| /* -*- c++ -*- */ |
| /* |
| * @file |
| * @author (C) 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. |
| */ |
| |
| #include <math.h> |
| #include "time_sample_ref.h" |
| |
| namespace gr { |
| namespace gsm { |
| time_sample_ref::time_sample_ref(double samp_rate): d_samp_rate(samp_rate) |
| { |
| } |
| |
| time_sample_ref::~time_sample_ref() |
| { |
| } |
| |
| void time_sample_ref::update(time_spec_t last_rx_time, uint64_t current_start_offset) |
| { |
| d_last_rx_time = last_rx_time; |
| d_current_start_offset = current_start_offset; |
| } |
| |
| time_spec_t time_sample_ref::offset_to_time(uint64_t offset) |
| { |
| uint64_t samples_from_last_rx_time = offset - d_current_start_offset; |
| time_spec_t time = time_spec_t(static_cast<double>(samples_from_last_rx_time)/d_samp_rate) + d_last_rx_time; |
| |
| return time; |
| } |
| |
| uint64_t time_sample_ref::time_to_offset(time_spec_t time) |
| { |
| double samples_since_last_rx_time_tag = (time-d_last_rx_time).get_real_secs()*d_samp_rate; |
| // double fractional_part = round(samples_since_last_rx_time_tag) - samples_since_last_rx_time_tag; |
| uint64_t offset = static_cast<uint64_t>(round(samples_since_last_rx_time_tag)) + d_current_start_offset; |
| |
| return offset; |
| } |
| } // namespace gsm |
| } // namespace gr |
| |