Subchannel interpretation code (nw)

RedBookPlayer.Models/Hardware/Karaoke/TileBlock.cs

@@ -0,0 +1,40 @@
+namespace RedBookPlayer.Models.Hardware.Karaoke
+{
+    /// <see cref="https://jbum.com/cdg_revealed.html"/>
+    internal class TileBlock
+    {
+        // Only lower 4 bits are used, mask with 0x0F
+        public byte Color0 { get; private set; }
+
+        // Only lower 4 bits are used, mask with 0x0F
+        public byte Color1 { get; private set; }
+
+        // Only lower 5 bits are used, mask with 0x1F
+        public byte Row { get; private set; }
+
+        // Only lower 6 bits are used, mask with 0x3F
+        public byte Column { get; private set; }
+
+        // Only lower 6 bits of each byte are used
+        public byte[] TilePixels { get; private set; } = new byte[12];
+
+        /// <summary>
+        /// Interpret subchannel packet data as Tile Block
+        /// </summary>
+        public TileBlock(byte[] bytes)
+        {
+            if(bytes == null || bytes.Length != 16)
+                return;
+
+            this.Color0 = (byte)(bytes[0] & 0x0F);
+            this.Color1 = (byte)(bytes[1] & 0x0F);
+            this.Row    = (byte)(bytes[2] & 0x1F);
+            this.Column = (byte)(bytes[3] & 0x3F);
+
+            for(int i = 0; i < 12; i++)
+            {
+                this.TilePixels[i] = (byte)(bytes[4 + i] & 0x3F);
+            }
+        }
+    }
+}