| /* |
| * 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 <stdbool.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_search_intra_uv_modes_in_interframe() |
| */ |
| /**@{*/ |
| 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 */ |
| uint8_t 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 */ |
| /**@}*/ |
| } IntraModeSearchState; |
| |
| /*!\brief Evaluate a given luma intra-mode for inter frames. |
| * |
| * \ingroup intra_mode_search |
| * \callgraph |
| * \callergraph |
| * This function handles an intra-mode luma prediction when the current frame |
| * is an inter frame. This is the intra-mode counterpart of handle_inter_mode. |
| * This function performs an intra luma prediction using the mode specified by |
| * x->e_mbd.mi[0]->mode. This function does *not* support palette mode |
| * prediction in the luma channel. |
| * |
| * \param[in,out] intra_search_state Structure to intra search state. |
| * \param[in] cpi Top-level encoder structure. |
| * \param[in,out] 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 tx_type and txfm_skip arrays. |
| * \param[out] rd_stats_y Struct to keep track of the current |
| * intra-mode's rd_stats (luma only). |
| * \param[in] best_rd Best RD seen for this block so far. |
| * \param[out] mode_cost_y The cost needed to signal the current |
| * intra mode. |
| * \param[out] rd_y The rdcost of the chosen mode. |
| * \param[in] best_model_rd Best model RD seen for this block so far |
| * \param[in] top_intra_model_rd Top intra model RD seen for this |
| * block so far. |
| * |
| * \return Returns 1 if a valid intra mode is found, 0 otherwise. |
| * The corresponding values in x->e_mbd.mi[0], rd_stats_y, mode_cost_y, and |
| * rd_y are also updated. Moreover, in the first evaluation with directional |
| * mode, a prune_mask computed with histogram of gradient is also stored in |
| * intra_search_state. |
| */ |
| int av1_handle_intra_y_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_y, |
| int64_t best_rd, int *mode_cost_y, int64_t *rd_y, |
| int64_t *best_model_rd, |
| int64_t top_intra_model_rd[]); |
| |
| /*!\brief Search through all chroma intra-modes for inter frames. |
| * |
| * \ingroup intra_mode_search |
| * \callgraph |
| * \callergraph |
| * This function handles intra-mode chroma prediction when the current frame |
| * is an inter frame. This is done by calling \ref av1_rd_pick_intra_sbuv_mode |
| * with some additional book-keeping. |
| * |
| * \param[in,out] intra_search_state Structure to intra search state. |
| * \param[in] cpi Top-level encoder structure. |
| * \param[in,out] x Pointer to structure holding all the |
| * data for the current macroblock. |
| * \param[in] bsize Current partition block size. |
| * \param[out] rd_stats Struct to keep track of the current |
| * intra-mode's rd_stats (all planes). |
| * \param[out] rd_stats_y Struct to keep track of the current |
| * intra-mode's rd_stats (luma only). |
| * \param[out] 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. |
| * |
| * \return Returns 1 if a valid intra mode is found, 0 otherwise. |
| * The corresponding values in x->e_mbd.mi[0], rd_stats(_y|_uv) 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. |
| */ |
| int av1_search_intra_uv_modes_in_interframe( |
| IntraModeSearchState *intra_search_state, const AV1_COMP *cpi, |
| MACROBLOCK *x, BLOCK_SIZE bsize, RD_STATS *rd_stats, |
| const RD_STATS *rd_stats_y, RD_STATS *rd_stats_uv, int64_t best_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. |
| * |
| * \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 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. |
| * |
| * \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. |
| */ |
| void av1_search_palette_mode_luma(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, uint8_t *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, uint8_t *skippable, |
| BLOCK_SIZE bsize, TX_SIZE max_tx_size); |
| |
| /*! \brief Return the number of colors in src. Used by palette mode. |
| */ |
| void av1_count_colors(const uint8_t *src, int stride, int rows, int cols, |
| int *val_count, int *num_colors); |
| |
| /*! \brief See \ref av1_count_colors(), but for highbd. |
| */ |
| void av1_count_colors_highbd(const uint8_t *src8, int stride, int rows, |
| int cols, int bit_depth, int *val_count, |
| int *val_count_8bit, int *num_color_bins, |
| int *num_colors); |
| |
| /*! \brief Set \a *num_colors to the number of colors in src. |
| |
| Exits early if the number of colors exceeds a specified threshold. |
| Used by screen content detection mode 2. |
| \return Returns true if the number of colors does not exceed the threshold. |
| \note If the function returns true, \a *num_colors is accurate (and is <= |
| \a num_colors_threshold). If the function returns false, the function exited |
| early, and \a *num_colors may be smaller than the actual number of colors |
| (and is > \a num_colors_threshold). |
| */ |
| bool av1_count_colors_with_threshold(const uint8_t *src, int stride, int rows, |
| int cols, int num_colors_threshold, |
| int *num_colors); |
| |
| /*! \brief Initializes the \ref IntraModeSearchState struct. |
| */ |
| static inline void init_intra_mode_search_state( |
| IntraModeSearchState *intra_search_state) { |
| memset(intra_search_state, 0, sizeof(*intra_search_state)); |
| intra_search_state->rate_uv_intra = INT_MAX; |
| } |
| |
| /*! \brief set the luma intra mode and delta angles for a given mode index. |
| * |
| * The total number of luma intra mode is LUMA_MODE_COUNT = 61. |
| * The first 13 modes are from DC_PRED to PAETH_PRED, followed by directional |
| * modes. Each of the main 8 directional modes have 6 = MAX_ANGLE_DELTA * 2 |
| * delta angles. |
| * \param[in] mode_idx mode index in intra mode decision |
| * process. |
| * \param[in] mbmi Pointer to structure holding the mode |
| * info for the current macroblock. |
| * \param[in] reorder_delta_angle_eval Indicates whether to reorder the |
| * evaluation of delta angle modes. |
| */ |
| void set_y_mode_and_delta_angle(const int mode_idx, MB_MODE_INFO *const mbmi, |
| int reorder_delta_angle_eval); |
| #ifdef __cplusplus |
| } // extern "C" |
| #endif |
| |
| #endif // AOM_AV1_ENCODER_INTRA_MODE_SEARCH_H_ |
