Change type of PlaylistItemId to Guid

Emby.Server.Implementations/SyncPlay/Group.cs

@@ -505,7 +505,7 @@ namespace Emby.Server.Implementations.SyncPlay
         }
 
         /// <inheritdoc />
-        public bool SetPlayingItem(string playlistItemId)
+        public bool SetPlayingItem(Guid playlistItemId)
         {
             var itemFound = PlayQueue.SetPlayingItemByPlaylistId(playlistItemId);
 
@@ -525,7 +525,7 @@ namespace Emby.Server.Implementations.SyncPlay
         }
 
         /// <inheritdoc />
-        public bool RemoveFromPlayQueue(IReadOnlyList<string> playlistItemIds)
+        public bool RemoveFromPlayQueue(IReadOnlyList<Guid> playlistItemIds)
         {
             var playingItemRemoved = PlayQueue.RemoveFromPlaylist(playlistItemIds);
             if (playingItemRemoved)
@@ -548,7 +548,7 @@ namespace Emby.Server.Implementations.SyncPlay
         }
 
         /// <inheritdoc />
-        public bool MoveItemInPlayQueue(string playlistItemId, int newIndex)
+        public bool MoveItemInPlayQueue(Guid playlistItemId, int newIndex)
         {
             return PlayQueue.MovePlaylistItem(playlistItemId, newIndex);
         }

Jellyfin.Api/Models/SyncPlayDtos/BufferRequestDto.cs

@@ -12,7 +12,7 @@ namespace Jellyfin.Api.Models.SyncPlayDtos
         /// </summary>
         public BufferRequestDto()
         {
-            PlaylistItemId = string.Empty;
+            PlaylistItemId = Guid.Empty;
         }
 
         /// <summary>
@@ -37,6 +37,6 @@ namespace Jellyfin.Api.Models.SyncPlayDtos
         /// Gets or sets the playlist item identifier of the playing item.
         /// </summary>
         /// <value>The playlist item identifier.</value>
-        public string PlaylistItemId { get; set; }
+        public Guid PlaylistItemId { get; set; }
     }
 }

Jellyfin.Api/Models/SyncPlayDtos/MovePlaylistItemRequestDto.cs

@@ -1,3 +1,5 @@
+using System;
+
 namespace Jellyfin.Api.Models.SyncPlayDtos
 {
     /// <summary>
@@ -10,14 +12,14 @@ namespace Jellyfin.Api.Models.SyncPlayDtos
         /// </summary>
         public MovePlaylistItemRequestDto()
         {
-            PlaylistItemId = string.Empty;
+            PlaylistItemId = Guid.Empty;
         }
 
         /// <summary>
         /// Gets or sets the playlist identifier of the item.
         /// </summary>
         /// <value>The playlist identifier of the item.</value>
-        public string PlaylistItemId { get; set; }
+        public Guid PlaylistItemId { get; set; }
 
         /// <summary>
         /// Gets or sets the new position.

Jellyfin.Api/Models/SyncPlayDtos/NextItemRequestDto.cs

@@ -1,3 +1,5 @@
+using System;
+
 namespace Jellyfin.Api.Models.SyncPlayDtos
 {
     /// <summary>
@@ -10,13 +12,13 @@ namespace Jellyfin.Api.Models.SyncPlayDtos
         /// </summary>
         public NextItemRequestDto()
         {
-            PlaylistItemId = string.Empty;
+            PlaylistItemId = Guid.Empty;
         }
 
         /// <summary>
         /// Gets or sets the playing item identifier.
         /// </summary>
         /// <value>The playing item identifier.</value>
-        public string PlaylistItemId { get; set; }
+        public Guid PlaylistItemId { get; set; }
     }
 }

Jellyfin.Api/Models/SyncPlayDtos/PreviousItemRequestDto.cs

@@ -1,3 +1,5 @@
+using System;
+
 namespace Jellyfin.Api.Models.SyncPlayDtos
 {
     /// <summary>
@@ -10,13 +12,13 @@ namespace Jellyfin.Api.Models.SyncPlayDtos
         /// </summary>
         public PreviousItemRequestDto()
         {
-            PlaylistItemId = string.Empty;
+            PlaylistItemId = Guid.Empty;
         }
 
         /// <summary>
         /// Gets or sets the playing item identifier.
         /// </summary>
         /// <value>The playing item identifier.</value>
-        public string PlaylistItemId { get; set; }
+        public Guid PlaylistItemId { get; set; }
     }
 }

Jellyfin.Api/Models/SyncPlayDtos/ReadyRequestDto.cs

@@ -12,7 +12,7 @@ namespace Jellyfin.Api.Models.SyncPlayDtos
         /// </summary>
         public ReadyRequestDto()
         {
-            PlaylistItemId = string.Empty;
+            PlaylistItemId = Guid.Empty;
         }
 
         /// <summary>
@@ -37,6 +37,6 @@ namespace Jellyfin.Api.Models.SyncPlayDtos
         /// Gets or sets the playlist item identifier of the playing item.
         /// </summary>
         /// <value>The playlist item identifier.</value>
-        public string PlaylistItemId { get; set; }
+        public Guid PlaylistItemId { get; set; }
     }
 }

Jellyfin.Api/Models/SyncPlayDtos/RemoveFromPlaylistRequestDto.cs

@@ -13,13 +13,13 @@ namespace Jellyfin.Api.Models.SyncPlayDtos
         /// </summary>
         public RemoveFromPlaylistRequestDto()
         {
-            PlaylistItemIds = Array.Empty<string>();
+            PlaylistItemIds = Array.Empty<Guid>();
         }
 
         /// <summary>
         /// Gets or sets the playlist identifiers ot the items.
         /// </summary>
         /// <value>The playlist identifiers ot the items.</value>
-        public IReadOnlyList<string> PlaylistItemIds { get; set; }
+        public IReadOnlyList<Guid> PlaylistItemIds { get; set; }
     }
 }

Jellyfin.Api/Models/SyncPlayDtos/SetPlaylistItemRequestDto.cs

@@ -1,3 +1,5 @@
+using System;
+
 namespace Jellyfin.Api.Models.SyncPlayDtos
 {
     /// <summary>
@@ -10,13 +12,13 @@ namespace Jellyfin.Api.Models.SyncPlayDtos
         /// </summary>
         public SetPlaylistItemRequestDto()
         {
-            PlaylistItemId = string.Empty;
+            PlaylistItemId = Guid.Empty;
         }
 
         /// <summary>
         /// Gets or sets the playlist identifier of the playing item.
         /// </summary>
         /// <value>The playlist identifier of the playing item.</value>
-        public string PlaylistItemId { get; set; }
+        public Guid PlaylistItemId { get; set; }
     }
 }

MediaBrowser.Controller/SyncPlay/GroupStates/WaitingGroupState.cs

@@ -329,7 +329,7 @@ namespace MediaBrowser.Controller.SyncPlay.GroupStates
             }
 
             // Make sure the client is playing the correct item.
-            if (!request.PlaylistItemId.Equals(context.PlayQueue.GetPlayingItemPlaylistId(), StringComparison.OrdinalIgnoreCase))
+            if (!request.PlaylistItemId.Equals(context.PlayQueue.GetPlayingItemPlaylistId()))
             {
                 _logger.LogDebug("Session {SessionId} reported wrong playlist item in group {GroupId}.", session.Id, context.GroupId.ToString());
 
@@ -403,7 +403,7 @@ namespace MediaBrowser.Controller.SyncPlay.GroupStates
             }
 
             // Make sure the client is playing the correct item.
-            if (!request.PlaylistItemId.Equals(context.PlayQueue.GetPlayingItemPlaylistId(), StringComparison.OrdinalIgnoreCase))
+            if (!request.PlaylistItemId.Equals(context.PlayQueue.GetPlayingItemPlaylistId()))
             {
                 _logger.LogDebug("Session {SessionId} reported wrong playlist item in group {GroupId}.", session.Id, context.GroupId.ToString());
 
@@ -572,7 +572,7 @@ namespace MediaBrowser.Controller.SyncPlay.GroupStates
             ResumePlaying = true;
 
             // Make sure the client knows the playing item, to avoid duplicate requests.
-            if (!request.PlaylistItemId.Equals(context.PlayQueue.GetPlayingItemPlaylistId(), StringComparison.OrdinalIgnoreCase))
+            if (!request.PlaylistItemId.Equals(context.PlayQueue.GetPlayingItemPlaylistId()))
             {
                 _logger.LogDebug("Session {SessionId} provided the wrong playlist item for group {GroupId}.", session.Id, context.GroupId.ToString());
                 return;
@@ -618,7 +618,7 @@ namespace MediaBrowser.Controller.SyncPlay.GroupStates
             ResumePlaying = true;
 
             // Make sure the client knows the playing item, to avoid duplicate requests.
-            if (!request.PlaylistItemId.Equals(context.PlayQueue.GetPlayingItemPlaylistId(), StringComparison.OrdinalIgnoreCase))
+            if (!request.PlaylistItemId.Equals(context.PlayQueue.GetPlayingItemPlaylistId()))
             {
                 _logger.LogDebug("Session {SessionId} provided the wrong playlist item for group {GroupId}.", session.Id, context.GroupId.ToString());
                 return;

MediaBrowser.Controller/SyncPlay/IGroupStateContext.cs

@@ -158,14 +158,14 @@ namespace MediaBrowser.Controller.SyncPlay
         /// </summary>
         /// <param name="playlistItemId">The new playing item identifier.</param>
         /// <returns><c>true</c> if the play queue has been changed; <c>false</c> if something went wrong.</returns>
-        bool SetPlayingItem(string playlistItemId);
+        bool SetPlayingItem(Guid playlistItemId);
 
         /// <summary>
         /// Removes items from the play queue.
         /// </summary>
         /// <param name="playlistItemIds">The items to remove.</param>
         /// <returns><c>true</c> if playing item got removed; <c>false</c> otherwise.</returns>
-        bool RemoveFromPlayQueue(IReadOnlyList<string> playlistItemIds);
+        bool RemoveFromPlayQueue(IReadOnlyList<Guid> playlistItemIds);
 
         /// <summary>
         /// Moves an item in the play queue.
@@ -173,7 +173,7 @@ namespace MediaBrowser.Controller.SyncPlay
         /// <param name="playlistItemId">The playlist identifier of the item to move.</param>
         /// <param name="newIndex">The new position.</param>
         /// <returns><c>true</c> if item has been moved; <c>false</c> if something went wrong.</returns>
-        bool MoveItemInPlayQueue(string playlistItemId, int newIndex);
+        bool MoveItemInPlayQueue(Guid playlistItemId, int newIndex);
 
         /// <summary>
         /// Updates the play queue.

MediaBrowser.Controller/SyncPlay/PlaybackRequests/BufferGroupRequest.cs

@@ -17,7 +17,7 @@ namespace MediaBrowser.Controller.SyncPlay.PlaybackRequests
         /// <param name="positionTicks">The position ticks.</param>
         /// <param name="isPlaying">Whether the client playback is unpaused.</param>
         /// <param name="playlistItemId">The playlist item identifier of the playing item.</param>
-        public BufferGroupRequest(DateTime when, long positionTicks, bool isPlaying, string playlistItemId)
+        public BufferGroupRequest(DateTime when, long positionTicks, bool isPlaying, Guid playlistItemId)
         {
             When = when;
             PositionTicks = positionTicks;
@@ -47,7 +47,7 @@ namespace MediaBrowser.Controller.SyncPlay.PlaybackRequests
         /// Gets the playlist item identifier of the playing item.
         /// </summary>
         /// <value>The playlist item identifier.</value>
-        public string PlaylistItemId { get; }
+        public Guid PlaylistItemId { get; }
 
         /// <inheritdoc />
         public override PlaybackRequestType Action { get; } = PlaybackRequestType.Buffer;

MediaBrowser.Controller/SyncPlay/PlaybackRequests/MovePlaylistItemGroupRequest.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Threading;
 using MediaBrowser.Controller.Session;
 using MediaBrowser.Model.SyncPlay;
@@ -14,7 +15,7 @@ namespace MediaBrowser.Controller.SyncPlay.PlaybackRequests
         /// </summary>
         /// <param name="playlistItemId">The playlist identifier of the item.</param>
         /// <param name="newIndex">The new position.</param>
-        public MovePlaylistItemGroupRequest(string playlistItemId, int newIndex)
+        public MovePlaylistItemGroupRequest(Guid playlistItemId, int newIndex)
         {
             PlaylistItemId = playlistItemId;
             NewIndex = newIndex;
@@ -24,7 +25,7 @@ namespace MediaBrowser.Controller.SyncPlay.PlaybackRequests
         /// Gets the playlist identifier of the item.
         /// </summary>
         /// <value>The playlist identifier of the item.</value>
-        public string PlaylistItemId { get; }
+        public Guid PlaylistItemId { get; }
 
         /// <summary>
         /// Gets the new position.

MediaBrowser.Controller/SyncPlay/PlaybackRequests/NextItemGroupRequest.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Threading;
 using MediaBrowser.Controller.Session;
 using MediaBrowser.Model.SyncPlay;
@@ -13,7 +14,7 @@ namespace MediaBrowser.Controller.SyncPlay.PlaybackRequests
         /// Initializes a new instance of the <see cref="NextItemGroupRequest"/> class.
         /// </summary>
         /// <param name="playlistItemId">The playing item identifier.</param>
-        public NextItemGroupRequest(string playlistItemId)
+        public NextItemGroupRequest(Guid playlistItemId)
         {
             PlaylistItemId = playlistItemId;
         }
@@ -22,7 +23,7 @@ namespace MediaBrowser.Controller.SyncPlay.PlaybackRequests
         /// Gets the playing item identifier.
         /// </summary>
         /// <value>The playing item identifier.</value>
-        public string PlaylistItemId { get; }
+        public Guid PlaylistItemId { get; }
 
         /// <inheritdoc />
         public override PlaybackRequestType Action { get; } = PlaybackRequestType.NextItem;

MediaBrowser.Controller/SyncPlay/PlaybackRequests/PreviousItemGroupRequest.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Threading;
 using MediaBrowser.Controller.Session;
 using MediaBrowser.Model.SyncPlay;
@@ -13,7 +14,7 @@ namespace MediaBrowser.Controller.SyncPlay.PlaybackRequests
         /// Initializes a new instance of the <see cref="PreviousItemGroupRequest"/> class.
         /// </summary>
         /// <param name="playlistItemId">The playing item identifier.</param>
-        public PreviousItemGroupRequest(string playlistItemId)
+        public PreviousItemGroupRequest(Guid playlistItemId)
         {
             PlaylistItemId = playlistItemId;
         }
@@ -22,7 +23,7 @@ namespace MediaBrowser.Controller.SyncPlay.PlaybackRequests
         /// Gets the playing item identifier.
         /// </summary>
         /// <value>The playing item identifier.</value>
-        public string PlaylistItemId { get; }
+        public Guid PlaylistItemId { get; }
 
         /// <inheritdoc />
         public override PlaybackRequestType Action { get; } = PlaybackRequestType.PreviousItem;

MediaBrowser.Controller/SyncPlay/PlaybackRequests/ReadyGroupRequest.cs

@@ -17,7 +17,7 @@ namespace MediaBrowser.Controller.SyncPlay.PlaybackRequests
         /// <param name="positionTicks">The position ticks.</param>
         /// <param name="isPlaying">Whether the client playback is unpaused.</param>
         /// <param name="playlistItemId">The playlist item identifier of the playing item.</param>
-        public ReadyGroupRequest(DateTime when, long positionTicks, bool isPlaying, string playlistItemId)
+        public ReadyGroupRequest(DateTime when, long positionTicks, bool isPlaying, Guid playlistItemId)
         {
             When = when;
             PositionTicks = positionTicks;
@@ -47,7 +47,7 @@ namespace MediaBrowser.Controller.SyncPlay.PlaybackRequests
         /// Gets the playlist item identifier of the playing item.
         /// </summary>
         /// <value>The playlist item identifier.</value>
-        public string PlaylistItemId { get; }
+        public Guid PlaylistItemId { get; }
 
         /// <inheritdoc />
         public override PlaybackRequestType Action { get; } = PlaybackRequestType.Ready;

MediaBrowser.Controller/SyncPlay/PlaybackRequests/RemoveFromPlaylistGroupRequest.cs

@@ -15,16 +15,16 @@ namespace MediaBrowser.Controller.SyncPlay.PlaybackRequests
         /// Initializes a new instance of the <see cref="RemoveFromPlaylistGroupRequest"/> class.
         /// </summary>
         /// <param name="items">The playlist ids of the items to remove.</param>
-        public RemoveFromPlaylistGroupRequest(IReadOnlyList<string> items)
+        public RemoveFromPlaylistGroupRequest(IReadOnlyList<Guid> items)
         {
-            PlaylistItemIds = items ?? Array.Empty<string>();
+            PlaylistItemIds = items ?? Array.Empty<Guid>();
         }
 
         /// <summary>
         /// Gets the playlist identifiers ot the items.
         /// </summary>
         /// <value>The playlist identifiers ot the items.</value>
-        public IReadOnlyList<string> PlaylistItemIds { get; }
+        public IReadOnlyList<Guid> PlaylistItemIds { get; }
 
         /// <inheritdoc />
         public override PlaybackRequestType Action { get; } = PlaybackRequestType.RemoveFromPlaylist;

MediaBrowser.Controller/SyncPlay/PlaybackRequests/SetPlaylistItemGroupRequest.cs

@@ -1,3 +1,4 @@
+using System;
 using System.Threading;
 using MediaBrowser.Controller.Session;
 using MediaBrowser.Model.SyncPlay;
@@ -13,7 +14,7 @@ namespace MediaBrowser.Controller.SyncPlay.PlaybackRequests
         /// Initializes a new instance of the <see cref="SetPlaylistItemGroupRequest"/> class.
         /// </summary>
         /// <param name="playlistItemId">The playlist identifier of the item.</param>
-        public SetPlaylistItemGroupRequest(string playlistItemId)
+        public SetPlaylistItemGroupRequest(Guid playlistItemId)
         {
             PlaylistItemId = playlistItemId;
         }
@@ -22,7 +23,7 @@ namespace MediaBrowser.Controller.SyncPlay.PlaybackRequests
         /// Gets the playlist identifier of the playing item.
         /// </summary>
         /// <value>The playlist identifier of the playing item.</value>
-        public string PlaylistItemId { get; }
+        public Guid PlaylistItemId { get; }
 
         /// <inheritdoc />
         public override PlaybackRequestType Action { get; } = PlaybackRequestType.SetPlaylistItem;

MediaBrowser.Controller/SyncPlay/Queue/PlayQueueManager.cs

@@ -66,12 +66,6 @@ namespace MediaBrowser.Controller.SyncPlay.Queue
         /// <value>The shuffled playlist, or play queue of the group.</value>
         private List<QueueItem> ShuffledPlaylist { get; set; } = new List<QueueItem>();
 
-        /// <summary>
-        /// Gets or sets the progressive identifier counter.
-        /// </summary>
-        /// <value>The progressive identifier.</value>
-        private int ProgressiveId { get; set; }
-
         /// <summary>
         /// Checks if an item is playing.
         /// </summary>
@@ -233,10 +227,10 @@ namespace MediaBrowser.Controller.SyncPlay.Queue
         /// Gets playlist identifier of the playing item, if any.
         /// </summary>
         /// <returns>The playlist identifier of the playing item.</returns>
-        public string GetPlayingItemPlaylistId()
+        public Guid GetPlayingItemPlaylistId()
         {
             var playingItem = GetPlayingItem();
-            return playingItem?.PlaylistItemId;
+            return playingItem?.PlaylistItemId ?? Guid.Empty;
         }
 
         /// <summary>
@@ -265,10 +259,10 @@ namespace MediaBrowser.Controller.SyncPlay.Queue
         /// </summary>
         /// <param name="playlistItemId">The new playing item identifier.</param>
         /// <returns><c>true</c> if playing item has been set; <c>false</c> if item is not in the playlist.</returns>
-        public bool SetPlayingItemByPlaylistId(string playlistItemId)
+        public bool SetPlayingItemByPlaylistId(Guid playlistItemId)
         {
             var playlist = GetPlaylistInternal();
-            PlayingItemIndex = playlist.FindIndex(item => item.PlaylistItemId.Equals(playlistItemId, StringComparison.OrdinalIgnoreCase));
+            PlayingItemIndex = playlist.FindIndex(item => item.PlaylistItemId.Equals(playlistItemId));
             LastChange = DateTime.UtcNow;
 
             return PlayingItemIndex != NoPlayingItemIndex;
@@ -298,7 +292,7 @@ namespace MediaBrowser.Controller.SyncPlay.Queue
         /// </summary>
         /// <param name="playlistItemIds">The items to remove.</param>
         /// <returns><c>true</c> if playing item got removed; <c>false</c> otherwise.</returns>
-        public bool RemoveFromPlaylist(IReadOnlyList<string> playlistItemIds)
+        public bool RemoveFromPlaylist(IReadOnlyList<Guid> playlistItemIds)
         {
             var playingItem = GetPlayingItem();
 
@@ -341,12 +335,12 @@ namespace MediaBrowser.Controller.SyncPlay.Queue
         /// <param name="playlistItemId">The item to move.</param>
         /// <param name="newIndex">The new position.</param>
         /// <returns><c>true</c> if the item has been moved; <c>false</c> otherwise.</returns>
-        public bool MovePlaylistItem(string playlistItemId, int newIndex)
+        public bool MovePlaylistItem(Guid playlistItemId, int newIndex)
         {
             var playlist = GetPlaylistInternal();
             var playingItem = GetPlayingItem();
 
-            var oldIndex = playlist.FindIndex(item => item.PlaylistItemId.Equals(playlistItemId, StringComparison.OrdinalIgnoreCase));
+            var oldIndex = playlist.FindIndex(item => item.PlaylistItemId.Equals(playlistItemId));
             if (oldIndex < 0)
             {
                 return false;
@@ -367,7 +361,6 @@ namespace MediaBrowser.Controller.SyncPlay.Queue
         /// </summary>
         public void Reset()
         {
-            ProgressiveId = 0;
             SortedPlaylist.Clear();
             ShuffledPlaylist.Clear();
             PlayingItemIndex = NoPlayingItemIndex;
@@ -529,15 +522,6 @@ namespace MediaBrowser.Controller.SyncPlay.Queue
             }
         }
 
-        /// <summary>
-        /// Gets the next available identifier.
-        /// </summary>
-        /// <returns>The next available identifier.</returns>
-        private int GetNextProgressiveId()
-        {
-            return ProgressiveId++;
-        }
-
         /// <summary>
         /// Creates a list from the array of items. Each item is given an unique playlist identifier.
         /// </summary>
@@ -547,7 +531,7 @@ namespace MediaBrowser.Controller.SyncPlay.Queue
             var list = new List<QueueItem>();
             foreach (var item in items)
             {
-                var queueItem = new QueueItem(item, "syncPlayItem" + GetNextProgressiveId());
+                var queueItem = new QueueItem(item);
                 list.Add(queueItem);
             }
 

MediaBrowser.Model/SyncPlay/QueueItem.cs

@@ -11,11 +11,9 @@ namespace MediaBrowser.Model.SyncPlay
         /// Initializes a new instance of the <see cref="QueueItem"/> class.
         /// </summary>
         /// <param name="itemId">The item identifier.</param>
-        /// <param name="playlistItemId">The playlist identifier of the item.</param>
+        public QueueItem(Guid itemId)
-        public QueueItem(Guid itemId, string playlistItemId)
         {
             ItemId = itemId;
-            PlaylistItemId = playlistItemId;
         }
 
         /// <summary>
@@ -28,6 +26,6 @@ namespace MediaBrowser.Model.SyncPlay
         /// Gets the playlist identifier of the item.
         /// </summary>
         /// <value>The playlist identifier of the item.</value>
-        public string PlaylistItemId { get; }
+        public Guid PlaylistItemId { get; } = Guid.NewGuid();
     }
 }

MediaBrowser.Model/SyncPlay/SendCommand.cs

@@ -16,7 +16,7 @@ namespace MediaBrowser.Model.SyncPlay
         /// <param name="command">The command.</param>
         /// <param name="positionTicks">The position ticks, for commands that require it.</param>
         /// <param name="emittedAt">The UTC time when this command has been emitted.</param>
-        public SendCommand(Guid groupId, string playlistItemId, DateTime when, SendCommandType command, long? positionTicks, DateTime emittedAt)
+        public SendCommand(Guid groupId, Guid playlistItemId, DateTime when, SendCommandType command, long? positionTicks, DateTime emittedAt)
         {
             GroupId = groupId;
             PlaylistItemId = playlistItemId;
@@ -36,7 +36,7 @@ namespace MediaBrowser.Model.SyncPlay
         /// Gets the playlist identifier of the playing item.
         /// </summary>
         /// <value>The playlist identifier of the playing item.</value>
-        public string PlaylistItemId { get; }
+        public Guid PlaylistItemId { get; }
 
         /// <summary>
         /// Gets or sets the UTC time when to execute the command.