GStreamer: print a warning when the camerabin plugin is missing

Don't create the camera service when the camerabin plugin is not
available on the system and print a warning.

Task-number: QTBUG-50775
Change-Id: I56c7e6297bebe4b90596cb3c0323f1d38231bceb
Reviewed-by: Christian Stromme <christian.stromme@qt.io>

1 files changed, 12 insertions, 1 deletions

diff --git a/src/plugins/gstreamer/camerabin/camerabinserviceplugin.cpp b/src/plugins/gstreamer/camerabin/camerabinserviceplugin.cpp
index bee81a953..0658b0af0 100644
--- a/src/plugins/gstreamer/camerabin/camerabinserviceplugin.cpp
+++ b/src/plugins/gstreamer/camerabin/camerabinserviceplugin.cpp
@@ -60,8 +60,19 @@ QMediaService* CameraBinServicePlugin::create(const QString &key)
 {
     QGstUtils::initializeGst();
 
-    if (key == QLatin1String(Q_MEDIASERVICE_CAMERA))
+    if (key == QLatin1String(Q_MEDIASERVICE_CAMERA)) {
+        if (!CameraBinService::isCameraBinAvailable()) {
+            guint major, minor, micro, nano;
+            gst_version(&major, &minor, &micro, &nano);
+            qWarning("Error: cannot create camera service, the 'camerabin' plugin is missing for "
+                     "GStreamer %u.%u."
+                     "\nPlease install the 'bad' GStreamer plugin package.",
+                     major, minor);
+            return Q_NULLPTR;
+        }
+
         return new CameraBinService(sourceFactory());
+    }
 
     qWarning() << "Gstreamer camerabin service plugin: unsupported key:" << key;
     return 0;