fix: Fix blackscreen issues and lifecycle when closing Camera (#2339)

* fix: Fix Blackscreen by deterministically destroying session if `isActive=false`

* Re-open Camera if session died

* Simplify Camera

* Disconnect is optional, block when resetting state

* fix: Log in `configure { ... }`

* fix: Make concurrent configure safe

* fix: Don't resize preview

* fix: Use current `CameraConfiguration`

* Don't start if no outputs are available

* Only mount with preview outputs

* Update CameraSession.kt

* Update PreviewView.kt

* Better logging

* Update CameraSession.kt

* Extract

* fix: Rebuild entire session if `isActive` changed

* isActive safe

* Start session at 1

* Create ActiveCameraDevice.kt

* interrupts

* chore: Freeze `frame` in `useFrameProcessor`

* Revert "chore: Freeze `frame` in `useFrameProcessor`"

This reverts commit dff93d506e29a791d8dea8842b880ab5c892211e.

* chore: Better logging

* fix: Move HDR to `video`/`photo` config

* fix: Fix hdr usage

* fix: Ignore any updates after destroying Camera

* fix: Fix video HDR

* chore: Format code

* fix: Check Camera permission

* Remove unneeded error

* Update CameraSession.kt

* Update CameraPage.tsx

* Delete OutputConfiguration.toDebugString.kt

* Update CameraSession.kt

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

@@ -30,7 +30,7 @@ class CameraDevicesManager(private val reactContext: ReactApplicationContext) :
       }
 
     override fun onCameraAvailable(cameraId: String) {
-      Log.i(TAG, "Camera #$cameraId: Available!")
+      Log.i(TAG, "Camera #$cameraId is now available.")
       if (!devices.contains(cameraId)) {
         devices.add(cameraId)
         sendAvailableDevicesChangedEvent()
@@ -38,7 +38,7 @@ class CameraDevicesManager(private val reactContext: ReactApplicationContext) :
     }
 
     override fun onCameraUnavailable(cameraId: String) {
-      Log.i(TAG, "Camera #$cameraId: Unavailable!")
+      Log.i(TAG, "Camera #$cameraId is now unavailable.")
       if (devices.contains(cameraId) && !isDeviceConnected(cameraId)) {
         devices.remove(cameraId)
         sendAvailableDevicesChangedEvent()

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

@@ -47,14 +47,6 @@ class CameraView(context: Context) :
   // react properties
   // props that require reconfiguring
   var cameraId: String? = null
-    set(value) {
-      if (value != null) {
-        // TODO: Move this into CameraSession
-        val f = if (format != null) CameraDeviceFormat.fromJSValue(format!!) else null
-        previewView.resizeToInputCamera(value, cameraManager, f)
-      }
-      field = value
-    }
   var enableDepthData = false
   var enableHighQualityPhotos: Boolean? = null
   var enablePortraitEffectsMatteDelivery = false
@@ -101,6 +93,7 @@ class CameraView(context: Context) :
   // session
   internal val cameraSession: CameraSession
   private val previewView: PreviewView
+  private var currentConfigureCall: Long = System.currentTimeMillis()
 
   internal var frameProcessor: FrameProcessor? = null
     set(value) {
@@ -138,15 +131,24 @@ class CameraView(context: Context) :
 
   fun update() {
     Log.i(TAG, "Updating CameraSession...")
+    val now = System.currentTimeMillis()
+    currentConfigureCall = now
 
     launch {
       cameraSession.configure { config ->
+        if (currentConfigureCall != now) {
+          // configure waits for a lock, and if a new call to update() happens in the meantime we can drop this one.
+          // this works similar to how React implemented concurrent rendering, the newer call to update() has higher priority.
+          Log.i(TAG, "A new configure { ... } call arrived, aborting this one...")
+          return@configure
+        }
+
         // Input Camera Device
         config.cameraId = cameraId
 
         // Photo
         if (photo == true) {
-          config.photo = CameraConfiguration.Output.Enabled.create(CameraConfiguration.Photo(Unit))
+          config.photo = CameraConfiguration.Output.Enabled.create(CameraConfiguration.Photo(photoHdr))
         } else {
           config.photo = CameraConfiguration.Output.Disabled.create()
         }
@@ -155,6 +157,7 @@ class CameraView(context: Context) :
         if (video == true || enableFrameProcessor) {
           config.video = CameraConfiguration.Output.Enabled.create(
             CameraConfiguration.Video(
+              videoHdr,
               pixelFormat,
               enableFrameProcessor
             )
@@ -183,10 +186,6 @@ class CameraView(context: Context) :
         // Orientation
         config.orientation = orientation
 
-        // HDR
-        config.videoHdr = videoHdr
-        config.photoHdr = photoHdr
-
         // Format
         val format = format
         if (format != null) {

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

@@ -18,10 +18,6 @@ data class CameraConfiguration(
   var video: Output<Video> = Output.Disabled.create(),
   var codeScanner: Output<CodeScanner> = Output.Disabled.create(),
 
-  // HDR
-  var videoHdr: Boolean = false,
-  var photoHdr: Boolean = false,
-
   // Orientation
   var orientation: Orientation = Orientation.PORTRAIT,
 
@@ -47,8 +43,8 @@ data class CameraConfiguration(
 
   // Output<T> types, those need to be comparable
   data class CodeScanner(val codeTypes: List<CodeType>)
-  data class Photo(val nothing: Unit)
+  data class Photo(val enableHdr: Boolean)
-  data class Video(val pixelFormat: PixelFormat, val enableFrameProcessor: Boolean)
+  data class Video(val enableHdr: Boolean, val pixelFormat: PixelFormat, val enableFrameProcessor: Boolean)
   data class Audio(val nothing: Unit)
   data class Preview(val surface: Surface)
 
@@ -71,7 +67,7 @@ data class CameraConfiguration(
   }
 
   data class Difference(
-    // Input Camera (cameraId and isActive)
+    // Input Camera (cameraId, isActive)
     val deviceChanged: Boolean,
     // Outputs & Session (Photo, Video, CodeScanner, HDR, Format)
     val outputsChanged: Boolean,
@@ -79,36 +75,30 @@ data class CameraConfiguration(
     val sidePropsChanged: Boolean,
     // (isActive) changed
     val isActiveChanged: Boolean
-  ) {
+  )
-    val hasAnyDifference: Boolean
-      get() = sidePropsChanged || outputsChanged || deviceChanged
-  }
 
   companion object {
     fun copyOf(other: CameraConfiguration?): CameraConfiguration = other?.copy() ?: CameraConfiguration()
 
     fun difference(left: CameraConfiguration?, right: CameraConfiguration): Difference {
-      val deviceChanged = left?.cameraId != right.cameraId
+      // input device
+      val deviceChanged = left?.cameraId != right.cameraId || left?.isActive != right.isActive
 
+      // outputs
       val outputsChanged = deviceChanged ||
-        // input device
         left?.photo != right.photo ||
         left.video != right.video ||
         left.codeScanner != right.codeScanner ||
         left.preview != right.preview ||
-        // outputs
+        left.format != right.format
-        left.videoHdr != right.videoHdr ||
-        left.photoHdr != right.photoHdr ||
-        left.format != right.format // props that affect the outputs
 
+      // repeating request
       val sidePropsChanged = outputsChanged ||
-        // depend on outputs
         left?.torch != right.torch ||
         left.enableLowLightBoost != right.enableLowLightBoost ||
         left.fps != right.fps ||
         left.zoom != right.zoom ||
         left.videoStabilizationMode != right.videoStabilizationMode ||
-        left.isActive != right.isActive ||
         left.exposure != right.exposure
 
       val isActiveChanged = left?.isActive != right.isActive

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

@@ -55,7 +55,7 @@ class CameraNotReadyError :
 class CameraCannotBeOpenedError(cameraId: String, error: CameraDeviceError) :
   CameraError("session", "camera-cannot-be-opened", "The given Camera device (id: $cameraId) could not be opened! Error: $error")
 class CameraSessionCannotBeConfiguredError(cameraId: String) :
-  CameraError("session", "cannot-create-session", "Failed to create a Camera Session for Camera $cameraId!")
+  CameraError("session", "cannot-create-session", "Failed to create a Camera Session for Camera #$cameraId!")
 class CameraDisconnectedError(cameraId: String, error: CameraDeviceError) :
   CameraError("session", "camera-has-been-disconnected", "The given Camera device (id: $cameraId) has been disconnected! Error: $error")
 
@@ -87,8 +87,6 @@ class CodeTypeNotSupportedError(codeType: String) :
 
 class ViewNotFoundError(viewId: Int) :
   CameraError("system", "view-not-found", "The given view (ID $viewId) was not found in the view manager.")
-class FrameProcessorsUnavailableError(reason: String) :
-  CameraError("system", "frame-processors-unavailable", "Frame Processors are unavailable! Reason: $reason")
 class HardwareBuffersNotAvailableError :
   CameraError("system", "hardware-buffers-unavailable", "HardwareBuffers are only available on API 28 or higher!")
 

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

@@ -1,6 +1,8 @@
 package com.mrousavy.camera.core
 
+import android.Manifest
 import android.content.Context
+import android.content.pm.PackageManager
 import android.graphics.ImageFormat
 import android.graphics.Point
 import android.hardware.camera2.CameraCaptureSession
@@ -12,7 +14,6 @@ import android.hardware.camera2.CaptureRequest
 import android.hardware.camera2.CaptureResult
 import android.hardware.camera2.TotalCaptureResult
 import android.hardware.camera2.params.MeteringRectangle
-import android.hardware.camera2.params.OutputConfiguration
 import android.media.Image
 import android.media.ImageReader
 import android.os.Build
@@ -21,6 +22,7 @@ import android.util.Range
 import android.util.Size
 import android.view.Surface
 import android.view.SurfaceHolder
+import androidx.core.content.ContextCompat
 import com.google.mlkit.vision.barcode.common.Barcode
 import com.mrousavy.camera.core.outputs.BarcodeScannerOutput
 import com.mrousavy.camera.core.outputs.PhotoOutput
@@ -44,6 +46,7 @@ import com.mrousavy.camera.types.QualityPrioritization
 import com.mrousavy.camera.types.RecordVideoOptions
 import com.mrousavy.camera.types.Torch
 import com.mrousavy.camera.types.VideoStabilizationMode
+import com.mrousavy.camera.utils.ImageFormatUtils
 import java.io.Closeable
 import java.util.concurrent.CancellationException
 import kotlin.coroutines.CoroutineContext
@@ -54,18 +57,15 @@ import kotlinx.coroutines.sync.Mutex
 import kotlinx.coroutines.sync.withLock
 
 class CameraSession(private val context: Context, private val cameraManager: CameraManager, private val callback: CameraSessionCallback) :
+  CameraManager.AvailabilityCallback(),
   Closeable,
   CoroutineScope {
   companion object {
     private const val TAG = "CameraSession"
-
-    // TODO: Samsung advertises 60 FPS but only allows 30 FPS for some reason.
-    private val CAN_DO_60_FPS = !Build.MANUFACTURER.equals("samsung", true)
   }
 
   // Camera Configuration
   private var configuration: CameraConfiguration? = null
-  private var currentConfigureCall: Long = System.currentTimeMillis()
 
   // Camera State
   private var captureSession: CameraCaptureSession? = null
@@ -73,12 +73,22 @@ class CameraSession(private val context: Context, private val cameraManager: Cam
   private var previewRequest: CaptureRequest.Builder? = null
   private var photoOutput: PhotoOutput? = null
   private var videoOutput: VideoPipelineOutput? = null
-  private var previewOutput: SurfaceOutput? = null
   private var codeScannerOutput: BarcodeScannerOutput? = null
   private var previewView: PreviewView? = null
   private val photoOutputSynchronizer = PhotoOutputSynchronizer()
   private val mutex = Mutex()
+  private var isDestroyed = false
   private var isRunning = false
+    set(value) {
+      if (field != value) {
+        if (value) {
+          callback.onStarted()
+        } else {
+          callback.onStopped()
+        }
+      }
+      field = value
+    }
 
   override val coroutineContext: CoroutineContext
     get() = CameraQueues.cameraQueue.coroutineDispatcher
@@ -95,15 +105,6 @@ class CameraSession(private val context: Context, private val cameraManager: Cam
       updateVideoOutputs()
     }
 
-  override fun close() {
-    runBlocking {
-      mutex.withLock {
-        destroy()
-        photoOutputSynchronizer.clear()
-      }
-    }
-  }
-
   val orientation: Orientation
     get() {
       val cameraId = configuration?.cameraId ?: return Orientation.PORTRAIT
@@ -112,41 +113,67 @@ class CameraSession(private val context: Context, private val cameraManager: Cam
       return Orientation.fromRotationDegrees(sensorRotation)
     }
 
-  suspend fun configure(lambda: (configuration: CameraConfiguration) -> Unit) {
+  init {
-    // This is the latest call to configure()
+    cameraManager.registerAvailabilityCallback(this, CameraQueues.cameraQueue.handler)
-    val now = System.currentTimeMillis()
+  }
-    currentConfigureCall = now
 
-    Log.i(TAG, "Updating CameraSession Configuration...")
+  override fun close() {
-
+    Log.i(TAG, "Closing CameraSession...")
-    // Let caller configure a new configuration for the Camera.
+    isDestroyed = true
-    val config = CameraConfiguration.copyOf(this.configuration)
+    cameraManager.unregisterAvailabilityCallback(this)
-    lambda(config)
+    runBlocking {
-    val diff = CameraConfiguration.difference(this.configuration, config)
+      mutex.withLock {
-
+        destroy()
-    if (!diff.hasAnyDifference) {
+        photoOutputSynchronizer.clear()
-      Log.w(TAG, "Called configure(...) but nothing changed...")
+      }
-      return
     }
+    Log.i(TAG, "CameraSession closed!")
+  }
+
+  override fun onCameraAvailable(cameraId: String) {
+    super.onCameraAvailable(cameraId)
+    if (this.configuration?.cameraId == cameraId && cameraDevice == null && configuration?.isActive == true) {
+      Log.i(TAG, "Camera #$cameraId is now available again, trying to re-open it now...")
+      launch {
+        configure {
+          // re-open CameraDevice if needed
+        }
+      }
+    }
+  }
+
+  suspend fun configure(lambda: (configuration: CameraConfiguration) -> Unit) {
+    Log.i(TAG, "configure { ... }: Waiting for lock...")
 
     mutex.withLock {
-      // Cancel configuration if there has already been a new config
+      // Let caller configure a new configuration for the Camera.
-      if (currentConfigureCall != now) {
+      val config = CameraConfiguration.copyOf(this.configuration)
-        // configure() has been called again just now, skip this one so the new call takes over.
+      lambda(config)
-        return
+      val diff = CameraConfiguration.difference(this.configuration, config)
+
+      if (isDestroyed) {
+        Log.i(TAG, "CameraSession is already destroyed. Skipping configure { ... }")
+        return@withLock
       }
 
+      Log.i(TAG, "configure { ... }: Updating CameraSession Configuration... $diff")
+
       try {
+        val needsRebuild = config.isActive && (cameraDevice == null || captureSession == null)
+        if (needsRebuild) {
+          Log.i(TAG, "Need to rebuild CameraDevice and CameraCaptureSession...")
+        }
+
         // Build up session or update any props
-        if (diff.deviceChanged) {
+        if (diff.deviceChanged || needsRebuild) {
           // 1. cameraId changed, open device
           configureCameraDevice(config)
         }
-        if (diff.outputsChanged) {
+        if (diff.outputsChanged || needsRebuild) {
           // 2. outputs changed, build new session
           configureOutputs(config)
         }
-        if (diff.sidePropsChanged) {
+        if (diff.sidePropsChanged || needsRebuild) {
           // 3. zoom etc changed, update repeating request
           configureCaptureRequest(config)
         }
@@ -155,21 +182,11 @@ class CameraSession(private val context: Context, private val cameraManager: Cam
         this.configuration = config
 
         // Notify about Camera initialization
-        if (diff.deviceChanged) {
+        if (diff.deviceChanged && config.isActive) {
           callback.onInitialized()
         }
-
-        // Notify about Camera start/stop
-        if (diff.isActiveChanged) {
-          // TODO: Move that into the CaptureRequest callback to get actual first-frame arrive time?
-          if (config.isActive) {
-            callback.onStarted()
-          } else {
-            callback.onStopped()
-          }
-        }
       } catch (error: Throwable) {
-        Log.e(TAG, "Failed to configure CameraSession! Error: ${error.message}, Config-Diff: $diff", error)
+        Log.e(TAG, "Failed to configure CameraSession! Error: ${error.message}, isRunning: $isRunning, Config-Diff: $diff", error)
         callback.onError(error)
       }
     }
@@ -177,15 +194,9 @@ class CameraSession(private val context: Context, private val cameraManager: Cam
 
   private fun destroy() {
     Log.i(TAG, "Destroying session..")
-    captureSession?.stopRepeating()
-    captureSession?.close()
-    captureSession = null
-
     cameraDevice?.close()
     cameraDevice = null
 
-    previewOutput?.close()
-    previewOutput = null
     photoOutput?.close()
     photoOutput = null
     videoOutput?.close()
@@ -193,7 +204,6 @@ class CameraSession(private val context: Context, private val cameraManager: Cam
     codeScannerOutput?.close()
     codeScannerOutput = null
 
-    configuration = null
     isRunning = false
   }
 
@@ -236,31 +246,53 @@ class CameraSession(private val context: Context, private val cameraManager: Cam
         config.preview = CameraConfiguration.Output.Disabled.create()
       }
     }
+    Log.i(TAG, "Preview Output destroyed!")
   }
 
   /**
    * Set up the `CameraDevice` (`cameraId`)
    */
   private suspend fun configureCameraDevice(configuration: CameraConfiguration) {
+    if (!configuration.isActive) {
+      // If isActive=false, we don't care if the device is opened or closed.
+      // Android OS can close the CameraDevice if it needs it, otherwise we keep it warm.
+      Log.i(TAG, "isActive is false, skipping CameraDevice configuration.")
+      return
+    }
+
+    if (cameraDevice != null) {
+      // Close existing device
+      Log.i(TAG, "Closing previous Camera #${cameraDevice?.id}...")
+      cameraDevice?.close()
+      cameraDevice = null
+    }
+    isRunning = false
+
+    // Check Camera Permission
+    val cameraPermission = ContextCompat.checkSelfPermission(context, Manifest.permission.CAMERA)
+    if (cameraPermission != PackageManager.PERMISSION_GRANTED) throw CameraPermissionError()
+
+    // Open new device
     val cameraId = configuration.cameraId ?: throw NoCameraDeviceError()
-
     Log.i(TAG, "Configuring Camera #$cameraId...")
-
-    cameraDevice?.close()
     cameraDevice = cameraManager.openCamera(cameraId, { device, error ->
-      if (this.cameraDevice == device) {
+      if (cameraDevice != device) {
-        Log.e(TAG, "Camera Device $device has been disconnected!", error)
-        isRunning = false
-        callback.onError(error)
-      } else {
         // a previous device has been disconnected, but we already have a new one.
         // this is just normal behavior
+        return@openCamera
+      }
+
+      this.cameraDevice = null
+      isRunning = false
+
+      if (error != null) {
+        Log.e(TAG, "Camera #${device.id} has been unexpectedly disconnected!", error)
+        callback.onError(error)
+      } else {
+        Log.i(TAG, "Camera #${device.id} has been gracefully disconnected!")
       }
     }, CameraQueues.cameraQueue)
 
-    // Update PreviewView's Surface Size to a supported value from this Capture Device
-    previewView?.resizeToInputCamera(cameraId, cameraManager, configuration.format)
-
     Log.i(TAG, "Successfully configured Camera #$cameraId!")
   }
 
@@ -268,29 +300,34 @@ class CameraSession(private val context: Context, private val cameraManager: Cam
    * Set up the `CaptureSession` with all outputs (preview, photo, video, codeScanner) and their HDR/Format settings.
    */
   private suspend fun configureOutputs(configuration: CameraConfiguration) {
-    val cameraDevice = cameraDevice ?: throw NoCameraDeviceError()
+    if (!configuration.isActive) {
-    val characteristics = cameraManager.getCameraCharacteristics(cameraDevice.id)
+      Log.i(TAG, "isActive is false, skipping CameraCaptureSession configuration.")
-    val format = configuration.format
+      return
+    }
+    val cameraDevice = cameraDevice
+    if (cameraDevice == null) {
+      Log.i(TAG, "CameraSession hasn't configured a CameraDevice, skipping session configuration...")
+      return
+    }
 
-    Log.i(TAG, "Configuring Session for Camera #${cameraDevice.id}...")
-
-    // TODO: Do we want to skip this is this.cameraSession already contains all outputs?
-    // Destroy previous CaptureSession
-    captureSession?.close()
-    captureSession = null
     // Destroy previous outputs
+    Log.i(TAG, "Destroying previous outputs...")
     photoOutput?.close()
     photoOutput = null
     videoOutput?.close()
     videoOutput = null
-    previewOutput?.close()
-    previewOutput = null
     codeScannerOutput?.close()
     codeScannerOutput = null
+    isRunning = false
+
+    val characteristics = cameraManager.getCameraCharacteristics(cameraDevice.id)
+    val format = configuration.format
+
+    Log.i(TAG, "Creating outputs for Camera #${cameraDevice.id}...")
 
     val isSelfie = characteristics.get(CameraCharacteristics.LENS_FACING) == CameraCharacteristics.LENS_FACING_FRONT
 
-    val outputs = mutableListOf<OutputConfiguration>()
+    val outputs = mutableListOf<SurfaceOutput>()
 
     // Photo Output
     val photo = configuration.photo as? CameraConfiguration.Output.Enabled<CameraConfiguration.Photo>
@@ -300,15 +337,15 @@ class CameraSession(private val context: Context, private val cameraManager: Cam
       val size = sizes.closestToOrMax(format?.photoSize)
       val maxImages = 10
 
-      Log.i(TAG, "Adding ${size.width} x ${size.height} Photo Output in Format #$imageFormat...")
+      Log.i(TAG, "Adding ${size.width}x${size.height} Photo Output in ${ImageFormatUtils.imageFormatToString(imageFormat)}...")
       val imageReader = ImageReader.newInstance(size.width, size.height, imageFormat, maxImages)
       imageReader.setOnImageAvailableListener({ reader ->
         Log.i(TAG, "Photo Captured!")
         val image = reader.acquireLatestImage()
         onPhotoCaptured(image)
       }, CameraQueues.cameraQueue.handler)
-      val output = PhotoOutput(imageReader, configuration.photoHdr)
+      val output = PhotoOutput(imageReader, photo.config.enableHdr)
-      outputs.add(output.toOutputConfiguration(characteristics))
+      outputs.add(output)
       photoOutput = output
     }
 
@@ -319,7 +356,7 @@ class CameraSession(private val context: Context, private val cameraManager: Cam
       val sizes = characteristics.getVideoSizes(cameraDevice.id, imageFormat)
       val size = sizes.closestToOrMax(format?.videoSize)
 
-      Log.i(TAG, "Adding ${size.width} x ${size.height} Video Output in Format #$imageFormat...")
+      Log.i(TAG, "Adding ${size.width}x${size.height} Video Output in ${ImageFormatUtils.imageFormatToString(imageFormat)}...")
       val videoPipeline = VideoPipeline(
         size.width,
         size.height,
@@ -327,8 +364,8 @@ class CameraSession(private val context: Context, private val cameraManager: Cam
         isSelfie,
         video.config.enableFrameProcessor
       )
-      val output = VideoPipelineOutput(videoPipeline, configuration.videoHdr)
+      val output = VideoPipelineOutput(videoPipeline, video.config.enableHdr)
-      outputs.add(output.toOutputConfiguration(characteristics))
+      outputs.add(output)
       videoOutput = output
     }
 
@@ -344,15 +381,16 @@ class CameraSession(private val context: Context, private val cameraManager: Cam
         characteristics.getPreviewTargetSize(null)
       }
 
-      Log.i(TAG, "Adding ${size.width} x ${size.height} Preview Output...")
+      val enableHdr = video?.config?.enableHdr ?: false
+
+      Log.i(TAG, "Adding ${size.width}x${size.height} Preview Output...")
       val output = SurfaceOutput(
         preview.config.surface,
         size,
         SurfaceOutput.OutputType.PREVIEW,
-        configuration.videoHdr
+        enableHdr
       )
-      outputs.add(output.toOutputConfiguration(characteristics))
+      outputs.add(output)
-      previewOutput = output
       previewView?.size = size
     }
 
@@ -363,19 +401,26 @@ class CameraSession(private val context: Context, private val cameraManager: Cam
       val sizes = characteristics.getVideoSizes(cameraDevice.id, imageFormat)
       val size = sizes.closestToOrMax(Size(1280, 720))
 
-      Log.i(TAG, "Adding ${size.width} x ${size.height} CodeScanner Output in Format #$imageFormat...")
+      Log.i(TAG, "Adding ${size.width}x${size.height} CodeScanner Output in ${ImageFormatUtils.imageFormatToString(imageFormat)}...")
       val pipeline = CodeScannerPipeline(size, imageFormat, codeScanner.config, callback)
       val output = BarcodeScannerOutput(pipeline)
-      outputs.add(output.toOutputConfiguration(characteristics))
+      outputs.add(output)
       codeScannerOutput = output
     }
 
-    // Create new session
+    // Create session
     captureSession = cameraDevice.createCaptureSession(cameraManager, outputs, { session ->
-      if (this.captureSession == session) {
+      if (this.captureSession != session) {
-        Log.i(TAG, "Camera Session $session has been closed!")
+        // a previous session has been closed, but we already have a new one.
-        isRunning = false
+        // this is just normal behavior
+        return@createCaptureSession
       }
+
+      // onClosed
+      this.captureSession = null
+      isRunning = false
+
+      Log.i(TAG, "Camera Session $session has been closed.")
     }, CameraQueues.cameraQueue)
 
     Log.i(TAG, "Successfully configured Session with ${outputs.size} outputs for Camera #${cameraDevice.id}!")
@@ -384,45 +429,18 @@ class CameraSession(private val context: Context, private val cameraManager: Cam
     updateVideoOutputs()
   }
 
-  private fun configureCaptureRequest(config: CameraConfiguration) {
+  private fun createRepeatingRequest(device: CameraDevice, targets: List<Surface>, config: CameraConfiguration): CaptureRequest {
-    if (!config.isActive) {
-      // TODO: Do we want to do stopRepeating() or entirely destroy the session?
-      // If the Camera is not active, we don't do anything.
-      captureSession?.stopRepeating()
-      isRunning = false
-      return
-    }
-
-    val device = cameraDevice ?: throw NoCameraDeviceError()
-    val captureSession = captureSession ?: throw CameraNotReadyError()
-
-    val previewOutput = previewOutput
-    if (previewOutput == null) {
-      Log.w(TAG, "Preview Output is null, aborting...")
-      return
-    }
-
     val cameraCharacteristics = cameraManager.getCameraCharacteristics(device.id)
 
     val template = if (config.video.isEnabled) CameraDevice.TEMPLATE_RECORD else CameraDevice.TEMPLATE_PREVIEW
     val captureRequest = device.createCaptureRequest(template)
 
-    captureRequest.addTarget(previewOutput.surface)
+    targets.forEach { t -> captureRequest.addTarget(t) }
-    videoOutput?.let { output ->
-      captureRequest.addTarget(output.surface)
-    }
-    codeScannerOutput?.let { output ->
-      captureRequest.addTarget(output.surface)
-    }
 
     // Set FPS
     // TODO: Check if the FPS range is actually supported in the current configuration.
-    var fps = config.fps
+    val fps = config.fps
     if (fps != null) {
-      if (!CAN_DO_60_FPS) {
-        // If we can't do 60 FPS, we clamp it to 30 FPS - that's always supported.
-        fps = 30.coerceAtMost(fps)
-      }
       captureRequest.set(CaptureRequest.CONTROL_AE_TARGET_FPS_RANGE, Range(fps, fps))
     }
 
@@ -450,7 +468,9 @@ class CameraSession(private val context: Context, private val cameraManager: Cam
 
     // Set HDR
     // TODO: Check if that value is even supported
-    if (config.videoHdr) {
+    val video = config.video as? CameraConfiguration.Output.Enabled<CameraConfiguration.Video>
+    val videoHdr = video?.config?.enableHdr
+    if (videoHdr == true) {
       captureRequest.set(CaptureRequest.CONTROL_SCENE_MODE, CaptureRequest.CONTROL_SCENE_MODE_HDR)
     } else if (config.enableLowLightBoost) {
       captureRequest.set(CaptureRequest.CONTROL_SCENE_MODE, CaptureRequest.CONTROL_SCENE_MODE_NIGHT)
@@ -474,7 +494,30 @@ class CameraSession(private val context: Context, private val cameraManager: Cam
     }
 
     // Start repeating request if the Camera is active
-    val request = captureRequest.build()
+    return captureRequest.build()
+  }
+
+  private fun configureCaptureRequest(config: CameraConfiguration) {
+    val captureSession = captureSession
+
+    if (!config.isActive) {
+      isRunning = false
+      return
+    }
+    if (captureSession == null) {
+      Log.i(TAG, "CameraSession hasn't configured the capture session, skipping CaptureRequest...")
+      return
+    }
+
+    val preview = config.preview as? CameraConfiguration.Output.Enabled<CameraConfiguration.Preview>
+    val previewSurface = preview?.config?.surface
+    val targets = listOfNotNull(previewSurface, videoOutput?.surface, codeScannerOutput?.surface)
+    if (targets.isEmpty()) {
+      Log.i(TAG, "CameraSession has no repeating outputs (Preview, Video, CodeScanner), skipping CaptureRequest...")
+      return
+    }
+
+    val request = createRepeatingRequest(captureSession.device, targets, config)
     captureSession.setRepeatingRequest(request, null, null)
     isRunning = true
   }
@@ -496,7 +539,6 @@ class CameraSession(private val context: Context, private val cameraManager: Cam
 
     val cameraCharacteristics = cameraManager.getCameraCharacteristics(captureSession.device.id)
     val orientation = outputOrientation.toSensorRelativeOrientation(cameraCharacteristics)
-    val enableHdr = configuration?.photoHdr ?: false
     val captureRequest = captureSession.device.createPhotoCaptureRequest(
       cameraManager,
       photoOutput.surface,
@@ -505,7 +547,7 @@ class CameraSession(private val context: Context, private val cameraManager: Cam
       flashMode,
       enableRedEyeReduction,
       enableAutoStabilization,
-      enableHdr,
+      photoOutput.enableHdr,
       orientation
     )
     Log.i(TAG, "Photo capture 1/3 - starting capture...")
@@ -547,12 +589,20 @@ class CameraSession(private val context: Context, private val cameraManager: Cam
       val videoOutput = videoOutput ?: throw VideoNotEnabledError()
       val cameraDevice = cameraDevice ?: throw CameraNotReadyError()
 
-      // TODO: Implement HDR
-      val hdr = configuration?.videoHdr ?: false
       val fps = configuration?.fps ?: 30
 
-      val recording =
+      val recording = RecordingSession(
-        RecordingSession(context, cameraDevice.id, videoOutput.size, enableAudio, fps, hdr, orientation, options, callback, onError)
+        context,
+        cameraDevice.id,
+        videoOutput.size,
+        enableAudio,
+        fps,
+        videoOutput.enableHdr,
+        orientation,
+        options,
+        callback,
+        onError
+      )
       recording.start()
       this.recording = recording
     }
@@ -581,19 +631,7 @@ class CameraSession(private val context: Context, private val cameraManager: Cam
     }
   }
 
-  suspend fun focus(x: Int, y: Int) {
+  suspend fun focus(x: Int, y: Int): Unit = throw NotImplementedError("focus() is not yet implemented!")
-    val captureSession = captureSession ?: throw CameraNotReadyError()
-    val previewOutput = previewOutput ?: throw CameraNotReadyError()
-    val characteristics = cameraManager.getCameraCharacteristics(captureSession.device.id)
-    val sensorSize = characteristics.get(CameraCharacteristics.SENSOR_INFO_ACTIVE_ARRAY_SIZE)!!
-    val previewSize = previewOutput.size
-    val pX = x.toDouble() / previewSize.width * sensorSize.height()
-    val pY = y.toDouble() / previewSize.height * sensorSize.width()
-    val point = Point(pX.toInt(), pY.toInt())
-
-    Log.i(TAG, "Focusing (${point.x}, ${point.y})...")
-    focus(point)
-  }
 
   private suspend fun focus(point: Point) {
     mutex.withLock {

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

@@ -2,7 +2,6 @@ package com.mrousavy.camera.core
 
 import android.annotation.SuppressLint
 import android.content.Context
-import android.hardware.camera2.CameraManager
 import android.util.Log
 import android.util.Size
 import android.view.Gravity
@@ -10,11 +9,7 @@ import android.view.SurfaceHolder
 import android.view.SurfaceView
 import android.widget.FrameLayout
 import com.facebook.react.bridge.UiThreadUtil
-import com.mrousavy.camera.extensions.bigger
 import com.mrousavy.camera.extensions.getMaximumPreviewSize
-import com.mrousavy.camera.extensions.getPreviewTargetSize
-import com.mrousavy.camera.extensions.smaller
-import com.mrousavy.camera.types.CameraDeviceFormat
 import com.mrousavy.camera.types.ResizeMode
 import kotlin.math.roundToInt
 
@@ -49,19 +44,19 @@ class PreviewView(context: Context, callback: SurfaceHolder.Callback) : SurfaceV
     holder.addCallback(callback)
   }
 
-  fun resizeToInputCamera(cameraId: String, cameraManager: CameraManager, format: CameraDeviceFormat?) {
+  /*fun resizeToInputCamera(cameraId: String, cameraManager: CameraManager, format: CameraDeviceFormat?) {
     val characteristics = cameraManager.getCameraCharacteristics(cameraId)
 
     val targetPreviewSize = format?.videoSize
     val formatAspectRatio = if (targetPreviewSize != null) targetPreviewSize.bigger.toDouble() / targetPreviewSize.smaller else null
     size = characteristics.getPreviewTargetSize(formatAspectRatio)
-  }
+  }*/
 
   private fun getSize(contentSize: Size, containerSize: Size, resizeMode: ResizeMode): Size {
     val contentAspectRatio = contentSize.height.toDouble() / contentSize.width
     val containerAspectRatio = containerSize.width.toDouble() / containerSize.height
 
-    Log.d(TAG, "coverSize :: $contentSize ($contentAspectRatio), ${containerSize.width}x${containerSize.height} ($containerAspectRatio)")
+    Log.i(TAG, "Content Size: $contentSize ($contentAspectRatio) | Container Size: $containerSize ($containerAspectRatio)")
 
     val widthOverHeight = when (resizeMode) {
       ResizeMode.COVER -> contentAspectRatio > containerAspectRatio
@@ -82,14 +77,11 @@ class PreviewView(context: Context, callback: SurfaceHolder.Callback) : SurfaceV
   @SuppressLint("DrawAllocation")
   override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
     super.onMeasure(widthMeasureSpec, heightMeasureSpec)
-    val viewWidth = MeasureSpec.getSize(widthMeasureSpec)
-    val viewHeight = MeasureSpec.getSize(heightMeasureSpec)
 
-    Log.i(TAG, "PreviewView onMeasure($viewWidth, $viewHeight)")
+    val viewSize = Size(MeasureSpec.getSize(widthMeasureSpec), MeasureSpec.getSize(heightMeasureSpec))
+    val fittedSize = getSize(size, viewSize, resizeMode)
 
-    val fittedSize = getSize(size, Size(viewWidth, viewHeight), resizeMode)
+    Log.i(TAG, "PreviewView is $viewSize, rendering $size content. Resizing to: $fittedSize ($resizeMode)")
-
-    Log.d(TAG, "Fitted dimensions set: $fittedSize")
     setMeasuredDimension(fittedSize.width, fittedSize.height)
   }
 

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

@@ -40,6 +40,7 @@ class RecordingSession(
   private var startTime: Long? = null
   val surface: Surface = MediaCodec.createPersistentInputSurface()
 
+  // TODO: Implement HDR
   init {
     outputFile = File.createTempFile("mrousavy", options.fileType.toExtension(), context.cacheDir)
 

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

@@ -3,7 +3,7 @@ package com.mrousavy.camera.core.outputs
 import android.media.ImageReader
 import android.util.Log
 import android.util.Size
-import java.io.Closeable
+import com.mrousavy.camera.utils.ImageFormatUtils
 
 open class PhotoOutput(private val imageReader: ImageReader, enableHdr: Boolean = false) :
   SurfaceOutput(
@@ -11,13 +11,15 @@ open class PhotoOutput(private val imageReader: ImageReader, enableHdr: Boolean
     Size(imageReader.width, imageReader.height),
     OutputType.PHOTO,
     enableHdr
-  ),
+  ) {
-  Closeable {
   override fun close() {
     Log.i(TAG, "Closing ${imageReader.width}x${imageReader.height} $outputType ImageReader..")
     imageReader.close()
     super.close()
   }
 
-  override fun toString(): String = "$outputType (${imageReader.width} x ${imageReader.height} in format #${imageReader.imageFormat})"
+  override fun toString(): String =
+    "$outputType (${size.width}x${size.height} in ${ImageFormatUtils.imageFormatToString(
+      imageReader.imageFormat
+    )})"
 }

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

@@ -14,7 +14,7 @@ open class SurfaceOutput(
   val surface: Surface,
   val size: Size,
   val outputType: OutputType,
-  private val enableHdr: Boolean = false,
+  val enableHdr: Boolean = false,
   private val closeSurfaceOnEnd: Boolean = false
 ) : Closeable {
   companion object {

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

@@ -19,5 +19,5 @@ class VideoPipelineOutput(val videoPipeline: VideoPipeline, enableHdr: Boolean =
     super.close()
   }
 
-  override fun toString(): String = "$outputType (${videoPipeline.width} x ${videoPipeline.height} in format #${videoPipeline.format})"
+  override fun toString(): String = "$outputType (${size.width}x${size.height} in ${videoPipeline.format})"
 }

package/android/src/main/java/com/mrousavy/camera/extensions/CameraDevice+createCaptureSession.kt

@@ -4,22 +4,22 @@ import android.hardware.camera2.CameraCaptureSession
 import android.hardware.camera2.CameraCharacteristics
 import android.hardware.camera2.CameraDevice
 import android.hardware.camera2.CameraManager
-import android.hardware.camera2.params.OutputConfiguration
 import android.hardware.camera2.params.SessionConfiguration
 import android.os.Build
 import android.util.Log
 import com.mrousavy.camera.core.CameraQueues
 import com.mrousavy.camera.core.CameraSessionCannotBeConfiguredError
+import com.mrousavy.camera.core.outputs.SurfaceOutput
 import kotlin.coroutines.resume
 import kotlin.coroutines.resumeWithException
 import kotlinx.coroutines.suspendCancellableCoroutine
 
 private const val TAG = "CreateCaptureSession"
-private var sessionId = 1000
+private var sessionId = 1
 
 suspend fun CameraDevice.createCaptureSession(
   cameraManager: CameraManager,
-  outputs: List<OutputConfiguration>,
+  outputs: List<SurfaceOutput>,
   onClosed: (session: CameraCaptureSession) -> Unit,
   queue: CameraQueues.CameraQueue
 ): CameraCaptureSession =
@@ -29,34 +29,35 @@ suspend fun CameraDevice.createCaptureSession(
     val sessionId = sessionId++
     Log.i(
       TAG,
-      "Camera $id: Creating Capture Session #$sessionId... " +
+      "Camera #$id: Creating Capture Session #$sessionId... " +
-        "Hardware Level: $hardwareLevel} | Outputs: $outputs"
+        "(Hardware Level: $hardwareLevel | Outputs: [${outputs.joinToString()}])"
     )
 
     val callback = object : CameraCaptureSession.StateCallback() {
       override fun onConfigured(session: CameraCaptureSession) {
-        Log.i(TAG, "Camera $id: Capture Session #$sessionId configured!")
+        Log.i(TAG, "Camera #$id: Successfully created CameraCaptureSession #$sessionId!")
         continuation.resume(session)
       }
 
       override fun onConfigureFailed(session: CameraCaptureSession) {
-        Log.e(TAG, "Camera $id: Failed to configure Capture Session #$sessionId!")
+        Log.e(TAG, "Camera #$id: Failed to create CameraCaptureSession #$sessionId!")
         continuation.resumeWithException(CameraSessionCannotBeConfiguredError(id))
       }
 
       override fun onClosed(session: CameraCaptureSession) {
+        Log.i(TAG, "Camera #$id: CameraCaptureSession #$sessionId has been closed.")
         super.onClosed(session)
-        Log.i(TAG, "Camera $id: Capture Session #$sessionId closed!")
         onClosed(session)
       }
     }
 
+    val configurations = outputs.map { it.toOutputConfiguration(characteristics) }
     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
       Log.i(TAG, "Using new API (>=28)")
-      val config = SessionConfiguration(SessionConfiguration.SESSION_REGULAR, outputs, queue.executor, callback)
+      val config = SessionConfiguration(SessionConfiguration.SESSION_REGULAR, configurations, queue.executor, callback)
       this.createCaptureSession(config)
     } else {
       Log.i(TAG, "Using legacy API (<28)")
-      this.createCaptureSessionByOutputConfigurations(outputs, callback, queue.handler)
+      this.createCaptureSessionByOutputConfigurations(configurations, callback, queue.handler)
     }
   }

package/android/src/main/java/com/mrousavy/camera/extensions/CameraManager+openCamera.kt

@@ -18,30 +18,30 @@ private const val TAG = "CameraManager"
 @SuppressLint("MissingPermission")
 suspend fun CameraManager.openCamera(
   cameraId: String,
-  onDisconnected: (camera: CameraDevice, reason: Throwable) -> Unit,
+  onDisconnected: (camera: CameraDevice, error: Throwable?) -> Unit,
   queue: CameraQueues.CameraQueue
 ): CameraDevice =
   suspendCancellableCoroutine { continuation ->
-    Log.i(TAG, "Camera $cameraId: Opening...")
+    Log.i(TAG, "Camera #$cameraId: Opening...")
 
     val callback = object : CameraDevice.StateCallback() {
       override fun onOpened(camera: CameraDevice) {
-        Log.i(TAG, "Camera $cameraId: Opened!")
+        Log.i(TAG, "Camera #$cameraId: Opened!")
         continuation.resume(camera)
       }
 
       override fun onDisconnected(camera: CameraDevice) {
-        Log.i(TAG, "Camera $cameraId: Disconnected!")
+        Log.i(TAG, "Camera #$cameraId: Disconnected!")
         if (continuation.isActive) {
           continuation.resumeWithException(CameraCannotBeOpenedError(cameraId, CameraDeviceError.DISCONNECTED))
         } else {
-          onDisconnected(camera, CameraDisconnectedError(cameraId, CameraDeviceError.DISCONNECTED))
+          onDisconnected(camera, null)
         }
         camera.close()
       }
 
       override fun onError(camera: CameraDevice, errorCode: Int) {
-        Log.e(TAG, "Camera $cameraId: Error! $errorCode")
+        Log.e(TAG, "Camera #$cameraId: Error! $errorCode")
         val error = CameraDeviceError.fromCameraDeviceError(errorCode)
         if (continuation.isActive) {
           continuation.resumeWithException(CameraCannotBeOpenedError(cameraId, error))

package/android/src/main/java/com/mrousavy/camera/types/PixelFormat.kt

@@ -1,8 +1,10 @@
 package com.mrousavy.camera.types
 
 import android.graphics.ImageFormat
+import android.util.Log
 import com.mrousavy.camera.core.InvalidTypeScriptUnionError
 import com.mrousavy.camera.core.PixelFormatNotSupportedError
+import com.mrousavy.camera.utils.ImageFormatUtils
 
 enum class PixelFormat(override val unionValue: String) : JSUnionValue {
   YUV("yuv"),
@@ -18,11 +20,15 @@ enum class PixelFormat(override val unionValue: String) : JSUnionValue {
     }
 
   companion object : JSUnionValue.Companion<PixelFormat> {
+    private const val TAG = "PixelFormat"
     fun fromImageFormat(imageFormat: Int): PixelFormat =
       when (imageFormat) {
         ImageFormat.YUV_420_888 -> YUV
         ImageFormat.PRIVATE -> NATIVE
-        else -> UNKNOWN
+        else -> {
+          Log.w(TAG, "Unknown PixelFormat! ${ImageFormatUtils.imageFormatToString(imageFormat)}")
+          UNKNOWN
+        }
       }
 
     override fun fromUnionValue(unionValue: String?): PixelFormat =

package/android/src/main/java/com/mrousavy/camera/utils/ImageFormatUtils.kt

@@ -0,0 +1,28 @@
+package com.mrousavy.camera.utils
+
+import android.graphics.ImageFormat
+import android.graphics.PixelFormat
+
+class ImageFormatUtils {
+  companion object {
+    fun imageFormatToString(format: Int): String =
+      when (format) {
+        ImageFormat.YUV_420_888 -> "YUV_420_888"
+        ImageFormat.NV21 -> "NV21"
+        ImageFormat.NV16 -> "NV16"
+        ImageFormat.YV12 -> "YV12"
+        ImageFormat.YUV_422_888 -> "YUV_422_888"
+        ImageFormat.YCBCR_P010 -> "YCBCR_P010"
+        ImageFormat.YUV_444_888 -> "YUV_444_888"
+        ImageFormat.YUY2 -> "YUY2"
+        ImageFormat.Y8 -> "Y8"
+        ImageFormat.JPEG -> "JPEG"
+        ImageFormat.RGB_565 -> "RGB_565"
+        ImageFormat.FLEX_RGB_888 -> "FLEX_RGB_888"
+        ImageFormat.FLEX_RGBA_8888 -> "FLEX_RGBA_8888"
+        PixelFormat.RGB_888 -> "RGB_888"
+        ImageFormat.PRIVATE -> "PRIVATE"
+        else -> "UNKNOWN ($format)"
+      }
+  }
+}

package/ios/CameraView.swift

@@ -84,6 +84,7 @@ public final class CameraView: UIView, CameraSessionDelegate {
   // CameraView+Zoom
   var pinchGestureRecognizer: UIPinchGestureRecognizer?
   var pinchScaleOffset: CGFloat = 1.0
+  private var currentConfigureCall: DispatchTime?
 
   var previewView: PreviewView
   #if DEBUG
@@ -150,8 +151,18 @@ public final class CameraView: UIView, CameraSessionDelegate {
   // pragma MARK: Props updating
   override public final func didSetProps(_ changedProps: [String]!) {
     ReactLogger.log(level: .info, message: "Updating \(changedProps.count) props: [\(changedProps.joined(separator: ", "))]")
+    let now = DispatchTime.now()
+    currentConfigureCall = now
+
+    cameraSession.configure { [self] config in
+      // Check if we're still the latest call to configure { ... }
+      guard currentConfigureCall == now else {
+        // configure waits for a lock, and if a new call to update() happens in the meantime we can drop this one.
+        // this works similar to how React implemented concurrent rendering, the newer call to update() has higher priority.
+        ReactLogger.log(level: .info, message: "A new configure { ... } call arrived, aborting this one...")
+        return
+      }
 
-    cameraSession.configure { config in
       // Input Camera Device
       config.cameraId = cameraId as? String
 

package/ios/Core/CameraSession.swift

@@ -98,29 +98,21 @@ class CameraSession: NSObject, AVCaptureVideoDataOutputSampleBufferDelegate, AVC
    Any changes in here will be re-configured only if required, and under a lock.
    The `configuration` object is a copy of the currently active configuration that can be modified by the caller in the lambda.
    */
-  func configure(_ lambda: (_ configuration: CameraConfiguration) throws -> Void) {
+  func configure(_ lambda: @escaping (_ configuration: CameraConfiguration) throws -> Void) {
-    // This is the latest call to configure()
+    ReactLogger.log(level: .info, message: "configure { ... }: Waiting for lock...")
-    let time = DispatchTime.now()
-    currentConfigureCall = time
-
-    ReactLogger.log(level: .info, message: "Updating Session Configuration...")
-
-    // Let caller configure a new configuration for the Camera.
-    let config = CameraConfiguration(copyOf: configuration)
-    do {
-      try lambda(config)
-    } catch {
-      onConfigureError(error)
-    }
-    let difference = CameraConfiguration.Difference(between: configuration, and: config)
 
     // Set up Camera (Video) Capture Session (on camera queue, acts like a lock)
     CameraQueues.cameraQueue.async {
-      // Cancel configuration if there has already been a new config
+      // Let caller configure a new configuration for the Camera.
-      guard self.currentConfigureCall == time else {
+      let config = CameraConfiguration(copyOf: self.configuration)
-        // configure() has been called again just now, skip this one so the new call takes over.
+      do {
-        return
+        try lambda(config)
+      } catch {
+        self.onConfigureError(error)
       }
+      let difference = CameraConfiguration.Difference(between: self.configuration, and: config)
+
+      ReactLogger.log(level: .info, message: "configure { ... }: Updating CameraSession Configuration... \(difference)")
 
       do {
         // If needed, configure the AVCaptureSession (inputs, outputs)