Subchannel interpretation code (nw)

RedBookPlayer.Models/Hardware/Karaoke/Scroll.cs

@@ -0,0 +1,34 @@
+using System;
+
+namespace RedBookPlayer.Models.Hardware.Karaoke
+{
+    /// <see cref="https://jbum.com/cdg_revealed.html"/>
+    internal class Scroll
+    {
+        // Only lower 4 bits are used, mask with 0x0F
+        public byte Color { get; private set; }
+
+        // Only lower 6 bits are used, mask with 0x3F
+        public byte HScroll { get; private set; }
+
+        // Only lower 6 bits are used, mask with 0x3F
+        public byte VScroll { get; private set; }
+
+        public byte[] Filler { get; private set; } = new byte[13];
+
+        /// <summary>
+        /// Interpret subchannel packet data as Scroll
+        /// </summary>
+        public Scroll(byte[] bytes)
+        {
+            if(bytes == null || bytes.Length != 16)
+                return;
+
+            this.Color      = (byte)(bytes[0] & 0x0F);
+            this.HScroll    = (byte)(bytes[1] & 0x3F);
+            this.VScroll    = (byte)(bytes[2] & 0x3F);
+
+            Array.Copy(bytes, 3,  this.Filler, 0, 13);
+        }
+    }
+}