[wdmaudiodev] Re: PortClass audio driver: device initiated change of audio device default format properties

  • From: "noise@xxxxxxxx" <noise@xxxxxxxx>
  • To: wdmaudiodev@xxxxxxxxxxxxx
  • Date: Fri, 19 Oct 2018 07:22:18 +0200

Mhhh, thanks again, I thought about that, but then the portclass can't control 
the devices sample rate anymore...
The device has a sample rate selector, controllable from the device's own UI 
and from the host (here portclass, but further also ASIO).

What I think it should do, if possible, is only switching the default format. 
If thats not possible then the above approach is OK and we let control the 
sample rate only from the device and the ASIO control panel.
(portclass anyway is only an addition for the user to use the audio device as a 
youtube player. The device itself is a multichannel pro audio interface which 
primarily is used via ASIO.)

Viele Grüße/Cheers,
Hagen.

On 18.10.2018, at 22:16, Matthew van Eerde (Redacted sender 
"Matthew.van.Eerde" for DMARC) <dmarc-noreply@xxxxxxxxxxxxx> wrote:

Yes.

And if the external sound device has a particular sample rate selected – say, 
44.1 – it is your audio driver’s job to tell Windows that it ONLY supports 
44.1.

From: wdmaudiodev-bounce@xxxxxxxxxxxxx <wdmaudiodev-bounce@xxxxxxxxxxxxx> on 
behalf of noise@xxxxxxxx <noise@xxxxxxxx>
Sent: Thursday, October 18, 2018 1:14:24 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: PortClass audio driver: device initiated change of 
audio device default format properties

Thanks Matthew, I am having a look at this!

But wouldn't this only retrieve the entire set of formats my device supports?

Viele Grüße/Cheers,
Hagen.

On 18.10.2018, at 22:00, Matthew van Eerde (Redacted sender 
"Matthew.van.Eerde" for DMARC) <dmarc-noreply@xxxxxxxxxxxxx> wrote:

If your format support changes, raise a KSEVENT_PINCAPS_FORMATCHANGE event. 
Windows will invalidate all currently running streams and requery format 
support.

From: wdmaudiodev-bounce@xxxxxxxxxxxxx <wdmaudiodev-bounce@xxxxxxxxxxxxx> on 
behalf of noise@xxxxxxxx <noise@xxxxxxxx>
Sent: Thursday, October 18, 2018 12:01:29 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] PortClass audio driver: device initiated change of 
audio device default format properties

Hi,

I have an external sound device which - beneath others - can control the 
sample rate.
To support Windows audio we are using a portclass driver.
Is it possible to promote a sample rate change from the device switching our 
portclass drivers current "default" format? (at least when the device is 
streaming...?!)

Thanks, for any suggestion where to look!

Viele Grüße/Cheers,
Hagen.

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Viele Grüße/Cheers,
Hagen.
__________________
dynamic acoustics e.U.
Weyringergasse 37/3/11a
1040 Vienna / Austria
+43 680 1268 751

FN: 326751t

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