js柱状图实时显示麦克风输入音量效果代码-html代码-BFW代码库

js柱状图实时显示麦克风输入音量效果代码

代码语言：html

所属分类：多媒体

代码描述：js柱状图实时显示麦克风输入音量效果代码

下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开

<!DOCTYPE html>
<html lang="en">

<head>

    <meta charset="UTF-8">



    <style>
        body {
            color: #888;
            background: #262626;
            margin: 0;
            padding: 40px;
            text-align: center;
            font-family: "helvetica Neue", Helvetica, Arial, sans-serif;
        }

        #canvas {
            width: 100px;
            height: 100px;
            position: absolute;
            top: 150px;
            left: 45%;
            text-align: center;
        }
    </style>



</head>

<body>
    <h3>VU meter from mic input (getUserMedia API)</h3>
   
    <canvas id="canvas" width="150" height="300" style='background:blue'></canvas>


    <script type="text/javascript" src="//repo.bfw.wiki/bfwrepo/js/jquery-3.2.1.min.js"></script>
    <script>

            console.log ("starting...");
            navigator.getUserMedia = navigator.getUserMedia ||
            navigator.webkitGetUserMedia ||
            navigator.mozGetUserMedia;
            if (navigator.getUserMedia) {
                navigator.getUserMedia({
                    audio: true
                },
                    function(stream) {
                        audioContext = new AudioContext();
                        analyser = audioContext.createAnalyser();
                        microphone = audioContext.createMediaStreamSource(stream);
                        javascriptNode = audioContext.createScriptProcessor(2048, 1, 1);

                        analyser.smoothingTimeConstant = 0.8;
                        analyser.fftSize = 1024;

                      .........完整代码请登录后点击上方下载按钮下载查看