txb_rdopt.h (5596B)
1 /* 2 * Copyright (c) 2021, Alliance for Open Media. All rights reserved. 3 * 4 * This source code is subject to the terms of the BSD 2 Clause License and 5 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License 6 * was not distributed with this source code in the LICENSE file, you can 7 * obtain it at www.aomedia.org/license/software. If the Alliance for Open 8 * Media Patent License 1.0 was not distributed with this source code in the 9 * PATENTS file, you can obtain it at www.aomedia.org/license/patent. 10 */ 11 12 #ifndef AOM_AV1_ENCODER_TXB_RDOPT_H_ 13 #define AOM_AV1_ENCODER_TXB_RDOPT_H_ 14 15 #include "av1/common/blockd.h" 16 #include "av1/common/txb_common.h" 17 #include "av1/encoder/encoder.h" 18 19 #ifdef __cplusplus 20 extern "C" { 21 #endif 22 23 /*!\brief Adjust the magnitude of quantized coefficients to achieve better 24 * rate-distortion (RD) trade-off. 25 * 26 * \ingroup coefficient_coding 27 * 28 * This function goes through each coefficient and greedily choose to lower 29 * the coefficient magnitude by 1 or not based on the RD score. 30 * 31 * The coefficients are processing in reversed scan order. 32 * 33 * Note that, the end of block position (eob) may change if the original last 34 * coefficient is lowered to zero. 35 * 36 * \param[in] cpi Top-level encoder structure 37 * \param[in] x Pointer to structure holding the data for the 38 current encoding macroblock 39 * \param[in] plane The index of the current plane 40 * \param[in] block The index of the current transform block in the 41 * \param[in] tx_size The transform size 42 * \param[in] tx_type The transform type 43 * \param[in] txb_ctx Context info for entropy coding transform block 44 * skip flag (tx_skip) and the sign of DC coefficient (dc_sign). 45 * \param[out] rate_cost The entropy cost of coding the transform block 46 * after adjustment of coefficients. 47 * \param[in] sharpness When sharpness > 0, the function will be less 48 * aggressive towards lowering the magnitude of coefficients. 49 * In this way, the transform block will contain more high-frequency 50 * coefficients and therefore will preserve the sharpness of the reconstructed 51 * block. 52 */ 53 int av1_optimize_txb(const struct AV1_COMP *cpi, MACROBLOCK *x, int plane, 54 int block, TX_SIZE tx_size, TX_TYPE tx_type, 55 const TXB_CTX *const txb_ctx, int *rate_cost, 56 int sharpness); 57 58 /*!\brief Compute the entropy cost of coding coefficients in a transform block. 59 * 60 * \ingroup coefficient_coding 61 * 62 * \param[in] x Pointer to structure holding the data for 63 the current encoding macroblock. 64 * \param[in] plane The index of the current plane. 65 * \param[in] block The index of the current transform block 66 in the 67 * macroblock. It's defined by number of 4x4 units that have been coded before 68 * the currernt transform block. 69 * \param[in] tx_size The transform size. 70 * \param[in] tx_type The transform type. 71 * \param[in] txb_ctx Context info for entropy coding transform 72 block 73 * skip flag (tx_skip) and the sign of DC coefficient (dc_sign). 74 * \param[in] reduced_tx_set_used Whether the transform type is chosen from 75 * a reduced set. 76 */ 77 int av1_cost_coeffs_txb(const MACROBLOCK *x, const int plane, const int block, 78 const TX_SIZE tx_size, const TX_TYPE tx_type, 79 const TXB_CTX *const txb_ctx, int reduced_tx_set_used); 80 81 /*!\brief Estimate the entropy cost of coding a transform block using Laplacian 82 * distribution. 83 * 84 * \ingroup coefficient_coding 85 * 86 * This function compute the entropy costs of the end of block position (eob) 87 * and the transform type (tx_type) precisely. 88 * 89 * Then using av1_cost_coeffs_txb_estimate() (see av1/encoder/txb_rdopt.c) to 90 * estimate the entropy costs of coefficients in the transform block. 91 * 92 * In the end, the function returns the sum of entropy costs of end of block 93 * position (eob), transform type (tx_type) and coefficients. 94 * 95 * Compared to \ref av1_cost_coeffs_txb, this function is much faster but less 96 * accurate. 97 * 98 * \param[in] x Pointer to structure holding the data for the 99 current encoding macroblock 100 * \param[in] plane The index of the current plane 101 * \param[in] block The index of the current transform block in the 102 * macroblock. It's defined by number of 4x4 units that have been coded before 103 * the currernt transform block 104 * \param[in] tx_size The transform size 105 * \param[in] tx_type The transform type 106 * \param[in] txb_ctx Context info for entropy coding transform block 107 * skip flag (tx_skip) and the sign of DC coefficient (dc_sign). 108 * \param[in] reduced_tx_set_used Whether the transform type is chosen from 109 * a reduced set. 110 * \param[in] adjust_eob Whether to adjust the end of block position 111 (eob) 112 * or not. 113 * \return int Estimated entropy cost of coding the transform 114 block. 115 */ 116 int av1_cost_coeffs_txb_laplacian(const MACROBLOCK *x, const int plane, 117 const int block, const TX_SIZE tx_size, 118 const TX_TYPE tx_type, 119 const TXB_CTX *const txb_ctx, 120 const int reduced_tx_set_used, 121 const int adjust_eob); 122 #ifdef __cplusplus 123 } 124 #endif 125 126 #endif // AOM_AV1_ENCODER_TXB_RDOPT_H_