Add automatic TSLength calculation and tsIndex to TimesliceMetaData

Up to now the TS length was hardcoded for the TimesliceMetaData object.
This commit adds an automatic calculation and inserts it
into the stored TimesliceMetaData objects.

fles/mcbm2018/CbmMcbm2018Source.cxx

@@ -259,9 +259,26 @@ Int_t CbmMcbm2018Source::FillBuffer() {
     }    // if( 0 == tsIndex % fuTsReduction )
 
     /// Save the TimeSlice meta-data for access by higher level tasks
-    /// TODO: do not hard-code the duration here!
+    if (fTSCounter == 1) {
+      auto nMsInTs = ts.num_core_microslices();
+      if (nMsInTs > 1) {
+        // This assumes that we have a component 0 and component independent ms/ts settings!
+        auto msDescA      = ts.descriptor(0, 0);
+        auto msDescB      = ts.descriptor(0, 1);
+        auto msLength     = msDescB.idx - msDescA.idx;
+        fTSLength         = msLength * nMsInTs;
+        fTSOverlappLength = msLength * (ts.num_microslices(0) - nMsInTs);
+      } else {
+        LOG(warning)
+          << "CbmMcbm2018Source::FillBuffer() - TS 1 - Calculate "
+             "TimesliceMetaData information - single microslice timeslices -> "
+             "TS duration can not be calculated with the given method. Hence, "
+             "TimesliceMetaData duration values are filled with 0";
+      }
+    }
     new ((*fTimeSliceMetaDataArray)[fTimeSliceMetaDataArray->GetEntriesFast()])
-      TimesliceMetaData(ts.descriptor(0, 0).idx);
+      TimesliceMetaData(
+        ts.descriptor(0, 0).idx, fTSLength, fTSOverlappLength, tsIndex);
 
     return 0;
   }

fles/mcbm2018/CbmMcbm2018Source.h

@@ -92,6 +92,9 @@ private:
 
   UInt_t fTSNumber;
   UInt_t fTSCounter;
+  ULong64_t fTSLength = 0;  // used for the creation of the TimesliceMetaData
+  ULong64_t fTSOverlappLength =
+    0;  // used for the creation of the TimesliceMetaData
   TStopwatch fTimer;
 
   TH1I* fHistoMissedTS;         //!