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

plugins/samplesource/fcdpro/fcdprogui.cpp

@@ -210,7 +210,19 @@ bool FCDProGui::deserialize(const QByteArray& data)
 
 bool FCDProGui::handleMessage(const Message& message __attribute__((unused)))
 {
-	return false;
+    if (BladerfInput::MsgStartStop::match(message))
+    {
+        BladerfInput::MsgStartStop& notif = (BladerfInput::MsgStartStop&) message;
+        blockApplySettings(true);
+        ui->startStop->setChecked(notif.getStartStop());
+        blockApplySettings(false);
+
+        return true;
+    }
+    else
+    {
+        return false;
+    }
 }
 
 void FCDProGui::handleInputMessages()
@@ -435,18 +447,10 @@ void FCDProGui::on_setDefaults_clicked(bool checked __attribute__((unused)))
 
 void FCDProGui::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/fcdpro/fcdprogui.h

@@ -55,6 +55,7 @@ private:
 	Ui::FCDProGui* ui;
 
 	DeviceUISet* m_deviceUISet;
+	bool m_doApplySettings;
 	bool m_forceSettings;
 	FCDProSettings m_settings;
 	QTimer m_updateTimer;
@@ -66,6 +67,7 @@ private:
 	int m_lastEngineState;
 	MessageQueue m_inputMessageQueue;
 
+	void blockApplySettings(bool block) { m_doApplySettings = !block; }
 	void displaySettings();
 	void sendSettings();
 	void updateSampleRateAndFrequency();

plugins/samplesource/fcdpro/fcdproinput.cpp

@@ -34,6 +34,7 @@
 #include "fcdproconst.h"
 
 MESSAGE_CLASS_DEFINITION(FCDProInput::MsgConfigureFCD, Message)
+MESSAGE_CLASS_DEFINITION(FCDProInput::MsgStartStop, Message)
 MESSAGE_CLASS_DEFINITION(FCDProInput::MsgFileRecord, Message)
 
 FCDProInput::FCDProInput(DeviceSourceAPI *deviceAPI) :
@@ -178,6 +179,27 @@ bool FCDProInput::handleMessage(const Message& message)
 		applySettings(conf.getSettings(), conf.getForce());
 		return true;
 	}
+    else if (MsgStartStop::match(message))
+    {
+        MsgStartStop& cmd = (MsgStartStop&) message;
+        qDebug() << "FCDProInput::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/fcdpro/fcdproinput.h

@@ -78,6 +78,25 @@ 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)
+        { }
+    };
+
 	FCDProInput(DeviceSourceAPI *deviceAPI);
 	virtual ~FCDProInput();
 	virtual void destroy();