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$FreeBSD: head/share/man/man4/snd_uaudio.4 134808 2004-09-05 12:17:06Z brueffer $
.Dd November 10, 2003 .Dt UAUDIO 4 .Os .Sh NAME .Nm uaudio .Nd USB audio device driver .Sh SYNOPSIS .Cd "device pcm" .Cd "device usb" .Sh DESCRIPTION The .Nm driver provides support for .Tn USB audio class devices.
p A .Tn 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).
p Refer to the .Ql USB Audio Class Specification for more information. .Sh SEE ALSO .Xr pcm 4 , .Xr usb 4 .Rs .%T "USB Audio Class Specifications" .%O http://www.usb.org/developers/devclass_docs/ .Re .Sh HISTORY The .Nm driver first appeared in .Fx 4.7 . .Sh AUTHORS This manual page was adopted from .Nx 1.6 and modified for .Fx by .An Hiten Pandya Aq hmp@FreeBSD.org . .Sh BUGS The .Tn PCM framework in .Fx , as of this writing, does not handle device un-registrations in a properly abstracted manner, i.e., a detach request is refused by the .Tn PCM framework if the device is in use. For .Tn 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.