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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 EventBus from '../../../core/EventBus.js';
import Events from '../../../core/events/Events.js';
import FactoryMaker from '../../../core/FactoryMaker.js';
import Debug from '../../../core/Debug.js';
import SwitchRequest from '../SwitchRequest.js';
import Constants from '../../constants/Constants.js';
import MetricsConstants from '../../constants/MetricsConstants.js';
import MediaPlayerEvents from '../../MediaPlayerEvents.js';
import Settings from '../../../core/Settings.js';
function InsufficientBufferRule(config) {
config = config || {};
const context = this.context;
const eventBus = EventBus(context).getInstance();
const dashMetrics = config.dashMetrics;
const settings = Settings(context).getInstance();
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);
}
/**
* 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 getSwitchRequest(rulesContext) {
const switchRequest = SwitchRequest(context).create();
switchRequest.rule = this.getClassName();
if (!rulesContext || !rulesContext.hasOwnProperty('getMediaType')) {
return switchRequest;
}
const mediaType = rulesContext.getMediaType();
const currentBufferState = dashMetrics.getCurrentBufferState(mediaType);
const voRepresentation = rulesContext.getRepresentation();
const fragmentDuration = voRepresentation.fragmentDuration;
const scheduleController = rulesContext.getScheduleController();
const playbackController = scheduleController.getPlaybackController();
if (!_shouldExecuteRule(playbackController, mediaType, fragmentDuration)) {
return switchRequest;
}
const mediaInfo = rulesContext.getMediaInfo();
const abrController = rulesContext.getAbrController();
if (currentBufferState && currentBufferState.state === MetricsConstants.BUFFER_EMPTY) {
logger.debug('[' + mediaType + '] Switch to index 0; buffer is empty.');
switchRequest.representation = abrController.getOptimalRepresentationForBitrate(mediaInfo, 0, true);
switchRequest.reason = {
message: '[InsufficientBufferRule]: Switching to lowest Representation because buffer is empty'
};
} else E{
const throughputController = rulesContext.getThroughputController();
const bufferLevel = dashMetrics.getCurrentBufferLevel(mediaType);
const throughput = throughputController.getAverageThroughput(mediaType, null, NaN);
const safeThroughput = throughput * settings.get().streaming.abr.rules.insufficientBufferRule.parameters.throughputSafetyFactor;
const bitrate = safeThroughput * bufferLevel / fragmentDuration
if (isNaN(bitrate) || bitrate <= 0) {
return switchRequest
}
switchRequest.representation = abrController.getOptimalRepresentationForBitrate(mediaInfo, bitrate, true);
switchRequest.priority = settings.get().streaming.abr.rules.insufficientBufferRule.priority;
switchRequest.reason = {
message: '[InsufficientBufferRule]: Limiting maximum bitrate to avoid a buffer underrun.',
bitrate
};
}
return switchRequest;
}
function _shouldExecuteRule(playbackController, mediaType, fragmentDuration) {
const lowLatencyEnabled = playbackController.getLowLatencyModeEnabled();
return !lowLatencyEnabled && bufferStateDict[mediaType].ignoreCount <= 0 && fragmentDuration;
}
function _resetInitialSettings() {
const segmentIgnoreCount = settings.get().streaming.abr.rules.insufficientBufferRule.parameters.segmentIgnoreCount
bufferStateDict = {};
bufferStateDict[Constants.VIDEO] = { ignoreCount: segmentIgnoreCount };
bufferStateDict[Constants.AUDIO] = { ignoreCount: segmentIgnoreCount };
bufferStateDict[Constants.ENHANCEMENT] = { ignoreCount: segmentIgnoreCount };
}
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 = {
getSwitchRequest,
reset
};
setup();
return instance;
}
InsufficientBufferRule.__dashjs_factory_name = 'InsufficientBufferRule';
export default FactoryMaker.getClassFactory(InsufficientBufferRule);
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