webrtc打开默认音频设备

1、main.js

核心代码：

navigator.mediaDevices.getUserMedia(constraints).then(handleSuccess).catch(handleError);

/*
 *  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 audio = document.querySelector('audio');

const constraints = window.constraints = {
  audio: true,
  video: false
};

function handleSuccess(stream) {
  const audioTracks = stream.getAudioTracks();
  console.log('Got stream with constraints:', constraints);
  console.log('Using audio device: ' + audioTracks[0].label);
  stream.oninactive = function() {
    console.log('Stream ended');
  };
  window.stream = stream; // make variable available to browser console
  audio.srcObject = stream;
}

function handleError(error) {
  console.log('navigator.MediaDevices.getUserMedia error: ', error.message, error.name);
}

navigator.mediaDevices.getUserMedia(constraints).then(handleSuccess).catch(handleError);

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>gUM audio</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="main.css">

</head>

<body>

<div id="container">

    <h1><a href="//webrtc.github.io/samples/" title="WebRTC samples homepage">WebRTC samples</a> <span>getUserMedia, audio only</span>
    </h1>

    <audio id="gum-local" controls autoplay></audio>

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

    <p>Render the audio stream from an audio-only <code>getUserMedia()</code> call with an audio element.</p>

    <p>The <code>MediaStream</code> object <code><em>stream</em></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/audio"
       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="main2.js"></script>

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

</body>
</html>

webrtc打开默认音频设备

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