oss_usb(7) OSS Devices oss_usb(7)NAME
oss_usb - USB Audio/MIDI/Mixer driver
DESCRIPTION
The Open Sound System driver for USB Audio and MIDI devices.
AUDIO
The Audio driver supports:
o 8-96Khz Playback/Recording
o 8 or 16 or 32 bits
o 2, 4, 6 or 8 channel audio.
o SPDIF digital output and Input
o AC3 passthrough
o Volume control and device input mixer
MIDI
The oss_usb driver supports all MIDI devices that are compatible with the official USB MIDI specification. In addition the driver supports
few devices that use their own private protocol (including some Yamaha and Midiman models).
USB MIXER
The USB Audio mixer is a new type of mixer that doesn't have the normal volume controls found on AC97 or Legacy SB devices. The USB audio
mixer provides control for selecting the Alternate device setting - this usually allows the device to be switched into a Professional audio
mode (eg 24bit or 96Khz mode)
ALTERNATIVE SETTINGS
Some USB audio devices use a feature called as alternative settings for bandwidth management. Typically such devices have multiple high
speed inputs and outputs that may require more bandwidth than provided by the USB bus. The alternative settings feature is used to select
between multiple low speed devices or just few high speed devices.
When the device has multiple alternative settings an "altsetting" selector will be visible in the control panel for the device (use oss-
mix(1) or ossxmix(1) to change it). Alternative setting OFF means that all audio devices are disabled. The other settings provide different
combinations of high/medium speed devices. You can use the ossinfo(1) command (ossinfo -a -v3) to find out the devices supported by the
currently selected alternative settings and the capabilities of them.
KNOWN BUGS
Under Linux it is necessary to run the ossdetect -d and ossdevlinks commands after an USB device has been hot-plugged. Alternatively you
can execute soundoff and soundon to reload OSS.
OPTIONS
None
FILES
/etc/oss4/conf/oss_usb.conf Device configuration file
AUTHOR
4Front Technologies
16 December 2012 oss_usb(7)
Check Out this Related Man Page
usb_as(7D) Devices usb_as(7D)NAME
usb_as - USB audio streaming driver
SYNOPSIS
sound@unit-address
DESCRIPTION
The usb_as driver is a USBA (Solaris USB Architecture) compliant client driver that supports the USB Audio Class 1.0 specification.
The usb_as driver processes audio data messages during play and record and sets sample frequency, precision, encoding and other functions
on request from the USB audio control driver. See usb_ac(7D).
This driver is plumbed under the USB audio control driver and does not directly interface with the user application.
FILES
/kernel/drv/usb_as
32-bit x86 ELF kernel module
/kernel/drv/amd64/usb_as
64-bit x86 ELF kernel module
/kernel/drv/sparcv9/usb_as
64-bit SPARC ELF kernel module
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+------------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+------------------------------+
|Architecture |SPARC, x86, PCI-based systems |
+-----------------------------+------------------------------+
|Availability |SUNWusb |
+-----------------------------+------------------------------+
|Stability level |Evolving |
+-----------------------------+------------------------------+
SEE ALSO mixerctl(1), attributes(5), usba(7D), usb_ac(7D), audio(7I), mixer(7I), streamio(7I)
Writing Device Drivers
Universal Serial Bus Specification 1.0 and 1.1
System Administration Guide: Basic Administration
http://www.sun.com/io
DIAGNOSTICS
In addition to being logged, the following messages may appear on the system console. All messages are formatted in the following manner:
Warning: <device path> (usb_as<instance num>): Error Message...
where <device path> is the physical path to the device in /devices directory.
No bandwidth available.
There is no bandwidth available for the isochronous pipe. As a result, no data will be transferred during play and record.
Operating a full/high speed audio device on a high speed port is not supported.
The USB software does not currently support full or high speed audio devices connected to an external USB 2.0 hub that is linked to a
port of a USB 2.0 host controller. Audio devices must be connected directly to a port of a USB 2.0 controller or to any USB 1.1 port.
Cannot access device. Please reconnect <name>.
There was an error in accessing the device during reconnect. Please reconnect the device.
Device is not identical to the previous one on this port. Please disconnect and reconnect.
A USB audio streaming interface was hot-removed while open. A new device was hot-inserted which is not identical to the original USB
audio device. Please disconnect the USB device and reconnect the device to the same port.
NOTES
The USB audio streaming interface will be power managed if the device is idle.
SunOS 5.10 9 Oct 2004 usb_as(7D)