ref: b1c948bece6ebed49f1906e2542edd8e7f05cea0
dir: /src/pitchyinfft.c/
/*
Copyright (C) 2003 Paul Brossier
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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "aubio_priv.h"
#include "sample.h"
#include "mathutils.h"
#include "fft.h"
#include "pitchyinfft.h"
/** pitch yinfft structure */
struct _aubio_pitchyinfft_t {
fvec_t * win; /**< temporal weighting window */
fvec_t * winput; /**< windowed spectrum */
cvec_t * res; /**< complex vector to compute square difference function */
fvec_t * sqrmag; /**< square difference function */
fvec_t * weight; /**< spectral weighting window (psychoacoustic model) */
cvec_t * fftout; /**< Fourier transform output */
aubio_mfft_t * fft; /**< fft object to compute square difference function */
fvec_t * yinfft; /**< Yin function */
};
static const smpl_t freqs[] = {0., 20., 25., 31.5, 40., 50., 63., 80., 100.,
125., 160., 200., 250., 315., 400., 500., 630., 800., 1000., 1250.,
1600., 2000., 2500., 3150., 4000., 5000., 6300., 8000., 9000., 10000.,
12500., 15000., 20000., 25100};
static const smpl_t weight[] = {-75.8, -70.1, -60.8, -52.1, -44.2, -37.5,
-31.3, -25.6, -20.9, -16.5, -12.6, -9.6, -7.0, -4.7, -3.0, -1.8, -0.8,
-0.2, -0.0, 0.5, 1.6, 3.2, 5.4, 7.8, 8.1, 5.3, -2.4, -11.1, -12.8,
-12.2, -7.4, -17.8, -17.8, -17.8};
aubio_pitchyinfft_t * new_aubio_pitchyinfft (uint_t bufsize)
{
aubio_pitchyinfft_t * p = AUBIO_NEW(aubio_pitchyinfft_t);
p->winput = new_fvec(bufsize,1);
p->fft = new_aubio_mfft(bufsize, 1);
p->fftout = new_cvec(bufsize,1);
p->sqrmag = new_fvec(bufsize,1);
p->res = new_cvec(bufsize,1);
p->yinfft = new_fvec(bufsize/2+1,1);
p->win = new_fvec(bufsize,1);
aubio_window(p->win->data[0], bufsize, aubio_win_hanningz);
p->weight = new_fvec(bufsize/2+1,1);
{
uint_t i = 0, j = 1;
smpl_t freq = 0, a0 = 0, a1 = 0, f0 = 0, f1 = 0;
for (i=0; i<p->weight->length; i++) {
freq = (smpl_t)i/(smpl_t)bufsize*(smpl_t)44100.;
while (freq > freqs[j]) {
j +=1;
}
a0 = weight[j-1];
f0 = freqs[j-1];
a1 = weight[j];
f1 = freqs[j];
if (f0 == f1) { // just in case
p->weight->data[0][i] = a0;
} else if (f0 == 0) { // y = ax+b
p->weight->data[0][i] = (a1-a0)/f1*freq + a0;
} else {
p->weight->data[0][i] = (a1-a0)/(f1-f0)*freq +
(a0 - (a1 - a0)/(f1/f0 - 1.));
}
while (freq > freqs[j]) {
j +=1;
}
//AUBIO_DBG("%f\n",p->weight->data[0][i]);
p->weight->data[0][i] = DB2LIN(p->weight->data[0][i]);
//p->weight->data[0][i] = SQRT(DB2LIN(p->weight->data[0][i]));
}
}
return p;
}
smpl_t aubio_pitchyinfft_detect(aubio_pitchyinfft_t * p, fvec_t * input, smpl_t tol) {
uint_t tau, l = 0;
uint_t halfperiod;
smpl_t tmp = 0, sum = 0;
cvec_t * res = (cvec_t *)p->res;
fvec_t * yin = (fvec_t *)p->yinfft;
for (l=0; l < input->length; l++){
p->winput->data[0][l] = p->win->data[0][l] * input->data[0][l];
}
aubio_mfft_do(p->fft,p->winput,p->fftout);
for (l=0; l < p->fftout->length; l++){
p->sqrmag->data[0][l] = SQR(p->fftout->norm[0][l]);
p->sqrmag->data[0][l] *= p->weight->data[0][l];
}
for (l=1; l < p->fftout->length; l++){
p->sqrmag->data[0][(p->fftout->length-1)*2-l] =
SQR(p->fftout->norm[0][l]);
p->sqrmag->data[0][(p->fftout->length-1)*2-l] *=
p->weight->data[0][l];
}
for (l=0; l < p->sqrmag->length/2+1; l++) {
sum += p->sqrmag->data[0][l];
}
sum *= 2.;
aubio_mfft_do(p->fft,p->sqrmag,res);
yin->data[0][0] = 1.;
for (tau=1; tau < yin->length; tau++) {
yin->data[0][tau] = sum -
res->norm[0][tau]*COS(res->phas[0][tau]);
tmp += yin->data[0][tau];
yin->data[0][tau] *= tau/tmp;
}
tau = vec_min_elem(yin);
if (yin->data[0][tau] < tol) {
/* no interpolation */
//return tau;
/* 3 point quadratic interpolation */
//return vec_quadint_min(yin,tau,1);
/* additional check for (unlikely) octave doubling in higher frequencies */
if (tau>35) {
return vec_quadint_min(yin,tau,1);
} else {
/* should compare the minimum value of each interpolated peaks */
halfperiod = FLOOR(tau/2+.5);
if (yin->data[0][halfperiod] < tol)
return vec_quadint_min(yin,halfperiod,1);
else
return vec_quadint_min(yin,tau,1);
}
} else
return 0;
}
void del_aubio_pitchyinfft(aubio_pitchyinfft_t *p){
del_fvec(p->win);
del_aubio_mfft(p->fft);
del_fvec(p->yinfft);
del_fvec(p->sqrmag);
del_cvec(p->res);
del_cvec(p->fftout);
del_fvec(p->winput);
del_fvec(p->weight);
AUBIO_FREE(p);
}