1 | /* |
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2 | Copyright (C) 2003 Paul Brossier |
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3 | |
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4 | This program is free software; you can redistribute it and/or modify |
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5 | it under the terms of the GNU General Public License as published by |
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6 | the Free Software Foundation; either version 2 of the License, or |
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7 | (at your option) any later version. |
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8 | |
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9 | This program is distributed in the hope that it will be useful, |
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10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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12 | GNU General Public License for more details. |
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13 | |
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14 | You should have received a copy of the GNU General Public License |
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15 | along with this program; if not, write to the Free Software |
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16 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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17 | |
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18 | */ |
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19 | |
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20 | #include "aubio_priv.h" |
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21 | #include "sample.h" |
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22 | #include "mathutils.h" |
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23 | #include "biquad.h" |
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24 | #include "peakpick.h" |
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25 | |
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26 | /* peak picking parameters, default values in brackets |
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27 | * |
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28 | * [<----post----|--pre-->] |
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29 | * .................|............. |
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30 | * time-> ^now |
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31 | */ |
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32 | struct _aubio_pickpeak_t { |
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33 | /** thresh: offset threshold [0.033 or 0.01] */ |
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34 | smpl_t threshold; |
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35 | /** win_post: median filter window length (causal part) [8] */ |
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36 | uint_t win_post; |
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37 | /** pre: median filter window (anti-causal part) [post-1] */ |
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38 | uint_t win_pre; |
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39 | /** threshfn: name or handle of fn for computing adaptive threshold [median] */ |
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40 | aubio_thresholdfn_t thresholdfn; |
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41 | /** picker: name or handle of fn for picking event times [peakpick] */ |
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42 | aubio_pickerfn_t pickerfn; |
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43 | |
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44 | /** biquad lowpass filter */ |
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45 | aubio_biquad_t * biquad; |
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46 | /** original onsets */ |
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47 | fvec_t * onset_keep; |
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48 | /** modified onsets */ |
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49 | fvec_t * onset_proc; |
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50 | /** peak picked window [3] */ |
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51 | fvec_t * onset_peek; |
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52 | /** scratch pad for biquad and median */ |
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53 | fvec_t * scratch; |
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54 | |
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55 | /** \bug should be used to calculate filter coefficients */ |
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56 | /* cutoff: low-pass filter cutoff [0.34, 1] */ |
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57 | /* smpl_t cutoff; */ |
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58 | |
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59 | /* not used anymore */ |
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60 | /* time precision [512/44100 winlength/samplerate, fs/buffer_size */ |
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61 | /* smpl_t tau; */ |
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62 | /* alpha: normalisation exponent [9] */ |
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63 | /* smpl_t alpha; */ |
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64 | }; |
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65 | |
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66 | |
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67 | /** modified version for real time, moving mean adaptive threshold this method |
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68 | * is slightly more permissive than the offline one, and yelds to an increase |
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69 | * of false positives. best */ |
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70 | uint_t aubio_peakpick_pimrt(fvec_t * onset, aubio_pickpeak_t * p) { |
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71 | fvec_t * onset_keep = (fvec_t *)p->onset_keep; |
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72 | fvec_t * onset_proc = (fvec_t *)p->onset_proc; |
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73 | fvec_t * onset_peek = (fvec_t *)p->onset_peek; |
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74 | fvec_t * scratch = (fvec_t *)p->scratch; |
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75 | smpl_t mean = 0., median = 0.; |
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76 | uint_t length = p->win_post + p->win_pre + 1; |
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77 | uint_t i = 0, j; |
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78 | |
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79 | /* store onset in onset_keep */ |
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80 | /* shift all elements but last, then write last */ |
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81 | /* for (i=0;i<channels;i++) { */ |
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82 | for (j=0;j<length-1;j++) { |
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83 | onset_keep->data[i][j] = onset_keep->data[i][j+1]; |
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84 | onset_proc->data[i][j] = onset_keep->data[i][j]; |
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85 | } |
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86 | onset_keep->data[i][length-1] = onset->data[i][0]; |
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87 | onset_proc->data[i][length-1] = onset->data[i][0]; |
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88 | /* } */ |
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89 | |
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90 | /* filter onset_proc */ |
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91 | /** \bug filtfilt calculated post+pre times, should be only once !? */ |
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92 | aubio_biquad_do_filtfilt(p->biquad,onset_proc,scratch); |
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93 | |
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94 | /* calculate mean and median for onset_proc */ |
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95 | /* for (i=0;i<onset_proc->channels;i++) { */ |
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96 | mean = vec_mean(onset_proc); |
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97 | /* copy to scratch */ |
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98 | for (j = 0; j < length; j++) |
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99 | scratch->data[i][j] = onset_proc->data[i][j]; |
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100 | median = p->thresholdfn(scratch); |
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101 | /* } */ |
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102 | |
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103 | /* for (i=0;i<onset->channels;i++) { */ |
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104 | /* shift peek array */ |
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105 | for (j=0;j<3-1;j++) |
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106 | onset_peek->data[i][j] = onset_peek->data[i][j+1]; |
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107 | /* calculate new peek value */ |
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108 | onset_peek->data[i][2] = |
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109 | onset_proc->data[i][p->win_post] - median - mean * p->threshold; |
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110 | /* } */ |
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111 | //AUBIO_DBG("%f\n", onset_peek->data[0][2]); |
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112 | return (p->pickerfn)(onset_peek,1); |
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113 | } |
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114 | |
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115 | /** this method returns the current value in the pick peaking buffer |
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116 | * after smoothing |
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117 | */ |
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118 | smpl_t aubio_peakpick_pimrt_getval(aubio_pickpeak_t * p) |
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119 | { |
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120 | uint_t i = 0; |
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121 | return p->onset_peek->data[i][1]; |
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122 | } |
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123 | |
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124 | /** function added by Miguel Ramirez to return the onset detection amplitude in peakval */ |
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125 | uint_t aubio_peakpick_pimrt_wt(fvec_t * onset, aubio_pickpeak_t * p, smpl_t* peakval) |
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126 | { |
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127 | uint_t isonset = 0; |
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128 | isonset = aubio_peakpick_pimrt(onset,p); |
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129 | |
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130 | //if ( isonset && peakval != NULL ) |
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131 | if ( peakval != NULL ) |
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132 | *peakval = aubio_peakpick_pimrt_getval(p); |
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133 | |
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134 | return isonset; |
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135 | } |
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136 | |
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137 | void aubio_peakpicker_set_threshold(aubio_pickpeak_t * p, smpl_t threshold) { |
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138 | p->threshold = threshold; |
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139 | return; |
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140 | } |
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141 | |
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142 | smpl_t aubio_peakpicker_get_threshold(aubio_pickpeak_t * p) { |
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143 | return p->threshold; |
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144 | } |
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145 | |
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146 | void aubio_peakpicker_set_thresholdfn(aubio_pickpeak_t * p, aubio_thresholdfn_t thresholdfn) { |
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147 | p->thresholdfn = thresholdfn; |
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148 | return; |
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149 | } |
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150 | |
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151 | aubio_thresholdfn_t aubio_peakpicker_get_thresholdfn(aubio_pickpeak_t * p) { |
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152 | return (aubio_thresholdfn_t) (p->thresholdfn); |
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153 | } |
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154 | |
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155 | aubio_pickpeak_t * new_aubio_peakpicker(smpl_t threshold) { |
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156 | aubio_pickpeak_t * t = AUBIO_NEW(aubio_pickpeak_t); |
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157 | t->threshold = 0.1; /* 0.0668; 0.33; 0.082; 0.033; */ |
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158 | if (threshold > 0. && threshold < 10.) |
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159 | t->threshold = threshold; |
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160 | t->win_post = 5; |
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161 | t->win_pre = 1; |
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162 | |
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163 | t->thresholdfn = (aubio_thresholdfn_t)(vec_median); /* (vec_mean); */ |
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164 | t->pickerfn = (aubio_pickerfn_t)(vec_peakpick); |
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165 | |
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166 | t->scratch = new_fvec(t->win_post+t->win_pre+1,1); |
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167 | t->onset_keep = new_fvec(t->win_post+t->win_pre+1,1); |
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168 | t->onset_proc = new_fvec(t->win_post+t->win_pre+1,1); |
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169 | t->onset_peek = new_fvec(3,1); |
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170 | |
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171 | /* cutoff: low-pass filter cutoff [0.34, 1] */ |
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172 | /* t->cutoff=0.34; */ |
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173 | t->biquad = new_aubio_biquad(0.1600,0.3200,0.1600,-0.5949,0.2348); |
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174 | return t; |
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175 | } |
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176 | |
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177 | void del_aubio_peakpicker(aubio_pickpeak_t * p) { |
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178 | del_aubio_biquad(p->biquad); |
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179 | del_fvec(p->onset_keep); |
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180 | del_fvec(p->onset_proc); |
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181 | del_fvec(p->onset_peek); |
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182 | del_fvec(p->scratch); |
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183 | AUBIO_FREE(p); |
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184 | } |
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