update

Pods/Kingfisher/Sources/General/ImageSource/AVAssetImageDataProvider.swift

@@ -0,0 +1,148 @@
+//
+//  AVAssetImageDataProvider.swift
+//  Kingfisher
+//
+//  Created by onevcat on 2020/08/09.
+//
+//  Copyright (c) 2020 Wei Wang <onevcat@gmail.com>
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+
+#if !os(watchOS)
+
+import Foundation
+import AVKit
+
+#if canImport(MobileCoreServices)
+import MobileCoreServices
+#else
+import CoreServices
+#endif
+
+/// A data provider to provide thumbnail data from a given AVKit asset.
+public struct AVAssetImageDataProvider: ImageDataProvider {
+
+    /// The possible error might be caused by the `AVAssetImageDataProvider`.
+    /// - userCancelled: The data provider process is cancelled.
+    /// - invalidImage: The retrieved image is invalid.
+    public enum AVAssetImageDataProviderError: Error {
+        case userCancelled
+        case invalidImage(_ image: CGImage?)
+    }
+
+    /// The asset image generator bound to `self`.
+    public let assetImageGenerator: AVAssetImageGenerator
+
+    /// The time at which the image should be generate in the asset.
+    public let time: CMTime
+
+    private var internalKey: String {
+        return (assetImageGenerator.asset as? AVURLAsset)?.url.absoluteString ?? UUID().uuidString
+    }
+
+    /// The cache key used by `self`.
+    public var cacheKey: String {
+        return "\(internalKey)_\(time.seconds)"
+    }
+
+    /// Creates an asset image data provider.
+    /// - Parameters:
+    ///   - assetImageGenerator: The asset image generator controls data providing behaviors.
+    ///   - time: At which time in the asset the image should be generated.
+    public init(assetImageGenerator: AVAssetImageGenerator, time: CMTime) {
+        self.assetImageGenerator = assetImageGenerator
+        self.time = time
+    }
+
+    /// Creates an asset image data provider.
+    /// - Parameters:
+    ///   - assetURL: The URL of asset for providing image data.
+    ///   - time: At which time in the asset the image should be generated.
+    ///
+    /// This method uses `assetURL` to create an `AVAssetImageGenerator` object and calls
+    /// the `init(assetImageGenerator:time:)` initializer.
+    ///
+    public init(assetURL: URL, time: CMTime) {
+        let asset = AVAsset(url: assetURL)
+        let generator = AVAssetImageGenerator(asset: asset)
+        generator.appliesPreferredTrackTransform = true
+        self.init(assetImageGenerator: generator, time: time)
+    }
+
+    /// Creates an asset image data provider.
+    ///
+    /// - Parameters:
+    ///   - assetURL: The URL of asset for providing image data.
+    ///   - seconds: At which time in seconds in the asset the image should be generated.
+    ///
+    /// This method uses `assetURL` to create an `AVAssetImageGenerator` object, uses `seconds` to create a `CMTime`,
+    /// and calls the `init(assetImageGenerator:time:)` initializer.
+    ///
+    public init(assetURL: URL, seconds: TimeInterval) {
+        let time = CMTime(seconds: seconds, preferredTimescale: 600)
+        self.init(assetURL: assetURL, time: time)
+    }
+
+    public func data(handler: @escaping (Result<Data, Error>) -> Void) {
+        assetImageGenerator.generateCGImagesAsynchronously(forTimes: [NSValue(time: time)]) {
+            (requestedTime, image, imageTime, result, error) in
+            if let error = error {
+                handler(.failure(error))
+                return
+            }
+
+            if result == .cancelled {
+                handler(.failure(AVAssetImageDataProviderError.userCancelled))
+                return
+            }
+
+            guard let cgImage = image, let data = cgImage.jpegData else {
+                handler(.failure(AVAssetImageDataProviderError.invalidImage(image)))
+                return
+            }
+
+            handler(.success(data))
+        }
+    }
+}
+
+extension CGImage {
+    var jpegData: Data? {
+        guard let mutableData = CFDataCreateMutable(nil, 0) else {
+            return nil
+        }
+#if os(xrOS)
+        guard let destination = CGImageDestinationCreateWithData(
+            mutableData, UTType.jpeg.identifier as CFString , 1, nil
+        ) else {
+            return nil
+        }
+#else
+        guard let destination = CGImageDestinationCreateWithData(mutableData, kUTTypeJPEG, 1, nil) else {
+            return nil
+        }
+#endif
+        
+        CGImageDestinationAddImage(destination, self, nil)
+        guard CGImageDestinationFinalize(destination) else { return nil }
+        return mutableData as Data
+    }
+}
+
+#endif