[wdmaudiodev] Re: Vista 5.1 speaker mode question
- From: Hakon Strande <hakons@xxxxxxxxxxxxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Wed, 14 Mar 2007 15:08:46 -0700
If it is the Windows Vista HD Audio class driver you are running we use the HD
Audio codec's pin configuration default values to determine the channel mask of
the multi-channel device through pin config sequence numbers in the logical
device association. If a system vendor has set the pin config values of the
integrated HD Audio device to indicate that the 5.1 device uses side speakers
then we expose that to the OS when it asks the driver through the channel
config property request but if the system vendor uses the pin config sequence
values in the multi-channel device association to indicate that the 5.1 system
has rear speakers the HD Audio class driver will expose that to the OS as the
channel mask for that device instead.
See the chapter "Speaker Configurations" in the HD Audio pin configuration
programming guidelines document here for the background on how we interpret pin
config values into speaker configurations in the HD Audio class driver:
http://www.microsoft.com/whdc/device/audio/PinConfig.mspx
If your repro is not with the class driver and/or not with HD Audio solutions
then I think you'll have to ask the driver developers who created the drivers
you are using why they expose different 5.1 configurations because Windows
Vista uses the channel mask information provided by the driver to decide what
type of multi-channel device we are dealing with.
Sincerely,
Hakon Strande | Windows Sound Team PM | (p) 425.705.0637
-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Mike Preston
Sent: Tuesday, March 13, 2007 7:44 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Vista 5.1 speaker mode question
I have a question regarding side vs. rear speakers in 5.1 mode in the
Speaker Setup wizard on Vista. I've noticed that on different systems
that support 7.1 (i.e. both side and rear speakers are present), on some
systems, 5.1 mode uses the side speakers, while on other systems, 5.1
mode uses the rear speakers. How does Vista determine which to use? If
anyone has any info on this, it would be greatly appreciated.
Thanks,
Mike Preston
--
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| Mike Preston | Home/Office: (360)756-1655 |
| E-mail: mike@xxxxxxxxxxxxxxxxxxx | Cell: (360)303-9331 |
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| likely to find himself in places no one has ever been. |
| -- Alan Ashley-Pitt |
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