[96fb8ad] | 1 | /* |
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[e6a78ea] | 2 | Copyright (C) 2003-2009 Paul Brossier <piem@aubio.org> |
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[96fb8ad] | 3 | |
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[e6a78ea] | 4 | This file is part of aubio. |
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[96fb8ad] | 5 | |
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[e6a78ea] | 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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[e6a78ea] | 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 | #include "aubio_priv.h" |
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[6c7d49b] | 22 | #include "fvec.h" |
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[96fb8ad] | 23 | #include "mathutils.h" |
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[b01bd4a] | 24 | #include "lvec.h" |
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| 25 | #include "temporal/filter.h" |
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[32d6958] | 26 | #include "temporal/biquad.h" |
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| 27 | #include "onset/peakpick.h" |
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[96fb8ad] | 28 | |
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[6e57c2e] | 29 | /** function pointer to thresholding function */ |
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| 30 | typedef smpl_t (*aubio_thresholdfn_t)(fvec_t *input, uint_t channel); |
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| 31 | /** function pointer to peak-picking function */ |
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| 32 | typedef uint_t (*aubio_pickerfn_t)(fvec_t *input, uint_t pos); |
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| 33 | |
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| 34 | /** set peak picker thresholding function */ |
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| 35 | uint_t aubio_peakpicker_set_thresholdfn(aubio_peakpicker_t * p, aubio_thresholdfn_t thresholdfn); |
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| 36 | /** get peak picker thresholding function */ |
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| 37 | aubio_thresholdfn_t aubio_peakpicker_get_thresholdfn(aubio_peakpicker_t * p); |
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| 38 | |
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[96fb8ad] | 39 | /* peak picking parameters, default values in brackets |
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| 40 | * |
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[349e455] | 41 | * [<----post----|--pre-->] |
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| 42 | * .................|............. |
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| 43 | * time-> ^now |
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[96fb8ad] | 44 | */ |
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[349e455] | 45 | struct _aubio_peakpicker_t |
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| 46 | { |
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| 47 | /** thresh: offset threshold [0.033 or 0.01] */ |
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| 48 | smpl_t threshold; |
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| 49 | /** win_post: median filter window length (causal part) [8] */ |
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| 50 | uint_t win_post; |
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| 51 | /** pre: median filter window (anti-causal part) [post-1] */ |
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| 52 | uint_t win_pre; |
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| 53 | /** threshfn: name or handle of fn for computing adaptive threshold [median] */ |
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| 54 | aubio_thresholdfn_t thresholdfn; |
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| 55 | /** picker: name or handle of fn for picking event times [peakpick] */ |
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| 56 | aubio_pickerfn_t pickerfn; |
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| 57 | |
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| 58 | /** biquad lowpass filter */ |
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| 59 | aubio_filter_t *biquad; |
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| 60 | /** original onsets */ |
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| 61 | fvec_t *onset_keep; |
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| 62 | /** modified onsets */ |
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| 63 | fvec_t *onset_proc; |
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| 64 | /** peak picked window [3] */ |
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| 65 | fvec_t *onset_peek; |
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[6e57c2e] | 66 | /** thresholded function */ |
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| 67 | fvec_t *thresholded; |
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[349e455] | 68 | /** scratch pad for biquad and median */ |
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| 69 | fvec_t *scratch; |
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[96fb8ad] | 70 | |
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[56ef7e1] | 71 | /** number of channels to analyse */ |
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| 72 | uint_t channels; |
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| 73 | |
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[349e455] | 74 | /** \bug should be used to calculate filter coefficients */ |
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| 75 | /* cutoff: low-pass filter cutoff [0.34, 1] */ |
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| 76 | /* smpl_t cutoff; */ |
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[96fb8ad] | 77 | |
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[349e455] | 78 | /* not used anymore */ |
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| 79 | /* time precision [512/44100 winlength/samplerate, fs/buffer_size */ |
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| 80 | /* smpl_t tau; */ |
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| 81 | /* alpha: normalisation exponent [9] */ |
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| 82 | /* smpl_t alpha; */ |
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[96fb8ad] | 83 | }; |
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| 84 | |
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| 85 | |
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| 86 | /** modified version for real time, moving mean adaptive threshold this method |
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| 87 | * is slightly more permissive than the offline one, and yelds to an increase |
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| 88 | * of false positives. best */ |
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[56ef7e1] | 89 | void |
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| 90 | aubio_peakpicker_do (aubio_peakpicker_t * p, fvec_t * onset, fvec_t * out) |
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| 91 | { |
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| 92 | fvec_t *onset_keep = p->onset_keep; |
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| 93 | fvec_t *onset_proc = p->onset_proc; |
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| 94 | fvec_t *onset_peek = p->onset_peek; |
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[6e57c2e] | 95 | fvec_t *thresholded = p->thresholded; |
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[56ef7e1] | 96 | fvec_t *scratch = p->scratch; |
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| 97 | smpl_t mean = 0., median = 0.; |
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| 98 | uint_t length = p->win_post + p->win_pre + 1; |
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| 99 | uint_t i, j = 0; |
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| 100 | |
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| 101 | for (i = 0; i < p->channels; i++) { |
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| 102 | /* store onset in onset_keep */ |
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| 103 | /* shift all elements but last, then write last */ |
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| 104 | for (j = 0; j < length - 1; j++) { |
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| 105 | onset_keep->data[i][j] = onset_keep->data[i][j + 1]; |
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| 106 | onset_proc->data[i][j] = onset_keep->data[i][j]; |
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| 107 | } |
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| 108 | onset_keep->data[i][length - 1] = onset->data[i][0]; |
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| 109 | onset_proc->data[i][length - 1] = onset->data[i][0]; |
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| 110 | } |
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| 111 | |
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| 112 | /* filter onset_proc */ |
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| 113 | /** \bug filtfilt calculated post+pre times, should be only once !? */ |
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[b01bd4a] | 114 | aubio_filter_do_filtfilt (p->biquad, onset_proc, scratch); |
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[56ef7e1] | 115 | |
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| 116 | for (i = 0; i < p->channels; i++) { |
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| 117 | /* calculate mean and median for onset_proc */ |
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| 118 | mean = fvec_mean_channel (onset_proc, i); |
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| 119 | /* copy to scratch */ |
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| 120 | for (j = 0; j < length; j++) |
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| 121 | scratch->data[i][j] = onset_proc->data[i][j]; |
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| 122 | median = p->thresholdfn (scratch, i); |
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| 123 | |
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| 124 | /* shift peek array */ |
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| 125 | for (j = 0; j < 3 - 1; j++) |
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| 126 | onset_peek->data[i][j] = onset_peek->data[i][j + 1]; |
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[6e57c2e] | 127 | /* calculate new tresholded value */ |
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| 128 | thresholded->data[i][0] = |
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[56ef7e1] | 129 | onset_proc->data[i][p->win_post] - median - mean * p->threshold; |
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[6e57c2e] | 130 | onset_peek->data[i][2] = thresholded->data[i][0]; |
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[56ef7e1] | 131 | out->data[i][0] = (p->pickerfn) (onset_peek, 1); |
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| 132 | if (out->data[i][0]) { |
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| 133 | out->data[i][0] = fvec_quadint (onset_peek, 1, i); |
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| 134 | } |
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[0f6f2e6] | 135 | } |
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[96fb8ad] | 136 | } |
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| 137 | |
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[f2adb86] | 138 | /** this method returns the current value in the pick peaking buffer |
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| 139 | * after smoothing |
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| 140 | */ |
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[6e57c2e] | 141 | fvec_t * |
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[349e455] | 142 | aubio_peakpicker_get_thresholded_input (aubio_peakpicker_t * p) |
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[f2adb86] | 143 | { |
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[6e57c2e] | 144 | return p->thresholded; |
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[f2adb86] | 145 | } |
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| 146 | |
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[349e455] | 147 | uint_t |
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| 148 | aubio_peakpicker_set_threshold (aubio_peakpicker_t * p, smpl_t threshold) |
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| 149 | { |
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| 150 | p->threshold = threshold; |
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| 151 | return AUBIO_OK; |
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[6efdc83] | 152 | } |
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| 153 | |
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[349e455] | 154 | smpl_t |
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| 155 | aubio_peakpicker_get_threshold (aubio_peakpicker_t * p) |
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| 156 | { |
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| 157 | return p->threshold; |
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[6efdc83] | 158 | } |
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[96fb8ad] | 159 | |
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[349e455] | 160 | uint_t |
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| 161 | aubio_peakpicker_set_thresholdfn (aubio_peakpicker_t * p, |
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| 162 | aubio_thresholdfn_t thresholdfn) |
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| 163 | { |
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| 164 | p->thresholdfn = thresholdfn; |
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| 165 | return AUBIO_OK; |
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[6efdc83] | 166 | } |
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| 167 | |
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[349e455] | 168 | aubio_thresholdfn_t |
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| 169 | aubio_peakpicker_get_thresholdfn (aubio_peakpicker_t * p) |
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| 170 | { |
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| 171 | return (aubio_thresholdfn_t) (p->thresholdfn); |
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[6efdc83] | 172 | } |
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[96fb8ad] | 173 | |
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[349e455] | 174 | aubio_peakpicker_t * |
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| 175 | new_aubio_peakpicker (uint_t channels) |
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| 176 | { |
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| 177 | aubio_peakpicker_t *t = AUBIO_NEW (aubio_peakpicker_t); |
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| 178 | t->threshold = 0.1; /* 0.0668; 0.33; 0.082; 0.033; */ |
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| 179 | t->win_post = 5; |
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| 180 | t->win_pre = 1; |
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[56ef7e1] | 181 | //channels = 1; |
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| 182 | t->channels = channels; |
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[96fb8ad] | 183 | |
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[349e455] | 184 | t->thresholdfn = (aubio_thresholdfn_t) (fvec_median_channel); /* (fvec_mean); */ |
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| 185 | t->pickerfn = (aubio_pickerfn_t) (fvec_peakpick); |
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[96fb8ad] | 186 | |
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[349e455] | 187 | t->scratch = new_fvec (t->win_post + t->win_pre + 1, channels); |
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| 188 | t->onset_keep = new_fvec (t->win_post + t->win_pre + 1, channels); |
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| 189 | t->onset_proc = new_fvec (t->win_post + t->win_pre + 1, channels); |
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| 190 | t->onset_peek = new_fvec (3, channels); |
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[6e57c2e] | 191 | t->thresholded = new_fvec (1, channels); |
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[96fb8ad] | 192 | |
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[349e455] | 193 | /* cutoff: low-pass filter with cutoff reduced frequency at 0.34 |
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| 194 | generated with octave butter function: [b,a] = butter(2, 0.34); |
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[b01bd4a] | 195 | */ |
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| 196 | t->biquad = new_aubio_filter_biquad (0.15998789, 0.31997577, 0.15998789, |
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[349e455] | 197 | -0.59488894, 0.23484048, channels); |
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[b01bd4a] | 198 | |
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[349e455] | 199 | return t; |
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[96fb8ad] | 200 | } |
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| 201 | |
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[349e455] | 202 | void |
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| 203 | del_aubio_peakpicker (aubio_peakpicker_t * p) |
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| 204 | { |
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| 205 | del_aubio_filter (p->biquad); |
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| 206 | del_fvec (p->onset_keep); |
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| 207 | del_fvec (p->onset_proc); |
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| 208 | del_fvec (p->onset_peek); |
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[6e57c2e] | 209 | del_fvec (p->thresholded); |
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[349e455] | 210 | del_fvec (p->scratch); |
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| 211 | AUBIO_FREE (p); |
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[96fb8ad] | 212 | } |
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