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webaudio.html
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webaudio.html
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<!DOCTYPE html>
<html>
<head>
<title>JS Based Power Electronics</title>
<script>
let processorCount = 0;
const noiseCode0 = `
class Processor extends AudioWorkletProcessor {
static get parameterDescriptors() {
return [{
name: 'gain',
defaultValue: 0.1
}];
}
constructor() {
super();
this.sampleRate = 44100;
}
process(inputs, outputs, parameters) {
const speakers = outputs[0];
for (let i = 0; i < speakers[0].length; i++) {
const noise = Math.random() * 2 - 1;
const gain = parameters.gain[i];
speakers[0][i] = ((noise * gain) + i)/i;
speakers[1][i] = ((noise * gain) - i)/i;
}
return true;
}
}`;
const noiseCode1 = `
class Processor extends AudioWorkletProcessor {
static get parameterDescriptors() {
return [{
name: 'gain',
defaultValue: 0.1
}];
}
constructor() {
super();
this.sampleRate = 44100;
}
process(inputs, outputs, parameters) {
const speakers = outputs[0];
for (let i = 0; i < speakers[0].length; i++) {
const noise = Math.random() * 2 - 1;
const gain = parameters.gain[i];
speakers[0][i] = noise * gain - i;
speakers[1][i] = noise * gain + i;
}
return true;
}
}`;
const noiseCode2 = `
class Processor extends AudioWorkletProcessor {
static get parameterDescriptors() {
return [{
name: 'gain',
defaultValue: 0.1
}];
}
constructor() {
super();
this.sampleRate = 44100;
}
process(inputs, outputs, parameters) {
const speakers = outputs[0];
for (let i = 0; i < speakers[0].length; i++) {
const noise = Math.random() * 2 - 1;
const gain = parameters.gain[i];
speakers[0][i] = (noise * gain * speakers[0].length)/Math.random();
speakers[1][i] = (noise * gain * speakers[1].length)/Math.random();
}
return true;
}
}`;
window.AudioNode = class AudioNode extends AudioWorkletNode {
constructor(audioContext, processorName) {
super(audioContext, processorName, {
numberOfInputs: 0,
numberOfOutputs: 1,
outputChannelCount: [2]
});
this.processorName = processorName;
}
};
function compileNoiseCode(userCode) {
const processorName = `processor-${processorCount++}`;
const code = createProcessorCode(userCode, processorName);
const blob = new Blob([code], { type: "application/javascript" });
const url = window.URL.createObjectURL(blob);
return {url: url, processorName: processorName};
}
function createProcessorCode(userCode, processorName) {
return `${userCode}
registerProcessor("${processorName}", Processor);`;
}
function createAudioWorklet(workletUrl, processorName, audio) {
return audio.audioWorklet.addModule(workletUrl).then(() => {
var node = new AudioNode(audio, processorName);
node.connect(audio.destination);
return node;
});
}
function startAudio(node, audio) {
if (node !== undefined) {
node.connect(node.context.desination);
}
}
function stopAudio(node) {
if (node !== undefined) {
node.disconnect(node.context.desination);
}
}
function recursiveIntervals(mod, audio){
createAudioWorklet(mod.url, mod.processorName, audio).then(function(node){
window.setTimeout(function(){
stopAudio(node);
window.setTimeout(function(){
recursiveIntervals(mod, audio)},
Math.floor((Math.random() * 10000)/7))},
Math.floor(Math.random() * 10000))
})
}
document.addEventListener("DOMContentLoaded", () => {
if (window.AudioContext === undefined || window.AudioWorklet === undefined) {
document.write('unsupported browser :(')
}
else {
var audio = new AudioContext();
var module0 = compileNoiseCode(noiseCode0);
var module1 = compileNoiseCode(noiseCode1);
var module2 = compileNoiseCode(noiseCode2);
recursiveIntervals(module0, audio);
recursiveIntervals(module1, audio);
recursiveIntervals(module2, audio);
}
});
</script>
</head>
<body>
<h1>JS Based Power Electronics</h1>
</body>
</html>