CMPCI(4)						   BSD Kernel Interfaces Manual 						  CMPCI(4)

NAME

     cmpci -- C-Media CMI8x38 audio device driver

SYNOPSIS

     cmpci* at pci? dev ? function ?
     audio* at audiobus?
     mpu*   at cmpci?
     opl*   at cmpci? flags 1

DESCRIPTION

     The cmpci device driver supports C-Media CMI8x38 based sound cards.

     The device has SPDIF input/output interfaces, 16bit CODEC with analog mixer, OPL3 FM Synthesizer, and MPU401 compatible MIDI I/O port inter-
     face.

MIXER DEVICE

     The mixer device of cmpci driver can be accessed via mixerctl(1) command.	The complex structure is analyzed as follows.

     SPDIF in  ----------------------
     #1(coax)->|spdin1		    |  R    -----------------------
     #2(opt)-->|spdin2	spdif.input |--*->--|spdin   spdif.output |--> SPDIF
	    -->|spdout		    |  | -->|playback		  |    output
	    |  ----------------------  | |  -----------------------
	    --------------------<------+-*
	  ---------<-------------------+-+----------------------------------
	  |  ------------------------  | |   -----------------------	   |
	  -->|legacy  spdif.output. |--+-*-->|spdout		   |	   |
	  -->|wave    playback	    |  ----->|spdin  spdif.monitor |----   |
	  |  ------------------------	  NC-|off		   |   |   |
	  ---------<-- spdif		     -----------------------   |   |
	      -------+------- dac ------------	  -----------------    v   |
     wave  -->|playback.mode|---->|inputs.dac|-*->|inputs.dac.mute|->----- |
     playback ---------------	  ------------ R  -----------------  | + | |
		       -----------------     ---------------------   |mix| |
     FM synthesizer -->|inputs.fmsynth |--*->|inputs.fmsynth.mute|-->----- |
		       -----------------  R  ---------------------     *->--
     CD        ----------------------	---------------------------    v
     LINE-IN ->|inputs.{cd,line,aux}|-*>|inputs.{cd,line,aux}.mute|->-----
     AUX       ---------------------- R ---------------------------  |	 |
	       ------------------				     |	 |
     PC-SPK -->| inputs.speaker |----------------------------------->| + |
	       ------------------				     |	 |
	       -------------------  ------------  -----------------  |mix|
     MIC --*-->|inputs.mic.preamp|->|inputs.mic|->|inputs.mic.mute|->|	 |
	   |   -------------------  ------------  -----------------  -----
	   |   ------------   ----------------- 		      |
	   --->|record.mic|-->| 	      | 		      v
	       ------------   | record.source |-->to	     -----------
			 *R-->| (select, mix) |   recording  |outputs.*|-->
			      ----------------- 	     ----------- SPK
								      (front)

     Note the 2nd SPDIF input exists only on CMI8738/PCI-6ch versions.

MIXER EXAMPLES

     Here are examples about wave playback and SPDIF input/output ports.

     Playback to speaker, SPDIF input to SPDIF output
	      mixerctl -w playback.mode=dac spdif.output=spdin spdif.monitor=off

     Playback to SPDIF output, SPDIF input to speaker
	      mixerctl -w playback.mode=spdif spdif.output=playback spdif.output.playback=wave spdif.monitor=spdin

     SPDIF input to both SPDIF output and speaker
	      mixerctl -w spdif.output=spdin spdif.monitor=spdin

     Playback to both SPDIF output and speaker
	      mixerctl -w playback.mode=spdif spdif.output=playback spdif.output.playback=wave spdif.monitor=spdout

     Mix playback and SPDIF input to speaker
	      mixerctl -w playback.mode=dac spdif.monitor=spdin

SEE ALSO

     mixerctl(1), audio(4), midi(4), mpu(4), opl(4), pci(4)

HISTORY

     The cmpci device driver appeared in NetBSD 1.5.

BUGS

     4ch/6ch playback is not yet available.  Joystick port is not supported.

     spdif.output.playback=legacy does not seem to work properly.

BSD
								   June 22, 2005							       BSD