Provided by: oss4-base_4.2-build2004-1ubuntu2_i386
oss_usb - USB Audio/MIDI/Mixer driver
The Open Sound System driver for USB Audio and MIDI devices.
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
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).
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)
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
ossmix(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
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.
/etc/oss4/conf/oss_usb.conf Device configuration file
27 September 2011 oss_usb(7)