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/* -*- c++ -*- */
/* @file
* @author Roman Khassraf <rkhassraf@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 "burst_sdcch_subslot_filter_impl.h"
#include <stdio.h>
#include <grgsm/endian.h>
#include <grgsm/gsmtap.h>
namespace gr {
namespace gsm {
burst_sdcch_subslot_filter::sptr
burst_sdcch_subslot_filter::make(subslot_filter_mode mode, unsigned int subslot)
{
return gnuradio::get_initial_sptr
(new burst_sdcch_subslot_filter_impl(mode, subslot));
}
/*
* The private constructor
*/
burst_sdcch_subslot_filter_impl::burst_sdcch_subslot_filter_impl(subslot_filter_mode mode, unsigned int subslot)
: gr::block("burst_sdcch_subslot_filter",
gr::io_signature::make(0, 0, 0),
gr::io_signature::make(0, 0, 0)),
d_mode(mode),
d_subslot(subslot)
{
message_port_register_in(pmt::mp("in"));
message_port_register_out(pmt::mp("out"));
set_msg_handler(pmt::mp("in"), boost::bind(&burst_sdcch_subslot_filter_impl::process_burst, this, _1));
}
/*
* Our virtual destructor.
*/
burst_sdcch_subslot_filter_impl::~burst_sdcch_subslot_filter_impl() {}
void burst_sdcch_subslot_filter_impl::process_burst(pmt::pmt_t msg)
{
// hardcoded subslots of the channels, both SDCCH and the associated SACCH
// -1 means that the particular position in the frame is not SDCCH
static const int8_t subslots_sdcch4[102] = {
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, 0, 0, 0, 0, 1, 1, 1, 1,-1,-1, 2, 2, 2, 2, 3, 3, 3, 3,-1,-1, 0, 0, 0, 0, 1, 1, 1, 1,-1,
-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, 0, 0, 0, 0, 1, 1, 1, 1,-1,-1, 2, 2, 2, 2, 3, 3, 3, 3,-1,-1, 2, 2, 2, 2, 3, 3, 3, 3,-1
};
static const int8_t subslots_sdcch8[102] = {
0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3,-1,-1,-1,
0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7,-1,-1,-1
};
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_mod102 = frame_nr % 102;
int8_t subslot;
if (d_mode == SS_FILTER_SDCCH8)
{
subslot = subslots_sdcch8[fn_mod102];
}
else if (d_mode == SS_FILTER_SDCCH4)
{
subslot = subslots_sdcch4[fn_mod102];
}
if ((subslot == -1) || (d_mode == SS_FILTER_SDCCH4 && subslot > 3))
{
return;
}
if (subslot == d_subslot)
{
message_port_pub(pmt::mp("out"), msg);
}
}
} /* namespace gsm */
} /* namespace gr */
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