How to capture and preview microphone audio during a multi-route audiosession.

For TLDR; Jump straight to Solution.

My audio sidekick.

Problem

For you that do not know me — I constantly have headphones connected to my device. I never thought this would be a problem until I saw that my app would freeze when replaying video — often illustrating this:

Unknown selected data source for Port delasounds (type: BluetoothA2DPOutput)

Theory

If it can capture some audio and freeze and other — then perhaps it is :

• That you need to allow it to work in tandem with the speaker (tried and only led to more problems).

OR

• That you have deactivated the ability for the app to play audio too early — jamming the video (this one is the case)

Solution

A : Setup your Audio Session as follows

do {
   try self.recordingSession.setCategory(AVAudioSession.Category.playAndRecord, mode: .videoRecording, options: [.defaultToSpeaker])
   try self.recordingSession.setActive(true, options: .notifyOthersOnDeactivation)
}
catch {
// CATCH THE ERROR
}

B : End the capturing of audio when you want your recording to stop.

func endAudioCapture() {
    self.captureSession!.stopRunning();
}

C: Turn the audio session “off” when you’re done playing the replay.

public func endAudioSession() {
    do {
    try self.recordingSession.setActive(false, options: .notifyOthersOnDeactivation)
    }
    catch {
    print("ERROR CANCELLING RECORDING SESSION : \(error)")
    }
}

O