Web API: use message passing to start/stop device for all the rest of device plugins

plugins/samplesource/fcdproplus/fcdproplusgui.cpp

@@ -128,7 +128,19 @@ bool FCDProPlusGui::deserialize(const QByteArray& data)
 
 bool FCDProPlusGui::handleMessage(const Message& message __attribute__((unused)))
 {
-	return false;
+    if (FCDProPlusInput::MsgStartStop::match(message))
+    {
+        FCDProPlusInput::MsgStartStop& notif = (FCDProPlusInput::MsgStartStop&) message;
+        blockApplySettings(true);
+        ui->startStop->setChecked(notif.getStartStop());
+        blockApplySettings(false);
+
+        return true;
+    }
+    else
+    {
+        return false;
+    }
 }
 
 void FCDProPlusGui::handleInputMessages()
@@ -300,18 +312,10 @@ void FCDProPlusGui::on_ppm_valueChanged(int value)
 
 void FCDProPlusGui::on_startStop_toggled(bool checked)
 {
-    if (checked)
+    if (m_doApplySettings)
     {
-        if (m_deviceUISet->m_deviceSourceAPI->initAcquisition())
-        {
-            m_deviceUISet->m_deviceSourceAPI->startAcquisition();
-            DSPEngine::instance()->startAudioOutput();
-        }
-    }
-    else
-    {
-        m_deviceUISet->m_deviceSourceAPI->stopAcquisition();
-        DSPEngine::instance()->stopAudioOutput();
+        BladerfInput::MsgStartStop *message = BladerfInput::MsgStartStop::create(checked);
+        m_sampleSource->getInputMessageQueue()->push(message);
     }
 }
 

plugins/samplesource/fcdproplus/fcdproplusgui.h

@@ -54,6 +54,7 @@ private:
 	Ui::FCDProPlusGui* ui;
 
 	DeviceUISet* m_deviceUISet;
+	bool m_doApplySettings;
 	bool m_forceSettings;
 	FCDProPlusSettings m_settings;
 	QTimer m_updateTimer;
@@ -65,6 +66,7 @@ private:
 	int m_lastEngineState;
 	MessageQueue m_inputMessageQueue;
 
+	void blockApplySettings(bool block) { m_doApplySettings = !block; }
 	void displaySettings();
 	void sendSettings();
 	void updateSampleRateAndFrequency();

plugins/samplesource/fcdproplus/fcdproplusinput.cpp

@@ -33,6 +33,7 @@
 #include "fcdproplusconst.h"
 
 MESSAGE_CLASS_DEFINITION(FCDProPlusInput::MsgConfigureFCD, Message)
+MESSAGE_CLASS_DEFINITION(FCDProPlusInput::MsgStartStop, Message)
 MESSAGE_CLASS_DEFINITION(FCDProPlusInput::MsgFileRecord, Message)
 
 FCDProPlusInput::FCDProPlusInput(DeviceSourceAPI *deviceAPI) :
@@ -172,6 +173,27 @@ bool FCDProPlusInput::handleMessage(const Message& message)
 		applySettings(conf.getSettings(), conf.getForce());
 		return true;
 	}
+    else if (MsgStartStop::match(message))
+    {
+        MsgStartStop& cmd = (MsgStartStop&) message;
+        qDebug() << "BladerfInput::handleMessage: MsgStartStop: " << (cmd.getStartStop() ? "start" : "stop");
+
+        if (cmd.getStartStop())
+        {
+            if (m_deviceAPI->initAcquisition())
+            {
+                m_deviceAPI->startAcquisition();
+                DSPEngine::instance()->startAudioOutput();
+            }
+        }
+        else
+        {
+            m_deviceAPI->stopAcquisition();
+            DSPEngine::instance()->stopAudioOutput();
+        }
+
+        return true;
+    }
     else if (MsgFileRecord::match(message))
     {
         MsgFileRecord& conf = (MsgFileRecord&) message;

plugins/samplesource/fcdproplus/fcdproplusinput.h

@@ -58,6 +58,25 @@ public:
 		{ }
 	};
 
+    class MsgStartStop : public Message {
+        MESSAGE_CLASS_DECLARATION
+
+    public:
+        bool getStartStop() const { return m_startStop; }
+
+        static MsgStartStop* create(bool startStop) {
+            return new MsgStartStop(startStop);
+        }
+
+    protected:
+        bool m_startStop;
+
+        MsgStartStop(bool startStop) :
+            Message(),
+            m_startStop(startStop)
+        { }
+    };
+
     class MsgFileRecord : public Message {
         MESSAGE_CLASS_DECLARATION