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godotengine
GitHub Repository: godotengine/godot
 Path: blob/master/thirdparty/libwebp/src/dec/tree_dec.c
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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

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// tree. An additional intellectual property rights grant can be found

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// 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 ([email protected])

13


14
#include "src/dec/vp8i_dec.h"

15
#include "src/dsp/cpu.h"

16
#include "src/utils/bit_reader_inl_utils.h"

17


18
#if !defined(USE_GENERIC_TREE)

19
#if !defined(__arm__) && !defined(_M_ARM) && !WEBP_AARCH64 && \

20
    !defined(__wasm__)

21
// using a table is ~1-2% slower on ARM. Prefer the coded-tree approach then.

22
#define USE_GENERIC_TREE 1   // ALTERNATE_CODE

23
#else

24
#define USE_GENERIC_TREE 0

25
#endif

26
#endif  // USE_GENERIC_TREE

27


28
#if (USE_GENERIC_TREE == 1)

29
static const int8_t kYModesIntra4[18] = {

30
  -B_DC_PRED, 1,

31
    -B_TM_PRED, 2,

32
      -B_VE_PRED, 3,

33
        4, 6,

34
          -B_HE_PRED, 5,

35
            -B_RD_PRED, -B_VR_PRED,

36
        -B_LD_PRED, 7,

37
          -B_VL_PRED, 8,

38
            -B_HD_PRED, -B_HU_PRED

39
};

40
#endif

41


42
//------------------------------------------------------------------------------

43
// Default probabilities

44


45
// Paragraph 13.5

46
static const uint8_t

47
  CoeffsProba0[NUM_TYPES][NUM_BANDS][NUM_CTX][NUM_PROBAS] = {

48
  { { { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 },

49
      { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 },

50
      { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 }

51
    },

52
    { { 253, 136, 254, 255, 228, 219, 128, 128, 128, 128, 128 },

53
      { 189, 129, 242, 255, 227, 213, 255, 219, 128, 128, 128 },

54
      { 106, 126, 227, 252, 214, 209, 255, 255, 128, 128, 128 }

55
    },

56
    { { 1, 98, 248, 255, 236, 226, 255, 255, 128, 128, 128 },

57
      { 181, 133, 238, 254, 221, 234, 255, 154, 128, 128, 128 },

58
      { 78, 134, 202, 247, 198, 180, 255, 219, 128, 128, 128 },

59
    },

60
    { { 1, 185, 249, 255, 243, 255, 128, 128, 128, 128, 128 },

61
      { 184, 150, 247, 255, 236, 224, 128, 128, 128, 128, 128 },

62
      { 77, 110, 216, 255, 236, 230, 128, 128, 128, 128, 128 },

63
    },

64
    { { 1, 101, 251, 255, 241, 255, 128, 128, 128, 128, 128 },

65
      { 170, 139, 241, 252, 236, 209, 255, 255, 128, 128, 128 },

66
      { 37, 116, 196, 243, 228, 255, 255, 255, 128, 128, 128 }

67
    },

68
    { { 1, 204, 254, 255, 245, 255, 128, 128, 128, 128, 128 },

69
      { 207, 160, 250, 255, 238, 128, 128, 128, 128, 128, 128 },

70
      { 102, 103, 231, 255, 211, 171, 128, 128, 128, 128, 128 }

71
    },

72
    { { 1, 152, 252, 255, 240, 255, 128, 128, 128, 128, 128 },

73
      { 177, 135, 243, 255, 234, 225, 128, 128, 128, 128, 128 },

74
      { 80, 129, 211, 255, 194, 224, 128, 128, 128, 128, 128 }

75
    },

76
    { { 1, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 },

77
      { 246, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 },

78
      { 255, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 }

79
    }

80
  },

81
  { { { 198, 35, 237, 223, 193, 187, 162, 160, 145, 155, 62 },

82
      { 131, 45, 198, 221, 172, 176, 220, 157, 252, 221, 1 },

83
      { 68, 47, 146, 208, 149, 167, 221, 162, 255, 223, 128 }

84
    },

85
    { { 1, 149, 241, 255, 221, 224, 255, 255, 128, 128, 128 },

86
      { 184, 141, 234, 253, 222, 220, 255, 199, 128, 128, 128 },

87
      { 81, 99, 181, 242, 176, 190, 249, 202, 255, 255, 128 }

88
    },

89
    { { 1, 129, 232, 253, 214, 197, 242, 196, 255, 255, 128 },

90
      { 99, 121, 210, 250, 201, 198, 255, 202, 128, 128, 128 },

91
      { 23, 91, 163, 242, 170, 187, 247, 210, 255, 255, 128 }

92
    },

93
    { { 1, 200, 246, 255, 234, 255, 128, 128, 128, 128, 128 },

94
      { 109, 178, 241, 255, 231, 245, 255, 255, 128, 128, 128 },

95
      { 44, 130, 201, 253, 205, 192, 255, 255, 128, 128, 128 }

96
    },

97
    { { 1, 132, 239, 251, 219, 209, 255, 165, 128, 128, 128 },

98
      { 94, 136, 225, 251, 218, 190, 255, 255, 128, 128, 128 },

99
      { 22, 100, 174, 245, 186, 161, 255, 199, 128, 128, 128 }

100
    },

101
    { { 1, 182, 249, 255, 232, 235, 128, 128, 128, 128, 128 },

102
      { 124, 143, 241, 255, 227, 234, 128, 128, 128, 128, 128 },

103
      { 35, 77, 181, 251, 193, 211, 255, 205, 128, 128, 128 }

104
    },

105
    { { 1, 157, 247, 255, 236, 231, 255, 255, 128, 128, 128 },

106
      { 121, 141, 235, 255, 225, 227, 255, 255, 128, 128, 128 },

107
      { 45, 99, 188, 251, 195, 217, 255, 224, 128, 128, 128 }

108
    },

109
    { { 1, 1, 251, 255, 213, 255, 128, 128, 128, 128, 128 },

110
      { 203, 1, 248, 255, 255, 128, 128, 128, 128, 128, 128 },

111
      { 137, 1, 177, 255, 224, 255, 128, 128, 128, 128, 128 }

112
    }

113
  },

114
  { { { 253, 9, 248, 251, 207, 208, 255, 192, 128, 128, 128 },

115
      { 175, 13, 224, 243, 193, 185, 249, 198, 255, 255, 128 },

116
      { 73, 17, 171, 221, 161, 179, 236, 167, 255, 234, 128 }

117
    },

118
    { { 1, 95, 247, 253, 212, 183, 255, 255, 128, 128, 128 },

119
      { 239, 90, 244, 250, 211, 209, 255, 255, 128, 128, 128 },

120
      { 155, 77, 195, 248, 188, 195, 255, 255, 128, 128, 128 }

121
    },

122
    { { 1, 24, 239, 251, 218, 219, 255, 205, 128, 128, 128 },

123
      { 201, 51, 219, 255, 196, 186, 128, 128, 128, 128, 128 },

124
      { 69, 46, 190, 239, 201, 218, 255, 228, 128, 128, 128 }

125
    },

126
    { { 1, 191, 251, 255, 255, 128, 128, 128, 128, 128, 128 },

127
      { 223, 165, 249, 255, 213, 255, 128, 128, 128, 128, 128 },

128
      { 141, 124, 248, 255, 255, 128, 128, 128, 128, 128, 128 }

129
    },

130
    { { 1, 16, 248, 255, 255, 128, 128, 128, 128, 128, 128 },

131
      { 190, 36, 230, 255, 236, 255, 128, 128, 128, 128, 128 },

132
      { 149, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 }

133
    },

134
    { { 1, 226, 255, 128, 128, 128, 128, 128, 128, 128, 128 },

135
      { 247, 192, 255, 128, 128, 128, 128, 128, 128, 128, 128 },

136
      { 240, 128, 255, 128, 128, 128, 128, 128, 128, 128, 128 }

137
    },

138
    { { 1, 134, 252, 255, 255, 128, 128, 128, 128, 128, 128 },

139
      { 213, 62, 250, 255, 255, 128, 128, 128, 128, 128, 128 },

140
      { 55, 93, 255, 128, 128, 128, 128, 128, 128, 128, 128 }

141
    },

142
    { { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 },

143
      { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 },

144
      { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 }

145
    }

146
  },

147
  { { { 202, 24, 213, 235, 186, 191, 220, 160, 240, 175, 255 },

148
      { 126, 38, 182, 232, 169, 184, 228, 174, 255, 187, 128 },

149
      { 61, 46, 138, 219, 151, 178, 240, 170, 255, 216, 128 }

150
    },

151
    { { 1, 112, 230, 250, 199, 191, 247, 159, 255, 255, 128 },

152
      { 166, 109, 228, 252, 211, 215, 255, 174, 128, 128, 128 },

153
      { 39, 77, 162, 232, 172, 180, 245, 178, 255, 255, 128 }

154
    },

155
    { { 1, 52, 220, 246, 198, 199, 249, 220, 255, 255, 128 },

156
      { 124, 74, 191, 243, 183, 193, 250, 221, 255, 255, 128 },

157
      { 24, 71, 130, 219, 154, 170, 243, 182, 255, 255, 128 }

158
    },

159
    { { 1, 182, 225, 249, 219, 240, 255, 224, 128, 128, 128 },

160
      { 149, 150, 226, 252, 216, 205, 255, 171, 128, 128, 128 },

161
      { 28, 108, 170, 242, 183, 194, 254, 223, 255, 255, 128 }

162
    },

163
    { { 1, 81, 230, 252, 204, 203, 255, 192, 128, 128, 128 },

164
      { 123, 102, 209, 247, 188, 196, 255, 233, 128, 128, 128 },

165
      { 20, 95, 153, 243, 164, 173, 255, 203, 128, 128, 128 }

166
    },

167
    { { 1, 222, 248, 255, 216, 213, 128, 128, 128, 128, 128 },

168
      { 168, 175, 246, 252, 235, 205, 255, 255, 128, 128, 128 },

169
      { 47, 116, 215, 255, 211, 212, 255, 255, 128, 128, 128 }

170
    },

171
    { { 1, 121, 236, 253, 212, 214, 255, 255, 128, 128, 128 },

172
      { 141, 84, 213, 252, 201, 202, 255, 219, 128, 128, 128 },

173
      { 42, 80, 160, 240, 162, 185, 255, 205, 128, 128, 128 }

174
    },

175
    { { 1, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 },

176
      { 244, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 },

177
      { 238, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 }

178
    }

179
  }

180
};

181


182
// Paragraph 11.5

183
static const uint8_t kBModesProba[NUM_BMODES][NUM_BMODES][NUM_BMODES - 1] = {

184
  { { 231, 120, 48, 89, 115, 113, 120, 152, 112 },

185
    { 152, 179, 64, 126, 170, 118, 46, 70, 95 },

186
    { 175, 69, 143, 80, 85, 82, 72, 155, 103 },

187
    { 56, 58, 10, 171, 218, 189, 17, 13, 152 },

188
    { 114, 26, 17, 163, 44, 195, 21, 10, 173 },

189
    { 121, 24, 80, 195, 26, 62, 44, 64, 85 },

190
    { 144, 71, 10, 38, 171, 213, 144, 34, 26 },

191
    { 170, 46, 55, 19, 136, 160, 33, 206, 71 },

192
    { 63, 20, 8, 114, 114, 208, 12, 9, 226 },

193
    { 81, 40, 11, 96, 182, 84, 29, 16, 36 } },

194
  { { 134, 183, 89, 137, 98, 101, 106, 165, 148 },

195
    { 72, 187, 100, 130, 157, 111, 32, 75, 80 },

196
    { 66, 102, 167, 99, 74, 62, 40, 234, 128 },

197
    { 41, 53, 9, 178, 241, 141, 26, 8, 107 },

198
    { 74, 43, 26, 146, 73, 166, 49, 23, 157 },

199
    { 65, 38, 105, 160, 51, 52, 31, 115, 128 },

200
    { 104, 79, 12, 27, 217, 255, 87, 17, 7 },

201
    { 87, 68, 71, 44, 114, 51, 15, 186, 23 },

202
    { 47, 41, 14, 110, 182, 183, 21, 17, 194 },

203
    { 66, 45, 25, 102, 197, 189, 23, 18, 22 } },

204
  { { 88, 88, 147, 150, 42, 46, 45, 196, 205 },

205
    { 43, 97, 183, 117, 85, 38, 35, 179, 61 },

206
    { 39, 53, 200, 87, 26, 21, 43, 232, 171 },

207
    { 56, 34, 51, 104, 114, 102, 29, 93, 77 },

208
    { 39, 28, 85, 171, 58, 165, 90, 98, 64 },

209
    { 34, 22, 116, 206, 23, 34, 43, 166, 73 },

210
    { 107, 54, 32, 26, 51, 1, 81, 43, 31 },

211
    { 68, 25, 106, 22, 64, 171, 36, 225, 114 },

212
    { 34, 19, 21, 102, 132, 188, 16, 76, 124 },

213
    { 62, 18, 78, 95, 85, 57, 50, 48, 51 } },

214
  { { 193, 101, 35, 159, 215, 111, 89, 46, 111 },

215
    { 60, 148, 31, 172, 219, 228, 21, 18, 111 },

216
    { 112, 113, 77, 85, 179, 255, 38, 120, 114 },

217
    { 40, 42, 1, 196, 245, 209, 10, 25, 109 },

218
    { 88, 43, 29, 140, 166, 213, 37, 43, 154 },

219
    { 61, 63, 30, 155, 67, 45, 68, 1, 209 },

220
    { 100, 80, 8, 43, 154, 1, 51, 26, 71 },

221
    { 142, 78, 78, 16, 255, 128, 34, 197, 171 },

222
    { 41, 40, 5, 102, 211, 183, 4, 1, 221 },

223
    { 51, 50, 17, 168, 209, 192, 23, 25, 82 } },

224
  { { 138, 31, 36, 171, 27, 166, 38, 44, 229 },

225
    { 67, 87, 58, 169, 82, 115, 26, 59, 179 },

226
    { 63, 59, 90, 180, 59, 166, 93, 73, 154 },

227
    { 40, 40, 21, 116, 143, 209, 34, 39, 175 },

228
    { 47, 15, 16, 183, 34, 223, 49, 45, 183 },

229
    { 46, 17, 33, 183, 6, 98, 15, 32, 183 },

230
    { 57, 46, 22, 24, 128, 1, 54, 17, 37 },

231
    { 65, 32, 73, 115, 28, 128, 23, 128, 205 },

232
    { 40, 3, 9, 115, 51, 192, 18, 6, 223 },

233
    { 87, 37, 9, 115, 59, 77, 64, 21, 47 } },

234
  { { 104, 55, 44, 218, 9, 54, 53, 130, 226 },

235
    { 64, 90, 70, 205, 40, 41, 23, 26, 57 },

236
    { 54, 57, 112, 184, 5, 41, 38, 166, 213 },

237
    { 30, 34, 26, 133, 152, 116, 10, 32, 134 },

238
    { 39, 19, 53, 221, 26, 114, 32, 73, 255 },

239
    { 31, 9, 65, 234, 2, 15, 1, 118, 73 },

240
    { 75, 32, 12, 51, 192, 255, 160, 43, 51 },

241
    { 88, 31, 35, 67, 102, 85, 55, 186, 85 },

242
    { 56, 21, 23, 111, 59, 205, 45, 37, 192 },

243
    { 55, 38, 70, 124, 73, 102, 1, 34, 98 } },

244
  { { 125, 98, 42, 88, 104, 85, 117, 175, 82 },

245
    { 95, 84, 53, 89, 128, 100, 113, 101, 45 },

246
    { 75, 79, 123, 47, 51, 128, 81, 171, 1 },

247
    { 57, 17, 5, 71, 102, 57, 53, 41, 49 },

248
    { 38, 33, 13, 121, 57, 73, 26, 1, 85 },

249
    { 41, 10, 67, 138, 77, 110, 90, 47, 114 },

250
    { 115, 21, 2, 10, 102, 255, 166, 23, 6 },

251
    { 101, 29, 16, 10, 85, 128, 101, 196, 26 },

252
    { 57, 18, 10, 102, 102, 213, 34, 20, 43 },

253
    { 117, 20, 15, 36, 163, 128, 68, 1, 26 } },

254
  { { 102, 61, 71, 37, 34, 53, 31, 243, 192 },

255
    { 69, 60, 71, 38, 73, 119, 28, 222, 37 },

256
    { 68, 45, 128, 34, 1, 47, 11, 245, 171 },

257
    { 62, 17, 19, 70, 146, 85, 55, 62, 70 },

258
    { 37, 43, 37, 154, 100, 163, 85, 160, 1 },

259
    { 63, 9, 92, 136, 28, 64, 32, 201, 85 },

260
    { 75, 15, 9, 9, 64, 255, 184, 119, 16 },

261
    { 86, 6, 28, 5, 64, 255, 25, 248, 1 },

262
    { 56, 8, 17, 132, 137, 255, 55, 116, 128 },

263
    { 58, 15, 20, 82, 135, 57, 26, 121, 40 } },

264
  { { 164, 50, 31, 137, 154, 133, 25, 35, 218 },

265
    { 51, 103, 44, 131, 131, 123, 31, 6, 158 },

266
    { 86, 40, 64, 135, 148, 224, 45, 183, 128 },

267
    { 22, 26, 17, 131, 240, 154, 14, 1, 209 },

268
    { 45, 16, 21, 91, 64, 222, 7, 1, 197 },

269
    { 56, 21, 39, 155, 60, 138, 23, 102, 213 },

270
    { 83, 12, 13, 54, 192, 255, 68, 47, 28 },

271
    { 85, 26, 85, 85, 128, 128, 32, 146, 171 },

272
    { 18, 11, 7, 63, 144, 171, 4, 4, 246 },

273
    { 35, 27, 10, 146, 174, 171, 12, 26, 128 } },

274
  { { 190, 80, 35, 99, 180, 80, 126, 54, 45 },

275
    { 85, 126, 47, 87, 176, 51, 41, 20, 32 },

276
    { 101, 75, 128, 139, 118, 146, 116, 128, 85 },

277
    { 56, 41, 15, 176, 236, 85, 37, 9, 62 },

278
    { 71, 30, 17, 119, 118, 255, 17, 18, 138 },

279
    { 101, 38, 60, 138, 55, 70, 43, 26, 142 },

280
    { 146, 36, 19, 30, 171, 255, 97, 27, 20 },

281
    { 138, 45, 61, 62, 219, 1, 81, 188, 64 },

282
    { 32, 41, 20, 117, 151, 142, 20, 21, 163 },

283
    { 112, 19, 12, 61, 195, 128, 48, 4, 24 } }

284
};

285


286
void VP8ResetProba(VP8Proba* const proba) {

287
  memset(proba->segments_, 255u, sizeof(proba->segments_));

288
  // proba->bands_[][] is initialized later

289
}

290


291
static void ParseIntraMode(VP8BitReader* const br,

292
                           VP8Decoder* const dec, int mb_x) {

293
  uint8_t* const top = dec->intra_t_ + 4 * mb_x;

294
  uint8_t* const left = dec->intra_l_;

295
  VP8MBData* const block = dec->mb_data_ + mb_x;

296


297
  // Note: we don't save segment map (yet), as we don't expect

298
  // to decode more than 1 keyframe.

299
  if (dec->segment_hdr_.update_map_) {

300
    // Hardcoded tree parsing

301
    block->segment_ = !VP8GetBit(br, dec->proba_.segments_[0], "segments")

302
                    ?  VP8GetBit(br, dec->proba_.segments_[1], "segments")

303
                    :  VP8GetBit(br, dec->proba_.segments_[2], "segments") + 2;

304
  } else {

305
    block->segment_ = 0;  // default for intra

306
  }

307
  if (dec->use_skip_proba_) block->skip_ = VP8GetBit(br, dec->skip_p_, "skip");

308


309
  block->is_i4x4_ = !VP8GetBit(br, 145, "block-size");

310
  if (!block->is_i4x4_) {

311
    // Hardcoded 16x16 intra-mode decision tree.

312
    const int ymode =

313
        VP8GetBit(br, 156, "pred-modes") ?

314
            (VP8GetBit(br, 128, "pred-modes") ? TM_PRED : H_PRED) :

315
            (VP8GetBit(br, 163, "pred-modes") ? V_PRED : DC_PRED);

316
    block->imodes_[0] = ymode;

317
    memset(top, ymode, 4 * sizeof(*top));

318
    memset(left, ymode, 4 * sizeof(*left));

319
  } else {

320
    uint8_t* modes = block->imodes_;

321
    int y;

322
    for (y = 0; y < 4; ++y) {

323
      int ymode = left[y];

324
      int x;

325
      for (x = 0; x < 4; ++x) {

326
        const uint8_t* const prob = kBModesProba[top[x]][ymode];

327
#if (USE_GENERIC_TREE == 1)

328
        // Generic tree-parsing

329
        int i = kYModesIntra4[VP8GetBit(br, prob[0], "pred-modes")];

330
        while (i > 0) {

331
          i = kYModesIntra4[2 * i + VP8GetBit(br, prob[i], "pred-modes")];

332
        }

333
        ymode = -i;

334
#else

335
        // Hardcoded tree parsing

336
        ymode = !VP8GetBit(br, prob[0], "pred-modes") ? B_DC_PRED :

337
                  !VP8GetBit(br, prob[1], "pred-modes") ? B_TM_PRED :

338
                    !VP8GetBit(br, prob[2], "pred-modes") ? B_VE_PRED :

339
                      !VP8GetBit(br, prob[3], "pred-modes") ?

340
                        (!VP8GetBit(br, prob[4], "pred-modes") ? B_HE_PRED :

341
                          (!VP8GetBit(br, prob[5], "pred-modes") ? B_RD_PRED

342
                                                                 : B_VR_PRED)) :

343
                        (!VP8GetBit(br, prob[6], "pred-modes") ? B_LD_PRED :

344
                          (!VP8GetBit(br, prob[7], "pred-modes") ? B_VL_PRED :

345
                            (!VP8GetBit(br, prob[8], "pred-modes") ? B_HD_PRED

346
                                                                   : B_HU_PRED))

347
                        );

348
#endif  // USE_GENERIC_TREE

349
        top[x] = ymode;

350
      }

351
      memcpy(modes, top, 4 * sizeof(*top));

352
      modes += 4;

353
      left[y] = ymode;

354
    }

355
  }

356
  // Hardcoded UVMode decision tree

357
  block->uvmode_ = !VP8GetBit(br, 142, "pred-modes-uv") ? DC_PRED

358
                 : !VP8GetBit(br, 114, "pred-modes-uv") ? V_PRED

359
                 : VP8GetBit(br, 183, "pred-modes-uv") ? TM_PRED : H_PRED;

360
}

361


362
int VP8ParseIntraModeRow(VP8BitReader* const br, VP8Decoder* const dec) {

363
  int mb_x;

364
  for (mb_x = 0; mb_x < dec->mb_w_; ++mb_x) {

365
    ParseIntraMode(br, dec, mb_x);

366
  }

367
  return !dec->br_.eof_;

368
}

369


370
//------------------------------------------------------------------------------

371
// Paragraph 13

372


373
static const uint8_t

374
    CoeffsUpdateProba[NUM_TYPES][NUM_BANDS][NUM_CTX][NUM_PROBAS] = {

375
  { { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },

376
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },

377
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }

378
    },

379
    { { 176, 246, 255, 255, 255, 255, 255, 255, 255, 255, 255 },

380
      { 223, 241, 252, 255, 255, 255, 255, 255, 255, 255, 255 },

381
      { 249, 253, 253, 255, 255, 255, 255, 255, 255, 255, 255 }

382
    },

383
    { { 255, 244, 252, 255, 255, 255, 255, 255, 255, 255, 255 },

384
      { 234, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255 },

385
      { 253, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }

386
    },

387
    { { 255, 246, 254, 255, 255, 255, 255, 255, 255, 255, 255 },

388
      { 239, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 },

389
      { 254, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255 }

390
    },

391
    { { 255, 248, 254, 255, 255, 255, 255, 255, 255, 255, 255 },

392
      { 251, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255 },

393
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }

394
    },

395
    { { 255, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 },

396
      { 251, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255 },

397
      { 254, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255 }

398
    },

399
    { { 255, 254, 253, 255, 254, 255, 255, 255, 255, 255, 255 },

400
      { 250, 255, 254, 255, 254, 255, 255, 255, 255, 255, 255 },

401
      { 254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }

402
    },

403
    { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },

404
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },

405
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }

406
    }

407
  },

408
  { { { 217, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },

409
      { 225, 252, 241, 253, 255, 255, 254, 255, 255, 255, 255 },

410
      { 234, 250, 241, 250, 253, 255, 253, 254, 255, 255, 255 }

411
    },

412
    { { 255, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255 },

413
      { 223, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255 },

414
      { 238, 253, 254, 254, 255, 255, 255, 255, 255, 255, 255 }

415
    },

416
    { { 255, 248, 254, 255, 255, 255, 255, 255, 255, 255, 255 },

417
      { 249, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255 },

418
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }

419
    },

420
    { { 255, 253, 255, 255, 255, 255, 255, 255, 255, 255, 255 },

421
      { 247, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255 },

422
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }

423
    },

424
    { { 255, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 },

425
      { 252, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },

426
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }

427
    },

428
    { { 255, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255 },

429
      { 253, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },

430
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }

431
    },

432
    { { 255, 254, 253, 255, 255, 255, 255, 255, 255, 255, 255 },

433
      { 250, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },

434
      { 254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }

435
    },

436
    { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },

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
    }

440
  },

441
  { { { 186, 251, 250, 255, 255, 255, 255, 255, 255, 255, 255 },

442
      { 234, 251, 244, 254, 255, 255, 255, 255, 255, 255, 255 },

443
      { 251, 251, 243, 253, 254, 255, 254, 255, 255, 255, 255 }

444
    },

445
    { { 255, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 },

446
      { 236, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 },

447
      { 251, 253, 253, 254, 254, 255, 255, 255, 255, 255, 255 }

448
    },

449
    { { 255, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255 },

450
      { 254, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255 },

451
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }

452
    },

453
    { { 255, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255 },

454
      { 254, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255 },

455
      { 254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }

456
    },

457
    { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },

458
      { 254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },

459
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }

460
    },

461
    { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },

462
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },

463
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }

464
    },

465
    { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },

466
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },

467
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }

468
    },

469
    { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },

470
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },

471
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }

472
    }

473
  },

474
  { { { 248, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },

475
      { 250, 254, 252, 254, 255, 255, 255, 255, 255, 255, 255 },

476
      { 248, 254, 249, 253, 255, 255, 255, 255, 255, 255, 255 }

477
    },

478
    { { 255, 253, 253, 255, 255, 255, 255, 255, 255, 255, 255 },

479
      { 246, 253, 253, 255, 255, 255, 255, 255, 255, 255, 255 },

480
      { 252, 254, 251, 254, 254, 255, 255, 255, 255, 255, 255 }

481
    },

482
    { { 255, 254, 252, 255, 255, 255, 255, 255, 255, 255, 255 },

483
      { 248, 254, 253, 255, 255, 255, 255, 255, 255, 255, 255 },

484
      { 253, 255, 254, 254, 255, 255, 255, 255, 255, 255, 255 }

485
    },

486
    { { 255, 251, 254, 255, 255, 255, 255, 255, 255, 255, 255 },

487
      { 245, 251, 254, 255, 255, 255, 255, 255, 255, 255, 255 },

488
      { 253, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 }

489
    },

490
    { { 255, 251, 253, 255, 255, 255, 255, 255, 255, 255, 255 },

491
      { 252, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 },

492
      { 255, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255 }

493
    },

494
    { { 255, 252, 255, 255, 255, 255, 255, 255, 255, 255, 255 },

495
      { 249, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255 },

496
      { 255, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255 }

497
    },

498
    { { 255, 255, 253, 255, 255, 255, 255, 255, 255, 255, 255 },

499
      { 250, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },

500
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }

501
    },

502
    { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },

503
      { 254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },

504
      { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }

505
    }

506
  }

507
};

508


509
// Paragraph 9.9

510


511
static const uint8_t kBands[16 + 1] = {

512
  0, 1, 2, 3, 6, 4, 5, 6, 6, 6, 6, 6, 6, 6, 6, 7,

513
  0  // extra entry as sentinel

514
};

515


516
void VP8ParseProba(VP8BitReader* const br, VP8Decoder* const dec) {

517
  VP8Proba* const proba = &dec->proba_;

518
  int t, b, c, p;

519
  for (t = 0; t < NUM_TYPES; ++t) {

520
    for (b = 0; b < NUM_BANDS; ++b) {

521
      for (c = 0; c < NUM_CTX; ++c) {

522
        for (p = 0; p < NUM_PROBAS; ++p) {

523
          const int v =

524
              VP8GetBit(br, CoeffsUpdateProba[t][b][c][p], "global-header") ?

525
                        VP8GetValue(br, 8, "global-header") :

526
                        CoeffsProba0[t][b][c][p];

527
          proba->bands_[t][b].probas_[c][p] = v;

528
        }

529
      }

530
    }

531
    for (b = 0; b < 16 + 1; ++b) {

532
      proba->bands_ptr_[t][b] = &proba->bands_[t][kBands[b]];

533
    }

534
  }

535
  dec->use_skip_proba_ = VP8Get(br, "global-header");

536
  if (dec->use_skip_proba_) {

537
    dec->skip_p_ = VP8GetValue(br, 8, "global-header");

538
  }

539
}

540


541