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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 tristimulus of one frame according to method outlined by Pollard and Jansson. First argument determines method used (x,y, or z) */
#include "flib.h"
static t_class *trist_class;
typedef struct _trist {
t_object x_obj;
t_float f,x;
t_symbol *t;
} t_trist;
static t_int *trist_perform(t_int *w)
{
t_sample *in = (t_sample *)(w[1]);
t_trist *x = (t_trist *)(w[2]);
t_int N = (t_int)(w[3]),M = (N >> 1) - 1,n,i = 0;
t_float T, A = 0,p1 = 0,p2 = 0,p3 = 0,p4 = 0,p5 = 0;
for(n = 0; n < M; n++){
A += in[n];
if (in[n] != 0 && i < 5){
switch(i){
case 4: p5 = in[n]; i++;
break;
case 3: p4 = in[n]; i++;
break;
case 2: p3 = in[n]; i++;
break;
case 1: p2 = in[n]; i++;
break;
case 0: p1 = in[n]; i++;
break;
}
}
}
if (*x->t->s_name == 'z')
T = p1 / A;
else if (*x->t->s_name == 'y')
T = (p2 + p3 + p4) / A;
else
T = (A - p1 + p2 + p3 + p4 + p5) / A;
outlet_float(x->x_obj.ob_outlet, T);
return (w+4);
}
static void trist_dsp(t_trist *x, t_signal **sp)
{
dsp_add(trist_perform, 3,
sp[0]->s_vec, x, sp[0]->s_n);
}
static void *trist_new(t_symbol *s)
{
t_trist *x = (t_trist *)pd_new(trist_class);
x->t = s;
outlet_new(&x->x_obj, &s_float);
return (void *)x;
}
void trist_tilde_setup(void) {
trist_class = class_new(gensym("trist~"),
(t_newmethod)trist_new,
0, sizeof(t_trist),
CLASS_DEFAULT, A_DEFSYMBOL, 0);
class_addmethod(trist_class,
(t_method)trist_dsp, gensym("dsp"), 0);
CLASS_MAINSIGNALIN(trist_class, t_trist,f);
class_sethelpsymbol(trist_class, gensym("help-flib"));
}
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