1 /* 2 * Copyright 2019 The libgav1 Authors 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef LIBGAV1_SRC_DSP_CONSTANTS_H_ 18 #define LIBGAV1_SRC_DSP_CONSTANTS_H_ 19 20 // This file contains DSP related constants that have a direct relationship with 21 // a DSP component. 22 23 #include <cstdint> 24 25 #include "src/utils/constants.h" 26 27 namespace libgav1 { 28 29 enum { 30 // Documentation variables. 31 kBitdepth8 = 8, 32 kBitdepth10 = 10, 33 kBitdepth12 = 12, 34 // Weights are quadratic from '1' to '1 / block_size', scaled by 35 // 2^kSmoothWeightScale. 36 kSmoothWeightScale = 8, 37 kCflLumaBufferStride = 32, 38 // InterRound0, Section 7.11.3.2. 39 kInterRoundBitsHorizontal = 3, // 8 & 10-bit. 40 kInterRoundBitsHorizontal12bpp = 5, 41 kInterRoundBitsCompoundVertical = 7, // 8, 10 & 12-bit compound prediction. 42 kInterRoundBitsVertical = 11, // 8 & 10-bit, single prediction. 43 kInterRoundBitsVertical12bpp = 9, 44 // Offset applied to 10bpp and 12bpp predictors to allow storing them in 45 // uint16_t. Removed before blending. 46 kCompoundOffset = (1 << 14) + (1 << 13), 47 kCdefSecondaryTap0 = 2, 48 kCdefSecondaryTap1 = 1, 49 }; // anonymous enum 50 51 extern const int8_t kFilterIntraTaps[kNumFilterIntraPredictors][8][8]; 52 53 // Values in this enum can be derived as the sum of subsampling_x and 54 // subsampling_y (since subsampling_x == 0 && subsampling_y == 1 case is never 55 // allowed by the bitstream). 56 enum SubsamplingType : uint8_t { 57 kSubsamplingType444, // subsampling_x = 0, subsampling_y = 0. 58 kSubsamplingType422, // subsampling_x = 1, subsampling_y = 0. 59 kSubsamplingType420, // subsampling_x = 1, subsampling_y = 1. 60 kNumSubsamplingTypes 61 }; 62 63 extern const uint16_t kSgrScaleParameter[16][2]; 64 65 extern const uint8_t kCdefPrimaryTaps[2][2]; 66 67 extern const int8_t kCdefDirectionsPadded[12][2][2]; 68 69 } // namespace libgav1 70 71 #endif // LIBGAV1_SRC_DSP_CONSTANTS_H_ 72