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/* -*- c++ -*- */
/*
* Copyright 2014 <+YOU OR YOUR COMPANY+>.
*
* This 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.
*
* This software 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 this software; 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 <gsm/gsmtap.h>
namespace gr {
namespace gsm {
universal_ctrl_chans_demapper::sptr
universal_ctrl_chans_demapper::make(const std::vector<int> &starts_fn_mod51, const std::vector<int> &channel_types)
{
return gnuradio::get_initial_sptr
(new universal_ctrl_chans_demapper_impl(starts_fn_mod51, channel_types));
}
/*
* The private constructor
*/
universal_ctrl_chans_demapper_impl::universal_ctrl_chans_demapper_impl(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=0;
for(int ii=0; ii<51; ii++)
{
d_starts_fn_mod51[ii]=0;
d_channel_types[ii]=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++;
}
}
}
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_blob = pmt::car(msg);
pmt::pmt_t content = pmt::cdr(msg);
gsmtap_hdr * header = (gsmtap_hdr *)pmt::blob_data(header_blob);
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];
header->sub_type = ch_type;
if(header->timeslot==d_timeslot){
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 */
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