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/* ------------------------ formant~ ------------------------------------------ */
/* */
/* Tilde object to produce formant synthesis. */
/* By using several ones, you should be able to generate voice sounds. */
/* Written by Yves Degoyon ( ydegoyon@free.fr ) */
/* */
/* 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. */
/* Also inspired by an article by Jean-Paul Smets - Solanes */
/* */
/* ---------------------------------------------------------------------------- */
#include <sys/types.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/stat.h>
#ifndef MACOSX
#include <malloc.h>
#endif
#include <ctype.h>
#ifdef UNIX
#include <unistd.h>
#endif
#ifdef NT
#define M_PI 3.14159265358979323846
#endif
#include <math.h>
#include <m_pd.h> /* standard pd stuff */
static char *formant_version = "formant~: formant synthesis version 0.1, written by Yves Degoyon";
static t_class *formant_class;
typedef struct _formant
{
t_object x_obj;
t_int x_size; /* size of the sample */
t_float x_central_freq; /* central frequency of the filter */
t_float x_filter_width; /* width of the filter */
t_float x_skirt_width; /* width of the skirt */
t_float x_samplerate; /* sample rate */
t_float x_time_stretch; /* time stretch */
t_int x_readpos; /* data's reading position */
t_int x_play; /* playing on/off flag */
t_outlet *x_end; /* outlet for outputing a bang at the end */
t_float x_gendata; /* flag to avoid reading data during generation ( might be null )*/
t_float* x_data; /* sample containing formant synthesis*/
} t_formant;
/* clean up */
static void formant_free(t_formant *x)
{
if ( x->x_data != NULL ) {
freebytes(x->x_data, x->x_size*sizeof(float) );
x->x_data = NULL;
}
}
/* generate sample data */
static t_int formant_gendata(t_formant *x)
{
t_float t, b, fs;
if ( x->x_size <= 0 || x->x_central_freq <= 0 || x->x_filter_width <= 0 || x->x_skirt_width <= 0 ) {
error( "formant~ : error generating data : negative or null parameter(s)" );
return -1;
}
x->x_gendata = 1;
/* freeing data */
formant_free( x );
if ( !( x->x_data = (float*) getbytes( x->x_size*sizeof(float) ) ) ) {
post( "formant~ : error generating data : cannot allocate table" );
return -1;
}
fs = 0;
while( fs < x->x_size-1 ) {
t = (fs/x->x_samplerate) * x->x_time_stretch; /* time taken from zero */
b = M_PI / x->x_skirt_width ;
if ( t < b ) {
*(x->x_data+(int)fs) = 0.5*(1-cos(x->x_skirt_width*t))*exp(- x->x_filter_width*t )*sin( x->x_central_freq*t);
} else {
*(x->x_data+(int)fs) = exp(- x->x_filter_width*t )*sin( x->x_central_freq*t);
}
fs++;
}
/* everything went fine */
x->x_gendata = 0;
return 0;
}
/* generates a formant */
static t_int *formant_perform(t_int *w)
{
t_formant *x = (t_formant *)(w[1]);
t_float *out = (t_float *)(w[2]);
int n = (int)(w[3]); /* number of samples */
while (n--) {
if ( !x->x_gendata && x->x_play) {
*out=*(x->x_data+x->x_readpos);
x->x_readpos = (x->x_readpos+1)%x->x_size;
if ( x->x_readpos == 0 ) {
x->x_play=0;
outlet_bang(x->x_end);
}
} else {
*out=0.0;
}
out++;
}
return (w+4);
}
static void formant_dsp(t_formant *x, t_signal **sp)
{
dsp_add(formant_perform, 3, x, sp[0]->s_vec, sp[0]->s_n);
}
/* replay the sample */
static void formant_bang(t_formant *x, t_floatarg fsize)
{
x->x_play=1;
x->x_readpos=0;
}
/* set size of the sample */
static void formant_size(t_formant *x, t_floatarg fsize)
{
if ( fsize <= 0 ) {
post( "formant~ : error : sample size should be >0" );
return;
}
x->x_size = fsize;
formant_gendata( x );
}
/* set central frequency of the formant */
static void formant_central_freq(t_formant *x, t_floatarg ffreq)
{
if ( ffreq <= 0 ) {
post( "formant~ : error : filter central frequency should be >0" );
return;
}
x->x_central_freq = ffreq;
formant_gendata( x );
}
/* set filter width of the formant */
static void formant_filter_width(t_formant *x, t_floatarg fwidth)
{
if ( fwidth <= 0 ) {
post( "formant~ : error : filter width should be >0" );
return;
}
x->x_filter_width = fwidth;
formant_gendata( x );
}
/* set skirt width of the formant */
static void formant_skirt_width(t_formant *x, t_floatarg swidth)
{
if ( swidth <= 0 ) {
post( "formant~ : error : skirt width should be >0" );
return;
}
x->x_skirt_width = swidth;
formant_gendata( x );
}
/* set time stretch factor */
static void formant_time_stretch(t_formant *x, t_floatarg fstretch)
{
if ( fstretch <= 0 ) {
post( "formant~ : error : time stretch should be >0" );
return;
}
x->x_time_stretch = fstretch;
formant_gendata( x );
}
static void *formant_new(t_floatarg fsize, t_floatarg ffreq, t_floatarg ffwidth, t_floatarg fswidth)
{
t_formant *x = (t_formant *)pd_new(formant_class);
outlet_new(&x->x_obj, &s_signal);
if ( fsize <= 0 || ffreq <= 0 || ffwidth <= 0 || fswidth <= 0 ) {
error( "formant~ : missing or negative creation arguments" );
return NULL;
}
x->x_size = fsize;
x->x_central_freq = ffreq;
x->x_filter_width = ffwidth;
x->x_skirt_width = fswidth;
x->x_readpos = 0;
x->x_data = NULL;
x->x_time_stretch = 1.0;
x->x_samplerate = sys_getsr();
inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("size"));
inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("freq"));
inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("fwidth"));
inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("swidth"));
inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("stretch"));
x->x_end = outlet_new( &x->x_obj, &s_bang );
if ( formant_gendata( x ) ) {
post( "formant~ : error generating data" );
return NULL;
} else {
return(x);
}
}
void formant_tilde_setup(void)
{
post(formant_version);
formant_class = class_new(gensym("formant~"), (t_newmethod)formant_new, (t_method)formant_free,
sizeof(t_formant), 0, A_DEFFLOAT, A_DEFFLOAT, A_DEFFLOAT, A_DEFFLOAT, 0);
class_sethelpsymbol( formant_class, gensym("help-formant~") );
class_addmethod(formant_class, (t_method)formant_dsp, gensym("dsp"), 0);
class_addmethod(formant_class, (t_method)formant_size, gensym("size"), A_FLOAT, 0);
class_addmethod(formant_class, (t_method)formant_bang, gensym("bang"), 0);
class_addmethod(formant_class, (t_method)formant_central_freq, gensym("freq"), A_FLOAT, 0);
class_addmethod(formant_class, (t_method)formant_filter_width, gensym("fwidth"), A_FLOAT, 0);
class_addmethod(formant_class, (t_method)formant_skirt_width, gensym("swidth"), A_FLOAT, 0);
class_addmethod(formant_class, (t_method)formant_time_stretch, gensym("stretch"), A_FLOAT, 0);
}
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