third_party/libwebp/enc/tree.c

   1 // Copyright 2011 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 of token probabilities, intra modes and segments.
  11 //
  12 // Author: Skal (pascal.massimino@gmail.com)
  13
  14 #include "./vp8enci.h"
  15
  16 //------------------------------------------------------------------------------
  17 // Default probabilities
  18
  19 // Paragraph 13.5
  20 const uint8_t
  21   VP8CoeffsProba0[NUM_TYPES][NUM_BANDS][NUM_CTX][NUM_PROBAS] = {
  22   { { { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 },
  23       { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 },
  24       { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 }
  25     },
  26     { { 253, 136, 254, 255, 228, 219, 128, 128, 128, 128, 128 },
  27       { 189, 129, 242, 255, 227, 213, 255, 219, 128, 128, 128 },
  28       { 106, 126, 227, 252, 214, 209, 255, 255, 128, 128, 128 }
  29     },
  30     { { 1, 98, 248, 255, 236, 226, 255, 255, 128, 128, 128 },
  31       { 181, 133, 238, 254, 221, 234, 255, 154, 128, 128, 128 },
  32       { 78, 134, 202, 247, 198, 180, 255, 219, 128, 128, 128 },
  33     },
  34     { { 1, 185, 249, 255, 243, 255, 128, 128, 128, 128, 128 },
  35       { 184, 150, 247, 255, 236, 224, 128, 128, 128, 128, 128 },
  36       { 77, 110, 216, 255, 236, 230, 128, 128, 128, 128, 128 },
  37     },
  38     { { 1, 101, 251, 255, 241, 255, 128, 128, 128, 128, 128 },
  39       { 170, 139, 241, 252, 236, 209, 255, 255, 128, 128, 128 },
  40       { 37, 116, 196, 243, 228, 255, 255, 255, 128, 128, 128 }
  41     },
  42     { { 1, 204, 254, 255, 245, 255, 128, 128, 128, 128, 128 },
  43       { 207, 160, 250, 255, 238, 128, 128, 128, 128, 128, 128 },
  44       { 102, 103, 231, 255, 211, 171, 128, 128, 128, 128, 128 }
  45     },
  46     { { 1, 152, 252, 255, 240, 255, 128, 128, 128, 128, 128 },
  47       { 177, 135, 243, 255, 234, 225, 128, 128, 128, 128, 128 },
  48       { 80, 129, 211, 255, 194, 224, 128, 128, 128, 128, 128 }
  49     },
  50     { { 1, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 },
  51       { 246, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 },
  52       { 255, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 }
  53     }
  54   },
  55   { { { 198, 35, 237, 223, 193, 187, 162, 160, 145, 155, 62 },
  56       { 131, 45, 198, 221, 172, 176, 220, 157, 252, 221, 1 },
  57       { 68, 47, 146, 208, 149, 167, 221, 162, 255, 223, 128 }
  58     },
  59     { { 1, 149, 241, 255, 221, 224, 255, 255, 128, 128, 128 },
  60       { 184, 141, 234, 253, 222, 220, 255, 199, 128, 128, 128 },
  61       { 81, 99, 181, 242, 176, 190, 249, 202, 255, 255, 128 }
  62     },
  63     { { 1, 129, 232, 253, 214, 197, 242, 196, 255, 255, 128 },
  64       { 99, 121, 210, 250, 201, 198, 255, 202, 128, 128, 128 },
  65       { 23, 91, 163, 242, 170, 187, 247, 210, 255, 255, 128 }
  66     },
  67     { { 1, 200, 246, 255, 234, 255, 128, 128, 128, 128, 128 },
  68       { 109, 178, 241, 255, 231, 245, 255, 255, 128, 128, 128 },
  69       { 44, 130, 201, 253, 205, 192, 255, 255, 128, 128, 128 }
  70     },
  71     { { 1, 132, 239, 251, 219, 209, 255, 165, 128, 128, 128 },
  72       { 94, 136, 225, 251, 218, 190, 255, 255, 128, 128, 128 },
  73       { 22, 100, 174, 245, 186, 161, 255, 199, 128, 128, 128 }
  74     },
  75     { { 1, 182, 249, 255, 232, 235, 128, 128, 128, 128, 128 },
  76       { 124, 143, 241, 255, 227, 234, 128, 128, 128, 128, 128 },
  77       { 35, 77, 181, 251, 193, 211, 255, 205, 128, 128, 128 }
  78     },
  79     { { 1, 157, 247, 255, 236, 231, 255, 255, 128, 128, 128 },
  80       { 121, 141, 235, 255, 225, 227, 255, 255, 128, 128, 128 },
  81       { 45, 99, 188, 251, 195, 217, 255, 224, 128, 128, 128 }
  82     },
  83     { { 1, 1, 251, 255, 213, 255, 128, 128, 128, 128, 128 },
  84       { 203, 1, 248, 255, 255, 128, 128, 128, 128, 128, 128 },
  85       { 137, 1, 177, 255, 224, 255, 128, 128, 128, 128, 128 }
  86     }
  87   },
  88   { { { 253, 9, 248, 251, 207, 208, 255, 192, 128, 128, 128 },
  89       { 175, 13, 224, 243, 193, 185, 249, 198, 255, 255, 128 },
  90       { 73, 17, 171, 221, 161, 179, 236, 167, 255, 234, 128 }
  91     },
  92     { { 1, 95, 247, 253, 212, 183, 255, 255, 128, 128, 128 },
  93       { 239, 90, 244, 250, 211, 209, 255, 255, 128, 128, 128 },
  94       { 155, 77, 195, 248, 188, 195, 255, 255, 128, 128, 128 }
  95     },
  96     { { 1, 24, 239, 251, 218, 219, 255, 205, 128, 128, 128 },
  97       { 201, 51, 219, 255, 196, 186, 128, 128, 128, 128, 128 },
  98       { 69, 46, 190, 239, 201, 218, 255, 228, 128, 128, 128 }
  99     },
 100     { { 1, 191, 251, 255, 255, 128, 128, 128, 128, 128, 128 },
 101       { 223, 165, 249, 255, 213, 255, 128, 128, 128, 128, 128 },
 102       { 141, 124, 248, 255, 255, 128, 128, 128, 128, 128, 128 }
 103     },
 104     { { 1, 16, 248, 255, 255, 128, 128, 128, 128, 128, 128 },
 105       { 190, 36, 230, 255, 236, 255, 128, 128, 128, 128, 128 },
 106       { 149, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 }
 107     },
 108     { { 1, 226, 255, 128, 128, 128, 128, 128, 128, 128, 128 },
 109       { 247, 192, 255, 128, 128, 128, 128, 128, 128, 128, 128 },
 110       { 240, 128, 255, 128, 128, 128, 128, 128, 128, 128, 128 }
 111     },
 112     { { 1, 134, 252, 255, 255, 128, 128, 128, 128, 128, 128 },
 113       { 213, 62, 250, 255, 255, 128, 128, 128, 128, 128, 128 },
 114       { 55, 93, 255, 128, 128, 128, 128, 128, 128, 128, 128 }
 115     },
 116     { { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 },
 117       { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 },
 118       { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 }
 119     }
 120   },
 121   { { { 202, 24, 213, 235, 186, 191, 220, 160, 240, 175, 255 },
 122       { 126, 38, 182, 232, 169, 184, 228, 174, 255, 187, 128 },
 123       { 61, 46, 138, 219, 151, 178, 240, 170, 255, 216, 128 }
 124     },
 125     { { 1, 112, 230, 250, 199, 191, 247, 159, 255, 255, 128 },
 126       { 166, 109, 228, 252, 211, 215, 255, 174, 128, 128, 128 },
 127       { 39, 77, 162, 232, 172, 180, 245, 178, 255, 255, 128 }
 128     },
 129     { { 1, 52, 220, 246, 198, 199, 249, 220, 255, 255, 128 },
 130       { 124, 74, 191, 243, 183, 193, 250, 221, 255, 255, 128 },
 131       { 24, 71, 130, 219, 154, 170, 243, 182, 255, 255, 128 }
 132     },
 133     { { 1, 182, 225, 249, 219, 240, 255, 224, 128, 128, 128 },
 134       { 149, 150, 226, 252, 216, 205, 255, 171, 128, 128, 128 },
 135       { 28, 108, 170, 242, 183, 194, 254, 223, 255, 255, 128 }
 136     },
 137     { { 1, 81, 230, 252, 204, 203, 255, 192, 128, 128, 128 },
 138       { 123, 102, 209, 247, 188, 196, 255, 233, 128, 128, 128 },
 139       { 20, 95, 153, 243, 164, 173, 255, 203, 128, 128, 128 }
 140     },
 141     { { 1, 222, 248, 255, 216, 213, 128, 128, 128, 128, 128 },
 142       { 168, 175, 246, 252, 235, 205, 255, 255, 128, 128, 128 },
 143       { 47, 116, 215, 255, 211, 212, 255, 255, 128, 128, 128 }
 144     },
 145     { { 1, 121, 236, 253, 212, 214, 255, 255, 128, 128, 128 },
 146       { 141, 84, 213, 252, 201, 202, 255, 219, 128, 128, 128 },
 147       { 42, 80, 160, 240, 162, 185, 255, 205, 128, 128, 128 }
 148     },
 149     { { 1, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 },
 150       { 244, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 },
 151       { 238, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 }
 152     }
 153   }
 154 };
 155
 156 void VP8DefaultProbas(VP8Encoder* const enc) {
 157   VP8Proba* const probas = &enc->proba_;
 158   probas->use_skip_proba_ = 0;
 159   memset(probas->segments_, 255u, sizeof(probas->segments_));
 160   memcpy(probas->coeffs_, VP8CoeffsProba0, sizeof(VP8CoeffsProba0));
 161   // Note: we could hard-code the level_costs_ corresponding to VP8CoeffsProba0,
 162   // but that's ~11k of static data. Better call VP8CalculateLevelCosts() later.
 163   probas->dirty_ = 1;
 164 }
 165
 166 // Paragraph 11.5.  900bytes.
 167 static const uint8_t kBModesProba[NUM_BMODES][NUM_BMODES][NUM_BMODES - 1] = {
 168   { { 231, 120, 48, 89, 115, 113, 120, 152, 112 },
 169     { 152, 179, 64, 126, 170, 118, 46, 70, 95 },
 170     { 175, 69, 143, 80, 85, 82, 72, 155, 103 },
 171     { 56, 58, 10, 171, 218, 189, 17, 13, 152 },
 172     { 114, 26, 17, 163, 44, 195, 21, 10, 173 },
 173     { 121, 24, 80, 195, 26, 62, 44, 64, 85 },
 174     { 144, 71, 10, 38, 171, 213, 144, 34, 26 },
 175     { 170, 46, 55, 19, 136, 160, 33, 206, 71 },
 176     { 63, 20, 8, 114, 114, 208, 12, 9, 226 },
 177     { 81, 40, 11, 96, 182, 84, 29, 16, 36 } },
 178   { { 134, 183, 89, 137, 98, 101, 106, 165, 148 },
 179     { 72, 187, 100, 130, 157, 111, 32, 75, 80 },
 180     { 66, 102, 167, 99, 74, 62, 40, 234, 128 },
 181     { 41, 53, 9, 178, 241, 141, 26, 8, 107 },
 182     { 74, 43, 26, 146, 73, 166, 49, 23, 157 },
 183     { 65, 38, 105, 160, 51, 52, 31, 115, 128 },
 184     { 104, 79, 12, 27, 217, 255, 87, 17, 7 },
 185     { 87, 68, 71, 44, 114, 51, 15, 186, 23 },
 186     { 47, 41, 14, 110, 182, 183, 21, 17, 194 },
 187     { 66, 45, 25, 102, 197, 189, 23, 18, 22 } },
 188   { { 88, 88, 147, 150, 42, 46, 45, 196, 205 },
 189     { 43, 97, 183, 117, 85, 38, 35, 179, 61 },
 190     { 39, 53, 200, 87, 26, 21, 43, 232, 171 },
 191     { 56, 34, 51, 104, 114, 102, 29, 93, 77 },
 192     { 39, 28, 85, 171, 58, 165, 90, 98, 64 },
 193     { 34, 22, 116, 206, 23, 34, 43, 166, 73 },
 194     { 107, 54, 32, 26, 51, 1, 81, 43, 31 },
 195     { 68, 25, 106, 22, 64, 171, 36, 225, 114 },
 196     { 34, 19, 21, 102, 132, 188, 16, 76, 124 },
 197     { 62, 18, 78, 95, 85, 57, 50, 48, 51 } },
 198   { { 193, 101, 35, 159, 215, 111, 89, 46, 111 },
 199     { 60, 148, 31, 172, 219, 228, 21, 18, 111 },
 200     { 112, 113, 77, 85, 179, 255, 38, 120, 114 },
 201     { 40, 42, 1, 196, 245, 209, 10, 25, 109 },
 202     { 88, 43, 29, 140, 166, 213, 37, 43, 154 },
 203     { 61, 63, 30, 155, 67, 45, 68, 1, 209 },
 204     { 100, 80, 8, 43, 154, 1, 51, 26, 71 },
 205     { 142, 78, 78, 16, 255, 128, 34, 197, 171 },
 206     { 41, 40, 5, 102, 211, 183, 4, 1, 221 },
 207     { 51, 50, 17, 168, 209, 192, 23, 25, 82 } },
 208   { { 138, 31, 36, 171, 27, 166, 38, 44, 229 },
 209     { 67, 87, 58, 169, 82, 115, 26, 59, 179 },
 210     { 63, 59, 90, 180, 59, 166, 93, 73, 154 },
 211     { 40, 40, 21, 116, 143, 209, 34, 39, 175 },
 212     { 47, 15, 16, 183, 34, 223, 49, 45, 183 },
 213     { 46, 17, 33, 183, 6, 98, 15, 32, 183 },
 214     { 57, 46, 22, 24, 128, 1, 54, 17, 37 },
 215     { 65, 32, 73, 115, 28, 128, 23, 128, 205 },
 216     { 40, 3, 9, 115, 51, 192, 18, 6, 223 },
 217     { 87, 37, 9, 115, 59, 77, 64, 21, 47 } },
 218   { { 104, 55, 44, 218, 9, 54, 53, 130, 226 },
 219     { 64, 90, 70, 205, 40, 41, 23, 26, 57 },
 220     { 54, 57, 112, 184, 5, 41, 38, 166, 213 },
 221     { 30, 34, 26, 133, 152, 116, 10, 32, 134 },
 222     { 39, 19, 53, 221, 26, 114, 32, 73, 255 },
 223     { 31, 9, 65, 234, 2, 15, 1, 118, 73 },
 224     { 75, 32, 12, 51, 192, 255, 160, 43, 51 },
 225     { 88, 31, 35, 67, 102, 85, 55, 186, 85 },
 226     { 56, 21, 23, 111, 59, 205, 45, 37, 192 },
 227     { 55, 38, 70, 124, 73, 102, 1, 34, 98 } },
 228   { { 125, 98, 42, 88, 104, 85, 117, 175, 82 },
 229     { 95, 84, 53, 89, 128, 100, 113, 101, 45 },
 230     { 75, 79, 123, 47, 51, 128, 81, 171, 1 },
 231     { 57, 17, 5, 71, 102, 57, 53, 41, 49 },
 232     { 38, 33, 13, 121, 57, 73, 26, 1, 85 },
 233     { 41, 10, 67, 138, 77, 110, 90, 47, 114 },
 234     { 115, 21, 2, 10, 102, 255, 166, 23, 6 },
 235     { 101, 29, 16, 10, 85, 128, 101, 196, 26 },
 236     { 57, 18, 10, 102, 102, 213, 34, 20, 43 },
 237     { 117, 20, 15, 36, 163, 128, 68, 1, 26 } },
 238   { { 102, 61, 71, 37, 34, 53, 31, 243, 192 },
 239     { 69, 60, 71, 38, 73, 119, 28, 222, 37 },
 240     { 68, 45, 128, 34, 1, 47, 11, 245, 171 },
 241     { 62, 17, 19, 70, 146, 85, 55, 62, 70 },
 242     { 37, 43, 37, 154, 100, 163, 85, 160, 1 },
 243     { 63, 9, 92, 136, 28, 64, 32, 201, 85 },
 244     { 75, 15, 9, 9, 64, 255, 184, 119, 16 },
 245     { 86, 6, 28, 5, 64, 255, 25, 248, 1 },
 246     { 56, 8, 17, 132, 137, 255, 55, 116, 128 },
 247     { 58, 15, 20, 82, 135, 57, 26, 121, 40 } },
 248   { { 164, 50, 31, 137, 154, 133, 25, 35, 218 },
 249     { 51, 103, 44, 131, 131, 123, 31, 6, 158 },
 250     { 86, 40, 64, 135, 148, 224, 45, 183, 128 },
 251     { 22, 26, 17, 131, 240, 154, 14, 1, 209 },
 252     { 45, 16, 21, 91, 64, 222, 7, 1, 197 },
 253     { 56, 21, 39, 155, 60, 138, 23, 102, 213 },
 254     { 83, 12, 13, 54, 192, 255, 68, 47, 28 },
 255     { 85, 26, 85, 85, 128, 128, 32, 146, 171 },
 256     { 18, 11, 7, 63, 144, 171, 4, 4, 246 },
 257     { 35, 27, 10, 146, 174, 171, 12, 26, 128 } },
 258   { { 190, 80, 35, 99, 180, 80, 126, 54, 45 },
 259     { 85, 126, 47, 87, 176, 51, 41, 20, 32 },
 260     { 101, 75, 128, 139, 118, 146, 116, 128, 85 },
 261     { 56, 41, 15, 176, 236, 85, 37, 9, 62 },
 262     { 71, 30, 17, 119, 118, 255, 17, 18, 138 },
 263     { 101, 38, 60, 138, 55, 70, 43, 26, 142 },
 264     { 146, 36, 19, 30, 171, 255, 97, 27, 20 },
 265     { 138, 45, 61, 62, 219, 1, 81, 188, 64 },
 266     { 32, 41, 20, 117, 151, 142, 20, 21, 163 },
 267     { 112, 19, 12, 61, 195, 128, 48, 4, 24 } }
 268 };
 269
 270 static int PutI4Mode(VP8BitWriter* const bw, int mode,
 271                      const uint8_t* const prob) {
 272   if (VP8PutBit(bw, mode != B_DC_PRED, prob[0])) {
 273     if (VP8PutBit(bw, mode != B_TM_PRED, prob[1])) {
 274       if (VP8PutBit(bw, mode != B_VE_PRED, prob[2])) {
 275         if (!VP8PutBit(bw, mode >= B_LD_PRED, prob[3])) {
 276           if (VP8PutBit(bw, mode != B_HE_PRED, prob[4])) {
 277             VP8PutBit(bw, mode != B_RD_PRED, prob[5]);
 278           }
 279         } else {
 280           if (VP8PutBit(bw, mode != B_LD_PRED, prob[6])) {
 281             if (VP8PutBit(bw, mode != B_VL_PRED, prob[7])) {
 282               VP8PutBit(bw, mode != B_HD_PRED, prob[8]);
 283             }
 284           }
 285         }
 286       }
 287     }
 288   }
 289   return mode;
 290 }
 291
 292 static void PutI16Mode(VP8BitWriter* const bw, int mode) {
 293   if (VP8PutBit(bw, (mode == TM_PRED || mode == H_PRED), 156)) {
 294     VP8PutBit(bw, mode == TM_PRED, 128);    // TM or HE
 295   } else {
 296     VP8PutBit(bw, mode == V_PRED, 163);     // VE or DC
 297   }
 298 }
 299
 300 static void PutUVMode(VP8BitWriter* const bw, int uv_mode) {
 301   if (VP8PutBit(bw, uv_mode != DC_PRED, 142)) {
 302     if (VP8PutBit(bw, uv_mode != V_PRED, 114)) {
 303       VP8PutBit(bw, uv_mode != H_PRED, 183);    // else: TM_PRED
 304     }
 305   }
 306 }
 307
 308 static void PutSegment(VP8BitWriter* const bw, int s, const uint8_t* p) {
 309   if (VP8PutBit(bw, s >= 2, p[0])) p += 1;
 310   VP8PutBit(bw, s & 1, p[1]);
 311 }
 312
 313 void VP8CodeIntraModes(VP8Encoder* const enc) {
 314   VP8BitWriter* const bw = &enc->bw_;
 315   VP8EncIterator it;
 316   VP8IteratorInit(enc, &it);
 317   do {
 318     const VP8MBInfo* const mb = it.mb_;
 319     const uint8_t* preds = it.preds_;
 320     if (enc->segment_hdr_.update_map_) {
 321       PutSegment(bw, mb->segment_, enc->proba_.segments_);
 322     }
 323     if (enc->proba_.use_skip_proba_) {
 324       VP8PutBit(bw, mb->skip_, enc->proba_.skip_proba_);
 325     }
 326     if (VP8PutBit(bw, (mb->type_ != 0), 145)) {  // i16x16
 327       PutI16Mode(bw, preds[0]);
 328     } else {
 329       const int preds_w = enc->preds_w_;
 330       const uint8_t* top_pred = preds - preds_w;
 331       int x, y;
 332       for (y = 0; y < 4; ++y) {
 333         int left = preds[-1];
 334         for (x = 0; x < 4; ++x) {
 335           const uint8_t* const probas = kBModesProba[top_pred[x]][left];
 336           left = PutI4Mode(bw, preds[x], probas);
 337         }
 338         top_pred = preds;
 339         preds += preds_w;
 340       }
 341     }
 342     PutUVMode(bw, mb->uv_mode_);
 343   } while (VP8IteratorNext(&it));
 344 }
 345
 346 //------------------------------------------------------------------------------
 347 // Paragraph 13
 348
 349 const uint8_t
 350     VP8CoeffsUpdateProba[NUM_TYPES][NUM_BANDS][NUM_CTX][NUM_PROBAS] = {
 351   { { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
 352       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
 353       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
 354     },
 355     { { 176, 246, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
 356       { 223, 241, 252, 255, 255, 255, 255, 255, 255, 255, 255 },
 357       { 249, 253, 253, 255, 255, 255, 255, 255, 255, 255, 255 }
 358     },
 359     { { 255, 244, 252, 255, 255, 255, 255, 255, 255, 255, 255 },
 360       { 234, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
 361       { 253, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
 362     },
 363     { { 255, 246, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
 364       { 239, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
 365       { 254, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255 }
 366     },
 367     { { 255, 248, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
 368       { 251, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
 369       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
 370     },
 371     { { 255, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
 372       { 251, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
 373       { 254, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255 }
 374     },
 375     { { 255, 254, 253, 255, 254, 255, 255, 255, 255, 255, 255 },
 376       { 250, 255, 254, 255, 254, 255, 255, 255, 255, 255, 255 },
 377       { 254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
 378     },
 379     { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
 380       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
 381       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
 382     }
 383   },
 384   { { { 217, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
 385       { 225, 252, 241, 253, 255, 255, 254, 255, 255, 255, 255 },
 386       { 234, 250, 241, 250, 253, 255, 253, 254, 255, 255, 255 }
 387     },
 388     { { 255, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
 389       { 223, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
 390       { 238, 253, 254, 254, 255, 255, 255, 255, 255, 255, 255 }
 391     },
 392     { { 255, 248, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
 393       { 249, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
 394       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
 395     },
 396     { { 255, 253, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
 397       { 247, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
 398       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
 399     },
 400     { { 255, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
 401       { 252, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
 402       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
 403     },
 404     { { 255, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
 405       { 253, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
 406       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
 407     },
 408     { { 255, 254, 253, 255, 255, 255, 255, 255, 255, 255, 255 },
 409       { 250, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
 410       { 254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
 411     },
 412     { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
 413       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
 414       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
 415     }
 416   },
 417   { { { 186, 251, 250, 255, 255, 255, 255, 255, 255, 255, 255 },
 418       { 234, 251, 244, 254, 255, 255, 255, 255, 255, 255, 255 },
 419       { 251, 251, 243, 253, 254, 255, 254, 255, 255, 255, 255 }
 420     },
 421     { { 255, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
 422       { 236, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
 423       { 251, 253, 253, 254, 254, 255, 255, 255, 255, 255, 255 }
 424     },
 425     { { 255, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
 426       { 254, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
 427       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
 428     },
 429     { { 255, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
 430       { 254, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
 431       { 254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
 432     },
 433     { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
 434       { 254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
 435       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
 436     },
 437     { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
 438       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
 439       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
 440     },
 441     { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
 442       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
 443       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
 444     },
 445     { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
 446       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
 447       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
 448     }
 449   },
 450   { { { 248, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
 451       { 250, 254, 252, 254, 255, 255, 255, 255, 255, 255, 255 },
 452       { 248, 254, 249, 253, 255, 255, 255, 255, 255, 255, 255 }
 453     },
 454     { { 255, 253, 253, 255, 255, 255, 255, 255, 255, 255, 255 },
 455       { 246, 253, 253, 255, 255, 255, 255, 255, 255, 255, 255 },
 456       { 252, 254, 251, 254, 254, 255, 255, 255, 255, 255, 255 }
 457     },
 458     { { 255, 254, 252, 255, 255, 255, 255, 255, 255, 255, 255 },
 459       { 248, 254, 253, 255, 255, 255, 255, 255, 255, 255, 255 },
 460       { 253, 255, 254, 254, 255, 255, 255, 255, 255, 255, 255 }
 461     },
 462     { { 255, 251, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
 463       { 245, 251, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
 464       { 253, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 }
 465     },
 466     { { 255, 251, 253, 255, 255, 255, 255, 255, 255, 255, 255 },
 467       { 252, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
 468       { 255, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
 469     },
 470     { { 255, 252, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
 471       { 249, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
 472       { 255, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255 }
 473     },
 474     { { 255, 255, 253, 255, 255, 255, 255, 255, 255, 255, 255 },
 475       { 250, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
 476       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
 477     },
 478     { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
 479       { 254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
 480       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
 481     }
 482   }
 483 };
 484
 485 void VP8WriteProbas(VP8BitWriter* const bw, const VP8Proba* const probas) {
 486   int t, b, c, p;
 487   for (t = 0; t < NUM_TYPES; ++t) {
 488     for (b = 0; b < NUM_BANDS; ++b) {
 489       for (c = 0; c < NUM_CTX; ++c) {
 490         for (p = 0; p < NUM_PROBAS; ++p) {
 491           const uint8_t p0 = probas->coeffs_[t][b][c][p];
 492           const int update = (p0 != VP8CoeffsProba0[t][b][c][p]);
 493           if (VP8PutBit(bw, update, VP8CoeffsUpdateProba[t][b][c][p])) {
 494             VP8PutValue(bw, p0, 8);
 495           }
 496         }
 497       }
 498     }
 499   }
 500   if (VP8PutBitUniform(bw, probas->use_skip_proba_)) {
 501     VP8PutValue(bw, probas->skip_proba_, 8);
 502   }
 503 }
 504