Prepare quantization

src/ImageSharp/Formats/Heif/Av1/Av1BlockModeInfo.cs

@@ -12,5 +12,4 @@ internal class Av1BlockModeInfo
     public Av1PredictionMode PredictionMode { get; }
 
     public Av1PartitionType Partition { get; }
-
 }

src/ImageSharp/Formats/Heif/Av1/OpenBitstreamUnit/ObuPartitionInfo.cs

@@ -0,0 +1,8 @@
+// Copyright (c) Six Labors.
+// Licensed under the Six Labors Split License.
+
+namespace SixLabors.ImageSharp.Formats.Heif.Av1.OpenBitstreamUnit;
+
+internal class ObuPartitionInfo
+{
+}

src/ImageSharp/Formats/Heif/Av1/Transform/Av1InverseQuantizer.cs

@@ -8,8 +8,7 @@ namespace SixLabors.ImageSharp.Formats.Heif.Av1.Quantization;
 
 internal class Av1InverseQuantizer
 {
-
-    public int InverseQuantize(ObuSequenceHeader sequenceHeader, ObuFrameHeader frameHeader, ObuPartitionInfo part, Av1BlockModeInfo mode, int[] qCoefficients, Av1TransformMode txType, Av1TransformSize txSize, Av1Plane plane)
+    public static int InverseQuantize(ObuSequenceHeader sequenceHeader, ObuFrameHeader frameHeader, ObuPartitionInfo part, Av1BlockModeInfo mode, int[] qCoefficients, Av1TransformMode txType, Av1TransformSize txSize, Av1Plane plane)
     {
         return 0;
     }

src/ImageSharp/Formats/Heif/Av1/Transform/Av1TransformSize.cs

@@ -0,0 +1,30 @@
+// Copyright (c) Six Labors.
+// Licensed under the Six Labors Split License.
+
+namespace SixLabors.ImageSharp.Formats.Heif.Av1.Quantization;
+
+internal enum Av1TransformSize : byte
+{
+    Size4x4,
+    Size8x8,
+    Size16x16,
+    Size32x32,
+    Size64x64,
+    Size4x8,
+    Size8x4,
+    Size8x16,
+    Size16x8,
+    Size16x32,
+    Size32x16,
+    Size32x64,
+    Size64x32,
+    Size4x16,
+    Size16x4,
+    Size8x32,
+    Size32x8,
+    Size16x64,
+    Size64x16,
+    AllSizes,
+    SquareSizes = Size4x8,
+    Invalid = 255,
+}