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how to use kAudioUnitSubType_VoiceProcessingIO in mac 10.7
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how to use kAudioUnitSubType_VoiceProcessingIO in mac 10.7


  • Subject: how to use kAudioUnitSubType_VoiceProcessingIO in mac 10.7
  • From: 이항령 <email@hidden>
  • Date: Mon, 17 Sep 2012 11:43:52 +0900

hi. 

I'm using core audio for real-time communication.

the new feature of voice processing is added to mac 10.7 SDK and I hope it will improve voice quality.

I try to use it based on HALout audio unit.
http://developer.apple.com/library/mac/#technotes/tn2091/_index.html

However it is always fail when initializing due to setting kAudioOutputUnitProperty_CurrentDevice.

So I skip the setting current device, and resulting of it is no sound played.

I did
1. AudioComponentFindNext with kAudioUnitSubType_VoiceProcessingIO subType
2. create audio unit by AudioComponentInstanceNew
3. setting format by kAudioUnitProperty_StreamFormat
4. setting kAudioUnitProperty_SetRenderCallback, kAudioOutputUnitProperty_SetInputCallback
5. call AudioUnitInitialize

Is there anything I missed?

Thanks.

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