77 lines
2.6 KiB
JavaScript
77 lines
2.6 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.generateTheAudioFingerPrint = void 0;
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// ref = https://github.com/rickmacgillis/audio-fingerprint/blob/master/audio-fingerprinting.js
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// @ts-nocheck
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exports.generateTheAudioFingerPrint = (function () {
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var context = null;
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var currentTime = null;
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var oscillator = null;
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var compressor = null;
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var fingerprint = null;
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var callback = null;
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function run(cb, debug = false) {
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callback = cb;
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try {
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setup();
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oscillator.connect(compressor);
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compressor.connect(context.destination);
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oscillator.start(0);
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context.startRendering();
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context.oncomplete = onComplete;
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}
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catch (e) {
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if (debug) {
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throw e;
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}
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}
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}
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function setup() {
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setContext();
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currentTime = context.currentTime;
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setOscillator();
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setCompressor();
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}
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function setContext() {
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var audioContext = window.OfflineAudioContext || window.webkitOfflineAudioContext;
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context = new audioContext(1, 44100, 44100);
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}
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function setOscillator() {
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oscillator = context.createOscillator();
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oscillator.type = "triangle";
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oscillator.frequency.setValueAtTime(10000, currentTime);
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}
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function setCompressor() {
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compressor = context.createDynamicsCompressor();
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setCompressorValueIfDefined('threshold', -50);
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setCompressorValueIfDefined('knee', 40);
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setCompressorValueIfDefined('ratio', 12);
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setCompressorValueIfDefined('reduction', -20);
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setCompressorValueIfDefined('attack', 0);
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setCompressorValueIfDefined('release', .25);
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}
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function setCompressorValueIfDefined(item, value) {
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if (compressor[item] !== undefined && typeof compressor[item].setValueAtTime === 'function') {
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compressor[item].setValueAtTime(value, context.currentTime);
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}
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}
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function onComplete(event) {
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generateFingerprints(event);
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compressor.disconnect();
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}
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function generateFingerprints(event) {
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var output = null;
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for (var i = 4500; 5e3 > i; i++) {
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var channelData = event.renderedBuffer.getChannelData(0)[i];
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output += Math.abs(channelData);
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}
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fingerprint = output.toString();
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if (typeof callback === 'function') {
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return callback(fingerprint);
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}
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}
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return {
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run: run
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};
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})();
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