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///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2020 Edouard Griffiths, F4EXB. //
// //
// 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 as version 3 of the License, or //
// //
// 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 V3 for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
///////////////////////////////////////////////////////////////////////////////////
#include <algorithm>
#include "dsd_sync.h"
namespace DSDcc
{
const unsigned char DSDSync::m_syncPatterns[27][32] = {
// <--- past
// 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1
// 1 0 9 9 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
// index --->
// 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
{0, 0, 0, 0, 0, 0, 0, 0, 3, 1, 3, 3, 3, 3, 1, 1, 1, 3, 3, 1, 1, 3, 1, 1, 3, 1, 3, 3, 1, 1, 3, 1}, // 0: SyncDMRDataBS: DF F5 7D 75 DF 5D
{0, 0, 0, 0, 0, 0, 0, 0, 1, 3, 1, 1, 1, 1, 3, 3, 3, 1, 1, 3, 3, 1, 3, 3, 1, 3, 1, 1, 3, 3, 1, 3}, // 1: SyncDMRVoiceBS: 75 5F D7 DF 75 F7
{0, 0, 0, 0, 0, 0, 0, 0, 3, 1, 1, 1, 3, 1, 1, 3, 3, 3, 1, 3, 1, 3, 3, 3, 3, 1, 1, 3, 1, 1, 1, 3}, // 2: SyncDMRDataMS: D5 D7 F7 7F D7 57
{0, 0, 0, 0, 0, 0, 0, 0, 1, 3, 3, 3, 1, 3, 3, 1, 1, 1, 3, 1, 3, 1, 1, 1, 1, 3, 3, 1, 3, 3, 3, 1}, // 3: SyncDMRVoiceMS: 7F 7D 5D D5 7D FD
{0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 3, 3, 3, 3, 3, 1, 1, 3, 3, 1, 3, 1, 1, 3, 1, 1, 1, 1, 3, 1, 3}, // 4: SyncDPMRFS1: 57 FF 5F 75 D5 77 - non packet data header
{0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 3, 1, 1, 1, 1, 1, 3, 3, 1, 1, 3, 1, 3, 3, 1, 3, 3, 3, 3, 1, 3, 1}, // 5: SyncDPMRFS4: FD 55 F5 DF 7F DD - packet data header
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 3, 3, 3, 3, 1, 3, 1, 3, 3, 1}, // 6: SyncDPMRFS2: 5F F7 7D - superframe sync (each 2 384 bit frames)
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 3, 3, 1, 3, 1, 3, 3, 3, 3, 1, 1}, // 7: SyncDPMRFS3: 7D DF F5 - end frame sync
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 1, 3, 1, 1, 3, 3, 3, 1, 3, 1, 3, 1, 3, 3, 1, 1, 3, 1}, // 8: SyncNXDNRDCHFull
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 3, 1, 3, 3, 1, 1, 1, 3, 1, 3, 1, 3, 1, 1, 3, 3, 1, 3}, // 9: SyncNXDNRDCHFullInv
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 1, 3, 1, 3, 3, 1, 1, 3, 1}, // 10: SyncNXDNRDCHFSW
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 3, 1, 3, 1, 1, 3, 3, 1, 3}, // 11: SyncNXDNRDCHFSWInv
{0, 0, 0, 0, 0, 0, 0, 0, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 3, 3, 1, 3, 3, 1, 1, 3, 1, 3, 1, 1, 1, 1}, // 12: SyncDStarHeader
{0, 0, 0, 0, 0, 0, 0, 0, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 1, 1, 3, 1, 1, 3, 3, 1, 3, 1, 3, 3, 3, 3}, // 13: SyncDStarHeaderInv
{0, 0, 0, 0, 0, 0, 0, 0, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 3, 1, 3, 1, 1, 1, 3, 3, 1, 3, 1, 1, 1}, // 14: SyncDStar
{0, 0, 0, 0, 0, 0, 0, 0, 1, 3, 1, 3, 1, 3, 1, 3, 1, 3, 1, 1, 3, 1, 3, 3, 3, 1, 1, 3, 1, 3, 3, 3}, // 15: SyncDStarInv
{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 1, 1, 1, 1, 3, 1, 1, 3, 1, 3, 1, 1, 3, 1, 3, 1, 1, 3, 1}, // 16: SyncYSF D4 71 C9 63 4D => D5 75 DD 77 5D
{0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 3, 1, 1, 3, 3, 1, 1, 3, 3, 3, 3, 1, 3, 1, 3, 3, 3, 3, 3}, // 17: SyncP25P1
{0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 3, 3, 3, 1, 3, 3, 1, 1, 3, 3, 1, 1, 1, 1, 3, 1, 3, 1, 1, 1, 1, 1}, // 18: SyncP25P1Inv
{0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 1, 3, 1, 3, 1, 1, 1, 1, 1, 3, 1, 3, 1, 1, 1, 3, 3, 3, 1, 1, 3, 3}, // 19: SyncX2TDMADataBS
{0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 3, 1, 3, 1, 3, 3, 3, 3, 3, 1, 3, 1, 3, 3, 3, 1, 1, 1, 3, 3, 1, 1}, // 20: SyncX2TDMAVoiceBS
{0, 0, 0, 0, 0, 0, 0, 0, 3, 1, 3, 1, 1, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 3, 3, 3, 3 ,3 ,3 ,1 ,3}, // 21: SyncX2TDMADataMS
{0, 0, 0, 0, 0, 0, 0, 0, 3, 1, 3, 1, 1, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 3, 3, 3, 3 ,3 ,3 ,1 ,3}, // 22: SyncX2TDMAVoiceMS
{1, 3, 1, 3, 1, 3, 3, 3, 1, 1, 1, 3, 1, 1, 3, 1, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1, 3, 3}, // 23: SyncProVoice
{3, 1, 3, 1, 3, 1, 1, 1, 3, 3, 3, 1, 3, 3, 1, 3, 3, 3, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1, 3, 3, 1, 1}, // 24: SyncProVoiceInv
{3, 1, 1, 3, 1, 3, 1, 1, 3, 3, 1, 3, 3, 1, 1, 1, 1, 1, 3, 3, 1, 3, 1, 3, 1, 1, 3 ,1 ,1 ,1, 3 ,3}, // 25: SyncProVoiceEA
{1, 3, 3, 1, 3, 1, 3, 3, 1, 1, 3, 1, 1 ,3 ,3, 3, 3 ,3, 1, 1 ,3, 1, 3, 1, 3, 3, 1, 3, 3, 3, 1, 1} // 26: SyncProVoiceEAInv
};
// First column: number of synchronization symbols
// Second column: tolerance in number of mismatching symbols
const unsigned int DSDSync::m_syncLenTol[27][2] = {
{24, 2}, // 0: SyncDMRDataBS
{24, 2}, // 1: SyncDMRVoiceBS
{24, 2}, // 2: SyncDMRDataMS
{24, 2}, // 3: SyncDMRVoiceMS
{24, 2}, // 4: SyncDPMRFS1
{24, 2}, // 5: SyncDPMRFS4
{12, 1}, // 6: SyncDPMRFS2
{12, 1}, // 7: SyncDPMRFS3
{19, 1}, // 8: SyncNXDNRDCHFull
{19, 1}, // 9: SyncNXDNRDCHFullInv
{10, 1}, // 10: SyncNXDNRDCHFSW
{10, 1}, // 11: SyncNXDNRDCHFSWInv
{24, 2}, // 12: SyncDStarHeader
{24, 2}, // 13: SyncDStarHeaderInv
{24, 2}, // 14: SyncDStar
{24, 2}, // 15: SyncDStarInv
{20, 1}, // 16: SyncYSF
{24, 2}, // 17: SyncP25P1
{24, 2}, // 18: SyncP25P1Inv
{24, 2}, // 19: SyncX2TDMADataBS
{24, 2}, // 20: SyncX2TDMAVoiceBS
{24, 2}, // 21: SyncX2TDMADataMS
{24, 2}, // 22: SyncX2TDMAVoiceMS
{32, 2}, // 23: SyncProVoice
{32, 2}, // 24: SyncProVoiceInv
{32, 2}, // 25: SyncProVoiceEA
{32, 2}, // 26: SyncProVoiceEAInv
};
const unsigned char *DSDSync::getPattern(SyncPattern pattern, int& length)
{
length = m_syncLenTol[(int) pattern][0];
return &m_syncPatterns[(int) pattern][m_history - length];
}
void DSDSync::matchAll(const unsigned char *start)
{
std::fill(m_syncErrors, m_syncErrors + m_patterns, 0);
for (int i = 0; i < m_history; i++)
{
unsigned char c = start[i];
for (int p = 0; p < m_patterns; p++)
{
if (m_syncErrors[p] > m_syncLenTol[p][1]) {
continue;
}
if ((m_syncPatterns[p][i] != 0) && (c != m_syncPatterns[p][i])) {
m_syncErrors[p]++;
}
}
}
}
void DSDSync::matchSome(const unsigned char *start, int maxHistory, const SyncPattern *patterns, int nbPatterns)
{
std::fill(m_syncErrors, m_syncErrors + m_patterns, 0);
int pshift = m_history - maxHistory;
for (int i = 0; i < maxHistory; i++)
{
unsigned char c = start[i];
for (int ip = 0; ip < nbPatterns; ip++)
{
int p = (int) patterns[ip];
if (m_syncErrors[p] > m_syncLenTol[p][1]) {
continue;
}
if ((m_syncPatterns[p][i+pshift] != 0) && (c != m_syncPatterns[p][i+pshift])) {
m_syncErrors[p]++;
}
}
}
}
bool DSDSync::isMatching(SyncPattern pattern)
{
return m_syncErrors[pattern] <= m_syncLenTol[pattern][1];
}
unsigned int DSDSync::getErrors(SyncPattern pattern)
{
return m_syncErrors[pattern];
}
} // namespace DSDcc
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