feat: add visionOS demo project

Demo/Demo-visionOS/Demo-visionOS/Assets.xcassets/AccentColor.colorset/Contents.json

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+{
+  "colors" : [
+    {
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Demo/Demo-visionOS/Demo-visionOS/Assets.xcassets/AppIcon.solidimagestack/Back.solidimagestacklayer/Content.imageset/Contents.json

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+{
+  "images" : [
+    {
+      "idiom" : "vision",
+      "scale" : "2x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Demo/Demo-visionOS/Demo-visionOS/Assets.xcassets/AppIcon.solidimagestack/Back.solidimagestacklayer/Contents.json

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+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Demo/Demo-visionOS/Demo-visionOS/Assets.xcassets/AppIcon.solidimagestack/Contents.json

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+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  },
+  "layers" : [
+    {
+      "filename" : "Front.solidimagestacklayer"
+    },
+    {
+      "filename" : "Middle.solidimagestacklayer"
+    },
+    {
+      "filename" : "Back.solidimagestacklayer"
+    }
+  ]
+}

Demo/Demo-visionOS/Demo-visionOS/Assets.xcassets/AppIcon.solidimagestack/Front.solidimagestacklayer/Content.imageset/Contents.json

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+{
+  "images" : [
+    {
+      "idiom" : "vision",
+      "scale" : "2x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Demo/Demo-visionOS/Demo-visionOS/Assets.xcassets/AppIcon.solidimagestack/Front.solidimagestacklayer/Contents.json

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+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Demo/Demo-visionOS/Demo-visionOS/Assets.xcassets/AppIcon.solidimagestack/Middle.solidimagestacklayer/Content.imageset/Contents.json

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+{
+  "images" : [
+    {
+      "idiom" : "vision",
+      "scale" : "2x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Demo/Demo-visionOS/Demo-visionOS/Assets.xcassets/AppIcon.solidimagestack/Middle.solidimagestacklayer/Contents.json

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+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Demo/Demo-visionOS/Demo-visionOS/Assets.xcassets/Contents.json

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+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Demo/Demo-visionOS/Demo-visionOS/ContentView.swift

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+import SwiftUI
+
+struct ContentView: View {
+    @ObservedObject var coordinator = MPVMetalPlayerView.Coordinator()
+    @State var loading = false
+
+
+    var body: some View {
+        VStack {
+            MPVMetalPlayerView(coordinator: coordinator)
+                .play(URL(string: "https://github.com/mpvkit/video-test/raw/master/resources/HDR10_ToneMapping_Test_240_1000_nits.mp4")!)
+                .onPropertyChange{ player, propertyName, propertyData in
+                    switch propertyName {
+                    case MPVProperty.pausedForCache:
+                        loading = propertyData as! Bool
+                    default: break
+                    }
+                }
+        }
+        .overlay {
+            VStack {
+                Spacer()
+                ScrollView(.horizontal) {
+                    HStack {
+                        Button {
+                            coordinator.play(URL(string: "https://vjs.zencdn.net/v/oceans.mp4")!)
+                        } label: {
+                            Text("h264").frame(width: 130, height: 100)
+                        }
+                        Button {
+                            coordinator.play(URL(string: "https://github.com/mpvkit/video-test/raw/master/resources/h265.mp4")!)
+                        } label: {
+                            Text("h265").frame(width: 130, height: 100)
+                        }
+                        Button {
+                            coordinator.play(URL(string: "https://github.com/mpvkit/video-test/raw/master/resources/pgs_subtitle.mkv")!)
+                        } label: {
+                            Text("subtitle").frame(width: 130, height: 100)
+                        }
+                        Button {
+                            coordinator.play(URL(string: "https://github.com/mpvkit/video-test/raw/master/resources/hdr.mkv")!)
+                        } label: {
+                            Text("HDR").frame(width: 130, height: 100)
+                        }
+                        Button {
+                            coordinator.play(URL(string: "https://github.com/mpvkit/video-test/raw/master/resources/DolbyVision_P5.mp4")!)
+                        } label: {
+                            Text("DV_P5").frame(width: 130, height: 100)
+                        }
+                        Button {
+                            coordinator.play(URL(string: "https://github.com/mpvkit/video-test/raw/master/resources/DolbyVision_P8.mp4")!)
+                        } label: {
+                            Text("DV_P8").frame(width: 130, height: 100)
+                        }
+                    }
+                }
+            }
+        }
+        .overlay(overlayView)
+        .preferredColorScheme(.dark)
+    }
+
+    @ViewBuilder
+    private var overlayView: some View {
+        if loading {
+            ProgressView()
+        } else {
+            EmptyView()
+        }
+    }
+}

Demo/Demo-visionOS/Demo-visionOS/Demo_visionOSApp.swift

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+import SwiftUI
+
+@main
+struct Demo_visionOSApp: App {
+    var body: some Scene {
+        WindowGroup {
+            ContentView()
+        }
+        .defaultSize(width: 1280, height: 720)
+    }
+}

Demo/Demo-visionOS/Demo-visionOS/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>NSAppTransportSecurity</key>
+	<dict>
+		<key>NSAllowsArbitraryLoads</key>
+		<true/>
+	</dict>
+</dict>
+</plist>

Demo/Demo-visionOS/Demo-visionOS/Player/MPVPlayerDelegate.swift

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+import Foundation
+
+@MainActor
+public protocol MPVPlayerDelegate: AnyObject {
+    func propertyChange(mpv: OpaquePointer, propertyName: String, data: Any?)
+}

Demo/Demo-visionOS/Demo-visionOS/Player/MPVProperty.swift

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+import Foundation
+
+struct MPVProperty {
+    static let videoParamsColormatrix = "video-params/colormatrix"
+    static let videoParamsColorlevels = "video-params/colorlevels"
+    static let videoParamsPrimaries = "video-params/primaries"
+    static let videoParamsGamma = "video-params/gamma"
+    static let videoParamsSigPeak = "video-params/sig-peak"
+    static let videoParamsSceneMaxR = "video-params/scene-max-r"
+    static let videoParamsSceneMaxG = "video-params/scene-max-g"
+    static let videoParamsSceneMaxB = "video-params/scene-max-b"
+    static let pause = "pause"
+    static let pausedForCache = "paused-for-cache"
+}

Demo/Demo-visionOS/Demo-visionOS/Player/Metal/MPVMetalPlayerView.swift

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+import Foundation
+import SwiftUI
+
+struct MPVMetalPlayerView: UIViewControllerRepresentable {
+    @ObservedObject var coordinator: Coordinator
+
+    func makeUIViewController(context: Context) -> some UIViewController {
+        let mpv =  MPVMetalViewController()
+        mpv.playDelegate = coordinator
+        mpv.playUrl = coordinator.playUrl
+
+        context.coordinator.player = mpv
+        return mpv
+    }
+
+    func updateUIViewController(_ uiViewController: UIViewControllerType, context: Context) {
+    }
+
+    public func makeCoordinator() -> Coordinator {
+        coordinator
+    }
+
+    func play(_ url: URL) -> Self {
+        coordinator.playUrl = url
+        return self
+    }
+
+    func onPropertyChange(_ handler: @escaping (MPVMetalViewController, String, Any?) -> Void) -> Self {
+        coordinator.onPropertyChange = handler
+        return self
+    }
+
+    @MainActor
+    public final class Coordinator: MPVPlayerDelegate, ObservableObject {
+        weak var player: MPVMetalViewController?
+
+        var playUrl : URL?
+        var onPropertyChange: ((MPVMetalViewController, String, Any?) -> Void)?
+
+        func play(_ url: URL) {
+            player?.loadFile(url)
+        }
+
+        func propertyChange(mpv: OpaquePointer, propertyName: String, data: Any?) {
+            guard let player else { return }
+
+            self.onPropertyChange?(player, propertyName, data)
+        }
+    }
+}