source: src/pitch/pitchyin.c @ c5c0c98

feature/autosinkfeature/constantqfeature/pitchshiftfeature/pydocstringsfeature/timestretchpitchshiftsamplertimestretchyinfft+
Last change on this file since c5c0c98 was c5c0c98, checked in by Paul Brossier <piem@piem.org>, 11 years ago

src/mathutils.c: merge and fix vec_quadint_min and _max into simpler and more exact vec_quadint, use in src/pitch algorithms

  • Property mode set to 100644
File size: 3.0 KB
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1/*
2   Copyright (C) 2003 Paul Brossier
3
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.
8
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.
13
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.
17*/
18
19/* This algorithm was developped by A. de Cheveigne and H. Kawahara and
20 * published in:
21 *
22 * de Cheveigné, A., Kawahara, H. (2002) "YIN, a fundamental frequency
23 * estimator for speech and music", J. Acoust. Soc. Am. 111, 1917-1930. 
24 *
25 * see http://recherche.ircam.fr/equipes/pcm/pub/people/cheveign.html
26 */
27
28#include "aubio_priv.h"
29#include "fvec.h"
30#include "mathutils.h"
31#include "pitch/pitchyin.h"
32
33/* outputs the difference function */
34void aubio_pitchyin_diff(fvec_t * input, fvec_t * yin){
35  uint_t c,j,tau;
36  smpl_t tmp;
37  for (c=0;c<input->channels;c++)
38  {
39    for (tau=0;tau<yin->length;tau++)
40    {
41      yin->data[c][tau] = 0.;
42    }
43    for (tau=1;tau<yin->length;tau++)
44    {
45      for (j=0;j<yin->length;j++)
46      {
47        tmp = input->data[c][j] - input->data[c][j+tau];
48        yin->data[c][tau] += SQR(tmp);
49      }
50    }
51  }
52}
53
54/* cumulative mean normalized difference function */
55void aubio_pitchyin_getcum(fvec_t * yin) {
56  uint_t c,tau;
57  smpl_t tmp;
58  for (c=0;c<yin->channels;c++)
59  {
60    tmp = 0.;
61    yin->data[c][0] = 1.;
62    //AUBIO_DBG("%f\t",yin->data[c][0]);
63    for (tau=1;tau<yin->length;tau++)
64    {
65      tmp += yin->data[c][tau];
66      yin->data[c][tau] *= tau/tmp;
67      //AUBIO_DBG("%f\t",yin->data[c][tau]);
68    }
69    //AUBIO_DBG("\n");
70  }
71}
72
73uint_t aubio_pitchyin_getpitch(fvec_t * yin) {
74  uint_t c=0,tau=1;
75  do 
76  {
77    if(yin->data[c][tau] < 0.1) { 
78      while (yin->data[c][tau+1] < yin->data[c][tau]) {
79        tau++;
80      }
81      return tau;
82    }
83    tau++;
84  } while (tau<yin->length);
85  //AUBIO_DBG("No pitch found");
86  return 0;
87}
88
89
90/* all the above in one */
91smpl_t aubio_pitchyin_getpitchfast(fvec_t * input, fvec_t * yin, smpl_t tol){
92  uint_t c=0,j,tau = 0;
93  sint_t period;
94  smpl_t tmp = 0., tmp2 = 0.;
95  yin->data[c][0] = 1.;
96  for (tau=1;tau<yin->length;tau++)
97  {
98    yin->data[c][tau] = 0.;
99    for (j=0;j<yin->length;j++)
100    {
101      tmp = input->data[c][j] - input->data[c][j+tau];
102      yin->data[c][tau] += SQR(tmp);
103    }
104    tmp2 += yin->data[c][tau];
105    yin->data[c][tau] *= tau/tmp2;
106    period = tau-3;
107    if(tau > 4 && (yin->data[c][period] < tol) && 
108        (yin->data[c][period] < yin->data[c][period+1])) {
109      return vec_quadint(yin,period,1);
110    }
111  }
112  return vec_quadint(yin,vec_min_elem(yin),1);
113  //return 0;
114}
115
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