1 /*****************************************************************************
2 * cabac.c: h264 encoder library
3 *****************************************************************************
4 * Copyright (C) 2003-2008 x264 project
6 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
7 * Loren Merritt <lorenm@u.washington.edu>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
22 *****************************************************************************/
27 static const int8_t x264_cabac_context_init_I[460][2] =
30 { 20, -15 }, { 2, 54 }, { 3, 74 }, { 20, -15 },
31 { 2, 54 }, { 3, 74 }, { -28,127 }, { -23, 104 },
32 { -6, 53 }, { -1, 54 }, { 7, 51 },
34 /* 11 - 23 unused for I */
35 { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 },
36 { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 },
37 { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 },
41 { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 },
42 { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 },
43 { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 },
44 { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 },
47 { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 },
48 { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 },
49 { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 },
53 { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 },
57 { 0, 41 }, { 0, 63 }, { 0, 63 }, { 0, 63 },
58 { -9, 83 }, { 4, 86 }, { 0, 97 }, { -7, 72 },
59 { 13, 41 }, { 3, 62 },
62 { 0, 11 }, { 1, 55 }, { 0, 69 }, { -17, 127 },
63 { -13, 102 },{ 0, 82 }, { -7, 74 }, { -21, 107 },
64 { -27, 127 },{ -31, 127 },{ -24, 127 }, { -18, 95 },
65 { -27, 127 },{ -21, 114 },{ -30, 127 }, { -17, 123 },
66 { -12, 115 },{ -16, 122 },
69 { -11, 115 },{ -12, 63 }, { -2, 68 }, { -15, 84 },
70 { -13, 104 },{ -3, 70 }, { -8, 93 }, { -10, 90 },
71 { -30, 127 },{ -1, 74 }, { -6, 97 }, { -7, 91 },
72 { -20, 127 },{ -4, 56 }, { -5, 82 }, { -7, 76 },
76 { -7, 93 }, { -11, 87 }, { -3, 77 }, { -5, 71 },
77 { -4, 63 }, { -4, 68 }, { -12, 84 }, { -7, 62 },
78 { -7, 65 }, { 8, 61 }, { 5, 56 }, { -2, 66 },
79 { 1, 64 }, { 0, 61 }, { -2, 78 }, { 1, 50 },
80 { 7, 52 }, { 10, 35 }, { 0, 44 }, { 11, 38 },
81 { 1, 45 }, { 0, 46 }, { 5, 44 }, { 31, 17 },
82 { 1, 51 }, { 7, 50 }, { 28, 19 }, { 16, 33 },
83 { 14, 62 }, { -13, 108 },{ -15, 100 },
86 { -13, 101 },{ -13, 91 }, { -12, 94 }, { -10, 88 },
87 { -16, 84 }, { -10, 86 }, { -7, 83 }, { -13, 87 },
88 { -19, 94 }, { 1, 70 }, { 0, 72 }, { -5, 74 },
89 { 18, 59 }, { -8, 102 }, { -15, 100 }, { 0, 95 },
90 { -4, 75 }, { 2, 72 }, { -11, 75 }, { -3, 71 },
91 { 15, 46 }, { -13, 69 }, { 0, 62 }, { 0, 65 },
92 { 21, 37 }, { -15, 72 }, { 9, 57 }, { 16, 54 },
93 { 0, 62 }, { 12, 72 },
96 { 24, 0 }, { 15, 9 }, { 8, 25 }, { 13, 18 },
97 { 15, 9 }, { 13, 19 }, { 10, 37 }, { 12, 18 },
98 { 6, 29 }, { 20, 33 }, { 15, 30 }, { 4, 45 },
99 { 1, 58 }, { 0, 62 }, { 7, 61 }, { 12, 38 },
100 { 11, 45 }, { 15, 39 }, { 11, 42 }, { 13, 44 },
101 { 16, 45 }, { 12, 41 }, { 10, 49 }, { 30, 34 },
102 { 18, 42 }, { 10, 55 }, { 17, 51 }, { 17, 46 },
103 { 0, 89 }, { 26, -19 }, { 22, -17 },
106 { 26, -17 }, { 30, -25 }, { 28, -20 }, { 33, -23 },
107 { 37, -27 }, { 33, -23 }, { 40, -28 }, { 38, -17 },
108 { 33, -11 }, { 40, -15 }, { 41, -6 }, { 38, 1 },
109 { 41, 17 }, { 30, -6 }, { 27, 3 }, { 26, 22 },
110 { 37, -16 }, { 35, -4 }, { 38, -8 }, { 38, -3 },
111 { 37, 3 }, { 38, 5 }, { 42, 0 }, { 35, 16 },
112 { 39, 22 }, { 14, 48 }, { 27, 37 }, { 21, 60 },
113 { 12, 68 }, { 2, 97 },
116 { -3, 71 }, { -6, 42 }, { -5, 50 }, { -3, 54 },
117 { -2, 62 }, { 0, 58 }, { 1, 63 }, { -2, 72 },
118 { -1, 74 }, { -9, 91 }, { -5, 67 }, { -5, 27 },
119 { -3, 39 }, { -2, 44 }, { 0, 46 }, { -16, 64 },
120 { -8, 68 }, { -10, 78 }, { -6, 77 }, { -10, 86 },
121 { -12, 92 }, { -15, 55 }, { -10, 60 }, { -6, 62 },
125 { -12, 73 }, { -8, 76 }, { -7, 80 }, { -9, 88 },
126 { -17, 110 },{ -11, 97 }, { -20, 84 }, { -11, 79 },
127 { -6, 73 }, { -4, 74 }, { -13, 86 }, { -13, 96 },
128 { -11, 97 }, { -19, 117 },{ -8, 78 }, { -5, 33 },
129 { -4, 48 }, { -2, 53 }, { -3, 62 }, { -13, 71 },
130 { -10, 79 }, { -12, 86 }, { -13, 90 }, { -14, 97 },
132 /* 276 a bit special (not used, x264_cabac_encode_bypass is used instead) */
136 { -6, 93 }, { -6, 84 }, { -8, 79 }, { 0, 66 },
137 { -1, 71 }, { 0, 62 }, { -2, 60 }, { -2, 59 },
138 { -5, 75 }, { -3, 62 }, { -4, 58 }, { -9, 66 },
139 { -1, 79 }, { 0, 71 }, { 3, 68 }, { 10, 44 },
140 { -7, 62 }, { 15, 36 }, { 14, 40 }, { 16, 27 },
141 { 12, 29 }, { 1, 44 }, { 20, 36 }, { 18, 32 },
142 { 5, 42 }, { 1, 48 }, { 10, 62 }, { 17, 46 },
143 { 9, 64 }, { -12, 104 },{ -11, 97 },
146 { -16, 96 }, { -7, 88 }, { -8, 85 }, { -7, 85 },
147 { -9, 85 }, { -13, 88 }, { 4, 66 }, { -3, 77 },
148 { -3, 76 }, { -6, 76 }, { 10, 58 }, { -1, 76 },
149 { -1, 83 }, { -7, 99 }, { -14, 95 }, { 2, 95 },
150 { 0, 76 }, { -5, 74 }, { 0, 70 }, { -11, 75 },
151 { 1, 68 }, { 0, 65 }, { -14, 73 }, { 3, 62 },
152 { 4, 62 }, { -1, 68 }, { -13, 75 }, { 11, 55 },
153 { 5, 64 }, { 12, 70 },
156 { 15, 6 }, { 6, 19 }, { 7, 16 }, { 12, 14 },
157 { 18, 13 }, { 13, 11 }, { 13, 15 }, { 15, 16 },
158 { 12, 23 }, { 13, 23 }, { 15, 20 }, { 14, 26 },
159 { 14, 44 }, { 17, 40 }, { 17, 47 }, { 24, 17 },
160 { 21, 21 }, { 25, 22 }, { 31, 27 }, { 22, 29 },
161 { 19, 35 }, { 14, 50 }, { 10, 57 }, { 7, 63 },
162 { -2, 77 }, { -4, 82 }, { -3, 94 }, { 9, 69 },
163 { -12, 109 },{ 36, -35 }, { 36, -34 },
166 { 32, -26 }, { 37, -30 }, { 44, -32 }, { 34, -18 },
167 { 34, -15 }, { 40, -15 }, { 33, -7 }, { 35, -5 },
168 { 33, 0 }, { 38, 2 }, { 33, 13 }, { 23, 35 },
169 { 13, 58 }, { 29, -3 }, { 26, 0 }, { 22, 30 },
170 { 31, -7 }, { 35, -15 }, { 34, -3 }, { 34, 3 },
171 { 36, -1 }, { 34, 5 }, { 32, 11 }, { 35, 5 },
172 { 34, 12 }, { 39, 11 }, { 30, 29 }, { 34, 26 },
173 { 29, 39 }, { 19, 66 },
176 { 31, 21 }, { 31, 31 }, { 25, 50 },
177 { -17, 120 }, { -20, 112 }, { -18, 114 }, { -11, 85 },
178 { -15, 92 }, { -14, 89 }, { -26, 71 }, { -15, 81 },
179 { -14, 80 }, { 0, 68 }, { -14, 70 }, { -24, 56 },
180 { -23, 68 }, { -24, 50 }, { -11, 74 }, { 23, -13 },
181 { 26, -13 }, { 40, -15 }, { 49, -14 }, { 44, 3 },
182 { 45, 6 }, { 44, 34 }, { 33, 54 }, { 19, 82 },
183 { -3, 75 }, { -1, 23 }, { 1, 34 }, { 1, 43 },
184 { 0, 54 }, { -2, 55 }, { 0, 61 }, { 1, 64 },
185 { 0, 68 }, { -9, 92 },
188 { -14, 106 }, { -13, 97 }, { -15, 90 }, { -12, 90 },
189 { -18, 88 }, { -10, 73 }, { -9, 79 }, { -14, 86 },
190 { -10, 73 }, { -10, 70 }, { -10, 69 }, { -5, 66 },
191 { -9, 64 }, { -5, 58 }, { 2, 59 }, { 21, -10 },
192 { 24, -11 }, { 28, -8 }, { 28, -1 }, { 29, 3 },
193 { 29, 9 }, { 35, 20 }, { 29, 36 }, { 14, 67 }
196 static const int8_t x264_cabac_context_init_PB[3][460][2] =
198 /* i_cabac_init_idc == 0 */
201 { 20, -15 }, { 2, 54 }, { 3, 74 }, { 20, -15 },
202 { 2, 54 }, { 3, 74 }, { -28, 127 }, { -23, 104 },
203 { -6, 53 }, { -1, 54 }, { 7, 51 },
206 { 23, 33 }, { 23, 2 }, { 21, 0 }, { 1, 9 },
207 { 0, 49 }, { -37, 118 }, { 5, 57 }, { -13, 78 },
208 { -11, 65 }, { 1, 62 }, { 12, 49 }, { -4, 73 },
212 { 18, 64 }, { 9, 43 }, { 29, 0 }, { 26, 67 },
213 { 16, 90 }, { 9, 104 }, { -46, 127 }, { -20, 104 },
214 { 1, 67 }, { -13, 78 }, { -11, 65 }, { 1, 62 },
215 { -6, 86 }, { -17, 95 }, { -6, 61 }, { 9, 45 },
218 { -3, 69 }, { -6, 81 }, { -11, 96 }, { 6, 55 },
219 { 7, 67 }, { -5, 86 }, { 2, 88 }, { 0, 58 },
220 { -3, 76 }, { -10, 94 }, { 5, 54 }, { 4, 69 },
221 { -3, 81 }, { 0, 88 },
224 { -7, 67 }, { -5, 74 }, { -4, 74 }, { -5, 80 },
225 { -7, 72 }, { 1, 58 },
228 { 0, 41 }, { 0, 63 }, { 0, 63 }, { 0, 63 },
229 { -9, 83 }, { 4, 86 }, { 0, 97 }, { -7, 72 },
230 { 13, 41 }, { 3, 62 },
233 { 0, 45 }, { -4, 78 }, { -3, 96 }, { -27, 126 },
234 { -28, 98 }, { -25, 101 }, { -23, 67 }, { -28, 82 },
235 { -20, 94 }, { -16, 83 }, { -22, 110 }, { -21, 91 },
236 { -18, 102 }, { -13, 93 }, { -29, 127 }, { -7, 92 },
237 { -5, 89 }, { -7, 96 }, { -13, 108 }, { -3, 46 },
238 { -1, 65 }, { -1, 57 }, { -9, 93 }, { -3, 74 },
239 { -9, 92 }, { -8, 87 }, { -23, 126 }, { 5, 54 },
240 { 6, 60 }, { 6, 59 }, { 6, 69 }, { -1, 48 },
241 { 0, 68 }, { -4, 69 }, { -8, 88 },
244 { -2, 85 }, { -6, 78 }, { -1, 75 }, { -7, 77 },
245 { 2, 54 }, { 5, 50 }, { -3, 68 }, { 1, 50 },
246 { 6, 42 }, { -4, 81 }, { 1, 63 }, { -4, 70 },
247 { 0, 67 }, { 2, 57 }, { -2, 76 }, { 11, 35 },
248 { 4, 64 }, { 1, 61 }, { 11, 35 }, { 18, 25 },
249 { 12, 24 }, { 13, 29 }, { 13, 36 }, { -10, 93 },
250 { -7, 73 }, { -2, 73 }, { 13, 46 }, { 9, 49 },
251 { -7, 100 }, { 9, 53 }, { 2, 53 }, { 5, 53 },
252 { -2, 61 }, { 0, 56 }, { 0, 56 }, { -13, 63 },
253 { -5, 60 }, { -1, 62 }, { 4, 57 }, { -6, 69 },
254 { 4, 57 }, { 14, 39 }, { 4, 51 }, { 13, 68 },
255 { 3, 64 }, { 1, 61 }, { 9, 63 }, { 7, 50 },
256 { 16, 39 }, { 5, 44 }, { 4, 52 }, { 11, 48 },
257 { -5, 60 }, { -1, 59 }, { 0, 59 }, { 22, 33 },
258 { 5, 44 }, { 14, 43 }, { -1, 78 }, { 0, 60 },
262 { 11, 28 }, { 2, 40 }, { 3, 44 }, { 0, 49 },
263 { 0, 46 }, { 2, 44 }, { 2, 51 }, { 0, 47 },
264 { 4, 39 }, { 2, 62 }, { 6, 46 }, { 0, 54 },
265 { 3, 54 }, { 2, 58 }, { 4, 63 }, { 6, 51 },
266 { 6, 57 }, { 7, 53 }, { 6, 52 }, { 6, 55 },
267 { 11, 45 }, { 14, 36 }, { 8, 53 }, { -1, 82 },
268 { 7, 55 }, { -3, 78 }, { 15, 46 }, { 22, 31 },
269 { -1, 84 }, { 25, 7 }, { 30, -7 }, { 28, 3 },
270 { 28, 4 }, { 32, 0 }, { 34, -1 }, { 30, 6 },
271 { 30, 6 }, { 32, 9 }, { 31, 19 }, { 26, 27 },
272 { 26, 30 }, { 37, 20 }, { 28, 34 }, { 17, 70 },
273 { 1, 67 }, { 5, 59 }, { 9, 67 }, { 16, 30 },
274 { 18, 32 }, { 18, 35 }, { 22, 29 }, { 24, 31 },
275 { 23, 38 }, { 18, 43 }, { 20, 41 }, { 11, 63 },
276 { 9, 59 }, { 9, 64 }, { -1, 94 }, { -2, 89 },
280 { -6, 76 }, { -2, 44 }, { 0, 45 }, { 0, 52 },
281 { -3, 64 }, { -2, 59 }, { -4, 70 }, { -4, 75 },
282 { -8, 82 }, { -17, 102 }, { -9, 77 }, { 3, 24 },
283 { 0, 42 }, { 0, 48 }, { 0, 55 }, { -6, 59 },
284 { -7, 71 }, { -12, 83 }, { -11, 87 }, { -30, 119 },
285 { 1, 58 }, { -3, 29 }, { -1, 36 }, { 1, 38 },
286 { 2, 43 }, { -6, 55 }, { 0, 58 }, { 0, 64 },
287 { -3, 74 }, { -10, 90 }, { 0, 70 }, { -4, 29 },
288 { 5, 31 }, { 7, 42 }, { 1, 59 }, { -2, 58 },
289 { -3, 72 }, { -3, 81 }, { -11, 97 }, { 0, 58 },
290 { 8, 5 }, { 10, 14 }, { 14, 18 }, { 13, 27 },
291 { 2, 40 }, { 0, 58 }, { -3, 70 }, { -6, 79 },
294 /* 276 a bit special (not used, x264_cabac_encode_bypass is used instead) */
298 { -13, 106 }, { -16, 106 }, { -10, 87 }, { -21, 114 },
299 { -18, 110 }, { -14, 98 }, { -22, 110 }, { -21, 106 },
300 { -18, 103 }, { -21, 107 }, { -23, 108 }, { -26, 112 },
301 { -10, 96 }, { -12, 95 }, { -5, 91 }, { -9, 93 },
302 { -22, 94 }, { -5, 86 }, { 9, 67 }, { -4, 80 },
303 { -10, 85 }, { -1, 70 }, { 7, 60 }, { 9, 58 },
304 { 5, 61 }, { 12, 50 }, { 15, 50 }, { 18, 49 },
305 { 17, 54 }, { 10, 41 }, { 7, 46 }, { -1, 51 },
306 { 7, 49 }, { 8, 52 }, { 9, 41 }, { 6, 47 },
307 { 2, 55 }, { 13, 41 }, { 10, 44 }, { 6, 50 },
308 { 5, 53 }, { 13, 49 }, { 4, 63 }, { 6, 64 },
309 { -2, 69 }, { -2, 59 }, { 6, 70 }, { 10, 44 },
310 { 9, 31 }, { 12, 43 }, { 3, 53 }, { 14, 34 },
311 { 10, 38 }, { -3, 52 }, { 13, 40 }, { 17, 32 },
312 { 7, 44 }, { 7, 38 }, { 13, 50 }, { 10, 57 },
316 { 14, 11 }, { 11, 14 }, { 9, 11 }, { 18, 11 },
317 { 21, 9 }, { 23, -2 }, { 32, -15 }, { 32, -15 },
318 { 34, -21 }, { 39, -23 }, { 42, -33 }, { 41, -31 },
319 { 46, -28 }, { 38, -12 }, { 21, 29 }, { 45, -24 },
320 { 53, -45 }, { 48, -26 }, { 65, -43 }, { 43, -19 },
321 { 39, -10 }, { 30, 9 }, { 18, 26 }, { 20, 27 },
322 { 0, 57 }, { -14, 82 }, { -5, 75 }, { -19, 97 },
323 { -35, 125 }, { 27, 0 }, { 28, 0 }, { 31, -4 },
324 { 27, 6 }, { 34, 8 }, { 30, 10 }, { 24, 22 },
325 { 33, 19 }, { 22, 32 }, { 26, 31 }, { 21, 41 },
326 { 26, 44 }, { 23, 47 }, { 16, 65 }, { 14, 71 },
327 { 8, 60 }, { 6, 63 }, { 17, 65 }, { 21, 24 },
328 { 23, 20 }, { 26, 23 }, { 27, 32 }, { 28, 23 },
329 { 28, 24 }, { 23, 40 }, { 24, 32 }, { 28, 29 },
330 { 23, 42 }, { 19, 57 }, { 22, 53 }, { 22, 61 },
334 { 12, 40 }, { 11, 51 }, { 14, 59 },
335 { -4, 79 }, { -7, 71 }, { -5, 69 }, { -9, 70 },
336 { -8, 66 }, { -10, 68 }, { -19, 73 }, { -12, 69 },
337 { -16, 70 }, { -15, 67 }, { -20, 62 }, { -19, 70 },
338 { -16, 66 }, { -22, 65 }, { -20, 63 }, { 9, -2 },
339 { 26, -9 }, { 33, -9 }, { 39, -7 }, { 41, -2 },
340 { 45, 3 }, { 49, 9 }, { 45, 27 }, { 36, 59 },
341 { -6, 66 }, { -7, 35 }, { -7, 42 }, { -8, 45 },
342 { -5, 48 }, { -12, 56 }, { -6, 60 }, { -5, 62 },
343 { -8, 66 }, { -8, 76 },
346 { -5, 85 }, { -6, 81 }, { -10, 77 }, { -7, 81 },
347 { -17, 80 }, { -18, 73 }, { -4, 74 }, { -10, 83 },
348 { -9, 71 }, { -9, 67 }, { -1, 61 }, { -8, 66 },
349 { -14, 66 }, { 0, 59 }, { 2, 59 }, { 21, -13 },
350 { 33, -14 }, { 39, -7 }, { 46, -2 }, { 51, 2 },
351 { 60, 6 }, { 61, 17 }, { 55, 34 }, { 42, 62 },
354 /* i_cabac_init_idc == 1 */
357 { 20, -15 }, { 2, 54 }, { 3, 74 }, { 20, -15 },
358 { 2, 54 }, { 3, 74 }, { -28, 127 }, { -23, 104 },
359 { -6, 53 }, { -1, 54 }, { 7, 51 },
362 { 22, 25 }, { 34, 0 }, { 16, 0 }, { -2, 9 },
363 { 4, 41 }, { -29, 118 }, { 2, 65 }, { -6, 71 },
364 { -13, 79 }, { 5, 52 }, { 9, 50 }, { -3, 70 },
368 { 26, 34 }, { 19, 22 }, { 40, 0 }, { 57, 2 },
369 { 41, 36 }, { 26, 69 }, { -45, 127 }, { -15, 101 },
370 { -4, 76 }, { -6, 71 }, { -13, 79 }, { 5, 52 },
371 { 6, 69 }, { -13, 90 }, { 0, 52 }, { 8, 43 },
374 { -2, 69 },{ -5, 82 },{ -10, 96 },{ 2, 59 },
375 { 2, 75 },{ -3, 87 },{ -3, 100 },{ 1, 56 },
376 { -3, 74 },{ -6, 85 },{ 0, 59 },{ -3, 81 },
377 { -7, 86 },{ -5, 95 },
380 { -1, 66 },{ -1, 77 },{ 1, 70 },{ -2, 86 },
381 { -5, 72 },{ 0, 61 },
384 { 0, 41 }, { 0, 63 }, { 0, 63 }, { 0, 63 },
385 { -9, 83 }, { 4, 86 }, { 0, 97 }, { -7, 72 },
386 { 13, 41 }, { 3, 62 },
389 { 13, 15 }, { 7, 51 }, { 2, 80 }, { -39, 127 },
390 { -18, 91 }, { -17, 96 }, { -26, 81 }, { -35, 98 },
391 { -24, 102 }, { -23, 97 }, { -27, 119 }, { -24, 99 },
392 { -21, 110 }, { -18, 102 }, { -36, 127 }, { 0, 80 },
393 { -5, 89 }, { -7, 94 }, { -4, 92 }, { 0, 39 },
394 { 0, 65 }, { -15, 84 }, { -35, 127 }, { -2, 73 },
395 { -12, 104 }, { -9, 91 }, { -31, 127 }, { 3, 55 },
396 { 7, 56 }, { 7, 55 }, { 8, 61 }, { -3, 53 },
397 { 0, 68 }, { -7, 74 }, { -9, 88 },
400 { -13, 103 }, { -13, 91 }, { -9, 89 }, { -14, 92 },
401 { -8, 76 }, { -12, 87 }, { -23, 110 }, { -24, 105 },
402 { -10, 78 }, { -20, 112 }, { -17, 99 }, { -78, 127 },
403 { -70, 127 }, { -50, 127 }, { -46, 127 }, { -4, 66 },
404 { -5, 78 }, { -4, 71 }, { -8, 72 }, { 2, 59 },
405 { -1, 55 }, { -7, 70 }, { -6, 75 }, { -8, 89 },
406 { -34, 119 }, { -3, 75 }, { 32, 20 }, { 30, 22 },
407 { -44, 127 }, { 0, 54 }, { -5, 61 }, { 0, 58 },
408 { -1, 60 }, { -3, 61 }, { -8, 67 }, { -25, 84 },
409 { -14, 74 }, { -5, 65 }, { 5, 52 }, { 2, 57 },
410 { 0, 61 }, { -9, 69 }, { -11, 70 }, { 18, 55 },
411 { -4, 71 }, { 0, 58 }, { 7, 61 }, { 9, 41 },
412 { 18, 25 }, { 9, 32 }, { 5, 43 }, { 9, 47 },
413 { 0, 44 }, { 0, 51 }, { 2, 46 }, { 19, 38 },
414 { -4, 66 }, { 15, 38 }, { 12, 42 }, { 9, 34 },
418 { 4, 45 }, { 10, 28 }, { 10, 31 }, { 33, -11 },
419 { 52, -43 }, { 18, 15 }, { 28, 0 }, { 35, -22 },
420 { 38, -25 }, { 34, 0 }, { 39, -18 }, { 32, -12 },
421 { 102, -94 }, { 0, 0 }, { 56, -15 }, { 33, -4 },
422 { 29, 10 }, { 37, -5 }, { 51, -29 }, { 39, -9 },
423 { 52, -34 }, { 69, -58 }, { 67, -63 }, { 44, -5 },
424 { 32, 7 }, { 55, -29 }, { 32, 1 }, { 0, 0 },
425 { 27, 36 }, { 33, -25 }, { 34, -30 }, { 36, -28 },
426 { 38, -28 }, { 38, -27 }, { 34, -18 }, { 35, -16 },
427 { 34, -14 }, { 32, -8 }, { 37, -6 }, { 35, 0 },
428 { 30, 10 }, { 28, 18 }, { 26, 25 }, { 29, 41 },
429 { 0, 75 }, { 2, 72 }, { 8, 77 }, { 14, 35 },
430 { 18, 31 }, { 17, 35 }, { 21, 30 }, { 17, 45 },
431 { 20, 42 }, { 18, 45 }, { 27, 26 }, { 16, 54 },
432 { 7, 66 }, { 16, 56 }, { 11, 73 }, { 10, 67 },
436 { -23, 112 }, { -15, 71 }, { -7, 61 }, { 0, 53 },
437 { -5, 66 }, { -11, 77 }, { -9, 80 }, { -9, 84 },
438 { -10, 87 }, { -34, 127 }, { -21, 101 }, { -3, 39 },
439 { -5, 53 }, { -7, 61 }, { -11, 75 }, { -15, 77 },
440 { -17, 91 }, { -25, 107 }, { -25, 111 }, { -28, 122 },
441 { -11, 76 }, { -10, 44 }, { -10, 52 }, { -10, 57 },
442 { -9, 58 }, { -16, 72 }, { -7, 69 }, { -4, 69 },
443 { -5, 74 }, { -9, 86 }, { 2, 66 }, { -9, 34 },
444 { 1, 32 }, { 11, 31 }, { 5, 52 }, { -2, 55 },
445 { -2, 67 }, { 0, 73 }, { -8, 89 }, { 3, 52 },
446 { 7, 4 }, { 10, 8 }, { 17, 8 }, { 16, 19 },
447 { 3, 37 }, { -1, 61 }, { -5, 73 }, { -1, 70 },
450 /* 276 a bit special (not used, x264_cabac_encode_bypass is used instead) */
454 { -21, 126 }, { -23, 124 }, { -20, 110 }, { -26, 126 },
455 { -25, 124 }, { -17, 105 }, { -27, 121 }, { -27, 117 },
456 { -17, 102 }, { -26, 117 }, { -27, 116 }, { -33, 122 },
457 { -10, 95 }, { -14, 100 }, { -8, 95 }, { -17, 111 },
458 { -28, 114 }, { -6, 89 }, { -2, 80 }, { -4, 82 },
459 { -9, 85 }, { -8, 81 }, { -1, 72 }, { 5, 64 },
460 { 1, 67 }, { 9, 56 }, { 0, 69 }, { 1, 69 },
461 { 7, 69 }, { -7, 69 }, { -6, 67 }, { -16, 77 },
462 { -2, 64 }, { 2, 61 }, { -6, 67 }, { -3, 64 },
463 { 2, 57 }, { -3, 65 }, { -3, 66 }, { 0, 62 },
464 { 9, 51 }, { -1, 66 }, { -2, 71 }, { -2, 75 },
465 { -1, 70 }, { -9, 72 }, { 14, 60 }, { 16, 37 },
466 { 0, 47 }, { 18, 35 }, { 11, 37 }, { 12, 41 },
467 { 10, 41 }, { 2, 48 }, { 12, 41 }, { 13, 41 },
468 { 0, 59 }, { 3, 50 }, { 19, 40 }, { 3, 66 },
472 { 19, -6 }, { 18, -6 }, { 14, 0 }, { 26, -12 },
473 { 31, -16 }, { 33, -25 }, { 33, -22 }, { 37, -28 },
474 { 39, -30 }, { 42, -30 }, { 47, -42 }, { 45, -36 },
475 { 49, -34 }, { 41, -17 }, { 32, 9 }, { 69, -71 },
476 { 63, -63 }, { 66, -64 }, { 77, -74 }, { 54, -39 },
477 { 52, -35 }, { 41, -10 }, { 36, 0 }, { 40, -1 },
478 { 30, 14 }, { 28, 26 }, { 23, 37 }, { 12, 55 },
479 { 11, 65 }, { 37, -33 }, { 39, -36 }, { 40, -37 },
480 { 38, -30 }, { 46, -33 }, { 42, -30 }, { 40, -24 },
481 { 49, -29 }, { 38, -12 }, { 40, -10 }, { 38, -3 },
482 { 46, -5 }, { 31, 20 }, { 29, 30 }, { 25, 44 },
483 { 12, 48 }, { 11, 49 }, { 26, 45 }, { 22, 22 },
484 { 23, 22 }, { 27, 21 }, { 33, 20 }, { 26, 28 },
485 { 30, 24 }, { 27, 34 }, { 18, 42 }, { 25, 39 },
486 { 18, 50 }, { 12, 70 }, { 21, 54 }, { 14, 71 },
490 { 25, 32 }, { 21, 49 }, { 21, 54 },
491 { -5, 85 }, { -6, 81 }, { -10, 77 }, { -7, 81 },
492 { -17, 80 }, { -18, 73 }, { -4, 74 }, { -10, 83 },
493 { -9, 71 }, { -9, 67 }, { -1, 61 }, { -8, 66 },
494 { -14, 66 }, { 0, 59 }, { 2, 59 }, { 17, -10 },
495 { 32, -13 }, { 42, -9 }, { 49, -5 }, { 53, 0 },
496 { 64, 3 }, { 68, 10 }, { 66, 27 }, { 47, 57 },
497 { -5, 71 }, { 0, 24 }, { -1, 36 }, { -2, 42 },
498 { -2, 52 }, { -9, 57 }, { -6, 63 }, { -4, 65 },
499 { -4, 67 }, { -7, 82 },
502 { -3, 81 }, { -3, 76 }, { -7, 72 }, { -6, 78 },
503 { -12, 72 }, { -14, 68 }, { -3, 70 }, { -6, 76 },
504 { -5, 66 }, { -5, 62 }, { 0, 57 }, { -4, 61 },
505 { -9, 60 }, { 1, 54 }, { 2, 58 }, { 17, -10 },
506 { 32, -13 }, { 42, -9 }, { 49, -5 }, { 53, 0 },
507 { 64, 3 }, { 68, 10 }, { 66, 27 }, { 47, 57 },
510 /* i_cabac_init_idc == 2 */
513 { 20, -15 }, { 2, 54 }, { 3, 74 }, { 20, -15 },
514 { 2, 54 }, { 3, 74 }, { -28, 127 }, { -23, 104 },
515 { -6, 53 }, { -1, 54 }, { 7, 51 },
518 { 29, 16 }, { 25, 0 }, { 14, 0 }, { -10, 51 },
519 { -3, 62 }, { -27, 99 }, { 26, 16 }, { -4, 85 },
520 { -24, 102 }, { 5, 57 }, { 6, 57 }, { -17, 73 },
524 { 20, 40 }, { 20, 10 }, { 29, 0 }, { 54, 0 },
525 { 37, 42 }, { 12, 97 }, { -32, 127 }, { -22, 117 },
526 { -2, 74 }, { -4, 85 }, { -24, 102 }, { 5, 57 },
527 { -6, 93 }, { -14, 88 }, { -6, 44 }, { 4, 55 },
530 { -11, 89 },{ -15, 103 },{ -21, 116 },{ 19, 57 },
531 { 20, 58 },{ 4, 84 },{ 6, 96 },{ 1, 63 },
532 { -5, 85 },{ -13, 106 },{ 5, 63 },{ 6, 75 },
533 { -3, 90 },{ -1, 101 },
536 { 3, 55 },{ -4, 79 },{ -2, 75 },{ -12, 97 },
537 { -7, 50 },{ 1, 60 },
540 { 0, 41 }, { 0, 63 }, { 0, 63 }, { 0, 63 },
541 { -9, 83 }, { 4, 86 }, { 0, 97 }, { -7, 72 },
542 { 13, 41 }, { 3, 62 },
545 { 7, 34 }, { -9, 88 }, { -20, 127 }, { -36, 127 },
546 { -17, 91 }, { -14, 95 }, { -25, 84 }, { -25, 86 },
547 { -12, 89 }, { -17, 91 }, { -31, 127 }, { -14, 76 },
548 { -18, 103 }, { -13, 90 }, { -37, 127 }, { 11, 80 },
549 { 5, 76 }, { 2, 84 }, { 5, 78 }, { -6, 55 },
550 { 4, 61 }, { -14, 83 }, { -37, 127 }, { -5, 79 },
551 { -11, 104 }, { -11, 91 }, { -30, 127 }, { 0, 65 },
552 { -2, 79 }, { 0, 72 }, { -4, 92 }, { -6, 56 },
553 { 3, 68 }, { -8, 71 }, { -13, 98 },
556 { -4, 86 }, { -12, 88 }, { -5, 82 }, { -3, 72 },
557 { -4, 67 }, { -8, 72 }, { -16, 89 }, { -9, 69 },
558 { -1, 59 }, { 5, 66 }, { 4, 57 }, { -4, 71 },
559 { -2, 71 }, { 2, 58 }, { -1, 74 }, { -4, 44 },
560 { -1, 69 }, { 0, 62 }, { -7, 51 }, { -4, 47 },
561 { -6, 42 }, { -3, 41 }, { -6, 53 }, { 8, 76 },
562 { -9, 78 }, { -11, 83 }, { 9, 52 }, { 0, 67 },
563 { -5, 90 }, { 1, 67 }, { -15, 72 }, { -5, 75 },
564 { -8, 80 }, { -21, 83 }, { -21, 64 }, { -13, 31 },
565 { -25, 64 }, { -29, 94 }, { 9, 75 }, { 17, 63 },
566 { -8, 74 }, { -5, 35 }, { -2, 27 }, { 13, 91 },
567 { 3, 65 }, { -7, 69 }, { 8, 77 }, { -10, 66 },
568 { 3, 62 }, { -3, 68 }, { -20, 81 }, { 0, 30 },
569 { 1, 7 }, { -3, 23 }, { -21, 74 }, { 16, 66 },
570 { -23, 124 }, { 17, 37 }, { 44, -18 }, { 50, -34 },
574 { 4, 39 }, { 0, 42 }, { 7, 34 }, { 11, 29 },
575 { 8, 31 }, { 6, 37 }, { 7, 42 }, { 3, 40 },
576 { 8, 33 }, { 13, 43 }, { 13, 36 }, { 4, 47 },
577 { 3, 55 }, { 2, 58 }, { 6, 60 }, { 8, 44 },
578 { 11, 44 }, { 14, 42 }, { 7, 48 }, { 4, 56 },
579 { 4, 52 }, { 13, 37 }, { 9, 49 }, { 19, 58 },
580 { 10, 48 }, { 12, 45 }, { 0, 69 }, { 20, 33 },
581 { 8, 63 }, { 35, -18 }, { 33, -25 }, { 28, -3 },
582 { 24, 10 }, { 27, 0 }, { 34, -14 }, { 52, -44 },
583 { 39, -24 }, { 19, 17 }, { 31, 25 }, { 36, 29 },
584 { 24, 33 }, { 34, 15 }, { 30, 20 }, { 22, 73 },
585 { 20, 34 }, { 19, 31 }, { 27, 44 }, { 19, 16 },
586 { 15, 36 }, { 15, 36 }, { 21, 28 }, { 25, 21 },
587 { 30, 20 }, { 31, 12 }, { 27, 16 }, { 24, 42 },
588 { 0, 93 }, { 14, 56 }, { 15, 57 }, { 26, 38 },
592 { -24, 115 }, { -22, 82 }, { -9, 62 }, { 0, 53 },
593 { 0, 59 }, { -14, 85 }, { -13, 89 }, { -13, 94 },
594 { -11, 92 }, { -29, 127 }, { -21, 100 }, { -14, 57 },
595 { -12, 67 }, { -11, 71 }, { -10, 77 }, { -21, 85 },
596 { -16, 88 }, { -23, 104 }, { -15, 98 }, { -37, 127 },
597 { -10, 82 }, { -8, 48 }, { -8, 61 }, { -8, 66 },
598 { -7, 70 }, { -14, 75 }, { -10, 79 }, { -9, 83 },
599 { -12, 92 }, { -18, 108 }, { -4, 79 }, { -22, 69 },
600 { -16, 75 }, { -2, 58 }, { 1, 58 }, { -13, 78 },
601 { -9, 83 }, { -4, 81 }, { -13, 99 }, { -13, 81 },
602 { -6, 38 }, { -13, 62 }, { -6, 58 }, { -2, 59 },
603 { -16, 73 }, { -10, 76 }, { -13, 86 }, { -9, 83 },
606 /* 276 a bit special (not used, x264_cabac_encode_bypass is used instead) */
610 { -22, 127 }, { -25, 127 }, { -25, 120 }, { -27, 127 },
611 { -19, 114 }, { -23, 117 }, { -25, 118 }, { -26, 117 },
612 { -24, 113 }, { -28, 118 }, { -31, 120 }, { -37, 124 },
613 { -10, 94 }, { -15, 102 }, { -10, 99 }, { -13, 106 },
614 { -50, 127 }, { -5, 92 }, { 17, 57 }, { -5, 86 },
615 { -13, 94 }, { -12, 91 }, { -2, 77 }, { 0, 71 },
616 { -1, 73 }, { 4, 64 }, { -7, 81 }, { 5, 64 },
617 { 15, 57 }, { 1, 67 }, { 0, 68 }, { -10, 67 },
618 { 1, 68 }, { 0, 77 }, { 2, 64 }, { 0, 68 },
619 { -5, 78 }, { 7, 55 }, { 5, 59 }, { 2, 65 },
620 { 14, 54 }, { 15, 44 }, { 5, 60 }, { 2, 70 },
621 { -2, 76 }, { -18, 86 }, { 12, 70 }, { 5, 64 },
622 { -12, 70 }, { 11, 55 }, { 5, 56 }, { 0, 69 },
623 { 2, 65 }, { -6, 74 }, { 5, 54 }, { 7, 54 },
624 { -6, 76 }, { -11, 82 }, { -2, 77 }, { -2, 77 },
628 { 17, -13 }, { 16, -9 }, { 17, -12 }, { 27, -21 },
629 { 37, -30 }, { 41, -40 }, { 42, -41 }, { 48, -47 },
630 { 39, -32 }, { 46, -40 }, { 52, -51 }, { 46, -41 },
631 { 52, -39 }, { 43, -19 }, { 32, 11 }, { 61, -55 },
632 { 56, -46 }, { 62, -50 }, { 81, -67 }, { 45, -20 },
633 { 35, -2 }, { 28, 15 }, { 34, 1 }, { 39, 1 },
634 { 30, 17 }, { 20, 38 }, { 18, 45 }, { 15, 54 },
635 { 0, 79 }, { 36, -16 }, { 37, -14 }, { 37, -17 },
636 { 32, 1 }, { 34, 15 }, { 29, 15 }, { 24, 25 },
637 { 34, 22 }, { 31, 16 }, { 35, 18 }, { 31, 28 },
638 { 33, 41 }, { 36, 28 }, { 27, 47 }, { 21, 62 },
639 { 18, 31 }, { 19, 26 }, { 36, 24 }, { 24, 23 },
640 { 27, 16 }, { 24, 30 }, { 31, 29 }, { 22, 41 },
641 { 22, 42 }, { 16, 60 }, { 15, 52 }, { 14, 60 },
642 { 3, 78 }, { -16, 123 }, { 21, 53 }, { 22, 56 },
646 { 21, 33 }, { 19, 50 }, { 17, 61 },
647 { -3, 78 }, { -8, 74 }, { -9, 72 }, { -10, 72 },
648 { -18, 75 }, { -12, 71 }, { -11, 63 }, { -5, 70 },
649 { -17, 75 }, { -14, 72 }, { -16, 67 }, { -8, 53 },
650 { -14, 59 }, { -9, 52 }, { -11, 68 }, { 9, -2 },
651 { 30, -10 }, { 31, -4 }, { 33, -1 }, { 33, 7 },
652 { 31, 12 }, { 37, 23 }, { 31, 38 }, { 20, 64 },
653 { -9, 71 }, { -7, 37 }, { -8, 44 }, { -11, 49 },
654 { -10, 56 }, { -12, 59 }, { -8, 63 }, { -9, 67 },
655 { -6, 68 }, { -10, 79 },
658 { -3, 78 }, { -8, 74 }, { -9, 72 }, { -10, 72 },
659 { -18, 75 }, { -12, 71 }, { -11, 63 }, { -5, 70 },
660 { -17, 75 }, { -14, 72 }, { -16, 67 }, { -8, 53 },
661 { -14, 59 }, { -9, 52 }, { -11, 68 }, { 9, -2 },
662 { 30, -10 }, { 31, -4 }, { 33, -1 }, { 33, 7 },
663 { 31, 12 }, { 37, 23 }, { 31, 38 }, { 20, 64 },
667 const uint8_t x264_cabac_range_lps[64][4] =
669 { 2, 2, 2, 2}, { 6, 7, 8, 9}, { 6, 7, 9, 10}, { 6, 8, 9, 11},
670 { 7, 8, 10, 11}, { 7, 9, 10, 12}, { 7, 9, 11, 12}, { 8, 9, 11, 13},
671 { 8, 10, 12, 14}, { 9, 11, 12, 14}, { 9, 11, 13, 15}, { 10, 12, 14, 16},
672 { 10, 12, 15, 17}, { 11, 13, 15, 18}, { 11, 14, 16, 19}, { 12, 14, 17, 20},
673 { 12, 15, 18, 21}, { 13, 16, 19, 22}, { 14, 17, 20, 23}, { 14, 18, 21, 24},
674 { 15, 19, 22, 25}, { 16, 20, 23, 27}, { 17, 21, 25, 28}, { 18, 22, 26, 30},
675 { 19, 23, 27, 31}, { 20, 24, 29, 33}, { 21, 26, 30, 35}, { 22, 27, 32, 37},
676 { 23, 28, 33, 39}, { 24, 30, 35, 41}, { 26, 31, 37, 43}, { 27, 33, 39, 45},
677 { 29, 35, 41, 48}, { 30, 37, 43, 50}, { 32, 39, 46, 53}, { 33, 41, 48, 56},
678 { 35, 43, 51, 59}, { 37, 45, 54, 62}, { 39, 48, 56, 65}, { 41, 50, 59, 69},
679 { 43, 53, 63, 72}, { 46, 56, 66, 76}, { 48, 59, 69, 80}, { 51, 62, 73, 85},
680 { 53, 65, 77, 89}, { 56, 69, 81, 94}, { 59, 72, 86, 99}, { 62, 76, 90, 104},
681 { 66, 80, 95, 110}, { 69, 85, 100, 116}, { 73, 89, 105, 122}, { 77, 94, 111, 128},
682 { 81, 99, 117, 135}, { 85, 104, 123, 142}, { 90, 110, 130, 150}, { 95, 116, 137, 158},
683 {100, 122, 144, 166}, {105, 128, 152, 175}, {111, 135, 160, 185}, {116, 142, 169, 195},
684 {123, 150, 178, 205}, {128, 158, 187, 216}, {128, 167, 197, 227}, {128, 176, 208, 240}
687 const uint8_t x264_cabac_transition[128][2] =
689 { 0, 0}, { 1, 1}, { 2, 50}, { 51, 3}, { 2, 50}, { 51, 3}, { 4, 52}, { 53, 5},
690 { 6, 52}, { 53, 7}, { 8, 52}, { 53, 9}, { 10, 54}, { 55, 11}, { 12, 54}, { 55, 13},
691 { 14, 54}, { 55, 15}, { 16, 56}, { 57, 17}, { 18, 56}, { 57, 19}, { 20, 56}, { 57, 21},
692 { 22, 58}, { 59, 23}, { 24, 58}, { 59, 25}, { 26, 60}, { 61, 27}, { 28, 60}, { 61, 29},
693 { 30, 60}, { 61, 31}, { 32, 62}, { 63, 33}, { 34, 62}, { 63, 35}, { 36, 64}, { 65, 37},
694 { 38, 66}, { 67, 39}, { 40, 66}, { 67, 41}, { 42, 66}, { 67, 43}, { 44, 68}, { 69, 45},
695 { 46, 68}, { 69, 47}, { 48, 70}, { 71, 49}, { 50, 72}, { 73, 51}, { 52, 72}, { 73, 53},
696 { 54, 74}, { 75, 55}, { 56, 74}, { 75, 57}, { 58, 76}, { 77, 59}, { 60, 78}, { 79, 61},
697 { 62, 78}, { 79, 63}, { 64, 80}, { 81, 65}, { 66, 82}, { 83, 67}, { 68, 82}, { 83, 69},
698 { 70, 84}, { 85, 71}, { 72, 84}, { 85, 73}, { 74, 88}, { 89, 75}, { 76, 88}, { 89, 77},
699 { 78, 90}, { 91, 79}, { 80, 90}, { 91, 81}, { 82, 94}, { 95, 83}, { 84, 94}, { 95, 85},
700 { 86, 96}, { 97, 87}, { 88, 96}, { 97, 89}, { 90, 100}, {101, 91}, { 92, 100}, {101, 93},
701 { 94, 102}, {103, 95}, { 96, 104}, {105, 97}, { 98, 104}, {105, 99}, {100, 108}, {109, 101},
702 {102, 108}, {109, 103}, {104, 110}, {111, 105}, {106, 112}, {113, 107}, {108, 114}, {115, 109},
703 {110, 116}, {117, 111}, {112, 118}, {119, 113}, {114, 118}, {119, 115}, {116, 122}, {123, 117},
704 {118, 122}, {123, 119}, {120, 124}, {125, 121}, {122, 126}, {127, 123}, {124, 127}, {126, 125}
707 const uint8_t x264_cabac_renorm_shift[64]= {
708 6,5,4,4,3,3,3,3,2,2,2,2,2,2,2,2,
709 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
710 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
711 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
714 /* -ln2(probability) */
715 const uint16_t x264_cabac_entropy[128] =
717 FIX8(0.0273), FIX8(5.7370), FIX8(0.0288), FIX8(5.6618),
718 FIX8(0.0303), FIX8(5.5866), FIX8(0.0320), FIX8(5.5114),
719 FIX8(0.0337), FIX8(5.4362), FIX8(0.0355), FIX8(5.3610),
720 FIX8(0.0375), FIX8(5.2859), FIX8(0.0395), FIX8(5.2106),
721 FIX8(0.0416), FIX8(5.1354), FIX8(0.0439), FIX8(5.0602),
722 FIX8(0.0463), FIX8(4.9851), FIX8(0.0488), FIX8(4.9099),
723 FIX8(0.0515), FIX8(4.8347), FIX8(0.0543), FIX8(4.7595),
724 FIX8(0.0572), FIX8(4.6843), FIX8(0.0604), FIX8(4.6091),
725 FIX8(0.0637), FIX8(4.5339), FIX8(0.0671), FIX8(4.4588),
726 FIX8(0.0708), FIX8(4.3836), FIX8(0.0747), FIX8(4.3083),
727 FIX8(0.0788), FIX8(4.2332), FIX8(0.0832), FIX8(4.1580),
728 FIX8(0.0878), FIX8(4.0828), FIX8(0.0926), FIX8(4.0076),
729 FIX8(0.0977), FIX8(3.9324), FIX8(0.1032), FIX8(3.8572),
730 FIX8(0.1089), FIX8(3.7820), FIX8(0.1149), FIX8(3.7068),
731 FIX8(0.1214), FIX8(3.6316), FIX8(0.1282), FIX8(3.5565),
732 FIX8(0.1353), FIX8(3.4813), FIX8(0.1429), FIX8(3.4061),
733 FIX8(0.1510), FIX8(3.3309), FIX8(0.1596), FIX8(3.2557),
734 FIX8(0.1686), FIX8(3.1805), FIX8(0.1782), FIX8(3.1053),
735 FIX8(0.1884), FIX8(3.0301), FIX8(0.1992), FIX8(2.9549),
736 FIX8(0.2107), FIX8(2.8797), FIX8(0.2229), FIX8(2.8046),
737 FIX8(0.2358), FIX8(2.7294), FIX8(0.2496), FIX8(2.6542),
738 FIX8(0.2642), FIX8(2.5790), FIX8(0.2798), FIX8(2.5038),
739 FIX8(0.2964), FIX8(2.4286), FIX8(0.3142), FIX8(2.3534),
740 FIX8(0.3331), FIX8(2.2782), FIX8(0.3532), FIX8(2.2030),
741 FIX8(0.3748), FIX8(2.1278), FIX8(0.3979), FIX8(2.0527),
742 FIX8(0.4226), FIX8(1.9775), FIX8(0.4491), FIX8(1.9023),
743 FIX8(0.4776), FIX8(1.8271), FIX8(0.5082), FIX8(1.7519),
744 FIX8(0.5412), FIX8(1.6767), FIX8(0.5768), FIX8(1.6015),
745 FIX8(0.6152), FIX8(1.5263), FIX8(0.6568), FIX8(1.4511),
746 FIX8(0.7020), FIX8(1.3759), FIX8(0.7513), FIX8(1.3008),
747 FIX8(0.8050), FIX8(1.2256), FIX8(0.8638), FIX8(1.1504),
748 FIX8(0.9285), FIX8(1.0752), FIX8(1.0000), FIX8(1.0000)
752 /*****************************************************************************
754 *****************************************************************************/
755 void x264_cabac_context_init( x264_cabac_t *cb, int i_slice_type, int i_qp, int i_model )
757 const int8_t (*cabac_context_init)[460][2];
759 if( i_slice_type == SLICE_TYPE_I )
760 cabac_context_init = &x264_cabac_context_init_I;
762 cabac_context_init = &x264_cabac_context_init_PB[i_model];
764 for( int i = 0; i < 460; i++ )
766 int state = x264_clip3( (((*cabac_context_init)[i][0] * i_qp) >> 4) + (*cabac_context_init)[i][1], 1, 126 );
767 cb->state[i] = (X264_MIN( state, 127-state ) << 1) | (state >> 6);
771 void x264_cabac_encode_init_core( x264_cabac_t *cb )
774 cb->i_range = 0x01FE;
775 cb->i_queue = -9; // the first bit will be shifted away and not written
776 cb->i_bytes_outstanding = 0;
779 void x264_cabac_encode_init( x264_cabac_t *cb, uint8_t *p_data, uint8_t *p_end )
781 x264_cabac_encode_init_core( cb );
782 cb->p_start = p_data;
787 static inline void x264_cabac_putbyte( x264_cabac_t *cb )
789 if( cb->i_queue >= 0 )
791 int out = cb->i_low >> (cb->i_queue+10);
792 cb->i_low &= (0x400<<cb->i_queue)-1;
795 if( (out & 0xff) == 0xff )
796 cb->i_bytes_outstanding++;
799 int carry = out >> 8;
800 int bytes_outstanding = cb->i_bytes_outstanding;
801 // this can't modify before the beginning of the stream because
802 // that would correspond to a probability > 1.
803 // it will write before the beginning of the stream, which is ok
804 // because a slice header always comes before cabac data.
805 // this can't carry beyond the one byte, because any 0xff bytes
806 // are in bytes_outstanding and thus not written yet.
808 while( bytes_outstanding > 0 )
810 *(cb->p++) = carry-1;
814 cb->i_bytes_outstanding = 0;
819 static inline void x264_cabac_encode_renorm( x264_cabac_t *cb )
821 int shift = x264_cabac_renorm_shift[cb->i_range>>3];
822 cb->i_range <<= shift;
824 cb->i_queue += shift;
825 x264_cabac_putbyte( cb );
828 /* Making custom versions of this function, even in asm, for the cases where
829 * b is known to be 0 or 1, proved to be somewhat useful on x86_32 with GCC 3.4
830 * but nearly useless with GCC 4.3 and worse than useless on x86_64. */
831 void x264_cabac_encode_decision_c( x264_cabac_t *cb, int i_ctx, int b )
833 int i_state = cb->state[i_ctx];
834 int i_range_lps = x264_cabac_range_lps[i_state>>1][(cb->i_range>>6)-4];
835 cb->i_range -= i_range_lps;
836 if( b != (i_state & 1) )
838 cb->i_low += cb->i_range;
839 cb->i_range = i_range_lps;
841 cb->state[i_ctx] = x264_cabac_transition[i_state][b];
842 x264_cabac_encode_renorm( cb );
845 void x264_cabac_encode_bypass_c( x264_cabac_t *cb, int b )
848 cb->i_low += -b & cb->i_range;
850 x264_cabac_putbyte( cb );
853 void x264_cabac_encode_ue_bypass( x264_cabac_t *cb, int exp_bits, int val )
856 for( k = exp_bits; val >= (1<<k); k++ )
858 uint32_t x = (((1<<(k-exp_bits))-1)<<(k+1))+val;
864 cb->i_low += ((x>>k)&0xff) * cb->i_range;
866 x264_cabac_putbyte( cb );
871 void x264_cabac_encode_terminal_c( x264_cabac_t *cb )
874 x264_cabac_encode_renorm( cb );
877 void x264_cabac_encode_flush( x264_t *h, x264_cabac_t *cb )
879 cb->i_low += cb->i_range - 2;
883 x264_cabac_putbyte( cb );
884 x264_cabac_putbyte( cb );
885 cb->i_low <<= -cb->i_queue;
886 cb->i_low |= (0x35a4e4f5 >> (h->i_frame & 31) & 1) << 10;
888 x264_cabac_putbyte( cb );
890 while( cb->i_bytes_outstanding > 0 )
893 cb->i_bytes_outstanding--;