| 1 | /* |
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| 2 | Copyright (C) 2007-2009 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 | Filterbank object |
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| 25 | |
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| 26 | General-purpose spectral filterbank object. |
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| 27 | |
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| 28 | */ |
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| 29 | |
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| 30 | #ifndef FILTERBANK_H |
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| 31 | #define FILTERBANK_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 | { |
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| 36 | #endif |
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| 37 | |
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| 38 | /** filterbank object */ |
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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 | /** compute filterbank |
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| 58 | |
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| 59 | \param fb filterbank containing nfilt x win_s filter coefficients |
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| 60 | \param in input spectrum containing chans x win_s spectrum |
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| 61 | \param out output vector containing chans x nfilt output values |
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| 62 | |
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| 63 | */ |
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| 64 | void aubio_filterbank_do (aubio_filterbank_t * fb, cvec_t * in, fvec_t * out); |
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| 65 | |
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| 66 | /** return a pointer to the fvec object containing all filter coefficients |
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| 67 | |
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| 68 | \param f filterbank object to get coefficients from |
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| 69 | |
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| 70 | */ |
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| 71 | fvec_t *aubio_filterbank_get_coeffs (aubio_filterbank_t * f); |
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| 72 | |
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| 73 | /** copy filter coefficients to the filterbank |
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| 74 | |
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| 75 | \param f filterbank object to get coefficients from |
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| 76 | |
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| 77 | */ |
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| 78 | uint_t aubio_filterbank_set_coeffs (aubio_filterbank_t * f, fvec_t * filters); |
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| 79 | |
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| 80 | #ifdef __cplusplus |
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| 81 | } |
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| 82 | #endif |
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| 83 | |
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| 84 | #endif // FILTERBANK_H |
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