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/*
* pdf~: get the ProbabilityDensityFunction of a signal
*
* (c) 1999-2011 IOhannes m zmölnig, forum::für::umläute, institute of electronic music and acoustics (iem)
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include "zexy.h"
/* ------------------------ pdf~ ----------------------------- */
static t_class *pdf_class;
typedef struct _pdf
{
t_object x_obj;
t_float *buf;
int size;
t_float halfsize;
} t_pdf;
static void clear_pdfbuf(t_pdf *x)
{
int n = x->size;
t_float *buf = x->buf;
while (n--) *buf++=0.;
}
static void pdf_bang(t_pdf *x)
{
int n = x->size;
t_float *buf = x->buf, max = 0;
t_atom a[2];
while (n--) if (max < *buf++) max = buf[-1];
n=x->size;
buf = x->buf;
if (max==0.) max=1.;
max = 1./max;
while (n--)
{
SETFLOAT(a, *buf++*max);
SETFLOAT(a+1,x->size-n-1);
outlet_list(x->x_obj.ob_outlet, gensym("list"), 2, (t_atom*)&a);
}
}
static void pdf_float(t_pdf *x, t_floatarg f)
{
if (f) pdf_bang(x); else clear_pdfbuf(x);
}
static t_int *pdf_perform(t_int *w)
{
t_sample *in = (t_sample *)(w[1]);
t_pdf *x = (t_pdf *)(w[2]);
int n = (int)(w[3]);
t_float *buf = x->buf;
t_float halfsize = x->halfsize;
while (n--)
{
t_sample f = *in++;
int iindex = ((f + 1.0) * halfsize)+0.5;
buf[(iindex<0)?0:((iindex>=x->size)?x->size-1:iindex)]+=1.;
}
return (w+4);
}
static void pdf_dsp(t_pdf *x, t_signal **sp)
{
x->halfsize = (x->size - 1) / 2.0;
dsp_add(pdf_perform, 3, sp[0]->s_vec, x, sp[0]->s_n);
}
static void *pdf_new(t_floatarg f)
{
int i = f;
t_pdf *x = (t_pdf *)pd_new(pdf_class);
x->size = (i)?i:64;
x->buf = (t_float *)getbytes(x->size * sizeof(*x->buf));
clear_pdfbuf(x);
outlet_new(&x->x_obj, gensym("list"));
return (x);
}
static void pdf_free(t_pdf *x)
{
if(x->buf)
freebytes(x->buf, x->size*sizeof(*x->buf));
}
static void pdf_tilde_helper(void)
{
post("\n"HEARTSYMBOL" pdf~\t:: get the probability density function of a signal (-1.0 to +1.0)");
post("'bang'\t : output a list of the probabilities of 'n' function values"
"\n'clear'\t : clear the buffer (set all probabilities to zero)"
"\n<1/0>\t : short for 'bang' and 'clear'"
"\n'help'\t : view this");
post("creation :: 'pdf~ [<n>]':: get the pdf for <n> (default: 64) values");
}
void pdf_tilde_setup(void)
{
pdf_class = class_new(gensym("pdf~"), (t_newmethod)pdf_new, (t_method)pdf_free,
sizeof(t_pdf), 0, A_DEFFLOAT, 0);
class_addmethod(pdf_class, nullfn, gensym("signal"), 0);
class_addmethod(pdf_class, (t_method)pdf_dsp, gensym("dsp"), 0);
class_addmethod(pdf_class, (t_method)pdf_bang, gensym("bang"), 0);
class_addmethod(pdf_class, (t_method)clear_pdfbuf, gensym("clear"), 0);
class_addfloat(pdf_class, pdf_float);
class_addmethod(pdf_class, (t_method)pdf_tilde_helper, gensym("help"), 0);
zexy_register("pdf~");
}
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