| /* -*- c++ -*- */ |
| /* @file |
| * @author (C) 2016 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 <gnuradio/io_signature.h> |
| #include "controlled_fractional_resampler_cc_impl.h" |
| #include <stdexcept> |
| |
| namespace gr { |
| namespace gsm { |
| |
| controlled_fractional_resampler_cc::sptr |
| controlled_fractional_resampler_cc::make(float phase_shift, float resamp_ratio) |
| { |
| return gnuradio::get_initial_sptr |
| (new controlled_fractional_resampler_cc_impl(phase_shift, resamp_ratio)); |
| } |
| |
| controlled_fractional_resampler_cc_impl::controlled_fractional_resampler_cc_impl |
| (float phase_shift, float resamp_ratio) |
| : block("controlled_fractional_resampler_cc", |
| io_signature::make(1, 1, sizeof(gr_complex)), |
| io_signature::make(1, 1, sizeof(gr_complex))), |
| d_mu(phase_shift), d_mu_inc(resamp_ratio), |
| d_resamp(new mmse_fir_interpolator_cc()) |
| { |
| this->set_tag_propagation_policy(TPP_DONT); |
| if(resamp_ratio <= 0) |
| throw std::out_of_range("resampling ratio must be > 0"); |
| if(phase_shift < 0 || phase_shift > 1) |
| throw std::out_of_range("phase shift ratio must be > 0 and < 1"); |
| |
| set_relative_rate(1.0 / resamp_ratio); |
| } |
| |
| controlled_fractional_resampler_cc_impl::~controlled_fractional_resampler_cc_impl() |
| { |
| delete d_resamp; |
| } |
| |
| void |
| controlled_fractional_resampler_cc_impl::forecast(int noutput_items, |
| gr_vector_int &ninput_items_required) |
| { |
| unsigned ninputs = ninput_items_required.size(); |
| for(unsigned i=0; i < ninputs; i++) { |
| ninput_items_required[i] = |
| (int)ceil((noutput_items * d_mu_inc) + d_resamp->ntaps()); |
| } |
| } |
| |
| int |
| controlled_fractional_resampler_cc_impl::general_work(int noutput_items, |
| gr_vector_int &ninput_items, |
| gr_vector_const_void_star &input_items, |
| gr_vector_void_star &output_items) |
| { |
| const gr_complex *in = (const gr_complex*)input_items[0]; |
| gr_complex *out = (gr_complex*)output_items[0]; |
| |
| uint64_t processed_in = 0; //input samples processed in the last call to resample function |
| uint64_t processed_in_sum = 0; //input samples processed during a whole call to general_work function |
| uint64_t produced_out_sum = 0; //output samples produced during a whole call to general_work function |
| |
| std::vector<tag_t> set_resamp_ratio_tags; |
| |
| pmt::pmt_t key = pmt::string_to_symbol("set_resamp_ratio"); |
| get_tags_in_window(set_resamp_ratio_tags, 0, 0, ninput_items[0]); |
| |
| bool all_output_samples_produced = false; |
| for(std::vector<tag_t>::iterator i_tag = set_resamp_ratio_tags.begin(); i_tag < set_resamp_ratio_tags.end(); i_tag++) |
| { |
| uint64_t tag_offset_rel = i_tag->offset - nitems_read(0); |
| |
| if(pmt::symbol_to_string(i_tag->key) == "set_resamp_ratio") |
| { |
| uint64_t samples_to_produce = static_cast<uint64_t>(round(static_cast<double>(tag_offset_rel-processed_in_sum)/d_mu_inc)); //tu może być problem - bo to jest głupota przy d_mu_inc różnym od 1.0 |
| |
| if( (samples_to_produce + produced_out_sum) > noutput_items) |
| { |
| samples_to_produce = noutput_items - produced_out_sum; |
| all_output_samples_produced = true; |
| } |
| |
| processed_in = resample(in, processed_in_sum, out, produced_out_sum, samples_to_produce); |
| processed_in_sum = processed_in_sum + processed_in; |
| produced_out_sum = produced_out_sum + samples_to_produce; |
| |
| if(all_output_samples_produced) |
| { |
| break; |
| } else { |
| add_item_tag(0, produced_out_sum + nitems_written(0), i_tag->key, i_tag->value); |
| set_resamp_ratio(pmt::to_double(i_tag->value)); |
| } |
| } else { |
| uint64_t out_samples_to_tag = round(static_cast<double>(tag_offset_rel-processed_in_sum)/d_mu_inc); |
| if( (out_samples_to_tag + produced_out_sum) <= noutput_items) |
| { |
| add_item_tag(0, produced_out_sum + out_samples_to_tag + nitems_written(0), i_tag->key, i_tag->value); |
| } |
| } |
| } |
| |
| if(!all_output_samples_produced) |
| { |
| processed_in = resample(in, processed_in_sum, out, produced_out_sum, (noutput_items-produced_out_sum)); |
| processed_in_sum = processed_in_sum + processed_in; |
| } |
| |
| consume_each(processed_in_sum); |
| return noutput_items; |
| } |
| |
| inline uint64_t |
| controlled_fractional_resampler_cc_impl::resample(const gr_complex *in, uint64_t first_in_sample, gr_complex *out, uint64_t first_out_sample, uint64_t samples_to_produce) |
| { |
| int ii = first_in_sample; |
| int oo = first_out_sample; |
| while(oo < (first_out_sample+samples_to_produce)) //produce samples_to_produce number of samples |
| { |
| out[oo++] = d_resamp->interpolate(&in[ii], d_mu); |
| |
| double s = d_mu + d_mu_inc; |
| double f = floor(s); |
| int incr = (int)f; |
| d_mu = s - f; |
| ii += incr; |
| } |
| return ii-first_in_sample; //number of input samples processed |
| } |
| |
| float |
| controlled_fractional_resampler_cc_impl::mu() const |
| { |
| return d_mu; |
| } |
| |
| float |
| controlled_fractional_resampler_cc_impl::resamp_ratio() const |
| { |
| return d_mu_inc; |
| } |
| |
| void |
| controlled_fractional_resampler_cc_impl::set_mu(float mu) |
| { |
| d_mu = mu; |
| } |
| |
| void |
| controlled_fractional_resampler_cc_impl::set_resamp_ratio(float resamp_ratio) |
| { |
| d_mu_inc = resamp_ratio; |
| set_relative_rate(1.0 / resamp_ratio); |
| } |
| |
| } /* namespace gsm */ |
| } /* namespace gr */ |
| |