jack has the highest prio because if it's present, we assume the
user wants to use jack to route everything
bluez has higher prio than alsa because if it's present, we assume
the user wants to use the bluetooth device
- because it conflicts with pulseaudio and we actually still want
pipewire to be able to run along pulseaudio on default setups
- and because it doesn't work well yet
We have multiple instances of the monitor plugin, but that's ok.
connect/disonnect will not do anything bad if called multiple times
We need to connect later so that the first connection is the one from main().
Otherwise, if there is a connection error, we will see the warning from the
monitor first.
- pw_core_info has data that represent the remote core
- pw_core properties are the properties of its pw_client,
initially inherited from the pw_context, which can be updated either
when calling pw_context_connect() or later at runtime (the pw_core
calls pw_client_update_properties() on its pw_client)
wp_core_update_properties() is made in such a way so that we can do:
```
clone = wp_core_clone(core);
wp_core_update_properties(clone, ...);
wp_core_connect(clone);
```
and get clone to have different properties than the original core,
while they still share the same pw_context underneath
By mistake, WpImplNode was developed by keeping in mind that the proxy
returned by pw_core_export() is a PW_TYPE_INTERFACE_Node, but this
is not true. It's actually a ClientNode...
Unfortunately, making WpImplNode work as if it was a WpNode is
not so easy, especially when it comes to handling params, which
need to be queried syncrhonously on the underlying spa_node.
So, instead of fixing WpImplNode to work as a WpNode, we choose to
disconnect them. This way, WpImplNode will not be used as a proxy
in the registry and the registry will normally create WpNode proxies
instead, making round-trips through the server to change node params.
This is necessary to finish augmenting nodes that advertise
PropInfo & Props in their param info but they don't actually have
any properties, so there is no param event emitted
(ex. the jack device nodes)
Because the sync is synchronous with the calls over the protocol,
the callback is ensured to be called after all the param events
have been emitted
