l1t::stage2::JetUnpacker Class Reference

Inheritance diagram for l1t::stage2::JetUnpacker:

Public Member Functions
virtual bool	unpack (const Block &block, UnpackerCollections *coll) override

Detailed Description

Definition at line 9 of file JetUnpacker.cc.

Member Function Documentation

bool l1t::stage2::JetUnpacker::unpack ( const Block &  block, UnpackerCollections *  coll  )

overridevirtual

Implements l1t::Unpacker.

Definition at line 21 of file JetUnpacker.cc.

References coll, l1t::BlockHeader::getID(), l1t::BlockHeader::getSize(), l1t::Block::header(), l1t::L1Candidate::hwEta(), l1t::L1Candidate::hwPhi(), l1t::L1Candidate::hwPt(), l1t::L1Candidate::hwQual(), i, configurableAnalysis::Jet, metsig::jet, LogDebug, l1t::Block::payload(), l1t::L1Candidate::setHwEta(), l1t::L1Candidate::setHwPhi(), l1t::L1Candidate::setHwPt(), and l1t::L1Candidate::setHwQual().

   {

     LogDebug("L1T") << "Block ID  = " << block.header().getID() << " size = " << block.header().getSize();

     int nBX = int(ceil(block.header().getSize() / 6.)); // Since there are 12 jets reported per event (see CMS IN-2013/005)

     // Find the first and last BXs
     int firstBX = -(ceil((double)nBX/2.)-1);
     int lastBX;
     if (nBX % 2 == 0) {
       lastBX = ceil((double)nBX/2.);
     } else {
       lastBX = ceil((double)nBX/2.)-1;
     }

     auto res_ = static_cast<L1TObjectCollections*>(coll)->getJets();
     res_->setBXRange(firstBX, lastBX);

     LogDebug("L1T") << "nBX = " << nBX << " first BX = " << firstBX << " lastBX = " << lastBX;

     // Initialise index
     int unsigned i = 0;

     // Loop over multiple BX and then number of jets filling jet collection
     for (int bx=firstBX; bx<=lastBX; bx++){
       for (unsigned nJet=0; nJet < 6 && nJet < block.header().getSize(); nJet++){
         uint32_t raw_data = block.payload()[i++];

         if (raw_data == 0)
            continue;

         l1t::Jet jet = l1t::Jet();

         jet.setHwPt(raw_data & 0x7FF);
         
         int abs_eta = (raw_data >> 11) & 0x7F;
         if ((raw_data >> 18) & 0x1) {
           jet.setHwEta(-1 * (128-abs_eta));
         } else {
           jet.setHwEta(abs_eta);
         }

     jet.setHwPhi((raw_data >> 19) & 0xFF);
         jet.setHwQual((raw_data >> 27) & 0x7); // Assume 3 bits for now? Leaves 2 bits spare

         LogDebug("L1T") << "Jet: eta " << jet.hwEta() << " phi " << jet.hwPhi() << " pT " << jet.hwPt() << " qual " << jet.hwQual() << " bx " << bx;

         res_->push_back(bx,jet);
       }
     }

     return true;
   }