vout iOS: reliability improvements

modules/video_output/ios2.m

@@ -139,7 +139,10 @@ static int Open(vlc_object_t *this)
 
     /* get the object we will draw into */
     UIView* viewContainer = var_CreateGetAddress (vd, "drawable-nsobject");
-    if (!viewContainer)
+    if (unlikely(viewContainer == nil))
+        goto bailout;
+
+    if (unlikely(![viewContainer respondsToSelector:@selector(isKindOfClass:)]))
         goto bailout;
 
     if (![viewContainer isKindOfClass:[UIView class]])
@@ -400,6 +403,11 @@ static void OpenglESSwap(vlc_gl_t *gl)
     if (!self)
         return nil;
 
+    @synchronized (self) {
+        _appActive = ([UIApplication sharedApplication].applicationState == UIApplicationStateActive);
+        if (unlikely(!_appActive))
+            return nil;
+
         CAEAGLLayer * layer = (CAEAGLLayer *)self.layer;
         layer.drawableProperties = [NSDictionary dictionaryWithObject:kEAGLColorFormatRGBA8 forKey: kEAGLDrawablePropertyColorFormat];
         layer.opaque = YES;
@@ -412,9 +420,6 @@ static void OpenglESSwap(vlc_gl_t *gl)
         [self performSelectorOnMainThread:@selector(createBuffers) withObject:nil waitUntilDone:YES];
         [self performSelectorOnMainThread:@selector(reshape) withObject:nil waitUntilDone:NO];
         [self setAutoresizingMask: UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight];
-
-    @synchronized (self) {
-        _appActive = ([UIApplication sharedApplication].applicationState == UIApplicationStateActive);
     }
 
     return self;