conv_decoder.h

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/* -*- c++ -*- */
/*
 * gr-satnogs: SatNOGS GNU Radio Out-Of-Tree Module
 *
 *  Copyright (C) 2021, Libre Space Foundation <http://libre.space>
 *
 *  This program 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 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef INCLUDED_SATNOGS_CONV_DECODER_H
#define INCLUDED_SATNOGS_CONV_DECODER_H
 
#include <gnuradio/satnogs/api.h>
#include <cstddef>
#include <cstdint>
 
namespace gr {
namespace satnogs {
 
/*!
 * \brief SATNOGS compatible convolutional decoder with puncturing support
 *
 */
class SATNOGS_API conv_decoder
{
public:
    typedef enum { RATE_1_2 = 0, RATE_2_3, RATE_3_4, RATE_5_6, RATE_7_8 } coding_rate_t;
 
    conv_decoder(coding_rate_t coding_rate, size_t max_frame_len);
    virtual ~conv_decoder();
 
    void reset();
 
    size_t decode_trunc(uint8_t* out, const int8_t* in, size_t len);
 
    size_t decode(uint8_t* out, const int8_t* in, size_t len);
 
private:
    const coding_rate_t d_rate;
    size_t d_trunc_depth;
    size_t d_long_trunc_depth;
    uint8_t* d_syms;
    uint8_t* d_unpacked;
    bool d_first_block;
    void* d_vp;
    uint32_t d_last_state;
 
    size_t decode_block(uint8_t* out, const int8_t* in, size_t len);
 
    size_t decode_block_1_2(uint8_t* out, const int8_t* in, size_t len);
 
    size_t decode_block_2_3(uint8_t* out, const int8_t* in, size_t len);
 
    size_t decode_block_3_4(uint8_t* out, const int8_t* in, size_t len);
 
    size_t decode_block_5_6(uint8_t* out, const int8_t* in, size_t len);
 
    size_t decode_block_7_8(uint8_t* out, const int8_t* in, size_t len);
};
 
} // namespace satnogs
} // namespace gr
 
#endif /* INCLUDED_SATNOGS_CONV_DECODER_H */