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
196
197
198
199
200
201
202
|
// GPL
// most of this code comes from pd. just the interpolation shematic is diferent.
#include "m_pd.h"
/******************** tabosc4c~ ***********************/
/* this is all copied from d_osc.c... what include file could this go in? */
#define UNITBIT32 1572864. /* 3*2^19; bit 32 has place value 1 */
/* machine-dependent definitions. These ifdefs really
should have been by CPU type and not by operating system! */
#ifdef IRIX
/* big-endian. Most significant byte is at low address in memory */
#define HIOFFSET 0 /* word offset to find MSB */
#define LOWOFFSET 1 /* word offset to find LSB */
#define int32 long /* a data type that has 32 bits */
#endif /* IRIX */
#ifdef MSW
/* little-endian; most significant byte is at highest address */
#define HIOFFSET 1
#define LOWOFFSET 0
#define int32 long
#endif
#if defined(__FreeBSD__) || defined(__APPLE__)
#include <machine/endian.h>
#endif
#ifdef __linux__
#include <endian.h>
#endif
#if defined(__unix__) || defined(__APPLE__)
#if !defined(BYTE_ORDER) || !defined(LITTLE_ENDIAN)
#error No byte order defined
#endif
#if BYTE_ORDER == LITTLE_ENDIAN
#define HIOFFSET 1
#define LOWOFFSET 0
#else
#define HIOFFSET 0 /* word offset to find MSB */
#define LOWOFFSET 1 /* word offset to find LSB */
#endif /* __BYTE_ORDER */
#include <sys/types.h>
#define int32 int32_t
#endif /* __unix__ or __APPLE__*/
union tabfudge
{
double tf_d;
int32 tf_i[2];
};
static t_class *tabosc4c_tilde_class;
typedef struct _tabosc4c_tilde
{
t_object x_obj;
t_float x_fnpoints;
t_float x_finvnpoints;
t_word *x_vec;
t_symbol *x_arrayname;
t_float x_f;
double x_phase;
t_float x_conv;
} t_tabosc4c_tilde;
static void *tabosc4c_tilde_new(t_symbol *s)
{
t_tabosc4c_tilde *x = (t_tabosc4c_tilde *)pd_new(tabosc4c_tilde_class);
x->x_arrayname = s;
x->x_vec = 0;
x->x_fnpoints = 512.;
x->x_finvnpoints = (1./512.);
outlet_new(&x->x_obj, gensym("signal"));
inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft1"));
x->x_f = 0;
return (x);
}
static t_int *tabosc4c_tilde_perform(t_int *w)
{
t_tabosc4c_tilde *x = (t_tabosc4c_tilde *)(w[1]);
t_sample *in = (t_sample *)(w[2]);
t_sample *out = (t_sample *)(w[3]);
int n = (int)(w[4]);
int normhipart;
union tabfudge tf;
double a0,a1,a2; // CH
t_float fnpoints = x->x_fnpoints;
int mask = fnpoints - 1;
t_float conv = fnpoints * x->x_conv;
int maxindex;
t_word *tab = x->x_vec, *addr;
int i;
double dphase = fnpoints * x->x_phase + UNITBIT32;
if (!tab) goto zero;
tf.tf_d = UNITBIT32;
normhipart = tf.tf_i[HIOFFSET];
#if 1
while (n--)
{
t_sample frac, a, b, c, d, cminusb;
tf.tf_d = dphase;
dphase += *in++ * conv;
addr = tab + (tf.tf_i[HIOFFSET] & mask);
tf.tf_i[HIOFFSET] = normhipart;
frac = tf.tf_d - UNITBIT32;
a = addr[0].w_float;
b = addr[1].w_float;
c = addr[2].w_float;
d = addr[3].w_float;
// cminusb = c-b;
// *out++ = b + frac * (
// cminusb - 0.1666667f * (1.-frac) * (
// (d - a - 3.0f * cminusb) * frac + (d + 2.0f*a - 3.0f*b) ) );
// CH
a0 = d - c - a + b;
a1 = a - b - a0;
a2 = c - a;
*out++ = ((a0*frac+a1)*frac+a2)*frac+b;
}
#endif
tf.tf_d = UNITBIT32 * fnpoints;
normhipart = tf.tf_i[HIOFFSET];
tf.tf_d = dphase + (UNITBIT32 * fnpoints - UNITBIT32);
tf.tf_i[HIOFFSET] = normhipart;
x->x_phase = (tf.tf_d - UNITBIT32 * fnpoints) * x->x_finvnpoints;
return (w+5);
zero:
while (n--) *out++ = 0;
return (w+5);
}
void tabosc4c_tilde_set(t_tabosc4c_tilde *x, t_symbol *s)
{
t_garray *a;
int npoints, pointsinarray;
x->x_arrayname = s;
if (!(a = (t_garray *)pd_findbyclass(x->x_arrayname, garray_class)))
{
if (*s->s_name)
pd_error(x, "tabosc4c~: %s: no such array", x->x_arrayname->s_name);
x->x_vec = 0;
}
else if (!garray_getfloatwords(a, &pointsinarray, &x->x_vec))
{
pd_error(x, "%s: bad template for tabosc4c~", x->x_arrayname->s_name);
x->x_vec = 0;
}
else if ((npoints = pointsinarray - 3) != (1 << ilog2(pointsinarray - 3)))
{
pd_error(x, "%s: number of points (%d) not a power of 2 plus three",
x->x_arrayname->s_name, pointsinarray);
x->x_vec = 0;
garray_usedindsp(a);
}
else
{
x->x_fnpoints = npoints;
x->x_finvnpoints = 1./npoints;
garray_usedindsp(a);
}
}
static void tabosc4c_tilde_ft1(t_tabosc4c_tilde *x, t_float f)
{
x->x_phase = f;
}
static void tabosc4c_tilde_dsp(t_tabosc4c_tilde *x, t_signal **sp)
{
x->x_conv = 1. / sp[0]->s_sr;
tabosc4c_tilde_set(x, x->x_arrayname);
dsp_add(tabosc4c_tilde_perform, 4, x,
sp[0]->s_vec, sp[1]->s_vec, sp[0]->s_n);
}
void tabosc4c_tilde_setup(void)
{
tabosc4c_tilde_class = class_new(gensym("tabosc4c~"),
(t_newmethod)tabosc4c_tilde_new, 0,
sizeof(t_tabosc4c_tilde), 0, A_DEFSYM, 0);
CLASS_MAINSIGNALIN(tabosc4c_tilde_class, t_tabosc4c_tilde, x_f);
class_addmethod(tabosc4c_tilde_class, (t_method)tabosc4c_tilde_dsp,
gensym("dsp"), 0);
class_addmethod(tabosc4c_tilde_class, (t_method)tabosc4c_tilde_set,
gensym("set"), A_SYMBOL, 0);
class_addmethod(tabosc4c_tilde_class, (t_method)tabosc4c_tilde_ft1,
gensym("ft1"), A_FLOAT, 0);
}
|
