---
name: "oss_cmi878x"
section: "7"
platform: "linux"
package: "oss4-base"
version: "4.2-build2010-2"
release: "Debian 8 (Jessie)"
platforms: ["linux"]
url: "https://new.carta.tech/oss_cmi878x"
---

# oss\_cmi878x(7)

CMedia CMI8788 audio driver.

## NAME

**oss\_cmi878x** - CMedia CMI8788 audio driver.

## DESCRIPTION

**Open Sound System driver for CMedia Electronics CMI8788 audio**

**CMI87xx device characteristics:**

- •

  **8/16/24/32 bit playback/record**

- •

  **mono/stereo/4ch/5.1/7.1 playback**

- •

  **8KHz to 192Khz sample rate.**

**The CMedia 8788 device provides 3 types of devices. The first devices is** **a Multichannel full duplex device. The second device provides Front Panel** **audio access and the SPDIF device provide SPDIF (Digital) audio I/O.**

### MIXER PANEL

**The CMedia chip provides some unique features that are set up** **by the Mixer chip. There are 3 mixer devices presented to the user.**

**Main Mixer Panel (/dev/mixer0)**

- •

  **Master Mixer panel is for controlling output volumes for each of the 8** **channels.**

- •

  **Monitor buttons will allow you to monitor the input from the Rear Panel** **inputs, Front Panel Inputs and SPDIF IN.**

- •

  **Speaker-Spread function duplicates the front channel output on all 8** **speakers.**

- •

  **SPDIF Loopback simply takes SPDIF Input and Plays it out the SPDIF Output.** **panel.**

**AC97 Input Mixer Panel (/dev/mixer1)** **This mixer panel is used to switch between the various inputs like line-in,** **mic, cd. When the Rear Panel Monitor button is check marked in the Main** **mixer panel, the IGAIN slider in this panel controls the level of the input** **that can be hear on the speakers.**

**AC97 Front Panel Mixer (/dev/mixer2)** **This mixer controls the front panel ac97 device. It can be used to control** **all the volumes and inputs as well as SPDIF output on the front panel device.**

## OPTIONS

**None**

## FILES

**/etc/oss4/conf/oss\_cmi878x.conf Device configuration file**

## AUTHOR

**4Front Technologies**