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      1 // Copyright 2011 Google Inc.
      2 //
      3 // This code is licensed under the same terms as WebM:
      4 //  Software License Agreement:  http://www.webmproject.org/license/software/
      5 //  Additional IP Rights Grant:  http://www.webmproject.org/license/additional/
      6 // -----------------------------------------------------------------------------
      7 //
      8 // Token probabilities
      9 //
     10 // Author: Skal (pascal.massimino (at) gmail.com)
     11 
     12 #include "vp8enci.h"
     13 
     14 #if defined(__cplusplus) || defined(c_plusplus)
     15 extern "C" {
     16 #endif
     17 
     18 //-----------------------------------------------------------------------------
     19 // Default probabilities
     20 
     21 // Paragraph 13.5
     22 const uint8_t
     23   VP8CoeffsProba0[NUM_TYPES][NUM_BANDS][NUM_CTX][NUM_PROBAS] = {
     24   // genereated using vp8_default_coef_probs() in entropy.c:129
     25   { { { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 },
     26       { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 },
     27       { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 }
     28     },
     29     { { 253, 136, 254, 255, 228, 219, 128, 128, 128, 128, 128 },
     30       { 189, 129, 242, 255, 227, 213, 255, 219, 128, 128, 128 },
     31       { 106, 126, 227, 252, 214, 209, 255, 255, 128, 128, 128 }
     32     },
     33     { { 1, 98, 248, 255, 236, 226, 255, 255, 128, 128, 128 },
     34       { 181, 133, 238, 254, 221, 234, 255, 154, 128, 128, 128 },
     35       { 78, 134, 202, 247, 198, 180, 255, 219, 128, 128, 128 },
     36     },
     37     { { 1, 185, 249, 255, 243, 255, 128, 128, 128, 128, 128 },
     38       { 184, 150, 247, 255, 236, 224, 128, 128, 128, 128, 128 },
     39       { 77, 110, 216, 255, 236, 230, 128, 128, 128, 128, 128 },
     40     },
     41     { { 1, 101, 251, 255, 241, 255, 128, 128, 128, 128, 128 },
     42       { 170, 139, 241, 252, 236, 209, 255, 255, 128, 128, 128 },
     43       { 37, 116, 196, 243, 228, 255, 255, 255, 128, 128, 128 }
     44     },
     45     { { 1, 204, 254, 255, 245, 255, 128, 128, 128, 128, 128 },
     46       { 207, 160, 250, 255, 238, 128, 128, 128, 128, 128, 128 },
     47       { 102, 103, 231, 255, 211, 171, 128, 128, 128, 128, 128 }
     48     },
     49     { { 1, 152, 252, 255, 240, 255, 128, 128, 128, 128, 128 },
     50       { 177, 135, 243, 255, 234, 225, 128, 128, 128, 128, 128 },
     51       { 80, 129, 211, 255, 194, 224, 128, 128, 128, 128, 128 }
     52     },
     53     { { 1, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 },
     54       { 246, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 },
     55       { 255, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 }
     56     }
     57   },
     58   { { { 198, 35, 237, 223, 193, 187, 162, 160, 145, 155, 62 },
     59       { 131, 45, 198, 221, 172, 176, 220, 157, 252, 221, 1 },
     60       { 68, 47, 146, 208, 149, 167, 221, 162, 255, 223, 128 }
     61     },
     62     { { 1, 149, 241, 255, 221, 224, 255, 255, 128, 128, 128 },
     63       { 184, 141, 234, 253, 222, 220, 255, 199, 128, 128, 128 },
     64       { 81, 99, 181, 242, 176, 190, 249, 202, 255, 255, 128 }
     65     },
     66     { { 1, 129, 232, 253, 214, 197, 242, 196, 255, 255, 128 },
     67       { 99, 121, 210, 250, 201, 198, 255, 202, 128, 128, 128 },
     68       { 23, 91, 163, 242, 170, 187, 247, 210, 255, 255, 128 }
     69     },
     70     { { 1, 200, 246, 255, 234, 255, 128, 128, 128, 128, 128 },
     71       { 109, 178, 241, 255, 231, 245, 255, 255, 128, 128, 128 },
     72       { 44, 130, 201, 253, 205, 192, 255, 255, 128, 128, 128 }
     73     },
     74     { { 1, 132, 239, 251, 219, 209, 255, 165, 128, 128, 128 },
     75       { 94, 136, 225, 251, 218, 190, 255, 255, 128, 128, 128 },
     76       { 22, 100, 174, 245, 186, 161, 255, 199, 128, 128, 128 }
     77     },
     78     { { 1, 182, 249, 255, 232, 235, 128, 128, 128, 128, 128 },
     79       { 124, 143, 241, 255, 227, 234, 128, 128, 128, 128, 128 },
     80       { 35, 77, 181, 251, 193, 211, 255, 205, 128, 128, 128 }
     81     },
     82     { { 1, 157, 247, 255, 236, 231, 255, 255, 128, 128, 128 },
     83       { 121, 141, 235, 255, 225, 227, 255, 255, 128, 128, 128 },
     84       { 45, 99, 188, 251, 195, 217, 255, 224, 128, 128, 128 }
     85     },
     86     { { 1, 1, 251, 255, 213, 255, 128, 128, 128, 128, 128 },
     87       { 203, 1, 248, 255, 255, 128, 128, 128, 128, 128, 128 },
     88       { 137, 1, 177, 255, 224, 255, 128, 128, 128, 128, 128 }
     89     }
     90   },
     91   { { { 253, 9, 248, 251, 207, 208, 255, 192, 128, 128, 128 },
     92       { 175, 13, 224, 243, 193, 185, 249, 198, 255, 255, 128 },
     93       { 73, 17, 171, 221, 161, 179, 236, 167, 255, 234, 128 }
     94     },
     95     { { 1, 95, 247, 253, 212, 183, 255, 255, 128, 128, 128 },
     96       { 239, 90, 244, 250, 211, 209, 255, 255, 128, 128, 128 },
     97       { 155, 77, 195, 248, 188, 195, 255, 255, 128, 128, 128 }
     98     },
     99     { { 1, 24, 239, 251, 218, 219, 255, 205, 128, 128, 128 },
    100       { 201, 51, 219, 255, 196, 186, 128, 128, 128, 128, 128 },
    101       { 69, 46, 190, 239, 201, 218, 255, 228, 128, 128, 128 }
    102     },
    103     { { 1, 191, 251, 255, 255, 128, 128, 128, 128, 128, 128 },
    104       { 223, 165, 249, 255, 213, 255, 128, 128, 128, 128, 128 },
    105       { 141, 124, 248, 255, 255, 128, 128, 128, 128, 128, 128 }
    106     },
    107     { { 1, 16, 248, 255, 255, 128, 128, 128, 128, 128, 128 },
    108       { 190, 36, 230, 255, 236, 255, 128, 128, 128, 128, 128 },
    109       { 149, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 }
    110     },
    111     { { 1, 226, 255, 128, 128, 128, 128, 128, 128, 128, 128 },
    112       { 247, 192, 255, 128, 128, 128, 128, 128, 128, 128, 128 },
    113       { 240, 128, 255, 128, 128, 128, 128, 128, 128, 128, 128 }
    114     },
    115     { { 1, 134, 252, 255, 255, 128, 128, 128, 128, 128, 128 },
    116       { 213, 62, 250, 255, 255, 128, 128, 128, 128, 128, 128 },
    117       { 55, 93, 255, 128, 128, 128, 128, 128, 128, 128, 128 }
    118     },
    119     { { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 },
    120       { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 },
    121       { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 }
    122     }
    123   },
    124   { { { 202, 24, 213, 235, 186, 191, 220, 160, 240, 175, 255 },
    125       { 126, 38, 182, 232, 169, 184, 228, 174, 255, 187, 128 },
    126       { 61, 46, 138, 219, 151, 178, 240, 170, 255, 216, 128 }
    127     },
    128     { { 1, 112, 230, 250, 199, 191, 247, 159, 255, 255, 128 },
    129       { 166, 109, 228, 252, 211, 215, 255, 174, 128, 128, 128 },
    130       { 39, 77, 162, 232, 172, 180, 245, 178, 255, 255, 128 }
    131     },
    132     { { 1, 52, 220, 246, 198, 199, 249, 220, 255, 255, 128 },
    133       { 124, 74, 191, 243, 183, 193, 250, 221, 255, 255, 128 },
    134       { 24, 71, 130, 219, 154, 170, 243, 182, 255, 255, 128 }
    135     },
    136     { { 1, 182, 225, 249, 219, 240, 255, 224, 128, 128, 128 },
    137       { 149, 150, 226, 252, 216, 205, 255, 171, 128, 128, 128 },
    138       { 28, 108, 170, 242, 183, 194, 254, 223, 255, 255, 128 }
    139     },
    140     { { 1, 81, 230, 252, 204, 203, 255, 192, 128, 128, 128 },
    141       { 123, 102, 209, 247, 188, 196, 255, 233, 128, 128, 128 },
    142       { 20, 95, 153, 243, 164, 173, 255, 203, 128, 128, 128 }
    143     },
    144     { { 1, 222, 248, 255, 216, 213, 128, 128, 128, 128, 128 },
    145       { 168, 175, 246, 252, 235, 205, 255, 255, 128, 128, 128 },
    146       { 47, 116, 215, 255, 211, 212, 255, 255, 128, 128, 128 }
    147     },
    148     { { 1, 121, 236, 253, 212, 214, 255, 255, 128, 128, 128 },
    149       { 141, 84, 213, 252, 201, 202, 255, 219, 128, 128, 128 },
    150       { 42, 80, 160, 240, 162, 185, 255, 205, 128, 128, 128 }
    151     },
    152     { { 1, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 },
    153       { 244, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 },
    154       { 238, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 }
    155     }
    156   }
    157 };
    158 
    159 void VP8DefaultProbas(VP8Encoder* const enc) {
    160   VP8Proba* const probas = &enc->proba_;
    161   memset(probas->segments_, 255u, sizeof(probas->segments_));
    162   memcpy(probas->coeffs_, VP8CoeffsProba0, sizeof(VP8CoeffsProba0));
    163   probas->use_skip_proba_ = 0;
    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* 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, 0));
    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 
    505 #if defined(__cplusplus) || defined(c_plusplus)
    506 }    // extern "C"
    507 #endif
    508