source: src/pitch/pitchfcomb.c @ 32d6958

feature/autosinkfeature/constantqfeature/pitchshiftfeature/pydocstringsfeature/timestretchpitchshiftsamplertimestretchyinfft+
Last change on this file since 32d6958 was 32d6958, checked in by Paul Brossier <piem@piem.org>, 13 years ago

src/: more moving and splitting

  • Property mode set to 100644
File size: 3.7 KB
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1/*
2   Copyright (C) 2004, 2005  Mario Lang <mlang@delysid.org>
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
20#include "aubio_priv.h"
21#include "sample.h"
22#include "mathutils.h"
23#include "spectral/fft.h"
24#include "pitch/pitchfcomb.h"
25
26#define MAX_PEAKS 8
27
28typedef struct {
29  smpl_t freq;
30  smpl_t db;
31} aubio_fpeak_t;
32
33struct _aubio_pitchfcomb_t {
34  uint_t fftSize;
35  uint_t stepSize;
36  uint_t rate;
37  fvec_t * winput;
38  fvec_t * win;
39  cvec_t * fftOut;
40  fvec_t * fftLastPhase;
41  aubio_fft_t * fft;
42  //aubio_pvoc_t * pvoc;
43};
44
45aubio_pitchfcomb_t * new_aubio_pitchfcomb (uint_t bufsize, uint_t hopsize, uint_t samplerate)
46{
47  aubio_pitchfcomb_t * p = AUBIO_NEW(aubio_pitchfcomb_t);
48  p->rate         = samplerate;
49  p->fftSize      = bufsize;
50  p->stepSize     = hopsize;
51  p->winput       = new_fvec(bufsize,1);
52  p->fftOut       = new_cvec(bufsize,1);
53  p->fftLastPhase = new_fvec(bufsize,1);
54  p->fft = new_aubio_fft(bufsize, 1);
55  p->win = new_fvec(bufsize,1);
56  aubio_window(p->win->data[0], bufsize, aubio_win_hanning);
57  return p;
58}
59
60/* input must be stepsize long */
61smpl_t aubio_pitchfcomb_detect (aubio_pitchfcomb_t * p, fvec_t * input)
62{
63  uint_t k, l, maxharm = 0;
64  smpl_t freqPerBin = p->rate/(smpl_t)p->fftSize,
65    phaseDifference = TWO_PI*(smpl_t)p->stepSize/(smpl_t)p->fftSize;
66  aubio_fpeak_t peaks[MAX_PEAKS];
67
68  for (k=0; k<MAX_PEAKS; k++) {
69    peaks[k].db = -200.;
70    peaks[k].freq = 0.;
71  }
72
73  for (k=0; k < input->length; k++){
74    p->winput->data[0][k] = p->win->data[0][k] * input->data[0][k];
75  }
76  aubio_fft_do(p->fft,p->winput,p->fftOut);
77
78  for (k=0; k<=p->fftSize/2; k++) {
79    smpl_t
80      magnitude = 20.*LOG10(2.*p->fftOut->norm[0][k]/(smpl_t)p->fftSize),
81      phase     = p->fftOut->phas[0][k],
82      tmp, freq;
83
84    /* compute phase difference */
85    tmp = phase - p->fftLastPhase->data[0][k];
86    p->fftLastPhase->data[0][k] = phase;
87
88    /* subtract expected phase difference */
89    tmp -= (smpl_t)k*phaseDifference;
90
91    /* map delta phase into +/- Pi interval */
92    tmp = aubio_unwrap2pi(tmp);
93
94    /* get deviation from bin frequency from the +/- Pi interval */
95    tmp = p->fftSize/(smpl_t)p->stepSize*tmp/(TWO_PI);
96
97    /* compute the k-th partials' true frequency */
98    freq = (smpl_t)k*freqPerBin + tmp*freqPerBin;
99
100    if (freq > 0.0 && magnitude > peaks[0].db) { // && magnitude < 0) {
101      memmove(peaks+1, peaks, sizeof(aubio_fpeak_t)*(MAX_PEAKS-1));
102      peaks[0].freq = freq;
103      peaks[0].db = magnitude;
104    }
105  }
106
107  k = 0;
108  for (l=1; l<MAX_PEAKS && peaks[l].freq > 0.0; l++) {
109    sint_t harmonic;
110    for (harmonic=5; harmonic>1; harmonic--) {
111      if (peaks[0].freq / peaks[l].freq < harmonic+.02 &&
112          peaks[0].freq / peaks[l].freq > harmonic-.02) {
113        if (harmonic > (sint_t)maxharm &&
114            peaks[0].db < peaks[l].db/2) {
115          maxharm = harmonic;
116          k = l;
117        }
118      }
119    }
120  }
121  /* quick hack to clean output a bit */
122  if (peaks[k].freq > 5000.) return 0.;
123  return peaks[k].freq;
124}
125
126void del_aubio_pitchfcomb (aubio_pitchfcomb_t * p)
127{
128  del_cvec(p->fftOut);
129  del_fvec(p->fftLastPhase);
130  del_fvec(p->win);
131  del_fvec(p->winput);
132  del_aubio_fft(p->fft);
133  AUBIO_FREE(p);
134}
135
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