Avcapturesession and Background Audio iOS 7

AVCaptureSession and background audio iOS 7

You can use the AVAudioSessionCategoryOptionMixWithOthers.
For instance,

AVAudioSession *session = [AVAudioSession sharedInstance];
[session setCategory:AVAudioSessionCategoryPlayAndRecord withOptions:AVAudioSessionCategoryOptionMixWithOthers error:nil];

After that, you can use the AVAudioPlayer simultaneously with AVCaptureSession.

However, the above code leads to very low volume.
If you want normal volume, use the AVAudioSessionCategoryOptionDefaultToSpeaker with AVAudioSessionCategoryOptionMixWithOthers as follows,

[session setCategory:AVAudioSessionCategoryPlayAndRecord  withOptions:AVAudioSessionCategoryOptionMixWithOthers|AVAudioSessionCategoryOptionDefaultToSpeaker error:nil];

This goes well.

AVCaptureSession with only background music

You'll have to remove the AVCaptureInput device that represents the microphone.
You can do this by iterating over the AVCaptureSession instance and doing something like this:

AVCaptureSession *currentSession = self.currentSession;
for(AVCaptureInput *input in currentSession.inputs) {

    for (AVCaptureInputPort *port in input.ports) {
        if ([[port mediaType] isEqual:AVMediaTypeAudio]) {
            [currentSession removeInput:input];
            break;
        }
    }
}

now setup your audio as something like this:

AVAudioSession *session = [AVAudioSession sharedInstance];
[session setCategory:AVAudioSessionCategoryPlayAndRecord  withOptions:AVAudioSessionCategoryOptionMixWithOthers|AVAudioSessionCategoryOptionDefaultToSpeaker error:nil];
NSError *activationError = nil;
BOOL success = [session setActive: YES error: &activationError];

SWIFT 3

let currentSession = self.currentSession

for input in currentSession.inputs as! [AVCaptureInput] {
  for port in input.ports as! [AVCaptureInputPort] {
    if port.mediaType == AVMediaTypeAudio {
      currentSession.removeInput(input)
      break
    }
  }
}

do {
  let session = AVAudioSession.sharedInstance()
  try session.setCategory(AVAudioSessionCategoryPlayAndRecord, with: [AVAudioSessionCategoryOptions.mixWithOthers, AVAudioSessionCategoryOptions.defaultToSpeaker])
  try session.setActive(true)
} catch {

}

AVCaptureSession, AVCaptureAudioDataOutput and background Music

    do {
      try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayAndRecord, withOptions: [AVAudioSessionCategoryOptions.MixWithOthers, AVAudioSessionCategoryOptions.DefaultToSpeaker])
      try AVAudioSession.sharedInstance().setActive(true)

    } catch {
      print("error")
    }

    captureSession = AVCaptureSession()

iOS Camera: `AVCaptureAudioDataOutput` activate audio session on the fly, avoid background music stutter

Finally figured it out. I simply created a separate AVCaptureSession specifically for the audio input/output which I synchronize with the main capture session's masterClock. I can then start/stop the secondary capture session on the fly (shortly before start recording)

AVCaptureSession addInput causing glitch in background audio

Apparently there is no workaround.
https://forums.developer.apple.com/message/74778#74778

Background music cancelled when capturing audio in AVCaptureSession

Have you tried explicitly creating an instance of the session object and setting MixWithOthers, as described here? I'm thinking the Xamarin equivalent would be something like

AVAudioSession session = AVAudioSession.SharedInstance();
session.SetCategory(AVAudioSessionCategory.PlayAndRecord, AVAudioSessionCategoryOptions.MixWithOthers | AVAudioSessionCategoryOptions.DefaultToSpeaker);

Alternatively, as suggested in the link above, try setting the following in your AppDelegate:

AudioSession.Category = AudioSessionCategory.PlayAndRecord;
AudioSession.AudioShouldDuck = true;
AudioSession.OverrideCategoryDefaultToSpeaker = true;

...and then creating your AVCaptureSession like this:

AVCaptureSession session2 = new AVCaptureSession();
session2.AutomaticallyConfiguresApplicationAudioSession = false;

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