1 files changed, 47 insertions, 0 deletions
diff --git a/gr-vrt/src/missing_pkt_checker.cc b/gr-vrt/src/missing_pkt_checker.cc
new file mode 100644
index 000000000..09b70fe2c
--- /dev/null
+++ b/gr-vrt/src/missing_pkt_checker.cc
@@ -0,0 +1,47 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2009 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include <missing_pkt_checker.h>
+
+int
+missing_pkt_checker::check(const vrt::expanded_header *hdr)
+{
+  // FIXME assumes we're inspecting only a single stream
+
+  int nmissing = 0;
+  int actual = hdr->pkt_cnt();
+  int expected = (d_last_pkt_cnt + 1) & 0xf;
+  if (actual != expected && !d_resync){
+    d_nwrong_pkt_cnt++;
+    if (actual > expected)
+      nmissing = actual - expected;
+    else
+      nmissing = actual + 16 - expected;
+    d_nmissing_pkt_est += nmissing;
+  }
+  d_last_pkt_cnt = actual;
+  d_npackets++;
+  d_resync = false;
+  return nmissing;
+}