[wdmaudiodev] AVStream on Vista
- From: "Andrew Sha" <universalkludge@xxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Mon, 27 Feb 2006 13:32:51 -0600
Hi guys,
I developed an audio driver that is implemented as an AVStream minidriver.
It works fine on XP, but not on Vista. I got a hint to implement the
KSPROPERTY_AUDIO_POSITION property. It sort of helps - as far as I keep the
PlayOffset equal to WriteOffest (kind of kludge), it seems to work fine. But
when I report the real PlayOffset that is behind the WriteOffset about 100
mS, the situation is screwed - after submitting of 30 mS of the PCM data a
player issues KSPROPERTY_AUDIO_POSITION request endless, probably waiting on
the PlayOffset to be advanced. So how to instruct a player (either the WMP
or the graphedit) about a portion of data that is needed to be pre-buffered
by my driver? My first guess was the KSPROPERTY_AUDIO_LATENCY property will
do the trick, but it is not requested at all.
Any ideas?
TIA
Andrew
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