108 lines
3.1 KiB
C++
108 lines
3.1 KiB
C++
/* -*- c++ -*- */
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/*
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* Copyright 2019 Thomas Kolb.
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*
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* This 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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* This software 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 this software; 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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <gnuradio/io_signature.h>
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#include "insert_pilot_symbols_impl.h"
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namespace gr {
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namespace hamnet70 {
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insert_pilot_symbols::sptr
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insert_pilot_symbols::make(const std::vector<gr_complex> &pilot_sequence, const std::vector<size_t> &offsets, const std::string &length_tag)
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{
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return gnuradio::get_initial_sptr
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(new insert_pilot_symbols_impl(pilot_sequence, offsets, length_tag));
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}
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/*
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* The private constructor
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*/
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insert_pilot_symbols_impl::insert_pilot_symbols_impl(const std::vector<gr_complex> &pilot_sequence, const std::vector<size_t> &offsets, const std::string &length_tag)
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: gr::tagged_stream_block("insert_pilot_symbols",
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gr::io_signature::make(1, 1, sizeof(gr_complex)),
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gr::io_signature::make(1, 1, sizeof(gr_complex)), length_tag),
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d_pilot_sequence(pilot_sequence),
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d_offsets(offsets)
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{}
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/*
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* Our virtual destructor.
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*/
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insert_pilot_symbols_impl::~insert_pilot_symbols_impl()
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{
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}
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int
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insert_pilot_symbols_impl::calculate_output_stream_length(const gr_vector_int &ninput_items)
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{
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int noutput_items = ninput_items[0] + d_pilot_sequence.size() * d_offsets.size();
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return noutput_items ;
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}
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int
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insert_pilot_symbols_impl::work (int noutput_items,
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gr_vector_int &ninput_items,
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gr_vector_const_void_star &input_items,
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gr_vector_void_star &output_items)
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{
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const gr_complex *in = (const gr_complex *) input_items[0];
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gr_complex *out = (gr_complex *) output_items[0];
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size_t in_pos = 0;
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size_t out_pos = 0;
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size_t offset_idx = 0;
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size_t cur_offset = d_offsets[0];
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while(in_pos < ninput_items[0] && out_pos < noutput_items) {
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if(in_pos == cur_offset) {
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// insert preamble before cur_offset
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for(const gr_complex &v : d_pilot_sequence) {
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out[out_pos++] = v;
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}
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offset_idx++;
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if(offset_idx >= d_offsets.size()) {
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// end of list reached => set to 0, which will never be valid
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// again for this packet
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cur_offset = 0;
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} else {
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cur_offset = d_offsets[offset_idx];
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}
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}
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// copy input packet symbol
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out[out_pos] = in[in_pos];
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out_pos++;
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in_pos++;
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}
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// Tell runtime system how many output items we produced.
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return out_pos;
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}
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} /* namespace hamnet70 */
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} /* namespace gr */
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