Identifying subunits

Hi,

My system has a RealTek HD onboard. Vista shows that the microphone endpoine has a microphone boost controller. I am writing an app that tries to identify this microphone boost controller. The subunit type I get from the mic boost IPart instance is KSNODETYPE_VOLUME. In the same topology also resides the microphone endpoint volume controller. I need to distinguish a mic boost subunit from the endpoint volume controller subunit. Is there a reliable way to do this that will work for all audio devices and all languages?

Thanks,

[544 byte] By [Yoedhana] at [2008-1-10]

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# 1

You can use IPart::GetName to see what the driver calls the part - sometimes this is clear ("Mic Boost").
http://msdn2.microsoft.com/en-us/library/ms679058.aspx

Be aware, some mic boosts are exposed as KSNODETYPE_LOUDNESS subunit types rather than _VOLUME.
http://msdn2.microsoft.com/en-us/library/ms789818.aspx

What I would suggest doing is finding all the KSNODTYPE_VOLUME nodes in the path; using IAudioEndpointVolume :: SetMasterVolumeLevel to change the endpoint volume; and seeing which KSNODETYPE_VOLUME was affected. That's the endpoint volume controller, and that strategy should work for all audio devices.

Maurits at 2007-10-3 >

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