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vmixctl(7)			  OSS Devices			    vmixctl(7)

NAME
       oss_cmpci - CMedia CMI8738/8768 audio driver.

DESCRIPTION
       Open Sound System driver	for CMedia Electronics CMI8738/8768 audio

       CMI87xx device characteristics:

	      o	 8/16 bit playback/record

	      o	 mono/stereo/4ch/5.1ch playback

	      o	 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:

       o  Enable will enable SPDIF output.

       o  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.

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

       o  IMon - monitor input via SPDIF in.

       o  Optical  -  sets  the	SPDIF to Optical (TOSLINK) or RCA Jacks	inter-
	  face.

OPTIONS
       None

FILES
       /usr/local/lib/oss/conf/oss_cmpci.conf Device configuration file

AUTHOR
       4Front Technologies

			       28 February 2021			    vmixctl(7)

NAME | DESCRIPTION | OPTIONS | FILES | AUTHOR

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=oss_cmpci&sektion=7&manpath=FreeBSD+13.0-RELEASE+and+Ports>

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