dashjs/build/es5/src/streaming/rules/abr/AbandonRequestsRule.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 _SwitchRequest=require('../SwitchRequest');var _SwitchRequest2=_interopRequireDefault(_SwitchRequest);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};}function AbandonRequestsRule(config){config=config||{};var ABANDON_MULTIPLIER=1.8;var GRACE_TIME_THRESHOLD=500;var MIN_LENGTH_TO_AVERAGE=5;var context=this.context;var mediaPlayerModel=config.mediaPlayerModel;var dashMetrics=config.dashMetrics;var settings=config.settings;var instance=void 0,logger=void 0,fragmentDict=void 0,abandonDict=void 0,throughputArray=void 0;function setup(){logger=(0,_Debug2.default)(context).getInstance().getLogger(instance);reset();}function setFragmentRequestDict(type,id){fragmentDict[type]=fragmentDict[type]||{};fragmentDict[type][id]=fragmentDict[type][id]||{};}function storeLastRequestThroughputByType(type,throughput){throughputArray[type]=throughputArray[type]||[];throughputArray[type].push(throughput);}function shouldAbandon(rulesContext){var switchRequest=(0,_SwitchRequest2.default)(context).create(_SwitchRequest2.default.NO_CHANGE,{name:AbandonRequestsRule.__dashjs_factory_name});if(!rulesContext||!rulesContext.hasOwnProperty('getMediaInfo')||!rulesContext.hasOwnProperty('getMediaType')||!rulesContext.hasOwnProperty('getCurrentRequest')||!rulesContext.hasOwnProperty('getRepresentationInfo')||!rulesContext.hasOwnProperty('getAbrController')){return switchRequest;}var mediaInfo=rulesContext.getMediaInfo();var mediaType=rulesContext.getMediaType();var req=rulesContext.getCurrentRequest();if(!isNaN(req.index)){setFragmentRequestDict(mediaType,req.index);var stableBufferTime=mediaPlayerModel.getStableBufferTime();var bufferLevel=dashMetrics.getCurrentBufferLevel(mediaType,true);if(bufferLevel>stableBufferTime){return switchRequest;}var fragmentInfo=fragmentDict[mediaType][req.index];if(fragmentInfo===null||req.firstByteDate===null||abandonDict.hasOwnProperty(fragmentInfo.id)){return switchRequest;}//setup some init info based on first progress event
if(fragmentInfo.firstByteTime===undefined){throughputArray[mediaType]=[];fragmentInfo.firstByteTime=req.firstByteDate.getTime();fragmentInfo.segmentDuration=req.duration;fragmentInfo.bytesTotal=req.bytesTotal;fragmentInfo.id=req.index;}fragmentInfo.bytesLoaded=req.bytesLoaded;fragmentInfo.elapsedTime=new Date().getTime()-fragmentInfo.firstByteTime;if(fragmentInfo.bytesLoaded>0&&fragmentInfo.elapsedTime>0){storeLastRequestThroughputByType(mediaType,Math.round(fragmentInfo.bytesLoaded*8/fragmentInfo.elapsedTime));}if(throughputArray[mediaType].length>=MIN_LENGTH_TO_AVERAGE&&fragmentInfo.elapsedTime>GRACE_TIME_THRESHOLD&&fragmentInfo.bytesLoaded<fragmentInfo.bytesTotal){var totalSampledValue=throughputArray[mediaType].reduce(function(a,b){return a+b;},0);fragmentInfo.measuredBandwidthInKbps=Math.round(totalSampledValue/throughputArray[mediaType].length);fragmentInfo.estimatedTimeOfDownload=+(fragmentInfo.bytesTotal*8/fragmentInfo.measuredBandwidthInKbps/1000).toFixed(2);if(fragmentInfo.estimatedTimeOfDownload<fragmentInfo.segmentDuration*ABANDON_MULTIPLIER||rulesContext.getRepresentationInfo().quality===0){return switchRequest;}else if(!abandonDict.hasOwnProperty(fragmentInfo.id)){var abrController=rulesContext.getAbrController();var bytesRemaining=fragmentInfo.bytesTotal-fragmentInfo.bytesLoaded;var bitrateList=abrController.getBitrateList(mediaInfo);var newQuality=abrController.getQualityForBitrate(mediaInfo,fragmentInfo.measuredBandwidthInKbps*settings.get().streaming.abr.bandwidthSafetyFactor);var estimateOtherBytesTotal=fragmentInfo.bytesTotal*bitrateList[newQuality].bitrate/bitrateList[abrController.getQualityFor(mediaType)].bitrate;if(bytesRemaining>estimateOtherBytesTotal){switchRequest.quality=newQuality;switchRequest.reason.throughput=fragmentInfo.measuredBandwidthInKbps;switchRequest.reason.fragmentID=fragmentInfo.id;abandonDict[fragmentInfo.id]=fragmentInfo;logger.debug('( ',mediaType,'frag id',fragmentInfo.id,') is asking to abandon and switch to quality to ',newQuality,' measured bandwidth was',fragmentInfo.measuredBandwidthInKbps);delete fragmentDict[mediaType][fragmentInfo.id];}}}else if(fragmentInfo.bytesLoaded===fragmentInfo.bytesTotal){delete fragmentDict[mediaType][fragmentInfo.id];}}return switchRequest;}function reset(){fragmentDict={};abandonDict={};throughputArray=[];}instance={shouldAbandon:shouldAbandon,reset:reset};setup();return instance;}/**
 * 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.
 */AbandonRequestsRule.__dashjs_factory_name='AbandonRequestsRule';exports.default=_FactoryMaker2.default.getClassFactory(AbandonRequestsRule);
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