[wdmaudiodev] Re: More Vista LFX channel conversion problems

  • From: "Michael R. Preston" <mike@xxxxxxxxxxxxxxxxxxx>
  • To: wdmaudiodev@xxxxxxxxxxxxx
  • Date: Thu, 28 Sep 2006 15:00:06 -0700

Jeff,
Thanks for your response. I have not been debugging AudioDG directly. I have strictly been debugging the APO. I am seeing this behavior using Windows Media Player 10 on Vista RC1 (build 5600), using the speaker fill sample code which wraps the built-in APO. I would think it's not a problem with Media Player, and it doesn't look like it's an APO problem because the LFX is never asked if it supports 6->8 channel conversion. Are you recommending I debug the AudioDG process to see what it's doing, or is that something you guys would rather take a look at? As for mono content, I know we can handle it in our APO in the manner you described if we decide to support it, but I'm not too worried about it.


Thanks,
Mike

Jeffrey Hoekman wrote:
The sample code which you're referring to does not speaker-fill for mono
content.  You will need to modify IsIn{Out}putFormatSupported and likely
LockForProcess/ValidateAndCacheConnectionInfo and APOProcess to make it
work for mono.  I'm not sure about speaker-fill for >2-channel content
-- Serge may be able to comment on that.

If you're debugging AudioDG and not seeing the correct formats in the
'format-supported' calls it's likely the initial format negotiation
between the client app and AudioSrv (the service) is not resolving
properly.  Instead debug the IsInputFormatSupported API from within
AudioSrv to determine the original formats queried for render.  This is
generally the first line of negotiation with any player client.

-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Michael R.
Preston
Sent: Wednesday, September 27, 2006 11:49 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] More Vista LFX channel conversion problems

Frank/Jeff,
    Well, my last post may have been a little premature.  The new APO
sample code was very helpful.  Since there was little documentation up
until this point, the new sample code definitely helped to better
understand how the APIs are to be used.  However, even with the new
sample code for speaker fill, I'm still seeing some LFX channel
conversion problems.  I didn't see them at first because I had only
tried doing speaker fill on stereo content.  Converting 2-channel
content to 6 or 8 channels works fine.  However, it looks like anything
other than stereo content is currently not compatible with speaker fill.

With mono, 4-channel, or 6-channel content, the APO is never given the
chance to do speaker fill. The number of input and output channels
always equals the output mode in these cases. There are a few use cases
that are less important (say converting mono system sounds to 6 or 8
channels), but the obvious need is to convert 6-channel content to 8
channels. If you're playing a DVD (which is 5.1 content) in a 7.1
speaker system, the LFX should be able to do speaker fill to make audio
come out the side speakers. With the way Vista is currently behaving,
it is impossible for an APO to do the channel conversion to support this. This seems to be a Windows problem and not an APO problem, since


the APO is never even asked if it supports 6 channels in, 8 channels
out.  I have tried this with RC1 (build 5600), and with a more recent
version, and the problem remains unchanged.  Can you check to see if
this is a known problem?

Thanks,
Mike
--
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-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | Mike Preston | Home/Office: (360)756-1655 | | E-mail: mike@xxxxxxxxxxxxxxxxxxx | Cell: (360)303-9331 | |~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~| | The man who follows the crowd will usually get no | | 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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