APK to know users' choice of audio output (Speaker or Rift Headphones)?

Hi there,

Using this: https://developer.oculus.com/documentation/pcsdk/latest/concepts/pcsdk-intro/

Is there any APK available to know which audio output the user chooses in Windows Setting and in Oculus PC version?

Specifically, in Windows Sound Setting, we could choose to use "Speaker" or "Rift Headphones" and in Oculus PC version we could choose to use "Rift Headphones" and "Use Windows Setting". 

We want to adjust the audio output in our app according to users' choices.

Any help would be highly appreciated.