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Add audio visualizer demo #29

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1 change: 1 addition & 0 deletions Audio Visualizer/README.md
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- [Reference Video](https://youtu.be/FK0867WUbvE?si=RXDbLERWH7Pe2Kwh)
22 changes: 22 additions & 0 deletions Audio Visualizer/demo.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Audio Visualizer</title>
<style>
canvas {
width: 100%;
height: 95%;
display: block;
position: absolute;
bottom: 0;
}
</style>
</head>
<body>
<input type="file" accept="audio/*" id="audio" />
<canvas id="canvas"></canvas>
<script src="script.js"></script>
</body>
</html>
61 changes: 61 additions & 0 deletions Audio Visualizer/script.js
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document.getElementById("audio").addEventListener("change", (event) => {
const file = event.target.files[0];

const reader = new FileReader();

reader.addEventListener("load", (event) => {
const arrayBuffer = event.target.result;

const audioContext = new (window.AudioContext ||
window.webkitAudioContext)();

audioContext.decodeAudioData(arrayBuffer, (audioBuffer) => {
visualize(audioBuffer, audioContext);
});
});

reader.readAsArrayBuffer(file);
})

function visualize(audioBuffer, audioContext) {
const canvas = document.getElementById("canvas");
canvas.width = canvas.clientWidth;
canvas.height = canvas.clientHeight;

const analyser = audioContext.createAnalyser();
analyser.fftSize = 256;

const frequencyBufferLength = analyser.frequencyBinCount;
const frequencyData = new Uint8Array(frequencyBufferLength);

const source = audioContext.createBufferSource();
source.buffer = audioBuffer;
source.connect(analyser);
analyser.connect(audioContext.destination);
source.start();

const canvasContext = canvas.getContext("2d");

const barWidth = canvas.width / frequencyBufferLength;

function draw() {
requestAnimationFrame(draw);
canvasContext.fillStyle = "rgb(173, 216, 230)";
canvasContext.fillRect(0, 0, canvas.width, canvas.height);

analyser.getByteFrequencyData(frequencyData);

for (let i = 0; i < frequencyBufferLength; i++) {
// The frequency data is composed of integers on a scale from 0 to 255
canvasContext.fillStyle = "rgb(" + (frequencyData[i]) + ",118, 138)";
canvasContext.fillRect(
i * barWidth,
canvas.height - frequencyData[i],
barWidth - 1,
frequencyData[i]
);
}
}

draw();
}
1 change: 1 addition & 0 deletions index.html
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Expand Up @@ -56,6 +56,7 @@
<a href="./BEM(Block, Element Modifier)/demo.html">BEM(Block, Element Modifier)</a>
<a href="./3D animation/demo.html">3D Animation</a>
<a href="./Scroll Watcher/demo.html">Scroll Watcher</a>
<a href="./Audio Visualizer/demo.html">Audio Visualizer</a>
</body>

</html>