[wdmaudiodev] More Vista LFX channel conversion problems

  • From: "Michael R. Preston" <mike@xxxxxxxxxxxxxxxxxxx>
  • To: wdmaudiodev@xxxxxxxxxxxxx
  • Date: Wed, 27 Sep 2006 11:49:26 -0700

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?

|            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         |
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|                     -- Alan Ashley-Pitt                       |

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