Feature: Ability to seek track to specific millisecond

Source/Jukebox.swift

@@ -134,17 +134,17 @@ extension Jukebox {
      - parameter shouldPlay: pass true if playback should be resumed after seeking
      */
     public func seek(toSecond second: Int, shouldPlay: Bool = false) {
-        guard let player = player, let item = currentItem else {return}
-        
-        player.seekToTime(CMTimeMake(Int64(second), 1))
-        item.update()
-        if shouldPlay {
-            player.play()
-            if state != .Playing {
-                state = .Playing
-            }
-        }
-        delegate?.jukeboxPlaybackProgressDidChange(self)
+        seekCurrentItem(toMillisecond: second * 1000, shouldPlay: shouldPlay)
+    }
+
+    /**
+     Seeks to a certain millisecond within the current AVPlayerItem and starts playing
+
+     - parameter millisecond: the millisecond to seek to
+     - parameter shouldPlay: pass true if playback should be resumed after seeking
+     */
+    public func seek(toMillisecond millisecond: Int, shouldPlay: Bool = false) {
+        seekCurrentItem(toMillisecond: millisecond, shouldPlay: shouldPlay)
     }
 
     /**
@@ -382,6 +382,20 @@ public class Jukebox: NSObject, JukeboxItemDelegate {
         updateInfoCenter()
     }
 
+    private func seekCurrentItem(toMillisecond millisecond: Int, shouldPlay: Bool) {
+        guard let player = player, let item = currentItem else {return}
+
+        player.seekToTime(CMTimeMake(Int64(millisecond), 1000))
+        item.update()
+        if shouldPlay {
+            player.play()
+            if state != .Playing {
+                state = .Playing
+            }
+        }
+        delegate?.jukeboxPlaybackProgressDidChange(self)
+    }
+
     // MARK: Items related
 
     private func assignQueuedItems (items: [JukeboxItem]) {

Source/JukeboxItem.swift

@@ -34,10 +34,19 @@ protocol JukeboxItemDelegate : class {
 public class JukeboxItem: NSObject {
 
     public struct Meta {
+        /// The duration of the item in seconds.
         private(set) public var duration: Double?
+
+        /// The title of the item.
         private(set) public var title: String?
+
+        /// The album the item belongs to.
         private(set) public var album: String?
+
+        /// The artist of the item.
         private(set) public var artist: String?
+
+        /// The artwork of the item.
         private(set) public var artwork: UIImage?
     }