| 1 | /* |
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| 2 | Copyright (C) 2007 Amaury Hazan <ahazan@iua.upf.edu> |
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| 3 | and Paul Brossier <piem@piem.org> |
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| 4 | |
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| 5 | This program is free software; you can redistribute it and/or modify |
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| 6 | it under the terms of the GNU General Public License as published by |
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| 7 | the Free Software Foundation; either version 2 of the License, or |
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| 8 | (at your option) any later version. |
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| 9 | |
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| 10 | This program is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 13 | GNU General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU General Public License |
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| 16 | along with this program; if not, write to the Free Software |
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| 17 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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| 18 | */ |
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| 19 | |
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| 20 | /** \file |
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| 21 | |
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| 22 | Filterbank object |
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| 23 | |
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| 24 | General-purpose spectral filterbank object. Comes with mel-filter initialization function. |
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| 25 | |
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| 26 | */ |
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| 27 | |
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| 28 | #ifndef FILTERBANK_H |
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| 29 | #define FILTERBANK_H |
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| 30 | |
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| 31 | #ifdef __cplusplus |
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| 32 | extern "C" { |
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| 33 | #endif |
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| 34 | |
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| 35 | /** filterbank object */ |
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| 36 | typedef struct aubio_filterbank_t_ aubio_filterbank_t; |
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| 37 | |
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| 38 | /** create filterbank object |
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| 39 | |
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| 40 | \param win_s size of analysis buffer (and length the FFT transform) |
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| 41 | \param n_filters number of filters to create |
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| 42 | |
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| 43 | */ |
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| 44 | |
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| 45 | aubio_filterbank_t * new_aubio_filterbank(uint_t n_filters, uint_t win_s); |
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| 46 | |
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| 47 | /** filterbank initialization for mel filters |
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| 48 | |
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| 49 | |
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| 50 | \param n_filters number of filters |
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| 51 | \param win_s window size |
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| 52 | \param samplerate |
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| 53 | \param freq_min lowest filter frequency |
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| 54 | \param freq_max highest filter frequency |
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| 55 | |
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| 56 | */ |
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| 57 | aubio_filterbank_t * new_aubio_filterbank_mfcc(uint_t n_filters, uint_t win_s, uint_t samplerate, smpl_t freq_min, smpl_t freq_max); |
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| 58 | |
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| 59 | /** destroy filterbank object |
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| 60 | |
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| 61 | \param fb filterbank, as returned by new_aubio_filterbank method |
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| 62 | |
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| 63 | */ |
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| 64 | void del_aubio_filterbank(aubio_filterbank_t * fb); |
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| 65 | |
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| 66 | /** compute filterbank |
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| 67 | |
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| 68 | */ |
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| 69 | void aubio_filterbank_do(aubio_filterbank_t * fb, cvec_t * in, fvec_t *out); |
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| 70 | |
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| 71 | /** return the vector containing the filter coefficients of one channel |
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| 72 | |
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| 73 | */ |
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| 74 | fvec_t * aubio_filterbank_getchannel(aubio_filterbank_t * f, uint_t channel); |
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| 75 | |
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| 76 | #ifdef __cplusplus |
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| 77 | } |
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| 78 | #endif |
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| 79 | |
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| 80 | #endif // FILTERBANK_H |
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