github.com/cellofellow/gopkg@v0.0.0-20140722061823-eec0544a62ad/image/webp/libwebp/src/dec/tree.c (about)

     1  // Copyright 2010 Google Inc. All Rights Reserved.
     2  //
     3  // Use of this source code is governed by a BSD-style license
     4  // that can be found in the COPYING file in the root of the source
     5  // tree. An additional intellectual property rights grant can be found
     6  // in the file PATENTS. All contributing project authors may
     7  // be found in the AUTHORS file in the root of the source tree.
     8  // -----------------------------------------------------------------------------
     9  //
    10  // Coding trees and probas
    11  //
    12  // Author: Skal (pascal.massimino@gmail.com)
    13  
    14  #include "vp8i.h"
    15  
    16  #define USE_GENERIC_TREE
    17  
    18  #ifdef USE_GENERIC_TREE
    19  static const int8_t kYModesIntra4[18] = {
    20    -B_DC_PRED, 1,
    21      -B_TM_PRED, 2,
    22        -B_VE_PRED, 3,
    23          4, 6,
    24            -B_HE_PRED, 5,
    25              -B_RD_PRED, -B_VR_PRED,
    26          -B_LD_PRED, 7,
    27            -B_VL_PRED, 8,
    28              -B_HD_PRED, -B_HU_PRED
    29  };
    30  #endif
    31  
    32  //------------------------------------------------------------------------------
    33  // Default probabilities
    34  
    35  // Paragraph 13.5
    36  static const uint8_t
    37    CoeffsProba0[NUM_TYPES][NUM_BANDS][NUM_CTX][NUM_PROBAS] = {
    38    { { { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 },
    39        { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 },
    40        { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 }
    41      },
    42      { { 253, 136, 254, 255, 228, 219, 128, 128, 128, 128, 128 },
    43        { 189, 129, 242, 255, 227, 213, 255, 219, 128, 128, 128 },
    44        { 106, 126, 227, 252, 214, 209, 255, 255, 128, 128, 128 }
    45      },
    46      { { 1, 98, 248, 255, 236, 226, 255, 255, 128, 128, 128 },
    47        { 181, 133, 238, 254, 221, 234, 255, 154, 128, 128, 128 },
    48        { 78, 134, 202, 247, 198, 180, 255, 219, 128, 128, 128 },
    49      },
    50      { { 1, 185, 249, 255, 243, 255, 128, 128, 128, 128, 128 },
    51        { 184, 150, 247, 255, 236, 224, 128, 128, 128, 128, 128 },
    52        { 77, 110, 216, 255, 236, 230, 128, 128, 128, 128, 128 },
    53      },
    54      { { 1, 101, 251, 255, 241, 255, 128, 128, 128, 128, 128 },
    55        { 170, 139, 241, 252, 236, 209, 255, 255, 128, 128, 128 },
    56        { 37, 116, 196, 243, 228, 255, 255, 255, 128, 128, 128 }
    57      },
    58      { { 1, 204, 254, 255, 245, 255, 128, 128, 128, 128, 128 },
    59        { 207, 160, 250, 255, 238, 128, 128, 128, 128, 128, 128 },
    60        { 102, 103, 231, 255, 211, 171, 128, 128, 128, 128, 128 }
    61      },
    62      { { 1, 152, 252, 255, 240, 255, 128, 128, 128, 128, 128 },
    63        { 177, 135, 243, 255, 234, 225, 128, 128, 128, 128, 128 },
    64        { 80, 129, 211, 255, 194, 224, 128, 128, 128, 128, 128 }
    65      },
    66      { { 1, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 },
    67        { 246, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 },
    68        { 255, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 }
    69      }
    70    },
    71    { { { 198, 35, 237, 223, 193, 187, 162, 160, 145, 155, 62 },
    72        { 131, 45, 198, 221, 172, 176, 220, 157, 252, 221, 1 },
    73        { 68, 47, 146, 208, 149, 167, 221, 162, 255, 223, 128 }
    74      },
    75      { { 1, 149, 241, 255, 221, 224, 255, 255, 128, 128, 128 },
    76        { 184, 141, 234, 253, 222, 220, 255, 199, 128, 128, 128 },
    77        { 81, 99, 181, 242, 176, 190, 249, 202, 255, 255, 128 }
    78      },
    79      { { 1, 129, 232, 253, 214, 197, 242, 196, 255, 255, 128 },
    80        { 99, 121, 210, 250, 201, 198, 255, 202, 128, 128, 128 },
    81        { 23, 91, 163, 242, 170, 187, 247, 210, 255, 255, 128 }
    82      },
    83      { { 1, 200, 246, 255, 234, 255, 128, 128, 128, 128, 128 },
    84        { 109, 178, 241, 255, 231, 245, 255, 255, 128, 128, 128 },
    85        { 44, 130, 201, 253, 205, 192, 255, 255, 128, 128, 128 }
    86      },
    87      { { 1, 132, 239, 251, 219, 209, 255, 165, 128, 128, 128 },
    88        { 94, 136, 225, 251, 218, 190, 255, 255, 128, 128, 128 },
    89        { 22, 100, 174, 245, 186, 161, 255, 199, 128, 128, 128 }
    90      },
    91      { { 1, 182, 249, 255, 232, 235, 128, 128, 128, 128, 128 },
    92        { 124, 143, 241, 255, 227, 234, 128, 128, 128, 128, 128 },
    93        { 35, 77, 181, 251, 193, 211, 255, 205, 128, 128, 128 }
    94      },
    95      { { 1, 157, 247, 255, 236, 231, 255, 255, 128, 128, 128 },
    96        { 121, 141, 235, 255, 225, 227, 255, 255, 128, 128, 128 },
    97        { 45, 99, 188, 251, 195, 217, 255, 224, 128, 128, 128 }
    98      },
    99      { { 1, 1, 251, 255, 213, 255, 128, 128, 128, 128, 128 },
   100        { 203, 1, 248, 255, 255, 128, 128, 128, 128, 128, 128 },
   101        { 137, 1, 177, 255, 224, 255, 128, 128, 128, 128, 128 }
   102      }
   103    },
   104    { { { 253, 9, 248, 251, 207, 208, 255, 192, 128, 128, 128 },
   105        { 175, 13, 224, 243, 193, 185, 249, 198, 255, 255, 128 },
   106        { 73, 17, 171, 221, 161, 179, 236, 167, 255, 234, 128 }
   107      },
   108      { { 1, 95, 247, 253, 212, 183, 255, 255, 128, 128, 128 },
   109        { 239, 90, 244, 250, 211, 209, 255, 255, 128, 128, 128 },
   110        { 155, 77, 195, 248, 188, 195, 255, 255, 128, 128, 128 }
   111      },
   112      { { 1, 24, 239, 251, 218, 219, 255, 205, 128, 128, 128 },
   113        { 201, 51, 219, 255, 196, 186, 128, 128, 128, 128, 128 },
   114        { 69, 46, 190, 239, 201, 218, 255, 228, 128, 128, 128 }
   115      },
   116      { { 1, 191, 251, 255, 255, 128, 128, 128, 128, 128, 128 },
   117        { 223, 165, 249, 255, 213, 255, 128, 128, 128, 128, 128 },
   118        { 141, 124, 248, 255, 255, 128, 128, 128, 128, 128, 128 }
   119      },
   120      { { 1, 16, 248, 255, 255, 128, 128, 128, 128, 128, 128 },
   121        { 190, 36, 230, 255, 236, 255, 128, 128, 128, 128, 128 },
   122        { 149, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 }
   123      },
   124      { { 1, 226, 255, 128, 128, 128, 128, 128, 128, 128, 128 },
   125        { 247, 192, 255, 128, 128, 128, 128, 128, 128, 128, 128 },
   126        { 240, 128, 255, 128, 128, 128, 128, 128, 128, 128, 128 }
   127      },
   128      { { 1, 134, 252, 255, 255, 128, 128, 128, 128, 128, 128 },
   129        { 213, 62, 250, 255, 255, 128, 128, 128, 128, 128, 128 },
   130        { 55, 93, 255, 128, 128, 128, 128, 128, 128, 128, 128 }
   131      },
   132      { { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 },
   133        { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 },
   134        { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 }
   135      }
   136    },
   137    { { { 202, 24, 213, 235, 186, 191, 220, 160, 240, 175, 255 },
   138        { 126, 38, 182, 232, 169, 184, 228, 174, 255, 187, 128 },
   139        { 61, 46, 138, 219, 151, 178, 240, 170, 255, 216, 128 }
   140      },
   141      { { 1, 112, 230, 250, 199, 191, 247, 159, 255, 255, 128 },
   142        { 166, 109, 228, 252, 211, 215, 255, 174, 128, 128, 128 },
   143        { 39, 77, 162, 232, 172, 180, 245, 178, 255, 255, 128 }
   144      },
   145      { { 1, 52, 220, 246, 198, 199, 249, 220, 255, 255, 128 },
   146        { 124, 74, 191, 243, 183, 193, 250, 221, 255, 255, 128 },
   147        { 24, 71, 130, 219, 154, 170, 243, 182, 255, 255, 128 }
   148      },
   149      { { 1, 182, 225, 249, 219, 240, 255, 224, 128, 128, 128 },
   150        { 149, 150, 226, 252, 216, 205, 255, 171, 128, 128, 128 },
   151        { 28, 108, 170, 242, 183, 194, 254, 223, 255, 255, 128 }
   152      },
   153      { { 1, 81, 230, 252, 204, 203, 255, 192, 128, 128, 128 },
   154        { 123, 102, 209, 247, 188, 196, 255, 233, 128, 128, 128 },
   155        { 20, 95, 153, 243, 164, 173, 255, 203, 128, 128, 128 }
   156      },
   157      { { 1, 222, 248, 255, 216, 213, 128, 128, 128, 128, 128 },
   158        { 168, 175, 246, 252, 235, 205, 255, 255, 128, 128, 128 },
   159        { 47, 116, 215, 255, 211, 212, 255, 255, 128, 128, 128 }
   160      },
   161      { { 1, 121, 236, 253, 212, 214, 255, 255, 128, 128, 128 },
   162        { 141, 84, 213, 252, 201, 202, 255, 219, 128, 128, 128 },
   163        { 42, 80, 160, 240, 162, 185, 255, 205, 128, 128, 128 }
   164      },
   165      { { 1, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 },
   166        { 244, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 },
   167        { 238, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 }
   168      }
   169    }
   170  };
   171  
   172  // Paragraph 11.5
   173  static const uint8_t kBModesProba[NUM_BMODES][NUM_BMODES][NUM_BMODES - 1] = {
   174    { { 231, 120, 48, 89, 115, 113, 120, 152, 112 },
   175      { 152, 179, 64, 126, 170, 118, 46, 70, 95 },
   176      { 175, 69, 143, 80, 85, 82, 72, 155, 103 },
   177      { 56, 58, 10, 171, 218, 189, 17, 13, 152 },
   178      { 114, 26, 17, 163, 44, 195, 21, 10, 173 },
   179      { 121, 24, 80, 195, 26, 62, 44, 64, 85 },
   180      { 144, 71, 10, 38, 171, 213, 144, 34, 26 },
   181      { 170, 46, 55, 19, 136, 160, 33, 206, 71 },
   182      { 63, 20, 8, 114, 114, 208, 12, 9, 226 },
   183      { 81, 40, 11, 96, 182, 84, 29, 16, 36 } },
   184    { { 134, 183, 89, 137, 98, 101, 106, 165, 148 },
   185      { 72, 187, 100, 130, 157, 111, 32, 75, 80 },
   186      { 66, 102, 167, 99, 74, 62, 40, 234, 128 },
   187      { 41, 53, 9, 178, 241, 141, 26, 8, 107 },
   188      { 74, 43, 26, 146, 73, 166, 49, 23, 157 },
   189      { 65, 38, 105, 160, 51, 52, 31, 115, 128 },
   190      { 104, 79, 12, 27, 217, 255, 87, 17, 7 },
   191      { 87, 68, 71, 44, 114, 51, 15, 186, 23 },
   192      { 47, 41, 14, 110, 182, 183, 21, 17, 194 },
   193      { 66, 45, 25, 102, 197, 189, 23, 18, 22 } },
   194    { { 88, 88, 147, 150, 42, 46, 45, 196, 205 },
   195      { 43, 97, 183, 117, 85, 38, 35, 179, 61 },
   196      { 39, 53, 200, 87, 26, 21, 43, 232, 171 },
   197      { 56, 34, 51, 104, 114, 102, 29, 93, 77 },
   198      { 39, 28, 85, 171, 58, 165, 90, 98, 64 },
   199      { 34, 22, 116, 206, 23, 34, 43, 166, 73 },
   200      { 107, 54, 32, 26, 51, 1, 81, 43, 31 },
   201      { 68, 25, 106, 22, 64, 171, 36, 225, 114 },
   202      { 34, 19, 21, 102, 132, 188, 16, 76, 124 },
   203      { 62, 18, 78, 95, 85, 57, 50, 48, 51 } },
   204    { { 193, 101, 35, 159, 215, 111, 89, 46, 111 },
   205      { 60, 148, 31, 172, 219, 228, 21, 18, 111 },
   206      { 112, 113, 77, 85, 179, 255, 38, 120, 114 },
   207      { 40, 42, 1, 196, 245, 209, 10, 25, 109 },
   208      { 88, 43, 29, 140, 166, 213, 37, 43, 154 },
   209      { 61, 63, 30, 155, 67, 45, 68, 1, 209 },
   210      { 100, 80, 8, 43, 154, 1, 51, 26, 71 },
   211      { 142, 78, 78, 16, 255, 128, 34, 197, 171 },
   212      { 41, 40, 5, 102, 211, 183, 4, 1, 221 },
   213      { 51, 50, 17, 168, 209, 192, 23, 25, 82 } },
   214    { { 138, 31, 36, 171, 27, 166, 38, 44, 229 },
   215      { 67, 87, 58, 169, 82, 115, 26, 59, 179 },
   216      { 63, 59, 90, 180, 59, 166, 93, 73, 154 },
   217      { 40, 40, 21, 116, 143, 209, 34, 39, 175 },
   218      { 47, 15, 16, 183, 34, 223, 49, 45, 183 },
   219      { 46, 17, 33, 183, 6, 98, 15, 32, 183 },
   220      { 57, 46, 22, 24, 128, 1, 54, 17, 37 },
   221      { 65, 32, 73, 115, 28, 128, 23, 128, 205 },
   222      { 40, 3, 9, 115, 51, 192, 18, 6, 223 },
   223      { 87, 37, 9, 115, 59, 77, 64, 21, 47 } },
   224    { { 104, 55, 44, 218, 9, 54, 53, 130, 226 },
   225      { 64, 90, 70, 205, 40, 41, 23, 26, 57 },
   226      { 54, 57, 112, 184, 5, 41, 38, 166, 213 },
   227      { 30, 34, 26, 133, 152, 116, 10, 32, 134 },
   228      { 39, 19, 53, 221, 26, 114, 32, 73, 255 },
   229      { 31, 9, 65, 234, 2, 15, 1, 118, 73 },
   230      { 75, 32, 12, 51, 192, 255, 160, 43, 51 },
   231      { 88, 31, 35, 67, 102, 85, 55, 186, 85 },
   232      { 56, 21, 23, 111, 59, 205, 45, 37, 192 },
   233      { 55, 38, 70, 124, 73, 102, 1, 34, 98 } },
   234    { { 125, 98, 42, 88, 104, 85, 117, 175, 82 },
   235      { 95, 84, 53, 89, 128, 100, 113, 101, 45 },
   236      { 75, 79, 123, 47, 51, 128, 81, 171, 1 },
   237      { 57, 17, 5, 71, 102, 57, 53, 41, 49 },
   238      { 38, 33, 13, 121, 57, 73, 26, 1, 85 },
   239      { 41, 10, 67, 138, 77, 110, 90, 47, 114 },
   240      { 115, 21, 2, 10, 102, 255, 166, 23, 6 },
   241      { 101, 29, 16, 10, 85, 128, 101, 196, 26 },
   242      { 57, 18, 10, 102, 102, 213, 34, 20, 43 },
   243      { 117, 20, 15, 36, 163, 128, 68, 1, 26 } },
   244    { { 102, 61, 71, 37, 34, 53, 31, 243, 192 },
   245      { 69, 60, 71, 38, 73, 119, 28, 222, 37 },
   246      { 68, 45, 128, 34, 1, 47, 11, 245, 171 },
   247      { 62, 17, 19, 70, 146, 85, 55, 62, 70 },
   248      { 37, 43, 37, 154, 100, 163, 85, 160, 1 },
   249      { 63, 9, 92, 136, 28, 64, 32, 201, 85 },
   250      { 75, 15, 9, 9, 64, 255, 184, 119, 16 },
   251      { 86, 6, 28, 5, 64, 255, 25, 248, 1 },
   252      { 56, 8, 17, 132, 137, 255, 55, 116, 128 },
   253      { 58, 15, 20, 82, 135, 57, 26, 121, 40 } },
   254    { { 164, 50, 31, 137, 154, 133, 25, 35, 218 },
   255      { 51, 103, 44, 131, 131, 123, 31, 6, 158 },
   256      { 86, 40, 64, 135, 148, 224, 45, 183, 128 },
   257      { 22, 26, 17, 131, 240, 154, 14, 1, 209 },
   258      { 45, 16, 21, 91, 64, 222, 7, 1, 197 },
   259      { 56, 21, 39, 155, 60, 138, 23, 102, 213 },
   260      { 83, 12, 13, 54, 192, 255, 68, 47, 28 },
   261      { 85, 26, 85, 85, 128, 128, 32, 146, 171 },
   262      { 18, 11, 7, 63, 144, 171, 4, 4, 246 },
   263      { 35, 27, 10, 146, 174, 171, 12, 26, 128 } },
   264    { { 190, 80, 35, 99, 180, 80, 126, 54, 45 },
   265      { 85, 126, 47, 87, 176, 51, 41, 20, 32 },
   266      { 101, 75, 128, 139, 118, 146, 116, 128, 85 },
   267      { 56, 41, 15, 176, 236, 85, 37, 9, 62 },
   268      { 71, 30, 17, 119, 118, 255, 17, 18, 138 },
   269      { 101, 38, 60, 138, 55, 70, 43, 26, 142 },
   270      { 146, 36, 19, 30, 171, 255, 97, 27, 20 },
   271      { 138, 45, 61, 62, 219, 1, 81, 188, 64 },
   272      { 32, 41, 20, 117, 151, 142, 20, 21, 163 },
   273      { 112, 19, 12, 61, 195, 128, 48, 4, 24 } }
   274  };
   275  
   276  void VP8ResetProba(VP8Proba* const proba) {
   277    memset(proba->segments_, 255u, sizeof(proba->segments_));
   278    // proba->bands_[][] is initialized later
   279  }
   280  
   281  void VP8ParseIntraMode(VP8BitReader* const br, VP8Decoder* const dec) {
   282    uint8_t* const top = dec->intra_t_ + 4 * dec->mb_x_;
   283    uint8_t* const left = dec->intra_l_;
   284    VP8MBData* const block = dec->mb_data_ + dec->mb_x_;
   285  
   286    block->is_i4x4_ = !VP8GetBit(br, 145);   // decide for B_PRED first
   287    if (!block->is_i4x4_) {
   288      // Hardcoded 16x16 intra-mode decision tree.
   289      const int ymode =
   290          VP8GetBit(br, 156) ? (VP8GetBit(br, 128) ? TM_PRED : H_PRED)
   291                             : (VP8GetBit(br, 163) ? V_PRED : DC_PRED);
   292      block->imodes_[0] = ymode;
   293      memset(top, ymode, 4 * sizeof(*top));
   294      memset(left, ymode, 4 * sizeof(*left));
   295    } else {
   296      uint8_t* modes = block->imodes_;
   297      int y;
   298      for (y = 0; y < 4; ++y) {
   299        int ymode = left[y];
   300        int x;
   301        for (x = 0; x < 4; ++x) {
   302          const uint8_t* const prob = kBModesProba[top[x]][ymode];
   303  #ifdef USE_GENERIC_TREE
   304          // Generic tree-parsing
   305          int i = kYModesIntra4[VP8GetBit(br, prob[0])];
   306          while (i > 0) {
   307            i = kYModesIntra4[2 * i + VP8GetBit(br, prob[i])];
   308          }
   309          ymode = -i;
   310  #else
   311          // Hardcoded tree parsing
   312          ymode = !VP8GetBit(br, prob[0]) ? B_DC_PRED :
   313                    !VP8GetBit(br, prob[1]) ? B_TM_PRED :
   314                      !VP8GetBit(br, prob[2]) ? B_VE_PRED :
   315                        !VP8GetBit(br, prob[3]) ?
   316                          (!VP8GetBit(br, prob[4]) ? B_HE_PRED :
   317                            (!VP8GetBit(br, prob[5]) ? B_RD_PRED : B_VR_PRED)) :
   318                          (!VP8GetBit(br, prob[6]) ? B_LD_PRED :
   319                            (!VP8GetBit(br, prob[7]) ? B_VL_PRED :
   320                              (!VP8GetBit(br, prob[8]) ? B_HD_PRED : B_HU_PRED)));
   321  #endif    // USE_GENERIC_TREE
   322          top[x] = ymode;
   323        }
   324        memcpy(modes, top, 4 * sizeof(*top));
   325        modes += 4;
   326        left[y] = ymode;
   327      }
   328    }
   329    // Hardcoded UVMode decision tree
   330    block->uvmode_ = !VP8GetBit(br, 142) ? DC_PRED
   331                   : !VP8GetBit(br, 114) ? V_PRED
   332                   : VP8GetBit(br, 183) ? TM_PRED : H_PRED;
   333  }
   334  
   335  //------------------------------------------------------------------------------
   336  // Paragraph 13
   337  
   338  static const uint8_t
   339      CoeffsUpdateProba[NUM_TYPES][NUM_BANDS][NUM_CTX][NUM_PROBAS] = {
   340    { { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
   341        { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
   342        { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
   343      },
   344      { { 176, 246, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
   345        { 223, 241, 252, 255, 255, 255, 255, 255, 255, 255, 255 },
   346        { 249, 253, 253, 255, 255, 255, 255, 255, 255, 255, 255 }
   347      },
   348      { { 255, 244, 252, 255, 255, 255, 255, 255, 255, 255, 255 },
   349        { 234, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
   350        { 253, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
   351      },
   352      { { 255, 246, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
   353        { 239, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
   354        { 254, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255 }
   355      },
   356      { { 255, 248, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
   357        { 251, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
   358        { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
   359      },
   360      { { 255, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
   361        { 251, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
   362        { 254, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255 }
   363      },
   364      { { 255, 254, 253, 255, 254, 255, 255, 255, 255, 255, 255 },
   365        { 250, 255, 254, 255, 254, 255, 255, 255, 255, 255, 255 },
   366        { 254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
   367      },
   368      { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
   369        { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
   370        { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
   371      }
   372    },
   373    { { { 217, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
   374        { 225, 252, 241, 253, 255, 255, 254, 255, 255, 255, 255 },
   375        { 234, 250, 241, 250, 253, 255, 253, 254, 255, 255, 255 }
   376      },
   377      { { 255, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
   378        { 223, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
   379        { 238, 253, 254, 254, 255, 255, 255, 255, 255, 255, 255 }
   380      },
   381      { { 255, 248, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
   382        { 249, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
   383        { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
   384      },
   385      { { 255, 253, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
   386        { 247, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
   387        { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
   388      },
   389      { { 255, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
   390        { 252, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
   391        { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
   392      },
   393      { { 255, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
   394        { 253, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
   395        { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
   396      },
   397      { { 255, 254, 253, 255, 255, 255, 255, 255, 255, 255, 255 },
   398        { 250, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
   399        { 254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
   400      },
   401      { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
   402        { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
   403        { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
   404      }
   405    },
   406    { { { 186, 251, 250, 255, 255, 255, 255, 255, 255, 255, 255 },
   407        { 234, 251, 244, 254, 255, 255, 255, 255, 255, 255, 255 },
   408        { 251, 251, 243, 253, 254, 255, 254, 255, 255, 255, 255 }
   409      },
   410      { { 255, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
   411        { 236, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
   412        { 251, 253, 253, 254, 254, 255, 255, 255, 255, 255, 255 }
   413      },
   414      { { 255, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
   415        { 254, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
   416        { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
   417      },
   418      { { 255, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
   419        { 254, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
   420        { 254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
   421      },
   422      { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
   423        { 254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
   424        { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
   425      },
   426      { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
   427        { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
   428        { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
   429      },
   430      { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
   431        { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
   432        { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
   433      },
   434      { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
   435        { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
   436        { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
   437      }
   438    },
   439    { { { 248, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
   440        { 250, 254, 252, 254, 255, 255, 255, 255, 255, 255, 255 },
   441        { 248, 254, 249, 253, 255, 255, 255, 255, 255, 255, 255 }
   442      },
   443      { { 255, 253, 253, 255, 255, 255, 255, 255, 255, 255, 255 },
   444        { 246, 253, 253, 255, 255, 255, 255, 255, 255, 255, 255 },
   445        { 252, 254, 251, 254, 254, 255, 255, 255, 255, 255, 255 }
   446      },
   447      { { 255, 254, 252, 255, 255, 255, 255, 255, 255, 255, 255 },
   448        { 248, 254, 253, 255, 255, 255, 255, 255, 255, 255, 255 },
   449        { 253, 255, 254, 254, 255, 255, 255, 255, 255, 255, 255 }
   450      },
   451      { { 255, 251, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
   452        { 245, 251, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
   453        { 253, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 }
   454      },
   455      { { 255, 251, 253, 255, 255, 255, 255, 255, 255, 255, 255 },
   456        { 252, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
   457        { 255, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
   458      },
   459      { { 255, 252, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
   460        { 249, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
   461        { 255, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255 }
   462      },
   463      { { 255, 255, 253, 255, 255, 255, 255, 255, 255, 255, 255 },
   464        { 250, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
   465        { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
   466      },
   467      { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
   468        { 254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
   469        { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
   470      }
   471    }
   472  };
   473  
   474  // Paragraph 9.9
   475  void VP8ParseProba(VP8BitReader* const br, VP8Decoder* const dec) {
   476    VP8Proba* const proba = &dec->proba_;
   477    int t, b, c, p;
   478    for (t = 0; t < NUM_TYPES; ++t) {
   479      for (b = 0; b < NUM_BANDS; ++b) {
   480        for (c = 0; c < NUM_CTX; ++c) {
   481          for (p = 0; p < NUM_PROBAS; ++p) {
   482            const int v = VP8GetBit(br, CoeffsUpdateProba[t][b][c][p]) ?
   483                          VP8GetValue(br, 8) : CoeffsProba0[t][b][c][p];
   484            proba->bands_[t][b].probas_[c][p] = v;
   485          }
   486        }
   487      }
   488    }
   489    dec->use_skip_proba_ = VP8Get(br);
   490    if (dec->use_skip_proba_) {
   491      dec->skip_p_ = VP8GetValue(br, 8);
   492    }
   493  }
   494