| /* -*- c++ -*- */ |
| /* @file |
| * @author (C) 2015 by 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), |
| d_filter_policy(FILTER_POLICY_DEFAULT) |
| { |
| 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) |
| { |
| // hardcoded subslots of the channels, both SDCCH and the associated SACCH |
| // -1 means that the particular position in the frame is not SDCCH |
| static const int8_t 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 |
| }; |
| static const int8_t 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 |
| }; |
| |
| if (d_filter_policy == FILTER_POLICY_DROP_ALL) |
| return; |
| |
| if (d_filter_policy == FILTER_POLICY_PASS_ALL) { |
| message_port_pub(pmt::mp("out"), msg); |
| return; |
| } |
| |
| 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 = subslots_sdcch8[fn_mod102]; |
| } |
| else if (d_mode == SS_FILTER_SDCCH4) |
| { |
| subslot = 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); |
| } |
| } |
| |
| /* External API */ |
| unsigned int |
| burst_sdcch_subslot_filter_impl::get_ss(void) |
| { |
| return d_subslot; |
| } |
| |
| unsigned int |
| burst_sdcch_subslot_filter_impl::set_ss(unsigned int ss) |
| { |
| if ((d_mode == SS_FILTER_SDCCH8 && ss < 8) |
| || (d_mode == SS_FILTER_SDCCH4 && ss < 4)) |
| d_subslot = ss; |
| |
| return d_subslot; |
| } |
| |
| |
| subslot_filter_mode |
| burst_sdcch_subslot_filter_impl::get_mode(void) |
| { |
| return d_mode; |
| } |
| |
| subslot_filter_mode |
| burst_sdcch_subslot_filter_impl::set_mode(subslot_filter_mode mode) |
| { |
| d_mode = mode; |
| return d_mode; |
| } |
| |
| /* Filtering policy */ |
| filter_policy |
| burst_sdcch_subslot_filter_impl::get_policy(void) |
| { |
| return d_filter_policy; |
| } |
| |
| filter_policy |
| burst_sdcch_subslot_filter_impl::set_policy(filter_policy policy) |
| { |
| d_filter_policy = policy; |
| return d_filter_policy; |
| } |
| |
| } /* namespace gsm */ |
| } /* namespace gr */ |