];
data->pos %= RTBUF_SIGNAL_FLANGER_SAMPLES_MAX;
i++;
}
return 0;
}