Create a new structure change message. This message is posted when the structure of a pipeline is in the process of being changed, for example when pads are linked or unlinked.
src should be the sinkpad that unlinked or linked.
The object originating the message.
The change type.
The owner element of src.
Whether the structure change is busy.
the new structure change message.
MT safe.
Create a new structure change message. This message is posted when the structure of a pipeline is in the process of being changed, for example when pads are linked or unlinked.
src should be the sinkpad that unlinked or linked.