[wdmaudiodev] Eluding glitch
- From: Robert Bielik <robert@xxxxxxxxxxx>
- To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Mon, 06 Feb 2012 15:34:40 +0100
Hi all,
I've developed a VAD solution that "pulls" audio data via a ring buffer in the
device through a appl. specific transport (via DeviceIoControl) and it mostly works fine,
but when having certain frame sizes I get glitches I have no clue from where they emanate.
With a frame size of 3528 bytes (441 frames á 8 bytes) everything works like a
clock (this is incidentally the Interval sent to SetNotificationFreq).
When using a frame size on the pull side of 8192 bytes (1024 frames á 8 bytes),
I can see that several CopyTo calls add up totalling 8192 bytes during each frame
period. The audio plays fine aside from the fact that each 10 seconds, a very short
glitch occurs (like a dropout), and I have not been able to pinpoint how or why. My
ringbuffer neither underruns, nor overruns, nor can I see a difference in the CopyTo
behavior.
I'm at a loss here. Does anyone have any idea what to check ?
TIA
/Rob
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