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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 "BufferBasedAdaptationWithRateBased.h"
#include<stdio.h>
using namespace dash::mpd;
using namespace libdash::framework::adaptation;
using namespace libdash::framework::input;
using namespace libdash::framework::mpd;
BufferBasedAdaptationWithRateBased::BufferBasedAdaptationWithRateBased(IMPD *mpd, IPeriod *period, IAdaptationSet *adaptationSet, bool isVid, struct AdaptationParameters *params) :
AbstractAdaptationLogic(mpd, period, adaptationSet, isVid)
{
this->alphaRate = params->Adaptech_Alpha;
this->reservoirThreshold = params->Adaptech_FirstThreshold;
this->maxThreshold = params->Adaptech_SecondThreshold;
this->switchUpThreshold = params->Adaptech_SwitchUpThreshold;
this->slackParam = params->Adaptech_SlackParameter;
std::vector<IRepresentation* > representations = this->adaptationSet->GetRepresentation();
this->m_count = 0;
this->instantBw = 0;
this->averageBw = 0;
this->representation = this->adaptationSet->GetRepresentation().at(0);
this->multimediaManager = NULL;
this->lastBufferFill = 0;
this->bufferEOS = false;
this->shouldAbort = false;
this->isCheckedForReceiver = false;
this->myQuality = 0;
Debug("BufferRateBasedParams:\talpha:%f\tfirst threshold: %f\tsecond threshold: %f\tswitch-up margin: %d\tSlack: %f\n",this->alphaRate, (double)reservoirThreshold/100, (double)maxThreshold/100, this->switchUpThreshold, this->slackParam);
Debug("Buffer Adaptation: STARTED\n");
}
BufferBasedAdaptationWithRateBased::~BufferBasedAdaptationWithRateBased ()
{
}
LogicType BufferBasedAdaptationWithRateBased::getType()
{
return adaptation::BufferBased;
}
bool BufferBasedAdaptationWithRateBased::isUserDependent()
{
return false;
}
bool BufferBasedAdaptationWithRateBased::isRateBased()
{
return true;
}
bool BufferBasedAdaptationWithRateBased::isBufferBased()
{
return true;
}
void BufferBasedAdaptationWithRateBased::setMultimediaManager(viper::managers::IMultimediaManagerBase *_mmManager)
{
this->multimediaManager = _mmManager;
}
void BufferBasedAdaptationWithRateBased::notifyBitrateChange()
{
if(this->multimediaManager)
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);
//Should Abort is done here to avoid race condition with DASHReceiver::DoBuffering()
if(this->shouldAbort)
{
this->multimediaManager->shouldAbort(this->isVideo);
}
this->shouldAbort = false;
}
uint64_t BufferBasedAdaptationWithRateBased::getBitrate()
{
return this->currentBitrate;
}
void BufferBasedAdaptationWithRateBased::setBitrate(uint32_t bufferFill)
{
uint32_t phi1, phi2;
std::vector<IRepresentation *> representations;
representations = this->adaptationSet->GetRepresentation();
size_t i = 0;
Debug("bufferlevel: %u, instant rate %lu, average rate %lu\n", bufferFill, this->instantBw, this->averageBw);
phi1 = 0;
phi2 = 0;
while(i < representations.size())
{
if(phi1 == 0 && representations.at(i)->GetBandwidth() > slackParam * this->instantBw)
{
phi1 = representations.at((i == 0) ? i : i -1)->GetBandwidth();
}
if(phi2 == 0 && representations.at(i)->GetBandwidth() > slackParam * this->averageBw)
{
phi2 = representations.at((i == 0) ? i : i -1)->GetBandwidth();
}
i++;
}
if(!phi1)
phi1 = representations.at(representations.size() - 1)->GetBandwidth();
if(!phi2)
phi2 = representations.at(representations.size() - 1)->GetBandwidth();
if(bufferFill < this->reservoirThreshold)
{
this->m_count = 0;
this->myQuality = 0;
}
else
{
if(bufferFill < this->maxThreshold)
{
this->m_count = 0;
if(this->currentBitrate > phi1)
{
if(this->myQuality > 0)
{
this->myQuality--;
}
}
else
{
if(this->currentBitrate < phi1)
{
if(this->myQuality < representations.size() - 1)
{
this->myQuality++;
}
}
}
}
else
{ // bufferFill > this->maxThreshold
if(this->currentBitrate < phi2)
{
m_count++;
if(m_count >= switchUpThreshold && this->myQuality < representations.size() - 1)
{
this->m_count = 0;
this->myQuality++;
}
}
}
}
this->representation = representations.at(this->myQuality);
this->currentBitrate = (uint64_t) this->representation->GetBandwidth();
Debug("ADAPTATION_LOGIC:\tFor %s:\tlast_buffer: %f\tbuffer_level: %f, instantaneousBw: %lu, AverageBW: %lu, choice: %d\n",isVideo ? "video" : "audio",(double)lastBufferFill/100 , (double)bufferFill/100, this->instantBw, this->averageBw , this->myQuality);
}
void BufferBasedAdaptationWithRateBased::bitrateUpdate(uint64_t bps, uint32_t segNum)
{
Debug("rate estimation: %lu\n", bps);
this->instantBw = bps;
if(this->averageBw == 0)
{
this->averageBw = bps;
}
else
{
this->averageBw = this->alphaRate*this->averageBw + (1 - this->alphaRate)*bps;
}
}
void BufferBasedAdaptationWithRateBased::onEOS(bool value)
{
this->bufferEOS = value;
}
void BufferBasedAdaptationWithRateBased::checkedByDASHReceiver()
{
this->isCheckedForReceiver = false;
}
void BufferBasedAdaptationWithRateBased::bufferUpdate(uint32_t bufferFill, int maxC)
{
Debug("buffer update: %u\n", bufferFill);
this->setBitrate(bufferFill);
this->notifyBitrateChange();
}
void BufferBasedAdaptationWithRateBased::dLTimeUpdate(double time)
{
}
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