Use proportional width/height if only 1 specified, default to 2x if

neither specified
closes #3

Author: finnvoor

…eddata/xcschemes/MetalFXUpscale.xcscheme …shareddata/xcschemes/fx-upscale.xcscheme.swiftpm/xcode/xcshareddata/xcschemes/MetalFXUpscale.xcscheme renamed to .swiftpm/xcode/xcshareddata/xcschemes/fx-upscale.xcscheme .swiftpm/xcode/xcshareddata/xcschemes/MetalFXUpscale.xcscheme renamed to .swiftpm/xcode/xcshareddata/xcschemes/fx-upscale.xcscheme

@@ -14,9 +14,9 @@
             buildForAnalyzing = "YES">
             <BuildableReference
                BuildableIdentifier = "primary"
-               BlueprintIdentifier = "MetalFXUpscale"
-               BuildableName = "MetalFXUpscale"
-               BlueprintName = "MetalFXUpscale"
+               BlueprintIdentifier = "fx-upscale"
+               BuildableName = "fx-upscale"
+               BlueprintName = "fx-upscale"
                ReferencedContainer = "container:">
             </BuildableReference>
          </BuildActionEntry>
@@ -43,9 +43,9 @@
          runnableDebuggingMode = "0">
          <BuildableReference
             BuildableIdentifier = "primary"
-            BlueprintIdentifier = "MetalFXUpscale"
-            BuildableName = "MetalFXUpscale"
-            BlueprintName = "MetalFXUpscale"
+            BlueprintIdentifier = "fx-upscale"
+            BuildableName = "fx-upscale"
+            BlueprintName = "fx-upscale"
             ReferencedContainer = "container:">
          </BuildableReference>
       </BuildableProductRunnable>
@@ -60,9 +60,9 @@
          runnableDebuggingMode = "0">
          <BuildableReference
             BuildableIdentifier = "primary"
-            BlueprintIdentifier = "MetalFXUpscale"
-            BuildableName = "MetalFXUpscale"
-            BlueprintName = "MetalFXUpscale"
+            BlueprintIdentifier = "fx-upscale"
+            BuildableName = "fx-upscale"
+            BlueprintName = "fx-upscale"
             ReferencedContainer = "container:">
          </BuildableReference>
       </BuildableProductRunnable>

README.md

@@ -6,7 +6,7 @@ Metal-powered video upscaling
 
 ## Usage
 ```
-USAGE: fx-upscale <source-file> --width <destination-width> --height <destination-height>
+USAGE: fx-upscale <url> [--width <width>] [--height <height>]
 ```
 
 ## Installation

Sources/FXUpscale.swift

@@ -9,8 +9,8 @@ import SwiftTUI
 @main struct FXUpscale: AsyncParsableCommand {
     @Argument(help: "The video file to upscale", transform: URL.init(fileURLWithPath:)) var url: URL
 
-    @Option(help: "The output file width") var width: Int
-    @Option(help: "The output file height") var height: Int
+    @Option(help: "The output file width") var width: Int?
+    @Option(help: "The output file height") var height: Int?
 
     mutating func run() async throws {
         guard FileManager.default.fileExists(atPath: url.path) else {
@@ -26,16 +26,27 @@ import SwiftTUI
             throw ValidationError("File already exists at \(outputURL.path(percentEncoded: false))")
         }
 
-        guard width <= 7680, height <= 7680 else {
-            throw ValidationError("Maximum supported width/height: 7680")
-        }
-
         let asset = AVAsset(url: url)
         guard let videoTrack = try await asset.loadTracks(withMediaType: .video).first else {
             throw ValidationError("Failed to get video track from input file")
         }
 
         let inputSize = try await videoTrack.load(.naturalSize)
+
+        // 1. Use passed in width/height
+        // 2. Use proportional width/height if only one is specified
+        // 3. Default to 2x upscale
+
+        let width = width ??
+            height.map { Int(inputSize.width * (CGFloat($0) / inputSize.height)) } ??
+            Int(inputSize.width) * 2
+        let height = height ??
+            Int(inputSize.height * (CGFloat(width) / inputSize.width))
+
+        guard width <= 7680, height <= 7680 else {
+            throw ValidationError("Maximum supported width/height: 7680")
+        }
+
         let outputSize = CGSize(width: width, height: height)
 
         let videoComposition = AVMutableVideoComposition()