Merge pull request #42 from jpsim/fix-tuner-becoming-frozen-when-resuming-from-background

Fix tuner becoming frozen when resuming from background

Author: jpsim

CHANGELOG.md

@@ -1,3 +1,8 @@
+## 0.2.2
+
+* Fixed an issue where the tuner would become unresponsive after
+  switching to other apps.
+
 ## 0.2.1
 
 * The app no longer dims the display after a period of inactivity on

Packages/MicrophonePitchDetector/Sources/MicrophonePitchDetector/AudioEngine.swift

@@ -59,6 +59,7 @@ extension AVAudioMixerNode {
 final class AudioEngine {
     /// Internal AVAudioEngine
     private let avEngine = AVAudioEngine()
+    private let session = AVAudioSession.sharedInstance()
 
     /// Main mixer at the end of the signal chain
     private var mainMixerNode: Mixer?
@@ -91,11 +92,14 @@ final class AudioEngine {
     /// Start the engine
     func start() throws {
         try avEngine.start()
+        try session.setCategory(.playAndRecord, options: [.defaultToSpeaker, .mixWithOthers])
+        try session.setActive(true)
     }
 
     /// Stop the engine
-    func stop() {
+    func stop() throws {
         avEngine.stop()
+        try session.setActive(false)
     }
 
     // MARK: - Private

Packages/MicrophonePitchDetector/Sources/MicrophonePitchDetector/MicrophonePitchDetector.swift

@@ -28,7 +28,11 @@ public final class MicrophonePitchDetector: ObservableObject {
 
     public func stop() {
         guard hasMicrophoneAccess else { return }
-        engine.stop()
+        do {
+            try engine.stop()
+        } catch {
+            // TODO: Handle error
+        }
     }
 
     // MARK: - Private