effect.h

   1 /*
   2
   3     Ann Hell Ex Machina - Music Software
   4     Copyright (C) 2003/2004 Angel Ortega <angel@triptico.com>
   5
   6     This program is free software; you can redistribute it and/or
   7     modify it under the terms of the GNU General Public License
   8     as published by the Free Software Foundation; either version 2
   9     of the License, or (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  19
  20     http://www.triptico.com
  21
  22 */
  23
  24
  25 struct effect
  26 {
  27         float * wave;           /* wave buffer */
  28         double size;            /* buffer (delay) size */
  29         float gain;             /* effect gain */
  30         float igain;            /* gain increment */
  31
  32         double lfo;             /* lfo value */
  33         double lfo_depth;       /* lfo depth */
  34         double lfo_inc;         /* lfo increment */
  35
  36         double cursor;          /* current buffer position */
  37
  38         float (* func)(struct effect *, float); /* processing function */
  39 };
  40
  41 float process_effect(struct effect * e, float input);
  42 void effect_off(struct effect * e);
  43
  44 int effect_delay(struct effect * e, double size);
  45 int effect_echo(struct effect * e, double size, float gain);
  46 int effect_comb(struct effect * e, double size, float gain);
  47 int effect_allpass(struct effect * e, double size, float gain);
  48 int effect_flanger(struct effect * e, double size, float gain,
  49         double depth, double freq, double phase);
  50 int effect_wobble(struct effect * e, double freq, double phase);
  51 int effect_square_wobble(struct effect * e, double freq, double phase);
  52 int effect_fader(struct effect * e, double size, float initial, float final);