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/*
* Copyright (c) 2017 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "RateBasedAdaptation.h"
#include<stdio.h>
using namespace dash::mpd;
using namespace libdash::framework::adaptation;
using namespace libdash::framework::input;
using namespace libdash::framework::mpd;
RateBasedAdaptation::RateBasedAdaptation(IMPD *mpd, IPeriod *period, IAdaptationSet *adaptationSet, bool isVid, struct AdaptationParameters *params) :
AbstractAdaptationLogic(mpd, period, adaptationSet, isVid)
{
std::vector<IRepresentation* > representations = this->adaptationSet->GetRepresentation();
this->availableBitrates.clear();
for(size_t i = 0; i < representations.size(); i++)
{
this->availableBitrates.push_back((uint64_t)(representations.at(i)->GetBandwidth()));
}
this->currentBitrate = this->availableBitrates.at(0);
this->representation = representations.at(0);
this->multimediaManager = NULL;
this->alpha = params->Rate_Alpha;
Debug("RateBasedParams:\t%f\n",alpha);
this->averageBw = 0;
}
RateBasedAdaptation::~RateBasedAdaptation()
{
}
LogicType RateBasedAdaptation::getType()
{
return adaptation::RateBased;
}
bool RateBasedAdaptation::isUserDependent()
{
return false;
}
bool RateBasedAdaptation::isRateBased()
{
return true;
}
bool RateBasedAdaptation::isBufferBased()
{
return false;
}
void RateBasedAdaptation::setMultimediaManager(viper::managers::IMultimediaManagerBase *_mmManager)
{
this->multimediaManager = _mmManager;
}
void RateBasedAdaptation::notifyBitrateChange()
{
if(this->multimediaManager->isStarted() && !this->multimediaManager->isStopping())
if(this->isVideo)
this->multimediaManager->setVideoQuality(this->period, this->adaptationSet, this->representation);
else
this->multimediaManager->setAudioQuality(this->period, this->adaptationSet, this->representation);
}
uint64_t RateBasedAdaptation::getBitrate()
{
return this->currentBitrate;
}
void RateBasedAdaptation::setBitrate(uint64_t bps)
{
std::vector<IRepresentation *> representations;
representations = this->adaptationSet->GetRepresentation();
size_t i = 0;
this->ewma(bps);
for(i = 0;i < representations.size();i++)
{
if(representations.at(i)->GetBandwidth() > this->averageBw)
{
if(i > 0)
i--;
break;
}
}
if((size_t)i == (size_t)(representations.size()))
i = i-1;
Debug("ADAPTATION_LOGIC:\tFor %s:\tBW_estimation(ewma): %lu, choice: %lu\n", (this->isVideo ? "video" : "audio"), this->averageBw, i);
this->representation = representations.at(i);
this->currentBitrate = this->representation->GetBandwidth();
}
void RateBasedAdaptation::bitrateUpdate(uint64_t bps, uint32_t segNum)
{
Debug("Rate Based adaptation: speed received: %lu\n", bps);
this->setBitrate(bps);
this->notifyBitrateChange();
}
void RateBasedAdaptation::ewma(uint64_t bps)
{
if(averageBw)
{
averageBw = alpha*averageBw + (1-alpha)*bps;
}
else
{
averageBw = bps;
}
}
void RateBasedAdaptation::onEOS(bool value)
{
}
void RateBasedAdaptation::checkedByDASHReceiver()
{
}
void RateBasedAdaptation::bufferUpdate(uint32_t bufferfill, int maxC)
{
}
void RateBasedAdaptation::dLTimeUpdate(double time)
{
}
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