source: src/spectral/mfcc.c @ e744416

feature/autosinkfeature/cnnfeature/cnn_orgfeature/constantqfeature/crepefeature/crepe_orgfeature/pitchshiftfeature/pydocstringsfeature/timestretchfix/ffmpeg5
Last change on this file since e744416 was e744416, checked in by Paul Brossier <piem@piem.org>, 6 years ago

[mfcc] remove plain dct ifdefs

  • Property mode set to 100644
File size: 3.9 KB
Line 
1/*
2  Copyright (C) 2007-2009 Paul Brossier <piem@aubio.org>
3                      and Amaury Hazan <ahazan@iua.upf.edu>
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 "fmat.h"
25#include "cvec.h"
26#include "mathutils.h"
27#include "vecutils.h"
28#include "spectral/fft.h"
29#include "spectral/filterbank.h"
30#include "spectral/filterbank_mel.h"
31#include "spectral/dct.h"
32#include "spectral/mfcc.h"
33
34/** Internal structure for mfcc object */
35
36struct _aubio_mfcc_t
37{
38  uint_t win_s;             /** grain length */
39  uint_t samplerate;        /** sample rate (needed?) */
40  uint_t n_filters;         /** number of filters */
41  uint_t n_coefs;           /** number of coefficients (<= n_filters/2 +1) */
42  aubio_filterbank_t *fb;   /** filter bank */
43  fvec_t *in_dct;           /** input buffer for dct * [fb->n_filters] */
44  aubio_dct_t *dct;         /** dct object */
45  fvec_t *output;           /** dct output */
46  smpl_t scale;
47};
48
49
50aubio_mfcc_t *
51new_aubio_mfcc (uint_t win_s, uint_t n_filters, uint_t n_coefs,
52    uint_t samplerate)
53{
54
55  /* allocate space for mfcc object */
56  aubio_mfcc_t *mfcc = AUBIO_NEW (aubio_mfcc_t);
57
58  mfcc->win_s = win_s;
59  mfcc->samplerate = samplerate;
60  mfcc->n_filters = n_filters;
61  mfcc->n_coefs = n_coefs;
62
63  /* filterbank allocation */
64  mfcc->fb = new_aubio_filterbank (n_filters, mfcc->win_s);
65  if (n_filters == 40)
66    aubio_filterbank_set_mel_coeffs_slaney (mfcc->fb, samplerate);
67  else
68    aubio_filterbank_set_mel_coeffs(mfcc->fb, samplerate,
69        0, samplerate/2.);
70
71  /* allocating buffers */
72  mfcc->in_dct = new_fvec (n_filters);
73
74  mfcc->dct = new_aubio_dct (n_filters);
75  mfcc->output = new_fvec (n_filters);
76
77  mfcc->scale = 1.;
78
79  return mfcc;
80}
81
82void
83del_aubio_mfcc (aubio_mfcc_t * mf)
84{
85
86  /* delete filterbank */
87  del_aubio_filterbank (mf->fb);
88
89  /* delete buffers */
90  del_fvec (mf->in_dct);
91  del_aubio_dct (mf->dct);
92  del_fvec (mf->output);
93
94  /* delete mfcc object */
95  AUBIO_FREE (mf);
96}
97
98
99void
100aubio_mfcc_do (aubio_mfcc_t * mf, const cvec_t * in, fvec_t * out)
101{
102  fvec_t tmp;
103
104  /* compute filterbank */
105  aubio_filterbank_do (mf->fb, in, mf->in_dct);
106
107  /* compute log10 */
108  fvec_log10 (mf->in_dct);
109
110  if (mf->scale != 1) fvec_mul (mf->in_dct, mf->scale);
111
112  /* compute mfccs */
113  aubio_dct_do(mf->dct, mf->in_dct, mf->output);
114  // copy only first n_coeffs elements
115  // TODO assert mf->output->length == n_coeffs
116  tmp.data = mf->output->data;
117  tmp.length = out->length;
118  fvec_copy(&tmp, out);
119
120  return;
121}
122
123uint_t aubio_mfcc_set_power (aubio_mfcc_t *mf, smpl_t power)
124{
125  return aubio_filterbank_set_power(mf->fb, power);
126}
127
128uint_t aubio_mfcc_get_power (aubio_mfcc_t *mf)
129{
130  return aubio_filterbank_get_power(mf->fb);
131}
132
133uint_t aubio_mfcc_set_scale (aubio_mfcc_t *mf, smpl_t scale)
134{
135  mf->scale = scale;
136  return AUBIO_OK;
137}
138
139uint_t aubio_mfcc_get_scale (aubio_mfcc_t *mf)
140{
141  return mf->scale;
142}
143
144uint_t aubio_mfcc_set_mel_coeffs (aubio_mfcc_t *mf, smpl_t freq_min,
145    smpl_t freq_max)
146{
147  return aubio_filterbank_set_mel_coeffs(mf->fb, mf->samplerate,
148      freq_min, freq_max);
149}
150
151uint_t aubio_mfcc_set_mel_coeffs_htk (aubio_mfcc_t *mf, smpl_t freq_min,
152    smpl_t freq_max)
153{
154  return aubio_filterbank_set_mel_coeffs_htk(mf->fb, mf->samplerate,
155      freq_min, freq_max);
156}
157
158uint_t aubio_mfcc_set_mel_coeffs_slaney (aubio_mfcc_t *mf)
159{
160  return aubio_filterbank_set_mel_coeffs_slaney (mf->fb, mf->samplerate);
161}
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