dashjs
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A reference client implementation for the playback of MPEG DASH via Javascript and compliant browsers.
35 lines (34 loc) • 4.22 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.
*/import DashConstants from'../constants/DashConstants';import FactoryMaker from'../../core/FactoryMaker';import TimelineSegmentsGetter from'./TimelineSegmentsGetter';import TemplateSegmentsGetter from'./TemplateSegmentsGetter';import ListSegmentsGetter from'./ListSegmentsGetter';function SegmentsGetter(config,isDynamic){const context=this.context;let instance,timelineSegmentsGetter,templateSegmentsGetter,listSegmentsGetter;function setup(){timelineSegmentsGetter=TimelineSegmentsGetter(context).create(config,isDynamic);templateSegmentsGetter=TemplateSegmentsGetter(context).create(config,isDynamic);listSegmentsGetter=ListSegmentsGetter(context).create(config,isDynamic);}// availabilityUpperLimit parameter is not used directly by any dash.js function, but it is needed as a helper
// for other developments that extend dash.js, and provide their own transport layers (ex: P2P transport)
function getSegments(representation,requestedTime,index,onSegmentListUpdatedCallback,availabilityUpperLimit){let segments;const type=representation.segmentInfoType;// Already figure out the segments.
if(type===DashConstants.SEGMENT_BASE||type===DashConstants.BASE_URL||!isSegmentListUpdateRequired(representation,index)){segments=representation.segments;}else{if(type===DashConstants.SEGMENT_TIMELINE){segments=timelineSegmentsGetter.getSegments(representation,requestedTime,index,availabilityUpperLimit);}else if(type===DashConstants.SEGMENT_TEMPLATE){segments=templateSegmentsGetter.getSegments(representation,requestedTime,index,availabilityUpperLimit);}else if(type===DashConstants.SEGMENT_LIST){segments=listSegmentsGetter.getSegments(representation,requestedTime,index,availabilityUpperLimit);}if(onSegmentListUpdatedCallback){onSegmentListUpdatedCallback(representation,segments);}}}function isSegmentListUpdateRequired(representation,index){const segments=representation.segments;let updateRequired=false;let upperIdx,lowerIdx;if(!segments||segments.length===0){updateRequired=true;}else{lowerIdx=segments[0].availabilityIdx;upperIdx=segments[segments.length-1].availabilityIdx;updateRequired=index<lowerIdx||index>upperIdx;}return updateRequired;}instance={getSegments:getSegments};setup();return instance;}SegmentsGetter.__dashjs_factory_name='SegmentsGetter';const factory=FactoryMaker.getClassFactory(SegmentsGetter);export default factory;
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