do_preroll

Description:

public FlowReturn do_preroll (MiniObject obj)

If the this spawns its own thread for pulling buffers from upstream it should call this method after it has pulled a buffer.

If the element needed to preroll, this function will perform the preroll and will then block until the element state is changed.

This function should be called with the PREROLL_LOCK held.

Parameters:

this

the sink
obj

the mini object that caused the preroll

Returns:

OK if the preroll completed and processing can continue. Any other return value should be returned from the render vmethod.