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Diffstat (limited to 'compressor~.c')
| -rw-r--r-- | compressor~.c | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/compressor~.c b/compressor~.c new file mode 100644 index 0000000..01204f3 --- /dev/null +++ b/compressor~.c @@ -0,0 +1,104 @@ +/* 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_addmethod(compressor_class, (t_method)compressor_dsp, gensym("dsp"), 0); + class_addmethod(compressor_class, (t_method)compressor_strength, gensym("strength"), A_FLOAT, 0); +} |