webrtc打开默认摄像头

1.main.js

核心代码：

 const stream = await navigator.mediaDevices.getUserMedia(constraints);

/*
 *  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';

// Put variables in global scope to make them available to the browser console.
const constraints = window.constraints = {
  audio: false,
  video: true
};

function handleSuccess(stream) {
  const video = document.querySelector('video');
  const videoTracks = stream.getVideoTracks();
  console.log('Got stream with constraints:', constraints);
  console.log(`Using video device: ${videoTracks[0].label}`);
  //window.stream = stream; // make variable available to browser console
  video.srcObject = stream;
}

function handleError(error) {
  if (error.name === 'ConstraintNotSatisfiedError') {
    let v = constraints.video;
    errorMsg(`The resolution ${v.width.exact}x${v.height.exact} px is not supported by your device.`);
  } else if (error.name === 'PermissionDeniedError') {
    errorMsg('Permissions have not been granted to use your camera and ' +
      'microphone, you need to allow the page access to your devices in ' +
      'order for the demo to work.');
  }
  errorMsg(`getUserMedia error: ${error.name}`, error);
}

function errorMsg(msg, error) {
  const errorElement = document.querySelector('#errorMsg');
  errorElement.innerHTML += `<p>${msg}</p>`;
  if (typeof error !== 'undefined') {
    console.error(error);
  }
}

async function init(e) {
  try {
    const stream = await navigator.mediaDevices.getUserMedia(constraints);
    handleSuccess(stream);
    e.target.disabled = true;
  } catch (e) {
    handleError(e);
  }
}

document.querySelector('#showVideo').addEventListener('click', e => init(e));

2.index.html

<!DOCTYPE html>
<!--
 *  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.
-->
<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>getUserMedia</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">
    <link rel="stylesheet" href="../../../css/main.css">

</head>

<body>

<div id="container">
    <h1><a href="//webrtc.github.io/samples/" title="WebRTC samples homepage">WebRTC samples</a>
        <span>getUserMedia</span></h1>

    <video id="gum-local" autoplay playsinline></video>
    <button id="showVideo">Open camera</button>

    <div id="errorMsg"></div>

    <p class="warning"><strong>Warning:</strong> if you're not using headphones, pressing play will cause feedback.</p>

    <p>Display the video stream from <code>getUserMedia()</code> in a video element.</p>

    <p>The <code>MediaStream</code> object <code>stream</code> passed to the <code>getUserMedia()</code> callback is in
        global scope, so you can inspect it from the console.</p>

    <a href="https://github.com/webrtc/samples/tree/gh-pages/src/content/getusermedia/gum"
       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"></script>

<script src="../../../js/lib/ga.js"></script>

</body>
</html>

webrtc打开默认摄像头

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