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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, &amp);
  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;
}
rtbuf/rtbuf/rtbuf_signal_flanger.c

Commit

rtbuf_signal_flanger.c
