@l5i/dashjs
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A reference client implementation for the playback of MPEG DASH via Javascript and compliant browsers.
37 lines (36 loc) • 5.53 kB
JavaScript
/**
* The copyright in this software is being made available under the BSD License,
* included below. This software may be subject to other third party and contributor
* rights, including patent rights, and no such rights are granted under this license.
*
* Copyright (c) 2013, Dash Industry Forum.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation and/or
* other materials provided with the distribution.
* * Neither the name of Dash Industry Forum nor the names of its
* contributors may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS AS IS AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/'use strict';Object.defineProperty(exports,'__esModule',{value:true});function _interopRequireDefault(obj){return obj && obj.__esModule?obj:{'default':obj};}var _coreFactoryMaker=require('../../core/FactoryMaker');var _coreFactoryMaker2=_interopRequireDefault(_coreFactoryMaker);var _coreDebug=require('../../core/Debug');var _coreDebug2=_interopRequireDefault(_coreDebug);var WEBVTT='WEBVTT';function VTTParser(){var context=this.context;var instance=undefined,logger=undefined,regExNewLine=undefined,regExToken=undefined,regExWhiteSpace=undefined,regExWhiteSpaceWordBoundary=undefined;function setup(){logger = (0,_coreDebug2['default'])(context).getInstance().getLogger(instance);regExNewLine = /(?:\r\n|\r|\n)/gm;regExToken = /-->/;regExWhiteSpace = /(^[\s]+|[\s]+$)/g;regExWhiteSpaceWordBoundary = /\s\b/g;}function parse(data){var captionArray=[];var len=undefined,lastStartTime=undefined;if(!data){return captionArray;}data = data.split(regExNewLine);len = data.length;lastStartTime = -1;for(var i=0;i < len;i++) {var item=data[i];if(item.length > 0 && item !== WEBVTT){if(item.match(regExToken)){var attributes=parseItemAttributes(item);var cuePoints=attributes.cuePoints;var styles=attributes.styles;var text=getSublines(data,i + 1);var startTime=convertCuePointTimes(cuePoints[0].replace(regExWhiteSpace,''));var endTime=convertCuePointTimes(cuePoints[1].replace(regExWhiteSpace,''));if(!isNaN(startTime) && !isNaN(endTime) && startTime >= lastStartTime && endTime > startTime){if(text !== ''){lastStartTime = startTime; //TODO Make VO external so other parsers can use.
captionArray.push({start:startTime,end:endTime,data:text,styles:styles});}else {logger.error('Skipping cue due to empty/malformed cue text');}}else {logger.error('Skipping cue due to incorrect cue timing');}}}}return captionArray;}function convertCuePointTimes(time){var timeArray=time.split(':');var len=timeArray.length - 1;time = parseInt(timeArray[len - 1],10) * 60 + parseFloat(timeArray[len]);if(len === 2){time += parseInt(timeArray[0],10) * 3600;}return time;}function parseItemAttributes(data){var vttCuePoints=data.split(regExToken);var arr=vttCuePoints[1].split(regExWhiteSpaceWordBoundary);arr.shift(); //remove first array index it is empty...
vttCuePoints[1] = arr[0];arr.shift();return {cuePoints:vttCuePoints,styles:getCaptionStyles(arr)};}function getCaptionStyles(arr){var styleObject={};arr.forEach(function(element){if(element.split(/:/).length > 1){var val=element.split(/:/)[1];if(val && val.search(/%/) != -1){val = parseInt(val.replace(/%/,''),10);}if(element.match(/align/) || element.match(/A/)){styleObject.align = val;}if(element.match(/line/) || element.match(/L/)){styleObject.line = val;}if(element.match(/position/) || element.match(/P/)){styleObject.position = val;}if(element.match(/size/) || element.match(/S/)){styleObject.size = val;}}});return styleObject;} /*
* VTT can have multiple lines to display per cuepoint.
*/function getSublines(data,idx){var i=idx;var subline='';var lineData='';var lineCount=undefined;while(data[i] !== '' && i < data.length) {i++;}lineCount = i - idx;if(lineCount > 1){for(var j=0;j < lineCount;j++) {lineData = data[idx + j];if(!lineData.match(regExToken)){subline += lineData;if(j !== lineCount - 1){subline += '\n';}}else { // caption text should not have '-->' in it
subline = '';break;}}}else {lineData = data[idx];if(!lineData.match(regExToken))subline = lineData;}return subline;}instance = {parse:parse};setup();return instance;}VTTParser.__dashjs_factory_name = 'VTTParser';exports['default'] = _coreFactoryMaker2['default'].getSingletonFactory(VTTParser);module.exports = exports['default'];
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