AliMUONDigitizerV3.cxx

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/**************************************************************************
* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
*                                                                        *
* Author: The ALICE Off-line Project.                                    *
* Contributors are mentioned in the code where appropriate.              *
*                                                                        *
* Permission to use, copy, modify and distribute this software and its   *
* documentation strictly for non-commercial purposes is hereby granted   *
* without fee, provided that the above copyright notice appears in all   *
* copies and that both the copyright notice and this permission notice   *
* appear in the supporting documentation. The authors make no claims     *
* about the suitability of this software for any purpose. It is          *
* provided "as is" without express or implied warranty.                  *
**************************************************************************/

// $Id$


#include "AliMUONDigitizerV3.h"

#include "AliMUON.h"
#include "AliMUONCalibrationData.h"
#include "AliMUONConstants.h"
#include "AliMUONDigit.h"
#include "AliMUONLogger.h"
#include "AliMUONTriggerElectronics.h"
#include "AliMUONTriggerStoreV1.h"
#include "AliMUONVCalibParam.h"
#include "AliMUONVDigitStore.h"
#include "AliMUONGeometryTransformer.h" //ADDED for trigger noise
#include "AliMUONRecoParam.h"
#include "AliMUONTriggerChamberEfficiency.h"
#include "AliMUONTriggerUtilities.h"

#include "AliMpCDB.h"
#include "AliMpSegmentation.h"
#include "AliMpCathodType.h"
#include "AliMpConstants.h"
#include "AliMpDEIterator.h"
#include "AliMpDEManager.h"
#include "AliMpPad.h"
#include "AliMpStationType.h"
#include "AliMpVSegmentation.h"
#include "AliMpDDLStore.h"

#include "AliCDBManager.h"
#include "AliCodeTimer.h"
#include "AliLog.h"
#include "AliRun.h"
#include "AliDigitizationInput.h"
#include "AliLoader.h"
#include "AliRunLoader.h"

#include <Riostream.h>
#include <TF1.h>
#include <TFile.h>
#include <TMath.h>
#include <TRandom.h>
#include <TString.h>
#include <TSystem.h>
#include <TTree.h>

//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------

namespace
{
  AliMUON* muon()
  {
    return static_cast<AliMUON*>(gAlice->GetModule("MUON"));
  }

  //ADDED for trigger noise
  const AliMUONGeometryTransformer* GetTransformer()
  {
      return muon()->GetGeometryTransformer();
  }
}

Double_t AliMUONDigitizerV3::fgNSigmas = 4.0;

ClassImp(AliMUONDigitizerV3)

//_____________________________________________________________________________
AliMUONDigitizerV3::AliMUONDigitizerV3(AliDigitizationInput* digInput, 
                                       Int_t generateNoisyDigits)
: AliDigitizer(digInput),
fIsInitialized(kFALSE),
fCalibrationData(0x0),
fTriggerProcessor(0x0),
fNoiseFunctionTrig(0x0),
fGenerateNoisyDigits(generateNoisyDigits),
fLogger(new AliMUONLogger(4207)), /* 4207 = 25% of the 16828 MCH manus */
fTriggerStore(new AliMUONTriggerStoreV1),
fDigitStore(0x0),
fOutputDigitStore(0x0),
fInputDigitStores(0x0),
fRecoParam(0x0),
fTriggerEfficiency(0x0),
fTriggerUtilities(0x0),
fEfficiencyResponse(2*AliMUONConstants::NTriggerCh()*AliMUONConstants::NTriggerCircuit())
{

  AliDebug(1,Form("AliDigitizationInput=%p",fDigInput));

}

//_____________________________________________________________________________
AliMUONDigitizerV3::~AliMUONDigitizerV3()
{

  AliDebug(1,"dtor");

 // delete fCalibrationData;
  delete fTriggerProcessor;
  delete fNoiseFunctionTrig;
  delete fTriggerStore;
  delete fDigitStore;
  delete fOutputDigitStore;
  delete fInputDigitStores;
  delete fTriggerUtilities;
  
  AliInfo("Summary of messages");
  fLogger->Print();
  
  delete fLogger;
}

//_____________________________________________________________________________
void 
AliMUONDigitizerV3::ApplyResponseToTrackerDigit(AliMUONVDigit& digit, Bool_t addNoise)
{

  Float_t charge = digit.Charge();
  
  if (!digit.IsChargeInFC())
  {
    charge *= AliMUONConstants::DefaultADC2MV()*AliMUONConstants::DefaultA0()*AliMUONConstants::DefaultCapa();
    fLogger->Log("CHECK ME ! WAS NOT SUPPOSED TO BE HERE !!! ARE YOU RECONSTRUCTING OLD SIMULATIONS ? ");
    AliError("CHECK ME ! WAS NOT SUPPOSED TO BE HERE !!! ARE YOU RECONSTRUCTING OLD SIMULATIONS ? ");
  }
  
  // We set the charge to 0, as the only relevant piece of information
  // after Digitization is the ADC value.  
  digit.SetCharge(0);
    
  Int_t detElemId = digit.DetElemId();
  Int_t manuId = digit.ManuId();
  
  AliMUONVCalibParam* pedestal = fCalibrationData->Pedestals(detElemId,manuId);
  if (!pedestal)
  {
    fLogger->Log(Form("%s:%d:Could not get pedestal for DE=%4d manuId=%4d. Disabling.",
                      __FILE__,__LINE__,
                      detElemId,manuId));
    digit.SetADC(0);
    return;    
  }
  
  Int_t manuChannel = digit.ManuChannel();
  
  if ( pedestal->ValueAsFloat(manuChannel,0) == AliMUONVCalibParam::InvalidFloatValue() ||
      pedestal->ValueAsFloat(manuChannel,1) == AliMUONVCalibParam::InvalidFloatValue() )
  {
    // protection against invalid pedestal value
    digit.SetADC(0);
    return;
  }

  Int_t adc = DecalibrateTrackerDigit(*pedestal,manuChannel,charge,addNoise,
                                      digit.IsNoiseOnly());
  
  digit.SetADC(adc);
}


//_____________________________________________________________________________
void 
AliMUONDigitizerV3::ApplyResponseToTriggerDigit(AliMUONVDigit& digit)
{
    
  Int_t detElemId = digit.DetElemId();
  Int_t localCircuit = digit.ManuId();
  Int_t strip = digit.ManuChannel();
  Int_t cathode = digit.Cathode();
  Int_t trigCh = detElemId/100 - 11;
  
  // Masked channels
  Bool_t isMasked = fTriggerUtilities->IsMasked(digit);
  AliDebug(1,Form("detElemId %i  cath %i  board %i  strip %i  is masked %i\n", detElemId, cathode, localCircuit, strip, isMasked));
  if ( isMasked ) {
    digit.SetCharge(0);
    digit.SetADC(0);
    //AliDebug(1,Form("ch %i  cath %i  board %i  strip %i  masked\n", trigCh, cathode, localCircuit, strip));
    return;
  }
  
  
  Int_t arrayIndex = GetArrayIndex(cathode, trigCh, localCircuit);
  
  // Trigger chamber efficiency
  if ( fTriggerEfficiency ) {
    if ( fEfficiencyResponse[arrayIndex] < 0 ) {
      Bool_t isTrig[2] = {kTRUE, kTRUE};
      fTriggerEfficiency->IsTriggered(detElemId, localCircuit, isTrig[0], isTrig[1]);
      Int_t arrayIndexBend = GetArrayIndex(0, trigCh, localCircuit);
      Int_t arrayIndexNonBend = GetArrayIndex(1, trigCh, localCircuit);
      fEfficiencyResponse[arrayIndexBend] = isTrig[0];
      fEfficiencyResponse[arrayIndexNonBend] = isTrig[1];
    }
    AliDebug(1,Form("detElemId %i  cath %i  board %i  strip %i  efficiency %i\n", detElemId, cathode, localCircuit, strip, fEfficiencyResponse[arrayIndex]));
    if ( fEfficiencyResponse[arrayIndex] == 0 ) {
      digit.SetCharge(0);
      digit.SetADC(0);
      //AliDebug(1,Form("ch %i  cath %i  board %i  strip %i  NOT efficient\n", trigCh, cathode, localCircuit, strip));
      return;
    }
  }  
}



//_____________________________________________________________________________
void
AliMUONDigitizerV3::ApplyResponse(const AliMUONVDigitStore& store,
                                  AliMUONVDigitStore& filteredStore)
{

  filteredStore.Clear();
  
  const Bool_t kAddNoise = kTRUE;
  
  TIter next(store.CreateIterator());
  AliMUONVDigit* digit;
  
  if ( fTriggerEfficiency ) fEfficiencyResponse.Reset(-1);
  
  while ( ( digit = static_cast<AliMUONVDigit*>(next()) ) )
  {
    AliMp::StationType stationType = AliMpDEManager::GetStationType(digit->DetElemId());
    
    if ( stationType != AliMp::kStationTrigger )
    {
      Bool_t addNoise = kAddNoise;
      if (digit->IsConverted()) addNoise = kFALSE; // No need to add extra noise to a converted real digit
      ApplyResponseToTrackerDigit(*digit,addNoise);
    }
    else {
      ApplyResponseToTriggerDigit(*digit);
    }

    if ( digit->ADC() > 0  || digit->Charge() > 0 )
    {
      filteredStore.Add(*digit,AliMUONVDigitStore::kIgnore);
    }
  }
}    

//_____________________________________________________________________________
Int_t 
AliMUONDigitizerV3::DecalibrateTrackerDigit(const AliMUONVCalibParam& pedestals,
                                            Int_t channel,
                                            Float_t charge,
                                            Bool_t addNoise,
                                            Bool_t noiseOnly)
{
  
  static const Int_t kMaxADC = (1<<12)-1; // We code the charge on a 12 bits ADC.
  
  Int_t thres(4095);
  Int_t qual(0xF);
  Float_t capa(AliMUONConstants::DefaultCapa()); // capa = 0.2 and a0 = 1.25
  Float_t a0(AliMUONConstants::DefaultA0());  // is equivalent to gain = 4 mV/fC
  Float_t adc2mv(AliMUONConstants::DefaultADC2MV()); // 1 ADC channel = 0.61 mV
               
  Float_t pedestalMean = pedestals.ValueAsFloat(channel,0);
  Float_t pedestalSigma = pedestals.ValueAsFloat(channel,1);
  
  AliDebugClass(2,Form("DE %04d MANU %04d CH %02d PEDMEAN %7.2f PEDSIGMA %7.2f",
           pedestals.ID0(),pedestals.ID1(),channel,pedestalMean,pedestalSigma));
  
  if ( qual <= 0 ) return 0;
  
  Float_t chargeThres = a0*thres;
  
  Float_t padc = charge/a0; // (adc - ped) value
  
  padc /= capa*adc2mv;
  
  Int_t adc(0);
  
  Float_t adcNoise = 0.0;
    
  if ( addNoise ) 
  {
    if ( noiseOnly )
    {      
      adcNoise = NoiseFunction()->GetRandom()*pedestalSigma;
    }
    else
    {
      adcNoise = gRandom->Gaus(0.0,pedestalSigma);
    }
  }
    
  adc = TMath::Nint(padc + pedestalMean + adcNoise + 0.5);
  
  if ( adc < TMath::Nint(pedestalMean + fgNSigmas*pedestalSigma + 0.5) ) 
  {
    // this is an error only in specific cases
    if ( !addNoise || (addNoise && noiseOnly) ) 
    {
      AliDebugClass(1,Form(" DE %04d Manu %04d Channel %02d "
                           " a0 %7.2f thres %04d ped %7.2f pedsig %7.2f adcNoise %7.2f "
                           " charge=%7.2f padc=%7.2f adc=%04d ZS=%04d fgNSigmas=%e addNoise %d noiseOnly %d ",
                           pedestals.ID0(),pedestals.ID1(),channel, 
                           a0, thres, pedestalMean, pedestalSigma, adcNoise,
                           charge, padc, adc, 
                           TMath::Nint(pedestalMean + fgNSigmas*pedestalSigma + 0.5),
                           fgNSigmas,addNoise,noiseOnly));
    }
    
    adc = 0;
  }
  
  // be sure we stick to 12 bits.
  if ( adc > kMaxADC )
  {
    adc = kMaxADC;
  }
  
  return adc;
}

//_____________________________________________________________________________
void
AliMUONDigitizerV3::CreateInputDigitStores()
{
  
  if (fInputDigitStores)
  {
    AliFatal("Should be called only once !");
  }
  
  fInputDigitStores = new TObjArray;
  
  fInputDigitStores->SetOwner(kTRUE);
  
  for ( Int_t iFile = 0; iFile < fDigInput->GetNinputs(); ++iFile )
  {    
    AliLoader* inputLoader = GetLoader(fDigInput->GetInputFolderName(iFile));
    
    inputLoader->LoadSDigits("READ");
    
    TTree* iTreeS = inputLoader->TreeS();
    if (!iTreeS)
    {
      AliFatal(Form("Could not get access to input file #%d",iFile));
    }
    
    fInputDigitStores->AddAt(AliMUONVDigitStore::Create(*iTreeS),iFile);
  }
}

//_____________________________________________________________________________
void
AliMUONDigitizerV3::Digitize(Option_t*)
{
    
  AliCodeTimerAuto("",0)
  
  if ( fDigInput->GetNinputs() == 0 )
  {
    AliWarning("No input set. Nothing to do.");
    return;
  }
  
  if ( !fIsInitialized )
  {
    AliError("Not initialized. Cannot perform the work. Sorry");
    return;
  }
  
  Int_t nInputFiles = fDigInput->GetNinputs();
  
  AliLoader* outputLoader = GetLoader(fDigInput->GetOutputFolderName());
  
  outputLoader->MakeDigitsContainer();
  
  TTree* oTreeD = outputLoader->TreeD();
  
  if (!oTreeD) 
  {
    AliFatal("Cannot create output TreeD");
  }

  // Loop over all the input files, and merge the sdigits found in those
  // files.
  
  for ( Int_t iFile = 0; iFile < nInputFiles; ++iFile )
  {  
    AliLoader* inputLoader = GetLoader(fDigInput->GetInputFolderName(iFile));

    inputLoader->LoadSDigits("READ");

    TTree* iTreeS = inputLoader->TreeS();
    if (!iTreeS)
    {
      AliFatal(Form("Could not get access to input file #%d",iFile));
    }

    if (!fInputDigitStores)
    {
      CreateInputDigitStores();      
    }
    
    AliMUONVDigitStore* dstore = static_cast<AliMUONVDigitStore*>(fInputDigitStores->At(iFile));
    
    dstore->Connect(*iTreeS);
    
    iTreeS->GetEvent(0);

    MergeWithSDigits(fDigitStore,*dstore,fDigInput->GetMask(iFile));

    inputLoader->UnloadSDigits();
    
    dstore->Clear();
  }

  
  // At this point, we do have digit arrays (one per chamber) which contains 
  // the merging of all the sdigits of the input file(s).
  // We now massage them to apply the detector response, i.e. this
  // is here that we do the "digitization" work.
  
  if (!fOutputDigitStore)
  {
    fOutputDigitStore = fDigitStore->Create();
  }
  
  if ( fGenerateNoisyDigits>=2 )
  {
    // Generate noise-only digits for trigger.
    GenerateNoisyDigitsForTrigger(*fDigitStore);
  }
  ApplyResponse(*fDigitStore,*fOutputDigitStore);

  if ( fGenerateNoisyDigits )
  {
    // Generate noise-only digits for tracker.
    GenerateNoisyDigits(*fOutputDigitStore);
  }
  
  // We generate the global and local trigger decisions.
  fTriggerProcessor->Digits2Trigger(*fOutputDigitStore,*fTriggerStore);

  // Prepare output tree
  Bool_t okD = fOutputDigitStore->Connect(*oTreeD,kFALSE);
  Bool_t okT = fTriggerStore->Connect(*oTreeD,kFALSE);
  if (!okD || !okT)
  {
    AliError(Form("Could not make branch : Digit %d Trigger %d",okD,okT));
    return;
  }
  
  // Fill the output treeD
  oTreeD->Fill();
  
  // Write to the output tree(D).
  // Please note that as GlobalTrigger, LocalTrigger and Digits are in the same
  // tree (=TreeD) in different branches, this WriteDigits in fact writes all of 
  // the 3 branches.
  outputLoader->WriteDigits("OVERWRITE");  
  
  outputLoader->UnloadDigits();
  
  // Finally, we clean up after ourselves.
  fTriggerStore->Clear();
  fDigitStore->Clear();
  fOutputDigitStore->Clear();
}


//_____________________________________________________________________________
void
AliMUONDigitizerV3::GenerateNoisyDigits(AliMUONVDigitStore& digitStore)
{
  
  AliCodeTimerAuto("",0)
  
  for ( Int_t i = 0; i < AliMUONConstants::NTrackingCh(); ++i )
  {
    AliMpDEIterator it;
  
    it.First(i);
  
    while ( !it.IsDone() )
    {
      for ( Int_t cathode = 0; cathode < 2; ++cathode )
      {
        GenerateNoisyDigitsForOneCathode(digitStore,it.CurrentDEId(),cathode);
      }
      it.Next();
    }
  }
}
 
//_____________________________________________________________________________
void
AliMUONDigitizerV3::GenerateNoisyDigitsForOneCathode(AliMUONVDigitStore& digitStore,
                                                     Int_t detElemId, Int_t cathode)
{
  
  const AliMpVSegmentation* seg 
    = AliMpSegmentation::Instance()->GetMpSegmentation(detElemId,AliMp::GetCathodType(cathode));
  Int_t nofPads = seg->NofPads();
  
  Int_t maxIx = seg->MaxPadIndexX();
  Int_t maxIy = seg->MaxPadIndexY();
  
  static const Double_t kProbToBeOutsideNsigmas = TMath::Erfc(fgNSigmas/TMath::Sqrt(2.0)) / 2. ;
  
  Int_t nofNoisyPads = TMath::Nint(kProbToBeOutsideNsigmas*nofPads);
  if ( !nofNoisyPads ) return;
  
  nofNoisyPads = 
    TMath::Nint(gRandom->Gaus(nofNoisyPads,
                              nofNoisyPads/TMath::Sqrt(nofNoisyPads)));
  
  AliDebug(3,Form("DE %d cath %d nofNoisyPads %d",detElemId,cathode,nofNoisyPads));
  
  for ( Int_t i = 0; i < nofNoisyPads; ++i ) 
  {
    Int_t ix(-1);
    Int_t iy(-1);
    AliMpPad pad;
    
    do {
      ix = gRandom->Integer(maxIx+1);
      iy = gRandom->Integer(maxIy+1);
      pad = seg->PadByIndices(ix,iy,kFALSE);
    } while ( !pad.IsValid() );

    Int_t manuId = pad.GetManuId();
    Int_t manuChannel = pad.GetManuChannel();    

    AliMUONVCalibParam* pedestals = fCalibrationData->Pedestals(detElemId,manuId);
    
    if (!pedestals) 
    {
      // no pedestal available for this channel, simply give up
      continue;
    }
    
    AliMUONVDigit* d = digitStore.CreateDigit(detElemId,manuId,manuChannel,cathode);
    
    d->SetPadXY(ix,iy);
    
    d->SetCharge(0.0); // charge is zero, the ApplyResponseToTrackerDigit will add the noise
    d->NoiseOnly(kTRUE);
    ApplyResponseToTrackerDigit(*d,kTRUE);
    if ( d->ADC() > 0 )
    {
      Bool_t ok = digitStore.Add(*d,AliMUONVDigitStore::kDeny);
      // this can happen (that we randomly chose a digit that is
      // already there). We simply ignore this, but log the occurence
      // to cross-check that it's not too frequent.
      if (!ok)
      {
        fLogger->Log("Collision while adding noiseOnly digit");
      }
      else
      {
        fLogger->Log("Added noiseOnly digit");
      }
    }
    delete d;
  }
}


//_____________________________________________________________________________
void
AliMUONDigitizerV3::GenerateNoisyDigitsForTrigger(AliMUONVDigitStore& digitStore)
{

  if ( !fNoiseFunctionTrig )
  {
    fNoiseFunctionTrig = new TF1("AliMUONDigitizerV3::fNoiseFunctionTrig","landau",
         50.,270.);
    
    fNoiseFunctionTrig->SetParameters(3.91070e+02, 9.85026, 9.35881e-02);
  }

  AliMpPad pad[2];
  AliMUONVDigit *d[2]={0x0};

  for ( Int_t chamberId = AliMUONConstants::NTrackingCh(); chamberId < AliMUONConstants::NCh(); ++chamberId )
  {
  
    Int_t nofNoisyPads = 50;

    Float_t r=-1, fi = 0., gx, gy, x, y, z, xg01, yg01, zg, xg02, yg02;
    AliMpDEIterator it;
  
    AliDebug(3,Form("Chamber %d nofNoisyPads %d",chamberId,nofNoisyPads));

    for ( Int_t i = 0; i < nofNoisyPads; ++i )
    {
      //printf("Generating noise %i\n",i);
  Int_t ix(-1);
  Int_t iy(-1);
  Bool_t isOk = kFALSE;
  Int_t detElemId = -1;
  do {
    //r = gRandom->Landau(9.85026, 9.35881e-02);
      r = fNoiseFunctionTrig->GetRandom();
      fi = 2. * TMath::Pi() * gRandom->Rndm();
      //printf("r = %f\tfi = %f\n", r, fi);
      gx = r * TMath::Cos(fi);
      gy = r * TMath::Sin(fi);

      for ( it.First(chamberId); ! it.IsDone(); it.Next() ){
    Int_t currDetElemId = it.CurrentDEId();
    const AliMpVSegmentation* seg
        = AliMpSegmentation::Instance()->GetMpSegmentation(currDetElemId,AliMp::GetCathodType(0));
    if (!seg) continue;
    Float_t deltax = seg->GetDimensionX();
    Float_t deltay = seg->GetDimensionY();
    GetTransformer()->Local2Global(currDetElemId, -deltax, -deltay, 0, xg01, yg01, zg);
    GetTransformer()->Local2Global(currDetElemId,  deltax,  deltay, 0, xg02, yg02, zg);
    Float_t xg1 = xg01, xg2 = xg02, yg1 = yg01, yg2 = yg02;
    if(xg01>xg02){
        xg1 = xg02;
        xg2 = xg01;
    }
    if(yg01>yg02){
        yg1 = yg02;
        yg2 = yg01;
    }
    if(gx>=xg1 && gx<=xg2 && gy>=yg1 && gy<=yg2){
        detElemId = currDetElemId;
        GetTransformer()->Global2Local(detElemId, gx, gy, 0, x, y, z);
        pad[0] = seg->PadByPosition(x,y,kFALSE);
        if(!pad[0].IsValid()) continue;
        isOk = kTRUE;
        break;
    }
      } // loop on slats
  } while ( !isOk );

  const AliMpVSegmentation* seg1
      = AliMpSegmentation::Instance()->GetMpSegmentation(detElemId,AliMp::GetCathodType(1));
  pad[1] = seg1->PadByPosition(x,y,kFALSE);

  for ( Int_t cathode = 0; cathode < 2; ++cathode ){
    Int_t manuId = pad[cathode].GetLocalBoardId(0);
    Int_t manuChannel = pad[cathode].GetLocalBoardChannel(0);    
    d[cathode] = digitStore.CreateDigit(detElemId,manuId,manuChannel,cathode);
    ix = pad[cathode].GetIx();
    iy = pad[cathode].GetIy();
    d[cathode]->SetPadXY(ix,iy);
    //d[cathode].SetSignal(1);
    //d[cathode].SetPhysicsSignal(0);
    d[cathode]->SetCharge(1);
    d[cathode]->NoiseOnly(kTRUE);
    AliDebug(3,Form("Adding a pure noise digit :"));

    Bool_t ok = digitStore.Add(*d[cathode],AliMUONVDigitStore::kDeny);
    if (!ok)
    {
        fLogger->Log("Collision while adding TriggerNoise digit");
    }
    else
    {
        fLogger->Log("Added triggerNoise digit");
    }
  } //loop on cathodes
    } // loop on noisy pads
  } // loop on chambers
}


//_____________________________________________________________________________
AliLoader*
AliMUONDigitizerV3::GetLoader(const TString& folderName)
{

  AliDebug(2,Form("Getting access to folder %s",folderName.Data()));
  AliLoader* loader = AliRunLoader::GetDetectorLoader("MUON",folderName.Data());
  if (!loader)
  {
    AliError(Form("Could not get MuonLoader from folder %s",folderName.Data()));
    return 0x0;
  }
  return loader;
}

//_____________________________________________________________________________
Bool_t
AliMUONDigitizerV3::Init()
{

  AliDebug(2,"");
  
  if ( fIsInitialized )
  {
    AliError("Object already initialized.");
    return kFALSE;
  }
  
  if (!fDigInput)
  {
    AliError("fDigInput is null !");
    return kFALSE;
  }
  
  // Load mapping
  if ( ! AliMpCDB::LoadDDLStore() ) {
    AliFatal("Could not access mapping from OCDB !");
  }
  
  if (!fCalibrationData)
      AliFatal("Calibration data object not defined");

  if ( !fCalibrationData->Pedestals() )
  {
    AliFatal("Could not access pedestals from OCDB !");
  }
  
  AliInfo("Using trigger configuration from CDB");
  
  fTriggerProcessor = new AliMUONTriggerElectronics(fCalibrationData);
  
  AliDebug(1, Form("Will %s generate noise-only digits for tracker",
                     (fGenerateNoisyDigits ? "":"NOT")));
  
  fTriggerUtilities = new AliMUONTriggerUtilities(fCalibrationData);
  
  if ( muon()->GetTriggerEffCells() ) {
    // Apply trigger efficiency
    AliDebug(1, "Will apply trigger efficiency");
    fTriggerEfficiency = new AliMUONTriggerChamberEfficiency(fCalibrationData->TriggerEfficiency());
  }

  fIsInitialized = kTRUE;
  return kTRUE;
}


//_____________________________________________________________________________
Int_t AliMUONDigitizerV3::GetArrayIndex(Int_t cathode, Int_t trigCh, Int_t localCircuit)
{
  return
    AliMUONConstants::NTriggerCircuit() * AliMUONConstants::NTriggerCh() * cathode +
    AliMUONConstants::NTriggerCircuit() * trigCh + localCircuit-1;
}


//_____________________________________________________________________________
void 
AliMUONDigitizerV3::MergeWithSDigits(AliMUONVDigitStore*& outputStore,
                                     const AliMUONVDigitStore& input,
                                     Int_t mask)
{
  
  if ( !outputStore ) outputStore = input.Create();
  
  TIter next(input.CreateIterator());
  AliMUONVDigit* sdigit;
  
  while ( ( sdigit = static_cast<AliMUONVDigit*>(next()) ) )
  {
    // Update the track references using the mask.
    // FIXME: this is dirty, for backward compatibility only.
    // Should re-design all this way of keeping track of MC information...
    if ( mask ) sdigit->PatchTracks(mask);
    // Then add or update the digit to the output.
    AliMUONVDigit* added = outputStore->Add(*sdigit,AliMUONVDigitStore::kMerge);
    if (!added)
    {
      AliError("Could not add digit in merge mode");
    }
  }
}

//_____________________________________________________________________________
TF1*
AliMUONDigitizerV3::NoiseFunction()
{
  static TF1* f = 0x0;
  if (!f)
  {
    f = new TF1("AliMUONDigitizerV3::NoiseFunction","gaus",fgNSigmas,fgNSigmas*10);
    f->SetParameters(1,0,1);
  }
  return f;
}

//_____________________________________________________________________________
void AliMUONDigitizerV3::SetCalibrationData(AliMUONCalibrationData* calibrationData, 
                                            AliMUONRecoParam* recoParam) 
{
  fCalibrationData = calibrationData;
  fRecoParam = recoParam;
  if (!fRecoParam)
  {
    AliError("Cannot work (e.g. decalibrate) without recoparams !");
  }
}