adding preloadNext & cancelAllPreloads

Author: mynameisguy

SwiftAudioEx/Classes/AVPlayerWrapper/AVPlayerWrapper.swift

@@ -335,6 +335,15 @@ extension AVPlayerWrapper: AVPlayerObserverDelegate {
          self.preloadedAssets[url] = nil;
      }
 
+    func cancelAllPreloads() {
+        for asset in self.preloadedAssets {
+            if (self.preloadedAssets[asset.key] != nil){
+                self.preloadedAssets[asset.key]?.cancelLoading();
+                self.preloadedAssets[asset.key] = nil;
+            }
+        }
+    }
+
     func preload(item: AudioItem) {
         let urlString = item.getSourceUrl();
         let url =  URL(string: urlString);

SwiftAudioEx/Classes/AudioPlayer.swift

@@ -190,16 +190,20 @@ public class AudioPlayer: AVPlayerWrapperDelegate {
      Preload item.
      */
     public func preload(item: AudioItem) {
-         self.wrapper.preload(item: item);
-     }
+        self.wrapper.preload(item: item);
+    }
 
     /**
      cancel preload item.
      */
-     public func cancelPreload(item: AudioItem) {
-         self.wrapper.cancelPreload(item: item);
-     }
-    
+    public func cancelPreload(item: AudioItem) {
+        self.wrapper.cancelPreload(item: item);
+    }
+
+    public func cancelAllPreloads() {
+        self.wrapper.cancelAllPreloads();
+    }
+
     /**
      Toggle playback status.
      */

SwiftAudioEx/Classes/QueuedAudioPlayer.swift

@@ -231,4 +231,12 @@ public class QueuedAudioPlayer: AudioPlayer, QueueManagerDelegate {
     func onReceivedFirstItem() {
         self.event.queueIndex.emit(data: (nil, 0))
     }
+
+    func preloadNext() {
+        let nextItems = queueManager.nextItems
+
+        if nextItems.count > 0 {
+             self.preload(item: nextItems[0])
+        }
+    }
 }