xref: /aosp_15_r20/external/libvpx/vp9/common/vp9_entropymode.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 "vpx_mem/vpx_mem.h"

#include "vp9/common/vp9_onyxc_int.h"
#include "vp9/common/vp9_seg_common.h"

const vpx_prob vp9_kf_y_mode_prob[INTRA_MODES][INTRA_MODES][INTRA_MODES - 1] = {
  {
      // above = dc
      { 137, 30, 42, 148, 151, 207, 70, 52, 91 },   // left = dc
      { 92, 45, 102, 136, 116, 180, 74, 90, 100 },  // left = v
      { 73, 32, 19, 187, 222, 215, 46, 34, 100 },   // left = h
      { 91, 30, 32, 116, 121, 186, 93, 86, 94 },    // left = d45
      { 72, 35, 36, 149, 68, 206, 68, 63, 105 },    // left = d135
      { 73, 31, 28, 138, 57, 124, 55, 122, 151 },   // left = d117
      { 67, 23, 21, 140, 126, 197, 40, 37, 171 },   // left = d153
      { 86, 27, 28, 128, 154, 212, 45, 43, 53 },    // left = d207
      { 74, 32, 27, 107, 86, 160, 63, 134, 102 },   // left = d63
      { 59, 67, 44, 140, 161, 202, 78, 67, 119 }    // left = tm
  },
  {
      // above = v
      { 63, 36, 126, 146, 123, 158, 60, 90, 96 },   // left = dc
      { 43, 46, 168, 134, 107, 128, 69, 142, 92 },  // left = v
      { 44, 29, 68, 159, 201, 177, 50, 57, 77 },    // left = h
      { 58, 38, 76, 114, 97, 172, 78, 133, 92 },    // left = d45
      { 46, 41, 76, 140, 63, 184, 69, 112, 57 },    // left = d135
      { 38, 32, 85, 140, 46, 112, 54, 151, 133 },   // left = d117
      { 39, 27, 61, 131, 110, 175, 44, 75, 136 },   // left = d153
      { 52, 30, 74, 113, 130, 175, 51, 64, 58 },    // left = d207
      { 47, 35, 80, 100, 74, 143, 64, 163, 74 },    // left = d63
      { 36, 61, 116, 114, 128, 162, 80, 125, 82 }   // left = tm
  },
  {
      // above = h
      { 82, 26, 26, 171, 208, 204, 44, 32, 105 },  // left = dc
      { 55, 44, 68, 166, 179, 192, 57, 57, 108 },  // left = v
      { 42, 26, 11, 199, 241, 228, 23, 15, 85 },   // left = h
      { 68, 42, 19, 131, 160, 199, 55, 52, 83 },   // left = d45
      { 58, 50, 25, 139, 115, 232, 39, 52, 118 },  // left = d135
      { 50, 35, 33, 153, 104, 162, 64, 59, 131 },  // left = d117
      { 44, 24, 16, 150, 177, 202, 33, 19, 156 },  // left = d153
      { 55, 27, 12, 153, 203, 218, 26, 27, 49 },   // left = d207
      { 53, 49, 21, 110, 116, 168, 59, 80, 76 },   // left = d63
      { 38, 72, 19, 168, 203, 212, 50, 50, 107 }   // left = tm
  },
  {
      // above = d45
      { 103, 26, 36, 129, 132, 201, 83, 80, 93 },  // left = dc
      { 59, 38, 83, 112, 103, 162, 98, 136, 90 },  // left = v
      { 62, 30, 23, 158, 200, 207, 59, 57, 50 },   // left = h
      { 67, 30, 29, 84, 86, 191, 102, 91, 59 },    // left = d45
      { 60, 32, 33, 112, 71, 220, 64, 89, 104 },   // left = d135
      { 53, 26, 34, 130, 56, 149, 84, 120, 103 },  // left = d117
      { 53, 21, 23, 133, 109, 210, 56, 77, 172 },  // left = d153
      { 77, 19, 29, 112, 142, 228, 55, 66, 36 },   // left = d207
      { 61, 29, 29, 93, 97, 165, 83, 175, 162 },   // left = d63
      { 47, 47, 43, 114, 137, 181, 100, 99, 95 }   // left = tm
  },
  {
      // above = d135
      { 69, 23, 29, 128, 83, 199, 46, 44, 101 },   // left = dc
      { 53, 40, 55, 139, 69, 183, 61, 80, 110 },   // left = v
      { 40, 29, 19, 161, 180, 207, 43, 24, 91 },   // left = h
      { 60, 34, 19, 105, 61, 198, 53, 64, 89 },    // left = d45
      { 52, 31, 22, 158, 40, 209, 58, 62, 89 },    // left = d135
      { 44, 31, 29, 147, 46, 158, 56, 102, 198 },  // left = d117
      { 35, 19, 12, 135, 87, 209, 41, 45, 167 },   // left = d153
      { 55, 25, 21, 118, 95, 215, 38, 39, 66 },    // left = d207
      { 51, 38, 25, 113, 58, 164, 70, 93, 97 },    // left = d63
      { 47, 54, 34, 146, 108, 203, 72, 103, 151 }  // left = tm
  },
  {
      // above = d117
      { 64, 19, 37, 156, 66, 138, 49, 95, 133 },   // left = dc
      { 46, 27, 80, 150, 55, 124, 55, 121, 135 },  // left = v
      { 36, 23, 27, 165, 149, 166, 54, 64, 118 },  // left = h
      { 53, 21, 36, 131, 63, 163, 60, 109, 81 },   // left = d45
      { 40, 26, 35, 154, 40, 185, 51, 97, 123 },   // left = d135
      { 35, 19, 34, 179, 19, 97, 48, 129, 124 },   // left = d117
      { 36, 20, 26, 136, 62, 164, 33, 77, 154 },   // left = d153
      { 45, 18, 32, 130, 90, 157, 40, 79, 91 },    // left = d207
      { 45, 26, 28, 129, 45, 129, 49, 147, 123 },  // left = d63
      { 38, 44, 51, 136, 74, 162, 57, 97, 121 }    // left = tm
  },
  {
      // above = d153
      { 75, 17, 22, 136, 138, 185, 32, 34, 166 },  // left = dc
      { 56, 39, 58, 133, 117, 173, 48, 53, 187 },  // left = v
      { 35, 21, 12, 161, 212, 207, 20, 23, 145 },  // left = h
      { 56, 29, 19, 117, 109, 181, 55, 68, 112 },  // left = d45
      { 47, 29, 17, 153, 64, 220, 59, 51, 114 },   // left = d135
      { 46, 16, 24, 136, 76, 147, 41, 64, 172 },   // left = d117
      { 34, 17, 11, 108, 152, 187, 13, 15, 209 },  // left = d153
      { 51, 24, 14, 115, 133, 209, 32, 26, 104 },  // left = d207
      { 55, 30, 18, 122, 79, 179, 44, 88, 116 },   // left = d63
      { 37, 49, 25, 129, 168, 164, 41, 54, 148 }   // left = tm
  },
  {
      // above = d207
      { 82, 22, 32, 127, 143, 213, 39, 41, 70 },   // left = dc
      { 62, 44, 61, 123, 105, 189, 48, 57, 64 },   // left = v
      { 47, 25, 17, 175, 222, 220, 24, 30, 86 },   // left = h
      { 68, 36, 17, 106, 102, 206, 59, 74, 74 },   // left = d45
      { 57, 39, 23, 151, 68, 216, 55, 63, 58 },    // left = d135
      { 49, 30, 35, 141, 70, 168, 82, 40, 115 },   // left = d117
      { 51, 25, 15, 136, 129, 202, 38, 35, 139 },  // left = d153
      { 68, 26, 16, 111, 141, 215, 29, 28, 28 },   // left = d207
      { 59, 39, 19, 114, 75, 180, 77, 104, 42 },   // left = d63
      { 40, 61, 26, 126, 152, 206, 61, 59, 93 }    // left = tm
  },
  {
      // above = d63
      { 78, 23, 39, 111, 117, 170, 74, 124, 94 },   // left = dc
      { 48, 34, 86, 101, 92, 146, 78, 179, 134 },   // left = v
      { 47, 22, 24, 138, 187, 178, 68, 69, 59 },    // left = h
      { 56, 25, 33, 105, 112, 187, 95, 177, 129 },  // left = d45
      { 48, 31, 27, 114, 63, 183, 82, 116, 56 },    // left = d135
      { 43, 28, 37, 121, 63, 123, 61, 192, 169 },   // left = d117
      { 42, 17, 24, 109, 97, 177, 56, 76, 122 },    // left = d153
      { 58, 18, 28, 105, 139, 182, 70, 92, 63 },    // left = d207
      { 46, 23, 32, 74, 86, 150, 67, 183, 88 },     // left = d63
      { 36, 38, 48, 92, 122, 165, 88, 137, 91 }     // left = tm
  },
  {
      // above = tm
      { 65, 70, 60, 155, 159, 199, 61, 60, 81 },    // left = dc
      { 44, 78, 115, 132, 119, 173, 71, 112, 93 },  // left = v
      { 39, 38, 21, 184, 227, 206, 42, 32, 64 },    // left = h
      { 58, 47, 36, 124, 137, 193, 80, 82, 78 },    // left = d45
      { 49, 50, 35, 144, 95, 205, 63, 78, 59 },     // left = d135
      { 41, 53, 52, 148, 71, 142, 65, 128, 51 },    // left = d117
      { 40, 36, 28, 143, 143, 202, 40, 55, 137 },   // left = d153
      { 52, 34, 29, 129, 183, 227, 42, 35, 43 },    // left = d207
      { 42, 44, 44, 104, 105, 164, 64, 130, 80 },   // left = d63
      { 43, 81, 53, 140, 169, 204, 68, 84, 72 }     // left = tm
  }
};

const vpx_prob vp9_kf_uv_mode_prob[INTRA_MODES][INTRA_MODES - 1] = {
  { 144, 11, 54, 157, 195, 130, 46, 58, 108 },   // y = dc
  { 118, 15, 123, 148, 131, 101, 44, 93, 131 },  // y = v
  { 113, 12, 23, 188, 226, 142, 26, 32, 125 },   // y = h
  { 120, 11, 50, 123, 163, 135, 64, 77, 103 },   // y = d45
  { 113, 9, 36, 155, 111, 157, 32, 44, 161 },    // y = d135
  { 116, 9, 55, 176, 76, 96, 37, 61, 149 },      // y = d117
  { 115, 9, 28, 141, 161, 167, 21, 25, 193 },    // y = d153
  { 120, 12, 32, 145, 195, 142, 32, 38, 86 },    // y = d207
  { 116, 12, 64, 120, 140, 125, 49, 115, 121 },  // y = d63
  { 102, 19, 66, 162, 182, 122, 35, 59, 128 }    // y = tm
};

static const vpx_prob default_if_y_probs[BLOCK_SIZE_GROUPS][INTRA_MODES - 1] = {
  { 65, 32, 18, 144, 162, 194, 41, 51, 98 },   // block_size < 8x8
  { 132, 68, 18, 165, 217, 196, 45, 40, 78 },  // block_size < 16x16
  { 173, 80, 19, 176, 240, 193, 64, 35, 46 },  // block_size < 32x32
  { 221, 135, 38, 194, 248, 121, 96, 85, 29 }  // block_size >= 32x32
};

static const vpx_prob default_if_uv_probs[INTRA_MODES][INTRA_MODES - 1] = {
  { 120, 7, 76, 176, 208, 126, 28, 54, 103 },   // y = dc
  { 48, 12, 154, 155, 139, 90, 34, 117, 119 },  // y = v
  { 67, 6, 25, 204, 243, 158, 13, 21, 96 },     // y = h
  { 97, 5, 44, 131, 176, 139, 48, 68, 97 },     // y = d45
  { 83, 5, 42, 156, 111, 152, 26, 49, 152 },    // y = d135
  { 80, 5, 58, 178, 74, 83, 33, 62, 145 },      // y = d117
  { 86, 5, 32, 154, 192, 168, 14, 22, 163 },    // y = d153
  { 85, 5, 32, 156, 216, 148, 19, 29, 73 },     // y = d207
  { 77, 7, 64, 116, 132, 122, 37, 126, 120 },   // y = d63
  { 101, 21, 107, 181, 192, 103, 19, 67, 125 }  // y = tm
};

const vpx_prob vp9_kf_partition_probs[PARTITION_CONTEXTS]
                                     [PARTITION_TYPES - 1] = {
                                       // 8x8 -> 4x4
                                       { 158, 97, 94 },  // a/l both not split
                                       { 93, 24, 99 },   // a split, l not split
                                       { 85, 119, 44 },  // l split, a not split
                                       { 62, 59, 67 },   // a/l both split

                                       // 16x16 -> 8x8
                                       { 149, 53, 53 },  // a/l both not split
                                       { 94, 20, 48 },   // a split, l not split
                                       { 83, 53, 24 },   // l split, a not split
                                       { 52, 18, 18 },   // a/l both split

                                       // 32x32 -> 16x16
                                       { 150, 40, 39 },  // a/l both not split
                                       { 78, 12, 26 },   // a split, l not split
                                       { 67, 33, 11 },   // l split, a not split
                                       { 24, 7, 5 },     // a/l both split

                                       // 64x64 -> 32x32
                                       { 174, 35, 49 },  // a/l both not split
                                       { 68, 11, 27 },   // a split, l not split
                                       { 57, 15, 9 },    // l split, a not split
                                       { 12, 3, 3 },     // a/l both split
                                     };

static const vpx_prob
    default_partition_probs[PARTITION_CONTEXTS][PARTITION_TYPES - 1] = {
      // 8x8 -> 4x4
      { 199, 122, 141 },  // a/l both not split
      { 147, 63, 159 },   // a split, l not split
      { 148, 133, 118 },  // l split, a not split
      { 121, 104, 114 },  // a/l both split
      // 16x16 -> 8x8
      { 174, 73, 87 },  // a/l both not split
      { 92, 41, 83 },   // a split, l not split
      { 82, 99, 50 },   // l split, a not split
      { 53, 39, 39 },   // a/l both split
      // 32x32 -> 16x16
      { 177, 58, 59 },  // a/l both not split
      { 68, 26, 63 },   // a split, l not split
      { 52, 79, 25 },   // l split, a not split
      { 17, 14, 12 },   // a/l both split
      // 64x64 -> 32x32
      { 222, 34, 30 },  // a/l both not split
      { 72, 16, 44 },   // a split, l not split
      { 58, 32, 12 },   // l split, a not split
      { 10, 7, 6 },     // a/l both split
    };

static const vpx_prob
    default_inter_mode_probs[INTER_MODE_CONTEXTS][INTER_MODES - 1] = {
      { 2, 173, 34 },  // 0 = both zero mv
      { 7, 145, 85 },  // 1 = one zero mv + one a predicted mv
      { 7, 166, 63 },  // 2 = two predicted mvs
      { 7, 94, 66 },   // 3 = one predicted/zero and one new mv
      { 8, 64, 46 },   // 4 = two new mvs
      { 17, 81, 31 },  // 5 = one intra neighbour + x
      { 25, 29, 30 },  // 6 = two intra neighbours
    };

/* Array indices are identical to previously-existing INTRAMODECONTEXTNODES. */
const vpx_tree_index vp9_intra_mode_tree[TREE_SIZE(INTRA_MODES)] = {
  -DC_PRED,   2,          /* 0 = DC_NODE */
  -TM_PRED,   4,          /* 1 = TM_NODE */
  -V_PRED,    6,          /* 2 = V_NODE */
  8,          12,         /* 3 = COM_NODE */
  -H_PRED,    10,         /* 4 = H_NODE */
  -D135_PRED, -D117_PRED, /* 5 = D135_NODE */
  -D45_PRED,  14,         /* 6 = D45_NODE */
  -D63_PRED,  16,         /* 7 = D63_NODE */
  -D153_PRED, -D207_PRED  /* 8 = D153_NODE */
};

const vpx_tree_index vp9_inter_mode_tree[TREE_SIZE(INTER_MODES)] = {
  -INTER_OFFSET(ZEROMV), 2, -INTER_OFFSET(NEARESTMV), 4, -INTER_OFFSET(NEARMV),
  -INTER_OFFSET(NEWMV)
};

const vpx_tree_index vp9_partition_tree[TREE_SIZE(PARTITION_TYPES)] = {
  -PARTITION_NONE, 2, -PARTITION_HORZ, 4, -PARTITION_VERT, -PARTITION_SPLIT
};

static const vpx_prob default_intra_inter_p[INTRA_INTER_CONTEXTS] = { 9, 102,
                                                                      187,
                                                                      225 };

static const vpx_prob default_comp_inter_p[COMP_INTER_CONTEXTS] = { 239, 183,
                                                                    119, 96,
                                                                    41 };

static const vpx_prob default_comp_ref_p[REF_CONTEXTS] = { 50, 126, 123, 221,
                                                           226 };

static const vpx_prob default_single_ref_p[REF_CONTEXTS][2] = {
  { 33, 16 }, { 77, 74 }, { 142, 142 }, { 172, 170 }, { 238, 247 }
};

static const struct tx_probs default_tx_probs = { { { 3, 136, 37 },
                                                    { 5, 52, 13 } },

                                                  { { 20, 152 }, { 15, 101 } },

                                                  { { 100 }, { 66 } } };

void tx_counts_to_branch_counts_32x32(const unsigned int *tx_count_32x32p,
                                      unsigned int (*ct_32x32p)[2]) {
  ct_32x32p[0][0] = tx_count_32x32p[TX_4X4];
  ct_32x32p[0][1] = tx_count_32x32p[TX_8X8] + tx_count_32x32p[TX_16X16] +
                    tx_count_32x32p[TX_32X32];
  ct_32x32p[1][0] = tx_count_32x32p[TX_8X8];
  ct_32x32p[1][1] = tx_count_32x32p[TX_16X16] + tx_count_32x32p[TX_32X32];
  ct_32x32p[2][0] = tx_count_32x32p[TX_16X16];
  ct_32x32p[2][1] = tx_count_32x32p[TX_32X32];
}

void tx_counts_to_branch_counts_16x16(const unsigned int *tx_count_16x16p,
                                      unsigned int (*ct_16x16p)[2]) {
  ct_16x16p[0][0] = tx_count_16x16p[TX_4X4];
  ct_16x16p[0][1] = tx_count_16x16p[TX_8X8] + tx_count_16x16p[TX_16X16];
  ct_16x16p[1][0] = tx_count_16x16p[TX_8X8];
  ct_16x16p[1][1] = tx_count_16x16p[TX_16X16];
}

void tx_counts_to_branch_counts_8x8(const unsigned int *tx_count_8x8p,
                                    unsigned int (*ct_8x8p)[2]) {
  ct_8x8p[0][0] = tx_count_8x8p[TX_4X4];
  ct_8x8p[0][1] = tx_count_8x8p[TX_8X8];
}

static const vpx_prob default_skip_probs[SKIP_CONTEXTS] = { 192, 128, 64 };

static const vpx_prob default_switchable_interp_prob[SWITCHABLE_FILTER_CONTEXTS]
                                                    [SWITCHABLE_FILTERS - 1] = {
                                                      { 235, 162 },
                                                      { 36, 255 },
                                                      { 34, 3 },
                                                      { 149, 144 },
                                                    };

static void init_mode_probs(FRAME_CONTEXT *fc) {
  vp9_copy(fc->uv_mode_prob, default_if_uv_probs);
  vp9_copy(fc->y_mode_prob, default_if_y_probs);
  vp9_copy(fc->switchable_interp_prob, default_switchable_interp_prob);
  vp9_copy(fc->partition_prob, default_partition_probs);
  vp9_copy(fc->intra_inter_prob, default_intra_inter_p);
  vp9_copy(fc->comp_inter_prob, default_comp_inter_p);
  vp9_copy(fc->comp_ref_prob, default_comp_ref_p);
  vp9_copy(fc->single_ref_prob, default_single_ref_p);
  fc->tx_probs = default_tx_probs;
  vp9_copy(fc->skip_probs, default_skip_probs);
  vp9_copy(fc->inter_mode_probs, default_inter_mode_probs);
}

const vpx_tree_index vp9_switchable_interp_tree[TREE_SIZE(
    SWITCHABLE_FILTERS)] = { -EIGHTTAP, 2, -EIGHTTAP_SMOOTH, -EIGHTTAP_SHARP };

void vp9_adapt_mode_probs(VP9_COMMON *cm) {
  int i, j;
  FRAME_CONTEXT *fc = cm->fc;
  const FRAME_CONTEXT *pre_fc = &cm->frame_contexts[cm->frame_context_idx];
  const FRAME_COUNTS *counts = &cm->counts;

  for (i = 0; i < INTRA_INTER_CONTEXTS; i++)
    fc->intra_inter_prob[i] = mode_mv_merge_probs(pre_fc->intra_inter_prob[i],
                                                  counts->intra_inter[i]);
  for (i = 0; i < COMP_INTER_CONTEXTS; i++)
    fc->comp_inter_prob[i] =
        mode_mv_merge_probs(pre_fc->comp_inter_prob[i], counts->comp_inter[i]);
  for (i = 0; i < REF_CONTEXTS; i++)
    fc->comp_ref_prob[i] =
        mode_mv_merge_probs(pre_fc->comp_ref_prob[i], counts->comp_ref[i]);
  for (i = 0; i < REF_CONTEXTS; i++)
    for (j = 0; j < 2; j++)
      fc->single_ref_prob[i][j] = mode_mv_merge_probs(
          pre_fc->single_ref_prob[i][j], counts->single_ref[i][j]);

  for (i = 0; i < INTER_MODE_CONTEXTS; i++)
    vpx_tree_merge_probs(vp9_inter_mode_tree, pre_fc->inter_mode_probs[i],
                         counts->inter_mode[i], fc->inter_mode_probs[i]);

  for (i = 0; i < BLOCK_SIZE_GROUPS; i++)
    vpx_tree_merge_probs(vp9_intra_mode_tree, pre_fc->y_mode_prob[i],
                         counts->y_mode[i], fc->y_mode_prob[i]);

  for (i = 0; i < INTRA_MODES; ++i)
    vpx_tree_merge_probs(vp9_intra_mode_tree, pre_fc->uv_mode_prob[i],
                         counts->uv_mode[i], fc->uv_mode_prob[i]);

  for (i = 0; i < PARTITION_CONTEXTS; i++)
    vpx_tree_merge_probs(vp9_partition_tree, pre_fc->partition_prob[i],
                         counts->partition[i], fc->partition_prob[i]);

  if (cm->interp_filter == SWITCHABLE) {
    for (i = 0; i < SWITCHABLE_FILTER_CONTEXTS; i++)
      vpx_tree_merge_probs(
          vp9_switchable_interp_tree, pre_fc->switchable_interp_prob[i],
          counts->switchable_interp[i], fc->switchable_interp_prob[i]);
  }

  if (cm->tx_mode == TX_MODE_SELECT) {
    unsigned int branch_ct_8x8p[TX_SIZES - 3][2];
    unsigned int branch_ct_16x16p[TX_SIZES - 2][2];
    unsigned int branch_ct_32x32p[TX_SIZES - 1][2];

    for (i = 0; i < TX_SIZE_CONTEXTS; ++i) {
      tx_counts_to_branch_counts_8x8(counts->tx.p8x8[i], branch_ct_8x8p);
      for (j = 0; j < TX_SIZES - 3; ++j)
        fc->tx_probs.p8x8[i][j] =
            mode_mv_merge_probs(pre_fc->tx_probs.p8x8[i][j], branch_ct_8x8p[j]);

      tx_counts_to_branch_counts_16x16(counts->tx.p16x16[i], branch_ct_16x16p);
      for (j = 0; j < TX_SIZES - 2; ++j)
        fc->tx_probs.p16x16[i][j] = mode_mv_merge_probs(
            pre_fc->tx_probs.p16x16[i][j], branch_ct_16x16p[j]);

      tx_counts_to_branch_counts_32x32(counts->tx.p32x32[i], branch_ct_32x32p);
      for (j = 0; j < TX_SIZES - 1; ++j)
        fc->tx_probs.p32x32[i][j] = mode_mv_merge_probs(
            pre_fc->tx_probs.p32x32[i][j], branch_ct_32x32p[j]);
    }
  }

  for (i = 0; i < SKIP_CONTEXTS; ++i)
    fc->skip_probs[i] =
        mode_mv_merge_probs(pre_fc->skip_probs[i], counts->skip[i]);
}

static void set_default_lf_deltas(struct loopfilter *lf) {
  lf->mode_ref_delta_enabled = 1;
  lf->mode_ref_delta_update = 1;

  lf->ref_deltas[INTRA_FRAME] = 1;
  lf->ref_deltas[LAST_FRAME] = 0;
  lf->ref_deltas[GOLDEN_FRAME] = -1;
  lf->ref_deltas[ALTREF_FRAME] = -1;

  lf->mode_deltas[0] = 0;
  lf->mode_deltas[1] = 0;
}

void vp9_setup_past_independence(VP9_COMMON *cm) {
  // Reset the segment feature data to the default stats:
  // Features disabled, 0, with delta coding (Default state).
  struct loopfilter *const lf = &cm->lf;

  int i;
  vp9_clearall_segfeatures(&cm->seg);
  cm->seg.abs_delta = SEGMENT_DELTADATA;

  if (cm->last_frame_seg_map)
    memset(cm->last_frame_seg_map, 0, (cm->mi_rows * cm->mi_cols));

  if (cm->current_frame_seg_map)
    memset(cm->current_frame_seg_map, 0, (cm->mi_rows * cm->mi_cols));

  // Reset the mode ref deltas for loop filter
  vp9_zero(lf->last_ref_deltas);
  vp9_zero(lf->last_mode_deltas);
  set_default_lf_deltas(lf);

  // To force update of the sharpness
  lf->last_sharpness_level = -1;

  vp9_default_coef_probs(cm);
  init_mode_probs(cm->fc);
  vp9_init_mv_probs(cm);
  cm->fc->initialized = 1;

  if (cm->frame_type == KEY_FRAME || cm->error_resilient_mode ||
      cm->reset_frame_context == 3) {
    // Reset all frame contexts.
    for (i = 0; i < FRAME_CONTEXTS; ++i) cm->frame_contexts[i] = *cm->fc;
  } else if (cm->reset_frame_context == 2) {
    // Reset only the frame context specified in the frame header.
    cm->frame_contexts[cm->frame_context_idx] = *cm->fc;
  }

  // prev_mip will only be allocated in encoder.
  if (frame_is_intra_only(cm) && cm->prev_mip)
    memset(cm->prev_mip, 0,
           cm->mi_stride * (cm->mi_rows + 1) * sizeof(*cm->prev_mip));

  vp9_zero(cm->ref_frame_sign_bias);

  cm->frame_context_idx = 0;
}