Device source plugins: implemented an init method for initializations to be done when all collaborating objects are created and possibly connected

plugins/samplesource/rtlsdr/rtlsdrinput.cpp

@@ -173,6 +173,11 @@ bool RTLSDRInput::openDevice()
     return true;
 }
 
+void RTLSDRInput::init()
+{
+    applySettings(m_settings, true);
+}
+
 bool RTLSDRInput::start()
 {
 	QMutexLocker mutexLocker(&m_mutex);

plugins/samplesource/rtlsdr/rtlsdrinput.h

@@ -95,6 +95,7 @@ public:
 	virtual ~RTLSDRInput();
 	virtual void destroy();
 
+	virtual void init();
 	virtual bool start();
 	virtual void stop();