| /* -*- c++ -*- */ |
| /* |
| * @file |
| * @author (C) 2009-2017 by 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 <cmath> |
| #include <receiver_config.h> |
| |
| |
| burst_counter & burst_counter::operator++(int) |
| { |
| d_timeslot_nr++; |
| if (d_timeslot_nr == TS_PER_FRAME) { |
| d_timeslot_nr = 0; |
| |
| if ((d_t2 == 25) && (d_t3 == 50)) { |
| d_t1 = (d_t1 + 1) % (1 << 11); |
| } |
| |
| d_t2 = (d_t2 + 1) % 26; |
| d_t3 = (d_t3 + 1) % 51; |
| } |
| |
| //update offset - this is integer for d_OSR which is multiple of four |
| d_offset_fractional += GUARD_FRACTIONAL * d_OSR; |
| d_offset_integer = floor(d_offset_fractional); |
| d_offset_fractional = d_offset_fractional - d_offset_integer; |
| return (*this); |
| } |
| |
| burst_counter burst_counter::subtract_timeslots(unsigned int number_of_timeslots) |
| { |
| int timeslot_nr = (int)d_timeslot_nr - (int)number_of_timeslots; |
| int t1,t2,t3; |
| if (timeslot_nr < 0) { |
| timeslot_nr = timeslot_nr + 8; |
| |
| t2 = (d_t2+26 - 1) % 26; |
| t3 = (d_t3+51 - 1) % 51; |
| |
| if ((d_t2 == 0) && (d_t3 == 0)) { |
| t1 = (d_t1 - 1) % (1 << 11); |
| } else |
| { |
| t1 = d_t1; |
| } |
| } |
| else |
| { |
| t1 = d_t1; |
| t2 = d_t2; |
| t3 = d_t3; |
| } |
| |
| return burst_counter(d_OSR, t1, t2, t3, timeslot_nr); |
| } |
| |
| void burst_counter::set(uint32_t t1, uint32_t t2, uint32_t t3, uint32_t timeslot_nr) |
| { |
| d_t1 = t1; |
| d_t2 = t2; |
| d_t3 = t3; |
| d_timeslot_nr = timeslot_nr; |
| double first_sample_position = (get_frame_nr() * 8 + timeslot_nr) * TS_BITS; |
| d_offset_fractional = first_sample_position - floor(first_sample_position); |
| d_offset_integer = 0; |
| } |
| |
| burst_type channel_configuration::get_burst_type(burst_counter burst_nr) |
| { |
| uint32_t timeslot_nr = burst_nr.get_timeslot_nr(); |
| multiframe_type m_type = d_timeslots_descriptions[timeslot_nr].get_type(); |
| uint32_t nr; |
| |
| switch (m_type) { |
| case multiframe_26: |
| nr = burst_nr.get_t2(); |
| break; |
| case multiframe_51: |
| nr = burst_nr.get_t3(); |
| break; |
| default: |
| nr = 0; |
| break; |
| } |
| |
| return d_timeslots_descriptions[timeslot_nr].get_burst_type(nr); |
| } |