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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 SwitchRequest from '../SwitchRequest.js';
import FactoryMaker from '../../../core/FactoryMaker.js';
import Debug from '../../../core/Debug.js';
import Settings from '../../../core/Settings.js';
function AbandonRequestsRule(config) {
config = config || {};
const mediaPlayerModel = config.mediaPlayerModel;
const dashMetrics = config.dashMetrics;
const context = this.context;
const settings = Settings(context).getInstance();
let instance,
logger,
abandonDict;
function setup() {
logger = Debug(context).getInstance().getLogger(instance);
reset();
}
function shouldAbandon(rulesContext) {
const switchRequest = SwitchRequest(context).create();
switchRequest.rule = this.getClassName();
try {
if (!rulesContext) {
return switchRequest
}
const request = rulesContext.getCurrentRequest();
if (!isNaN(request.index)) {
// In case we abandoned already or do not have enough information to proceed we return here
if (request.firstByteDate === null || abandonDict.hasOwnProperty(request.index)) {
return switchRequest;
}
// Do not abandon if the buffer level is larger than the stable time
const stableBufferTime = mediaPlayerModel.getBufferTimeDefault();
const mediaType = rulesContext.getMediaType();
const bufferLevel = dashMetrics.getCurrentBufferLevel(mediaType);
if (bufferLevel > stableBufferTime) {
return switchRequest;
}
// Activate rule once we have enough samples, the initial startup time has elapsed and the download is not finished yet
const elapsedTimeSinceFirstByteInMs = Date.now() - request.firstByteDate.getTime();
if (request.traces.length >= settings.get().streaming.abr.rules.abandonRequestsRule.parameters.minThroughputSamplesThreshold &&
elapsedTimeSinceFirstByteInMs > settings.get().streaming.abr.rules.abandonRequestsRule.parameters.minSegmentDownloadTimeThresholdInMs &&
request.bytesLoaded < request.bytesTotal) {
return _getSwitchRequest(rulesContext, request, switchRequest);
}
}
return switchRequest;
} catch (e) {
logger.error(e);
return switchRequest
}
}
function _getSwitchRequest(rulesContext, request, switchRequest) {
const mediaInfo = rulesContext.getMediaInfo();
const mediaType = rulesContext.getMediaType();
// Use the traces of the request to derive the mean throughput. We ignore the first entries as they contain the latency of the request.
const downloadedBytes = request.traces.reduce((prev, curr) => prev + curr.b[0], 0) - request.traces[0].b[0];
const downloadTimeInMs = Math.max(request.traces.reduce((prev, curr) => prev + curr.d, 0) - request.traces[0].d, 1);
const throughputInKbit = Math.round((8 * downloadedBytes) / downloadTimeInMs)
const estimatedTimeOfDownloadInSeconds = Number((request.bytesTotal * 8 / throughputInKbit) / 1000).toFixed(2);
// We do not abandon if the estimated download time is below a constant multiple of the segment duration, or if we are on the lowest quality anyway.
const representation = rulesContext.getRepresentation();
const abrController = rulesContext.getAbrController();
if (estimatedTimeOfDownloadInSeconds < request.duration * settings.get().streaming.abr.rules.abandonRequestsRule.parameters.abandonDurationMultiplier || abrController.isPlayingAtLowestQuality(representation)) {
return switchRequest;
}
if (!abandonDict.hasOwnProperty(request.index)) {
const abrController = rulesContext.getAbrController();
const remainingBytesToDownload = request.bytesTotal - request.bytesLoaded;
const optimalRepresentationForBitrate = abrController.getOptimalRepresentationForBitrate(mediaInfo, throughputInKbit, true);
const currentRequestedRepresentation = request.representation;
const totalBytesForOptimalRepresentation = request.bytesTotal * optimalRepresentationForBitrate.bitrateInKbit / currentRequestedRepresentation.bitrateInKbit;
if (remainingBytesToDownload > totalBytesForOptimalRepresentation) {
switchRequest.representation = optimalRepresentationForBitrate;
switchRequest.priority = settings.get().streaming.abr.rules.abandonRequestsRule.priority;
switchRequest.reason = {
throughputInKbit,
message: `[AbandonRequestRule][${mediaType} is asking to abandon and switch to quality to ${optimalRepresentationForBitrate.absoluteIndex}. The measured bandwidth was ${throughputInKbit} kbit/s`
}
abandonDict[request.index] = true;
}
}
return switchRequest
}
function reset() {
abandonDict = {};
}
instance = {
shouldAbandon,
reset
};
setup();
return instance;
}
AbandonRequestsRule.__dashjs_factory_name = 'AbandonRequestsRule';
export default FactoryMaker.getClassFactory(AbandonRequestsRule);
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