oss_geode(7) OSS Devices oss_geode(7)NAME
oss_geode - National Semiconductor Geode audio driver.
DESCRIPTION
Open Sound System driver for National Semiconductor Geode/CS5530/CS5536 audio controllers.
Geode device characteristics:
o 8/16 bit playback/record
o mono/stereo playback/recording
o 8KHz to 48Khz sample rate.
NOTES
Some old Geode CPUs are not able to handle heavy computational loads. If your audio streams are use a lot of CPU, you can start getting
garbled audio since the OSS Sample Rate Convertor is CPU intensive. Setting vmix0-src to OFF will allow you to play audio but only at a
fixed rate set via vmixctl (Default: 48Khz).
FILES
/etc/oss4/conf/oss_geode.conf Device configuration file
AUTHOR
4Front Technologies
16 December 2012 oss_geode(7)
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oss_cmi878x(7) OSS Devices oss_cmi878x(7)NAME
oss_cmi878x - CMedia CMI8788 audio driver.
DESCRIPTION
Open Sound System driver for CMedia Electronics CMI8788 audio
CMI87xx device characteristics:
o 8/16/24/32 bit playback/record
o mono/stereo/4ch/5.1/7.1 playback
o 8KHz to 192Khz sample rate.
The CMedia 8788 device provides 3 types of devices. The first devices is a Multichannel full duplex device. The second device provides
Front Panel audio access and the SPDIF device provide SPDIF (Digital) audio I/O.
MIXER PANEL
The CMedia chip provides some unique features that are set up by the Mixer chip. There are 3 mixer devices presented to the user.
Main Mixer Panel (/dev/mixer0)
o Master Mixer panel is for controlling output volumes for each of the 8 channels.
o Monitor buttons will allow you to monitor the input from the Rear Panel inputs, Front Panel Inputs and SPDIF IN.
o Speaker-Spread function duplicates the front channel output on all 8 speakers.
o SPDIF Loopback simply takes SPDIF Input and Plays it out the SPDIF Output. panel.
AC97 Input Mixer Panel (/dev/mixer1) This mixer panel is used to switch between the various inputs like line-in, mic, cd. When the
Rear Panel Monitor button is check marked in the Main mixer panel, the IGAIN slider in this panel controls the level of the input
that can be hear on the speakers.
AC97 Front Panel Mixer (/dev/mixer2) This mixer controls the front panel ac97 device. It can be used to control all the volumes and
inputs as well as SPDIF output on the front panel device.
OPTIONS
None
FILES
/etc/oss4/conf/oss_cmi878x.conf Device configuration file
AUTHOR
4Front Technologies
16 December 2012 oss_cmi878x(7)
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