xref: /aosp_15_r20/external/libvpx/vp8/common/entropy.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 "entropy.h"
#include "blockd.h"
#include "onyxc_int.h"
#include "vpx_mem/vpx_mem.h"

#include "coefupdateprobs.h"

DECLARE_ALIGNED(16, const unsigned char, vp8_norm[256]) = {
  0, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
  3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};

DECLARE_ALIGNED(16, const unsigned char,
                vp8_coef_bands[16]) = { 0, 1, 2, 3, 6, 4, 5, 6,
                                        6, 6, 6, 6, 6, 6, 6, 7 };

DECLARE_ALIGNED(16, const unsigned char,
                vp8_prev_token_class[MAX_ENTROPY_TOKENS]) = {
  0, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 0
};

DECLARE_ALIGNED(16, const int, vp8_default_zig_zag1d[16]) = {
  0, 1, 4, 8, 5, 2, 3, 6, 9, 12, 13, 10, 7, 11, 14, 15,
};

DECLARE_ALIGNED(16, const short,
                vp8_default_inv_zig_zag[16]) = { 1, 2, 6,  7,  3,  5,  8,  13,
                                                 4, 9, 12, 14, 10, 11, 15, 16 };

/* vp8_default_zig_zag_mask generated with:

    void vp8_init_scan_order_mask()
    {
        int i;

        for (i = 0; i < 16; ++i)
        {
            vp8_default_zig_zag_mask[vp8_default_zig_zag1d[i]] = 1 << i;
        }

    }
*/
DECLARE_ALIGNED(16, const short, vp8_default_zig_zag_mask[16]) = {
  1, 2, 32, 64, 4, 16, 128, 4096, 8, 256, 2048, 8192, 512, 1024, 16384, -32768
};

const int vp8_mb_feature_data_bits[MB_LVL_MAX] = { 7, 6 };

/* Array indices are identical to previously-existing CONTEXT_NODE indices */
/* corresponding _CONTEXT_NODEs */
/* clang-format off */
const vp8_tree_index vp8_coef_tree[22] = {
  -DCT_EOB_TOKEN, 2,                       /* 0 = EOB */
  -ZERO_TOKEN, 4,                          /* 1 = ZERO */
  -ONE_TOKEN, 6,                           /* 2 = ONE */
  8, 12,                                   /* 3 = LOW_VAL */
  -TWO_TOKEN, 10,                          /* 4 = TWO */
  -THREE_TOKEN, -FOUR_TOKEN,               /* 5 = THREE */
  14, 16,                                  /* 6 = HIGH_LOW */
  -DCT_VAL_CATEGORY1, -DCT_VAL_CATEGORY2,  /* 7 = CAT_ONE */
  18, 20,                                  /* 8 = CAT_THREEFOUR */
  -DCT_VAL_CATEGORY3, -DCT_VAL_CATEGORY4,  /* 9 = CAT_THREE */
  -DCT_VAL_CATEGORY5, -DCT_VAL_CATEGORY6   /* 10 = CAT_FIVE */
};
/* clang-format on */

/* vp8_coef_encodings generated with:
    vp8_tokens_from_tree(vp8_coef_encodings, vp8_coef_tree);
*/
vp8_token vp8_coef_encodings[MAX_ENTROPY_TOKENS] = {
  { 2, 2 },  { 6, 3 },   { 28, 5 },  { 58, 6 },  { 59, 6 },  { 60, 6 },
  { 61, 6 }, { 124, 7 }, { 125, 7 }, { 126, 7 }, { 127, 7 }, { 0, 1 }
};

/* Trees for extra bits.  Probabilities are constant and
   do not depend on previously encoded bits */

static const vp8_prob Pcat1[] = { 159 };
static const vp8_prob Pcat2[] = { 165, 145 };
static const vp8_prob Pcat3[] = { 173, 148, 140 };
static const vp8_prob Pcat4[] = { 176, 155, 140, 135 };
static const vp8_prob Pcat5[] = { 180, 157, 141, 134, 130 };
static const vp8_prob Pcat6[] = { 254, 254, 243, 230, 196, 177,
                                  153, 140, 133, 130, 129 };

/* tree index tables generated with:

    void init_bit_tree(vp8_tree_index *p, int n) {
      int i = 0;

      while (++i < n) {
          p[0] = p[1] = i << 1;
          p += 2;
      }

      p[0] = p[1] = 0;
    }

    void init_bit_trees(void) {
      init_bit_tree(cat1, 1);
      init_bit_tree(cat2, 2);
      init_bit_tree(cat3, 3);
      init_bit_tree(cat4, 4);
      init_bit_tree(cat5, 5);
      init_bit_tree(cat6, 11);
    }
*/

static const vp8_tree_index cat1[2] = { 0, 0 };
static const vp8_tree_index cat2[4] = { 2, 2, 0, 0 };
static const vp8_tree_index cat3[6] = { 2, 2, 4, 4, 0, 0 };
static const vp8_tree_index cat4[8] = { 2, 2, 4, 4, 6, 6, 0, 0 };
static const vp8_tree_index cat5[10] = { 2, 2, 4, 4, 6, 6, 8, 8, 0, 0 };
static const vp8_tree_index cat6[22] = { 2,  2,  4,  4,  6,  6,  8,  8,
                                         10, 10, 12, 12, 14, 14, 16, 16,
                                         18, 18, 20, 20, 0,  0 };

const vp8_extra_bit_struct vp8_extra_bits[12] = {
  { 0, 0, 0, 0 },         { 0, 0, 0, 1 },          { 0, 0, 0, 2 },
  { 0, 0, 0, 3 },         { 0, 0, 0, 4 },          { cat1, Pcat1, 1, 5 },
  { cat2, Pcat2, 2, 7 },  { cat3, Pcat3, 3, 11 },  { cat4, Pcat4, 4, 19 },
  { cat5, Pcat5, 5, 35 }, { cat6, Pcat6, 11, 67 }, { 0, 0, 0, 0 }
};

#include "default_coef_probs.h"

void vp8_default_coef_probs(VP8_COMMON *pc) {
  memcpy(pc->fc.coef_probs, default_coef_probs, sizeof(default_coef_probs));
}