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 | #include "aubio_priv.h" |
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23 | #include "fvec.h" |
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24 | #include "fmat.h" |
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25 | #include "cvec.h" |
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26 | #include "vecutils.h" |
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27 | #include "spectral/filterbank.h" |
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28 | #include "mathutils.h" |
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29 | |
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30 | /** \brief A structure to store a set of n_filters filters of lenghts win_s */ |
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31 | struct _aubio_filterbank_t |
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32 | { |
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33 | uint_t win_s; |
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34 | uint_t n_filters; |
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35 | fmat_t *filters; |
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36 | smpl_t norm; |
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37 | smpl_t power; |
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38 | }; |
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39 | |
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40 | aubio_filterbank_t * |
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41 | new_aubio_filterbank (uint_t n_filters, uint_t win_s) |
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42 | { |
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43 | /* allocate space for filterbank object */ |
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44 | aubio_filterbank_t *fb = AUBIO_NEW (aubio_filterbank_t); |
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45 | fb->win_s = win_s; |
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46 | fb->n_filters = n_filters; |
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47 | |
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48 | /* allocate filter tables, a matrix of length win_s and of height n_filters */ |
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49 | fb->filters = new_fmat (n_filters, win_s / 2 + 1); |
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50 | |
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51 | fb->norm = 1; |
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52 | |
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53 | fb->power = 1; |
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54 | |
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55 | return fb; |
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56 | } |
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57 | |
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58 | void |
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59 | del_aubio_filterbank (aubio_filterbank_t * fb) |
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60 | { |
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61 | del_fmat (fb->filters); |
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62 | AUBIO_FREE (fb); |
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63 | } |
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64 | |
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65 | void |
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66 | aubio_filterbank_do (aubio_filterbank_t * f, const cvec_t * in, fvec_t * out) |
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67 | { |
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68 | /* apply filter to all input channel, provided out has enough channels */ |
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69 | //uint_t max_filters = MIN (f->n_filters, out->length); |
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70 | //uint_t max_length = MIN (in->length, f->filters->length); |
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71 | |
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72 | // view cvec->norm as fvec->data |
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73 | fvec_t tmp; |
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74 | tmp.length = in->length; |
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75 | tmp.data = in->norm; |
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76 | |
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77 | if (f->power != 1.) fvec_pow(&tmp, f->power); |
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78 | |
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79 | fmat_vecmul(f->filters, &tmp, out); |
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80 | |
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81 | return; |
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82 | } |
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83 | |
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84 | fmat_t * |
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85 | aubio_filterbank_get_coeffs (const aubio_filterbank_t * f) |
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86 | { |
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87 | return f->filters; |
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88 | } |
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89 | |
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90 | uint_t |
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91 | aubio_filterbank_set_coeffs (aubio_filterbank_t * f, const fmat_t * filter_coeffs) |
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92 | { |
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93 | fmat_copy(filter_coeffs, f->filters); |
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94 | return 0; |
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95 | } |
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96 | |
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97 | uint_t |
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98 | aubio_filterbank_set_norm (aubio_filterbank_t *f, smpl_t norm) |
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99 | { |
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100 | if (norm != 0 && norm != 1) return AUBIO_FAIL; |
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101 | f->norm = norm; |
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102 | return AUBIO_OK; |
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103 | } |
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104 | |
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105 | smpl_t |
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106 | aubio_filterbank_get_norm (aubio_filterbank_t *f) |
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107 | { |
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108 | return f->norm; |
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109 | } |
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110 | |
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111 | uint_t |
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112 | aubio_filterbank_set_power (aubio_filterbank_t *f, smpl_t power) |
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113 | { |
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114 | f->power = power; |
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115 | return AUBIO_OK; |
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116 | } |
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117 | |
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118 | smpl_t |
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119 | aubio_filterbank_get_power (aubio_filterbank_t *f) |
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120 | { |
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121 | return f->norm; |
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122 | } |
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