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Leopard Sample Code: 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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AudioCDSample (HTML) (DMG) (ZIP)
Demonstrates how to discover audio CDs and access the TOC information presented by the CD-DA filesystem.
 2005-10-04
SampleUSBAudioPlugin (HTML) (DMG) (ZIP)
USB audio plugin that performs a lowpass filtering operation on audio streamed through an audio USB Device.
 2005-03-07
SimplePlayThru (HTML) (DMG) (ZIP)
Use the HAL's Audio Output Unit (AUHAL) for device input and output on a single device (play-thru)
 2006-10-25
SimpleUserClient (HTML) (DMG) (ZIP)
Shows how to create a user client for an I/O Kit kernel driver.
 2008-08-27
VelEng FFT (HTML) (DMG) (ZIP)
G4 Velocity Engine implementation of Fast Fourier Transform (FFT) and associated convolution/correlation routines.
 2003-01-14