This function gets back user data pointers stored via gst_mini_object_set_qdata() and removes the data from object without invoking its destroy() function (if any was set).
A GQuark, naming the user data pointer
The user data pointer set, or NULL. [transfer full]
See Implementation
This function gets back user data pointers stored via gst_mini_object_set_qdata() and removes the data from object without invoking its destroy() function (if any was set).