Continuing from SPEC-2626

Pipewire should install the gstreamer elements that it comes with and the apps should use pwaudiosink instead of alsasink.
 
 
Originally I wanted to avoid that so that the apps don't have to use an agl-specific gstreamer element, but as it turns out there are a couple of limitations with alsasink:

• it's not very easy to change the default latency in order to solve this issue
• it has no way of reporting back to the application that there is another higher-priority app that has taken over the audio stream, making it impossible to implement policies (and it actually hangs if the session manager decides to unlink it from the device)
• there is no way to specify the role of the stream without hacks