source: src/pitch/pitchfcomb.c @ 5d16185

feature/autosinkfeature/cnnfeature/cnn_orgfeature/constantqfeature/crepefeature/crepe_orgfeature/pitchshiftfeature/pydocstringsfeature/timestretchfix/ffmpeg5pitchshiftsamplertimestretchyinfft+
Last change on this file since 5d16185 was 168337e, checked in by Paul Brossier <piem@piem.org>, 15 years ago

src/pitch: switch to mono

  • Property mode set to 100644
File size: 3.6 KB
Line 
1/*
2  Copyright (C) 2004, 2005  Mario Lang <mlang@delysid.org>
3  Copyright (C) 2003-2009 Paul Brossier <piem@aubio.org>
4
5  This file is part of aubio.
6
7  aubio is free software: you can redistribute it and/or modify
8  it under the terms of the GNU General Public License as published by
9  the Free Software Foundation, either version 3 of the License, or
10  (at your option) any later version.
11
12  aubio is distributed in the hope that it will be useful,
13  but WITHOUT ANY WARRANTY; without even the implied warranty of
14  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  GNU General Public License for more details.
16
17  You should have received a copy of the GNU General Public License
18  along with aubio.  If not, see <http://www.gnu.org/licenses/>.
19
20*/
21
22#include "aubio_priv.h"
23#include "fvec.h"
24#include "cvec.h"
25#include "mathutils.h"
26#include "musicutils.h"
27#include "spectral/fft.h"
28#include "pitch/pitchfcomb.h"
29
30#define MAX_PEAKS 8
31
32typedef struct
33{
34  smpl_t bin;
35  smpl_t db;
36} aubio_fpeak_t;
37
38struct _aubio_pitchfcomb_t
39{
40  uint_t fftSize;
41  uint_t stepSize;
42  uint_t rate;
43  fvec_t *winput;
44  fvec_t *win;
45  cvec_t *fftOut;
46  fvec_t *fftLastPhase;
47  aubio_fft_t *fft;
48};
49
50aubio_pitchfcomb_t *
51new_aubio_pitchfcomb (uint_t bufsize, uint_t hopsize)
52{
53  aubio_pitchfcomb_t *p = AUBIO_NEW (aubio_pitchfcomb_t);
54  p->fftSize = bufsize;
55  p->stepSize = hopsize;
56  p->winput = new_fvec (bufsize);
57  p->fftOut = new_cvec (bufsize);
58  p->fftLastPhase = new_fvec (bufsize);
59  p->fft = new_aubio_fft (bufsize);
60  p->win = new_aubio_window ("hanning", bufsize);
61  return p;
62}
63
64/* input must be stepsize long */
65void
66aubio_pitchfcomb_do (aubio_pitchfcomb_t * p, fvec_t * input, fvec_t * output)
67{
68  uint_t k, l, maxharm = 0;
69  smpl_t phaseDifference = TWO_PI * (smpl_t) p->stepSize / (smpl_t) p->fftSize;
70  aubio_fpeak_t peaks[MAX_PEAKS];
71
72  for (k = 0; k < MAX_PEAKS; k++) {
73    peaks[k].db = -200.;
74    peaks[k].bin = 0.;
75  }
76
77  for (k = 0; k < input->length; k++) {
78    p->winput->data[k] = p->win->data[k] * input->data[k];
79  }
80  aubio_fft_do (p->fft, p->winput, p->fftOut);
81
82  for (k = 0; k <= p->fftSize / 2; k++) {
83    smpl_t
84        magnitude =
85        20. * LOG10 (2. * p->fftOut->norm[k] / (smpl_t) p->fftSize),
86        phase = p->fftOut->phas[k], tmp, bin;
87
88    /* compute phase difference */
89    tmp = phase - p->fftLastPhase->data[k];
90    p->fftLastPhase->data[k] = phase;
91
92    /* subtract expected phase difference */
93    tmp -= (smpl_t) k *phaseDifference;
94
95    /* map delta phase into +/- Pi interval */
96    tmp = aubio_unwrap2pi (tmp);
97
98    /* get deviation from bin frequency from the +/- Pi interval */
99    tmp = p->fftSize / (smpl_t) p->stepSize * tmp / (TWO_PI);
100
101    /* compute the k-th partials' true bin */
102    bin = (smpl_t) k + tmp;
103
104    if (bin > 0.0 && magnitude > peaks[0].db) {       // && magnitude < 0) {
105      memmove (peaks + 1, peaks, sizeof (aubio_fpeak_t) * (MAX_PEAKS - 1));
106      peaks[0].bin = bin;
107      peaks[0].db = magnitude;
108    }
109  }
110
111  k = 0;
112  for (l = 1; l < MAX_PEAKS && peaks[l].bin > 0.0; l++) {
113    sint_t harmonic;
114    for (harmonic = 5; harmonic > 1; harmonic--) {
115      if (peaks[0].bin / peaks[l].bin < harmonic + .02 &&
116          peaks[0].bin / peaks[l].bin > harmonic - .02) {
117        if (harmonic > (sint_t) maxharm && peaks[0].db < peaks[l].db / 2) {
118          maxharm = harmonic;
119          k = l;
120        }
121      }
122    }
123  }
124  output->data[0] = peaks[k].bin;
125  /* quick hack to clean output a bit */
126  if (peaks[k].bin > 5000.)
127    output->data[0] = 0.;
128}
129
130void
131del_aubio_pitchfcomb (aubio_pitchfcomb_t * p)
132{
133  del_cvec (p->fftOut);
134  del_fvec (p->fftLastPhase);
135  del_fvec (p->win);
136  del_fvec (p->winput);
137  del_aubio_fft (p->fft);
138  AUBIO_FREE (p);
139}
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