87 lines
2.2 KiB
JavaScript
87 lines
2.2 KiB
JavaScript
/**
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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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'use strict';
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Object.defineProperty(exports, '__esModule', {
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value: true
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});
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var isAudioCodec = function isAudioCodec(codec) {
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return (/mp4a\.\d+.\d+/i.test(codec)
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);
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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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var isVideoCodec = function isVideoCodec(codec) {
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return (/avc1\.[\da-f]+/i.test(codec)
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);
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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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var parseContentType = function parseContentType(type) {
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var object = { type: '', parameters: {} };
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var 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(function (parameter) {
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var pair = parameter.trim().split('=');
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if (pair.length > 1) {
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var _name = pair[0].replace(/"/g, '').trim();
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var 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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var translateLegacyCodecs = function translateLegacyCodecs(codecs) {
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return codecs.map(function (codec) {
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return codec.replace(/avc1\.(\d+)\.(\d+)/i, function (orig, profile, avcLevel) {
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var profileHex = ('00' + Number(profile).toString(16)).slice(-2);
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var 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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exports['default'] = {
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isAudioCodec: isAudioCodec,
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parseContentType: parseContentType,
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isVideoCodec: isVideoCodec,
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translateLegacyCodecs: translateLegacyCodecs
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};
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module.exports = exports['default']; |