Add listeners for timed metadata notifications

To receive notifications about tags in the manifest, register the appropriate event listener(s).

You can monitor timed metadata by listening for the following events, which notify your application of related activity:

• MediaPlayerItemEvent.ITEM_CREATED: The initial list of TimedMetadata objects is available after the MediaPlayerItem is created.

  This event notifies your application when this happens.

• MediaPlayerItemEvent.ITEM_UPDATED: For live/linear streams where the manifest/playlist refreshes periodically, additional custom tags might appear in the updated playlist/manifest, so additional TimedMetadata objects might be added to the MediaPlayerItem.timedMetadata property.

  This event notifies your application when this happens.

• TimedMetadataEvent.TIMED_METADATA_AVAILABLE: Each time a new TimedMetadata object is created, this event is dispatched by the MediaPlayer.

  This event is not dispatched for the TimedMetadata object created during the initialization phase.

1. Implement the appropriate listeners.

   private function onItemCreated(event:MediaPlayerItemEvent):void {
       var timedMetadataCollection:Vector.<TimedMetadata> = event.item.timedMetadata;
       // process the timed metadata collection
   }
   
   private function onItemUpdated(event:MediaPlayerItemEvent):void {
       var timedMetadataCollection:Vector.<TimedMetadata> = event.item.timedMetadata;
       // process the timed metadata collection
   }
   
   private function onTimedMetadataAvailable(event:TimedMetadataEvent):void {
       var timedMetadata:TimedMetadata = event.timedMetadata;
       // process timed metadata
   }
   

2. Register the event listeners.

   player.addEventListener(MediaPlayerItemEvent.ITEM_CREATED, onItemCreated);
   player.addEventListener(MediaPlayerItemEvent.ITEM_UPDATED, onItemUpdated);
   player.addEventListener(TimedMetadataEvent.TIMED_METADATA_AVAILABLE,
                           onTimedMetadataAvailable);
   

ID3 metadata are dispatched through the same TimedMetadataEvent.TIMED_METADATA_AVAILABLE. This should not cause any confusion, however, because you can use a TimedMetadata objtec’s type property to differentiate between TAG and ID3. For more information about ID3 tags, see ID3 tags.

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