Error 0xE00002EE with PCI audio driver
Error 0xE00002EE with PCI audio driver
- Subject: Error 0xE00002EE with PCI audio driver
- From: Eugene Gavrilov <email@hidden>
- Date: Tue, 9 Sep 2008 16:33:49 +0400
Hello,
I'm developing an audio driver for a PCI device and faced a strange
issue: the audio is streaming properly without any artifacts or clicks
or glitches for the first 5-10 minutes. After that, I hear drop-outs
and clicks, and their amount increases dramatically. I tried to
analyze audio performance with HALLab and here's part of its output:
================
Start Offset Late Rate Now:samp Now:host In:samp In:host Out:samp
Out:host Wake:samp Wake:host Zero:samp Zero:host
(...)
144405.569 10.853 0.267 1.000000 28459303 144405.569 0 0.000 28459803
144415.969 28459305 144405.605
144416.466 10.896 0.496 1.000000 28459826 144416.466 0 0.000 28460315
144426.636 28459828 144416.502
144427.892 11.426 1.256 1.000000 28460375 144427.892 0 0.000 28460827
144437.303 28460377 144427.929
144437.554 9.662 0.252 1.000000 28460839 144437.554 0 0.000 28461339
144447.969 28460840 144437.589
!!! 144447.988 10.434 0.018 1.000000 28461339 144447.988 0 0.000
28461851 144458.636 28461341 144448.029
->Write
<-Write: Error: 0xE00002EE
->Over:
<-Over:
<-Cycle:
144459.247 11.259 0.549 1.000000 28461880 144459.247 0 0.000 28462366
144469.365 28461882 144459.283
144469.796 10.548 0.430 1.000000 28462386 144469.796 0 0.000 28462878
144480.032 28462388 144469.829
(...)
144737.338 11.712 1.306 1.000000 28475228 144737.338 0 0.000 28475678
144746.699 28475230 144737.372
144746.778 9.440 0.079 1.000000 28475681 144746.778 0 0.000 28476190
144757.365 28475683 144746.823
144757.641 10.863 0.276 1.000000 28476203 144757.641 0 0.000 28476702
144768.032 28476204 144757.675
!!! 144768.052 10.411 0.020 1.000000 28476702 144768.052 0 0.000
28477214 144778.699 28476704 144768.081
144778.828 10.775 0.087 1.000000 28477220 144778.828 0 0.000 28477728
144789.407 28477221 144778.863
144789.478 10.650 0.071 1.000000 28477731 144789.478 0 0.000 28478240
144800.074 28477733 144789.512
144800.469 10.991 0.396 1.000000 28478258 144800.469 0 0.000 28478752
144810.740 28478260 144800.503
=================
The lines with '!!!' were red in the output, and they contained error
0xE00002EE and overload. (Subsequent host buffers were not 512 bytes,
but 507 bytes). This error is only present after 5-10 minutes of audio
playback and it becomes very frequent in 5-10 seconds.
What does this error mean? According to IOReturn.h the error is
kIOReturnIsoTooOld ('isochronous I/O request for distant past'), but
why am I getting this error? I could not find any timestamp errors in
HALLab. I googled for this value in the Internet, but it seems this
error is returned for USB audio drivers, and I'm writing a PCI driver.
Any hints or tips?
Regards,
Eugene Gavrilov
Senior Software Engineer,
CEntrance, Inc.
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