/*
 *  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 <assert.h>
#include <math.h>
#include <stdio.h>
#include <string.h>

#include "vpx_mem/vpx_mem.h"

#include "vp9/common/vp9_entropy.h"
#include "vp9/common/vp9_pred_common.h"
#include "vp9/common/vp9_scan.h"

#include "vp9/encoder/vp9_cost.h"
#include "vp9/encoder/vp9_encoder.h"
#include "vp9/encoder/vp9_tokenize.h"

static const TOKENVALUE dct_cat_lt_10_value_tokens[] = {
  { 9, 63 }, { 9, 61 }, { 9, 59 }, { 9, 57 }, { 9, 55 }, { 9, 53 }, { 9, 51 },
  { 9, 49 }, { 9, 47 }, { 9, 45 }, { 9, 43 }, { 9, 41 }, { 9, 39 }, { 9, 37 },
  { 9, 35 }, { 9, 33 }, { 9, 31 }, { 9, 29 }, { 9, 27 }, { 9, 25 }, { 9, 23 },
  { 9, 21 }, { 9, 19 }, { 9, 17 }, { 9, 15 }, { 9, 13 }, { 9, 11 }, { 9, 9 },
  { 9, 7 },  { 9, 5 },  { 9, 3 },  { 9, 1 },  { 8, 31 }, { 8, 29 }, { 8, 27 },
  { 8, 25 }, { 8, 23 }, { 8, 21 }, { 8, 19 }, { 8, 17 }, { 8, 15 }, { 8, 13 },
  { 8, 11 }, { 8, 9 },  { 8, 7 },  { 8, 5 },  { 8, 3 },  { 8, 1 },  { 7, 15 },
  { 7, 13 }, { 7, 11 }, { 7, 9 },  { 7, 7 },  { 7, 5 },  { 7, 3 },  { 7, 1 },
  { 6, 7 },  { 6, 5 },  { 6, 3 },  { 6, 1 },  { 5, 3 },  { 5, 1 },  { 4, 1 },
  { 3, 1 },  { 2, 1 },  { 1, 1 },  { 0, 0 },  { 1, 0 },  { 2, 0 },  { 3, 0 },
  { 4, 0 },  { 5, 0 },  { 5, 2 },  { 6, 0 },  { 6, 2 },  { 6, 4 },  { 6, 6 },
  { 7, 0 },  { 7, 2 },  { 7, 4 },  { 7, 6 },  { 7, 8 },  { 7, 10 }, { 7, 12 },
  { 7, 14 }, { 8, 0 },  { 8, 2 },  { 8, 4 },  { 8, 6 },  { 8, 8 },  { 8, 10 },
  { 8, 12 }, { 8, 14 }, { 8, 16 }, { 8, 18 }, { 8, 20 }, { 8, 22 }, { 8, 24 },
  { 8, 26 }, { 8, 28 }, { 8, 30 }, { 9, 0 },  { 9, 2 },  { 9, 4 },  { 9, 6 },
  { 9, 8 },  { 9, 10 }, { 9, 12 }, { 9, 14 }, { 9, 16 }, { 9, 18 }, { 9, 20 },
  { 9, 22 }, { 9, 24 }, { 9, 26 }, { 9, 28 }, { 9, 30 }, { 9, 32 }, { 9, 34 },
  { 9, 36 }, { 9, 38 }, { 9, 40 }, { 9, 42 }, { 9, 44 }, { 9, 46 }, { 9, 48 },
  { 9, 50 }, { 9, 52 }, { 9, 54 }, { 9, 56 }, { 9, 58 }, { 9, 60 }, { 9, 62 }
};
const TOKENVALUE *vp9_dct_cat_lt_10_value_tokens =
    dct_cat_lt_10_value_tokens +
    (sizeof(dct_cat_lt_10_value_tokens) / sizeof(*dct_cat_lt_10_value_tokens)) /
        2;
// The corresponding costs of the extrabits for the tokens in the above table
// are stored in the table below. The values are obtained from looking up the
// entry for the specified extrabits in the table corresponding to the token
// (as defined in cost element vp9_extra_bits)
// e.g. {9, 63} maps to cat5_cost[63 >> 1], {1, 1} maps to sign_cost[1 >> 1]
static const int dct_cat_lt_10_value_cost[] = {
  3773, 3750, 3704, 3681, 3623, 3600, 3554, 3531, 3432, 3409, 3363, 3340, 3282,
  3259, 3213, 3190, 3136, 3113, 3067, 3044, 2986, 2963, 2917, 2894, 2795, 2772,
  2726, 2703, 2645, 2622, 2576, 2553, 3197, 3116, 3058, 2977, 2881, 2800, 2742,
  2661, 2615, 2534, 2476, 2395, 2299, 2218, 2160, 2079, 2566, 2427, 2334, 2195,
  2023, 1884, 1791, 1652, 1893, 1696, 1453, 1256, 1229, 864,  512,  512,  512,
  512,  0,    512,  512,  512,  512,  864,  1229, 1256, 1453, 1696, 1893, 1652,
  1791, 1884, 2023, 2195, 2334, 2427, 2566, 2079, 2160, 2218, 2299, 2395, 2476,
  2534, 2615, 2661, 2742, 2800, 2881, 2977, 3058, 3116, 3197, 2553, 2576, 2622,
  2645, 2703, 2726, 2772, 2795, 2894, 2917, 2963, 2986, 3044, 3067, 3113, 3136,
  3190, 3213, 3259, 3282, 3340, 3363, 3409, 3432, 3531, 3554, 3600, 3623, 3681,
  3704, 3750, 3773,
};
const int *vp9_dct_cat_lt_10_value_cost =
    dct_cat_lt_10_value_cost +
    (sizeof(dct_cat_lt_10_value_cost) / sizeof(*dct_cat_lt_10_value_cost)) / 2;

// Array indices are identical to previously-existing CONTEXT_NODE indices
/* clang-format off */
const vpx_tree_index vp9_coef_tree[TREE_SIZE(ENTROPY_TOKENS)] = {
  -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
  -CATEGORY1_TOKEN, -CATEGORY2_TOKEN,  // 7  = CAT_ONE
  18, 20,                              // 8  = CAT_THREEFOUR
  -CATEGORY3_TOKEN, -CATEGORY4_TOKEN,  // 9  = CAT_THREE
  -CATEGORY5_TOKEN, -CATEGORY6_TOKEN   // 10 = CAT_FIVE
};
/* clang-format on */

static const int16_t zero_cost[] = { 0 };
static const int16_t sign_cost[1] = { 512 };
static const int16_t cat1_cost[1 << 1] = { 864, 1229 };
static const int16_t cat2_cost[1 << 2] = { 1256, 1453, 1696, 1893 };
static const int16_t cat3_cost[1 << 3] = { 1652, 1791, 1884, 2023,
                                           2195, 2334, 2427, 2566 };
static const int16_t cat4_cost[1 << 4] = { 2079, 2160, 2218, 2299, 2395, 2476,
                                           2534, 2615, 2661, 2742, 2800, 2881,
                                           2977, 3058, 3116, 3197 };
static const int16_t cat5_cost[1 << 5] = {
  2553, 2576, 2622, 2645, 2703, 2726, 2772, 2795, 2894, 2917, 2963,
  2986, 3044, 3067, 3113, 3136, 3190, 3213, 3259, 3282, 3340, 3363,
  3409, 3432, 3531, 3554, 3600, 3623, 3681, 3704, 3750, 3773
};
const int16_t vp9_cat6_low_cost[256] = {
  3378, 3390, 3401, 3413, 3435, 3447, 3458, 3470, 3517, 3529, 3540, 3552, 3574,
  3586, 3597, 3609, 3671, 3683, 3694, 3706, 3728, 3740, 3751, 3763, 3810, 3822,
  3833, 3845, 3867, 3879, 3890, 3902, 3973, 3985, 3996, 4008, 4030, 4042, 4053,
  4065, 4112, 4124, 4135, 4147, 4169, 4181, 4192, 4204, 4266, 4278, 4289, 4301,
  4323, 4335, 4346, 4358, 4405, 4417, 4428, 4440, 4462, 4474, 4485, 4497, 4253,
  4265, 4276, 4288, 4310, 4322, 4333, 4345, 4392, 4404, 4415, 4427, 4449, 4461,
  4472, 4484, 4546, 4558, 4569, 4581, 4603, 4615, 4626, 4638, 4685, 4697, 4708,
  4720, 4742, 4754, 4765, 4777, 4848, 4860, 4871, 4883, 4905, 4917, 4928, 4940,
  4987, 4999, 5010, 5022, 5044, 5056, 5067, 5079, 5141, 5153, 5164, 5176, 5198,
  5210, 5221, 5233, 5280, 5292, 5303, 5315, 5337, 5349, 5360, 5372, 4988, 5000,
  5011, 5023, 5045, 5057, 5068, 5080, 5127, 5139, 5150, 5162, 5184, 5196, 5207,
  5219, 5281, 5293, 5304, 5316, 5338, 5350, 5361, 5373, 5420, 5432, 5443, 5455,
  5477, 5489, 5500, 5512, 5583, 5595, 5606, 5618, 5640, 5652, 5663, 5675, 5722,
  5734, 5745, 5757, 5779, 5791, 5802, 5814, 5876, 5888, 5899, 5911, 5933, 5945,
  5956, 5968, 6015, 6027, 6038, 6050, 6072, 6084, 6095, 6107, 5863, 5875, 5886,
  5898, 5920, 5932, 5943, 5955, 6002, 6014, 6025, 6037, 6059, 6071, 6082, 6094,
  6156, 6168, 6179, 6191, 6213, 6225, 6236, 6248, 6295, 6307, 6318, 6330, 6352,
  6364, 6375, 6387, 6458, 6470, 6481, 6493, 6515, 6527, 6538, 6550, 6597, 6609,
  6620, 6632, 6654, 6666, 6677, 6689, 6751, 6763, 6774, 6786, 6808, 6820, 6831,
  6843, 6890, 6902, 6913, 6925, 6947, 6959, 6970, 6982
};
const uint16_t vp9_cat6_high_cost[64] = {
  88,    2251,  2727,  4890,  3148,  5311,  5787,  7950,  3666,  5829,  6305,
  8468,  6726,  8889,  9365,  11528, 3666,  5829,  6305,  8468,  6726,  8889,
  9365,  11528, 7244,  9407,  9883,  12046, 10304, 12467, 12943, 15106, 3666,
  5829,  6305,  8468,  6726,  8889,  9365,  11528, 7244,  9407,  9883,  12046,
  10304, 12467, 12943, 15106, 7244,  9407,  9883,  12046, 10304, 12467, 12943,
  15106, 10822, 12985, 13461, 15624, 13882, 16045, 16521, 18684
};

#if CONFIG_VP9_HIGHBITDEPTH
const uint16_t vp9_cat6_high10_high_cost[256] = {
  94,    2257,  2733,  4896,  3154,  5317,  5793,  7956,  3672,  5835,  6311,
  8474,  6732,  8895,  9371,  11534, 3672,  5835,  6311,  8474,  6732,  8895,
  9371,  11534, 7250,  9413,  9889,  12052, 10310, 12473, 12949, 15112, 3672,
  5835,  6311,  8474,  6732,  8895,  9371,  11534, 7250,  9413,  9889,  12052,
  10310, 12473, 12949, 15112, 7250,  9413,  9889,  12052, 10310, 12473, 12949,
  15112, 10828, 12991, 13467, 15630, 13888, 16051, 16527, 18690, 4187,  6350,
  6826,  8989,  7247,  9410,  9886,  12049, 7765,  9928,  10404, 12567, 10825,
  12988, 13464, 15627, 7765,  9928,  10404, 12567, 10825, 12988, 13464, 15627,
  11343, 13506, 13982, 16145, 14403, 16566, 17042, 19205, 7765,  9928,  10404,
  12567, 10825, 12988, 13464, 15627, 11343, 13506, 13982, 16145, 14403, 16566,
  17042, 19205, 11343, 13506, 13982, 16145, 14403, 16566, 17042, 19205, 14921,
  17084, 17560, 19723, 17981, 20144, 20620, 22783, 4187,  6350,  6826,  8989,
  7247,  9410,  9886,  12049, 7765,  9928,  10404, 12567, 10825, 12988, 13464,
  15627, 7765,  9928,  10404, 12567, 10825, 12988, 13464, 15627, 11343, 13506,
  13982, 16145, 14403, 16566, 17042, 19205, 7765,  9928,  10404, 12567, 10825,
  12988, 13464, 15627, 11343, 13506, 13982, 16145, 14403, 16566, 17042, 19205,
  11343, 13506, 13982, 16145, 14403, 16566, 17042, 19205, 14921, 17084, 17560,
  19723, 17981, 20144, 20620, 22783, 8280,  10443, 10919, 13082, 11340, 13503,
  13979, 16142, 11858, 14021, 14497, 16660, 14918, 17081, 17557, 19720, 11858,
  14021, 14497, 16660, 14918, 17081, 17557, 19720, 15436, 17599, 18075, 20238,
  18496, 20659, 21135, 23298, 11858, 14021, 14497, 16660, 14918, 17081, 17557,
  19720, 15436, 17599, 18075, 20238, 18496, 20659, 21135, 23298, 15436, 17599,
  18075, 20238, 18496, 20659, 21135, 23298, 19014, 21177, 21653, 23816, 22074,
  24237, 24713, 26876
};
const uint16_t vp9_cat6_high12_high_cost[1024] = {
  100,   2263,  2739,  4902,  3160,  5323,  5799,  7962,  3678,  5841,  6317,
  8480,  6738,  8901,  9377,  11540, 3678,  5841,  6317,  8480,  6738,  8901,
  9377,  11540, 7256,  9419,  9895,  12058, 10316, 12479, 12955, 15118, 3678,
  5841,  6317,  8480,  6738,  8901,  9377,  11540, 7256,  9419,  9895,  12058,
  10316, 12479, 12955, 15118, 7256,  9419,  9895,  12058, 10316, 12479, 12955,
  15118, 10834, 12997, 13473, 15636, 13894, 16057, 16533, 18696, 4193,  6356,
  6832,  8995,  7253,  9416,  9892,  12055, 7771,  9934,  10410, 12573, 10831,
  12994, 13470, 15633, 7771,  9934,  10410, 12573, 10831, 12994, 13470, 15633,
  11349, 13512, 13988, 16151, 14409, 16572, 17048, 19211, 7771,  9934,  10410,
  12573, 10831, 12994, 13470, 15633, 11349, 13512, 13988, 16151, 14409, 16572,
  17048, 19211, 11349, 13512, 13988, 16151, 14409, 16572, 17048, 19211, 14927,
  17090, 17566, 19729, 17987, 20150, 20626, 22789, 4193,  6356,  6832,  8995,
  7253,  9416,  9892,  12055, 7771,  9934,  10410, 12573, 10831, 12994, 13470,
  15633, 7771,  9934,  10410, 12573, 10831, 12994, 13470, 15633, 11349, 13512,
  13988, 16151, 14409, 16572, 17048, 19211, 7771,  9934,  10410, 12573, 10831,
  12994, 13470, 15633, 11349, 13512, 13988, 16151, 14409, 16572, 17048, 19211,
  11349, 13512, 13988, 16151, 14409, 16572, 17048, 19211, 14927, 17090, 17566,
  19729, 17987, 20150, 20626, 22789, 8286,  10449, 10925, 13088, 11346, 13509,
  13985, 16148, 11864, 14027, 14503, 16666, 14924, 17087, 17563, 19726, 11864,
  14027, 14503, 16666, 14924, 17087, 17563, 19726, 15442, 17605, 18081, 20244,
  18502, 20665, 21141, 23304, 11864, 14027, 14503, 16666, 14924, 17087, 17563,
  19726, 15442, 17605, 18081, 20244, 18502, 20665, 21141, 23304, 15442, 17605,
  18081, 20244, 18502, 20665, 21141, 23304, 19020, 21183, 21659, 23822, 22080,
  24243, 24719, 26882, 4193,  6356,  6832,  8995,  7253,  9416,  9892,  12055,
  7771,  9934,  10410, 12573, 10831, 12994, 13470, 15633, 7771,  9934,  10410,
  12573, 10831, 12994, 13470, 15633, 11349, 13512, 13988, 16151, 14409, 16572,
  17048, 19211, 7771,  9934,  10410, 12573, 10831, 12994, 13470, 15633, 11349,
  13512, 13988, 16151, 14409, 16572, 17048, 19211, 11349, 13512, 13988, 16151,
  14409, 16572, 17048, 19211, 14927, 17090, 17566, 19729, 17987, 20150, 20626,
  22789, 8286,  10449, 10925, 13088, 11346, 13509, 13985, 16148, 11864, 14027,
  14503, 16666, 14924, 17087, 17563, 19726, 11864, 14027, 14503, 16666, 14924,
  17087, 17563, 19726, 15442, 17605, 18081, 20244, 18502, 20665, 21141, 23304,
  11864, 14027, 14503, 16666, 14924, 17087, 17563, 19726, 15442, 17605, 18081,
  20244, 18502, 20665, 21141, 23304, 15442, 17605, 18081, 20244, 18502, 20665,
  21141, 23304, 19020, 21183, 21659, 23822, 22080, 24243, 24719, 26882, 8286,
  10449, 10925, 13088, 11346, 13509, 13985, 16148, 11864, 14027, 14503, 16666,
  14924, 17087, 17563, 19726, 11864, 14027, 14503, 16666, 14924, 17087, 17563,
  19726, 15442, 17605, 18081, 20244, 18502, 20665, 21141, 23304, 11864, 14027,
  14503, 16666, 14924, 17087, 17563, 19726, 15442, 17605, 18081, 20244, 18502,
  20665, 21141, 23304, 15442, 17605, 18081, 20244, 18502, 20665, 21141, 23304,
  19020, 21183, 21659, 23822, 22080, 24243, 24719, 26882, 12379, 14542, 15018,
  17181, 15439, 17602, 18078, 20241, 15957, 18120, 18596, 20759, 19017, 21180,
  21656, 23819, 15957, 18120, 18596, 20759, 19017, 21180, 21656, 23819, 19535,
  21698, 22174, 24337, 22595, 24758, 25234, 27397, 15957, 18120, 18596, 20759,
  19017, 21180, 21656, 23819, 19535, 21698, 22174, 24337, 22595, 24758, 25234,
  27397, 19535, 21698, 22174, 24337, 22595, 24758, 25234, 27397, 23113, 25276,
  25752, 27915, 26173, 28336, 28812, 30975, 4193,  6356,  6832,  8995,  7253,
  9416,  9892,  12055, 7771,  9934,  10410, 12573, 10831, 12994, 13470, 15633,
  7771,  9934,  10410, 12573, 10831, 12994, 13470, 15633, 11349, 13512, 13988,
  16151, 14409, 16572, 17048, 19211, 7771,  9934,  10410, 12573, 10831, 12994,
  13470, 15633, 11349, 13512, 13988, 16151, 14409, 16572, 17048, 19211, 11349,
  13512, 13988, 16151, 14409, 16572, 17048, 19211, 14927, 17090, 17566, 19729,
  17987, 20150, 20626, 22789, 8286,  10449, 10925, 13088, 11346, 13509, 13985,
  16148, 11864, 14027, 14503, 16666, 14924, 17087, 17563, 19726, 11864, 14027,
  14503, 16666, 14924, 17087, 17563, 19726, 15442, 17605, 18081, 20244, 18502,
  20665, 21141, 23304, 11864, 14027, 14503, 16666, 14924, 17087, 17563, 19726,
  15442, 17605, 18081, 20244, 18502, 20665, 21141, 23304, 15442, 17605, 18081,
  20244, 18502, 20665, 21141, 23304, 19020, 21183, 21659, 23822, 22080, 24243,
  24719, 26882, 8286,  10449, 10925, 13088, 11346, 13509, 13985, 16148, 11864,
  14027, 14503, 16666, 14924, 17087, 17563, 19726, 11864, 14027, 14503, 16666,
  14924, 17087, 17563, 19726, 15442, 17605, 18081, 20244, 18502, 20665, 21141,
  23304, 11864, 14027, 14503, 16666, 14924, 17087, 17563, 19726, 15442, 17605,
  18081, 20244, 18502, 20665, 21141, 23304, 15442, 17605, 18081, 20244, 18502,
  20665, 21141, 23304, 19020, 21183, 21659, 23822, 22080, 24243, 24719, 26882,
  12379, 14542, 15018, 17181, 15439, 17602, 18078, 20241, 15957, 18120, 18596,
  20759, 19017, 21180, 21656, 23819, 15957, 18120, 18596, 20759, 19017, 21180,
  21656, 23819, 19535, 21698, 22174, 24337, 22595, 24758, 25234, 27397, 15957,
  18120, 18596, 20759, 19017, 21180, 21656, 23819, 19535, 21698, 22174, 24337,
  22595, 24758, 25234, 27397, 19535, 21698, 22174, 24337, 22595, 24758, 25234,
  27397, 23113, 25276, 25752, 27915, 26173, 28336, 28812, 30975, 8286,  10449,
  10925, 13088, 11346, 13509, 13985, 16148, 11864, 14027, 14503, 16666, 14924,
  17087, 17563, 19726, 11864, 14027, 14503, 16666, 14924, 17087, 17563, 19726,
  15442, 17605, 18081, 20244, 18502, 20665, 21141, 23304, 11864, 14027, 14503,
  16666, 14924, 17087, 17563, 19726, 15442, 17605, 18081, 20244, 18502, 20665,
  21141, 23304, 15442, 17605, 18081, 20244, 18502, 20665, 21141, 23304, 19020,
  21183, 21659, 23822, 22080, 24243, 24719, 26882, 12379, 14542, 15018, 17181,
  15439, 17602, 18078, 20241, 15957, 18120, 18596, 20759, 19017, 21180, 21656,
  23819, 15957, 18120, 18596, 20759, 19017, 21180, 21656, 23819, 19535, 21698,
  22174, 24337, 22595, 24758, 25234, 27397, 15957, 18120, 18596, 20759, 19017,
  21180, 21656, 23819, 19535, 21698, 22174, 24337, 22595, 24758, 25234, 27397,
  19535, 21698, 22174, 24337, 22595, 24758, 25234, 27397, 23113, 25276, 25752,
  27915, 26173, 28336, 28812, 30975, 12379, 14542, 15018, 17181, 15439, 17602,
  18078, 20241, 15957, 18120, 18596, 20759, 19017, 21180, 21656, 23819, 15957,
  18120, 18596, 20759, 19017, 21180, 21656, 23819, 19535, 21698, 22174, 24337,
  22595, 24758, 25234, 27397, 15957, 18120, 18596, 20759, 19017, 21180, 21656,
  23819, 19535, 21698, 22174, 24337, 22595, 24758, 25234, 27397, 19535, 21698,
  22174, 24337, 22595, 24758, 25234, 27397, 23113, 25276, 25752, 27915, 26173,
  28336, 28812, 30975, 16472, 18635, 19111, 21274, 19532, 21695, 22171, 24334,
  20050, 22213, 22689, 24852, 23110, 25273, 25749, 27912, 20050, 22213, 22689,
  24852, 23110, 25273, 25749, 27912, 23628, 25791, 26267, 28430, 26688, 28851,
  29327, 31490, 20050, 22213, 22689, 24852, 23110, 25273, 25749, 27912, 23628,
  25791, 26267, 28430, 26688, 28851, 29327, 31490, 23628, 25791, 26267, 28430,
  26688, 28851, 29327, 31490, 27206, 29369, 29845, 32008, 30266, 32429, 32905,
  35068
};
#endif

const vp9_extra_bit vp9_extra_bits[ENTROPY_TOKENS] = {
  { 0, 0, 0, zero_cost },                         // ZERO_TOKEN
  { 0, 0, 1, sign_cost },                         // ONE_TOKEN
  { 0, 0, 2, sign_cost },                         // TWO_TOKEN
  { 0, 0, 3, sign_cost },                         // THREE_TOKEN
  { 0, 0, 4, sign_cost },                         // FOUR_TOKEN
  { vp9_cat1_prob, 1, CAT1_MIN_VAL, cat1_cost },  // CATEGORY1_TOKEN
  { vp9_cat2_prob, 2, CAT2_MIN_VAL, cat2_cost },  // CATEGORY2_TOKEN
  { vp9_cat3_prob, 3, CAT3_MIN_VAL, cat3_cost },  // CATEGORY3_TOKEN
  { vp9_cat4_prob, 4, CAT4_MIN_VAL, cat4_cost },  // CATEGORY4_TOKEN
  { vp9_cat5_prob, 5, CAT5_MIN_VAL, cat5_cost },  // CATEGORY5_TOKEN
  { vp9_cat6_prob, 14, CAT6_MIN_VAL, 0 },         // CATEGORY6_TOKEN
  { 0, 0, 0, zero_cost }                          // EOB_TOKEN
};

#if CONFIG_VP9_HIGHBITDEPTH
const vp9_extra_bit vp9_extra_bits_high10[ENTROPY_TOKENS] = {
  { 0, 0, 0, zero_cost },                             // ZERO
  { 0, 0, 1, sign_cost },                             // ONE
  { 0, 0, 2, sign_cost },                             // TWO
  { 0, 0, 3, sign_cost },                             // THREE
  { 0, 0, 4, sign_cost },                             // FOUR
  { vp9_cat1_prob, 1, CAT1_MIN_VAL, cat1_cost },      // CAT1
  { vp9_cat2_prob, 2, CAT2_MIN_VAL, cat2_cost },      // CAT2
  { vp9_cat3_prob, 3, CAT3_MIN_VAL, cat3_cost },      // CAT3
  { vp9_cat4_prob, 4, CAT4_MIN_VAL, cat4_cost },      // CAT4
  { vp9_cat5_prob, 5, CAT5_MIN_VAL, cat5_cost },      // CAT5
  { vp9_cat6_prob_high12 + 2, 16, CAT6_MIN_VAL, 0 },  // CAT6
  { 0, 0, 0, zero_cost }                              // EOB
};
const vp9_extra_bit vp9_extra_bits_high12[ENTROPY_TOKENS] = {
  { 0, 0, 0, zero_cost },                         // ZERO
  { 0, 0, 1, sign_cost },                         // ONE
  { 0, 0, 2, sign_cost },                         // TWO
  { 0, 0, 3, sign_cost },                         // THREE
  { 0, 0, 4, sign_cost },                         // FOUR
  { vp9_cat1_prob, 1, CAT1_MIN_VAL, cat1_cost },  // CAT1
  { vp9_cat2_prob, 2, CAT2_MIN_VAL, cat2_cost },  // CAT2
  { vp9_cat3_prob, 3, CAT3_MIN_VAL, cat3_cost },  // CAT3
  { vp9_cat4_prob, 4, CAT4_MIN_VAL, cat4_cost },  // CAT4
  { vp9_cat5_prob, 5, CAT5_MIN_VAL, cat5_cost },  // CAT5
  { vp9_cat6_prob_high12, 18, CAT6_MIN_VAL, 0 },  // CAT6
  { 0, 0, 0, zero_cost }                          // EOB
};
#endif

const struct vp9_token vp9_coef_encodings[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 }
};

struct tokenize_b_args {
  VP9_COMP *cpi;
  ThreadData *td;
  TOKENEXTRA **tp;
};

static void set_entropy_context_b(int plane, int block, int row, int col,
                                  BLOCK_SIZE plane_bsize, TX_SIZE tx_size,
                                  void *arg) {
  struct tokenize_b_args *const args = arg;
  ThreadData *const td = args->td;
  MACROBLOCK *const x = &td->mb;
  MACROBLOCKD *const xd = &x->e_mbd;
  struct macroblock_plane *p = &x->plane[plane];
  struct macroblockd_plane *pd = &xd->plane[plane];
  vp9_set_contexts(xd, pd, plane_bsize, tx_size, p->eobs[block] > 0, col, row);
}

static INLINE void add_token(TOKENEXTRA **t, const vpx_prob *context_tree,
                             int16_t token, EXTRABIT extra,
                             unsigned int *counts) {
  (*t)->context_tree = context_tree;
  (*t)->token = token;
  (*t)->extra = extra;
  (*t)++;
  ++counts[token];
}

static INLINE void add_token_no_extra(TOKENEXTRA **t,
                                      const vpx_prob *context_tree,
                                      int16_t token, unsigned int *counts) {
  (*t)->context_tree = context_tree;
  (*t)->token = token;
  (*t)++;
  ++counts[token];
}

static void tokenize_b(int plane, int block, int row, int col,
                       BLOCK_SIZE plane_bsize, TX_SIZE tx_size, void *arg) {
  struct tokenize_b_args *const args = arg;
  VP9_COMP *cpi = args->cpi;
  ThreadData *const td = args->td;
  MACROBLOCK *const x = &td->mb;
  MACROBLOCKD *const xd = &x->e_mbd;
  TOKENEXTRA **tp = args->tp;
  uint8_t token_cache[32 * 32];
  struct macroblock_plane *p = &x->plane[plane];
  struct macroblockd_plane *pd = &xd->plane[plane];
  MODE_INFO *mi = xd->mi[0];
  int pt; /* near block/prev token context index */
  int c;
  TOKENEXTRA *t = *tp; /* store tokens starting here */
  int eob = p->eobs[block];
  const PLANE_TYPE type = get_plane_type(plane);
  const tran_low_t *qcoeff = BLOCK_OFFSET(p->qcoeff, block);
  const int16_t *scan, *nb;
  const ScanOrder *so;
  const int ref = is_inter_block(mi);
  unsigned int(*const counts)[COEFF_CONTEXTS][ENTROPY_TOKENS] =
      td->rd_counts.coef_counts[tx_size][type][ref];
  vpx_prob(*const coef_probs)[COEFF_CONTEXTS][UNCONSTRAINED_NODES] =
      cpi->common.fc->coef_probs[tx_size][type][ref];
  unsigned int(*const eob_branch)[COEFF_CONTEXTS] =
      td->counts->eob_branch[tx_size][type][ref];
  const uint8_t *const band = get_band_translate(tx_size);
  const int tx_eob = 16 << (tx_size << 1);
  int16_t token;
  EXTRABIT extra;
  pt = get_entropy_context(tx_size, pd->above_context + col,
                           pd->left_context + row);
  so = get_scan(xd, tx_size, type, block);
  scan = so->scan;
  nb = so->neighbors;
  c = 0;

  while (c < eob) {
    int v = 0;
    v = qcoeff[scan[c]];
    ++eob_branch[band[c]][pt];

    while (!v) {
      add_token_no_extra(&t, coef_probs[band[c]][pt], ZERO_TOKEN,
                         counts[band[c]][pt]);

      token_cache[scan[c]] = 0;
      ++c;
      pt = get_coef_context(nb, token_cache, c);
      v = qcoeff[scan[c]];
    }

    vp9_get_token_extra(v, &token, &extra);

    add_token(&t, coef_probs[band[c]][pt], token, extra, counts[band[c]][pt]);

    token_cache[scan[c]] = vp9_pt_energy_class[token];
    ++c;
    pt = get_coef_context(nb, token_cache, c);
  }
  if (c < tx_eob) {
    ++eob_branch[band[c]][pt];
    add_token_no_extra(&t, coef_probs[band[c]][pt], EOB_TOKEN,
                       counts[band[c]][pt]);
  }

  *tp = t;

  vp9_set_contexts(xd, pd, plane_bsize, tx_size, c > 0, col, row);
}

struct is_skippable_args {
  uint16_t *eobs;
  int *skippable;
};

static void is_skippable(int plane, int block, int row, int col,
                         BLOCK_SIZE plane_bsize, TX_SIZE tx_size, void *argv) {
  struct is_skippable_args *args = argv;
  (void)plane;
  (void)plane_bsize;
  (void)tx_size;
  (void)row;
  (void)col;
  args->skippable[0] &= (!args->eobs[block]);
}

// TODO(yaowu): rewrite and optimize this function to remove the usage of
//              vp9_foreach_transform_block() and simplify is_skippable().
int vp9_is_skippable_in_plane(MACROBLOCK *x, BLOCK_SIZE bsize, int plane) {
  int result = 1;
  struct is_skippable_args args = { x->plane[plane].eobs, &result };
  vp9_foreach_transformed_block_in_plane(&x->e_mbd, bsize, plane, is_skippable,
                                         &args);
  return result;
}

static void has_high_freq_coeff(int plane, int block, int row, int col,
                                BLOCK_SIZE plane_bsize, TX_SIZE tx_size,
                                void *argv) {
  struct is_skippable_args *args = argv;
  int eobs = (tx_size == TX_4X4) ? 3 : 10;
  (void)plane;
  (void)plane_bsize;
  (void)row;
  (void)col;
  *(args->skippable) |= (args->eobs[block] > eobs);
}

int vp9_has_high_freq_in_plane(MACROBLOCK *x, BLOCK_SIZE bsize, int plane) {
  int result = 0;
  struct is_skippable_args args = { x->plane[plane].eobs, &result };
  vp9_foreach_transformed_block_in_plane(&x->e_mbd, bsize, plane,
                                         has_high_freq_coeff, &args);
  return result;
}

void vp9_tokenize_sb(VP9_COMP *cpi, ThreadData *td, TOKENEXTRA **t, int dry_run,
                     int seg_skip, BLOCK_SIZE bsize) {
  MACROBLOCK *const x = &td->mb;
  MACROBLOCKD *const xd = &x->e_mbd;
  MODE_INFO *const mi = xd->mi[0];
  const int ctx = vp9_get_skip_context(xd);
  struct tokenize_b_args arg = { cpi, td, t };

  if (seg_skip) {
    assert(mi->skip);
  }

  if (mi->skip) {
    if (!dry_run && !seg_skip) ++td->counts->skip[ctx][1];
    reset_skip_context(xd, bsize);
    return;
  }

  if (!dry_run) {
    ++td->counts->skip[ctx][0];
    vp9_foreach_transformed_block(xd, bsize, tokenize_b, &arg);
  } else {
    vp9_foreach_transformed_block(xd, bsize, set_entropy_context_b, &arg);
  }
}