Web API: fixed segfault when mixing start/stop between GUI and API. Applied to BladeRF input, SDRdaemon input and SDRPlay

plugins/samplesource/sdrplay/sdrplaygui.cpp

@@ -33,6 +33,7 @@ SDRPlayGui::SDRPlayGui(DeviceUISet *deviceUISet, QWidget* parent) :
     QWidget(parent),
     ui(new Ui::SDRPlayGui),
     m_deviceUISet(deviceUISet),
+    m_doApplySettings(true),
     m_forceSettings(true)
 {
     m_sampleSource = (SDRPlayInput*) m_deviceUISet->m_deviceSourceAPI->getSampleSource();
@@ -163,6 +164,15 @@ bool SDRPlayGui::handleMessage(const Message& message)
 
         return true;
     }
+    else if (SDRPlayInput::MsgStartStop::match(message))
+    {
+        SDRPlayInput::MsgStartStop& notif = (SDRPlayInput::MsgStartStop&) message;
+        blockApplySettings(true);
+        ui->startStop->setChecked(notif.getStartStop());
+        blockApplySettings(false);
+
+        return true;
+    }
     else
     {
         return false;
@@ -433,18 +443,10 @@ void SDRPlayGui::on_gainBaseband_valueChanged(int value)
 
 void SDRPlayGui::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();
+        SDRPlayInput::MsgStartStop *message = SDRPlayInput::MsgStartStop::create(checked);
+        m_sampleSource->getInputMessageQueue()->push(message);
     }
 }
 

plugins/samplesource/sdrplay/sdrplaygui.h

@@ -57,6 +57,7 @@ private:
     Ui::SDRPlayGui* ui;
 
     DeviceUISet* m_deviceUISet;
+    bool m_doApplySettings;
     bool m_forceSettings;
     SDRPlaySettings m_settings;
     QTimer m_updateTimer;
@@ -67,6 +68,7 @@ private:
     int m_lastEngineState;
     MessageQueue m_inputMessageQueue;
 
+    void blockApplySettings(bool block) { m_doApplySettings = !block; }
     void displaySettings();
     void sendSettings();
     void updateSampleRateAndFrequency();

plugins/samplesource/sdrplay/sdrplayinput.cpp

@@ -16,6 +16,7 @@
 
 #include <string.h>
 #include <errno.h>
+#include <unistd.h>
 #include <QDebug>
 
 #include "SWGDeviceSettings.h"
@@ -35,6 +36,7 @@
 MESSAGE_CLASS_DEFINITION(SDRPlayInput::MsgConfigureSDRPlay, Message)
 MESSAGE_CLASS_DEFINITION(SDRPlayInput::MsgReportSDRPlayGains, Message)
 MESSAGE_CLASS_DEFINITION(SDRPlayInput::MsgFileRecord, Message)
+MESSAGE_CLASS_DEFINITION(SDRPlayInput::MsgStartStop, Message)
 
 SDRPlayInput::SDRPlayInput(DeviceSourceAPI *deviceAPI) :
     m_deviceAPI(deviceAPI),
@@ -256,6 +258,27 @@ bool SDRPlayInput::handleMessage(const Message& message)
 
         return true;
     }
+    else if (MsgStartStop::match(message))
+    {
+        MsgStartStop& cmd = (MsgStartStop&) message;
+        qDebug() << "SDRPlayInput::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;
@@ -582,19 +605,16 @@ int SDRPlayInput::webapiRun(
         SWGSDRangel::SWGDeviceState& response,
         QString& errorMessage __attribute__((unused)))
 {
-    if (run)
+    MsgStartStop *message = MsgStartStop::create(run);
+    m_inputMessageQueue.push(message);
+
+    if (m_guiMessageQueue) // forward to GUI if any
     {
-        if (m_deviceAPI->initAcquisition())
-        {
-            m_deviceAPI->startAcquisition();
-            DSPEngine::instance()->startAudioOutputImmediate();
-        }
-    }
-    else
-    {
-        m_deviceAPI->stopAcquisition();
+        MsgStartStop *msgToGUI = MsgStartStop::create(run);
+        m_guiMessageQueue->push(msgToGUI);
     }
 
+    usleep(100000);
     m_deviceAPI->getDeviceEngineStateStr(*response.getState());
     return 200;
 }

plugins/samplesource/sdrplay/sdrplayinput.h

@@ -101,6 +101,25 @@ 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)
+        { }
+    };
+
     SDRPlayInput(DeviceSourceAPI *deviceAPI);
     virtual ~SDRPlayInput();
     virtual void destroy();