source: src/pitch/pitchyin.c @ 5284e0d

feature/autosinkfeature/constantqfeature/pitchshiftfeature/pydocstringsfeature/timestretchpitchshiftsamplertimestretchyinfft+
Last change on this file since 5284e0d was 5284e0d, checked in by Paul Brossier <piem@piem.org>, 8 years ago

src/pitch: start adding confidence

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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 developped 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  smpl_t confidence;
40};
41
42/** compute difference function
43 
44  \param input input signal
45  \param yinbuf output buffer to store difference function (half shorter than input)
46
47*/
48void aubio_pitchyin_diff (fvec_t * input, fvec_t * yinbuf);
49
50/** in place computation of the YIN cumulative normalised function
51 
52  \param yinbuf input signal (a square difference function), also used to store function
53
54*/
55void aubio_pitchyin_getcum (fvec_t * yinbuf);
56
57/** detect pitch in a YIN function
58 
59  \param yinbuf input buffer as computed by aubio_pitchyin_getcum
60
61*/
62uint_t aubio_pitchyin_getpitch (fvec_t * yinbuf);
63
64aubio_pitchyin_t *
65new_aubio_pitchyin (uint_t bufsize)
66{
67  aubio_pitchyin_t *o = AUBIO_NEW (aubio_pitchyin_t);
68  o->yin = new_fvec (bufsize / 2);
69  o->tol = 0.15;
70  return o;
71}
72
73void
74del_aubio_pitchyin (aubio_pitchyin_t * o)
75{
76  del_fvec (o->yin);
77  AUBIO_FREE (o);
78}
79
80/* outputs the difference function */
81void
82aubio_pitchyin_diff (fvec_t * input, fvec_t * yin)
83{
84  uint_t j, tau;
85  smpl_t tmp;
86  for (tau = 0; tau < yin->length; tau++) {
87    yin->data[tau] = 0.;
88  }
89  for (tau = 1; tau < yin->length; tau++) {
90    for (j = 0; j < yin->length; j++) {
91      tmp = input->data[j] - input->data[j + tau];
92      yin->data[tau] += SQR (tmp);
93    }
94  }
95}
96
97/* cumulative mean normalized difference function */
98void
99aubio_pitchyin_getcum (fvec_t * yin)
100{
101  uint_t tau;
102  smpl_t tmp;
103  tmp = 0.;
104  yin->data[0] = 1.;
105  //AUBIO_DBG("%f\t",yin->data[0]);
106  for (tau = 1; tau < yin->length; tau++) {
107    tmp += yin->data[tau];
108    yin->data[tau] *= tau / tmp;
109    //AUBIO_DBG("%f\t",yin->data[tau]);
110  }
111  //AUBIO_DBG("\n");
112}
113
114uint_t
115aubio_pitchyin_getpitch (fvec_t * yin)
116{
117  uint_t tau = 1;
118  do {
119    if (yin->data[tau] < 0.1) {
120      while (yin->data[tau + 1] < yin->data[tau]) {
121        tau++;
122      }
123      return tau;
124    }
125    tau++;
126  } while (tau < yin->length);
127  //AUBIO_DBG("No pitch found");
128  return 0;
129}
130
131
132/* all the above in one */
133void
134aubio_pitchyin_do (aubio_pitchyin_t * o, fvec_t * input, fvec_t * out)
135{
136  smpl_t tol = o->tol;
137  fvec_t *yin = o->yin;
138  uint_t j, tau = 0;
139  sint_t period;
140  smpl_t tmp = 0., tmp2 = 0.;
141  yin->data[0] = 1.;
142  for (tau = 1; tau < yin->length; tau++) {
143    yin->data[tau] = 0.;
144    for (j = 0; j < yin->length; j++) {
145      tmp = input->data[j] - input->data[j + tau];
146      yin->data[tau] += SQR (tmp);
147    }
148    tmp2 += yin->data[tau];
149    yin->data[tau] *= tau / tmp2;
150    period = tau - 3;
151    if (tau > 4 && (yin->data[period] < tol) &&
152        (yin->data[period] < yin->data[period + 1])) {
153      out->data[0] = fvec_quadint (yin, period);
154      goto beach;
155    }
156  }
157  out->data[0] = fvec_quadint (yin, fvec_min_elem (yin));
158beach:
159  return;
160}
161
162smpl_t
163aubio_pitchyin_get_confidence (aubio_pitchyin_t * o) {
164  o->confidence = 1. - fvec_min (o->yin);
165  return o->confidence;
166}
167
168uint_t
169aubio_pitchyin_set_tolerance (aubio_pitchyin_t * o, smpl_t tol)
170{
171  o->tol = tol;
172  return 0;
173}
174
175smpl_t
176aubio_pitchyin_get_tolerance (aubio_pitchyin_t * o)
177{
178  return o->tol;
179}
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