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Help with HALLab telemetry
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Help with HALLab telemetry


  • Subject: Help with HALLab telemetry
  • From: "Stephen F. Booth" <email@hidden>
  • Date: Thu, 23 Sep 2010 08:37:09 -0700

I'm debugging a strange issue with my audio player and I'm not sure how to interpret the HALLab telemetry results.  The problem I'm having is that as soon as I start the device I immediately receive continuous overload notifications.  So far the problem seems to only occur when my player is launched with the device sample set to 176.4 or 192.0; at 96.0 and below everything works as expected. I should also probably mention that for FW devices everything appears to work OK; I'm only seeing the problem with USB devices. The final piece of strangeness is that the problem only happens when I perform IO in a non-mixable format; if I stick with floats playback is fine.

Here is a representative screenshot of the HALLab telemetry:
http://img838.imageshack.us/img838/6475/screenshot20100923at822.png

I notice the <-Write error 0xE00002E8. I'm not certain what this error indicates; does this mean the device is returning a kIOReturnOverrun error?  What do these telemetry data indicate?

Thanks,
Stephen
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