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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 FactoryMaker from '../../../core/FactoryMaker.js';
import SwitchRequest from '../SwitchRequest.js';
import MetricsConstants from '../../constants/MetricsConstants.js';
import Debug from '../../../core/Debug.js';
import Settings from '../../../core/Settings.js';
function ThroughputRule(config) {
config = config || {};
const context = this.context;
const dashMetrics = config.dashMetrics;
let instance,
settings,
logger;
function setup() {
logger = Debug(context).getInstance().getLogger(instance);
settings = Settings(context).getInstance();
}
function getSwitchRequest(rulesContext) {
try {
const switchRequest = SwitchRequest(context).create();
switchRequest.rule = this.getClassName();
const mediaInfo = rulesContext.getMediaInfo();
const mediaType = rulesContext.getMediaType();
const currentBufferState = dashMetrics.getCurrentBufferState(mediaType);
const scheduleController = rulesContext.getScheduleController();
const abrController = rulesContext.getAbrController();
const streamInfo = rulesContext.getStreamInfo();
const streamId = streamInfo ? streamInfo.id : null;
const isDynamic = streamInfo && streamInfo.manifestInfo ? streamInfo.manifestInfo.isDynamic : null;
const throughputController = rulesContext.getThroughputController();
const throughput = throughputController.getSafeAverageThroughput(mediaType);
const latency = throughputController.getAverageLatency(mediaType);
if (isNaN(throughput) || !currentBufferState) {
return switchRequest;
}
if (abrController.getAbandonmentStateFor(streamId, mediaType) === MetricsConstants.ALLOW_LOAD) {
if (currentBufferState.state === MetricsConstants.BUFFER_LOADED || isDynamic) {
switchRequest.representation = abrController.getOptimalRepresentationForBitrate(mediaInfo, throughput, true);
switchRequest.priority = settings.get().streaming.abr.rules.throughputRule.priority;
switchRequest.reason = {
throughput,
latency,
message:`[ThroughputRule]: Switching to Representation with bitrate ${switchRequest.representation ? switchRequest.representation.bitrateInKbit : 'n/a'} kbit/s. Throughput: ${throughput}`
};
scheduleController.setTimeToLoadDelay(0);
}
}
return switchRequest;
} catch (e) {
logger.error(e);
return SwitchRequest(context).create();
}
}
function reset() {
// no persistent information to reset
}
instance = {
getSwitchRequest,
reset
};
setup();
return instance;
}
ThroughputRule.__dashjs_factory_name = 'ThroughputRule';
export default FactoryMaker.getClassFactory(ThroughputRule);
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