You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
290 lines
7.5 KiB
290 lines
7.5 KiB
/**
|
|
* Digital Voice Modem - Host Software
|
|
* GPLv2 Open Source. Use is subject to license terms.
|
|
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
|
|
*
|
|
* @package DVM / Host Software
|
|
*
|
|
*/
|
|
//
|
|
// Based on code from the MMDVMHost project. (https://github.com/g4klx/MMDVMHost)
|
|
// Licensed under the GPLv2 License (https://opensource.org/licenses/GPL-2.0)
|
|
//
|
|
/*
|
|
* Copyright (C) 2015,2016 by Jonathan Naylor G4KLX
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
#include "Defines.h"
|
|
#include "dmr/lc/ShortLC.h"
|
|
#include "edac/Hamming.h"
|
|
#include "Utils.h"
|
|
|
|
using namespace dmr::lc;
|
|
using namespace dmr;
|
|
|
|
#include <cstdio>
|
|
#include <cassert>
|
|
#include <cstring>
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// Public Class Members
|
|
// ---------------------------------------------------------------------------
|
|
|
|
/// <summary>
|
|
/// Initializes a new instance of the ShortLC class.
|
|
/// </summary>
|
|
ShortLC::ShortLC() :
|
|
m_rawData(NULL),
|
|
m_deInterData(NULL)
|
|
{
|
|
m_rawData = new bool[72U];
|
|
m_deInterData = new bool[68U];
|
|
}
|
|
|
|
/// <summary>
|
|
/// Finalizes a instance of the ShortLC class.
|
|
/// </summary>
|
|
ShortLC::~ShortLC()
|
|
{
|
|
delete[] m_rawData;
|
|
delete[] m_deInterData;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Decode DMR short-link control data.
|
|
/// </summary>
|
|
/// <param name="in"></param>
|
|
/// <param name="out"></param>
|
|
/// <returns></returns>
|
|
bool ShortLC::decode(const uint8_t* in, uint8_t* out)
|
|
{
|
|
assert(in != NULL);
|
|
assert(out != NULL);
|
|
|
|
// Get the raw binary
|
|
decodeExtractBinary(in);
|
|
|
|
// Deinterleave
|
|
decodeDeInterleave();
|
|
|
|
// Error check
|
|
bool ret = decodeErrorCheck();
|
|
if (!ret)
|
|
return false;
|
|
|
|
// Extract Data
|
|
decodeExtractData(out);
|
|
|
|
return true;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Encode DMR short-link control data.
|
|
/// </summary>
|
|
/// <param name="in"></param>
|
|
/// <param name="out"></param>
|
|
void ShortLC::encode(const uint8_t* in, uint8_t* out)
|
|
{
|
|
assert(in != NULL);
|
|
assert(out != NULL);
|
|
|
|
// Extract Data
|
|
encodeExtractData(in);
|
|
|
|
// Error check
|
|
encodeErrorCheck();
|
|
|
|
// Deinterleave
|
|
encodeInterleave();
|
|
|
|
// Get the raw binary
|
|
encodeExtractBinary(out);
|
|
}
|
|
|
|
// ---------------------------------------------------------------------------
|
|
// Private Class Members
|
|
// ---------------------------------------------------------------------------
|
|
|
|
/// <summary>
|
|
///
|
|
/// </summary>
|
|
/// <param name="in"></param>
|
|
void ShortLC::decodeExtractBinary(const uint8_t* in)
|
|
{
|
|
assert(in != NULL);
|
|
|
|
Utils::byteToBitsBE(in[0U], m_rawData + 0U);
|
|
Utils::byteToBitsBE(in[1U], m_rawData + 8U);
|
|
Utils::byteToBitsBE(in[2U], m_rawData + 16U);
|
|
Utils::byteToBitsBE(in[3U], m_rawData + 24U);
|
|
Utils::byteToBitsBE(in[4U], m_rawData + 32U);
|
|
Utils::byteToBitsBE(in[5U], m_rawData + 40U);
|
|
Utils::byteToBitsBE(in[6U], m_rawData + 48U);
|
|
Utils::byteToBitsBE(in[7U], m_rawData + 56U);
|
|
Utils::byteToBitsBE(in[8U], m_rawData + 64U);
|
|
}
|
|
|
|
/// <summary>
|
|
///
|
|
/// </summary>
|
|
void ShortLC::decodeDeInterleave()
|
|
{
|
|
for (uint32_t i = 0U; i < 68U; i++)
|
|
m_deInterData[i] = false;
|
|
|
|
for (uint32_t a = 0U; a < 67U; a++) {
|
|
// Calculate the interleave sequence
|
|
uint32_t interleaveSequence = (a * 4U) % 67U;
|
|
// Shuffle the data
|
|
m_deInterData[a] = m_rawData[interleaveSequence];
|
|
}
|
|
|
|
m_deInterData[67U] = m_rawData[67U];
|
|
}
|
|
|
|
/// <summary>
|
|
///
|
|
/// </summary>
|
|
/// <returns></returns>
|
|
bool ShortLC::decodeErrorCheck()
|
|
{
|
|
// Run through each of the 3 rows containing data
|
|
edac::Hamming::decode17123(m_deInterData + 0U);
|
|
edac::Hamming::decode17123(m_deInterData + 17U);
|
|
edac::Hamming::decode17123(m_deInterData + 34U);
|
|
|
|
// Run through each of the 17 columns
|
|
for (uint32_t c = 0U; c < 17U; c++) {
|
|
bool bit = m_deInterData[c + 0U] ^ m_deInterData[c + 17U] ^ m_deInterData[c + 34U];
|
|
if (bit != m_deInterData[c + 51U])
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/// <summary>
|
|
///
|
|
/// </summary>
|
|
/// <param name="data"></param>
|
|
void ShortLC::decodeExtractData(uint8_t* data) const
|
|
{
|
|
assert(data != NULL);
|
|
|
|
bool bData[40U];
|
|
|
|
for (uint32_t i = 0U; i < 40U; i++)
|
|
bData[i] = false;
|
|
|
|
uint32_t pos = 4U;
|
|
for (uint32_t a = 0U; a < 12U; a++, pos++)
|
|
bData[pos] = m_deInterData[a];
|
|
|
|
for (uint32_t a = 17U; a < 29U; a++, pos++)
|
|
bData[pos] = m_deInterData[a];
|
|
|
|
for (uint32_t a = 34U; a < 46U; a++, pos++)
|
|
bData[pos] = m_deInterData[a];
|
|
|
|
Utils::bitsToByteBE(bData + 0U, data[0U]);
|
|
Utils::bitsToByteBE(bData + 8U, data[1U]);
|
|
Utils::bitsToByteBE(bData + 16U, data[2U]);
|
|
Utils::bitsToByteBE(bData + 24U, data[3U]);
|
|
Utils::bitsToByteBE(bData + 32U, data[4U]);
|
|
}
|
|
|
|
/// <summary>
|
|
///
|
|
/// </summary>
|
|
/// <param name="in"></param>
|
|
void ShortLC::encodeExtractData(const uint8_t* in) const
|
|
{
|
|
assert(in != NULL);
|
|
|
|
bool bData[40U];
|
|
Utils::byteToBitsBE(in[0U], bData + 0U);
|
|
Utils::byteToBitsBE(in[1U], bData + 8U);
|
|
Utils::byteToBitsBE(in[2U], bData + 16U);
|
|
Utils::byteToBitsBE(in[3U], bData + 24U);
|
|
Utils::byteToBitsBE(in[4U], bData + 32U);
|
|
|
|
for (uint32_t i = 0U; i < 68U; i++)
|
|
m_deInterData[i] = false;
|
|
|
|
uint32_t pos = 4U;
|
|
for (uint32_t a = 0U; a < 12U; a++, pos++)
|
|
m_deInterData[a] = bData[pos];
|
|
|
|
for (uint32_t a = 17U; a < 29U; a++, pos++)
|
|
m_deInterData[a] = bData[pos];
|
|
|
|
for (uint32_t a = 34U; a < 46U; a++, pos++)
|
|
m_deInterData[a] = bData[pos];
|
|
}
|
|
|
|
/// <summary>
|
|
///
|
|
/// </summary>
|
|
void ShortLC::encodeErrorCheck()
|
|
{
|
|
// Run through each of the 3 rows containing data
|
|
edac::Hamming::encode17123(m_deInterData + 0U);
|
|
edac::Hamming::encode17123(m_deInterData + 17U);
|
|
edac::Hamming::encode17123(m_deInterData + 34U);
|
|
|
|
// Run through each of the 17 columns
|
|
for (uint32_t c = 0U; c < 17U; c++)
|
|
m_deInterData[c + 51U] = m_deInterData[c + 0U] ^ m_deInterData[c + 17U] ^ m_deInterData[c + 34U];
|
|
}
|
|
|
|
/// <summary>
|
|
///
|
|
/// </summary>
|
|
void ShortLC::encodeInterleave()
|
|
{
|
|
for (uint32_t i = 0U; i < 72U; i++)
|
|
m_rawData[i] = false;
|
|
|
|
for (uint32_t a = 0U; a < 67U; a++) {
|
|
// Calculate the interleave sequence
|
|
uint32_t interleaveSequence = (a * 4U) % 67U;
|
|
|
|
// Unshuffle the data
|
|
m_rawData[interleaveSequence] = m_deInterData[a];
|
|
}
|
|
|
|
m_rawData[67U] = m_deInterData[67U];
|
|
}
|
|
|
|
/// <summary>
|
|
///
|
|
/// </summary>
|
|
/// <param name="data"></param>
|
|
void ShortLC::encodeExtractBinary(uint8_t* data)
|
|
{
|
|
assert(data != NULL);
|
|
|
|
Utils::bitsToByteBE(m_rawData + 0U, data[0U]);
|
|
Utils::bitsToByteBE(m_rawData + 8U, data[1U]);
|
|
Utils::bitsToByteBE(m_rawData + 16U, data[2U]);
|
|
Utils::bitsToByteBE(m_rawData + 24U, data[3U]);
|
|
Utils::bitsToByteBE(m_rawData + 32U, data[4U]);
|
|
Utils::bitsToByteBE(m_rawData + 40U, data[5U]);
|
|
Utils::bitsToByteBE(m_rawData + 48U, data[6U]);
|
|
Utils::bitsToByteBE(m_rawData + 56U, data[7U]);
|
|
Utils::bitsToByteBE(m_rawData + 64U, data[8U]);
|
|
}
|