Remove override for resources, it can't work in general.
Rename method to add_object_listener to add a listener for
events/methods from the remote object.
Rename some methods to _call to call the interface and _notify
to notify the listeners.
Remove unused client event to be notified of resource
implementations.
The interface struct has the type,version and methods of the
interface.
Make spa interfaces extend from spa_interface and make a
separate structure for the methods.
Pass a generic void* as the first argument of methods, like
we don in PipeWire.
Bundle the methods + implementation in a versioned inteface
and use that to invoke methods. This way we can do version
checks on the methods.
Make resource and proxy interfaces that we can can call. We
can then make the core interfaces independent on proxy/resource and
hide them in the lower layers.
Add add_listener method to methods of core interfaces, just
like SPA.
This is necessary for 'do-timestamp' to work if the source provides no
timestamps. Without this, the timestamp from the first use will remain,
because the basesrc only overwrites timestamps that are
GST_CLOCK_TIME_NONE.
pw_core_find_format() is currently broken when one of the ports is already
active: The format of the active port is used and the other port is
completely ignored.
As a result, the autolink module may try to link a new port to the first
already active port even if the formats do not match.
To fix this, use the format of the active port as a filter and enumerate
the formats of the other port.
If one of the ports becomes invisible to a client, hide the link.
If one of the ports is owned by a client and the peer port becomes
invisible for the client, destroy the link.
To get the permissions of an object, combine the permissions
of the object and all the parent nodes up to the root.
This is necessary to enforce that a client can never see and
object id (in this case the parent id) it is not allowed to see.
Don't pass the ucred to the client construct, just set the properties
in the protocol.
Use the client properties to get ucred.
Add the security label to the client properties (from SO_PEERSEC)
Destroy all resources (except the core) for a client when it
does a hello. This typically needs to be done after passing the
connection fd from one client to another.
