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  3. Sound server - Wikipedia
Sound server - Wikipedia
From Wikipedia, the free encyclopedia
This article is about a form of computer program that runs in the background. For computers that stream audio over a network, see media server.

A sound server is software that manages the use of and access to audio devices (usually a sound card). It commonly runs as a background process.

Sound server in an operating system

Description of layers that uses a Sound Server

In a Unix-like operating system, a sound server mixes different data streams (usually raw PCM audio) and sends out a single unified audio to an output device. The mixing is usually done by software, or by hardware if there is a supported sound card.

Layers

The "sound stack" can be visualized as follows, with programs in the upper layers calling elements in the lower layers[1]:

Motivation

Sound servers appeared in Unix-like operating systems after limitations in Open Sound System were recognized. OSS is a basic sound interface that was incapable of playing multiple streams simultaneously, dealing with multiple sound cards, or streaming sound over the network.

A sound server can provide these features by running as a daemon. It receives calls from different programs and sound flows, mixes the streams, and sends raw audio out to the audio device.

With a sound server, users can also configure global and per-application sound preferences.

Diversification and problems

As of 2012 there are multiple sound servers; some focus on providing very low latency, while others concentrate on features suitable for general desktop systems. While diversification allows a user to choose just the features that are important to a particular application, it also forces developers to accommodate these options by necessitating code that is compatible with the various sound servers available. Consequently, this variety has resulted in a desire for a standard API to unify efforts.

List of sound servers

Streaming

References

  1. ^ "Professional audio - ArchWiki". wiki.archlinux.org. Retrieved 2026-02-27.
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