| /* -*- c++ -*- */ |
| /* |
| * @file |
| * @author 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> |
| |
| namespace gr { |
| namespace gsm { |
| |
| universal_ctrl_chans_demapper::sptr |
| universal_ctrl_chans_demapper::make(unsigned int timeslot_nr, const std::vector<int> &starts_fn_mod51, const std::vector<int> &channel_types) |
| { |
| return gnuradio::get_initial_sptr |
| (new universal_ctrl_chans_demapper_impl(timeslot_nr, starts_fn_mod51, channel_types)); |
| } |
| |
| /* |
| * The private constructor |
| */ |
| universal_ctrl_chans_demapper_impl::universal_ctrl_chans_demapper_impl(unsigned int timeslot_nr, const std::vector<int> &starts_fn_mod51, const std::vector<int> &channel_types) |
| : gr::block("universal_ctrl_chans_demapper", |
| gr::io_signature::make(0, 0, 0), |
| gr::io_signature::make(0, 0, 0)), |
| d_timeslot(timeslot_nr) |
| |
| { |
| |
| |
| for(int ii=0; ii<51; ii++) |
| { |
| d_starts_fn_mod51[ii]=0; |
| d_channel_types[ii]=0; |
| d_subslots[ii] = 0; |
| d_subslots[ii+51] = 0; |
| } |
| |
| std::vector<int>::const_iterator s; |
| std::vector<int>::const_iterator ch_type; |
| |
| for(s=starts_fn_mod51.begin(), ch_type=channel_types.begin();s != starts_fn_mod51.end(); s++) |
| { |
| if((*s >= 0) and (*s <= (51-4))) |
| { |
| for(int ii=0; ii<4; ii++){ |
| d_starts_fn_mod51[*s+ii] = *s; |
| if(ch_type!=channel_types.end()) |
| { |
| d_channel_types[*s+ii] = *ch_type; |
| } |
| } |
| if(ch_type!=channel_types.end()) |
| { |
| ch_type++; |
| } |
| } |
| } |
| |
| std::set<int> distinct_channels(channel_types.begin(), channel_types.end()); |
| std::set<int>::iterator it; |
| unsigned int subslot; |
| |
| for (it=distinct_channels.begin(); it != distinct_channels.end(); it++) |
| { |
| subslot = 0; |
| for(s=starts_fn_mod51.begin();s != starts_fn_mod51.end(); s++) |
| { |
| if ((d_channel_types[*s] == *it) and (*s >= 0) and (*s <= (51-4))) |
| { |
| for(int ii=0; ii<4; ii++) |
| { |
| d_subslots[*s+ii] = subslot; |
| d_subslots[*s+ii+51] = subslot; |
| } |
| subslot++; |
| } |
| } |
| |
| if (*it == GSMTAP_CHANNEL_ACCH or |
| *it == (GSMTAP_CHANNEL_ACCH|GSMTAP_CHANNEL_SDCCH) or |
| *it == (GSMTAP_CHANNEL_ACCH|GSMTAP_CHANNEL_SDCCH4) or |
| *it == (GSMTAP_CHANNEL_ACCH|GSMTAP_CHANNEL_SDCCH8) or |
| *it == (GSMTAP_CHANNEL_ACCH|GSMTAP_CHANNEL_TCH_F) or |
| *it == (GSMTAP_CHANNEL_ACCH|GSMTAP_CHANNEL_TCH_H) |
| ) |
| { |
| for(s=starts_fn_mod51.begin();s != starts_fn_mod51.end(); s++) |
| { |
| if ((d_channel_types[*s] == *it) and (*s >= 0) and (*s <= (51-4))) |
| { |
| for(int ii=0; ii<4; ii++) |
| { |
| d_subslots[*s+ii+51] = subslot; |
| } |
| subslot++; |
| } |
| } |
| } |
| } |
| |
| |
| 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 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_mod51 = frame_nr % 51; |
| uint32_t fn51_start = d_starts_fn_mod51[fn_mod51]; |
| uint32_t fn51_stop = fn51_start + 3; |
| uint32_t ch_type = d_channel_types[fn_mod51]; |
| |
| if(header->timeslot==d_timeslot){ |
| header->sub_type = ch_type; |
| header->sub_slot = d_subslots[fn_mod51 + (51 * (frame_nr % 2))]; |
| |
| if(fn_mod51>=fn51_start && fn_mod51<=fn51_stop) |
| { |
| uint32_t ii = fn_mod51 - fn51_start; |
| d_frame_numbers[ii] = frame_nr; |
| d_bursts[ii] = msg; |
| } |
| |
| 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((d_frame_numbers[jj]-d_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"), d_bursts[jj]); |
| } |
| } |
| } |
| } |
| } |
| } /* namespace gsm */ |
| } /* namespace gr */ |
| |