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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 maximum sample value in each frame*/
#include "flib.h"
static t_class *bmax_class;
typedef struct _bmax {
t_object x_obj;
t_float f,x;
t_int I; /*instances of blockmax to find */
t_outlet *M_out, *I_out;
} t_bmax;
static t_float max(t_float *array, t_int size){
register t_float t = array[0];
register t_int i;
for(i = 1; i < size; i++){
if (t < array[i])
t = array[i];
}
return t;
}
static t_int *bmax_perform(t_int *w)
{
t_sample *in = (t_sample *)(w[1]);
t_bmax *x = (t_bmax *)(w[2]);
t_int N = (t_int)(w[3]);
t_float blockmax;
t_int maxloc[x->I], i, j;
t_atom argv[x->I];
/* argv = getbytes(x->I * sizeof(t_atom)); */
blockmax = max(in,N);
for(i = 0, j = 0; i < N; i++){
if (in[i] == blockmax && j < x->I)
maxloc[j++] = i;
}
if (j < x->I)
for(; j < x->I; maxloc[j++] = 0); /* zero out the rest of the array */
for(i = 0; i < x->I; i++)
SETFLOAT(argv+i, maxloc[i]);
outlet_float(x->M_out, blockmax);
outlet_list(x->I_out, &s_list, x->I, argv);
return (w+5);
}
static void bmax_dsp(t_bmax *x, t_signal **sp)
{
dsp_add(bmax_perform, 4,
sp[0]->s_vec, x, sp[0]->s_n);
}
static void *bmax_new(t_floatarg f)
{
t_bmax *x = (t_bmax *)pd_new(bmax_class);
if (!f)
x->I = 1;
else
x->I = (t_int)floor(f);
x->M_out = outlet_new(&x->x_obj, &s_float);
x->I_out = outlet_new(&x->x_obj, &s_list);
return (void *)x;
}
void bmax_tilde_setup(void) {
bmax_class = class_new(gensym("bmax~"),
(t_newmethod)bmax_new,
0, sizeof(t_bmax),
CLASS_DEFAULT, A_DEFFLOAT, 0);
class_addmethod(bmax_class,
(t_method)bmax_dsp, gensym("dsp"), 0);
CLASS_MAINSIGNALIN(bmax_class, t_bmax,f);
class_sethelpsymbol(bmax_class, gensym("help-flib"));
}
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