]> git.uio.no Git - u/mrichter/AliRoot.git/blobdiff - HLT/TPCLib/AliHLTTPCTrackGeometry.cxx
added AliFlatExternalTrackParam to HLT global library
[u/mrichter/AliRoot.git] / HLT / TPCLib / AliHLTTPCTrackGeometry.cxx
index f9f812472688138d4cef295430de3908f66d70ce..67866af626313f277437c026e1a527f94558f645 100644 (file)
 #include "AliHLTTPCSpacePointData.h"
 #include "AliHLTTPCClusterDataFormat.h"
 #include "AliHLTTPCSpacePointContainer.h"
+#include "AliHLTTPCHWCFSpacePointContainer.h"
 #include "AliHLTTPCDefinitions.h"
 #include "AliHLTComponent.h"
 #include "AliHLTGlobalBarrelTrack.h"
+#include "AliHLTDataDeflater.h"
+#include "AliHLTErrorGuard.h"
 #include "TMath.h"
+#include "TH2F.h"
 #include <memory>
+#include <sstream>
+using namespace std;
 
 /** ROOT macro for the implementation of ROOT specific class methods */
 ClassImp(AliHLTTPCTrackGeometry)
 
 AliHLTTPCTrackGeometry::AliHLTTPCTrackGeometry()
   : AliHLTTrackGeometry()
+  , fRawTrackPoints()
+  , fDriftTimeFactorA(0.)
+  , fDriftTimeOffsetA(0.)
+  , fDriftTimeFactorC(0.)
+  , fDriftTimeOffsetC(0.)
 {
   /// standard constructor
 }
 
 AliHLTTPCTrackGeometry::AliHLTTPCTrackGeometry(const AliHLTTPCTrackGeometry& src)
   : AliHLTTrackGeometry(src)
+  , fRawTrackPoints(src.fRawTrackPoints)
+  , fDriftTimeFactorA(0.)
+  , fDriftTimeOffsetA(0.)
+  , fDriftTimeFactorC(0.)
+  , fDriftTimeOffsetC(0.)
 {
   /// copy constructor
 }
@@ -52,6 +68,7 @@ AliHLTTPCTrackGeometry& AliHLTTPCTrackGeometry::operator=(const AliHLTTPCTrackGe
 {
   /// assignment operator
   AliHLTTrackGeometry::operator=(src);
+  fRawTrackPoints.assign(src.fRawTrackPoints.begin(), src.fRawTrackPoints.end());
   return *this;
 }
 
@@ -104,6 +121,9 @@ int AliHLTTPCTrackGeometry::CalculateTrackPoints(const AliHLTExternalTrackParam&
 int AliHLTTPCTrackGeometry::CalculateTrackPoints(AliHLTGlobalBarrelTrack& track)
 {
   /// calculate the track points, expects the global magnetic field to be initialized
+  /// depending on the x coordinate of the first track point the corresponding padrow
+  /// is searched and the points are calculated outwards. Eventually the points are
+  /// calculated inwards as a second step.
   int iResult=0;
   int firstpadrow=0;
   for (;
@@ -111,8 +131,10 @@ int AliHLTTPCTrackGeometry::CalculateTrackPoints(AliHLTGlobalBarrelTrack& track)
         AliHLTTPCTransform::Row2X(firstpadrow)+AliHLTTPCTransform::GetPadLength(firstpadrow)<track.GetX();
        firstpadrow++);
   if (firstpadrow>=AliHLTTPCTransform::GetNRows()) return 0;
+  // first calculated outwards
   iResult=CalculateTrackPoints(track, firstpadrow, 1);
   if (iResult>=0 && firstpadrow>0)
+    // now calculate inwards
     iResult=CalculateTrackPoints(track, firstpadrow-1, -1);
   return iResult;
 }
@@ -143,15 +165,51 @@ int AliHLTTPCTrackGeometry::CalculateTrackPoints(AliHLTGlobalBarrelTrack& track,
     if (result<1) continue;
     float planealpha=track.GetAlpha()-offsetAlpha;
     if (planealpha<0) planealpha+=TMath::TwoPi();
+    if (planealpha>TMath::TwoPi()) planealpha-=TMath::TwoPi();
     int slice=int(9*planealpha/TMath::Pi());
-    //if (z<0) slice+=18;
+    if (z<0) slice+=18;
+    if (slice>=36) {
+      HLTError("invalid slice %d calculated from alpha %f", slice, track.GetAlpha());
+    }
     int partition=AliHLTTPCTransform::GetPatch(padrow);
     int row=padrow-AliHLTTPCTransform::GetFirstRow(partition);
     UInt_t id=AliHLTTPCSpacePointData::GetID(slice, partition, row);
     if (TMath::Abs(planealpha-GetPlaneAlpha(id))>0.0001) {
-      HLTError("alpha missmatch for plane %08x (slice %d): alpha from id %f (%.0f), expected %f (%.0f)", id, slice, GetPlaneAlpha(id), 180*GetPlaneAlpha(id)/TMath::Pi(), planealpha, 180*planealpha/TMath::Pi());
+      HLTError("alpha missmatch for plane %08x (slice %d): alpha from id %f (%.0f deg), expected %f (%.0f deg)", id, slice, GetPlaneAlpha(id), 180*GetPlaneAlpha(id)/TMath::Pi(), planealpha, 180*planealpha/TMath::Pi());
+    }
+    if (AddTrackPoint(AliHLTTrackPoint(id, y, z), AliHLTTPCSpacePointData::GetID(slice, partition, 0))>=0) {
+      Float_t rpt[3]={0.,y,z}; // row pad time
+      AliHLTTPCTransform::LocHLT2Raw(rpt, slice, padrow);
+      float m=fDriftTimeFactorA;
+      float n=fDriftTimeOffsetA;
+      if (slice>=18) {
+       m=fDriftTimeFactorC;
+       n=fDriftTimeOffsetC;
+      }
+      if (TMath::Abs(m)>0.) {
+       rpt[2]=(z-n)/m;
+       if (step>0) {
+         // ascending padrows added at end
+         fRawTrackPoints.push_back(AliHLTTrackPoint(id, rpt[1], rpt[2]));
+       } else {
+         // descending padrows added at begin
+         fRawTrackPoints.insert(fRawTrackPoints.begin(), AliHLTTrackPoint(id, rpt[1], rpt[2]));
+       }
+       // FIXME: implement a Print function for the raw track points
+       // stringstream sout;
+       // sout << "  slice "  << setfill(' ') << setw(3) << fixed << right << slice
+       //      << "  row "    << setfill(' ') << setw(3) << fixed << right << padrow
+       //      << "  id 0x"     << hex << setw(8) << id << dec
+       //      << "  y "      << setfill(' ') << setw(5) << fixed << right << setprecision (2) << y
+       //      << "  z "      << setfill(' ') << setw(5) << fixed << right << setprecision (2) << z
+       //      << "  pad "    << setfill(' ') << setw(5) << fixed << right << setprecision (2) << rpt[1]
+       //      << "  time "   << setfill(' ') << setw(5) << fixed << right << setprecision (2) << rpt[2]
+       //      << endl;
+       // cout << sout.str();
+      } else {
+       ALIHLTERRORGUARD(1, "drift time correction not initialized, can not add track points in raw coordinates");
+      }
     }
-    AddTrackPoint(AliHLTTrackPoint(id, y, z), AliHLTTPCSpacePointData::GetID(slice, partition, 0));
   }
   return 0;
 }
@@ -225,6 +283,39 @@ int AliHLTTPCTrackGeometry::FindMatchingTrackPoint(AliHLTUInt32_t spacepointId,
   return -ENOENT;
 }
 
+
+int AliHLTTPCTrackGeometry::RegisterTrackPoints(AliHLTTrackGrid* pGrid) const
+{
+  /// register track points in the index grid, at this step the number
+  /// of tracks in each cell is counted
+  if (!pGrid) return -EINVAL;
+  int iResult=0;
+  for (vector<AliHLTTrackPoint>::const_iterator tp=TrackPoints().begin();
+       tp!=TrackPoints().end() && iResult>=0; tp++) {
+    AliHLTUInt32_t id=tp->GetId();
+    iResult=pGrid->CountSpacePoint(AliHLTTPCSpacePointData::GetSlice(id),
+                                  AliHLTTPCSpacePointData::GetPatch(id),
+                                  AliHLTTPCSpacePointData::GetNumber(id));
+  }
+  return iResult;
+}
+
+int AliHLTTPCTrackGeometry::FillTrackPoints(AliHLTTrackGrid* pGrid) const
+{
+  /// fill track points to index grid
+  if (!pGrid) return -EINVAL;
+  int iResult=0;
+  for (vector<AliHLTTrackPoint>::const_iterator tp=TrackPoints().begin();
+       tp!=TrackPoints().end() && iResult>=0; tp++) {
+    AliHLTUInt32_t id=tp->GetId();
+    iResult=pGrid->AddSpacePoint(GetTrackId(),
+                                AliHLTTPCSpacePointData::GetSlice(id),
+                                AliHLTTPCSpacePointData::GetPatch(id),
+                                AliHLTTPCSpacePointData::GetNumber(id));
+  }
+  return iResult;
+}
+
 AliHLTSpacePointContainer* AliHLTTPCTrackGeometry::ConvertToSpacePoints(bool bAssociated) const
 {
   /// create a collection of all points
@@ -279,9 +370,332 @@ AliHLTSpacePointContainer* AliHLTTPCTrackGeometry::ConvertToSpacePoints(bool bAs
     bd.fPtr=pBuffer;
     bd.fSize=sizeof(AliHLTTPCClusterData)+pClusterData->fSpacePointCnt*sizeof(AliHLTTPCSpacePointData);
     AliHLTComponent::SetDataType(bd.fDataType, "CLUSTERS", "TPC ");
-    bd.fSpecification=//AliHLTTPCDefinitions::EncodeDataSpecification(currentSlice, currentSlice, currentPartition, currentPartition);
+    bd.fSpecification=kAliHLTVoidDataSpec;//AliHLTTPCDefinitions::EncodeDataSpecification(currentSlice, currentSlice, currentPartition, currentPartition);
     spacepoints->AddInputBlock(&bd);
   }
 
   return spacepoints.release();
 }
+
+const AliHLTTrackGeometry::AliHLTTrackPoint* AliHLTTPCTrackGeometry::GetRawTrackPoint(AliHLTUInt32_t id) const
+{
+  /// get raw track point of id
+  const AliHLTTrackGeometry::AliHLTTrackPoint* p=find(&fRawTrackPoints[0], &fRawTrackPoints[fRawTrackPoints.size()], id);
+  if (p==&fRawTrackPoints[fRawTrackPoints.size()]) return 0;
+  return p;
+}
+
+AliHLTTrackGeometry::AliHLTTrackPoint* AliHLTTPCTrackGeometry::GetRawTrackPoint(AliHLTUInt32_t id)
+{
+  /// get raw track point of id
+  AliHLTTrackGeometry::AliHLTTrackPoint* p=find(&fRawTrackPoints[0], &fRawTrackPoints[fRawTrackPoints.size()], id);
+  if (p==&fRawTrackPoints[fRawTrackPoints.size()]) return 0;
+  return p;
+}
+
+int AliHLTTPCTrackGeometry::FillRawResidual(int coordinate, TH2* histo, AliHLTSpacePointContainer* points) const
+{
+  // fill residual histogram
+  if (!histo || !points) return -EINVAL;
+  const vector<AliHLTTrackPoint>& trackPoints=TrackPoints();
+  for (vector<AliHLTTrackPoint>::const_iterator trackpoint=trackPoints.begin();
+       trackpoint!=trackPoints.end(); trackpoint++) {
+    if (!trackpoint->HaveAssociatedSpacePoint()) continue;
+    for (vector<AliHLTTrackSpacepoint>::const_iterator sp=(trackpoint->GetSpacepoints()).begin();
+        sp!=(trackpoint->GetSpacepoints()).end(); sp++) {
+    AliHLTUInt32_t spacepointId=sp->fId;
+    vector<AliHLTTrackPoint>::const_iterator rawpoint=find(fRawTrackPoints.begin(), fRawTrackPoints.end(), trackpoint->GetId());
+    if (rawpoint==fRawTrackPoints.end()) {
+      HLTError("can not find track raw coordinates of track point 0x%08x", trackpoint->GetId());
+      continue;
+    }
+    if (!points->Check(spacepointId)) {
+      //HLTError("can not find associated space point 0x%08x of track point 0x%08x", spacepointId, trackpoint->GetId());
+      continue;
+    }
+    float value=0.;
+    if (coordinate==0) {
+      value=rawpoint->GetU()-points->GetY(spacepointId);
+      histo->Fill(GetPlaneR(trackpoint->GetId()), value);
+    } else {
+      value=rawpoint->GetV()-points->GetZ(spacepointId);
+      //histo->Fill(GetPlaneR(trackpoint->GetId()), value);
+      histo->Fill(rawpoint->GetV(), value);
+    }
+    }
+  }
+  return 0;
+}
+
+int AliHLTTPCTrackGeometry::Write(const AliHLTGlobalBarrelTrack& track,
+                                 AliHLTSpacePointContainer* pSpacePoints,
+                                 AliHLTDataDeflater* pDeflater,
+                                 AliHLTUInt8_t* outputPtr,
+                                 AliHLTUInt32_t size,
+                                 vector<AliHLTUInt32_t>* writtenClusterIds,
+                                 const char* option) const
+{
+  // write track block to buffer
+  if (size<=sizeof(AliHLTTPCTrackBlock)) return -ENOSPC;
+  AliHLTTPCTrackBlock* pTrackBlock=reinterpret_cast<AliHLTTPCTrackBlock*>(outputPtr);
+  pTrackBlock->fSize=sizeof(AliHLTTPCTrackBlock); // size of cluster block added later
+  float alpha=track.GetAlpha();
+  while (alpha<0.) alpha+=TMath::TwoPi();
+  while (alpha>TMath::TwoPi()) alpha-=TMath::TwoPi();
+  pTrackBlock->fSlice=AliHLTUInt8_t(9*alpha/TMath::Pi());
+  if (pTrackBlock->fSlice>=36) {
+    HLTError("invalid slice %d calculated from alpha %f", pTrackBlock->fSlice, track.GetAlpha());
+  }
+  pTrackBlock->fReserved=0;
+  pTrackBlock->fX      = track.GetX();
+  pTrackBlock->fY      = track.GetY();
+  pTrackBlock->fZ      = track.GetZ();
+  pTrackBlock->fSinPsi = track.GetSnp();
+  pTrackBlock->fTgl    = track.GetTgl();
+  pTrackBlock->fq1Pt   = track.GetSigned1Pt();
+
+  pDeflater->Clear();
+  pDeflater->InitBitDataOutput(reinterpret_cast<AliHLTUInt8_t*>(outputPtr+sizeof(AliHLTTPCTrackBlock)), size-sizeof(AliHLTTPCTrackBlock));
+  int result=WriteAssociatedClusters(pSpacePoints, pDeflater, writtenClusterIds, option);
+  if (result<0) return result;
+  pTrackBlock->fSize+=result;
+  return pTrackBlock->fSize;
+}
+
+int AliHLTTPCTrackGeometry::WriteAssociatedClusters(AliHLTSpacePointContainer* pSpacePoints,
+                                                   AliHLTDataDeflater* pDeflater,
+                                                   vector<AliHLTUInt32_t>* writtenClusterIds,
+                                                   const char* /*option*/) const
+{
+  // write associated clusters to buffer via deflater
+  if (!pDeflater || !pSpacePoints) return -EINVAL;
+  AliHLTTPCHWCFSpacePointContainer* pTPCRawSpacePoints=dynamic_cast<AliHLTTPCHWCFSpacePointContainer*>(pSpacePoints);
+  if (!pTPCRawSpacePoints) return -EINVAL;
+  bool bReverse=true;
+  bool bWriteSuccess=true;
+  int writtenClusters=0;
+  // filling of track points starts from first point on track outwards, and
+  // then from that point inwards. That's why the lower padrows might be in
+  // reverse order at the end of the track point array. If the last element
+  // is bigger than the first element, only trackpoints in ascending order
+  // are in the array
+  vector<AliHLTTrackPoint>::const_iterator clrow=fRawTrackPoints.end();
+  if (clrow!=fRawTrackPoints.begin()) {
+    clrow--;
+    AliHLTUInt32_t partition=AliHLTTPCSpacePointData::GetPatch(clrow->GetId());
+    AliHLTUInt32_t partitionrow=AliHLTTPCSpacePointData::GetNumber(clrow->GetId());
+    partitionrow+=AliHLTTPCTransform::GetFirstRow(partition);
+    AliHLTUInt32_t firstpartition=AliHLTTPCSpacePointData::GetPatch(fRawTrackPoints.begin()->GetId());
+    AliHLTUInt32_t firstpartitionrow=AliHLTTPCSpacePointData::GetNumber(fRawTrackPoints.begin()->GetId());
+    firstpartitionrow+=AliHLTTPCTransform::GetFirstRow(firstpartition);
+    if (partitionrow>=firstpartitionrow) {
+      bReverse=false;
+      clrow=fRawTrackPoints.begin();
+    }
+  }
+  const AliHLTUInt32_t clusterCountBitLength=AliHLTTPCDefinitions::fgkClusterParameterDefinitions[AliHLTTPCDefinitions::kClusterCount].fBitLength;
+  unsigned long dataPosition=pDeflater->GetCurrentByteOutputPosition();
+  for (unsigned row=0; row<159 && bWriteSuccess; row++) {
+    if (clrow!=fRawTrackPoints.end()) {
+      AliHLTUInt32_t thisPartition=AliHLTTPCSpacePointData::GetPatch(clrow->GetId());
+      AliHLTUInt32_t thisTrackRow=AliHLTTPCSpacePointData::GetNumber(clrow->GetId());
+      thisTrackRow+=AliHLTTPCTransform::GetFirstRow(thisPartition);
+      if (thisTrackRow==row) {
+       // write clusters
+       const vector<AliHLTTrackSpacepoint>&  clusters=clrow->GetSpacepoints();
+       AliHLTUInt32_t haveClusters=clusters.size()>0;
+       // 1 bit for clusters on that padrow
+       bWriteSuccess=bWriteSuccess && pDeflater->OutputBit(haveClusters);
+       if (haveClusters) {
+         bWriteSuccess=bWriteSuccess && pDeflater->OutputBits(clusters.size(), clusterCountBitLength);
+         for (vector<AliHLTTrackSpacepoint>::const_iterator clid=clusters.begin();
+              clid!=clusters.end() && bWriteSuccess; clid++) {
+           if (!pSpacePoints->Check(clid->fId)) {
+             HLTError("can not find spacepoint 0x%08x", clid->fId);
+             continue;
+           }
+           if (writtenClusterIds) {
+             writtenClusterIds->push_back(clid->fId);
+           }
+
+           // FIXME: there is a bug in the calculation of the residuals stored with the
+           // assiciated space point, calculate again, but needs to be fixed
+           float deltapad =pSpacePoints->GetY(clid->fId)-clrow->GetU();//clid->fdU;
+           float deltatime =pSpacePoints->GetZ(clid->fId)-clrow->GetV();//clid->fdV;
+           if (TMath::Abs(deltapad)>=AliHLTTPCDefinitions::fgkMaxClusterDeltaPad ||
+               TMath::Abs(deltatime)>=AliHLTTPCDefinitions::fgkMaxClusterDeltaTime) {
+             AliHLTUInt8_t slice = AliHLTTPCSpacePointData::GetSlice(clid->fId);
+             AliHLTUInt8_t partition = AliHLTTPCSpacePointData::GetPatch(clid->fId);
+             HLTFatal("cluster 0x%08x slice %d partition %d: residual out of range - pad %f (max %d), time %f (max %d)", clid->fId, slice, partition, deltapad, AliHLTTPCDefinitions::fgkMaxClusterDeltaPad, deltatime, AliHLTTPCDefinitions::fgkMaxClusterDeltaTime);
+           }
+           float sigmaY2=pSpacePoints->GetYWidth(clid->fId);
+           float sigmaZ2=pSpacePoints->GetZWidth(clid->fId);
+           AliHLTUInt64_t charge=(AliHLTUInt64_t)pSpacePoints->GetCharge(clid->fId);
+           AliHLTUInt64_t qmax=(AliHLTUInt64_t)pTPCRawSpacePoints->GetQMax(clid->fId);
+           // cout << "  row "    << setfill(' ') << setw(3) << fixed << right << row
+           //   << "  pad "    << setfill(' ') << setw(7) << fixed << right << setprecision (4) << pSpacePoints->GetY(clid->fId)
+           //   << "  dpad "   << setfill(' ') << setw(7) << fixed << right << setprecision (4) << deltapad
+           //   << "  time "   << setfill(' ') << setw(7) << fixed << right << setprecision (4) << pSpacePoints->GetZ(clid->fId)
+           //   << "  dtime "  << setfill(' ') << setw(7) << fixed << right << setprecision (4) << deltatime
+           //   << "  charge " << setfill(' ') << setw(5) << fixed << right << charge
+           //   << "  qmax "   << setfill(' ') << setw(4) << fixed << right << qmax
+           //   << endl;
+
+           // time and pad coordinates are scaled and transformed to integer values for
+           // both cluster and track point before calculating the residual. this makes
+           // the compression lossless with respect to the format without track model
+           // compression
+           AliHLTUInt64_t deltapad64=0;
+           AliHLTUInt32_t signDeltaPad=0;
+           if (!isnan(deltapad)) {
+             double clusterpad=pSpacePoints->GetY(clid->fId);
+             double trackpad=clrow->GetU();
+             if (clusterpad<0.) {
+               HLTError("cluster 0x%08x has negative pad position", clid->fId, clusterpad);
+             }
+             clusterpad*=AliHLTTPCDefinitions::fgkClusterParameterDefinitions[AliHLTTPCDefinitions::kResidualPad].fScale;
+             trackpad*=AliHLTTPCDefinitions::fgkClusterParameterDefinitions[AliHLTTPCDefinitions::kResidualPad].fScale;
+             AliHLTUInt64_t clusterpad64=(AliHLTUInt64_t)round(clusterpad);
+             AliHLTUInt64_t trackpad64=0;
+             if (trackpad>0.) trackpad64=(AliHLTUInt64_t)round(trackpad);
+             if (clusterpad64<trackpad64) {
+               deltapad64=trackpad64-clusterpad64;
+               signDeltaPad=1;
+             } else {
+               deltapad64=clusterpad64-trackpad64;
+               signDeltaPad=0;
+             }
+           }
+           AliHLTUInt64_t deltatime64=0;
+           AliHLTUInt32_t signDeltaTime=0;
+           if (!isnan(deltatime)) {
+             double clustertime=pSpacePoints->GetZ(clid->fId);
+             double tracktime=clrow->GetV();
+             if (clustertime<0.) {
+               HLTError("cluster 0x%08x has negative time position", clid->fId, clustertime);
+             }
+             clustertime*=AliHLTTPCDefinitions::fgkClusterParameterDefinitions[AliHLTTPCDefinitions::kResidualTime].fScale;
+             tracktime*=AliHLTTPCDefinitions::fgkClusterParameterDefinitions[AliHLTTPCDefinitions::kResidualTime].fScale;
+             AliHLTUInt64_t clustertime64=(AliHLTUInt64_t)round(clustertime);
+             AliHLTUInt64_t tracktime64=0;
+             if (tracktime>0.) tracktime64=(AliHLTUInt64_t)round(tracktime);
+             if (clustertime64<tracktime64) {
+               deltatime64=tracktime64-clustertime64;
+               signDeltaTime=1;
+             } else {
+               deltatime64=clustertime64-tracktime64;
+               signDeltaTime=0;
+             }
+           }
+           AliHLTUInt64_t sigmaY264=0;
+           if (!isnan(sigmaY2)) sigmaY264=(AliHLTUInt64_t)round(sigmaY2*AliHLTTPCDefinitions::fgkClusterParameterDefinitions[AliHLTTPCDefinitions::kSigmaY2].fScale);
+           AliHLTUInt64_t sigmaZ264=0;
+           if (!isnan(sigmaZ2)) sigmaZ264=(AliHLTUInt64_t)round(sigmaZ2*AliHLTTPCDefinitions::fgkClusterParameterDefinitions[AliHLTTPCDefinitions::kSigmaZ2].fScale);
+           bWriteSuccess=bWriteSuccess && pDeflater->OutputParameterBits(AliHLTTPCDefinitions::kResidualPad    , deltapad64);  
+           bWriteSuccess=bWriteSuccess && pDeflater->OutputBit(signDeltaPad);
+           bWriteSuccess=bWriteSuccess && pDeflater->OutputParameterBits(AliHLTTPCDefinitions::kResidualTime   , deltatime64);
+           bWriteSuccess=bWriteSuccess && pDeflater->OutputBit(signDeltaTime);
+           bWriteSuccess=bWriteSuccess && pDeflater->OutputParameterBits(AliHLTTPCDefinitions::kSigmaY2        , sigmaY264);
+           bWriteSuccess=bWriteSuccess && pDeflater->OutputParameterBits(AliHLTTPCDefinitions::kSigmaZ2        , sigmaZ264);
+           bWriteSuccess=bWriteSuccess && pDeflater->OutputParameterBits(AliHLTTPCDefinitions::kCharge         , charge);
+           bWriteSuccess=bWriteSuccess && pDeflater->OutputParameterBits(AliHLTTPCDefinitions::kQMax           , qmax);
+           if (bWriteSuccess) writtenClusters++;
+         }
+       }
+
+       // set to next trackpoint
+       if (bReverse) {
+         if (clrow!=fRawTrackPoints.begin()) {
+           AliHLTUInt32_t nextPartition=AliHLTTPCSpacePointData::GetPatch((clrow-1)->GetId());
+           AliHLTUInt32_t nextTrackRow=AliHLTTPCSpacePointData::GetNumber((clrow-1)->GetId());
+           nextTrackRow+=AliHLTTPCTransform::GetFirstRow(nextPartition);
+           if (thisTrackRow+1==nextTrackRow) {
+             clrow--;
+           } else {
+             // switch direction start from beginning
+             clrow=fRawTrackPoints.begin();
+             bReverse=false;
+           }
+         } else {
+           // all trackpoints processed
+           clrow=fRawTrackPoints.end();
+         }
+       } else {
+         clrow++;
+       }
+       continue;
+      } else {
+       // sequence not ordered, search
+       // this has been fixed and the search is no longer necessary
+       // for (clrow=fRawTrackPoints.begin(); clrow!=fRawTrackPoints.end(); clrow++) {
+       //   if ((AliHLTTPCSpacePointData::GetNumber(clrow->GetId())+AliHLTTPCTransform::GetFirstRow(AliHLTTPCSpacePointData::GetPatch(clrow->GetId())))==row) break;
+       // }
+       // if (clrow==fRawTrackPoints.end()) {
+       //   clrow=fRawTrackPoints.begin();
+       //   HLTWarning("no trackpoint on row %d, current point %d", row, thisTrackRow);
+       // }
+      }
+    }
+    // no cluster on that padrow
+    AliHLTUInt32_t haveClusters=0;
+    bWriteSuccess=bWriteSuccess && pDeflater->OutputBit(haveClusters);
+  }
+
+  if (!bWriteSuccess) return -ENOSPC;
+
+  int allClusters=0;
+  for (clrow=fRawTrackPoints.begin(); clrow!=fRawTrackPoints.end(); clrow++) {
+    allClusters+=clrow->GetSpacepoints().size();
+  }
+  if (allClusters!=writtenClusters) {
+    HLTError("track %d mismatch in written clusters: %d but expected %d", GetTrackId(), writtenClusters, allClusters);
+  }
+
+  pDeflater->Pad8Bits();
+  return pDeflater->GetCurrentByteOutputPosition()-dataPosition;
+}
+
+int AliHLTTPCTrackGeometry::Read(const AliHLTUInt8_t* buffer,
+                                AliHLTUInt32_t size,
+                                float bz,
+                                AliHLTUInt32_t& clusterBlockSize,
+                                const char* /*option*/)
+{
+  // read track block from buffer
+  int iResult=0;
+  if (!buffer) return -EINVAL;
+  if (size<sizeof(AliHLTTPCTrackBlock)) {
+    HLTError("buffer does not contain valid data of track model clusters");
+    return -ENODATA;
+  }
+  const AliHLTTPCTrackBlock* pTrackBlock=reinterpret_cast<const AliHLTTPCTrackBlock*>(buffer);
+  if (pTrackBlock->fSize>size) {
+    HLTError("inconsistent track data block of size %d exceeds available buffer of size %d", pTrackBlock->fSize, size);
+    return -ENODATA;
+  }
+  if (pTrackBlock->fSize<sizeof(AliHLTTPCTrackBlock)) {
+    HLTError("inconsistent size of track data block specified in the header: %d", pTrackBlock->fSize);
+    return -ENODATA;
+  }
+  AliHLTExternalTrackParam param;
+  memset(&param, 0, sizeof(param));
+  param.fAlpha   =( pTrackBlock->fSlice + 0.5 ) * TMath::Pi() / 9.0;
+  if (param.fAlpha>TMath::TwoPi()) param.fAlpha-=TMath::TwoPi();
+  param.fX       = pTrackBlock->fX;
+  param.fY       = pTrackBlock->fY;
+  param.fZ       = pTrackBlock->fZ;
+  param.fSinPsi  = pTrackBlock->fSinPsi;
+  param.fTgl     = pTrackBlock->fTgl;
+  param.fq1Pt    = pTrackBlock->fq1Pt;
+  AliHLTGlobalBarrelTrack track(param);
+  if ((iResult=track.CalculateHelixParams(bz))<0) {
+    HLTError("failed to calculate helix params: %d", iResult);
+    return iResult;
+  }
+  if ((iResult=CalculateTrackPoints(track))<0) {
+    HLTError("failed to calculate track points: %d", iResult);
+    return iResult;
+  }
+  clusterBlockSize=pTrackBlock->fSize-sizeof(AliHLTTPCTrackBlock);
+  return sizeof(AliHLTTPCTrackBlock);
+}