| /* |
| * Copyright (c) 2020, 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. |
| */ |
| |
| /*!\file |
| * \brief Declares high level functions to search through intra modes. |
| */ |
| #ifndef AOM_AV1_ENCODER_INTRA_MODE_SEARCH_H_ |
| #define AOM_AV1_ENCODER_INTRA_MODE_SEARCH_H_ |
| |
| #include "av1/encoder/encoder.h" |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /*! \brief Variables related to intra-mode search during inter frame coding. |
| * |
| * \ingroup intra_mode_search |
| * This is a set of variables used during intra-mode search for inter frames. |
| * This includes an histogram of gradient speed features and a cache of uv |
| * prediction to avoid repeated search of chroma prediction. |
| */ |
| typedef struct IntraModeSearchState { |
| /*! |
| * \brief The best luma intra-mode found so far |
| */ |
| PREDICTION_MODE best_intra_mode; |
| |
| /** \name Speed feature variables |
| * Variables to help with pruning some luma intra-modes during inter frame |
| * coding process. |
| */ |
| /**@{*/ |
| /*! |
| * \brief Whether to terminate all intra mode search. |
| */ |
| int skip_intra_modes; |
| /*! |
| * \brief Whether a directional mode is pruned. |
| */ |
| uint8_t directional_mode_skip_mask[INTRA_MODES]; |
| /*! |
| * \brief Whether \ref directional_mode_skip_mask is valid for pruning. |
| */ |
| int dir_mode_skip_mask_ready; |
| /**@}*/ |
| |
| /** \name Chroma mode search cache |
| * A cache of the best chroma prediction mode to avoid having to search for |
| * chroma predictions repeatedly in \ref av1_handle_intra_mode() |
| */ |
| /**@{*/ |
| int rate_uv_intra; /*!< \brief Total rate to transmit uv_mode */ |
| int rate_uv_tokenonly; /*!< \brief Rate transmit txfm tokens */ |
| int64_t dist_uvs; /*!< \brief Distortion of the uv_mode's recon */ |
| int skip_uvs; /*!< \brief Whether the uv txfm is skippable */ |
| UV_PREDICTION_MODE mode_uv; /*!< \brief The best uv mode */ |
| PALETTE_MODE_INFO pmi_uv; /*!< \brief Color map if mode_uv is palette */ |
| int8_t uv_angle_delta; /*!< \brief Angle delta if mode_uv directional */ |
| /**@}*/ |
| |
| /*! |
| * \brief Keep track of best intra rd for use in compound mode. |
| */ |
| int64_t best_pred_rd[REFERENCE_MODES]; |
| } IntraModeSearchState; |
| |
| /*!\brief Evaluate a given intra-mode for inter frames. |
| * |
| * \ingroup intra_mode_search |
| * \callgraph |
| * \callergraph |
| * This function handles an intra-mode prediction when the current frame is an |
| * inter frame. This is the intra-mode counterpart of handle_inter_mode. This |
| * function first performs an intra prediction using the mode specified by |
| * x->e_mbd.mi[0]->mode, then it searches over *all* available chroma intra |
| * predictions by calling av1_rd_pick_intra_sbuv_mode. To avoid repeated |
| * computation for chroma mode search, a cache of the best chroma mode and its |
| * rd statistics is kept in intra_search_state that is retrieved when |
| * av1_handle_intra_mode is called more than once. This function does *not* |
| * support palette mode prediction in the luma channel, but it does search for |
| * palette mode in the chroma channel. |
| * |
| * \param[in] intra_search_state Structure to hold the best luma intra mode |
| * and cache chroma prediction for speed up. |
| * \param[in] cpi Top-level encoder structure. |
| * \param[in] x Pointer to structure holding all the data |
| * for the current macroblock. |
| * \param[in] bsize Current partition block size. |
| * \param[in] ref_frame_cost The entropy cost for signaling that the |
| * current ref frame is an intra frame. |
| * \param[in] ctx Structure to hold the number of 4x4 blks to |
| * copy the tx_type and txfm_skip arrays. |
| * \param[in] rd_stats Struct to keep track of the current |
| * intra-mode's rd_stats. |
| * \param[in] rd_stats_y Struct to keep track of the current |
| * intra-mode's rd_stats (luma only). |
| * \param[in] rd_stats_uv Struct to keep track of the current |
| * intra-mode's rd_stats (chroma only). |
| * \param[in] best_rd Best RD seen for this block so far. |
| * \param[in] best_intra_rd Best intra RD seen for this block so far. |
| * |
| * \return Returns the rdcost of the current intra-mode if it's available, |
| * otherwise returns INT64_MAX. The corresponding values in x->e_mbd.mi[0], |
| * rd_stats, rd_stats_y/uv, and best_intra_rd are also updated. Moreover, in the |
| * first evocation of the function, the chroma intra mode result is cached in |
| * intra_search_state to be used in subsequent calls. In the first evaluation |
| * with directional mode, a prune_mask computed with histogram of gradient is |
| * also stored in intra_search_state. |
| */ |
| int64_t av1_handle_intra_mode(IntraModeSearchState *intra_search_state, |
| const AV1_COMP *cpi, MACROBLOCK *x, |
| BLOCK_SIZE bsize, unsigned int ref_frame_cost, |
| const PICK_MODE_CONTEXT *ctx, RD_STATS *rd_stats, |
| RD_STATS *rd_stats_y, RD_STATS *rd_stats_uv, |
| int64_t best_rd, int64_t *best_intra_rd); |
| |
| /*!\brief Evaluate luma palette mode for inter frames. |
| * |
| * \ingroup intra_mode_search |
| * \callergraph |
| * \callgraph |
| * This function handles luma palette mode when the current frame is an |
| * inter frame. This is similar to \ref av1_handle_intra_mode(), but is |
| * specialized for palette mode. See \ref av1_handle_intra_mode() for the |
| * details. |
| * |
| * \param[in] intra_search_state Structure to hold the best luma intra mode |
| * and cache chroma prediction for speed up. |
| * \param[in] cpi Top-level encoder structure. |
| * \param[in] x Pointer to structure holding all the data |
| * for the current macroblock. |
| * \param[in] bsize Current partition block size. |
| * \param[in] ref_frame_cost The entropy cost for signaling that the |
| * current ref frame is an intra frame. |
| * \param[in] ctx Structure to hold the number of 4x4 blks to |
| * copy the tx_type and txfm_skip arrays. |
| * \param[in] this_rd_cost Struct to keep track of palette mode's |
| * rd_stats. |
| * \param[in] best_rd Best RD seen for this block so far. |
| * |
| * \return Returns whether luma palette mode can skip the txfm. The |
| * corresponding mbmi, this_rd_costs, intra_search_state, and tx_type arrays in |
| * ctx are also updated. |
| */ |
| int av1_search_palette_mode(IntraModeSearchState *intra_search_state, |
| const AV1_COMP *cpi, MACROBLOCK *x, |
| BLOCK_SIZE bsize, unsigned int ref_frame_cost, |
| PICK_MODE_CONTEXT *ctx, RD_STATS *this_rd_cost, |
| int64_t best_rd); |
| |
| /*!\brief Perform intra-mode search on luma channels for intra frames. |
| * |
| * \ingroup intra_mode_search |
| * \callgraph |
| * \callergraph |
| * This function performs intra-mode search on the luma channel when the |
| * current frame is intra-only. This function does not search intrabc mode, |
| * but it does search palette and filter_intra. |
| * |
| * \param[in] cpi Top-level encoder structure. |
| * \param[in] x Pointer to structure holding all the data |
| * for the current macroblock. |
| * \param[in] rate The total rate needed to predict the current |
| * chroma block. |
| * \param[in] rate_tokenonly The rate without the cost of sending the |
| * prediction modes. |
| * chroma block. |
| * after the reconstruction. |
| * \param[in] distortion The chroma distortion of the best prediction |
| * after the reconstruction. |
| * \param[in] skippable Whether we can skip txfm process. |
| * \param[in] bsize Current partition block size. |
| * \param[in] best_rd Best RD seen for this block so far. |
| * \param[in] ctx Structure to hold the number of 4x4 blks to |
| * copy the tx_type and txfm_skip arrays. |
| * |
| * \return Returns the rd_cost if this function finds a mode better than |
| * best_rd, otherwise returns INT64_MAX. This also updates the mbmi, the rate |
| * and distortion, and the tx_type arrays in ctx. |
| */ |
| int64_t av1_rd_pick_intra_sby_mode(const AV1_COMP *const cpi, MACROBLOCK *x, |
| int *rate, int *rate_tokenonly, |
| int64_t *distortion, int *skippable, |
| BLOCK_SIZE bsize, int64_t best_rd, |
| PICK_MODE_CONTEXT *ctx); |
| |
| /*!\brief Perform intra-mode search on chroma channels. |
| * |
| * \ingroup intra_mode_search |
| * \callergraph |
| * \callgraph |
| * This function performs intra-mode search on the chroma channels. Just like |
| * \ref av1_rd_pick_intra_sby_mode(), this function searches over palette mode |
| * (filter_intra is not available on chroma planes). Unlike \ref |
| * av1_rd_pick_intra_sby_mode() this function is used by both inter and intra |
| * frames. |
| * |
| * \param[in] cpi Top-level encoder structure. |
| * \param[in] x Pointer to structure holding all the data |
| * for the current macroblock. |
| * \param[in] rate The total rate needed to predict the current |
| * chroma block. |
| * \param[in] rate_tokenonly The rate without the cost of sending the |
| * prediction modes. |
| * chroma block. |
| * after the reconstruction. |
| * \param[in] distortion The chroma distortion of the best prediction |
| * after the reconstruction. |
| * \param[in] skippable Whether we can skip txfm process. |
| * \param[in] bsize Current partition block size. |
| * \param[in] max_tx_size The maximum tx_size available |
| * |
| * \return Returns the rd_cost of the best uv mode found. This also updates the |
| * mbmi, the rate and distortion, distortion. |
| */ |
| int64_t av1_rd_pick_intra_sbuv_mode(const AV1_COMP *const cpi, MACROBLOCK *x, |
| int *rate, int *rate_tokenonly, |
| int64_t *distortion, int *skippable, |
| BLOCK_SIZE bsize, TX_SIZE max_tx_size); |
| |
| /*! \brief Return the number of colors in src. Used by palette mode. |
| */ |
| int av1_count_colors(const uint8_t *src, int stride, int rows, int cols, |
| int *val_count); |
| |
| /*! \brief See \ref av1_count_colors(), but for highbd. |
| */ |
| int av1_count_colors_highbd(const uint8_t *src8, int stride, int rows, int cols, |
| int bit_depth, int *val_count); |
| |
| #ifdef __cplusplus |
| } // extern "C" |
| #endif |
| |
| #endif // AOM_AV1_ENCODER_INTRA_MODE_SEARCH_H_ |
