source: src/pitch/pitchyin.c @ bf3ce2c

feature/crepe_org
Last change on this file since bf3ce2c was c0ce78f, checked in by Paul Brossier <piem@piem.org>, 6 years ago

[pitch] comment out unused functions in mcomb and yin

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File size: 4.3 KB
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1/*
2  Copyright (C) 2003-2009 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/* This algorithm was developed by A. de Cheveigné and H. Kawahara and
22 * published in:
23 *
24 * de Cheveigné, A., Kawahara, H. (2002) "YIN, a fundamental frequency
25 * estimator for speech and music", J. Acoust. Soc. Am. 111, 1917-1930. 
26 *
27 * see http://recherche.ircam.fr/equipes/pcm/pub/people/cheveign.html
28 */
29
30#include "aubio_priv.h"
31#include "fvec.h"
32#include "mathutils.h"
33#include "pitch/pitchyin.h"
34
35struct _aubio_pitchyin_t
36{
37  fvec_t *yin;
38  smpl_t tol;
39  uint_t peak_pos;
40};
41
42#if 0
43/** compute difference function
44
45  \param input input signal
46  \param yinbuf output buffer to store difference function (half shorter than input)
47
48*/
49void aubio_pitchyin_diff (fvec_t * input, fvec_t * yinbuf);
50
51/** in place computation of the YIN cumulative normalised function
52
53  \param yinbuf input signal (a square difference function), also used to store function
54
55*/
56void aubio_pitchyin_getcum (fvec_t * yinbuf);
57
58/** detect pitch in a YIN function
59
60  \param yinbuf input buffer as computed by aubio_pitchyin_getcum
61
62*/
63uint_t aubio_pitchyin_getpitch (const fvec_t * yinbuf);
64#endif
65
66aubio_pitchyin_t *
67new_aubio_pitchyin (uint_t bufsize)
68{
69  aubio_pitchyin_t *o = AUBIO_NEW (aubio_pitchyin_t);
70  o->yin = new_fvec (bufsize / 2);
71  o->tol = 0.15;
72  o->peak_pos = 0;
73  return o;
74}
75
76void
77del_aubio_pitchyin (aubio_pitchyin_t * o)
78{
79  del_fvec (o->yin);
80  AUBIO_FREE (o);
81}
82
83#if 0
84/* outputs the difference function */
85void
86aubio_pitchyin_diff (fvec_t * input, fvec_t * yin)
87{
88  uint_t j, tau;
89  smpl_t tmp;
90  for (tau = 0; tau < yin->length; tau++) {
91    yin->data[tau] = 0.;
92  }
93  for (tau = 1; tau < yin->length; tau++) {
94    for (j = 0; j < yin->length; j++) {
95      tmp = input->data[j] - input->data[j + tau];
96      yin->data[tau] += SQR (tmp);
97    }
98  }
99}
100
101/* cumulative mean normalized difference function */
102void
103aubio_pitchyin_getcum (fvec_t * yin)
104{
105  uint_t tau;
106  smpl_t tmp = 0.;
107  yin->data[0] = 1.;
108  //AUBIO_DBG("%f\t",yin->data[0]);
109  for (tau = 1; tau < yin->length; tau++) {
110    tmp += yin->data[tau];
111    yin->data[tau] *= tau / tmp;
112    //AUBIO_DBG("%f\t",yin->data[tau]);
113  }
114  //AUBIO_DBG("\n");
115}
116
117uint_t
118aubio_pitchyin_getpitch (const fvec_t * yin)
119{
120  uint_t tau = 1;
121  do {
122    if (yin->data[tau] < 0.1) {
123      while (yin->data[tau + 1] < yin->data[tau]) {
124        tau++;
125      }
126      return tau;
127    }
128    tau++;
129  } while (tau < yin->length);
130  //AUBIO_DBG("No pitch found");
131  return 0;
132}
133#endif
134
135/* all the above in one */
136void
137aubio_pitchyin_do (aubio_pitchyin_t * o, const fvec_t * input, fvec_t * out)
138{
139  const smpl_t tol = o->tol;
140  fvec_t* yin = o->yin;
141  const smpl_t *input_data = input->data;
142  const uint_t length = yin->length;
143  smpl_t *yin_data = yin->data;
144  uint_t j, tau;
145  sint_t period;
146  smpl_t tmp, tmp2 = 0.;
147
148  yin_data[0] = 1.;
149  for (tau = 1; tau < length; tau++) {
150    yin_data[tau] = 0.;
151    for (j = 0; j < length; j++) {
152      tmp = input_data[j] - input_data[j + tau];
153      yin_data[tau] += SQR (tmp);
154    }
155    tmp2 += yin_data[tau];
156    if (tmp2 != 0) {
157      yin->data[tau] *= tau / tmp2;
158    } else {
159      yin->data[tau] = 1.;
160    }
161    period = tau - 3;
162    if (tau > 4 && (yin_data[period] < tol) &&
163        (yin_data[period] < yin_data[period + 1])) {
164      o->peak_pos = (uint_t)period;
165      out->data[0] = fvec_quadratic_peak_pos (yin, o->peak_pos);
166      return;
167    }
168  }
169  o->peak_pos = (uint_t)fvec_min_elem (yin);
170  out->data[0] = fvec_quadratic_peak_pos (yin, o->peak_pos);
171}
172
173smpl_t
174aubio_pitchyin_get_confidence (aubio_pitchyin_t * o) {
175  return 1. - o->yin->data[o->peak_pos];
176}
177
178uint_t
179aubio_pitchyin_set_tolerance (aubio_pitchyin_t * o, smpl_t tol)
180{
181  o->tol = tol;
182  return 0;
183}
184
185smpl_t
186aubio_pitchyin_get_tolerance (aubio_pitchyin_t * o)
187{
188  return o->tol;
189}
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