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diff --git a/blocks/src/lib/op25_pcap_source_b.h b/blocks/src/lib/op25_pcap_source_b.h
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+++ b/blocks/src/lib/op25_pcap_source_b.h
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+/* -*- C++ -*- */
+
+/*
+ * Copyright 2010-2011 Steve Glass
+ * 
+ * This file is part of OP25.
+ * 
+ * OP25 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.
+ * 
+ * OP25 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 OP25; see the file COPYING.  If not, write to the Free
+ * Software Foundation, Inc., 51 Franklin Street, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#ifndef INCLUDED_OP25_PCAP_SOURCE_B_H
+#define INCLUDED_OP25_PCAP_SOURCE_B_H
+
+#include <boost/shared_ptr.hpp>
+#include <gr_sync_block.h>
+#include <stdint.h>
+#include <string>
+#include <vector>
+
+typedef boost::shared_ptr<class op25_pcap_source_b> op25_pcap_source_b_sptr;
+
+op25_pcap_source_b_sptr op25_make_pcap_source_b(const char *path, float delay);
+
+/**
+ * op25_pcap_source_b is a GNU Radio block for reading from a
+ * tcpdump-formatted capture file and producing a stream of octets.
+ */
+class op25_pcap_source_b : public gr_sync_block
+{
+public:
+
+   /**
+    * op25_pcap_source_b (virtual) destructor.
+    */
+   virtual ~op25_pcap_source_b();
+
+   /**
+    * Process symbols into frames.
+    */
+   virtual int work(int nof_output_items, gr_vector_const_void_star& input_items, gr_vector_void_star& output_items);
+
+private:
+
+   /**
+    * Expose class to public ctor. Create a new instance of
+    * op25_pcap_source_b and wrap it in a shared_ptr. This is
+    * effectively the public constructor.
+    *
+    * \param path The path to the tcpdump-formatted input file.
+    * \param delay The number of seconds to delay before sending the first frame.
+    */
+   friend op25_pcap_source_b_sptr op25_make_pcap_source_b(const char *path, float delay);
+
+   /**
+    * op25_pcap_source_b protected constructor.
+    *
+    * \param path The path to the tcpdump-formatted input file.
+    * \param delay The number of seconds to delay before sending the first frame.
+    */
+   op25_pcap_source_b(const char *path, float delay);
+
+private:
+
+   /**
+    * The next octet to be read from the input file.
+    */
+   size_t loc_;
+
+   /**
+    * Symbols from the input file.
+    */
+   std::vector<uint8_t> octets_;
+
+};
+
+#endif /* INCLUDED_OP25_PCAP_SOURCE_B_H */