Update podspec. Update readme.

Bumpe versions to 0.5.0.

Example/Pods/Pods.xcodeproj/xcshareddata/xcschemes/SwiftAudio.xcscheme

@@ -0,0 +1,71 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "0930"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "1AB61EB02FDF0033DCB1F8416419F110"
+               BuildableName = "SwiftAudio.framework"
+               BlueprintName = "SwiftAudio"
+               ReferencedContainer = "container:Pods.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <Testables>
+      </Testables>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "1AB61EB02FDF0033DCB1F8416419F110"
+            BuildableName = "SwiftAudio.framework"
+            BlueprintName = "SwiftAudio"
+            ReferencedContainer = "container:Pods.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <AdditionalOptions>
+      </AdditionalOptions>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

Example/SwiftAudio/AudioController.swift

@@ -17,10 +17,10 @@ class AudioController {
     let audioSessionController = AudioSessionController.shared
     
     let sources: [AudioItem] = [
-        DefaultAudioItem(audioUrl: "https://p.scdn.co/mp3-preview/67b51d90ffddd6bb3f095059997021b589845f81?cid=d8a5ed958d274c2e8ee717e6a4b0971d", artist: "Bon Iver", title: "33 \"GOD\"", albumTitle: "22, A Million", sourceType: .stream, pitchAlgorithmType: .lowQualityZeroLatency, artwork: #imageLiteral(resourceName: "22AMI")),
-        DefaultAudioItem(audioUrl: "https://p.scdn.co/mp3-preview/081447adc23dad4f79ba4f1082615d1c56edf5e1?cid=d8a5ed958d274c2e8ee717e6a4b0971d", artist: "Bon Iver", title: "8 (circle)", albumTitle: "22, A Million", sourceType: .stream, pitchAlgorithmType: .lowQualityZeroLatency, artwork: #imageLiteral(resourceName: "22AMI")),
-        DefaultAudioItem(audioUrl: "https://p.scdn.co/mp3-preview/6f9999d909b017eabef97234dd7a206355720d9d?cid=d8a5ed958d274c2e8ee717e6a4b0971d", artist: "Bon Iver", title: "715 - CRΣΣKS", albumTitle: "22, A Million", sourceType: .stream, pitchAlgorithmType: .lowQualityZeroLatency, artwork: #imageLiteral(resourceName: "22AMI")),
-        DefaultAudioItem(audioUrl: "https://p.scdn.co/mp3-preview/bf9bdd403c67fdbe06a582e7b292487c8cfd1f7e?cid=d8a5ed958d274c2e8ee717e6a4b0971d", artist: "Bon Iver", title: "____45_____", albumTitle: "22, A Million", sourceType: .stream, pitchAlgorithmType: .lowQualityZeroLatency, artwork: #imageLiteral(resourceName: "22AMI"))
+        DefaultAudioItem(audioUrl: "https://p.scdn.co/mp3-preview/67b51d90ffddd6bb3f095059997021b589845f81?cid=d8a5ed958d274c2e8ee717e6a4b0971d", artist: "Bon Iver", title: "33 \"GOD\"", albumTitle: "22, A Million", sourceType: .stream, artwork: #imageLiteral(resourceName: "22AMI")),
+        DefaultAudioItem(audioUrl: "https://p.scdn.co/mp3-preview/081447adc23dad4f79ba4f1082615d1c56edf5e1?cid=d8a5ed958d274c2e8ee717e6a4b0971d", artist: "Bon Iver", title: "8 (circle)", albumTitle: "22, A Million", sourceType: .stream, artwork: #imageLiteral(resourceName: "22AMI")),
+        DefaultAudioItem(audioUrl: "https://p.scdn.co/mp3-preview/6f9999d909b017eabef97234dd7a206355720d9d?cid=d8a5ed958d274c2e8ee717e6a4b0971d", artist: "Bon Iver", title: "715 - CRΣΣKS", albumTitle: "22, A Million", sourceType: .stream, artwork: #imageLiteral(resourceName: "22AMI")),
+        DefaultAudioItem(audioUrl: "https://p.scdn.co/mp3-preview/bf9bdd403c67fdbe06a582e7b292487c8cfd1f7e?cid=d8a5ed958d274c2e8ee717e6a4b0971d", artist: "Bon Iver", title: "____45_____", albumTitle: "22, A Million", sourceType: .stream, artwork: #imageLiteral(resourceName: "22AMI"))
     ]
     
     init() {

Example/Tests/AudioPlayerTests.swift

@@ -1,5 +1,6 @@
 import Quick
 import Nimble
+import AVFoundation
 
 @testable import SwiftAudio
 
@@ -151,6 +152,34 @@ class AudioPlayerTests: QuickSpec {
                         expect(audioPlayer.currentItem).toNot(beNil())
                     })
                 })
+                
+                context("when setting the timePitchAlgorithm", {
+                    
+                    beforeEach {
+                        audioPlayer.audioTimePitchAlgorithm = .timeDomain
+                    }
+                    
+                    context("then loading an item", {
+                        beforeEach {
+                            try? audioPlayer.load(item: Source.getAudioItem(), playWhenReady: false)
+                        }
+                        
+                        it("should have the applied timePitchAlgorithm", closure: {
+                            expect(audioPlayer.wrapper.currentItem?.audioTimePitchAlgorithm).to(equal(AVAudioTimePitchAlgorithm.timeDomain))
+                        })
+                    })
+                    
+                    context("then loading a timepitching item", {
+                        beforeEach {
+                            let item = DefaultAudioItemTimePitching(audioUrl: Source.path, artist: nil, title: nil, albumTitle: nil, sourceType: .file, artwork: nil, audioTimePitchAlgorithm: AVAudioTimePitchAlgorithm.spectral)
+                            try? audioPlayer.load(item: item, playWhenReady: false)
+                        }
+                        
+                        it("should have the applied timePitchAlgorithm", closure: {
+                            expect(audioPlayer.wrapper.currentItem?.audioTimePitchAlgorithm).to(equal(AVAudioTimePitchAlgorithm.spectral))
+                        })
+                    })
+                })
             })
         }
     }

Example/Tests/QueueManagerTests.swift

@@ -170,6 +170,18 @@ class QueueManagerTests: QuickSpec {
                             expect(manager.current).to(equal(self.dummyItems.first))
                         })
                     })
+                    
+                    context("then removing previous items", {
+                        beforeEach {
+                            manager.removePreviousItems()
+                        }
+                        it("should have no previous items", closure: {
+                            expect(manager.previousItems.count).to(equal(0))
+                        })
+                        it("should have current index zero", closure: {
+                            expect(manager.currentIndex).to(equal(0))
+                        })
+                    })
                 })
                 
                 context("adding more items", {

Example/Tests/QueuedAudioPlayerTests.swift

@@ -98,6 +98,26 @@ class QueuedAudioPlayerTests: QuickSpec {
                             expect(audioPlayer.nextItems.count).to(equal(0))
                         })
                     })
+                    
+                    context("then removing upcoming items", {
+                        beforeEach {
+                            audioPlayer.removeUpcomingItems()
+                        }
+                        
+                        it("should be empty", closure: {
+                            expect(audioPlayer.nextItems.count).to(equal(0))
+                        })
+                    })
+                    
+                    context("then stopping", {
+                        beforeEach {
+                            audioPlayer.stop()
+                        }
+                        
+                        it("should be empty", closure: {
+                            expect(audioPlayer.nextItems.count).to(equal(0))
+                        })
+                    })
                 })
             })
             
@@ -124,6 +144,26 @@ class QueuedAudioPlayerTests: QuickSpec {
                         })
                     })
                     
+                    context("then removing all previous items", {
+                        beforeEach {
+                            audioPlayer.removePreviousItems()
+                        }
+                        
+                        it("should be empty", closure: {
+                            expect(audioPlayer.previousItems.count).to(equal(0))
+                        })
+                    })
+                    
+                    context("then stopping", {
+                        beforeEach {
+                            audioPlayer.stop()
+                        }
+                        
+                        it("should be empty", closure: {
+                            expect(audioPlayer.previousItems.count).to(equal(0))
+                        })
+                    })
+                    
                 })
             })
         }

Example/Tests/Source/Source.swift

@@ -14,7 +14,7 @@ struct Source {
     static let url: URL = URL(fileURLWithPath: Source.path)
     
     static func getAudioItem() -> AudioItem {
-        return DefaultAudioItem(audioUrl: Source.path, sourceType: .file, pitchAlgorithmType: .lowQualityZeroLatency)
+        return DefaultAudioItem(audioUrl: Source.path, sourceType: .file)
     }
 }
 
@@ -23,6 +23,6 @@ struct ShortSource {
     static let url: URL = URL(fileURLWithPath: Source.path)
     
     static func getAudioItem() -> AudioItem {
-        return DefaultAudioItem(audioUrl: ShortSource.path, sourceType: .file, pitchAlgorithmType: .lowQualityZeroLatency)
+        return DefaultAudioItem(audioUrl: ShortSource.path, sourceType: .file)
     }
 }

README.md

@@ -18,20 +18,28 @@ iOS 10.0+
 
 ## Installation
 
+### CocoaPods
 SwiftAudio is available through [CocoaPods](http://cocoapods.org). To install
 it, simply add the following line to your Podfile:
 
 ```ruby
-pod 'SwiftAudio', '~> 0.4.0'
+pod 'SwiftAudio', '~> 0.5.0'
 ```
 
+### Carthage
+SwiftAudio supports [Carthage](https://github.com/Carthage/Carthage). Add this to your Cartfile:
+```ruby
+github "jorgenhenrichsen/SwiftAudio" ~> 0.5.0
+```
+Then follow the rest of Carthage instructions on [adding a framework](https://github.com/Carthage/Carthage#adding-frameworks-to-an-application).
+
 ## Usage
 
 ### AudioPlayer
 To get started playing some audio:
 ```swift
 let player = AudioPlayer()
-let audioItem = DefaultAudioItem(audioUrl: "someUrl", sourceType: .stream, pitchAlgorithmType: .lowQualityZeroLatency)
+let audioItem = DefaultAudioItem(audioUrl: "someUrl", sourceType: .stream)
 player.load(item: audioItem, playWhenReady: true) // Load the item and start playing when the player is ready.
 ```
 
@@ -41,7 +49,7 @@ Implement `AudioPlayerDelegate` to get notified about useful events and updates
 The `QueuedAudioPlayer` is asubclass of `AudioPlayer` that maintains a queue of audio tracks.
 ```swift
 let player = QueuedAudioPlayer()
-let audioItem = DefaultAudioItem(audioUrl: "someUrl", sourceType: .stream, pitchAlgorithmType: .lowQualityZeroLatency)
+let audioItem = DefaultAudioItem(audioUrl: "someUrl", sourceType: .stream)
 player.add(item: audioItem, playWhenReady: true) // Since this is the first item, we can supply playWhenReady: true to immedietaly start playing when the item is loaded.
 ```
 
@@ -69,6 +77,7 @@ Current options for configuring the `AudioPlayer`:
 - `volume`
 - `isMuted`
 - `rate`
+- `audioTimePitchAlgorithm`: This value decides the `AVAudioTimePitchAlgorithm` used for each `AudioItem`. Implement `TimePitching` in your `AudioItem`-subclass to override individually for each `AudioItem`.
 
 ### Audio Session
 Remember to activate an audio session with an appropriate category for your app. This can be done with `AudioSessionController`:

SwiftAudio.podspec

@@ -8,7 +8,7 @@
 
 Pod::Spec.new do |s|
   s.name             = 'SwiftAudio'
-  s.version          = '0.4.0'
+  s.version          = '0.5.0'
   s.summary          = 'Easy audio streaming for iOS'
 
 # This description is used to generate tags and improve search results.

SwiftAudio/Classes/AVPlayerWrapper/AVPlayerWrapper.swift

@@ -88,7 +88,11 @@ class AVPlayerWrapper: AVPlayerWrapperProtocol {
         if let seconds = currentItem?.duration.seconds, !seconds.isNaN {
             return seconds
         }
-        return 0
+        else if let seconds = currentItem?.loadedTimeRanges.first?.timeRangeValue.duration.seconds,
+            !seconds.isNaN {
+            return seconds
+        }
+        return 0.0
     }
     
     weak var delegate: AVPlayerWrapperDelegate? = nil
@@ -144,7 +148,7 @@ class AVPlayerWrapper: AVPlayerWrapperProtocol {
         }
     }
 
-    public func load(from url: URL, playWhenReady: Bool) {
+    func load(from url: URL, playWhenReady: Bool) {
         reset(soft: true)
         _playWhenReady = playWhenReady
         _state = .loading
@@ -165,12 +169,13 @@ class AVPlayerWrapper: AVPlayerWrapperProtocol {
     // MARK: - Util
     
     private func reset(soft: Bool) {
+        playerItemObserver.stopObservingCurrentItem()
+        playerTimeObserver.unregisterForBoundaryTimeEvents()
+        playerItemNotificationObserver.stopObservingCurrentItem()
+        
         if !soft {
             avPlayer.replaceCurrentItem(with: nil)
         }
-        
-        playerTimeObserver.unregisterForBoundaryTimeEvents()
-        playerItemNotificationObserver.stopObservingCurrentItem()
     }
     
 }

SwiftAudio/Classes/AVPlayerWrapper/AVPlayerWrapperProtocol.swift

@@ -21,8 +21,8 @@ protocol AVPlayerWrapperProtocol {
     
     var reasonForWaitingToPlay: AVPlayer.WaitingReason? { get }
     
-    var rate: Float { get set }
     
+    var rate: Float { get set }
     
     var delegate: AVPlayerWrapperDelegate? { get set }
     
@@ -35,7 +35,7 @@ protocol AVPlayerWrapperProtocol {
     var isMuted: Bool { get set }
     
     var automaticallyWaitsToMinimizeStalling: Bool { get set }
-    
+        
     
     func play()
     

SwiftAudio/Classes/AudioItem.swift

@@ -20,14 +20,19 @@ public protocol AudioItem {
     func getTitle() -> String?
     func getAlbumTitle() -> String?
     func getSourceType() -> SourceType
-    func getPitchAlgorithmType() -> AVAudioTimePitchAlgorithm
     func getArtwork(_ handler: @escaping (UIImage?) -> Void)
     
 }
 
-public struct DefaultAudioItem: AudioItem {
+/// Make your `AudioItem`-subclass conform to this protocol to control which AVAudioTimePitchAlgorithm is used for each item.
+public protocol TimePitching {
     
+    func getPitchAlgorithmType() -> AVAudioTimePitchAlgorithm
+    
+}
 
+public class DefaultAudioItem: AudioItem {
+    
     public var audioUrl: String
     
     public var artist: String?
@@ -38,17 +43,14 @@ public struct DefaultAudioItem: AudioItem {
     
     public var sourceType: SourceType
     
-    public var pitchAlgorithmType: AVAudioTimePitchAlgorithm
-    
     public var artwork: UIImage?
     
-    public init(audioUrl: String, artist: String? = nil, title: String? = nil, albumTitle: String? = nil, sourceType: SourceType, pitchAlgorithmType: AVAudioTimePitchAlgorithm, artwork: UIImage? = nil) {
+    public init(audioUrl: String, artist: String? = nil, title: String? = nil, albumTitle: String? = nil, sourceType: SourceType, artwork: UIImage? = nil) {
         self.audioUrl = audioUrl
         self.artist = artist
         self.title = title
         self.albumTitle = albumTitle
         self.sourceType = sourceType
-        self.pitchAlgorithmType = pitchAlgorithmType
         self.artwork = artwork
     }
     
@@ -71,13 +73,29 @@ public struct DefaultAudioItem: AudioItem {
     public func getSourceType() -> SourceType {
         return sourceType
     }
-    
-    public func getPitchAlgorithmType() -> AVAudioTimePitchAlgorithm {
-        return pitchAlgorithmType
-    }
-    
+
     public func getArtwork(_ handler: @escaping (UIImage?) -> Void) {
         handler(artwork)
     }
     
 }
+
+/// An AudioItem that also conforms to the `TimePitching`-protocol
+public class DefaultAudioItemTimePitching: DefaultAudioItem, TimePitching {
+    
+    public var pitchAlgorithmType: AVAudioTimePitchAlgorithm
+    
+    public override init(audioUrl: String, artist: String?, title: String?, albumTitle: String?, sourceType: SourceType, artwork: UIImage?) {
+        self.pitchAlgorithmType = AVAudioTimePitchAlgorithm.lowQualityZeroLatency
+        super.init(audioUrl: audioUrl, artist: artist, title: title, albumTitle: albumTitle, sourceType: sourceType, artwork: artwork)
+    }
+    
+    public init(audioUrl: String, artist: String?, title: String?, albumTitle: String?, sourceType: SourceType, artwork: UIImage?, audioTimePitchAlgorithm: AVAudioTimePitchAlgorithm) {
+        self.pitchAlgorithmType = audioTimePitchAlgorithm
+        super.init(audioUrl: audioUrl, artist: artist, title: title, albumTitle: albumTitle, sourceType: sourceType, artwork: artwork)
+    }
+    
+    public func getPitchAlgorithmType() -> AVAudioTimePitchAlgorithm {
+        return pitchAlgorithmType
+    }
+}

SwiftAudio/Classes/AudioPlayer.swift

@@ -28,7 +28,12 @@ public protocol AudioPlayerDelegate: class {
 
 public class AudioPlayer: AVPlayerWrapperDelegate {
     
-    private var wrapper: AVPlayerWrapperProtocol
+    private var _wrapper: AVPlayerWrapperProtocol
+    
+    /// The wrapper around the underlying AVPlayer
+    var wrapper: AVPlayerWrapperProtocol {
+        return _wrapper
+    }
     
     public let nowPlayingInfoController: NowPlayingInfoController
     public let remoteCommandController: RemoteCommandController
@@ -44,6 +49,12 @@ public class AudioPlayer: AVPlayerWrapperDelegate {
      */
     public var automaticallyUpdateNowPlayingInfo: Bool = true
     
+    /**
+     Controls the time pitch algorithm applied to each item loaded into the player.
+     If the loaded `AudioItem` conforms to `TimePitcher`-protocol this will be overriden.
+     */
+    public var audioTimePitchAlgorithm: AVAudioTimePitchAlgorithm = AVAudioTimePitchAlgorithm.lowQualityZeroLatency
+    
     /**
      Default remote commands to use for each playing item
      */
@@ -84,7 +95,7 @@ public class AudioPlayer: AVPlayerWrapperDelegate {
      */
     public var bufferDuration: TimeInterval {
         get { return wrapper.bufferDuration }
-        set { wrapper.bufferDuration = newValue }
+        set { _wrapper.bufferDuration = newValue }
     }
     
     /**
@@ -92,7 +103,7 @@ public class AudioPlayer: AVPlayerWrapperDelegate {
      */
     public var timeEventFrequency: TimeEventFrequency {
         get { return wrapper.timeEventFrequency }
-        set { wrapper.timeEventFrequency = newValue }
+        set { _wrapper.timeEventFrequency = newValue }
     }
     
     /**
@@ -100,22 +111,22 @@ public class AudioPlayer: AVPlayerWrapperDelegate {
      */
     public var automaticallyWaitsToMinimizeStalling: Bool {
         get { return wrapper.automaticallyWaitsToMinimizeStalling }
-        set { wrapper.automaticallyWaitsToMinimizeStalling = newValue }
+        set { _wrapper.automaticallyWaitsToMinimizeStalling = newValue }
     }
     
     public var volume: Float {
         get { return wrapper.volume }
-        set { wrapper.volume = newValue }
+        set { _wrapper.volume = newValue }
     }
     
     public var isMuted: Bool {
         get { return wrapper.isMuted }
-        set { wrapper.isMuted = newValue }
+        set { _wrapper.isMuted = newValue }
     }
 
     public var rate: Float {
         get { return wrapper.rate }
-        set { wrapper.rate = newValue }
+        set { _wrapper.rate = newValue }
     }
     
     // MARK: - Init
@@ -128,11 +139,11 @@ public class AudioPlayer: AVPlayerWrapperDelegate {
     public init(avPlayer: AVPlayer = AVPlayer(),
                 nowPlayingInfoController: NowPlayingInfoController = NowPlayingInfoController(),
                 remoteCommandController: RemoteCommandController = RemoteCommandController()) {
-        self.wrapper = AVPlayerWrapper(avPlayer: avPlayer)
+        self._wrapper = AVPlayerWrapper(avPlayer: avPlayer)
         self.nowPlayingInfoController = nowPlayingInfoController
         self.remoteCommandController = remoteCommandController
         
-        self.wrapper.delegate = self
+        self._wrapper.delegate = self
         self.remoteCommandController.audioPlayer = self
     }
     
@@ -158,7 +169,12 @@ public class AudioPlayer: AVPlayerWrapperDelegate {
             wrapper.load(from: URL(fileURLWithPath: item.getSourceUrl()), playWhenReady: playWhenReady)
         }
         
-        wrapper.currentItem?.audioTimePitchAlgorithm = item.getPitchAlgorithmType()
+        if let item = item as? TimePitching {
+            wrapper.currentItem?.audioTimePitchAlgorithm = item.getPitchAlgorithmType()
+        }
+        else {
+            wrapper.currentItem?.audioTimePitchAlgorithm = audioTimePitchAlgorithm
+        }
         
         self._currentItem = item
         self.updateMetaValues(item: item)
@@ -259,7 +275,7 @@ public class AudioPlayer: AVPlayerWrapperDelegate {
     
     // MARK: - Private
     
-    private func reset() {
+    func reset() {
         self._currentItem = nil
     }
     

SwiftAudio/Classes/Observer/AVPlayerItemObserver.swift

@@ -27,6 +27,7 @@ class AVPlayerItemObserver: NSObject {
     
     private struct AVPlayerItemKeyPath {
         static let duration = #keyPath(AVPlayerItem.duration)
+        static let loadedTimeRanges = #keyPath(AVPlayerItem.loadedTimeRanges)
     }
     
     var isObserving: Bool = false
@@ -53,11 +54,13 @@ class AVPlayerItemObserver: NSObject {
             self.isObserving = true
             self.observingItem = item
             item.addObserver(self, forKeyPath: AVPlayerItemKeyPath.duration, options: [.new], context: &AVPlayerItemObserver.context)
+            item.addObserver(self, forKeyPath: AVPlayerItemKeyPath.loadedTimeRanges, options: [.new], context: &AVPlayerItemObserver.context)
         }
     }
     
-    private func stopObservingCurrentItem() {
+    func stopObservingCurrentItem() {
         observingItem?.removeObserver(self, forKeyPath: AVPlayerItemKeyPath.duration, context: &AVPlayerItemObserver.context)
+        observingItem?.removeObserver(self, forKeyPath: AVPlayerItemKeyPath.loadedTimeRanges, context: &AVPlayerItemObserver.context)
         self.isObserving = false
         self.observingItem = nil
     }
@@ -73,8 +76,12 @@ class AVPlayerItemObserver: NSObject {
             if let duration = change?[.newKey] as? CMTime {
                 self.delegate?.item(didUpdateDuration: duration.seconds)
             }
-        default:
-            break
+        
+        case AVPlayerItemKeyPath.loadedTimeRanges:
+            if let ranges = change?[.newKey] as? [NSValue], let duration = ranges.first?.timeRangeValue.duration {
+                self.delegate?.item(didUpdateDuration: duration.seconds)
+            }
+        default: break
             
         }
     }

SwiftAudio/Classes/QueueManager.swift

@@ -203,9 +203,20 @@ class QueueManager<T> {
         
         self._items[_currentIndex] = item
     }
+    
+    /**
+     Remove all previous items in the queue.
+     If no previous items exist, no action will be taken.
+     */
+    public func removePreviousItems() {
+        guard currentIndex > 0 else { return }
+        _items.removeSubrange(0..<_currentIndex)
+        _currentIndex = 0
+    }
 
     /**
      Remove upcoming items.
+     If no upcoming items exist, no action will be taken.
      */
     public func removeUpcomingItems() {
         let nextIndex = _currentIndex + 1

SwiftAudio/Classes/QueuedAudioPlayer.swift

@@ -30,6 +30,9 @@ public class QueuedAudioPlayer: AudioPlayer {
      */
     public override func stop() {
         super.stop()
+    }
+    
+    override func reset() {
         queueManager.clearQueue()
     }
     
@@ -158,6 +161,13 @@ public class QueuedAudioPlayer: AudioPlayer {
         queueManager.removeUpcomingItems()
     }
     
+    /**
+     Remove all previous items, those returned by `previous()`
+     */
+    public func removePreviousItems() {
+        queueManager.removePreviousItems()
+    }
+    
     // MARK: - AVPlayerWrapperDelegate
     
     override func AVWrapper(itemPlaybackDoneWithReason reason: PlaybackEndedReason) {