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/* flib - PD library for feature extraction
Copyright (C) 2005 Jamie Bullock
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.
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/* Compute the magnitude spectrum of a signal given the real and imaginary components of an fft. The output maximum is normalised to 1. If an argument of 2 is given, the power spectrum is output */
#include "flib.h"
#define SQ(a) (a * a)
static t_class *mspec_class;
typedef struct _mspec {
t_object x_obj;
t_float f;
t_int p;
} t_mspec;
static t_int *mspec_perform(t_int *w)
{
t_sample *in1 = (t_sample *)(w[1]);
t_sample *in2 = (t_sample *)(w[2]);
t_sample *out = (t_sample *)(w[3]);
t_int N = (t_int)(w[4]),n;
t_int p = (t_int)(w[5]);
if(p == 2){
for (n = 0; n < N; n++){
if(in1[n] != 0 && in2[n] != 0)
*out++ = (SQ(in1[n]) + SQ(in2[n])) / N;
else
*out++ = 0;
}
}
else{
for (n = 0; n < N; n++){
if(in1[n] != 0 && in2[n] != 0)
*out++ = q8_sqrt(SQ(in1[n]) + SQ(in2[n])) / N;
else
*out++ = 0;
}
}
return (w+6);
}
static void mspec_dsp(t_mspec *x, t_signal **sp)
{
dsp_add(mspec_perform, 5,
sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec, sp[0]->s_n, x->p);
}
static void *mspec_new(t_floatarg f)
{
t_mspec *x = (t_mspec *)pd_new(mspec_class);
if(f == 2)
x->p = 2;
else
x->p = 0;
inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);
outlet_new(&x->x_obj, &s_signal);
return (void *)x;
}
void mspec_tilde_setup(void) {
mspec_class = class_new(gensym("mspec~"),
(t_newmethod)mspec_new,
0, sizeof(t_mspec),
CLASS_DEFAULT, A_DEFFLOAT, 0);
class_addmethod(mspec_class,
(t_method)mspec_dsp, gensym("dsp"), 0);
CLASS_MAINSIGNALIN(mspec_class, t_mspec,f);
class_sethelpsymbol(mspec_class, gensym("help-flib"));
}
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