Start processing. Subclasses should open resources and prepare
to produce data. Implementation should call gstbase.base_src.BaseSrc.startComplete
when the operation completes, either from the current thread or any other
thread that finishes the start operation asynchronously.
Start processing. Subclasses should open resources and prepare to produce data. Implementation should call gstbase.base_src.BaseSrc.startComplete when the operation completes, either from the current thread or any other thread that finishes the start operation asynchronously.