1 /* 2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #include "boolhuff.h" 12 13 #if defined(SECTIONBITS_OUTPUT) 14 unsigned __int64 Sectionbits[500]; 15 16 #endif 17 18 #ifdef VP8_ENTROPY_STATS 19 unsigned int active_section = 0; 20 #endif 21 22 const unsigned int vp8_prob_cost[256] = { 23 2047, 2047, 1791, 1641, 1535, 1452, 1385, 1328, 1279, 1235, 1196, 1161, 1129, 24 1099, 1072, 1046, 1023, 1000, 979, 959, 940, 922, 905, 889, 873, 858, 25 843, 829, 816, 803, 790, 778, 767, 755, 744, 733, 723, 713, 703, 26 693, 684, 675, 666, 657, 649, 641, 633, 625, 617, 609, 602, 594, 27 587, 580, 573, 567, 560, 553, 547, 541, 534, 528, 522, 516, 511, 28 505, 499, 494, 488, 483, 477, 472, 467, 462, 457, 452, 447, 442, 29 437, 433, 428, 424, 419, 415, 410, 406, 401, 397, 393, 389, 385, 30 381, 377, 373, 369, 365, 361, 357, 353, 349, 346, 342, 338, 335, 31 331, 328, 324, 321, 317, 314, 311, 307, 304, 301, 297, 294, 291, 32 288, 285, 281, 278, 275, 272, 269, 266, 263, 260, 257, 255, 252, 33 249, 246, 243, 240, 238, 235, 232, 229, 227, 224, 221, 219, 216, 34 214, 211, 208, 206, 203, 201, 198, 196, 194, 191, 189, 186, 184, 35 181, 179, 177, 174, 172, 170, 168, 165, 163, 161, 159, 156, 154, 36 152, 150, 148, 145, 143, 141, 139, 137, 135, 133, 131, 129, 127, 37 125, 123, 121, 119, 117, 115, 113, 111, 109, 107, 105, 103, 101, 38 99, 97, 95, 93, 92, 90, 88, 86, 84, 82, 81, 79, 77, 39 75, 73, 72, 70, 68, 66, 65, 63, 61, 60, 58, 56, 55, 40 53, 51, 50, 48, 46, 45, 43, 41, 40, 38, 37, 35, 33, 41 32, 30, 29, 27, 25, 24, 22, 21, 19, 18, 16, 15, 13, 42 12, 10, 9, 7, 6, 4, 3, 1, 1 43 }; 44 45 void vp8_start_encode(BOOL_CODER *br, unsigned char *source, 46 unsigned char *source_end) { 47 br->lowvalue = 0; 48 br->range = 255; 49 br->count = -24; 50 br->buffer = source; 51 br->buffer_end = source_end; 52 br->pos = 0; 53 } 54 55 void vp8_stop_encode(BOOL_CODER *br) { 56 int i; 57 58 for (i = 0; i < 32; ++i) vp8_encode_bool(br, 0, 128); 59 } 60 61 void vp8_encode_value(BOOL_CODER *br, int data, int bits) { 62 int bit; 63 64 for (bit = bits - 1; bit >= 0; bit--) { 65 vp8_encode_bool(br, (1 & (data >> bit)), 0x80); 66 } 67 } 68
