| /* |
| * Copyright (c) 2017, Alliance for Open Media. All rights reserved |
| * |
| * This source code is subject to the terms of the BSD 2 Clause License and |
| * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License |
| * was not distributed with this source code in the LICENSE file, you can |
| * obtain it at www.aomedia.org/license/software. If the Alliance for Open |
| * Media Patent License 1.0 was not distributed with this source code in the |
| * PATENTS file, you can obtain it at www.aomedia.org/license/patent. |
| */ |
| |
| #ifndef AOM_AV1_ENCODER_ENCODETXB_H_ |
| #define AOM_AV1_ENCODER_ENCODETXB_H_ |
| |
| #include "config/aom_config.h" |
| |
| #include "av1/common/av1_common_int.h" |
| #include "av1/common/blockd.h" |
| #include "av1/common/txb_common.h" |
| #include "av1/encoder/block.h" |
| #include "av1/encoder/encoder.h" |
| #include "aom_dsp/bitwriter.h" |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /*!\cond */ |
| #define TXB_SKIP_CTX_MASK 15 |
| #define DC_SIGN_CTX_SHIFT 4 |
| #define DC_SIGN_CTX_MASK 3 |
| |
| typedef struct TxbInfo { |
| tran_low_t *qcoeff; |
| uint8_t *levels; // absolute values and clamped to 255. |
| tran_low_t *dqcoeff; |
| const tran_low_t *tcoeff; |
| const int16_t *dequant; |
| int shift; |
| TX_SIZE tx_size; |
| TX_SIZE txs_ctx; |
| TX_TYPE tx_type; |
| int bwl; |
| int width; |
| int height; |
| int eob; |
| int seg_eob; |
| const SCAN_ORDER *scan_order; |
| TXB_CTX *txb_ctx; |
| int64_t rdmult; |
| const qm_val_t *iqmatrix; |
| int tx_type_cost; |
| } TxbInfo; |
| |
| /*!\endcond */ |
| /*!\brief Allocate the memory resources for all the macro blocks in the current |
| * coding frame. |
| * \ingroup coefficient_coding |
| * |
| * Each macro block will need a \ref CB_COEFF_BUFFER to store information for |
| * rate-distortion optimization and entropy coding of transform coefficients. |
| * |
| * \param[in] cpi Top-level encoder structure |
| */ |
| void av1_alloc_txb_buf(AV1_COMP *cpi); |
| /*!\brief Free the memory resources for all the macro blocks in the current |
| * coding frame. |
| * \ingroup coefficient_coding |
| * |
| * See \ref av1_alloc_txb_buf and \ref CB_COEFF_BUFFER for more details. |
| * |
| * \param[in] cpi Top-level encoder structure |
| */ |
| void av1_free_txb_buf(AV1_COMP *cpi); |
| /*!\brief Compute the entropy cost of coding coefficients in a transform block. |
| * |
| * \ingroup coefficient_coding |
| * |
| * \param[in] x Pointer to structure holding the data for |
| the current encoding macroblock. |
| * \param[in] plane The index of the current plane. |
| * \param[in] block The index of the current transform block |
| in the |
| * macroblock. It's defined by number of 4x4 units that have been coded before |
| * the currernt transform block. |
| * \param[in] tx_size The transform size. |
| * \param[in] tx_type The transform type. |
| * \param[in] txb_ctx Context info for entropy coding transform |
| block |
| * skip flag (tx_skip) and the sign of DC coefficient (dc_sign). |
| * \param[in] reduced_tx_set_used Whether the transform type is chosen from |
| * a reduced set. |
| */ |
| int av1_cost_coeffs_txb(const MACROBLOCK *x, const int plane, const int block, |
| const TX_SIZE tx_size, const TX_TYPE tx_type, |
| const TXB_CTX *const txb_ctx, int reduced_tx_set_used); |
| |
| /*!\brief Estimate the entropy cost of coding a transform block using Laplacian |
| * distribution. |
| * |
| * \ingroup coefficient_coding |
| * |
| * This function compute the entropy costs of the end of block position (eob) |
| * and the transform type (tx_type) precisely. |
| * |
| * Then using \ref av1_cost_coeffs_txb_estimate to estimate the entropy costs |
| * of coefficients in the transform block. |
| * |
| * In the end, the function returns the sum of entropy costs of end of block |
| * position (eob), transform type (tx_type) and coefficients. |
| * |
| * Compared to \ref av1_cost_coeffs_txb, this function is much faster but less |
| * accurate. |
| * |
| * \param[in] x Pointer to structure holding the data for the |
| current encoding macroblock |
| * \param[in] plane The index of the current plane |
| * \param[in] block The index of the current transform block in the |
| * macroblock. It's defined by number of 4x4 units that have been coded before |
| * the currernt transform block |
| * \param[in] tx_size The transform size |
| * \param[in] tx_type The transform type |
| * \param[in] txb_ctx Context info for entropy coding transform block |
| * skip flag (tx_skip) and the sign of DC coefficient (dc_sign). |
| * \param[in] reduced_tx_set_used Whether the transform type is chosen from |
| * a reduced set. |
| * \param[in] adjust_eob Whether to adjust the end of block position |
| (eob) |
| * or not. |
| * \return int Estimated entropy cost of coding the transform |
| block. |
| */ |
| int av1_cost_coeffs_txb_laplacian(const MACROBLOCK *x, const int plane, |
| const int block, const TX_SIZE tx_size, |
| const TX_TYPE tx_type, |
| const TXB_CTX *const txb_ctx, |
| const int reduced_tx_set_used, |
| const int adjust_eob); |
| |
| /*!\brief Estimate the entropy cost of transform coefficients using Laplacian |
| * distribution. |
| * |
| * \ingroup coefficient_coding |
| * |
| * This function assumes each transform coefficient is of its own Laplacian |
| * distribution and the coefficient is the only observation of the Laplacian |
| * distribution. |
| * |
| * Based on that, each coefficient's coding cost can be estimated by computing |
| * the entropy of the corresponding Laplacian distribution. |
| * |
| * This function then return the sum of the estimated entropy cost for all |
| * coefficients in the transform block. |
| * |
| * Note that the entropy cost of end of block (eob) and transform type (tx_type) |
| * are not included. |
| * |
| * \param[in] x Pointer to structure holding the data for the |
| current encoding macroblock |
| * \param[in] plane The index of the current plane |
| * \param[in] block The index of the current transform block in the |
| * macroblock. It's defined by number of 4x4 units that have been coded before |
| * the currernt transform block |
| * \param[in] tx_size The transform size |
| * \param[in] tx_type The transform type |
| * \return int Estimated entropy cost of coefficients in the |
| * transform block. |
| */ |
| int av1_cost_coeffs_txb_estimate(const MACROBLOCK *x, const int plane, |
| const int block, const TX_SIZE tx_size, |
| const TX_TYPE tx_type); |
| |
| /*!\brief Write quantized coefficients in a transform block into bitstream using |
| * entropy coding. |
| * |
| * \ingroup coefficient_coding |
| * |
| * This function will write the quantized coefficients in a transform block into |
| * the bitstream using entropy coding. |
| * |
| * The coding steps are as follows. |
| * |
| * 1) Code the end of block position "eob", which is the scan index of the |
| * last non-zero coefficient plus one. |
| * |
| * 2) Code the lower magnitude level (<= COEFF_BASE_RANGE + NUM_BASE_LEVELS) |
| * for each coefficient in reversed scan order. |
| * |
| * 3) Code the sign and higher magnitude level |
| * (> COEFF_BASE_RANGE + NUM_BASE_LEVELS) in forward scan order. |
| * |
| * \param[in] cm Top-level structure shared by encoder and |
| * decoder |
| * \param[in] x Pointer to structure holding the data for the |
| current encoding macroblock |
| * \param[in] w Entropy coding write pointer |
| * \param[in] blk_row The row index of the current transform block |
| * in the macroblock. Each unit has 4 pixels in y plane |
| * \param[in] blk_col The col index of the current transform block |
| * in the macroblock. Each unit has 4 pixels in y plane |
| * \param[in] plane The index of the current plane |
| * \param[in] block The index of the current transform block in the |
| * macroblock. It's defined by number of 4x4 units that have been coded before |
| * the currernt transform block |
| * \param[in] tx_size The given transform size |
| */ |
| void av1_write_coeffs_txb(const AV1_COMMON *const cm, MACROBLOCK *const x, |
| aom_writer *w, int blk_row, int blk_col, int plane, |
| int block, TX_SIZE tx_size); |
| |
| /*!\brief Write quantized coefficients of all transform blocks in an intra |
| * macroblock into the bitstream using entropy coding. |
| * |
| * \ingroup coefficient_coding |
| * |
| * All transform blocks in the intra macroblock share the same transform size. |
| * |
| * This function use \ref av1_write_coeffs_txb() to code each transform block in |
| * raster order. |
| * |
| * \param[in] cm Top-level structure shared by encoder and |
| * decoder |
| * \param[in] x Pointer to structure holding the data for the |
| current encoding macroblock |
| * \param[in] w Entropy coding write pointer |
| * \param[in] bsize Block size of the current macroblock |
| */ |
| |
| void av1_write_intra_coeffs_mb(const AV1_COMMON *const cm, MACROBLOCK *x, |
| aom_writer *w, BLOCK_SIZE bsize); |
| |
| /*!\brief Pack the context info of the current transform block into an uint8_t. |
| * \ingroup coefficient_coding |
| * |
| * This context info will be collected and consolidated by its neighbor |
| * transform blocks for coding transform block skip flag (tx_skip) and |
| * the sign of DC coefficient (dc_sign). |
| * |
| * \param[in] qcoeff Buffer of quantized coefficients |
| * \param[in] scan_order Coding order of coefficients in the transform |
| * block |
| * \param[in] eob The scan index of last non-zero coefficient plus |
| * one |
| */ |
| uint8_t av1_get_txb_entropy_context(const tran_low_t *qcoeff, |
| const SCAN_ORDER *scan_order, int eob); |
| |
| /*!\brief Update the probability model (cdf) and the entropy context related to |
| * coefficient coding for all transform blocks in the intra macroblock. |
| * |
| * \ingroup coefficient_coding |
| * |
| * This function will go through each transform block in the intra macorblock |
| * and call \ref av1_update_and_record_txb_context to update the probability |
| * model and entropy context properly. |
| * |
| * \param[in] cpi Top-level encoder structure |
| * \param[in] td Top-level multithreading structure |
| * \param[in] dry_run Whether this is a dry run. |
| * \param[in] bsize Block size of the current macroblock |
| * \param[in] allow_update_cdf Allowed to update probability model (cdf) or |
| * not. |
| */ |
| void av1_update_intra_mb_txb_context(const AV1_COMP *cpi, ThreadData *td, |
| RUN_TYPE dry_run, BLOCK_SIZE bsize, |
| uint8_t allow_update_cdf); |
| |
| /*!\brief Update the probability model (cdf) and the entropy context related to |
| * coefficient coding for a transform block. |
| * |
| * \ingroup coefficient_coding |
| * |
| * There are regular mode and dry run for this funtion. |
| * |
| * Regular mode: |
| * |
| * The probability model (cdf) for each coding symbol in the |
| * transform block will be updated. |
| * |
| * The entropy context of this transform block will be updated. |
| * |
| * Dry run: |
| * |
| * The probability model update will be skipped. |
| * |
| * The entropy context of this transform block will be updated. |
| * |
| * \param[in] plane The index of the current plane. |
| * \param[in] block The index of the current transform block in the |
| * macroblock. It's defined by number of 4x4 units that have been coded before |
| * the currernt transform block. |
| * \param[in] blk_row The row index of the current transform block |
| * in the macroblock. Each unit has 4 pixels in y plane. |
| * \param[in] blk_col The col index of the current transform block |
| * in the macroblock. Each unit has 4 pixels in y plane. |
| * \param[in] plane_bsize Block size for this plane. When the video source |
| * uses chroma subsampling, the block size of UV planes will be smaller than the |
| * block size of Y plane. |
| * \param[in] tx_size The given transform size. |
| * \param[in] arg This parameter will be translated into |
| * tokenize_b_args, in which RUN_TYPE indicates using regular mode or dry run. |
| */ |
| void av1_update_and_record_txb_context(int plane, int block, int blk_row, |
| int blk_col, BLOCK_SIZE plane_bsize, |
| TX_SIZE tx_size, void *arg); |
| |
| /*!\brief Adjust the magnitude of quantized coefficients to achieve better |
| * rate-distortion (RD) trade-off. |
| * |
| * \ingroup coefficient_coding |
| * |
| * This function goes through each coefficient and greedily choose to lower |
| * the coefficient magnitude by 1 or not based on the RD score. |
| * |
| * The coefficients are processing in reversed scan order. |
| * |
| * Note that, the end of block position (eob) may change if the original last |
| * coefficient is lowered to zero. |
| * |
| * \param[in] cpi Top-level encoder structure |
| * \param[in] x Pointer to structure holding the data for the |
| current encoding macroblock |
| * \param[in] plane The index of the current plane |
| * \param[in] block The index of the current transform block in the |
| * \param[in] tx_size The transform size |
| * \param[in] tx_type The transform type |
| * \param[in] txb_ctx Context info for entropy coding transform block |
| * skip flag (tx_skip) and the sign of DC coefficient (dc_sign). |
| * \param[out] rate_cost The entropy cost of coding the transform block |
| * after adjustment of coefficients. |
| * \param[in] sharpness When sharpness == 1, the function will be less |
| * aggressive toward lowering the magnitude of coefficients. |
| * In this way, the transform block will contain more high-frequency |
| coefficients |
| * and therefore preserve the sharpness of the reconstructed block. |
| */ |
| int av1_optimize_txb_new(const struct AV1_COMP *cpi, MACROBLOCK *x, int plane, |
| int block, TX_SIZE tx_size, TX_TYPE tx_type, |
| const TXB_CTX *const txb_ctx, int *rate_cost, |
| int sharpness); |
| |
| /*!\brief Get the corresponding \ref CB_COEFF_BUFFER of the current macro block. |
| * |
| * \ingroup coefficient_coding |
| * |
| * The macroblock's location is described by mi_row and mi_col, row and column |
| * mi indexes in the coding frame. |
| * |
| * Each mi unit is a 4x4 pixel block. |
| * |
| * \param[in] cpi Top-level encoder structure. |
| * \param[in] mi_row Row mi index of the current transform block |
| * in the frame. |
| * \param[in] mi_col Column mi index of the current transform |
| * block in the frame. |
| * \return CB_COEFF_BUFFER* Pointer of \ref CB_COEFF_BUFFER associated |
| * to this macroblock. |
| */ |
| CB_COEFF_BUFFER *av1_get_cb_coeff_buffer(const struct AV1_COMP *cpi, int mi_row, |
| int mi_col); |
| |
| /*!\brief Returns the entropy cost associated with skipping the current |
| * transform block. |
| * |
| * \ingroup coefficient_coding |
| * |
| * \param[in] coeff_costs Table of entropy cost for coefficient coding. |
| * \param[in] txb_ctx Context info for entropy coding transform block |
| * skip flag (tx_skip) and the sign of DC coefficient (dc_sign). |
| * \param[in] plane The index of the current plane |
| * \param[in] tx_size The transform size |
| */ |
| static INLINE int av1_cost_skip_txb(const CoeffCosts *coeff_costs, |
| const TXB_CTX *const txb_ctx, int plane, |
| TX_SIZE tx_size) { |
| const TX_SIZE txs_ctx = get_txsize_entropy_ctx(tx_size); |
| const PLANE_TYPE plane_type = get_plane_type(plane); |
| const LV_MAP_COEFF_COST *const coeff_costs_ = |
| &coeff_costs->coeff_costs[txs_ctx][plane_type]; |
| return coeff_costs_->txb_skip_cost[txb_ctx->txb_skip_ctx][1]; |
| } |
| |
| /*!\cond */ |
| // These numbers are empirically obtained. |
| static const int plane_rd_mult[REF_TYPES][PLANE_TYPES] = { |
| { 17, 13 }, |
| { 16, 10 }, |
| }; |
| /*!\endcond */ |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif // AOM_AV1_ENCODER_ENCODETXB_H_ |
