Acquire org.freedesktop.ReserveDevice1.Audio<N> before opening the PCM,
hold for the entire stream lifetime, release on Drop after the PCM
closes. Closes the path where exclusive open would silently fight an
active PipeWire route.
Field order in AlsaDirectStream is significant: _reservation is the
last field so it drops AFTER the PCM closes, ensuring the kernel-level
exclusive lock is released before the D-Bus bus name is freed and
PipeWire reclaims the device.
This is the canonical Lifetime-A consumer the device_reservation
acquire doc-comment's tight-coupling rule allows: a DeviceReservation
created immediately before a real PCM::new() and held for as long as
the PCM is open. A 50 ms defensive sleep gives PipeWire time to vacate
the device after releasing the reservation.
cc
vicrodh
92633dcf12