[wdmaudiodev] Re: Vista 5.1 speaker mode question
- From: Nick Gorohov <engkosha2001@xxxxxxxxx>
- To: wdmaudiodev@xxxxxxxxxxxxx
- Date: Wed, 14 Mar 2007 21:21:00 -0700 (PDT)
Mike, Hakon,
let's clear up the issue.
There are two schemas of speaker placement in 7.1:
Home Theater (Dolby classic) configuration and Wide configuration.
Though both are using SAME audio hardware, speaker placement in the room and
speaker configuration flags are different. There should be two different lines
in the speaker config selection dropbox.
In the wide configuration there is no rear speakers.
From the other hand Dolby 5.1 content does not have side channels, only rear.
Generally saying both pieces - audio mapper and decoder should do the right job
for correct output. 5.1 audio played on 7.1 classic config will be sounding in
different way depending what kind of compression is used.
Some useful info is here:
http://download.microsoft.com/download/9/c/5/9c5b2167-8017-4bae-9fde-d599bac8184a/SpkrConfig5.doc
Full capabilities HD audio (in the future) may carry up to 13.2 config audio
channels; but usually not more than 6 at the same time.
It would be good if Microsoft will include a correct audiodecoder output
testing in their Vista certification to keep Audio Standard right. Otherwise HD
audio will be too confusing for the overage user...
Nick Gorokhov,
Senior Engineer
E-mail: gnvj@xxxxxxxx
--- Mike Preston <mike@xxxxxxxxxxxxxxxxxxx> wrote:
> Hakon,
> Thanks for the valuable information. I just wanted to make sure
> we're talking about the same thing. I'm talking about a Speaker
> endpoint on an HD audio codec that supports 7.1, but is configured for
> 5.1 mode. Does the pin configuration you're talking about come from the
> verb tables in the BIOS? Is there an API for getting the codec's pin
> configuration that is available above the driver level? The only thing
> in the Core Audio API that is remotely related is the
> IAudioChannelConfig, but that only allows you to get the current
> configuration. It also seems to be unrelated to the jack information
> for the endpoint. Any suggestions?
>
> Thanks,
> Mike Preston
>
> Hakon Strande wrote:
> > 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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> | E-mail: mike@xxxxxxxxxxxxxxxxxxx | Cell: (360)303-9331 |
> |~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~|
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> | further than the crowd. The man who walks alone is |
> | likely to find himself in places no one has ever been. |
> | -- Alan Ashley-Pitt |
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