1 // Copyright 2010 Google Inc. All Rights Reserved.
2 //
3 // Use of this source code is governed by a BSD-style license
4 // that can be found in the COPYING file in the root of the source
5 // tree. An additional intellectual property rights grant can be found
6 // in the file PATENTS. All contributing project authors may
7 // be found in the AUTHORS file in the root of the source tree.
8 // -----------------------------------------------------------------------------
9 //
10 // Coding trees and probas
11 //
12 // Author: Skal (pascal.massimino@gmail.com)
13
14 #include "src/dec/vp8i_dec.h"
15 #include "src/utils/bit_reader_inl_utils.h"
16
17 #if !defined(USE_GENERIC_TREE)
18 #if !defined(__arm__) && !defined(_M_ARM) && !defined(__aarch64__)
19 // using a table is ~1-2% slower on ARM. Prefer the coded-tree approach then.
20 #define USE_GENERIC_TREE 1 // ALTERNATE_CODE
21 #else
22 #define USE_GENERIC_TREE 0
23 #endif
24 #endif // USE_GENERIC_TREE
25
26 #if (USE_GENERIC_TREE == 1)
27 static const int8_t kYModesIntra4[18] = {
28 -B_DC_PRED, 1,
29 -B_TM_PRED, 2,
30 -B_VE_PRED, 3,
31 4, 6,
32 -B_HE_PRED, 5,
33 -B_RD_PRED, -B_VR_PRED,
34 -B_LD_PRED, 7,
35 -B_VL_PRED, 8,
36 -B_HD_PRED, -B_HU_PRED
37 };
38 #endif
39
40 //------------------------------------------------------------------------------
41 // Default probabilities
42
43 // Paragraph 13.5
44 static const uint8_t
45 CoeffsProba0[NUM_TYPES][NUM_BANDS][NUM_CTX][NUM_PROBAS] = {
46 { { { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 },
47 { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 },
48 { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 }
49 },
50 { { 253, 136, 254, 255, 228, 219, 128, 128, 128, 128, 128 },
51 { 189, 129, 242, 255, 227, 213, 255, 219, 128, 128, 128 },
52 { 106, 126, 227, 252, 214, 209, 255, 255, 128, 128, 128 }
53 },
54 { { 1, 98, 248, 255, 236, 226, 255, 255, 128, 128, 128 },
55 { 181, 133, 238, 254, 221, 234, 255, 154, 128, 128, 128 },
56 { 78, 134, 202, 247, 198, 180, 255, 219, 128, 128, 128 },
57 },
58 { { 1, 185, 249, 255, 243, 255, 128, 128, 128, 128, 128 },
59 { 184, 150, 247, 255, 236, 224, 128, 128, 128, 128, 128 },
60 { 77, 110, 216, 255, 236, 230, 128, 128, 128, 128, 128 },
61 },
62 { { 1, 101, 251, 255, 241, 255, 128, 128, 128, 128, 128 },
63 { 170, 139, 241, 252, 236, 209, 255, 255, 128, 128, 128 },
64 { 37, 116, 196, 243, 228, 255, 255, 255, 128, 128, 128 }
65 },
66 { { 1, 204, 254, 255, 245, 255, 128, 128, 128, 128, 128 },
67 { 207, 160, 250, 255, 238, 128, 128, 128, 128, 128, 128 },
68 { 102, 103, 231, 255, 211, 171, 128, 128, 128, 128, 128 }
69 },
70 { { 1, 152, 252, 255, 240, 255, 128, 128, 128, 128, 128 },
71 { 177, 135, 243, 255, 234, 225, 128, 128, 128, 128, 128 },
72 { 80, 129, 211, 255, 194, 224, 128, 128, 128, 128, 128 }
73 },
74 { { 1, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 },
75 { 246, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 },
76 { 255, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 }
77 }
78 },
79 { { { 198, 35, 237, 223, 193, 187, 162, 160, 145, 155, 62 },
80 { 131, 45, 198, 221, 172, 176, 220, 157, 252, 221, 1 },
81 { 68, 47, 146, 208, 149, 167, 221, 162, 255, 223, 128 }
82 },
83 { { 1, 149, 241, 255, 221, 224, 255, 255, 128, 128, 128 },
84 { 184, 141, 234, 253, 222, 220, 255, 199, 128, 128, 128 },
85 { 81, 99, 181, 242, 176, 190, 249, 202, 255, 255, 128 }
86 },
87 { { 1, 129, 232, 253, 214, 197, 242, 196, 255, 255, 128 },
88 { 99, 121, 210, 250, 201, 198, 255, 202, 128, 128, 128 },
89 { 23, 91, 163, 242, 170, 187, 247, 210, 255, 255, 128 }
90 },
91 { { 1, 200, 246, 255, 234, 255, 128, 128, 128, 128, 128 },
92 { 109, 178, 241, 255, 231, 245, 255, 255, 128, 128, 128 },
93 { 44, 130, 201, 253, 205, 192, 255, 255, 128, 128, 128 }
94 },
95 { { 1, 132, 239, 251, 219, 209, 255, 165, 128, 128, 128 },
96 { 94, 136, 225, 251, 218, 190, 255, 255, 128, 128, 128 },
97 { 22, 100, 174, 245, 186, 161, 255, 199, 128, 128, 128 }
98 },
99 { { 1, 182, 249, 255, 232, 235, 128, 128, 128, 128, 128 },
100 { 124, 143, 241, 255, 227, 234, 128, 128, 128, 128, 128 },
101 { 35, 77, 181, 251, 193, 211, 255, 205, 128, 128, 128 }
102 },
103 { { 1, 157, 247, 255, 236, 231, 255, 255, 128, 128, 128 },
104 { 121, 141, 235, 255, 225, 227, 255, 255, 128, 128, 128 },
105 { 45, 99, 188, 251, 195, 217, 255, 224, 128, 128, 128 }
106 },
107 { { 1, 1, 251, 255, 213, 255, 128, 128, 128, 128, 128 },
108 { 203, 1, 248, 255, 255, 128, 128, 128, 128, 128, 128 },
109 { 137, 1, 177, 255, 224, 255, 128, 128, 128, 128, 128 }
110 }
111 },
112 { { { 253, 9, 248, 251, 207, 208, 255, 192, 128, 128, 128 },
113 { 175, 13, 224, 243, 193, 185, 249, 198, 255, 255, 128 },
114 { 73, 17, 171, 221, 161, 179, 236, 167, 255, 234, 128 }
115 },
116 { { 1, 95, 247, 253, 212, 183, 255, 255, 128, 128, 128 },
117 { 239, 90, 244, 250, 211, 209, 255, 255, 128, 128, 128 },
118 { 155, 77, 195, 248, 188, 195, 255, 255, 128, 128, 128 }
119 },
120 { { 1, 24, 239, 251, 218, 219, 255, 205, 128, 128, 128 },
121 { 201, 51, 219, 255, 196, 186, 128, 128, 128, 128, 128 },
122 { 69, 46, 190, 239, 201, 218, 255, 228, 128, 128, 128 }
123 },
124 { { 1, 191, 251, 255, 255, 128, 128, 128, 128, 128, 128 },
125 { 223, 165, 249, 255, 213, 255, 128, 128, 128, 128, 128 },
126 { 141, 124, 248, 255, 255, 128, 128, 128, 128, 128, 128 }
127 },
128 { { 1, 16, 248, 255, 255, 128, 128, 128, 128, 128, 128 },
129 { 190, 36, 230, 255, 236, 255, 128, 128, 128, 128, 128 },
130 { 149, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 }
131 },
132 { { 1, 226, 255, 128, 128, 128, 128, 128, 128, 128, 128 },
133 { 247, 192, 255, 128, 128, 128, 128, 128, 128, 128, 128 },
134 { 240, 128, 255, 128, 128, 128, 128, 128, 128, 128, 128 }
135 },
136 { { 1, 134, 252, 255, 255, 128, 128, 128, 128, 128, 128 },
137 { 213, 62, 250, 255, 255, 128, 128, 128, 128, 128, 128 },
138 { 55, 93, 255, 128, 128, 128, 128, 128, 128, 128, 128 }
139 },
140 { { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 },
141 { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 },
142 { 128, 128, 128, 128, 128, 128, 128, 128, 128, 128, 128 }
143 }
144 },
145 { { { 202, 24, 213, 235, 186, 191, 220, 160, 240, 175, 255 },
146 { 126, 38, 182, 232, 169, 184, 228, 174, 255, 187, 128 },
147 { 61, 46, 138, 219, 151, 178, 240, 170, 255, 216, 128 }
148 },
149 { { 1, 112, 230, 250, 199, 191, 247, 159, 255, 255, 128 },
150 { 166, 109, 228, 252, 211, 215, 255, 174, 128, 128, 128 },
151 { 39, 77, 162, 232, 172, 180, 245, 178, 255, 255, 128 }
152 },
153 { { 1, 52, 220, 246, 198, 199, 249, 220, 255, 255, 128 },
154 { 124, 74, 191, 243, 183, 193, 250, 221, 255, 255, 128 },
155 { 24, 71, 130, 219, 154, 170, 243, 182, 255, 255, 128 }
156 },
157 { { 1, 182, 225, 249, 219, 240, 255, 224, 128, 128, 128 },
158 { 149, 150, 226, 252, 216, 205, 255, 171, 128, 128, 128 },
159 { 28, 108, 170, 242, 183, 194, 254, 223, 255, 255, 128 }
160 },
161 { { 1, 81, 230, 252, 204, 203, 255, 192, 128, 128, 128 },
162 { 123, 102, 209, 247, 188, 196, 255, 233, 128, 128, 128 },
163 { 20, 95, 153, 243, 164, 173, 255, 203, 128, 128, 128 }
164 },
165 { { 1, 222, 248, 255, 216, 213, 128, 128, 128, 128, 128 },
166 { 168, 175, 246, 252, 235, 205, 255, 255, 128, 128, 128 },
167 { 47, 116, 215, 255, 211, 212, 255, 255, 128, 128, 128 }
168 },
169 { { 1, 121, 236, 253, 212, 214, 255, 255, 128, 128, 128 },
170 { 141, 84, 213, 252, 201, 202, 255, 219, 128, 128, 128 },
171 { 42, 80, 160, 240, 162, 185, 255, 205, 128, 128, 128 }
172 },
173 { { 1, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 },
174 { 244, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 },
175 { 238, 1, 255, 128, 128, 128, 128, 128, 128, 128, 128 }
176 }
177 }
178 };
179
180 // Paragraph 11.5
181 static const uint8_t kBModesProba[NUM_BMODES][NUM_BMODES][NUM_BMODES - 1] = {
182 { { 231, 120, 48, 89, 115, 113, 120, 152, 112 },
183 { 152, 179, 64, 126, 170, 118, 46, 70, 95 },
184 { 175, 69, 143, 80, 85, 82, 72, 155, 103 },
185 { 56, 58, 10, 171, 218, 189, 17, 13, 152 },
186 { 114, 26, 17, 163, 44, 195, 21, 10, 173 },
187 { 121, 24, 80, 195, 26, 62, 44, 64, 85 },
188 { 144, 71, 10, 38, 171, 213, 144, 34, 26 },
189 { 170, 46, 55, 19, 136, 160, 33, 206, 71 },
190 { 63, 20, 8, 114, 114, 208, 12, 9, 226 },
191 { 81, 40, 11, 96, 182, 84, 29, 16, 36 } },
192 { { 134, 183, 89, 137, 98, 101, 106, 165, 148 },
193 { 72, 187, 100, 130, 157, 111, 32, 75, 80 },
194 { 66, 102, 167, 99, 74, 62, 40, 234, 128 },
195 { 41, 53, 9, 178, 241, 141, 26, 8, 107 },
196 { 74, 43, 26, 146, 73, 166, 49, 23, 157 },
197 { 65, 38, 105, 160, 51, 52, 31, 115, 128 },
198 { 104, 79, 12, 27, 217, 255, 87, 17, 7 },
199 { 87, 68, 71, 44, 114, 51, 15, 186, 23 },
200 { 47, 41, 14, 110, 182, 183, 21, 17, 194 },
201 { 66, 45, 25, 102, 197, 189, 23, 18, 22 } },
202 { { 88, 88, 147, 150, 42, 46, 45, 196, 205 },
203 { 43, 97, 183, 117, 85, 38, 35, 179, 61 },
204 { 39, 53, 200, 87, 26, 21, 43, 232, 171 },
205 { 56, 34, 51, 104, 114, 102, 29, 93, 77 },
206 { 39, 28, 85, 171, 58, 165, 90, 98, 64 },
207 { 34, 22, 116, 206, 23, 34, 43, 166, 73 },
208 { 107, 54, 32, 26, 51, 1, 81, 43, 31 },
209 { 68, 25, 106, 22, 64, 171, 36, 225, 114 },
210 { 34, 19, 21, 102, 132, 188, 16, 76, 124 },
211 { 62, 18, 78, 95, 85, 57, 50, 48, 51 } },
212 { { 193, 101, 35, 159, 215, 111, 89, 46, 111 },
213 { 60, 148, 31, 172, 219, 228, 21, 18, 111 },
214 { 112, 113, 77, 85, 179, 255, 38, 120, 114 },
215 { 40, 42, 1, 196, 245, 209, 10, 25, 109 },
216 { 88, 43, 29, 140, 166, 213, 37, 43, 154 },
217 { 61, 63, 30, 155, 67, 45, 68, 1, 209 },
218 { 100, 80, 8, 43, 154, 1, 51, 26, 71 },
219 { 142, 78, 78, 16, 255, 128, 34, 197, 171 },
220 { 41, 40, 5, 102, 211, 183, 4, 1, 221 },
221 { 51, 50, 17, 168, 209, 192, 23, 25, 82 } },
222 { { 138, 31, 36, 171, 27, 166, 38, 44, 229 },
223 { 67, 87, 58, 169, 82, 115, 26, 59, 179 },
224 { 63, 59, 90, 180, 59, 166, 93, 73, 154 },
225 { 40, 40, 21, 116, 143, 209, 34, 39, 175 },
226 { 47, 15, 16, 183, 34, 223, 49, 45, 183 },
227 { 46, 17, 33, 183, 6, 98, 15, 32, 183 },
228 { 57, 46, 22, 24, 128, 1, 54, 17, 37 },
229 { 65, 32, 73, 115, 28, 128, 23, 128, 205 },
230 { 40, 3, 9, 115, 51, 192, 18, 6, 223 },
231 { 87, 37, 9, 115, 59, 77, 64, 21, 47 } },
232 { { 104, 55, 44, 218, 9, 54, 53, 130, 226 },
233 { 64, 90, 70, 205, 40, 41, 23, 26, 57 },
234 { 54, 57, 112, 184, 5, 41, 38, 166, 213 },
235 { 30, 34, 26, 133, 152, 116, 10, 32, 134 },
236 { 39, 19, 53, 221, 26, 114, 32, 73, 255 },
237 { 31, 9, 65, 234, 2, 15, 1, 118, 73 },
238 { 75, 32, 12, 51, 192, 255, 160, 43, 51 },
239 { 88, 31, 35, 67, 102, 85, 55, 186, 85 },
240 { 56, 21, 23, 111, 59, 205, 45, 37, 192 },
241 { 55, 38, 70, 124, 73, 102, 1, 34, 98 } },
242 { { 125, 98, 42, 88, 104, 85, 117, 175, 82 },
243 { 95, 84, 53, 89, 128, 100, 113, 101, 45 },
244 { 75, 79, 123, 47, 51, 128, 81, 171, 1 },
245 { 57, 17, 5, 71, 102, 57, 53, 41, 49 },
246 { 38, 33, 13, 121, 57, 73, 26, 1, 85 },
247 { 41, 10, 67, 138, 77, 110, 90, 47, 114 },
248 { 115, 21, 2, 10, 102, 255, 166, 23, 6 },
249 { 101, 29, 16, 10, 85, 128, 101, 196, 26 },
250 { 57, 18, 10, 102, 102, 213, 34, 20, 43 },
251 { 117, 20, 15, 36, 163, 128, 68, 1, 26 } },
252 { { 102, 61, 71, 37, 34, 53, 31, 243, 192 },
253 { 69, 60, 71, 38, 73, 119, 28, 222, 37 },
254 { 68, 45, 128, 34, 1, 47, 11, 245, 171 },
255 { 62, 17, 19, 70, 146, 85, 55, 62, 70 },
256 { 37, 43, 37, 154, 100, 163, 85, 160, 1 },
257 { 63, 9, 92, 136, 28, 64, 32, 201, 85 },
258 { 75, 15, 9, 9, 64, 255, 184, 119, 16 },
259 { 86, 6, 28, 5, 64, 255, 25, 248, 1 },
260 { 56, 8, 17, 132, 137, 255, 55, 116, 128 },
261 { 58, 15, 20, 82, 135, 57, 26, 121, 40 } },
262 { { 164, 50, 31, 137, 154, 133, 25, 35, 218 },
263 { 51, 103, 44, 131, 131, 123, 31, 6, 158 },
264 { 86, 40, 64, 135, 148, 224, 45, 183, 128 },
265 { 22, 26, 17, 131, 240, 154, 14, 1, 209 },
266 { 45, 16, 21, 91, 64, 222, 7, 1, 197 },
267 { 56, 21, 39, 155, 60, 138, 23, 102, 213 },
268 { 83, 12, 13, 54, 192, 255, 68, 47, 28 },
269 { 85, 26, 85, 85, 128, 128, 32, 146, 171 },
270 { 18, 11, 7, 63, 144, 171, 4, 4, 246 },
271 { 35, 27, 10, 146, 174, 171, 12, 26, 128 } },
272 { { 190, 80, 35, 99, 180, 80, 126, 54, 45 },
273 { 85, 126, 47, 87, 176, 51, 41, 20, 32 },
274 { 101, 75, 128, 139, 118, 146, 116, 128, 85 },
275 { 56, 41, 15, 176, 236, 85, 37, 9, 62 },
276 { 71, 30, 17, 119, 118, 255, 17, 18, 138 },
277 { 101, 38, 60, 138, 55, 70, 43, 26, 142 },
278 { 146, 36, 19, 30, 171, 255, 97, 27, 20 },
279 { 138, 45, 61, 62, 219, 1, 81, 188, 64 },
280 { 32, 41, 20, 117, 151, 142, 20, 21, 163 },
281 { 112, 19, 12, 61, 195, 128, 48, 4, 24 } }
282 };
283
VP8ResetProba(VP8Proba * const proba)284 void VP8ResetProba(VP8Proba* const proba) {
285 memset(proba->segments_, 255u, sizeof(proba->segments_));
286 // proba->bands_[][] is initialized later
287 }
288
ParseIntraMode(VP8BitReader * const br,VP8Decoder * const dec,int mb_x)289 static void ParseIntraMode(VP8BitReader* const br,
290 VP8Decoder* const dec, int mb_x) {
291 uint8_t* const top = dec->intra_t_ + 4 * mb_x;
292 uint8_t* const left = dec->intra_l_;
293 VP8MBData* const block = dec->mb_data_ + mb_x;
294
295 // Note: we don't save segment map (yet), as we don't expect
296 // to decode more than 1 keyframe.
297 if (dec->segment_hdr_.update_map_) {
298 // Hardcoded tree parsing
299 block->segment_ = !VP8GetBit(br, dec->proba_.segments_[0], "segments")
300 ? VP8GetBit(br, dec->proba_.segments_[1], "segments")
301 : VP8GetBit(br, dec->proba_.segments_[2], "segments") + 2;
302 } else {
303 block->segment_ = 0; // default for intra
304 }
305 if (dec->use_skip_proba_) block->skip_ = VP8GetBit(br, dec->skip_p_, "skip");
306
307 block->is_i4x4_ = !VP8GetBit(br, 145, "block-size");
308 if (!block->is_i4x4_) {
309 // Hardcoded 16x16 intra-mode decision tree.
310 const int ymode =
311 VP8GetBit(br, 156, "pred-modes") ?
312 (VP8GetBit(br, 128, "pred-modes") ? TM_PRED : H_PRED) :
313 (VP8GetBit(br, 163, "pred-modes") ? V_PRED : DC_PRED);
314 block->imodes_[0] = ymode;
315 memset(top, ymode, 4 * sizeof(*top));
316 memset(left, ymode, 4 * sizeof(*left));
317 } else {
318 uint8_t* modes = block->imodes_;
319 int y;
320 for (y = 0; y < 4; ++y) {
321 int ymode = left[y];
322 int x;
323 for (x = 0; x < 4; ++x) {
324 const uint8_t* const prob = kBModesProba[top[x]][ymode];
325 #if (USE_GENERIC_TREE == 1)
326 // Generic tree-parsing
327 int i = kYModesIntra4[VP8GetBit(br, prob[0], "pred-modes")];
328 while (i > 0) {
329 i = kYModesIntra4[2 * i + VP8GetBit(br, prob[i], "pred-modes")];
330 }
331 ymode = -i;
332 #else
333 // Hardcoded tree parsing
334 ymode = !VP8GetBit(br, prob[0], "pred-modes") ? B_DC_PRED :
335 !VP8GetBit(br, prob[1], "pred-modes") ? B_TM_PRED :
336 !VP8GetBit(br, prob[2], "pred-modes") ? B_VE_PRED :
337 !VP8GetBit(br, prob[3], "pred-modes") ?
338 (!VP8GetBit(br, prob[4], "pred-modes") ? B_HE_PRED :
339 (!VP8GetBit(br, prob[5], "pred-modes") ? B_RD_PRED
340 : B_VR_PRED)) :
341 (!VP8GetBit(br, prob[6], "pred-modes") ? B_LD_PRED :
342 (!VP8GetBit(br, prob[7], "pred-modes") ? B_VL_PRED :
343 (!VP8GetBit(br, prob[8], "pred-modes") ? B_HD_PRED
344 : B_HU_PRED))
345 );
346 #endif // USE_GENERIC_TREE
347 top[x] = ymode;
348 }
349 memcpy(modes, top, 4 * sizeof(*top));
350 modes += 4;
351 left[y] = ymode;
352 }
353 }
354 // Hardcoded UVMode decision tree
355 block->uvmode_ = !VP8GetBit(br, 142, "pred-modes-uv") ? DC_PRED
356 : !VP8GetBit(br, 114, "pred-modes-uv") ? V_PRED
357 : VP8GetBit(br, 183, "pred-modes-uv") ? TM_PRED : H_PRED;
358 }
359
VP8ParseIntraModeRow(VP8BitReader * const br,VP8Decoder * const dec)360 int VP8ParseIntraModeRow(VP8BitReader* const br, VP8Decoder* const dec) {
361 int mb_x;
362 for (mb_x = 0; mb_x < dec->mb_w_; ++mb_x) {
363 ParseIntraMode(br, dec, mb_x);
364 }
365 return !dec->br_.eof_;
366 }
367
368 //------------------------------------------------------------------------------
369 // Paragraph 13
370
371 static const uint8_t
372 CoeffsUpdateProba[NUM_TYPES][NUM_BANDS][NUM_CTX][NUM_PROBAS] = {
373 { { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
374 { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
375 { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
376 },
377 { { 176, 246, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
378 { 223, 241, 252, 255, 255, 255, 255, 255, 255, 255, 255 },
379 { 249, 253, 253, 255, 255, 255, 255, 255, 255, 255, 255 }
380 },
381 { { 255, 244, 252, 255, 255, 255, 255, 255, 255, 255, 255 },
382 { 234, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
383 { 253, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
384 },
385 { { 255, 246, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
386 { 239, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
387 { 254, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255 }
388 },
389 { { 255, 248, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
390 { 251, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
391 { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
392 },
393 { { 255, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
394 { 251, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
395 { 254, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255 }
396 },
397 { { 255, 254, 253, 255, 254, 255, 255, 255, 255, 255, 255 },
398 { 250, 255, 254, 255, 254, 255, 255, 255, 255, 255, 255 },
399 { 254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
400 },
401 { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
402 { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
403 { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
404 }
405 },
406 { { { 217, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
407 { 225, 252, 241, 253, 255, 255, 254, 255, 255, 255, 255 },
408 { 234, 250, 241, 250, 253, 255, 253, 254, 255, 255, 255 }
409 },
410 { { 255, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
411 { 223, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
412 { 238, 253, 254, 254, 255, 255, 255, 255, 255, 255, 255 }
413 },
414 { { 255, 248, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
415 { 249, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
416 { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
417 },
418 { { 255, 253, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
419 { 247, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
420 { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
421 },
422 { { 255, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
423 { 252, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
424 { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
425 },
426 { { 255, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
427 { 253, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
428 { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
429 },
430 { { 255, 254, 253, 255, 255, 255, 255, 255, 255, 255, 255 },
431 { 250, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
432 { 254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
433 },
434 { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
435 { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
436 { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
437 }
438 },
439 { { { 186, 251, 250, 255, 255, 255, 255, 255, 255, 255, 255 },
440 { 234, 251, 244, 254, 255, 255, 255, 255, 255, 255, 255 },
441 { 251, 251, 243, 253, 254, 255, 254, 255, 255, 255, 255 }
442 },
443 { { 255, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
444 { 236, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
445 { 251, 253, 253, 254, 254, 255, 255, 255, 255, 255, 255 }
446 },
447 { { 255, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
448 { 254, 254, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
449 { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
450 },
451 { { 255, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
452 { 254, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
453 { 254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
454 },
455 { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
456 { 254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
457 { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
458 },
459 { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
460 { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
461 { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
462 },
463 { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
464 { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
465 { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
466 },
467 { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
468 { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
469 { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
470 }
471 },
472 { { { 248, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
473 { 250, 254, 252, 254, 255, 255, 255, 255, 255, 255, 255 },
474 { 248, 254, 249, 253, 255, 255, 255, 255, 255, 255, 255 }
475 },
476 { { 255, 253, 253, 255, 255, 255, 255, 255, 255, 255, 255 },
477 { 246, 253, 253, 255, 255, 255, 255, 255, 255, 255, 255 },
478 { 252, 254, 251, 254, 254, 255, 255, 255, 255, 255, 255 }
479 },
480 { { 255, 254, 252, 255, 255, 255, 255, 255, 255, 255, 255 },
481 { 248, 254, 253, 255, 255, 255, 255, 255, 255, 255, 255 },
482 { 253, 255, 254, 254, 255, 255, 255, 255, 255, 255, 255 }
483 },
484 { { 255, 251, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
485 { 245, 251, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
486 { 253, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 }
487 },
488 { { 255, 251, 253, 255, 255, 255, 255, 255, 255, 255, 255 },
489 { 252, 253, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
490 { 255, 254, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
491 },
492 { { 255, 252, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
493 { 249, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255 },
494 { 255, 255, 254, 255, 255, 255, 255, 255, 255, 255, 255 }
495 },
496 { { 255, 255, 253, 255, 255, 255, 255, 255, 255, 255, 255 },
497 { 250, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
498 { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
499 },
500 { { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
501 { 254, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 },
502 { 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255 }
503 }
504 }
505 };
506
507 // Paragraph 9.9
508
509 static const uint8_t kBands[16 + 1] = {
510 0, 1, 2, 3, 6, 4, 5, 6, 6, 6, 6, 6, 6, 6, 6, 7,
511 0 // extra entry as sentinel
512 };
513
VP8ParseProba(VP8BitReader * const br,VP8Decoder * const dec)514 void VP8ParseProba(VP8BitReader* const br, VP8Decoder* const dec) {
515 VP8Proba* const proba = &dec->proba_;
516 int t, b, c, p;
517 for (t = 0; t < NUM_TYPES; ++t) {
518 for (b = 0; b < NUM_BANDS; ++b) {
519 for (c = 0; c < NUM_CTX; ++c) {
520 for (p = 0; p < NUM_PROBAS; ++p) {
521 const int v =
522 VP8GetBit(br, CoeffsUpdateProba[t][b][c][p], "global-header") ?
523 VP8GetValue(br, 8, "global-header") :
524 CoeffsProba0[t][b][c][p];
525 proba->bands_[t][b].probas_[c][p] = v;
526 }
527 }
528 }
529 for (b = 0; b < 16 + 1; ++b) {
530 proba->bands_ptr_[t][b] = &proba->bands_[t][kBands[b]];
531 }
532 }
533 dec->use_skip_proba_ = VP8Get(br, "global-header");
534 if (dec->use_skip_proba_) {
535 dec->skip_p_ = VP8GetValue(br, 8, "global-header");
536 }
537 }
538