source: src/spectral/awhitening.c @ ed80243

feature/autosinkfeature/constantqfeature/pitchshiftfeature/timestretch
Last change on this file since ed80243 was ed80243, checked in by Paul Brossier <piem@piem.org>, 12 months ago

[awhitening] use shortest length available (closes gh-216)

  • Property mode set to 100644
File size: 3.5 KB
Line 
1/*
2 * Copyright (C) 2003-2015 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 it under the
7 * terms of the GNU General Public License as published by the Free Software
8 * Foundation, either version 3 of the License, or (at your option) any later
9 * version.
10 *
11 * aubio is distributed in the hope that it will be useful, but WITHOUT ANY
12 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
13 * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
14 * details.
15 *
16 * You should have received a copy of the GNU General Public License along with
17 * aubio.  If not, see <http://www.gnu.org/licenses/>.
18 *
19 */
20
21#include "aubio_priv.h"
22#include "fvec.h"
23#include "cvec.h"
24#include "mathutils.h"
25#include "spectral/awhitening.h"
26
27#define aubio_spectral_whitening_default_relax_time   250   // in seconds, between 22 and 446
28#define aubio_spectral_whitening_default_decay        0.001 // -60dB attenuation
29#define aubio_spectral_whitening_default_floor        1.e-4 // from 1.e-6 to .2
30
31/** structure to store object state */
32struct _aubio_spectral_whitening_t {
33  uint_t buf_size;
34  uint_t hop_size;
35  uint_t samplerate;
36  smpl_t relax_time;
37  smpl_t r_decay;
38  smpl_t floor;
39  fvec_t *peak_values;
40};
41
42void
43aubio_spectral_whitening_do (aubio_spectral_whitening_t * o, cvec_t * fftgrain)
44{
45  uint_t i = 0;
46  uint_t length = MIN(fftgrain->length, o->peak_values->length);
47  for (i = 0; i < length; i++) {
48    smpl_t tmp = MAX(o->r_decay * o->peak_values->data[i], o->floor);
49    o->peak_values->data[i] = MAX(fftgrain->norm[i], tmp);
50    fftgrain->norm[i] /= o->peak_values->data[i];
51  }
52}
53
54aubio_spectral_whitening_t *
55new_aubio_spectral_whitening (uint_t buf_size, uint_t hop_size, uint_t samplerate)
56{
57  aubio_spectral_whitening_t *o = AUBIO_NEW (aubio_spectral_whitening_t);
58  if ((sint_t)buf_size < 1) {
59    AUBIO_ERR("spectral_whitening: got buffer_size %d, but can not be < 1\n", buf_size);
60    goto beach;
61  } else if ((sint_t)hop_size < 1) {
62    AUBIO_ERR("spectral_whitening: got hop_size %d, but can not be < 1\n", hop_size);
63    goto beach;
64  } else if ((sint_t)samplerate < 1) {
65    AUBIO_ERR("spectral_whitening: got samplerate %d, but can not be < 1\n", samplerate);
66    goto beach;
67  }
68  o->peak_values = new_fvec (buf_size / 2 + 1);
69  o->buf_size = buf_size;
70  o->hop_size = hop_size;
71  o->samplerate = samplerate;
72  o->floor = aubio_spectral_whitening_default_floor;
73  aubio_spectral_whitening_set_relax_time (o, aubio_spectral_whitening_default_relax_time);
74  aubio_spectral_whitening_reset (o);
75  return o;
76
77beach:
78  AUBIO_FREE(o);
79  return NULL;
80}
81
82uint_t
83aubio_spectral_whitening_set_relax_time (aubio_spectral_whitening_t * o, smpl_t relax_time)
84{
85  o->relax_time = relax_time;
86  o->r_decay = POW (aubio_spectral_whitening_default_decay,
87      (o->hop_size / (float) o->samplerate) / o->relax_time);
88  return AUBIO_OK;
89}
90
91smpl_t
92aubio_spectral_whitening_get_relax_time (aubio_spectral_whitening_t * o)
93{
94  return o->relax_time;
95}
96
97uint_t
98aubio_spectral_whitening_set_floor (aubio_spectral_whitening_t *o, smpl_t floor)
99{
100  o->floor = floor;
101  return AUBIO_OK;
102}
103
104smpl_t aubio_spectral_whitening_get_floor (aubio_spectral_whitening_t *o)
105{
106  return o->floor;
107}
108
109void
110aubio_spectral_whitening_reset (aubio_spectral_whitening_t * o)
111{
112  /* cover the case n == 0. */
113  fvec_set_all (o->peak_values, o->floor);
114}
115
116void
117del_aubio_spectral_whitening (aubio_spectral_whitening_t * o)
118{
119  del_fvec (o->peak_values);
120  AUBIO_FREE (o);
121}
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