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4 |
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5 | function AudioAnalyser( audio, fftSize ) {
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6 |
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7 | this.analyser = audio.context.createAnalyser();
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8 | this.analyser.fftSize = fftSize !== undefined ? fftSize : 2048;
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9 |
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10 | this.data = new Uint8Array( this.analyser.frequencyBinCount );
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11 |
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12 | audio.getOutput().connect( this.analyser );
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13 |
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14 | }
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15 |
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16 | Object.assign( AudioAnalyser.prototype, {
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17 |
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18 | getFrequencyData: function () {
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19 |
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20 | this.analyser.getByteFrequencyData( this.data );
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21 |
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22 | return this.data;
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23 |
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24 | },
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25 |
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26 | getAverageFrequency: function () {
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27 |
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28 | var value = 0, data = this.getFrequencyData();
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29 |
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30 | for ( var i = 0; i < data.length; i ++ ) {
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31 |
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32 | value += data[ i ];
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33 |
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34 | }
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35 |
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36 | return value / data.length;
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37 |
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38 | }
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39 |
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40 | } );
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41 |
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42 | export { AudioAnalyser };
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