Fix crash on startup X server is not available (#895)

CHANGELOG.md

@@ -76,6 +76,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Decrease compile time (#886)
 - Fix some data synchronization error (#890)
 - Fix Qt screenhot crash (#889)
+- Fix crash on startup if no X server available (#892)
 - Fix RPC restart of Hyperion (#894)
 
 ### Removed

include/grabber/V4L2Wrapper.h

@@ -32,6 +32,7 @@ public slots:
 	void setCecDetectionEnable(bool enable);
 	void setDeviceVideoStandard(QString device, VideoStandard videoStandard);
 	void handleCecEvent(CECEvent event);
+	void handleSettingsUpdate(const settings::type& type, const QJsonDocument& config) override;
 
 private slots:
 	void newFrame(const Image<ColorRgb> & image);

include/hyperion/GrabberWrapper.h

@@ -51,6 +51,11 @@ public:
 	///
 	virtual void stop();
 
+	///
+	/// Check if grabber is active
+	///
+	virtual bool isActive() const;
+
 	///
 	/// @brief Get a list of all available V4L devices
 	/// @return List of all available V4L devices on success else empty List
@@ -146,6 +151,12 @@ private slots:
 	/// Will start and stop grabber based on active listeners count
 	void handleSourceRequest(const hyperion::Components& component, const int hyperionInd, const bool listen);
 
+	///
+	/// @brief Update Update capture rate
+	/// @param type   interval between frames in millisecons
+	///
+	void updateTimer(int interval);
+
 protected:
 	QString _grabberName;
 

libsrc/grabber/v4l2/V4L2Wrapper.cpp

@@ -109,3 +109,48 @@ void V4L2Wrapper::handleCecEvent(CECEvent event)
 {
 	_grabber.handleCecEvent(event);
 }
+
+void V4L2Wrapper::handleSettingsUpdate(const settings::type& type, const QJsonDocument& config)
+{
+	if(type == settings::V4L2 && _grabberName.startsWith("V4L"))
+	{
+		// extract settings
+		const QJsonObject& obj = config.object();
+
+		// pixel decimation for v4l
+		_grabber.setPixelDecimation(obj["sizeDecimation"].toInt(8));
+
+		// crop for v4l
+		_grabber.setCropping(
+			obj["cropLeft"].toInt(0),
+			obj["cropRight"].toInt(0),
+			obj["cropTop"].toInt(0),
+			obj["cropBottom"].toInt(0));
+
+		// device input
+		_grabber.setInput(obj["input"].toInt(-1));
+
+		// device resolution
+		_grabber.setWidthHeight(obj["width"].toInt(0), obj["height"].toInt(0));
+
+		// device framerate
+		_grabber.setFramerate(obj["fps"].toInt(15));
+
+		// CEC Standby
+		_grabber.setCecDetectionEnable(obj["cecDetection"].toBool(true));
+
+		_grabber.setSignalDetectionEnable(obj["signalDetection"].toBool(true));
+		_grabber.setSignalDetectionOffset(
+			obj["sDHOffsetMin"].toDouble(0.25),
+			obj["sDVOffsetMin"].toDouble(0.25),
+			obj["sDHOffsetMax"].toDouble(0.75),
+			obj["sDVOffsetMax"].toDouble(0.75));
+		_grabber.setSignalThreshold(
+			obj["redSignalThreshold"].toDouble(0.0)/100.0,
+			obj["greenSignalThreshold"].toDouble(0.0)/100.0,
+			obj["blueSignalThreshold"].toDouble(0.0)/100.0);
+		_grabber.setDeviceVideoStandard(
+			obj["device"].toString("auto"),
+			parseVideoStandard(obj["standard"].toString("no-change")));
+	}
+}

libsrc/grabber/x11/X11Wrapper.cpp

@@ -25,8 +25,11 @@ void X11Wrapper::action()
 		}
 	}
 
+	if (isActive())
+	{
 		if (_grabber.updateScreenDimensions() >= 0 )
 		{
 			transferFrame(_grabber);
 		}
+	}
 }

libsrc/hyperion/GrabberWrapper.cpp

@@ -61,6 +61,11 @@ void GrabberWrapper::stop()
 	}
 }
 
+bool GrabberWrapper::isActive() const
+{
+	return _timer->isActive();
+}
+
 QStringList GrabberWrapper::availableGrabbers()
 {
 	QStringList grabbers;
@@ -110,15 +115,28 @@ void GrabberWrapper::setCropping(unsigned cropLeft, unsigned cropRight, unsigned
 	_ggrabber->setCropping(cropLeft, cropRight, cropTop, cropBottom);
 }
 
+void GrabberWrapper::updateTimer(int interval)
+{
+	if(_updateInterval_ms != interval)
+	{
+		_updateInterval_ms = interval;
+
+		const bool& timerWasActive = _timer->isActive();
+		_timer->stop();
+		_timer->setInterval(_updateInterval_ms);
+
+		if(timerWasActive)
+			_timer->start();
+	}
+}
+
 void GrabberWrapper::handleSettingsUpdate(const settings::type& type, const QJsonDocument& config)
 {
-	if(type == settings::V4L2 || type == settings::SYSTEMCAPTURE)
+	if(type == settings::SYSTEMCAPTURE && !_grabberName.startsWith("V4L"))
 	{
 		// extract settings
 		const QJsonObject& obj = config.object();
 
-		if(type == settings::SYSTEMCAPTURE  && !_grabberName.startsWith("V4L"))
-		{
 		// width/height
 		_ggrabber->setWidthHeight(obj["width"].toInt(96), obj["height"].toInt(96));
 
@@ -138,57 +156,8 @@ void GrabberWrapper::handleSettingsUpdate(const settings::type& type, const QJso
 			obj["cropTop"].toInt(0),
 			obj["cropBottom"].toInt(0));
 
-			// eval new update timer (not for v4l)
-			if(_updateInterval_ms != 1000/obj["frequency_Hz"].toInt(10))
-			{
-				_updateInterval_ms = 1000/obj["frequency_Hz"].toInt(10);
-				const bool& timerWasActive = _timer->isActive();
-				_timer->stop();
-				_timer->setInterval(_updateInterval_ms);
-				if(timerWasActive)
-					_timer->start();
-			}
-		}
-
-		// v4l instances only!
-		if(type == settings::V4L2 && _grabberName.startsWith("V4L"))
-		{
-			// pixel decimation for v4l
-			_ggrabber->setPixelDecimation(obj["sizeDecimation"].toInt(8));
-
-			// crop for v4l
-			_ggrabber->setCropping(
-				obj["cropLeft"].toInt(0),
-				obj["cropRight"].toInt(0),
-				obj["cropTop"].toInt(0),
-				obj["cropBottom"].toInt(0));
-
-			// device input
-			_ggrabber->setInput(obj["input"].toInt(-1));
-
-			// device resolution
-			_ggrabber->setWidthHeight(obj["width"].toInt(0), obj["height"].toInt(0));
-
-			// device framerate
-			_ggrabber->setFramerate(obj["fps"].toInt(15));
-
-			// CEC Standby
-			_ggrabber->setCecDetectionEnable(obj["cecDetection"].toBool(true));
-
-			_ggrabber->setSignalDetectionEnable(obj["signalDetection"].toBool(true));
-			_ggrabber->setSignalDetectionOffset(
-				obj["sDHOffsetMin"].toDouble(0.25),
-				obj["sDVOffsetMin"].toDouble(0.25),
-				obj["sDHOffsetMax"].toDouble(0.75),
-				obj["sDVOffsetMax"].toDouble(0.75));
-			_ggrabber->setSignalThreshold(
-				obj["redSignalThreshold"].toDouble(0.0)/100.0,
-				obj["greenSignalThreshold"].toDouble(0.0)/100.0,
-				obj["blueSignalThreshold"].toDouble(0.0)/100.0);
-			_ggrabber->setDeviceVideoStandard(
-				obj["device"].toString("auto"),
-				parseVideoStandard(obj["standard"].toString("no-change")));
-		}
+		// eval new update time
+		updateTimer(1000/obj["frequency_Hz"].toInt(10));
 	}
 }
 

libsrc/utils/Logger.cpp

@@ -128,12 +128,13 @@ Logger::Logger (const QString & name, LogLevel minLevel)
 {
 	qRegisterMetaType<Logger::T_LOG_MESSAGE>();
 
-	int count = LoggerCount.fetchAndAddOrdered(1);
-
-	if (_syslogEnabled && count == 1)
+	if (LoggerCount.fetchAndAddOrdered(1) == 1)
 	{
 #ifndef _WIN32
+		if (_syslogEnabled)
+		{
 			openlog (_appname.toLocal8Bit(), LOG_CONS | LOG_PID | LOG_NDELAY, LOG_LOCAL0);
+		}
 #endif
 	}
 }
@@ -142,11 +143,16 @@ Logger::~Logger()
 {
 	//Debug(this, "logger '%s' destroyed", QSTRING_CSTR(_name) );
 
-	int count = LoggerCount.fetchAndSubOrdered(1);
+
+	if (LoggerCount.fetchAndSubOrdered(1) == 0)
+	{
 #ifndef _WIN32
-	if (_syslogEnabled && count == 0)
+		if (_syslogEnabled)
+		{
 			closelog();
+		}
 #endif
+	}
 }
 
 void Logger::write(const Logger::T_LOG_MESSAGE & message) const