161 lines
4.9 KiB
C++
161 lines
4.9 KiB
C++
/* -*- c++ -*- */
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/* @file
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* @author (C) 2015 by Roman Khassraf <rkhassraf@gmail.com>
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* @section LICENSE
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*
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* Gr-gsm 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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* Gr-gsm 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 gr-gsm; 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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*/
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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 "burst_sdcch_subslot_filter_impl.h"
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#include <stdio.h>
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#include <grgsm/endian.h>
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#include <grgsm/gsmtap.h>
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namespace gr {
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namespace gsm {
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burst_sdcch_subslot_filter::sptr
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burst_sdcch_subslot_filter::make(subslot_filter_mode mode, unsigned int subslot)
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{
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return gnuradio::get_initial_sptr
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(new burst_sdcch_subslot_filter_impl(mode, subslot));
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}
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/*
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* The private constructor
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*/
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burst_sdcch_subslot_filter_impl::burst_sdcch_subslot_filter_impl(subslot_filter_mode mode, unsigned int subslot)
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: gr::block("burst_sdcch_subslot_filter",
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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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d_mode(mode),
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d_subslot(subslot),
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d_filter_policy(FILTER_POLICY_DEFAULT)
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{
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message_port_register_in(pmt::mp("in"));
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message_port_register_out(pmt::mp("out"));
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set_msg_handler(pmt::mp("in"), boost::bind(&burst_sdcch_subslot_filter_impl::process_burst, this, _1));
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}
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/*
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* Our virtual destructor.
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*/
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burst_sdcch_subslot_filter_impl::~burst_sdcch_subslot_filter_impl() {}
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void burst_sdcch_subslot_filter_impl::process_burst(pmt::pmt_t msg)
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{
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// hardcoded subslots of the channels, both SDCCH and the associated SACCH
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// -1 means that the particular position in the frame is not SDCCH
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static const int8_t subslots_sdcch4[102] = {
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-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,
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-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
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};
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static const int8_t subslots_sdcch8[102] = {
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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,
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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
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};
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if (d_filter_policy == FILTER_POLICY_DROP_ALL)
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return;
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if (d_filter_policy == FILTER_POLICY_PASS_ALL) {
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message_port_pub(pmt::mp("out"), msg);
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return;
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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_mod102 = frame_nr % 102;
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int8_t subslot;
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if (d_mode == SS_FILTER_SDCCH8)
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{
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subslot = subslots_sdcch8[fn_mod102];
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}
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else if (d_mode == SS_FILTER_SDCCH4)
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{
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subslot = subslots_sdcch4[fn_mod102];
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}
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if ((subslot == -1) || (d_mode == SS_FILTER_SDCCH4 && subslot > 3))
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{
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return;
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}
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if (subslot == d_subslot)
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{
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message_port_pub(pmt::mp("out"), msg);
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}
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}
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/* External API */
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unsigned int
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burst_sdcch_subslot_filter_impl::get_ss(void)
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{
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return d_subslot;
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}
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unsigned int
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burst_sdcch_subslot_filter_impl::set_ss(unsigned int ss)
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{
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if ((d_mode == SS_FILTER_SDCCH8 && ss < 8)
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|| (d_mode == SS_FILTER_SDCCH4 && ss < 4))
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d_subslot = ss;
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return d_subslot;
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}
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subslot_filter_mode
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burst_sdcch_subslot_filter_impl::get_mode(void)
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{
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return d_mode;
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}
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subslot_filter_mode
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burst_sdcch_subslot_filter_impl::set_mode(subslot_filter_mode mode)
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{
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d_mode = mode;
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return d_mode;
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}
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/* Filtering policy */
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filter_policy
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burst_sdcch_subslot_filter_impl::get_policy(void)
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{
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return d_filter_policy;
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}
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filter_policy
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burst_sdcch_subslot_filter_impl::set_policy(filter_policy policy)
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{
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d_filter_policy = policy;
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return d_filter_policy;
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}
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} /* namespace gsm */
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} /* namespace gr */
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