NAME

       snd_uaudio — USB audio and MIDI 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 and USB MIDI 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.  It is
       necessary  to  allow  the  device  un-registration to complete successfully, otherwise the PCM layer will
       panic.

Debian                                          February 24, 2011                                  SND_UAUDIO(4)