136 lines
4.4 KiB
C++
136 lines
4.4 KiB
C++
/* -*- c++ -*- */
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/*
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* Copyright 2014 <+YOU OR YOUR COMPANY+>.
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3, or (at your option)
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* any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <gnuradio/io_signature.h>
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#include "universal_ctrl_chans_demapper_impl.h"
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#include <gsm/endian.h>
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#include <gsm/gsmtap.h>
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namespace gr {
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namespace gsm {
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universal_ctrl_chans_demapper::sptr
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universal_ctrl_chans_demapper::make(const std::vector<int> &starts_fn_mod51, const std::vector<int> &channel_types)
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{
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return gnuradio::get_initial_sptr
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(new universal_ctrl_chans_demapper_impl(starts_fn_mod51, channel_types));
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}
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/*
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* The private constructor
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*/
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universal_ctrl_chans_demapper_impl::universal_ctrl_chans_demapper_impl(const std::vector<int> &starts_fn_mod51, const std::vector<int> &channel_types)
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: gr::block("universal_ctrl_chans_demapper",
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gr::io_signature::make(0, 0, 0),
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gr::io_signature::make(0, 0, 0))
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{
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d_timeslot=0;
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for(int ii=0; ii<51; ii++)
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{
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d_starts_fn_mod51[ii]=0;
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d_channel_types[ii]=0;
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}
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std::vector<int>::const_iterator s;
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std::vector<int>::const_iterator ch_type;
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for(s=starts_fn_mod51.begin(), ch_type=channel_types.begin();s != starts_fn_mod51.end(); s++)
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{
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if((*s > 0) and (*s < (51-4)))
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{
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for(int ii=0; ii<4; ii++){
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d_starts_fn_mod51[*s+ii] = *s;
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if(ch_type!=channel_types.end())
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{
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d_channel_types[*s+ii] = *ch_type;
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}
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}
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if(ch_type!=channel_types.end())
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{
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ch_type++;
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}
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}
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}
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message_port_register_in(pmt::mp("bursts"));
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set_msg_handler(pmt::mp("bursts"), boost::bind(&universal_ctrl_chans_demapper_impl::filter_ctrl_chans, this, _1));
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message_port_register_out(pmt::mp("bursts"));
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}
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/*
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* Our virtual destructor.
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*/
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universal_ctrl_chans_demapper_impl::~universal_ctrl_chans_demapper_impl()
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{
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}
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void universal_ctrl_chans_demapper_impl::filter_ctrl_chans(pmt::pmt_t msg)
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{
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pmt::pmt_t header_plus_burst = pmt::cdr(msg);
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gsmtap_hdr * header = (gsmtap_hdr *)pmt::blob_data(header_plus_burst);
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uint32_t frame_nr = be32toh(header->frame_number);
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uint32_t fn_mod51 = frame_nr % 51;
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uint32_t fn51_start = d_starts_fn_mod51[fn_mod51];
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uint32_t fn51_stop = fn51_start + 3;
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uint32_t ch_type = d_channel_types[fn_mod51];
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header->sub_type = ch_type;
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if(header->timeslot==d_timeslot){
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if(fn_mod51>=fn51_start && fn_mod51<=fn51_stop)
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{
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uint32_t ii = fn_mod51 - fn51_start;
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d_frame_numbers[ii] = frame_nr;
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d_bursts[ii] = msg;
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}
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if(fn_mod51==fn51_stop)
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{
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//check for a situation where some bursts were lost
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//in this situation frame numbers won't be consecutive
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bool frames_are_consecutive = true;
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for(int jj=1; jj<4; jj++)
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{
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if((d_frame_numbers[jj]-d_frame_numbers[jj-1])!=1)
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{
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frames_are_consecutive = false;
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}
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}
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if(frames_are_consecutive)
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{
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//send bursts to the output
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for(int jj=0; jj<4; jj++)
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{
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message_port_pub(pmt::mp("bursts"), d_bursts[jj]);
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}
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}
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}
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}
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}
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} /* namespace gsm */
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} /* namespace gr */
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