[wdmaudiodev] Re: Receiving unmodified audio data in Vista
- From: Frank Yerrace <Frank.Yerrace@xxxxxxxxxxxxx>
- To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Fri, 23 Oct 2009 17:05:04 +0000
I don't quite have an answer on this, but do you know whether this happens on
Vista SP1? Or Windows 7? This might help us narrow things down.
Also, just to help me understand the impact, does this actually affect some
scenario or are you looking at this just to check the fidelity of the audio
core's processing? Obviously in general you can't rely on receiving unmodified
data since at any time another sound might mix in or the user might change
audio system effects settings.
Frank Yerrace
Microsoft
This posting is provided "AS IS" with no warranties, and confers no rights.
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of KS
Sent: Friday, October 23, 2009 7:02 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Receiving unmodified audio data in Vista
Hi,
I'm trying to receive unmodified audio data in my audio driver in Vista. What
I've already done is to disable the APO, set the format of the endpoint to the
same format as the media file, and set all relevant volume control to 0dB
level. I'm using WMP to play the audio file which is a wave file.
What I'm seeing so far is that I can receive the unmodified data if the format
is at 96kHz 24bit, but not when the format is at 48kHz 16bit. Is there
additional settings that need to be set before a driver can receive 48kHz 16bit
data without modification, or is there some background processing that is done
in the audio stack for 16bit audio that resulted in drivers not being able to
receive unmodified audio data for 16bit?
Thanks
KS
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