<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>JSDoc: Source: transmuxer-worker.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: transmuxer-worker.js</h1>
<section>
<article>
<pre class="prettyprint source linenums"><code>/**
* @file transmuxer-worker.js
*/
/**
* videojs-contrib-media-sources
*
* Copyright (c) 2015 Brightcove
* All rights reserved.
*
* Handles communication between the browser-world and the mux.js
* transmuxer running inside of a WebWorker by exposing a simple
* message-based interface to a Transmuxer object.
*/
import window from 'global/window';
import mp4 from 'mux.js/lib/mp4';
/**
* Re-emits transmuxer events by converting them into messages to the
* world outside the worker.
*
* @param {Object} transmuxer the transmuxer to wire events on
* @private
*/
const wireTransmuxerEvents = function(transmuxer) {
transmuxer.on('data', function(segment) {
// transfer ownership of the underlying ArrayBuffer
// instead of doing a copy to save memory
// ArrayBuffers are transferable but generic TypedArrays are not
// @link https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Using_web_workers#Passing_data_by_transferring_ownership_(transferable_objects)
let initArray = segment.initSegment;
segment.initSegment = {
data: initArray.buffer,
byteOffset: initArray.byteOffset,
byteLength: initArray.byteLength
};
let typedArray = segment.data;
segment.data = typedArray.buffer;
window.postMessage({
action: 'data',
segment,
byteOffset: typedArray.byteOffset,
byteLength: typedArray.byteLength
}, [segment.data]);
});
if (transmuxer.captionStream) {
transmuxer.captionStream.on('data', function(caption) {
window.postMessage({
action: 'caption',
data: caption
});
});
}
transmuxer.on('done', function(data) {
window.postMessage({ action: 'done' });
});
transmuxer.on('gopInfo', function(gopInfo) {
window.postMessage({
action: 'gopInfo',
gopInfo
});
});
};
/**
* All incoming messages route through this hash. If no function exists
* to handle an incoming message, then we ignore the message.
*
* @class MessageHandlers
* @param {Object} options the options to initialize with
*/
class MessageHandlers {
constructor(options) {
this.options = options || {};
this.init();
}
/**
* initialize our web worker and wire all the events.
*/
init() {
if (this.transmuxer) {
this.transmuxer.dispose();
}
this.transmuxer = new mp4.Transmuxer(this.options);
wireTransmuxerEvents(this.transmuxer);
}
/**
* Adds data (a ts segment) to the start of the transmuxer pipeline for
* processing.
*
* @param {ArrayBuffer} data data to push into the muxer
*/
push(data) {
// Cast array buffer to correct type for transmuxer
let segment = new Uint8Array(data.data, data.byteOffset, data.byteLength);
this.transmuxer.push(segment);
}
/**
* Recreate the transmuxer so that the next segment added via `push`
* start with a fresh transmuxer.
*/
reset() {
this.init();
}
/**
* Set the value that will be used as the `baseMediaDecodeTime` time for the
* next segment pushed in. Subsequent segments will have their `baseMediaDecodeTime`
* set relative to the first based on the PTS values.
*
* @param {Object} data used to set the timestamp offset in the muxer
*/
setTimestampOffset(data) {
let timestampOffset = data.timestampOffset || 0;
this.transmuxer.setBaseMediaDecodeTime(Math.round(timestampOffset * 90000));
}
setAudioAppendStart(data) {
this.transmuxer.setAudioAppendStart(Math.ceil(data.appendStart * 90000));
}
/**
* Forces the pipeline to finish processing the last segment and emit it's
* results.
*
* @param {Object} data event data, not really used
*/
flush(data) {
this.transmuxer.flush();
}
resetCaptions() {
this.transmuxer.resetCaptions();
}
alignGopsWith(data) {
this.transmuxer.alignGopsWith(data.gopsToAlignWith.slice());
}
}
/**
* Our web wroker interface so that things can talk to mux.js
* that will be running in a web worker. the scope is passed to this by
* webworkify.
*
* @param {Object} self the scope for the web worker
*/
const TransmuxerWorker = function(self) {
self.onmessage = function(event) {
if (event.data.action === 'init' && event.data.options) {
this.messageHandlers = new MessageHandlers(event.data.options);
return;
}
if (!this.messageHandlers) {
this.messageHandlers = new MessageHandlers();
}
if (event.data && event.data.action && event.data.action !== 'init') {
if (this.messageHandlers[event.data.action]) {
this.messageHandlers[event.data.action](event.data);
}
}
};
};
export default (self) => {
return new TransmuxerWorker(self);
};
</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>