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snd_uaudio.4freebsd

Langue: en

Version: 300289 (debian - 07/07/09)

Section: 4 (Pilotes et protocoles réseau)


BSD mandoc

NAME

snd_uaudio - USB audio 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 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.

SEE ALSO

sound(4), usb(4)
"USB Audio Class Specifications" http://www.usb.org/developers/devclass_docs/

HISTORY

The 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. 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.
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-- Jayce - ... -