av1/encoder/mcomp.h

/*
 * Copyright (c) 2016, 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_MCOMP_H_
#define AOM_AV1_ENCODER_MCOMP_H_

#include "av1/common/mv.h"
#include "av1/encoder/block.h"
#include "av1/encoder/rd.h"

#include "aom_dsp/variance.h"

#ifdef __cplusplus
extern "C" {
#endif

struct AV1_COMP;
struct SPEED_FEATURES;

// =============================================================================
//  Cost functions
// =============================================================================

enum {
  MV_COST_ENTROPY,    // Use the entropy rate of the mv as the cost
  MV_COST_L1_LOWRES,  // Use the l1 norm of the mv as the cost (<480p)
  MV_COST_L1_MIDRES,  // Use the l1 norm of the mv as the cost (>=480p)
  MV_COST_L1_HDRES,   // Use the l1 norm of the mv as the cost (>=720p)
  MV_COST_NONE        // Use 0 as as cost irrespective of the current mv
} UENUM1BYTE(MV_COST_TYPE);

typedef struct {
  // The reference mv used to compute the mv cost
  const MV *ref_mv;
  FULLPEL_MV full_ref_mv;
  MV_COST_TYPE mv_cost_type;
  const int *mvjcost;
  const int *mvcost[2];
  int error_per_bit;
  // A multiplier used to convert rate to sad cost
  int sad_per_bit;
} MV_COST_PARAMS;

int av1_mv_bit_cost(const MV *mv, const MV *ref_mv, const int *mvjcost,
                    int *const mvcost[2], int weight);

int av1_get_mvpred_sse(const MV_COST_PARAMS *mv_cost_params,
                       const FULLPEL_MV best_mv,
                       const aom_variance_fn_ptr_t *vfp,
                       const struct buf_2d *src, const struct buf_2d *pre);
int av1_get_mvpred_compound_var(const MV_COST_PARAMS *ms_params,
                                const FULLPEL_MV best_mv,
                                const uint8_t *second_pred, const uint8_t *mask,
                                int mask_stride, int invert_mask,
                                const aom_variance_fn_ptr_t *vfp,
                                const struct buf_2d *src,
                                const struct buf_2d *pre);

// =============================================================================
//  Motion Search
// =============================================================================
typedef struct {
  // The reference buffer
  const struct buf_2d *ref;

  // The source and predictors/mask used by translational search
  const struct buf_2d *src;
  const uint8_t *second_pred;
  const uint8_t *mask;
  int mask_stride;
  int inv_mask;

  // The weighted source and mask used by OBMC
  const int32_t *wsrc;
  const int32_t *obmc_mask;
} MSBuffers;

static INLINE void av1_set_ms_compound_refs(MSBuffers *ms_buffers,
                                            const uint8_t *second_pred,
                                            const uint8_t *mask,
                                            int mask_stride, int invert_mask) {
  ms_buffers->second_pred = second_pred;
  ms_buffers->mask = mask;
  ms_buffers->mask_stride = mask_stride;
  ms_buffers->inv_mask = invert_mask;
}

// =============================================================================
//  Fullpixel Motion Search
// =============================================================================
// This struct holds fullpixel motion search parameters that should be constant
// during the search
typedef struct {
  BLOCK_SIZE bsize;
  // A function pointer to the simd function for fast computation
  const aom_variance_fn_ptr_t *vfp;

  MSBuffers ms_buffers;

  // WARNING: search_method should be regarded as a private variable and should
  // not be modified directly so it is in sync with search_sites. To modify it,
  // use av1_set_mv_search_method.
  SEARCH_METHODS search_method;
  const search_site_config *search_sites;
  FullMvLimits mv_limits;

  int run_mesh_search;    // Sets mesh search unless it got pruned by
                          // prune_mesh_search.
  int prune_mesh_search;  // Disables mesh search if the best_mv after a normal
                          // search if close to the start_mv.
  int mesh_search_mv_diff_threshold;  // mv diff threshold to enable
                                      // prune_mesh_search
  int force_mesh_thresh;  // Forces mesh search if the residue variance is
                          // higher than the threshold.
  const struct MESH_PATTERN *mesh_patterns[2];

  // Use maximum search interval of 4 if true. This helps motion search to find
  // the best motion vector for screen content types.
  int fine_search_interval;

  int is_intra_mode;

  int fast_obmc_search;

  // For calculating mv cost
  MV_COST_PARAMS mv_cost_params;

  // Stores the function used to compute the sad. This can be different from the
  // sdf in vfp (e.g. downsampled sad and not sad) to allow speed up.
  aom_sad_fn_t sdf;
  aom_sad_multi_d_fn_t sdx4df;
} FULLPEL_MOTION_SEARCH_PARAMS;

void av1_init_obmc_buffer(OBMCBuffer *obmc_buffer);

void av1_make_default_fullpel_ms_params(
    FULLPEL_MOTION_SEARCH_PARAMS *ms_params, const struct AV1_COMP *cpi,
    const MACROBLOCK *x, BLOCK_SIZE bsize, const MV *ref_mv,
    const search_site_config search_sites[NUM_DISTINCT_SEARCH_METHODS],
    int fine_search_interval);

/*! Sets the \ref FULLPEL_MOTION_SEARCH_PARAMS to intra mode. */
void av1_set_ms_to_intra_mode(FULLPEL_MOTION_SEARCH_PARAMS *ms_params,
                              const IntraBCMVCosts *dv_costs);

// Sets up configs for fullpixel DIAMOND / CLAMPED_DIAMOND search method.
void av1_init_dsmotion_compensation(search_site_config *cfg, int stride,
                                    int level);
// Sets up configs for firstpass motion search.
void av1_init_motion_fpf(search_site_config *cfg, int stride);
// Sets up configs for NSTEP / NSTEP_8PT motion search method.
void av1_init_motion_compensation_nstep(search_site_config *cfg, int stride,
                                        int level);
// Sets up configs for BIGDIA / FAST_DIAMOND / FAST_BIGDIA
// motion search method.
void av1_init_motion_compensation_bigdia(search_site_config *cfg, int stride,
                                         int level);
// Sets up configs for HEX or FAST_HEX motion search method.
void av1_init_motion_compensation_hex(search_site_config *cfg, int stride,
                                      int level);
// Sets up configs for SQUARE motion search method.
void av1_init_motion_compensation_square(search_site_config *cfg, int stride,
                                         int level);

/*! Function pointer to search site config initialization of different search
 * method functions. */
typedef void (*av1_init_search_site_config)(search_site_config *cfg, int stride,
                                            int level);

/*! Array of function pointer used to set the motion search config. */
static const av1_init_search_site_config
    av1_init_motion_compensation[NUM_DISTINCT_SEARCH_METHODS] = {
      av1_init_dsmotion_compensation,     av1_init_motion_compensation_nstep,
      av1_init_motion_compensation_nstep, av1_init_dsmotion_compensation,
      av1_init_motion_compensation_hex,   av1_init_motion_compensation_bigdia,
      av1_init_motion_compensation_square
    };

// Array to inform which all search methods are having
// same candidates and different in number of search steps.
static const SEARCH_METHODS search_method_lookup[NUM_SEARCH_METHODS] = {
  DIAMOND,          // DIAMOND
  NSTEP,            // NSTEP
  NSTEP_8PT,        // NSTEP_8PT
  CLAMPED_DIAMOND,  // CLAMPED_DIAMOND
  HEX,              // HEX
  BIGDIA,           // BIGDIA
  SQUARE,           // SQUARE
  HEX,              // FAST_HEX
  BIGDIA,           // FAST_DIAMOND
  BIGDIA,           // FAST_BIGDIA
  BIGDIA            // VFAST_DIAMOND
};

// Mv beyond the range do not produce new/different prediction block.
static INLINE void av1_set_mv_search_method(
    FULLPEL_MOTION_SEARCH_PARAMS *ms_params,
    const search_site_config search_sites[NUM_DISTINCT_SEARCH_METHODS],
    SEARCH_METHODS search_method) {
  ms_params->search_method = search_method;
  ms_params->search_sites =
      &search_sites[search_method_lookup[ms_params->search_method]];
}

// Set up limit values for MV components.
// Mv beyond the range do not produce new/different prediction block.
static INLINE void av1_set_mv_row_limits(
    const CommonModeInfoParams *const mi_params, FullMvLimits *mv_limits,
    int mi_row, int mi_height, int border) {
  const int min1 = -(mi_row * MI_SIZE + border - 2 * AOM_INTERP_EXTEND);
  const int min2 = -(((mi_row + mi_height) * MI_SIZE) + 2 * AOM_INTERP_EXTEND);
  mv_limits->row_min = AOMMAX(min1, min2);
  const int max1 = (mi_params->mi_rows - mi_row - mi_height) * MI_SIZE +
                   border - 2 * AOM_INTERP_EXTEND;
  const int max2 =
      (mi_params->mi_rows - mi_row) * MI_SIZE + 2 * AOM_INTERP_EXTEND;
  mv_limits->row_max = AOMMIN(max1, max2);
}

static INLINE void av1_set_mv_col_limits(
    const CommonModeInfoParams *const mi_params, FullMvLimits *mv_limits,
    int mi_col, int mi_width, int border) {
  const int min1 = -(mi_col * MI_SIZE + border - 2 * AOM_INTERP_EXTEND);
  const int min2 = -(((mi_col + mi_width) * MI_SIZE) + 2 * AOM_INTERP_EXTEND);
  mv_limits->col_min = AOMMAX(min1, min2);
  const int max1 = (mi_params->mi_cols - mi_col - mi_width) * MI_SIZE + border -
                   2 * AOM_INTERP_EXTEND;
  const int max2 =
      (mi_params->mi_cols - mi_col) * MI_SIZE + 2 * AOM_INTERP_EXTEND;
  mv_limits->col_max = AOMMIN(max1, max2);
}

static INLINE void av1_set_mv_limits(
    const CommonModeInfoParams *const mi_params, FullMvLimits *mv_limits,
    int mi_row, int mi_col, int mi_height, int mi_width, int border) {
  av1_set_mv_row_limits(mi_params, mv_limits, mi_row, mi_height, border);
  av1_set_mv_col_limits(mi_params, mv_limits, mi_col, mi_width, border);
}

void av1_set_mv_search_range(FullMvLimits *mv_limits, const MV *mv);

int av1_init_search_range(int size);

unsigned int av1_int_pro_motion_estimation(const struct AV1_COMP *cpi,
                                           MACROBLOCK *x, BLOCK_SIZE bsize,
                                           int mi_row, int mi_col,
                                           const MV *ref_mv);

int av1_refining_search_8p_c(const FULLPEL_MOTION_SEARCH_PARAMS *ms_params,
                             const FULLPEL_MV start_mv, FULLPEL_MV *best_mv);

int av1_full_pixel_search(const FULLPEL_MV start_mv,
                          const FULLPEL_MOTION_SEARCH_PARAMS *ms_params,
                          const int step_param, int *cost_list,
                          FULLPEL_MV *best_mv, FULLPEL_MV *second_best_mv);

int av1_intrabc_hash_search(const struct AV1_COMP *cpi, const MACROBLOCKD *xd,
                            const FULLPEL_MOTION_SEARCH_PARAMS *ms_params,
                            IntraBCHashInfo *intrabc_hash_info,
                            FULLPEL_MV *best_mv);

int av1_obmc_full_pixel_search(const FULLPEL_MV start_mv,
                               const FULLPEL_MOTION_SEARCH_PARAMS *ms_params,
                               const int step_param, FULLPEL_MV *best_mv);

static INLINE int av1_is_fullmv_in_range(const FullMvLimits *mv_limits,
                                         FULLPEL_MV mv) {
  return (mv.col >= mv_limits->col_min) && (mv.col <= mv_limits->col_max) &&
         (mv.row >= mv_limits->row_min) && (mv.row <= mv_limits->row_max);
}
// =============================================================================
//  Subpixel Motion Search
// =============================================================================
enum {
  EIGHTH_PEL,
  QUARTER_PEL,
  HALF_PEL,
  FULL_PEL
} UENUM1BYTE(SUBPEL_FORCE_STOP);

typedef struct {
  const aom_variance_fn_ptr_t *vfp;
  SUBPEL_SEARCH_TYPE subpel_search_type;
  // Source and reference buffers
  MSBuffers ms_buffers;
  int w, h;
} SUBPEL_SEARCH_VAR_PARAMS;

// This struct holds subpixel motion search parameters that should be constant
// during the search
typedef struct {
  // High level motion search settings
  int allow_hp;
  const int *cost_list;
  SUBPEL_FORCE_STOP forced_stop;
  int iters_per_step;
  SubpelMvLimits mv_limits;

  // For calculating mv cost
  MV_COST_PARAMS mv_cost_params;

  // Distortion calculation params
  SUBPEL_SEARCH_VAR_PARAMS var_params;
} SUBPEL_MOTION_SEARCH_PARAMS;

void av1_make_default_subpel_ms_params(SUBPEL_MOTION_SEARCH_PARAMS *ms_params,
                                       const struct AV1_COMP *cpi,
                                       const MACROBLOCK *x, BLOCK_SIZE bsize,
                                       const MV *ref_mv, const int *cost_list);

typedef int(fractional_mv_step_fp)(MACROBLOCKD *xd, const AV1_COMMON *const cm,
                                   const SUBPEL_MOTION_SEARCH_PARAMS *ms_params,
                                   MV start_mv, MV *bestmv, int *distortion,
                                   unsigned int *sse1,
                                   int_mv *last_mv_search_list);

extern fractional_mv_step_fp av1_find_best_sub_pixel_tree;
extern fractional_mv_step_fp av1_find_best_sub_pixel_tree_pruned;
extern fractional_mv_step_fp av1_find_best_sub_pixel_tree_pruned_more;
extern fractional_mv_step_fp av1_return_max_sub_pixel_mv;
extern fractional_mv_step_fp av1_return_min_sub_pixel_mv;
extern fractional_mv_step_fp av1_find_best_obmc_sub_pixel_tree_up;

unsigned int av1_refine_warped_mv(MACROBLOCKD *xd, const AV1_COMMON *const cm,
                                  const SUBPEL_MOTION_SEARCH_PARAMS *ms_params,
                                  BLOCK_SIZE bsize, const int *pts0,
                                  const int *pts_inref0, int total_samples);

static INLINE void av1_set_fractional_mv(int_mv *fractional_best_mv) {
  for (int z = 0; z < 3; z++) {
    fractional_best_mv[z].as_int = INVALID_MV;
  }
}

static INLINE void av1_set_subpel_mv_search_range(SubpelMvLimits *subpel_limits,
                                                  const FullMvLimits *mv_limits,
                                                  const MV *ref_mv) {
  const int max_mv = GET_MV_SUBPEL(MAX_FULL_PEL_VAL);
  const int minc =
      AOMMAX(GET_MV_SUBPEL(mv_limits->col_min), ref_mv->col - max_mv);
  const int maxc =
      AOMMIN(GET_MV_SUBPEL(mv_limits->col_max), ref_mv->col + max_mv);
  const int minr =
      AOMMAX(GET_MV_SUBPEL(mv_limits->row_min), ref_mv->row - max_mv);
  const int maxr =
      AOMMIN(GET_MV_SUBPEL(mv_limits->row_max), ref_mv->row + max_mv);

  subpel_limits->col_min = AOMMAX(MV_LOW + 1, minc);
  subpel_limits->col_max = AOMMIN(MV_UPP - 1, maxc);
  subpel_limits->row_min = AOMMAX(MV_LOW + 1, minr);
  subpel_limits->row_max = AOMMIN(MV_UPP - 1, maxr);
}

static INLINE int av1_is_subpelmv_in_range(const SubpelMvLimits *mv_limits,
                                           MV mv) {
  return (mv.col >= mv_limits->col_min) && (mv.col <= mv_limits->col_max) &&
         (mv.row >= mv_limits->row_min) && (mv.row <= mv_limits->row_max);
}

static INLINE int get_offset_from_fullmv(const FULLPEL_MV *mv, int stride) {
  return mv->row * stride + mv->col;
}

static INLINE const uint8_t *get_buf_from_fullmv(const struct buf_2d *buf,
                                                 const FULLPEL_MV *mv) {
  return &buf->buf[get_offset_from_fullmv(mv, buf->stride)];
}

#ifdef __cplusplus
}  // extern "C"
#endif

#endif  // AOM_AV1_ENCODER_MCOMP_H_