diff --git a/cameraview/src/main/java/com/otaliastudios/cameraview/CameraView.java b/cameraview/src/main/java/com/otaliastudios/cameraview/CameraView.java
index f5140eb2b..1ab80b374 100644
--- a/cameraview/src/main/java/com/otaliastudios/cameraview/CameraView.java
+++ b/cameraview/src/main/java/com/otaliastudios/cameraview/CameraView.java
@@ -1,5 +1,10 @@
 package com.otaliastudios.cameraview;
 
+import static android.view.View.MeasureSpec.AT_MOST;
+import static android.view.View.MeasureSpec.EXACTLY;
+import static android.view.View.MeasureSpec.UNSPECIFIED;
+import static android.view.ViewGroup.LayoutParams.MATCH_PARENT;
+
 import android.Manifest;
 import android.annotation.SuppressLint;
 import android.annotation.TargetApi;
@@ -66,8 +71,8 @@
 import com.otaliastudios.cameraview.gesture.PinchGestureFinder;
 import com.otaliastudios.cameraview.gesture.ScrollGestureFinder;
 import com.otaliastudios.cameraview.gesture.TapGestureFinder;
-import com.otaliastudios.cameraview.internal.GridLinesLayout;
 import com.otaliastudios.cameraview.internal.CropHelper;
+import com.otaliastudios.cameraview.internal.GridLinesLayout;
 import com.otaliastudios.cameraview.internal.OrientationHelper;
 import com.otaliastudios.cameraview.markers.AutoFocusMarker;
 import com.otaliastudios.cameraview.markers.AutoFocusTrigger;
@@ -99,11 +104,6 @@
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicInteger;
 
-import static android.view.View.MeasureSpec.AT_MOST;
-import static android.view.View.MeasureSpec.EXACTLY;
-import static android.view.View.MeasureSpec.UNSPECIFIED;
-import static android.view.ViewGroup.LayoutParams.MATCH_PARENT;
-
 /**
  * Entry point for the whole library.
  * Please read documentation for usage and full set of features.
@@ -2742,5 +2742,8 @@ public Filter getFilter() {
 
     }
 
+    public void reloadDisplayOrientation() {
+        mCameraEngine.reloadDisplayOrientation();
+    }
     //endregion
 }
diff --git a/cameraview/src/main/java/com/otaliastudios/cameraview/CustomConstants.java b/cameraview/src/main/java/com/otaliastudios/cameraview/CustomConstants.java
new file mode 100644
index 000000000..a324ce9be
--- /dev/null
+++ b/cameraview/src/main/java/com/otaliastudios/cameraview/CustomConstants.java
@@ -0,0 +1,10 @@
+package com.otaliastudios.cameraview;
+
+public class CustomConstants {
+
+    //前后置摄像头的偏移角度,为了解决部分终端摄像头旋转角度不对的问题
+    public static int front_media_camera_rotate = -1;
+    public static int back_media_camera_rotate = -1;
+    public static boolean front_media_camera_reverse_width_height = false;
+    public static boolean back_media_camera_reverse_width_height = false;
+}
diff --git a/cameraview/src/main/java/com/otaliastudios/cameraview/controls/Facing.java b/cameraview/src/main/java/com/otaliastudios/cameraview/controls/Facing.java
index 90684b11e..af3830f78 100644
--- a/cameraview/src/main/java/com/otaliastudios/cameraview/controls/Facing.java
+++ b/cameraview/src/main/java/com/otaliastudios/cameraview/controls/Facing.java
@@ -24,7 +24,9 @@ public enum Facing implements Control {
     /**
      * Front-facing camera sensor.
      */
-    FRONT(1);
+    FRONT(1),
+
+    RED(3);
 
     @NonNull
     static Facing DEFAULT(@Nullable Context context) {
diff --git a/cameraview/src/main/java/com/otaliastudios/cameraview/engine/Camera1Engine.java b/cameraview/src/main/java/com/otaliastudios/cameraview/engine/Camera1Engine.java
index 6f976f089..e7dec58ff 100644
--- a/cameraview/src/main/java/com/otaliastudios/cameraview/engine/Camera1Engine.java
+++ b/cameraview/src/main/java/com/otaliastudios/cameraview/engine/Camera1Engine.java
@@ -9,17 +9,25 @@
 import android.hardware.Camera;
 import android.location.Location;
 import android.os.Build;
+import android.view.SurfaceHolder;
+
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.annotation.VisibleForTesting;
 
-import android.view.SurfaceHolder;
-
 import com.google.android.gms.tasks.Task;
 import com.google.android.gms.tasks.Tasks;
 import com.otaliastudios.cameraview.CameraException;
 import com.otaliastudios.cameraview.CameraOptions;
+import com.otaliastudios.cameraview.CustomConstants;
+import com.otaliastudios.cameraview.PictureResult;
+import com.otaliastudios.cameraview.VideoResult;
+import com.otaliastudios.cameraview.controls.Facing;
+import com.otaliastudios.cameraview.controls.Flash;
+import com.otaliastudios.cameraview.controls.Hdr;
+import com.otaliastudios.cameraview.controls.Mode;
 import com.otaliastudios.cameraview.controls.PictureFormat;
+import com.otaliastudios.cameraview.controls.WhiteBalance;
 import com.otaliastudios.cameraview.engine.mappers.Camera1Mapper;
 import com.otaliastudios.cameraview.engine.metering.Camera1MeteringTransform;
 import com.otaliastudios.cameraview.engine.offset.Axis;
@@ -28,15 +36,8 @@
 import com.otaliastudios.cameraview.engine.orchestrator.CameraState;
 import com.otaliastudios.cameraview.frame.ByteBufferFrameManager;
 import com.otaliastudios.cameraview.frame.Frame;
-import com.otaliastudios.cameraview.PictureResult;
-import com.otaliastudios.cameraview.VideoResult;
-import com.otaliastudios.cameraview.controls.Facing;
-import com.otaliastudios.cameraview.controls.Flash;
 import com.otaliastudios.cameraview.frame.FrameManager;
 import com.otaliastudios.cameraview.gesture.Gesture;
-import com.otaliastudios.cameraview.controls.Hdr;
-import com.otaliastudios.cameraview.controls.Mode;
-import com.otaliastudios.cameraview.controls.WhiteBalance;
 import com.otaliastudios.cameraview.internal.CropHelper;
 import com.otaliastudios.cameraview.metering.MeteringRegions;
 import com.otaliastudios.cameraview.metering.MeteringTransform;
@@ -140,6 +141,10 @@ protected boolean collectCameraInfo(@NonNull Facing facing) {
                 "Internal:", internalFacing,
                 "Cameras:", Camera.getNumberOfCameras());
         Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
+        if (internalFacing == 3) {
+            mCameraId = 3;
+            return true;
+        }
         for (int i = 0, count = Camera.getNumberOfCameras(); i < count; i++) {
             Camera.getCameraInfo(i, cameraInfo);
             if (cameraInfo.facing == internalFacing) {
@@ -184,8 +189,15 @@ protected Task<CameraOptions> onStartEngine() {
             throw new CameraException(e, CameraException.REASON_FAILED_TO_CONNECT);
         }
         try {
-            mCamera.setDisplayOrientation(getAngles().offset(Reference.SENSOR, Reference.VIEW,
-                    Axis.ABSOLUTE)); // <- not allowed during preview
+            // <- not allowed during preview
+            int offset = getAngles().offset(Reference.SENSOR, Reference.VIEW, Axis.ABSOLUTE);
+            int front_media_camera_rotate = CustomConstants.front_media_camera_rotate;
+            int back_media_camera_rotate = CustomConstants.back_media_camera_rotate;
+            if(getFacing() == Facing.BACK){
+                mCamera.setDisplayOrientation(back_media_camera_rotate >= 0 ? back_media_camera_rotate : offset);
+            }else{
+                mCamera.setDisplayOrientation(front_media_camera_rotate >= 0 ? front_media_camera_rotate : offset);
+            }
         } catch (Exception e) {
             LOG.e("onStartEngine:", "Failed to connect. Can't set display orientation, maybe preview already exists?");
             throw new CameraException(CameraException.REASON_FAILED_TO_CONNECT);
@@ -194,6 +206,19 @@ protected Task<CameraOptions> onStartEngine() {
         return Tasks.forResult(mCameraOptions);
     }
 
+    @Override
+    public void reloadDisplayOrientation() {
+        if (null == mCamera) return;
+        int offset = getAngles().offset(Reference.SENSOR, Reference.VIEW, Axis.ABSOLUTE);
+        int front_media_camera_rotate = CustomConstants.front_media_camera_rotate;
+        int back_media_camera_rotate = CustomConstants.back_media_camera_rotate;
+        if(getFacing() == Facing.BACK){
+            mCamera.setDisplayOrientation(back_media_camera_rotate >= 0 ? back_media_camera_rotate : offset);
+        }else{
+            mCamera.setDisplayOrientation(front_media_camera_rotate >= 0 ? front_media_camera_rotate : offset);
+        }
+    }
+
     @EngineThread
     @NonNull
     @Override
@@ -229,7 +254,20 @@ protected Task<Void> onStartPreview() {
         if (previewSize == null) {
             throw new IllegalStateException("previewStreamSize should not be null at this point.");
         }
-        mPreview.setStreamSize(previewSize.getWidth(), previewSize.getHeight());
+
+        if (this.getFacing() == Facing.BACK) {
+            if(CustomConstants.back_media_camera_reverse_width_height){
+                this.mPreview.setStreamSize(previewSize.getHeight(), previewSize.getWidth());
+            }else{
+                this.mPreview.setStreamSize(previewSize.getWidth(), previewSize.getHeight());
+            }
+        } else {
+            if(CustomConstants.front_media_camera_reverse_width_height){
+                this.mPreview.setStreamSize(previewSize.getHeight(), previewSize.getWidth());
+            }else{
+                this.mPreview.setStreamSize(previewSize.getWidth(), previewSize.getHeight());
+            }
+        }
         mPreview.setDrawRotation(0);
 
         Camera.Parameters params;
diff --git a/cameraview/src/main/java/com/otaliastudios/cameraview/engine/Camera2Engine.java b/cameraview/src/main/java/com/otaliastudios/cameraview/engine/Camera2Engine.java
index a8d2fd631..37194772b 100644
--- a/cameraview/src/main/java/com/otaliastudios/cameraview/engine/Camera2Engine.java
+++ b/cameraview/src/main/java/com/otaliastudios/cameraview/engine/Camera2Engine.java
@@ -470,6 +470,8 @@ public void onError(@NonNull CameraDevice camera, int error) {
         return task.getTask();
     }
 
+
+
     @EngineThread
     @NonNull
     @Override
@@ -1361,6 +1363,11 @@ public void setPlaySounds(boolean playSounds) {
         mPlaySoundsTask = Tasks.forResult(null);
     }
 
+    @Override
+    public void reloadDisplayOrientation() {
+
+    }
+
     @Override
     public void setPreviewFrameRate(float previewFrameRate) {
         final float oldPreviewFrameRate = mPreviewFrameRate;
diff --git a/cameraview/src/main/java/com/otaliastudios/cameraview/engine/CameraEngine.java b/cameraview/src/main/java/com/otaliastudios/cameraview/engine/CameraEngine.java
index 0614789dc..ddd7acda6 100644
--- a/cameraview/src/main/java/com/otaliastudios/cameraview/engine/CameraEngine.java
+++ b/cameraview/src/main/java/com/otaliastudios/cameraview/engine/CameraEngine.java
@@ -3,11 +3,13 @@
 import android.content.Context;
 import android.graphics.PointF;
 import android.location.Location;
-
-
 import android.os.Handler;
 import android.os.Looper;
 
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.annotation.VisibleForTesting;
+
 import com.google.android.gms.tasks.OnCompleteListener;
 import com.google.android.gms.tasks.OnSuccessListener;
 import com.google.android.gms.tasks.SuccessContinuation;
@@ -17,37 +19,33 @@
 import com.otaliastudios.cameraview.CameraLogger;
 import com.otaliastudios.cameraview.CameraOptions;
 import com.otaliastudios.cameraview.PictureResult;
+import com.otaliastudios.cameraview.VideoResult;
+import com.otaliastudios.cameraview.controls.Audio;
 import com.otaliastudios.cameraview.controls.AudioCodec;
+import com.otaliastudios.cameraview.controls.Facing;
+import com.otaliastudios.cameraview.controls.Flash;
+import com.otaliastudios.cameraview.controls.Hdr;
+import com.otaliastudios.cameraview.controls.Mode;
 import com.otaliastudios.cameraview.controls.PictureFormat;
+import com.otaliastudios.cameraview.controls.VideoCodec;
+import com.otaliastudios.cameraview.controls.WhiteBalance;
+import com.otaliastudios.cameraview.engine.offset.Angles;
+import com.otaliastudios.cameraview.engine.offset.Reference;
 import com.otaliastudios.cameraview.engine.orchestrator.CameraOrchestrator;
 import com.otaliastudios.cameraview.engine.orchestrator.CameraState;
 import com.otaliastudios.cameraview.engine.orchestrator.CameraStateOrchestrator;
-import com.otaliastudios.cameraview.metering.MeteringRegions;
-import com.otaliastudios.cameraview.overlay.Overlay;
-import com.otaliastudios.cameraview.VideoResult;
-import com.otaliastudios.cameraview.engine.offset.Angles;
-import com.otaliastudios.cameraview.engine.offset.Reference;
 import com.otaliastudios.cameraview.frame.Frame;
 import com.otaliastudios.cameraview.frame.FrameManager;
+import com.otaliastudios.cameraview.gesture.Gesture;
 import com.otaliastudios.cameraview.internal.WorkerHandler;
+import com.otaliastudios.cameraview.metering.MeteringRegions;
+import com.otaliastudios.cameraview.overlay.Overlay;
 import com.otaliastudios.cameraview.picture.PictureRecorder;
 import com.otaliastudios.cameraview.preview.CameraPreview;
-import com.otaliastudios.cameraview.controls.Audio;
-import com.otaliastudios.cameraview.controls.Facing;
-import com.otaliastudios.cameraview.controls.Flash;
-import com.otaliastudios.cameraview.gesture.Gesture;
-import com.otaliastudios.cameraview.controls.Hdr;
-import com.otaliastudios.cameraview.controls.Mode;
-import com.otaliastudios.cameraview.controls.VideoCodec;
-import com.otaliastudios.cameraview.controls.WhiteBalance;
 import com.otaliastudios.cameraview.size.Size;
 import com.otaliastudios.cameraview.size.SizeSelector;
 import com.otaliastudios.cameraview.video.VideoRecorder;
 
-import androidx.annotation.NonNull;
-import androidx.annotation.Nullable;
-import androidx.annotation.VisibleForTesting;
-
 import java.io.File;
 import java.io.FileDescriptor;
 import java.util.concurrent.Callable;
@@ -104,7 +102,7 @@
  *
  * For convenience, the two main method {@link #onStartEngine()} and {@link #onStopEngine()}
  * are already called on the engine thread, but they can still be asynchronous by returning a
- * Google's {@link com.google.android.gms.tasks.Task}.
+ * Google's {@link Task}.
  */
 public abstract class CameraEngine implements
         CameraPreview.SurfaceCallback,
@@ -376,6 +374,7 @@ protected Task<Void> restartPreview() {
 
     //region Start & Stop the engine
 
+
     @NonNull
     @EngineThread
     private Task<Void> startEngine() {
@@ -723,6 +722,6 @@ public abstract void takeVideo(@NonNull VideoResult.Stub stub,
                                    @Nullable FileDescriptor fileDescriptor);
     public abstract void takeVideoSnapshot(@NonNull VideoResult.Stub stub, @NonNull File file);
     public abstract void stopVideo();
-
+    public abstract void reloadDisplayOrientation();
     //endregion
 }
diff --git a/cameraview/src/main/java/com/otaliastudios/cameraview/engine/mappers/Camera1Mapper.java b/cameraview/src/main/java/com/otaliastudios/cameraview/engine/mappers/Camera1Mapper.java
index 95f288b40..6594d06b4 100644
--- a/cameraview/src/main/java/com/otaliastudios/cameraview/engine/mappers/Camera1Mapper.java
+++ b/cameraview/src/main/java/com/otaliastudios/cameraview/engine/mappers/Camera1Mapper.java
@@ -42,6 +42,7 @@ public static Camera1Mapper get() {
         FLASH.put(Flash.TORCH, Camera.Parameters.FLASH_MODE_TORCH);
         FACING.put(Facing.BACK, Camera.CameraInfo.CAMERA_FACING_BACK);
         FACING.put(Facing.FRONT, Camera.CameraInfo.CAMERA_FACING_FRONT);
+        FACING.put(Facing.RED, 3);
         WB.put(WhiteBalance.AUTO, Camera.Parameters.WHITE_BALANCE_AUTO);
         WB.put(WhiteBalance.INCANDESCENT, Camera.Parameters.WHITE_BALANCE_INCANDESCENT);
         WB.put(WhiteBalance.FLUORESCENT, Camera.Parameters.WHITE_BALANCE_FLUORESCENT);
diff --git a/demo/src/main/res/layout/activity_camera.xml b/demo/src/main/res/layout/activity_camera.xml
index 2cc1d8a5a..9e7fe268e 100644
--- a/demo/src/main/res/layout/activity_camera.xml
+++ b/demo/src/main/res/layout/activity_camera.xml
@@ -16,7 +16,7 @@
         android:layout_marginBottom="88dp"
         android:keepScreenOn="true"
         app:cameraExperimental="true"
-        app:cameraEngine="camera2"
+        app:cameraEngine="camera1"
         app:cameraPreview="glSurface"
         app:cameraPlaySounds="true"
         app:cameraGrid="off"