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AUHAL + Device Latency
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AUHAL + Device Latency


  • Subject: AUHAL + Device Latency
  • From: Dominic Feira <email@hidden>
  • Date: Tue, 15 Jul 2008 16:51:15 -0400

I find myself having to synchronize the audio from multiple input devices.  I am full aware of aggregate devices, but for reasons I'd rather not get into I can't use them.

Which leads me to my questions.

All of the time stamps that I get from the AUHAL have a rate scalar of 1.  This doesn't seem right.  Do I need to talk to the device directly to get it?

Does the AUHAL do anything to compensate for latency?

How does kAudioUnitProperty_Latency relate to kAudioDevicePropertyLatency and kAudioStreamPropertyLatency?

Does AudioDeviceTranslateTime take latency into consideration at all?  

After having to go through this, I highly recommend everybody use aggregate devices when possible.  Synching devices really isn't any fun.

Dominic Feira / Code Monkey / Ambrosia Software, Inc. -- http://www.AmbrosiaSW.com

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