2 Copyright (C) 2003 Paul Brossier
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 #include "aubio_priv.h"
22 #include "mathutils.h"
23 #include "spectral/fft.h"
24 #include "pitch/pitchyinfft.h"
26 /** pitch yinfft structure */
27 struct _aubio_pitchyinfft_t {
28 fvec_t * win; /**< temporal weighting window */
29 fvec_t * winput; /**< windowed spectrum */
30 cvec_t * res; /**< complex vector to compute square difference function */
31 fvec_t * sqrmag; /**< square difference function */
32 fvec_t * weight; /**< spectral weighting window (psychoacoustic model) */
33 cvec_t * fftout; /**< Fourier transform output */
34 aubio_fft_t * fft; /**< fft object to compute square difference function */
35 fvec_t * yinfft; /**< Yin function */
38 static const smpl_t freqs[] = {0., 20., 25., 31.5, 40., 50., 63., 80., 100.,
39 125., 160., 200., 250., 315., 400., 500., 630., 800., 1000., 1250.,
40 1600., 2000., 2500., 3150., 4000., 5000., 6300., 8000., 9000., 10000.,
41 12500., 15000., 20000., 25100};
43 static const smpl_t weight[] = {-75.8, -70.1, -60.8, -52.1, -44.2, -37.5,
44 -31.3, -25.6, -20.9, -16.5, -12.6, -9.6, -7.0, -4.7, -3.0, -1.8, -0.8,
45 -0.2, -0.0, 0.5, 1.6, 3.2, 5.4, 7.8, 8.1, 5.3, -2.4, -11.1, -12.8,
46 -12.2, -7.4, -17.8, -17.8, -17.8};
48 aubio_pitchyinfft_t * new_aubio_pitchyinfft (uint_t bufsize)
50 aubio_pitchyinfft_t * p = AUBIO_NEW(aubio_pitchyinfft_t);
51 p->winput = new_fvec(bufsize,1);
52 p->fft = new_aubio_fft(bufsize, 1);
53 p->fftout = new_cvec(bufsize,1);
54 p->sqrmag = new_fvec(bufsize,1);
55 p->res = new_cvec(bufsize,1);
56 p->yinfft = new_fvec(bufsize/2+1,1);
57 p->win = new_aubio_window(bufsize, aubio_win_hanningz);
58 p->weight = new_fvec(bufsize/2+1,1);
61 smpl_t freq = 0, a0 = 0, a1 = 0, f0 = 0, f1 = 0;
62 for (i=0; i<p->weight->length; i++) {
63 freq = (smpl_t)i/(smpl_t)bufsize*(smpl_t)44100.;
64 while (freq > freqs[j]) {
71 if (f0 == f1) { // just in case
72 p->weight->data[0][i] = a0;
73 } else if (f0 == 0) { // y = ax+b
74 p->weight->data[0][i] = (a1-a0)/f1*freq + a0;
76 p->weight->data[0][i] = (a1-a0)/(f1-f0)*freq +
77 (a0 - (a1 - a0)/(f1/f0 - 1.));
79 while (freq > freqs[j]) {
82 //AUBIO_DBG("%f\n",p->weight->data[0][i]);
83 p->weight->data[0][i] = DB2LIN(p->weight->data[0][i]);
84 //p->weight->data[0][i] = SQRT(DB2LIN(p->weight->data[0][i]));
90 smpl_t aubio_pitchyinfft_detect(aubio_pitchyinfft_t * p, fvec_t * input, smpl_t tol) {
93 smpl_t tmp = 0, sum = 0;
94 cvec_t * res = (cvec_t *)p->res;
95 fvec_t * yin = (fvec_t *)p->yinfft;
96 for (l=0; l < input->length; l++){
97 p->winput->data[0][l] = p->win->data[0][l] * input->data[0][l];
99 aubio_fft_do(p->fft,p->winput,p->fftout);
100 for (l=0; l < p->fftout->length; l++){
101 p->sqrmag->data[0][l] = SQR(p->fftout->norm[0][l]);
102 p->sqrmag->data[0][l] *= p->weight->data[0][l];
104 for (l=1; l < p->fftout->length; l++){
105 p->sqrmag->data[0][(p->fftout->length-1)*2-l] =
106 SQR(p->fftout->norm[0][l]);
107 p->sqrmag->data[0][(p->fftout->length-1)*2-l] *=
108 p->weight->data[0][l];
110 for (l=0; l < p->sqrmag->length/2+1; l++) {
111 sum += p->sqrmag->data[0][l];
114 aubio_fft_do(p->fft,p->sqrmag,res);
115 yin->data[0][0] = 1.;
116 for (tau=1; tau < yin->length; tau++) {
117 yin->data[0][tau] = sum -
118 res->norm[0][tau]*COS(res->phas[0][tau]);
119 tmp += yin->data[0][tau];
120 yin->data[0][tau] *= tau/tmp;
122 tau = vec_min_elem(yin);
123 if (yin->data[0][tau] < tol) {
124 /* no interpolation */
126 /* 3 point quadratic interpolation */
127 //return vec_quadint_min(yin,tau,1);
128 /* additional check for (unlikely) octave doubling in higher frequencies */
130 return vec_quadint(yin,tau,1);
132 /* should compare the minimum value of each interpolated peaks */
133 halfperiod = FLOOR(tau/2+.5);
134 if (yin->data[0][halfperiod] < tol)
135 return vec_quadint(yin,halfperiod,1);
137 return vec_quadint(yin,tau,1);
143 void del_aubio_pitchyinfft(aubio_pitchyinfft_t *p){
145 del_aubio_fft(p->fft);