2023-09-06 10:21:22 -04:00
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///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2023 Jon Beniston, M7RCE //
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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 <QDebug>
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#include "psk31.h"
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// ASCII varicode encoding
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// From http://www.aintel.bi.ehu.es/psk31.html
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const QStringList PSK31Varicode::m_varicode = {
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"1010101011",
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"1011011011",
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"1011101101",
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"1101110111",
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"1011101011",
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"1101011111",
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"1011101111",
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"1011111101",
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"1011111111",
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"11101111",
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"11101",
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"1101101111",
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"1011011101",
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"11111",
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"1101110101",
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"1110101011",
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"1011110111",
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"1011110101",
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"1110101101",
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"1110101111",
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"1101011011",
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"1101101011",
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"1101101101",
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"1101010111",
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"1101111011",
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"1101111101",
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"1110110111",
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"1101010101",
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"1101011101",
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"1110111011",
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"1011111011",
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"1101111111",
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"1",
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"111111111",
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"101011111",
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"111110101",
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"111011011",
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"1011010101",
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"1010111011",
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"101111111",
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"11111011",
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"11110111",
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"101101111",
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"111011111",
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"1110101",
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"110101",
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"1010111",
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"110101111",
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"10110111",
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"10111101",
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"11101101",
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"11111111",
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"101110111",
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"101011011",
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"101101011",
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"110101101",
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"110101011",
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"110110111",
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"11110101",
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"110111101",
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"111101101",
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"1010101",
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"111010111",
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"1010101111",
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"1010111101",
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"1111101",
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"11101011",
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"10101101",
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"10110101",
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"1110111",
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"11011011",
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"11111101",
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"101010101",
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"1111111",
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"111111101",
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"101111101",
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"11010111",
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"10111011",
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"11011101",
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"10101011",
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"11010101",
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"111011101",
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"10101111",
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"1101111",
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"1101101",
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"101010111",
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"110110101",
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"101011101",
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"101110101",
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"101111011",
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"1010101101",
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"111110111",
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"111101111",
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"111111011",
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"1010111111",
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"101101101",
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"1011011111",
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"1011",
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"1011111",
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"101111",
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"101101",
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"11",
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"111101",
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"1011011",
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"101011",
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"1101",
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"111101011",
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"10111111",
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"11011",
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"111011",
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"1111",
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"111",
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"111111",
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"110111111",
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"10101",
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"10111",
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"101",
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"110111",
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"1111011",
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"1101011",
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"11011111",
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"1011101",
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"111010101",
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"1010110111",
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"110111011",
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"1010110101",
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"1011010111",
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"1110110101",
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};
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PSK31Encoder::PSK31Encoder()
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{
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}
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bool PSK31Encoder::encode(QChar c, unsigned &bits, unsigned int &bitCount)
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{
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bits = 0;
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bitCount = 0;
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char ch = c.toLatin1() & 0x7f;
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QString code = PSK31Varicode::m_varicode[ch];
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// FIXME: http://det.bi.ehu.es/~jtpjatae/pdf/p31g3plx.pdf > 128
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addCode(bits, bitCount, code);
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qDebug() << "Encoding " << c << "as" << code << bits << bitCount;
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return true;
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}
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void PSK31Encoder::addCode(unsigned& bits, unsigned int& bitCount, const QString& code) const
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{
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int codeBits = 0;
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unsigned int codeLen = code.size();
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2023-09-06 10:48:52 -04:00
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for (unsigned int i = 0; i < codeLen; i++) {
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2023-09-06 10:21:22 -04:00
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codeBits |= (code[i] == "1" ? 1 : 0) << i;
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}
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addStartBits(bits, bitCount);
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addBits(bits, bitCount, codeBits, codeLen);
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addStopBits(bits, bitCount);
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}
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void PSK31Encoder::addStartBits(unsigned& bits, unsigned int& bitCount) const
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{
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// Start bit is 0
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addBits(bits, bitCount, 0, 1);
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}
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void PSK31Encoder::addStopBits(unsigned& bits, unsigned int& bitCount) const
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{
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// Stop bit is 1
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addBits(bits, bitCount, 0, 1);
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}
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void PSK31Encoder::addBits(unsigned& bits, unsigned int& bitCount, int data, int count) const
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{
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bits |= data << bitCount;
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bitCount += count;
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}
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