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):
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.
