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diff --git a/src/dsp/constants.h b/src/dsp/constants.h
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+/*
+ * Copyright 2019 The libgav1 Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LIBGAV1_SRC_DSP_CONSTANTS_H_
+#define LIBGAV1_SRC_DSP_CONSTANTS_H_
+
+// This file contains DSP related constants that have a direct relationship with
+// a DSP component.
+
+#include <cstdint>
+
+#include "src/utils/constants.h"
+
+namespace libgav1 {
+
+enum {
+  // Documentation variables.
+  kBitdepth8 = 8,
+  kBitdepth10 = 10,
+  kBitdepth12 = 12,
+  // Weights are quadratic from '1' to '1 / block_size', scaled by
+  // 2^kSmoothWeightScale.
+  kSmoothWeightScale = 8,
+  kCflLumaBufferStride = 32,
+  // InterRound0, Section 7.11.3.2.
+  kInterRoundBitsHorizontal = 3,  // 8 & 10-bit.
+  kInterRoundBitsHorizontal12bpp = 5,
+  kInterRoundBitsCompoundVertical = 7,  // 8, 10 & 12-bit compound prediction.
+  kInterRoundBitsVertical = 11,         // 8 & 10-bit, single prediction.
+  kInterRoundBitsVertical12bpp = 9,
+  // Offset applied to 10bpp and 12bpp predictors to allow storing them in
+  // uint16_t. Removed before blending.
+  kCompoundOffset = (1 << 14) + (1 << 13),
+  kCdefSecondaryTap0 = 2,
+  kCdefSecondaryTap1 = 1,
+};  // anonymous enum
+
+extern const int8_t kFilterIntraTaps[kNumFilterIntraPredictors][8][8];
+
+// Values in this enum can be derived as the sum of subsampling_x and
+// subsampling_y (since subsampling_x == 0 && subsampling_y == 1 case is never
+// allowed by the bitstream).
+enum SubsamplingType : uint8_t {
+  kSubsamplingType444,  // subsampling_x = 0, subsampling_y = 0.
+  kSubsamplingType422,  // subsampling_x = 1, subsampling_y = 0.
+  kSubsamplingType420,  // subsampling_x = 1, subsampling_y = 1.
+  kNumSubsamplingTypes
+};
+
+extern const uint16_t kSgrScaleParameter[16][2];
+
+extern const uint8_t kCdefPrimaryTaps[2][2];
+
+extern const int8_t kCdefDirectionsPadded[12][2][2];
+
+}  // namespace libgav1
+
+#endif  // LIBGAV1_SRC_DSP_CONSTANTS_H_