Hi > Guest interfacing is next to impossible I think, simply because real > hardware has no need for that and thus the interfaces simply don't > exist > in the hardware we are emulating. We can try to fix that with a > virtio > soundcard which has such interfaces, but it could be this simply > shifts > the issue from the driver/hardware interface to the os-kernel/driver > interface.
btw, the Xen folks just merged a PulseAudio sink/src implementation a few days ago: http://cgit.freedesktop.org/pulseaudio/pulseaudio/commit/?id=50a7bf1175eaf07521c00bde8eed2f820e64437f
