[wdmaudiodev] Re: [EXTERNAL] LFX APO on Windows 7 x64

  • From: "Matthew van Eerde" <dmarc-noreply@xxxxxxxxxxxxx> (Redacted sender "Matthew.van.Eerde" for DMARC)
  • To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
  • Date: Tue, 10 Dec 2019 16:23:34 +0000

The wFormatTag values are defined in mmreg.h. 85 = 0x55 = WAVE_FORMAT_MPEGLAYER3

From: Artem<mailto:smirnoff.artem@xxxxxxxxx>
Sent: Tuesday, December 10, 2019 12:03 AM
To: wdmaudiodev@xxxxxxxxxxxxx<mailto:wdmaudiodev@xxxxxxxxxxxxx>
Subject: [EXTERNAL] [wdmaudiodev] LFX APO on Windows 7 x64

Hi!

I have an APO (that does some sound virtualization stuff) in LFX on
Windows 7 x64 and on some machines windows continuously calls this
(for stereo source):

->VirtualAPO()
->Initialize()
->IsInputFormatSupported()

Input format:
guidFormatType: 3
dwSamplesPerFrame: 2
dwBytesPerSampleContainer: 4
dwValidBitsPerSample: 32
fFramesPerSecond: 48000
dwChannelMask: 3
Output format:
guidFormatType: 3
dwSamplesPerFrame: 2
dwBytesPerSampleContainer: 4
dwValidBitsPerSample: 32
fFramesPerSecond: 48000
dwChannelMask: 3
->~VirtualAPO()

This repeats many times and format seems to be the same. Once I saw
something like (not sure what 85 means):

Input format:
guidFormatType: 85
dwSamplesPerFrame: 2
dwBytesPerSampleContainer: 0
dwValidBitsPerSample: 0
fFramesPerSecond: 44100

I have implemented IsInputFormatSupported() and it basically accepts
all input channel configurations and then calls base class, but
skipped implementation of IsOutputFormatSupported().
Everything works perfectly on Windows 10 and some Windows 7 PCs, but
on some Windows 7 PCs I see the behavior described above. I can't see
the difference between OSs,
all updates are there and build numbers are the same.

Please advice something, I've already cracked my head :) I know that
Windows 7 is going away, but we have requirements to support it.

regards,
Artem
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