Expose subtitles

The TVSDK notifies your player client about the availability of internal AVAsset’s availableMediaCharacteristicsWithMediaSelectionOptions by using the PTMediaPlayerMediaSelectionOptionsAvailableNotification notification.

You can access the available subtitles through the PTMediaPlayerItem property’s subtitlesOptions.

To expose subtitles:

1. Register the client as a listener for the PTMediaPlayerMediaSelectionOptionsAvailableNotification notification.

   [[NSNotificationCenter defaultCenter]
     addObserver:self selector:@selector(onMediaPlayerItemMediaSelectionOptionsAvailable:)
     name:PTMediaPlayerMediaSelectionOptionsAvailableNotification object:self.player];
   

   When your client receives this notification, the subtitles are ready in the PTMediaPlayerItem.

2. Implement the onMediaPlayerItemMediaSelectionOptionsAvailable method similar to the following example:

   - (void) onMediaPlayerItemMediaSelectionOptionsAvailable:(NSNotification *) notification {
       NSArray* subtitlesOptions = self.player.currentItem.subtitlesOptions;
       NSArray* audioOptions = self.player.currentItem.audioOptions;
   }
   

   For information about alternate audio tracks, see Alternate Audio.

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