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Leopard Reference: Audio
Core Audio's Hardware Abstraction Layer (HAL) acts as the interface between an audio device driver and an audio application. The HAL supports native multichannel audio in a manner that is scalable to future high-resolution formats. Developers can create audio devices compatible with Apple products and use HAL and I/O Kit APIs to create software to access audio devices.
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I/O Kit Framework Reference (HTML)
Describes the I/O Kit classes that support non-kernel access to I/O Kit objects through the device-interface mechanism.
 2009-03-04
Kernel Framework Reference (HTML)
Describes the APIs and classes (including I/O Kit families) that support kernel-resident device drivers.
 2009-01-06
Core Audio Glossary (HTML) (PDF)
Defines general digital audio terms as well as terms specific to Apple's Core Audio technology.
 2008-07-07
FireWire Audio User Library Framework Reference (HTML)
Describes the API that supports user-space access to FireWire audio devices and enables the creation of virtual FireWire audio devices.
 2008-04-08