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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_
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