Fix a nullptr dereference

Change-Id: I13c484d011b689d3df5d71944d722562181e36d7
Reviewed-by: Doris Verria <doris.verria@qt.io>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

3 files changed, 13 insertions, 4 deletions

diff --git a/examples/multimedia/video/qmlvideo/Info.plist.in b/examples/multimedia/video/qmlvideo/Info.plist.in
index daa641fb7..85aa9c26e 100644
--- a/examples/multimedia/video/qmlvideo/Info.plist.in
+++ b/examples/multimedia/video/qmlvideo/Info.plist.in
@@ -42,7 +42,6 @@
         <string>Qt Multimedia Example</string>
         <key>NSMicrophoneUsageDescription</key>
         <string>Qt Multimedia Example</string>
-
 	<key>NSSupportsAutomaticGraphicsSwitching</key>
 	<true/>
 </dict>
diff --git a/examples/multimedia/video/qmlvideo/qml/qmlvideo/CameraItem.qml b/examples/multimedia/video/qmlvideo/qml/qmlvideo/CameraItem.qml
index 8fd79c3c5..5488439f7 100644
--- a/examples/multimedia/video/qmlvideo/qml/qmlvideo/CameraItem.qml
+++ b/examples/multimedia/video/qmlvideo/qml/qmlvideo/CameraItem.qml
@@ -72,6 +72,15 @@ VideoOutput {
                 }
             }
         }
+        imageCapture: ImageCapture {
+            id: imageCapture
+        }
+
+        encoder: MediaEncoder {
+            id: encoder
+//             resolution: "640x480"
+//             frameRate: 30
+        }
         videoOutput: root
     }
 
diff --git a/src/multimedia/platform/darwin/camera/avfmediaencoder.mm b/src/multimedia/platform/darwin/camera/avfmediaencoder.mm
index 62d72dd93..69362f197 100644
--- a/src/multimedia/platform/darwin/camera/avfmediaencoder.mm
+++ b/src/multimedia/platform/darwin/camera/avfmediaencoder.mm
@@ -385,8 +385,6 @@ void AVFMediaEncoder::applySettings()
     auto encoderSettings = m_settings;
     encoderSettings.resolveFormat();
 
-    const AVFConfigurationLock lock(session->videoCaptureDevice()); // prevents activeFormat from being overridden
-
     // audio settings
     m_audioSettings = avfAudioSettings(encoderSettings);
     if (m_audioSettings)
@@ -394,7 +392,10 @@ void AVFMediaEncoder::applySettings()
 
     // video settings
     AVCaptureDevice *device = m_service->session()->videoCaptureDevice();
-    AVCaptureConnection *conn = [m_service->session()->videoOutput()->videoDataOutput() connectionWithMediaType:AVMediaTypeVideo];
+    if (!device)
+        return;
+    const AVFConfigurationLock lock(device); // prevents activeFormat from being overridden
+   AVCaptureConnection *conn = [m_service->session()->videoOutput()->videoDataOutput() connectionWithMediaType:AVMediaTypeVideo];
     m_videoSettings = avfVideoSettings(encoderSettings, device, conn);
     if (m_videoSettings)
         [m_videoSettings retain];