Merge pull request 'Lock exposure on start recording' (#4) from volodymyr/ios-lock-exposure into main

Reviewed-on: #4

package/ios/CameraView.swift

@@ -304,6 +304,15 @@ public final class CameraView: UIView, CameraSessionDelegate {
     onInitialized([:])
   }
   
+  func onCameraConfigurationChanged(_ configuration: CameraConfiguration?, _ difference: CameraConfiguration.Difference?) {
+    guard let configuration, let difference else { return }
+    
+    if difference.orientationChanged, let connection = previewView.videoPreviewLayer.connection {
+      let videoPreviewLayer = previewView.videoPreviewLayer
+      connection.setOrientation(configuration.orientation)
+    }
+  }
+
   func onCameraStarted() {
     ReactLogger.log(level: .info, message: "Camera started!")
     guard let onStarted = onStarted else {

package/ios/Core/CameraSession+Video.swift

@@ -18,6 +18,8 @@ extension CameraSession {
                       filePath: String,
                       onVideoRecorded: @escaping (_ video: Video) -> Void,
                       onError: @escaping (_ error: CameraError) -> Void) {
+    
+    lockCurrentExposure(for: captureSession)
     // Run on Camera Queue
     CameraQueues.cameraQueue.async {
       let start = DispatchTime.now()
@@ -191,4 +193,35 @@ extension CameraSession {
       }
     }
   }
+  
+  func lockCurrentExposure(for session: AVCaptureSession) {
+      guard let captureDevice = AVCaptureDevice.default(for: .video) else {
+          print("No capture device available")
+          return
+      }
+
+      do {
+          // Lock the device for configuration
+          try captureDevice.lockForConfiguration()
+
+          // Get the current exposure duration and ISO
+          let currentExposureDuration = captureDevice.exposureDuration
+          let currentISO = captureDevice.iso
+
+          // Check if the device supports custom exposure settings
+          if captureDevice.isExposureModeSupported(.custom) {
+              // Lock the current exposure and ISO by setting custom exposure mode
+              captureDevice.setExposureModeCustom(duration: currentExposureDuration, iso: currentISO, completionHandler: nil)
+              ReactLogger.log(level: .info, message: "Exposure and ISO locked at current values")
+          } else {
+              ReactLogger.log(level: .info, message:"Custom exposure mode not supported")
+          }
+
+          // Unlock the device after configuration
+          captureDevice.unlockForConfiguration()
+
+      } catch {
+        ReactLogger.log(level: .warning, message:"Error locking exposure: \(error)")
+      }
+  }
 }

package/ios/Core/CameraSession.swift

@@ -195,6 +195,7 @@ class CameraSession: NSObject, AVCaptureVideoDataOutputSampleBufferDelegate, AVC
           self.delegate?.onSessionInitialized()
         }
 
+        self.delegate?.onCameraConfigurationChanged(config, difference)
         // After configuring, set this to the new configuration.
         self.configuration = config
       } catch {

package/ios/Core/CameraSessionDelegate.swift

@@ -21,6 +21,8 @@ protocol CameraSessionDelegate: AnyObject {
    Called when the [CameraSession] successfully initializes
    */
   func onSessionInitialized()
+  
+  func onCameraConfigurationChanged(_ configuration: CameraConfiguration?, _ difference: CameraConfiguration.Difference?)
   /**
    Called when the [CameraSession] starts streaming frames. (isActive=true)
    */

package/ios/Extensions/AVCaptureOutput+mirror.swift

@@ -32,6 +32,15 @@ extension AVCaptureOutput {
   func setOrientation(_ orientation: Orientation) {
     // Set orientation for each connection
     for connection in connections {
+      connection.setOrientation(orientation)
+    }
+  }
+}
+
+
+
+extension AVCaptureConnection {
+  func setOrientation(_ orientation: Orientation) {
     #if swift(>=5.9)
       if #available(iOS 17.0, *) {
         // Camera Sensors are always in landscape rotation (90deg).
@@ -41,19 +50,18 @@ extension AVCaptureOutput {
 
         // TODO: Don't rotate the video output because it adds overhead. Instead just use EXIF flags for the .mp4 file if recording.
         //       Does that work when we flip the camera?
-          if connection.isVideoRotationAngleSupported(degrees) {
-            connection.videoRotationAngle = degrees
+        if isVideoRotationAngleSupported(degrees) {
+          videoRotationAngle = degrees
         }
       } else {
-          if connection.isVideoOrientationSupported {
-            connection.videoOrientation = orientation.toAVCaptureVideoOrientation()
+        if isVideoOrientationSupported {
+          videoOrientation = orientation.toAVCaptureVideoOrientation()
         }
       }
     #else
-        if connection.isVideoOrientationSupported {
-          connection.videoOrientation = orientation.toAVCaptureVideoOrientation()
+      if isVideoOrientationSupported {
+        videoOrientation = orientation.toAVCaptureVideoOrientation()
       }
     #endif
   }
 }
-}

package/ios/TestRecorder/ViewController.swift

@@ -113,5 +113,19 @@ class ViewController: UIViewController {
     }
   }
   
+  override func viewWillTransition(to size: CGSize, with coordinator: any UIViewControllerTransitionCoordinator) {
+    switch UIDevice.current.orientation {
+    case .landscapeLeft:
+      cameraView.orientation = "landscape-right"
+    case .landscapeRight:
+      cameraView.orientation = "landscape-left"
+    default:
+      cameraView.orientation = "portrait"
+    }
+    
+    cameraView.didSetProps([])
+    super.viewWillTransition(to: size, with: coordinator)
+  }
+  
 }