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
|
/*
* dirac~: unity sample
*
* (c) 1999-2011 IOhannes m zmölnig, forum::für::umläute, institute of electronic music and acoustics (iem)
*
* optimizations:
* (c) 2005 tim blechmann
*
* 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/>.
*/
/*
* This external makes the two main test-functions available :
* dirac~: will make a single peak (eg: a 1 in all the 0s) at
* a desired position in the signal-vector
* the position can be passed as an argument when creating the object
*
* NOTE : the inlets do NOT specify any times but sample-NUMBERS;
* there are 64 samples in a "standard" signal-vector,
* each "lasting" for 1/44100 secs.
*/
#include "zexy.h"
/* ------------------------ dirac~ ----------------------------- */
static t_class *dirac_class;
typedef struct _dirac {
t_object x_obj;
t_int position;
t_int do_it;
} t_dirac;
static void dirac_bang(t_dirac *x)
{
x->do_it = x->position;
}
static void dirac_float(t_dirac *x, t_float where)
{
x->do_it = x->position = (t_int)where;
}
static t_int *dirac_perform(t_int *w)
{
t_dirac *x = (t_dirac *)(w[1]);
t_sample *out = (t_sample *)(w[2]);
int n = (int)(w[3]);
t_int do_it = x->do_it;
zero_perform(w+1);
if (do_it >= n) {
x->do_it -= n;
} else if(do_it >= 0) {
out[do_it] = 1.f;
x->do_it = -1;
}
return (w+4);
}
#ifndef __WIN32__
/* LATER: investigate the occurence of zero_perf8() */
/* it seems, like pd has the symbol zero_perf8(),
* but it is not exported by m_pd.h:
* so linux can use it, but w32 not
* have to tell miller about that
*/
t_int *zero_perf8(t_int *w);
#else
/* on w32 we have no access to this hidden function anyhow... */
# define zero_perf8 zero_perform
#endif
static t_int *dirac_perf8(t_int *w)
{
t_dirac *x = (t_dirac *)(w[1]);
t_sample *out = (t_sample *)(w[2]);
int n = (int)(w[3]);
t_int do_it = x->do_it;
zero_perf8(w+1);
if (do_it >= n) {
x->do_it -= n;
} else if(do_it >= 0) {
out[do_it] = 1.f;
x->do_it = -1;
}
return (w+4);
}
static void dirac_dsp(t_dirac *x, t_signal **sp)
{
if (sp[0]->s_n & 7) {
dsp_add(dirac_perform, 3, x, sp[0]->s_vec, sp[0]->s_n);
} else {
dsp_add(dirac_perf8, 3, x, sp[0]->s_vec, sp[0]->s_n);
}
}
static void dirac_helper(void)
{
post(""HEARTSYMBOL" dirac~-object :: generates a dirac (unity-pulse)");
post("creation : \"dirac~ [<position>]\" : create a dirac at specified position (in samples)\n"
"inlet\t: <position>\t: create a dirac at new position\n"
"\t 'bang'\t: create a dirac at specified position\n"
"\t 'help'\t: view this\n"
"outlet\t: signal~");
}
static void *dirac_new(t_floatarg where)
{
t_dirac *x = (t_dirac *)pd_new(dirac_class);
outlet_new(&x->x_obj, gensym("signal"));
// x->do_it = where;
x->do_it = -1;
if (where > 0) {
x->position = where;
} else {
x->position = -where;
}
return (x);
}
void dirac_tilde_setup(void)
{
dirac_class = class_new(gensym("dirac~"), (t_newmethod)dirac_new, 0,
sizeof(t_dirac), 0, A_DEFFLOAT, 0);
class_addfloat(dirac_class, dirac_float);
class_addbang(dirac_class, dirac_bang);
class_addmethod(dirac_class, (t_method)dirac_dsp, gensym("dsp"), 0);
class_addmethod(dirac_class, (t_method)dirac_helper, gensym("help"), 0);
zexy_register("dirac~");
}
|
