Manually setup AVAudioSession (allow background music playback)

ios/CameraError.swift

@@ -133,17 +133,25 @@ enum FormatError {
   }
 }
 
-enum SessionError: String {
-  case cameraNotReady = "camera-not-ready"
+enum SessionError {
+  case cameraNotReady
+  case audioSessionSetupFailed(reason: String)
 
   var code: String {
-    return rawValue
+    switch self {
+    case .cameraNotReady:
+      return "camera-not-ready"
+    case .audioSessionSetupFailed:
+      return "audio-session-setup-failed"
+    }
   }
 
   var message: String {
     switch self {
     case .cameraNotReady:
       return "The Camera is not ready yet! Wait for the onInitialized() callback!"
+    case let .audioSessionSetupFailed(reason):
+      return "The audio session failed to setup! \(reason)"
     }
   }
 }

ios/CameraView.swift

@@ -228,6 +228,16 @@ final class CameraView: UIView {
     }
 
     // INPUTS
+    // Audio Setup
+    do {
+      captureSession.automaticallyConfiguresApplicationAudioSession = false
+      try AVAudioSession.sharedInstance().setCategory(AVAudioSession.Category.playAndRecord, options: [.mixWithOthers, .allowBluetooth, .defaultToSpeaker])
+      try AVAudioSession.sharedInstance().setActive(true)
+    } catch let error as NSError {
+      // not critical, so don't return
+      invokeOnError(.session(.audioSessionSetupFailed(reason: error.description)))
+    }
+
     // Video Input
     do {
       if let videoDeviceInput = self.videoDeviceInput {

src/CameraError.ts

@@ -20,7 +20,7 @@ export type FormatError =
   | 'format/invalid-low-light-boost'
   | 'format/invalid-format'
   | 'format/invalid-preset';
-export type SessionError = 'session/camera-not-ready';
+export type SessionError = 'session/camera-not-ready' | 'session/audio-session-setup-failed';
 export type CaptureError =
   | 'capture/invalid-photo-format'
   | 'capture/encoder-error'