TauUnpacker.cc

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#include "FWCore/Framework/interface/MakerMacros.h"

#include "EventFilter/L1TRawToDigi/interface/Unpacker.h"

#include "L1TObjectCollections.h"

namespace l1t {
   namespace stage2 {
      class TauUnpacker : public Unpacker {
         public:
            virtual bool unpack(const Block& block, UnpackerCollections *coll) override;
      };
   }
}

// Implementation

namespace l1t {
namespace stage2 {
   bool
   TauUnpacker::unpack(const Block& block, UnpackerCollections *coll)
   {

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

     int nBX = int(ceil(block.header().getSize() / 8.)); // Since there are 8 Tau objects 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)->getTaus();
     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 Tau cands filling collection
     for (int bx=firstBX; bx<=lastBX; bx++){

       for (unsigned nTau=0; nTau < 8 && nTau < block.header().getSize(); nTau++){

         uint32_t raw_data = block.payload()[i++];

         if (raw_data == 0)
            continue;

         l1t::Tau tau = l1t::Tau();
       
         tau.setHwPt(raw_data & 0x1FF);

     int abs_eta = (raw_data >> 9) & 0x7F;
         if ((raw_data >> 16) & 0x1) {
           tau.setHwEta(-1*abs_eta);
         } else {
           tau.setHwEta(abs_eta);
         }

         tau.setHwPhi((raw_data >> 17) & 0xFF);
         tau.setHwIso((raw_data >> 25) & 0x1); // Assume one bit for now?
         tau.setHwQual((raw_data >> 26) & 0x7); // Assume 3 bits for now? leaves 3 spare bits

         LogDebug("L1T") << "Tau: eta " << tau.hwEta() << " phi " << tau.hwPhi() << " pT " << tau.hwPt() << " iso " << tau.hwIso() << " qual " << tau.hwQual();

         res_->push_back(bx,tau);

       }

     }

     return true;
   }
}
}

DEFINE_L1T_UNPACKER(l1t::stage2::TauUnpacker);