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Simplify the LSF processing to allow changed META field data changed

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This commit is contained in:
Jonathan Naylor
2021-08-26 21:49:46 +01:00
parent ef6ce0ef88
commit d1dc6bb7a0
7 changed files with 148 additions and 114 deletions
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156
M17Control.cpp
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@@ -76,9 +76,12 @@ m_rfFrames(0U),
m_netFrames(0U),
m_rfErrs(0U),
m_rfBits(1U),
m_rfLSF(),
m_rfLSF1(),
m_rfLSF2(),
m_rfLSF3(),
m_rfLSFn(0U),
m_netLSF(),
m_netLSFn(0U),
m_rssiMapper(rssiMapper),
m_rssi(0U),
m_maxRSSI(0U),
@@ -106,8 +109,8 @@ bool CM17Control::writeModem(unsigned char* data, unsigned int len)
unsigned char type = data[0U];
if (type == TAG_LOST && (m_rfState == RS_RF_AUDIO || m_rfState == RS_RF_DATA_AUDIO)) {
std::string source = m_rfLSF.getSource();
std::string dest = m_rfLSF.getDest();
std::string source = m_rfLSF1.getSource();
std::string dest = m_rfLSF1.getDest();
if (m_rssi != 0U)
LogMessage("M17, transmission lost from %s to %s, %.1f seconds, BER: %.1f%%, RSSI: -%u/-%u/-%u dBm", source.c_str(), dest.c_str(), float(m_rfFrames) / 25.0F, float(m_rfErrs * 100U) / float(m_rfBits), m_minRSSI, m_maxRSSI, m_aveRSSI / m_rssiCount);
@@ -160,7 +163,7 @@ bool CM17Control::writeModem(unsigned char* data, unsigned int len)
interleaver(temp, data + 2U);
if (m_rfState == RS_RF_LISTENING && data[0U] == TAG_HEADER) {
m_rfLSF.reset();
m_rfLSF1.reset();
CM17Convolution conv;
unsigned char frame[M17_LSF_LENGTH_BYTES];
@@ -168,11 +171,11 @@ bool CM17Control::writeModem(unsigned char* data, unsigned int len)
bool valid = CM17CRC::checkCRC16(frame, M17_LSF_LENGTH_BYTES);
if (valid) {
m_rfLSF.setLinkSetup(frame);
m_rfLSF1.setLinkSetup(frame);
bool ret = processRFHeader(false);
if (!ret) {
m_rfLSF.reset();
m_rfLSF1.reset();
return false;
}
@@ -181,6 +184,8 @@ bool CM17Control::writeModem(unsigned char* data, unsigned int len)
m_rfFrames = 0U;
m_rfErrs = ber;
m_rfBits = 368U;
m_rfLSF2.reset();
m_rfLSF3.reset();
m_rfTimeoutTimer.start();
m_minRSSI = m_rssi;
m_maxRSSI = m_rssi;
@@ -188,9 +193,6 @@ bool CM17Control::writeModem(unsigned char* data, unsigned int len)
m_rssiCount = 1U;
m_rfLSFn = 0U;
if (m_network != NULL)
m_network->writeHeader(m_rfLSF.getSource(), m_rfLSF.getDest(), frame);
#if defined(DUMP_M17)
openFile();
#endif
@@ -203,7 +205,7 @@ bool CM17Control::writeModem(unsigned char* data, unsigned int len)
if (m_rfState == RS_RF_LISTENING && data[0U] == TAG_DATA) {
m_rfState = RS_RF_LATE_ENTRY;
m_rfLSF.reset();
m_rfLSF1.reset();
}
if (m_rfState == RS_RF_LATE_ENTRY && data[0U] == TAG_DATA) {
@@ -220,31 +222,27 @@ bool CM17Control::writeModem(unsigned char* data, unsigned int len)
CM17Utils::combineFragmentLICH(lich1, lich2, lich3, lich4, lich);
m_rfLSFn = (lich4 >> 5) & 0x07U;
m_rfLSF.setFragment(lich, m_rfLSFn);
m_rfLSF1.setFragment(lich, m_rfLSFn);
bool valid = m_rfLSF.isValid();
bool valid = m_rfLSF1.isValid();
if (valid) {
bool ret = processRFHeader(true);
if (!ret) {
m_rfLSF.reset();
m_rfLSF1.reset();
return false;
}
m_rfFrames = 0U;
m_rfErrs = 0U;
m_rfBits = 1U;
m_rfLSF2.reset();
m_rfLSF3.reset();
m_rfTimeoutTimer.start();
m_minRSSI = m_rssi;
m_maxRSSI = m_rssi;
m_aveRSSI = m_rssi;
m_rssiCount = 1U;
if (m_network != NULL) {
unsigned char lsf[M17_LSF_LENGTH_BYTES];
m_rfLSF.getNetwork(lsf);
m_network->writeHeader(m_rfLSF.getSource(), m_rfLSF.getDest(), lsf);
}
#if defined(DUMP_M17)
openFile();
#endif
@@ -258,6 +256,37 @@ bool CM17Control::writeModem(unsigned char* data, unsigned int len)
#if defined(DUMP_M17)
writeFile(data + 2U);
#endif
// Keep looking at the running LSF in case of changed META field data
unsigned int lich1, lich2, lich3, lich4;
bool valid1 = CGolay24128::decode24128(data + 2U + M17_SYNC_LENGTH_BYTES + 0U, lich1);
bool valid2 = CGolay24128::decode24128(data + 2U + M17_SYNC_LENGTH_BYTES + 3U, lich2);
bool valid3 = CGolay24128::decode24128(data + 2U + M17_SYNC_LENGTH_BYTES + 6U, lich3);
bool valid4 = CGolay24128::decode24128(data + 2U + M17_SYNC_LENGTH_BYTES + 9U, lich4);
if (valid1 && valid2 && valid3 && valid4) {
unsigned char lich[M17_LICH_FRAGMENT_LENGTH_BYTES];
CM17Utils::combineFragmentLICH(lich1, lich2, lich3, lich4, lich);
unsigned int n = (lich4 >> 5) & 0x07U;
m_rfLSF2.setFragment(lich, n);
// If the latest LSF is valid, save it and start collecting the next one
bool valid = m_rfLSF2.isValid();
if (valid) {
m_rfLSF3 = m_rfLSF2;
m_rfLSF2.reset();
}
}
// Update the currently transmitted LSF when the fragement number is zero
if (m_rfLSFn == 0U) {
bool valid = m_rfLSF3.isValid();
if (valid) {
m_rfLSF1 = m_rfLSF3;
m_rfLSF3.reset();
}
}
CM17Convolution conv;
unsigned char frame[M17_FN_LENGTH_BYTES + M17_PAYLOAD_LENGTH_BYTES];
unsigned int errors = conv.decodeData(data + 2U + M17_SYNC_LENGTH_BYTES + M17_LICH_FRAGMENT_FEC_LENGTH_BYTES, frame);
@@ -282,7 +311,7 @@ bool CM17Control::writeModem(unsigned char* data, unsigned int len)
CSync::addM17StreamSync(rfData + 2U);
unsigned char lich[M17_LICH_FRAGMENT_LENGTH_BYTES];
m_rfLSF.getFragment(lich, m_rfLSFn);
m_rfLSF1.getFragment(lich, m_rfLSFn);
// Add the fragment number
lich[5U] = (m_rfLSFn & 0x07U) << 5;
@@ -309,13 +338,16 @@ bool CM17Control::writeModem(unsigned char* data, unsigned int len)
}
if (m_network != NULL && m_rfTimeoutTimer.isRunning() && !m_rfTimeoutTimer.hasExpired()) {
unsigned char lich[M17_LICH_FRAGMENT_LENGTH_BYTES];
m_rfLSF.getFragment(lich, m_rfLSFn);
unsigned char netData[M17_LSF_LENGTH_BYTES + M17_FN_LENGTH_BYTES + M17_PAYLOAD_LENGTH_BYTES + M17_CRC_LENGTH_BYTES];
// Add the fragment number
lich[5U] = (m_rfLSFn & 0x07U) << 5;
m_rfLSF1.getNetwork(netData + 0U);
m_network->writeData(m_rfLSF.getSource(), m_rfLSF.getDest(), lich, frame);
// Copy the FN and payload from the frame
::memcpy(netData + M17_LSF_LENGTH_BYTES - M17_CRC_LENGTH_BYTES, frame, M17_FN_LENGTH_BYTES + M17_PAYLOAD_LENGTH_BYTES);
// The CRC is added in the networking code
m_network->write(netData);
}
m_rfFrames++;
@@ -328,8 +360,8 @@ bool CM17Control::writeModem(unsigned char* data, unsigned int len)
bool bEnd = (fn & 0x8000U) == 0x8000U;
if (bValid && bEnd) {
std::string source = m_rfLSF.getSource();
std::string dest = m_rfLSF.getDest();
std::string source = m_rfLSF1.getSource();
std::string dest = m_rfLSF1.getDest();
if (m_rssi != 0U)
LogMessage("M17, received RF end of transmission from %s to %s, %.1f seconds, BER: %.1f%%, RSSI: -%u/-%u/-%u dBm", source.c_str(), dest.c_str(), float(m_rfFrames) / 25.0F, float(m_rfErrs * 100U) / float(m_rfBits), m_minRSSI, m_maxRSSI, m_aveRSSI / m_rssiCount);
@@ -365,7 +397,9 @@ void CM17Control::writeEndRF()
m_rfTimeoutTimer.stop();
m_rfLSF.reset();
m_rfLSF1.reset();
m_rfLSF2.reset();
m_rfLSF3.reset();
if (m_netState == RS_NET_IDLE) {
m_display->clearM17();
@@ -409,17 +443,17 @@ void CM17Control::writeNetwork()
m_networkWatchdog.start();
if (netData[0U] == TAG_HEADER) {
m_netLSF.setNetwork(netData + 19U);
m_netLSF.setCAN(m_can);
if (!m_allowEncryption) {
unsigned char type = m_netLSF.getEncryptionType();
if (type != M17_ENCRYPTION_TYPE_NONE) {
m_network->reset();
return;
}
if (!m_allowEncryption) {
unsigned char type = m_netLSF.getEncryptionType();
if (type != M17_ENCRYPTION_TYPE_NONE) {
m_network->reset();
return;
}
}
if (m_netState == RS_NET_IDLE) {
m_netLSF.setNetwork(netData);
m_netLSF.setCAN(m_can);
std::string source = m_netLSF.getSource();
std::string dest = m_netLSF.getDest();
@@ -439,7 +473,7 @@ void CM17Control::writeNetwork()
m_netState = RS_NET_DATA_AUDIO;
break;
default:
LogMessage("M17, received unknown network transmission from %s to %s", source.c_str(), dest.c_str());
LogMessage("M17, received network unknown transmission from %s to %s", source.c_str(), dest.c_str());
m_network->reset();
break;
}
@@ -449,6 +483,7 @@ void CM17Control::writeNetwork()
m_netTimeoutTimer.start();
m_elapsed.start();
m_netFrames = 0U;
m_netLSFn = 0U;
// Create a dummy start message
unsigned char start[M17_FRAME_LENGTH_BYTES + 2U];
@@ -473,7 +508,13 @@ void CM17Control::writeNetwork()
writeQueueNet(start);
}
if (netData[0U] == TAG_DATA) {
if (m_netState == RS_NET_AUDIO || m_netState == RS_NET_DATA_AUDIO) {
// Refresh the LSF every six frames in case the META field changes
if (m_netLSFn == 0U) {
m_netLSF.setNetwork(netData);
m_netLSF.setCAN(m_can);
}
unsigned char data[M17_FRAME_LENGTH_BYTES + 2U];
data[0U] = TAG_DATA;
@@ -484,8 +525,15 @@ void CM17Control::writeNetwork()
m_netFrames++;
// Add the fragment LICH
unsigned char lich[M17_LICH_FRAGMENT_LENGTH_BYTES];
m_netLSF.getFragment(lich, m_netLSFn);
// Add the fragment number
lich[5U] = (m_netLSFn & 0x07U) << 5;
unsigned int frag1, frag2, frag3, frag4;
CM17Utils::splitFragmentLICH(netData + 19U, frag1, frag2, frag3, frag4);
CM17Utils::splitFragmentLICH(lich, frag1, frag2, frag3, frag4);
// Add Golay to the LICH fragment here
unsigned int lich1 = CGolay24128::encode24128(frag1);
@@ -495,9 +543,13 @@ void CM17Control::writeNetwork()
CM17Utils::combineFragmentLICHFEC(lich1, lich2, lich3, lich4, data + 2U + M17_SYNC_LENGTH_BYTES);
// Add the FN and the data/audio
unsigned char payload[M17_FN_LENGTH_BYTES + M17_PAYLOAD_LENGTH_BYTES];
::memcpy(payload, netData + 28U, M17_FN_LENGTH_BYTES + M17_PAYLOAD_LENGTH_BYTES);
// Add the Convolution FEC
CM17Convolution conv;
conv.encodeData(netData + 25U, data + 2U + M17_SYNC_LENGTH_BYTES + M17_LICH_FRAGMENT_FEC_LENGTH_BYTES);
conv.encodeData(payload, data + 2U + M17_SYNC_LENGTH_BYTES + M17_LICH_FRAGMENT_FEC_LENGTH_BYTES);
unsigned char temp[M17_FRAME_LENGTH_BYTES];
interleaver(data + 2U, temp);
@@ -505,8 +557,12 @@ void CM17Control::writeNetwork()
writeQueueNet(data);
m_netLSFn++;
if (m_netLSFn >= 6U)
m_netLSFn = 0U;
// EOT handling
uint16_t fn = (netData[25U] << 8) + (netData[26U] << 0);
uint16_t fn = (netData[28U] << 8) + (netData[29U] << 0);
if ((fn & 0x8000U) == 0x8000U) {
std::string source = m_netLSF.getSource();
std::string dest = m_netLSF.getDest();
@@ -518,19 +574,19 @@ void CM17Control::writeNetwork()
bool CM17Control::processRFHeader(bool lateEntry)
{
unsigned char packetStream = m_rfLSF.getPacketStream();
unsigned char packetStream = m_rfLSF1.getPacketStream();
if (packetStream == M17_PACKET_TYPE)
return false;
unsigned char can = m_rfLSF.getCAN();
unsigned char can = m_rfLSF1.getCAN();
if (can != m_can)
return false;
std::string source = m_rfLSF.getSource();
std::string dest = m_rfLSF.getDest();
std::string source = m_rfLSF1.getSource();
std::string dest = m_rfLSF1.getDest();
if (!m_allowEncryption) {
unsigned char type = m_rfLSF.getEncryptionType();
unsigned char type = m_rfLSF1.getEncryptionType();
if (type != M17_ENCRYPTION_TYPE_NONE) {
LogMessage("M17, access attempt with encryption from %s to %s", source.c_str(), dest.c_str());
m_rfState = RS_RF_REJECTED;
@@ -547,7 +603,7 @@ bool CM17Control::processRFHeader(bool lateEntry)
}
}
unsigned char dataType = m_rfLSF.getDataType();
unsigned char dataType = m_rfLSF1.getDataType();
switch (dataType) {
case M17_DATA_TYPE_DATA:
LogMessage("M17, received RF%sdata transmission from %s to %s", lateEntry ? " late entry " : " ", source.c_str(), dest.c_str());
@@ -580,7 +636,7 @@ bool CM17Control::processRFHeader(bool lateEntry)
CSync::addM17LinkSetupSync(data + 2U);
unsigned char setup[M17_LSF_LENGTH_BYTES];
m_rfLSF.getLinkSetup(setup);
m_rfLSF1.getLinkSetup(setup);
// Add the convolution FEC
CM17Convolution conv;