mirror of
https://github.com/JS8Call-improved/JS8Call-improved
synced 2026-08-13 17:47:36 -04:00
307 lines
8.7 KiB
C++
307 lines
8.7 KiB
C++
#include "decodedtext.h"
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#include <QStringBuilder>
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#include <varicode.h>
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/******************************************************************************/
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// Constants
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/******************************************************************************/
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namespace
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{
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// Quality level below which we'll consider a decode to be suspect;
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// the UI will generally enclose the decode within [] characters to
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// denote it as being sketchy.
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constexpr auto QUALITY_THRESHOLD = 0.17f;
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}
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/******************************************************************************/
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// Local Routines
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/******************************************************************************/
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namespace
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{
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// Translation of standard submode IDs to their character equivalents.
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// this is only used when writing out to ALL.TXT, so we've defined it
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// here, but arguably it should be part of JS8::Submode or Varicode.
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QChar
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submodeChar(int const submode)
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{
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switch (submode)
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{
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case 0: return 'A';
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case 1: return 'B';
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case 2: return 'C';
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case 4: return 'E';
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case 8: return 'I';
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default: return '~';
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}
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}
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// Create and return a potentially compound call from the provided
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// parts; the parts are at this point guaranteed to be at least of
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// size 2, but any part might be empty.
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QString
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buildCompound(QStringList const & parts)
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{
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auto subset = parts.mid(0, 2);
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subset.removeAll("");
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return subset.join('/');
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}
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}
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/******************************************************************************/
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// Private Implementation
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/******************************************************************************/
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// Core constructor, called by the two public constructors.
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// Attempts to unpack, using the unpack strategies defined
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// in the order of the unpack strategies array, until one
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// of them works or all of them have failed.
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DecodedText::DecodedText(QString const & frame,
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int bits,
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int submode,
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bool isLowConfidence,
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int time,
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int frequencyOffset,
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float snr,
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float dt)
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: frameType_ (Varicode::FrameUnknown)
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, frame_ (frame)
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, isAlt_ (false)
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, isHeartbeat_ (false)
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, isLowConfidence_(isLowConfidence)
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, message_ (frame_)
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, bits_ (bits)
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, submode_ (submode)
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, time_ (time)
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, frequencyOffset_(frequencyOffset)
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, snr_ (snr)
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, dt_ (dt)
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{
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auto const m = message().trimmed();
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if (m.length() < 12 || m.contains(' ')) return;
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for (auto unpack : unpackStrategies)
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{
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if ((this->*unpack)(m)) break;
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}
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}
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bool
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DecodedText::tryUnpackFastData(QString const & m)
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{
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if ((bits_ & Varicode::JS8CallData) != Varicode::JS8CallData) return false;
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if (auto const data = Varicode::unpackFastDataMessage(m);
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data.isEmpty())
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{
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return false;
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}
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else
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{
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message_ = data;
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frameType_ = Varicode::FrameData;
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return true;
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}
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}
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bool
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DecodedText::tryUnpackData(QString const & m)
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{
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if ((bits_ & Varicode::JS8CallData) == Varicode::JS8CallData) return false;
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if (auto const data = Varicode::unpackDataMessage(m);
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data.isEmpty())
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{
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return false;
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}
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else
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{
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message_ = data;
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frameType_ = Varicode::FrameData;
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return true;
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}
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}
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bool
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DecodedText::tryUnpackHeartbeat(QString const & m)
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{
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if ((bits_ & Varicode::JS8CallData) == Varicode::JS8CallData) return false;
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bool isAlt = false;
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quint8 type = Varicode::FrameUnknown;
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quint8 bits3 = 0;
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auto const parts = Varicode::unpackHeartbeatMessage(m, &type, &isAlt, &bits3);
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if (parts.length() < 2) return false;
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// Heartbeat Alt Type
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// ------------------
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// 1 0 HB
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// 1 1 CQ
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frameType_ = type;
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isHeartbeat_ = true;
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isAlt_ = isAlt;
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extra_ = parts.value(2, QString());
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compound_ = buildCompound(parts);
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message_ = compound_ % ": ";
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if (isAlt)
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{
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message_ += "@ALLCALL " % Varicode::cqString(bits3);
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}
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else
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{
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auto const sbits3 = Varicode::hbString(bits3);
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message_ += "@HB " % (sbits3 == "HB" ? "HEARTBEAT" : sbits3);
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}
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message_ += ' ' % extra_ % ' ';
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return true;
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}
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bool
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DecodedText::tryUnpackCompound(QString const & m)
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{
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quint8 type = Varicode::FrameUnknown;
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quint8 bits3 = 0;
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auto const parts = Varicode::unpackCompoundMessage(m, &type, &bits3);
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if (parts.length() < 2 ||
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(bits_ & Varicode::JS8CallData) == Varicode::JS8CallData) return false;
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frameType_ = type;
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extra_ = parts.mid(2).join(' ');
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compound_ = buildCompound(parts);
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if (type == Varicode::FrameCompound)
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{
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message_ = compound_ % ": ";
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}
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else if (type == Varicode::FrameCompoundDirected)
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{
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message_ = compound_ % extra_ % ' ';
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directed_.reserve(parts.size() - 2 + 2);
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directed_ = { "<....>", compound_ };
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directed_ += parts.mid(2);
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}
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return true;
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}
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bool
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DecodedText::tryUnpackDirected(QString const & m)
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{
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if ((bits_ & Varicode::JS8CallData) == Varicode::JS8CallData) return false;
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quint8 type = Varicode::FrameUnknown;
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QStringList const parts = Varicode::unpackDirectedMessage(m, &type);
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if (parts.isEmpty()) return false;
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switch (parts.length())
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{
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case 3: // Directed message => "0: 12 "
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case 4: // Directed numeric message => "0: 12 3 "
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message_ = parts.at(0) % ": " % parts.at(1) % parts.mid(2).join(' ') % ' ';
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break;
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default: // Free text message
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message_ = parts.join("");
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break;
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}
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directed_ = parts;
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frameType_ = type;
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return true;
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}
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/******************************************************************************/
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// Public Implementation
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/******************************************************************************/
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// Main constructor, used to interpret Decoded events emitted by the JS8
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// decoder. This function used to be handled via parsing strings issued by
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// the Fortran decoder.
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//
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// Of note here is the quality check; that was present in the previous code,
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// but did not seem to be looking in the right place for the annotation that
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// the Fortran decoded emitted.
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DecodedText::DecodedText(JS8::Event::Decoded const & decoded)
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: DecodedText(QString::fromStdString(decoded.data),
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decoded.type,
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decoded.mode,
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decoded.quality < QUALITY_THRESHOLD,
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decoded.utc,
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decoded.frequency,
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decoded.snr,
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decoded.xdt)
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{}
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// Constructor used internally; we're basically taking advantage of the ability
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// of this class to unpack, and as such this probably doesn't belong here, but
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// keeping it aligned with the previous code for now.
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DecodedText::DecodedText(QString const & frame,
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int const bits,
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int const submode)
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: DecodedText(frame,
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bits,
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submode,
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false,
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0,
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0,
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0.0f,
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0.0f)
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{}
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// Simple word split for free text messages; preallocate memory for
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// efficiency; add whole message as item 0 to mimic regular expression
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// capture list.
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QStringList
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DecodedText::messageWords() const
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{
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QStringList words;
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words.reserve(message_.count(' ') + 2);
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words.append(message_);
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words.append(message_.split(' ', Qt::SkipEmptyParts));
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return words;
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}
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// Format as a string suitable for appending to ALL.TXT. Original
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// code has no space between time and SNR; matching that here.
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QString
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DecodedText::string() const
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{
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int const hours = time_ / 10000;
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int const minutes = (time_ / 100) % 100;
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int const seconds = time_ % 100;
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return QStringLiteral("%1:%2:%3%4 %5 %6 %7 %8 %9 ")
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.arg(hours, 2, 10, QChar('0')) // Right-aligned integer with 2 characters, padded with zeroes.
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.arg(minutes, 2, 10, QChar('0')) // Right-aligned integer with 2 characters, padded with zeroes.
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.arg(seconds, 2, 10, QChar('0')) // Right-aligned integer with 2 characters, padded with zeroes.
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.arg(snr_, 3, 10, QChar(' ')) // Right-aligned integer with 3 characters, padded with spaces
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.arg(dt_, 4, 'f', 1) // Right-aligned float with 1 decimal point
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.arg(frequencyOffset_, 4, 10, QChar(' ')) // Right-aligned integer with 4 characters, passed with spaces
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.arg(submodeChar(submode_)) // Single character
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.arg(frame_) // Fixed string, 12 characters
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.arg(bits_); // Single 3-bit integer
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}
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/******************************************************************************/
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