[96fb8ad] | 1 | /* |
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[a6db140] | 2 | Copyright (C) 2003-2009 Paul Brossier <piem@aubio.org> |
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[96fb8ad] | 3 | |
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[a6db140] | 4 | This file is part of aubio. |
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[96fb8ad] | 5 | |
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[a6db140] | 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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[a6db140] | 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 | /* see in mathutils.h for doc */ |
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| 22 | |
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| 23 | #include "aubio_priv.h" |
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[6c7d49b] | 24 | #include "fvec.h" |
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[96fb8ad] | 25 | #include "mathutils.h" |
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[714380d] | 26 | #include "config.h" |
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[96fb8ad] | 27 | |
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[407bba9] | 28 | |
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| 29 | /** Window types */ |
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| 30 | typedef enum |
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| 31 | { |
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| 32 | aubio_win_rectangle, |
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| 33 | aubio_win_hamming, |
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| 34 | aubio_win_hanning, |
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| 35 | aubio_win_hanningz, |
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| 36 | aubio_win_blackman, |
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| 37 | aubio_win_blackman_harris, |
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| 38 | aubio_win_gaussian, |
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| 39 | aubio_win_welch, |
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| 40 | aubio_win_parzen, |
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| 41 | aubio_win_default = aubio_win_hanningz, |
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| 42 | } aubio_window_type; |
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| 43 | |
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[eb7f743] | 44 | fvec_t * |
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[407bba9] | 45 | new_aubio_window (char_t * window_type, uint_t size) |
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[eb7f743] | 46 | { |
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[d84d19e] | 47 | // create fvec of size x 1 channel |
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| 48 | fvec_t * win = new_fvec( size, 1); |
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| 49 | smpl_t * w = win->data[0]; |
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[96fb8ad] | 50 | uint_t i; |
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[407bba9] | 51 | aubio_window_type wintype; |
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| 52 | if (strcmp (window_type, "rectangle") == 0) |
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| 53 | wintype = aubio_win_rectangle; |
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| 54 | else if (strcmp (window_type, "hamming") == 0) |
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| 55 | wintype = aubio_win_hamming; |
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| 56 | else if (strcmp (window_type, "hanning") == 0) |
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| 57 | wintype = aubio_win_hanning; |
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| 58 | else if (strcmp (window_type, "hanningz") == 0) |
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| 59 | wintype = aubio_win_hanningz; |
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| 60 | else if (strcmp (window_type, "blackman") == 0) |
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| 61 | wintype = aubio_win_blackman; |
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| 62 | else if (strcmp (window_type, "blackman_harris") == 0) |
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| 63 | wintype = aubio_win_blackman_harris; |
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| 64 | else if (strcmp (window_type, "gaussian") == 0) |
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| 65 | wintype = aubio_win_gaussian; |
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| 66 | else if (strcmp (window_type, "welch") == 0) |
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| 67 | wintype = aubio_win_welch; |
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| 68 | else if (strcmp (window_type, "parzen") == 0) |
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| 69 | wintype = aubio_win_parzen; |
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| 70 | else if (strcmp (window_type, "default") == 0) |
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| 71 | wintype = aubio_win_default; |
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| 72 | else { |
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| 73 | AUBIO_ERR ("unknown window type %s, using default.\n", window_type); |
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| 74 | wintype = aubio_win_default; |
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| 75 | return NULL; |
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| 76 | } |
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[96fb8ad] | 77 | switch(wintype) { |
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[b4b0324] | 78 | case aubio_win_rectangle: |
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[96fb8ad] | 79 | for (i=0;i<size;i++) |
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[ade9afe] | 80 | w[i] = 0.5; |
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[96fb8ad] | 81 | break; |
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[b4b0324] | 82 | case aubio_win_hamming: |
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[96fb8ad] | 83 | for (i=0;i<size;i++) |
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| 84 | w[i] = 0.54 - 0.46 * COS(TWO_PI * i / (size)); |
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| 85 | break; |
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[b4b0324] | 86 | case aubio_win_hanning: |
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[96fb8ad] | 87 | for (i=0;i<size;i++) |
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| 88 | w[i] = 0.5 - (0.5 * COS(TWO_PI * i / (size))); |
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| 89 | break; |
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[b4b0324] | 90 | case aubio_win_hanningz: |
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[96fb8ad] | 91 | for (i=0;i<size;i++) |
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| 92 | w[i] = 0.5 * (1.0 - COS(TWO_PI * i / (size))); |
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| 93 | break; |
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[b4b0324] | 94 | case aubio_win_blackman: |
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[96fb8ad] | 95 | for (i=0;i<size;i++) |
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| 96 | w[i] = 0.42 |
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| 97 | - 0.50 * COS( TWO_PI*i/(size-1.0)) |
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[ade9afe] | 98 | + 0.08 * COS(2.0*TWO_PI*i/(size-1.0)); |
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[96fb8ad] | 99 | break; |
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[b4b0324] | 100 | case aubio_win_blackman_harris: |
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[96fb8ad] | 101 | for (i=0;i<size;i++) |
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[ade9afe] | 102 | w[i] = 0.35875 |
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[96fb8ad] | 103 | - 0.48829 * COS( TWO_PI*i/(size-1.0)) |
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| 104 | + 0.14128 * COS(2.0*TWO_PI*i/(size-1.0)) |
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| 105 | - 0.01168 * COS(3.0*TWO_PI*i/(size-1.0)); |
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| 106 | break; |
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[b4b0324] | 107 | case aubio_win_gaussian: |
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[96fb8ad] | 108 | for (i=0;i<size;i++) |
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| 109 | w[i] = EXP(- 1.0 / SQR(size) * SQR(2.0*i-size)); |
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| 110 | break; |
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[b4b0324] | 111 | case aubio_win_welch: |
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[96fb8ad] | 112 | for (i=0;i<size;i++) |
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| 113 | w[i] = 1.0 - SQR((2*i-size)/(size+1.0)); |
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| 114 | break; |
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[b4b0324] | 115 | case aubio_win_parzen: |
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[96fb8ad] | 116 | for (i=0;i<size;i++) |
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[8f70a18] | 117 | w[i] = 1.0 - ABS((2*i-size)/(size+1.0)); |
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[96fb8ad] | 118 | break; |
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| 119 | default: |
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| 120 | break; |
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| 121 | } |
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[d84d19e] | 122 | return win; |
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[96fb8ad] | 123 | } |
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| 124 | |
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[eb7f743] | 125 | smpl_t |
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| 126 | aubio_unwrap2pi (smpl_t phase) |
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| 127 | { |
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[96fb8ad] | 128 | /* mod(phase+pi,-2pi)+pi */ |
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[eb7f743] | 129 | return phase + TWO_PI * (1. + FLOOR (-(phase + PI) / TWO_PI)); |
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[96fb8ad] | 130 | } |
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| 131 | |
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[eb7f743] | 132 | smpl_t |
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| 133 | fvec_mean (fvec_t * s) |
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| 134 | { |
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| 135 | uint_t i, j; |
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[acf7d30] | 136 | smpl_t tmp = 0.0; |
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[eb7f743] | 137 | for (i = 0; i < s->channels; i++) |
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| 138 | for (j = 0; j < s->length; j++) |
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[96fb8ad] | 139 | tmp += s->data[i][j]; |
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[eb7f743] | 140 | return tmp / (smpl_t) (s->length); |
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[96fb8ad] | 141 | } |
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| 142 | |
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[eb7f743] | 143 | smpl_t |
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| 144 | fvec_sum (fvec_t * s) |
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| 145 | { |
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| 146 | uint_t i, j; |
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[acf7d30] | 147 | smpl_t tmp = 0.0; |
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[eb7f743] | 148 | for (i = 0; i < s->channels; i++) { |
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| 149 | for (j = 0; j < s->length; j++) { |
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[96fb8ad] | 150 | tmp += s->data[i][j]; |
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[eb7f743] | 151 | } |
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| 152 | } |
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[96fb8ad] | 153 | return tmp; |
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| 154 | } |
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| 155 | |
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[eb7f743] | 156 | smpl_t |
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| 157 | fvec_max (fvec_t * s) |
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| 158 | { |
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| 159 | uint_t i, j; |
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[acf7d30] | 160 | smpl_t tmp = 0.0; |
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[eb7f743] | 161 | for (i = 0; i < s->channels; i++) { |
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| 162 | for (j = 0; j < s->length; j++) { |
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| 163 | tmp = (tmp > s->data[i][j]) ? tmp : s->data[i][j]; |
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| 164 | } |
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| 165 | } |
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[96fb8ad] | 166 | return tmp; |
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| 167 | } |
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| 168 | |
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[eb7f743] | 169 | smpl_t |
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| 170 | fvec_min (fvec_t * s) |
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| 171 | { |
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| 172 | uint_t i, j; |
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[96fb8ad] | 173 | smpl_t tmp = s->data[0][0]; |
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[eb7f743] | 174 | for (i = 0; i < s->channels; i++) { |
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| 175 | for (j = 0; j < s->length; j++) { |
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| 176 | tmp = (tmp < s->data[i][j]) ? tmp : s->data[i][j]; |
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| 177 | } |
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| 178 | } |
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[96fb8ad] | 179 | return tmp; |
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| 180 | } |
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| 181 | |
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[eb7f743] | 182 | uint_t |
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| 183 | fvec_min_elem (fvec_t * s) |
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| 184 | { |
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[41f4c5b] | 185 | uint_t i, j, pos = 0.; |
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[96fb8ad] | 186 | smpl_t tmp = s->data[0][0]; |
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[eb7f743] | 187 | for (i = 0; i < s->channels; i++) { |
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| 188 | for (j = 0; j < s->length; j++) { |
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| 189 | pos = (tmp < s->data[i][j]) ? pos : j; |
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| 190 | tmp = (tmp < s->data[i][j]) ? tmp : s->data[i][j]; |
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[96fb8ad] | 191 | } |
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[eb7f743] | 192 | } |
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[96fb8ad] | 193 | return pos; |
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| 194 | } |
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| 195 | |
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[eb7f743] | 196 | uint_t |
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| 197 | fvec_max_elem (fvec_t * s) |
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| 198 | { |
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[41f4c5b] | 199 | uint_t i, j, pos = 0; |
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[acf7d30] | 200 | smpl_t tmp = 0.0; |
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[eb7f743] | 201 | for (i = 0; i < s->channels; i++) { |
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| 202 | for (j = 0; j < s->length; j++) { |
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| 203 | pos = (tmp > s->data[i][j]) ? pos : j; |
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| 204 | tmp = (tmp > s->data[i][j]) ? tmp : s->data[i][j]; |
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[96fb8ad] | 205 | } |
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[eb7f743] | 206 | } |
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[96fb8ad] | 207 | return pos; |
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| 208 | } |
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| 209 | |
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[eb7f743] | 210 | void |
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| 211 | fvec_shift (fvec_t * s) |
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| 212 | { |
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| 213 | uint_t i, j; |
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| 214 | for (i = 0; i < s->channels; i++) { |
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| 215 | for (j = 0; j < s->length / 2; j++) { |
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| 216 | ELEM_SWAP (s->data[i][j], s->data[i][j + s->length / 2]); |
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[96fb8ad] | 217 | } |
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[eb7f743] | 218 | } |
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[96fb8ad] | 219 | } |
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| 220 | |
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[eb7f743] | 221 | smpl_t |
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| 222 | fvec_local_energy (fvec_t * f) |
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| 223 | { |
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| 224 | smpl_t energy = 0.; |
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| 225 | uint_t i, j; |
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| 226 | for (i = 0; i < f->channels; i++) { |
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| 227 | for (j = 0; j < f->length; j++) { |
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| 228 | energy += SQR (f->data[i][j]); |
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| 229 | } |
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| 230 | } |
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| 231 | return energy; |
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[96fb8ad] | 232 | } |
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| 233 | |
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[eb7f743] | 234 | smpl_t |
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| 235 | fvec_local_hfc (fvec_t * v) |
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| 236 | { |
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| 237 | smpl_t hfc = 0.; |
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| 238 | uint_t i, j; |
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| 239 | for (i = 0; i < v->channels; i++) { |
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| 240 | for (j = 0; j < v->length; j++) { |
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| 241 | hfc += (i + 1) * v->data[i][j]; |
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| 242 | } |
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| 243 | } |
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| 244 | return hfc; |
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[96fb8ad] | 245 | } |
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| 246 | |
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[eb7f743] | 247 | void |
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| 248 | fvec_min_removal (fvec_t * v) |
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| 249 | { |
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| 250 | smpl_t v_min = fvec_min (v); |
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| 251 | fvec_add (v, - v_min ); |
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[96fb8ad] | 252 | } |
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| 253 | |
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[eb7f743] | 254 | smpl_t |
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| 255 | fvec_alpha_norm (fvec_t * o, smpl_t alpha) |
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[c0b295c] | 256 | { |
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| 257 | uint_t i, j; |
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[eb7f743] | 258 | smpl_t tmp = 0.; |
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[c0b295c] | 259 | for (i = 0; i < o->channels; i++) { |
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| 260 | for (j = 0; j < o->length; j++) { |
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[eb7f743] | 261 | tmp += POW (ABS (o->data[i][j]), alpha); |
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[96fb8ad] | 262 | } |
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[c0b295c] | 263 | } |
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[eb7f743] | 264 | return POW (tmp / o->length, 1. / alpha); |
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[96fb8ad] | 265 | } |
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| 266 | |
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[eb7f743] | 267 | void |
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| 268 | fvec_alpha_normalise (fvec_t * o, smpl_t alpha) |
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| 269 | { |
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| 270 | uint_t i, j; |
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| 271 | smpl_t norm = fvec_alpha_norm (o, alpha); |
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| 272 | for (i = 0; i < o->channels; i++) { |
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| 273 | for (j = 0; j < o->length; j++) { |
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| 274 | o->data[i][j] /= norm; |
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| 275 | } |
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[96fb8ad] | 276 | } |
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| 277 | } |
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| 278 | |
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[eb7f743] | 279 | void |
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| 280 | fvec_add (fvec_t * o, smpl_t val) |
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| 281 | { |
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| 282 | uint_t i, j; |
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| 283 | for (i = 0; i < o->channels; i++) { |
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| 284 | for (j = 0; j < o->length; j++) { |
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| 285 | o->data[i][j] += val; |
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| 286 | } |
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[96fb8ad] | 287 | } |
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| 288 | } |
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| 289 | |
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[5c4ec3c] | 290 | void fvec_adapt_thres(fvec_t * vec, fvec_t * tmp, |
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[ade9afe] | 291 | uint_t post, uint_t pre) { |
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[96fb8ad] | 292 | uint_t length = vec->length, i=0, j; |
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| 293 | for (j=0;j<length;j++) { |
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[5c4ec3c] | 294 | vec->data[i][j] -= fvec_moving_thres(vec, tmp, post, pre, j); |
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[96fb8ad] | 295 | } |
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| 296 | } |
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| 297 | |
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[eb7f743] | 298 | smpl_t |
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| 299 | fvec_moving_thres (fvec_t * vec, fvec_t * tmpvec, |
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| 300 | uint_t post, uint_t pre, uint_t pos) |
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| 301 | { |
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| 302 | smpl_t *medar = (smpl_t *) tmpvec->data[0]; |
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[96fb8ad] | 303 | uint_t k; |
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[eb7f743] | 304 | uint_t win_length = post + pre + 1; |
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| 305 | uint_t length = vec->length; |
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[96fb8ad] | 306 | /* post part of the buffer does not exist */ |
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[eb7f743] | 307 | if (pos < post + 1) { |
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| 308 | for (k = 0; k < post + 1 - pos; k++) |
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| 309 | medar[k] = 0.; /* 0-padding at the beginning */ |
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| 310 | for (k = post + 1 - pos; k < win_length; k++) |
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| 311 | medar[k] = vec->data[0][k + pos - post]; |
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| 312 | /* the buffer is fully defined */ |
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| 313 | } else if (pos + pre < length) { |
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| 314 | for (k = 0; k < win_length; k++) |
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| 315 | medar[k] = vec->data[0][k + pos - post]; |
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| 316 | /* pre part of the buffer does not exist */ |
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[96fb8ad] | 317 | } else { |
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[eb7f743] | 318 | for (k = 0; k < length - pos + post; k++) |
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| 319 | medar[k] = vec->data[0][k + pos - post]; |
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| 320 | for (k = length - pos + post; k < win_length; k++) |
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| 321 | medar[k] = 0.; /* 0-padding at the end */ |
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[ade9afe] | 322 | } |
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[eb7f743] | 323 | return fvec_median (tmpvec); |
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[96fb8ad] | 324 | } |
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| 325 | |
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[5c4ec3c] | 326 | smpl_t fvec_median(fvec_t * input) { |
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[96fb8ad] | 327 | uint_t n = input->length; |
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| 328 | smpl_t * arr = (smpl_t *) input->data[0]; |
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| 329 | uint_t low, high ; |
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| 330 | uint_t median; |
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| 331 | uint_t middle, ll, hh; |
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| 332 | |
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| 333 | low = 0 ; high = n-1 ; median = (low + high) / 2; |
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| 334 | for (;;) { |
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| 335 | if (high <= low) /* One element only */ |
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| 336 | return arr[median] ; |
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| 337 | |
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| 338 | if (high == low + 1) { /* Two elements only */ |
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| 339 | if (arr[low] > arr[high]) |
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| 340 | ELEM_SWAP(arr[low], arr[high]) ; |
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| 341 | return arr[median] ; |
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| 342 | } |
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| 343 | |
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| 344 | /* Find median of low, middle and high items; swap into position low */ |
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| 345 | middle = (low + high) / 2; |
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| 346 | if (arr[middle] > arr[high]) ELEM_SWAP(arr[middle], arr[high]); |
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| 347 | if (arr[low] > arr[high]) ELEM_SWAP(arr[low], arr[high]); |
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| 348 | if (arr[middle] > arr[low]) ELEM_SWAP(arr[middle], arr[low]) ; |
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| 349 | |
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| 350 | /* Swap low item (now in position middle) into position (low+1) */ |
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| 351 | ELEM_SWAP(arr[middle], arr[low+1]) ; |
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| 352 | |
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| 353 | /* Nibble from each end towards middle, swapping items when stuck */ |
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| 354 | ll = low + 1; |
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| 355 | hh = high; |
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| 356 | for (;;) { |
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| 357 | do ll++; while (arr[low] > arr[ll]) ; |
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| 358 | do hh--; while (arr[hh] > arr[low]) ; |
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| 359 | |
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| 360 | if (hh < ll) |
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| 361 | break; |
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| 362 | |
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| 363 | ELEM_SWAP(arr[ll], arr[hh]) ; |
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| 364 | } |
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| 365 | |
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| 366 | /* Swap middle item (in position low) back into correct position */ |
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| 367 | ELEM_SWAP(arr[low], arr[hh]) ; |
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| 368 | |
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| 369 | /* Re-set active partition */ |
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| 370 | if (hh <= median) |
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| 371 | low = ll; |
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| 372 | if (hh >= median) |
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| 373 | high = hh - 1; |
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| 374 | } |
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| 375 | } |
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| 376 | |
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[5c4ec3c] | 377 | smpl_t fvec_quadint(fvec_t * x,uint_t pos, uint_t span) { |
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[c5c0c98] | 378 | smpl_t s0, s1, s2; |
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| 379 | uint_t x0 = (pos < span) ? pos : pos - span; |
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| 380 | uint_t x2 = (pos + span < x->length) ? pos + span : pos; |
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| 381 | if (x0 == pos) return (x->data[0][pos] <= x->data[0][x2]) ? pos : x2; |
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| 382 | if (x2 == pos) return (x->data[0][pos] <= x->data[0][x0]) ? pos : x0; |
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| 383 | s0 = x->data[0][x0]; |
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[eb7f743] | 384 | s1 = x->data[0][pos]; |
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[c5c0c98] | 385 | s2 = x->data[0][x2]; |
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| 386 | return pos + 0.5 * (s2 - s0 ) / (s2 - 2.* s1 + s0); |
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[9771488] | 387 | } |
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| 388 | |
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[5c4ec3c] | 389 | uint_t fvec_peakpick(fvec_t * onset, uint_t pos) { |
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[ade9afe] | 390 | uint_t i=0, tmp=0; |
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| 391 | /*for (i=0;i<onset->channels;i++)*/ |
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| 392 | tmp = (onset->data[i][pos] > onset->data[i][pos-1] |
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| 393 | && onset->data[i][pos] > onset->data[i][pos+1] |
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| 394 | && onset->data[i][pos] > 0.); |
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| 395 | return tmp; |
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[96fb8ad] | 396 | } |
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| 397 | |
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[eb7f743] | 398 | smpl_t |
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| 399 | aubio_quadfrac (smpl_t s0, smpl_t s1, smpl_t s2, smpl_t pf) |
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| 400 | { |
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| 401 | smpl_t tmp = |
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| 402 | s0 + (pf / 2.) * (pf * (s0 - 2. * s1 + s2) - 3. * s0 + 4. * s1 - s2); |
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| 403 | return tmp; |
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| 404 | } |
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| 405 | |
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| 406 | smpl_t |
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| 407 | aubio_freqtomidi (smpl_t freq) |
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| 408 | { |
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[ade9afe] | 409 | /* log(freq/A-2)/log(2) */ |
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[eb7f743] | 410 | smpl_t midi = freq / 6.875; |
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| 411 | midi = LOG (midi) / 0.69314718055995; |
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[ade9afe] | 412 | midi *= 12; |
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| 413 | midi -= 3; |
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| 414 | return midi; |
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[79c2e52] | 415 | } |
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| 416 | |
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[eb7f743] | 417 | smpl_t |
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| 418 | aubio_miditofreq (smpl_t midi) |
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| 419 | { |
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| 420 | smpl_t freq = (midi + 3.) / 12.; |
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| 421 | freq = EXP (freq * 0.69314718055995); |
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[ade9afe] | 422 | freq *= 6.875; |
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| 423 | return freq; |
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[96fb8ad] | 424 | } |
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| 425 | |
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[eb7f743] | 426 | smpl_t |
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| 427 | aubio_bintofreq (smpl_t bin, smpl_t samplerate, smpl_t fftsize) |
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| 428 | { |
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| 429 | smpl_t freq = samplerate / fftsize; |
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| 430 | return freq * bin; |
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[96fb8ad] | 431 | } |
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| 432 | |
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[eb7f743] | 433 | smpl_t |
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| 434 | aubio_bintomidi (smpl_t bin, smpl_t samplerate, smpl_t fftsize) |
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| 435 | { |
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| 436 | smpl_t midi = aubio_bintofreq (bin, samplerate, fftsize); |
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| 437 | return aubio_freqtomidi (midi); |
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[96fb8ad] | 438 | } |
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| 439 | |
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[eb7f743] | 440 | smpl_t |
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| 441 | aubio_freqtobin (smpl_t freq, smpl_t samplerate, smpl_t fftsize) |
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| 442 | { |
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| 443 | smpl_t bin = fftsize / samplerate; |
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| 444 | return freq * bin; |
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[79c2e52] | 445 | } |
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| 446 | |
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[eb7f743] | 447 | smpl_t |
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| 448 | aubio_miditobin (smpl_t midi, smpl_t samplerate, smpl_t fftsize) |
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| 449 | { |
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| 450 | smpl_t freq = aubio_miditofreq (midi); |
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| 451 | return aubio_freqtobin (freq, samplerate, fftsize); |
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[79c2e52] | 452 | } |
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| 453 | |
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[10a5413] | 454 | uint_t |
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[41f4c5b] | 455 | aubio_is_power_of_two (uint_t a) |
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| 456 | { |
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| 457 | if ((a & (a - 1)) == 0) { |
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[10a5413] | 458 | return 1; |
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| 459 | } else { |
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[41f4c5b] | 460 | return 0; |
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[10a5413] | 461 | } |
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| 462 | } |
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| 463 | |
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| 464 | uint_t |
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[41f4c5b] | 465 | aubio_next_power_of_two (uint_t a) |
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| 466 | { |
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[10a5413] | 467 | uint_t i; |
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| 468 | a--; |
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[41f4c5b] | 469 | for (i = 0; i < sizeof (uint_t) * CHAR_BIT; i++) { |
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[10a5413] | 470 | a = a | a >> 1; |
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| 471 | } |
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[41f4c5b] | 472 | return a + 1; |
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[10a5413] | 473 | } |
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| 474 | |
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[eb7f743] | 475 | smpl_t |
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| 476 | aubio_db_spl (fvec_t * o) |
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| 477 | { |
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| 478 | smpl_t val = SQRT (fvec_local_energy (o)); |
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| 479 | val /= (smpl_t) o->length; |
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| 480 | return LIN2DB (val); |
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[96fb8ad] | 481 | } |
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| 482 | |
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[eb7f743] | 483 | uint_t |
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| 484 | aubio_silence_detection (fvec_t * o, smpl_t threshold) |
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| 485 | { |
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| 486 | return (aubio_db_spl (o) < threshold); |
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| 487 | } |
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[96fb8ad] | 488 | |
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[eb7f743] | 489 | smpl_t |
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| 490 | aubio_level_detection (fvec_t * o, smpl_t threshold) |
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| 491 | { |
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| 492 | smpl_t db_spl = aubio_db_spl (o); |
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| 493 | if (db_spl < threshold) { |
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[ade9afe] | 494 | return 1.; |
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[eb7f743] | 495 | } else { |
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| 496 | return db_spl; |
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| 497 | } |
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[96fb8ad] | 498 | } |
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[a0fd4e4] | 499 | |
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[eb7f743] | 500 | smpl_t |
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| 501 | aubio_zero_crossing_rate (fvec_t * input) |
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| 502 | { |
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| 503 | uint_t i = 0, j; |
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[fff2bee] | 504 | uint_t zcr = 0; |
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[eb7f743] | 505 | for (j = 1; j < input->length; j++) { |
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[7e204d01] | 506 | // previous was strictly negative |
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[eb7f743] | 507 | if (input->data[i][j - 1] < 0.) { |
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[7e204d01] | 508 | // current is positive or null |
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[eb7f743] | 509 | if (input->data[i][j] >= 0.) { |
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[7e204d01] | 510 | zcr += 1; |
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| 511 | } |
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[eb7f743] | 512 | // previous was positive or null |
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[7e204d01] | 513 | } else { |
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| 514 | // current is strictly negative |
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[eb7f743] | 515 | if (input->data[i][j] < 0.) { |
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[fff2bee] | 516 | zcr += 1; |
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| 517 | } |
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| 518 | } |
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| 519 | } |
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[eb7f743] | 520 | return zcr / (smpl_t) input->length; |
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[fff2bee] | 521 | } |
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| 522 | |
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[eb7f743] | 523 | void |
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| 524 | aubio_autocorr (fvec_t * input, fvec_t * output) |
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| 525 | { |
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| 526 | uint_t i, j, k, length = input->length; |
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| 527 | smpl_t *data, *acf; |
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| 528 | smpl_t tmp = 0; |
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| 529 | for (k = 0; k < input->channels; k++) { |
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| 530 | data = input->data[k]; |
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| 531 | acf = output->data[k]; |
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| 532 | for (i = 0; i < length; i++) { |
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| 533 | tmp = 0.; |
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| 534 | for (j = i; j < length; j++) { |
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| 535 | tmp += data[j - i] * data[j]; |
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| 536 | } |
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| 537 | acf[i] = tmp / (smpl_t) (length - i); |
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[ade9afe] | 538 | } |
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| 539 | } |
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[a0fd4e4] | 540 | } |
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| 541 | |
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[eb7f743] | 542 | void |
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| 543 | aubio_cleanup (void) |
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| 544 | { |
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[b511fa9] | 545 | #if HAVE_FFTW3 |
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[eb7f743] | 546 | fftw_cleanup (); |
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[714380d] | 547 | #else |
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[b511fa9] | 548 | #if HAVE_FFTW3F |
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[eb7f743] | 549 | fftwf_cleanup (); |
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[714380d] | 550 | #endif |
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| 551 | #endif |
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| 552 | } |
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