| /* -*- 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. |
| */ |
| |
| #ifndef INCLUDED_TIME_SAMPLE_REF_IMPL_H |
| #define INCLUDED_TIME_SAMPLE_REF_IMPL_H |
| |
| #include <stdint.h> |
| #include <grgsm/misc_utils/time_spec.h> |
| |
| namespace gr { |
| namespace gsm { |
| /* |
| Class for storing time reference and for conversions time<->sample number. |
| N - number of sample before the resampler |
| M - number of sample after the resampler |
| t - time before the resampler |
| */ |
| class time_sample_ref |
| { |
| private: |
| double d_samp_rate; |
| double d_resamp_rate; |
| |
| time_spec_t d_ref_time; |
| uint64_t d_ref_offset;/**< sample offset of the reference point */ |
| uint64_t d_original_ref_offset;/**< sample offset of the |
| reference point before resampler */ |
| public: |
| time_sample_ref(double samp_rate, double resamp_rate = 1.0); |
| ~time_sample_ref(); |
| |
| void update(uint64_t M, uint64_t N){ |
| d_ref_time = time_spec_t::from_ticks(N - d_original_ref_offset, d_samp_rate*d_resamp_rate) + d_ref_time; |
| d_original_ref_offset = N; |
| d_ref_offset = M; |
| } |
| |
| void update(uint64_t M, uint64_t N, double resamp_rate){ |
| // std::cout << "M:" << M << " N:" << N << " resamp_rate:" << resamp_rate << std::endl; |
| update(M, N); |
| d_resamp_rate = resamp_rate; |
| } |
| void update(uint64_t M, uint64_t N, time_spec_t ref_time){ |
| // std::cout << "M:" << M << " N:" << N << " ref_time" << ref_time.get_real_secs() << std::endl; |
| update(M, N); |
| d_ref_time = ref_time; |
| } |
| |
| void set_samp_rate(double samp_rate){ |
| d_samp_rate = samp_rate; |
| } |
| |
| uint64_t convert_M_to_N(uint64_t M){ |
| time_spec_t new_N_tspec = |
| time_spec_t::from_ticks(M - d_ref_offset, 1.0/d_resamp_rate) + |
| time_spec_t::from_ticks(d_original_ref_offset, 1.0); |
| uint64_t new_N = (round(new_N_tspec.get_real_secs())); |
| // std::cout << "d_ref_offset:" << d_ref_offset << " d_resamp_rate:" << d_resamp_rate << " d_ref_offset" << d_ref_offset << " d_original_ref_offset:" << d_original_ref_offset << std::endl; |
| return new_N; |
| } |
| |
| time_spec_t convert_M_to_t(uint64_t M){ |
| return time_spec_t::from_ticks(convert_M_to_N(M) - |
| d_original_ref_offset, d_samp_rate*d_resamp_rate) + d_ref_time; |
| } |
| |
| time_spec_t convert_M_to_ideal_t(uint64_t M){ |
| return time_spec_t::from_ticks(M, d_samp_rate); |
| } |
| |
| time_spec_t get_ref_time(){ |
| return d_ref_time; |
| } |
| |
| uint64_t convert_t_to_M(time_spec_t time) |
| { |
| uint64_t samples_since_ref_time_tag = (time-d_ref_time).to_ticks(d_samp_rate); |
| uint64_t offset = samples_since_ref_time_tag + d_ref_offset; |
| return offset; |
| } |
| |
| uint64_t convert_t_to_N(time_spec_t time) |
| { |
| return convert_M_to_N(convert_t_to_M(time)); |
| } |
| }; |
| } // namespace gsm |
| } // namespace gr |
| #endif// INCLUDED_TIME_SAMPLE_REF_IMPL_H |