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/* Copyright (c) 2002 Yves Degoyon. */
/* For information on usage and redistribution, and for a DISCLAIMER OF ALL */
/* WARRANTIES, see the file, "LICENSE.txt," in this distribution. */
/* */
/* compressor~ -- compresses audio signal according to a factor */
/* */
/* This program is free software; you can redistribute it and/or */
/* modify it under the terms of the GNU General Public License */
/* as published by the Free Software Foundation; either version 2 */
/* of the License, or (at your option) any later version. */
/* */
/* See file LICENSE for further informations on licensing terms. */
/* */
/* This program is distributed in the hope that it will be useful, */
/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
/* GNU General Public License for more details. */
/* */
/* You should have received a copy of the GNU General Public License */
/* along with this program; if not, write to the Free Software */
/* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* */
/* Based on PureData by Miller Puckette and others. */
/* */
/* Made while listening to : */
/* */
/* "I can't get you out of my head" */
/* "Na, na, na, na, na, na, na, na, na, ...." */
/* Kylie Minogue ( without Nick Cave ) */
/* ---------------------------------------------------------------------------- */
#include "m_pd.h"
#include <stdlib.h>
#include <math.h>
static char *compressor_version = "compressor~: an audio compressor, version 0.1 (ydegoyon@free.fr)";
typedef struct _compressor
{
t_object x_obj;
t_float x_strength;
t_float x_pifactor;
t_float x_f;
} t_compressor;
static t_class *compressor_class;
static void compressor_strength(t_compressor *x, t_floatarg fstrength )
{
if (fstrength < -1.0)
{
x->x_strength = -1.0;
}
else if (fstrength > 5)
{
x->x_strength = 5;
}
else
{
x->x_strength = fstrength;
}
x->x_pifactor = pow( M_PI, x->x_strength );
}
static void *compressor_new(void)
{
t_compressor *x = (t_compressor *)pd_new(compressor_class);
inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("strength"));
x->x_strength = 0.;
x->x_pifactor = pow( M_PI, x->x_strength );
outlet_new(&x->x_obj, &s_signal);
return (x);
}
static t_int *compressor_perform(t_int *w)
{
t_float *in = (t_float *)(w[1]);
t_float *out = (t_float *)(w[2]);
int n = (int)(w[3]);
t_compressor *x = (t_compressor*)(w[4]);
t_float isample_fact = x->x_pifactor;
t_float osample_fact = 2.0 / M_PI;
while (n--) {
*out = atan (*in * isample_fact) * osample_fact;
out++; in++;
}
return (w+5);
}
static void compressor_dsp(t_compressor *x, t_signal **sp)
{
dsp_add(compressor_perform, 4, sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n, x );
}
void compressor_tilde_setup(void)
{
post( compressor_version );
compressor_class = class_new(gensym("compressor~"), (t_newmethod)compressor_new, 0,
sizeof(t_compressor), 0, 0);
CLASS_MAINSIGNALIN( compressor_class, t_compressor, x_f );
class_sethelpsymbol( compressor_class, gensym("help-compressor~.pd") );
class_addmethod(compressor_class, (t_method)compressor_dsp, gensym("dsp"), 0);
class_addmethod(compressor_class, (t_method)compressor_strength, gensym("strength"), A_FLOAT, 0);
}
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