Added base classes to encapsulate metadata in media

Aurora/Backend/Models/Media/AudioMetadata.cs

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+using System;
+
+namespace Aurora.Backend.Models.Media
+{
+    public class AudioMetadata : BaseMetadata
+    {
+        public void AutioMetadata()
+        {
+        }
+
+        /// <summary>
+        /// The title of the song.
+        /// </summary>
+        /// <value></value>
+        public string Title { get; set; }
+
+        /// <summary>
+        /// The artist of the song.
+        /// </summary>
+        /// <value></value>
+        public string Artist { get; set; }
+
+        /// <summary>
+        /// The album from which the song belongs.
+        /// </summary>
+        /// <value></value>
+        public string Album { get; set; }
+
+        /// <summary>
+        /// The duration of the song.
+        /// </summary>
+        /// <value></value>
+        public string Duration { get; set; }
+    }
+}

Aurora/Backend/Models/Media/BaseMedia.cs

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+using System;
+using System.IO;
+
+namespace Aurora.Backend.Models.Media
+{
+    public abstract class BaseMedia
+    {
+        private bool _loaded;
+        private Stream _stream;
+
+        public BaseMedia()
+        {
+            _loaded = false;
+            Id = Guid.NewGuid().ToString();
+        }
+
+        #region Properties
+        public string Id { get; private set; }
+
+        #endregion Properties
+
+        public virtual void Load()
+        {
+            _loaded = true;
+        }
+
+        public virtual void Unload()
+        {
+            _loaded = false;
+        }
+
+        public abstract MediaTypeEnum MediaType { get; }
+
+
+        /// <summary>
+        /// Gets or sets the data stream that holds the song.
+        /// </summary>
+        /// <value>The data stream.</value>
+        public Stream DataStream
+        {
+            get
+            {
+                return _stream;
+            }
+            protected set
+            {
+                if (value != _stream)
+                {
+                    _stream = value;
+                }
+            }
+        }
+    }
+}

Aurora/Backend/Models/Media/BaseMetadata.cs

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+using System;
+namespace Aurora.Backend.Models.Media
+{
+    public class BaseMetadata
+    {
+        public BaseMetadata()
+        {
+        }
+
+        /// <summary>
+        /// Extra data associated with a song.
+        /// </summary>
+        /// <value></value>
+        public object ExtraData { get; set; }
+
+    }
+}

Aurora/Backend/Models/Media/LocalAudio.cs

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+using System;
+using System.IO;
+
+namespace Aurora.Backend.Models.Media
+{
+    public class LocalAudio : BaseMedia
+    {
+        public LocalAudio(FileInfo fileInfo)
+        {
+            File = fileInfo;
+            LoadMetadata();
+        }
+
+        #region Properties
+        public FileInfo File { get; private set; }
+
+        public AudioMetadata Metadata { get; private set; }
+
+        public override MediaTypeEnum MediaType
+        {
+            get { return MediaTypeEnum.Audio; }
+        }
+
+        #endregion Properties
+
+        /// <summary>
+        /// Override load method.
+        /// </summary>
+        public override void Load()
+        {
+            if (this.DataStream != null)
+            {
+                DataStream.Close();
+                DataStream = null;
+            }
+            this.DataStream = System.IO.File.OpenRead(File.FullName);
+            base.Load();
+        }
+
+        /// <summary>
+        /// Override unload method
+        /// </summary>
+        public override void Unload()
+        {
+            if (this.DataStream != null)
+            {
+                DataStream.Close();
+                DataStream = null;
+            }
+            base.Unload();
+        }
+
+        private void LoadMetadata()
+        {
+            TagLib.File tagFile = TagLib.File.Create(File.FullName);
+
+            Metadata = new AudioMetadata()
+            {
+                Title = tagFile.Tag.Title,
+                Album = tagFile.Tag.Album,
+                Artist = tagFile.Tag.FirstAlbumArtist,
+                ExtraData = tagFile.Tag
+            };
+        }
+    }
+}

Aurora/Backend/Models/Media/MediaTypeEnum.cs

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+using System;
+namespace Aurora.Backend.Models.Media
+{
+    public enum MediaTypeEnum
+    {
+        Audio,
+        Video,
+    }
+}