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A reference client implementation for the playback of MPEG DASH via Javascript and compliant browsers.
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href="MediaPlayerEvents.html#event:MANIFEST_LOADED">MANIFEST_LOADED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:MANIFEST_LOADING_FINISHED">MANIFEST_LOADING_FINISHED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:MANIFEST_LOADING_STARTED">MANIFEST_LOADING_STARTED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:MANIFEST_VALIDITY_CHANGED">MANIFEST_VALIDITY_CHANGED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:METRIC_ADDED">METRIC_ADDED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:METRIC_CHANGED">METRIC_CHANGED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:METRIC_UPDATED">METRIC_UPDATED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:METRICS_CHANGED">METRICS_CHANGED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PERIOD_SWITCH_COMPLETED">PERIOD_SWITCH_COMPLETED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PERIOD_SWITCH_STARTED">PERIOD_SWITCH_STARTED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_ENDED">PLAYBACK_ENDED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_ERROR">PLAYBACK_ERROR</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_LOADED_DATA">PLAYBACK_LOADED_DATA</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_METADATA_LOADED">PLAYBACK_METADATA_LOADED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_NOT_ALLOWED">PLAYBACK_NOT_ALLOWED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_PAUSED">PLAYBACK_PAUSED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_PLAYING">PLAYBACK_PLAYING</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_PROGRESS">PLAYBACK_PROGRESS</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_RATE_CHANGED">PLAYBACK_RATE_CHANGED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_SEEKED">PLAYBACK_SEEKED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_SEEKING">PLAYBACK_SEEKING</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_STALLED">PLAYBACK_STALLED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_STARTED">PLAYBACK_STARTED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_TIME_UPDATED">PLAYBACK_TIME_UPDATED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_VOLUME_CHANGED">PLAYBACK_VOLUME_CHANGED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:PLAYBACK_WAITING">PLAYBACK_WAITING</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:QUALITY_CHANGE_RENDERED">QUALITY_CHANGE_RENDERED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:QUALITY_CHANGE_REQUESTED">QUALITY_CHANGE_REQUESTED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:REPRESENTATION_SWITCH">REPRESENTATION_SWITCH</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:STREAM_ACTIVATED">STREAM_ACTIVATED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:STREAM_DEACTIVATED">STREAM_DEACTIVATED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:STREAM_INITIALIZED">STREAM_INITIALIZED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:STREAM_INITIALIZING">STREAM_INITIALIZING</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:STREAM_TEARDOWN_COMPLETE">STREAM_TEARDOWN_COMPLETE</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:STREAM_UPDATED">STREAM_UPDATED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:TEXT_TRACK_ADDED">TEXT_TRACK_ADDED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:TEXT_TRACKS_ADDED">TEXT_TRACKS_ADDED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:THROUGHPUT_MEASUREMENT_STORED">THROUGHPUT_MEASUREMENT_STORED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:TRACK_CHANGE_RENDERED">TRACK_CHANGE_RENDERED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:TTML_PARSED">TTML_PARSED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:TTML_TO_PARSE">TTML_TO_PARSE</a></div><div class="sidebar-section-children"><a href="MetricsReportingEvents.html#event:CMCD_DATA_GENERATED">CMCD_DATA_GENERATED</a></div><div class="sidebar-section-children"><a href="OfflineEvents.html#event:OFFLINE_RECORD_FINISHED">OFFLINE_RECORD_FINISHED</a></div><div class="sidebar-section-children"><a href="OfflineEvents.html#event:OFFLINE_RECORD_LOADEDMETADATA">OFFLINE_RECORD_LOADEDMETADATA</a></div><div class="sidebar-section-children"><a href="OfflineEvents.html#event:OFFLINE_RECORD_STARTED">OFFLINE_RECORD_STARTED</a></div><div class="sidebar-section-children"><a href="OfflineEvents.html#event:OFFLINE_RECORD_STOPPED">OFFLINE_RECORD_STOPPED</a></div><div class="sidebar-section-children"><a href="ProtectionEvents.html#event:KEY_ADDED">KEY_ADDED</a></div><div 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class="has-anchor">streaming_rules_abr_lolp_LoLpRule.js</h1></header><article><pre class="prettyprint source lang-js"><code>/**
* 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';
import FactoryMaker from '../../../../core/FactoryMaker';
import LearningAbrController from './LearningAbrController';
import LoLpQoeEvaluator from './LoLpQoEEvaluator';
import SwitchRequest from '../../SwitchRequest';
import MetricsConstants from '../../../constants/MetricsConstants';
import LoLpWeightSelector from './LoLpWeightSelector';
import Constants from '../../../constants/Constants';
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,
instance,
learningController,
qoeEvaluator;
function _setup() {
logger = Debug(context).getInstance().getLogger(instance);
learningController = LearningAbrController(context).create();
qoeEvaluator = LoLpQoeEvaluator(context).create();
}
function getMaxIndex(rulesContext) {
try {
let switchRequest = SwitchRequest(context).create();
let mediaType = rulesContext.getMediaInfo().type;
let abrController = rulesContext.getAbrController();
const streamInfo = rulesContext.getStreamInfo();
let currentQuality = abrController.getQualityFor(mediaType, streamInfo.id);
const mediaInfo = rulesContext.getMediaInfo();
const bufferStateVO = dashMetrics.getCurrentBufferState(mediaType);
const scheduleController = rulesContext.getScheduleController();
const currentBufferLevel = dashMetrics.getCurrentBufferLevel(mediaType, true);
const isDynamic = streamInfo && streamInfo.manifestInfo ? streamInfo.manifestInfo.isDynamic : null;
const playbackController = scheduleController.getPlaybackController();
let latency = playbackController.getCurrentLiveLatency();
if (!rulesContext.useLoLPABR() || (mediaType === Constants.AUDIO)) {
return switchRequest;
}
if (!latency) {
latency = 0;
}
const playbackRate = playbackController.getPlaybackRate();
const throughputHistory = abrController.getThroughputHistory();
const throughput = throughputHistory.getSafeAverageThroughput(mediaType, isDynamic);
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
let bitrateList = mediaInfo.bitrateList; // [{bandwidth: 200000, width: 640, height: 360}, ...]
let segmentDuration = rulesContext.getRepresentationInfo().fragmentDuration;
let minBitrateKbps = bitrateList[0].bandwidth / 1000.0; // min bitrate level
let maxBitrateKbps = bitrateList[bitrateList.length - 1].bandwidth / 1000.0; // max bitrate level
for (let i = 0; i < bitrateList.length; i++) { // in case bitrateList is not sorted as expected
let b = bitrateList[i].bandwidth / 1000.0;
if (b > maxBitrateKbps)
maxBitrateKbps = b;
else if (b < minBitrateKbps) {
minBitrateKbps = b;
}
}
// Learning rule pre-calculations
let currentBitrate = bitrateList[currentQuality].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.quality = learningController.getNextQuality(mediaInfo, throughput * 1000, latency, currentBufferLevel, playbackRate, currentQuality, dynamicWeightsSelector);
switchRequest.reason = { throughput: throughput, latency: latency };
switchRequest.priority = SwitchRequest.PRIORITY.STRONG;
scheduleController.setTimeToLoadDelay(0);
if (switchRequest.quality !== currentQuality) {
logger.debug('[TgcLearningRule][' + mediaType + '] requesting switch to index: ', switchRequest.quality, 'Average throughput', Math.round(throughput), 'kbps');
}
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 = {
getMaxIndex,
reset
};
_setup();
return instance;
}
LoLPRule.__dashjs_factory_name = 'LoLPRule';
export default FactoryMaker.getClassFactory(LoLPRule);
</code></pre></article></section></div></div></div><div class="search-container" id="PkfLWpAbet" style="display:none"><div class="wrapper" id="iCxFxjkHbP"><button class="icon-button search-close-button" id="VjLlGakifb" aria-label="close search"><svg><use xlink:href="#close-icon"></use></svg></button><div class="search-box-c"><svg><use xlink:href="#search-icon"></use></svg> <input type="text" id="vpcKVYIppa" class="search-input" placeholder="Search..." autofocus></div><div class="search-result-c" id="fWwVHRuDuN"><span class="search-result-c-text">Type anything to view search result</span></div></div></div><div class="mobile-menu-icon-container"><button class="icon-button" id="mobile-menu" data-isopen="false" aria-label="menu"><svg><use xlink:href="#menu-icon"></use></svg></button></div><div id="mobile-sidebar" class="mobile-sidebar-container"><div class="mobile-sidebar-wrapper"><a href="/" class="sidebar-title sidebar-title-anchor">Home</a><div class="mobile-nav-links"></div><div 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