mirror of
https://github.com/f4exb/sdrangel.git
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369 lines
14 KiB
C++
369 lines
14 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2022 Edouard Griffiths, F4EXB //
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// //
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// This program is free software; you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation as version 3 of the License, or //
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// (at your option) any later version. //
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// //
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// This program is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License V3 for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with this program. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////
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#include <codec2/codec2.h>
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#include "M17Modulator.h"
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#include "maincore.h"
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#include "m17modax25.h"
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#include "m17modprocessor.h"
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MESSAGE_CLASS_DEFINITION(M17ModProcessor::MsgSendSMS, Message)
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MESSAGE_CLASS_DEFINITION(M17ModProcessor::MsgSendAPRS, Message)
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MESSAGE_CLASS_DEFINITION(M17ModProcessor::MsgSendAudioFrame, Message)
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MESSAGE_CLASS_DEFINITION(M17ModProcessor::MsgStartAudio, Message)
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MESSAGE_CLASS_DEFINITION(M17ModProcessor::MsgStopAudio, Message)
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MESSAGE_CLASS_DEFINITION(M17ModProcessor::MsgStartBERT, Message)
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MESSAGE_CLASS_DEFINITION(M17ModProcessor::MsgSendBERTFrame, Message)
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MESSAGE_CLASS_DEFINITION(M17ModProcessor::MsgStopBERT, Message)
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MESSAGE_CLASS_DEFINITION(M17ModProcessor::MsgSetGNSS, Message)
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MESSAGE_CLASS_DEFINITION(M17ModProcessor::MsgStopGNSS, Message)
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M17ModProcessor::M17ModProcessor() :
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m_m17Modulator("MYCALL", ""),
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m_lichSegmentIndex(0),
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m_audioFrameIndex(0),
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m_audioFrameNumber(0)
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{
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m_basebandFifo.setSize(96000);
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m_basebandFifoLow = 4096;
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m_basebandFifoHigh = 96000 - m_basebandFifoLow;
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m_decimator.initialize(8000.0, 3000.0, 6);
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m_codec2 = ::codec2_create(CODEC2_MODE_3200);
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connect(&m_inputMessageQueue, SIGNAL(messageEnqueued()), this, SLOT(handleInputMessages()));
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}
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M17ModProcessor::~M17ModProcessor()
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{
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codec2_destroy(m_codec2);
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}
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bool M17ModProcessor::handleMessage(const Message& cmd)
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{
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if (MsgSendSMS::match(cmd))
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{
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const MsgSendSMS& notif = (const MsgSendSMS&) cmd;
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QByteArray packetBytes = notif.getSMSText().toUtf8();
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packetBytes.prepend(0x05); // SMS standard type
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packetBytes.truncate(798); // Maximum packet size is 798 payload + 2 bytes CRC = 800 bytes (32*25)
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processPacket(notif.getSourceCall(), notif.getDestCall(), notif.getCAN(), packetBytes);
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// test(notif.getSourceCall(), notif.getDestCall());
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return true;
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}
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else if (MsgSendAPRS::match(cmd))
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{
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const MsgSendAPRS& notif = (const MsgSendAPRS&) cmd;
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M17ModAX25 modAX25;
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QString strData;
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if (notif.getInsertPosition())
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{
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if (m_insertPositionToggle) {
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strData = "!" + formatAPRSPosition();
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} else {
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strData = notif.getData();
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}
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m_insertPositionToggle = !m_insertPositionToggle;
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}
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else
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{
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strData = notif.getData();
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}
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QByteArray packetBytes = modAX25.makePacket(notif.getCall(), notif.getTo(), notif.getVia(), strData);
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packetBytes.prepend(0x02); // APRS standard type
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packetBytes.truncate(798); // Maximum packet size is 798 payload + 2 bytes CRC = 800 bytes (32*25)
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processPacket(notif.getSourceCall(), notif.getDestCall(), notif.getCAN(), packetBytes);
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return true;
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}
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else if (MsgSendAudioFrame::match(cmd))
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{
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MsgSendAudioFrame& notif = (MsgSendAudioFrame&) cmd;
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m_audioFrame = notif.getAudioFrame();
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processAudioFrame();
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return true;
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}
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else if (MsgStartAudio::match(cmd))
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{
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MsgStartAudio& notif = (MsgStartAudio&) cmd;
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qDebug("M17ModProcessor::handleMessage: MsgStartAudio: %s to %s",
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qPrintable(notif.getSourceCall()), qPrintable(notif.getDestCall()));
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audioStart(notif.getSourceCall(), notif.getDestCall(), notif.getCAN());
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return true;
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}
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else if (MsgStopAudio::match(cmd))
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{
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qDebug("M17ModProcessor::handleMessage: MsgStopAudio");
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audioStop();
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return true;
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}
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else if (MsgStartBERT::match(cmd))
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{
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qDebug("M17ModProcessor::handleMessage: MsgStartBERT");
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m_prbs.reset();
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send_preamble(); // preamble
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return true;
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}
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else if (MsgSendBERTFrame::match(cmd))
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{
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processBERTFrame();
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return true;
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}
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else if (MsgStopBERT::match(cmd))
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{
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qDebug("M17ModProcessor::handleMessage: MsgStopBERT");
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send_eot(); // EOT
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return true;
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}
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else if (MsgSetGNSS::match(cmd))
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{
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qDebug("M17ModProcessor::handleMessage: MsgSetGNSS");
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MsgSetGNSS& notif = (MsgSetGNSS&) cmd;
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m_m17Modulator.set_gnss(notif.getLat(), notif.getLon(), notif.getAlt());
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return true;
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}
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else if (MsgStopGNSS::match(cmd))
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{
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qDebug("M17ModProcessor::handleMessage: MsgStopGNSS");
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m_m17Modulator.reset_gnss();
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return true;
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}
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return false;
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}
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void M17ModProcessor::handleInputMessages()
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{
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Message* message;
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while ((message = m_inputMessageQueue.pop()) != nullptr)
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{
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if (handleMessage(*message)) {
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delete message;
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}
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}
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}
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void M17ModProcessor::test(const QString& sourceCall, const QString& destCall)
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{
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m_m17Modulator.source(sourceCall.toStdString());
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m_m17Modulator.dest(destCall.toStdString());
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for (int i = 0; i < 25; i++) {
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send_preamble();
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}
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}
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void M17ModProcessor::processPacket(const QString& sourceCall, const QString& destCall, uint8_t can, const QByteArray& packetBytes)
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{
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qDebug("M17ModProcessor::processPacket: %s to %s: %s", qPrintable(sourceCall), qPrintable(destCall), qPrintable(packetBytes));
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m_m17Modulator.source(sourceCall.toStdString());
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m_m17Modulator.dest(destCall.toStdString());
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m_m17Modulator.can(can);
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send_preamble(); // preamble
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// LSF
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std::array<uint8_t, 30> lsf;
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std::array<int8_t, 368> lsf_frame = m_m17Modulator.make_lsf(lsf);
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output_baseband(modemm17::M17Modulator::LSF_SYNC_WORD, lsf_frame);
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// Packets
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int remainderCount = packetBytes.size();
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int packetCount = 0;
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std::array<int8_t, 368> packet_frame;
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// std::copy(modemm17::M17Modulator::DATA_SYNC_WORD.begin(), modemm17::M17Modulator::DATA_SYNC_WORD.end(), fullframe_symbols.begin());
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modemm17::M17Modulator::packet_t packet;
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while (remainderCount > 25)
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{
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std::copy(packetBytes.begin() + (packetCount*25), packetBytes.begin() + ((packetCount+1)*25), packet.begin());
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packet_frame = m_m17Modulator.make_packet_frame(packetCount, 25, false, packet);
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output_baseband(modemm17::M17Modulator::PACKET_SYNC_WORD, packet_frame);
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remainderCount -= 25;
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packetCount++;
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}
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std::copy(packetBytes.begin() + (packetCount*25), packetBytes.begin() + (packetCount*25) + remainderCount, packet.begin());
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packet_frame = m_m17Modulator.make_packet_frame(packetCount, remainderCount, true, packet);
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output_baseband(modemm17::M17Modulator::PACKET_SYNC_WORD, packet_frame);
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qDebug("M17ModProcessor::processPacket: last: packetCount: %d remainderCount: %d", packetCount, remainderCount);
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send_eot(); // EOT
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}
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void M17ModProcessor::audioStart(const QString& sourceCall, const QString& destCall, uint8_t can)
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{
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qDebug("M17ModProcessor::audioStart");
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m_m17Modulator.source(sourceCall.toStdString());
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m_m17Modulator.dest(destCall.toStdString());
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m_m17Modulator.can(can);
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m_audioFrameNumber = 0;
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send_preamble(); // preamble
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// LSF
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std::array<uint8_t, 30> lsf;
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std::array<int8_t, 368> lsf_frame = m_m17Modulator.make_lsf(lsf, true);
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output_baseband(modemm17::M17Modulator::LSF_SYNC_WORD, lsf_frame);
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// Prepare LICH
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for (size_t i = 0; i < m_lich.size(); ++i)
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{
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std::array<uint8_t, 5> segment;
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std::copy(lsf.begin() + i*5, lsf.begin() + (i + 1)*5, segment.begin());
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modemm17::M17Modulator::lich_segment_t lich_segment = modemm17::M17Modulator::make_lich_segment(segment, i);
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std::copy(lich_segment.begin(), lich_segment.end(), m_lich[i].begin());
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}
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}
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void M17ModProcessor::audioStop()
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{
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qDebug("M17ModProcessor::audioStop");
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if (m_audioFrameIndex > 0) // send remainder audio + null samples
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{
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std::fill(m_audioFrame.begin() + m_audioFrameIndex, m_audioFrame.end(), 0);
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processAudioFrame();
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m_audioFrameIndex = 0;
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}
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send_eot(); // EOT
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}
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void M17ModProcessor::send_preamble()
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{
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// Preamble is simple... bytes -> symbols -> baseband.
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std::array<uint8_t, 48> preamble_bytes;
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preamble_bytes.fill(0x77);
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std::array<int8_t, 192> preamble_symbols = modemm17::M17Modulator::bytes_to_symbols(preamble_bytes);
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std::array<int16_t, 1920> preamble_baseband = m_m17Modulator.symbols_to_baseband(preamble_symbols);
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m_basebandFifo.write(preamble_baseband.data(), 1920);
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}
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void M17ModProcessor::processAudioFrame()
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{
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std::array<uint8_t, 16> audioPayload = encodeAudio(m_audioFrame);
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std::array<int8_t, 272> audioDataBits = modemm17::M17Modulator::make_stream_data_frame(m_audioFrameNumber++, audioPayload);
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if (m_audioFrameNumber == 0x8000) {
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m_audioFrameNumber = 0;
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}
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std::array<uint8_t, 96>& lich = m_lich[m_lichSegmentIndex++];
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if (m_lichSegmentIndex == 6) {
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m_lichSegmentIndex = 0;
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}
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std::array<int8_t, 368> temp;
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auto it = std::copy(lich.begin(), lich.end(), temp.begin());
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std::copy(audioDataBits.begin(), audioDataBits.end(), it);
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modemm17::M17Modulator::interleave_and_randomize(temp);
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output_baseband(modemm17::M17Modulator::STREAM_SYNC_WORD, temp);
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}
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void M17ModProcessor::processBERTFrame()
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{
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std::array<int8_t, 368> temp = modemm17::M17Modulator::make_bert_frame(m_prbs);
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modemm17::M17Modulator::interleave_and_randomize(temp);
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output_baseband(modemm17::M17Modulator::BERT_SYNC_WORD, temp);
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}
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std::array<uint8_t, 16> M17ModProcessor::encodeAudio(std::array<int16_t, 320*6>& audioFrame)
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{
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std::array<int16_t, 320> audioFrame8k;
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m_decimator.decimate(audioFrame.data(), audioFrame8k.data(), 320);
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std::array<uint8_t, 16> result;
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codec2_encode(m_codec2, &result[0], const_cast<int16_t*>(&audioFrame8k[0]));
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codec2_encode(m_codec2, &result[8], const_cast<int16_t*>(&audioFrame8k[160]));
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return result;
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}
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void M17ModProcessor::send_eot()
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{
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std::array<uint8_t, 2> EOT_SYNC = { 0x55, 0x5D };
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std::array<uint8_t, 48> eot_bytes;
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for (unsigned int i = 0; i < eot_bytes.size(); i += 2) {
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std::copy(EOT_SYNC.begin(), EOT_SYNC.end(), eot_bytes.begin() + i);
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}
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std::array<int8_t, 192> eot_symbols = modemm17::M17Modulator::bytes_to_symbols(eot_bytes);
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std::array<int16_t, 1920> eot_baseband = m_m17Modulator.symbols_to_baseband(eot_symbols);
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m_basebandFifo.write(eot_baseband.data(), 1920);
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}
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void M17ModProcessor::output_baseband(std::array<uint8_t, 2> sync_word, const std::array<int8_t, 368>& frame)
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{
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std::array<int8_t, 184> symbols = modemm17::M17Modulator::bits_to_symbols(frame); // 368 bits -> 184 dibit symbols
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std::array<int8_t, 8> sw = modemm17::M17Modulator::bytes_to_symbols(sync_word); // 16 bits -> 8 dibit symbols
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std::array<int8_t, 192> temp; // 384 = 368 + 16 bits -> 192 dibit symbols
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auto fit = std::copy(sw.begin(), sw.end(), temp.begin()); // start with sync word dibits
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std::copy(symbols.begin(), symbols.end(), fit); // then the frame dibits
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std::array<int16_t, 1920> baseband = m_m17Modulator.symbols_to_baseband(temp); // 1920 48 kS/s int16_t samples
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m_basebandFifo.write(baseband.data(), 1920);
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}
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QString M17ModProcessor::formatAPRSPosition()
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{
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float latitude = MainCore::instance()->getSettings().getLatitude();
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float longitude = MainCore::instance()->getSettings().getLongitude();
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int latDeg, latMin, latFrac, latNorth;
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int longDeg, longMin, longFrac, longEast;
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// Convert decimal latitude to degrees, min and hundreths of a minute
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latNorth = latitude >= 0.0f;
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latitude = abs(latitude);
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latDeg = (int) latitude;
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latitude -= (float) latDeg;
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latitude *= 60.0f;
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latMin = (int) latitude;
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latitude -= (float) latMin;
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latitude *= 100.0f;
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latFrac = round(latitude);
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// Convert decimal longitude
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longEast = longitude >= 0.0f;
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longitude = abs(longitude);
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longDeg = (int) longitude;
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longitude -= (float) longDeg;
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longitude *= 60.0f;
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longMin = (int) longitude;
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longitude -= (float) longMin;
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longitude *= 100.0f;
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longFrac = round(longitude);
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// Insert position with house symbol (-) in to data field
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QString latStr = QString("%1%2.%3%4")
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.arg(latDeg, 2, 10, QChar('0'))
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.arg(latMin, 2, 10, QChar('0'))
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.arg(latFrac, 2, 10, QChar('0'))
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.arg(latNorth ? 'N' : 'S');
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QString longStr = QString("%1%2.%3%4")
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.arg(longDeg, 3, 10, QChar('0'))
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.arg(longMin, 2, 10, QChar('0'))
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.arg(longFrac, 2, 10, QChar('0'))
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.arg(longEast ? 'E' : 'W');
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return QString("%1/%2-").arg(latStr).arg(longStr);
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}
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