machine air,
cpu:Intel(R) Core(TM) i5-8210Y CPU
os:10.15.4
I use AudioObjectAddPropertyListener to listen speaker and micphone change. But I can receive the output or input device changed notify from the register listen after I open it for 10 seconds. Then I call api the check input or output device number ,the number will be 0.
Using other os like 10.14, I can not see this issue.