Fix UVC handling

src/FlightDisplay/FlightDisplayViewUVC.qml

@@ -13,12 +13,34 @@ import QtMultimedia             5.5
 import QGroundControl           1.0
 
 Rectangle {
-    anchors.fill:       parent
+    id:                 _root
+    width:              parent.width
+    height:             parent.height
+    anchors.centerIn:   parent
     color:              Qt.rgba(0,0,0,0.75)
+
+    function adjustAspectRatio()
+    {
+        //-- Set aspect ratio
+        var size = camera.viewfinder.resolution
+        if(size.height > 0 && size.width > 0) {
+            var ar = size.width / size.height
+            _root.height = parent.height * ar
+        }
+    }
+
     Camera {
         id:             camera
         deviceId:       QGroundControl.videoManager.videoSourceID
         captureMode:    Camera.CaptureViewfinder
+        onDeviceIdChanged: {
+            adjustAspectRatio()
+        }
+        onCameraStateChanged: {
+            if(camera.cameraStatus === Camera.ActiveStatus) {
+                adjustAspectRatio()
+            }
+        }
     }
     VideoOutput {
         source:         camera

src/FlightDisplay/VideoManager.cc

@@ -65,15 +65,7 @@ VideoManager::setToolbox(QGCToolbox *toolbox)
 #if defined(QGC_GST_STREAMING)
 #ifndef QGC_DISABLE_UVC
    // If we are using a UVC camera setup the device name
-    QList<QCameraInfo> cameras = QCameraInfo::availableCameras();
-    for (const QCameraInfo &cameraInfo: cameras) {
-        if(cameraInfo.description() == videoSource) {
-            _videoSourceID = cameraInfo.deviceName();
-            emit videoSourceIDChanged();
-            qCDebug(VideoManagerLog) << "Found USB source:" << _videoSourceID << " Name:" << videoSource;
-            break;
-        }
-    }
+   _updateUVC();
 #endif
 
     emit isGStreamerChanged();
@@ -91,8 +83,27 @@ VideoManager::setToolbox(QGCToolbox *toolbox)
 
 //-----------------------------------------------------------------------------
 void
+VideoManager::_updateUVC()
+{
+#ifndef QGC_DISABLE_UVC
+    QString videoSource = _videoSettings->videoSource()->rawValue().toString();
+    QList<QCameraInfo> cameras = QCameraInfo::availableCameras();
+    for (const QCameraInfo &cameraInfo: cameras) {
+        if(cameraInfo.description() == videoSource) {
+            _videoSourceID = cameraInfo.deviceName();
+            emit videoSourceIDChanged();
+            qCDebug(VideoManagerLog) << "Found USB source:" << _videoSourceID << " Name:" << videoSource;
+            break;
+        }
+    }
+#endif
+}
+
+//-----------------------------------------------------------------------------
+void
 VideoManager::_videoSourceChanged()
 {
+    _updateUVC();
     emit hasVideoChanged();
     emit isGStreamerChanged();
     _restartVideo();

src/FlightDisplay/VideoManager.h

@@ -56,8 +56,8 @@ public:
     // Override from QGCTool
     void        setToolbox          (QGCToolbox *toolbox);
 
-    Q_INVOKABLE void startVideo() {_videoReceiver->start();};
-    Q_INVOKABLE void stopVideo() {_videoReceiver->stop();};
+    Q_INVOKABLE void startVideo()   {_videoReceiver->start();}
+    Q_INVOKABLE void stopVideo()    {_videoReceiver->stop(); }
 
 signals:
     void hasVideoChanged            ();
@@ -70,6 +70,7 @@ private slots:
     void _udpPortChanged            ();
     void _rtspUrlChanged            ();
     void _tcpUrlChanged             ();
+    void _updateUVC                 ();
 
 private:
     void _updateSettings            ();

src/Settings/VideoSettings.cc

@@ -32,7 +32,6 @@ DECLARE_SETTINGGROUP(Video, "Video")
     qmlRegisterUncreatableType<VideoSettings>("QGroundControl.SettingsManager", 1, 0, "VideoSettings", "Reference only");
 
     // Setup enum values for videoSource settings into meta data
-    bool noVideo = false;
     QStringList videoSourceList;
 #ifdef QGC_GST_STREAMING
 #ifndef NO_UDP_VIDEO
@@ -51,7 +50,7 @@ DECLARE_SETTINGGROUP(Video, "Video")
     }
 #endif
     if (videoSourceList.count() == 0) {
-        noVideo = true;
+        _noVideo = true;
         videoSourceList.append(videoSourceNoVideo);
     } else {
         videoSourceList.insert(0, videoDisabled);
@@ -63,7 +62,12 @@ DECLARE_SETTINGGROUP(Video, "Video")
     _nameToMetaDataMap[videoSourceName]->setEnumInfo(videoSourceList, videoSourceVarList);
 
     // Set default value for videoSource
-    if (noVideo) {
+    _setDefaults();
+}
+
+void VideoSettings::_setDefaults()
+{
+    if (_noVideo) {
         _nameToMetaDataMap[videoSourceName]->setRawDefaultValue(videoSourceNoVideo);
     } else {
         _nameToMetaDataMap[videoSourceName]->setRawDefaultValue(videoDisabled);
@@ -85,6 +89,14 @@ DECLARE_SETTINGSFACT_NO_FUNC(VideoSettings, videoSource)
 {
     if (!_videoSourceFact) {
         _videoSourceFact = _createSettingsFact(videoSourceName);
+        //-- Check for sources no longer available
+        if(!_nameToMetaDataMap.contains(_videoSourceFact->rawValue().toString())) {
+            if (_noVideo) {
+                _videoSourceFact->setRawValue(videoSourceNoVideo);
+            } else {
+                _videoSourceFact->setRawValue(videoDisabled);
+            }
+        }
         connect(_videoSourceFact, &Fact::valueChanged, this, &VideoSettings::_configChanged);
     }
     return _videoSourceFact;

src/Settings/VideoSettings.h

@@ -55,6 +55,11 @@ private slots:
     void _configChanged             (QVariant value);
 
 private:
+    void _setDefaults               ();
+
+private:
+    bool _noVideo = false;
+
 };
 
 #endif