2 Copyright (C) 2007-2009 Paul Brossier <piem@aubio.org>
3 and Amaury Hazan <ahazan@iua.upf.edu>
5 This file is part of aubio.
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.
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.
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/>.
22 #include "aubio_priv.h"
26 #include "mathutils.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"
34 /** Internal structure for mfcc object */
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 */
51 new_aubio_mfcc (uint_t win_s, uint_t n_filters, uint_t n_coefs,
55 /* allocate space for mfcc object */
56 aubio_mfcc_t *mfcc = AUBIO_NEW (aubio_mfcc_t);
58 if ((sint_t)n_coefs <= 0) {
59 AUBIO_ERR("mfcc: n_coefs should be > 0, got %d\n", n_coefs);
62 if ((sint_t)samplerate <= 0) {
63 AUBIO_ERR("mfcc: samplerate should be > 0, got %d\n", samplerate);
68 mfcc->samplerate = samplerate;
69 mfcc->n_filters = n_filters;
70 mfcc->n_coefs = n_coefs;
72 /* filterbank allocation */
73 mfcc->fb = new_aubio_filterbank (n_filters, mfcc->win_s);
79 aubio_filterbank_set_mel_coeffs_slaney (mfcc->fb, samplerate);
81 aubio_filterbank_set_mel_coeffs(mfcc->fb, samplerate,
84 /* allocating buffers */
85 mfcc->in_dct = new_fvec (n_filters);
87 mfcc->dct = new_aubio_dct (n_filters);
88 mfcc->output = new_fvec (n_filters);
90 if (!mfcc->in_dct || !mfcc->dct || !mfcc->output)
103 del_aubio_mfcc (aubio_mfcc_t * mf)
106 del_aubio_filterbank (mf->fb);
108 del_fvec (mf->in_dct);
110 del_aubio_dct (mf->dct);
112 del_fvec (mf->output);
118 aubio_mfcc_do (aubio_mfcc_t * mf, const cvec_t * in, fvec_t * out)
122 /* compute filterbank */
123 aubio_filterbank_do (mf->fb, in, mf->in_dct);
126 fvec_log10 (mf->in_dct);
128 if (mf->scale != 1) fvec_mul (mf->in_dct, mf->scale);
131 aubio_dct_do(mf->dct, mf->in_dct, mf->output);
132 // copy only first n_coeffs elements
133 // TODO assert mf->output->length == n_coeffs
134 tmp.data = mf->output->data;
135 tmp.length = out->length;
136 fvec_copy(&tmp, out);
141 uint_t aubio_mfcc_set_power (aubio_mfcc_t *mf, smpl_t power)
143 return aubio_filterbank_set_power(mf->fb, power);
146 smpl_t aubio_mfcc_get_power (aubio_mfcc_t *mf)
148 return aubio_filterbank_get_power(mf->fb);
151 uint_t aubio_mfcc_set_scale (aubio_mfcc_t *mf, smpl_t scale)
157 smpl_t aubio_mfcc_get_scale (aubio_mfcc_t *mf)
162 uint_t aubio_mfcc_set_mel_coeffs (aubio_mfcc_t *mf, smpl_t freq_min,
165 return aubio_filterbank_set_mel_coeffs(mf->fb, mf->samplerate,
169 uint_t aubio_mfcc_set_mel_coeffs_htk (aubio_mfcc_t *mf, smpl_t freq_min,
172 return aubio_filterbank_set_mel_coeffs_htk(mf->fb, mf->samplerate,
176 uint_t aubio_mfcc_set_mel_coeffs_slaney (aubio_mfcc_t *mf)
178 return aubio_filterbank_set_mel_coeffs_slaney (mf->fb, mf->samplerate);