Highlighting the running state of the mic with red tint

Author: dstd

micSwitch/AppDelegate.swift

@@ -66,11 +66,18 @@ class AppDelegate: NSObject, NSApplicationDelegate {
 
     private func updateMicStatus() {
         guard let button = statusItem.button else { return }
-        button.image = Audio.shared.micMuted ? micOff : micOn
+        switch Audio.shared.micMuted, Audio.shared.isRunning) {
+        case (true, false): button.image = micOff
+        case (true, true): button.image = micOffActive
+        case (false, false): button.image = micOn
+        case (false, true): button.image = micOnActive
+        }
     }
 
     private let micOn = NSImage(named: NSImage.Name("micOn"))
     private let micOff = NSImage(named: NSImage.Name("micOff"))?.tint(color: NSColor(red: 1.0, green: 1.0, blue: 1.0, alpha: 0.5))
+    private let micOnActive = NSImage(named: NSImage.Name("micOn"))?.tint(color: NSColor(red: 1.0, green: 0.3, blue: 0.3, alpha: 1))
+    private let micOffActive = NSImage(named: NSImage.Name("micOff"))?.tint(color: NSColor(red: 1.0, green: 0.3, blue: 0.3, alpha: 0.5))
     private var preferences: PreferencesViewController?
     private let statusItem = NSStatusBar.system.statusItem(withLength: NSStatusItem.variableLength)
     private var muteListenerId: Int = -1

micSwitch/Classes/AudioUtils.swift

@@ -24,6 +24,11 @@ struct AudioObjectAddress {
         mSelector: kAudioDevicePropertyDeviceNameCFString,
         mScope: kAudioObjectPropertyScopeGlobal,
         mElement: kAudioObjectPropertyElementMaster)
+
+    static var isRunning = AudioObjectPropertyAddress(
+        mSelector: kAudioDevicePropertyDeviceIsRunningSomewhere,
+        mScope: kAudioObjectPropertyScopeGlobal,
+        mElement: kAudioObjectPropertyElementMaster)
 }
 
 class Audio {
@@ -64,6 +69,20 @@ class Audio {
         }
     }
 
+    var isRunning: Bool {
+        guard let inputDevice = inputDevice else { return false }
+
+        var value: UInt32 = 0
+        var size = UInt32(MemoryLayout.size(ofValue: value))
+
+        let error = AudioObjectGetPropertyData(
+            inputDevice, &AudioObjectAddress.isRunning,
+            0, nil,
+            &size, &value)
+
+        return error == kAudioHardwareNoError ? value == 1 : false
+    }
+
     func toggleMicMute() {
         micMuted = !micMuted
     }
@@ -114,12 +133,14 @@ class Audio {
     private func registerDeviceStateListener() {
         guard let inputDevice = self.inputDevice else { return }
         AudioObjectAddPropertyListenerBlock(inputDevice, &AudioObjectAddress.muteState, DispatchQueue.main, self.deviceStateListener)
+        AudioObjectAddPropertyListenerBlock(inputDevice, &AudioObjectAddress.isRunning, DispatchQueue.main, self.deviceStateListener)
 
         listeners.forEach { $0.value() }
     }
 
     private func unregisterDeviceStateListener() {
         guard let inputDevice = self.inputDevice else { return }
+        AudioObjectRemovePropertyListenerBlock(inputDevice, &AudioObjectAddress.isRunning, DispatchQueue.main, self.deviceStateListener)
         AudioObjectRemovePropertyListenerBlock(inputDevice, &AudioObjectAddress.muteState, DispatchQueue.main, self.deviceStateListener)
     }