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sdrangel/plugins/channeltx/modm17/m17modprocessor.cpp

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///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2022 Edouard Griffiths, F4EXB <f4exb06@gmail.com> //
// Copyright (C) 2023 Jon Beniston, M7RCE <jon@beniston.com> //
// //
// 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 //
// (at your option) any later version. //
// //
// 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 <codec2/codec2.h>
#include "M17Modulator.h"
#include "maincore.h"
#include "m17modax25.h"
#include "m17modprocessor.h"
MESSAGE_CLASS_DEFINITION(M17ModProcessor::MsgSendSMS, Message)
MESSAGE_CLASS_DEFINITION(M17ModProcessor::MsgSendAPRS, Message)
MESSAGE_CLASS_DEFINITION(M17ModProcessor::MsgSendAudioFrame, Message)
MESSAGE_CLASS_DEFINITION(M17ModProcessor::MsgStartAudio, Message)
MESSAGE_CLASS_DEFINITION(M17ModProcessor::MsgStopAudio, Message)
MESSAGE_CLASS_DEFINITION(M17ModProcessor::MsgStartBERT, Message)
MESSAGE_CLASS_DEFINITION(M17ModProcessor::MsgSendBERTFrame, Message)
MESSAGE_CLASS_DEFINITION(M17ModProcessor::MsgStopBERT, Message)
MESSAGE_CLASS_DEFINITION(M17ModProcessor::MsgSetGNSS, Message)
MESSAGE_CLASS_DEFINITION(M17ModProcessor::MsgStopGNSS, Message)
M17ModProcessor::M17ModProcessor() :
m_m17Modulator("MYCALL", ""),
m_lichSegmentIndex(0),
m_audioFrameIndex(0),
m_audioFrameNumber(0)
{
m_basebandFifo.setSize(96000);
m_basebandFifoLow = 4096;
m_basebandFifoHigh = 96000 - m_basebandFifoLow;
m_decimator.initialize(8000.0, 3000.0, 6);
m_codec2 = ::codec2_create(CODEC2_MODE_3200);
connect(&m_inputMessageQueue, SIGNAL(messageEnqueued()), this, SLOT(handleInputMessages()));
}
M17ModProcessor::~M17ModProcessor()
{
codec2_destroy(m_codec2);
}
bool M17ModProcessor::handleMessage(const Message& cmd)
{
if (MsgSendSMS::match(cmd))
{
const MsgSendSMS& notif = (const MsgSendSMS&) cmd;
QByteArray packetBytes = notif.getSMSText().toUtf8();
packetBytes.prepend(0x05); // SMS standard type
packetBytes.append('\0'); // SMS should be null terminated
packetBytes.truncate(798); // Maximum packet size is 798 payload + 2 bytes CRC = 800 bytes (32*25)
processPacket(notif.getSourceCall(), notif.getDestCall(), notif.getCAN(), packetBytes);
// test(notif.getSourceCall(), notif.getDestCall());
return true;
}
else if (MsgSendAPRS::match(cmd))
{
const MsgSendAPRS& notif = (const MsgSendAPRS&) cmd;
M17ModAX25 modAX25;
QString strData;
if (notif.getInsertPosition())
{
if (m_insertPositionToggle) {
strData = "!" + formatAPRSPosition();
} else {
strData = notif.getData();
}
m_insertPositionToggle = !m_insertPositionToggle;
}
else
{
strData = notif.getData();
}
QByteArray packetBytes = modAX25.makePacket(notif.getCall(), notif.getTo(), notif.getVia(), strData);
packetBytes.prepend(0x02); // APRS standard type
packetBytes.truncate(798); // Maximum packet size is 798 payload + 2 bytes CRC = 800 bytes (32*25)
processPacket(notif.getSourceCall(), notif.getDestCall(), notif.getCAN(), packetBytes);
return true;
}
else if (MsgSendAudioFrame::match(cmd))
{
MsgSendAudioFrame& notif = (MsgSendAudioFrame&) cmd;
m_audioFrame = notif.getAudioFrame();
processAudioFrame();
return true;
}
else if (MsgStartAudio::match(cmd))
{
MsgStartAudio& notif = (MsgStartAudio&) cmd;
qDebug("M17ModProcessor::handleMessage: MsgStartAudio: %s to %s",
qPrintable(notif.getSourceCall()), qPrintable(notif.getDestCall()));
audioStart(notif.getSourceCall(), notif.getDestCall(), notif.getCAN());
return true;
}
else if (MsgStopAudio::match(cmd))
{
qDebug("M17ModProcessor::handleMessage: MsgStopAudio");
audioStop();
return true;
}
else if (MsgStartBERT::match(cmd))
{
qDebug("M17ModProcessor::handleMessage: MsgStartBERT");
m_prbs.reset();
send_preamble(); // preamble
return true;
}
else if (MsgSendBERTFrame::match(cmd))
{
processBERTFrame();
return true;
}
else if (MsgStopBERT::match(cmd))
{
qDebug("M17ModProcessor::handleMessage: MsgStopBERT");
send_eot(); // EOT
return true;
}
else if (MsgSetGNSS::match(cmd))
{
qDebug("M17ModProcessor::handleMessage: MsgSetGNSS");
MsgSetGNSS& notif = (MsgSetGNSS&) cmd;
m_m17Modulator.set_gnss(notif.getLat(), notif.getLon(), notif.getAlt());
return true;
}
else if (MsgStopGNSS::match(cmd))
{
qDebug("M17ModProcessor::handleMessage: MsgStopGNSS");
m_m17Modulator.reset_gnss();
return true;
}
return false;
}
void M17ModProcessor::handleInputMessages()
{
Message* message;
while ((message = m_inputMessageQueue.pop()) != nullptr)
{
if (handleMessage(*message)) {
delete message;
}
}
}
void M17ModProcessor::test(const QString& sourceCall, const QString& destCall)
{
m_m17Modulator.source(sourceCall.toStdString());
m_m17Modulator.dest(destCall.toStdString());
for (int i = 0; i < 25; i++) {
send_preamble();
}
}
void M17ModProcessor::processPacket(const QString& sourceCall, const QString& destCall, uint8_t can, const QByteArray& packetBytes)
{
qDebug("M17ModProcessor::processPacket: %s to %s: %s", qPrintable(sourceCall), qPrintable(destCall), qPrintable(packetBytes));
m_m17Modulator.source(sourceCall.toStdString());
m_m17Modulator.dest(destCall.toStdString());
m_m17Modulator.can(can);
send_preamble(); // preamble
// LSF
std::array<uint8_t, 30> lsf;
std::array<int8_t, 368> lsf_frame = m_m17Modulator.make_lsf(lsf);
output_baseband(modemm17::M17Modulator::LSF_SYNC_WORD, lsf_frame);
// Packets
int remainderCount = packetBytes.size();
int packetCount = 0;
std::array<int8_t, 368> packet_frame;
// std::copy(modemm17::M17Modulator::DATA_SYNC_WORD.begin(), modemm17::M17Modulator::DATA_SYNC_WORD.end(), fullframe_symbols.begin());
modemm17::M17Modulator::packet_t packet;
while (remainderCount > 25)
{
std::copy(packetBytes.begin() + (packetCount*25), packetBytes.begin() + ((packetCount+1)*25), packet.begin());
packet_frame = m_m17Modulator.make_packet_frame(packetCount, 25, false, packet);
output_baseband(modemm17::M17Modulator::PACKET_SYNC_WORD, packet_frame);
remainderCount -= 25;
packetCount++;
}
std::copy(packetBytes.begin() + (packetCount*25), packetBytes.begin() + (packetCount*25) + remainderCount, packet.begin());
packet_frame = m_m17Modulator.make_packet_frame(packetCount, remainderCount, true, packet);
output_baseband(modemm17::M17Modulator::PACKET_SYNC_WORD, packet_frame);
qDebug("M17ModProcessor::processPacket: last: packetCount: %d remainderCount: %d", packetCount, remainderCount);
send_eot(); // EOT
}
void M17ModProcessor::audioStart(const QString& sourceCall, const QString& destCall, uint8_t can)
{
qDebug("M17ModProcessor::audioStart");
m_m17Modulator.source(sourceCall.toStdString());
m_m17Modulator.dest(destCall.toStdString());
m_m17Modulator.can(can);
m_audioFrameNumber = 0;
send_preamble(); // preamble
// LSF
std::array<uint8_t, 30> lsf;
std::array<int8_t, 368> lsf_frame = m_m17Modulator.make_lsf(lsf, true);
output_baseband(modemm17::M17Modulator::LSF_SYNC_WORD, lsf_frame);
// Prepare LICH
for (size_t i = 0; i < m_lich.size(); ++i)
{
std::array<uint8_t, 5> segment;
std::copy(lsf.begin() + i*5, lsf.begin() + (i + 1)*5, segment.begin());
modemm17::M17Modulator::lich_segment_t lich_segment = modemm17::M17Modulator::make_lich_segment(segment, i);
std::copy(lich_segment.begin(), lich_segment.end(), m_lich[i].begin());
}
}
void M17ModProcessor::audioStop()
{
qDebug("M17ModProcessor::audioStop");
if (m_audioFrameIndex > 0) // send remainder audio + null samples
{
std::fill(m_audioFrame.begin() + m_audioFrameIndex, m_audioFrame.end(), 0);
processAudioFrame();
m_audioFrameIndex = 0;
}
send_eot(); // EOT
}
void M17ModProcessor::send_preamble()
{
// Preamble is simple... bytes -> symbols -> baseband.
std::array<uint8_t, 48> preamble_bytes;
preamble_bytes.fill(0x77);
std::array<int8_t, 192> preamble_symbols = modemm17::M17Modulator::bytes_to_symbols(preamble_bytes);
std::array<int16_t, 1920> preamble_baseband = m_m17Modulator.symbols_to_baseband(preamble_symbols);
m_basebandFifo.write(preamble_baseband.data(), 1920);
}
void M17ModProcessor::processAudioFrame()
{
std::array<uint8_t, 16> audioPayload = encodeAudio(m_audioFrame);
std::array<int8_t, 272> audioDataBits = modemm17::M17Modulator::make_stream_data_frame(m_audioFrameNumber++, audioPayload);
if (m_audioFrameNumber == 0x8000) {
m_audioFrameNumber = 0;
}
std::array<uint8_t, 96>& lich = m_lich[m_lichSegmentIndex++];
if (m_lichSegmentIndex == 6) {
m_lichSegmentIndex = 0;
}
std::array<int8_t, 368> temp;
auto it = std::copy(lich.begin(), lich.end(), temp.begin());
std::copy(audioDataBits.begin(), audioDataBits.end(), it);
modemm17::M17Modulator::interleave_and_randomize(temp);
output_baseband(modemm17::M17Modulator::STREAM_SYNC_WORD, temp);
}
void M17ModProcessor::processBERTFrame()
{
std::array<int8_t, 368> temp = modemm17::M17Modulator::make_bert_frame(m_prbs);
modemm17::M17Modulator::interleave_and_randomize(temp);
output_baseband(modemm17::M17Modulator::BERT_SYNC_WORD, temp);
}
std::array<uint8_t, 16> M17ModProcessor::encodeAudio(std::array<int16_t, 320*6>& audioFrame)
{
std::array<int16_t, 320> audioFrame8k;
m_decimator.decimate(audioFrame.data(), audioFrame8k.data(), 320);
std::array<uint8_t, 16> result;
codec2_encode(m_codec2, &result[0], const_cast<int16_t*>(&audioFrame8k[0]));
codec2_encode(m_codec2, &result[8], const_cast<int16_t*>(&audioFrame8k[160]));
return result;
}
void M17ModProcessor::send_eot()
{
std::array<uint8_t, 2> EOT_SYNC = { 0x55, 0x5D };
std::array<uint8_t, 48> eot_bytes;
for (unsigned int i = 0; i < eot_bytes.size(); i += 2) {
std::copy(EOT_SYNC.begin(), EOT_SYNC.end(), eot_bytes.begin() + i);
}
std::array<int8_t, 192> eot_symbols = modemm17::M17Modulator::bytes_to_symbols(eot_bytes);
std::array<int16_t, 1920> eot_baseband = m_m17Modulator.symbols_to_baseband(eot_symbols);
m_basebandFifo.write(eot_baseband.data(), 1920);
}
void M17ModProcessor::output_baseband(std::array<uint8_t, 2> sync_word, const std::array<int8_t, 368>& frame)
{
std::array<int8_t, 184> symbols = modemm17::M17Modulator::bits_to_symbols(frame); // 368 bits -> 184 dibit symbols
std::array<int8_t, 8> sw = modemm17::M17Modulator::bytes_to_symbols(sync_word); // 16 bits -> 8 dibit symbols
std::array<int8_t, 192> temp; // 384 = 368 + 16 bits -> 192 dibit symbols
auto fit = std::copy(sw.begin(), sw.end(), temp.begin()); // start with sync word dibits
std::copy(symbols.begin(), symbols.end(), fit); // then the frame dibits
std::array<int16_t, 1920> baseband = m_m17Modulator.symbols_to_baseband(temp); // 1920 48 kS/s int16_t samples
m_basebandFifo.write(baseband.data(), 1920);
}
QString M17ModProcessor::formatAPRSPosition()
{
float latitude = MainCore::instance()->getSettings().getLatitude();
float longitude = MainCore::instance()->getSettings().getLongitude();
int latDeg, latMin, latFrac, latNorth;
int longDeg, longMin, longFrac, longEast;
// Convert decimal latitude to degrees, min and hundreths of a minute
latNorth = latitude >= 0.0f;
latitude = abs(latitude);
latDeg = (int) latitude;
latitude -= (float) latDeg;
latitude *= 60.0f;
latMin = (int) latitude;
latitude -= (float) latMin;
latitude *= 100.0f;
latFrac = round(latitude);
// Convert decimal longitude
longEast = longitude >= 0.0f;
longitude = abs(longitude);
longDeg = (int) longitude;
longitude -= (float) longDeg;
longitude *= 60.0f;
longMin = (int) longitude;
longitude -= (float) longMin;
longitude *= 100.0f;
longFrac = round(longitude);
// Insert position with house symbol (-) in to data field
QString latStr = QString("%1%2.%3%4")
.arg(latDeg, 2, 10, QChar('0'))
.arg(latMin, 2, 10, QChar('0'))
.arg(latFrac, 2, 10, QChar('0'))
.arg(latNorth ? 'N' : 'S');
QString longStr = QString("%1%2.%3%4")
.arg(longDeg, 3, 10, QChar('0'))
.arg(longMin, 2, 10, QChar('0'))
.arg(longFrac, 2, 10, QChar('0'))
.arg(longEast ? 'E' : 'W');
return QString("%1/%2-").arg(latStr).arg(longStr);
}
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