Implemented burst framenumber filter. Issue #100
diff --git a/lib/flow_control/burst_fnr_filter_impl.cc b/lib/flow_control/burst_fnr_filter_impl.cc
new file mode 100644
index 0000000..1aa6f5b
--- /dev/null
+++ b/lib/flow_control/burst_fnr_filter_impl.cc
@@ -0,0 +1,79 @@
+/* -*- c++ -*- */
+/* @file
+ * @author Roman Khassraf <rkhassraf@gmail.com>
+ * @section LICENSE
+ *
+ * Gr-gsm 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.
+ *
+ * Gr-gsm 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 gr-gsm; see the file COPYING. If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gnuradio/io_signature.h>
+#include "burst_fnr_filter_impl.h"
+#include <stdio.h>
+#include <grgsm/endian.h>
+#include <grgsm/gsmtap.h>
+
+
+namespace gr {
+ namespace gsm {
+
+ burst_fnr_filter::sptr
+ burst_fnr_filter::make(filter_mode mode, unsigned int fnr)
+ {
+ return gnuradio::get_initial_sptr
+ (new burst_fnr_filter_impl(mode, fnr));
+ }
+
+ /*
+ * The private constructor
+ */
+ burst_fnr_filter_impl::burst_fnr_filter_impl(filter_mode mode, unsigned int fnr)
+ : gr::block("burst_fnr_filter",
+ gr::io_signature::make(0, 0, 0),
+ gr::io_signature::make(0, 0, 0)),
+ d_mode(mode),
+ d_framenr(fnr)
+ {
+ message_port_register_in(pmt::mp("in"));
+ message_port_register_out(pmt::mp("out"));
+
+ set_msg_handler(pmt::mp("in"), boost::bind(&burst_fnr_filter_impl::process_burst, this, _1));
+ }
+
+ /*
+ * Our virtual destructor.
+ */
+ burst_fnr_filter_impl::~burst_fnr_filter_impl() {}
+
+ void burst_fnr_filter_impl::process_burst(pmt::pmt_t msg)
+ {
+ pmt::pmt_t header_plus_burst = pmt::cdr(msg);
+ gsmtap_hdr * header = (gsmtap_hdr *)pmt::blob_data(header_plus_burst);
+
+ unsigned int frame_nr = be32toh(header->frame_number);
+
+ if ((d_mode == FILTER_LESS_OR_EQUAL && frame_nr <= d_framenr)
+ || d_mode == FILTER_GREATER_OR_EQUAL && frame_nr >= d_framenr)
+ {
+ message_port_pub(pmt::mp("out"), msg);
+ }
+ }
+ } /* namespace gsm */
+} /* namespace gr */