61 lines
2.0 KiB
C++
61 lines
2.0 KiB
C++
/* -*- c++ -*- */
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/*
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* @file
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* @author (C) 2017 by 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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#include <math.h>
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#include "time_sample_ref.h"
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namespace gr {
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namespace gsm {
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time_sample_ref::time_sample_ref(double samp_rate): d_samp_rate(samp_rate)
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{
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}
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time_sample_ref::~time_sample_ref()
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{
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}
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void time_sample_ref::update(time_spec_t last_rx_time, uint64_t current_start_offset)
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{
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d_last_rx_time = last_rx_time;
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d_current_start_offset = current_start_offset;
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}
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time_spec_t time_sample_ref::offset_to_time(uint64_t offset)
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{
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uint64_t samples_from_last_rx_time = offset - d_current_start_offset;
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time_spec_t time = time_spec_t(static_cast<double>(samples_from_last_rx_time)/d_samp_rate) + d_last_rx_time;
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return time;
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}
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uint64_t time_sample_ref::time_to_offset(time_spec_t time)
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{
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double samples_since_last_rx_time_tag = (time-d_last_rx_time).get_real_secs()*d_samp_rate;
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// double fractional_part = round(samples_since_last_rx_time_tag) - samples_since_last_rx_time_tag;
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uint64_t offset = static_cast<uint64_t>(round(samples_since_last_rx_time_tag)) + d_current_start_offset;
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return offset;
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}
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} // namespace gsm
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} // namespace gr
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