Microsoft.PlayerFramework.Adaptive.HLS.HLSPlugin.Playlist_SegmentSwitched C# (CSharp) Method

    private async void Playlist_SegmentSwitched(object sender, IHLSSegmentSwitchEventArgs args)
    {
      await this.RefreshStateAsync();
      try
      {
        // only process if app selected 608 captions
        if (ClosedCaptionType.CC608Instream == this._CaptionType)
        {
          var toSegment = args.ToSegment;

          if (TrackType.AUDIO == toSegment.MediaType)
          {
            // no need to process audio track, as it will not contain 608 caption data
            return;
          }

          var payloads = toSegment.GetInbandCCUnits();

          // no data--nothing to process
          if (null == payloads)
            return;

          // raise the event to let listeners know that we have 608 data available
          if (null != Instream608CaptionsAvailable)
            this.Instream608CaptionsAvailable(this, EventArgs.Empty);

          // copy the data to a WinRT-compatible data structure
          var map = new Dictionary<ulong, IList<Byte>>();

          foreach (var payload in payloads)
          {
            //Debug.WriteLine("Found 608 payload data for timestamp: " + payload.Timestamp.ToString() + " ticks (" + (payload.Timestamp / 10000000.0).ToString() + " sec)" );
            var rawBytes = payload.GetPayload();
            if (null != rawBytes)
            {
              var bytes = new List<byte>(rawBytes);
              ulong key = (ulong)payload.Timestamp.Ticks;
              if (map.ContainsKey(key))
                map[key] = bytes;
              else
                map.Add(key, bytes);
            }
          }

          await this._MediaPlayer.Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
          {
            try
            {
              if (this._MediaPlayer.SelectedCaption != null)
              {
                // call this method on the selected caption object (if there is one)--this will in turn raise an 
                // event that the 608 caption plugin should be listening for...
                this._MediaPlayer.SelectedCaption.AugmentPayload(map, TimeSpan.Zero, TimeSpan.Zero);
              }

              // add the payload data to each caption object, in case it gets selected later
              foreach (var c in this._MediaPlayer.AvailableCaptions)
              {
                // make sure we have the queue ready--if not, create it
                var queue = c.Payload as Queue<Dictionary<ulong, IList<Byte>>>;
                if (null == queue)
                {
                  queue = new Queue<Dictionary<ulong, IList<Byte>>>();
                  c.Payload = queue;
                }

                // store the most recent data on the end of the queue
                queue.Enqueue(map);

                // but only keep the most recent three sets of data (as we could be as much as 30 seconds ahead)
                while (queue.Count > 3)
                  queue.Dequeue();
              }
            }
            catch { }
          });
        }
        else if (this._CaptionType == ClosedCaptionType.WebVTTSidecar && _WebVTTCaptions != null && _WebVTTCaptions.CurrentSubtitleId != null)
        {
          await this._MediaPlayer.Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, async () =>
          {
            try
            {
              await _WebVTTCaptions.DownloadAllSegmentsAsync(_WebVTTCaptions.CurrentSubtitleId, this._MediaPlayer.Position);
            }
            catch { }
          });
        }
      }

      catch  { }
    }