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SND_UAUDIO(4)            BSD Kernel Interfaces Manual            SND_UAUDIO(4)

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 <hmpATFreeBSD.org>.

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.

BSD                             August 28, 2004                            BSD