How to detect microphone usage on OS X?

Question

Is there a way to detect when the microphone of my Mac is in use? Similar to what Mikro Snitch does? Can this be done in Cocoa?

Answer 1

I'm working on go module that detects camera/microphone state (using cgo) and here is my crafted Objective-C implementation for IsMicrophoneOn(): https://github.com/antonfisher/go-media-devices-state/blob/main/pkg/microphone/microphone_darwin.mm

I used kAudioHardwarePropertyDevices to get all audio devices (microphones + speakers) and then [AVCaptureDevice deviceWithUniqueID:uid] to filter out only microphones by device UID.