1 |
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2 | var WFChromaTransform = function(transformMode,frameBufferLength,channels,samplerate,totalNumFrames) {
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3 |
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4 | this.getset = {};
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5 |
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6 | this.transformMode = transformMode;
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7 |
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8 | this.frameBufferLength = frameBufferLength;
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9 | this.channels = channels;
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10 | this.samplerate = samplerate;
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11 |
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12 | this.totalNumFrames = totalNumFrames; // **** Not currently used
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13 |
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14 | this.defaults();
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15 |
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16 | var fftWindowSize = Math.floor(this.frameBufferLength/channels); // check this is a power of 2??
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17 |
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18 | this.initCQT(fftWindowSize, fftWindowSize/2);
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19 |
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20 | this.fft = new FFTCustom(fftWindowSize, this.samplerate);
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21 |
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22 | this.chromaFeaturesOut = new Float32Array(this.numChromaBins); // Init once here, space is reused per calculation
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23 | this.filterBankOut = new Float32Array(this.cqt_rec.cqtN); // ditto above
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24 |
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25 | this.chromaFeaturesSequence = new Array();
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26 | this.filterBankSequence = new Array();
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27 |
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28 | this.maxval = { freqSpectrum: 0.0, freqPowerSpectrum: 0.0, filterBank: 0.0, chromaFeatures: 0.0 };
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29 |
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30 | }
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31 |
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32 | WFChromaTransform.inherits(Component);
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33 |
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34 | //----------------------------- OVERVIEW -----------------------------------------------------
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35 |
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36 | WFChromaTransform.staticfield('Component', {
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37 |
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38 | creator: "David Bainbridge",
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39 | description: "Overview: To be written ...",
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40 | name: "Chromagram",
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41 | tags: "signal process, chromagram",
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42 | dependency: [ "dsp.js" ]
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43 | });
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44 |
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45 | //------------------------------ INPUTS ------------------------------------------------------
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46 |
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47 | WFChromaTransform.staticfield('ComponentInputArray', [
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48 | /*
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49 | {
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50 | name: "signal",
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51 | description: "A Signal object with \"fileLocation\" metadata, indicating the "
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52 | + "location of the corresponding audio file."
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53 | }
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54 | */
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55 | {
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56 | name: "inputFrames",
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57 | description: "Frames of mono-audio input"
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58 | }
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59 |
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60 | ]);
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61 |
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62 |
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63 | //------------------------------ PROPERTIES --------------------------------------------------
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64 |
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65 | WFChromaTransform.staticfield('ComponentPropertyArray', [
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66 |
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67 | ]);
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68 |
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69 |
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70 | //------------------------------ OUTPUTS -----------------------------------------------------
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71 |
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72 | WFChromaTransform.staticfield('ComponentOutputArray', [
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73 |
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74 | {
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75 | name: "output",
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76 | description: "Chroma bins"
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77 | }
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78 | ]);
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79 |
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80 |
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81 |
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82 |
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83 | WFChromaTransform.prototype.reset = function()
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84 | {
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85 | this.maxval.freqSpectrum = 0.0;
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86 | this.maxval.freqPowerSpectrum = 0.0;
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87 | this.maxval.filterBank = 0.0;
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88 | this.maxval.chromaFeatures = 0.0;
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89 | }
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90 |
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91 | WFChromaTransform.prototype.setTransformMode = function(transformMode) {
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92 | this.transformMode = transformMode;
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93 | }
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94 |
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95 | WFChromaTransform.prototype.getTransformMode = function() {
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96 | return this.transformMode;
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97 | }
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98 |
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99 | WFChromaTransform.prototype.setMaxVal = function(v)
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100 | {
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101 | this.maxval[this.transformMode] = v;
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102 | }
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103 |
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104 |
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105 | WFChromaTransform.prototype.getMaxVal = function()
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106 | {
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107 | var maxVal = this.maxval[this.transformMode];
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108 |
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109 | return maxVal;
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110 | }
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111 |
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112 | WFChromaTransform.prototype.getChromaFeaturesSequence = function() {
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113 | return this.chromaFeaturesSequence;
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114 | }
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115 |
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116 | WFChromaTransform.prototype.getFilterBankSequence = function() {
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117 | return this.filterBankSequence;
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118 | }
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119 |
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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 |
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125 |
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126 | WFChromaTransform.prototype.defaults = function() {
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127 |
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128 | this.constantQ = 12;
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129 | this.numOctaves = 1;
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130 | this.numChromaBins = this.constantQ * this.numOctaves;
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131 |
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132 | this.loEdge = 55.0 * Math.pow(2.0, 2.5/12.0); // low C minus quater tone
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133 | this.hiEdge = 8000.0;
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134 |
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135 | };
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136 |
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137 |
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138 | WFChromaTransform.prototype.initializeCallback = function(ccp) {
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139 |
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140 |
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141 | this.progress = 0;
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142 | this.ssm = null;
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143 | }
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144 |
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145 |
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146 | //
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147 | // init Constant Q transform (http://en.wikipedia.org/wiki/Constant_Q_transform)
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148 | //
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149 | WFChromaTransform.prototype.initCQT = function(fftN, outN) {
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150 |
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151 | // Linear to log frequency map for FFT
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152 |
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153 | // BPO = bands per octave
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154 |
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155 | var info_mess = "chroma-transform: { ";
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156 | info_mess += "constantQ: " + this.constantQ;
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157 | info_mess += ", fftN = " + fftN;
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158 | info_mess += ", outN = " + outN;
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159 | info_mess += ", sameplerate = " + this.samplerate;
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160 | info_mess += ", loEdge = " + this.loEdge + " Hz";
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161 | info_mess += ", hiEdge = " + this.hiEdge + " Hz";
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162 | info_mess += " }";
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163 |
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164 | console.info(info_mess);
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165 |
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166 | var i,j;
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167 |
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168 | var BPO = this.constantQ;
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169 | var fratio = Math.pow(2.0,1.0/BPO);// Constant-Q bandwidth
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170 |
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171 | var cqtN = Math.floor(Math.log(this.hiEdge/this.loEdge)/Math.log(fratio));
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172 | if(cqtN<1) {
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173 | console.error("cqtN not positive definite");
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174 | }
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175 |
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176 | if (_dspdebug) {
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177 | console.log("debug: cqtN = " + cqtN);
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178 | }
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179 |
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180 | var fftfrqs = new Float32Array(outN); // Actual number of real FFT coefficients
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181 | var logfrqs = new Float32Array(cqtN); // Number of constant-Q spectral bins
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182 | var logfbws = new Float32Array(cqtN); // Bandwidths of constant-Q bins
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183 |
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184 | var CQT = new Float32Array(cqtN*outN); // The transformation matrix
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185 |
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186 | var mxnorm = new Float32Array(cqtN); // Normalization coefficients
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187 | var N = fftN; // N used as a (double)
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188 |
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189 | for(i=0; i < outN; i++) {
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190 | fftfrqs[i] = i * this.samplerate / N;
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191 | }
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192 |
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193 | for(i=0; i<cqtN; i++){
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194 | logfrqs[i] = this.loEdge * Math.exp(Math.log(2.0)*i/BPO);
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195 | logfbws[i] = Math.max(logfrqs[i] * (fratio - 1.0), this.samplerate / N);
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196 | }
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197 |
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198 | var ovfctr = 0.5475; // Norm constant so CQT'*CQT close to 1.0
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199 | var tmp,tmp2;
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200 | var ptr;
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201 |
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202 | // Build the constant-Q transform (CQT)
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203 | for(i=0,ptr=0; i<cqtN; i++){
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204 | mxnorm[i]=0.0;
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205 | tmp2=1.0/(ovfctr*logfbws[i]);
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206 | for(j=0 ; j < outN; j++, ptr++){
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207 | tmp=(logfrqs[i] - fftfrqs[j])*tmp2;
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208 | tmp=Math.exp(-0.5*tmp*tmp);
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209 | CQT[ptr]=tmp; // row major transform
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210 | mxnorm[i]+=tmp*tmp;
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211 | }
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212 | mxnorm[i]=2.0*Math.sqrt(mxnorm[i]);
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213 | }
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214 |
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215 | // Normalize transform matrix for identity inverse
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216 | for(i=0,ptr=0; i<cqtN; i++) {
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217 | tmp = 1.0/mxnorm[i];
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218 | for(j=0; j<outN; j++,ptr++) {
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219 | CQT[ptr] *= tmp;
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220 | }
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221 | }
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222 |
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223 | var cqt_rec = { CQT: CQT, cqtN: cqtN, outN: outN };
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224 |
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225 | if (_dspdebug) {
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226 | var CQT = cqt_rec.CQT;
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227 | var cqtN = cqt_rec.cqtN;
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228 | var outN = cqt_rec.outN;
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229 |
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230 | //for(i=0,ptr=0; i<cqtN; i++){
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231 | for(i=0,ptr=0; i<cqtN; i+=10){
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232 | ptr = i*outN;
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233 | var line = "";
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234 | //for(j=0; j<outN; j++,ptr++) {
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235 | for(j=0; j<outN; j+=20,ptr+=20) {
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236 | line += CQT[ptr] + " ";
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237 | }
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238 | console.log(line);
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239 | }
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240 | }
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241 |
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242 | // store it in object
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243 | this.cqt_rec = cqt_rec;
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244 |
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245 | };
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246 |
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247 |
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248 | WFChromaTransform.prototype.computeFilterBank = function(fftSpectrumIn,cqtOut)
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249 | {
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250 | var CQT = this.cqt_rec.CQT;
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251 | var cqtN = this.cqt_rec.cqtN;
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252 | var outN = this.cqt_rec.outN;
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253 |
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254 | // matrix product of CQT * fftSpectrumIn
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255 |
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256 | var a=cqtN;
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257 | var i=0;
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258 |
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259 | while (a--) {
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260 | cqtOut[i] = 0.0;
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261 |
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262 | var ptr2 = i * outN;
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263 | var ptr3 = 0;
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264 |
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265 | var b = outN;
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266 | while (b--) {
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267 |
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268 | cqtOut[i] += CQT[ptr2] * fftSpectrumIn[ptr3];
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269 |
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270 | ptr2++;
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271 | ptr3++;
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272 | }
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273 |
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274 | if (cqtOut[i]>this.maxval.filterBank) {
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275 | this.maxval.filterBank = cqtOut[i];
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276 | }
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277 |
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278 | i++;
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279 | }
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280 | }
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281 |
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282 | WFChromaTransform.prototype.computeChroma = function(cqtIn, chromaOut) {
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283 |
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284 | // compute CHROMA
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285 |
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286 | var cqtN = cqtIn.length;
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287 |
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288 | var log10 = Math.log(10);
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289 |
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290 | var a = this.numChromaBins;
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291 |
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292 | var i=0;
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293 |
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294 | while(a--){
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295 | var c = 1;
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296 |
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297 | // folder higher up octaves into the first one
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298 | var ptr1_val = 0;
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299 |
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300 | //for(var b=this.constantQ+i; b<cqtN; b+=this.constantQ){
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301 | for(var b=i; b<cqtN; b+=this.numChromaBins){
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302 | ptr1_val += cqtIn[b];
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303 | c++;
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304 | }
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305 | ptr1_val /= c; // Normalize by number of bands summed
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306 |
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307 | // ***** can generate negative values ???
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308 | //ptr1_val = Math.log( ptr1_val ) / log10;
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309 |
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310 | chromaOut[i] = ptr1_val;
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311 |
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312 | if (chromaOut[i]>this.maxval.chromaFeatures) {
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313 | this.maxval.chromaFeatures = chromaOut[i];
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314 | }
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315 |
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316 | i++;
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317 | }
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318 | }
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319 |
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320 | WFChromaTransform.prototype.computeChromaAlt = function(spectrumIn,chromaOut) {
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321 |
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322 |
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323 | var CB = chromaOut.length; // num chroma bins
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324 |
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325 | for (var i=0; i<CB; i++) {
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326 | chromaOut[i] = 0.0;
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327 | }
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328 |
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329 | var CR = 440/32.0;
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330 | var fs = this.samplerate;
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331 | var fL = (this.frameBufferLength/this.channels); // **** mod by me
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332 |
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333 | var log2 = Math.log(2);
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334 |
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335 | for (var k=this.loEdge; k<=this.hiEdge; k++) {
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336 | var ind = Math.round(CB*Math.log((k)*fs/fL/CR)/log2);
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337 | var mod_ind = ind%CB;
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338 | chromaOut[mod_ind] += spectrumIn[k];
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339 |
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340 | if (chromaOut[mod_ind]>this.maxval.chromaFeatures) {
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341 | this.maxval.chromaFeatures = chromaOut[mod_ind];
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342 | }
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343 |
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344 | }
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345 |
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346 | }
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347 |
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348 |
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349 | WFChromaTransform.prototype.computeTransform = function(filterBankFrame) {
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350 |
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351 |
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352 | //this.fft.forward(monoAudioFrame);
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353 |
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354 | //this.computeFilterBank(this.fft.powerSpectrum,this.filterBankOut);
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355 |
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356 | //var filterBankCopy = new Float32Array(this.filterBankOut); // need a copy of the array (not just a reference)
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357 | //this.filterBankSequence.push(filterBankCopy);
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358 |
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359 | this.computeChroma(this.filterBankOut,this.chromaFeaturesOut);
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360 | //this.computeChromaAlt(this.fft.powerSpectrum,this.chromaFeaturesOut);
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361 |
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362 | this.computeChroma(filterBankFrame,this.chromaFeaturesOut);
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363 |
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364 | var chromaFeaturesCopy = new Float32Array(this.chromaFeaturesOut); // need a copy of the array (not just a reference)
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365 | this.chromaFeaturesSequence.push(chromaFeaturesCopy);
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366 | }
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367 |
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368 |
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369 |
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370 | WFChromaTransform.prototype.executeCallBack = function(cc) {
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371 |
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372 | // typeof(cc) => ComponentContext
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373 |
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374 | // get the "[D" input
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375 |
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376 | //console.info("*** WFChromaTransform::executeCallBack(): away to request 'inputFrames'");
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377 |
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378 | var frame = cc.getDataComponentFromInput("inputFrames");
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379 | /*
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380 | var mess = "";
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381 | for (var i=0; i<frame.length; i+=200) {
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382 | mess += frame[i] + ", ";
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383 | }
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384 | console.log("**** WF Chroma Trans: data samples = " + mess);
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385 | */
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386 |
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387 | this.computeTransform(frame);
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388 | }
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389 |
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390 |
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391 | // *********
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392 | // *********
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393 |
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394 |
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395 | WFChromaTransform.prototype.dotProduct = function(v1,v2) {
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396 | var vlen = v1.length;
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397 |
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398 | var d = 0;
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399 |
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400 | for (var i=0; i<vlen; i++) {
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401 | d = d + (v1[i]*v2[i]);
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402 | }
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403 |
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404 | return d;
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405 | }
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406 |
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407 | WFChromaTransform.prototype.vectorLength = function(v) {
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408 | var vlen = v.length;
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409 |
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410 | var l = 0.0;
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411 |
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412 | for (var i=0; i<vlen; i++) {
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413 | l = l + (v[i]*v[i]);
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414 | }
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415 |
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416 | l = Math.sqrt(l);
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417 |
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418 | return l;
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419 | }
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420 |
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421 |
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422 | WFChromaTransform.prototype.computeSelfSimilarityMatrix = function(chromaFeaturesSequence) {
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423 |
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424 | var num_frames = chromaFeaturesSequence.length;
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425 |
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426 | var norm_lengths = new Float32Array(num_frames);
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427 |
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428 | this.csm = new Array(num_frames) ; // chroma (self) similarity matrix
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429 | for (var i=0; i<num_frames; i++) {
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430 | this.csm[i] = new Float32Array(num_frames);
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431 | this.csm[i][i]=1.0;
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432 |
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433 | norm_lengths[i] = this.vectorLength(chromaFeaturesSequence[i]);
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434 | }
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435 |
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436 |
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437 | var total_calcs = num_frames*num_frames;
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438 | var c = 0;
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439 | this.progress = 0;
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440 |
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441 | var i = 0;
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442 |
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443 | (function(outerThis) {
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444 | //for (var i=0; i<num_frames-1; i++) {
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445 |
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446 |
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447 | for (var j=i+1; j<num_frames; j++) {
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448 |
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449 | outerThis.progress = Math.round((100.0*c)/total_calcs);
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450 |
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451 | outerThis.csm[i][j] = outerThis.dotProduct(chromaFeaturesSequence[i],chromaFeaturesSequence[j])/(norm_lengths[i]*norm_lengths[j]);
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452 |
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453 | outerThis.csm[j][i] = outerThis.csm[i][j];
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454 | c+=2;
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455 | }
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456 | i++;
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457 |
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458 | if (i<num_frames-1) {
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459 | setTimeout(arguments.callee,0,outerThis);
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460 | }
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461 | else {
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462 | outerThis.progress = 100;
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463 | }
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464 | })(this);
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465 |
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466 |
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467 | }
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