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A reference client implementation for the playback of MPEG DASH via Javascript and compliant browsers.
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class="has-anchor">streaming_rules_abr_InsufficientBufferRule.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 EventBus from '../../../core/EventBus';
import Events from '../../../core/events/Events';
import FactoryMaker from '../../../core/FactoryMaker';
import Debug from '../../../core/Debug';
import SwitchRequest from '../SwitchRequest';
import Constants from '../../constants/Constants';
import MetricsConstants from '../../constants/MetricsConstants';
import MediaPlayerEvents from '../../MediaPlayerEvents';
function InsufficientBufferRule(config) {
config = config || {};
const INSUFFICIENT_BUFFER_SAFETY_FACTOR = 0.5;
const SEGMENT_IGNORE_COUNT = 2;
const context = this.context;
const eventBus = EventBus(context).getInstance();
const dashMetrics = config.dashMetrics;
let instance,
logger,
bufferStateDict;
function setup() {
logger = Debug(context).getInstance().getLogger(instance);
resetInitialSettings();
eventBus.on(MediaPlayerEvents.PLAYBACK_SEEKING, _onPlaybackSeeking, instance);
eventBus.on(Events.BYTES_APPENDED_END_FRAGMENT, _onBytesAppended, instance);
}
function checkConfig() {
if (!dashMetrics || !dashMetrics.hasOwnProperty('getCurrentBufferLevel') || !dashMetrics.hasOwnProperty('getCurrentBufferState')) {
throw new Error(Constants.MISSING_CONFIG_ERROR);
}
}
/**
* If a BUFFER_EMPTY event happens, then InsufficientBufferRule returns switchRequest.quality=0 until BUFFER_LOADED happens.
* Otherwise InsufficientBufferRule gives a maximum bitrate depending on throughput and bufferLevel such that
* a whole fragment can be downloaded before the buffer runs out, subject to a conservative safety factor of 0.5.
* If the bufferLevel is low, then InsufficientBufferRule avoids rebuffering risk.
* If the bufferLevel is high, then InsufficientBufferRule give a high MaxIndex allowing other rules to take over.
* @param rulesContext
* @return {object}
*/
function getMaxIndex(rulesContext) {
const switchRequest = SwitchRequest(context).create();
if (!rulesContext || !rulesContext.hasOwnProperty('getMediaType')) {
return switchRequest;
}
checkConfig();
const mediaType = rulesContext.getMediaType();
const currentBufferState = dashMetrics.getCurrentBufferState(mediaType);
const representationInfo = rulesContext.getRepresentationInfo();
const fragmentDuration = representationInfo.fragmentDuration;
const streamInfo = rulesContext.getStreamInfo();
const streamId = streamInfo ? streamInfo.id : null;
const scheduleController = rulesContext.getScheduleController();
const isDynamic = streamInfo && streamInfo.manifestInfo && streamInfo.manifestInfo.isDynamic;
const playbackController = scheduleController.getPlaybackController();
// Don't ask for a bitrate change if there is not info about buffer state or if fragmentDuration is not defined
const lowLatencyEnabled = playbackController.getLowLatencyModeEnabled();
if (shouldIgnore(lowLatencyEnabled, mediaType) || !fragmentDuration) {
return switchRequest;
}
if (currentBufferState && currentBufferState.state === MetricsConstants.BUFFER_EMPTY) {
logger.debug('[' + mediaType + '] Switch to index 0; buffer is empty.');
switchRequest.quality = 0;
switchRequest.reason = 'InsufficientBufferRule: Buffer is empty';
} else {
const mediaInfo = rulesContext.getMediaInfo();
const abrController = rulesContext.getAbrController();
const throughputHistory = abrController.getThroughputHistory();
const bufferLevel = dashMetrics.getCurrentBufferLevel(mediaType);
const throughput = throughputHistory.getAverageThroughput(mediaType, isDynamic);
const latency = throughputHistory.getAverageLatency(mediaType);
const bitrate = throughput * (bufferLevel / fragmentDuration) * INSUFFICIENT_BUFFER_SAFETY_FACTOR;
switchRequest.quality = abrController.getQualityForBitrate(mediaInfo, bitrate, streamId, latency);
switchRequest.reason = 'InsufficientBufferRule: being conservative to avoid immediate rebuffering';
}
return switchRequest;
}
function shouldIgnore(lowLatencyEnabled, mediaType) {
return !lowLatencyEnabled && bufferStateDict[mediaType].ignoreCount > 0;
}
function resetInitialSettings() {
bufferStateDict = {};
bufferStateDict[Constants.VIDEO] = { ignoreCount: SEGMENT_IGNORE_COUNT };
bufferStateDict[Constants.AUDIO] = { ignoreCount: SEGMENT_IGNORE_COUNT };
}
function _onPlaybackSeeking() {
resetInitialSettings();
}
function _onBytesAppended(e) {
if (!isNaN(e.startTime) && (e.mediaType === Constants.AUDIO || e.mediaType === Constants.VIDEO)) {
if (bufferStateDict[e.mediaType].ignoreCount > 0) {
bufferStateDict[e.mediaType].ignoreCount--;
}
}
}
function reset() {
resetInitialSettings();
eventBus.off(MediaPlayerEvents.PLAYBACK_SEEKING, _onPlaybackSeeking, instance);
eventBus.off(Events.BYTES_APPENDED_END_FRAGMENT, _onBytesAppended, instance);
}
instance = {
getMaxIndex,
reset
};
setup();
return instance;
}
InsufficientBufferRule.__dashjs_factory_name = 'InsufficientBufferRule';
export default FactoryMaker.getClassFactory(InsufficientBufferRule);
</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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