dashjs
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A reference client implementation for the playback of MPEG DASH via Javascript and compliant browsers.
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<html lang="en" style="font-size:16px"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1"><link rel="icon" href="https://dashif.org/img/favicon.ico"><link type="text/css" rel="stylesheet" href="jsdoc-custom.css"><title>Source: streaming/rules/abr/ABRRulesCollection.js</title><!--[if lt IE 9]>
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href="module-Settings.html">Settings</a></div></div><div class="sidebar-section-title with-arrow" data-isopen="false" id="sidebar-classes"><div>Classes</div><svg><use xlink:href="#down-icon"></use></svg></div><div class="sidebar-section-children-container"><div class="sidebar-section-children"><a href="Errors.html">Errors</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html">MediaPlayerEvents</a></div><div class="sidebar-section-children"><a href="MediaPlayerModel.html">MediaPlayerModel</a></div><div class="sidebar-section-children"><a href="MetricsReportingEvents.html">MetricsReportingEvents</a></div><div class="sidebar-section-children"><a href="MssErrors.html">MssErrors</a></div><div class="sidebar-section-children"><a href="OfflineErrors.html">OfflineErrors</a></div><div class="sidebar-section-children"><a href="OfflineEvents.html">OfflineEvents</a></div><div class="sidebar-section-children"><a href="ProtectionErrors.html">ProtectionErrors</a></div><div 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href="MediaPlayerEvents.html#event:BUFFER_LEVEL_UPDATED">BUFFER_LEVEL_UPDATED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:BUFFER_LOADED">BUFFER_LOADED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:CAN_PLAY">CAN_PLAY</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:CAN_PLAY_THROUGH">CAN_PLAY_THROUGH</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:CAPTION_CONTAINER_RESIZE">CAPTION_CONTAINER_RESIZE</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:CAPTION_RENDERED">CAPTION_RENDERED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:CONFORMANCE_VIOLATION">CONFORMANCE_VIOLATION</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:CONTENT_STEERING_REQUEST_COMPLETED">CONTENT_STEERING_REQUEST_COMPLETED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:CUE_ENTER">CUE_ENTER</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:CUE_ENTER">CUE_ENTER</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:DVB_FONT_DOWNLOAD_ADDED">DVB_FONT_DOWNLOAD_ADDED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:DVB_FONT_DOWNLOAD_COMPLETE">DVB_FONT_DOWNLOAD_COMPLETE</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:DVB_FONT_DOWNLOAD_FAILED">DVB_FONT_DOWNLOAD_FAILED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:DYNAMIC_TO_STATIC">DYNAMIC_TO_STATIC</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:ERROR">ERROR</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:EVENT_MODE_ON_RECEIVE">EVENT_MODE_ON_RECEIVE</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:EVENT_MODE_ON_START">EVENT_MODE_ON_START</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:FRAGMENT_LOADING_ABANDONED">FRAGMENT_LOADING_ABANDONED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:FRAGMENT_LOADING_COMPLETED">FRAGMENT_LOADING_COMPLETED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:FRAGMENT_LOADING_PROGRESS">FRAGMENT_LOADING_PROGRESS</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:FRAGMENT_LOADING_STARTED">FRAGMENT_LOADING_STARTED</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:INBAND_PRFT">INBAND_PRFT</a></div><div class="sidebar-section-children"><a href="MediaPlayerEvents.html#event:LOG">LOG</a></div><div class="sidebar-section-children"><a 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 class="sidebar-section-children"><a href="ProtectionEvents.html#event:KEY_ERROR">KEY_ERROR</a></div><div class="sidebar-section-children"><a href="ProtectionEvents.html#event:KEY_MESSAGE">KEY_MESSAGE</a></div><div class="sidebar-section-children"><a href="ProtectionEvents.html#event:KEY_SESSION_CLOSED">KEY_SESSION_CLOSED</a></div><div class="sidebar-section-children"><a href="ProtectionEvents.html#event:KEY_SESSION_CREATED">KEY_SESSION_CREATED</a></div><div class="sidebar-section-children"><a href="ProtectionEvents.html#event:KEY_SESSION_REMOVED">KEY_SESSION_REMOVED</a></div><div class="sidebar-section-children"><a href="ProtectionEvents.html#event:KEY_STATUSES_CHANGED">KEY_STATUSES_CHANGED</a></div><div class="sidebar-section-children"><a href="ProtectionEvents.html#event:KEY_SYSTEM_ACCESS_COMPLETE">KEY_SYSTEM_ACCESS_COMPLETE</a></div><div class="sidebar-section-children"><a href="ProtectionEvents.html#event:KEY_SYSTEM_SELECTED">KEY_SYSTEM_SELECTED</a></div><div 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class="has-anchor">streaming_rules_abr_ABRRulesCollection.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.
*/
import ThroughputRule from './ThroughputRule';
import InsufficientBufferRule from './InsufficientBufferRule';
import AbandonRequestsRule from './AbandonRequestsRule';
import DroppedFramesRule from './DroppedFramesRule';
import SwitchHistoryRule from './SwitchHistoryRule';
import BolaRule from './BolaRule';
import L2ARule from './L2ARule.js';
import LoLPRule from './lolp/LoLpRule.js';
import FactoryMaker from '../../../core/FactoryMaker';
import SwitchRequest from '../SwitchRequest';
import Constants from '../../constants/Constants';
const QUALITY_SWITCH_RULES = 'qualitySwitchRules';
const ABANDON_FRAGMENT_RULES = 'abandonFragmentRules';
function ABRRulesCollection(config) {
config = config || {};
const context = this.context;
const mediaPlayerModel = config.mediaPlayerModel;
const customParametersModel = config.customParametersModel;
const dashMetrics = config.dashMetrics;
const settings = config.settings;
let instance,
qualitySwitchRules,
abandonFragmentRules;
function initialize() {
qualitySwitchRules = [];
abandonFragmentRules = [];
if (settings.get().streaming.abr.useDefaultABRRules) {
// If L2A is used we only need this one rule
if (settings.get().streaming.abr.ABRStrategy === Constants.ABR_STRATEGY_L2A) {
qualitySwitchRules.push(
L2ARule(context).create({
dashMetrics: dashMetrics,
settings: settings
})
);
}
// If LoLP is used we only need this one rule
else if (settings.get().streaming.abr.ABRStrategy === Constants.ABR_STRATEGY_LoLP) {
qualitySwitchRules.push(
LoLPRule(context).create({
dashMetrics: dashMetrics
})
);
} else {
// Only one of BolaRule and ThroughputRule will give a switchRequest.quality !== SwitchRequest.NO_CHANGE.
// This is controlled by useBufferOccupancyABR mechanism in AbrController.
qualitySwitchRules.push(
BolaRule(context).create({
dashMetrics: dashMetrics,
mediaPlayerModel: mediaPlayerModel,
settings: settings
})
);
qualitySwitchRules.push(
ThroughputRule(context).create({
dashMetrics: dashMetrics
})
);
if (settings.get().streaming.abr.additionalAbrRules.insufficientBufferRule) {
qualitySwitchRules.push(
InsufficientBufferRule(context).create({
dashMetrics: dashMetrics,
settings
})
);
}
if (settings.get().streaming.abr.additionalAbrRules.switchHistoryRule) {
qualitySwitchRules.push(
SwitchHistoryRule(context).create()
);
}
if (settings.get().streaming.abr.additionalAbrRules.droppedFramesRule) {
qualitySwitchRules.push(
DroppedFramesRule(context).create()
);
}
if (settings.get().streaming.abr.additionalAbrRules.abandonRequestsRule) {
abandonFragmentRules.push(
AbandonRequestsRule(context).create({
dashMetrics: dashMetrics,
mediaPlayerModel: mediaPlayerModel,
settings: settings
})
);
}
}
}
// add custom ABR rules if any
const customRules = customParametersModel.getAbrCustomRules();
customRules.forEach(function (rule) {
if (rule.type === QUALITY_SWITCH_RULES) {
qualitySwitchRules.push(rule.rule(context).create());
}
if (rule.type === ABANDON_FRAGMENT_RULES) {
abandonFragmentRules.push(rule.rule(context).create());
}
});
}
function _getRulesWithChange(srArray) {
return srArray.filter(sr => sr.quality > SwitchRequest.NO_CHANGE);
}
/**
*
* @param {array} srArray
* @return {object} SwitchRequest
*/
function getMinSwitchRequest(srArray) {
const values = {};
let newSwitchReq = null;
let i,
len,
req,
quality,
reason;
if (srArray.length === 0) {
return;
}
values[SwitchRequest.PRIORITY.STRONG] = { quality: SwitchRequest.NO_CHANGE, reason: null };
values[SwitchRequest.PRIORITY.WEAK] = { quality: SwitchRequest.NO_CHANGE, reason: null };
values[SwitchRequest.PRIORITY.DEFAULT] = { quality: SwitchRequest.NO_CHANGE, reason: null };
for (i = 0, len = srArray.length; i < len; i += 1) {
req = srArray[i];
if (req.quality !== SwitchRequest.NO_CHANGE) {
// We only use the new quality in case it is lower than the already saved one or if no new quality has been selected for the respective priority
if (values[req.priority].quality === SwitchRequest.NO_CHANGE || values[req.priority].quality > req.quality) {
values[req.priority].quality = req.quality;
values[req.priority].reason = req.reason || null;
}
}
}
if (values[SwitchRequest.PRIORITY.WEAK].quality !== SwitchRequest.NO_CHANGE) {
newSwitchReq = values[SwitchRequest.PRIORITY.WEAK];
}
if (values[SwitchRequest.PRIORITY.DEFAULT].quality !== SwitchRequest.NO_CHANGE) {
newSwitchReq = values[SwitchRequest.PRIORITY.DEFAULT];
}
if (values[SwitchRequest.PRIORITY.STRONG].quality !== SwitchRequest.NO_CHANGE) {
newSwitchReq = values[SwitchRequest.PRIORITY.STRONG];
}
if (newSwitchReq) {
quality = newSwitchReq.quality;
reason = newSwitchReq.reason;
}
return SwitchRequest(context).create(quality, reason);
}
function getMaxQuality(rulesContext) {
const switchRequestArray = qualitySwitchRules.map(rule => rule.getMaxIndex(rulesContext));
const activeRules = _getRulesWithChange(switchRequestArray);
const maxQuality = getMinSwitchRequest(activeRules);
return maxQuality || SwitchRequest(context).create();
}
function shouldAbandonFragment(rulesContext, streamId) {
const abandonRequestArray = abandonFragmentRules.map(rule => rule.shouldAbandon(rulesContext, streamId));
const activeRules = _getRulesWithChange(abandonRequestArray);
const shouldAbandon = getMinSwitchRequest(activeRules);
if (shouldAbandon) {
shouldAbandon.reason.forceAbandon = true
}
return shouldAbandon || SwitchRequest(context).create();
}
function reset() {
[qualitySwitchRules, abandonFragmentRules].forEach(rules => {
if (rules && rules.length) {
rules.forEach(rule => rule.reset && rule.reset());
}
});
qualitySwitchRules = [];
abandonFragmentRules = [];
}
function getQualitySwitchRules() {
return qualitySwitchRules;
}
instance = {
initialize,
reset,
getMaxQuality,
getMinSwitchRequest,
shouldAbandonFragment,
getQualitySwitchRules
};
return instance;
}
ABRRulesCollection.__dashjs_factory_name = 'ABRRulesCollection';
const factory = FactoryMaker.getClassFactory(ABRRulesCollection);
factory.QUALITY_SWITCH_RULES = QUALITY_SWITCH_RULES;
factory.ABANDON_FRAGMENT_RULES = ABANDON_FRAGMENT_RULES;
FactoryMaker.updateSingletonFactory(ABRRulesCollection.__dashjs_factory_name, factory);
export default factory;
</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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