kopia lustrzana https://github.com/OpenRTX/OpenRTX
Implementation of M17 code puncturing scheme
Silvano Seva
rodzic
d545071df6
commit
ee1b111fb7
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@ -18,8 +18,8 @@
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* along with this program; if not, see <http://www.gnu.org/licenses/> *
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***************************************************************************/
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#ifndef M17CALLSIGN_H
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#define M17CALLSIGN_H
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#ifndef M17_CALLSIGN_H
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#define M17_CALLSIGN_H
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#ifndef __cplusplus
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#error This header is C++ only!
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@ -52,4 +52,4 @@ bool encode_callsign(const std::string& callsign, call_t& encodedCall,
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*/
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std::string decode_callsign(const call_t& encodedCall);
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#endif /* M17CALLSIGN_H */
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#endif /* M17_CALLSIGN_H */
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@ -0,0 +1,90 @@
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/***************************************************************************
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* Copyright (C) 2021 by Federico Amedeo Izzo IU2NUO, *
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* Niccolò Izzo IU2KIN *
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* Frederik Saraci IU2NRO *
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* Silvano Seva IU2KWO *
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* *
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* Adapted from original code written by Rob Riggs, Mobilinkd LLC *
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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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#ifndef M17_CODE_PUNCTURING_H
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#define M17_CODE_PUNCTURING_H
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#ifndef __cplusplus
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#error This header is C++ only!
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#endif
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#include <experimental/array>
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#include "M17Utils.h"
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/**
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* Puncture matrix for linx setup frame.
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*/
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static constexpr auto LSF_puncture = std::experimental::make_array< uint8_t >
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(
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1, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0,
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1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 0,
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1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 1,
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0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1,
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0, 1, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1,
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1, 1, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 1
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);
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/**
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* Puncture matrix for audio frames.
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*/
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static constexpr auto Audio_puncture = std::experimental::make_array< uint8_t >
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(
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1, 1, 1, 1, 1, 1,
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1, 1, 1, 1, 1, 0
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);
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/**
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* Apply a given puncturing scheme to a byte array.
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*
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* \param input: input byte array.
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* \param output: output byte array, containing puntured data.
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* \param puncture: puncturing matrix, stored as an array of 8 bit values.
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* \return resulting bit count after punturing.
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*/
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template < size_t IN, size_t OUT, size_t P >
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size_t puncture(const std::array< uint8_t, IN >& input,
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std::array< uint8_t, OUT >& output,
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const std::array< uint8_t, P >& puncture)
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{
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size_t outIndex = 0;
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size_t punctIndex = 0;
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size_t bit_count = 0;
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for(size_t i = 0; i < 8*IN && outIndex < 8*OUT; i++)
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{
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if(puncture[punctIndex++])
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{
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setBit(output, outIndex++, getBit(input, i));
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bit_count++;
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}
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if(punctIndex == P) punctIndex = 0;
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}
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return bit_count;
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}
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#endif /* M17_CODE_PUNCTURING_H */
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@ -20,8 +20,8 @@
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* along with this program; if not, see <http://www.gnu.org/licenses/> *
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***************************************************************************/
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#ifndef M17CONVOLUTIONALENCODER_H
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#define M17CONVOLUTIONALENCODER_H
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#ifndef M17_CONVOLUTIONAL_ENCODER_H
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#define M17_CONVOLUTIONAL_ENCODER_H
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#ifndef __cplusplus
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#error This header is C++ only!
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@ -111,4 +111,4 @@ private:
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uint8_t memory = 0; ///< Convolutional encoder memory.
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};
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#endif /* M17CONVOLUTIONALENCODER_H */
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#endif /* M17_CONVOLUTIONAL_ENCODER_H */
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@ -18,8 +18,8 @@
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* along with this program; if not, see <http://www.gnu.org/licenses/> *
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***************************************************************************/
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#ifndef M17DATATYPES_H
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#define M17DATATYPES_H
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#ifndef M17_DATATYPES_H
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#define M17_DATATYPES_H
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#include <cstdint>
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#include <array>
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@ -75,4 +75,4 @@ typedef struct
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}
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__attribute__((packed)) dataFrame_t;
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#endif /* M17DATATYPES_H */
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#endif /* M17_DATATYPES_H */
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@ -18,8 +18,8 @@
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* along with this program; if not, see <http://www.gnu.org/licenses/> *
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***************************************************************************/
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#ifndef M17FRAME_H
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#define M17FRAME_H
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#ifndef M17_FRAME_H
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#define M17_FRAME_H
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#ifndef __cplusplus
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#error This header is C++ only!
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@ -115,4 +115,4 @@ private:
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dataFrame_t data; ///< Underlying frame data.
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};
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#endif /* M17FRAME_H */
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#endif /* M17_FRAME_H */
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@ -18,8 +18,8 @@
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* along with this program; if not, see <http://www.gnu.org/licenses/> *
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***************************************************************************/
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#ifndef M17LINKSETUPFRAME_H
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#define M17LINKSETUPFRAME_H
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#ifndef M17_LINKSETUPFRAME_H
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#define M17_LINKSETUPFRAME_H
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#ifndef __cplusplus
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#error This header is C++ only!
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@ -125,4 +125,4 @@ private:
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lsf_t data; ///< Underlying frame data.
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};
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#endif /* M17LINKSETUPFRAME_H */
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#endif /* M17_LINKSETUPFRAME_H */
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@ -0,0 +1,70 @@
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/***************************************************************************
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* Copyright (C) 2021 by Federico Amedeo Izzo IU2NUO, *
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* Niccolò Izzo IU2KIN *
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* Frederik Saraci IU2NRO *
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* Silvano Seva IU2KWO *
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* *
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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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#ifndef M17_UTILS_H
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#define M17_UTILS_H
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#ifndef __cplusplus
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#error This header is C++ only!
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#endif
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#include <array>
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/**
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* Utility function allowing to retrieve the value of a single bit from an array
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* of bytes. Bits are counted scanning from left to right, thus bit number zero
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* is the leftmost bit of array[0].
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*
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* \param array: byte array.
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* \param pos: bit position inside the array.
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* \return value of the indexed bit, as boolean variable.
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*/
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template < size_t N >
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inline bool getBit(const std::array< uint8_t, N >& array, const size_t pos)
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{
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size_t i = pos / 8;
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size_t j = pos % 8;
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return (array[i] >> (7 - j)) & 0x01;
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}
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/**
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* Utility function allowing to set the value of a single bit from an array
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* of bytes. Bits are counted scanning from left to right, thus bit number zero
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* is the leftmost bit of array[0].
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*
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* \param array: byte array.
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* \param pos: bit position inside the array.
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* \param bit: bit value to be set.
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*/
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template < size_t N >
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inline void setBit(std::array< uint8_t, N >& array, const size_t pos,
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const bool bit)
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{
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size_t i = pos / 8;
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size_t j = pos % 8;
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uint8_t mask = 1 << (7 - j);
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array[i] = (array[i] & ~mask) |
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(bit ? mask : 0x00);
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}
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#endif /* M17_UTILS_H */
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