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

plugins/samplesource/filesource/filesourcegui.cpp

@@ -179,6 +179,15 @@ bool FileSourceGui::handleMessage(const Message& message)
 		updateWithStreamTime();
 		return true;
 	}
+	else if (FileSourceInput::MsgStartStop::match(message))
+    {
+	    FileSourceInput::MsgStartStop& notif = (FileSourceInput::MsgStartStop&) message;
+        blockApplySettings(true);
+        ui->startStop->setChecked(notif.getStartStop());
+        blockApplySettings(false);
+
+        return true;
+    }
 	else
 	{
 		return false;
@@ -207,18 +216,10 @@ void FileSourceGui::on_playLoop_toggled(bool checked __attribute__((unused)))
 
 void FileSourceGui::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();
+        FileSourceInput::MsgStartStop *message = FileSourceInput::MsgStartStop::create(checked);
+        m_sampleSource->getInputMessageQueue()->push(message);
     }
 }
 

plugins/samplesource/filesource/filesourcegui.h

@@ -55,6 +55,7 @@ private:
 
 	DeviceUISet* m_deviceUISet;
 	FileSourceInput::Settings m_settings;
+	bool m_doApplySettings;
 	QTimer m_statusTimer;
 	std::vector<int> m_gains;
 	DeviceSampleSource* m_sampleSource;
@@ -72,6 +73,7 @@ private:
 	int m_lastEngineState;
 	MessageQueue m_inputMessageQueue;
 
+	void blockApplySettings(bool block) { m_doApplySettings = !block; }
 	void displaySettings();
 	void displayTime();
 	void sendSettings();

plugins/samplesource/filesource/filesourceinput.cpp

@@ -36,6 +36,7 @@ MESSAGE_CLASS_DEFINITION(FileSourceInput::MsgConfigureFileSourceName, Message)
 MESSAGE_CLASS_DEFINITION(FileSourceInput::MsgConfigureFileSourceWork, Message)
 MESSAGE_CLASS_DEFINITION(FileSourceInput::MsgConfigureFileSourceSeek, Message)
 MESSAGE_CLASS_DEFINITION(FileSourceInput::MsgConfigureFileSourceStreamTiming, Message)
+MESSAGE_CLASS_DEFINITION(FileSourceInput::MsgStartStop, Message)
 MESSAGE_CLASS_DEFINITION(FileSourceInput::MsgReportFileSourceAcquisition, Message)
 MESSAGE_CLASS_DEFINITION(FileSourceInput::MsgReportFileSourceStreamData, Message)
 MESSAGE_CLASS_DEFINITION(FileSourceInput::MsgReportFileSourceStreamTiming, Message)
@@ -288,6 +289,27 @@ bool FileSourceInput::handleMessage(const Message& message)
 
 		return true;
 	}
+    else if (MsgStartStop::match(message))
+    {
+        MsgStartStop& cmd = (MsgStartStop&) message;
+        qDebug() << "FileSourceInput::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
 	{
 		return false;

plugins/samplesource/filesource/filesourceinput.h

@@ -155,6 +155,25 @@ 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 MsgReportFileSourceStreamData : public Message {
 		MESSAGE_CLASS_DECLARATION