o2 hdr: derive first orbit of old STF files where the stored DataHeader had no informaton

Author: ironMann

src/common/SubTimeFrameFileReader.cxx

@@ -284,9 +284,6 @@ std::unique_ptr<SubTimeFrame> SubTimeFrameFileReader::read(SubTimeFrameFileBuild
         return nullptr;
       }
 
-      // TODO: fix fake first orbit
-      reinterpret_cast<DataHeader*>(lDataHeaderStack.data())->firstTForbit = sStfId * 256;
-
       auto lHdrStackMsg = pFileBuilder.getHeaderMessage(lDataHeaderStack, lStf->id());
       if (!lHdrStackMsg) {
         DDLOGF(fair::Severity::WARNING, "Out of memory: header message, allocation size: {}", lDataHeaderStackSize);
@@ -305,6 +302,18 @@ std::unique_ptr<SubTimeFrame> SubTimeFrameFileReader::read(SubTimeFrameFileBuild
       }
       buffered_read(lDataMsg->GetData(), lDataSize);
 
+      // Try to figure out the first orbit
+      try {
+        const auto lHdr = reinterpret_cast<DataHeader*>(lDataHeaderStack.data());
+
+        if (lHdr && lHdr->firstTForbit == 0 && lHdr->dataDescription == o2::header::gDataDescriptionRawData) {
+          const auto R = RDHReader(lDataMsg);
+          lStf->updateFirstOrbit(R.getOrbit());
+        }
+      } catch (...) {
+        DDLOGF(fair::Severity::ERROR, "Error getting RDHReader instace. Not setting firstOrbit for file data");
+      }
+
       mStfData.emplace_back(
         SubTimeFrame::StfData{
           std::move(lHdrStackMsg),

src/common/SubTimeFrameVisitors.cxx

@@ -49,6 +49,8 @@ void InterleavedHdrDataSerializer::visit(SubTimeFrame& pStf)
     throw std::bad_alloc();
   }
   std::memcpy(lDataHeaderMsg->GetData(), &gStfDistDataHeader, sizeof(DataHeader));
+  reinterpret_cast<DataHeader*>(lDataHeaderMsg->GetData())->firstTForbit = pStf.mFirstOrbit;
+  reinterpret_cast<DataHeader*>(lDataHeaderMsg->GetData())->payloadSerializationMethod = gSerializationMethodNone;
 
   auto lDataMsg = mChan.NewMessage(sizeof(SubTimeFrame::Header));
   if (!lDataMsg) {