1 | /* |
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2 | Copyright (C) 2003-2009 Paul Brossier <piem@aubio.org> |
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3 | |
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4 | This file is part of aubio. |
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5 | |
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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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10 | |
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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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18 | |
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19 | */ |
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20 | |
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21 | #include "aubio_priv.h" |
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22 | #include "fvec.h" |
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23 | #include "mathutils.h" |
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24 | #include "lvec.h" |
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25 | #include "temporal/filter.h" |
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26 | #include "temporal/biquad.h" |
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27 | #include "onset/peakpick.h" |
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28 | |
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29 | /* peak picking parameters, default values in brackets |
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30 | * |
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31 | * [<----post----|--pre-->] |
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32 | * .................|............. |
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33 | * time-> ^now |
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34 | */ |
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35 | struct _aubio_peakpicker_t |
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36 | { |
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37 | /** thresh: offset threshold [0.033 or 0.01] */ |
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38 | smpl_t threshold; |
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39 | /** win_post: median filter window length (causal part) [8] */ |
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40 | uint_t win_post; |
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41 | /** pre: median filter window (anti-causal part) [post-1] */ |
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42 | uint_t win_pre; |
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43 | /** threshfn: name or handle of fn for computing adaptive threshold [median] */ |
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44 | aubio_thresholdfn_t thresholdfn; |
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45 | /** picker: name or handle of fn for picking event times [peakpick] */ |
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46 | aubio_pickerfn_t pickerfn; |
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47 | |
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48 | /** biquad lowpass filter */ |
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49 | aubio_filter_t *biquad; |
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50 | /** original onsets */ |
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51 | fvec_t *onset_keep; |
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52 | /** modified onsets */ |
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53 | fvec_t *onset_proc; |
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54 | /** peak picked window [3] */ |
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55 | fvec_t *onset_peek; |
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56 | /** scratch pad for biquad and median */ |
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57 | fvec_t *scratch; |
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58 | |
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59 | /** number of channels to analyse */ |
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60 | uint_t channels; |
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61 | |
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62 | /** \bug should be used to calculate filter coefficients */ |
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63 | /* cutoff: low-pass filter cutoff [0.34, 1] */ |
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64 | /* smpl_t cutoff; */ |
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65 | |
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66 | /* not used anymore */ |
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67 | /* time precision [512/44100 winlength/samplerate, fs/buffer_size */ |
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68 | /* smpl_t tau; */ |
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69 | /* alpha: normalisation exponent [9] */ |
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70 | /* smpl_t alpha; */ |
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71 | }; |
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72 | |
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73 | |
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74 | /** modified version for real time, moving mean adaptive threshold this method |
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75 | * is slightly more permissive than the offline one, and yelds to an increase |
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76 | * of false positives. best */ |
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77 | void |
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78 | aubio_peakpicker_do (aubio_peakpicker_t * p, fvec_t * onset, fvec_t * out) |
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79 | { |
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80 | fvec_t *onset_keep = p->onset_keep; |
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81 | fvec_t *onset_proc = p->onset_proc; |
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82 | fvec_t *onset_peek = p->onset_peek; |
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83 | fvec_t *scratch = p->scratch; |
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84 | smpl_t mean = 0., median = 0.; |
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85 | uint_t length = p->win_post + p->win_pre + 1; |
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86 | uint_t i, j = 0; |
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87 | |
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88 | for (i = 0; i < p->channels; i++) { |
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89 | /* store onset in onset_keep */ |
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90 | /* shift all elements but last, then write last */ |
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91 | for (j = 0; j < length - 1; j++) { |
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92 | onset_keep->data[i][j] = onset_keep->data[i][j + 1]; |
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93 | onset_proc->data[i][j] = onset_keep->data[i][j]; |
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94 | } |
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95 | onset_keep->data[i][length - 1] = onset->data[i][0]; |
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96 | onset_proc->data[i][length - 1] = onset->data[i][0]; |
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97 | } |
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98 | |
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99 | /* filter onset_proc */ |
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100 | /** \bug filtfilt calculated post+pre times, should be only once !? */ |
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101 | aubio_filter_do_filtfilt (p->biquad, onset_proc, scratch); |
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102 | |
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103 | for (i = 0; i < p->channels; i++) { |
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104 | /* calculate mean and median for onset_proc */ |
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105 | mean = fvec_mean_channel (onset_proc, i); |
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106 | /* copy to scratch */ |
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107 | for (j = 0; j < length; j++) |
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108 | scratch->data[i][j] = onset_proc->data[i][j]; |
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109 | median = p->thresholdfn (scratch, i); |
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110 | |
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111 | /* shift peek array */ |
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112 | for (j = 0; j < 3 - 1; j++) |
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113 | onset_peek->data[i][j] = onset_peek->data[i][j + 1]; |
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114 | /* calculate new peek value */ |
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115 | onset_peek->data[i][2] = |
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116 | onset_proc->data[i][p->win_post] - median - mean * p->threshold; |
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117 | out->data[i][0] = (p->pickerfn) (onset_peek, 1); |
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118 | if (out->data[i][0]) { |
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119 | out->data[i][0] = fvec_quadint (onset_peek, 1, i); |
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120 | } |
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121 | } |
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122 | } |
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123 | |
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124 | /** this method returns the current value in the pick peaking buffer |
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125 | * after smoothing |
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126 | */ |
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127 | smpl_t |
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128 | aubio_peakpicker_get_thresholded_input (aubio_peakpicker_t * p) |
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129 | { |
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130 | return p->onset_peek->data[0][1]; |
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131 | } |
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132 | |
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133 | uint_t |
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134 | aubio_peakpicker_set_threshold (aubio_peakpicker_t * p, smpl_t threshold) |
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135 | { |
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136 | p->threshold = threshold; |
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137 | return AUBIO_OK; |
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138 | } |
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139 | |
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140 | smpl_t |
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141 | aubio_peakpicker_get_threshold (aubio_peakpicker_t * p) |
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142 | { |
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143 | return p->threshold; |
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144 | } |
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145 | |
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146 | uint_t |
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147 | aubio_peakpicker_set_thresholdfn (aubio_peakpicker_t * p, |
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148 | aubio_thresholdfn_t thresholdfn) |
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149 | { |
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150 | p->thresholdfn = thresholdfn; |
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151 | return AUBIO_OK; |
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152 | } |
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153 | |
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154 | aubio_thresholdfn_t |
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155 | aubio_peakpicker_get_thresholdfn (aubio_peakpicker_t * p) |
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156 | { |
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157 | return (aubio_thresholdfn_t) (p->thresholdfn); |
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158 | } |
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159 | |
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160 | aubio_peakpicker_t * |
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161 | new_aubio_peakpicker (uint_t channels) |
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162 | { |
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163 | aubio_peakpicker_t *t = AUBIO_NEW (aubio_peakpicker_t); |
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164 | t->threshold = 0.1; /* 0.0668; 0.33; 0.082; 0.033; */ |
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165 | t->win_post = 5; |
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166 | t->win_pre = 1; |
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167 | //channels = 1; |
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168 | t->channels = channels; |
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169 | |
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170 | t->thresholdfn = (aubio_thresholdfn_t) (fvec_median_channel); /* (fvec_mean); */ |
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171 | t->pickerfn = (aubio_pickerfn_t) (fvec_peakpick); |
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172 | |
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173 | t->scratch = new_fvec (t->win_post + t->win_pre + 1, channels); |
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174 | t->onset_keep = new_fvec (t->win_post + t->win_pre + 1, channels); |
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175 | t->onset_proc = new_fvec (t->win_post + t->win_pre + 1, channels); |
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176 | t->onset_peek = new_fvec (3, channels); |
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177 | |
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178 | /* cutoff: low-pass filter with cutoff reduced frequency at 0.34 |
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179 | generated with octave butter function: [b,a] = butter(2, 0.34); |
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180 | */ |
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181 | t->biquad = new_aubio_filter_biquad (0.15998789, 0.31997577, 0.15998789, |
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182 | -0.59488894, 0.23484048, channels); |
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183 | |
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184 | return t; |
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185 | } |
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186 | |
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187 | void |
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188 | del_aubio_peakpicker (aubio_peakpicker_t * p) |
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189 | { |
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190 | del_aubio_filter (p->biquad); |
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191 | del_fvec (p->onset_keep); |
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192 | del_fvec (p->onset_proc); |
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193 | del_fvec (p->onset_peek); |
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194 | del_fvec (p->scratch); |
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195 | AUBIO_FREE (p); |
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196 | } |
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