[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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[83963b3] | 26 | #include "musicutils.h" |
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[714380d] | 27 | #include "config.h" |
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[96fb8ad] | 28 | |
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[407bba9] | 29 | |
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| 30 | /** Window types */ |
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| 31 | typedef enum |
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| 32 | { |
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| 33 | aubio_win_rectangle, |
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| 34 | aubio_win_hamming, |
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| 35 | aubio_win_hanning, |
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| 36 | aubio_win_hanningz, |
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| 37 | aubio_win_blackman, |
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| 38 | aubio_win_blackman_harris, |
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| 39 | aubio_win_gaussian, |
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| 40 | aubio_win_welch, |
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| 41 | aubio_win_parzen, |
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| 42 | aubio_win_default = aubio_win_hanningz, |
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| 43 | } aubio_window_type; |
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| 44 | |
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[eb7f743] | 45 | fvec_t * |
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[407bba9] | 46 | new_aubio_window (char_t * window_type, uint_t size) |
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[eb7f743] | 47 | { |
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[8e5c051] | 48 | fvec_t * win = new_fvec (size); |
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| 49 | smpl_t * w = win->data; |
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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 | } |
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[96fb8ad] | 76 | switch(wintype) { |
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[b4b0324] | 77 | case aubio_win_rectangle: |
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[96fb8ad] | 78 | for (i=0;i<size;i++) |
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[ade9afe] | 79 | w[i] = 0.5; |
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[96fb8ad] | 80 | break; |
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[b4b0324] | 81 | case aubio_win_hamming: |
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[96fb8ad] | 82 | for (i=0;i<size;i++) |
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| 83 | w[i] = 0.54 - 0.46 * COS(TWO_PI * i / (size)); |
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| 84 | break; |
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[b4b0324] | 85 | case aubio_win_hanning: |
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[96fb8ad] | 86 | for (i=0;i<size;i++) |
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| 87 | w[i] = 0.5 - (0.5 * COS(TWO_PI * i / (size))); |
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| 88 | break; |
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[b4b0324] | 89 | case aubio_win_hanningz: |
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[96fb8ad] | 90 | for (i=0;i<size;i++) |
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| 91 | w[i] = 0.5 * (1.0 - COS(TWO_PI * i / (size))); |
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| 92 | break; |
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[b4b0324] | 93 | case aubio_win_blackman: |
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[96fb8ad] | 94 | for (i=0;i<size;i++) |
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| 95 | w[i] = 0.42 |
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| 96 | - 0.50 * COS( TWO_PI*i/(size-1.0)) |
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[ade9afe] | 97 | + 0.08 * COS(2.0*TWO_PI*i/(size-1.0)); |
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[96fb8ad] | 98 | break; |
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[b4b0324] | 99 | case aubio_win_blackman_harris: |
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[96fb8ad] | 100 | for (i=0;i<size;i++) |
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[ade9afe] | 101 | w[i] = 0.35875 |
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[96fb8ad] | 102 | - 0.48829 * COS( TWO_PI*i/(size-1.0)) |
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| 103 | + 0.14128 * COS(2.0*TWO_PI*i/(size-1.0)) |
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| 104 | - 0.01168 * COS(3.0*TWO_PI*i/(size-1.0)); |
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| 105 | break; |
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[b4b0324] | 106 | case aubio_win_gaussian: |
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[9e56228] | 107 | { |
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| 108 | lsmp_t a, b, c = 0.5; |
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| 109 | uint_t n; |
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| 110 | for (n = 0; n < size; n++) |
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| 111 | { |
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| 112 | a = (n-c*(size-1))/(SQR(c)*(size-1)); |
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| 113 | b = -c*SQR(a); |
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| 114 | w[n] = EXP(b); |
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| 115 | } |
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| 116 | } |
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[96fb8ad] | 117 | break; |
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[b4b0324] | 118 | case aubio_win_welch: |
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[96fb8ad] | 119 | for (i=0;i<size;i++) |
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[f9d5346] | 120 | w[i] = 1.0 - SQR((2.*i-size)/(size+1.0)); |
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[96fb8ad] | 121 | break; |
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[b4b0324] | 122 | case aubio_win_parzen: |
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[96fb8ad] | 123 | for (i=0;i<size;i++) |
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[f9d5346] | 124 | w[i] = 1.0 - ABS((2.*i-size)/(size+1.0)); |
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[96fb8ad] | 125 | break; |
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| 126 | default: |
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| 127 | break; |
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| 128 | } |
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[d84d19e] | 129 | return win; |
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[96fb8ad] | 130 | } |
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| 131 | |
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[eb7f743] | 132 | smpl_t |
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| 133 | aubio_unwrap2pi (smpl_t phase) |
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| 134 | { |
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[96fb8ad] | 135 | /* mod(phase+pi,-2pi)+pi */ |
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[eb7f743] | 136 | return phase + TWO_PI * (1. + FLOOR (-(phase + PI) / TWO_PI)); |
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[96fb8ad] | 137 | } |
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| 138 | |
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[eb7f743] | 139 | smpl_t |
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| 140 | fvec_mean (fvec_t * s) |
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| 141 | { |
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[56ef7e1] | 142 | uint_t j; |
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| 143 | smpl_t tmp = 0.0; |
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[8e5c051] | 144 | for (j = 0; j < s->length; j++) { |
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| 145 | tmp += s->data[j]; |
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| 146 | } |
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[56ef7e1] | 147 | return tmp / (smpl_t) (s->length); |
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| 148 | } |
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| 149 | |
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| 150 | smpl_t |
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[eb7f743] | 151 | fvec_sum (fvec_t * s) |
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| 152 | { |
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[8e5c051] | 153 | uint_t j; |
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[acf7d30] | 154 | smpl_t tmp = 0.0; |
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[8e5c051] | 155 | for (j = 0; j < s->length; j++) { |
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| 156 | tmp += s->data[j]; |
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[eb7f743] | 157 | } |
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[96fb8ad] | 158 | return tmp; |
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| 159 | } |
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| 160 | |
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[eb7f743] | 161 | smpl_t |
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| 162 | fvec_max (fvec_t * s) |
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| 163 | { |
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[8e5c051] | 164 | uint_t j; |
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[acf7d30] | 165 | smpl_t tmp = 0.0; |
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[8e5c051] | 166 | for (j = 0; j < s->length; j++) { |
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| 167 | tmp = (tmp > s->data[j]) ? tmp : s->data[j]; |
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[eb7f743] | 168 | } |
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[96fb8ad] | 169 | return tmp; |
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| 170 | } |
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| 171 | |
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[eb7f743] | 172 | smpl_t |
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| 173 | fvec_min (fvec_t * s) |
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| 174 | { |
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[8e5c051] | 175 | uint_t j; |
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| 176 | smpl_t tmp = s->data[0]; |
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| 177 | for (j = 0; j < s->length; j++) { |
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| 178 | tmp = (tmp < s->data[j]) ? tmp : s->data[j]; |
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[eb7f743] | 179 | } |
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[96fb8ad] | 180 | return tmp; |
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| 181 | } |
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| 182 | |
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[eb7f743] | 183 | uint_t |
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| 184 | fvec_min_elem (fvec_t * s) |
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| 185 | { |
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[8e5c051] | 186 | uint_t j, pos = 0.; |
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| 187 | smpl_t tmp = s->data[0]; |
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| 188 | for (j = 0; j < s->length; j++) { |
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| 189 | pos = (tmp < s->data[j]) ? pos : j; |
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| 190 | tmp = (tmp < s->data[j]) ? tmp : s->data[j]; |
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[eb7f743] | 191 | } |
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[96fb8ad] | 192 | return pos; |
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| 193 | } |
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| 194 | |
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[eb7f743] | 195 | uint_t |
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| 196 | fvec_max_elem (fvec_t * s) |
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| 197 | { |
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[8e5c051] | 198 | uint_t j, pos = 0; |
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[acf7d30] | 199 | smpl_t tmp = 0.0; |
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[8e5c051] | 200 | for (j = 0; j < s->length; j++) { |
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| 201 | pos = (tmp > s->data[j]) ? pos : j; |
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| 202 | tmp = (tmp > s->data[j]) ? tmp : s->data[j]; |
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[eb7f743] | 203 | } |
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[96fb8ad] | 204 | return pos; |
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| 205 | } |
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| 206 | |
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[eb7f743] | 207 | void |
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| 208 | fvec_shift (fvec_t * s) |
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| 209 | { |
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[8e5c051] | 210 | uint_t j; |
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| 211 | for (j = 0; j < s->length / 2; j++) { |
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| 212 | ELEM_SWAP (s->data[j], s->data[j + s->length / 2]); |
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[eb7f743] | 213 | } |
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[96fb8ad] | 214 | } |
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| 215 | |
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[eb7f743] | 216 | smpl_t |
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| 217 | fvec_local_energy (fvec_t * f) |
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| 218 | { |
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| 219 | smpl_t energy = 0.; |
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[8e5c051] | 220 | uint_t j; |
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| 221 | for (j = 0; j < f->length; j++) { |
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| 222 | energy += SQR (f->data[j]); |
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[eb7f743] | 223 | } |
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[1a74ac3] | 224 | return energy / f->length; |
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[96fb8ad] | 225 | } |
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| 226 | |
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[eb7f743] | 227 | smpl_t |
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| 228 | fvec_local_hfc (fvec_t * v) |
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| 229 | { |
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| 230 | smpl_t hfc = 0.; |
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[8e5c051] | 231 | uint_t j; |
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| 232 | for (j = 0; j < v->length; j++) { |
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| 233 | hfc += (j + 1) * v->data[j]; |
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[eb7f743] | 234 | } |
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| 235 | return hfc; |
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[96fb8ad] | 236 | } |
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| 237 | |
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[eb7f743] | 238 | void |
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| 239 | fvec_min_removal (fvec_t * v) |
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| 240 | { |
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| 241 | smpl_t v_min = fvec_min (v); |
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| 242 | fvec_add (v, - v_min ); |
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[96fb8ad] | 243 | } |
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| 244 | |
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[eb7f743] | 245 | smpl_t |
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| 246 | fvec_alpha_norm (fvec_t * o, smpl_t alpha) |
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[c0b295c] | 247 | { |
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[8e5c051] | 248 | uint_t j; |
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[eb7f743] | 249 | smpl_t tmp = 0.; |
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[8e5c051] | 250 | for (j = 0; j < o->length; j++) { |
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| 251 | tmp += POW (ABS (o->data[j]), alpha); |
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[c0b295c] | 252 | } |
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[eb7f743] | 253 | return POW (tmp / o->length, 1. / alpha); |
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[96fb8ad] | 254 | } |
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| 255 | |
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[eb7f743] | 256 | void |
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| 257 | fvec_alpha_normalise (fvec_t * o, smpl_t alpha) |
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| 258 | { |
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[8e5c051] | 259 | uint_t j; |
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[eb7f743] | 260 | smpl_t norm = fvec_alpha_norm (o, alpha); |
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[8e5c051] | 261 | for (j = 0; j < o->length; j++) { |
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| 262 | o->data[j] /= norm; |
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[96fb8ad] | 263 | } |
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| 264 | } |
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| 265 | |
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[eb7f743] | 266 | void |
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| 267 | fvec_add (fvec_t * o, smpl_t val) |
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| 268 | { |
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[8e5c051] | 269 | uint_t j; |
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| 270 | for (j = 0; j < o->length; j++) { |
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| 271 | o->data[j] += val; |
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[96fb8ad] | 272 | } |
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| 273 | } |
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| 274 | |
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[5c4ec3c] | 275 | void fvec_adapt_thres(fvec_t * vec, fvec_t * tmp, |
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[8e5c051] | 276 | uint_t post, uint_t pre) { |
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| 277 | uint_t length = vec->length, j; |
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[96fb8ad] | 278 | for (j=0;j<length;j++) { |
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[8e5c051] | 279 | vec->data[j] -= fvec_moving_thres(vec, tmp, post, pre, j); |
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[96fb8ad] | 280 | } |
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| 281 | } |
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| 282 | |
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[eb7f743] | 283 | smpl_t |
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| 284 | fvec_moving_thres (fvec_t * vec, fvec_t * tmpvec, |
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[8e5c051] | 285 | uint_t post, uint_t pre, uint_t pos) |
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[eb7f743] | 286 | { |
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[8e5c051] | 287 | uint_t k; |
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| 288 | smpl_t *medar = (smpl_t *) tmpvec->data; |
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[eb7f743] | 289 | uint_t win_length = post + pre + 1; |
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| 290 | uint_t length = vec->length; |
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[96fb8ad] | 291 | /* post part of the buffer does not exist */ |
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[eb7f743] | 292 | if (pos < post + 1) { |
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| 293 | for (k = 0; k < post + 1 - pos; k++) |
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| 294 | medar[k] = 0.; /* 0-padding at the beginning */ |
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| 295 | for (k = post + 1 - pos; k < win_length; k++) |
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[8e5c051] | 296 | medar[k] = vec->data[k + pos - post]; |
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[eb7f743] | 297 | /* the buffer is fully defined */ |
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| 298 | } else if (pos + pre < length) { |
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| 299 | for (k = 0; k < win_length; k++) |
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[8e5c051] | 300 | medar[k] = vec->data[k + pos - post]; |
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[eb7f743] | 301 | /* pre part of the buffer does not exist */ |
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[96fb8ad] | 302 | } else { |
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[eb7f743] | 303 | for (k = 0; k < length - pos + post; k++) |
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[8e5c051] | 304 | medar[k] = vec->data[k + pos - post]; |
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[eb7f743] | 305 | for (k = length - pos + post; k < win_length; k++) |
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| 306 | medar[k] = 0.; /* 0-padding at the end */ |
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[ade9afe] | 307 | } |
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[8e5c051] | 308 | return fvec_median (tmpvec); |
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[96fb8ad] | 309 | } |
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| 310 | |
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[8e5c051] | 311 | smpl_t fvec_median (fvec_t * input) { |
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[96fb8ad] | 312 | uint_t n = input->length; |
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[8e5c051] | 313 | smpl_t * arr = (smpl_t *) input->data; |
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[96fb8ad] | 314 | uint_t low, high ; |
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| 315 | uint_t median; |
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| 316 | uint_t middle, ll, hh; |
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| 317 | |
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| 318 | low = 0 ; high = n-1 ; median = (low + high) / 2; |
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| 319 | for (;;) { |
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| 320 | if (high <= low) /* One element only */ |
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| 321 | return arr[median] ; |
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| 322 | |
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| 323 | if (high == low + 1) { /* Two elements only */ |
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| 324 | if (arr[low] > arr[high]) |
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| 325 | ELEM_SWAP(arr[low], arr[high]) ; |
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| 326 | return arr[median] ; |
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| 327 | } |
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| 328 | |
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| 329 | /* Find median of low, middle and high items; swap into position low */ |
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| 330 | middle = (low + high) / 2; |
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| 331 | if (arr[middle] > arr[high]) ELEM_SWAP(arr[middle], arr[high]); |
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| 332 | if (arr[low] > arr[high]) ELEM_SWAP(arr[low], arr[high]); |
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| 333 | if (arr[middle] > arr[low]) ELEM_SWAP(arr[middle], arr[low]) ; |
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| 334 | |
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| 335 | /* Swap low item (now in position middle) into position (low+1) */ |
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| 336 | ELEM_SWAP(arr[middle], arr[low+1]) ; |
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| 337 | |
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| 338 | /* Nibble from each end towards middle, swapping items when stuck */ |
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| 339 | ll = low + 1; |
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| 340 | hh = high; |
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| 341 | for (;;) { |
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| 342 | do ll++; while (arr[low] > arr[ll]) ; |
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| 343 | do hh--; while (arr[hh] > arr[low]) ; |
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| 344 | |
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| 345 | if (hh < ll) |
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| 346 | break; |
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| 347 | |
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| 348 | ELEM_SWAP(arr[ll], arr[hh]) ; |
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| 349 | } |
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| 350 | |
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| 351 | /* Swap middle item (in position low) back into correct position */ |
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| 352 | ELEM_SWAP(arr[low], arr[hh]) ; |
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| 353 | |
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| 354 | /* Re-set active partition */ |
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| 355 | if (hh <= median) |
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| 356 | low = ll; |
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| 357 | if (hh >= median) |
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| 358 | high = hh - 1; |
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| 359 | } |
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| 360 | } |
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| 361 | |
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[8e5c051] | 362 | smpl_t fvec_quadint (fvec_t * x, uint_t pos) { |
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[c5c0c98] | 363 | smpl_t s0, s1, s2; |
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[56ef7e1] | 364 | uint_t x0 = (pos < 1) ? pos : pos - 1; |
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| 365 | uint_t x2 = (pos + 1 < x->length) ? pos + 1 : pos; |
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[8e5c051] | 366 | if (x0 == pos) return (x->data[pos] <= x->data[x2]) ? pos : x2; |
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| 367 | if (x2 == pos) return (x->data[pos] <= x->data[x0]) ? pos : x0; |
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| 368 | s0 = x->data[x0]; |
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| 369 | s1 = x->data[pos]; |
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| 370 | s2 = x->data[x2]; |
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[c5c0c98] | 371 | return pos + 0.5 * (s2 - s0 ) / (s2 - 2.* s1 + s0); |
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[9771488] | 372 | } |
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| 373 | |
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[5c4ec3c] | 374 | uint_t fvec_peakpick(fvec_t * onset, uint_t pos) { |
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[8e5c051] | 375 | uint_t tmp=0; |
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| 376 | tmp = (onset->data[pos] > onset->data[pos-1] |
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| 377 | && onset->data[pos] > onset->data[pos+1] |
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| 378 | && onset->data[pos] > 0.); |
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[ade9afe] | 379 | return tmp; |
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[96fb8ad] | 380 | } |
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| 381 | |
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[eb7f743] | 382 | smpl_t |
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| 383 | aubio_quadfrac (smpl_t s0, smpl_t s1, smpl_t s2, smpl_t pf) |
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| 384 | { |
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| 385 | smpl_t tmp = |
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| 386 | s0 + (pf / 2.) * (pf * (s0 - 2. * s1 + s2) - 3. * s0 + 4. * s1 - s2); |
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| 387 | return tmp; |
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| 388 | } |
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| 389 | |
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| 390 | smpl_t |
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| 391 | aubio_freqtomidi (smpl_t freq) |
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| 392 | { |
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[ade9afe] | 393 | /* log(freq/A-2)/log(2) */ |
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[eb7f743] | 394 | smpl_t midi = freq / 6.875; |
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| 395 | midi = LOG (midi) / 0.69314718055995; |
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[ade9afe] | 396 | midi *= 12; |
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| 397 | midi -= 3; |
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| 398 | return midi; |
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[79c2e52] | 399 | } |
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| 400 | |
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[eb7f743] | 401 | smpl_t |
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| 402 | aubio_miditofreq (smpl_t midi) |
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| 403 | { |
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| 404 | smpl_t freq = (midi + 3.) / 12.; |
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| 405 | freq = EXP (freq * 0.69314718055995); |
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[ade9afe] | 406 | freq *= 6.875; |
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| 407 | return freq; |
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[96fb8ad] | 408 | } |
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| 409 | |
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[eb7f743] | 410 | smpl_t |
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| 411 | aubio_bintofreq (smpl_t bin, smpl_t samplerate, smpl_t fftsize) |
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| 412 | { |
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| 413 | smpl_t freq = samplerate / fftsize; |
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| 414 | return freq * bin; |
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[96fb8ad] | 415 | } |
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| 416 | |
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[eb7f743] | 417 | smpl_t |
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| 418 | aubio_bintomidi (smpl_t bin, smpl_t samplerate, smpl_t fftsize) |
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| 419 | { |
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| 420 | smpl_t midi = aubio_bintofreq (bin, samplerate, fftsize); |
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| 421 | return aubio_freqtomidi (midi); |
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[96fb8ad] | 422 | } |
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| 423 | |
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[eb7f743] | 424 | smpl_t |
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| 425 | aubio_freqtobin (smpl_t freq, smpl_t samplerate, smpl_t fftsize) |
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| 426 | { |
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| 427 | smpl_t bin = fftsize / samplerate; |
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| 428 | return freq * bin; |
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[79c2e52] | 429 | } |
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| 430 | |
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[eb7f743] | 431 | smpl_t |
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| 432 | aubio_miditobin (smpl_t midi, smpl_t samplerate, smpl_t fftsize) |
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| 433 | { |
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| 434 | smpl_t freq = aubio_miditofreq (midi); |
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| 435 | return aubio_freqtobin (freq, samplerate, fftsize); |
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[79c2e52] | 436 | } |
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| 437 | |
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[10a5413] | 438 | uint_t |
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[41f4c5b] | 439 | aubio_is_power_of_two (uint_t a) |
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| 440 | { |
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| 441 | if ((a & (a - 1)) == 0) { |
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[10a5413] | 442 | return 1; |
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| 443 | } else { |
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[41f4c5b] | 444 | return 0; |
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[10a5413] | 445 | } |
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| 446 | } |
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| 447 | |
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| 448 | uint_t |
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[41f4c5b] | 449 | aubio_next_power_of_two (uint_t a) |
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| 450 | { |
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[7581185] | 451 | uint_t i = 1; |
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| 452 | while (i < a) i <<= 1; |
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| 453 | return i; |
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[10a5413] | 454 | } |
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| 455 | |
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[eb7f743] | 456 | smpl_t |
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| 457 | aubio_db_spl (fvec_t * o) |
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| 458 | { |
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[1a74ac3] | 459 | return 10. * LOG10 (fvec_local_energy (o)); |
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[96fb8ad] | 460 | } |
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| 461 | |
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[eb7f743] | 462 | uint_t |
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| 463 | aubio_silence_detection (fvec_t * o, smpl_t threshold) |
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| 464 | { |
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| 465 | return (aubio_db_spl (o) < threshold); |
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| 466 | } |
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[96fb8ad] | 467 | |
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[eb7f743] | 468 | smpl_t |
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| 469 | aubio_level_detection (fvec_t * o, smpl_t threshold) |
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| 470 | { |
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| 471 | smpl_t db_spl = aubio_db_spl (o); |
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| 472 | if (db_spl < threshold) { |
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[ade9afe] | 473 | return 1.; |
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[eb7f743] | 474 | } else { |
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| 475 | return db_spl; |
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| 476 | } |
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[96fb8ad] | 477 | } |
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[a0fd4e4] | 478 | |
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[eb7f743] | 479 | smpl_t |
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| 480 | aubio_zero_crossing_rate (fvec_t * input) |
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| 481 | { |
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[8e5c051] | 482 | uint_t j; |
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[fff2bee] | 483 | uint_t zcr = 0; |
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[eb7f743] | 484 | for (j = 1; j < input->length; j++) { |
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[7e204d01] | 485 | // previous was strictly negative |
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[8e5c051] | 486 | if (input->data[j - 1] < 0.) { |
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[7e204d01] | 487 | // current is positive or null |
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[8e5c051] | 488 | if (input->data[j] >= 0.) { |
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[7e204d01] | 489 | zcr += 1; |
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| 490 | } |
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[eb7f743] | 491 | // previous was positive or null |
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[7e204d01] | 492 | } else { |
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| 493 | // current is strictly negative |
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[8e5c051] | 494 | if (input->data[j] < 0.) { |
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[fff2bee] | 495 | zcr += 1; |
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| 496 | } |
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| 497 | } |
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| 498 | } |
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[eb7f743] | 499 | return zcr / (smpl_t) input->length; |
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[fff2bee] | 500 | } |
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| 501 | |
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[eb7f743] | 502 | void |
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| 503 | aubio_autocorr (fvec_t * input, fvec_t * output) |
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| 504 | { |
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[8e5c051] | 505 | uint_t i, j, length = input->length; |
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[eb7f743] | 506 | smpl_t *data, *acf; |
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| 507 | smpl_t tmp = 0; |
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[8e5c051] | 508 | data = input->data; |
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| 509 | acf = output->data; |
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| 510 | for (i = 0; i < length; i++) { |
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| 511 | tmp = 0.; |
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| 512 | for (j = i; j < length; j++) { |
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| 513 | tmp += data[j - i] * data[j]; |
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[ade9afe] | 514 | } |
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[8e5c051] | 515 | acf[i] = tmp / (smpl_t) (length - i); |
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[ade9afe] | 516 | } |
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[a0fd4e4] | 517 | } |
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| 518 | |
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[eb7f743] | 519 | void |
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| 520 | aubio_cleanup (void) |
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| 521 | { |
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[729a3c0] | 522 | #ifdef HAVE_FFTW3F |
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[eb7f743] | 523 | fftwf_cleanup (); |
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[729a3c0] | 524 | #else |
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| 525 | #ifdef HAVE_FFTW3 |
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| 526 | fftw_cleanup (); |
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[714380d] | 527 | #endif |
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| 528 | #endif |
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| 529 | } |
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