| 1 | /* |
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| 2 | Copyright (C) 2007-2013 Paul Brossier <piem@aubio.org> |
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| 3 | and Amaury Hazan <ahazan@iua.upf.edu> |
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| 4 | |
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| 5 | This file is part of aubio. |
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| 6 | |
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| 7 | aubio is free software: you can redistribute it and/or modify |
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| 8 | it under the terms of the GNU General Public License as published by |
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| 9 | the Free Software Foundation, either version 3 of the License, or |
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| 10 | (at your option) any later version. |
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| 11 | |
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| 12 | aubio is distributed in the hope that it will be useful, |
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| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 15 | GNU General Public License for more details. |
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| 16 | |
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| 17 | You should have received a copy of the GNU General Public License |
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| 18 | along with aubio. If not, see <http://www.gnu.org/licenses/>. |
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| 19 | |
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| 20 | */ |
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| 21 | |
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| 22 | /** \file |
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| 23 | |
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| 24 | Mel-Frequency Cepstrum Coefficients object |
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| 25 | |
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| 26 | This object computes MFCC coefficients on an input cvec_t. |
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| 27 | |
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| 28 | The implementation follows the specifications established by Malcolm Slaney |
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| 29 | in its Auditory Toolbox, available online (see file mfcc.m). |
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| 30 | |
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| 31 | http://engineering.ecn.purdue.edu/~malcolm/interval/1998-010/ |
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| 32 | |
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| 33 | \example spectral/test-mfcc.c |
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| 34 | |
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| 35 | */ |
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| 36 | |
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| 37 | #ifndef _AUBIO_MFCC_H |
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| 38 | #define _AUBIO_MFCC_H |
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| 39 | |
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| 40 | #ifdef __cplusplus |
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| 41 | extern "C" |
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| 42 | { |
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| 43 | #endif |
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| 44 | |
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| 45 | /** mfcc object */ |
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| 46 | typedef struct _aubio_mfcc_t aubio_mfcc_t; |
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| 47 | |
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| 48 | /** create mfcc object |
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| 49 | |
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| 50 | \param buf_size size of analysis buffer (and length the FFT transform) |
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| 51 | \param samplerate audio sampling rate |
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| 52 | \param n_coeffs number of desired coefficients |
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| 53 | \param n_filters number of desired filters |
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| 54 | |
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| 55 | */ |
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| 56 | aubio_mfcc_t *new_aubio_mfcc (uint_t buf_size, |
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| 57 | uint_t n_filters, uint_t n_coeffs, uint_t samplerate); |
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| 58 | |
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| 59 | /** delete mfcc object |
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| 60 | |
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| 61 | \param mf mfcc object as returned by new_aubio_mfcc |
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| 62 | |
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| 63 | */ |
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| 64 | void del_aubio_mfcc (aubio_mfcc_t * mf); |
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| 65 | |
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| 66 | /** mfcc object processing |
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| 67 | |
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| 68 | \param mf mfcc object as returned by new_aubio_mfcc |
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| 69 | \param in input spectrum (buf_size long) |
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| 70 | \param out output mel coefficients buffer (n_coeffs long) |
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| 71 | |
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| 72 | */ |
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| 73 | void aubio_mfcc_do (aubio_mfcc_t * mf, const cvec_t * in, fvec_t * out); |
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| 74 | |
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| 75 | #ifdef __cplusplus |
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| 76 | } |
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| 77 | #endif |
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| 78 | |
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| 79 | #endif /* _AUBIO_MFCC_H */ |
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