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| <!DOCTYPE html>
<html>
<head>
<title>H5获取摄像头和麦克风</title>
<meta name="renderer" content="webkit">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0,user-scalable=no">
<!-- 图片预加载，支持firefox与chrome -->
<link rel="prefetch prerender" href="">
<script type="text/javascript" src="//public.yitong.com/libs/html5shiv/3.7.3/html5shiv.min.js"></script>
<script type="text/javascript" src="//public.yitong.com/libs/respond.js/1.4.2/respond.min.js"></script>
<script type="text/javascript" src="//public.yitong.com/libs/jquery/1.11.1/jquery.min.js"></script>
<style type="text/css">
#myVolumeText {
display: inline-block;
width:1.5em;
}
#myVolume {
display: inline-block;
height:16px;
width:0px;
background-color: greenyellow;
position: relative;
top:3px;
}
</style>
</head>
<body>
<video id="webcam"></video>
<div>当前音量：<span id="myVolumeText"></span><span id="myVolume"></span></div>
</body>
<script>
window.AudioContext = window.AudioContext window.webkitAudioContext;
//创建一个管理、播放声音的对象
var myAudioContext = new AudioContext();
//申请麦克风及摄像头权限
navigator.getUserMedia = navigator.getUserMedia navigator.webkitGetUserMedia navigator.mozGetUserMedia navigator.msGetUserMedia;
navigator.getUserMedia({
video:true,
audio:true
},function(stream){
//onSuccess
console.log("【log】获取权限成功！")
onSuccess(stream)
},function(error){
//onError
console.log("【log】获取权限失败！")
console.log("【log】错误信息:"+error.name)
})
//获取麦克风 测试麦克风
function onSuccess(stream) {
videoFun(stream)
audioFun(stream)
}
//获取摄像头 测试摄像头
function videoFun(stream){
var video = document.getElementById("webcam");
if(window.URL){
video.src = window.URL.createObjectURL(stream)
}else{
video.src = stream;
}
video.autoplay = true;
}
var liveSource,levelChecker;
//获取扬声器 测试扬声器
function audioFun(stream){
//将麦克风的声音输入这个对象
var liveSource = myAudioContext.createMediaStreamSource(stream);
//创建一个音频分析对象，采样的缓冲区大小为4096，输入和输出都是单声道
var levelChecker = myAudioContext.createScriptProcessor(4096,1,1);
//将输入对象与分析对象进行连接
liveSource.connect(levelChecker);
//将分析对象与输出对象进行连接
levelChecker.connect(myAudioContext.destination);
//开始分析音频
levelChecker.onaudioprocess = function(e) {
var buffer = e.inputBuffer.getChannelData(0); //获得缓冲区的输入音频，转换为包含了PCM通道数据的32位浮点数组
//创建变量并迭代来获取最大的音量值
var maxVal = 0;
for (var i = 0; i < buffer.length; i++) {
if (maxVal < buffer[i]) {
maxVal = buffer[i];
}
}
//显示音量值
var num = Math.round(maxVal*100)
num = (num>100?100:num)
document.getElementById("myVolume").style.width = 5*num + "px";
document.getElementById("myVolumeText").innerHTML = num;
console.log("当前音量值：" + num)
};
}
function endAudioFun(){
//将输入对象与分析对象进行连接
liveSource.disconnect(levelChecker);
//将分析对象与输出对象进行连接
levelChecker.disconnect(myAudioContext.destination);
}
</script>
</html>
|