WebRTC设备管理五、第二节在页面中显示获取到的设备

缺乏、安全感 2023-02-21 12:58 15阅读 0赞

index.html

<!DOCTYPE html>
    
    <html>
    <head>
    
        <meta charset="utf-8">
        <meta name="description" content="WebRTC code samples">
        <meta name="viewport" content="width=device-width, user-scalable=yes, initial-scale=1, maximum-scale=1">
        <meta itemprop="description" content="Client-side WebRTC code samples">
        <meta itemprop="image" content="../../../images/webrtc-icon-192x192.png">
        <meta itemprop="name" content="WebRTC code samples">
        <meta name="mobile-web-app-capable" content="yes">
        <meta id="theme-color" name="theme-color" content="#ffffff">
    
        <base target="_blank">
    
        <title>Select audio and video sources</title>
    
        <link rel="icon" sizes="192x192" href="../../../images/webrtc-icon-192x192.png">
        <link href="//fonts.googleapis.com/css?family=Roboto:300,400,500,700" rel="stylesheet" type="text/css">
        
    
        <style>
            div.select {
                display: inline-block;
                margin: 0 0 1em 0;
            }
    
            p.small {
                font-size: 0.7em;
            }
    
            label {
                width: 12em;
                display: inline-block;
            }
        </style>
    
    </head>
    
    <body>
    <div id="container">
    
        <h1><a href="//webrtc.github.io/samples/" title="WebRTC samples homepage">WebRTC samples</a><span>Select sources & outputs</span>
        </h1>
    
        <p>Get available audio, video sources and audio output devices from <code>mediaDevices.enumerateDevices()</code>
            then set the source for <code>getUserMedia()</code> using a <code>deviceId</code> constraint.</p>
    
        <div class="select">
            <label for="audioSource">Audio input source: </label><select id="audioSource"></select>
        </div>
    
        <div class="select">
            <label for="audioOutput">Audio output destination: </label><select id="audioOutput"></select>
        </div>
    
        <div class="select">
            <label for="videoSource">Video source: </label><select id="videoSource"></select>
        </div>
    
        <video id="video" playsinline autoplay></video>
    
        <p class="small"><b>Note:</b> If you hear a reverb sound your microphone is picking up the output of your
            speakers/headset, lower the volume and/or move the microphone further away from your speakers/headset.</p>
    
        <a href="https://github.com/webrtc/samples/tree/gh-pages/src/content/devices/input-output"
           title="View source for this page on GitHub" id="viewSource">View source on GitHub</a>
    </div>
    
    <script src="https://webrtc.github.io/adapter/adapter-latest.js"></script>
    <script src="js/main.js" async></script>
    
    <script src="./js/lib/ga.js"></script>
    </body>
    </html>

main.js

/*
    *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
    *
    *  Use of this source code is governed by a BSD-style license
    *  that can be found in the LICENSE file in the root of the source
    *  tree.
    */
    
    'use strict';
    
    const videoElement = document.querySelector('video');
    const audioInputSelect = document.querySelector('select#audioSource');
    const audioOutputSelect = document.querySelector('select#audioOutput');
    const videoSelect = document.querySelector('select#videoSource');
    const selectors = [audioInputSelect, audioOutputSelect, videoSelect];
    
    audioOutputSelect.disabled = !('sinkId' in HTMLMediaElement.prototype);
    
    function gotDevices(deviceInfos) {
      // Handles being called several times to update labels. Preserve values.
      const values = selectors.map(select => select.value);
      selectors.forEach(select => {
        while (select.firstChild) {
          select.removeChild(select.firstChild);
        }
      });
      for (let i = 0; i !== deviceInfos.length; ++i) {
        const deviceInfo = deviceInfos[i];
        const option = document.createElement('option');
        option.value = deviceInfo.deviceId;
        if (deviceInfo.kind === 'audioinput') {
          option.text = deviceInfo.label || `microphone ${audioInputSelect.length + 1}`;
          audioInputSelect.appendChild(option);
        } else if (deviceInfo.kind === 'audiooutput') {
          option.text = deviceInfo.label || `speaker ${audioOutputSelect.length + 1}`;
          audioOutputSelect.appendChild(option);
        } else if (deviceInfo.kind === 'videoinput') {
          option.text = deviceInfo.label || `camera ${videoSelect.length + 1}`;
          videoSelect.appendChild(option);
        } else {
          console.log('Some other kind of source/device: ', deviceInfo);
        }
      }
      selectors.forEach((select, selectorIndex) => {
        if (Array.prototype.slice.call(select.childNodes).some(n => n.value === values[selectorIndex])) {
          select.value = values[selectorIndex];
        }
      });
    }
    
    navigator.mediaDevices.enumerateDevices().then(gotDevices).catch(handleError);
    
    // Attach audio output device to video element using device/sink ID.
    function attachSinkId(element, sinkId) {
      if (typeof element.sinkId !== 'undefined') {
        element.setSinkId(sinkId)
          .then(() => {
            console.log(`Success, audio output device attached: ${sinkId}`);
          })
          .catch(error => {
            let errorMessage = error;
            if (error.name === 'SecurityError') {
              errorMessage = `You need to use HTTPS for selecting audio output device: ${error}`;
            }
            console.error(errorMessage);
            // Jump back to first output device in the list as it's the default.
            audioOutputSelect.selectedIndex = 0;
          });
      } else {
        console.warn('Browser does not support output device selection.');
      }
    }
    
    function changeAudioDestination() {
      const audioDestination = audioOutputSelect.value;
      attachSinkId(videoElement, audioDestination);
    }
    
    function gotStream(stream) {
      window.stream = stream; // make stream available to console
      videoElement.srcObject = stream;
      // Refresh button list in case labels have become available
      return navigator.mediaDevices.enumerateDevices();
    }
    
    function handleError(error) {
      console.log('navigator.getUserMedia error: ', error);
    }
    
    function start() {
      if (window.stream) {
        window.stream.getTracks().forEach(track => {
          track.stop();
        });
      }
      const audioSource = audioInputSelect.value;
      const videoSource = videoSelect.value;
      const constraints = {
        audio: {deviceId: audioSource ? {exact: audioSource} : undefined},
        video: {deviceId: videoSource ? {exact: videoSource} : undefined}
      };
      navigator.mediaDevices.getUserMedia(constraints).then(gotStream).then(gotDevices).catch(handleError);
    }
    
    audioInputSelect.onchange = start;
    audioOutputSelect.onchange = changeAudioDestination;
    
    videoSelect.onchange = start;
    
    start();

ga.js

(function(i, s, o, g, r, a, m) {
    i['GoogleAnalyticsObject']=r; i[r]=i[r]||function() {
      (i[r].q=i[r].q||[]).push(arguments);
    }, i[r].l=1*new Date(); a=s.createElement(o),
      m=s.getElementsByTagName(o)[0]; a.async=1; a.src=g; m.parentNode.insertBefore(a, m);
    })(window, document, 'script', '//www.google-analytics.com/analytics.js', 'ga');
    
    ga('create', 'UA-48530561-1', 'auto');
    ga('send', 'pageview');

server.js

'use strict'
    
    var http = require('http');
    var https = require('https');
    var fs = require('fs');
    
    var serveIndex = require('serve-index');
    
    var express = require('express');
    var app = express();
    
    //顺序不能换
    app.use(serveIndex('./public'));
    app.use(express.static('./public'));
    
    var options = {
    	key  : fs.readFileSync('./cert/1557605_www.learningrtc.cn.key'),
    	cert : fs.readFileSync('./cert/1557605_www.learningrtc.cn.pem') 
    }
    
    var https_server = https.createServer(options, app);
    https_server.listen(443, '0.0.0.0');
    
    var http_server = http.createServer(app);
    http_server.listen(80, '0.0.0.0');

**url前面必须https://**

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