107 lines
2.7 KiB
C++
107 lines
2.7 KiB
C++
/* -*- c++ -*- */
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/*
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* @file
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* @author Piotr Krysik <ptrkrysik@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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <receiver_config.h>
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burst_counter & burst_counter::operator++(int)
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{
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d_timeslot_nr++;
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if (d_timeslot_nr == TS_PER_FRAME) {
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d_timeslot_nr = 0;
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if ((d_t2 == 25) && (d_t3 == 50)) {
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d_t1 = (d_t1 + 1) % (1 << 11);
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}
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d_t2 = (d_t2 + 1) % 26;
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d_t3 = (d_t3 + 1) % 51;
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}
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//update offset - this is integer for d_OSR which is multiple of four
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d_offset_fractional += GUARD_FRACTIONAL * d_OSR;
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d_offset_integer = floor(d_offset_fractional);
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d_offset_fractional = d_offset_fractional - d_offset_integer;
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return (*this);
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}
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burst_counter burst_counter::subtract_timeslots(unsigned int number_of_timeslots)
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{
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int timeslot_nr = (int)d_timeslot_nr - (int)number_of_timeslots;
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int t1,t2,t3;
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if (timeslot_nr < 0) {
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timeslot_nr = timeslot_nr + 8;
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t2 = (d_t2 - 1) % 26;
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t3 = (d_t3 - 1) % 51;
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if ((d_t2 == 0) && (d_t3 == 0)) {
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t1 = (d_t1 - 1) % (1 << 11);
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} else
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{
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t1 = d_t1;
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}
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}
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else
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{
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t1 = d_t1;
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t2 = d_t2;
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t3 = d_t3;
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}
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return burst_counter(d_OSR, t1, t2, t3, timeslot_nr);
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}
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void burst_counter::set(uint32_t t1, uint32_t t2, uint32_t t3, uint32_t timeslot_nr)
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{
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d_t1 = t1;
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d_t2 = t2;
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d_t3 = t3;
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d_timeslot_nr = timeslot_nr;
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double first_sample_position = (get_frame_nr() * 8 + timeslot_nr) * TS_BITS;
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d_offset_fractional = first_sample_position - floor(first_sample_position);
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d_offset_integer = 0;
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}
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burst_type channel_configuration::get_burst_type(burst_counter burst_nr)
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{
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uint32_t timeslot_nr = burst_nr.get_timeslot_nr();
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multiframe_type m_type = d_timeslots_descriptions[timeslot_nr].get_type();
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uint32_t nr;
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switch (m_type) {
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case multiframe_26:
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nr = burst_nr.get_t2();
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break;
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case multiframe_51:
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nr = burst_nr.get_t3();
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break;
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default:
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nr = 0;
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break;
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}
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return d_timeslots_descriptions[timeslot_nr].get_burst_type(nr);
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}
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