2 Copyright (C) 2003-2009 Paul Brossier <piem@aubio.org>
4 This file is part of aubio.
6 aubio is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 aubio is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with aubio. If not, see <http://www.gnu.org/licenses/>.
21 #include "aubio_priv.h"
24 #include "mathutils.h"
25 #include "spectral/fft.h"
26 #include "pitch/pitchyinfft.h"
28 /** pitch yinfft structure */
29 struct _aubio_pitchyinfft_t
31 fvec_t *win; /**< temporal weighting window */
32 fvec_t *winput; /**< windowed spectrum */
33 cvec_t *res; /**< complex vector to compute square difference function */
34 fvec_t *sqrmag; /**< square difference function */
35 fvec_t *weight; /**< spectral weighting window (psychoacoustic model) */
36 cvec_t *fftout; /**< Fourier transform output */
37 aubio_fft_t *fft; /**< fft object to compute square difference function */
38 fvec_t *yinfft; /**< Yin function */
39 smpl_t tol; /**< Yin tolerance */
42 static const smpl_t freqs[] = { 0., 20., 25., 31.5, 40., 50., 63., 80., 100.,
43 125., 160., 200., 250., 315., 400., 500., 630., 800., 1000., 1250.,
44 1600., 2000., 2500., 3150., 4000., 5000., 6300., 8000., 9000., 10000.,
45 12500., 15000., 20000., 25100
48 static const smpl_t weight[] = { -75.8, -70.1, -60.8, -52.1, -44.2, -37.5,
49 -31.3, -25.6, -20.9, -16.5, -12.6, -9.6, -7.0, -4.7, -3.0, -1.8, -0.8,
50 -0.2, -0.0, 0.5, 1.6, 3.2, 5.4, 7.8, 8.1, 5.3, -2.4, -11.1, -12.8,
51 -12.2, -7.4, -17.8, -17.8, -17.8
55 new_aubio_pitchyinfft (uint_t bufsize)
57 aubio_pitchyinfft_t *p = AUBIO_NEW (aubio_pitchyinfft_t);
58 p->winput = new_fvec (bufsize);
59 p->fft = new_aubio_fft (bufsize);
60 p->fftout = new_cvec (bufsize);
61 p->sqrmag = new_fvec (bufsize);
62 p->res = new_cvec (bufsize);
63 p->yinfft = new_fvec (bufsize / 2 + 1);
65 p->win = new_aubio_window ("hanningz", bufsize);
66 p->weight = new_fvec (bufsize / 2 + 1);
68 smpl_t freq = 0, a0 = 0, a1 = 0, f0 = 0, f1 = 0;
69 for (i = 0; i < p->weight->length; i++) {
70 freq = (smpl_t) i / (smpl_t) bufsize *(smpl_t) 44100.;
71 while (freq > freqs[j]) {
78 if (f0 == f1) { // just in case
79 p->weight->data[i] = a0;
80 } else if (f0 == 0) { // y = ax+b
81 p->weight->data[i] = (a1 - a0) / f1 * freq + a0;
83 p->weight->data[i] = (a1 - a0) / (f1 - f0) * freq +
84 (a0 - (a1 - a0) / (f1 / f0 - 1.));
86 while (freq > freqs[j]) {
89 //AUBIO_DBG("%f\n",p->weight->data[i]);
90 p->weight->data[i] = DB2LIN (p->weight->data[i]);
91 //p->weight->data[i] = SQRT(DB2LIN(p->weight->data[i]));
97 aubio_pitchyinfft_do (aubio_pitchyinfft_t * p, fvec_t * input, fvec_t * output)
102 cvec_t *res = (cvec_t *) p->res;
103 fvec_t *yin = (fvec_t *) p->yinfft;
107 for (l = 0; l < input->length; l++) {
108 p->winput->data[l] = p->win->data[l] * input->data[l];
110 aubio_fft_do (p->fft, p->winput, p->fftout);
111 for (l = 0; l < p->fftout->length; l++) {
112 p->sqrmag->data[l] = SQR (p->fftout->norm[l]);
113 p->sqrmag->data[l] *= p->weight->data[l];
115 for (l = 1; l < p->fftout->length; l++) {
116 p->sqrmag->data[(p->fftout->length - 1) * 2 - l] =
117 SQR (p->fftout->norm[l]);
118 p->sqrmag->data[(p->fftout->length - 1) * 2 - l] *=
121 for (l = 0; l < p->sqrmag->length / 2 + 1; l++) {
122 sum += p->sqrmag->data[l];
125 aubio_fft_do (p->fft, p->sqrmag, res);
127 for (tau = 1; tau < yin->length; tau++) {
128 yin->data[tau] = sum - res->norm[tau] * COS (res->phas[tau]);
129 tmp += yin->data[tau];
130 yin->data[tau] *= tau / tmp;
132 tau = fvec_min_elem (yin);
133 if (yin->data[tau] < p->tol) {
134 /* no interpolation */
136 /* 3 point quadratic interpolation */
137 //return fvec_quadint_min(yin,tau,1);
138 /* additional check for (unlikely) octave doubling in higher frequencies */
140 output->data[0] = fvec_quadint (yin, tau);
142 /* should compare the minimum value of each interpolated peaks */
143 halfperiod = FLOOR (tau / 2 + .5);
144 if (yin->data[halfperiod] < p->tol)
145 output->data[0] = fvec_quadint (yin, halfperiod);
147 output->data[0] = fvec_quadint (yin, tau);
150 output->data[0] = 0.;
155 del_aubio_pitchyinfft (aubio_pitchyinfft_t * p)
158 del_aubio_fft (p->fft);
159 del_fvec (p->yinfft);
160 del_fvec (p->sqrmag);
162 del_cvec (p->fftout);
163 del_fvec (p->winput);
164 del_fvec (p->weight);
169 aubio_pitchyinfft_set_tolerance (aubio_pitchyinfft_t * p, smpl_t tol)
176 aubio_pitchyinfft_get_tolerance (aubio_pitchyinfft_t * p)