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And be careful not to handle nodes created by si-audio-endpoint,
by using a specific property for that.

Also, use Audio/{Source,Sink}/Virtual as the media class of null sinks
created by si-audio-endpoint, it sounds more appropriate.

Fixes #34

This avoids reconfiguring endpoint nodes when re-linking streams
to their endpoint after having been corked by the policy.

This is not ideal, the logic here needs some refinement.

There is now a second param to the callback that is an error string,
if any error happened

This breaks the valgrind test setup, as this G_SLICE overrides
G_SLICE=always-malloc from valgrind_env

This reverts commit a0d0069f.

ensures that we get debug symbols from modules printed correctly

To be consistent with the rest of the API where strings are used
to identify param types

This can catch allocation mistakes in the g_slice allocator

it's just a nicer syntax

and use fprintf() for fatal errors, to make sure they are shown

pipewire's client.conf sets the default log level to 0, which is not
good for wpexec, as lua runtime errors are reported as warnings currently.

Also, let's use fprintf() for local cli errors to make sure they get printed
even if the log level is 0

systemd stops wireplumber with SIGTERM and this should exit gracefully.
if wireplumber is started by other means, it may just stop when pipewire
stops... that's also fine

Aim for 8 pointers on each struct, wich exceptions:
- 12 pointers for already crowded/important ones
- 4 pointers for empty ones that are used for proxies; we are
  unlikely to add any virtual methods on these classes ever

Otherwise structs do not have any members shown by default.
This was accidentally removed in an older commit.

there is a breathe_default_project in conf.py.in that sets this

Closes #33

wplua_push* takes a full ref

Spotted with clang-tidy, avoids possible segfault if pod is NULL.

object-interest is now ref-counted, so we can use _ref()

Related to #33

Until now, object manager could only match pw global properties on
pw global objects, because this is the only available properties set
at the time the registry creates the global.

With this change, the object manager will now bind the proxy
if the type and the pw global properties have matched and will wait
until the proxy is available with all of its properties and tries
the check again.