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/* 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_int minmeth;
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 inexp;
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);
inexp = x->f_minmag * 1-(0.1*(log10(boff+i*bin)));
if (minus_two<minus_one && alpha<minus_one && minus_one>x->f_minmag && x->minmeth == 0)
{
SETFLOAT (&store->peaks[npeaks],minus_one);
SETFLOAT (&store->indices[npeaks],i-1);
npeaks++;
}
else if (minus_two<minus_one && alpha<minus_one && minus_one>x->f_minmag && x->minmeth == 0)
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;
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_iexp(t_peakit_tilde *x, t_floatarg f)
{
x->minmeth = f;
}
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;
x->minmeth = 0;
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("|-<>-<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_addmethod(peakit_tilde_class, (t_method)peakit_tilde_iexp, &s_float, A_DEFFLOAT, 0);
CLASS_MAINSIGNALIN(peakit_tilde_class, t_peakit_tilde, f_dummy);
}
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