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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 | 1x 1x 1x | /** * 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. */ /** * Authors: * Abdelhak Bentaleb | National University of Singapore | bentaleb@comp.nus.edu.sg * Mehmet N. Akcay | Ozyegin University | necmettin.akcay@ozu.edu.tr * May Lim | National University of Singapore | maylim@comp.nus.edu.sg */ import Debug from '../../../../core/Debug.js'; import FactoryMaker from '../../../../core/FactoryMaker.js'; import LearningAbrController from './LearningAbrController.js'; import LoLpQoeEvaluator from './LoLpQoEEvaluator.js'; import SwitchRequest from '../../SwitchRequest.js'; import MetricsConstants from '../../../constants/MetricsConstants.js'; import LoLpWeightSelector from './LoLpWeightSelector.js'; import Constants from '../../../constants/Constants.js'; import Settings from '../../../../core/Settings.js'; const DWS_TARGET_LATENCY = 1.5; const DWS_BUFFER_MIN = 0.3; function LoLPRule(config) { config = config || {}; let dashMetrics = config.dashMetrics; let context = this.context; let logger, settings, instance, learningController, qoeEvaluator; function _setup() { logger = Debug(context).getInstance().getLogger(instance); learningController = LearningAbrController(context).create(); qoeEvaluator = LoLpQoeEvaluator(context).create(); settings = Settings(context).getInstance(); } function getSwitchRequest(rulesContext) { try { let switchRequest = SwitchRequest(context).create(); switchRequest.rule = this.getClassName(); let mediaType = rulesContext.getMediaInfo().type; let abrController = rulesContext.getAbrController(); const streamInfo = rulesContext.getStreamInfo(); let currentRepresentation = rulesContext.getRepresentation(); const mediaInfo = rulesContext.getMediaInfo(); const bufferStateVO = dashMetrics.getCurrentBufferState(mediaType); const scheduleController = rulesContext.getScheduleController(); const currentBufferLevel = dashMetrics.getCurrentBufferLevel(mediaType, true); const playbackController = scheduleController.getPlaybackController(); let latency = playbackController.getCurrentLiveLatency(); if ((mediaType === Constants.AUDIO)) { return switchRequest; } if (!latency) { latency = 0; } const playbackRate = playbackController.getPlaybackRate(); const throughputController = rulesContext.getThroughputController(); const throughput = throughputController.getSafeAverageThroughput(mediaType); logger.debug(`Throughput ${Math.round(throughput)} kbps`); if (isNaN(throughput) || !bufferStateVO) { return switchRequest; } if (abrController.getAbandonmentStateFor(streamInfo.id, mediaType) === MetricsConstants.ABANDON_LOAD) { return switchRequest; } // QoE parameters const possibleRepresentations = abrController.getPossibleVoRepresentationsFilteredBySettings(mediaInfo, true); let bandwidths = possibleRepresentations.map(r => r.bandwidth); let segmentDuration = rulesContext.getRepresentation().fragmentDuration; let minBitrateKbps = Math.min(...bandwidths) / 1000.0; // min bitrate level let maxBitrateKbps = Math.max(...bandwidths) / 1000.0; // max bitrate level // Learning rule pre-calculations let currentBitrate = currentRepresentation.bandwidth; let currentBitrateKbps = currentBitrate / 1000.0; let httpRequest = dashMetrics.getCurrentHttpRequest(mediaType, true); let lastFragmentDownloadTime = (httpRequest.tresponse.getTime() - httpRequest.trequest.getTime()) / 1000; let segmentRebufferTime = lastFragmentDownloadTime > segmentDuration ? lastFragmentDownloadTime - segmentDuration : 0; qoeEvaluator.setupPerSegmentQoe(segmentDuration, maxBitrateKbps, minBitrateKbps); qoeEvaluator.logSegmentMetrics(currentBitrateKbps, segmentRebufferTime, latency, playbackRate); /* * Dynamic Weights Selector (step 1/2: initialization) */ let dynamicWeightsSelector = LoLpWeightSelector(context).create({ targetLatency: DWS_TARGET_LATENCY, bufferMin: DWS_BUFFER_MIN, segmentDuration, qoeEvaluator }); /* * Select next quality */ switchRequest.representation = learningController.getNextQuality( abrController, mediaInfo, throughput * 1000, latency, currentBufferLevel, playbackRate, currentRepresentation, dynamicWeightsSelector ); switchRequest.reason = { throughput: throughput, latency: latency }; switchRequest.priority = settings.get().streaming.abr.rules.loLPRule.priority; scheduleController.setTimeToLoadDelay(0); return switchRequest; } catch (e) { throw e; } } /** * Reset objects to their initial state * @private */ function _resetInitialSettings() { learningController.reset(); qoeEvaluator.reset(); } /** * Reset the rule */ function reset() { _resetInitialSettings(); } instance = { getSwitchRequest, reset }; _setup(); return instance; } LoLPRule.__dashjs_factory_name = 'LoLPRule'; export default FactoryMaker.getClassFactory(LoLPRule); |