├── LayerVideoCompositor.xcodeproj
    ├── project.pbxproj
    └── project.xcworkspace
    │   └── contents.xcworkspacedata
├── LayerVideoCompositor
    ├── AppDelegate.swift
    ├── Assets.xcassets
    │   └── AppIcon.appiconset
    │   │   └── Contents.json
    ├── Base.lproj
    │   ├── LaunchScreen.storyboard
    │   └── Main.storyboard
    ├── Info.plist
    ├── LayerVideoCompositionInstruction.swift
    ├── LayerVideoCompositor.swift
    ├── ViewController.swift
    └── video.mov
└── README.md


/LayerVideoCompositor.xcodeproj/project.pbxproj:
--------------------------------------------------------------------------------
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 72 | 			);
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 87 | 			buildRules = (
 88 | 			);
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 92 | 			productName = LayerVideoCompositor;
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102 | 				LastSwiftUpdateCheck = 0810;
103 | 				LastUpgradeCheck = 0810;
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110 | 						ProvisioningStyle = Automatic;
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112 | 				};
113 | 			};
114 | 			buildConfigurationList = 7B426AB21DDD559D002E94E7 /* Build configuration list for PBXProject "LayerVideoCompositor" */;
115 | 			compatibilityVersion = "Xcode 3.2";
116 | 			developmentRegion = English;
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275 | 			buildSettings = {
276 | 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
277 | 				CLANG_ENABLE_MODULES = YES;
278 | 				DEVELOPMENT_TEAM = X45WPY5JFZ;
279 | 				INFOPLIST_FILE = LayerVideoCompositor/Info.plist;
280 | 				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
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328 | }
329 | 


--------------------------------------------------------------------------------
/LayerVideoCompositor.xcodeproj/project.xcworkspace/contents.xcworkspacedata:
--------------------------------------------------------------------------------
1 | <?xml version="1.0" encoding="UTF-8"?>
2 | <Workspace
3 |    version = "1.0">
4 |    <FileRef
5 |       location = "self:LayerVideoCompositor.xcodeproj">
6 |    </FileRef>
7 | </Workspace>
8 | 


--------------------------------------------------------------------------------
/LayerVideoCompositor/AppDelegate.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  AppDelegate.swift
 3 | //  LayerVideoCompositor
 4 | //
 5 | //  Created by Sami Samhuri on 2016-11-16.
 6 | //  Copyright © 2016 Guru Logic. All rights reserved.
 7 | //
 8 | 
 9 | import UIKit
10 | 
11 | @UIApplicationMain
12 | class AppDelegate: UIResponder, UIApplicationDelegate {
13 | 
14 |     var window: UIWindow?
15 | 
16 | 
17 |     func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
18 |         // Override point for customization after application launch.
19 |         return true
20 |     }
21 | 
22 |     func applicationWillResignActive(_ application: UIApplication) {
23 |         // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
24 |         // Use this method to pause ongoing tasks, disable timers, and invalidate graphics rendering callbacks. Games should use this method to pause the game.
25 |     }
26 | 
27 |     func applicationDidEnterBackground(_ application: UIApplication) {
28 |         // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
29 |         // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
30 |     }
31 | 
32 |     func applicationWillEnterForeground(_ application: UIApplication) {
33 |         // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
34 |     }
35 | 
36 |     func applicationDidBecomeActive(_ application: UIApplication) {
37 |         // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
38 |     }
39 | 
40 |     func applicationWillTerminate(_ application: UIApplication) {
41 |         // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
42 |     }
43 | 
44 | 
45 | }
46 | 
47 | 


--------------------------------------------------------------------------------
/LayerVideoCompositor/Assets.xcassets/AppIcon.appiconset/Contents.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "images" : [
 3 |     {
 4 |       "idiom" : "iphone",
 5 |       "size" : "29x29",
 6 |       "scale" : "2x"
 7 |     },
 8 |     {
 9 |       "idiom" : "iphone",
10 |       "size" : "29x29",
11 |       "scale" : "3x"
12 |     },
13 |     {
14 |       "idiom" : "iphone",
15 |       "size" : "40x40",
16 |       "scale" : "2x"
17 |     },
18 |     {
19 |       "idiom" : "iphone",
20 |       "size" : "40x40",
21 |       "scale" : "3x"
22 |     },
23 |     {
24 |       "idiom" : "iphone",
25 |       "size" : "60x60",
26 |       "scale" : "2x"
27 |     },
28 |     {
29 |       "idiom" : "iphone",
30 |       "size" : "60x60",
31 |       "scale" : "3x"
32 |     },
33 |     {
34 |       "idiom" : "ipad",
35 |       "size" : "29x29",
36 |       "scale" : "1x"
37 |     },
38 |     {
39 |       "idiom" : "ipad",
40 |       "size" : "29x29",
41 |       "scale" : "2x"
42 |     },
43 |     {
44 |       "idiom" : "ipad",
45 |       "size" : "40x40",
46 |       "scale" : "1x"
47 |     },
48 |     {
49 |       "idiom" : "ipad",
50 |       "size" : "40x40",
51 |       "scale" : "2x"
52 |     },
53 |     {
54 |       "idiom" : "ipad",
55 |       "size" : "76x76",
56 |       "scale" : "1x"
57 |     },
58 |     {
59 |       "idiom" : "ipad",
60 |       "size" : "76x76",
61 |       "scale" : "2x"
62 |     }
63 |   ],
64 |   "info" : {
65 |     "version" : 1,
66 |     "author" : "xcode"
67 |   }
68 | }


--------------------------------------------------------------------------------
/LayerVideoCompositor/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 | 


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/LayerVideoCompositor/Base.lproj/Main.storyboard:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="11542" systemVersion="16B2555" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
 3 |     <device id="retina4_7" orientation="portrait">
 4 |         <adaptation id="fullscreen"/>
 5 |     </device>
 6 |     <dependencies>
 7 |         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="11524"/>
 8 |         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
 9 |     </dependencies>
10 |     <scenes>
11 |         <!--View Controller-->
12 |         <scene sceneID="tne-QT-ifu">
13 |             <objects>
14 |                 <viewController id="BYZ-38-t0r" customClass="ViewController" customModule="LayerVideoCompositor" customModuleProvider="target" sceneMemberID="viewController">
15 |                     <layoutGuides>
16 |                         <viewControllerLayoutGuide type="top" id="y3c-jy-aDJ"/>
17 |                         <viewControllerLayoutGuide type="bottom" id="wfy-db-euE"/>
18 |                     </layoutGuides>
19 |                     <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
20 |                         <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
21 |                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
22 |                         <subviews>
23 |                             <activityIndicatorView opaque="NO" contentMode="scaleToFill" horizontalHuggingPriority="750" verticalHuggingPriority="750" hidesWhenStopped="YES" animating="YES" style="whiteLarge" translatesAutoresizingMaskIntoConstraints="NO" id="gMZ-I5-gYe">
24 |                                 <rect key="frame" x="169" y="315" width="37" height="37"/>
25 |                             </activityIndicatorView>
26 |                             <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Rendering video" textAlignment="center" lineBreakMode="wordWrap" numberOfLines="0" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="xce-mO-TBx">
27 |                                 <rect key="frame" x="10" y="286" width="355" height="21"/>
28 |                                 <fontDescription key="fontDescription" type="system" pointSize="17"/>
29 |                                 <color key="textColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
30 |                                 <nil key="highlightedColor"/>
31 |                             </label>
32 |                         </subviews>
33 |                         <color key="backgroundColor" red="0.20000000000000001" green="0.20000000000000001" blue="0.20000000000000001" alpha="0.85090648849999995" colorSpace="calibratedRGB"/>
34 |                         <constraints>
35 |                             <constraint firstItem="gMZ-I5-gYe" firstAttribute="top" secondItem="xce-mO-TBx" secondAttribute="bottom" constant="8" id="BnQ-UY-9C3"/>
36 |                             <constraint firstItem="xce-mO-TBx" firstAttribute="centerX" secondItem="gMZ-I5-gYe" secondAttribute="centerX" id="HTV-8x-I5q"/>
37 |                             <constraint firstItem="xce-mO-TBx" firstAttribute="width" secondItem="8bC-Xf-vdC" secondAttribute="width" constant="-20" id="OzH-Sr-3uc"/>
38 |                             <constraint firstItem="gMZ-I5-gYe" firstAttribute="centerX" secondItem="8bC-Xf-vdC" secondAttribute="centerX" id="c3e-hH-pRE"/>
39 |                             <constraint firstItem="gMZ-I5-gYe" firstAttribute="centerY" secondItem="8bC-Xf-vdC" secondAttribute="centerY" id="nKh-xD-zV1"/>
40 |                         </constraints>
41 |                     </view>
42 |                     <connections>
43 |                         <outlet property="indicator" destination="gMZ-I5-gYe" id="pya-LZ-csF"/>
44 |                         <outlet property="label" destination="xce-mO-TBx" id="8ka-Tc-7Am"/>
45 |                     </connections>
46 |                 </viewController>
47 |                 <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
48 |             </objects>
49 |         </scene>
50 |     </scenes>
51 | </document>
52 | 


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/LayerVideoCompositor/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>UILaunchStoryboardName</key>
24 | 	<string>LaunchScreen</string>
25 | 	<key>UIMainStoryboardFile</key>
26 | 	<string>Main</string>
27 | 	<key>UIRequiredDeviceCapabilities</key>
28 | 	<array>
29 | 		<string>armv7</string>
30 | 	</array>
31 | 	<key>UISupportedInterfaceOrientations</key>
32 | 	<array>
33 | 		<string>UIInterfaceOrientationPortrait</string>
34 | 		<string>UIInterfaceOrientationLandscapeLeft</string>
35 | 		<string>UIInterfaceOrientationLandscapeRight</string>
36 | 	</array>
37 | 	<key>UISupportedInterfaceOrientations~ipad</key>
38 | 	<array>
39 | 		<string>UIInterfaceOrientationPortrait</string>
40 | 		<string>UIInterfaceOrientationPortraitUpsideDown</string>
41 | 		<string>UIInterfaceOrientationLandscapeLeft</string>
42 | 		<string>UIInterfaceOrientationLandscapeRight</string>
43 | 	</array>
44 | </dict>
45 | </plist>
46 | 


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/LayerVideoCompositor/LayerVideoCompositionInstruction.swift:
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 1 | //
 2 | //  LayerVideoCompositionInstruction.swift
 3 | //  LayerVideoCompositor
 4 | //
 5 | //  Created by Sami Samhuri on 2016-09-05.
 6 | //  Copyright © 2016 Guru Logic Inc. All rights reserved.
 7 | //
 8 | 
 9 | import Foundation
10 | import AVFoundation
11 | 
12 | final class LayerVideoCompositionInstruction: NSObject, AVVideoCompositionInstructionProtocol {
13 |     // Fixed
14 |     let enablePostProcessing: Bool = true
15 |     let containsTweening: Bool = false
16 |     let passthroughTrackID: CMPersistentTrackID = kCMPersistentTrackID_Invalid
17 | 
18 |     // Variable
19 |     let timeRange: CMTimeRange
20 |     let requiredSourceTrackIDs: [NSValue]?
21 |     let videoTrackID: CMPersistentTrackID
22 |     let targetSize: CGSize
23 |     let transform: CGAffineTransform
24 |     let overlayLayer: CALayer?
25 | 
26 |     init(track: AVAssetTrack, timeRange: CMTimeRange, overlayLayer: CALayer?, transform: CGAffineTransform, targetSize: CGSize) {
27 |         assert(overlayLayer == nil || overlayLayer!.bounds.size == targetSize)
28 |         self.requiredSourceTrackIDs = [NSNumber(value: track.trackID)]
29 |         self.timeRange = timeRange
30 |         self.videoTrackID = track.trackID
31 |         self.transform = transform
32 |         self.targetSize = targetSize
33 |         self.overlayLayer = overlayLayer
34 |         super.init()
35 |     }
36 | }
37 | 


--------------------------------------------------------------------------------
/LayerVideoCompositor/LayerVideoCompositor.swift:
--------------------------------------------------------------------------------
  1 | //
  2 | //  LayerVideoCompositor.swift
  3 | //  LayerVideoCompositor
  4 | //
  5 | //  Created by Sami Samhuri on 2016-09-05.
  6 | //  Copyright © 2016 Guru Logic Inc. All rights reserved.
  7 | //
  8 | 
  9 | import Foundation
 10 | import Dispatch
 11 | import AVFoundation
 12 | import CoreImage
 13 | 
 14 | enum LayerVideoCompositingError: Error {
 15 |     case invalidRequest
 16 |     case sourceFrameBuffer
 17 |     case overlayTextLayer
 18 | }
 19 | 
 20 | final class LayerVideoCompositor: NSObject, AVVideoCompositing {
 21 |     private let queue = DispatchQueue(label: "ca.gurulogic.layer-video-compositor.render", qos: .default)
 22 |     private var renderContext: AVVideoCompositionRenderContext = AVVideoCompositionRenderContext()
 23 |     private var cancelled: Bool = false
 24 |     private let ciContext: CIContext = {
 25 |         if let eaglContext = EAGLContext(api: .openGLES3) ?? EAGLContext(api: .openGLES2) {
 26 |             return CIContext(eaglContext: eaglContext)
 27 |         }
 28 |         return CIContext()
 29 |     }()
 30 |     private var cachedOverlaySnapshot: CGImage?
 31 |     private let colorSpace = CGColorSpaceCreateDeviceRGB()
 32 | 
 33 |     var supportsWideColorSourceFrames: Bool {
 34 |         return false
 35 |     }
 36 | 
 37 |     private static let pixelFormat = kCVPixelFormatType_32BGRA
 38 | 
 39 |     let sourcePixelBufferAttributes: [String : Any]? = [
 40 |         kCVPixelBufferPixelFormatTypeKey as String : NSNumber(value: LayerVideoCompositor.pixelFormat),
 41 |         kCVPixelBufferOpenGLESCompatibilityKey as String : NSNumber(value: true),
 42 |     ]
 43 | 
 44 |     let requiredPixelBufferAttributesForRenderContext: [String : Any] = [
 45 |         kCVPixelBufferPixelFormatTypeKey as String : NSNumber(value: LayerVideoCompositor.pixelFormat),
 46 |         kCVPixelBufferOpenGLESCompatibilityKey as String : NSNumber(value: true),
 47 |     ]
 48 | 
 49 |     func renderContextChanged(_ newRenderContext: AVVideoCompositionRenderContext) {
 50 |         renderContext = newRenderContext
 51 |     }
 52 | 
 53 |     func startRequest(_ request: AVAsynchronousVideoCompositionRequest) {
 54 |         queue.async {
 55 |             guard !self.cancelled else {
 56 |                 request.finishCancelledRequest()
 57 |                 return
 58 |             }
 59 | 
 60 |             do {
 61 |                 let renderedBuffer = try self.renderFrame(forRequest: request)
 62 |                 request.finish(withComposedVideoFrame: renderedBuffer)
 63 |             }
 64 |             catch {
 65 |                 request.finish(with: error)
 66 |             }
 67 |         }
 68 |     }
 69 | 
 70 |     func cancelAllPendingVideoCompositionRequests() {
 71 |         cancelled = true
 72 |         queue.async(flags: .barrier) {
 73 |             self.cancelled = false
 74 |         }
 75 |     }
 76 | 
 77 |     private func overlaySnapshot(layer: CALayer) throws -> CGImage {
 78 |         if let cachedSnapshot = cachedOverlaySnapshot {
 79 |             return cachedSnapshot
 80 |         }
 81 |         layer.isGeometryFlipped = true
 82 |         let size = layer.bounds.size
 83 |         let w = Int(size.width)
 84 |         let h = Int(size.height)
 85 |         guard let context = CGContext(data: nil, width: w, height: h, bitsPerComponent: 8, bytesPerRow: 4 * w, space: colorSpace, bitmapInfo: CGImageAlphaInfo.premultipliedLast.rawValue) else { throw NSError() }
 86 |         layer.render(in: context)
 87 |         guard let snapshot = context.makeImage() else { throw NSError() }
 88 |         cachedOverlaySnapshot = snapshot
 89 |         return snapshot
 90 |     }
 91 | 
 92 |     private func renderFrame(forRequest request: AVAsynchronousVideoCompositionRequest) throws -> CVPixelBuffer {
 93 |         return try autoreleasepool {
 94 |             guard let instruction = request.videoCompositionInstruction as? LayerVideoCompositionInstruction else {
 95 |                 throw LayerVideoCompositingError.invalidRequest
 96 |             }
 97 |             guard let videoFrameBuffer = request.sourceFrame(byTrackID: instruction.videoTrackID) else {
 98 |                 // Try to be resilient in the face of errors. If we can't even generate a blank frame then fail.
 99 |                 if let blankBuffer = renderContext.newPixelBuffer() {
100 |                     return blankBuffer
101 |                 }
102 |                 else {
103 |                     throw LayerVideoCompositingError.sourceFrameBuffer
104 |                 }
105 |             }
106 |             let frameImage = CIImage(cvPixelBuffer: videoFrameBuffer).applying(instruction.transform)
107 |             guard let layer = instruction.overlayLayer, let overlayImage = try? CIImage(cgImage: overlaySnapshot(layer: layer)),
108 |                 let composeFilter = CIFilter(name: "CISourceAtopCompositing") else {
109 |                     throw LayerVideoCompositingError.overlayTextLayer
110 |             }
111 |             composeFilter.setValue(frameImage, forKey: kCIInputBackgroundImageKey)
112 |             composeFilter.setValue(overlayImage, forKey: kCIInputImageKey)
113 |             guard let outputImage = composeFilter.outputImage,
114 |                 let renderedBuffer = renderContext.newPixelBuffer() else {
115 |                 throw LayerVideoCompositingError.overlayTextLayer
116 |             }
117 |             ciContext.render(outputImage, to: renderedBuffer, bounds: outputImage.extent, colorSpace: self.colorSpace)
118 |             return renderedBuffer
119 |         }
120 |     }
121 | }
122 | 
123 | 


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/LayerVideoCompositor/ViewController.swift:
--------------------------------------------------------------------------------
  1 | //
  2 | //  ViewController.swift
  3 | //  LayerVideoCompositor
  4 | //
  5 | //  Created by Sami Samhuri on 2016-11-16.
  6 | //  Copyright © 2016 Guru Logic. All rights reserved.
  7 | //
  8 | 
  9 | import UIKit
 10 | import AVFoundation
 11 | 
 12 | class ViewController: UIViewController {
 13 |     @IBOutlet private var label: UILabel?
 14 |     @IBOutlet private var indicator: UIActivityIndicatorView?
 15 | 
 16 |     override func viewDidLoad() {
 17 |         super.viewDidLoad()
 18 |         let path = Bundle.main.path(forResource: "video.mov", ofType: nil)
 19 |         let url = URL(fileURLWithPath: path!)
 20 |         let start = Date()
 21 |         overlayTextOnVideo(videoURL: url) { maybeURL in
 22 |             DispatchQueue.main.async {
 23 |                 self.indicator?.stopAnimating()
 24 |                 guard let url = maybeURL else {
 25 |                     self.label?.text = "Error. See console for details."
 26 |                     return
 27 |                 }
 28 | 
 29 |                 let end = Date()
 30 |                 let duration = end.timeIntervalSince1970 - start.timeIntervalSince1970
 31 |                 print("Exported in \(duration) seconds.")
 32 | 
 33 |                 self.label?.text = "Done. Video is in the Documents folder which you can access with iTunes, or an app like iMazing or iExplorer."
 34 |                 let player = AVPlayer(url: url)
 35 |                 let layer = AVPlayerLayer(player: player)
 36 |                 let y = 16 + (self.label?.frame.maxY ?? 0)
 37 |                 let width = self.view.bounds.width
 38 |                 layer.frame = CGRect(x: 0, y: y, width: width, height: 9 / 16 * width)
 39 |                 self.view.layer.addSublayer(layer)
 40 |                 player.play()
 41 |             }
 42 |         }
 43 |     }
 44 | 
 45 |     private func newOverlayLayer(size: CGSize, text: String) -> CALayer {
 46 |         let margin: CGFloat = 16
 47 |         let textHeight: CGFloat = 120
 48 |         let textLayer = CATextLayer()
 49 |         textLayer.alignmentMode = kCAAlignmentCenter
 50 |         textLayer.fontSize = 96
 51 |         textLayer.frame = CGRect(x: margin, y: margin, width: size.width - 2 * margin, height: textHeight)
 52 |         textLayer.string = text
 53 |         textLayer.foregroundColor = UIColor(white: 1, alpha: 0.7).cgColor
 54 |         textLayer.shadowColor = UIColor.black.cgColor
 55 |         textLayer.shadowOpacity = 0.8
 56 | 
 57 |         let overlayLayer = CALayer()
 58 |         overlayLayer.frame = CGRect(origin: .zero, size: size)
 59 |         overlayLayer.addSublayer(textLayer)
 60 | 
 61 |         return overlayLayer
 62 |     }
 63 | 
 64 |     private func overlayTextOnVideo(videoURL: URL, completion: @escaping (URL?) -> Void) {
 65 |         let asset = AVURLAsset(url: videoURL)
 66 |         let videoTracks = asset.tracks(withMediaType: AVMediaTypeVideo)
 67 |         guard let sourceVideoTrack = videoTracks.first else {
 68 |             print("error: asset has no video tracks")
 69 |             completion(nil)
 70 |             return
 71 |         }
 72 |         let timeRange = CMTimeRange(start: kCMTimeZero, duration: asset.duration)
 73 |         let videoComposition = AVMutableVideoComposition(propertiesOf: asset)
 74 |         videoComposition.customVideoCompositorClass = LayerVideoCompositor.self
 75 |         let overlayLayer = newOverlayLayer(size: sourceVideoTrack.naturalSize, text: "Layeriffic!")
 76 |         let instruction = LayerVideoCompositionInstruction(track: sourceVideoTrack, timeRange: timeRange, overlayLayer: overlayLayer, transform: sourceVideoTrack.preferredTransform, targetSize: sourceVideoTrack.naturalSize)
 77 |         videoComposition.instructions = [instruction]
 78 | 
 79 |         let documentDir = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first!
 80 |         let path = documentDir.appending("/export.mov")
 81 |         let outputURL = URL(fileURLWithPath: path)
 82 |         _ = try? FileManager.default.removeItem(at: outputURL)
 83 | 
 84 |         guard let presetName = AVAssetExportSession.exportPresets(compatibleWith: asset).first,
 85 |             let exportSession = AVAssetExportSession(asset: asset, presetName: presetName) else {
 86 |                 print("failed to create asset export session")
 87 |                 completion(nil)
 88 |                 return
 89 |         }
 90 |         exportSession.videoComposition = videoComposition
 91 |         exportSession.outputFileType = AVFileTypeMPEG4
 92 |         exportSession.outputURL = outputURL
 93 |         exportSession.exportAsynchronously {
 94 |             guard exportSession.status == .completed else {
 95 |                 print("export failed: \(exportSession.error)")
 96 |                 completion(nil)
 97 |                 return
 98 |             }
 99 |             completion(outputURL)
100 |         }
101 |     }
102 | }
103 | 
104 | 


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/LayerVideoCompositor/video.mov:
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https://raw.githubusercontent.com/samsonjs/LayerVideoCompositor/e0826027ca6cafcf02659395d8caf3749d756ec7/LayerVideoCompositor/video.mov


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/README.md:
--------------------------------------------------------------------------------
 1 | # LayerVideoCompositor
 2 | 
 3 | An example of using a custom video compositor to overlay a layer on a video.
 4 | 
 5 | This may be useful in working around [radar 28553945](http://www.openradar.me/28553945) as described in [this StackOverflow question](http://stackoverflow.com/questions/39760147/ios-10-avplayerlayer-doesnt-show-video-after-using-avvideocompositioncoreanima).
 6 | 
 7 | This was extracted from [1 Second Everyday](http://1se.co) so if this was useful you should check out our app :)
 8 | 
 9 | # License
10 | 
11 | [MIT License](https://sjs.mit-license.org)
12 | 


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