oss_cmpci(7)

📦
version 4.2-build2020 · 3 versions
, in ubuntu noble

✨ oss_cmpci ✨

okay bestie, welcome to the manual for oss_cmpci — the CMedia CMI8738/8768 audio driver 💖 this lives in section 7 of the manual (that's the OSS Devices corner of the world, iykyk).

🌸 NAME 🌸

oss_cmpci — the CMedia CMI8738/8768 audio driver. that's it, that's the name, she's serving exactly what it says on the tin 💅

🎀 DESCRIPTION 🎀

So. This is the Open Sound System driver for CMedia Electronics CMI8738/8768 audio. no cap, that's the whole vibe.

Here's what the CMI87xx device is giving, characteristically speaking:

  • 8/16 bit playback/record 🎧
  • mono/stereo/4ch/5.1ch playback 🔊
  • 8KHz to 48Khz sample rate ⏱️

🎛️ MIXER PANEL 🎛️

The CMedia chip has some unique features that get set up by the Mixer chip. Run ossxmix and it'll show you the CMI8738 mixer panel. slay.

Most of the sliders and buttons are, like, self evident — you'll clock them immediately, bestie. However, there are a few options that genuinely need explaining, so let's go:

  • 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. two streams, one chip, main character energy fr fr 🦋
  • 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. pick your fighter ✨
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 with ossinfo -a before you get your hopes up. periodt.

🌈 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. yeah. it's giving tradeoffs 💀
  • Polarity — certain models require you to flip the bit otherwise you get distorted audio. not me having to flip a bit to sound good 🙈
  • IMon — monitor input via SPDIF in.
  • Optical — sets the SPDIF to Optical (TOSLINK) or RCA Jacks interface.

💅 OPTIONS 💅

  • None

...yes bestie, literally none. the options list is empty, she said "no notes" and meant it. iconic. 👑

🍓 FILES 🍓

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

👑 AUTHOR 👑

4Front Technologies

and that's the whole page, bestie!! this little beauty comes from OSS Devices and it's dated 11 February 2015 — so yeah, she's an elder but she still ate 🌸💖 mwah, go run ossxmix and check your model number, ily 🫶✨

📦 where this page comes from