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.