[96fb8ad] | 1 | /* |
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[a54502c] | 2 | Copyright (C) 2003-2009 Paul Brossier <piem@aubio.org> |
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[96fb8ad] | 3 | |
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[a54502c] | 4 | This file is part of aubio. |
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[96fb8ad] | 5 | |
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[a54502c] | 6 | aubio is free software: you can redistribute it and/or modify |
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| 7 | it under the terms of the GNU General Public License as published by |
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| 8 | the Free Software Foundation, either version 3 of the License, or |
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| 9 | (at your option) any later version. |
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[96fb8ad] | 10 | |
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[a54502c] | 11 | aubio is distributed in the hope that it will be useful, |
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 14 | GNU General Public License for more details. |
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| 15 | |
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| 16 | You should have received a copy of the GNU General Public License |
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| 17 | along with aubio. If not, see <http://www.gnu.org/licenses/>. |
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[96fb8ad] | 18 | |
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| 19 | */ |
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| 20 | |
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| 21 | |
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| 22 | /* Requires lsmp_t to be long or double. float will NOT give reliable |
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| 23 | * results */ |
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| 24 | |
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| 25 | #include "aubio_priv.h" |
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[6c7d49b] | 26 | #include "fvec.h" |
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[a7667ce] | 27 | #include "lvec.h" |
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[96fb8ad] | 28 | #include "mathutils.h" |
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[32d6958] | 29 | #include "temporal/filter.h" |
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[a4364b8] | 30 | |
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[a54502c] | 31 | struct _aubio_filter_t |
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| 32 | { |
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[a4364b8] | 33 | uint_t order; |
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| 34 | uint_t samplerate; |
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[a54502c] | 35 | lvec_t *a; |
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| 36 | lvec_t *b; |
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| 37 | lvec_t *y; |
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| 38 | lvec_t *x; |
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[a4364b8] | 39 | }; |
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[96fb8ad] | 40 | |
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[a54502c] | 41 | void |
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| 42 | aubio_filter_do_outplace (aubio_filter_t * f, fvec_t * in, fvec_t * out) |
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| 43 | { |
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| 44 | fvec_copy (in, out); |
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[6481c0c] | 45 | aubio_filter_do (f, out); |
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[96fb8ad] | 46 | } |
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| 47 | |
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[a54502c] | 48 | void |
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| 49 | aubio_filter_do (aubio_filter_t * f, fvec_t * in) |
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| 50 | { |
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| 51 | uint_t i, j, l, order = f->order; |
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[a7667ce] | 52 | lsmp_t *x; |
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| 53 | lsmp_t *y; |
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| 54 | lsmp_t *a = f->a->data[0]; |
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| 55 | lsmp_t *b = f->b->data[0]; |
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[96fb8ad] | 56 | |
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[a7667ce] | 57 | for (i = 0; i < in->channels; i++) { |
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| 58 | x = f->x->data[i]; |
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| 59 | y = f->y->data[i]; |
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| 60 | for (j = 0; j < in->length; j++) { |
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| 61 | /* new input */ |
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[a54502c] | 62 | x[0] = KILL_DENORMAL (in->data[i][j]); |
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[6481c0c] | 63 | y[0] = b[0] * x[0]; |
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[a54502c] | 64 | for (l = 1; l < order; l++) { |
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[6481c0c] | 65 | y[0] += b[l] * x[l]; |
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| 66 | y[0] -= a[l] * y[l]; |
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[a7667ce] | 67 | } |
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| 68 | /* new output */ |
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[6481c0c] | 69 | in->data[i][j] = y[0]; |
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[a7667ce] | 70 | /* store for next sample */ |
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[a54502c] | 71 | for (l = order - 1; l > 0; l--) { |
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| 72 | x[l] = x[l - 1]; |
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| 73 | y[l] = y[l - 1]; |
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[a7667ce] | 74 | } |
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[96fb8ad] | 75 | } |
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[a7667ce] | 76 | /* store for next run */ |
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| 77 | f->x->data[i] = x; |
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| 78 | f->y->data[i] = y; |
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[96fb8ad] | 79 | } |
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| 80 | } |
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| 81 | |
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[3f99693] | 82 | /* The rough way: reset memory of filter between each run to avoid end effects. */ |
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[96fb8ad] | 83 | void aubio_filter_do_filtfilt(aubio_filter_t * f, fvec_t * in, fvec_t * tmp) { |
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| 84 | uint_t j,i=0; |
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| 85 | uint_t length = in->length; |
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| 86 | /* apply filtering */ |
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| 87 | aubio_filter_do(f,in); |
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[3f99693] | 88 | aubio_filter_do_reset(f); |
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| 89 | /* mirror */ |
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[96fb8ad] | 90 | for (j = 0; j < length; j++) |
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| 91 | tmp->data[i][length-j-1] = in->data[i][j]; |
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[3f99693] | 92 | /* apply filtering on mirrored */ |
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[96fb8ad] | 93 | aubio_filter_do(f,tmp); |
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[3f99693] | 94 | aubio_filter_do_reset(f); |
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[96fb8ad] | 95 | /* invert back */ |
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| 96 | for (j = 0; j < length; j++) |
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| 97 | in->data[i][j] = tmp->data[i][length-j-1]; |
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| 98 | } |
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| 99 | |
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[a54502c] | 100 | lvec_t * |
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| 101 | aubio_filter_get_feedback (aubio_filter_t * f) |
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| 102 | { |
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[a4364b8] | 103 | return f->a; |
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| 104 | } |
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| 105 | |
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[a54502c] | 106 | lvec_t * |
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| 107 | aubio_filter_get_feedforward (aubio_filter_t * f) |
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| 108 | { |
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[a4364b8] | 109 | return f->b; |
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| 110 | } |
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| 111 | |
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[a54502c] | 112 | uint_t |
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| 113 | aubio_filter_get_order (aubio_filter_t * f) |
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| 114 | { |
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[a4364b8] | 115 | return f->order; |
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| 116 | } |
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| 117 | |
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[a54502c] | 118 | uint_t |
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| 119 | aubio_filter_get_samplerate (aubio_filter_t * f) |
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| 120 | { |
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[a4364b8] | 121 | return f->samplerate; |
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| 122 | } |
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| 123 | |
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[59c046d] | 124 | uint_t |
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| 125 | aubio_filter_set_samplerate (aubio_filter_t * f, uint_t samplerate) |
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| 126 | { |
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| 127 | f->samplerate = samplerate; |
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| 128 | return AUBIO_OK; |
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| 129 | } |
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| 130 | |
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[3f99693] | 131 | void |
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| 132 | aubio_filter_do_reset (aubio_filter_t * f) |
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| 133 | { |
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| 134 | lvec_zeros(f->x); |
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| 135 | lvec_zeros(f->y); |
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| 136 | } |
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| 137 | |
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[a54502c] | 138 | aubio_filter_t * |
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[59c046d] | 139 | new_aubio_filter (uint_t order, uint_t channels) |
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[a54502c] | 140 | { |
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| 141 | aubio_filter_t *f = AUBIO_NEW (aubio_filter_t); |
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| 142 | f->x = new_lvec (order, channels); |
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| 143 | f->y = new_lvec (order, channels); |
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| 144 | f->a = new_lvec (order, 1); |
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| 145 | f->b = new_lvec (order, 1); |
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[59c046d] | 146 | /* by default, samplerate is not set */ |
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| 147 | f->samplerate = 0; |
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[96fb8ad] | 148 | f->order = order; |
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[a4364b8] | 149 | /* set default to identity */ |
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| 150 | f->a->data[0][1] = 1.; |
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[96fb8ad] | 151 | return f; |
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| 152 | } |
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| 153 | |
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[a54502c] | 154 | void |
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| 155 | del_aubio_filter (aubio_filter_t * f) |
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| 156 | { |
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| 157 | del_lvec (f->a); |
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| 158 | del_lvec (f->b); |
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| 159 | del_lvec (f->x); |
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| 160 | del_lvec (f->y); |
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| 161 | AUBIO_FREE (f); |
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[bb20f87] | 162 | return; |
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| 163 | } |
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