audioadapter: add support for passthrough mode
Allows audioadapter to behave as its follower.
This has been tested using a small example in my other branch: https://gitlab.freedesktop.org/julian/pipewire/-/commits/example-passthrough
Allows audioadapter to behave as its follower.
This has been tested using a small example in my other branch: https://gitlab.freedesktop.org/julian/pipewire/-/commits/example-passthrough