mirror of
https://github.com/f4exb/sdrangel.git
synced 2024-11-09 01:56:05 -05:00
973 lines
29 KiB
C++
973 lines
29 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
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// Copyright (C) 2023 Jon Beniston, M7RCE //
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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 <QDebug>
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#include "util/dsc.h"
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#include "util/popcount.h"
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// "short" strings are meant to be compatible with YaDDNet
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QMap<DSCMessage::FormatSpecifier, QString> DSCMessage::m_formatSpecifierStrings = {
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{GEOGRAPHIC_CALL, "Geographic call"},
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{DISTRESS_ALERT, "Distress alert"},
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{GROUP_CALL, "Group call"},
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{ALL_SHIPS, "All ships"},
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{SELECTIVE_CALL, "Selective call"},
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{AUTOMATIC_CALL, "Automatic call"}
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};
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QMap<DSCMessage::FormatSpecifier, QString> DSCMessage::m_formatSpecifierShortStrings = {
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{GEOGRAPHIC_CALL, "AREA"},
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{DISTRESS_ALERT, "DIS"},
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{GROUP_CALL, "GRP"},
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{ALL_SHIPS, "ALL"},
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{SELECTIVE_CALL, "SEL"},
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{AUTOMATIC_CALL, "AUT"}
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};
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QMap<DSCMessage::Category, QString> DSCMessage::m_categoryStrings = {
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{ROUTINE, "Routine"},
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{SAFETY, "Safety"},
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{URGENCY, "Urgency"},
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{DISTRESS, "Distress"}
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};
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QMap<DSCMessage::Category, QString> DSCMessage::m_categoryShortStrings = {
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{ROUTINE, "RTN"},
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{SAFETY, "SAF"},
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{URGENCY, "URG"},
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{DISTRESS, "DIS"}
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};
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QMap<DSCMessage::FirstTelecommand, QString> DSCMessage::m_telecommand1Strings = {
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{F3E_G3E_ALL_MODES_TP, "F3E (FM speech)/G3E (phase modulated speech) all modes telephony"},
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{F3E_G3E_DUPLEX_TP, "F3E (FM speech)/G3E (phase modulated speech) duplex telephony"},
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{POLLING, "Polling"},
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{UNABLE_TO_COMPLY, "Unable to comply"},
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{END_OF_CALL, "End of call"},
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{DATA, "Data"},
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{J3E_TP, "J3E (SSB) telephony"},
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{DISTRESS_ACKNOWLEDGEMENT, "Distress acknowledgement"},
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{DISTRESS_ALERT_RELAY, "Distress alert relay"},
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{F1B_J2B_TTY_FEC, "F1B (FSK) J2B (FSK via SSB) TTY FEC"},
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{F1B_J2B_TTY_AQR, "F1B (FSK) J2B (FSK via SSB) TTY AQR"},
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{TEST, "Test"},
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{POSITION_UPDATE, "Position update"},
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{NO_INFORMATION, "No information"}
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};
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QMap<DSCMessage::FirstTelecommand, QString> DSCMessage::m_telecommand1ShortStrings = {
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{F3E_G3E_ALL_MODES_TP, "F3E/G3E"},
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{F3E_G3E_DUPLEX_TP, "F3E/G3E, Duplex TP"},
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{POLLING, "POLL"},
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{UNABLE_TO_COMPLY, "UNABLE TO COMPLY"},
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{END_OF_CALL, "EOC"},
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{DATA, "DATA"},
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{J3E_TP, "J3E TP"},
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{DISTRESS_ACKNOWLEDGEMENT, "DISTRESS ACK"},
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{DISTRESS_ALERT_RELAY, "DISTRESS RELAY"},
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{F1B_J2B_TTY_FEC, "F1B/J2B TTY-FEC"},
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{F1B_J2B_TTY_AQR, "F1B/J2B TTY-ARQ"},
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{TEST, "TEST"},
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{POSITION_UPDATE, "POSUPD"},
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{NO_INFORMATION, "NOINF"}
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};
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QMap<DSCMessage::SecondTelecommand, QString> DSCMessage::m_telecommand2Strings = {
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{NO_REASON, "No reason"},
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{CONGESTION, "Congestion at switching centre"},
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{BUSY, "Busy"},
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{QUEUE, "Queue indication"},
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{BARRED, "Station barred"},
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{NO_OPERATOR, "No operator available"},
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{OPERATOR_UNAVAILABLE, "Operator temporarily unavailable"},
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{EQUIPMENT_DISABLED, "Equipment disabled"},
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{UNABLE_TO_USE_CHANNEL, "Unable to use proposed channel"},
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{UNABLE_TO_USE_MODE, "Unable to use proposed mode"},
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{NOT_PARTIES_TO_CONFLICT, "Ships and aircraft of States not parties to an armed conflict"},
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{MEDICAL_TRANSPORTS, "Medical transports"},
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{PAY_PHONE, "Pay-phone/public call office"},
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{FAX, "Facsimile"},
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{NO_INFORMATION_2, "No information"}
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};
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QMap<DSCMessage::SecondTelecommand, QString> DSCMessage::m_telecommand2ShortStrings = {
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{NO_REASON, "NO REASON GIVEN"},
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{CONGESTION, "CONGESTION AT MARITIME CENTRE"},
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{BUSY, "BUSY"},
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{QUEUE, "QUEUE INDICATION"},
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{BARRED, "STATION BARRED"},
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{NO_OPERATOR, "NO OPERATOR AVAILABLE"},
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{OPERATOR_UNAVAILABLE, "OPERATOR TEMPORARILY UNAVAILABLE"},
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{EQUIPMENT_DISABLED, "EQUIPMENT DISABLED"},
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{UNABLE_TO_USE_CHANNEL, "UNABLE TO USE PROPOSED CHANNEL"},
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{UNABLE_TO_USE_MODE, "UNABLE TO USE PROPOSED MODE"},
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{NOT_PARTIES_TO_CONFLICT, "SHIPS/AIRCRAFT OF STATES NOT PARTIES TO ARMED CONFLICT"},
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{MEDICAL_TRANSPORTS, "MEDICAL TRANSPORTS"},
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{PAY_PHONE, "PAY-PHONE/PUBLIC CALL OFFICE"},
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{FAX, "FAX/DATA ACCORDING ITU-R M1081"},
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{NO_INFORMATION_2, "NOINF"}
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};
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QMap<DSCMessage::DistressNature, QString> DSCMessage::m_distressNatureStrings = {
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{FIRE, "Fire, explosion"},
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{FLOODING, "Flooding"},
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{COLLISION, "Collision"},
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{GROUNDING, "Grounding"},
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{LISTING, "Listing"},
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{SINKING, "Sinking"},
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{ADRIFT, "Adrift"},
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{UNDESIGNATED, "Undesignated"},
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{ABANDONING_SHIP, "Abandoning ship"},
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{PIRACY, "Piracy, armed attack"},
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{MAN_OVERBOARD, "Man overboard"},
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{EPIRB, "EPIRB"}
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};
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QMap<DSCMessage::EndOfSignal, QString> DSCMessage::m_endOfSignalStrings = {
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{REQ, "Req ACK"},
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{ACK, "ACK"},
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{EOS, "EOS"}
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};
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QMap<DSCMessage::EndOfSignal, QString> DSCMessage::m_endOfSignalShortStrings = {
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{REQ, "REQ"},
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{ACK, "ACK"},
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{EOS, "EOS"}
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};
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DSCMessage::DSCMessage(const QByteArray& data, QDateTime dateTime) :
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m_dateTime(dateTime),
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m_data(data)
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{
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decode(data);
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}
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QString DSCMessage::toString(const QString separator) const
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{
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QStringList s;
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s.append(QString("Format specifier: %1").arg(formatSpecifier()));
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if (m_hasAddress) {
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s.append(QString("Address: %1").arg(m_address));
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}
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if (m_hasCategory) {
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s.append(QString("Category: %1").arg(category()));
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}
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s.append(QString("Self Id: %1").arg(m_selfId));
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if (m_hasTelecommand1) {
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s.append(QString("Telecommand 1: %1").arg(telecommand1(m_telecommand1)));
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}
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if (m_hasTelecommand2) {
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s.append(QString("Telecommand 2: %1").arg(telecommand2(m_telecommand2)));
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}
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if (m_hasDistressId) {
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s.append(QString("Distress Id: %1").arg(m_distressId));
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}
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if (m_hasDistressNature)
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{
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s.append(QString("Distress nature: %1").arg(distressNature(m_distressNature)));
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s.append(QString("Distress coordinates: %1").arg(m_position));
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}
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else if (m_hasPosition)
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{
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s.append(QString("Position: %1").arg(m_position));
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}
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if (m_hasFrequency1) {
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s.append(QString("RX Frequency: %1Hz").arg(m_frequency1));
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}
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if (m_hasChannel1) {
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s.append(QString("RX Channel: %1").arg(m_channel1));
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}
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if (m_hasFrequency2) {
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s.append(QString("TX Frequency: %1Hz").arg(m_frequency2));
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}
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if (m_hasChannel2) {
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s.append(QString("TX Channel: %1").arg(m_channel2));
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}
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if (m_hasNumber) {
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s.append(QString("Phone Number: %1").arg(m_number));
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}
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if (m_hasTime) {
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s.append(QString("Time: %1").arg(m_time.toString()));
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}
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if (m_hasSubsequenceComms) {
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s.append(QString("Subsequent comms: %1").arg(telecommand1(m_subsequenceComms)));
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}
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return s.join(separator);
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}
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QString DSCMessage::toYaddNetFormat(const QString& id, qint64 frequency) const
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{
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QStringList s;
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// rx_id
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s.append(QString("[%1]").arg(id));
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// rx_freq
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float frequencyKHZ = frequency / 1000.0f;
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s.append(QString("%1").arg(frequencyKHZ, 0, 'f', 1));
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// fmt
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s.append(formatSpecifier(true));
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// to
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if (m_hasAddress)
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{
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if (m_formatSpecifier == GEOGRAPHIC_CALL)
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{
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char ns = m_addressLatitude >= 0 ? 'N' : 'S';
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char ew = m_addressLongitude >= 0 ? 'E' : 'W';
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int lat = abs(m_addressLatitude);
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int lon = abs(m_addressLongitude);
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s.append(QString("AREA %2%1%6=>%4%1 %3%1%7=>%5%1")
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.arg(QChar(0xb0)) // degree
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.arg(lat, 2, 10, QChar('0'))
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.arg(lon, 3, 10, QChar('0'))
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.arg(m_addressLatAngle, 2, 10, QChar('0'))
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.arg(m_addressLonAngle, 2, 10, QChar('0'))
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.arg(ns)
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.arg(ew));
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}
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else
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{
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s.append(m_address);
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}
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}
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else
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{
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s.append("");
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}
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// cat
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s.append(category(true));
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// from
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s.append(m_selfId);
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// tc1
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if (m_hasTelecommand1) {
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s.append(telecommand1(m_telecommand1, true));
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} else {
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s.append("--");
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}
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// tc2
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if (m_hasTelecommand2) {
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s.append(telecommand2(m_telecommand2, true));
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} else {
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s.append("--");
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}
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// distress fields don't appear to be used!
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// freq
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if (m_hasFrequency1 && m_hasFrequency2) {
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s.append(QString("%1/%2KHz").arg(m_frequency1/1000.0, 7, 'f', 1, QChar('0')).arg(m_frequency2/1000.0, 7, 'f', 1, QChar('0')));
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} else if (m_hasFrequency1) {
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s.append(QString("%1KHz").arg(m_frequency1/1000.0, 7, 'f', 1, QChar('0')));
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} else if (m_hasFrequency2) {
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s.append(QString("%1KHz").arg(m_frequency2/1000.0, 7, 'f', 1, QChar('0')));
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} else if (m_hasChannel1 && m_hasChannel2) {
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s.append(QString("%1/%2").arg(m_channel1).arg(m_channel2));
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} else if (m_hasChannel1) {
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s.append(QString("%1").arg(m_channel1));
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} else if (m_hasChannel2) {
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s.append(QString("%1").arg(m_channel2));
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} else {
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s.append("--");
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}
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// pos
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if (m_hasPosition) {
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s.append(m_position); // FIXME: Format??
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} else {
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s.append("--"); // Sometimes this is " -- ". in YaDD Why?
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}
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// eos
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s.append(endOfSignal(m_eos, true));
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// ecc
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s.append(QString("ECC %1 %2").arg(m_calculatedECC).arg(m_eccOk ? "OK" : "ERR"));
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return s.join(";");
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}
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QString DSCMessage::formatSpecifier(bool shortString) const
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{
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if (shortString)
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{
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if (m_formatSpecifierShortStrings.contains(m_formatSpecifier)) {
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return m_formatSpecifierShortStrings[m_formatSpecifier];
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} else {
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return QString("UNK/ERR").arg(m_formatSpecifier);
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}
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}
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else
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{
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if (m_formatSpecifierStrings.contains(m_formatSpecifier)) {
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return m_formatSpecifierStrings[m_formatSpecifier];
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} else {
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return QString("Unknown (%1)").arg(m_formatSpecifier);
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}
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}
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}
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QString DSCMessage::category(bool shortString) const
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{
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if (shortString)
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{
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if (m_categoryShortStrings.contains(m_category)) {
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return m_categoryShortStrings[m_category];
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} else {
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return QString("UNK/ERR").arg(m_category);
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}
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}
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else
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{
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if (!m_hasCategory) {
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return "N/A";
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} else if (m_categoryStrings.contains(m_category)) {
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return m_categoryStrings[m_category];
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} else {
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return QString("Unknown (%1)").arg(m_category);
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}
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}
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}
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QString DSCMessage::telecommand1(FirstTelecommand telecommand, bool shortString)
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{
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if (shortString)
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{
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if (m_telecommand1ShortStrings.contains(telecommand)) {
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return m_telecommand1ShortStrings[telecommand];
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} else {
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return QString("UNK/ERR").arg(telecommand);
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}
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}
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else
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{
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if (m_telecommand1Strings.contains(telecommand)) {
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return m_telecommand1Strings[telecommand];
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} else {
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return QString("Unknown (%1)").arg(telecommand);
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}
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}
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}
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QString DSCMessage::telecommand2(SecondTelecommand telecommand, bool shortString)
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{
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if (shortString)
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{
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if (m_telecommand2ShortStrings.contains(telecommand)) {
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return m_telecommand2ShortStrings[telecommand];
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} else {
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return QString("UNK/ERR").arg(telecommand);
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}
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}
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else
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{
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if (m_telecommand2Strings.contains(telecommand)) {
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return m_telecommand2Strings[telecommand];
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} else {
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return QString("Unknown (%1)").arg(telecommand);
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}
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}
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}
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QString DSCMessage::distressNature(DistressNature nature)
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{
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if (m_distressNatureStrings.contains(nature)) {
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return m_distressNatureStrings[nature];
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} else {
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return QString("Unknown (%1)").arg(nature);
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}
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}
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QString DSCMessage::endOfSignal(EndOfSignal eos, bool shortString)
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{
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if (shortString)
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{
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if (m_endOfSignalShortStrings.contains(eos)) {
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return m_endOfSignalShortStrings[eos];
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} else {
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return QString("UNK/ERR").arg(eos);
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}
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}
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else
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{
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if (m_endOfSignalStrings.contains(eos)) {
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return m_endOfSignalStrings[eos];
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} else {
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return QString("Unknown (%1)").arg(eos);
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}
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}
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}
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QString DSCMessage::symbolsToDigits(const QByteArray data, int startIdx, int length)
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{
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QString s;
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for (int i = 0; i < length; i++)
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{
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QString digits = QString("%1").arg((int)data[startIdx+i], 2, 10, QChar('0'));
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s = s.append(digits);
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}
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return s;
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}
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QString DSCMessage::formatCoordinates(int latitude, int longitude)
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{
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QString lat, lon;
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if (latitude >= 0) {
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lat = QString("%1%2N").arg(latitude).arg(QChar(0xb0));
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} else {
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lat = QString("%1%2S").arg(-latitude).arg(QChar(0xb0));
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}
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if (longitude >= 0) {
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lon = QString("%1%2E").arg(longitude).arg(QChar(0xb0));
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} else {
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lon = QString("%1%2W").arg(-longitude).arg(QChar(0xb0));
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}
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return QString("%1 %2").arg(lat).arg(lon);
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}
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void DSCMessage::decode(const QByteArray& data)
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{
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int idx = 0;
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// Format specifier
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m_formatSpecifier = (FormatSpecifier) data[idx++];
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m_formatSpecifierMatch = m_formatSpecifier == data[idx++];
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// Address and category
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if (m_formatSpecifier != DISTRESS_ALERT)
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{
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if (m_formatSpecifier != ALL_SHIPS)
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{
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m_address = symbolsToDigits(data, idx, 5);
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idx += 5;
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m_hasAddress = true;
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if (m_formatSpecifier == SELECTIVE_CALL)
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{
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m_address = formatAddress(m_address);
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}
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else if (m_formatSpecifier == GEOGRAPHIC_CALL)
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{
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// Address definines a geographic rectangle. We have NW coord + 2 angles
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QChar azimuthSector = m_address[0];
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m_addressLatitude = m_address[1].digitValue() * 10 + m_address[2].digitValue(); // In degrees
|
|
m_addressLongitude = m_address[3].digitValue() * 100 + m_address[4].digitValue() * 10 + m_address[5].digitValue(); // In degrees
|
|
switch (azimuthSector.toLatin1())
|
|
{
|
|
case '0': // NE
|
|
break;
|
|
case '1': // NW
|
|
m_addressLongitude = -m_addressLongitude;
|
|
break;
|
|
case '2': // SE
|
|
m_addressLatitude = -m_addressLatitude;
|
|
break;
|
|
case '3': // SW
|
|
m_addressLongitude = -m_addressLongitude;
|
|
m_addressLatitude = -m_addressLatitude;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
m_addressLatAngle = m_address[6].digitValue() * 10 + m_address[7].digitValue();
|
|
m_addressLonAngle = m_address[8].digitValue() * 10 + m_address[9].digitValue();
|
|
|
|
int latitude2 = m_addressLatitude + m_addressLatAngle;
|
|
int longitude2 = m_addressLongitude + m_addressLonAngle;
|
|
|
|
/*m_address = QString("Lat %2%1 Lon %3%1 %4%5%6%1 %4%7%8%1")
|
|
.arg(QChar(0xb0)) // degree
|
|
.arg(m_addressLatitude)
|
|
.arg(m_addressLongitude)
|
|
.arg(QChar(0x0394)) // delta
|
|
.arg(QChar(0x03C6)) // phi
|
|
.arg(m_addressLatAngle)
|
|
.arg(QChar(0x03BB)) // lambda
|
|
.arg(m_addressLonAngle);*/
|
|
m_address = QString("%1 - %2")
|
|
.arg(formatCoordinates(m_addressLatitude, m_addressLongitude))
|
|
.arg(formatCoordinates(latitude2, longitude2));
|
|
}
|
|
}
|
|
else
|
|
{
|
|
m_hasAddress = false;
|
|
}
|
|
m_category = (Category) data[idx++];
|
|
m_hasCategory = true;
|
|
}
|
|
else
|
|
{
|
|
m_hasAddress = false;
|
|
m_hasCategory = true;
|
|
}
|
|
|
|
// Self Id
|
|
m_selfId = symbolsToDigits(data, idx, 5);
|
|
m_selfId = formatAddress(m_selfId);
|
|
idx += 5;
|
|
|
|
// Telecommands
|
|
if (m_formatSpecifier != DISTRESS_ALERT)
|
|
{
|
|
m_telecommand1 = (FirstTelecommand) data[idx++];
|
|
m_hasTelecommand1 = true;
|
|
|
|
if (m_category != DISTRESS) // Not Distress Alert Ack / Relay
|
|
{
|
|
m_telecommand2 = (SecondTelecommand) data[idx++];
|
|
m_hasTelecommand2 = true;
|
|
}
|
|
else
|
|
{
|
|
m_hasTelecommand2 = false;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
m_hasTelecommand1 = false;
|
|
m_hasTelecommand2 = false;
|
|
}
|
|
|
|
// ID of source of distress for relays and acks
|
|
if (m_hasCategory && m_category == DISTRESS)
|
|
{
|
|
m_distressId = symbolsToDigits(data, idx, 5);
|
|
m_distressId = formatAddress(m_distressId);
|
|
idx += 5;
|
|
m_hasDistressId = true;
|
|
}
|
|
else
|
|
{
|
|
m_hasDistressId = false;
|
|
}
|
|
|
|
if (m_formatSpecifier == DISTRESS_ALERT)
|
|
{
|
|
m_distressNature = (DistressNature) data[idx++];
|
|
m_position = formatCoordinates(symbolsToDigits(data, idx, 5));
|
|
idx += 5;
|
|
m_hasDistressNature = true;
|
|
m_hasPosition = true;
|
|
|
|
m_hasFrequency1 = false;
|
|
m_hasChannel1 = false;
|
|
m_hasFrequency2 = false;
|
|
m_hasChannel2 = false;
|
|
}
|
|
else if (m_hasCategory && (m_category != DISTRESS))
|
|
{
|
|
m_hasDistressNature = false;
|
|
// Frequency or position
|
|
if (data[idx] == 55)
|
|
{
|
|
// Position 6
|
|
m_position = formatCoordinates(symbolsToDigits(data, idx, 5));
|
|
idx += 5;
|
|
m_hasPosition = true;
|
|
|
|
m_hasFrequency1 = false;
|
|
m_hasChannel1 = false;
|
|
m_hasFrequency2 = false;
|
|
m_hasChannel2 = false;
|
|
}
|
|
else
|
|
{
|
|
m_hasPosition = false;
|
|
// Frequency
|
|
m_frequency1 = 0;
|
|
decodeFrequency(data, idx, m_frequency1, m_channel1);
|
|
m_hasFrequency1 = m_frequency1 != 0;
|
|
m_hasChannel1 = !m_channel1.isEmpty();
|
|
|
|
if (m_formatSpecifier != AUTOMATIC_CALL)
|
|
{
|
|
m_frequency2 = 0;
|
|
decodeFrequency(data, idx, m_frequency2, m_channel2);
|
|
m_hasFrequency2 = m_frequency2 != 0;
|
|
m_hasChannel2 = !m_channel2.isEmpty();
|
|
}
|
|
else
|
|
{
|
|
m_hasFrequency2 = false;
|
|
m_hasChannel2 = false;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
m_hasDistressNature = false;
|
|
m_hasPosition = false;
|
|
m_hasFrequency1 = false;
|
|
m_hasChannel1 = false;
|
|
m_hasFrequency2 = false;
|
|
m_hasChannel2 = false;
|
|
}
|
|
|
|
if (m_formatSpecifier == AUTOMATIC_CALL)
|
|
{
|
|
signed char oddEven = data[idx++];
|
|
int len = data.size() - idx - 2; // EOS + ECC
|
|
m_number = symbolsToDigits(data, idx, len);
|
|
idx += len;
|
|
if (oddEven == 105) { // Is number an odd number?
|
|
m_number = m_number.mid(1); // Drop leading digit (which should be a 0)
|
|
}
|
|
m_hasNumber = true;
|
|
}
|
|
else
|
|
{
|
|
m_hasNumber = false;
|
|
}
|
|
|
|
// Time
|
|
if ( (m_formatSpecifier == DISTRESS_ALERT)
|
|
|| (m_hasCategory && (m_category == DISTRESS))
|
|
//|| (m_formatSpecifier == SELECTIVE_CALL) && (m_category == SAFETY) && (m_telecommand1 == POSITION_UPDATE) && (m_telecommand2 == 126) && (m_frequency == pos4))
|
|
)
|
|
{
|
|
// 8 8 8 8 for no time
|
|
QString time = symbolsToDigits(data, idx, 2);
|
|
if (time != "8888")
|
|
{
|
|
m_time = QTime(time.left(2).toInt(), time.right(2).toInt());
|
|
m_hasTime = true;
|
|
}
|
|
else
|
|
{
|
|
m_hasTime = false;
|
|
}
|
|
// FIXME: Convert to QTime?
|
|
}
|
|
else
|
|
{
|
|
m_hasTime = false;
|
|
}
|
|
|
|
// Subsequent communications
|
|
if ((m_formatSpecifier == DISTRESS_ALERT) || (m_hasCategory && (m_category == DISTRESS)))
|
|
{
|
|
m_subsequenceComms = (FirstTelecommand)data[idx++];
|
|
m_hasSubsequenceComms = true;
|
|
}
|
|
else
|
|
{
|
|
m_hasSubsequenceComms = false;
|
|
}
|
|
|
|
m_eos = (EndOfSignal) data[idx++];
|
|
m_ecc = data[idx++];
|
|
|
|
checkECC(data);
|
|
|
|
// Indicate message as being invalid if any unexpected data, too long, or ECC didn't match
|
|
if ( m_formatSpecifierStrings.contains(m_formatSpecifier)
|
|
&& (!m_hasCategory || (m_hasCategory && m_categoryStrings.contains(m_category)))
|
|
&& (!m_hasTelecommand1 || (m_hasTelecommand1 && m_telecommand1Strings.contains(m_telecommand1)))
|
|
&& (!m_hasTelecommand2 || (m_hasTelecommand2 && m_telecommand2Strings.contains(m_telecommand2)))
|
|
&& (!m_hasDistressNature || (m_hasDistressNature && m_distressNatureStrings.contains(m_distressNature)))
|
|
&& m_endOfSignalStrings.contains(m_eos)
|
|
&& (!data.contains(-1))
|
|
&& (data.size() < DSCDecoder::m_maxBytes)
|
|
&& m_eccOk
|
|
) {
|
|
m_valid = true;
|
|
} else {
|
|
m_valid = false;
|
|
}
|
|
|
|
}
|
|
|
|
void DSCMessage::checkECC(const QByteArray& data)
|
|
{
|
|
m_calculatedECC = 0;
|
|
// Only use one format specifier and one EOS
|
|
for (int i = 1; i < data.size() - 1; i++) {
|
|
m_calculatedECC ^= data[i];
|
|
}
|
|
m_eccOk = m_calculatedECC == m_ecc;
|
|
}
|
|
|
|
void DSCMessage::decodeFrequency(const QByteArray& data, int& idx, int& frequency, QString& channel)
|
|
{
|
|
// No frequency information is indicated by 126 repeated 3 times
|
|
if ((data[idx] == 126) && (data[idx+1] == 126) && (data[idx+2] == 126))
|
|
{
|
|
idx += 3;
|
|
return;
|
|
}
|
|
|
|
// Extract frequency digits
|
|
QString s = symbolsToDigits(data, idx, 3);
|
|
idx += 3;
|
|
if (s[0] == '4')
|
|
{
|
|
s = s.append(symbolsToDigits(data, idx, 1));
|
|
idx++;
|
|
}
|
|
|
|
if ((s[0] == '0') || (s[0] == '1') || (s[0] == '2'))
|
|
{
|
|
frequency = s.toInt() * 100;
|
|
}
|
|
else if (s[0] == '3')
|
|
{
|
|
channel = "CH" + s.mid(1); // HF/MF
|
|
}
|
|
else if (s[0] == '4')
|
|
{
|
|
frequency = s.mid(1).toInt() * 10; // Frequency in multiples of 10Hz
|
|
}
|
|
else if (s[0] == '9')
|
|
{
|
|
channel = "CH" + s.mid(2) + "VHF"; // VHF
|
|
}
|
|
}
|
|
|
|
QString DSCMessage::formatAddress(const QString &address) const
|
|
{
|
|
// First 9 digits should be MMSI
|
|
// Last digit should always be 0, except for ITU-R M.1080, which allows 10th digit to specify different equipement on same vessel
|
|
if (address.right(1) == "0") {
|
|
return address.left(9);
|
|
} else {
|
|
return QString("%1-%2").arg(address.left(9)).arg(address.right(1));
|
|
}
|
|
}
|
|
|
|
QString DSCMessage::formatCoordinates(const QString& coords)
|
|
{
|
|
if (coords == "9999999999")
|
|
{
|
|
return "Not available";
|
|
}
|
|
else
|
|
{
|
|
QChar quadrant = coords[0];
|
|
QString latitude = QString("%1%3%2\'")
|
|
.arg(coords.mid(1, 2))
|
|
.arg(coords.mid(3, 2))
|
|
.arg(QChar(0xb0));
|
|
QString longitude = QString("%1%3%2\'")
|
|
.arg(coords.mid(1, 3))
|
|
.arg(coords.mid(4, 2))
|
|
.arg(QChar(0xb0));
|
|
switch (quadrant.toLatin1())
|
|
{
|
|
case '0':
|
|
latitude = latitude.append('N');
|
|
longitude = longitude.append('E');
|
|
break;
|
|
case '1':
|
|
latitude = latitude.append('N');
|
|
longitude = longitude.append('W');
|
|
break;
|
|
case '2':
|
|
latitude = latitude.append('S');
|
|
longitude = longitude.append('E');
|
|
break;
|
|
case '3':
|
|
latitude = latitude.append('S');
|
|
longitude = longitude.append('W');
|
|
break;
|
|
}
|
|
return QString("%1 %2").arg(latitude).arg(longitude);
|
|
}
|
|
}
|
|
|
|
// Doesn't include 125 111 125 as these will have be detected already, in DSDDemodSink
|
|
const signed char DSCDecoder::m_expectedSymbols[] = {
|
|
110,
|
|
125, 109,
|
|
125, 108,
|
|
125, 107,
|
|
125, 106
|
|
};
|
|
|
|
int DSCDecoder::m_maxBytes = 40; // Max bytes in any message
|
|
|
|
void DSCDecoder::init(int offset)
|
|
{
|
|
if (offset == 0)
|
|
{
|
|
m_state = FILL_DX;
|
|
}
|
|
else
|
|
{
|
|
m_phaseIdx = offset;
|
|
m_state = PHASING;
|
|
}
|
|
m_idx = 0;
|
|
m_errors = 0;
|
|
m_bytes = QByteArray();
|
|
m_eos = false;
|
|
}
|
|
|
|
bool DSCDecoder::decodeSymbol(signed char symbol)
|
|
{
|
|
bool ret = false;
|
|
|
|
switch (m_state)
|
|
{
|
|
case PHASING:
|
|
// Check if received phasing signals are as expected
|
|
if (symbol != m_expectedSymbols[9-m_phaseIdx]) {
|
|
m_errors++;
|
|
}
|
|
m_phaseIdx--;
|
|
if (m_phaseIdx == 0) {
|
|
m_state = FILL_DX;
|
|
}
|
|
break;
|
|
|
|
case FILL_DX:
|
|
// Fill up buffer
|
|
m_buf[m_idx++] = symbol;
|
|
if (m_idx == BUFFER_SIZE)
|
|
{
|
|
m_state = RX;
|
|
m_idx = 0;
|
|
}
|
|
else
|
|
{
|
|
m_state = FILL_RX;
|
|
}
|
|
break;
|
|
|
|
case FILL_RX:
|
|
if ( ((m_idx == 1) && (symbol != 106))
|
|
|| ((m_idx == 2) && (symbol != 105))
|
|
)
|
|
{
|
|
m_errors++;
|
|
}
|
|
m_state = FILL_DX;
|
|
break;
|
|
|
|
case RX:
|
|
{
|
|
signed char a = selectSymbol(m_buf[m_idx], symbol);
|
|
|
|
if (DSCMessage::m_endOfSignalStrings.contains((DSCMessage::EndOfSignal) a)) {
|
|
m_state = DX_EOS;
|
|
} else {
|
|
m_state = DX;
|
|
}
|
|
|
|
if (m_bytes.size() > m_maxBytes)
|
|
{
|
|
ret = true;
|
|
m_state = NO_EOS;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case DX:
|
|
// Save received character in buffer
|
|
m_buf[m_idx] = symbol;
|
|
m_idx = (m_idx + 1) % BUFFER_SIZE;
|
|
m_state = RX;
|
|
break;
|
|
|
|
case DX_EOS:
|
|
// Save, EOS symbol
|
|
m_buf[m_idx] = symbol;
|
|
m_idx = (m_idx + 1) % BUFFER_SIZE;
|
|
m_state = RX_EOS;
|
|
break;
|
|
|
|
case RX_EOS:
|
|
selectSymbol(m_buf[m_idx], symbol);
|
|
m_state = DONE;
|
|
ret = true;
|
|
break;
|
|
|
|
case DONE:
|
|
case NO_EOS:
|
|
break;
|
|
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
// Reverse order of bits in a byte
|
|
unsigned char DSCDecoder::reverse(unsigned char b)
|
|
{
|
|
b = (b & 0xF0) >> 4 | (b & 0x0F) << 4;
|
|
b = (b & 0xCC) >> 2 | (b & 0x33) << 2;
|
|
b = (b & 0xAA) >> 1 | (b & 0x55) << 1;
|
|
return b;
|
|
}
|
|
|
|
// Convert 10 bits to a symbol
|
|
// Returns -1 if error detected
|
|
signed char DSCDecoder::bitsToSymbol(unsigned int bits)
|
|
{
|
|
signed char data = reverse(bits >> 3) >> 1;
|
|
int zeros = 7-popcount(data);
|
|
int expectedZeros = bits & 0x7;
|
|
if (zeros == expectedZeros) {
|
|
return data;
|
|
} else {
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
// Decode 10-bits to symbols then remove errors using repeated symbols
|
|
bool DSCDecoder::decodeBits(int bits)
|
|
{
|
|
signed char symbol = bitsToSymbol(bits);
|
|
//qDebug() << "Bits2sym: " << Qt::hex << bits << Qt::hex << symbol;
|
|
return decodeSymbol(symbol);
|
|
}
|
|
|
|
// Select time diversity symbol without errors
|
|
signed char DSCDecoder::selectSymbol(signed char dx, signed char rx)
|
|
{
|
|
signed char s;
|
|
if (dx != -1)
|
|
{
|
|
s = dx; // First received character has no detectable error
|
|
if (dx != rx) {
|
|
m_errors++;
|
|
}
|
|
}
|
|
else if (rx != -1)
|
|
{
|
|
s = rx; // Second received character has no detectable error
|
|
m_errors++;
|
|
}
|
|
else
|
|
{
|
|
s = '*'; // Both received characters have errors
|
|
m_errors += 2;
|
|
}
|
|
m_bytes.append(s);
|
|
|
|
return s;
|
|
}
|