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Leopard Guides: Hardware & Drivers
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.
View all Audio Guides.
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Audio Developer Note (HTML)
Describes the analog and digital audio capabilities of Mac computers.
 2008-04-28
Audio Device Driver Programming Guide (HTML) (PDF)
Explains how to develop kernel-resident drivers for audio devices.
 2009-03-04