/****************************************************************************
** libmatroska : parse Matroska files, see http://www.matroska.org/
**
** <file/class description>
**
** Copyright (C) 2002-2010 Steve Lhomme.  All rights reserved.
**
** This library is free software; you can redistribute it and/or
** modify it under the terms of the GNU Lesser General Public
** License as published by the Free Software Foundation; either
** version 2.1 of the License, or (at your option) any later version.
** 
** This library is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
** Lesser General Public License for more details.
** 
** You should have received a copy of the GNU Lesser General Public
** License along with this library; if not, write to the Free Software
** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
**
** See http://www.gnu.org/licenses/lgpl-2.1.html for LGPL licensing information.**
** Contact license@matroska.org if any conditions of this licensing are
** not clear to you.
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**********************************************************************/

/*!
	\file
	\version \$Id: KaxCluster.cpp 1228 2005-10-14 19:36:51Z robux4 $
	\author Steve Lhomme     <robux4 @ users.sf.net>
*/
#include "matroska/KaxCluster.h"
#include "matroska/KaxBlock.h"
#include "matroska/KaxContexts.h"
#include "matroska/KaxSegment.h"
#include "matroska/KaxDefines.h"

// sub elements
START_LIBMATROSKA_NAMESPACE

KaxCluster::KaxCluster(EBML_EXTRA_DEF)
	:EbmlMaster(EBML_CLASS_SEMCONTEXT(KaxCluster) EBML_DEF_SEP EBML_EXTRA_CALL)
	,currentNewBlock(NULL)
	,ParentSegment(NULL)
	,bFirstFrameInside(false)
	,bPreviousTimecodeIsSet(false)
	,bTimecodeScaleIsSet(false)
	,bSilentTracksUsed(false)
{}

KaxCluster::KaxCluster(const KaxCluster & ElementToClone) 
 :EbmlMaster(ElementToClone)
 ,bSilentTracksUsed(ElementToClone.bSilentTracksUsed)
{
	// update the parent of each children
	EBML_MASTER_ITERATOR Itr = begin();
	while (Itr != end())
	{
		if (EbmlId(**Itr) == EBML_ID(KaxBlockGroup)) {
			static_cast<KaxBlockGroup   *>(*Itr)->SetParent(*this);
		} else if (EbmlId(**Itr) == EBML_ID(KaxBlock)) {
			static_cast<KaxBlock        *>(*Itr)->SetParent(*this);
#if MATROSKA_VERSION >= 2
		} else if (EbmlId(**Itr) == EBML_ID(KaxBlockVirtual)) {
			static_cast<KaxBlockVirtual *>(*Itr)->SetParent(*this);
#endif // MATROSKA_VERSION
		}
        ++Itr;
	}
}

bool KaxCluster::AddBlockBlob(KaxBlockBlob * NewBlob)
{
	Blobs.push_back(NewBlob);
	return true;
}

bool KaxCluster::AddFrameInternal(const KaxTrackEntry & track, uint64 timecode, DataBuffer & buffer, KaxBlockGroup * & MyNewBlock, const KaxBlockGroup * PastBlock, const KaxBlockGroup * ForwBlock, LacingType lacing)
{
	if (!bFirstFrameInside) {
		bFirstFrameInside = true;
		MinTimecode = MaxTimecode = timecode;
	} else {
		if (timecode < MinTimecode)
			MinTimecode = timecode;
		if (timecode > MaxTimecode)
			MaxTimecode = timecode;
	}

	MyNewBlock = NULL;

	if (lacing == LACING_NONE || !track.LacingEnabled()) {
		currentNewBlock = NULL;
	}

	// force creation of a new block
	if (currentNewBlock == NULL || uint32(track.TrackNumber()) != uint32(currentNewBlock->TrackNumber()) || PastBlock != NULL || ForwBlock != NULL) {
		KaxBlockGroup & aNewBlock = GetNewBlock();
		MyNewBlock = currentNewBlock = &aNewBlock;
	}

	if (PastBlock != NULL) {
		if (ForwBlock != NULL) {
			if (currentNewBlock->AddFrame(track, timecode, buffer, *PastBlock, *ForwBlock, lacing)) {
				// more data are allowed in this Block
				return true;
			} else {
				currentNewBlock = NULL;
				return false;
			}
		} else {
			if (currentNewBlock->AddFrame(track, timecode, buffer, *PastBlock, lacing)) {
				// more data are allowed in this Block
				return true;
			} else {
				currentNewBlock = NULL;
				return false;
			}
		}
	} else {
		if (currentNewBlock->AddFrame(track, timecode, buffer, lacing)) {
			// more data are allowed in this Block
			return true;
		} else {
			currentNewBlock = NULL;
			return false;
		}
	}
}

bool KaxCluster::AddFrame(const KaxTrackEntry & track, uint64 timecode, DataBuffer & buffer, KaxBlockGroup * & MyNewBlock, LacingType lacing)
{
	assert(Blobs.size() == 0); // mutually exclusive for the moment
	return AddFrameInternal(track, timecode, buffer, MyNewBlock, NULL, NULL, lacing);
}

bool KaxCluster::AddFrame(const KaxTrackEntry & track, uint64 timecode, DataBuffer & buffer, KaxBlockGroup * & MyNewBlock, const KaxBlockGroup & PastBlock, LacingType lacing)
{
	assert(Blobs.size() == 0); // mutually exclusive for the moment
	return AddFrameInternal(track, timecode, buffer, MyNewBlock, &PastBlock, NULL, lacing);
}

bool KaxCluster::AddFrame(const KaxTrackEntry & track, uint64 timecode, DataBuffer & buffer, KaxBlockGroup * & MyNewBlock, const KaxBlockGroup & PastBlock, const KaxBlockGroup & ForwBlock, LacingType lacing)
{
	assert(Blobs.size() == 0); // mutually exclusive for the moment
	return AddFrameInternal(track, timecode, buffer, MyNewBlock, &PastBlock, &ForwBlock, lacing);
}

/*!
	\todo only put the Blocks written in the cue entries
*/
filepos_t KaxCluster::Render(IOCallback & output, KaxCues & CueToUpdate, bool bSaveDefault)
{
	filepos_t Result = 0;
    size_t Index;
    EBML_MASTER_ITERATOR TrkItr, Itr;

	// update the Timecode of the Cluster before writing
	KaxClusterTimecode * Timecode = static_cast<KaxClusterTimecode *>(this->FindElt(EBML_INFO(KaxClusterTimecode)));
	*static_cast<EbmlUInteger *>(Timecode) = GlobalTimecode() / GlobalTimecodeScale();

	if (Blobs.size() == 0) {
		// old-school direct KaxBlockGroup

		// SilentTracks handling
		// check the parent cluster for existing tracks and see if they are contained in this cluster or not
		if (bSilentTracksUsed)
		{
			KaxTracks & MyTracks = *static_cast<KaxTracks *>(ParentSegment->FindElt(EBML_INFO(KaxTracks)));
	        for (TrkItr = MyTracks.begin(); TrkItr != MyTracks.end(); ++TrkItr)
            {
				if (EbmlId(*(*TrkItr)) == EBML_ID(KaxTrackEntry))
				{
					KaxTrackEntry & entry = *static_cast<KaxTrackEntry *>(*TrkItr);
					uint32 tracknum = entry.TrackNumber();
	                for (Itr = begin(); Itr != end(); ++Itr)
                    {
						if (EbmlId(*(*Itr)) == EBML_ID(KaxBlockGroup)) {
							KaxBlockGroup & group = *static_cast<KaxBlockGroup *>(*Itr);
							if (group.TrackNumber() == tracknum)
								break; // this track is used
						}
					}
					// the track wasn't found in this cluster
					if (Itr == end())
					{
						KaxClusterSilentTracks * SilentTracks = static_cast<KaxClusterSilentTracks *>(this->FindFirstElt(EBML_INFO(KaxClusterSilentTracks)));
						assert(SilentTracks != NULL); // the flag bSilentTracksUsed should be set when creating the Cluster
						KaxClusterSilentTrackNumber * trackelt = static_cast<KaxClusterSilentTrackNumber *>(SilentTracks->AddNewElt(EBML_INFO(KaxClusterSilentTrackNumber)));
						*static_cast<EbmlUInteger *>(trackelt) = tracknum;
					}
				}
			}
		}

		Result = EbmlMaster::Render(output, bSaveDefault);
		// For all Blocks add their position on the CueEntry
		
        for (Itr = begin(); Itr != end(); ++Itr)
        {
			if (EbmlId(*(*Itr)) == EBML_ID(KaxBlockGroup)) {
				CueToUpdate.PositionSet(*static_cast<const KaxBlockGroup *>(*Itr));
			}
		}
	} else {
		// new school, using KaxBlockBlob
		for (Index = 0; Index<Blobs.size(); Index++)
		{
#if MATROSKA_VERSION >= 2
			if (Blobs[Index]->IsSimpleBlock())
				PushElement( (KaxSimpleBlock&) *Blobs[Index] );
			else
#endif
				PushElement( (KaxBlockGroup&) *Blobs[Index] );
		}

		// SilentTracks handling
		// check the parent cluster for existing tracks and see if they are contained in this cluster or not
		if (bSilentTracksUsed)
		{
			KaxTracks & MyTracks = *static_cast<KaxTracks *>(ParentSegment->FindElt(EBML_INFO(KaxTracks)));
	        for (TrkItr = MyTracks.begin(); TrkItr != MyTracks.end(); ++TrkItr)
            {
				if (EbmlId(*(*TrkItr)) == EBML_ID(KaxTrackEntry))
				{
					KaxTrackEntry & entry = *static_cast<KaxTrackEntry *>(*TrkItr);
					uint32 tracknum = entry.TrackNumber();
					for (Index = 0; Index<Blobs.size(); Index++) {
						if (((KaxInternalBlock&)*Blobs[Index]).TrackNum() == tracknum)
								break; // this track is used
					}
					// the track wasn't found in this cluster
					if (Index == ListSize())
					{
						KaxClusterSilentTracks * SilentTracks = static_cast<KaxClusterSilentTracks *>(this->FindFirstElt(EBML_INFO(KaxClusterSilentTracks)));
						assert(SilentTracks != NULL); // the flag bSilentTracksUsed should be set when creating the Cluster
						KaxClusterSilentTrackNumber * trackelt = static_cast<KaxClusterSilentTrackNumber *>(SilentTracks->AddNewElt(EBML_INFO(KaxClusterSilentTrackNumber)));
						*static_cast<EbmlUInteger *>(trackelt) = tracknum;
					}
				}
			}
		}

		Result = EbmlMaster::Render(output, bSaveDefault);

		// For all Blocks add their position on the CueEntry
		for (Index = 0; Index<Blobs.size(); Index++) {
			CueToUpdate.PositionSet(*Blobs[Index]);
		}

		Blobs.clear();
	}

	return Result;
}

/*!
	\todo automatically choose valid timecode for the Cluster based on the previous cluster timecode (must be incremental)
*/
uint64 KaxCluster::GlobalTimecode() const
{
	assert(bPreviousTimecodeIsSet);
	uint64 result = MinTimecode;

	if (result < PreviousTimecode)
		result = PreviousTimecode + 1;
	
	return result;
}

/*!
	\brief retrieve the relative 
	\todo !!! We need a way to know the TimecodeScale
*/
int16 KaxCluster::GetBlockLocalTimecode(uint64 aGlobalTimecode) const
{
	int64 TimecodeDelay = (int64(aGlobalTimecode) - int64(GlobalTimecode())) / int64(GlobalTimecodeScale());
	assert(TimecodeDelay >= int16(0x8000) && TimecodeDelay <= int16(0x7FFF));
	return int16(TimecodeDelay);
}

uint64 KaxCluster::GetBlockGlobalTimecode(int16 GlobalSavedTimecode)
{
	if (!bFirstFrameInside) {
		KaxClusterTimecode * Timecode = static_cast<KaxClusterTimecode *>(this->FindElt(EBML_INFO(KaxClusterTimecode)));
		assert (bFirstFrameInside); // use the InitTimecode() hack for now
		MinTimecode = MaxTimecode = PreviousTimecode = *static_cast<EbmlUInteger *>(Timecode);
		bFirstFrameInside = true;
		bPreviousTimecodeIsSet = true;
	}
	return int64(GlobalSavedTimecode * GlobalTimecodeScale()) + GlobalTimecode();
}

KaxBlockGroup & KaxCluster::GetNewBlock()
{
	KaxBlockGroup & MyBlock = AddNewChild<KaxBlockGroup>(*this);
	MyBlock.SetParent(*this);
	return MyBlock;
}

void KaxCluster::ReleaseFrames()
{
    EBML_MASTER_ITERATOR Itr;
    for (Itr = begin(); Itr != end(); ++Itr)
    {
		if (EbmlId(*(*Itr)) == EBML_ID(KaxBlockGroup)) {
			static_cast<KaxBlockGroup*>(*Itr)->ReleaseFrames();
		}
	}
}

uint64 KaxCluster::GetPosition() const
{
	assert(ParentSegment != NULL);
	return ParentSegment->GetRelativePosition(*this);
}

END_LIBMATROSKA_NAMESPACE
