131 lines
4.3 KiB
HTML
131 lines
4.3 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<title>JSDoc: Source: codec-utils.js</title>
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<script src="scripts/prettify/prettify.js"> </script>
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<script src="scripts/prettify/lang-css.js"> </script>
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<!--[if lt IE 9]>
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<script src="//html5shiv.googlecode.com/svn/trunk/html5.js"></script>
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<link type="text/css" rel="stylesheet" href="styles/prettify-tomorrow.css">
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</head>
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<body>
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<div id="main">
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<h1 class="page-title">Source: codec-utils.js</h1>
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<section>
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<article>
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<pre class="prettyprint source linenums"><code>/**
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* @file codec-utils.js
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*/
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/**
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* Check if a codec string refers to an audio codec.
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*
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* @param {String} codec codec string to check
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* @return {Boolean} if this is an audio codec
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* @private
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*/
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const isAudioCodec = function(codec) {
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return (/mp4a\.\d+.\d+/i).test(codec);
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};
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/**
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* Check if a codec string refers to a video codec.
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*
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* @param {String} codec codec string to check
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* @return {Boolean} if this is a video codec
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* @private
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*/
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const isVideoCodec = function(codec) {
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return (/avc1\.[\da-f]+/i).test(codec);
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};
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/**
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* Parse a content type header into a type and parameters
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* object
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*
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* @param {String} type the content type header
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* @return {Object} the parsed content-type
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* @private
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*/
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const parseContentType = function(type) {
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let object = {type: '', parameters: {}};
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let parameters = type.trim().split(';');
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// first parameter should always be content-type
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object.type = parameters.shift().trim();
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parameters.forEach((parameter) => {
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let pair = parameter.trim().split('=');
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if (pair.length > 1) {
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let name = pair[0].replace(/"/g, '').trim();
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let value = pair[1].replace(/"/g, '').trim();
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object.parameters[name] = value;
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}
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});
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return object;
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};
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/**
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* Replace the old apple-style `avc1.<dd>.<dd>` codec string with the standard
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* `avc1.<hhhhhh>`
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*
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* @param {Array} codecs an array of codec strings to fix
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* @return {Array} the translated codec array
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* @private
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*/
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const translateLegacyCodecs = function(codecs) {
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return codecs.map((codec) => {
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return codec.replace(/avc1\.(\d+)\.(\d+)/i, function(orig, profile, avcLevel) {
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let profileHex = ('00' + Number(profile).toString(16)).slice(-2);
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let avcLevelHex = ('00' + Number(avcLevel).toString(16)).slice(-2);
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return 'avc1.' + profileHex + '00' + avcLevelHex;
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});
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});
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};
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export default {
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isAudioCodec,
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parseContentType,
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isVideoCodec,
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translateLegacyCodecs
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};
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</code></pre>
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</article>
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</section>
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</div>
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<nav>
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<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>
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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)
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