fix(VideoPlayer): Fixed playing issue

When source changed in runtime - player started playing for no reason, this commit fixes that
problem

Author: Shahen Hovhannisyan

ios/RNVideoProcessing/RNVideoPlayer.swift

@@ -33,6 +33,7 @@ class RNVideoPlayer: RCTView {
     var _playerEndTime: CGFloat = 0
     var _replay: Bool = false
     var _rotate: Bool = false
+    var isInitialized = false
     var _resizeMode = AVLayerVideoGravityResizeAspect
     var onChange: RCTBubblingEventBlock?
 
@@ -338,8 +339,10 @@ class RNVideoPlayer: RCTView {
 
         let movieURL = NSURL(string: _moviePathSource as String)
 
-        player = AVPlayer()
-        player.volume = Float(self.playerVolume)
+        if self.player == nil {
+            player = AVPlayer()
+            player.volume = Float(self.playerVolume)
+        }
         playerItem = AVPlayerItem(url: movieURL as! URL)
         player.replaceCurrentItem(with: playerItem)
 
@@ -357,16 +360,22 @@ class RNVideoPlayer: RCTView {
         self._playerEndTime = CGFloat(CMTimeGetSeconds((player.currentItem?.asset.duration)!))
         print("CHANGED playerEndTime \(self._playerEndTime)")
 
+        if self.gpuMovie != nil {
+            gpuMovie.endProcessing()
+        }
         gpuMovie = GPUImageMovie(playerItem: playerItem)
         // gpuMovie.runBenchmark = true
         gpuMovie.playAtActualSpeed = true
         gpuMovie.startProcessing()
 
         gpuMovie.addTarget(self.filterView)
-        self.addSubview(filterView)
+        if !self.isInitialized {
+            self.addSubview(filterView)
+            self.createPlayerObservers()
+        }
         gpuMovie.playAtActualSpeed = true
 
-        self.createPlayerObservers()
+        self.isInitialized = true
     }
 
     override func willMove(toSuperview newSuperview: UIView?) {