uaudio -- USB audio device driver
The 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.
USB Audio Class Specifications,
The uaudio driver first appeared in appeared in FreeBSD 4.7.
This manual page was adopted from NetBSD 1.6 and modified for FreeBSD by
Hiten Pandya <hmp@FreeBSD.org>.
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.
FreeBSD 5.2.1 November 10, 2003 FreeBSD 5.2.1 [ Back ]