feat(ios): add blurIntensity support for PiP video call view

ios/RCTWebRTC/PIPController.h

@@ -13,6 +13,7 @@ API_AVAILABLE(ios(15.0))
 @property(nonatomic, assign) BOOL startAutomatically;
 @property(nonatomic, assign) BOOL stopAutomatically;
 @property(nonatomic, assign) CGSize preferredSize;
+@property(nonatomic, assign) CGFloat blurIntensity;
 
 - (instancetype)initWithSourceView:(UIView *)sourceView;
 - (void)togglePIP;

ios/RCTWebRTC/PIPController.m

@@ -127,6 +127,11 @@ - (void)setPreferredSize:(CGSize)size {
     }
 }
 
+- (void)setBlurIntensity:(CGFloat)blurIntensity {
+    _blurIntensity = blurIntensity;
+    _sampleView.blurIntensity = blurIntensity;
+}
+
 - (BOOL)startAutomatically {
     return _pipController.canStartPictureInPictureAutomaticallyFromInline;
 }

ios/RCTWebRTC/RTCVideoViewManager.m

@@ -197,10 +197,16 @@ - (void)API_AVAILABLE(ios(15.0))setPIPOptions:(NSDictionary *)pipOptions {
         _pipController.videoTrack = _videoTrack;
     }
 
+    CGFloat blurIntensity = 0;
+    if ([pipOptions objectForKey:@"blurIntensity"]) {
+        blurIntensity = [pipOptions[@"blurIntensity"] doubleValue];
+    }
+
     _pipController.startAutomatically = startAutomatically;
     _pipController.stopAutomatically = stopAutomatically;
     _pipController.objectFit = _objectFit;
     _pipController.preferredSize = preferredSize;
+    _pipController.blurIntensity = blurIntensity;
 }
 
 - (void)API_AVAILABLE(ios(15.0))startPIP {

ios/RCTWebRTC/SampleBufferVideoCallView.h

@@ -7,6 +7,7 @@
 
 @property(nonnull, nonatomic, readonly) AVSampleBufferDisplayLayer *sampleBufferLayer;
 @property(nonatomic, assign) BOOL shouldRender;
+@property(nonatomic, assign) CGFloat blurIntensity;
 
 - (void)requestScaleRecalculation;
 @end

ios/RCTWebRTC/SampleBufferVideoCallView.m

@@ -20,6 +20,7 @@ @interface SampleBufferVideoCallView ()
 @property(nonatomic, retain) I420Converter *i420Converter;
 @property(nonatomic, strong) id<SampleBufferRendering> renderer;
 @property(nonatomic, assign) NSInteger currentRotation;
+@property(nonatomic, strong) UIVisualEffectView *blurEffectView;
 
 @end
 
@@ -171,6 +172,32 @@ - (CVPixelBufferRef)pixelBufferFromI420:(RTCI420Buffer *)i420Buffer {
     return convertedPixelBuffer;
 }
 
+- (void)setBlurIntensity:(CGFloat)blurIntensity {
+    blurIntensity = MAX(0.0, MIN(1.0, blurIntensity));
+    if (_blurIntensity == blurIntensity) {
+        return;
+    }
+    _blurIntensity = blurIntensity;
+
+    dispatch_async(dispatch_get_main_queue(), ^{
+        if (blurIntensity > 0) {
+            if (!self.blurEffectView) {
+                UIBlurEffect *effect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleLight];
+                self.blurEffectView = [[UIVisualEffectView alloc] initWithEffect:effect];
+                self.blurEffectView.autoresizingMask =
+                    UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
+            }
+            self.blurEffectView.frame = self.bounds;
+            self.blurEffectView.alpha = blurIntensity;
+            if (!self.blurEffectView.superview) {
+                [self addSubview:self.blurEffectView];
+            }
+        } else {
+            [self.blurEffectView removeFromSuperview];
+        }
+    });
+}
+
 - (void)dealloc {
     [_i420Converter unprepareForAccelerateConversion];
 }