├── FrameExtraction.xcodeproj
    ├── project.pbxproj
    ├── project.xcworkspace
    │   └── contents.xcworkspacedata
    └── xcuserdata
    │   └── Bobo.xcuserdatad
    │       ├── xcdebugger
    │           └── Breakpoints_v2.xcbkptlist
    │       └── xcschemes
    │           ├── FrameExtraction.xcscheme
    │           └── xcschememanagement.plist
├── FrameExtraction
    ├── AppDelegate.swift
    ├── Assets.xcassets
    │   └── AppIcon.appiconset
    │   │   └── Contents.json
    ├── Base.lproj
    │   ├── LaunchScreen.storyboard
    │   └── Main.storyboard
    ├── FrameExtractor.swift
    ├── Info.plist
    └── ViewController.swift
├── Inside Serial Queue (ci - cg - ui - global context).png
├── Inside Serial Queue (ci - cg - ui).png
├── Inside serial queue - UIImage(ciImage).png
└── Outside serial queue (ci - cg - ui).png


/FrameExtraction.xcodeproj/project.pbxproj:
--------------------------------------------------------------------------------
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 66 | 			);
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 80 | 			);
 81 | 			buildRules = (
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 83 | 			dependencies = (
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102 | 						DevelopmentTeam = WEQK56686X;
103 | 						ProvisioningStyle = Automatic;
104 | 					};
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106 | 			};
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110 | 			hasScannedForEncodings = 0;
111 | 			knownRegions = (
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113 | 				Base,
114 | 			);
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116 | 			productRefGroup = C3E867731E1488470042F78A /* Products */;
117 | 			projectDirPath = "";
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120 | 				C3E867711E1488470042F78A /* FrameExtraction */,
121 | 			);
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315 | 


--------------------------------------------------------------------------------
/FrameExtraction.xcodeproj/project.xcworkspace/contents.xcworkspacedata:
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2 | <Workspace
3 |    version = "1.0">
4 |    <FileRef
5 |       location = "self:FrameExtraction.xcodeproj">
6 |    </FileRef>
7 | </Workspace>
8 | 


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/FrameExtraction.xcodeproj/xcuserdata/Bobo.xcuserdatad/xcdebugger/Breakpoints_v2.xcbkptlist:
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1 | <?xml version="1.0" encoding="UTF-8"?>
2 | <Bucket
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5 | </Bucket>
6 | 


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/FrameExtraction.xcodeproj/xcuserdata/Bobo.xcuserdatad/xcschemes/xcschememanagement.plist:
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23 | 


--------------------------------------------------------------------------------
/FrameExtraction/AppDelegate.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  AppDelegate.swift
 3 | //  FrameExtraction
 4 | //
 5 | //  Created by Bobo on 29/12/2016.
 6 | //  Copyright © 2016 bRo. All rights reserved.
 7 | //
 8 | 
 9 | import UIKit
10 | 
11 | @UIApplicationMain
12 | class AppDelegate: UIResponder, UIApplicationDelegate {
13 | 
14 |     var window: UIWindow?
15 | 
16 |     func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
17 |         // Override point for customization after application launch.
18 |         return true
19 |     }
20 | 
21 | }
22 | 
23 | 


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/FrameExtraction/Assets.xcassets/AppIcon.appiconset/Contents.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "images" : [
 3 |     {
 4 |       "idiom" : "iphone",
 5 |       "size" : "20x20",
 6 |       "scale" : "2x"
 7 |     },
 8 |     {
 9 |       "idiom" : "iphone",
10 |       "size" : "20x20",
11 |       "scale" : "3x"
12 |     },
13 |     {
14 |       "idiom" : "iphone",
15 |       "size" : "29x29",
16 |       "scale" : "2x"
17 |     },
18 |     {
19 |       "idiom" : "iphone",
20 |       "size" : "29x29",
21 |       "scale" : "3x"
22 |     },
23 |     {
24 |       "idiom" : "iphone",
25 |       "size" : "40x40",
26 |       "scale" : "2x"
27 |     },
28 |     {
29 |       "idiom" : "iphone",
30 |       "size" : "40x40",
31 |       "scale" : "3x"
32 |     },
33 |     {
34 |       "idiom" : "iphone",
35 |       "size" : "60x60",
36 |       "scale" : "2x"
37 |     },
38 |     {
39 |       "idiom" : "iphone",
40 |       "size" : "60x60",
41 |       "scale" : "3x"
42 |     }
43 |   ],
44 |   "info" : {
45 |     "version" : 1,
46 |     "author" : "xcode"
47 |   }
48 | }


--------------------------------------------------------------------------------
/FrameExtraction/Base.lproj/LaunchScreen.storyboard:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 2 | <document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="11134" systemVersion="15F34" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
 3 |     <dependencies>
 4 |         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="11106"/>
 5 |         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
 6 |     </dependencies>
 7 |     <scenes>
 8 |         <!--View Controller-->
 9 |         <scene sceneID="EHf-IW-A2E">
10 |             <objects>
11 |                 <viewController id="01J-lp-oVM" sceneMemberID="viewController">
12 |                     <layoutGuides>
13 |                         <viewControllerLayoutGuide type="top" id="Llm-lL-Icb"/>
14 |                         <viewControllerLayoutGuide type="bottom" id="xb3-aO-Qok"/>
15 |                     </layoutGuides>
16 |                     <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
17 |                         <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
18 |                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
19 |                         <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
20 |                     </view>
21 |                 </viewController>
22 |                 <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
23 |             </objects>
24 |             <point key="canvasLocation" x="53" y="375"/>
25 |         </scene>
26 |     </scenes>
27 | </document>
28 | 


--------------------------------------------------------------------------------
/FrameExtraction/Base.lproj/Main.storyboard:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 2 | <document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="11201" systemVersion="15G1108" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
 3 |     <dependencies>
 4 |         <deployment identifier="iOS"/>
 5 |         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="11161"/>
 6 |         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
 7 |     </dependencies>
 8 |     <scenes>
 9 |         <!--View Controller-->
10 |         <scene sceneID="tne-QT-ifu">
11 |             <objects>
12 |                 <viewController id="BYZ-38-t0r" customClass="ViewController" customModule="FrameExtraction" customModuleProvider="target" sceneMemberID="viewController">
13 |                     <layoutGuides>
14 |                         <viewControllerLayoutGuide type="top" id="y3c-jy-aDJ"/>
15 |                         <viewControllerLayoutGuide type="bottom" id="wfy-db-euE"/>
16 |                     </layoutGuides>
17 |                     <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
18 |                         <rect key="frame" x="0.0" y="0.0" width="320" height="568"/>
19 |                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
20 |                         <subviews>
21 |                             <imageView userInteractionEnabled="NO" contentMode="scaleAspectFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="LKL-Lr-zk7">
22 |                                 <frame key="frameInset" width="320" height="568"/>
23 |                                 <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
24 |                             </imageView>
25 |                             <button opaque="NO" contentMode="scaleToFill" fixedFrame="YES" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="Ajc-e1-l4B">
26 |                                 <frame key="frameInset" minX="112" minY="482" width="96" height="48"/>
27 |                                 <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
28 |                                 <color key="backgroundColor" red="0.30084735159999998" green="0.30396646259999999" blue="0.2998255789" alpha="0.82165857263513509" colorSpace="custom" customColorSpace="sRGB"/>
29 |                                 <fontDescription key="fontDescription" type="boldSystem" pointSize="30"/>
30 |                                 <state key="normal" title="Flip">
31 |                                     <color key="titleColor" red="1" green="0.0" blue="0.0" alpha="1" colorSpace="calibratedRGB"/>
32 |                                 </state>
33 |                                 <userDefinedRuntimeAttributes>
34 |                                     <userDefinedRuntimeAttribute type="number" keyPath="layer.cornerRadius">
35 |                                         <integer key="value" value="24"/>
36 |                                     </userDefinedRuntimeAttribute>
37 |                                 </userDefinedRuntimeAttributes>
38 |                                 <connections>
39 |                                     <action selector="flipButton:" destination="BYZ-38-t0r" eventType="touchUpInside" id="xFD-LI-HuF"/>
40 |                                 </connections>
41 |                             </button>
42 |                         </subviews>
43 |                         <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
44 |                     </view>
45 |                     <connections>
46 |                         <outlet property="imageView" destination="LKL-Lr-zk7" id="T9v-14-b75"/>
47 |                     </connections>
48 |                 </viewController>
49 |                 <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
50 |             </objects>
51 |             <point key="canvasLocation" x="116.25" y="122.53521126760563"/>
52 |         </scene>
53 |     </scenes>
54 | </document>
55 | 


--------------------------------------------------------------------------------
/FrameExtraction/FrameExtractor.swift:
--------------------------------------------------------------------------------
  1 | //
  2 | //  FrameExtractor.swift
  3 | //  Created by Bobo on 29/12/2016.
  4 | //
  5 | 
  6 | import UIKit
  7 | import AVFoundation
  8 | 
  9 | protocol FrameExtractorDelegate: class {
 10 |     func captured(image: UIImage)
 11 | }
 12 | 
 13 | class FrameExtractor: NSObject, AVCaptureVideoDataOutputSampleBufferDelegate {
 14 |     
 15 |     private var position = AVCaptureDevicePosition.back
 16 |     private let quality = AVCaptureSessionPresetMedium
 17 |     
 18 |     private var permissionGranted = false
 19 |     private let sessionQueue = DispatchQueue(label: "session queue")
 20 |     private let captureSession = AVCaptureSession()
 21 |     private let context = CIContext()
 22 |     
 23 |     weak var delegate: FrameExtractorDelegate?
 24 |     
 25 |     override init() {
 26 |         super.init()
 27 |         checkPermission()
 28 |         sessionQueue.async { [unowned self] in
 29 |             self.configureSession()
 30 |             self.captureSession.startRunning()
 31 |         }
 32 |     }
 33 |     
 34 |     public func flipCamera() {
 35 |         sessionQueue.async { [unowned self] in
 36 |             self.captureSession.beginConfiguration()
 37 |             guard let currentCaptureInput = self.captureSession.inputs.first as? AVCaptureInput else { return }
 38 |             self.captureSession.removeInput(currentCaptureInput)
 39 |             guard let currentCaptureOutput = self.captureSession.outputs.first as? AVCaptureOutput else { return }
 40 |             self.captureSession.removeOutput(currentCaptureOutput)
 41 |             self.position = self.position == .front ? .back : .front
 42 |             self.configureSession()
 43 |             self.captureSession.commitConfiguration()
 44 |         }
 45 |     }
 46 |     
 47 |     // MARK: AVSession configuration
 48 |     private func checkPermission() {
 49 |         switch AVCaptureDevice.authorizationStatus(forMediaType: AVMediaTypeVideo) {
 50 |         case .authorized:
 51 |             permissionGranted = true
 52 |         case .notDetermined:
 53 |             requestPermission()
 54 |         default:
 55 |             permissionGranted = false
 56 |         }
 57 |     }
 58 |     
 59 |     private func requestPermission() {
 60 |         sessionQueue.suspend()
 61 |         AVCaptureDevice.requestAccess(forMediaType: AVMediaTypeVideo) { [unowned self] granted in
 62 |             self.permissionGranted = granted
 63 |             self.sessionQueue.resume()
 64 |         }
 65 |     }
 66 |     
 67 |     private func configureSession() {
 68 |         guard permissionGranted else { return }
 69 |         captureSession.sessionPreset = quality
 70 |         guard let captureDevice = selectCaptureDevice() else { return }
 71 |         guard let captureDeviceInput = try? AVCaptureDeviceInput(device: captureDevice) else { return }
 72 |         guard captureSession.canAddInput(captureDeviceInput) else { return }
 73 |         captureSession.addInput(captureDeviceInput)
 74 |         let videoOutput = AVCaptureVideoDataOutput()
 75 |         videoOutput.setSampleBufferDelegate(self, queue: DispatchQueue(label: "sample buffer"))
 76 |         guard captureSession.canAddOutput(videoOutput) else { return }
 77 |         captureSession.addOutput(videoOutput)
 78 |         guard let connection = videoOutput.connection(withMediaType: AVFoundation.AVMediaTypeVideo) else { return }
 79 |         guard connection.isVideoOrientationSupported else { return }
 80 |         guard connection.isVideoMirroringSupported else { return }
 81 |         connection.videoOrientation = .portrait
 82 |         connection.isVideoMirrored = position == .front
 83 |     }
 84 |     
 85 |     private func selectCaptureDevice() -> AVCaptureDevice? {
 86 |         return AVCaptureDevice.devices().filter {
 87 |             ($0 as AnyObject).hasMediaType(AVMediaTypeVideo) &&
 88 |             ($0 as AnyObject).position == position
 89 |         }.first as? AVCaptureDevice
 90 |     }
 91 |     
 92 |     // MARK: Sample buffer to UIImage conversion
 93 |     private func imageFromSampleBuffer(sampleBuffer: CMSampleBuffer) -> UIImage? {
 94 |         guard let imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer) else { return nil }
 95 |         let ciImage = CIImage(cvPixelBuffer: imageBuffer)
 96 |         guard let cgImage = context.createCGImage(ciImage, from: ciImage.extent) else { return nil }
 97 |         return UIImage(cgImage: cgImage)
 98 |     }
 99 |     
100 |     // MARK: AVCaptureVideoDataOutputSampleBufferDelegate
101 |     func captureOutput(_ captureOutput: AVCaptureOutput!, didOutputSampleBuffer sampleBuffer: CMSampleBuffer!, from connection: AVCaptureConnection!) {
102 |         guard let uiImage = imageFromSampleBuffer(sampleBuffer: sampleBuffer) else { return }
103 |         DispatchQueue.main.async { [unowned self] in
104 |             self.delegate?.captured(image: uiImage)
105 |         }
106 |     }
107 | }
108 | 


--------------------------------------------------------------------------------
/FrameExtraction/Info.plist:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 3 | <plist version="1.0">
 4 | <dict>
 5 | 	<key>CFBundleDevelopmentRegion</key>
 6 | 	<string>en</string>
 7 | 	<key>CFBundleExecutable</key>
 8 | 	<string>$(EXECUTABLE_NAME)</string>
 9 | 	<key>CFBundleIdentifier</key>
10 | 	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
11 | 	<key>CFBundleInfoDictionaryVersion</key>
12 | 	<string>6.0</string>
13 | 	<key>CFBundleName</key>
14 | 	<string>$(PRODUCT_NAME)</string>
15 | 	<key>CFBundlePackageType</key>
16 | 	<string>APPL</string>
17 | 	<key>CFBundleShortVersionString</key>
18 | 	<string>1.0</string>
19 | 	<key>CFBundleVersion</key>
20 | 	<string>1</string>
21 | 	<key>LSRequiresIPhoneOS</key>
22 | 	<true/>
23 | 	<key>NSCameraUsageDescription</key>
24 | 	<string>Used to capture frames</string>
25 | 	<key>LSApplicationCategoryType</key>
26 | 	<string></string>
27 | 	<key>UILaunchStoryboardName</key>
28 | 	<string>LaunchScreen</string>
29 | 	<key>UIMainStoryboardFile</key>
30 | 	<string>Main</string>
31 | 	<key>UIRequiredDeviceCapabilities</key>
32 | 	<array>
33 | 		<string>armv7</string>
34 | 	</array>
35 | 	<key>UISupportedInterfaceOrientations</key>
36 | 	<array>
37 | 		<string>UIInterfaceOrientationPortrait</string>
38 | 	</array>
39 | </dict>
40 | </plist>
41 | 


--------------------------------------------------------------------------------
/FrameExtraction/ViewController.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  ViewController.swift
 3 | //  Created by Bobo on 29/12/2016.
 4 | //
 5 | 
 6 | import UIKit
 7 | 
 8 | class ViewController: UIViewController, FrameExtractorDelegate {
 9 |     
10 |     var frameExtractor: FrameExtractor!
11 |     
12 |     @IBOutlet weak var imageView: UIImageView!
13 |     
14 |     @IBAction func flipButton(_ sender: UIButton) {
15 |         frameExtractor.flipCamera()
16 |     }
17 |     
18 |     override func viewDidLoad() {
19 |         super.viewDidLoad()
20 |         frameExtractor = FrameExtractor()
21 |         frameExtractor.delegate = self
22 |     }
23 |     
24 |     func captured(image: UIImage) {
25 |         imageView.image = image
26 |     }
27 |     
28 | }
29 | 
30 | 


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/Inside Serial Queue (ci - cg - ui - global context).png:
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https://raw.githubusercontent.com/b-r-o/FrameExtractor/9e0984fb0b48cce60d073a896efc2b3d7867d996/Inside Serial Queue (ci - cg - ui - global context).png


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/Inside Serial Queue (ci - cg - ui).png:
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https://raw.githubusercontent.com/b-r-o/FrameExtractor/9e0984fb0b48cce60d073a896efc2b3d7867d996/Inside Serial Queue (ci - cg - ui).png


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/Inside serial queue - UIImage(ciImage).png:
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https://raw.githubusercontent.com/b-r-o/FrameExtractor/9e0984fb0b48cce60d073a896efc2b3d7867d996/Inside serial queue - UIImage(ciImage).png


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/Outside serial queue (ci - cg - ui).png:
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https://raw.githubusercontent.com/b-r-o/FrameExtractor/9e0984fb0b48cce60d073a896efc2b3d7867d996/Outside serial queue (ci - cg - ui).png


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