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+/*
+ *  Copyright (c) 2021 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef MODULES_VIDEO_CODING_UTILITY_VP9_CONSTANTS_H_
+#define MODULES_VIDEO_CODING_UTILITY_VP9_CONSTANTS_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include <string>
+
+namespace webrtc {
+
+// Number of frames that can be stored for future reference.
+constexpr size_t kVp9NumRefFrames = 8;
+// Number of frame contexts that can be store for future reference.
+constexpr size_t kVp9NumFrameContexts = 4;
+// Each inter frame can use up to 3 frames for reference.
+constexpr size_t kVp9RefsPerFrame = 3;
+// Number of values that can be decoded for mv_fr.
+constexpr size_t kVp9MvFrSize = 4;
+// Number of positions to search in motion vector prediction.
+constexpr size_t kVp9MvrefNeighbours = 8;
+// Number of contexts when decoding intra_mode .
+constexpr size_t kVp9BlockSizeGroups = 4;
+// Number of different block sizes used.
+constexpr size_t kVp9BlockSizes = 13;
+// Sentinel value to mark partition choices that are illegal.
+constexpr size_t kVp9BlockInvalid = 14;
+// Number of contexts when decoding partition.
+constexpr size_t kVp9PartitionContexts = 16;
+// Smallest size of a mode info block.
+constexpr size_t kVp9MiSize = 8;
+// Minimum  width  of a  tile  in  units  of  superblocks  (although tiles on
+// the right hand edge can be narrower).
+constexpr size_t kVp9MinTileWidth_B64 = 4;
+// Maximum width of a tile in units of superblocks.
+constexpr size_t kVp9MaxTileWidth_B64 = 64;
+// Number of motion vectors returned by find_mv_refs process.
+constexpr size_t kVp9MaxMvRefCandidates = 2;
+// Number of values that can be derived for ref_frame.
+constexpr size_t kVp9MaxRefFrames = 4;
+// Number of contexts for is_inter.
+constexpr size_t kVp9IsInterContexts = 4;
+// Number of contexts for comp_mode.
+constexpr size_t kVp9CompModeContexts = 5;
+// Number of contexts for single_ref and comp_ref.
+constexpr size_t kVp9RefContexts = 5;
+// Number of segments allowed in segmentation map.
+constexpr size_t kVp9MaxSegments = 8;
+// Index for quantizer segment feature.
+constexpr size_t kVp9SegLvlAlt_Q = 0;
+// Index for loop filter segment feature.
+constexpr size_t kVp9SegLvlAlt_L = 1;
+// Index for reference frame segment feature.
+constexpr size_t kVp9SegLvlRefFrame = 2;
+// Index for skip segment feature.
+constexpr size_t kVp9SegLvlSkip = 3;
+// Number of segment features.
+constexpr size_t kVp9SegLvlMax = 4;
+// Number of different plane types (Y or UV).
+constexpr size_t kVp9BlockTypes = 2;
+// Number of different prediction types (intra or inter).
+constexpr size_t kVp9RefTypes = 2;
+// Number of coefficient bands.
+constexpr size_t kVp9CoefBands = 6;
+// Number of contexts for decoding coefficients.
+constexpr size_t kVp9PrevCoefContexts = 6;
+// Number  of  coefficient  probabilities  that  are  directly transmitted.
+constexpr size_t kVp9UnconstrainedNodes = 3;
+// Number of contexts for transform size.
+constexpr size_t kVp9TxSizeContexts = 2;
+// Number of values for interp_filter.
+constexpr size_t kVp9SwitchableFilters = 3;
+// Number of contexts for interp_filter.
+constexpr size_t kVp9InterpFilterContexts = 4;
+// Number of contexts for decoding skip.
+constexpr size_t kVp9SkipContexts = 3;
+// Number of values for partition.
+constexpr size_t kVp9PartitionTypes = 4;
+// Number of values for tx_size.
+constexpr size_t kVp9TxSizes = 4;
+// Number of values for tx_mode.
+constexpr size_t kVp9TxModes = 5;
+// Inverse transform rows with DCT and columns with DCT.
+constexpr size_t kVp9DctDct = 0;
+// Inverse transform rows with DCT and columns with ADST.
+constexpr size_t kVp9AdstDct = 1;
+// Inverse transform rows with ADST and columns with DCT.
+constexpr size_t kVp9DctAdst = 2;
+// Inverse transform rows with ADST and columns with ADST.
+constexpr size_t kVp9AdstAdst = 3;
+// Number of values for y_mode.
+constexpr size_t kVp9MbModeCount = 14;
+// Number of values for intra_mode.
+constexpr size_t kVp9IntraModes = 10;
+// Number of values for inter_mode.
+constexpr size_t kVp9InterModes = 4;
+// Number of contexts for inter_mode.
+constexpr size_t kVp9InterModeContexts = 7;
+// Number of values for mv_joint.
+constexpr size_t kVp9MvJoints = 4;
+// Number of values for mv_class.
+constexpr size_t kVp9MvClasses = 11;
+// Number of values for mv_class0_bit.
+constexpr size_t kVp9Class0Size = 2;
+// Maximum number of bits for decoding motion vectors.
+constexpr size_t kVp9MvOffsetBits = 10;
+// Number of values allowed for a probability adjustment.
+constexpr size_t kVp9MaxProb = 255;
+// Number of different mode types for loop filtering.
+constexpr size_t kVp9MaxModeLfDeltas = 2;
+// Threshold at which motion vectors are considered large.
+constexpr size_t kVp9CompandedMvrefThresh = 8;
+// Maximum value used for loop filtering.
+constexpr size_t kVp9MaxLoopFilter = 63;
+// Number of bits of precision when scaling reference frames.
+constexpr size_t kVp9RefScaleShift = 14;
+// Number of bits of precision when performing inter prediction.
+constexpr size_t kVp9SubpelBits = 4;
+// 1 << kVp9SubpelBits.
+constexpr size_t kVp9SubpelShifts = 16;
+// kVp9SubpelShifts - 1.
+constexpr size_t kVp9SubpelMask = 15;
+// Value used when clipping motion vectors.
+constexpr size_t kVp9MvBorder = 128;
+// Value used when clipping motion vectors.
+constexpr size_t kVp9InterpExtend = 4;
+// Value used when clipping motion vectors.
+constexpr size_t kVp9Borderinpixels = 160;
+// Value used in adapting probabilities.
+constexpr size_t kVp9MaxUpdateFactor = 128;
+// Value used in adapting probabilities.
+constexpr size_t kVp9CountSat = 20;
+// Both candidates use ZEROMV.
+constexpr size_t kVp9BothZero = 0;
+// One  candidate uses ZEROMV, one uses NEARMV or NEARESTMV.
+constexpr size_t kVp9ZeroPlusPredicted = 1;
+// Both candidates use NEARMV or NEARESTMV.
+constexpr size_t kVp9BothPredicted = 2;
+// One candidate uses NEWMV, one uses ZEROMV.
+constexpr size_t kVp9NewPlusNonIntra = 3;
+// Both candidates use NEWMV.
+constexpr size_t kVp9BothNew = 4;
+// One candidate uses intra prediction, one uses inter prediction.
+constexpr size_t kVp9IntraPlusNonIntra = 5;
+// Both candidates use intra prediction.
+constexpr size_t kVp9BothIntra = 6;
+// Sentinel value marking a case that can never occur.
+constexpr size_t kVp9InvalidCase = 9;
+
+enum class Vp9TxMode : uint8_t {
+  kOnly4X4 = 0,
+  kAllow8X8 = 1,
+  kAllow16x16 = 2,
+  kAllow32x32 = 3,
+  kTxModeSelect = 4
+};
+
+enum Vp9BlockSize : uint8_t {
+  kBlock4X4 = 0,
+  kBlock4X8 = 1,
+  kBlock8X4 = 2,
+  kBlock8X8 = 3,
+  kBlock8X16 = 4,
+  kBlock16X8 = 5,
+  kBlock16X16 = 6,
+  kBlock16X32 = 7,
+  kBlock32X16 = 8,
+  kBlock32X32 = 9,
+  kBlock32X64 = 10,
+  kBlock64X32 = 11,
+  kBlock64X64 = 12
+};
+
+enum Vp9Partition : uint8_t {
+  kPartitionNone = 0,
+  kPartitionHorizontal = 1,
+  kPartitionVertical = 2,
+  kPartitionSplit = 3
+};
+
+enum class Vp9ReferenceMode : uint8_t {
+  kSingleReference = 0,
+  kCompoundReference = 1,
+  kReferenceModeSelect = 2,
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_VIDEO_CODING_UTILITY_VP9_CONSTANTS_H_