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by Takuya SHIOZAKI <AoiMoe (at] imou.to> .
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by ITOH Yasufumi.
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.Dd June 22, 2005 .Dt CMPCI 4 .Os .Sh NAME .Nm cmpci .Nd C-Media CMI8x38 audio device driver .Sh SYNOPSIS .Cd "cmpci* at pci? dev ? function ?" .Cd "audio* at audiobus?" .Cd "mpu* at cmpci?" .Cd "opl* at cmpci? flags 1" .Sh DESCRIPTION The .Nm device driver supports C-Media CMI8x38 based sound cards.
p The device has SPDIF input/output interfaces, 16bit CODEC with analog mixer, OPL3 FM Synthesizer, and MPU401 compatible MIDI I/O port interface. .Sh MIXER DEVICE The mixer device of .Nm driver can be accessed via .Xr mixerctl 1 command. The complex structure is analyzed as follows. d -literal 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) .Ed
p Note the 2nd SPDIF input exists only on CMI8738/PCI-6ch versions. .Sh MIXER EXAMPLES Here are examples about wave playback and SPDIF input/output ports. l -tag -width 1n t Playback to speaker, SPDIF input to SPDIF output .Dl mixerctl -w playback.mode=dac spdif.output=spdin spdif.monitor=off t Playback to SPDIF output, SPDIF input to speaker .Dl mixerctl -w playback.mode=spdif spdif.output=playback spdif.output.playback=wave spdif.monitor=spdin t SPDIF input to both SPDIF output and speaker .Dl mixerctl -w spdif.output=spdin spdif.monitor=spdin t Playback to both SPDIF output and speaker .Dl mixerctl -w playback.mode=spdif spdif.output=playback spdif.output.playback=wave spdif.monitor=spdout t Mix playback and SPDIF input to speaker .Dl mixerctl -w playback.mode=dac spdif.monitor=spdin .El .Sh SEE ALSO .Xr mixerctl 1 , .Xr audio 4 , .Xr midi 4 , .Xr mpu 4 , .Xr opl 4 , .Xr pci 4 .Sh HISTORY The .Nm device driver appeared in .Nx 1.5 . .Sh BUGS 4ch/6ch playback is not yet available. Joystick port is not supported.
p .Dv spdif.output.playback=legacy does not seem to work properly.
Indexes created Sun Sep 21 20:09:37 GMT 2025