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Linux Soundcard Drivers: A brief guide for users and developers

by Dave Phillips
05/17/2001

Introduction

In the Windows and Mac worlds, the end user rarely worries about drivers. Hardware manufacturers normally provide binaries, complete with installation utilities and other amenities (mixers, example programs, players, etc.), and updates are often available for free on the Internet. Alas, Linux does not yet enjoy the happy status of those worlds: manufacturers rarely supply native Linux drivers in any form, and Linux developers must often go to great efforts to write usable drivers for the manufacturer's hardware.

Linux applications depend on drivers to enable communications between an application and a hardware device such as a printer, CD-ROM drive, or soundcard. A working Linux sound system can be thought of as a sandwich, with application software as the top slice of bread and sound hardware (soundcard and speakers) as the bottom slice. Sandwiched in the middle is the meat (at least, the meat of this article) -- the audio device control software or soundcard device driver.

A soundcard driver provides the communication interface between an application and the audio system hardware. The driver operates within a multistage process: an application requests audio services from the kernel, the kernel summons the appropriate driver module (e.g., /usr/lib/modules/2.4.0/sound/es1370.o for my SB PCI128) to communicate with the soundcard, and the driver manages the bit-level manipulations of the soundcard's audio chipset. The driver acts as a translator for commands received from an application (which generally doesn't care whether my soundcard is a SoundBlaster Live Platinum or a PAS16), turning them into the very hardware-specific commands unique to the actual card, i.e., if I want sound from my SB Live I must have a Linux-compatible SB Live device driver.

Related Reading:

Linux Device Drivers

Linux Device Drivers, 2nd Edition
By Alessandro Rubini & Jonathan Corbet
2nd Edition July 2001
0-59600-008-1, Order Number: 0081
560 pages (est.), $39.95 (est.)

Since drivers are hardware-specific, it should come as no surprise that one of the most frequently asked questions in Linux discussion groups is "Where can I find a driver for my [insert card name here] soundcard ?!". This article will help answer that question and others regarding the somewhat obscure world of Linux audio device drivers:

Let's start by taking a look at the various sources for Linux soundcard drivers.

Finding and Installing Drivers

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