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/* -*- 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>
#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 */
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