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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.
*/
/* calculates spectral flatness measure as described by Tae Hong Park*/
#include "m_pd.h"
#include <math.h>
static t_class *sfm_class;
typedef struct _sfm {
t_object x_obj;
t_float f,x;
} t_sfm;
static t_int *sfm_perform(t_int *w)
{
t_sample *in = (t_sample *)(w[1]);
t_sfm *x = (t_sfm *)(w[2]);
t_int N = (t_int)(w[3]),M = (N >> 1) - 1,n;
t_float F, A = 0, G = 1;
t_float iM = 1 / (float)M;
for(n = 0; n < M; n++){
if(in[n] !=0){
G *= in[n];
A += in[n];
}
}
F = 10 * log10(pow(G, iM) / (iM * A));
outlet_float(x->x_obj.ob_outlet, F);
return (w+4);
}
static void sfm_dsp(t_sfm *x, t_signal **sp)
{
dsp_add(sfm_perform, 3,
sp[0]->s_vec, x, sp[0]->s_n);
}
static void *sfm_new(void)
{
t_sfm *x = (t_sfm *)pd_new(sfm_class);
outlet_new(&x->x_obj, &s_float);
return (void *)x;
}
void sfm_tilde_setup(void) {
sfm_class = class_new(gensym("sfm~"),
(t_newmethod)sfm_new,
0, sizeof(t_sfm),
CLASS_DEFAULT,0);
class_addmethod(sfm_class,
(t_method)sfm_dsp, gensym("dsp"), 0);
CLASS_MAINSIGNALIN(sfm_class, t_sfm,f);
class_sethelpsymbol(sfm_class, gensym("help-flib"));
}
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