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Assets/AVProVideo/Runtime/Scripts/Internal/TextTrack.cs

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+using System.Collections;
+using System.Collections.Generic;
+using System.Text;
+
+//-----------------------------------------------------------------------------
+// Copyright 2015-2021 RenderHeads Ltd.  All rights reserved.
+//-----------------------------------------------------------------------------
+
+namespace RenderHeads.Media.AVProVideo
+{
+	public class TextCue
+	{
+		private TextCue() { }
+
+		internal TextCue(string text) 
+		{
+			Text = text;
+		}
+
+		public string Text { get; private set; }
+	}
+
+	public partial class BaseMediaPlayer : ITextTracks
+	{
+		protected TextCue _currentTextCue = null;
+		public TextCue				GetCurrentTextCue() { return _currentTextCue; }	// Returns null when there is no active text
+
+		protected bool UpdateTextCue(bool force = false)
+		{
+			bool result = false;
+			// Has it changed since the last 'tick'
+			if (force || InternalIsChangedTextCue())
+			{
+				_currentTextCue = null;
+				string text = InternalGetCurrentTextCue();
+				if (!string.IsNullOrEmpty(text))
+				{
+					_currentTextCue = new TextCue(text);
+				}
+				result = true;
+			}
+			return result;
+		}
+
+		internal abstract bool InternalIsChangedTextCue();
+		internal abstract string InternalGetCurrentTextCue();
+	}
+}