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

Reviewed-on: #4

package/android/src/main/java/com/mrousavy/camera/CameraView.kt

@@ -72,6 +72,10 @@ class CameraView(context: Context) :
   var zoom: Float = 1f // in "factor"
   var exposure: Double = 1.0
   var orientation: Orientation = Orientation.PORTRAIT
+      set(value) {
+        field = value
+        previewView.orientation = value
+      }
   var enableZoomGesture = false
     set(value) {
       field = value

package/android/src/main/java/com/mrousavy/camera/CameraViewManager.kt

@@ -10,6 +10,7 @@ import com.mrousavy.camera.types.CodeScannerOptions
 import com.mrousavy.camera.types.Orientation
 import com.mrousavy.camera.types.PixelFormat
 import com.mrousavy.camera.types.ResizeMode
+import android.util.Log
 import com.mrousavy.camera.types.Torch
 import com.mrousavy.camera.types.VideoStabilizationMode
 
@@ -182,6 +183,7 @@ class CameraViewManager : ViewGroupManager<CameraView>() {
   fun setOrientation(view: CameraView, orientation: String?) {
     if (orientation != null) {
       val newMode = Orientation.fromUnionValue(orientation)
+      Log.i(TAG, "Orientation set to: $newMode")
       view.orientation = newMode
     } else {
       view.orientation = Orientation.PORTRAIT

package/android/src/main/java/com/mrousavy/camera/core/CameraSession.kt

@@ -312,7 +312,7 @@ class CameraSession(private val context: Context, private val cameraManager: Cam
         enableHdr
       )
       outputs.add(output)
-      // Size is usually landscape, so we flip it here
+
       previewView?.setSurfaceSize(size.width, size.height, deviceDetails.sensorOrientation)
     }
 

package/android/src/main/java/com/mrousavy/camera/core/PreviewView.kt

@@ -36,6 +36,13 @@ class PreviewView(context: Context, callback: SurfaceHolder.Callback) :
         updateLayout()
       }
     }
+  var orientation: Orientation = Orientation.PORTRAIT
+      set(value) {
+        if (field != value) {
+          Log.i(TAG, "View Orientation changed: $field -> $value")
+          field = value
+        }
+      }
   private var inputOrientation: Orientation = Orientation.LANDSCAPE_LEFT
     set(value) {
       if (field != value) {
@@ -101,6 +108,11 @@ class PreviewView(context: Context, callback: SurfaceHolder.Callback) :
   }
 
   private fun getSize(contentSize: Size, containerSize: Size, resizeMode: ResizeMode): Size {
+    var contentSize = contentSize
+    // Swap dimensions if orientation is landscape
+    if (orientation.isLandscape()) {
+      contentSize = Size(contentSize.height, contentSize.width)
+    }
     val contentAspectRatio = contentSize.width.toDouble() / contentSize.height
     val containerAspectRatio = containerSize.width.toDouble() / containerSize.height
     if (!(contentAspectRatio > 0 && containerAspectRatio > 0)) {
@@ -128,11 +140,11 @@ class PreviewView(context: Context, callback: SurfaceHolder.Callback) :
   override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
     super.onMeasure(widthMeasureSpec, heightMeasureSpec)
 
-    val viewSize = Size(MeasureSpec.getSize(widthMeasureSpec), MeasureSpec.getSize(heightMeasureSpec))
+    val measuredViewSize = Size(MeasureSpec.getSize(widthMeasureSpec), MeasureSpec.getSize(heightMeasureSpec))
     val surfaceSize = size.rotatedBy(inputOrientation)
-    val fittedSize = getSize(surfaceSize, viewSize, resizeMode)
+    val fittedSize = getSize(surfaceSize, measuredViewSize, resizeMode)
 
-    Log.i(TAG, "PreviewView is $viewSize, rendering $surfaceSize content ($inputOrientation). Resizing to: $fittedSize ($resizeMode)")
+    Log.i(TAG, "PreviewView is $measuredViewSize rendering $surfaceSize orientation ($orientation). Resizing to: $fittedSize ($resizeMode)")
     setMeasuredDimension(fittedSize.width, fittedSize.height)
   }
 

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)")
+      }
+  }
 }