xref: /aosp_15_r20/external/libvpx/vp9/common/vp9_entropymv.c (revision fb1b10ab9aebc7c7068eedab379b749d7e3900be)

/*
 *  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.
 */

#include "vp9/common/vp9_onyxc_int.h"
#include "vp9/common/vp9_entropymv.h"

const vpx_tree_index vp9_mv_joint_tree[TREE_SIZE(MV_JOINTS)] = {
  -MV_JOINT_ZERO, 2, -MV_JOINT_HNZVZ, 4, -MV_JOINT_HZVNZ, -MV_JOINT_HNZVNZ
};

const vpx_tree_index vp9_mv_class_tree[TREE_SIZE(MV_CLASSES)] = {
  -MV_CLASS_0, 2,           -MV_CLASS_1, 4,           6,
  8,           -MV_CLASS_2, -MV_CLASS_3, 10,          12,
  -MV_CLASS_4, -MV_CLASS_5, -MV_CLASS_6, 14,          16,
  18,          -MV_CLASS_7, -MV_CLASS_8, -MV_CLASS_9, -MV_CLASS_10,
};

const vpx_tree_index vp9_mv_class0_tree[TREE_SIZE(CLASS0_SIZE)] = { -0, -1 };

const vpx_tree_index vp9_mv_fp_tree[TREE_SIZE(MV_FP_SIZE)] = { -0, 2,  -1,
                                                               4,  -2, -3 };

static const nmv_context default_nmv_context = {
  { 32, 64, 96 },
  { {
        // Vertical component
        128,                                                   // sign
        { 224, 144, 192, 168, 192, 176, 192, 198, 198, 245 },  // class
        { 216 },                                               // class0
        { 136, 140, 148, 160, 176, 192, 224, 234, 234, 240 },  // bits
        { { 128, 128, 64 }, { 96, 112, 64 } },                 // class0_fp
        { 64, 96, 64 },                                        // fp
        160,                                                   // class0_hp bit
        128,                                                   // hp
    },
    {
        // Horizontal component
        128,                                                   // sign
        { 216, 128, 176, 160, 176, 176, 192, 198, 198, 208 },  // class
        { 208 },                                               // class0
        { 136, 140, 148, 160, 176, 192, 224, 234, 234, 240 },  // bits
        { { 128, 128, 64 }, { 96, 112, 64 } },                 // class0_fp
        { 64, 96, 64 },                                        // fp
        160,                                                   // class0_hp bit
        128,                                                   // hp
    } },
};

static const uint8_t log_in_base_2[] = {
  0, 0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
  4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
  5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
  6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
  6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7,
  7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
  7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
  7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
  7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
  7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8,
  8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
  8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
  8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
  8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
  8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
  8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
  8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
  8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
  8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
  8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9,
  9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
  9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
  9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
  9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
  9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
  9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
  9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
  9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
  9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
  9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
  9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
  9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
  9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
  9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
  9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
  9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
  9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
  9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
  9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9,
  9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 10
};

static INLINE int mv_class_base(MV_CLASS_TYPE c) {
  return c ? CLASS0_SIZE << (c + 2) : 0;
}

MV_CLASS_TYPE vp9_get_mv_class(int z, int *offset) {
  const MV_CLASS_TYPE c = (z >= CLASS0_SIZE * 4096)
                              ? MV_CLASS_10
                              : (MV_CLASS_TYPE)log_in_base_2[z >> 3];
  if (offset) *offset = z - mv_class_base(c);
  return c;
}

static void inc_mv_component(int v, nmv_component_counts *comp_counts, int incr,
                             int usehp) {
  int s, z, c, o, d, e, f;
  assert(v != 0); /* should not be zero */
  s = v < 0;
  comp_counts->sign[s] += incr;
  z = (s ? -v : v) - 1; /* magnitude - 1 */

  c = vp9_get_mv_class(z, &o);
  comp_counts->classes[c] += incr;

  d = (o >> 3);     /* int mv data */
  f = (o >> 1) & 3; /* fractional pel mv data */
  e = (o & 1);      /* high precision mv data */

  if (c == MV_CLASS_0) {
    comp_counts->class0[d] += incr;
    comp_counts->class0_fp[d][f] += incr;
    comp_counts->class0_hp[e] += usehp * incr;
  } else {
    int i;
    int b = c + CLASS0_BITS - 1;  // number of bits
    for (i = 0; i < b; ++i) comp_counts->bits[i][((d >> i) & 1)] += incr;
    comp_counts->fp[f] += incr;
    comp_counts->hp[e] += usehp * incr;
  }
}

void vp9_inc_mv(const MV *mv, nmv_context_counts *counts) {
  if (counts != NULL) {
    const MV_JOINT_TYPE j = vp9_get_mv_joint(mv);
    ++counts->joints[j];

    if (mv_joint_vertical(j)) {
      inc_mv_component(mv->row, &counts->comps[0], 1, 1);
    }

    if (mv_joint_horizontal(j)) {
      inc_mv_component(mv->col, &counts->comps[1], 1, 1);
    }
  }
}

void vp9_adapt_mv_probs(VP9_COMMON *cm, int allow_hp) {
  int i, j;

  nmv_context *fc = &cm->fc->nmvc;
  const nmv_context *pre_fc = &cm->frame_contexts[cm->frame_context_idx].nmvc;
  const nmv_context_counts *counts = &cm->counts.mv;

  vpx_tree_merge_probs(vp9_mv_joint_tree, pre_fc->joints, counts->joints,
                       fc->joints);

  for (i = 0; i < 2; ++i) {
    nmv_component *comp = &fc->comps[i];
    const nmv_component *pre_comp = &pre_fc->comps[i];
    const nmv_component_counts *c = &counts->comps[i];

    comp->sign = mode_mv_merge_probs(pre_comp->sign, c->sign);
    vpx_tree_merge_probs(vp9_mv_class_tree, pre_comp->classes, c->classes,
                         comp->classes);
    vpx_tree_merge_probs(vp9_mv_class0_tree, pre_comp->class0, c->class0,
                         comp->class0);

    for (j = 0; j < MV_OFFSET_BITS; ++j)
      comp->bits[j] = mode_mv_merge_probs(pre_comp->bits[j], c->bits[j]);

    for (j = 0; j < CLASS0_SIZE; ++j)
      vpx_tree_merge_probs(vp9_mv_fp_tree, pre_comp->class0_fp[j],
                           c->class0_fp[j], comp->class0_fp[j]);

    vpx_tree_merge_probs(vp9_mv_fp_tree, pre_comp->fp, c->fp, comp->fp);

    if (allow_hp) {
      comp->class0_hp = mode_mv_merge_probs(pre_comp->class0_hp, c->class0_hp);
      comp->hp = mode_mv_merge_probs(pre_comp->hp, c->hp);
    }
  }
}

void vp9_init_mv_probs(VP9_COMMON *cm) { cm->fc->nmvc = default_nmv_context; }