Recording from Built-In Mic when Playing through Bluetooth in iOS

Question

Is it possible to receive audio input from iPhone\'s built-in microphone, and play that audio through a Bluetooth headset, at the same time?

My goal is to always use

Answer 1

You can choose a specific microphone while playing audio through a bluetooth audio device.

  // set audio session category to .playAndRecord. use do-catch if you need error-handling
  try? AVAudioSession.sharedInstance().setCategory(.playAndRecord, mode: .default, options: [.defaultToSpeaker, .allowBluetoothA2DP, .allowBluetooth])

  // check if currentRoute is set to a bluetooth audio device
  let btOutputTypes: [AVAudioSession.Port] = [.bluetoothHFP, .bluetoothA2DP, .bluetoothLE]
  let btOutputs = AVAudioSession.sharedInstance().currentRoute.outputs.filter { btOutputTypes.contains($0.portType) }

  // if so, set preferred audio input to built-in mic
  if !btOutputs.isEmpty {
     let builtInMicInput = AVAudioSession.sharedInstance().availableInputs?.filter { $0.portType == .builtInMic }.first
     try? AVAudioSession.sharedInstance().setPreferredInput(builtInMicInput)
  } else {
     // set default input
     try? AVAudioSession.sharedInstance().setPreferredInput(nil)
  }

  try? AVAudioSession.sharedInstance().setActive(true)

or you can follow detailed instruction from here https://developer.apple.com/library/archive/qa/qa1799/_index.html

Answer 2

It is not possible to receive audio input from iPhone's built-in microphone, and play that audio through a Bluetooth headset, at the same time

1. There is a prevention that you can use like a walkie-talkie .
2. you have to create Two sessions . Means while recording audio you have to enable audio session with recordandplay.
3. while Playing you have to set the option to audiosession (allowingBluetooth) .
4. While Recording You have to set recordandplay.