Audio

AppleHDA

AppleHDA is the default kext for Audio. After 10.6.3, it only supports some Audio Codecs by default.

Patching AppleHDA

Patching AppleHDA can be very difficult. It requires much understanding of HDA and editing three files:

1. /System/Library/Extensions/AppleHDA.kext/Contents/MacOS/AppleHDA must be patched.
2. /System/Library/Extensions/AppleHDA.kext/Contents/PlugIns/AppleHDAHardwareConfigDriver.kext/Contents/Info.plist
3. /System/Library/Extensions/AppleHDA.kext/Contents/PlugIns/AppleHDAPlatformDriver.kext/Contents/Info.plist
4. Enabling your audio adapter with either a DSDT edit or an extension like HDAEnabler.kext

Weblinks

• Link list
• Complete Guide Step 1-4
• Step 1
  • Command-line snippets
• Step 2+Step 3
  • Not finished, but more current guide by TheKing
  • taruga's patcher for OSX 10.5
• Step 4
  • HDMI audio output for NVIDIA
  • HDMI audio output for ATI

VoodooHDA

VoodooHDA support many different sound adapters. It's currently the best choice if you don't have native support of AppleHDA or patching AppleHDA doesn't work for you.

Weblinks

• Latest build
• VoodooHDA project

Apple Azalia

The old AppleAzaliaAudio.kext still provides audio output up to OSX 10.6 (32-bit mode, boot flag: arch=i386) for several Codecs from Realtek, Sigmatel, Cmedia, Analog Devices or Conexant. Only Stereo output is supported. Volume is a bit louder than with AppleHDA or VoodooHDA.