Enable error reporting when failed to initialize backend element

This patch adds an option to report error message when a backend
component cannot be instantiated. This error message is then
displayed in the console with qWarning and in some cases reported
to the app user with error signals. We need further improvements
on the error reporting side.

Additionally, this patch cleans up the code in the .cpp API
classes.

Pick-to: 6.4
Change-Id: Id39865cc8f1e9b52804bf5b9d9b15e738508f860
Reviewed-by: Lars Knoll <lars@knoll.priv.no>

1 files changed, 9 insertions, 9 deletions

diff --git a/src/plugins/multimedia/gstreamer/qgstreamerintegration.cpp b/src/plugins/multimedia/gstreamer/qgstreamerintegration.cpp
index bb2892f83..817aae1c2 100644
--- a/src/plugins/multimedia/gstreamer/qgstreamerintegration.cpp
+++ b/src/plugins/multimedia/gstreamer/qgstreamerintegration.cpp
@@ -59,47 +59,47 @@ const QGstreamerFormatInfo *QGstreamerIntegration::gstFormatsInfo() const
     return m_formatsInfo;
 }
 
-QPlatformAudioDecoder *QGstreamerIntegration::createAudioDecoder(QAudioDecoder *decoder)
+QMaybe<QPlatformAudioDecoder *> QGstreamerIntegration::createAudioDecoder(QAudioDecoder *decoder)
 {
     return new QGstreamerAudioDecoder(decoder);
 }
 
-QPlatformMediaCaptureSession *QGstreamerIntegration::createCaptureSession()
+QMaybe<QPlatformMediaCaptureSession *> QGstreamerIntegration::createCaptureSession()
 {
     return new QGstreamerMediaCapture();
 }
 
-QPlatformMediaPlayer *QGstreamerIntegration::createPlayer(QMediaPlayer *player)
+QMaybe<QPlatformMediaPlayer *> QGstreamerIntegration::createPlayer(QMediaPlayer *player)
 {
     return new QGstreamerMediaPlayer(player);
 }
 
-QPlatformCamera *QGstreamerIntegration::createCamera(QCamera *camera)
+QMaybe<QPlatformCamera *> QGstreamerIntegration::createCamera(QCamera *camera)
 {
     return new QGstreamerCamera(camera);
 }
 
-QPlatformMediaRecorder *QGstreamerIntegration::createRecorder(QMediaRecorder *recorder)
+QMaybe<QPlatformMediaRecorder *> QGstreamerIntegration::createRecorder(QMediaRecorder *recorder)
 {
     return new QGstreamerMediaEncoder(recorder);
 }
 
-QPlatformImageCapture *QGstreamerIntegration::createImageCapture(QImageCapture *imageCapture)
+QMaybe<QPlatformImageCapture *> QGstreamerIntegration::createImageCapture(QImageCapture *imageCapture)
 {
     return new QGstreamerImageCapture(imageCapture);
 }
 
-QPlatformVideoSink *QGstreamerIntegration::createVideoSink(QVideoSink *sink)
+QMaybe<QPlatformVideoSink *> QGstreamerIntegration::createVideoSink(QVideoSink *sink)
 {
     return new QGstreamerVideoSink(sink);
 }
 
-QPlatformAudioInput *QGstreamerIntegration::createAudioInput(QAudioInput *q)
+QMaybe<QPlatformAudioInput *> QGstreamerIntegration::createAudioInput(QAudioInput *q)
 {
     return new QGstreamerAudioInput(q);
 }
 
-QPlatformAudioOutput *QGstreamerIntegration::createAudioOutput(QAudioOutput *q)
+QMaybe<QPlatformAudioOutput *> QGstreamerIntegration::createAudioOutput(QAudioOutput *q)
 {
     return new QGstreamerAudioOutput(q);
 }