[wdmaudiodev] Re: Queries on Virtual Audio Driver
- From: "Jeff Pages" <jeff@xxxxxxxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Thu, 18 Aug 2005 09:15:19 +1000
I think the kernel mixer always expands the audio data to the maximum bit depth
and channel count that the driver supports.
Jeff
----- Original Message -----
From: preeti rubdi
To: wdmaudiodev@xxxxxxxxxxxxx
Sent: Wednesday, August 17, 2005 7:41 PM
Subject: [wdmaudiodev] Queries on Virtual Audio Driver
Hi,
Im new to audio driver developemnt. I have to write a virtual Audio
Driver,which at its lower edge, will stream audio over a wireless transport to
a remote sink.The driver is for Win2000 and WinXP platforms.
I started with the MSVAD(simple) sample in the XP DDK.I have a few queries.
1)Am I right in starting with MSVAD as the base. ie implementing
IMiniportWaveCyclic interface instead of IMiniportWavePci.
2)In the MSVAD sample,SetFormat() indicates nChannels = 2 and wBitsPerSample
= 16 ,regardless of the file that is played by the application.Thus the Frame
size is the same for all .wav files of a particular sampling frequency.
Ideally , for an interval of 10 msec,I should get a frame of 640 bytes for a
16khz, 16bit, stereo file and 320bytes for a 16khz, 16bit, mono file? How do i
do this?
Would really appreciate help on this.
Thanks,
Preeti.
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