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/*
* SegmentTemplateStream.cpp
*****************************************************************************
* Copyright (C) 2012, bitmovin Softwareentwicklung OG, All Rights Reserved
*
* Email: libdash-dev@vicky.bitmovin.net
*
* This source code and its use and distribution, is subject to the terms
* and conditions of the applicable license agreement.
*****************************************************************************/
#include "SegmentTemplateStream.h"
using namespace dash::mpd;
using namespace libdash::framework::mpd;
SegmentTemplateStream::SegmentTemplateStream(IMPD *mpd, IPeriod *period, IAdaptationSet *adaptationSet, IRepresentation *representation) :
AbstractRepresentationStream (mpd, period, adaptationSet, representation)
{
this->baseUrls = BaseUrlResolver::resolveBaseUrl(mpd, period, adaptationSet, 0, 0, 0);
this->segmentTemplate = findSegmentTemplate();
this->inSync = false;
this->currentSegment = 0;
calculateSegmentStartTimes();
}
SegmentTemplateStream::~SegmentTemplateStream()
{
}
ISegment* SegmentTemplateStream::getInitializationSegment()
{
if (this->segmentTemplate->GetInitialization())
return this->segmentTemplate->GetInitialization()->ToSegment(baseUrls);
return this->segmentTemplate->ToInitializationSegment(baseUrls, representation->GetId(), representation->GetBandwidth());
}
ISegment* SegmentTemplateStream::getIndexSegment(size_t segmentNumber)
{
/* time-based template */
if (this->segmentTemplate->GetSegmentTimeline())
{
if (this->segmentStartTimes.size() > segmentNumber)
return this->segmentTemplate->GetIndexSegmentFromTime(baseUrls, representation->GetId(), representation->GetBandwidth(), this->segmentStartTimes.at(segmentNumber));
return NULL;
}
/* number-based template */
return this->segmentTemplate->GetIndexSegmentFromNumber(baseUrls, representation->GetId(), representation->GetBandwidth(),
this->segmentTemplate->GetStartNumber() + segmentNumber);
}
ISegment* SegmentTemplateStream::getMediaSegment(size_t segmentNumber)
{
/* time-based template */
if (this->segmentTemplate->GetSegmentTimeline())
{
if(this->inSync)
{
this->currentSegment++;
if(this->currentSegment < this->segmentStartTimes.size())
return this->segmentTemplate->GetMediaSegmentFromTime(baseUrls, representation->GetId(), representation->GetBandwidth(), this->segmentStartTimes.at(this->currentSegment));
else
return NULL;
}
//Look for the start point of segment, ie: the closest lowest to segmentNumber
//adding segment offset
segmentNumber = segmentNumber + this->segmentOffset;
size_t prevSegNumber = 0;
size_t segNumber = 0;
for(segNumber = 0; segNumber < this->segmentStartTimes.size(); segNumber++)
{
if(this->segmentStartTimes.at(segNumber)/this->getTimescale() > segmentNumber)
{
segNumber = prevSegNumber;
break;
}
prevSegNumber = segNumber;
}
if(segNumber != this->segmentStartTimes.size())
{
this->inSync = true;
this->currentSegment = segNumber;
return this->segmentTemplate->GetMediaSegmentFromTime(baseUrls, representation->GetId(), representation->GetBandwidth(), this->segmentStartTimes.at(this->currentSegment));
}
return NULL;
}
/* number-based template */
return this->segmentTemplate->GetMediaSegmentFromNumber(baseUrls, representation->GetId(), representation->GetBandwidth(),
this->segmentTemplate->GetStartNumber() + segmentNumber);
}
ISegment* SegmentTemplateStream::getBitstreamSwitchingSegment ()
{
if (this->segmentTemplate->GetBitstreamSwitching())
return this->segmentTemplate->GetBitstreamSwitching()->ToSegment(baseUrls);
return this->segmentTemplate->ToBitstreamSwitchingSegment(baseUrls, representation->GetId(), representation->GetBandwidth());
}
RepresentationStreamType SegmentTemplateStream::getStreamType()
{
return SegmentList;
}
uint32_t SegmentTemplateStream::getSize()
{
if (!this->segmentStartTimes.empty())
return this->segmentStartTimes.size();
uint32_t numberOfSegments = 0;
double mediaPresentationDuration = 0;
if (this->mpd->GetType() == "static")
{
mediaPresentationDuration = TimeResolver::getDurationInSec(this->mpd->GetMediaPresentationDuration());
numberOfSegments = (uint32_t) ceil(mediaPresentationDuration / (this->segmentTemplate->GetDuration() / this->segmentTemplate->GetTimescale()));
}
else
{
numberOfSegments = UINT32_MAX - 1;
}
return numberOfSegments;
}
uint32_t SegmentTemplateStream::getTimescale ()
{
return this->segmentTemplate->GetTimescale();
}
uint32_t SegmentTemplateStream::getAverageSegmentDuration()
{
/* TODO calculate average segment durations for SegmentTimeline */
return this->averageDuration;
// return this->segmentTemplate->GetDuration();
}
ISegmentTemplate* SegmentTemplateStream::findSegmentTemplate()
{
if (this->representation->GetSegmentTemplate())
return this->representation->GetSegmentTemplate();
if (this->adaptationSet->GetSegmentTemplate())
return this->adaptationSet->GetSegmentTemplate();
if (this->period->GetSegmentTemplate())
return this->period->GetSegmentTemplate();
return NULL;
}
void SegmentTemplateStream::calculateSegmentStartTimes()
{
if (!this->segmentTemplate->GetSegmentTimeline())
return;
size_t numOfTimelines = 0;
uint32_t segStartTime = 0;
uint32_t segDuration = 0;
size_t repeatCount = 0;
uint32_t totalDuration = 0;
numOfTimelines = this->segmentTemplate->GetSegmentTimeline()->GetTimelines().size();
for (size_t i = 0; i < numOfTimelines; i++)
{
repeatCount = this->segmentTemplate->GetSegmentTimeline()->GetTimelines().at(i)->GetRepeatCount();
segStartTime = this->segmentTemplate->GetSegmentTimeline()->GetTimelines().at(i)->GetStartTime();
segDuration = this->segmentTemplate->GetSegmentTimeline()->GetTimelines().at(i)->GetDuration();
totalDuration = totalDuration + segDuration;
if (repeatCount > 0)
{
for (size_t j = 0; j <= repeatCount; j++)
{
if (segStartTime > 0)
{
this->segmentStartTimes.push_back(segStartTime + segDuration * j);
}
else
{
/* TODO: implement if SegmentTemplate.SegmentTimeline.S@t is not specified */
}
}
}
else
{
this->segmentStartTimes.push_back(segStartTime);
}
}
this->averageDuration = totalDuration / numOfTimelines;
}
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