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 "fft.h" |
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23 | #include "mathutils.h" |
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24 | #include "hist.h" |
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25 | #include "onsetdetection.h" |
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26 | |
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27 | |
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28 | struct _aubio_onsetdetection_t { |
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29 | aubio_onsetdetection_type type; |
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30 | /** Pointer to aubio_onsetdetection_<type> function */ |
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31 | void (*funcpointer)(aubio_onsetdetection_t *o, |
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32 | cvec_t * fftgrain, fvec_t * onset); |
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33 | smpl_t threshold; |
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34 | fvec_t *oldmag; |
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35 | fft_data_t *meas; |
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36 | fvec_t *dev1 ; |
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37 | fvec_t *theta1; |
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38 | fvec_t *theta2; |
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39 | aubio_hist_t * histog; |
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40 | }; |
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41 | |
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42 | |
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43 | /* Energy based onset detection function */ |
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44 | void aubio_onsetdetection_energy (aubio_onsetdetection_t *o, |
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45 | cvec_t * fftgrain, fvec_t * onset) { |
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46 | uint_t i,j; |
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47 | for (i=0;i<fftgrain->channels;i++) { |
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48 | onset->data[i][0] = 0.; |
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49 | for (j=0;j<fftgrain->length;j++) { |
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50 | onset->data[i][0] += SQR(fftgrain->norm[i][j]); |
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51 | } |
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52 | } |
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53 | } |
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54 | |
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55 | /* High Frequency Content onset detection function */ |
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56 | void aubio_onsetdetection_hfc(aubio_onsetdetection_t *o, cvec_t * fftgrain, fvec_t * onset){ |
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57 | uint_t i,j; |
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58 | for (i=0;i<fftgrain->channels;i++) { |
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59 | onset->data[i][0] = 0.; |
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60 | for (j=0;j<fftgrain->length;j++) { |
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61 | onset->data[i][0] += (j+1)*fftgrain->norm[i][j]; |
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62 | } |
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63 | } |
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64 | } |
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65 | |
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66 | |
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67 | /* Complex Domain Method onset detection function */ |
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68 | void aubio_onsetdetection_complex (aubio_onsetdetection_t *o, cvec_t * fftgrain, fvec_t * onset) { |
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69 | uint_t i, j; |
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70 | uint_t nbins = fftgrain->length; |
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71 | for (i=0;i<fftgrain->channels; i++) { |
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72 | onset->data[i][0] = 0.; |
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73 | for (j=0;j<nbins; j++) { |
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74 | o->dev1->data[i][j] = aubio_unwrap2pi( |
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75 | fftgrain->phas[i][j] |
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76 | -2.0*o->theta1->data[i][j]+ |
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77 | o->theta2->data[i][j]); |
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78 | o->meas[j] = fftgrain->norm[i][j]*CEXPC(I*o->dev1->data[i][j]); |
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79 | /* sum on all bins */ |
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80 | onset->data[i][0] += //(fftgrain->norm[i][j]); |
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81 | SQRT(SQR( REAL(o->oldmag->data[i][j]-o->meas[j]) ) |
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82 | + SQR( IMAG(o->oldmag->data[i][j]-o->meas[j]) ) |
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83 | ); |
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84 | /* swap old phase data (need to remember 2 frames behind)*/ |
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85 | o->theta2->data[i][j] = o->theta1->data[i][j]; |
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86 | o->theta1->data[i][j] = fftgrain->phas[i][j]; |
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87 | /* swap old magnitude data (1 frame is enough) */ |
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88 | o->oldmag->data[i][j] = fftgrain->norm[i][j]; |
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89 | } |
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90 | } |
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91 | } |
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92 | |
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93 | |
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94 | /* Phase Based Method onset detection function */ |
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95 | void aubio_onsetdetection_phase(aubio_onsetdetection_t *o, |
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96 | cvec_t * fftgrain, fvec_t * onset){ |
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97 | uint_t i, j; |
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98 | uint_t nbins = fftgrain->length; |
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99 | for (i=0;i<fftgrain->channels; i++) { |
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100 | onset->data[i][0] = 0.0f; |
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101 | o->dev1->data[i][0]=0.; |
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102 | for ( j=0;j<nbins; j++ ) { |
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103 | o->dev1->data[i][j] = |
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104 | aubio_unwrap2pi( |
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105 | fftgrain->phas[i][j] |
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106 | -2.0*o->theta1->data[i][j] |
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107 | +o->theta2->data[i][j]); |
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108 | if ( o->threshold < fftgrain->norm[i][j] ) |
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109 | o->dev1->data[i][j] = ABS(o->dev1->data[i][j]); |
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110 | else |
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111 | o->dev1->data[i][j] = 0.0f; |
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112 | /* keep a track of the past frames */ |
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113 | o->theta2->data[i][j] = o->theta1->data[i][j]; |
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114 | o->theta1->data[i][j] = fftgrain->phas[i][j]; |
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115 | } |
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116 | /* apply o->histogram */ |
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117 | aubio_hist_dyn_notnull(o->histog,o->dev1); |
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118 | /* weight it */ |
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119 | aubio_hist_weigth(o->histog); |
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120 | /* its mean is the result */ |
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121 | onset->data[i][0] = aubio_hist_mean(o->histog); |
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122 | //onset->data[i][0] = vec_mean(o->dev1); |
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123 | } |
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124 | } |
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125 | |
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126 | /* Spectral difference method onset detection function */ |
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127 | void aubio_onsetdetection_specdiff(aubio_onsetdetection_t *o, |
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128 | cvec_t * fftgrain, fvec_t * onset){ |
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129 | uint_t i, j; |
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130 | uint_t nbins = fftgrain->length; |
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131 | for (i=0;i<fftgrain->channels; i++) { |
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132 | onset->data[i][0] = 0.0f; |
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133 | for (j=0;j<nbins; j++) { |
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134 | o->dev1->data[i][j] = SQRT( |
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135 | ABS(SQR( fftgrain->norm[i][j]) |
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136 | - SQR(o->oldmag->data[i][j]))); |
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137 | if (o->threshold < fftgrain->norm[i][j] ) |
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138 | o->dev1->data[i][j] = ABS(o->dev1->data[i][j]); |
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139 | else |
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140 | o->dev1->data[i][j] = 0.0f; |
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141 | o->oldmag->data[i][j] = fftgrain->norm[i][j]; |
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142 | } |
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143 | |
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144 | /* apply o->histogram (act somewhat as a low pass on the |
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145 | * overall function)*/ |
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146 | aubio_hist_dyn_notnull(o->histog,o->dev1); |
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147 | /* weight it */ |
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148 | aubio_hist_weigth(o->histog); |
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149 | /* its mean is the result */ |
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150 | onset->data[i][0] = aubio_hist_mean(o->histog); |
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151 | |
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152 | } |
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153 | } |
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154 | |
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155 | /* Kullback Liebler onset detection function |
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156 | * note we use ln(1+Xn/(Xn-1+0.0001)) to avoid |
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157 | * negative (1.+) and infinite values (+1.e-10) */ |
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158 | void aubio_onsetdetection_kl(aubio_onsetdetection_t *o, cvec_t * fftgrain, fvec_t * onset){ |
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159 | uint_t i,j; |
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160 | for (i=0;i<fftgrain->channels;i++) { |
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161 | onset->data[i][0] = 0.; |
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162 | for (j=0;j<fftgrain->length;j++) { |
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163 | onset->data[i][0] += fftgrain->norm[i][j] |
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164 | *LOG(1.+fftgrain->norm[i][j]/(o->oldmag->data[i][j]+1.e-10)); |
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165 | o->oldmag->data[i][j] = fftgrain->norm[i][j]; |
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166 | } |
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167 | if (isnan(onset->data[i][0])) onset->data[i][0] = 0.; |
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168 | } |
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169 | } |
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170 | |
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171 | /* Modified Kullback Liebler onset detection function |
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172 | * note we use ln(1+Xn/(Xn-1+0.0001)) to avoid |
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173 | * negative (1.+) and infinite values (+1.e-10) */ |
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174 | void aubio_onsetdetection_mkl(aubio_onsetdetection_t *o, cvec_t * fftgrain, fvec_t * onset){ |
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175 | uint_t i,j; |
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176 | for (i=0;i<fftgrain->channels;i++) { |
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177 | onset->data[i][0] = 0.; |
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178 | for (j=0;j<fftgrain->length;j++) { |
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179 | onset->data[i][0] += LOG(1.+fftgrain->norm[i][j]/(o->oldmag->data[i][j]+1.e-10)); |
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180 | o->oldmag->data[i][j] = fftgrain->norm[i][j]; |
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181 | } |
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182 | if (isnan(onset->data[i][0])) onset->data[i][0] = 0.; |
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183 | } |
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184 | } |
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185 | |
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186 | /* Generic function pointing to the choosen one */ |
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187 | void |
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188 | aubio_onsetdetection(aubio_onsetdetection_t *o, cvec_t * fftgrain, |
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189 | fvec_t * onset) { |
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190 | o->funcpointer(o,fftgrain,onset); |
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191 | } |
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192 | |
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193 | /* Allocate memory for an onset detection |
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194 | * depending on the choosen type, allocate memory as needed |
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195 | */ |
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196 | aubio_onsetdetection_t * |
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197 | new_aubio_onsetdetection (aubio_onsetdetection_type type, |
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198 | uint_t size, uint_t channels){ |
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199 | aubio_onsetdetection_t * o = AUBIO_NEW(aubio_onsetdetection_t); |
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200 | uint_t rsize = size/2+1; |
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201 | switch(type) { |
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202 | /* for both energy and hfc, only fftgrain->norm is required */ |
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203 | case aubio_onset_energy: |
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204 | break; |
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205 | case aubio_onset_hfc: |
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206 | break; |
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207 | /* the other approaches will need some more memory spaces */ |
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208 | case aubio_onset_complex: |
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209 | o->oldmag = new_fvec(rsize,channels); |
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210 | /** bug: must be complex array */ |
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211 | o->meas = AUBIO_ARRAY(fft_data_t,size); |
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212 | o->dev1 = new_fvec(rsize,channels); |
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213 | o->theta1 = new_fvec(rsize,channels); |
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214 | o->theta2 = new_fvec(rsize,channels); |
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215 | break; |
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216 | case aubio_onset_phase: |
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217 | o->dev1 = new_fvec(rsize,channels); |
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218 | o->theta1 = new_fvec(rsize,channels); |
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219 | o->theta2 = new_fvec(rsize,channels); |
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220 | o->histog = new_aubio_hist(0.0f, PI, 10, channels); |
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221 | o->threshold = 0.1; |
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222 | break; |
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223 | case aubio_onset_specdiff: |
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224 | o->oldmag = new_fvec(rsize,channels); |
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225 | o->dev1 = new_fvec(rsize,channels); |
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226 | o->histog = new_aubio_hist(0.0f, PI, 10, channels); |
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227 | o->threshold = 0.1; |
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228 | break; |
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229 | case aubio_onset_kl: |
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230 | o->oldmag = new_fvec(rsize,channels); |
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231 | break; |
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232 | case aubio_onset_mkl: |
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233 | o->oldmag = new_fvec(rsize,channels); |
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234 | break; |
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235 | default: |
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236 | break; |
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237 | } |
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238 | |
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239 | /* this switch could be in its own function to change between |
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240 | * detections on the fly. this would need getting rid of the switch |
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241 | * above and always allocate all the structure */ |
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242 | |
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243 | switch(type) { |
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244 | case aubio_onset_energy: |
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245 | o->funcpointer = aubio_onsetdetection_energy; |
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246 | break; |
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247 | case aubio_onset_hfc: |
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248 | o->funcpointer = aubio_onsetdetection_hfc; |
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249 | break; |
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250 | case aubio_onset_complex: |
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251 | o->funcpointer = aubio_onsetdetection_complex; |
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252 | break; |
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253 | case aubio_onset_phase: |
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254 | o->funcpointer = aubio_onsetdetection_phase; |
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255 | break; |
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256 | case aubio_onset_specdiff: |
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257 | o->funcpointer = aubio_onsetdetection_specdiff; |
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258 | break; |
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259 | case aubio_onset_kl: |
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260 | o->funcpointer = aubio_onsetdetection_kl; |
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261 | break; |
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262 | case aubio_onset_mkl: |
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263 | o->funcpointer = aubio_onsetdetection_mkl; |
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264 | break; |
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265 | default: |
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266 | break; |
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267 | } |
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268 | o->type = type; |
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269 | return o; |
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270 | } |
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271 | |
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272 | void aubio_onsetdetection_free (aubio_onsetdetection_t *o){ |
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273 | del_aubio_onsetdetection(o); |
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274 | } |
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275 | |
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276 | void del_aubio_onsetdetection (aubio_onsetdetection_t *o){ |
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277 | |
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278 | switch(o->type) { |
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279 | /* for both energy and hfc, only fftgrain->norm is required */ |
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280 | case aubio_onset_energy: |
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281 | break; |
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282 | case aubio_onset_hfc: |
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283 | break; |
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284 | /* the other approaches will need some more memory spaces */ |
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285 | case aubio_onset_complex: |
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286 | AUBIO_FREE(o->meas); |
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287 | del_fvec(o->oldmag); |
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288 | del_fvec(o->dev1); |
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289 | del_fvec(o->theta1); |
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290 | del_fvec(o->theta2); |
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291 | break; |
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292 | case aubio_onset_phase: |
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293 | del_fvec(o->dev1); |
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294 | del_fvec(o->theta1); |
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295 | del_fvec(o->theta2); |
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296 | del_aubio_hist(o->histog); |
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297 | break; |
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298 | case aubio_onset_specdiff: |
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299 | del_fvec(o->oldmag); |
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300 | del_fvec(o->dev1); |
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301 | del_aubio_hist(o->histog); |
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302 | break; |
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303 | case aubio_onset_kl: |
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304 | del_fvec(o->oldmag); |
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305 | break; |
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306 | case aubio_onset_mkl: |
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307 | del_fvec(o->oldmag); |
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308 | break; |
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309 | default: |
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310 | break; |
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311 | } |
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312 | AUBIO_FREE(o); |
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313 | |
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314 | } |
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