| 1 | /* |
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| 2 | Copyright (C) 2007 Amaury Hazan |
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| 3 | adapted to aubio from LibXtract |
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| 4 | http://libxtract.sourceforge.net/ |
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| 5 | |
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| 6 | |
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| 7 | This program 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 2 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 | This program 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 this program; if not, write to the Free Software |
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| 19 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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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 | Filterbank object |
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| 25 | |
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| 26 | General-purpose spectral filterbank object. Comes with mel-filter initialization function. |
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| 27 | |
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| 28 | */ |
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| 29 | |
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| 30 | #ifndef AUBIOFILTERBANK_H |
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| 31 | #define AUBIOFILTERBANK_H |
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| 32 | |
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| 33 | #ifdef __cplusplus |
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| 34 | extern "C" { |
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| 35 | #endif |
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| 36 | |
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| 37 | |
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| 38 | |
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| 39 | typedef struct aubio_filterbank_t_ aubio_filterbank_t; |
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| 40 | |
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| 41 | /** create filterbank object |
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| 42 | |
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| 43 | \param win_s size of analysis buffer (and length the FFT transform) |
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| 44 | \param n_filters number of filters to create |
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| 45 | |
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| 46 | */ |
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| 47 | |
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| 48 | aubio_filterbank_t * new_aubio_filterbank(uint_t n_filters, uint_t win_s); |
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| 49 | |
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| 50 | /** destroy filterbank object |
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| 51 | |
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| 52 | \param fb filterbank, as returned by new_aubio_filterbank method |
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| 53 | |
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| 54 | */ |
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| 55 | void del_aubio_filterbank(aubio_filterbank_t * fb); |
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| 56 | |
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| 57 | /** filterbank initialization for mel filters |
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| 58 | |
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| 59 | \param fb filterbank, as returned by new_aubio_filterbank method |
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| 60 | \param nyquist nyquist frequency, i.e. half of the sampling rate |
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| 61 | \param style libxtract style |
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| 62 | \param freqmin lowest filter frequency |
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| 63 | \param freqmax highest filter frequency |
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| 64 | |
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| 65 | */ |
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| 66 | void aubio_filterbank_mfcc_init(aubio_filterbank_t * fb, smpl_t nyquist, int style, smpl_t freq_min, smpl_t freq_max); |
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| 67 | |
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| 68 | // Initialization |
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| 69 | |
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| 70 | /** \brief A function to initialise a mel filter bank |
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| 71 | * |
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| 72 | * It is up to the caller to pass in a pointer to memory allocated for freq_bands arrays of length N. This function populates these arrays with magnitude coefficients representing the mel filterbank on a linear scale |
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| 73 | */ |
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| 74 | int aubio_mfcc_init(int N, smpl_t nyquist, int style, smpl_t freq_min, smpl_t freq_max, int freq_bands, smpl_t ** fft_tables); |
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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 |
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