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
|
/* peakit~ - find frequencies and magnitudes of FFT peaks
* Copyright (C) 2005 Edward Kelly <morph_2016@yahoo.co.uk>
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "m_pd.h"
#include <math.h>
#include <string.h>
static t_class *peakit_tilde_class;
typedef struct _bin_store
{
t_atom peaks[2048];
t_atom indices[2048];
t_atom theta[4096];
t_atom t_prev[4096];
t_atom t_delta[4096];
t_atom peakfreqs[2048];
t_float *f_real, *f_imag;
} t_bin_store;
typedef struct _peakit_tilde
{
t_object x_obj;
t_bin_store x_ctl;
t_outlet *peaks_list, *mags_list;
t_float f_npeaks, f_minmag, f_dummy;
} t_peakit_tilde;
t_int *peakit_tilde_perform(t_int *w)
{
t_peakit_tilde *x = (t_peakit_tilde *)(w[1]);
t_bin_store *store = (t_bin_store *)(w[2]);
t_sample *profile = (t_sample *)(w[3]);
int n = (int)(w[4]);
t_float *real = store->f_real;
t_float *imag = store->f_imag;
int vector = n;
float s_rate = sys_getsr();
float bin = s_rate/n;
float boff = bin/2;
float interp;
float minus_two = 0;
float minus_one = 0;
float alpha = 0;
float peakfreq;
float theta = 0;
float t_prev = 0;
float t_delta;
float pi=M_PI;
float twopi=2*pi;
t_int npeaks = 0;
int i, ndx;
/* find peaks in fourier series */
for (i = 0; i < n; i++)
{
alpha = sqrt(real[i] * real[i] + imag[i] * imag[i]);
theta = atan2(real[i], imag[i]);
t_prev = atom_getfloatarg(i, 16384, store->theta);
SETFLOAT (&store->t_prev[i], t_prev);
SETFLOAT (&store->theta[i], theta);
t_delta = (atom_getfloatarg(i, 16384, store->theta))-(atom_getfloatarg(i, 16384, store->t_prev));
SETFLOAT (&store->t_delta[i], t_delta);
if (minus_two<minus_one && alpha<minus_one && minus_one>(x->f_minmag/1000))
{
SETFLOAT (&store->peaks[npeaks],minus_one);
SETFLOAT (&store->indices[npeaks],i-1);
npeaks++;
}
minus_two = minus_one;
minus_one = alpha;
}
for (i = 0; i < npeaks; i++)
{
ndx = atom_getfloatarg(i, 8192, store->indices);
t_delta = atom_getfloatarg(ndx, 16384, store->t_delta);
theta = atom_getfloatarg(ndx, 8192, store->theta);
t_prev = atom_getfloatarg(ndx, 8192, store->t_prev);
t_delta = (t_delta < -pi) ? (theta+twopi)-t_prev : (t_delta > pi) ? theta-(t_prev+twopi) : t_delta;
// t_delta = (t_delta < -pi) ? (theta+twopi)-t_prev : (t_delta > pi) ? theta-(t_prev+twopi) : t_delta;
peakfreq = (ndx * bin + (boff * (t_delta/pi)));
SETFLOAT (&store->peakfreqs[i], peakfreq);
}
outlet_list(x->mags_list, gensym("list"), (npeaks - 1), store->peaks);
outlet_list(x->peaks_list, gensym("list"), (npeaks - 1), store->peakfreqs);
return(w+5);
}
void *peakit_tilde_dsp(t_peakit_tilde *x, t_signal **sp)
{
x->x_ctl.f_real = sp[0]->s_vec;
x->x_ctl.f_imag = sp[1]->s_vec;
dsp_add(peakit_tilde_perform, 4, x, &x->x_ctl, sp[0]->s_vec, sp[0]->s_n);
return (void *)x;
}
void *peakit_tilde_new(t_floatarg f)
{
t_peakit_tilde *x = (t_peakit_tilde *)pd_new(peakit_tilde_class);
x->f_minmag = f;
memset(x->x_ctl.theta, 0, 8192);
inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);
floatinlet_new(&x->x_obj, &x->f_minmag);
x->peaks_list = outlet_new(&x->x_obj, &s_list);
x->mags_list = outlet_new(&x->x_obj, &s_list);
return (void *)x;
}
void peakit_tilde_setup(void)
{
peakit_tilde_class = class_new(gensym("peakit~"),
(t_newmethod)peakit_tilde_new,
0, sizeof(t_peakit_tilde),
CLASS_DEFAULT, A_DEFFLOAT, 0);
post("|--<>---<>--<peakit~>-<>--<>----<>--|");
post("|--<FFT peaks list>-<>---<>--<>-----|");
post("|---<>-<frequencies and magnitudes>-|");
post("|-<>-<edward>-<kelly>--<>---<2005>--|");
class_sethelpsymbol(peakit_tilde_class, gensym("help-peakit~"));
class_addmethod(peakit_tilde_class, (t_method)peakit_tilde_dsp, gensym("dsp"), 0);
CLASS_MAINSIGNALIN(peakit_tilde_class, t_peakit_tilde, f_dummy);
}
|
