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
|
/* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution.
iemlib1 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2005 */
#ifdef NT
#pragma warning( disable : 4244 )
#pragma warning( disable : 4305 )
#endif
#include "m_pd.h"
#include "iemlib.h"
#include <math.h>
#include <stdio.h>
#include <string.h>
/* ------------------------ iem_cot4~ ----------------------------- */
float *iem_cot4_table_cos=(float *)0L;
float *iem_cot4_table_sin=(float *)0L;
static t_class *sigiem_cot4_class;
typedef struct _sigiem_cot4
{
t_object x_obj;
float x_sr;
float x_msi;
} t_sigiem_cot4;
static t_int *sigiem_cot4_perform(t_int *w)
{
t_float *in = (t_float *)(w[1]);
t_float *out = (t_float *)(w[2]);
t_float norm_freq;
t_float hout;
t_sigiem_cot4 *x = (t_sigiem_cot4 *)(w[3]);
t_float sr=x->x_sr;
int n = (int)(w[4]);
float *ctab = iem_cot4_table_cos, *stab = iem_cot4_table_sin;
float *caddr, *saddr, cf1, cf2, sf1, sf2, frac;
double dphase;
int normhipart;
int32 mytfi;
union tabfudge tf;
tf.tf_d = UNITBIT32;
normhipart = tf.tf_i[HIOFFSET];
#if 0 /* this is the readable version of the code. */
while (n--)
{
norm_freq = *in * sr;
if(norm_freq < 0.0001f)
norm_freq = 0.0001f;
else if(norm_freq > 0.9f)
norm_freq = 0.9f;
dphase = (double)(norm_freq * (float)(COSTABSIZE)) + UNITBIT32;
tf.tf_d = dphase;
mytfi = tf.tf_i[HIOFFSET] & (COSTABSIZE-1);
saddr = stab + (mytfi);
caddr = ctab + (mytfi);
tf.tf_i[HIOFFSET] = normhipart;
frac = tf.tf_d - UNITBIT32;
sf1 = saddr[0];
sf2 = saddr[1];
cf1 = caddr[0];
cf2 = caddr[1];
in++;
*out++ = (cf1 + frac * (cf2 - cf1))/(sf1 + frac * (sf2 - sf1));
}
#endif
#if 1 /* this is the same, unwrapped by hand. prolog beg*/
n /= 4;
norm_freq = *in * sr;
if(norm_freq < 0.0001f)
norm_freq = 0.0001f;
else if(norm_freq > 0.9f)
norm_freq = 0.9f;
dphase = (double)(norm_freq * (float)(COSTABSIZE)) + UNITBIT32;
tf.tf_d = dphase;
mytfi = tf.tf_i[HIOFFSET] & (COSTABSIZE-1);
saddr = stab + (mytfi);
caddr = ctab + (mytfi);
tf.tf_i[HIOFFSET] = normhipart;
in += 4; /*prolog end*/
while (--n)
{
norm_freq = *in * sr;
if(norm_freq < 0.0001f)
norm_freq = 0.0001f;
else if(norm_freq > 0.9f)
norm_freq = 0.9f;
dphase = (double)(norm_freq * (float)(COSTABSIZE)) + UNITBIT32;
frac = tf.tf_d - UNITBIT32;
tf.tf_d = dphase;
sf1 = saddr[0];
sf2 = saddr[1];
cf1 = caddr[0];
cf2 = caddr[1];
mytfi = tf.tf_i[HIOFFSET] & (COSTABSIZE-1);
saddr = stab + (mytfi);
caddr = ctab + (mytfi);
hout = (cf1 + frac * (cf2 - cf1))/(sf1 + frac * (sf2 - sf1));
*out++ = hout;
*out++ = hout;
*out++ = hout;
*out++ = hout;
in += 4;
tf.tf_i[HIOFFSET] = normhipart;
}/*epilog beg*/
frac = tf.tf_d - UNITBIT32;
sf1 = saddr[0];
sf2 = saddr[1];
cf1 = caddr[0];
cf2 = caddr[1];
hout = (cf1 + frac * (cf2 - cf1))/(sf1 + frac * (sf2 - sf1));
*out++ = hout;
*out++ = hout;
*out++ = hout;
*out++ = hout;
/*epilog end*/
#endif
return (w+5);
}
static void sigiem_cot4_dsp(t_sigiem_cot4 *x, t_signal **sp)
{
x->x_sr = 2.0f / (float)sp[0]->s_sr;
dsp_add(sigiem_cot4_perform, 4, sp[0]->s_vec, sp[1]->s_vec, x, sp[0]->s_n);
}
static void sigiem_cot4_maketable(void)
{
int i;
float *fp, phase, fff, phsinc = 0.5*3.141592653 / ((float)COSTABSIZE);
union tabfudge tf;
if(!iem_cot4_table_sin)
{
iem_cot4_table_sin = (float *)getbytes(sizeof(float) * (COSTABSIZE+1));
for(i=COSTABSIZE+1, fp=iem_cot4_table_sin, phase=0; i--; fp++, phase+=phsinc)
*fp = sin(phase);
}
if(!iem_cot4_table_cos)
{
iem_cot4_table_cos = (float *)getbytes(sizeof(float) * (COSTABSIZE+1));
for(i=COSTABSIZE+1, fp=iem_cot4_table_cos, phase=0; i--; fp++, phase+=phsinc)
*fp = cos(phase);
}
tf.tf_d = UNITBIT32 + 0.5;
if((unsigned)tf.tf_i[LOWOFFSET] != 0x80000000)
bug("iem_cot4~: unexpected machine alignment");
}
static void *sigiem_cot4_new(void)
{
t_sigiem_cot4 *x = (t_sigiem_cot4 *)pd_new(sigiem_cot4_class);
outlet_new(&x->x_obj, gensym("signal"));
x->x_msi = 0;
return (x);
}
void sigiem_cot4_setup(void)
{
sigiem_cot4_class = class_new(gensym("iem_cot4~"), (t_newmethod)sigiem_cot4_new, 0,
sizeof(t_sigiem_cot4), 0, 0);
class_addcreator((t_newmethod)sigiem_cot4_new, gensym("iem_cot~"), 0);
CLASS_MAINSIGNALIN(sigiem_cot4_class, t_sigiem_cot4, x_msi);
class_addmethod(sigiem_cot4_class, (t_method)sigiem_cot4_dsp, gensym("dsp"), 0);
sigiem_cot4_maketable();
class_sethelpsymbol(sigiem_cot4_class, gensym("iemhelp/help-iem_cot4~"));
}
|
