added example macro to extract HLTOUT payload from raw data

diff --git a/HLT/exa/extract-hltout-payload.C b/HLT/exa/extract-hltout-payload.C
new file mode 100644 (file)
index 0000000..86eab7c
--- /dev/null
+++ b/HLT/exa/extract-hltout-payload.C
@@ -0,0 +1,80 @@
+// $Id$
+/**
+ * @file extract-hltout-payload.C
+ * @brief Extraction of SDD data blocks from HLTOUT
+ *
+ * <pre>
+ * Usage: aliroot -b -q extract-hltout-payload.C'("raw.root")' | tee extract-hltout-payload.log
+ * </pre>
+ *
+ * The macro stores all data blocks from the HLTOUT payload into separated
+ * folders for each event. The file names are derived from data type and
+ * specification of the block. Data is read from a raw reader. An input
+ * file can be specified as the first argument, default is "./" and reads
+ * ddl files through AliRawReaderFile.
+ *
+ * A selection criterion can be specified as second argument, the format
+ * of the selection string follows the arguments of the 
+ * AliHLTOUTPublisherComponent except from the quote which need to be
+ * replaced by brackets due to CINT, e.g.
+ *
+ * <pre>
+ * aliroot -b -q extract-hltout-payload.C'("raw.root", "-datatype {DDL_RAW } ISDD")'
+ * aliroot -b -q extract-hltout-payload.C'("raw.root", "-origin {TPC }")'
+ * </pre>
+ *
+ * @author Matthias.Richter@ift.uib.no
+ * @ingroup alihlt_its
+ */
+void extract_hltout_payload(const char* input="./", const char* selection="")
+{
+  /////////////////////////////////////////////////////////////////////////
+  /////////////////////////////////////////////////////////////////////////
+  //
+  // setup of the HLT system
+  gSystem->Load("libHLTrec");
+  AliHLTSystem* pHLT=AliHLTReconstructorBase::GetInstance();
+  if (!pHLT) {
+    cerr << "fatal error: can not get HLT instance" << endl;
+  }
+
+  /////////////////////////////////////////////////////////////////////////
+  /////////////////////////////////////////////////////////////////////////
+  //
+  // the configuration chain
+  TString arg;
+
+  // the publisher configuration
+  arg.Form("%s", selection);
+  arg.ReplaceAll("{", "'");
+  arg.ReplaceAll("}", "'");
+  AliHLTConfiguration publisher("hltout-publisher", "AliHLTOUTPublisher" , NULL, arg.Data());
+
+  // the writer configuration
+  arg.Form("-subdir=event_%%d -blocknofmt= -datafile hltout.dat -specfmt");
+  AliHLTConfiguration collector("sink1", "FileWriter"   , "hltout-publisher", arg.Data());
+
+  /////////////////////////////////////////////////////////////////////////
+  /////////////////////////////////////////////////////////////////////////
+  //
+  // setup of the reconstruction
+
+  AliHLTReconstructor hltRec;
+  hltRec.Init("chains=sink1");
+
+  AliRawReader* rawreader=AliRawReader::Create(input);
+  if (!rawreader) {
+    return;
+  }
+  rawreader->RewindEvents();
+  int count=0;
+  if (!rawreader->NextEvent()) {
+    cout << "no events found in " << input << endl;
+    return;
+  }
+
+  do {
+    cout << "processing event " << count++ << endl;
+    hltRec.Reconstruct(rawreader, NULL);
+  } while (rawreader->NextEvent() && count<100);
+}