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      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 // Token probabilities
     11 //
     12 // Author: Skal (pascal.massimino (at) gmail.com)
     13 
     14 #include "./vp8enci.h"
     15 
     16 #if defined(__cplusplus) || defined(c_plusplus)
     17 extern "C" {
     18 #endif
     19 
     20 //------------------------------------------------------------------------------
     21 // Default probabilities
     22 
     23 // Paragraph 13.5
     24 const uint8_t
     25   VP8CoeffsProba0[NUM_TYPES][NUM_BANDS][NUM_CTX][NUM_PROBAS] = {
     26   // genereated using vp8_default_coef_probs() in entropy.c:129
     27   { { { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 },
     28       { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 },
     29       { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 }
     30     },
     31     { { 253, 136, 254, 255, 228, 219, 128, 128, 128, 128, 128 },
     32       { 189, 129, 242, 255, 227, 213, 255, 219, 128, 128, 128 },
     33       { 106, 126, 227, 252, 214, 209, 255, 255, 128, 128, 128 }
     34     },
     35     { { 1, 98, 248, 255, 236, 226, 255, 255, 128, 128, 128 },
     36       { 181, 133, 238, 254, 221, 234, 255, 154, 128, 128, 128 },
     37       { 78, 134, 202, 247, 198, 180, 255, 219, 128, 128, 128 },
     38     },
     39     { { 1, 185, 249, 255, 243, 255, 128, 128, 128, 128, 128 },
     40       { 184, 150, 247, 255, 236, 224, 128, 128, 128, 128, 128 },
     41       { 77, 110, 216, 255, 236, 230, 128, 128, 128, 128, 128 },
     42     },
     43     { { 1, 101, 251, 255, 241, 255, 128, 128, 128, 128, 128 },
     44       { 170, 139, 241, 252, 236, 209, 255, 255, 128, 128, 128 },
     45       { 37, 116, 196, 243, 228, 255, 255, 255, 128, 128, 128 }
     46     },
     47     { { 1, 204, 254, 255, 245, 255, 128, 128, 128, 128, 128 },
     48       { 207, 160, 250, 255, 238, 128, 128, 128, 128, 128, 128 },
     49       { 102, 103, 231, 255, 211, 171, 128, 128, 128, 128, 128 }
     50     },
     51     { { 1, 152, 252, 255, 240, 255, 128, 128, 128, 128, 128 },
     52       { 177, 135, 243, 255, 234, 225, 128, 128, 128, 128, 128 },
     53       { 80, 129, 211, 255, 194, 224, 128, 128, 128, 128, 128 }
     54     },
     55     { { 1, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 },
     56       { 246, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 },
     57       { 255, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 }
     58     }
     59   },
     60   { { { 198, 35, 237, 223, 193, 187, 162, 160, 145, 155, 62 },
     61       { 131, 45, 198, 221, 172, 176, 220, 157, 252, 221, 1 },
     62       { 68, 47, 146, 208, 149, 167, 221, 162, 255, 223, 128 }
     63     },
     64     { { 1, 149, 241, 255, 221, 224, 255, 255, 128, 128, 128 },
     65       { 184, 141, 234, 253, 222, 220, 255, 199, 128, 128, 128 },
     66       { 81, 99, 181, 242, 176, 190, 249, 202, 255, 255, 128 }
     67     },
     68     { { 1, 129, 232, 253, 214, 197, 242, 196, 255, 255, 128 },
     69       { 99, 121, 210, 250, 201, 198, 255, 202, 128, 128, 128 },
     70       { 23, 91, 163, 242, 170, 187, 247, 210, 255, 255, 128 }
     71     },
     72     { { 1, 200, 246, 255, 234, 255, 128, 128, 128, 128, 128 },
     73       { 109, 178, 241, 255, 231, 245, 255, 255, 128, 128, 128 },
     74       { 44, 130, 201, 253, 205, 192, 255, 255, 128, 128, 128 }
     75     },
     76     { { 1, 132, 239, 251, 219, 209, 255, 165, 128, 128, 128 },
     77       { 94, 136, 225, 251, 218, 190, 255, 255, 128, 128, 128 },
     78       { 22, 100, 174, 245, 186, 161, 255, 199, 128, 128, 128 }
     79     },
     80     { { 1, 182, 249, 255, 232, 235, 128, 128, 128, 128, 128 },
     81       { 124, 143, 241, 255, 227, 234, 128, 128, 128, 128, 128 },
     82       { 35, 77, 181, 251, 193, 211, 255, 205, 128, 128, 128 }
     83     },
     84     { { 1, 157, 247, 255, 236, 231, 255, 255, 128, 128, 128 },
     85       { 121, 141, 235, 255, 225, 227, 255, 255, 128, 128, 128 },
     86       { 45, 99, 188, 251, 195, 217, 255, 224, 128, 128, 128 }
     87     },
     88     { { 1, 1, 251, 255, 213, 255, 128, 128, 128, 128, 128 },
     89       { 203, 1, 248, 255, 255, 128, 128, 128, 128, 128, 128 },
     90       { 137, 1, 177, 255, 224, 255, 128, 128, 128, 128, 128 }
     91     }
     92   },
     93   { { { 253, 9, 248, 251, 207, 208, 255, 192, 128, 128, 128 },
     94       { 175, 13, 224, 243, 193, 185, 249, 198, 255, 255, 128 },
     95       { 73, 17, 171, 221, 161, 179, 236, 167, 255, 234, 128 }
     96     },
     97     { { 1, 95, 247, 253, 212, 183, 255, 255, 128, 128, 128 },
     98       { 239, 90, 244, 250, 211, 209, 255, 255, 128, 128, 128 },
     99       { 155, 77, 195, 248, 188, 195, 255, 255, 128, 128, 128 }
    100     },
    101     { { 1, 24, 239, 251, 218, 219, 255, 205, 128, 128, 128 },
    102       { 201, 51, 219, 255, 196, 186, 128, 128, 128, 128, 128 },
    103       { 69, 46, 190, 239, 201, 218, 255, 228, 128, 128, 128 }
    104     },
    105     { { 1, 191, 251, 255, 255, 128, 128, 128, 128, 128, 128 },
    106       { 223, 165, 249, 255, 213, 255, 128, 128, 128, 128, 128 },
    107       { 141, 124, 248, 255, 255, 128, 128, 128, 128, 128, 128 }
    108     },
    109     { { 1, 16, 248, 255, 255, 128, 128, 128, 128, 128, 128 },
    110       { 190, 36, 230, 255, 236, 255, 128, 128, 128, 128, 128 },
    111       { 149, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 }
    112     },
    113     { { 1, 226, 255, 128, 128, 128, 128, 128, 128, 128, 128 },
    114       { 247, 192, 255, 128, 128, 128, 128, 128, 128, 128, 128 },
    115       { 240, 128, 255, 128, 128, 128, 128, 128, 128, 128, 128 }
    116     },
    117     { { 1, 134, 252, 255, 255, 128, 128, 128, 128, 128, 128 },
    118       { 213, 62, 250, 255, 255, 128, 128, 128, 128, 128, 128 },
    119       { 55, 93, 255, 128, 128, 128, 128, 128, 128, 128, 128 }
    120     },
    121     { { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 },
    122       { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 },
    123       { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 }
    124     }
    125   },
    126   { { { 202, 24, 213, 235, 186, 191, 220, 160, 240, 175, 255 },
    127       { 126, 38, 182, 232, 169, 184, 228, 174, 255, 187, 128 },
    128       { 61, 46, 138, 219, 151, 178, 240, 170, 255, 216, 128 }
    129     },
    130     { { 1, 112, 230, 250, 199, 191, 247, 159, 255, 255, 128 },
    131       { 166, 109, 228, 252, 211, 215, 255, 174, 128, 128, 128 },
    132       { 39, 77, 162, 232, 172, 180, 245, 178, 255, 255, 128 }
    133     },
    134     { { 1, 52, 220, 246, 198, 199, 249, 220, 255, 255, 128 },
    135       { 124, 74, 191, 243, 183, 193, 250, 221, 255, 255, 128 },
    136       { 24, 71, 130, 219, 154, 170, 243, 182, 255, 255, 128 }
    137     },
    138     { { 1, 182, 225, 249, 219, 240, 255, 224, 128, 128, 128 },
    139       { 149, 150, 226, 252, 216, 205, 255, 171, 128, 128, 128 },
    140       { 28, 108, 170, 242, 183, 194, 254, 223, 255, 255, 128 }
    141     },
    142     { { 1, 81, 230, 252, 204, 203, 255, 192, 128, 128, 128 },
    143       { 123, 102, 209, 247, 188, 196, 255, 233, 128, 128, 128 },
    144       { 20, 95, 153, 243, 164, 173, 255, 203, 128, 128, 128 }
    145     },
    146     { { 1, 222, 248, 255, 216, 213, 128, 128, 128, 128, 128 },
    147       { 168, 175, 246, 252, 235, 205, 255, 255, 128, 128, 128 },
    148       { 47, 116, 215, 255, 211, 212, 255, 255, 128, 128, 128 }
    149     },
    150     { { 1, 121, 236, 253, 212, 214, 255, 255, 128, 128, 128 },
    151       { 141, 84, 213, 252, 201, 202, 255, 219, 128, 128, 128 },
    152       { 42, 80, 160, 240, 162, 185, 255, 205, 128, 128, 128 }
    153     },
    154     { { 1, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 },
    155       { 244, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 },
    156       { 238, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 }
    157     }
    158   }
    159 };
    160 
    161 void VP8DefaultProbas(VP8Encoder* const enc) {
    162   VP8Proba* const probas = &enc->proba_;
    163   probas->use_skip_proba_ = 0;
    164   memset(probas->segments_, 255u, sizeof(probas->segments_));
    165   memcpy(probas->coeffs_, VP8CoeffsProba0, sizeof(VP8CoeffsProba0));
    166   // Note: we could hard-code the level_costs_ corresponding to VP8CoeffsProba0,
    167   // but that's ~11k of static data. Better call VP8CalculateLevelCosts() later.
    168   probas->dirty_ = 1;
    169 }
    170 
    171 // Paragraph 11.5.  900bytes.
    172 static const uint8_t kBModesProba[NUM_BMODES][NUM_BMODES][NUM_BMODES - 1] = {
    173   { { 231, 120, 48, 89, 115, 113, 120, 152, 112 },
    174     { 152, 179, 64, 126, 170, 118, 46, 70, 95 },
    175     { 175, 69, 143, 80, 85, 82, 72, 155, 103 },
    176     { 56, 58, 10, 171, 218, 189, 17, 13, 152 },
    177     { 114, 26, 17, 163, 44, 195, 21, 10, 173 },
    178     { 121, 24, 80, 195, 26, 62, 44, 64, 85 },
    179     { 144, 71, 10, 38, 171, 213, 144, 34, 26 },
    180     { 170, 46, 55, 19, 136, 160, 33, 206, 71 },
    181     { 63, 20, 8, 114, 114, 208, 12, 9, 226 },
    182     { 81, 40, 11, 96, 182, 84, 29, 16, 36 } },
    183   { { 134, 183, 89, 137, 98, 101, 106, 165, 148 },
    184     { 72, 187, 100, 130, 157, 111, 32, 75, 80 },
    185     { 66, 102, 167, 99, 74, 62, 40, 234, 128 },
    186     { 41, 53, 9, 178, 241, 141, 26, 8, 107 },
    187     { 74, 43, 26, 146, 73, 166, 49, 23, 157 },
    188     { 65, 38, 105, 160, 51, 52, 31, 115, 128 },
    189     { 104, 79, 12, 27, 217, 255, 87, 17, 7 },
    190     { 87, 68, 71, 44, 114, 51, 15, 186, 23 },
    191     { 47, 41, 14, 110, 182, 183, 21, 17, 194 },
    192     { 66, 45, 25, 102, 197, 189, 23, 18, 22 } },
    193   { { 88, 88, 147, 150, 42, 46, 45, 196, 205 },
    194     { 43, 97, 183, 117, 85, 38, 35, 179, 61 },
    195     { 39, 53, 200, 87, 26, 21, 43, 232, 171 },
    196     { 56, 34, 51, 104, 114, 102, 29, 93, 77 },
    197     { 39, 28, 85, 171, 58, 165, 90, 98, 64 },
    198     { 34, 22, 116, 206, 23, 34, 43, 166, 73 },
    199     { 107, 54, 32, 26, 51, 1, 81, 43, 31 },
    200     { 68, 25, 106, 22, 64, 171, 36, 225, 114 },
    201     { 34, 19, 21, 102, 132, 188, 16, 76, 124 },
    202     { 62, 18, 78, 95, 85, 57, 50, 48, 51 } },
    203   { { 193, 101, 35, 159, 215, 111, 89, 46, 111 },
    204     { 60, 148, 31, 172, 219, 228, 21, 18, 111 },
    205     { 112, 113, 77, 85, 179, 255, 38, 120, 114 },
    206     { 40, 42, 1, 196, 245, 209, 10, 25, 109 },
    207     { 88, 43, 29, 140, 166, 213, 37, 43, 154 },
    208     { 61, 63, 30, 155, 67, 45, 68, 1, 209 },
    209     { 100, 80, 8, 43, 154, 1, 51, 26, 71 },
    210     { 142, 78, 78, 16, 255, 128, 34, 197, 171 },
    211     { 41, 40, 5, 102, 211, 183, 4, 1, 221 },
    212     { 51, 50, 17, 168, 209, 192, 23, 25, 82 } },
    213   { { 138, 31, 36, 171, 27, 166, 38, 44, 229 },
    214     { 67, 87, 58, 169, 82, 115, 26, 59, 179 },
    215     { 63, 59, 90, 180, 59, 166, 93, 73, 154 },
    216     { 40, 40, 21, 116, 143, 209, 34, 39, 175 },
    217     { 47, 15, 16, 183, 34, 223, 49, 45, 183 },
    218     { 46, 17, 33, 183, 6, 98, 15, 32, 183 },
    219     { 57, 46, 22, 24, 128, 1, 54, 17, 37 },
    220     { 65, 32, 73, 115, 28, 128, 23, 128, 205 },
    221     { 40, 3, 9, 115, 51, 192, 18, 6, 223 },
    222     { 87, 37, 9, 115, 59, 77, 64, 21, 47 } },
    223   { { 104, 55, 44, 218, 9, 54, 53, 130, 226 },
    224     { 64, 90, 70, 205, 40, 41, 23, 26, 57 },
    225     { 54, 57, 112, 184, 5, 41, 38, 166, 213 },
    226     { 30, 34, 26, 133, 152, 116, 10, 32, 134 },
    227     { 39, 19, 53, 221, 26, 114, 32, 73, 255 },
    228     { 31, 9, 65, 234, 2, 15, 1, 118, 73 },
    229     { 75, 32, 12, 51, 192, 255, 160, 43, 51 },
    230     { 88, 31, 35, 67, 102, 85, 55, 186, 85 },
    231     { 56, 21, 23, 111, 59, 205, 45, 37, 192 },
    232     { 55, 38, 70, 124, 73, 102, 1, 34, 98 } },
    233   { { 125, 98, 42, 88, 104, 85, 117, 175, 82 },
    234     { 95, 84, 53, 89, 128, 100, 113, 101, 45 },
    235     { 75, 79, 123, 47, 51, 128, 81, 171, 1 },
    236     { 57, 17, 5, 71, 102, 57, 53, 41, 49 },
    237     { 38, 33, 13, 121, 57, 73, 26, 1, 85 },
    238     { 41, 10, 67, 138, 77, 110, 90, 47, 114 },
    239     { 115, 21, 2, 10, 102, 255, 166, 23, 6 },
    240     { 101, 29, 16, 10, 85, 128, 101, 196, 26 },
    241     { 57, 18, 10, 102, 102, 213, 34, 20, 43 },
    242     { 117, 20, 15, 36, 163, 128, 68, 1, 26 } },
    243   { { 102, 61, 71, 37, 34, 53, 31, 243, 192 },
    244     { 69, 60, 71, 38, 73, 119, 28, 222, 37 },
    245     { 68, 45, 128, 34, 1, 47, 11, 245, 171 },
    246     { 62, 17, 19, 70, 146, 85, 55, 62, 70 },
    247     { 37, 43, 37, 154, 100, 163, 85, 160, 1 },
    248     { 63, 9, 92, 136, 28, 64, 32, 201, 85 },
    249     { 75, 15, 9, 9, 64, 255, 184, 119, 16 },
    250     { 86, 6, 28, 5, 64, 255, 25, 248, 1 },
    251     { 56, 8, 17, 132, 137, 255, 55, 116, 128 },
    252     { 58, 15, 20, 82, 135, 57, 26, 121, 40 } },
    253   { { 164, 50, 31, 137, 154, 133, 25, 35, 218 },
    254     { 51, 103, 44, 131, 131, 123, 31, 6, 158 },
    255     { 86, 40, 64, 135, 148, 224, 45, 183, 128 },
    256     { 22, 26, 17, 131, 240, 154, 14, 1, 209 },
    257     { 45, 16, 21, 91, 64, 222, 7, 1, 197 },
    258     { 56, 21, 39, 155, 60, 138, 23, 102, 213 },
    259     { 83, 12, 13, 54, 192, 255, 68, 47, 28 },
    260     { 85, 26, 85, 85, 128, 128, 32, 146, 171 },
    261     { 18, 11, 7, 63, 144, 171, 4, 4, 246 },
    262     { 35, 27, 10, 146, 174, 171, 12, 26, 128 } },
    263   { { 190, 80, 35, 99, 180, 80, 126, 54, 45 },
    264     { 85, 126, 47, 87, 176, 51, 41, 20, 32 },
    265     { 101, 75, 128, 139, 118, 146, 116, 128, 85 },
    266     { 56, 41, 15, 176, 236, 85, 37, 9, 62 },
    267     { 71, 30, 17, 119, 118, 255, 17, 18, 138 },
    268     { 101, 38, 60, 138, 55, 70, 43, 26, 142 },
    269     { 146, 36, 19, 30, 171, 255, 97, 27, 20 },
    270     { 138, 45, 61, 62, 219, 1, 81, 188, 64 },
    271     { 32, 41, 20, 117, 151, 142, 20, 21, 163 },
    272     { 112, 19, 12, 61, 195, 128, 48, 4, 24 } }
    273 };
    274 
    275 static int PutI4Mode(VP8BitWriter* const bw, int mode,
    276                      const uint8_t* const prob) {
    277   if (VP8PutBit(bw, mode != B_DC_PRED, prob[0])) {
    278     if (VP8PutBit(bw, mode != B_TM_PRED, prob[1])) {
    279       if (VP8PutBit(bw, mode != B_VE_PRED, prob[2])) {
    280         if (!VP8PutBit(bw, mode >= B_LD_PRED, prob[3])) {
    281           if (VP8PutBit(bw, mode != B_HE_PRED, prob[4])) {
    282             VP8PutBit(bw, mode != B_RD_PRED, prob[5]);
    283           }
    284         } else {
    285           if (VP8PutBit(bw, mode != B_LD_PRED, prob[6])) {
    286             if (VP8PutBit(bw, mode != B_VL_PRED, prob[7])) {
    287               VP8PutBit(bw, mode != B_HD_PRED, prob[8]);
    288             }
    289           }
    290         }
    291       }
    292     }
    293   }
    294   return mode;
    295 }
    296 
    297 static void PutI16Mode(VP8BitWriter* const bw, int mode) {
    298   if (VP8PutBit(bw, (mode == TM_PRED || mode == H_PRED), 156)) {
    299     VP8PutBit(bw, mode == TM_PRED, 128);    // TM or HE
    300   } else {
    301     VP8PutBit(bw, mode == V_PRED, 163);     // VE or DC
    302   }
    303 }
    304 
    305 static void PutUVMode(VP8BitWriter* const bw, int uv_mode) {
    306   if (VP8PutBit(bw, uv_mode != DC_PRED, 142)) {
    307     if (VP8PutBit(bw, uv_mode != V_PRED, 114)) {
    308       VP8PutBit(bw, uv_mode != H_PRED, 183);    // else: TM_PRED
    309     }
    310   }
    311 }
    312 
    313 static void PutSegment(VP8BitWriter* const bw, int s, const uint8_t* p) {
    314   if (VP8PutBit(bw, s >= 2, p[0])) p += 1;
    315   VP8PutBit(bw, s & 1, p[1]);
    316 }
    317 
    318 void VP8CodeIntraModes(VP8Encoder* const enc) {
    319   VP8BitWriter* const bw = &enc->bw_;
    320   VP8EncIterator it;
    321   VP8IteratorInit(enc, &it);
    322   do {
    323     const VP8MBInfo* mb = it.mb_;
    324     const uint8_t* preds = it.preds_;
    325     if (enc->segment_hdr_.update_map_) {
    326       PutSegment(bw, mb->segment_, enc->proba_.segments_);
    327     }
    328     if (enc->proba_.use_skip_proba_) {
    329       VP8PutBit(bw, mb->skip_, enc->proba_.skip_proba_);
    330     }
    331     if (VP8PutBit(bw, (mb->type_ != 0), 145)) {  // i16x16
    332       PutI16Mode(bw, preds[0]);
    333     } else {
    334       const int preds_w = enc->preds_w_;
    335       const uint8_t* top_pred = preds - preds_w;
    336       int x, y;
    337       for (y = 0; y < 4; ++y) {
    338         int left = preds[-1];
    339         for (x = 0; x < 4; ++x) {
    340           const uint8_t* const probas = kBModesProba[top_pred[x]][left];
    341           left = PutI4Mode(bw, preds[x], probas);
    342         }
    343         top_pred = preds;
    344         preds += preds_w;
    345       }
    346     }
    347     PutUVMode(bw, mb->uv_mode_);
    348   } while (VP8IteratorNext(&it, 0));
    349 }
    350 
    351 //------------------------------------------------------------------------------
    352 // Paragraph 13
    353 
    354 const uint8_t
    355     VP8CoeffsUpdateProba[NUM_TYPES][NUM_BANDS][NUM_CTX][NUM_PROBAS] = {
    356   { { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
    357       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
    358       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    359     },
    360     { { 176, 246, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
    361       { 223, 241, 252, 255, 255, 255, 255, 255, 255, 255, 255 },
    362       { 249, 253, 253, 255, 255, 255, 255, 255, 255, 255, 255 }
    363     },
    364     { { 255, 244, 252, 255, 255, 255, 255, 255, 255, 255, 255 },
    365       { 234, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
    366       { 253, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    367     },
    368     { { 255, 246, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
    369       { 239, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
    370       { 254, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255 }
    371     },
    372     { { 255, 248, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
    373       { 251, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
    374       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    375     },
    376     { { 255, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
    377       { 251, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
    378       { 254, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255 }
    379     },
    380     { { 255, 254, 253, 255, 254, 255, 255, 255, 255, 255, 255 },
    381       { 250, 255, 254, 255, 254, 255, 255, 255, 255, 255, 255 },
    382       { 254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    383     },
    384     { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
    385       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
    386       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    387     }
    388   },
    389   { { { 217, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
    390       { 225, 252, 241, 253, 255, 255, 254, 255, 255, 255, 255 },
    391       { 234, 250, 241, 250, 253, 255, 253, 254, 255, 255, 255 }
    392     },
    393     { { 255, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
    394       { 223, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
    395       { 238, 253, 254, 254, 255, 255, 255, 255, 255, 255, 255 }
    396     },
    397     { { 255, 248, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
    398       { 249, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
    399       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    400     },
    401     { { 255, 253, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
    402       { 247, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
    403       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    404     },
    405     { { 255, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
    406       { 252, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
    407       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    408     },
    409     { { 255, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
    410       { 253, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
    411       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    412     },
    413     { { 255, 254, 253, 255, 255, 255, 255, 255, 255, 255, 255 },
    414       { 250, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
    415       { 254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    416     },
    417     { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
    418       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
    419       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    420     }
    421   },
    422   { { { 186, 251, 250, 255, 255, 255, 255, 255, 255, 255, 255 },
    423       { 234, 251, 244, 254, 255, 255, 255, 255, 255, 255, 255 },
    424       { 251, 251, 243, 253, 254, 255, 254, 255, 255, 255, 255 }
    425     },
    426     { { 255, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
    427       { 236, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
    428       { 251, 253, 253, 254, 254, 255, 255, 255, 255, 255, 255 }
    429     },
    430     { { 255, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
    431       { 254, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
    432       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    433     },
    434     { { 255, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
    435       { 254, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
    436       { 254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    437     },
    438     { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
    439       { 254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
    440       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    441     },
    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       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    445     },
    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       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    449     },
    450     { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
    451       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
    452       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    453     }
    454   },
    455   { { { 248, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
    456       { 250, 254, 252, 254, 255, 255, 255, 255, 255, 255, 255 },
    457       { 248, 254, 249, 253, 255, 255, 255, 255, 255, 255, 255 }
    458     },
    459     { { 255, 253, 253, 255, 255, 255, 255, 255, 255, 255, 255 },
    460       { 246, 253, 253, 255, 255, 255, 255, 255, 255, 255, 255 },
    461       { 252, 254, 251, 254, 254, 255, 255, 255, 255, 255, 255 }
    462     },
    463     { { 255, 254, 252, 255, 255, 255, 255, 255, 255, 255, 255 },
    464       { 248, 254, 253, 255, 255, 255, 255, 255, 255, 255, 255 },
    465       { 253, 255, 254, 254, 255, 255, 255, 255, 255, 255, 255 }
    466     },
    467     { { 255, 251, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
    468       { 245, 251, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
    469       { 253, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 }
    470     },
    471     { { 255, 251, 253, 255, 255, 255, 255, 255, 255, 255, 255 },
    472       { 252, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
    473       { 255, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    474     },
    475     { { 255, 252, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
    476       { 249, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
    477       { 255, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255 }
    478     },
    479     { { 255, 255, 253, 255, 255, 255, 255, 255, 255, 255, 255 },
    480       { 250, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
    481       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    482     },
    483     { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
    484       { 254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
    485       { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
    486     }
    487   }
    488 };
    489 
    490 void VP8WriteProbas(VP8BitWriter* const bw, const VP8Proba* const probas) {
    491   int t, b, c, p;
    492   for (t = 0; t < NUM_TYPES; ++t) {
    493     for (b = 0; b < NUM_BANDS; ++b) {
    494       for (c = 0; c < NUM_CTX; ++c) {
    495         for (p = 0; p < NUM_PROBAS; ++p) {
    496           const uint8_t p0 = probas->coeffs_[t][b][c][p];
    497           const int update = (p0 != VP8CoeffsProba0[t][b][c][p]);
    498           if (VP8PutBit(bw, update, VP8CoeffsUpdateProba[t][b][c][p])) {
    499             VP8PutValue(bw, p0, 8);
    500           }
    501         }
    502       }
    503     }
    504   }
    505   if (VP8PutBitUniform(bw, probas->use_skip_proba_)) {
    506     VP8PutValue(bw, probas->skip_proba_, 8);
    507   }
    508 }
    509 
    510 #if defined(__cplusplus) || defined(c_plusplus)
    511 }    // extern "C"
    512 #endif
    513