feat: Add hardware-cost-too-high error for iOS 16

Author: mrousavy

package/ios/Core/CameraError.swift

@@ -148,6 +148,7 @@ enum SessionError {
   case cameraNotReady
   case audioSessionFailedToActivate
   case audioInUseByOtherApp
+  case hardwareCostTooHigh(cost: Float)
 
   var code: String {
     switch self {
@@ -157,6 +158,8 @@ enum SessionError {
       return "audio-in-use-by-other-app"
     case .audioSessionFailedToActivate:
       return "audio-session-failed-to-activate"
+    case .hardwareCostTooHigh:
+      return "hardware-cost-too-high"
     }
   }
 
@@ -168,6 +171,10 @@ enum SessionError {
       return "The audio session is already in use by another app with higher priority!"
     case .audioSessionFailedToActivate:
       return "Failed to activate Audio Session!"
+    case let .hardwareCostTooHigh(cost: cost):
+      return "The session's hardware-cost is too high! (Expected: <=1.0, Received: \(cost)) " +
+        "See https://developer.apple.com/documentation/avfoundation/avcapturesession/3950869-hardwarecost " +
+        "for more information."
     }
   }
 }

package/ios/Core/CameraSession.swift

@@ -235,6 +235,14 @@ class CameraSession: NSObject, AVCaptureVideoDataOutputSampleBufferDelegate, AVC
           }
         }
       }
+
+      // Check if Hardware Cost is okay
+      if #available(iOS 16.0, *) {
+        if self.captureSession.hardwareCost > 1 {
+          // Throw this error to the user, but don't abort the configuration. Maybe it still works.
+          self.onConfigureError(CameraError.session(.hardwareCostTooHigh(cost: self.captureSession.hardwareCost)))
+        }
+      }
     }
   }
 

package/src/CameraError.ts

@@ -28,6 +28,7 @@ export type SessionError =
   | 'session/audio-in-use-by-other-app'
   | 'session/no-outputs'
   | 'session/audio-session-failed-to-activate'
+  | 'session/hardware-cost-too-high'
   | 'session/invalid-output-configuration'
 export type CodeScannerError =
   | 'code-scanner/not-compatible-with-outputs'