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
|
/*
* lattice.c - a lattice filter for pd
* Copyright (c) 2000-2003 by Tom Schouten
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "m_pd.h"
#include <math.h>
#define MAXORDER 1024
#define MAXREFCO 0.9999f
typedef struct latticesegment
{
t_float delay; // delay element
t_float rc; // reflection coefficient
} t_latticesegment;
typedef struct latticectl
{
t_latticesegment c_segment[MAXORDER]; // array of lattice segment data
t_int c_segments;
} t_latticectl;
typedef struct lattice
{
t_object x_obj;
t_float x_f;
t_latticectl x_ctl;
} t_lattice;
static t_int *lattice_perform(t_int *w)
{
t_float *in = (float *)(w[3]);
t_float *out = (float *)(w[4]);
t_latticectl *ctl = (t_latticectl *)(w[1]);
t_int i,j;
t_int n = (t_int)(w[2]);
t_float x,rc,d;
t_latticesegment* seg = ctl->c_segment;
t_int segments = ctl->c_segments;
for (i=0; i<n; i++)
{
x = *in++;
// section 0
rc = seg[0].rc;
x += seg[0].delay * rc;
// section 1 to segments-1
for (j=1; j < segments; j++)
{
rc = seg[j].rc;
d = seg[j].delay;
x += d * rc;
seg[j-1].delay = d - rc * x;
}
// stub
seg[segments-1].delay = x;
*out++ = x;
}
return (w+5);
}
static void lattice_dsp(t_lattice *x, t_signal **sp)
{
dsp_add(lattice_perform, 4, &x->x_ctl, sp[0]->s_n, sp[0]->s_vec, sp[1]->s_vec);
}
static void lattice_free(void)
{
}
t_class *lattice_class;
static void lattice_rc(t_lattice *x, t_float segment, t_float refco)
{
t_int seg = (t_float)segment;
if ((seg >= 0) && (seg < x->x_ctl.c_segments)){
if (refco >= MAXREFCO) refco = MAXREFCO;
if (refco <= -MAXREFCO) refco = -MAXREFCO;
x->x_ctl.c_segment[seg].rc = refco;
}
}
static void lattice_reset(t_lattice *x)
{
t_float* buf = (t_float *)x->x_ctl.c_segment;
t_int n = x->x_ctl.c_segments;
t_int i;
for (i=0; i<n; i++) buf[i]=0;
}
static void *lattice_new(t_floatarg segments)
{
t_lattice *x = (t_lattice *)pd_new(lattice_class);
t_int seg = (t_int)segments;
outlet_new(&x->x_obj, gensym("signal"));
if (seg < 1) seg = 1;
if (seg > MAXORDER) seg = MAXORDER;
x->x_ctl.c_segments = seg;
lattice_reset(x);
return (void *)x;
}
void lattice_tilde_setup(void)
{
//post("lattice~ v0.1");
lattice_class = class_new(gensym("lattice~"), (t_newmethod)lattice_new,
(t_method)lattice_free, sizeof(t_lattice), 0, A_DEFFLOAT, 0);
CLASS_MAINSIGNALIN(lattice_class, t_lattice, x_f);
class_addmethod(lattice_class, (t_method)lattice_dsp, gensym("dsp"), 0);
class_addmethod(lattice_class, (t_method)lattice_reset, gensym("reset"), 0);
class_addmethod(lattice_class, (t_method)lattice_rc, gensym("rc"), A_FLOAT, A_FLOAT, 0);
}
|
