1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
/*
* 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%c pdf~\t:: get the probability density function of a signal (-1.0 to +1.0)", HEARTSYMBOL);
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~");
}
|
