NAudio device enumeration stops working when combined with AudioSwitcher

[MortInfinite]

With NAudio commit 420e607 or NAudio NuGet version 1.8.5, I receive the following exception, when trying to create a new instance of MMDeviceEnumerator.

System.InvalidCastException: 'Unable to cast object of type 'System.__ComObject' to type 'NAudio.CoreAudioApi.Interfaces.MMDeviceEnumeratorComObject'.'

The problem occurs if calling the following code:

var coreAudioController = new AudioSwitcher.AudioApi.CoreAudio.CoreAudioController();
var deviceEnumerator = new NAudio.CoreAudioApi.MMDeviceEnumerator();

The problem does not occur if calling the following code:

var deviceEnumerator = new NAudio.CoreAudioApi.MMDeviceEnumerator();

It appears that AudioSwitcher interferes with the creation of the NAudio.CoreAudioApi.Interfaces.MMDeviceEnumeratorComObject object that NAudio uses for device enumeration.

Since this problem only occurs when using both AudioSwitcher (Version 3.0.0) and NAudio, I don't know if this is the correct place to report the problem or if I should post it in the AudioSwitcher project.

[markheath]

Hmm, not sure why that might be happening. Feel free to ask over at AudioSwitcher to see if they can explain what's going on.

[XySoftNeil]

The work around is to use the AudioSwitcher CoreAudioController members/methods instead. GetPlaybackDevices, and DefaultPlaybackDevice, etc.

[MultiverseBoy]

Same problem here. Tried to use another library CSCore instead of NAudio, the same problem shows. So I assume the problem is AudioSwitcher. I need AudioSwitcher to set the default devices. And the NAudio to do the detail settings, thought it would work. Bad luck.

[snippyy]

Same problem but i solved it. The AudioSwitcher.AudioApi.CoreAudio has conflict with NAudio.CoreAudioApi, you need to switch the order. set the AudioSwitcher.AudioApi.CoreAudio under the NAudio.CoreAudioApi.

[MortInfinite]

Same problem but i solved it. The AudioSwitcher.AudioApi.CoreAudio has conflict with NAudio.CoreAudioApi, you need to switch the order. set the AudioSwitcher.AudioApi.CoreAudio under the NAudio.CoreAudioApi.

I stopped using NAudio, so I can't check if the workaround solves the problem for me, but I hope your suggestion can help others.

[KWB]

@snippyy Same problem here, but what exactly do you mean by "set the AudioSwitcher.AudioApi.CoreAudio under the NAudio.CoreAudioApi."

Can you give me a hint please.

[TYLOGIC]

@snippyy Same problem here, but what exactly do you mean by "set the AudioSwitcher.AudioApi.CoreAudio under the NAudio.CoreAudioApi."

Can you give me a hint please.

Make sure you are initializing MMDeviceEnumerator before initializing CoreAudioController. Just had this issue and switching the order solved it. I however have not tested the application fully to determine if it will run into other issues with both trying to access COM.