video-player: hide mute button when we have no audio

damus/Views/Video/DamusVideoPlayer.swift

@@ -13,13 +13,22 @@ struct DamusVideoPlayer: View {
     @Binding var video_size: CGSize?
     
     var mute_icon: String {
-        if model.muted {
+        if model.has_audio == false || model.muted {
             return "speaker.slash"
         } else {
             return "speaker"
         }
     }
     
+    var mute_icon_color: Color {
+        switch self.model.has_audio {
+        case .none:
+            return .white
+        case .some(let has_audio):
+            return has_audio ? .white : .red
+        }
+    }
+    
     var MuteIcon: some View {
         ZStack {
             Circle()
@@ -29,7 +38,7 @@ struct DamusVideoPlayer: View {
             
             Image(systemName: mute_icon)
                 .padding()
-                .foregroundColor(.white)
+                .foregroundColor(mute_icon_color)
         }
     }
     
@@ -43,10 +52,13 @@ struct DamusVideoPlayer: View {
                     model.stop()
                 }
             
-            MuteIcon
-        }
-        .onTapGesture {
-            self.model.muted = !self.model.muted
+            if model.has_audio == true {
+                MuteIcon
+                    .zIndex(11.0)
+                    .onTapGesture {
+                        self.model.muted = !self.model.muted
+                    }
+            }
         }
         .onChange(of: model.size) { size in
             guard let size else {

damus/Views/Video/VideoPlayer.swift

@@ -44,7 +44,9 @@ public class VideoPlayerModel: ObservableObject {
     @Published var muted: Bool = true
     @Published var play: Bool = true
     @Published var size: CGSize? = nil
+    @Published var has_audio: Bool? = nil
     @Published var contentMode: UIView.ContentMode = .scaleAspectFill
+    
     var time: CMTime = CMTime()
     var handlers: [VideoHandler] = []
     
@@ -168,6 +170,16 @@ public extension VideoPlayer {
     
 }
 
+func get_video_size(player: AVPlayer) -> CGSize? {
+    // TODO: make this async?
+    return player.currentImage?.size
+}
+
+func video_has_audio(player: AVPlayer) async -> Bool {
+    let tracks = try? await player.currentItem?.asset.load(.tracks)
+    return tracks?.filter({ t in t.mediaType == .audio }).first != nil
+}
+
 @available(iOS 13, *)
 extension VideoPlayer: UIViewRepresentable {
     
@@ -204,14 +216,24 @@ extension VideoPlayer: UIViewRepresentable {
             
             if case .playing = state {
                 context.coordinator.startObserver(uiView: uiView)
+                
+                if let player = uiView.player {
+                    Task {
+                        let has_audio = await video_has_audio(player: player)
+                        let size = get_video_size(player: player)
+                        Task { @MainActor in
+                            if let size {
+                                self.model.size = size
+                            }
+                            self.model.has_audio = has_audio
+                        }
+                    }
+                }
+                
             } else {
                 context.coordinator.stopObserver(uiView: uiView)
             }
             
-            if model.size == nil, let size = uiView.player?.currentImage?.size {
-                model.size = size
-            }
-            
             DispatchQueue.main.async {
                 for handler in model.handlers {
                     if case .onStateChanged(let cb) = handler {
@@ -240,7 +262,6 @@ extension VideoPlayer: UIViewRepresentable {
             uiView.pause(reason: .userInteraction)
         }
         
-        print("intrinsic video size \(uiView.intrinsicContentSize)")
         uiView.isMuted = model.muted
         uiView.isAutoReplay = model.autoReplay