NAME

       oss_cmpci - CMedia CMI8738/8768 audio driver.

DESCRIPTION

       Open Sound System driver for CMedia Electronics CMI8738/8768 audio

       CMI87xx device characteristics:

              •  8/16 bit playback/record

              •  mono/stereo/4ch/5.1ch playback

              •  8KHz to 48Khz sample rate.

       MIXER  PANEL  The  CMedia  chip provides some unique features that are set up by the Mixer
       chip. Running ossxmix will display the CMI8738 mixer panel.

       Most of the sliders and buttons are self evident. However there are some options that need
       explaining:

       Dual  Dac:  Enabling this button sets the CMPCI device as two separate output devices with
       /dev/dsp1 audio going to the front and /dev/dsp0 going to the rear outputs. Separate audio
       streams can be send to the device simultaneously.

       Speaker  Mode:  The  audio  can  be  sent  just  to  the  front speakers or it can be sent
       simultaneously to all speakers in the "Spread" mode.

       AC3 passthrough only works on Models 037 and higher. This is because of a hardware bug  in
       the earlier models so check the model number (ossinfo -a).

SPDIF:

       •  Enable will enable SPDIF output.

       •  Rec  will  allow  you  to  record  from the SPDIF device. Note that when you have SPDIF
          recording enabled, you cannot play 4/6 channel audio.

       •  Polarity - certain models require you to flip  the  bit  otherwise  you  get  distorted
          audio.

       •  IMon - monitor input via SPDIF in.

       •  Optical - sets the SPDIF to Optical (TOSLINK) or RCA Jacks interface.

OPTIONS

       None

FILES

       /etc/oss4/conf/oss_cmpci.conf Device configuration file

AUTHOR

       4Front Technologies

                                         17 January 2023                             oss_cmpci(7)