Add metadata group menifest event (#480)

* Add metadata group observer and event

* update pod version to 3.30.1

Classes/Events/PlayerEvent.swift

@@ -17,9 +17,9 @@ import AVFoundation
     @objc public static let allEventTypes: [PlayerEvent.Type] = [
         canPlay, durationChanged, stopped, ended, loadedMetadata, play, pause, playing, seeking, seeked, replay,
         tracksAvailable, textTrackChanged, audioTrackChanged, videoTrackChanged, playbackInfo, stateChanged,
-        timedMetadata, sourceSelected, loadedTimeRanges, playheadUpdate, error, errorLog, playbackStalled, playbackRate
+        timedMetadata, sourceSelected, loadedTimeRanges, playheadUpdate, error, errorLog, playbackStalled, playbackRate,metadataGroups
     ]
-    
+
     // MARK: - Player Events Static Reference
 
     /// Sent when enough data is available that the media can be played, at least for a couple of frames.
@@ -58,6 +58,8 @@ import AVFoundation
     @objc public static let stateChanged: PlayerEvent.Type = StateChanged.self
     /// Sent when timed metadata is available.
     @objc public static let timedMetadata: PlayerEvent.Type = TimedMetadata.self
+    /// Sent when timed metadata Groups is available.
+    @objc public static let metadataGroups: PlayerEvent.Type = MetadataGroups.self
     /// Sent when source was selected.
     @objc public static let sourceSelected: PlayerEvent.Type = SourceSelected.self
     /// Sent when loaded time ranges was changed, loaded time ranges represent the buffered content.
@@ -137,6 +139,12 @@ import AVFoundation
         }
     }
 
+    public class MetadataGroups: PlayerEvent {
+        convenience init(metadata: [AVDateRangeMetadataGroup]) {
+            self.init([EventDataKeys.metadataGroup: metadata])
+        }
+    }
+
     public class TracksAvailable: PlayerEvent {
         convenience init(tracks: PKTracks) {
             self.init([EventDataKeys.tracks: tracks])

Classes/Player/AVPlayerEngine/AVPlayerEngine+AssetLoading.swift

@@ -37,6 +37,10 @@ extension AVPlayerEngine {
         metadataOutput.setDelegate(self, queue: DispatchQueue.main)
         playerItem.add(metadataOutput)
 
+        let metadataCollector = AVPlayerItemMetadataCollector()
+        metadataCollector.setDelegate(self, queue: DispatchQueue.main)
+        playerItem.add(metadataCollector)
+
         if #available(iOS 13.0, tvOS 13.0, *) {
             playerItem.automaticallyPreservesTimeOffsetFromLive = newAsset.playerSettings.lowLatency.automaticallyPreservesTimeOffsetFromLive
 
@@ -136,3 +140,13 @@ extension AVPlayerEngine: AVPlayerItemMetadataOutputPushDelegate {
         }
     }
 }
+
+extension AVPlayerEngine: AVPlayerItemMetadataCollectorPushDelegate {
+
+    public func metadataCollector(_ metadataCollector: AVPlayerItemMetadataCollector, 
+                                  didCollect metadataGroups: [AVDateRangeMetadataGroup],
+                                  indexesOfNewGroups: IndexSet,
+                                  indexesOfModifiedGroups: IndexSet) {
+        self.post(event: PlayerEvent.MetadataGroups(metadata: metadataGroups))
+    }
+}

Classes/Player/PKEvent.swift

@@ -51,6 +51,7 @@ public extension PKEvent {
         static let newState = "newState"
         static let error = "error"
         static let metadata = "metadata"
+        static let metadataGroup = "metadataGroup"
         static let mediaSource = "mediaSource"
         static let timeRanges = "timeRanges"
         static let bitrate = "bitrate"
@@ -135,6 +136,12 @@ public extension PKEvent {
         return self.data?[EventDataKeys.metadata] as? [AVMetadataItem]
     }
 
+    /// Associated metadata group from the event, PKEvent Metadata Group Accessor
+
+    @objc var metadataGroups: [AVDateRangeMetadataGroup]? {
+        return self.data?[EventDataKeys.metadataGroup] as? [AVDateRangeMetadataGroup]
+    }
+
     /// The MediaSource object, PKEvent Data Accessor
     @objc var mediaSource: PKMediaSource? {
         return self.data?[EventDataKeys.mediaSource] as? PKMediaSource

PlayKit.podspec

@@ -4,7 +4,7 @@ suffix = '.0000'   # Dev mode
 Pod::Spec.new do |s|
 
 s.name              = 'PlayKit'
-s.version           = '3.30.0' + suffix
+s.version           = '3.30.1' + suffix
 s.summary           = 'PlayKit: Kaltura Mobile Player SDK - iOS'
 s.homepage          = 'https://github.com/kaltura/playkit-ios'
 s.license           = { :type => 'AGPLv3', :text => 'AGPLv3' }