Implemented burst sdcch subslot filter. Issue #100
diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index 0d61b7d..a842823 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -49,6 +49,7 @@
flow_control/burst_timeslot_splitter_impl.cc
flow_control/burst_sdcch_subslot_splitter_impl.cc
flow_control/burst_timeslot_filter_impl.cc
+ flow_control/burst_sdcch_subslot_filter_impl.cc
flow_control/burst_fnr_filter_impl.cc
flow_control/dummy_burst_filter_impl.cc
misc_utils/controlled_rotator_cc_impl.cc
diff --git a/lib/flow_control/burst_sdcch_subslot_filter_impl.cc b/lib/flow_control/burst_sdcch_subslot_filter_impl.cc
new file mode 100644
index 0000000..9f27fcd
--- /dev/null
+++ b/lib/flow_control/burst_sdcch_subslot_filter_impl.cc
@@ -0,0 +1,95 @@
+/* -*- 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_sdcch_subslot_filter_impl.h"
+#include <stdio.h>
+#include <grgsm/endian.h>
+#include <grgsm/gsmtap.h>
+
+
+namespace gr {
+ namespace gsm {
+
+ burst_sdcch_subslot_filter::sptr
+ burst_sdcch_subslot_filter::make(subslot_filter_mode mode, unsigned int subslot)
+ {
+ return gnuradio::get_initial_sptr
+ (new burst_sdcch_subslot_filter_impl(mode, subslot));
+ }
+
+ /*
+ * The private constructor
+ */
+ burst_sdcch_subslot_filter_impl::burst_sdcch_subslot_filter_impl(subslot_filter_mode mode, unsigned int subslot)
+ : gr::block("burst_sdcch_subslot_filter",
+ gr::io_signature::make(0, 0, 0),
+ gr::io_signature::make(0, 0, 0)),
+ d_mode(mode),
+ d_subslot(subslot)
+ {
+ message_port_register_in(pmt::mp("in"));
+ message_port_register_out(pmt::mp("out"));
+
+ set_msg_handler(pmt::mp("in"), boost::bind(&burst_sdcch_subslot_filter_impl::process_burst, this, _1));
+ }
+
+ /*
+ * Our virtual destructor.
+ */
+ burst_sdcch_subslot_filter_impl::~burst_sdcch_subslot_filter_impl() {}
+
+ void burst_sdcch_subslot_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);
+
+ uint32_t frame_nr = be32toh(header->frame_number);
+ uint32_t fn_mod102 = frame_nr % 102;
+
+ int8_t subslot;
+
+ if (d_mode == SS_FILTER_SDCCH8)
+ {
+ subslot = d_subslots_sdcch8[fn_mod102];
+ }
+ else if (d_mode == SS_FILTER_SDCCH4)
+ {
+ subslot = d_subslots_sdcch4[fn_mod102];
+ }
+
+ if ((subslot == -1) || (d_mode == SS_FILTER_SDCCH4 && subslot > 3))
+ {
+ return;
+ }
+
+ if (subslot == d_subslot)
+ {
+ message_port_pub(pmt::mp("out"), msg);
+ }
+ }
+ } /* namespace gsm */
+} /* namespace gr */
diff --git a/lib/flow_control/burst_sdcch_subslot_filter_impl.h b/lib/flow_control/burst_sdcch_subslot_filter_impl.h
new file mode 100644
index 0000000..05038d7
--- /dev/null
+++ b/lib/flow_control/burst_sdcch_subslot_filter_impl.h
@@ -0,0 +1,55 @@
+/* -*- 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.
+ *
+ */
+
+#ifndef INCLUDED_GSM_BURST_SDCCH_SUBSLOT_FILTER_IMPL_H
+#define INCLUDED_GSM_BURST_SDCCH_SUBSLOT_FILTER_IMPL_H
+
+#include <grgsm/flow_control/burst_sdcch_subslot_filter.h>
+
+namespace gr {
+ namespace gsm {
+
+ class burst_sdcch_subslot_filter_impl : public burst_sdcch_subslot_filter
+ {
+ private:
+ // hardcoded subslots of the channels, both SDCCH and the associated SACCH
+ // -1 means that the particular position in the frame is not SDCCH
+ const int8_t d_subslots_sdcch4[102] = {
+ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, 0, 0, 0, 0, 1, 1, 1, 1,-1,-1, 2, 2, 2, 2, 3, 3, 3, 3,-1,-1, 0, 0, 0, 0, 1, 1, 1, 1,-1,
+ -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, 0, 0, 0, 0, 1, 1, 1, 1,-1,-1, 2, 2, 2, 2, 3, 3, 3, 3,-1,-1, 2, 2, 2, 2, 3, 3, 3, 3,-1
+ };
+ const int8_t d_subslots_sdcch8[102] = {
+ 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3,-1,-1,-1,
+ 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7,-1,-1,-1
+ };
+ subslot_filter_mode d_mode;
+ unsigned int d_subslot;
+ public:
+ burst_sdcch_subslot_filter_impl(subslot_filter_mode mode, unsigned int subslot);
+ ~burst_sdcch_subslot_filter_impl();
+ void process_burst(pmt::pmt_t msg);
+ };
+
+ } // namespace gsm
+} // namespace gr
+
+#endif /* INCLUDED_GSM_BURST_SDCCH_SUBSLOT_FILTER_IMPL_H */