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[jmone]

On my HTPC, I have
- MC's DSP set to upmix to 5.1, upsample to 96khz, and 24-Bit (presented as 32-Bit in Output Mode Setting)
- MC set to WASAPI (or WASAPI Event)
- Win7 32-Bit Ultimate
- ATI HD5450 with HDMI out to Yami Receiver

When I try to play a 2ch 88.2Khz, 24-Bit track MC says my HW does not support it and wants to downsample to 48KHz.  After some testing of the folloiwng upscaling settings in DSP, I get:
- MC: Using WASAPI: DSP Set to Upscale/Mix etc to 2ch 88.2KHz or 96KHz 24-Bit = PASS
- MC: Using WASAPI: DSP Set to Upscale/Mix etc to 6ch 88.2KHz or 96KHz 16-Bit = PASS
- MC: Using WASAPI: DSP Set to Upscale/Mix etc to 6ch 88.2KHz or 96KHz 24-Bit = FAIL
- MC: Using DIRECTSOUND: DSP Set to Upscale/Mix etc to 2ch 6ch 88.2KHz or 96KHz 24-Bit = PASS

I know my HW supports 6CH 96KHz 24-Bit (padded in 32-Bit) over WASAPI as it works fine from Arcsoft TMT, FFDSHOW etc and I can also test it from within Windows.

Thanks
Nathan

[jmone]

Here is some screens shots of 6ch 96KHz, 32 Bit working fine from FFDSHOW --> Reclock Audio Renderer over WASAPI

[Matt]

The screenshots you show that work are reporting 32-bit, not 24-bit.

In Media Center, check the option to present 24-bit data in a 32-bit package for WASAPI.

[jmone]

Sorry if I did not articulate this well (updated the wording above) "Present 24-Bit data in a 32-Bit packages" is checked in MC (as my card only takes 32-Bit).  MC Playback works fine with all combos of in the DSP for CH, Sampling Rate, and BitDepth but NOT when set to 6ch at 96khz & 24Bit, if I change in DSP any ONE to either 2ch, 48khz, or 16 bit it works.  Also works if I change to DirectSound.

EDIT - FYI Setting the DSP to 32-Bit does not work either.

[Matt]

Could you send me a log showing the failure?

Also, could you try a few different WASAPI buffer sizes?

That format is working fine here, so I think your driver is rejecting the format for some reason.  The log might offer a hint.

Thanks.

[jmone]

Thanks matt - I'm away for a couple of days and will post logs etc then

[jmone]

Well - I'll be (I must be getting old, not testing properly, or Matt has made an undocumented change!).  Anyway, I updated to the latest version and now I find:
- "WASAPI (Event Style)" works fine
- My cards (two machines) will now accept both 24-Bit and 24-Bit presented as 32-Bit (bit not 32-Bit)
- "WASAPI" still fails with 6ch 96khz 24-bit (log attached) but I'll just use "WASAPI (Event Style)" instead!

Thanks
Nathan

[Matt]

I'll just use "WASAPI (Event Style)" instead!

Our recommendation is to use "WASAPI (Event Style)" instead of regular "WASAPI" on any hardware capable of supporting the event style.

More information here:
http://wiki.jriver.com/index.php/WASAPI