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
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
|
/*
Copyright (C) 2002 Antoine Rousseau
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "m_pd.h"
#include "math.h"
/* ---------------- tabenv - table envelope computer. ----------------- */
/*------- (in fact it's a mix between env~ and tabplay~)----------------*/
#define MAXOVERLAP 10
#define MAXVSTAKEN 64
typedef struct tabenv
{
/*env part*/
t_object x_obj; /* header */
t_outlet *x_outlet; /* a "float" outlet */
float *x_buf; /* a Hanning window */
int x_phase; /* number of points since last output */
int x_period; /* requested period of output */
int x_realperiod; /* period rounded up to vecsize multiple */
int x_npoints; /* analysis window size in samples */
float x_result; /* result to output */
float x_sumbuf[MAXOVERLAP]; /* summing buffer */
/*tabplay part*/
int x_tabphase;
int x_nsampsintab;
int x_limit;
t_word *x_vec;
t_symbol *x_arrayname;
} t_tabenv;
t_class *tabenv_class;
static void *tabenv_new(t_symbol *s,t_floatarg fnpoints, t_floatarg fperiod)
{
int npoints = fnpoints;
int period = fperiod;
t_tabenv *x;
float *buf;
int i;
if (npoints < 1) npoints = 1024;
if (period < 1) period = npoints/2;
if (period < npoints / MAXOVERLAP + 1)
period = npoints / MAXOVERLAP + 1;
if (!(buf = getbytes(sizeof(float) * (npoints + MAXVSTAKEN))))
{
error("env: couldn't allocate buffer");
return (0);
}
x = (t_tabenv *)pd_new(tabenv_class);
x->x_buf = buf;
x->x_npoints = npoints;
x->x_phase = 0;
x->x_period = period;
for (i = 0; i < MAXOVERLAP; i++) x->x_sumbuf[i] = 0;
for (i = 0; i < npoints; i++)
buf[i] = (1. - cos((2 * 3.14159 * i) / npoints))/npoints;
for (; i < npoints+MAXVSTAKEN; i++) buf[i] = 0;
x->x_outlet = outlet_new(&x->x_obj, gensym("float"));
/* tabplay */
x->x_tabphase = 0x7fffffff;
x->x_limit = 0;
x->x_arrayname = s;
return (x);
}
static void tabenv_perform_64(t_tabenv *x,t_word *in)
{
int n = 64;
int count;
float *sump;
in += n;
for (count = x->x_phase, sump = x->x_sumbuf;
count < x->x_npoints; count += x->x_realperiod, sump++)
{
float *hp = x->x_buf + count;
t_word *fp = in;
float sum = *sump;
int i;
for (i = 0; i < n; i++)
{
fp--;
sum += *hp++ * ((*fp).w_float * (*fp).w_float);
}
*sump = sum;
}
sump[0] = 0;
x->x_phase -= n;
if (x->x_phase < 0)
{
x->x_result = x->x_sumbuf[0];
for (count = x->x_realperiod, sump = x->x_sumbuf;
count < x->x_npoints; count += x->x_realperiod, sump++)
sump[0] = sump[1];
sump[0] = 0;
x->x_phase = x->x_realperiod - n;
outlet_float(x->x_outlet, powtodb(x->x_result));
}
}
static void tabenv_set(t_tabenv *x, t_symbol *s)
{
t_garray *a;
x->x_arrayname = s;
if (!(a = (t_garray *)pd_findbyclass(x->x_arrayname, garray_class)))
{
if (*s->s_name) pd_error(x, "tabenv: %s: no such array",
x->x_arrayname->s_name);
x->x_vec = 0;
}
else if (!garray_getfloatwords(a, &x->x_nsampsintab, &x->x_vec))
{
error("%s: bad template for tabenv", x->x_arrayname->s_name);
x->x_vec = 0;
}
}
static void tabenv_list(t_tabenv *x, t_symbol *s,
int argc, t_atom *argv)
{
long start = atom_getfloatarg(0, argc, argv);
long length = atom_getfloatarg(1, argc, argv);
t_word *limitp, *p;
tabenv_set(x, x->x_arrayname);
if (start < 0) start = 0;
if (length <= 0)
x->x_limit = 0x7fffffff;
else
x->x_limit = start + length;
x->x_tabphase = start;
if(length <= 0) length = x->x_nsampsintab - 1;
if(start >= x->x_nsampsintab) start = x->x_nsampsintab - 1;
if((start + length) >= x->x_nsampsintab)
length = x->x_nsampsintab - 1 - start;
limitp = x->x_vec + start + length - 63;
x->x_realperiod = x->x_period;
for(p = x->x_vec + start; p < limitp ; p += 64)
tabenv_perform_64( x , p );
}
static void tabenv_reset(t_tabenv *x)
{
int i;
x->x_phase = 0;
for (i = 0; i < MAXOVERLAP; i++) x->x_sumbuf[i] = 0;
}
static void tabenv_ff(t_tabenv *x) /* cleanup on free */
{
freebytes(x->x_buf, (x->x_npoints + MAXVSTAKEN) * sizeof(float));
}
void tabenv_setup(void )
{
tabenv_class = class_new(gensym("tabenv"), (t_newmethod)tabenv_new,
(t_method)tabenv_ff, sizeof(t_tabenv), 0, A_DEFSYM, A_DEFFLOAT, A_DEFFLOAT, 0);
class_addmethod(tabenv_class, (t_method)tabenv_reset,
gensym("reset"), 0);
class_addmethod(tabenv_class, (t_method)tabenv_set,
gensym("set"), A_DEFSYM, 0);
class_addlist(tabenv_class, tabenv_list);
}
|
