|AC97(4)||Device Drivers Manual||AC97(4)|
ac97 — generic
AC'97 codec driver
AC'97 codecs contain the analog to digital (A/D), digital to analog (D/A), and mixing circuitry of many modern sound cards. AC'97 codecs, for the most part, do not talk to host buses like the PCI bus directly. Instead, they communicate through an interface chip, called the host controller. The Ensoniq AudioPCI 97 (see eap(4)) is an example of such a host controller.
Unlike many drivers, the
ac97 driver does
not appear in the configuration file. Instead, the driver is automatically
attached by the drivers that require it.
ac97 driver does not keep track of the
current user settings and instead relies on the hardware to do this.
ac97 driver could do more to detect
mixer channels that don't work and cull them from the list.
|February 26, 2010||OpenBSD-current|