| /* -*- c++ -*- */ |
| /* |
| * @file |
| * @author (C) 2016 by Piotr Krysik <ptrkrysik@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 "universal_ctrl_chans_demapper_impl.h" |
| #include <grgsm/endian.h> |
| #include <grgsm/gsmtap.h> |
| #include <set> |
| |
| #define BURST_SIZE 148 |
| |
| namespace gr { |
| namespace gsm { |
| |
| universal_ctrl_chans_demapper::sptr |
| universal_ctrl_chans_demapper::make(unsigned int timeslot_nr, const std::vector<int> &downlink_starts_fn_mod51, const std::vector<int> &downlink_channel_types, const std::vector<int> &downlink_subslots, const std::vector<int> &uplink_starts_fn_mod51, const std::vector<int> &uplink_channel_types, const std::vector<int> &uplink_subslots) |
| { |
| return gnuradio::get_initial_sptr |
| (new universal_ctrl_chans_demapper_impl(timeslot_nr, downlink_starts_fn_mod51, downlink_channel_types, downlink_subslots, uplink_starts_fn_mod51, uplink_channel_types, uplink_subslots)); |
| } |
| |
| /* |
| * The private constructor |
| */ |
| universal_ctrl_chans_demapper_impl::universal_ctrl_chans_demapper_impl(unsigned int timeslot_nr, const std::vector<int> &downlink_starts_fn_mod51, const std::vector<int> &downlink_channel_types, const std::vector<int> &downlink_subslots, const std::vector<int> &uplink_starts_fn_mod51, const std::vector<int> &uplink_channel_types, const std::vector<int> &uplink_subslots) |
| : gr::block("universal_ctrl_chans_demapper", |
| gr::io_signature::make(0, 0, 0), |
| gr::io_signature::make(0, 0, 0)), |
| d_timeslot_nr(timeslot_nr), |
| d_downlink_starts_fn_mod51(51, 0), |
| d_downlink_channel_types(51, 0), |
| d_downlink_subslots(102, 0), |
| d_uplink_starts_fn_mod51(51, 0), |
| d_uplink_channel_types(51, 0), |
| d_uplink_subslots(102, 0) |
| { |
| if(downlink_starts_fn_mod51.size() != 51 || |
| downlink_channel_types.size() != 51 || |
| downlink_subslots.size() != 102 || |
| uplink_starts_fn_mod51.size() != 51 || |
| uplink_channel_types.size() != 51 || |
| uplink_subslots.size() != 102 ) |
| { |
| std::cout << "Check lengths of the vectors passed to the universal demapper - _starts_fn_mod15 and _sublots should have 51 elements, _subslots should have 102 elements" << std::endl; |
| std::runtime_error("Check lengths of the vectors passed to the universal demapper - _starts_fn_mod15 and _sublots should have 51 elements, _subslots should have 102 elements"); |
| } |
| std::copy(downlink_starts_fn_mod51.begin(), downlink_starts_fn_mod51.end(), d_downlink_starts_fn_mod51.begin()); |
| std::copy(downlink_channel_types.begin(), downlink_channel_types.end(), d_downlink_channel_types.begin()); |
| std::copy(downlink_subslots.begin(), downlink_subslots.end(), d_downlink_subslots.begin()); |
| std::copy(uplink_starts_fn_mod51.begin(), uplink_starts_fn_mod51.end(), d_uplink_starts_fn_mod51.begin()); |
| std::copy(uplink_channel_types.begin(), uplink_channel_types.end(), d_uplink_channel_types.begin()); |
| std::copy(uplink_subslots.begin(), uplink_subslots.end(), d_uplink_subslots.begin()); |
| |
| message_port_register_in(pmt::mp("bursts")); |
| set_msg_handler(pmt::mp("bursts"), boost::bind(&universal_ctrl_chans_demapper_impl::filter_ctrl_chans, this, _1)); |
| message_port_register_out(pmt::mp("bursts")); |
| } |
| |
| /* |
| * Our virtual destructor. |
| */ |
| universal_ctrl_chans_demapper_impl::~universal_ctrl_chans_demapper_impl() |
| { |
| } |
| |
| void universal_ctrl_chans_demapper_impl::filter_ctrl_chans(pmt::pmt_t burst_in) |
| { |
| pmt::pmt_t header_plus_burst = pmt::cdr(burst_in); |
| int8_t * burst_in_int8 = (int8_t *)pmt::blob_data(header_plus_burst); |
| gsmtap_hdr * header = (gsmtap_hdr *)(burst_in_int8); |
| |
| if(header->timeslot==d_timeslot_nr) |
| { |
| int * starts_fn_mod51; |
| int * channel_types; |
| int * subslots; |
| uint32_t * frame_numbers; |
| pmt::pmt_t * bursts; |
| |
| uint32_t frame_nr = be32toh(header->frame_number); //get frame number |
| uint32_t fn_mod51 = frame_nr % 51; //frame number modulo 51 |
| uint32_t fn_mod102 = frame_nr % 102; //frame number modulo 102 |
| |
| //create new burst |
| int8_t burst_tmp[sizeof(gsmtap_hdr)+BURST_SIZE]; |
| memcpy(burst_tmp, burst_in_int8, sizeof(gsmtap_hdr)+BURST_SIZE); |
| pmt::pmt_t msg_binary_blob = pmt::make_blob(burst_tmp,sizeof(gsmtap_hdr)+BURST_SIZE); |
| pmt::pmt_t burst_out = pmt::cons(pmt::PMT_NIL, msg_binary_blob); |
| gsmtap_hdr * new_header = (gsmtap_hdr *)pmt::blob_data(msg_binary_blob); |
| |
| //get information if burst is from uplink or downlink |
| bool uplink_burst = (be16toh(header->arfcn) & 0x4000) ? true : false; |
| |
| //select right set of configuration and history for uplink or downlink |
| if(uplink_burst) { |
| starts_fn_mod51 = &d_uplink_starts_fn_mod51[0]; |
| channel_types = &d_uplink_channel_types[0]; |
| subslots = &d_uplink_subslots[0]; |
| frame_numbers = d_uplink_frame_numbers; |
| bursts = d_uplink_bursts; |
| } else { |
| starts_fn_mod51 = &d_downlink_starts_fn_mod51[0]; |
| channel_types = &d_downlink_channel_types[0]; |
| subslots = &d_downlink_subslots[0]; |
| frame_numbers = d_downlink_frame_numbers; |
| bursts = d_downlink_bursts; |
| } |
| |
| uint32_t fn51_start = starts_fn_mod51[fn_mod51]; |
| uint32_t fn51_stop = fn51_start + 3; |
| |
| //set type |
| new_header->type = GSMTAP_TYPE_UM; |
| //set type of the channel |
| uint32_t ch_type = channel_types[fn_mod51]; |
| if(ch_type != 0) |
| { |
| new_header->sub_type = ch_type; |
| } |
| new_header->sub_slot = subslots[fn_mod51 + (51 * (frame_nr % 2))]; |
| |
| if(fn_mod51>=fn51_start && fn_mod51<=fn51_stop) |
| { |
| uint32_t ii = fn_mod51 - fn51_start; |
| frame_numbers[ii] = frame_nr; |
| bursts[ii] = burst_out; |
| } |
| |
| if(fn_mod51==fn51_stop) |
| { |
| //check for a situation where some bursts were lost |
| //in this situation frame numbers won't be consecutive |
| bool frames_are_consecutive = true; |
| for(int jj=1; jj<4; jj++) |
| { |
| if((frame_numbers[jj] - frame_numbers[jj-1])!=1) |
| { |
| frames_are_consecutive = false; |
| } |
| } |
| if(frames_are_consecutive) |
| { |
| //send bursts to the output |
| for(int jj=0; jj<4; jj++) |
| { |
| message_port_pub(pmt::mp("bursts"), bursts[jj]); |
| } |
| } |
| } |
| } |
| } |
| } /* namespace gsm */ |
| } /* namespace gr */ |