set surfaceHolder when not null

Live/src/main/java/com/frank/live/camera/CameraHelper.java

@@ -114,7 +114,6 @@ public class CameraHelper implements SurfaceHolder.Callback, Camera.PreviewCallb
         parameters.setPreviewSize(mWidth, mHeight);
     }
 
-
     public void setPreviewDisplay(SurfaceHolder surfaceHolder) {
         mSurfaceHolder = surfaceHolder;
         mSurfaceHolder.addCallback(this);
@@ -160,7 +159,7 @@ public class CameraHelper implements SurfaceHolder.Callback, Camera.PreviewCallb
         int index = 0;
         int ySize = mWidth * mHeight;
         int uvHeight = mHeight / 2;
-        //back camera rotate 90 deree
+        //back camera
         if (mCameraId == Camera.CameraInfo.CAMERA_FACING_BACK) {
 
             for (int i = 0; i < mWidth; i++) {
@@ -177,8 +176,7 @@ public class CameraHelper implements SurfaceHolder.Callback, Camera.PreviewCallb
                     bytes[index++] = data[ySize + mWidth * j + i + 1];
                 }
             }
-        } else {
-            //rotate 90 degree
+        } else { // front camera
             for (int i = 0; i < mWidth; i++) {
                 int nPos = mWidth - 1;
                 for (int j = 0; j < mHeight; j++) {

app/src/main/java/com/frank/ffmpeg/activity/LiveActivity.kt

@@ -83,12 +83,11 @@ open class LiveActivity : BaseActivity(), CompoundButton.OnCheckedChangeListener
         val audioParam = AudioParam(sampleRate, channelConfig, audioFormat, numChannels)
         // Camera1: SurfaceView  Camera2: TextureView
         livePusher = LivePusherNew(this, videoParam, audioParam, liveView, CameraType.CAMERA2)
-        var holder :SurfaceHolder ?= null
         if (liveView is SurfaceView) {
-            holder = (liveView as SurfaceView).holder
-        }
+            val holder: SurfaceHolder = (liveView as SurfaceView).holder
             livePusher!!.setPreviewDisplay(holder)
         }
+    }
 
     private fun registerBroadcast(networkChangeListener: OnNetworkChangeListener) {
         connectionReceiver = ConnectionReceiver(networkChangeListener)