webrtc

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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>
uncategorized
webrtc
http://example.com/2018-07-19 webrtc/
作者
csorz
发布于
2018年7月19日
许可协议