Re: Measuring Input/Output latencies
Re: Measuring Input/Output latencies
- Subject: Re: Measuring Input/Output latencies
- From: Stéphane Letz <email@hidden>
- Date: Thu, 25 Aug 2011 21:30:18 +0200
L
>
> Message: 4
> Date: Thu, 25 Aug 2011 03:30:54 -0700
> From: Brian Willoughby <email@hidden>
> Subject: Re: Measuring Input/Output latencies
> To: CoreAudio API <email@hidden>
> Message-ID: <email@hidden>
> Content-Type: text/plain; charset=ISO-8859-1; delsp=yes; format=flowed
>
>
> 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
>
All the available numbers are now in the calculations, but even on Apple hardware + drivers, the result is different from what the IO latency tool measure...
Very annoying....
Stephane Letz _______________________________________________
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