[wdmaudiodev] Re: Need help in Passing a test case from KS-Position test
- From: Gaurav Khuntale <gauravkhuntale@xxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Wed, 30 Apr 2014 12:49:16 +0530
Hi Matthew,
Thanks for the reply.
Actually i tried the same test with MSVAD sample driver and it is passing
it. My driver's GetPosition() implementation is exactly same as MSVAD
sample driver but still it is failing in that test case. Like MSVAD sample
driver, i am using a unit of milliseconds to calculate byte position in
GetPosition() function.
Thanks,
Gaurav
On Tue, Apr 29, 2014 at 10:12 PM, Matthew van Eerde <
Matthew.van.Eerde@xxxxxxxxxxxxx> wrote:
> A standard deviation of 0.3 milliseconds is consistent with a position
> counter that has a granularity of 1 millisecond, which is too coarse. Your
> position counter should have a granularity of 1 sample.
>
>
>
> *From:* wdmaudiodev-bounce@xxxxxxxxxxxxx [mailto:
> wdmaudiodev-bounce@xxxxxxxxxxxxx] *On Behalf Of *Gaurav Khuntale
> *Sent:* Tuesday, April 29, 2014 8:59 AM
> *To:* wdmaudiodev@xxxxxxxxxxxxx
> *Subject:* [wdmaudiodev] Need help in Passing a test case from
> KS-Position test
>
>
>
> Hello,
>
> I am working on a virtual audio driver which is based on wave
> cyclic port driver. The driver similar to the MSVAD sample driver from the
> DDK. I am facing an issue with understanding a test from KS position test.
> Following are the extracts from the test log:
>
>
>
> Collected 6857 good data points which covers 80828.491 ms
>
> Detected 0 glitches in 81 seconds
>
> Specified sample rate = 176400.000 bytes/sec, 44100.000 samples/sec
>
> Calculated sample rate = 176400.004 bytes/sec, 44100.001 samples/sec
>
> Sample rate drifting ratio = 0.000002 %
>
> Average position noise magnitude = 0.279960 ms
>
> STD of position noise = 0.332027 ms
>
> 0.247922% of position noise is larger than 0.8 ms
>
> Largest short term (2 seconds) position noise average is 0.000547ms
>
> FAIL: STD of position noise is 0.332027ms which is larger than 0.3ms
>
> End Case: ID 16.26:1.8 : FAIL : Standard Streaming\Rendering Performance
> Tests\Position Drift and Jitter for AEC : [Mon Apr 28 15:50:02 2014]
>
>
>
> The GetPosition() implementation is similar to the one in MSVAD. I am not
> getting what the test wants to say and what it is expecting. So can anyone
> please explain it to me?
>
> Thanks.
>
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