dashjs/build/es5/src/streaming/utils/VTTParser.js

A reference client implementation for the playback of MPEG DASH via Javascript and compliant browsers.

'use strict';Object.defineProperty(exports,"__esModule",{value:true});var _FactoryMaker=require('../../core/FactoryMaker');var _FactoryMaker2=_interopRequireDefault(_FactoryMaker);var _Debug=require('../../core/Debug');var _Debug2=_interopRequireDefault(_Debug);function _interopRequireDefault(obj){return obj&&obj.__esModule?obj:{default:obj};}/**
 * 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.
 */var WEBVTT='WEBVTT';function VTTParser(){var context=this.context;var instance=void 0,logger=void 0,regExNewLine=void 0,regExToken=void 0,regExWhiteSpace=void 0,regExWhiteSpaceWordBoundary=void 0;function setup(){logger=(0,_Debug2.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=void 0,lastStartTime=void 0;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=void 0;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=_FactoryMaker2.default.getSingletonFactory(VTTParser);
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