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107 lines
2.9 KiB
107 lines
2.9 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) 2015,2016 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 "Defines.h"
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#include "dmr/data/EMB.h"
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#include "edac/QR1676.h"
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using namespace dmr::data;
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using namespace dmr;
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#include <cstdio>
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#include <cassert>
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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 EMB class.
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/// </summary>
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EMB::EMB() :
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m_colorCode(0U),
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m_PI(false),
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m_LCSS(0U)
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{
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/* stub */
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}
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/// <summary>
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/// Finalizes a instance of the EMB class.
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/// </summary>
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EMB::~EMB()
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{
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/* stub */
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}
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/// <summary>
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/// Decodes DMR embedded signalling data.
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/// </summary>
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/// <param name="data"></param>
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void EMB::decode(const uint8_t* data)
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{
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assert(data != NULL);
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uint8_t DMREMB[2U];
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DMREMB[0U] = (data[13U] << 4) & 0xF0U;
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DMREMB[0U] |= (data[14U] >> 4) & 0x0FU;
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DMREMB[1U] = (data[18U] << 4) & 0xF0U;
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DMREMB[1U] |= (data[19U] >> 4) & 0x0FU;
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// decode QR (16,7,6) FEC
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edac::QR1676::decode(DMREMB);
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m_colorCode = (DMREMB[0U] >> 4) & 0x0FU;
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m_PI = (DMREMB[0U] & 0x08U) == 0x08U;
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m_LCSS = (DMREMB[0U] >> 1) & 0x03U;
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}
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/// <summary>
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/// Encodes DMR embedded signalling data.
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/// </summary>
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/// <param name="data"></param>
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void EMB::encode(uint8_t* data) const
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{
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assert(data != NULL);
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uint8_t DMREMB[2U];
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DMREMB[0U] = (m_colorCode << 4) & 0xF0U;
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DMREMB[0U] |= m_PI ? 0x08U : 0x00U;
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DMREMB[0U] |= (m_LCSS << 1) & 0x06U;
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DMREMB[1U] = 0x00U;
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// encode QR (16,7,6) FEC
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edac::QR1676::encode(DMREMB);
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data[13U] = (data[13U] & 0xF0U) | ((DMREMB[0U] >> 4U) & 0x0FU);
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data[14U] = (data[14U] & 0x0FU) | ((DMREMB[0U] << 4U) & 0xF0U);
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data[18U] = (data[18U] & 0xF0U) | ((DMREMB[1U] >> 4U) & 0x0FU);
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data[19U] = (data[19U] & 0x0FU) | ((DMREMB[1U] << 4U) & 0xF0U);
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}
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