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music.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">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>HTML5音频可视化频谱跳动代码</title>
<style>
* {
margin: 0;
padding: 0;
}
#canvas {
position: absolute;
left: 0px;
width:100%;
margin: auto;
/*background: linear-gradient(135deg, rgb(206, 68, 201) 0%, rgb(255, 255, 255) 100%);*/
z-index:-1;
}
#myaudio{
position: absolute;
left: 0px;
width:100%;
margin: auto;
height: auto;
z-index:-1;
}
</style>
</head>
<body>
<input type="file" onchange="selectFile(this)" id="file"/>
<video id="myaudio" crossOrigin="anonymous">
<source id="src" src="">
</video>
<canvas id="canvas"></canvas>
<script>
// 音频图的条数
var count = 200;
var base = 5;
var type = 'rect'; //line, rect, circle
var oAudio = document.getElementById('myaudio');
var canvas = document.getElementById("canvas");
var oCtx, analyser, audioSrc, ctx, oW, oH, color1, voiceHeight;
var step, di;
var flag = true;
function resize() {
oAudio.width = window.innerWidth;
canvas.width = oAudio.width;
canvas.height = oAudio.width*9/16;
oW = canvas.width;
oH = canvas.height;
color1 = '#9e0099';
ctx.strokeStyle='white';
ctx.fillStyle = color1; // 绘制向上的线条
ctx.globalAlpha = 0.5;
di = ~~(voiceHeight.length/count);
step = ~~(oW/count);
if (step < 2) step=2;
window.scrollTo(0, 1080);
}
var drawMethod = {
'line': function() {
// 将当前的频率数据复制到传入的无符号字节数组中，做到实时连接
analyser.getByteFrequencyData(voiceHeight);
//console.log(voiceHeight.length);
// 自定义获取数组里边数据的频步
ctx.clearRect(0, 0, oW, oH);
ctx.beginPath();
ctx.moveTo(0,oH);
var max = 0;
var i = 0, j = 0;
for (; i < voiceHeight.length&&j * step<oW; i+=di) {
ctx.lineTo(j * step, oH -voiceHeight[i]-base);
max = max + voiceHeight[i]+base;
j ++;
}
max = max/j;
ctx.lineTo(oW, oH);
ctx.closePath();
ctx.fill();
ctx.stroke();
ctx.beginPath();
ctx.moveTo(0, oH - max);
ctx.lineTo(oW, oH - max);
ctx.closePath();
ctx.stroke();
},
'rect': function() {
// 将当前的频率数据复制到传入的无符号字节数组中，做到实时连接
analyser.getByteFrequencyData(voiceHeight);
//console.log(voiceHeight.length);
ctx.clearRect(0, 0, oW, oH);
var i = 0, j = 0;
for (; i < voiceHeight.length&&j * step<oW; i+=di) {
ctx.fillRect(j * step, oH/2, step-1, -voiceHeight[i]-base);
ctx.fillRect(j * step, oH/2, step-1, voiceHeight[i]+base);
j++;
}
},
'circle': function() {
// 将当前的频率数据复制到传入的无符号字节数组中，做到实时连接
analyser.getByteFrequencyData(voiceHeight);
//console.log(voiceHeight.length);
ctx.clearRect(0, 0, oW, oH);
var i = 0;
for (; i < voiceHeight.length&&i * step<oW; i++) {
ctx.fillRect(i * step, oH/2, 1, -voiceHeight[i]-base);
}
}
};
function init() {
if (flag) {
// 创建音频上下文对象
oCtx = new AudioContext();
// 创建媒体源,除了audio本身可以获取，也可以通过oCtx对象提供的api进行媒体源操作
audioSrc = oCtx.createMediaElementSource(oAudio);
flag = false;
// 创建分析机
analyser = oCtx.createAnalyser();
// 媒体源与分析机连接
audioSrc.connect(analyser);
// 输出的目标：将分析机分析出来的处理结果与目标点（耳机/扬声器）连接
analyser.connect(oCtx.destination);
/*
根据分析音频的数据去获取音频频次界定音频图的高度
放在与音频频次等长的8位无符号字节数组
Uint8Array:初始化默认值为1024
*/
// 缓冲区:进行数据的缓冲处理，转换成二进制数据
voiceHeight = new Uint8Array(analyser.frequencyBinCount);
// 效果（实现的具体方法）
// 利用cancas渐变进行音频绘制
ctx = canvas.getContext('2d');
resize();
}
(function draw(){
drawMethod[type]();
window.requestAnimationFrame(draw);
})();
oAudio.play();
window.onresize = resize;
window.scrollTo(0, 1080);
/*
analyserNode 提供了时时频率以及时间域的分析信息
允许你获取实时的数据，并进行音频可视化
analyserNode接口的fftSize属性
fftSize:无符号长整型值，用于确定频域的FFT(快速傅里叶变换)
ffiSize属性值是从32位到32768范围内的2的非零幂,默认值是2048
*/
}
function selectFile(t) {
var file = t.files[0];
var url = URL.createObjectURL(file);
if (file) {
oAudio.src = url;
init();
}
}
canvas.onclick = function () {
if (oAudio.paused) {
oAudio.play();
} else {
oAudio.pause();
}
}
</script>
</body>
</html>