@l5i/dashjs/build/es5/src/streaming/rules/abr/SwitchHistoryRule.js

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

'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 _SwitchRequest=require('../SwitchRequest');var _SwitchRequest2=_interopRequireDefault(_SwitchRequest);function SwitchHistoryRule(){var context=this.context;var instance=undefined,logger=undefined; //MAX_SWITCH is the number of drops made. It doesn't consider the size of the drop.
var MAX_SWITCH=0.075; //Before this number of switch requests(no switch or actual), don't apply the rule.
//must be < SwitchRequestHistory SWITCH_REQUEST_HISTORY_DEPTH to enable rule
var SAMPLE_SIZE=6;function setup(){logger = (0,_coreDebug2['default'])(context).getInstance().getLogger(instance);}function getMaxIndex(rulesContext){var switchRequestHistory=rulesContext?rulesContext.getSwitchHistory():null;var switchRequests=switchRequestHistory?switchRequestHistory.getSwitchRequests():[];var drops=0;var noDrops=0;var dropSize=0;var switchRequest=(0,_SwitchRequest2['default'])(context).create();for(var i=0;i < switchRequests.length;i++) {if(switchRequests[i] !== undefined){drops += switchRequests[i].drops;noDrops += switchRequests[i].noDrops;dropSize += switchRequests[i].dropSize;if(drops + noDrops >= SAMPLE_SIZE && drops / noDrops > MAX_SWITCH){switchRequest.quality = i > 0 && switchRequests[i].drops > 0?i - 1:i;switchRequest.reason = {index:switchRequest.quality,drops:drops,noDrops:noDrops,dropSize:dropSize};logger.info('Switch history rule index: ' + switchRequest.quality + ' samples: ' + (drops + noDrops) + ' drops: ' + drops);break;}}}return switchRequest;}instance = {getMaxIndex:getMaxIndex};setup();return instance;}SwitchHistoryRule.__dashjs_factory_name = 'SwitchHistoryRule';exports['default'] = _coreFactoryMaker2['default'].getClassFactory(SwitchHistoryRule);module.exports = exports['default'];
//# sourceMappingURL=SwitchHistoryRule.js.map