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dstar.cpp
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dstar.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 <math.h>
#include "dsd_decoder.h"
#include "dsd_sync.h"
#include "descramble.h"
#include "dstar.h"
namespace DSDcc
{
const unsigned char DSDDstar::m_terminationSequence[48] = {
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, 1, 3, 1, 3, 1, 3, 1,
1, 1, 1, 3, 1, 1, 3, 3, 1, 3, 1, 3, 3, 3, 3, 1,
};
const int DSDDstar::dW[72] = {
// 0-11
0, 0,
3, 2,
1, 1,
0, 0,
1, 1,
0, 0,
// 12-23
3, 2,
1, 1,
3, 2,
1, 1,
0, 0,
3, 2,
// 24-35
0, 0,
3, 2,
1, 1,
0, 0,
1, 1,
0, 0,
// 36-47
3, 2,
1, 1,
3, 2,
1, 1,
0, 0,
3, 2,
// 48-59
0, 0,
3, 2,
1, 1,
0, 0,
1, 1,
0, 0,
// 60-71
3, 2,
1, 1,
3, 3,
2, 1,
0, 0,
3, 3,
};
const int DSDDstar::dX[72] = {
// 0-11
10, 22,
11, 9,
10, 22,
11, 23,
8, 20,
9, 21,
// 12-23
10, 8,
9, 21,
8, 6,
7, 19,
8, 20,
9, 7,
// 24-35
6, 18,
7, 5,
6, 18,
7, 19,
4, 16,
5, 17,
// 36-47
6, 4,
5, 17,
4, 2,
3, 15,
4, 16,
5, 3,
// 48-59
2, 14,
3, 1,
2, 14,
3, 15,
0, 12,
1, 13,
// 60-71
2, 0,
1, 13,
0, 12,
10, 11,
0, 12,
1, 13,
};
DSDDstar::DSDDstar(DSDDecoder *dsdDecoder) :
m_dsdDecoder(dsdDecoder),
m_voiceFrameCount(0),
m_frameType(DStarVoiceFrame),
m_symbolIndex(0),
m_symbolIndexHD(0),
m_viterbi(2, Viterbi::Poly23a, false),
m_crc(CRC::PolyDStar16, 16, 0xffff, 0xffff, 1, 0, 0),
slowdataIx(0),
w(0),
x(0)
{
reset_header_strings();
m_slowData.init();
memset(nullBytes, 0, 4);
memset(slowdata, 0, 4);
}
DSDDstar::~DSDDstar()
{
}
void DSDDstar::init(bool header)
{
//fprintf(stderr, "DSDDstar::init: symbol %d (%d)\n", m_dsdDecoder->m_state.symbolcnt, m_dsdDecoder->m_dsdSymbol.getSymbol());
if (header)
{
m_dsdDecoder->m_voice1On = false;
}
else
{
m_voiceFrameCount = 0;
m_frameType = DStarVoiceFrame;
m_dsdDecoder->m_voice1On = true;
}
if ((m_dsdDecoder->m_opts.errorbars == 1) && (!header))
{
m_dsdDecoder->getLogger().log( "e:"); // print this only for voice/data frames
}
m_symbolIndex = 0;
m_symbolIndexHD = 0;
}
void DSDDstar::initVoiceFrame()
{
memset(m_dsdDecoder->ambe_fr, 0, 96);
memset((void *) m_dsdDecoder->m_mbeDVFrame1, 0, 9); // initialize DVSI frame
// voice frame
w = dW;
x = dX;
}
void DSDDstar::initDataFrame()
{
}
void DSDDstar::reset_header_strings()
{
std::cerr << "DSDDstar::reset_header_strings" << std::endl;
m_header.clear();
}
void DSDDstar::process()
{
if (m_frameType == DStarVoiceFrame)
{
processVoice();
}
else if (m_frameType == DStarDataFrame)
{
processData();
}
else if (m_frameType == DStarSyncFrame)
{
processSync();
}
}
void DSDDstar::processVoice()
{
unsigned char bit = m_dsdDecoder->m_dsdSymbol.getDibit(); // get bit from symbol and store it in cache
if (m_symbolIndex == 0) {
initVoiceFrame();
}
m_dsdDecoder->ambe_fr[*w][*x] = (1 & bit);
w++;
x++;
storeSymbolDV(m_symbolIndex, (1 & bit)); // store bits in order in DVSI frame
if (m_symbolIndex == 72-1)
{
// std::cerr << "DSDDstar::processVoice: " << m_voiceFrameCount << std::endl;
if (m_dsdDecoder->m_opts.errorbars == 1) {
m_dsdDecoder->getLogger().log("\nMBE: ");
}
m_dsdDecoder->m_mbeDecoder1.processFrame(0, m_dsdDecoder->ambe_fr, 0);
m_dsdDecoder->m_mbeDVReady1 = true; // Indicate that a DVSI frame is available
m_symbolIndex = 0;
if (m_voiceFrameCount < 20)
{
m_frameType = DStarDataFrame;
m_voiceFrameCount++;
}
else
{
m_frameType = DStarSyncFrame;
}
}
else
{
m_symbolIndex++;
}
}
void DSDDstar::processData()
{
int bit = m_dsdDecoder->m_dsdSymbol.getDibit(); // get dibit from symbol
if (m_symbolIndex == 0)
{
memset(slowdata, 0, 4);
memset(nullBytes, 0, 4);
slowdataIx = 0;
}
else if (m_symbolIndex%8 == 0)
{
slowdataIx++;
}
slowdata[slowdataIx] += bit<<(m_symbolIndex%8); // this is LSB first!
if (m_symbolIndex == 24-1) // last bit in data frame
{
// std::cerr << "DSDDstar::processData: " << m_voiceFrameCount << std::endl;
if ((m_voiceFrameCount > 0) && (memcmp(slowdata, nullBytes, 4) != 0))
{
slowdata[0] ^= 0x70;
slowdata[1] ^= 0x4f;
slowdata[2] ^= 0x93;
// std::cerr << "DSDDstar::processData:"
// << " " << std::hex << (int) (slowdata[0])
// << " " << std::hex << (int) (slowdata[1])
// << " " << std::hex << (int) (slowdata[2])
// << " (" << m_voiceFrameCount << ")" << std::endl;
processSlowData(m_voiceFrameCount == 1);
//printf("unscrambled- %s",slowdata);
}
m_symbolIndex = 0;
m_frameType = DStarVoiceFrame;
}
else
{
m_symbolIndex++;
}
}
void DSDDstar::processSlowData(bool firstFrame)
{
// byte 0
if (firstFrame || (m_slowData.counter == 0))
{
int dataType = (slowdata[0] >> 4) & 0xF;
m_slowData.counter = slowdata[0] & 0xF;
if (dataType > 6)
{
m_slowData.currentDataType = DStarSlowDataNone;
}
else if (dataType == 6) // filler
{
m_slowData.currentDataType = DStarSlowDataFiller;
m_slowData.counter = 2;
}
else if (dataType == 4) // text
{
m_slowData.textFrameIndex = m_slowData.counter % 4;
m_slowData.counter = 5;
m_slowData.currentDataType = (DStarSlowDataType) dataType;
}
else
{
m_slowData.currentDataType = (DStarSlowDataType) dataType;
}
if (firstFrame)
{
// unconditionally reset counters for elements that are always contained in the same 20 frame sequence
m_slowData.radioHeaderIndex = 0;
// initializations based on data type
switch (m_slowData.currentDataType)
{
case DStarSlowDataHeader:
if (!m_slowData.gpsStart)
{
processDPRS();
}
m_slowData.gpsStart = true;
break;
case DStarSlowDataText:
if (!m_slowData.gpsStart)
{
processDPRS();
}
m_slowData.gpsStart = true;
break;
case DStarSlowDataGPS:
if (m_slowData.gpsStart)
{
m_slowData.gpsIndex = 0;
m_slowData.gpsStart = false;
}
break;
default:
break;
}
}
// std::cerr << "DSDDstar::processSlowData: " << dataType << ":" << m_slowData.counter << std::endl;
}
else
{
if (m_slowData.counter > 0)
{
processSlowDataByte(slowdata[0]);
m_slowData.counter--;
}
}
// byte 1
if (m_slowData.counter > 0)
{
processSlowDataByte(slowdata[1]);
m_slowData.counter--;
}
// byte 2
if (m_slowData.counter > 0)
{
processSlowDataByte(slowdata[2]);
m_slowData.counter--;
}
processSlowDataGroup();
}
void DSDDstar::processSlowDataByte(unsigned char byte)
{
switch (m_slowData.currentDataType)
{
case DStarSlowDataHeader:
if (m_slowData.radioHeaderIndex < 41)
{
m_slowData.radioHeader[m_slowData.radioHeaderIndex] = byte < 32 || byte > 127 ? 46 : byte;
m_slowData.radioHeaderIndex++;
}
break;
case DStarSlowDataText:
m_slowData.text[5*m_slowData.textFrameIndex + 5 -m_slowData.counter] = byte < 32 || byte > 127 ? 46 : byte;
break;
case DStarSlowDataGPS:
m_slowData.gpsNMEA[m_slowData.gpsIndex] = byte;
m_slowData.gpsIndex++;
break;
default:
break;
}
}
void DSDDstar::processSlowDataGroup()
{
switch (m_slowData.currentDataType)
{
case DStarSlowDataHeader:
if (m_slowData.radioHeaderIndex == 41) // last byte
{
if (m_crcDStar.check_crc((unsigned char *) m_slowData.radioHeader, 41))
{
// std::cerr << "DSDDstar::processSlowDataGroup: DStarSlowDataHeader OK" << std::endl;
m_header.setRpt2((const char *) &m_slowData.radioHeader[3], false);
m_header.setRpt1((const char *) &m_slowData.radioHeader[11], false);
m_header.setYourSign((const char *) &m_slowData.radioHeader[19], false);
m_header.setMySign((const char *) &m_slowData.radioHeader[27], (const char *) &m_slowData.radioHeader[35], false);
}
// else
// {
// std::cerr << "DSDDstar::processSlowDataGroup: DStarSlowDataHeader KO" << std::endl;
// }
m_slowData.radioHeaderIndex = 0; // this is normally done on the first frame though
}
break;
case DStarSlowDataText:
m_slowData.text[20] = '\0';
// std::cerr << "DSDDstar::processSlowDataGroup: DStarSlowDataText: " << m_slowData.text << std::endl;
break;
default:
break;
}
}
void DSDDstar::processSync()
{
if (m_symbolIndex >= 72) // we're lost
{
m_dsdDecoder->m_voice1On = false;
reset_header_strings();
m_slowData.init();
m_dsdDecoder->resetFrameSync(); // end
return;
}
if (m_symbolIndex >= 12)
{
DSDSync syncEngine;
const DSDSync::SyncPattern patterns[1] = { DSDSync::SyncDStar };
syncEngine.matchSome(m_dsdDecoder->m_dsdSymbol.getNonInvertedSyncDibitBack(24), 24, patterns, 1);
if (syncEngine.isMatching(DSDSync::SyncDStar)) // sync
{
// std::cerr << "DSDDstar::processSync: SYNC" << std::endl;
m_symbolIndex = 0;
m_voiceFrameCount = 0;
m_frameType = DStarVoiceFrame;
return;
}
}
if (m_symbolIndex >= 36)
{
if (memcmp(m_dsdDecoder->m_dsdSymbol.getNonInvertedSyncDibitBack(48), m_terminationSequence, 48) == 0) // termination
{
// std::cerr << "DSDDstar::processSync: TERMINATE" << std::endl;
m_dsdDecoder->m_voice1On = false;
reset_header_strings();
m_slowData.init();
m_dsdDecoder->resetFrameSync(); // end
return;
}
}
m_symbolIndex++;
}
void DSDDstar::processHD()
{
if (m_symbolIndexHD == 660-1)
{
reset_header_strings();
m_slowData.init();
dstar_header_decode();
init(); // init for DSTAR
m_frameType = DStarVoiceFrame; // we start on a voice frame
m_voiceFrameCount = 20; // we start at one frame before sync
m_dsdDecoder->m_fsmState = DSDDecoder::DSDprocessDSTAR; // go to DSTAR
}
else
{
m_symbolIndexHD++;
}
}
void DSDDstar::dstar_header_decode()
{
unsigned char radioheaderbuffer2[660];
unsigned char radioheaderbuffer3[660];
unsigned char radioheader[41];
int octetcount, bitcount, loop;
unsigned char bit2octet[] = {0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80};
Descramble::scramble(m_dsdDecoder->m_dsdSymbol.getDibitBack(660), radioheaderbuffer2);
Descramble::deinterleave(radioheaderbuffer2, radioheaderbuffer3);
// Descramble::FECdecoder(radioheaderbuffer3, radioheaderbuffer2);
m_viterbi.decodeFromBits(radioheaderbuffer2, radioheaderbuffer3, 660, 0);
memset(radioheader, 0, 41);
// note we receive 330 bits, but we only use 328 of them (41 octets)
// bits 329 and 330 are unused
octetcount = 0;
bitcount = 0;
for (loop = 0; loop < 328; loop++)
{
if (radioheaderbuffer2[loop])
{
radioheader[octetcount] |= bit2octet[bitcount];
};
bitcount++;
// increase octetcounter and reset bitcounter every 8 bits
if (bitcount >= 8)
{
octetcount++;
bitcount = 0;
}
}
m_dsdDecoder->getLogger().log("\nDSTAR HEADER: ");
m_header.setRpt2((const char *) &radioheader[3], true);
m_dsdDecoder->getLogger().log("RPT 2: %s ", m_header.m_rpt2.c_str());
m_header.setRpt1((const char *) &radioheader[11], true);
m_dsdDecoder->getLogger().log("RPT 1: %s ", m_header.m_rpt1.c_str());
m_header.setYourSign((const char *) &radioheader[19], true);
m_dsdDecoder->getLogger().log("YOUR: %s ", m_header.m_yourSign.c_str());
m_header.setMySign((const char *) &radioheader[27], (const char *) &radioheader[35], true);
m_dsdDecoder->getLogger().log("MY: %s\n", m_header.m_mySign.c_str());
}
void DSDDstar::storeSymbolDV(int bitindex, unsigned char bit, bool lsbFirst)
{
if (lsbFirst)
{
m_dsdDecoder->m_mbeDVFrame1[bitindex/8] |= bit << (bitindex%8); // store bits in order in DVSI frame LSB first
}
else
{
m_dsdDecoder->m_mbeDVFrame1[8 - (bitindex/8)] |= bit << (7 - (bitindex%8)); // store bits in order in DVSI frame MSB first
}
}
void DSDDstar::processDPRS()
{
m_slowData.gpsNMEA[m_slowData.gpsIndex] = '\0';
if (memcmp(m_slowData.gpsNMEA, "$$CRC", 5) == 0)
{
// std::cerr << "DSDDstar::processDPRS: " << m_slowData.gpsNMEA << std::endl;
bool crcOK = m_crcDStar.check_crc(
(unsigned char *) &m_slowData.gpsNMEA[10],
(int) strlen(m_slowData.gpsNMEA)-10,
m_dprs.getCRC(&m_slowData.gpsNMEA[5]));
if (crcOK)
{
if (m_dprs.matchDSTAR(m_slowData.gpsNMEA))
{
m_dprs.m_locPoint.getLocator().toCSting(m_slowData.locator);
m_slowData.bearing = m_dsdDecoder->m_myPoint.bearingTo(m_dprs.m_locPoint);
m_slowData.distance = m_dsdDecoder->m_myPoint.distanceTo(m_dprs.m_locPoint);
// std::cerr << "DSDDstar::processDPRS: " << m_dprs.lat << ":" << m_dprs.lon << ":" << m_dprs.m_locator.toString() << std::endl;
}
}
}
}
unsigned int DSDDstar::DPRS::getCRC(const char *d)
{
char crcStr[5];
memcpy(crcStr, d, 4);
crcStr[4] = '\0';
return (unsigned int) strtol(crcStr, 0, 16);
}
bool DSDDstar::DPRS::matchDSTAR(const char *d)
{
const char *pch;
char latStr[7+1];
char lonStr[8+1];
char latH, lonH;
double x, min, deg;
pch = strstr (d, "DSTAR*:/");
if (pch)
{
pch += 15;
memcpy(latStr, pch, 7);
latStr[7] = '\0';
latH = pch[7];
x = atof(latStr);
x /= 100.0f;
min = modf(x, °);
m_lat = (deg + ((min*100.0f)/60.0f))*(latH == 'N' ? 1 : -1);
pch += 9;
memcpy(lonStr, pch, 8);
lonStr[8] = '\0';
lonH = pch[8];
x = atof(lonStr);
x /= 100.0f;
min = modf(x, °);
m_lon = (deg + ((min*100.0f)/60.0f))*(lonH == 'E' ? 1 : -1);
m_locPoint.setLatLon(m_lat, m_lon);
return true;
}
else
{
return false;
}
}
} // namespace DSDcc