Created attachment 313911 [details] [review]
Sample project for DeviceMonitor

I did not implement the gst_device_get_properties method wrapper because the returned structure is not shared, and I could not understand how to do the things right in this case.

the properties are just returns as a GstStructure that you own, there is no sharing there.

(In reply to Olivier Crête from comment #3)
> the properties are just returns as a GstStructure that you own, there is no
> sharing there.

Yes, i'm already know it. The problem is on QtGst side.
QGst::StructurePtr is 

    typedef QSharedPointer<SharedStructure> StructurePtr;

And QGst::SharedStructure requires an owner object to addref him.

class QTGSTREAMER_EXPORT SharedStructure : public Structure
{
public:
    virtual ~SharedStructure();

    /*! \returns a deep copy of the structure */
    Structure copy() const;

private:
    //Only these classes can call our constructor, others should use a StructurePtr passed to them
    friend class Caps;
    friend class Message;
    friend class Event;
    friend class Query;

    struct Data;

    QTGSTREAMER_NO_EXPORT
    SharedStructure(Data *data);
    QTGSTREAMER_NO_EXPORT
    static StructurePtr fromMiniObject(GstStructure *structure, const MiniObjectPtr & parent);
    QTGSTREAMER_NO_EXPORT
    static StructurePtr fromCaps(GstStructure *structure, const CapsPtr & parent);

    Q_DISABLE_COPY(SharedStructure);
};

I hope that George Kiagiadakis will find a bit of its time to look at it.

Thanks for the patches. Although qt-gstreamer is unmaintained, I have pushed them in an effort to close its tickets while saving as much as possible from what has been contributed in patches.

For the record, I believe the structure issue would have been solved if you used QGst::Structure instead of StructurePtr.

---

commit 7f298aa319703826ebf78b4b8aaa6caf8e36c292
Author: Pavel Bludov <pbludov@gmail.com>
Date:   Fri Oct 23 14:56:57 2015 +0800

    DeviceMonitor example

commit 437a3ae0e0548f5db7515341728a77a4e852ff80
Author: Pavel Bludov <pbludov@gmail.com>
Date:   Fri Oct 23 14:56:26 2015 +0800

    Device & DeviceMonitor support