wcheng81
/
jtBaseApp


			
							123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109
							<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>JSDoc: Source: create-text-tracks-if-necessary.js</title>

    <script src="scripts/prettify/prettify.js"> </script>
    <script src="scripts/prettify/lang-css.js"> </script>
    <!--[if lt IE 9]>
      <script src="//html5shiv.googlecode.com/svn/trunk/html5.js"></script>
    <![endif]-->
    <link type="text/css" rel="stylesheet" href="styles/prettify-tomorrow.css">
    <link type="text/css" rel="stylesheet" href="styles/jsdoc-default.css">
</head>

<body>

<div id="main">

    <h1 class="page-title">Source: create-text-tracks-if-necessary.js</h1>

    
    <section>
        <article>
            <pre class="prettyprint source linenums"><code>/**
 * @file create-text-tracks-if-necessary.js
 */

/**
 * Create text tracks on video.js if they exist on a segment.
 *
 * @param {Object} sourceBuffer the VSB or FSB
 * @param {Object} mediaSource the HTML or Flash media source
 * @param {Object} segment the segment that may contain the text track
 * @private
 */
const createTextTracksIfNecessary = function(sourceBuffer, mediaSource, segment) {
  const player = mediaSource.player_;

  // create an in-band caption track if one is present in the segment
  if (segment.captions &amp;&amp;
      segment.captions.length) {
    if (!sourceBuffer.inbandTextTracks_) {
      sourceBuffer.inbandTextTracks_ = {};
    }

    for (let trackId in segment.captionStreams) {
      if (!sourceBuffer.inbandTextTracks_[trackId]) {
        player.tech_.trigger({type: 'usage', name: 'hls-608'});
        let track = player.textTracks().getTrackById(trackId);

        if (track) {
          // Resuse an existing track with a CC# id because this was
          // very likely created by videojs-contrib-hls from information
          // in the m3u8 for us to use
          sourceBuffer.inbandTextTracks_[trackId] = track;
        } else {
          // Otherwise, create a track with the default `CC#` label and
          // without a language
          sourceBuffer.inbandTextTracks_[trackId] = player.addRemoteTextTrack({
            kind: 'captions',
            id: trackId,
            label: trackId
          }, false).track;
        }
      }
    }
  }

  if (segment.metadata &amp;&amp;
      segment.metadata.length &amp;&amp;
      !sourceBuffer.metadataTrack_) {
    sourceBuffer.metadataTrack_ = player.addRemoteTextTrack({
      kind: 'metadata',
      label: 'Timed Metadata'
    }, false).track;
    sourceBuffer.metadataTrack_.inBandMetadataTrackDispatchType =
      segment.metadata.dispatchType;
  }
};

export default createTextTracksIfNecessary;
</code></pre>
        </article>
    </section>


</div>

<nav>
    <h2><a href="index.html">Home</a></h2><h3>Classes</h3><ul><li><a href="FlashMediaSource.html">FlashMediaSource</a></li><li><a href="FlashSourceBuffer.html">FlashSourceBuffer</a></li><li><a href="HtmlMediaSource.html">HtmlMediaSource</a></li><li><a href="MessageHandlers.html">MessageHandlers</a></li><li><a href="VirtualSourceBuffer.html">VirtualSourceBuffer</a></li></ul><h3>Global</h3><ul><li><a href="global.html#abort">abort</a></li><li><a href="global.html#addSourceBuffer">addSourceBuffer</a></li><li><a href="global.html#appendBuffer">appendBuffer</a></li><li><a href="global.html#appendGopInfo_">appendGopInfo_</a></li><li><a href="global.html#endOfStream">endOfStream</a></li><li><a href="global.html#FlashTransmuxerWorker">FlashTransmuxerWorker</a></li><li><a href="global.html#get">get</a></li><li><a href="global.html#gopsSafeToAlignWith">gopsSafeToAlignWith</a></li><li><a href="global.html#MediaSource">MediaSource</a></li><li><a href="global.html#open">open</a></li><li><a href="global.html#remove">remove</a></li><li><a href="global.html#removeGopBuffer">removeGopBuffer</a></li><li><a href="global.html#set">set</a></li><li><a href="global.html#supportsNativeMediaSources">supportsNativeMediaSources</a></li><li><a href="global.html#TransmuxerWorker">TransmuxerWorker</a></li><li><a href="global.html#updateGopBuffer">updateGopBuffer</a></li><li><a href="global.html#URL">URL</a></li></ul>
</nav>

<br class="clear">

<footer>
    Documentation generated by <a href="https://github.com/jsdoc3/jsdoc">JSDoc 3.5.4</a> on Thu Nov 02 2017 12:03:25 GMT-0400 (EDT)
</footer>

<script> prettyPrint(); </script>
<script src="scripts/linenumber.js"> </script>
</body>
</html>