source: src/spectral/mfcc.h @ 517630f

feature/autosinkfeature/constantqfeature/pitchshiftfeature/pydocstringsfeature/timestretch
Last change on this file since 517630f was 517630f, checked in by Paul Brossier <piem@piem.org>, 23 months ago

[mfcc] add set_mel_coeffs and power

  • Property mode set to 100644
File size: 2.4 KB
Line 
1/*
2  Copyright (C) 2007-2013 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/** \file
23
24  Mel-Frequency Cepstrum Coefficients object
25
26  This object computes MFCC coefficients on an input cvec_t.
27
28  The implementation follows the specifications established by Malcolm Slaney
29  in its Auditory Toolbox, available online at the following address (see
30  file mfcc.m):
31
32  https://engineering.purdue.edu/~malcolm/interval/1998-010/
33
34  \example spectral/test-mfcc.c
35
36*/
37
38#ifndef AUBIO_MFCC_H
39#define AUBIO_MFCC_H
40
41#ifdef __cplusplus
42extern "C"
43{
44#endif
45
46/** mfcc object */
47typedef struct _aubio_mfcc_t aubio_mfcc_t;
48
49/** create mfcc object
50
51  \param buf_size size of analysis buffer (and length the FFT transform)
52  \param samplerate audio sampling rate
53  \param n_coeffs number of desired coefficients
54  \param n_filters number of desired filters
55
56*/
57aubio_mfcc_t *new_aubio_mfcc (uint_t buf_size,
58    uint_t n_filters, uint_t n_coeffs, uint_t samplerate);
59
60/** delete mfcc object
61
62  \param mf mfcc object as returned by new_aubio_mfcc
63
64*/
65void del_aubio_mfcc (aubio_mfcc_t * mf);
66
67/** mfcc object processing
68
69  \param mf mfcc object as returned by new_aubio_mfcc
70  \param in input spectrum (buf_size long)
71  \param out output mel coefficients buffer (n_coeffs long)
72
73*/
74void aubio_mfcc_do (aubio_mfcc_t * mf, const cvec_t * in, fvec_t * out);
75
76uint_t aubio_mfcc_set_power (aubio_mfcc_t *mf, smpl_t power);
77uint_t aubio_mfcc_get_power (aubio_mfcc_t *mf);
78
79uint_t aubio_mfcc_set_mel_coeffs (aubio_mfcc_t *mf, smpl_t freq_min,
80    smpl_t freq_max);
81uint_t aubio_mfcc_set_mel_coeffs_htk (aubio_mfcc_t *mf, smpl_t freq_min,
82    smpl_t freq_max);
83uint_t aubio_mfcc_set_mel_coeffs_slaney (aubio_mfcc_t *mf);
84
85#ifdef __cplusplus
86}
87#endif
88
89#endif /* AUBIO_MFCC_H */
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