[wdmaudiodev] Re: Windows 7 wave cyclic driver

  • From: "Matthew van Eerde" <dmarc-noreply@xxxxxxxxxxxxx> (Redacted sender "Matthew.van.Eerde" for DMARC)
  • To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
  • Date: Wed, 1 Mar 2017 21:21:04 +0000

OK, so you’re providing stereo 16-bit 48 kHz data to Windows; Windows is 
converting this to stereo floating-point 48 kHz internally in the Windows audio 
engine; then converting it again to stereo 16-bit 44.1 kHz when handing it to 
the app.



All this is perfectly normal, though I wonder why the app asked for 44.1 kHz 
specifically.



From: Farrah Avanesov<mailto:favanesov@xxxxxxxxxxxxx>
Sent: Wednesday, March 1, 2017 1:16 PM
To: wdmaudiodev@xxxxxxxxxxxxx<mailto:wdmaudiodev@xxxxxxxxxxxxx>
Cc: timr@xxxxxxxxx<mailto:timr@xxxxxxxxx>
Subject: [wdmaudiodev] Re: Windows 7 wave cyclic driver



On Wed, 2017-03-01 at 19:59 +0000, Matthew van Eerde wrote:

What WAVEFORMATEX is being passed to your NewStream implementation,
and what WAVEFORMATEX is in the “fmt ” chunk of the captured .wav
file?

From WinDbg:
[TestDataFormat] PCMEX - Frequency: 48000, Channels: 2, bps: 16,
ChannelMask: 3

"fmt" sub-chunk" from .wav file:
Subchunk1 ID:   0x666d7420
Subchunk1 Size: 0x12000000
AudioFormat:    0x0100
NumChannels:    0x0200
SampleRate:     0x44ac0000 <-- which is 44100 and the problem?
ByteRate:       0x10b10200
BlockAlign:     0x0400
BitsPerSample:  0x1000




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