NAME
snd_uaudio – USB audio device driver
SYNOPSIS
device sound device usb device snd_uaudio
DESCRIPTION
The snd_uaudio driver provides support for USB audio class devices.
A USB audio device consists of a number of components: input terminals (e.g. USB digital input), output terminals (e.g. speakers), and a number of units in between (e.g. volume control).
Refer to the ‘USB Audio Class Specification’ for more information.
SEE ALSO
sound(4), usb(4) USB Audio Class Specifications, http://www.usb.org/developers/devclass_docs/.
HISTORY
The snd_uaudio driver first appeared in FreeBSD 4.7.
AUTHORS
This manual page was adopted from NetBSD 1.6 and modified for FreeBSD by Hiten Pandya ⟨[email protected]⟩.
BUGS
The PCM framework in FreeBSD, as of this writing, does not handle device un-registrations in a properly abstracted manner, i.e., a detach request is refused by the PCM framework if the device is in use. For USB and supposedly other detach-able busses, it is necessary to allow the device un-registration to complete successfully, otherwise the driver leaves wild pointers to invalid data structures and thus leading to a panic.