snd_uaudio man page on FreeBSD

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

NAME
     snd_uaudio — USB audio device driver

SYNOPSIS
     To compile this driver into the kernel, place the following lines in your
     kernel configuration file:

	   device sound
	   device usb
	   device snd_uaudio

     Alternatively, to load the driver as a module at boot time, place the
     following line in loader.conf(5):

	   snd_uaudio_load="YES"

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 ⟨hmp@FreeBSD.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			       December 15, 2005			   BSD
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