source: src/pitch/pitchfcomb.c @ fddfa64

feature/autosinkfeature/cnnfeature/cnn_orgfeature/constantqfeature/crepefeature/crepe_orgfeature/pitchshiftfeature/pydocstringsfeature/timestretchfix/ffmpeg5pitchshiftsamplertimestretchyinfft+
Last change on this file since fddfa64 was fddfa64, checked in by Paul Brossier <piem@piem.org>, 14 years ago

src/pitch/: indent

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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, uint_t channels)
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, 1);
57  p->fftOut = new_cvec (bufsize, 1);
58  p->fftLastPhase = new_fvec (bufsize, channels);
59  p->fft = new_aubio_fft (bufsize, 1);
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 i, 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 (i = 0; i < input->channels; i++) {
73
74    for (k = 0; k < MAX_PEAKS; k++) {
75      peaks[k].db = -200.;
76      peaks[k].bin = 0.;
77    }
78
79    for (k = 0; k < input->length; k++) {
80      p->winput->data[0][k] = p->win->data[0][k] * input->data[i][k];
81    }
82    aubio_fft_do (p->fft, p->winput, p->fftOut);
83
84    for (k = 0; k <= p->fftSize / 2; k++) {
85      smpl_t
86          magnitude =
87          20. * LOG10 (2. * p->fftOut->norm[0][k] / (smpl_t) p->fftSize),
88          phase = p->fftOut->phas[0][k], tmp, bin;
89
90      /* compute phase difference */
91      tmp = phase - p->fftLastPhase->data[i][k];
92      p->fftLastPhase->data[i][k] = phase;
93
94      /* subtract expected phase difference */
95      tmp -= (smpl_t) k *phaseDifference;
96
97      /* map delta phase into +/- Pi interval */
98      tmp = aubio_unwrap2pi (tmp);
99
100      /* get deviation from bin frequency from the +/- Pi interval */
101      tmp = p->fftSize / (smpl_t) p->stepSize * tmp / (TWO_PI);
102
103      /* compute the k-th partials' true bin */
104      bin = (smpl_t) k + tmp;
105
106      if (bin > 0.0 && magnitude > peaks[0].db) {       // && magnitude < 0) {
107        memmove (peaks + 1, peaks, sizeof (aubio_fpeak_t) * (MAX_PEAKS - 1));
108        peaks[0].bin = bin;
109        peaks[0].db = magnitude;
110      }
111    }
112
113    k = 0;
114    for (l = 1; l < MAX_PEAKS && peaks[l].bin > 0.0; l++) {
115      sint_t harmonic;
116      for (harmonic = 5; harmonic > 1; harmonic--) {
117        if (peaks[0].bin / peaks[l].bin < harmonic + .02 &&
118            peaks[0].bin / peaks[l].bin > harmonic - .02) {
119          if (harmonic > (sint_t) maxharm && peaks[0].db < peaks[l].db / 2) {
120            maxharm = harmonic;
121            k = l;
122          }
123        }
124      }
125    }
126    output->data[i][0] = peaks[k].bin;
127    /* quick hack to clean output a bit */
128    if (peaks[k].bin > 5000.)
129      output->data[i][0] = 0.;
130  }
131}
132
133void
134del_aubio_pitchfcomb (aubio_pitchfcomb_t * p)
135{
136  del_cvec (p->fftOut);
137  del_fvec (p->fftLastPhase);
138  del_fvec (p->win);
139  del_fvec (p->winput);
140  del_aubio_fft (p->fft);
141  AUBIO_FREE (p);
142}
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