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Re: Measuring Input/Output latencies
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Re: Measuring Input/Output latencies


  • Subject: Re: Measuring Input/Output latencies
  • From: Brian Willoughby <email@hidden>
  • Date: Thu, 25 Aug 2011 03:30:54 -0700


On Aug 25, 2011, at 02:57, Stéphane Letz wrote:
Well according to this mail: http://lists.apple.com/archives/ coreaudio-api/2008/Aug/msg00160.html

Latencies are supposed to change from stream to stream, in particular depending of Analog/Digital status:

But reading the stream latencies for : MacBook Pro (analog only), Mac Pro (analog/digital), Motu 828 Mk2 (analog/digital), I get 0 for all streams....

There are certainly examples of drivers which do not report an accurate latency. However, your code should always read the stream latencies and add them in, even if you can only find "0" for the interfaces you have tested so far.


The original question is still valid, I just wanted to make sure that all the available numbers were being included in the calculations. What would be great is if someone with detailed knowledge of any particular device could verify that the latencies are reported properly and that they correspond to the measured latency.

Brian Willoughby
Sound Consulting

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References: 
 >Measuring Input/Output latencies (From: Stéphane Letz <email@hidden>)
 >Re: Measuring Input/Output latencies (From: Ross Bencina <email@hidden>)
 >Re: Measuring Input/Output latencies (From: Stéphane Letz <email@hidden>)

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