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demo.html
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<!DOCTYPE html>
<html>
<head>
<title>PolySynth</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="../style.css" />
<link rel="stylesheet" href="style.css" />
<script defer type="module" src="../menu.js"></script>
</head>
<body>
<header><h1>PolySynth</h1></header>
<main>
<div id="output">
<p id="master"><input id="master_gain" type="range" min="0" max="1000" value="500"></p>
<input type="button" id="play" value="🎶">
</div>
<fieldset id="waveform"><legend>Define Waveform</legend>
<input id="h0" type="range" min="0" max="1000" value="500">
<input id="h1" type="range" min="0" max="1000" value="0">
<input id="h2" type="range" min="0" max="1000" value="0">
<input id="h3" type="range" min="0" max="1000" value="0">
<input id="h4" type="range" min="0" max="1000" value="0">
<input id="h5" type="range" min="0" max="1000" value="0">
<input id="h6" type="range" min="0" max="1000" value="0">
<input id="h7" type="range" min="0" max="1000" value="0">
<input id="h8" type="range" min="0" max="1000" value="0">
<input id="h9" type="range" min="0" max="1000" value="0">
</fieldset>
<div id="loop" style="display:none;">1</div>
<textarea>
(async () => {
Music.setHeight(3);
document.querySelector("#loop").innerHTML = "1";
while (document.querySelector("#loop").innerHTML == "1") {
(async () => {
let durations = [300,300,300,300,300,300];
let sequence = [2,2,5,5,1,1];
for (let i in sequence) {
let chord = {
tonic:"D",
degree:sequence[i],
mode:"D",
position:i
};
chord = Music.makeChord(chord);
let voices = chord.map(e => synth.noteOn(e));
await wait(durations[i]);
voices.map(e => synth.noteOff(e));
await wait(durations[i]);
}
})();
(async () => {
let sequence = [2,5,1];
for (let i in sequence) {
let chord = {
tonic:"D",
degree:sequence[i],
mode:"D",
position:i
};
chord = Music.makeChord(chord);
chord = chord.slice(0,3);
for (let j in chord) {
j = synth.noteOn(chord[j]+24);
await wait(200);
synth.noteOff(j);
await wait(200);
}
}
})();
if (document.querySelector("#loop").innerHTML != "1") {
break;
}
await wait(3600);
}
})();
</textarea>
<script type="module">
import { Music } from "./Music.js";
import { polyphonicSynth } from "./PolySynth.js";
let visualize = (canvas,context,node) => {
let WIDTH = canvas.width;
let HEIGHT = canvas.height;
node.fftSize = 2048;
let bufferLength = node.fftSize;
let dataArray = new Uint8Array(bufferLength);
context.clearRect(0, 0, WIDTH, HEIGHT);
let draw = () => {
let drawVisual = requestAnimationFrame(draw);
node.getByteTimeDomainData(dataArray);
context.fillStyle = 'rgb(0, 0, 0)';
context.fillRect(0, 0, WIDTH, HEIGHT);
context.lineWidth = 4;
context.strokeStyle = 'rgb(0, 255, 0)';
context.beginPath();
let sliceWidth = WIDTH * 1.0 / bufferLength;
let x = 0;
for(let i = 0; i < bufferLength; i++) {
let v = dataArray[i] / 128.0;
let y = v * HEIGHT/2;
if(i === 0) {
context.moveTo(x, y);
} else {
context.lineTo(x, y);
}
x += sliceWidth;
}
context.lineTo(canvas.width, canvas.height/2);
context.stroke();
};
draw();
};
let getWaveform = () => {
let harmonics = [];
for (let i=0;i<10;i++) {
harmonics.push(parseInt(document.querySelector("#h"+i).value)/1000);
}
return harmonics;
}
(() => {
let audioCtx = new (window.AudioContext || window.webkitAudioContext)();
let master = audioCtx.createGain();
let compressor = audioCtx.createDynamicsCompressor();
let analyserNode = audioCtx.createAnalyser();
let canvas = document.createElement("canvas");
let context = canvas.getContext("2d");
canvas.height = 300;
canvas.width = 1000;
document.querySelector("#output").append(canvas);
let adsr = {
attackTime:0.06,
attackLevel:1,
decayTime:0.1,
decayLevel:0.3,
releaseTime:0.1,
linear:true
};
let synth = new polyphonicSynth(audioCtx,[1,1],compressor,adsr);
synth.setWave([1,...getWaveform()]);
compressor.connect(master);
master.connect(analyserNode);
analyserNode.connect(audioCtx.destination);
master.gain.value = document.querySelector("#master_gain").value/1000;
document.querySelector("#master_gain").addEventListener("input",e => {
master.gain.value = e.target.value/1000;
});
visualize(canvas,context,analyserNode);
let wait = (t) => {
return new Promise((resolve,reject) => {
setTimeout(() => { resolve(); },t)
})
};
let user_input;
document.querySelector("#play").addEventListener("click",async () => {
let user_input_string = document.querySelector("textarea").value;
document.querySelector("#loop").innerHTML = "0";
await wait(5000);
user_input = new Function("Music","synth","wait",user_input_string)
user_input(Music,synth,wait);
});
document.querySelector("#waveform").addEventListener("click", (e) => {
synth.setWave([1,...getWaveform()]);
});
})()
</script>
</main>
<footer>
</footer>
</body>
</html>