mirror of https://github.com/f4exb/sdrangel.git
112 lines
4.3 KiB
C++
112 lines
4.3 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2024 Edouard Griffiths, F4EXB <f4exb06@gmail.com> //
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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 as 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 V3 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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#include "chirpchatdemodsettings.h"
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#include "chirpchatdemoddecoderft.h"
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#ifndef HAS_FT8
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void ChirpChatDemodDecoderFT::decodeSymbols(
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const std::vector<std::vector<float>>& mags, // vector of symbols magnitudes
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int nbSymbolBits, //!< number of bits per symbol
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QString& msg, //!< formatted message
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QString& call1, //!< 1st callsign or shorthand
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QString& call2, //!< 2nd callsign
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QString& loc, //!< locator, report or shorthand
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bool& reply //!< true if message is a reply report
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)
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{
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qWarning("ChirpChatDemodDecoderFT::decodeSymbols: not implemented");
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}
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#else
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#include "ft8.h"
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#include "packing.h"
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void ChirpChatDemodDecoderFT::decodeSymbols(
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const std::vector<std::vector<float>>& mags, // vector of symbols magnitudes
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int nbSymbolBits, //!< number of bits per symbol
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std::string& msg, //!< formatted message
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std::string& call1, //!< 1st callsign or shorthand
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std::string& call2, //!< 2nd callsign
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std::string& loc, //!< locator, report or shorthand
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bool& reply, //!< true if message is a reply report
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int& payloadParityStatus,
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bool& payloadCRCStatus
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)
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{
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if (mags.size()*nbSymbolBits < 174)
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{
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qWarning("ChirpChatDemodDecoderFT::decodeSymbols: insufficient number of symbols for FT payload");
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return;
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}
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float *lls = new float[mags.size()*nbSymbolBits]; // bits log likelihoods (>0 for 0, <0 for 1)
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std::fill(lls, lls+mags.size()*nbSymbolBits, 0.0);
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FT8::FT8Params params;
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FT8::FT8::soft_decode_mags(params, mags, nbSymbolBits, lls);
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int r174[174];
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std::string comments;
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payloadParityStatus = (int) ChirpChatDemodSettings::ParityOK;
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payloadCRCStatus = false;
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if (FT8::FT8::decode(lls, r174, params, 0, comments) == 0)
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{
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if (comments == "LDPC fail")
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{
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qWarning("ChirpChatDemodDecoderFT::decodeSymbols: LDPC failed");
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payloadParityStatus = (int) ChirpChatDemodSettings::ParityError;
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}
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else if (comments == "OSD fail")
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{
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qWarning("ChirpChatDemodDecoderFT::decodeSymbols: OSD failed");
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payloadParityStatus = (int) ChirpChatDemodSettings::ParityError;
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}
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else if (comments == "CRC fail")
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{
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qWarning("ChirpChatDemodDecoderFT::decodeSymbols: CRC failed");
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}
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else
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{
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qWarning("ChirpChatDemodDecoderFT::decodeSymbols: decode failed for unknown reason");
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payloadParityStatus = (int) ChirpChatDemodSettings::ParityUndefined;
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}
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return;
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}
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payloadCRCStatus = true;
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FT8::Packing packing;
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std::string msgType;
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msg = packing.unpack(r174, call1, call2, loc, msgType);
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reply = false;
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if ((msgType == "0.3") || (msgType == "0.3")) {
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reply = r174[56] != 0;
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}
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if ((msgType == "1") || (msgType == "2")) {
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reply = r174[58] != 0;
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}
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if ((msgType == "3")) {
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reply = r174[57] != 0;
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}
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if ((msgType == "5")) {
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reply = r174[34] != 0;
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}
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}
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#endif // HAS_FT8
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