snd_uaudio (4)

Leading comments

$NetBSD: uaudio.4,v 1.15 2002/02/12 19:53:57 jdolecek Exp $

Copyright (c) 1999 The NetBSD Foundation, Inc.
All rights reserved.

This code is derived from software contributed to The NetBSD Foundation
by Lennart Augustsson.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaime...

(The comments found at the beginning of the groff file "man4/snd_uaudio.4freebsd".)

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.conf5:

snd_uaudio_load="YES"

DESCRIPTION

The ifconfig 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"

HISTORY

The ifconfig driver first appeared in Fx 4.7 .

AUTHORS

This manual page was adopted from Nx 1.6 and modified for Fx by An Hiten Pandya Aq hmp@FreeBSD.org .

BUGS

The 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 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.