How to enumerate audio endpoint (IMMDevice) properties on your system

re: How to enumerate audio endpoint (IMMDevice) properties on your system

Maurits [MSFT] — Mon, 04 Jun 2012 04:18:29 GMT

Each endpoint has two property stores; the "endpoint property store" displayed above, and the "effects property store." The endpoint property store is exposed to applications, but the effects property store is limited to:

1) the audio driver

2) the audio engine

3) the Sound control panel.

So only the user can view / change settings in the effects property store, and that only through the Sound control panel.

I'm interested in why your application needs to know about the effects property store. Can you share some details on your application? You can post it at the Windows Pro Audio forum

social.msdn.microsoft.com/.../threads

Or you can email me directly: mateer at microsoft dot com

re: How to enumerate audio endpoint (IMMDevice) properties on your system

Kevin Choi — Mon, 04 Jun 2012 01:13:17 GMT

Hello,

I am trying to write a program to set audio properties of endpoint devices. I've seen that there is EndpointDeviceVolume API out for controlling the volume, but I want to see if it is possible to programmatically set properties like Enhancements. Is there a way to enumerate the properties and get/set values using IMMDevice?

Thanks

Kevin

re: How to enumerate audio endpoint (IMMDevice) properties on your system

Maurits [MSFT] — Tue, 17 Apr 2012 15:10:48 GMT

Only the user can enable or disable audio endpoints, and that only via the Sound control panel.

re: How to enumerate audio endpoint (IMMDevice) properties on your system

parallel — Tue, 17 Apr 2012 10:31:32 GMT

how can I enable a disabled endpoint device ,are there any api I can use?

re: How to enumerate audio endpoint (IMMDevice) properties on your system

Maurits [MSFT] — Sat, 10 Sep 2011 16:23:23 GMT

IMMDevice properties were introduced in Vista; XP is a very different beast.

re: How to enumerate audio endpoint (IMMDevice) properties on your system

Maurits [MSFT] — Sat, 10 Sep 2011 16:22:43 GMT

That property is not publically defined, and you should not rely on it.

You can identify whether render and capture devices are on the same hardware by doing the device topology "connector dance" and the PKEY_Device_InstanceId property. For example, see:

blogs.msdn.com/.../sample-find-out-if-your-default-playback-and-capture-devices-are-on-the-same-hardware.aspx

re: How to enumerate audio endpoint (IMMDevice) properties on your system

Matthew Copeland — Fri, 29 Jul 2011 13:33:33 GMT

Forgot to also ask if this value is the same in XP and Vista?

re: How to enumerate audio endpoint (IMMDevice) properties on your system

Matthew Copeland — Fri, 29 Jul 2011 13:23:11 GMT

Hi,

Writing some code to identify paired capture/render devices, ie a headset.

My big assumption is the following value

{b3f8fa53-0004-438e-9003-51a46e139bfc},2

is a constant which always maps to the device ID as reported by WMI.

Is my assumption correct?