Re: Info on HALLab telemetry window?
Re: Info on HALLab telemetry window?
- Subject: Re: Info on HALLab telemetry window?
- From: peoplestank <email@hidden>
- Date: Wed, 16 Aug 2006 14:20:07 -0700 (PDT)
Hi Jeff-
Thanks for your response. From the basic info plus
some other archived posts on HALLab I have been able
to figure out a few things about the driver I'm
developing:
1) I can generate time stamps in my driver from
either the output or the input streams
a) When I use the output, I get generally smooth
audio except for occasional glitches, but the "rate"
parameter in HALlab fluctuates quite a bit. There are
no overloads (red lines) recorded.
b) When I use the input, rate is spot on 1.000000
for the entire duration, but I get frequent glitches
along overload/red-lines periodically.
Anything come to mind. I can post a screenshot of
case b) with one of the overloads opened for detailed
info, or should I mail that off-list?
Thanks!
--- Jeff Moore wrote:
>
> On Aug 15, 2006, at 4:59 PM, peoplestank wrote:
>
> > Is there any documentation explaining the data
> in the HALLab
> > telemetry window.
>
> There is no documentation, per se, but you do have
> the source code
> right there on your machine. That plus knowing that
> the telemetry is
> logging events that happen during a work cycle of
> the IO thread, you
> can figure a lot of it out.
>
> You can also ask questions here. I'm happy to help
> you interpret the
> telemetry.
>
> > Also, I can't figure out how to enable the latency
> tracing function
> > (which is really what I'm looking for), any help?
>
> HALLab has to be run as root to enable the latency
> tracing.
>
> --
>
> Jeff Moore
> Core Audio
> Apple
>
>
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