/
audio1.html
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audio1.html
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<html lang="en"><head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
#cas{
position: absolute;
left:0;top:0;bottom: 0;right: 0;
margin: auto;
border: 1px solid;
background:#000;
}
</style>
</head>
<body style="background:#000">
<canvas id="cas" width="990" height="540"></canvas>
<button id="start">开始</button>
<button id="stop">暂停</button>
<script type="text/javascript" charset="utf-8">
var canvas = document.getElementById("cas"),ctx=canvas.getContext("2d"),musicBuffer = null;
window.AudioContext= window.AudioContext||window.webkitAudioContext||window.mozAudioContext;
window.RAF = (function(){
return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function (callback) {window.setTimeout(callback, 1000 / 60); };
})();
var AC = new AudioContext();
loadSound('src/files/dubstep/Drum.wav' , function(){
decodeBuffer(musicBuffer)
})
function loadSound(url , callback){
ctx.fillStyle = "#FFF";
ctx.textAlign = "center";
ctx.textBaseline = "middle";
ctx.font = "20px 微软雅黑"
ctx.fillText("音频下载中，请耐心等待..." , canvas.width/2 , canvas.height/2)
var xhr = new XMLHttpRequest();
xhr.open('get' , url);
xhr.responseType = "arraybuffer"
xhr.onload = function(){
musicBuffer = xhr.response
callback()
};
xhr.send();
}
function decodeBuffer(arraybuffer){
AC.decodeAudioData(arraybuffer , function(buffer){
playMusic(buffer)
initAnimation()
}, function(e){
console.log(e)
alert("文件解码失败")
})
}
function changeBuffer(file){
var fr = new FileReader();
fr.onload = function(e){
var fileResult = e.target.result;
AC.decodeAudioData(fileResult , function(buffer){
playMusic(buffer)
}, function(e){
console.log(e)
alert("文件解码失败")
})
}
fr.readAsArrayBuffer(file);
}
var analyser;
var starttime = 0;
var bftime = 0;
var isstart = false;
var absn,myBuffer;
function playMusic(buffer,second){
absn = AC.createBufferSource();
analyser = AC.createAnalyser();
absn.connect(analyser);
absn.connect(AC.destination);
absn.buffer = buffer;
absn.loop = true;
isstart = true;
myBuffer = buffer;
absn.start(0 , second||0);
starttime = new Date();
}
document.getElementById("start").onclick = function(){
if(isstart) return;
playMusic(myBuffer , bftime)
}
document.getElementById("stop").onclick = function(){
if(!isstart) return;
absn.stop()
bftime += (new Date()-starttime)/1000;
isstart = false;
}
var tgs = [],tgn = 35,jg = 4,ot = 0,outcanvas = null;
var grd=ctx.createLinearGradient(0,110,0,270);
grd.addColorStop(0,"red");
grd.addColorStop(0.3,"yellow");
grd.addColorStop(1,"#00E800");
function initAnimation(){
outcanvas = document.createElement("canvas");
outcanvas.width = canvas.width;
outcanvas.height = canvas.height/2;
var array = new Uint8Array(analyser.frequencyBinCount);
analyser.getByteFrequencyData(array);
var w = array.length/tgn-jg;
for(var i=0;i<tgn;i++){
tgs.push(new retangle(w , 5 , (i*(array.length/tgn)) , canvas.height/2))
}
ot = new Date()
animate()
}
function animate(){
var array = new Uint8Array(analyser.frequencyBinCount);
analyser.getByteFrequencyData(array);
ctx.clearRect(0,0,canvas.width,canvas.height);
var nt = new Date();
for(var i=0;i<tgs.length;i++){
tgs[i].update(array[~~(i*array.length/tgn)], (nt-ot)/1000)
}
copy()
ot = nt;
RAF(animate)
}
function copy(){
var outctx = outcanvas.getContext("2d");
var imgdata = ctx.getImageData(0,0,canvas.width,canvas.height/2);
for(var i=0;i<imgdata.data.length;i+=4){
imgdata.data[i+3] = 50;
}
outctx.putImageData(imgdata , 0 , 0)
ctx.save()
ctx.translate(canvas.width/2,canvas.height/2);
ctx.rotate(Math.PI)
ctx.scale(-1,1)
ctx.drawImage(outcanvas , -canvas.width/2 , -canvas.height/2)
ctx.restore()
}
var retangle = function(w,h,x,y){
this.w = w;
this.h = h;
this.x = x;
this.y = y;
this.jg = 3;
this.power = 0;
this.dy = y;
this.dv = 100;
this.num = 0;
this.a = Math.random()*50+100
this.b = Math.random()*50+120
}
retangle.prototype = {
update:function(power,times){
this.power = power;
this.num = ~~(this.power/this.h + 0.5);
if(this.power > this.y-(this.dy+this.h)){
this.dy = this.y-this.power-this.h-1;
}else if(this.dy+this.h>this.y){
this.dy = this.y-this.h
}else {
this.dy += this.dv*times
}
this.draw();
},
draw:function(){
ctx.fillStyle = grd;
var h = (~~(this.power/(this.h+this.jg)))*(this.h+this.jg);
ctx.fillRect(this.x , this.y-h, this.w , h)
for(var i=0;i<this.num;i++){
var y = this.y-i*(this.h+this.jg);
ctx.clearRect(this.x-1 , y , this.w+2 , this.jg);
}
ctx.fillStyle = "#950000"
ctx.fillRect(this.x , this.dy , this.w , this.h);
}
}
</script>
</body></html>