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Re: AUHAL Full duplex issues
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Re: AUHAL Full duplex issues


  • Subject: Re: AUHAL Full duplex issues
  • From: Brian Willoughby <email@hidden>
  • Date: Tue, 10 Aug 2010 22:09:41 -0700


On Aug 10, 2010, at 21:38, Aridis-Lang, Simon wrote:
... I don't understand why if the AUHAL is an audio unit, and my 'IOProc' is registered on the audio unit, why an audio unit property is the wrong answer? Could you elaborate on how the AUHAL abstracts the HAL and how these two settings interact (is one ignored? is it the minimum / maximum of the two?). A lot of example code out in the wild is setting both so it would help to understand why others have settled on this arrangement.

AUHAL is a convenient translating link between an application and the HAL, but AUHAL is still completely separate from the HAL. If you want to change the hardware buffer size, then you need to find the AudioDevice via a different API and send it the message that Bill mentioned. I don't think he meant that you could send the HAL message to the AUHAL and expect it to work, although it might be an interesting feature to request (i.e. that the output scope of the AUHAL pass buffer size messages on to the HAL device).


Brian Willoughby

Sound Consulting


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  • Follow-Ups:
    • RE: AUHAL Full duplex issues
      • From: "Aridis-Lang, Simon" <email@hidden>
References: 
 >AUHAL Full duplex issues (From: "Aridis-Lang, Simon" <email@hidden>)
 >RE: AUHAL Full duplex issues (From: "Aridis-Lang, Simon" <email@hidden>)
 >Re: AUHAL Full duplex issues (From: William Stewart <email@hidden>)
 >RE: AUHAL Full duplex issues (From: "Aridis-Lang, Simon" <email@hidden>)

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