Broken in iOS 15 beta 6 as well!

Still not fixed in iOS 15 beta 6!

Broken in iOS 15 beta 5 as well!

Still not fixed in iOS 15 beta 5. Looks like iOS 15 main release is going to have broken stereo audio API

The issue is seen in iOS 15 beta 4 as well. Stereo Audio Capture sample code is completely broken.

Still seen on iOS 15 beta 4. Stereo Audio Capture sample code is broken!

Even the Stereo Audio Capture sample code by Apple fails on iOS 15 beta 3. https://developer.apple.com/documentation/avfaudio/avaudiosession/capturing_stereo_audio_from_built-in_microphones

Dear Core Audio/AVFoundation engineers, Any update on this bug? Is this a known issue for you guys? If not, is this expected to be fixed in upcoming iOS 15 betas?

It does not work anymore on iOS 15 beta, all Audio samples delivered by RemoteIO are silent when stereo orientation is configured in AVAudioSession. I have filed a bug FB9393169 along with reproducible sample code.

On further investigation, I see the problem happens only when stereo format is configured on the microphone as follows. The code works perfectly on iOS 14 devices, only on iOS 15 devices it causes RemoteIO unit to emit silent audio frames. Is there any known workaround for the same? I have filed a bug FB9393169 along with reproducible sample code.  public func selectStereoFormatForBuiltinMic(_ orientation:AVAudioSession.Orientation) -> Bool {         var configuredStereo = false         if #available(iOS 14.0, *) {             let session = AVAudioSession.sharedInstance()             guard let preferredInput = session.preferredInput,             let dataSources = preferredInput.dataSources,             let newDataSource = dataSources.first(where: { $0.orientation == orientation }),             let supportedPolarPatterns = newDataSource.supportedPolarPatterns else {                     return false             }             do {                 supportsStereo = supportedPolarPatterns.contains(.stereo)                 // If the data source supports stereo, set it as the preferred polar pattern.                 if supportsStereo {                     // Set the preferred polar pattern to stereo.                     try newDataSource.setPreferredPolarPattern(.stereo)                     configuredStereo = true                 }                 // Set the preferred data source and polar pattern.                 try preferredInput.setPreferredDataSource(newDataSource)                 // Update the input orientation to match the current user interface orientation.                 try session.setPreferredInputOrientation(stereoOrientation)             } catch {                 NSLog("Unable to select stereo \(error)")                 configuredStereo = false             }         }         return configuredStereo     }