/src/libvpx/vp9/common/vp9_blockd.h

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/*
 *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#ifndef VPX_VP9_COMMON_VP9_BLOCKD_H_
#define VPX_VP9_COMMON_VP9_BLOCKD_H_

#include "./vpx_config.h"

#include "vpx_dsp/vpx_dsp_common.h"
#include "vpx_ports/mem.h"
#include "vpx_scale/yv12config.h"

#include "vp9/common/vp9_common_data.h"
#include "vp9/common/vp9_entropy.h"
#include "vp9/common/vp9_entropymode.h"
#include "vp9/common/vp9_mv.h"
#include "vp9/common/vp9_scale.h"
#include "vp9/common/vp9_seg_common.h"
#include "vp9/common/vp9_tile_common.h"

#ifdef __cplusplus
extern "C" {
#endif

#define MAX_MB_PLANE 3

typedef enum {
  KEY_FRAME = 0,
  INTER_FRAME = 1,
  FRAME_TYPES,
} FRAME_TYPE;

static INLINE int is_inter_mode(PREDICTION_MODE mode) {
  return mode >= NEARESTMV && mode <= NEWMV;
}

/* For keyframes, intra block modes are predicted by the (already decoded)
   modes for the Y blocks to the left and above us; for interframes, there
   is a single probability table. */

typedef struct {
  PREDICTION_MODE as_mode;
  int_mv as_mv[2];  // first, second inter predictor motion vectors
} b_mode_info;

// Note that the rate-distortion optimization loop, bit-stream writer, and
// decoder implementation modules critically rely on the defined entry values
// specified herein. They should be refactored concurrently.

#define NO_REF_FRAME (-1)
#define INTRA_FRAME 0
#define LAST_FRAME 1
#define GOLDEN_FRAME 2
#define ALTREF_FRAME 3
#define MAX_REF_FRAMES 4
#define MAX_INTER_REF_FRAMES 3

typedef int8_t MV_REFERENCE_FRAME;

static INLINE int mv_ref_frame_to_inter_ref_idx(
    MV_REFERENCE_FRAME mv_ref_frame) {
  assert(mv_ref_frame >= LAST_FRAME && mv_ref_frame < MAX_REF_FRAMES);
  return mv_ref_frame - 1;
}

// This structure now relates to 8x8 block regions.
typedef struct MODE_INFO {
  // Common for both INTER and INTRA blocks
  BLOCK_SIZE sb_type;
  PREDICTION_MODE mode;
  TX_SIZE tx_size;
  int8_t skip;
  int8_t segment_id;
  int8_t seg_id_predicted;  // valid only when temporal_update is enabled

  // Only for INTRA blocks
  PREDICTION_MODE uv_mode;

  // Only for INTER blocks
  INTERP_FILTER interp_filter;

  // if ref_frame[idx] is equal to ALTREF_FRAME then
  // MACROBLOCKD::block_ref[idx] is an altref
  MV_REFERENCE_FRAME ref_frame[2];

  // TODO(slavarnway): Delete and use bmi[3].as_mv[] instead.
  int_mv mv[2];

  b_mode_info bmi[4];
} MODE_INFO;

static INLINE PREDICTION_MODE get_y_mode(const MODE_INFO *mi, int block) {
  return mi->sb_type < BLOCK_8X8 ? mi->bmi[block].as_mode : mi->mode;
}

static INLINE int is_inter_block(const MODE_INFO *mi) {
  return mi->ref_frame[0] > INTRA_FRAME;
}

static INLINE int has_second_ref(const MODE_INFO *mi) {
  return mi->ref_frame[1] > INTRA_FRAME;
}

PREDICTION_MODE vp9_left_block_mode(const MODE_INFO *cur_mi,
                                    const MODE_INFO *left_mi, int b);

PREDICTION_MODE vp9_above_block_mode(const MODE_INFO *cur_mi,
                                     const MODE_INFO *above_mi, int b);

enum mv_precision { MV_PRECISION_Q3, MV_PRECISION_Q4 };

struct buf_2d {
  uint8_t *buf;
  int stride;
};

struct macroblockd_plane {
  tran_low_t *dqcoeff;
  int subsampling_x;
  int subsampling_y;
  struct buf_2d dst;
  struct buf_2d pre[2];
  ENTROPY_CONTEXT *above_context;
  ENTROPY_CONTEXT *left_context;
  int16_t seg_dequant[MAX_SEGMENTS][2];

  // number of 4x4s in current block
  uint16_t n4_w, n4_h;
  // log2 of n4_w, n4_h
  uint8_t n4_wl, n4_hl;

  // encoder
  const int16_t *dequant;

  int *eob;
};

#define BLOCK_OFFSET(x, i) ((x) + (i) * 16)

typedef struct RefBuffer {
  // TODO(dkovalev): idx is not really required and should be removed, now it
  // is used in vp9_onyxd_if.c
  int idx;
  YV12_BUFFER_CONFIG *buf;
  struct scale_factors sf;
} RefBuffer;

typedef struct macroblockd {
  struct macroblockd_plane plane[MAX_MB_PLANE];
  uint8_t bmode_blocks_wl;
  uint8_t bmode_blocks_hl;

  FRAME_COUNTS *counts;
  TileInfo tile;

  int mi_stride;

  // Grid of 8x8 cells is placed over the block.
  // If some of them belong to the same mbtree-block
  // they will just have same mi[i][j] value
  MODE_INFO **mi;
  MODE_INFO *left_mi;
  MODE_INFO *above_mi;

  unsigned int max_blocks_wide;
  unsigned int max_blocks_high;

  const vpx_prob (*partition_probs)[PARTITION_TYPES - 1];

  /* Distance of MB away from frame edges */
  int mb_to_left_edge;
  int mb_to_right_edge;
  int mb_to_top_edge;
  int mb_to_bottom_edge;

  FRAME_CONTEXT *fc;

  /* pointers to reference frames */
  const RefBuffer *block_refs[2];

  /* pointer to current frame */
  const YV12_BUFFER_CONFIG *cur_buf;

  ENTROPY_CONTEXT *above_context[MAX_MB_PLANE];
  ENTROPY_CONTEXT left_context[MAX_MB_PLANE][16];

  PARTITION_CONTEXT *above_seg_context;
  PARTITION_CONTEXT left_seg_context[8];

#if CONFIG_VP9_HIGHBITDEPTH
  /* Bit depth: 8, 10, 12 */
  int bd;
#endif

  int lossless;
  int corrupted;

  struct vpx_internal_error_info *error_info;

  PARTITION_TYPE *partition;
} MACROBLOCKD;

static INLINE PLANE_TYPE get_plane_type(int plane) {
  return (PLANE_TYPE)(plane > 0);
}

static INLINE BLOCK_SIZE get_subsize(BLOCK_SIZE bsize,
                                     PARTITION_TYPE partition) {
  return subsize_lookup[partition][bsize];
}

extern const TX_TYPE intra_mode_to_tx_type_lookup[INTRA_MODES];

static INLINE TX_TYPE get_tx_type(PLANE_TYPE plane_type,
                                  const MACROBLOCKD *xd) {
  const MODE_INFO *const mi = xd->mi[0];

  if (plane_type != PLANE_TYPE_Y || xd->lossless || is_inter_block(mi))
    return DCT_DCT;

  return intra_mode_to_tx_type_lookup[mi->mode];
}

static INLINE TX_TYPE get_tx_type_4x4(PLANE_TYPE plane_type,
                                      const MACROBLOCKD *xd, int ib) {
  const MODE_INFO *const mi = xd->mi[0];

  if (plane_type != PLANE_TYPE_Y || xd->lossless || is_inter_block(mi))
    return DCT_DCT;

  return intra_mode_to_tx_type_lookup[get_y_mode(mi, ib)];
}

void vp9_setup_block_planes(MACROBLOCKD *xd, int ss_x, int ss_y);

static INLINE TX_SIZE get_uv_tx_size(const MODE_INFO *mi,
                                     const struct macroblockd_plane *pd) {
  assert(mi->sb_type < BLOCK_8X8 ||
         ss_size_lookup[mi->sb_type][pd->subsampling_x][pd->subsampling_y] !=
             BLOCK_INVALID);
  return uv_txsize_lookup[mi->sb_type][mi->tx_size][pd->subsampling_x]
                         [pd->subsampling_y];
}

static INLINE BLOCK_SIZE
get_plane_block_size(BLOCK_SIZE bsize, const struct macroblockd_plane *pd) {
  return ss_size_lookup[bsize][pd->subsampling_x][pd->subsampling_y];
}

static INLINE void reset_skip_context(MACROBLOCKD *xd, BLOCK_SIZE bsize) {
  int i;
  for (i = 0; i < MAX_MB_PLANE; i++) {
    struct macroblockd_plane *const pd = &xd->plane[i];
    const BLOCK_SIZE plane_bsize = get_plane_block_size(bsize, pd);
    memset(pd->above_context, 0,
           sizeof(ENTROPY_CONTEXT) * num_4x4_blocks_wide_lookup[plane_bsize]);
    memset(pd->left_context, 0,
           sizeof(ENTROPY_CONTEXT) * num_4x4_blocks_high_lookup[plane_bsize]);
  }
}

static INLINE const vpx_prob *get_y_mode_probs(const MODE_INFO *mi,
                                               const MODE_INFO *above_mi,
                                               const MODE_INFO *left_mi,
                                               int block) {
  const PREDICTION_MODE above = vp9_above_block_mode(mi, above_mi, block);
  const PREDICTION_MODE left = vp9_left_block_mode(mi, left_mi, block);
  return vp9_kf_y_mode_prob[above][left];
}

typedef void (*foreach_transformed_block_visitor)(int plane, int block, int row,
                                                  int col,
                                                  BLOCK_SIZE plane_bsize,
                                                  TX_SIZE tx_size, void *arg);

void vp9_foreach_transformed_block_in_plane(
    const MACROBLOCKD *const xd, BLOCK_SIZE bsize, int plane,
    foreach_transformed_block_visitor visit, void *arg);

void vp9_foreach_transformed_block(const MACROBLOCKD *const xd,
                                   BLOCK_SIZE bsize,
                                   foreach_transformed_block_visitor visit,
                                   void *arg);

void vp9_set_contexts(const MACROBLOCKD *xd, struct macroblockd_plane *pd,
                      BLOCK_SIZE plane_bsize, TX_SIZE tx_size, int has_eob,
                      int aoff, int loff);

#if CONFIG_MISMATCH_DEBUG
#define TX_UNIT_SIZE_LOG2 2
static INLINE void mi_to_pixel_loc(int *pixel_c, int *pixel_r, int mi_col,
                                   int mi_row, int tx_blk_col, int tx_blk_row,
                                   int subsampling_x, int subsampling_y) {
  *pixel_c = ((mi_col << MI_SIZE_LOG2) >> subsampling_x) +
             (tx_blk_col << TX_UNIT_SIZE_LOG2);
  *pixel_r = ((mi_row << MI_SIZE_LOG2) >> subsampling_y) +
             (tx_blk_row << TX_UNIT_SIZE_LOG2);
}

static INLINE int get_block_width(BLOCK_SIZE bsize) {
  const int num_4x4_w = num_4x4_blocks_wide_lookup[bsize];
  return 4 * num_4x4_w;
}

static INLINE int get_block_height(BLOCK_SIZE bsize) {
  const int num_4x4_h = num_4x4_blocks_high_lookup[bsize];
  return 4 * num_4x4_h;
}
#endif

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

#endif  // VPX_VP9_COMMON_VP9_BLOCKD_H_

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Created: 2025-08-28 06:29