[wdmaudiodev] Re: Multichannel test playback in Win10

  • From: Harry Graham <HarryGraham@xxxxxxxxxx>
  • To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
  • Date: Tue, 27 Oct 2015 20:16:50 +0000

According to MS docs, the size of 64 indicates PCMWAVEFORMAT, which is obsolete.

Harry

-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Eugene Muzychenko
Sent: Tuesday, October 27, 2015 10:58 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Multichannel test playback in Win10

Hello!

In Vista, Win7/8/8.1, my driver successfully allows multichannel (up to 8) test
tone playback (the "Test" button in the "Advanced" tab of audio endpoint
properties).

But in Win10 (10.0.10240) most test playbacks fail with "Failed to play test
tone" message.

From driver's log, I see that a stream with a proper (6 or 8) channels is
successfully created, then its state changed from STOP to ACQUIRE, then to
PAUSE, then back to ACQUIRE and finally to STOP, and the stream is released. No
data are submitted for playback.

Is it due my driver problem, or due to Win10 problem?

After stream creation and termination, some property requests are issued. In
particular, KSPROPERTY_PIN_PROPOSEDATAFORMAT is issued, with
KSDATAFORMAT_SUBTYPE_PCM and KSDATAFORMAT_SPECIFIER_WAVEFORMATEX,
but FormatSize is 64 while sizeof (KSDATAFORMAT_WAVEFORMATEX) is 82.

What could such request mean? How to interpret
KSDATAFORMAT_SPECIFIER_WAVEFORMATEX with FormatSize equal to 64? Now my driver
fails these request with STATUS_NO_MATCH.

KSPROPERTY_PIN_PROPOSEDATAFORMAT tests in gaudit from WLK 1.6.8367 show no
errors.

Regards,
Eugene

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