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Diffstat (limited to 'lib/receiver/time_sample_ref.cc')
-rw-r--r-- | lib/receiver/time_sample_ref.cc | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/lib/receiver/time_sample_ref.cc b/lib/receiver/time_sample_ref.cc new file mode 100644 index 0000000..0cf85ed --- /dev/null +++ b/lib/receiver/time_sample_ref.cc @@ -0,0 +1,60 @@ +/* -*- 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 + |