xref: /external/webp/src/dec/tree.c

// Copyright 2010 Google Inc.
//
// This code is licensed under the same terms as WebM:
//  Software License Agreement:  http://www.webmproject.org/license/software/
//  Additional IP Rights Grant:  http://www.webmproject.org/license/additional/
// -----------------------------------------------------------------------------
//
// Coding trees and probas
//
// Author: Skal (pascal.massimino@gmail.com)

#include "vp8i.h"

#define USE_GENERIC_TREE

#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif

#ifdef USE_GENERIC_TREE
static const int8_t kYModesIntra4[18] = {
  -B_DC_PRED, 1,
    -B_TM_PRED, 2,
      -B_VE_PRED, 3,
        4, 6,
          -B_HE_PRED, 5,
            -B_RD_PRED, -B_VR_PRED,
        -B_LD_PRED, 7,
          -B_VL_PRED, 8,
            -B_HD_PRED, -B_HU_PRED
};
#endif

#ifndef ONLY_KEYFRAME_CODE

// inter prediction modes
enum {
  LEFT4 = 0, ABOVE4 = 1, ZERO4 = 2, NEW4 = 3,
  NEARESTMV, NEARMV, ZEROMV, NEWMV, SPLITMV };

static const int8_t kYModesInter[8] = {
  -DC_PRED, 1,
    2, 3,
      -V_PRED, -H_PRED,
      -TM_PRED, -B_PRED
};

static const int8_t kMBSplit[6] = {
  -3, 1,
    -2, 2,
      -0, -1
};

static const int8_t kMVRef[8] = {
  -ZEROMV, 1,
    -NEARESTMV, 2,
      -NEARMV, 3,
        -NEWMV, -SPLITMV
};

static const int8_t kMVRef4[6] = {
  -LEFT4, 1
    -ABOVE4, 2
      -ZERO4, -NEW4
};
#endif

//-----------------------------------------------------------------------------
// Default probabilities

// Inter
#ifndef ONLY_KEYFRAME_CODE
static const uint8_t kYModeProbaInter0[4] = { 112, 86, 140, 37 };
static const uint8_t kUVModeProbaInter0[3] = { 162, 101, 204 };
static const uint8_t kMVProba0[2][NUM_MV_PROBAS] = {
  { 162, 128, 225, 146, 172, 147, 214,  39,
    156, 128, 129, 132,  75, 145, 178, 206,
    239, 254, 254 },
  { 164, 128, 204, 170, 119, 235, 140, 230,
    228, 128, 130, 130,  74, 148, 180, 203,
    236, 254, 254 }
};
#endif

// Paragraph 13.5
static const uint8_t
  CoeffsProba0[NUM_TYPES][NUM_BANDS][NUM_CTX][NUM_PROBAS] = {
  // genereated using vp8_default_coef_probs() in entropy.c:129
  { { { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 },
      { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 },
      { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 }
    },
    { { 253, 136, 254, 255, 228, 219, 128, 128, 128, 128, 128 },
      { 189, 129, 242, 255, 227, 213, 255, 219, 128, 128, 128 },
      { 106, 126, 227, 252, 214, 209, 255, 255, 128, 128, 128 }
    },
    { { 1, 98, 248, 255, 236, 226, 255, 255, 128, 128, 128 },
      { 181, 133, 238, 254, 221, 234, 255, 154, 128, 128, 128 },
      { 78, 134, 202, 247, 198, 180, 255, 219, 128, 128, 128 },
    },
    { { 1, 185, 249, 255, 243, 255, 128, 128, 128, 128, 128 },
      { 184, 150, 247, 255, 236, 224, 128, 128, 128, 128, 128 },
      { 77, 110, 216, 255, 236, 230, 128, 128, 128, 128, 128 },
    },
    { { 1, 101, 251, 255, 241, 255, 128, 128, 128, 128, 128 },
      { 170, 139, 241, 252, 236, 209, 255, 255, 128, 128, 128 },
      { 37, 116, 196, 243, 228, 255, 255, 255, 128, 128, 128 }
    },
    { { 1, 204, 254, 255, 245, 255, 128, 128, 128, 128, 128 },
      { 207, 160, 250, 255, 238, 128, 128, 128, 128, 128, 128 },
      { 102, 103, 231, 255, 211, 171, 128, 128, 128, 128, 128 }
    },
    { { 1, 152, 252, 255, 240, 255, 128, 128, 128, 128, 128 },
      { 177, 135, 243, 255, 234, 225, 128, 128, 128, 128, 128 },
      { 80, 129, 211, 255, 194, 224, 128, 128, 128, 128, 128 }
    },
    { { 1, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 },
      { 246, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 },
      { 255, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 }
    }
  },
  { { { 198, 35, 237, 223, 193, 187, 162, 160, 145, 155, 62 },
      { 131, 45, 198, 221, 172, 176, 220, 157, 252, 221, 1 },
      { 68, 47, 146, 208, 149, 167, 221, 162, 255, 223, 128 }
    },
    { { 1, 149, 241, 255, 221, 224, 255, 255, 128, 128, 128 },
      { 184, 141, 234, 253, 222, 220, 255, 199, 128, 128, 128 },
      { 81, 99, 181, 242, 176, 190, 249, 202, 255, 255, 128 }
    },
    { { 1, 129, 232, 253, 214, 197, 242, 196, 255, 255, 128 },
      { 99, 121, 210, 250, 201, 198, 255, 202, 128, 128, 128 },
      { 23, 91, 163, 242, 170, 187, 247, 210, 255, 255, 128 }
    },
    { { 1, 200, 246, 255, 234, 255, 128, 128, 128, 128, 128 },
      { 109, 178, 241, 255, 231, 245, 255, 255, 128, 128, 128 },
      { 44, 130, 201, 253, 205, 192, 255, 255, 128, 128, 128 }
    },
    { { 1, 132, 239, 251, 219, 209, 255, 165, 128, 128, 128 },
      { 94, 136, 225, 251, 218, 190, 255, 255, 128, 128, 128 },
      { 22, 100, 174, 245, 186, 161, 255, 199, 128, 128, 128 }
    },
    { { 1, 182, 249, 255, 232, 235, 128, 128, 128, 128, 128 },
      { 124, 143, 241, 255, 227, 234, 128, 128, 128, 128, 128 },
      { 35, 77, 181, 251, 193, 211, 255, 205, 128, 128, 128 }
    },
    { { 1, 157, 247, 255, 236, 231, 255, 255, 128, 128, 128 },
      { 121, 141, 235, 255, 225, 227, 255, 255, 128, 128, 128 },
      { 45, 99, 188, 251, 195, 217, 255, 224, 128, 128, 128 }
    },
    { { 1, 1, 251, 255, 213, 255, 128, 128, 128, 128, 128 },
      { 203, 1, 248, 255, 255, 128, 128, 128, 128, 128, 128 },
      { 137, 1, 177, 255, 224, 255, 128, 128, 128, 128, 128 }
    }
  },
  { { { 253, 9, 248, 251, 207, 208, 255, 192, 128, 128, 128 },
      { 175, 13, 224, 243, 193, 185, 249, 198, 255, 255, 128 },
      { 73, 17, 171, 221, 161, 179, 236, 167, 255, 234, 128 }
    },
    { { 1, 95, 247, 253, 212, 183, 255, 255, 128, 128, 128 },
      { 239, 90, 244, 250, 211, 209, 255, 255, 128, 128, 128 },
      { 155, 77, 195, 248, 188, 195, 255, 255, 128, 128, 128 }
    },
    { { 1, 24, 239, 251, 218, 219, 255, 205, 128, 128, 128 },
      { 201, 51, 219, 255, 196, 186, 128, 128, 128, 128, 128 },
      { 69, 46, 190, 239, 201, 218, 255, 228, 128, 128, 128 }
    },
    { { 1, 191, 251, 255, 255, 128, 128, 128, 128, 128, 128 },
      { 223, 165, 249, 255, 213, 255, 128, 128, 128, 128, 128 },
      { 141, 124, 248, 255, 255, 128, 128, 128, 128, 128, 128 }
    },
    { { 1, 16, 248, 255, 255, 128, 128, 128, 128, 128, 128 },
      { 190, 36, 230, 255, 236, 255, 128, 128, 128, 128, 128 },
      { 149, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 }
    },
    { { 1, 226, 255, 128, 128, 128, 128, 128, 128, 128, 128 },
      { 247, 192, 255, 128, 128, 128, 128, 128, 128, 128, 128 },
      { 240, 128, 255, 128, 128, 128, 128, 128, 128, 128, 128 }
    },
    { { 1, 134, 252, 255, 255, 128, 128, 128, 128, 128, 128 },
      { 213, 62, 250, 255, 255, 128, 128, 128, 128, 128, 128 },
      { 55, 93, 255, 128, 128, 128, 128, 128, 128, 128, 128 }
    },
    { { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 },
      { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 },
      { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 }
    }
  },
  { { { 202, 24, 213, 235, 186, 191, 220, 160, 240, 175, 255 },
      { 126, 38, 182, 232, 169, 184, 228, 174, 255, 187, 128 },
      { 61, 46, 138, 219, 151, 178, 240, 170, 255, 216, 128 }
    },
    { { 1, 112, 230, 250, 199, 191, 247, 159, 255, 255, 128 },
      { 166, 109, 228, 252, 211, 215, 255, 174, 128, 128, 128 },
      { 39, 77, 162, 232, 172, 180, 245, 178, 255, 255, 128 }
    },
    { { 1, 52, 220, 246, 198, 199, 249, 220, 255, 255, 128 },
      { 124, 74, 191, 243, 183, 193, 250, 221, 255, 255, 128 },
      { 24, 71, 130, 219, 154, 170, 243, 182, 255, 255, 128 }
    },
    { { 1, 182, 225, 249, 219, 240, 255, 224, 128, 128, 128 },
      { 149, 150, 226, 252, 216, 205, 255, 171, 128, 128, 128 },
      { 28, 108, 170, 242, 183, 194, 254, 223, 255, 255, 128 }
    },
    { { 1, 81, 230, 252, 204, 203, 255, 192, 128, 128, 128 },
      { 123, 102, 209, 247, 188, 196, 255, 233, 128, 128, 128 },
      { 20, 95, 153, 243, 164, 173, 255, 203, 128, 128, 128 }
    },
    { { 1, 222, 248, 255, 216, 213, 128, 128, 128, 128, 128 },
      { 168, 175, 246, 252, 235, 205, 255, 255, 128, 128, 128 },
      { 47, 116, 215, 255, 211, 212, 255, 255, 128, 128, 128 }
    },
    { { 1, 121, 236, 253, 212, 214, 255, 255, 128, 128, 128 },
      { 141, 84, 213, 252, 201, 202, 255, 219, 128, 128, 128 },
      { 42, 80, 160, 240, 162, 185, 255, 205, 128, 128, 128 }
    },
    { { 1, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 },
      { 244, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 },
      { 238, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 }
    }
  }
};

// Paragraph 11.5
static const uint8_t kBModesProba[NUM_BMODES][NUM_BMODES][NUM_BMODES - 1] = {
  { { 231, 120, 48, 89, 115, 113, 120, 152, 112 },
    { 152, 179, 64, 126, 170, 118, 46, 70, 95 },
    { 175, 69, 143, 80, 85, 82, 72, 155, 103 },
    { 56, 58, 10, 171, 218, 189, 17, 13, 152 },
    { 114, 26, 17, 163, 44, 195, 21, 10, 173 },
    { 121, 24, 80, 195, 26, 62, 44, 64, 85 },
    { 144, 71, 10, 38, 171, 213, 144, 34, 26 },
    { 170, 46, 55, 19, 136, 160, 33, 206, 71 },
    { 63, 20, 8, 114, 114, 208, 12, 9, 226 },
    { 81, 40, 11, 96, 182, 84, 29, 16, 36 } },
  { { 134, 183, 89, 137, 98, 101, 106, 165, 148 },
    { 72, 187, 100, 130, 157, 111, 32, 75, 80 },
    { 66, 102, 167, 99, 74, 62, 40, 234, 128 },
    { 41, 53, 9, 178, 241, 141, 26, 8, 107 },
    { 74, 43, 26, 146, 73, 166, 49, 23, 157 },
    { 65, 38, 105, 160, 51, 52, 31, 115, 128 },
    { 104, 79, 12, 27, 217, 255, 87, 17, 7 },
    { 87, 68, 71, 44, 114, 51, 15, 186, 23 },
    { 47, 41, 14, 110, 182, 183, 21, 17, 194 },
    { 66, 45, 25, 102, 197, 189, 23, 18, 22 } },
  { { 88, 88, 147, 150, 42, 46, 45, 196, 205 },
    { 43, 97, 183, 117, 85, 38, 35, 179, 61 },
    { 39, 53, 200, 87, 26, 21, 43, 232, 171 },
    { 56, 34, 51, 104, 114, 102, 29, 93, 77 },
    { 39, 28, 85, 171, 58, 165, 90, 98, 64 },
    { 34, 22, 116, 206, 23, 34, 43, 166, 73 },
    { 107, 54, 32, 26, 51, 1, 81, 43, 31 },
    { 68, 25, 106, 22, 64, 171, 36, 225, 114 },
    { 34, 19, 21, 102, 132, 188, 16, 76, 124 },
    { 62, 18, 78, 95, 85, 57, 50, 48, 51 } },
  { { 193, 101, 35, 159, 215, 111, 89, 46, 111 },
    { 60, 148, 31, 172, 219, 228, 21, 18, 111 },
    { 112, 113, 77, 85, 179, 255, 38, 120, 114 },
    { 40, 42, 1, 196, 245, 209, 10, 25, 109 },
    { 88, 43, 29, 140, 166, 213, 37, 43, 154 },
    { 61, 63, 30, 155, 67, 45, 68, 1, 209 },
    { 100, 80, 8, 43, 154, 1, 51, 26, 71 },
    { 142, 78, 78, 16, 255, 128, 34, 197, 171 },
    { 41, 40, 5, 102, 211, 183, 4, 1, 221 },
    { 51, 50, 17, 168, 209, 192, 23, 25, 82 } },
  { { 138, 31, 36, 171, 27, 166, 38, 44, 229 },
    { 67, 87, 58, 169, 82, 115, 26, 59, 179 },
    { 63, 59, 90, 180, 59, 166, 93, 73, 154 },
    { 40, 40, 21, 116, 143, 209, 34, 39, 175 },
    { 47, 15, 16, 183, 34, 223, 49, 45, 183 },
    { 46, 17, 33, 183, 6, 98, 15, 32, 183 },
    { 57, 46, 22, 24, 128, 1, 54, 17, 37 },
    { 65, 32, 73, 115, 28, 128, 23, 128, 205 },
    { 40, 3, 9, 115, 51, 192, 18, 6, 223 },
    { 87, 37, 9, 115, 59, 77, 64, 21, 47 } },
  { { 104, 55, 44, 218, 9, 54, 53, 130, 226 },
    { 64, 90, 70, 205, 40, 41, 23, 26, 57 },
    { 54, 57, 112, 184, 5, 41, 38, 166, 213 },
    { 30, 34, 26, 133, 152, 116, 10, 32, 134 },
    { 39, 19, 53, 221, 26, 114, 32, 73, 255 },
    { 31, 9, 65, 234, 2, 15, 1, 118, 73 },
    { 75, 32, 12, 51, 192, 255, 160, 43, 51 },
    { 88, 31, 35, 67, 102, 85, 55, 186, 85 },
    { 56, 21, 23, 111, 59, 205, 45, 37, 192 },
    { 55, 38, 70, 124, 73, 102, 1, 34, 98 } },
  { { 125, 98, 42, 88, 104, 85, 117, 175, 82 },
    { 95, 84, 53, 89, 128, 100, 113, 101, 45 },
    { 75, 79, 123, 47, 51, 128, 81, 171, 1 },
    { 57, 17, 5, 71, 102, 57, 53, 41, 49 },
    { 38, 33, 13, 121, 57, 73, 26, 1, 85 },
    { 41, 10, 67, 138, 77, 110, 90, 47, 114 },
    { 115, 21, 2, 10, 102, 255, 166, 23, 6 },
    { 101, 29, 16, 10, 85, 128, 101, 196, 26 },
    { 57, 18, 10, 102, 102, 213, 34, 20, 43 },
    { 117, 20, 15, 36, 163, 128, 68, 1, 26 } },
  { { 102, 61, 71, 37, 34, 53, 31, 243, 192 },
    { 69, 60, 71, 38, 73, 119, 28, 222, 37 },
    { 68, 45, 128, 34, 1, 47, 11, 245, 171 },
    { 62, 17, 19, 70, 146, 85, 55, 62, 70 },
    { 37, 43, 37, 154, 100, 163, 85, 160, 1 },
    { 63, 9, 92, 136, 28, 64, 32, 201, 85 },
    { 75, 15, 9, 9, 64, 255, 184, 119, 16 },
    { 86, 6, 28, 5, 64, 255, 25, 248, 1 },
    { 56, 8, 17, 132, 137, 255, 55, 116, 128 },
    { 58, 15, 20, 82, 135, 57, 26, 121, 40 } },
  { { 164, 50, 31, 137, 154, 133, 25, 35, 218 },
    { 51, 103, 44, 131, 131, 123, 31, 6, 158 },
    { 86, 40, 64, 135, 148, 224, 45, 183, 128 },
    { 22, 26, 17, 131, 240, 154, 14, 1, 209 },
    { 45, 16, 21, 91, 64, 222, 7, 1, 197 },
    { 56, 21, 39, 155, 60, 138, 23, 102, 213 },
    { 83, 12, 13, 54, 192, 255, 68, 47, 28 },
    { 85, 26, 85, 85, 128, 128, 32, 146, 171 },
    { 18, 11, 7, 63, 144, 171, 4, 4, 246 },
    { 35, 27, 10, 146, 174, 171, 12, 26, 128 } },
  { { 190, 80, 35, 99, 180, 80, 126, 54, 45 },
    { 85, 126, 47, 87, 176, 51, 41, 20, 32 },
    { 101, 75, 128, 139, 118, 146, 116, 128, 85 },
    { 56, 41, 15, 176, 236, 85, 37, 9, 62 },
    { 71, 30, 17, 119, 118, 255, 17, 18, 138 },
    { 101, 38, 60, 138, 55, 70, 43, 26, 142 },
    { 146, 36, 19, 30, 171, 255, 97, 27, 20 },
    { 138, 45, 61, 62, 219, 1, 81, 188, 64 },
    { 32, 41, 20, 117, 151, 142, 20, 21, 163 },
    { 112, 19, 12, 61, 195, 128, 48, 4, 24 } }
};

void VP8ResetProba(VP8Proba* const proba) {
  memset(proba->segments_, 255u, sizeof(proba->segments_));
  memcpy(proba->coeffs_, CoeffsProba0, sizeof(CoeffsProba0));
#ifndef ONLY_KEYFRAME_CODE
  memcpy(proba->mv_, kMVProba0, sizeof(kMVProba0));
  memcpy(proba->ymode_, kYModeProbaInter0, sizeof(kYModeProbaInter0));
  memcpy(proba->uvmode_, kUVModeProbaInter0, sizeof(kUVModeProbaInter0));
#endif
}

void VP8ParseIntraMode(VP8BitReader* const br,  VP8Decoder* const dec) {
  uint8_t* const top = dec->intra_t_ + 4 * dec->mb_x_;
  uint8_t* const left = dec->intra_l_;
  // Hardcoded 16x16 intra-mode decision tree.
  dec->is_i4x4_ = !VP8GetBit(br, 145);   // decide for B_PRED first
  if (!dec->is_i4x4_) {
    const int ymode =
        VP8GetBit(br, 156) ? (VP8GetBit(br, 128) ? TM_PRED : H_PRED)
                           : (VP8GetBit(br, 163) ? V_PRED : DC_PRED);
    dec->imodes_[0] = ymode;
    memset(top, ymode, 4 * sizeof(top[0]));
    memset(left, ymode, 4 * sizeof(left[0]));
  } else {
    uint8_t* modes = dec->imodes_;
    int y;
    for (y = 0; y < 4; ++y) {
      int ymode = left[y];
      int x;
      for (x = 0; x < 4; ++x) {
        const uint8_t* const prob = kBModesProba[top[x]][ymode];
#ifdef USE_GENERIC_TREE
        // Generic tree-parsing
        int i = 0;
        do {
          i = kYModesIntra4[2 * i + VP8GetBit(br, prob[i])];
        } while (i > 0);
        ymode = -i;
#else
        // Hardcoded tree parsing
        ymode = !VP8GetBit(br, prob[0]) ? B_DC_PRED :
                  !VP8GetBit(br, prob[1]) ? B_TM_PRED :
                    !VP8GetBit(br, prob[2]) ? B_VE_PRED :
                      !VP8GetBit(br, prob[3]) ?
                        (!VP8GetBit(br, prob[4]) ? B_HE_PRED :
                          (!VP8GetBit(br, prob[5]) ? B_RD_PRED : B_VR_PRED)) :
                        (!VP8GetBit(br, prob[6]) ? B_LD_PRED :
                          (!VP8GetBit(br, prob[7]) ? B_VL_PRED :
                            (!VP8GetBit(br, prob[8]) ? B_HD_PRED : B_HU_PRED)));
#endif    // USE_GENERIC_TREE
        top[x] = ymode;
        *modes++ = ymode;
      }
      left[y] = ymode;
    }
  }
  // Hardcoded UVMode decision tree
  dec->uvmode_ = !VP8GetBit(br, 142) ? DC_PRED
               : !VP8GetBit(br, 114) ? V_PRED
               : VP8GetBit(br, 183) ? TM_PRED : H_PRED;
}

//-----------------------------------------------------------------------------
// Paragraph 13

static const uint8_t
    CoeffsUpdateProba[NUM_TYPES][NUM_BANDS][NUM_CTX][NUM_PROBAS] = {
  { { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    },
    { { 176, 246, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 223, 241, 252, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 249, 253, 253, 255, 255, 255, 255, 255, 255, 255, 255 }
    },
    { { 255, 244, 252, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 234, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 253, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    },
    { { 255, 246, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 239, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 254, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255 }
    },
    { { 255, 248, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 251, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    },
    { { 255, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 251, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 254, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255 }
    },
    { { 255, 254, 253, 255, 254, 255, 255, 255, 255, 255, 255 },
      { 250, 255, 254, 255, 254, 255, 255, 255, 255, 255, 255 },
      { 254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    },
    { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    }
  },
  { { { 217, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 225, 252, 241, 253, 255, 255, 254, 255, 255, 255, 255 },
      { 234, 250, 241, 250, 253, 255, 253, 254, 255, 255, 255 }
    },
    { { 255, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 223, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 238, 253, 254, 254, 255, 255, 255, 255, 255, 255, 255 }
    },
    { { 255, 248, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 249, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    },
    { { 255, 253, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 247, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    },
    { { 255, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 252, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    },
    { { 255, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 253, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    },
    { { 255, 254, 253, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 250, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    },
    { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    }
  },
  { { { 186, 251, 250, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 234, 251, 244, 254, 255, 255, 255, 255, 255, 255, 255 },
      { 251, 251, 243, 253, 254, 255, 254, 255, 255, 255, 255 }
    },
    { { 255, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 236, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 251, 253, 253, 254, 254, 255, 255, 255, 255, 255, 255 }
    },
    { { 255, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 254, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    },
    { { 255, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 254, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    },
    { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    },
    { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    },
    { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    },
    { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    }
  },
  { { { 248, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 250, 254, 252, 254, 255, 255, 255, 255, 255, 255, 255 },
      { 248, 254, 249, 253, 255, 255, 255, 255, 255, 255, 255 }
    },
    { { 255, 253, 253, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 246, 253, 253, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 252, 254, 251, 254, 254, 255, 255, 255, 255, 255, 255 }
    },
    { { 255, 254, 252, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 248, 254, 253, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 253, 255, 254, 254, 255, 255, 255, 255, 255, 255, 255 }
    },
    { { 255, 251, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 245, 251, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 253, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 }
    },
    { { 255, 251, 253, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 252, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 255, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    },
    { { 255, 252, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 249, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 255, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255 }
    },
    { { 255, 255, 253, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 250, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    },
    { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    }
  }
};

#ifndef ONLY_KEYFRAME_CODE
static const uint8_t MVUpdateProba[2][NUM_MV_PROBAS] = {
  { 237, 246, 253, 253, 254, 254, 254, 254,
    254, 254, 254, 254, 254, 254, 250, 250,
    252, 254, 254 },
  { 231, 243, 245, 253, 254, 254, 254, 254,
    254, 254, 254, 254, 254, 254, 251, 251,
    254, 254, 254 }
};
#endif

// Paragraph 9.9
void VP8ParseProba(VP8BitReader* const br, VP8Decoder* const dec) {
  VP8Proba* const proba = &dec->proba_;
  int t, b, c, p;
  for (t = 0; t < NUM_TYPES; ++t) {
    for (b = 0; b < NUM_BANDS; ++b) {
      for (c = 0; c < NUM_CTX; ++c) {
        for (p = 0; p < NUM_PROBAS; ++p) {
          if (VP8GetBit(br, CoeffsUpdateProba[t][b][c][p])) {
            proba->coeffs_[t][b][c][p] = VP8GetValue(br, 8);
          }
        }
      }
    }
  }
  dec->use_skip_proba_ = VP8Get(br);
  if (dec->use_skip_proba_) {
    dec->skip_p_ = VP8GetValue(br, 8);
  }
#ifndef ONLY_KEYFRAME_CODE
  if (!dec->frm_hdr_.key_frame_) {
    int i;
    dec->intra_p_ = VP8GetValue(br, 8);
    dec->last_p_ = VP8GetValue(br, 8);
    dec->golden_p_ = VP8GetValue(br, 8);
    if (VP8Get(br)) {   // update y-mode
      for (i = 0; i < 4; ++i) {
        proba->ymode_[i] = VP8GetValue(br, 8);
      }
    }
    if (VP8Get(br)) {   // update uv-mode
      for (i = 0; i < 3; ++i) {
        proba->uvmode_[i] = VP8GetValue(br, 8);
      }
    }
    // update MV
    for (i = 0; i < 2; ++i) {
      int k;
      for (k = 0; k < NUM_MV_PROBAS; ++k) {
        if (VP8GetBit(br, MVUpdateProba[i][k])) {
          const int v = VP8GetValue(br, 7);
          proba->mv_[i][k] = v ? v << 1 : 1;
        }
      }
    }
  }
#endif
}

#if defined(__cplusplus) || defined(c_plusplus)
}    // extern "C"
#endif