diff options
Diffstat (limited to 'lib/flow_control/burst_sdcch_subslot_filter_impl.cc')
-rw-r--r-- | lib/flow_control/burst_sdcch_subslot_filter_impl.cc | 95 |
1 files changed, 95 insertions, 0 deletions
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 */ |