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271 lines
8.0 KiB
271 lines
8.0 KiB
/**
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* Digital Voice Modem - Host Software
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* GPLv2 Open Source. Use is subject to license terms.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* @package DVM / Host Software
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*
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*/
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//
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// Based on code from the MMDVMHost project. (https://github.com/g4klx/MMDVMHost)
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// Licensed under the GPLv2 License (https://opensource.org/licenses/GPL-2.0)
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//
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/*
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* Copyright (C) 2018 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 "nxdn/channel/FACCH1.h"
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#include "nxdn/edac/Convolution.h"
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#include "nxdn/NXDNDefines.h"
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#include "edac/CRC.h"
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#include "Log.h"
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#include "Utils.h"
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using namespace nxdn;
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using namespace nxdn::channel;
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#include <cstdio>
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#include <cassert>
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#include <cstring>
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// ---------------------------------------------------------------------------
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// Constants
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// ---------------------------------------------------------------------------
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const uint32_t INTERLEAVE_TABLE[] = {
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0U, 9U, 18U, 27U, 36U, 45U, 54U, 63U, 72U, 81U, 90U, 99U, 108U, 117U, 126U, 135U,
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1U, 10U, 19U, 28U, 37U, 46U, 55U, 64U, 73U, 82U, 91U, 100U, 109U, 118U, 127U, 136U,
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2U, 11U, 20U, 29U, 38U, 47U, 56U, 65U, 74U, 83U, 92U, 101U, 110U, 119U, 128U, 137U,
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3U, 12U, 21U, 30U, 39U, 48U, 57U, 66U, 75U, 84U, 93U, 102U, 111U, 120U, 129U, 138U,
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4U, 13U, 22U, 31U, 40U, 49U, 58U, 67U, 76U, 85U, 94U, 103U, 112U, 121U, 130U, 139U,
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5U, 14U, 23U, 32U, 41U, 50U, 59U, 68U, 77U, 86U, 95U, 104U, 113U, 122U, 131U, 140U,
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6U, 15U, 24U, 33U, 42U, 51U, 60U, 69U, 78U, 87U, 96U, 105U, 114U, 123U, 132U, 141U,
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7U, 16U, 25U, 34U, 43U, 52U, 61U, 70U, 79U, 88U, 97U, 106U, 115U, 124U, 133U, 142U,
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8U, 17U, 26U, 35U, 44U, 53U, 62U, 71U, 80U, 89U, 98U, 107U, 116U, 125U, 134U, 143U };
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const uint32_t PUNCTURE_LIST[] = {
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1U, 5U, 9U, 13U, 17U, 21U, 25U, 29U, 33U, 37U,
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41U, 45U, 49U, 53U, 57U, 61U, 65U, 69U, 73U, 77U,
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81U, 85U, 89U, 93U, 97U, 101U, 105U, 109U, 113U, 117U,
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121U, 125U, 129U, 133U, 137U, 141U, 145U, 149U, 153U, 157U,
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161U, 165U, 169U, 173U, 177U, 181U, 185U, 189U };
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// ---------------------------------------------------------------------------
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// Public Class Members
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// ---------------------------------------------------------------------------
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/// <summary>
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/// Initializes a new instance of the FACCH1 class.
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/// </summary>
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FACCH1::FACCH1() :
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m_data(nullptr)
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{
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m_data = new uint8_t[NXDN_FACCH1_CRC_LENGTH_BYTES];
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::memset(m_data, 0x00U, NXDN_FACCH1_CRC_LENGTH_BYTES);
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}
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/// <summary>
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/// Initializes a copy instance of the FACCH1 class.
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/// </summary>
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/// <param name="data"></param>
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FACCH1::FACCH1(const FACCH1& data) :
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m_data(nullptr)
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{
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copy(data);
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}
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/// <summary>
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/// Finalizes a instance of FACCH1 class.
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/// </summary>
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FACCH1::~FACCH1()
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{
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delete[] m_data;
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}
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/// <summary>
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/// Equals operator.
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/// </summary>
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/// <param name="data"></param>
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/// <returns></returns>
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FACCH1& FACCH1::operator=(const FACCH1& data)
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{
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if (&data != this) {
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::memcpy(m_data, data.m_data, NXDN_FACCH1_CRC_LENGTH_BYTES);
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}
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return *this;
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}
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/// <summary>
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/// Decode a fast associated control channel 1.
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/// </summary>
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/// <param name="data"></param>
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/// <returns>True, if FACCH1 was decoded, otherwise false.</returns>
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bool FACCH1::decode(const uint8_t* data, uint32_t offset)
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{
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assert(data != nullptr);
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uint8_t buffer[NXDN_FACCH1_FEC_LENGTH_BYTES];
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::memset(buffer, 0x00U, NXDN_FACCH1_FEC_LENGTH_BYTES);
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// deinterleave
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for (uint32_t i = 0U; i < NXDN_FACCH1_FEC_LENGTH_BITS; i++) {
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uint32_t n = INTERLEAVE_TABLE[i] + offset;
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bool b = READ_BIT(data, n);
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WRITE_BIT(buffer, i, b);
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}
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#if DEBUG_NXDN_FACCH1
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Utils::dump(2U, "FACCH1::decode(), FACCH1 Raw", buffer, NXDN_FACCH1_FEC_LENGTH_BYTES);
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#endif
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// depuncture
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uint8_t puncture[210U];
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uint32_t n = 0U, index = 0U;
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for (uint32_t i = 0U; i < NXDN_FACCH1_FEC_LENGTH_BITS; i++) {
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if (n == PUNCTURE_LIST[index]) {
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puncture[n++] = 1U;
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index++;
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}
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bool b = READ_BIT(buffer, i);
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puncture[n++] = b ? 2U : 0U;
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}
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for (uint32_t i = 0U; i < 8U; i++) {
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puncture[n++] = 0U;
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}
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// decode convolution
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edac::Convolution conv;
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conv.start();
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n = 0U;
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for (uint32_t i = 0U; i < (NXDN_FACCH1_CRC_LENGTH_BITS + 4U); i++) {
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uint8_t s0 = puncture[n++];
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uint8_t s1 = puncture[n++];
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if (!conv.decode(s0, s1)) {
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LogError(LOG_NXDN, "FACCH1::decode(), failed to decode convolution");
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return false;
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}
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}
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conv.chainback(m_data, NXDN_FACCH1_CRC_LENGTH_BITS);
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#if DEBUG_NXDN_FACCH1
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Utils::dump(2U, "Decoded FACCH1", m_data, NXDN_FACCH1_CRC_LENGTH_BYTES);
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#endif
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// check CRC-12
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bool ret = edac::CRC::checkCRC12(m_data, NXDN_FACCH1_LENGTH_BITS);
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if (!ret) {
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LogError(LOG_NXDN, "FACCH1::decode(), failed CRC-12 check");
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return false;
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}
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return true;
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}
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/// <summary>
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/// Encode a fast associated control channel 1.
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/// </summary>
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/// <param name="data"></param>
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/// <returns>True, if LICH was decoded, otherwise false.</returns>
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void FACCH1::encode(uint8_t* data, uint32_t offset) const
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{
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assert(data != nullptr);
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uint8_t buffer[NXDN_FACCH1_CRC_LENGTH_BYTES];
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::memset(buffer, 0x00U, NXDN_FACCH1_CRC_LENGTH_BYTES);
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::memcpy(buffer, m_data, NXDN_FACCH1_CRC_LENGTH_BYTES - 2U);
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edac::CRC::addCRC12(buffer, NXDN_FACCH1_LENGTH_BITS);
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#if DEBUG_NXDN_FACCH1
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Utils::dump(2U, "Encoded FACCH1", buffer, NXDN_FACCH1_CRC_LENGTH_BYTES);
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#endif
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// encode convolution
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uint8_t convolution[NXDN_FACCH1_FEC_CONV_LENGTH_BYTES];
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::memset(convolution, 0x00U, NXDN_FACCH1_FEC_CONV_LENGTH_BYTES);
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edac::Convolution conv;
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conv.encode(buffer, convolution, NXDN_FACCH1_CRC_LENGTH_BITS);
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// puncture
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uint8_t puncture[NXDN_FACCH1_FEC_LENGTH_BYTES];
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::memset(puncture, 0x00U, NXDN_FACCH1_FEC_LENGTH_BYTES);
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uint32_t n = 0U, index = 0U;
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for (uint32_t i = 0U; i < NXDN_FACCH1_FEC_CONV_LENGTH_BITS; i++) {
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if (i != PUNCTURE_LIST[index]) {
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bool b = READ_BIT(convolution, i);
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WRITE_BIT(puncture, n, b);
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n++;
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} else {
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index++;
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}
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}
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// interleave
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for (uint32_t i = 0U; i < NXDN_FACCH1_FEC_LENGTH_BITS; i++) {
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uint32_t n = INTERLEAVE_TABLE[i] + offset;
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bool b = READ_BIT(puncture, i);
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WRITE_BIT(data, n, b);
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}
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#if DEBUG_NXDN_SACCH
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Utils::dump(2U, "FACCH1::encode(), FACCH1 Puncture and Interleave", data, NXDN_FACCH1_FEC_LENGTH_BYTES);
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#endif
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}
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/// <summary>
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/// Gets the raw FACCH1 data.
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/// </summary>
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/// <param name="data"></param>
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void FACCH1::getData(uint8_t* data) const
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{
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assert(data != nullptr);
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::memcpy(data, m_data, NXDN_FACCH1_CRC_LENGTH_BYTES - 2U);
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}
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/// <summary>
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/// Sets the raw FACCH1 data.
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/// </summary>
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/// <param name="data"></param>
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void FACCH1::setData(const uint8_t* data)
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{
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assert(data != nullptr);
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::memcpy(m_data, data, NXDN_FACCH1_CRC_LENGTH_BYTES - 2U);
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}
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// ---------------------------------------------------------------------------
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// Private Class Members
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// ---------------------------------------------------------------------------
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/// <summary>
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/// Internal helper to copy the the class.
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/// </summary>
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/// <param name="data"></param>
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void FACCH1::copy(const FACCH1& data)
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{
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m_data = new uint8_t[NXDN_FACCH1_CRC_LENGTH_BYTES];
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::memcpy(m_data, data.m_data, NXDN_FACCH1_CRC_LENGTH_BYTES);
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}
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