The #GDestroyNotify function to use to free the #GstDataQueueItem.
This function should also drop the reference to object the owner of the
#GstDataQueueItem is assumed to hold.
the duration in #GstClockTime of the miniobject. Can not be %GST_CLOCK_TIME_NONE.
the #GstMiniObject to queue.
the size in bytes of the miniobject.
%TRUE if object should be considered as a visible object.
Structure used by #GstDataQueue. You can supply a different structure, as long as the top of the structure is identical to this structure.