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nxdn.cpp
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nxdn.cpp
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///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2016 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 <iostream>
#include "nxdn.h"
#include "nxdnconvolution.h"
#include "nxdncrc.h"
#include "dsd_decoder.h"
#include "dsd_sync.h"
namespace DSDcc
{
/*
* DMR AMBE interleave schedule
*/
// bit 1
const int DSDNXDN::rW[36] = {
0, 1, 0, 1, 0, 1,
0, 1, 0, 1, 0, 1,
0, 1, 0, 1, 0, 1,
0, 1, 0, 1, 0, 2,
0, 2, 0, 2, 0, 2,
0, 2, 0, 2, 0, 2
};
const int DSDNXDN::rX[36] = {
23, 10, 22, 9, 21, 8,
20, 7, 19, 6, 18, 5,
17, 4, 16, 3, 15, 2,
14, 1, 13, 0, 12, 10,
11, 9, 10, 8, 9, 7,
8, 6, 7, 5, 6, 4
};
// bit 0
const int DSDNXDN::rY[36] = {
0, 2, 0, 2, 0, 2,
0, 2, 0, 3, 0, 3,
1, 3, 1, 3, 1, 3,
1, 3, 1, 3, 1, 3,
1, 3, 1, 3, 1, 3,
1, 3, 1, 3, 1, 3
};
const int DSDNXDN::rZ[36] = {
5, 3, 4, 2, 3, 1,
2, 0, 1, 13, 0, 12,
22, 11, 21, 10, 20, 9,
19, 8, 18, 7, 17, 6,
16, 5, 15, 4, 14, 3,
13, 2, 12, 1, 11, 0
};
const char * DSDNXDN::nxdnRFChannelTypeText[5] = {
"RC", //!< RCCH
"RT", //!< RTCH
"RD", //!< RDCH
"Rt", //!< RTCH-C
"RU" //!< Unknown RF channel
};
const int DSDNXDN::SACCH::m_Interleave[60] = {
0, 12, 24, 36, 48,
1, 13, 25, 37, 49,
2, 14, 26, 38, 50,
3, 15, 27, 39, 51,
4, 16, 28, 40, 52,
5, 17, 29, 41, 53,
6, 18, 30, 42, 54,
7, 19, 31, 43, 55,
8, 20, 32, 44, 56,
9, 21, 33, 45, 57,
10, 22, 34, 46, 58,
11, 23, 35, 47, 59,
};
const int DSDNXDN::SACCH::m_PunctureList[12] = { 5, 11, 17, 23, 29, 35, 41, 47, 53, 59, 65, 71 };
const int DSDNXDN::CACOutbound::m_Interleave[300] = {
0, 12, 24, 36, 48, 60, 72, 84, 96, 108, 120, 132, 144, 156, 168, 180, 192, 204, 216, 228, 240, 252, 264, 276, 288,
1, 13, 25, 37, 49, 61, 73, 85, 97, 109, 121, 133, 145, 157, 169, 181, 193, 205, 217, 229, 241, 253, 265, 277, 289,
2, 14, 26, 38, 50, 62, 74, 86, 98, 110, 122, 134, 146, 158, 170, 182, 194, 206, 218, 230, 242, 254, 266, 278, 290,
3, 15, 27, 39, 51, 63, 75, 87, 99, 111, 123, 135, 147, 159, 171, 183, 195, 207, 219, 231, 243, 255, 267, 279, 291,
4, 16, 28, 40, 52, 64, 76, 88, 100, 112, 124, 136, 148, 160, 172, 184, 196, 208, 220, 232, 244, 256, 268, 280, 292,
5, 17, 29, 41, 53, 65, 77, 89, 101, 113, 125, 137, 149, 161, 173, 185, 197, 209, 221, 233, 245, 257, 269, 281, 293,
6, 18, 30, 42, 54, 66, 78, 90, 102, 114, 126, 138, 150, 162, 174, 186, 198, 210, 222, 234, 246, 258, 270, 282, 294,
7, 19, 31, 43, 55, 67, 79, 91, 103, 115, 127, 139, 151, 163, 175, 187, 199, 211, 223, 235, 247, 259, 271, 283, 295,
8, 20, 32, 44, 56, 68, 80, 92, 104, 116, 128, 140, 152, 164, 176, 188, 200, 212, 224, 236, 248, 260, 272, 284, 296,
9, 21, 33, 45, 57, 69, 81, 93, 105, 117, 129, 141, 153, 165, 177, 189, 201, 213, 225, 237, 249, 261, 273, 285, 297,
10, 22, 34, 46, 58, 70, 82, 94, 106, 118, 130, 142, 154, 166, 178, 190, 202, 214, 226, 238, 250, 262, 274, 286, 298,
11, 23, 35, 47, 59, 71, 83, 95, 107, 119, 131, 143, 155, 167, 179, 191, 203, 215, 227, 239, 251, 263, 275, 287, 299,
};
const int DSDNXDN::CACOutbound::m_PunctureList[50] = {
3, 11, // 0
17, 25, // 1 14
31, 39, // 2 28
45, 53, // 3 42
59, 67, // 4 56
73, 81, // 5 70
87, 95, // 6 84
101, 109, // 7 98
115, 123, // 8 112
129, 137, // 9 126
143, 151, // 10 140
157, 165, // 11 154
171, 179, // 12 168
185, 193, // 13 182
199, 207, // 14 196
213, 221, // 15 210
227, 235, // 16 224
241, 249, // 17 238
255, 263, // 18 252
269, 277, // 19 266
283, 291, // 20 280
297, 305, // 21 294
311, 319, // 22 308
325, 333, // 23 322
339, 347, // 24 336
};
const int DSDNXDN::CACLong::m_Interleave[252] = {
0, 12, 24, 36, 48, 60, 72, 84, 96, 108, 120, 132, 144, 156, 168, 180, 192, 204, 216, 228, 240,
1, 13, 25, 37, 49, 61, 73, 85, 97, 109, 121, 133, 145, 157, 169, 181, 193, 205, 217, 229, 241,
2, 14, 26, 38, 50, 62, 74, 86, 98, 110, 122, 134, 146, 158, 170, 182, 194, 206, 218, 230, 242,
3, 15, 27, 39, 51, 63, 75, 87, 99, 111, 123, 135, 147, 159, 171, 183, 195, 207, 219, 231, 243,
4, 16, 28, 40, 52, 64, 76, 88, 100, 112, 124, 136, 148, 160, 172, 184, 196, 208, 220, 232, 244,
5, 17, 29, 41, 53, 65, 77, 89, 101, 113, 125, 137, 149, 161, 173, 185, 197, 209, 221, 233, 245,
6, 18, 30, 42, 54, 66, 78, 90, 102, 114, 126, 138, 150, 162, 174, 186, 198, 210, 222, 234, 246,
7, 19, 31, 43, 55, 67, 79, 91, 103, 115, 127, 139, 151, 163, 175, 187, 199, 211, 223, 235, 247,
8, 20, 32, 44, 56, 68, 80, 92, 104, 116, 128, 140, 152, 164, 176, 188, 200, 212, 224, 236, 248,
9, 21, 33, 45, 57, 69, 81, 93, 105, 117, 129, 141, 153, 165, 177, 189, 201, 213, 225, 237, 249,
10, 22, 34, 46, 58, 70, 82, 94, 106, 118, 130, 142, 154, 166, 178, 190, 202, 214, 226, 238, 250,
11, 23, 35, 47, 59, 71, 83, 95, 107, 119, 131, 143, 155, 167, 179, 191, 203, 215, 227, 239, 251,
};
const int DSDNXDN::CACLong::m_PunctureList[60] = {
1, 7, 9, 11, 19,
27, 33, 35, 37, 45,
53, 59, 61, 63, 71,
79, 85, 87, 89, 97,
105, 111, 113, 115, 123,
131, 137, 139, 141, 149,
157, 163, 165, 167, 175,
183, 189, 191, 193, 201,
209, 215, 217, 219, 227,
235, 241, 243, 245, 253,
261, 267, 269, 271, 279,
287, 293, 295, 297, 305
};
const int DSDNXDN::FACCH1::m_Interleave[144] = {
0, 16, 32, 48, 64, 80, 96, 112, 128,
1, 17, 33, 49, 65, 81, 97, 113, 129,
2, 18, 34, 50, 66, 82, 98, 114, 130,
3, 19, 35, 51, 67, 83, 99, 115, 131,
4, 20, 36, 52, 68, 84, 100, 116, 132,
5, 21, 37, 53, 69, 85, 101, 117, 133,
6, 22, 38, 54, 70, 86, 102, 118, 134,
7, 23, 39, 55, 71, 87, 103, 119, 135,
8, 24, 40, 56, 72, 88, 104, 120, 136,
9, 25, 41, 57, 73, 89, 105, 121, 137,
10, 26, 42, 58, 74, 90, 106, 122, 138,
11, 27, 43, 59, 75, 91, 107, 123, 139,
12, 28, 44, 60, 76, 92, 108, 124, 140,
13, 29, 45, 61, 77, 93, 109, 125, 141,
14, 30, 46, 62, 78, 94, 110, 126, 142,
15, 31, 47, 63, 79, 95, 111, 127, 143,
};
const int DSDNXDN::FACCH1::m_PunctureList[48] = {
1, 5, 9, 13, 17, 21, 25, 29, 33, 37, 41, 45, 49, 53, 57, 61, 65, 69, 73, 77,
81, 85, 89, 93, 97, 101, 105, 109, 113, 117, 121, 125, 129, 133, 137, 141, 145,
149, 153, 157, 161, 165, 169, 173, 177, 181, 185, 189,
};
const int DSDNXDN::UDCH::m_Interleave[348] = {
0, 12, 24, 36, 48, 60, 72, 84, 96, 108, 120, 132, 144, 156, 168, 180, 192, 204, 216, 228, 240, 252, 264, 276, 288, 300, 312, 324, 336,
1, 13, 25, 37, 49, 61, 73, 85, 97, 109, 121, 133, 145, 157, 169, 181, 193, 205, 217, 229, 241, 253, 265, 277, 289, 301, 313, 325, 337,
2, 14, 26, 38, 50, 62, 74, 86, 98, 110, 122, 134, 146, 158, 170, 182, 194, 206, 218, 230, 242, 254, 266, 278, 290, 302, 314, 326, 338,
3, 15, 27, 39, 51, 63, 75, 87, 99, 111, 123, 135, 147, 159, 171, 183, 195, 207, 219, 231, 243, 255, 267, 279, 291, 303, 315, 327, 339,
4, 16, 28, 40, 52, 64, 76, 88, 100, 112, 124, 136, 148, 160, 172, 184, 196, 208, 220, 232, 244, 256, 268, 280, 292, 304, 316, 328, 340,
5, 17, 29, 41, 53, 65, 77, 89, 101, 113, 125, 137, 149, 161, 173, 185, 197, 209, 221, 233, 245, 257, 269, 281, 293, 305, 317, 329, 341,
6, 18, 30, 42, 54, 66, 78, 90, 102, 114, 126, 138, 150, 162, 174, 186, 198, 210, 222, 234, 246, 258, 270, 282, 294, 306, 318, 330, 342,
7, 19, 31, 43, 55, 67, 79, 91, 103, 115, 127, 139, 151, 163, 175, 187, 199, 211, 223, 235, 247, 259, 271, 283, 295, 307, 319, 331, 343,
8, 20, 32, 44, 56, 68, 80, 92, 104, 116, 128, 140, 152, 164, 176, 188, 200, 212, 224, 236, 248, 260, 272, 284, 296, 308, 320, 332, 344,
9, 21, 33, 45, 57, 69, 81, 93, 105, 117, 129, 141, 153, 165, 177, 189, 201, 213, 225, 237, 249, 261, 273, 285, 297, 309, 321, 333, 345,
10, 22, 34, 46, 58, 70, 82, 94, 106, 118, 130, 142, 154, 166, 178, 190, 202, 214, 226, 238, 250, 262, 274, 286, 298, 310, 322, 334, 346,
11, 23, 35, 47, 59, 71, 83, 95, 107, 119, 131, 143, 155, 167, 179, 191, 203, 215, 227, 239, 251, 263, 275, 287, 299, 311, 323, 335, 347,
};
const int DSDNXDN::UDCH::m_PunctureList[58] = {
3, 11,
17, 25,
31, 39,
45, 53,
59, 67,
73, 81,
87, 95,
101, 109,
115, 123,
129, 137,
143, 151,
157, 165,
171, 179,
185, 193,
199, 207,
213, 221,
227, 235,
241, 249,
255, 263,
269, 277,
283, 291,
297, 305,
311, 319,
325, 333,
339, 347,
353, 361,
367, 375,
381, 389,
395, 403,
};
// NXDN Technical Specifications - NXDN TS 1-A Version 1.3 p.165
const unsigned char DSDNXDN::m_voiceTestPattern[36] = {
3, 0, 3, 2, 2, 2, 2, 0, // CEA8 11 00 11 10 10 10 10 00
3, 3, 3, 2, 2, 0, 0, 3, // FE83 11 11 11 10 10 00 00 11
2, 2, 3, 0, 3, 0, 1, 0, // ACC4 10 10 11 00 11 00 01 00
1, 1, 2, 0, 0, 2, 0, 0, // 5820 01 01 10 00 00 10 00 00
0, 0, 2, 2, // 0A 00 00 10 10
};
DSDNXDN::DSDNXDN(DSDDecoder *dsdDecoder) :
m_dsdDecoder(dsdDecoder),
m_state(NXDNFrame),
m_pn(0xe4), // TS 1A v0103 section 4.6
m_inSync(false),
m_lichEvenParity(0),
m_symbolIndex(0),
m_swallowCount(0),
w(0),
x(0),
y(0),
z(0)
{
memset(m_syncBuffer, 0, 10);
memset(m_lichBuffer, 0, 8);
m_rfChannel = NXDNRFCHUnknown;
m_frameStructure = NXDNFSReserved;
m_steal = NXDNStealReserved;
m_ran = 0;
m_idle = true;
m_sourceId = 0;
m_destinationId = 0;
m_group = false;
m_messageType = 0;
m_locationId = 0;
m_services = 0;
m_fullRate = false;
m_rfChannelStr[0] = '\0';
}
DSDNXDN::~DSDNXDN()
{
}
void DSDNXDN::init()
{
if (!m_inSync)
{
std::cerr << "DSDNXDN::init: entering sync state" << std::endl;
m_currentMessage.reset();
m_inSync = true;
m_fullRate = false;
m_dsdDecoder->setMbeRate(DSDDecoder::DSDMBERate3600x2450);
}
m_symbolIndex = 0;
m_lichEvenParity = 0;
m_state = NXDNFrame;
}
void DSDNXDN::process()
{
switch(m_state)
{
case NXDNFrame:
processFrame();
break;
case NXDNPostFrame:
processPostFrame();
break;
case NXDNSwallow:
processSwallow();
break;
default:
std::cerr << "DSDNXDN::process: unsupported state (end)" << std::endl;
m_dsdDecoder->m_voice1On = false;
m_dsdDecoder->resetFrameSync(); // end
m_inSync = false;
}
}
int DSDNXDN::unscrambleDibit(int dibit)
{
//return dibit;
return m_pn.getBit(m_symbolIndex) ? dibit ^ 2 : dibit; // apply PN scrambling. Inverting symbol is a XOR by 2 on the dibit.
}
void DSDNXDN::processFrame()
{
int dibitRaw = m_dsdDecoder->m_dsdSymbol.getDibit();
int dibit = unscrambleDibit(dibitRaw);
// if (m_symbolIndex == 0) {
// std::cerr << "DSDNXDN::processFrame: start" << std::endl;
// }
if (m_symbolIndex < 8) // LICH info
{
acquireLICH(dibit);
m_symbolIndex++;
if (m_symbolIndex == 8) {
processLICH();
}
}
else if (m_symbolIndex < 8 + 174)
{
switch (m_rfChannel)
{
case NXDNRCCH:
processRCCH(m_symbolIndex - 8, dibit);
break;
case NXDNRTCH:
case NXDNRDCH:
case NXDNRTCHC:
processRTDCH(m_symbolIndex - 8, dibit);
break;
case NXDNRFCHUnknown:
default:
break; // do nothing
}
m_symbolIndex++;
}
else // look for next 192 symbols frame...
{
// process first presumably sync symbol
if ((dibitRaw == 0) || (dibitRaw == 1)) { // positives => 1 (+3)
m_syncBuffer[0] = 1;
} else { // negatives => 3 (-3)
m_syncBuffer[0] = 3;
}
m_state = NXDNPostFrame; // look for next frame sync (FCH) or end
m_symbolIndex = 1; // first sync symbol consumed already
}
}
void DSDNXDN::processPostFrame()
{
if (m_symbolIndex < 10)
{
int dibit = m_dsdDecoder->m_dsdSymbol.getDibit(); // get dibit from symbol
if ((dibit == 0) || (dibit == 1)) { // positives => 1 (+3)
m_syncBuffer[m_symbolIndex] = 1;
} else { // negatives => 3 (-3)
m_syncBuffer[m_symbolIndex] = 3;
}
m_symbolIndex++;
if (m_symbolIndex == 10) {
processFSW();
}
}
else // out of sync => terminate
{
std::cerr << "DSDNXDN::processPostFrame: out of sync (end)" << std::endl;
m_dsdDecoder->m_voice1On = false;
m_dsdDecoder->resetFrameSync(); // end
m_inSync = false;
}
}
void DSDNXDN::processFSW()
{
int match_late2 = 0; // count of FSW symbols matches late by 2 symbols
int match_late1 = 0; // count of FSW symbols matches late by 1 symbol
int match_spot = 0; // count of FSW symbols matches on the spot
int match_earl1 = 0; // count of FSW symbols matches early by 1 symbol
int match_earl2 = 0; // count of FSW symbols matches early by 2 symbols
const unsigned char *fsw;
int fswLength;
if (m_dsdDecoder->getSyncType() == DSDDecoder::DSDSyncNXDNP) {
fsw = DSDSync::getPattern(DSDSync::SyncNXDNRDCHFSW, fswLength);
} else if (m_dsdDecoder->getSyncType() == DSDDecoder::DSDSyncNXDNN) {
fsw = DSDSync::getPattern(DSDSync::SyncNXDNRDCHFSWInv, fswLength);
} else
{
std::cerr << "DSDNXDN::processFSW: sync inconsistent (end)" << std::endl;
m_dsdDecoder->m_voice1On = false;
m_dsdDecoder->resetFrameSync(); // end
m_inSync = false;
return;
}
for (int i = 0; i < 10; i++)
{
if (m_syncBuffer[i] == fsw[i]) {
match_spot++;
}
if ((i < 7) && (m_syncBuffer[i] == fsw[i+2])) {
match_late2++;
}
if ((i < 8) && (m_syncBuffer[i] == fsw[i+1])) {
match_late1++;
}
if ((i > 0) && (m_syncBuffer[i] == fsw[i-1])) {
match_earl1++;
}
if ((i > 1) && (m_syncBuffer[i] == fsw[i-2])) {
match_earl2++;
}
}
if (match_spot >= 7)
{
init();
}
else if (match_earl1 >= 6)
{
std::cerr << "DSDNXDN::processFSW: match early -1" << std::endl;
m_swallowCount = 1;
m_state = NXDNSwallow;
}
else if (match_late1 >= 6)
{
std::cerr << "DSDNXDN::processFSW: match late +1" << std::endl;
m_symbolIndex = 0;
m_lichEvenParity = 0;
acquireLICH(unscrambleDibit(m_syncBuffer[9])); // re-introduce last symbol
m_symbolIndex++;
m_state = NXDNFrame;
}
else if (match_earl2 >= 5)
{
std::cerr << "DSDNXDN::processFSW: match early -2" << std::endl;
m_swallowCount = 2;
m_state = NXDNSwallow;
}
else if (match_late2 >= 5)
{
std::cerr << "DSDNXDN::processFSW: match late +2" << std::endl;
m_symbolIndex = 0;
m_lichEvenParity = 0;
acquireLICH(unscrambleDibit(m_syncBuffer[8])); // re-introduce symbol before last symbol
m_symbolIndex++;
acquireLICH(unscrambleDibit(m_syncBuffer[9])); // re-introduce last symbol
m_symbolIndex++;
m_state = NXDNFrame;
}
else
{
std::cerr << "DSDNXDN::processFSW: sync lost (end)" << std::endl;
m_dsdDecoder->m_voice1On = false;
m_dsdDecoder->resetFrameSync(); // end
m_inSync = false;
}
}
void DSDNXDN::processSwallow()
{
if (m_swallowCount > 0) {
m_swallowCount--;
}
if (m_swallowCount == 0) {
init();
}
}
void DSDNXDN::acquireLICH(int dibit)
{
m_lichBuffer[m_symbolIndex] = dibit >> 1; // conversion is a divide by 2
if (m_symbolIndex < 6) {
m_lichEvenParity += m_lichBuffer[m_symbolIndex];
}
}
void DSDNXDN::processLICH()
{
m_lich.rfChannelCode = 2*m_lichBuffer[0] + m_lichBuffer[1]; // MSB first
m_lich.fnChannelCode = 2*m_lichBuffer[2] + m_lichBuffer[3];
m_lich.optionCode = 2*m_lichBuffer[4] + m_lichBuffer[5];
m_lich.direction = m_lichBuffer[6];
m_lich.parity = m_lichBuffer[7];
m_lichEvenParity += m_lich.parity; // you have to sum with parity bit and then test even-ness
if (m_lichEvenParity % 2) // odd is wrong
{
m_rfChannel = NXDNRFCHUnknown;
strcpy(m_rfChannelStr, "XX");
m_dsdDecoder->m_voice1On = false;
std::cerr << "DSDNXDN::processLICH: parity error" << std::endl;
std::cerr << "DSDNXDN::processLICH:"
<< " rfChannelCode: " << m_lich.rfChannelCode
<< " fnChannelCode: " << m_lich.fnChannelCode
<< " optionCode: " << m_lich.optionCode
<< " direction: " << m_lich.direction
<< " parity: " << m_lich.parity
<< " m_lichEvenParity: " << m_lichEvenParity << std::endl;
}
else
{
m_rfChannel = (NXDNRFChannel) m_lich.rfChannelCode;
memcpy(m_rfChannelStr, nxdnRFChannelTypeText[(int) m_rfChannel], 3);
switch(m_rfChannel)
{
case NXDNRCCH:
m_idle = false;
if (m_lich.fnChannelCode == 0) {
m_frameStructure = m_lich.direction ? NXDNFSCAC: NXDNFSReserved;
} else if (m_lich.fnChannelCode == 1) {
m_frameStructure = m_lich.direction ? NXDNFSReserved: NXDNFSCACLong;
} else if (m_lich.fnChannelCode == 3) {
m_frameStructure = m_lich.direction ? NXDNFSReserved: NXDNFSCACShort;
} else {
m_frameStructure = NXDNFSReserved;
}
break;
case NXDNRTCH:
case NXDNRDCH:
case NXDNRTCHC:
m_idle = false;
if (m_lich.fnChannelCode == 0) {
m_frameStructure = NXDNFSSACCH;
} else if (m_lich.fnChannelCode == 1) {
m_frameStructure = NXDNFSUDCH;
} else if (m_lich.fnChannelCode == 2) {
m_frameStructure = NXDNFSSACCHSup;
} else {
m_frameStructure = NXDNFSSACCHIdle;
m_idle = true;
}
break;
default:
break;
}
if ((m_frameStructure == NXDNFSSACCH) || (m_frameStructure == NXDNFSSACCHSup))
{
m_steal = (NXDNSteal) m_lich.optionCode;
m_dsdDecoder->m_voice1On = (m_steal != NXDNStealBoth);
}
else if (m_frameStructure == NXDNFSUDCH)
{
m_dsdDecoder->m_voice1On = false;
if ((m_lich.optionCode == 0) || (m_lich.optionCode == 3)) {
m_steal = (NXDNSteal) m_lich.optionCode;
} else {
m_steal = NXDNStealReserved;
}
}
else
{
m_steal = NXDNStealReserved;
}
}
}
void DSDNXDN::processRCCH(int index, unsigned char dibit)
{
switch(m_frameStructure)
{
case NXDNFSCAC: // CAC outbound
{
if (index == 0) {
m_cac.reset();
}
if (index < 150) {
m_cac.pushDibit(dibit);
}
if (index == 150)
{
m_cac.unpuncture();
if (m_cac.decode())
{
m_ran = m_cac.getRAN();
m_currentMessage.setFromCAC(&m_cac.getData()[1]);
m_messageType = m_currentMessage.getMessageType();
m_currentMessage.getSourceUnitId(m_sourceId);
m_currentMessage.getDestinationGroupId(m_destinationId);
m_currentMessage.isGroupCall(m_group);
m_currentMessage.getLocationId(m_locationId);
m_currentMessage.getServiceInformation(m_services);
if (m_currentMessage.isFullRate(m_fullRate)) {
m_dsdDecoder->setMbeRate(isFullRate() ? DSDDecoder::DSDMBERate7200x4400 : DSDDecoder::DSDMBERate3600x2450);
}
if (m_cac.hasDualMessageFormat())
{
m_currentMessage.setMessageIndex(1);
m_currentMessage.getSourceUnitId(m_sourceId);
m_currentMessage.getDestinationGroupId(m_destinationId);
m_currentMessage.isGroupCall(m_group);
m_currentMessage.getLocationId(m_locationId);
m_currentMessage.getServiceInformation(m_services);
if (m_currentMessage.isFullRate(m_fullRate)) {
m_dsdDecoder->setMbeRate(isFullRate() ? DSDDecoder::DSDMBERate7200x4400 : DSDDecoder::DSDMBERate3600x2450);
}
if (m_currentMessage.getAdjacentSitesInformation(m_adjacentSites, 1)) {
printAdjacentSites();
}
m_currentMessage.setMessageIndex(0);
if (m_currentMessage.getAdjacentSitesInformation(m_adjacentSites, 1)) {
printAdjacentSites();
}
}
else
{
if (m_currentMessage.getAdjacentSitesInformation(m_adjacentSites, 3)) {
printAdjacentSites();
}
}
}
}
}
break;
case NXDNFSCACShort: // Short CAC
{
if (index == 0) {
m_cacShort.reset();
}
if (index < 126) {
m_cacShort.pushDibit(dibit);
}
if (index == 126)
{
m_cacShort.unpuncture();
if (m_cacShort.decode())
{
m_ran = m_cacShort.getRAN();
m_currentMessage.setFromCACShort(&m_cacShort.getData()[1]);
m_messageType = m_currentMessage.getMessageType();
m_currentMessage.getSourceUnitId(m_sourceId);
m_currentMessage.getDestinationGroupId(m_destinationId);
m_currentMessage.isGroupCall(m_group);
m_currentMessage.getLocationId(m_locationId);
m_currentMessage.getServiceInformation(m_services);
if (m_currentMessage.isFullRate(m_fullRate)) {
m_dsdDecoder->setMbeRate(isFullRate() ? DSDDecoder::DSDMBERate7200x4400 : DSDDecoder::DSDMBERate3600x2450);
}
}
}
}
break;
case NXDNFSCACLong: // Long CAC
{
if (index == 0) {
m_cacLong.reset();
}
if (index < 126) {
m_cacLong.pushDibit(dibit);
}
if (index == 126)
{
m_cacLong.unpuncture();
if (m_cacLong.decode())
{
m_ran = m_cacLong.getRAN();
m_currentMessage.setFromCACLong(&m_cacLong.getData()[1]);
m_messageType = m_currentMessage.getMessageType();
m_currentMessage.getSourceUnitId(m_sourceId);
m_currentMessage.getDestinationGroupId(m_destinationId);
m_currentMessage.isGroupCall(m_group);
m_currentMessage.getLocationId(m_locationId);
m_currentMessage.getServiceInformation(m_services);
if (m_currentMessage.isFullRate(m_fullRate)) {
m_dsdDecoder->setMbeRate(isFullRate() ? DSDDecoder::DSDMBERate7200x4400 : DSDDecoder::DSDMBERate3600x2450);
}
}
}
}
break;
default: // invalid
break;
}
}
void DSDNXDN::processRTDCH(int index, unsigned char dibit)
{
if ((m_frameStructure == NXDNFSSACCH) || (m_frameStructure == NXDNFSSACCHSup))
{
if (index == 0) {
m_sacch.reset();
}
if (index < 30) {
m_sacch.pushDibit(dibit);
}
if (index == 30)
{
m_sacch.unpuncture();
if (m_sacch.decode())
{
m_ran = m_sacch.getRAN();
if ((m_sacch.getCountdown() == 0) && (m_sacch.getDecodeCount() == 0))
{
m_currentMessage = m_sacch.getMessage();
m_messageType = m_currentMessage.getMessageType();
m_currentMessage.getSourceUnitId(m_sourceId);
m_currentMessage.getDestinationGroupId(m_destinationId);
m_currentMessage.isGroupCall(m_group);
if (m_currentMessage.isFullRate(m_fullRate)) {
m_dsdDecoder->setMbeRate(isFullRate() ? DSDDecoder::DSDMBERate7200x4400 : DSDDecoder::DSDMBERate3600x2450);
}
}
}
}
if (index >= 30)
{
int vindex = index - 30; // rebase index at start of Voice/FACCH frames
if (m_steal == NXDNStealNone) // 4 voice frames EHR - 2 voice frames EFR
{
if (isFullRate()) {
processVoiceFrameEFR(vindex, dibit);
} else {
processVoiceFrameEHR(vindex, dibit);
}
}
else if (m_steal == NXDNSteal1) // FACCH1 then 2 voice frames EHR or 1 voice frame EFR
{
if (vindex < 72) {
processFACCH1(vindex, dibit);
}
else
{
if (isFullRate()) {
processVoiceFrameEFR(vindex-72, dibit);
} else {
processVoiceFrameEHR(vindex-72, dibit);
}
}
}
else if (m_steal == NXDNSteal2) // 2 voice frames EHR or 1 voice frame EFR then FACCH1
{
if (vindex < 72)
{
if (isFullRate()) {
processVoiceFrameEFR(vindex, dibit);
} else {
processVoiceFrameEHR(vindex, dibit);
}
}
else {
processFACCH1(vindex-72, dibit);
}
}
else if (m_steal == NXDNStealBoth) // All FACCH1
{
if (vindex < 72) {
processFACCH1(vindex, dibit);
} else {
processFACCH1(vindex-72, dibit);
}
}
}
}
else if (m_frameStructure == NXDNFSUDCH)
{
if (index == 0) {
m_udch.reset();
}
if (index < 174) {
m_udch.pushDibit(dibit);
}
if (index == 174)
{
m_udch.unpuncture();
if (m_udch.decode())
{
m_ran = m_udch.getRAN();
m_currentMessage.setFromFACCH2(&m_udch.getData()[1]);
m_messageType = m_currentMessage.getMessageType();
m_currentMessage.getSourceUnitId(m_sourceId);
m_currentMessage.getDestinationGroupId(m_destinationId);
m_currentMessage.isGroupCall(m_group);
if (m_currentMessage.isFullRate(m_fullRate)) {
m_dsdDecoder->setMbeRate(isFullRate() ? DSDDecoder::DSDMBERate7200x4400 : DSDDecoder::DSDMBERate3600x2450);
}
if (m_steal == NXDNStealBoth) // This is a FACCH2
{
if (m_currentMessage.getAdjacentSitesInformation(m_adjacentSites, 4)) {
printAdjacentSites();
}
}
}
}
}
// Do nothing if SACCH with idle status
}
void DSDNXDN::processFACCH1(int index, unsigned char dibit)
{
if (index == 0) {
m_facch1.reset();
}
if (index < 72) {
m_facch1.pushDibit(dibit);
}
if (index == 72-1)
{
m_facch1.unpuncture();
if (m_facch1.decode())
{
m_currentMessage.setFromFACCH1(m_facch1.getData());
m_messageType = m_currentMessage.getMessageType();
m_currentMessage.getSourceUnitId(m_sourceId);
m_currentMessage.getDestinationGroupId(m_destinationId);
m_currentMessage.isGroupCall(m_group);
if (m_currentMessage.isFullRate(m_fullRate)) {
m_dsdDecoder->setMbeRate(isFullRate() ? DSDDecoder::DSDMBERate7200x4400 : DSDDecoder::DSDMBERate3600x2450);
}
if (m_currentMessage.getAdjacentSitesInformation(m_adjacentSites, 1)) {
printAdjacentSites();
}
}
m_facch1.reset();
}
}
DSDNXDN::FnChannel::FnChannel() :
m_nbPuncture(0),
m_rawSize(0),
m_bufRaw(0),
m_bufTmp(0),
m_interleave(0),
m_punctureList(0)
{
reset();
}
DSDNXDN::FnChannel::~FnChannel()
{}
void DSDNXDN::FnChannel::reset()
{
m_index = 0;
}
void DSDNXDN::FnChannel::pushDibit(unsigned char dibit)
{
m_bufRaw[m_interleave[m_index++]] = (dibit&2)>>1;
m_bufRaw[m_interleave[m_index++]] = dibit&1;
}
void DSDNXDN::FnChannel::unpuncture()
{
if (m_nbPuncture == 0) {
return;
}
int index, punctureIndex, i;
for (index = 0, punctureIndex = 0, i = 0; i < m_rawSize; i++)
{
if (index == m_punctureList[punctureIndex])
{
m_bufTmp[index++] = 1;
punctureIndex++;
}
m_bufTmp[index++] = m_bufRaw[i]<<1; // 0->0, 1->2
}
for (int i=0; i<8; i++) {
m_bufTmp[index++] = 0;
}
}
DSDNXDN::SACCH::SACCH()
{
m_rawSize = 60;
m_nbPuncture = 12;
m_bufRaw = m_sacchRaw;
m_bufTmp = m_temp;
m_interleave = m_Interleave;
m_punctureList = m_PunctureList;
m_message.reset();
m_decodeCount = 0;
}
DSDNXDN::SACCH::~SACCH()
{}
bool DSDNXDN::SACCH::decode()
{
CNXDNConvolution conv;
conv.start();
int n = 0;
for (unsigned int i = 0U; i < 40U; i++)
{
uint8_t s0 = m_temp[n++];
uint8_t s1 = m_temp[n++];
conv.decode(s0, s1);
}
conv.chainback(m_data, 36U);
if (!CNXDNCRC::checkCRC6(m_data, 26U))
{
std::cerr << "DSDNXDN::SACCH::decode: bad CRC" << std::endl;
if (m_decodeCount >= 0) {
m_decodeCount = -1;
}
return false;
}
else
{
if (getCountdown() == 3) {
m_decodeCount = 3;
} else {
m_decodeCount--;
}
m_message.setFromSACCH(3-getCountdown(), &m_data[1]);
return true;
}
}
unsigned char DSDNXDN::SACCH::getRAN() const
{
return m_data[0U] & 0x3FU;
}
unsigned char DSDNXDN::SACCH::getCountdown() const
{
return (m_data[0U] >> 6) & 0x03U;
}