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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 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 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
CONFIGFILEPATH/oss_usb.conf Device configuration file
AUTHOR
4Front Technologies
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