[wdmaudiodev] timing issues in msvad
- From: mudeem siddiqui <mudeem@xxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Thu, 15 Dec 2005 17:51:32 -0800 (PST)
Hi,
I am working on a virtual audio driver. I am using msdev from windows DDK
and building my drivier from that. The problem I am facing is that somehow
after very some time I don't get the number of samples expected in that time
frame. The default Interval set is that of 10 ms in the SetNotificationFreq
function. Using 10 ms interval, in the CopyTo function I get 40 ms worth of
data i.e 3528 bytes in 42 ms. If I increase the Interval the resolution
becomes better. So I increaed the Interval to 40 ms. Now what happens is after
40 ms CopyTo function is called 4 times giving me 882 bytes in each call (that
I don't understand as well why it does not give me 3528 bytes in one call) And
every so often after 40 ms it makes 3 calls instead of 4 calls to CopyTo
function and gives 882 bytes in each call.. So I am short of 882 bytes if data
in that time interval.
In short I would like to get 3528 bytes in 40 ms but I am not getting
that... Any idea why this would be happening? And can anyone give me some
insight into how GetPosition, CopyTo fucntion and the notify functions are
related.
Regards
Mudeem
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