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* 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.js';
import InsufficientBufferRule from './InsufficientBufferRule.js';
import AbandonRequestsRule from './AbandonRequestsRule.js';
import DroppedFramesRule from './DroppedFramesRule.js';
import SwitchHistoryRule from './SwitchHistoryRule.js';
import BolaRule from './BolaRule.js';
import L2ARule from './L2ARule.js';
import LoLPRule from './lolp/LoLpRule.js';
import FactoryMaker from '../../../core/FactoryMaker.js';
import SwitchRequest from '../SwitchRequest.js';
import EventBus from '../../../core/EventBus.js';
import Events from '../../../core/events/Events.js';
import Constants from '../../constants/Constants.js';
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;
const eventBus = EventBus(context).getInstance();
let instance,
qualitySwitchRules,
abandonFragmentRules,
shouldUseBolaRuleByMediaType;
function initialize() {
qualitySwitchRules = [];
abandonFragmentRules = [];
shouldUseBolaRuleByMediaType = {};
_updateRules();
eventBus.on(Events.SETTING_UPDATED_ABR_ACTIVE_RULES, _onAbrSettingsActiveRulesUpdated, instance);
}
/**
* Adds and removes rules to/from the respective rules arrays
* @private
*/
function _updateRules() {
let qualitySwitchRulesList = Object.values(Constants.QUALITY_SWITCH_RULES)
qualitySwitchRulesList.forEach((ruleName) => {
qualitySwitchRules = _handleRuleUpdate(ruleName, qualitySwitchRules)
})
let abandonFragmentRulesList = Object.values(Constants.ABANDON_FRAGMENT_RULES)
abandonFragmentRulesList.forEach((ruleName) => {
abandonFragmentRules = _handleRuleUpdate(ruleName, abandonFragmentRules)
})
// add custom ABR rules if any
const customRules = customParametersModel.getAbrCustomRules();
customRules.forEach(function (rule) {
if (rule.type === Constants.RULES_TYPES.QUALITY_SWITCH_RULES) {
qualitySwitchRules.push(rule.rule(context).create());
}
if (rule.type === Constants.RULES_TYPES.ABANDON_FRAGMENT_RULES) {
abandonFragmentRules.push(rule.rule(context).create());
}
});
// If we still got no rule for quality switch use Throughput and Bola
if (qualitySwitchRules.length === 0) {
qualitySwitchRules.push(
BolaRule(context).create({
dashMetrics: dashMetrics,
mediaPlayerModel: mediaPlayerModel,
settings: settings
})
);
qualitySwitchRules.push(
ThroughputRule(context).create({
dashMetrics: dashMetrics
})
);
}
}
function _handleRuleUpdate(ruleName, rulesCollection) {
// we use camel case in the settings while the rules start with a capital latter. Not ideal but convert between these formats
const attribute = ruleName.charAt(0).toLowerCase() + ruleName.slice(1);
if (settings.get().streaming.abr.rules[attribute].active && !_arrayContainsRule(rulesCollection, ruleName)) {
rulesCollection.push(
_createRuleInstance(ruleName)
);
return rulesCollection
} else if (!settings.get().streaming.abr.rules[attribute].active) {
return _removeRuleFromArray(rulesCollection, ruleName)
}
return rulesCollection
}
function _createRuleInstance(rule) {
switch (rule) {
case Constants.QUALITY_SWITCH_RULES.BOLA_RULE:
return BolaRule(context).create({
dashMetrics: dashMetrics,
mediaPlayerModel: mediaPlayerModel,
settings: settings
})
case Constants.QUALITY_SWITCH_RULES.THROUGHPUT_RULE:
return ThroughputRule(context).create({
dashMetrics: dashMetrics
})
case Constants.QUALITY_SWITCH_RULES.INSUFFICIENT_BUFFER_RULE:
return InsufficientBufferRule(context).create({
dashMetrics: dashMetrics,
settings
})
case Constants.QUALITY_SWITCH_RULES.SWITCH_HISTORY_RULE:
return SwitchHistoryRule(context).create()
case Constants.QUALITY_SWITCH_RULES.DROPPED_FRAMES_RULE:
return DroppedFramesRule(context).create()
case Constants.QUALITY_SWITCH_RULES.LEARN_TO_ADAPT_RULE:
return L2ARule(context).create({
dashMetrics: dashMetrics,
settings: settings
})
case Constants.QUALITY_SWITCH_RULES.LOL_PLUS_RULE:
return LoLPRule(context).create({
dashMetrics: dashMetrics
})
case Constants.ABANDON_FRAGMENT_RULES.ABANDON_REQUEST_RULE:
return AbandonRequestsRule(context).create({
dashMetrics: dashMetrics,
mediaPlayerModel: mediaPlayerModel,
settings: settings
})
}
}
function _arrayContainsRule(arr, ruleName) {
return arr.filter((rule) => {
return rule.getClassName() === ruleName
}).length > 0
}
function _removeRuleFromArray(arr, ruleName) {
return arr.filter((rule) => {
return rule.getClassName() !== ruleName
})
}
function _getRulesWithChange(srArray) {
return srArray.filter(sr => sr.representation !== SwitchRequest.NO_CHANGE);
}
/**
*
* @param {array} srArray
* @return {object} SwitchRequest
*/
function getMinSwitchRequest(srArray) {
const values = {};
let newSwitchReq = null;
let i,
len,
currentSwitchRequest;
Iif (srArray.length === 0) {
return;
}
values[SwitchRequest.PRIORITY.STRONG] = null;
values[SwitchRequest.PRIORITY.WEAK] = null;
values[SwitchRequest.PRIORITY.DEFAULT] = null;
for (i = 0, len = srArray.length; i < len; i += 1) {
currentSwitchRequest = srArray[i];
if (currentSwitchRequest.representation !== SwitchRequest.NO_CHANGE) {
// We only use the new quality in case the bitrate is lower than the already saved one or if no new quality has been selected for the respective priority
if (values[currentSwitchRequest.priority] === null ||
(values[currentSwitchRequest.priority].representation !== SwitchRequest.NO_CHANGE && currentSwitchRequest.representation.bitrateInKbit < values[currentSwitchRequest.priority].representation.bitrateInKbit)) {
values[currentSwitchRequest.priority] = currentSwitchRequest;
}
}
}
if (values[SwitchRequest.PRIORITY.WEAK] && values[SwitchRequest.PRIORITY.WEAK].representation !== SwitchRequest.NO_CHANGE) {
newSwitchReq = values[SwitchRequest.PRIORITY.WEAK];
}
if (values[SwitchRequest.PRIORITY.DEFAULT] && values[SwitchRequest.PRIORITY.DEFAULT].representation !== SwitchRequest.NO_CHANGE) {
newSwitchReq = values[SwitchRequest.PRIORITY.DEFAULT];
}
if (values[SwitchRequest.PRIORITY.STRONG] && values[SwitchRequest.PRIORITY.STRONG].representation !== SwitchRequest.NO_CHANGE) {
newSwitchReq = values[SwitchRequest.PRIORITY.STRONG];
}
return newSwitchReq
}
function getBestPossibleSwitchRequest(rulesContext) {
if (!rulesContext) {
return SwitchRequest(context).create()
}
// Only Throughput or Bola are active at the same time.
const activeQualitySwitchRules = qualitySwitchRules.filter((rule) => {
const ruleName = rule.getClassName();
if (ruleName !== Constants.QUALITY_SWITCH_RULES.BOLA_RULE && ruleName !== Constants.QUALITY_SWITCH_RULES.THROUGHPUT_RULE) {
return true
}
const mediaType = rulesContext.getMediaType();
return (shouldUseBolaRuleByMediaType[mediaType] && ruleName === Constants.QUALITY_SWITCH_RULES.BOLA_RULE) || (!shouldUseBolaRuleByMediaType[mediaType] && ruleName === Constants.QUALITY_SWITCH_RULES.THROUGHPUT_RULE)
})
const switchRequestArray = activeQualitySwitchRules.map(rule => rule.getSwitchRequest(rulesContext));
const activeRules = _getRulesWithChange(switchRequestArray);
const maxQuality = getMinSwitchRequest(activeRules);
return maxQuality || SwitchRequest(context).create();
}
function shouldAbandonFragment(rulesContext) {
if (!rulesContext) {
return SwitchRequest(context).create()
}
const abandonRequestArray = abandonFragmentRules.map(rule => rule.shouldAbandon(rulesContext));
const activeRules = _getRulesWithChange(abandonRequestArray);
const shouldAbandon = getMinSwitchRequest(activeRules);
if (shouldAbandon && shouldAbandon.reason) {
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 = [];
shouldUseBolaRuleByMediaType = {}
eventBus.off(Events.SETTING_UPDATED_ABR_ACTIVE_RULES, _onAbrSettingsActiveRulesUpdated, instance);
}
function clearDataForStream(streamId) {
[qualitySwitchRules, abandonFragmentRules].forEach(rules => {
if (rules && rules.length) {
rules.forEach(rule => rule.clearDataForStream && typeof rule.clearDataForStream === 'function' && rule.clearDataForStream(streamId));
}
});
}
function getQualitySwitchRules() {
return qualitySwitchRules;
}
function getAbandonFragmentRules() {
return abandonFragmentRules
}
function setBolaState(mediaType, value) {
shouldUseBolaRuleByMediaType[mediaType] = value
}
function getBolaState(mediaType) {
return shouldUseBolaRuleByMediaType[mediaType]
}
function _onAbrSettingsActiveRulesUpdated() {
_updateRules()
}
function handleNewMediaInfo(newMediaInfo) {
qualitySwitchRules.forEach(rule => rule.handleNewMediaInfo && rule.handleNewMediaInfo(newMediaInfo));
abandonFragmentRules.forEach(rule => rule.handleNewMediaInfo && rule.handleNewMediaInfo(newMediaInfo));
}
instance = {
clearDataForStream,
getAbandonFragmentRules,
getBestPossibleSwitchRequest,
getBolaState,
getMinSwitchRequest,
getQualitySwitchRules,
handleNewMediaInfo,
initialize,
reset,
setBolaState,
shouldAbandonFragment,
};
return instance;
}
ABRRulesCollection.__dashjs_factory_name = 'ABRRulesCollection';
const factory = FactoryMaker.getClassFactory(ABRRulesCollection);
FactoryMaker.updateSingletonFactory(ABRRulesCollection.__dashjs_factory_name, factory);
export default factory;
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