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 interface.
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
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.