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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 the spectral irreg of one frame according to Jensen et al 1999*/
#include "flib.h"
static t_class *irreg_class;
typedef struct _irreg {
t_object x_obj;
t_float f,x;
} t_irreg;
static t_int *irreg_perform(t_int *w)
{
t_sample *in = (t_sample *)(w[1]);
t_irreg *x = (t_irreg *)(w[2]);
t_int N = (t_int)(w[3]),M = N >> 1,n;
t_float I = 0, X = 0,Y = 0;
for(n = 1; n < M; n++){
X += in[n] - in[n+1];
Y += in[n] * in[n];
}
I = X / Y;
outlet_float(x->x_obj.ob_outlet, I);
return (w+4);
}
static void irreg_dsp(t_irreg *x, t_signal **sp)
{
dsp_add(irreg_perform, 3,
sp[0]->s_vec, x, sp[0]->s_n);
}
static void *irreg_new(void)
{
t_irreg *x = (t_irreg *)pd_new(irreg_class);
outlet_new(&x->x_obj, &s_float);
return (void *)x;
}
void irreg_tilde_setup(void) {
irreg_class = class_new(gensym("irreg~"),
(t_newmethod)irreg_new,
0, sizeof(t_irreg),
CLASS_DEFAULT,0);
class_addmethod(irreg_class,
(t_method)irreg_dsp, gensym("dsp"), 0);
CLASS_MAINSIGNALIN(irreg_class, t_irreg,f);
class_sethelpsymbol(irreg_class, gensym("help-flib"));
}
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