114 lines
2.6 KiB
C++
114 lines
2.6 KiB
C++
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/* -*- c++ -*- */
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/*
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* gr-satnogs: SatNOGS GNU Radio Out-Of-Tree Module
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*
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* Copyright (C) 2018, Libre Space Foundation <http://librespacefoundation.org/>
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*
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* This program 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 of the License, or
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* (at your option) any later version.
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*
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* This program 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 program. If not, see <http://www.gnu.org/licenses/>.
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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 "lrpt_decoder_impl.h"
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#include <satnogs/log.h>
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#include <fec.h>
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namespace gr
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{
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namespace satnogs
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{
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lrpt_decoder::sptr
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lrpt_decoder::make ()
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{
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return gnuradio::get_initial_sptr (new lrpt_decoder_impl ());
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}
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/*
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* The private constructor
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*/
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lrpt_decoder_impl::lrpt_decoder_impl()
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: gr::block("lrpt_decoder",
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gr::io_signature::make(0, 0, 0),
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gr::io_signature::make(0, 0, 0)),
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d_cadu_len(1020),
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d_coded_cadu_len(1020 * 2),
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d_conv_deinterl(36, 2048)
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{
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message_port_register_in(pmt::mp("cadu"));
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message_port_register_in(pmt::mp("reset"));
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set_msg_handler (
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pmt::mp ("cadu"),
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boost::bind (&lrpt_decoder_impl::decode, this, _1));
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set_msg_handler (
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pmt::mp ("reset"),
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boost::bind (&lrpt_decoder_impl::reset, this, _1));
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d_vt = create_viterbi27(d_cadu_len * 8);
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if(!d_vt) {
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throw std::runtime_error("lrpt_decoder: Failed to init Viterbi decoder");
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}
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int polys[2] = {0x79, 0x5b};
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set_viterbi27_polynomial(polys);
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d_cadu = new uint8_t[d_cadu_len];
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d_coded_cadu_deinterl = new uint8_t[d_coded_cadu_len];
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}
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/*
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* Our virtual destructor.
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*/
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lrpt_decoder_impl::~lrpt_decoder_impl ()
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{
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delete [] d_cadu;
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delete [] d_coded_cadu_deinterl;
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}
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void
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lrpt_decoder_impl::decode (pmt::pmt_t m)
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{
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const uint8_t *coded_cadu = (const uint8_t *)pmt::blob_data(m);
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if(pmt::blob_length(m) != d_coded_cadu_len) {
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LOG_ERROR("Wrong CADU size");
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return;
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}
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for(size_t i = 0; i < d_coded_cadu_len; i++) {
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d_coded_cadu_deinterl[i] = d_conv_deinterl.decode_byte(coded_cadu[i]);
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}
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init_viterbi27(d_vt, 0);
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}
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void
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lrpt_decoder_impl::reset (pmt::pmt_t m)
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{
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if(pmt::to_bool(m)) {
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d_conv_deinterl.reset();
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}
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}
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} /* namespace satnogs */
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} /* namespace gr */
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