1 /*
2 Copyright (C) 2013 Paul Brossier <piem@aubio.org>
3
4 This file is part of aubio.
5
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.
10
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.
15
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/>.
18
19 */
20
21 #include "aubio_priv.h"
22 #include "fvec.h"
23 #include "cvec.h"
24 #include "mathutils.h"
25 #include "spectral/fft.h"
26 #include "pitch/pitchspecacf.h"
27
28 /** pitch specacf structure */
29 struct _aubio_pitchspecacf_t
30 {
31 fvec_t *win; /**< temporal weighting window */
32 fvec_t *winput; /**< windowed spectrum */
33 aubio_fft_t *fft; /**< fft object to compute*/
34 fvec_t *fftout; /**< Fourier transform output */
35 fvec_t *sqrmag; /**< square magnitudes */
36 fvec_t *acf; /**< auto correlation function */
37 smpl_t tol; /**< tolerance */
38 smpl_t confidence; /**< confidence */
39 };
40
41 aubio_pitchspecacf_t *
new_aubio_pitchspecacf(uint_t bufsize)42 new_aubio_pitchspecacf (uint_t bufsize)
43 {
44 aubio_pitchspecacf_t *p = AUBIO_NEW (aubio_pitchspecacf_t);
45 p->fft = new_aubio_fft (bufsize);
46 if (!p->fft) goto beach;
47 p->win = new_aubio_window ("hanningz", bufsize);
48 p->winput = new_fvec (bufsize);
49 p->fftout = new_fvec (bufsize);
50 p->sqrmag = new_fvec (bufsize);
51 p->acf = new_fvec (bufsize / 2 + 1);
52 p->tol = 1.;
53 p->confidence = 0.;
54 return p;
55
56 beach:
57 AUBIO_FREE(p);
58 return NULL;
59 }
60
61 void
aubio_pitchspecacf_do(aubio_pitchspecacf_t * p,const fvec_t * input,fvec_t * output)62 aubio_pitchspecacf_do (aubio_pitchspecacf_t * p, const fvec_t * input, fvec_t * output)
63 {
64 uint_t l, tau;
65 fvec_t *fftout = p->fftout;
66 // window the input
67 for (l = 0; l < input->length; l++) {
68 p->winput->data[l] = p->win->data[l] * input->data[l];
69 }
70 // get the real / imag parts of its fft
71 aubio_fft_do_complex (p->fft, p->winput, fftout);
72 for (l = 0; l < input->length / 2 + 1; l++) {
73 p->sqrmag->data[l] = SQR(fftout->data[l]);
74 }
75 // get the real / imag parts of the fft of the squared magnitude
76 aubio_fft_do_complex (p->fft, p->sqrmag, fftout);
77 // copy real part to acf
78 for (l = 0; l < fftout->length / 2 + 1; l++) {
79 p->acf->data[l] = fftout->data[l];
80 }
81 // get the minimum
82 tau = fvec_min_elem (p->acf);
83 // get the interpolated minimum
84 output->data[0] = fvec_quadratic_peak_pos (p->acf, tau) * 2.;
85 }
86
87 void
del_aubio_pitchspecacf(aubio_pitchspecacf_t * p)88 del_aubio_pitchspecacf (aubio_pitchspecacf_t * p)
89 {
90 del_fvec (p->win);
91 del_fvec (p->winput);
92 del_aubio_fft (p->fft);
93 del_fvec (p->sqrmag);
94 del_fvec (p->fftout);
95 del_fvec (p->acf);
96 AUBIO_FREE (p);
97 }
98
99 smpl_t
aubio_pitchspecacf_get_confidence(const aubio_pitchspecacf_t * o)100 aubio_pitchspecacf_get_confidence (const aubio_pitchspecacf_t * o) {
101 // no confidence for now
102 return o->confidence;
103 }
104
105 uint_t
aubio_pitchspecacf_set_tolerance(aubio_pitchspecacf_t * p,smpl_t tol)106 aubio_pitchspecacf_set_tolerance (aubio_pitchspecacf_t * p, smpl_t tol)
107 {
108 p->tol = tol;
109 return 0;
110 }
111
112 smpl_t
aubio_pitchspecacf_get_tolerance(const aubio_pitchspecacf_t * p)113 aubio_pitchspecacf_get_tolerance (const aubio_pitchspecacf_t * p)
114 {
115 return p->tol;
116 }
117