ios12-airpods-routing-bugreport

Test app for displaying/verifying issue with AirPods not allowing routing overrides

Summary:

System will force the route back to AirPods if the application attempts use overrideOutputAudioPort(_:)

Sample app can be found here

Steps to Reproduce:

1. Pair AirPods to device, and place in ears so device registers AirPods as connected.

• Audio route will automatically switch to AirPods

2. Open Application
3. Setup AVAudioSession according to the configuration below
4. Configure a NotificationCenter observer to listen and report changes on AVAudioSession.routeChangeNotification
5. Activate the audio session by passing true to setActive(_:)
6. Pass AVAudioSession.PortOverride.speaker to overrideOutputAudioPort(_:) in order to initiate an audio route override
7. Observer the changes fired from your route change listener from step 4

Expected Results:

App audio should be routed to the speakers instead of the AirPods.

Actual Results:

AVAudioSessionRouteChangeNotification will report route changed due to AVAudioSessionRouteChangeReasonOverride, but then immediate after will switch back to AirPods with the reason AVAudioSessionRouteChangeReasonNewDeviceAvailable.

NOTE: At no point were the AirPods moved or removed.

Version/Build:

• Able to reproduce building with Xcode 10.0 (10A255) using an iPhone 8+ running iOS 12.0.1 (16A404).
• Working as expected building with Xcode 10.0 (10A255) using an iPhone 7 running iOS 11.4.1 (15G77)

Configuration:

• AVAudioSession category: AVAudioSessionCategoryPlayAndRecord
• AVAudioSession mode: AVAudioSessionModeVoiceChat
• AVAudioSession category options mode: AVAudioSessionCategoryOptionAllowBluetooth