[wdmaudiodev] Re: Changing default endpoint and speaker configuration on Vista

  • From: SP <djm@xxxxxxxxxxxxxxxx>
  • To: wdmaudiodev@xxxxxxxxxxxxx
  • Date: Mon, 16 Oct 2006 21:23:01 -0500

I have a somewhat related question.

Since we are no longer able to automatically change the default audio devices in Vista. What is the best method to launch the Vista UI to allow the user to change it?

Jim Barber wrote, On 10/16/2006 9:04 PM:
Hi Hakon,

Just to be clear, are you saying that MS wants to avoid IHV
control panels/GUI's changing those parameters? Mike wasn't referring
to 3rd-party recording applications. That would result in the bulk of the
audio settings being done in the IHV app and then the user being required to
go to the MS property pages only to change the default endpoint and/or
the output mode. Is this the intent?

Thanks,
--jim

At 06:17 PM 10/16/2006, Hakon Strande wrote:

These are user settings only in Vista. We want to avoid applications
fighting over what device is the default and what speaker config it
thinks the user likes.


The device driver exposes the multi-channel formats the hardware
supports and the OS speaker config exposes these to the user selecting
the configuration with the highest number of channels as the default.

The audio endpoints get set to default based on a prioritized list
starting with Speakers at the top on the render side:

1. Speaker
2. Headphone
3. S/PDIF

As an audio device driver you expose the logical devices supported by
your audio device and the user controls what device is actually used.

Hakon Strande
PM Integrated, Internal, External, and Wireless Audio Devices
MediaTech/DMD/Windows Client/Microsoft

-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Michael R.
Preston
Sent: Monday, October 16, 2006 5:09 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Changing default endpoint and speaker
configuration on Vista

Can anyone (possibly someone from Microsoft) answer this?

I've been looking through all the MMDevice-related API documentation. In IMMDeviceEnumerator, there's a function called GetDefaultAudioEndpoint() to get the default audio endpoint. How can you programmatically change the default audio endpoint? There's no corresponding SetDefaultAudioEndpoint() function. Similarly, there doesn't seem to be any function to set the endpoint's speaker configuration. I've tried using the high-level DirectSound interface, or calling Activate on the IMMDevice interface to get a pointer to IDirectSound, but neither of these seems to have any effect. The call to SetSpeakerConfig() succeeds, but doesn't actually change anything. Is there any way other than by using the Sound control panel?

Thanks,
Mike Preston
--
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| E-mail: mike@xxxxxxxxxxxxxxxxxxx |        Cell: (360)303-9331 |
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