Add currently-unused player update from UI

RedBookPlayer/GUI/PlayerView.xaml.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.ComponentModel;
 using System.IO;
 using System.Linq;
 using System.Threading.Tasks;
@@ -120,6 +121,7 @@ namespace RedBookPlayer.GUI
         private void InitializeComponent(string xaml)
         {
             DataContext = new PlayerViewModel();
+            (DataContext as PlayerViewModel).PropertyChanged += UpdateModel;
 
             // Load the theme
             try
@@ -189,6 +191,17 @@ namespace RedBookPlayer.GUI
             };
         }
 
+        /// <summary>
+        /// Update the Player with the most recent information from the UI
+        /// </summary>
+        private void UpdateModel(object sender, PropertyChangedEventArgs e)
+        {
+            Dispatcher.UIThread.InvokeAsync(() =>
+            {
+                Player.UpdateModel(DataContext as PlayerViewModel);
+            });
+        }
+
         /// <summary>
         /// Update the UI with the most recent information from the Player
         /// </summary>

RedBookPlayer/Hardware/Player.cs

@@ -294,6 +294,19 @@ namespace RedBookPlayer.Hardware
             }
         }
 
+        /// <summary>
+        /// Update the internal values from the frontend
+        /// </summary>
+        /// <param name="dataContext">Data context to update from</param>
+        public void UpdateModel(PlayerViewModel dataContext)
+        {
+            if(!Initialized || dataContext == null)
+                return;
+
+            App.Settings.Volume = dataContext.Volume;
+            ToggleDeEmphasis(dataContext.ApplyDeEmphasis);
+        }
+
         /// <summary>
         /// Get current sector time, accounting for offsets
         /// </summary>