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/* -*- c++ -*- */
/*
* Copyright 2021 Daniel Estevez <daniel@destevez.net>
*
* This file is part of gr-satellites
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "viterbi_decoder_impl.h"
#include <gnuradio/io_signature.h>
#include <string>
#include <vector>
namespace gr {
namespace satellites {
viterbi_decoder::sptr viterbi_decoder::make(int constraint,
const std::vector<int>& polynomials)
{
return gnuradio::make_block_sptr<viterbi_decoder_impl>(constraint, polynomials);
}
/*
* The private constructor
*/
viterbi_decoder_impl::viterbi_decoder_impl(int constraint,
const std::vector<int>& polynomials)
: gr::block("viterbi_decoder",
gr::io_signature::make(0, 0, 0),
gr::io_signature::make(0, 0, 0)),
d_codec(constraint, polynomials)
{
message_port_register_out(pmt::mp("out"));
message_port_register_in(pmt::mp("in"));
set_msg_handler(pmt::mp("in"), [this](pmt::pmt_t msg) { this->msg_handler(msg); });
}
/*
* Our virtual destructor.
*/
viterbi_decoder_impl::~viterbi_decoder_impl() {}
int viterbi_decoder_impl::general_work(int noutput_items,
gr_vector_int& ninput_items,
gr_vector_const_void_star& input_items,
gr_vector_void_star& output_items)
{
return 0;
}
void viterbi_decoder_impl::msg_handler(pmt::pmt_t pmt_msg)
{
std::vector<uint8_t> msg = pmt::u8vector_elements(pmt::cdr(pmt_msg));
std::string bits;
for (auto b : msg) {
bits.push_back(b ? '1' : '0');
}
std::string outbits = d_codec.Decode(bits);
std::vector<uint8_t> out;
for (auto b : outbits) {
out.push_back(b == '1');
}
message_port_pub(pmt::mp("out"),
pmt::cons(pmt::car(pmt_msg), pmt::init_u8vector(out.size(), out)));
return;
}
} /* namespace satellites */
} /* namespace gr */
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