rtbuf/rtbuf/rtbuf_dynamic_limiter.c

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• Hash : 928ec56d
  Author : Thomas de Grivel
  Date : 2019-02-03T10:04:30
  

  moved default values into libraries
  

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• rtbuf_dynamic_limiter.c

• /*
   * Copyright 2019 Thomas de Grivel <thoxdg@gmail.com> +33614550127
   * Copyright 2019 Judy Najnudel
   *
   * 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 "rtbuf.h"
  #include "rtbuf_dynamic.h"
  
  int rtbuf_dynamic_limiter (s_rtbuf *rtb)
  {
    s_rtbuf_signal_fun in_;
    s_rtbuf_signal_fun g_;
    s_rtbuf_signal_fun t_;
    s_rtbuf_signal_fun a_;
    s_rtbuf_signal_fun r_;
    s_rtbuf_dynamic_limiter_data *data;
    unsigned int i = 0;
    assert(rtb);
    assert(rtb->proc);
    assert(rtb->data);
    rtbuf_signal_fun(rtb, RTBUF_DYNAMIC_LIMITER_IN_SIGNAL  , &in_);
    rtbuf_signal_fun(rtb, RTBUF_DYNAMIC_LIMITER_IN_GAIN    , &g_);
    rtbuf_signal_fun(rtb, RTBUF_DYNAMIC_LIMITER_IN_TRESHOLD, &t_);
    rtbuf_signal_fun(rtb, RTBUF_DYNAMIC_LIMITER_IN_ATTACK  , &a_);
    rtbuf_signal_fun(rtb, RTBUF_DYNAMIC_LIMITER_IN_RELEASE , &r_);
    data = (s_rtbuf_dynamic_limiter_data*) rtb->data;
    while (i < RTBUF_SIGNAL_SAMPLES) {
      double in = in_.sample_fun(in_.signal, i);
      double g = max(0.0, g_.sample_fun(g_.signal, i));
      double t = max(0.0, t_.sample_fun(t_.signal, i));
      double a = max(0.0, a_.sample_fun(a_.signal, i));
      double r = max(0.0, r_.sample_fun(r_.signal, i));
      double in_g = in * g;
      double s = in_g * data->ratio;
      if (s < t)
              if (data->ratio < 1.0) {
                      data->ratio += 1.0 / (r * RTBUF_SIGNAL_SAMPLERATE);
                      if (data->ratio > 1.0)
                              data->ratio = 1.0;
              }
      if (s >= t) {
              data->ratio -= 1.0 / (a * RTBUF_SIGNAL_SAMPLERATE);
              if (data->ratio < 0.0)
                      data->ratio = 0;
      }
      data->signal[i] = in_g * data->ratio;
      i++;
    }
    return 0;
  }
  
  int rtbuf_dynamic_limiter_start (s_rtbuf *rtb)
  {
    s_rtbuf_dynamic_limiter_data *data;
    assert(rtb);
    assert(rtb->proc);
    assert(rtb->data);
    assert(rtb->proc->out_bytes == sizeof(*data));
    data = (s_rtbuf_dynamic_limiter_data*) rtb->data;
    data->signal[RTBUF_SIGNAL_SAMPLES - 1] = 0.0;
    data->ratio = 1.0;
    return 0;
  }
  

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