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275 lines
6.1 KiB
275 lines
6.1 KiB
/*
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* Copyright (C) 2016,2017,2019 by Jonathan Naylor G4KLX
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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 2 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, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "YSFConvolution.h"
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#include "YSFDefines.h"
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#include "Golay24128.h"
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#include "YSFFICH.h"
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#include "CRC.h"
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#include "Log.h"
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#include <cstdio>
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#include <cassert>
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#include <cstring>
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const unsigned char BIT_MASK_TABLE[] = {0x80U, 0x40U, 0x20U, 0x10U, 0x08U, 0x04U, 0x02U, 0x01U};
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#define WRITE_BIT1(p,i,b) p[(i)>>3] = (b) ? (p[(i)>>3] | BIT_MASK_TABLE[(i)&7]) : (p[(i)>>3] & ~BIT_MASK_TABLE[(i)&7])
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#define READ_BIT1(p,i) (p[(i)>>3] & BIT_MASK_TABLE[(i)&7])
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const unsigned int INTERLEAVE_TABLE[] = {
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0U, 40U, 80U, 120U, 160U,
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2U, 42U, 82U, 122U, 162U,
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4U, 44U, 84U, 124U, 164U,
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6U, 46U, 86U, 126U, 166U,
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8U, 48U, 88U, 128U, 168U,
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10U, 50U, 90U, 130U, 170U,
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12U, 52U, 92U, 132U, 172U,
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14U, 54U, 94U, 134U, 174U,
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16U, 56U, 96U, 136U, 176U,
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18U, 58U, 98U, 138U, 178U,
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20U, 60U, 100U, 140U, 180U,
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22U, 62U, 102U, 142U, 182U,
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24U, 64U, 104U, 144U, 184U,
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26U, 66U, 106U, 146U, 186U,
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28U, 68U, 108U, 148U, 188U,
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30U, 70U, 110U, 150U, 190U,
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32U, 72U, 112U, 152U, 192U,
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34U, 74U, 114U, 154U, 194U,
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36U, 76U, 116U, 156U, 196U,
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38U, 78U, 118U, 158U, 198U};
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CYSFFICH::CYSFFICH(const CYSFFICH& fich) :
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m_fich(NULL)
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{
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m_fich = new unsigned char[6U];
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::memcpy(m_fich, fich.m_fich, 6U);
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}
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CYSFFICH::CYSFFICH() :
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m_fich(NULL)
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{
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m_fich = new unsigned char[6U];
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memset(m_fich, 0x00U, 6U);
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}
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CYSFFICH::~CYSFFICH()
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{
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delete[] m_fich;
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}
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bool CYSFFICH::decode(const unsigned char* bytes)
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{
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assert(bytes != NULL);
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// Skip the sync bytes
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bytes += YSF_SYNC_LENGTH_BYTES;
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CYSFConvolution viterbi;
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viterbi.start();
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// Deinterleave the FICH and send bits to the Viterbi decoder
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for (unsigned int i = 0U; i < 100U; i++) {
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unsigned int n = INTERLEAVE_TABLE[i];
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uint8_t s0 = READ_BIT1(bytes, n) ? 1U : 0U;
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n++;
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uint8_t s1 = READ_BIT1(bytes, n) ? 1U : 0U;
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viterbi.decode(s0, s1);
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}
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unsigned char output[13U];
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viterbi.chainback(output, 96U);
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unsigned int b0 = CGolay24128::decode24128(output + 0U);
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unsigned int b1 = CGolay24128::decode24128(output + 3U);
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unsigned int b2 = CGolay24128::decode24128(output + 6U);
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unsigned int b3 = CGolay24128::decode24128(output + 9U);
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m_fich[0U] = (b0 >> 4) & 0xFFU;
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m_fich[1U] = ((b0 << 4) & 0xF0U) | ((b1 >> 8) & 0x0FU);
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m_fich[2U] = (b1 >> 0) & 0xFFU;
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m_fich[3U] = (b2 >> 4) & 0xFFU;
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m_fich[4U] = ((b2 << 4) & 0xF0U) | ((b3 >> 8) & 0x0FU);
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m_fich[5U] = (b3 >> 0) & 0xFFU;
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return CCRC::checkCCITT16(m_fich, 6U);
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}
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void CYSFFICH::encode(unsigned char* bytes)
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{
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assert(bytes != NULL);
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// Skip the sync bytes
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bytes += YSF_SYNC_LENGTH_BYTES;
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CCRC::addCCITT16(m_fich, 6U);
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unsigned int b0 = ((m_fich[0U] << 4) & 0xFF0U) | ((m_fich[1U] >> 4) & 0x00FU);
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unsigned int b1 = ((m_fich[1U] << 8) & 0xF00U) | ((m_fich[2U] >> 0) & 0x0FFU);
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unsigned int b2 = ((m_fich[3U] << 4) & 0xFF0U) | ((m_fich[4U] >> 4) & 0x00FU);
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unsigned int b3 = ((m_fich[4U] << 8) & 0xF00U) | ((m_fich[5U] >> 0) & 0x0FFU);
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unsigned int c0 = CGolay24128::encode24128(b0);
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unsigned int c1 = CGolay24128::encode24128(b1);
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unsigned int c2 = CGolay24128::encode24128(b2);
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unsigned int c3 = CGolay24128::encode24128(b3);
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unsigned char conv[13U];
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conv[0U] = (c0 >> 16) & 0xFFU;
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conv[1U] = (c0 >> 8) & 0xFFU;
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conv[2U] = (c0 >> 0) & 0xFFU;
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conv[3U] = (c1 >> 16) & 0xFFU;
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conv[4U] = (c1 >> 8) & 0xFFU;
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conv[5U] = (c1 >> 0) & 0xFFU;
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conv[6U] = (c2 >> 16) & 0xFFU;
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conv[7U] = (c2 >> 8) & 0xFFU;
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conv[8U] = (c2 >> 0) & 0xFFU;
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conv[9U] = (c3 >> 16) & 0xFFU;
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conv[10U] = (c3 >> 8) & 0xFFU;
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conv[11U] = (c3 >> 0) & 0xFFU;
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conv[12U] = 0x00U;
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CYSFConvolution convolution;
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unsigned char convolved[25U];
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convolution.encode(conv, convolved, 100U);
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unsigned int j = 0U;
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for (unsigned int i = 0U; i < 100U; i++) {
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unsigned int n = INTERLEAVE_TABLE[i];
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bool s0 = READ_BIT1(convolved, j) != 0U;
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j++;
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bool s1 = READ_BIT1(convolved, j) != 0U;
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j++;
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WRITE_BIT1(bytes, n, s0);
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n++;
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WRITE_BIT1(bytes, n, s1);
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}
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}
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unsigned char CYSFFICH::getFI() const
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{
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return (m_fich[0U] >> 6) & 0x03U;
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}
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unsigned char CYSFFICH::getCM() const
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{
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return (m_fich[0U] >> 2) & 0x03U;
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}
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unsigned char CYSFFICH::getBN() const
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{
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return m_fich[0U] & 0x03U;
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}
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unsigned char CYSFFICH::getBT() const
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{
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return (m_fich[1U] >> 6) & 0x03U;
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}
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unsigned char CYSFFICH::getFN() const
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{
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return (m_fich[1U] >> 3) & 0x07U;
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}
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unsigned char CYSFFICH::getFT() const
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{
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return m_fich[1U] & 0x07U;
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}
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unsigned char CYSFFICH::getDT() const
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{
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return m_fich[2U] & 0x03U;
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}
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unsigned char CYSFFICH::getMR() const
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{
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return (m_fich[2U] >> 3) & 0x03U;
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}
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bool CYSFFICH::getDev() const
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{
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return (m_fich[2U] & 0x40U) == 0x40U;
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}
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unsigned char CYSFFICH::getDGId() const
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{
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return m_fich[3U] & 0x7FU;
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}
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void CYSFFICH::setFI(unsigned char fi)
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{
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m_fich[0U] &= 0x3FU;
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m_fich[0U] |= (fi << 6) & 0xC0U;
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}
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void CYSFFICH::setFN(unsigned char fn)
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{
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m_fich[1U] &= 0xC7U;
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m_fich[1U] |= (fn << 3) & 0x38U;
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}
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void CYSFFICH::setFT(unsigned char ft)
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{
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m_fich[1U] &= 0xF8U;
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m_fich[1U] |= ft & 0x07U;
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}
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void CYSFFICH::setMR(unsigned char mr)
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{
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m_fich[2U] &= 0xC7U;
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m_fich[2U] |= (mr << 3) & 0x38U;
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}
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void CYSFFICH::setVoIP(bool on)
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{
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if (on)
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m_fich[2U] |= 0x04U;
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else
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m_fich[2U] &= 0xFBU;
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}
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void CYSFFICH::setDev(bool on)
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{
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if (on)
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m_fich[2U] |= 0x40U;
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else
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m_fich[2U] &= 0xBFU;
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}
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void CYSFFICH::setDGId(unsigned char id)
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{
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m_fich[3U] &= 0x80U;
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m_fich[3U] |= id & 0x7FU;
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}
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CYSFFICH& CYSFFICH::operator=(const CYSFFICH& fich)
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{
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if (&fich != this)
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::memcpy(m_fich, fich.m_fich, 6U);
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return *this;
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}
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