feat: add filters and change function

Author: tkmn0

SimpleWebRTC/CameraFilter/CameraFilter.swift

@@ -10,29 +10,41 @@ import Foundation
 import AVFoundation
 import CoreImage
 
+enum FilterType: Int{
+    case None
+    case Sepia
+    case Monochrome
+    case ColorControls
+    
+    mutating func next() -> FilterType{
+        return FilterType(rawValue: rawValue + 1) ?? FilterType(rawValue: 0)!
+    }
+}
+
 class CameraFilter {
 
-    private let filter: CIFilter
+    private var filter: CIFilter
     private let context: CIContext
+    var filterType: FilterType = FilterType.None
 
     init() {
-        self.filter = CIFilter(name: "CISepiaTone")!
+        self.filter = CIFilter()
         self.context = CIContext()
     }
 
     func apply(_ sampleBuffer: CVPixelBuffer) -> CVPixelBuffer?{
-        let ciimage = CIImage(cvPixelBuffer: sampleBuffer)
-        self.filter.setValue(ciimage, forKey: kCIInputImageKey)
-        self.filter.setValue(0.8, forKey: "inputIntensity")
+        if self.filterType == .None{ return sampleBuffer }
 
+        let ciimage = CIImage(cvPixelBuffer: sampleBuffer)
         let size: CGSize = ciimage.extent.size
+        self.filter.setValue(ciimage, forKey: kCIInputImageKey)
 
         let filtered = self.filter.outputImage
         var pixelBuffer: CVPixelBuffer? = nil
 
         let options = [
-            kCVPixelBufferCGImageCompatibilityKey as String: kCFBooleanTrue,
-            kCVPixelBufferCGBitmapContextCompatibilityKey as String: kCFBooleanTrue
+            kCVPixelBufferCGImageCompatibilityKey as String: kCFBooleanTrue as Any,
+            kCVPixelBufferCGBitmapContextCompatibilityKey as String: kCFBooleanTrue as Any
             ] as [String : Any]
 
         let status: CVReturn = CVPixelBufferCreate(kCFAllocatorDefault,
@@ -47,4 +59,24 @@ class CameraFilter {
         }
         return pixelBuffer
     }
+    
+    func changeFilter(_ filterType: FilterType){
+        switch filterType {
+        case .Sepia:
+            self.filter = CIFilter(name: "CISepiaTone")!
+            self.filter.setValue(0.8, forKey: "inputIntensity")
+        case .Monochrome:
+            self.filter = CIFilter(name: "CIColorMonochrome")!
+            self.filter.setValue(CIColor(red: 0.75, green: 0.75, blue: 0.75), forKey: "inputColor")
+            self.filter.setValue(1.0, forKey: "inputIntensity")
+        case .ColorControls:
+            self.filter = CIFilter(name: "CIColorControls" )!
+            self.filter.setValue(1.0, forKey: "inputSaturation")
+            self.filter.setValue(0.5, forKey: "inputBrightness")
+            self.filter.setValue(3.0, forKey: "inputContrast")
+        case .None:
+            break
+        }
+        self.filterType = filterType
+    }
 }

SimpleWebRTC/ViewController/ViewController.swift

@@ -107,8 +107,14 @@ class ViewController: UIViewController, WebSocketDelegate, WebRTCClientDelegate,
         let localVideoView = webRTCClient.localVideoView()
         webRTCClient.setupLocalViewFrame(frame: CGRect(x: 0, y: 0, width: ScreenSizeUtil.width()/3, height: ScreenSizeUtil.height()/3))
         localVideoView.center.y = self.view.center.y
+        localVideoView.subviews.last?.isUserInteractionEnabled = true
         self.view.addSubview(localVideoView)
 
+        let localVideoViewButton = UIButton(frame: CGRect(x: 0, y: 0, width: localVideoView.frame.width, height: localVideoView.frame.height))
+        localVideoViewButton.backgroundColor = UIColor.clear
+        localVideoViewButton.addTarget(self, action: #selector(self.localVideoViewTapped(_:)), for: .touchUpInside)
+        localVideoView.addSubview(localVideoViewButton)
+        
         let likeButton = UIButton(frame: CGRect(x: remoteVideoViewContainter.right - 50, y: remoteVideoViewContainter.bottom - 50, width: 40, height: 40))
         likeButton.backgroundColor = UIColor.clear
         likeButton.addTarget(self, action: #selector(self.likeButtonTapped(_:)), for: .touchUpInside)
@@ -191,6 +197,13 @@ class ViewController: UIViewController, WebSocketDelegate, WebRTCClientDelegate,
     @objc func likeButtonTapped(_ sender: UIButton){
         let data = likeStr.data(using: String.Encoding.utf8)
         webRTCClient.sendData(data: data!)
+        self.cameraFilter?.changeFilter((cameraFilter?.filterType.next())!)
+    }
+    
+    @objc func localVideoViewTapped(_ sender: UITapGestureRecognizer) {
+        if let filter = self.cameraFilter {
+            filter.changeFilter(filter.filterType.next())
+        }
     }
 
     private func startLikeAnimation(){

SimpleWebRTC/WebRTC/WebRTCClient.swift

@@ -470,7 +470,7 @@ extension WebRTCClient{
         }
 
         if(isLandScape){
-            let ratio = size.width/size.height
+            let ratio = size.width / size.height
             _renderView.frame = CGRect(x: 0, y: 0, width: _parentView.frame.height * ratio, height: _parentView.frame.height)
             _renderView.center.x = _parentView.frame.width/2
         }else{