GetAllInputsFor
status_t GetAllInputsFor(const media_node& node,
&& roster->GetAllInputsFor(node, &in, 1, &count) == B_OK
err = roster->GetAllInputsFor(node, inputs,
rv = roster->GetAllInputsFor(destinationNode,inputs,2,&count);
rv = roster->GetAllInputsFor(sourceNode,inputs,2,&count);