@l5i/dashjs
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A reference client implementation for the playback of MPEG DASH via Javascript and compliant browsers.
32 lines (31 loc) • 4.28 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 _constantsConstants=require('../../constants/Constants');var _constantsConstants2=_interopRequireDefault(_constantsConstants);var _coreFactoryMaker=require('../../../core/FactoryMaker');var _coreFactoryMaker2=_interopRequireDefault(_coreFactoryMaker);function BufferLevelRule(config){config = config || {};var dashMetrics=config.dashMetrics;var metricsModel=config.metricsModel;var mediaPlayerModel=config.mediaPlayerModel;var textController=config.textController;var abrController=config.abrController;function setup(){}function execute(streamProcessor,videoTrackPresent){if(!streamProcessor){return true;}var bufferLevel=dashMetrics.getCurrentBufferLevel(metricsModel.getReadOnlyMetricsFor(streamProcessor.getType()));return bufferLevel < getBufferTarget(streamProcessor,videoTrackPresent);}function getBufferTarget(streamProcessor,videoTrackPresent){var bufferTarget=NaN;if(!streamProcessor){return bufferTarget;}var type=streamProcessor.getType();var representationInfo=streamProcessor.getRepresentationInfo();if(type === _constantsConstants2['default'].FRAGMENTED_TEXT){bufferTarget = textController.isTextEnabled()?representationInfo.fragmentDuration:0;}else if(type === _constantsConstants2['default'].AUDIO && videoTrackPresent){var videoBufferLevel=dashMetrics.getCurrentBufferLevel(metricsModel.getReadOnlyMetricsFor(_constantsConstants2['default'].VIDEO));if(isNaN(representationInfo.fragmentDuration)){bufferTarget = videoBufferLevel;}else {bufferTarget = Math.max(videoBufferLevel,representationInfo.fragmentDuration);}}else {var streamInfo=representationInfo.mediaInfo.streamInfo;if(abrController.isPlayingAtTopQuality(streamInfo)){var isLongFormContent=streamInfo.manifestInfo.duration >= mediaPlayerModel.getLongFormContentDurationThreshold();bufferTarget = isLongFormContent?mediaPlayerModel.getBufferTimeAtTopQualityLongForm():mediaPlayerModel.getBufferTimeAtTopQuality();}else {bufferTarget = mediaPlayerModel.getStableBufferTime();}}return bufferTarget;}var instance={execute:execute,getBufferTarget:getBufferTarget};setup();return instance;}BufferLevelRule.__dashjs_factory_name = 'BufferLevelRule';exports['default'] = _coreFactoryMaker2['default'].getClassFactory(BufferLevelRule);module.exports = exports['default'];
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