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
|
/* vocoder~ -- vocoder effect inspired by xvox
* written by Simon Morlat ( http://simon.morlat.free.fr )
*
* Copyleft 2001 Yves Degoyon.
* Permission is granted to use this software for any purpose provided you
* keep this copyright notice intact.
*
* THE AUTHOR AND HIS EXPLOITERS MAKE NO WARRANTY, EXPRESS OR IMPLIED,
* IN CONNECTION WITH THIS SOFTWARE.
*
*/
#include "m_pd.h"
#include "filters.h"
#include "lpc.h"
#define OUTPUT_DELAY 50
typedef struct _vocoder
{
t_object x_obj;
t_float x_f;
t_float x_cutoff;
t_int x_vfeedback;
double *x_in1buf;
double *x_in2buf;
double *x_outbuf;
t_int x_blocksize;
t_int x_process;
} t_vocoder;
static t_class *vocoder_class;
static char *vocoder_version = "vocoder~: version 0.1, written by ydegoyon@free.fr, inspired by xvox (Simon Morlat)";
static void vocoder_cutoff(t_vocoder *x, t_floatarg fcutoff )
{
if ( fcutoff > 128.0 )
{
fcutoff = 128.0;
}
if ( fcutoff < 0.0 )
{
fcutoff = 0.0;
}
x->x_cutoff = fcutoff;
}
static void vocoder_vfeedback(t_vocoder *x, t_floatarg fvfeedback )
{
if ( fvfeedback > 100.0 )
{
fvfeedback = 100.0;
}
if ( fvfeedback < 0.0 )
{
fvfeedback = 0.0;
}
x->x_vfeedback = fvfeedback;
}
static t_int *vocoder_perform(t_int *w)
{
t_vocoder *x = (t_vocoder *)(w[1]);
t_float *in1 = (t_float *)(w[2]);
t_float *fin1 = (t_float *)(w[2]);
t_float *in2 = (t_float *)(w[3]);
t_float *out1 = (t_float *)(w[4]);
double correls[12], lpc_coef[11], f1[12], f2[12], lsp_coef[11];
int offset=0;
int n = (int)(w[5]), i;
if ( !x->x_process ) return (w+6);
if ( x->x_blocksize != n )
{
if ( x->x_in1buf ) freebytes( x->x_in1buf, 3*x->x_blocksize/2*sizeof( double ) );
if ( x->x_in2buf ) freebytes( x->x_in2buf, 3*x->x_blocksize/2*sizeof( double ) );
if ( x->x_outbuf ) freebytes( x->x_outbuf, (x->x_blocksize+OUTPUT_DELAY)*sizeof( double ) );
x->x_blocksize = n;
x->x_in1buf = (double*) getbytes( 3*x->x_blocksize/2*sizeof( double ) );
x->x_in2buf = (double*) getbytes( 3*x->x_blocksize/2*sizeof( double ) );
x->x_outbuf = (double*) getbytes( (x->x_blocksize+OUTPUT_DELAY)*sizeof( double ) );
if ( !x->x_in1buf || !x->x_in2buf || !x->x_outbuf )
{
post( "vocoder~ : allocations failed : stop processing" );
x->x_process = 0;
}
}
for(i=0;i<x->x_blocksize/2;i++)
{
x->x_in1buf[i]=x->x_in1buf[i+x->x_blocksize];
};
for(i=0;i<OUTPUT_DELAY;i++) x->x_outbuf[i]=x->x_outbuf[i+x->x_blocksize];
for(i=0;i<x->x_blocksize;i++)
{
x->x_in1buf[x->x_blocksize/2+i]=(double)(*(in1++));
x->x_in2buf[x->x_blocksize/2+i]=(double)(*(in2++));
}
hp_filter(x->x_in2buf,x->x_cutoff/128.,n);
for(i=0;i<4;i++)
{
comp_lpc(x->x_in1buf+offset,correls,lpc_coef,x->x_blocksize/4);
if (lpc_coef[0]!=0)
{
lpc2lsp(lpc_coef,f1,f2,lsp_coef);
lsp2lpc(lsp_coef,lpc_coef);
};
lpc_filter(x->x_in2buf+offset,lpc_coef,x->x_outbuf+OUTPUT_DELAY+offset,x->x_blocksize/4);
offset+=x->x_blocksize/4;
};
for(i=0;i<x->x_blocksize;i++)
{
if ( x->x_outbuf[OUTPUT_DELAY+i] > 1.0 ) x->x_outbuf[OUTPUT_DELAY+i]=1.0;
if ( x->x_outbuf[OUTPUT_DELAY+i] < -1.0 ) x->x_outbuf[OUTPUT_DELAY+i]=-1.0;
*(out1++)=(t_float)(((100-x->x_vfeedback)*x->x_outbuf[OUTPUT_DELAY+i]
+ x->x_vfeedback*(*fin1++))/100.0);
};
return (w+6);
}
static void vocoder_dsp(t_vocoder *x, t_signal **sp)
{
dsp_add(vocoder_perform, 5, x, sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec, sp[0]->s_n);
}
static void *vocoder_new(void)
{
t_vocoder *x = (t_vocoder *)pd_new(vocoder_class);
inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);
inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("cutoff"));
inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("vfeedback"));
outlet_new(&x->x_obj, &s_signal);
x->x_cutoff = 60.;
x->x_vfeedback = 50;
x->x_blocksize=-1;
x->x_in1buf = NULL;
x->x_in2buf = NULL;
x->x_outbuf = NULL;
x->x_process = 1;
return (x);
}
/* clean up */
static void vocoder_free(t_vocoder *x)
{
if ( x->x_in1buf ) freebytes( x->x_in1buf, 3*x->x_blocksize/2*sizeof( double ) );
if ( x->x_in2buf ) freebytes( x->x_in2buf, 3*x->x_blocksize/2*sizeof( double ) );
if ( x->x_outbuf ) freebytes( x->x_outbuf, (x->x_blocksize+OUTPUT_DELAY)*sizeof( double ) );
}
void vocoder_tilde_setup(void)
{
post(vocoder_version);
vocoder_class = class_new(gensym("vocoder~"), (t_newmethod)vocoder_new, (t_method)vocoder_free,
sizeof(t_vocoder), 0, 0);
CLASS_MAINSIGNALIN( vocoder_class, t_vocoder, x_f );
class_addmethod(vocoder_class, (t_method)vocoder_dsp, gensym("dsp"), 0);
class_addmethod(vocoder_class, (t_method)vocoder_cutoff, gensym("cutoff"), A_FLOAT, 0);
class_addmethod(vocoder_class, (t_method)vocoder_vfeedback, gensym("vfeedback"), A_FLOAT, 0);
}
|
