1 /* 2 * jaricom.c 3 * 4 * This file was part of the Independent JPEG Group's software: 5 * Developed 1997-2009 by Guido Vollbeding. 6 * libjpeg-turbo Modifications: 7 * Copyright (C) 2015, D. R. Commander. 8 * For conditions of distribution and use, see the accompanying README.ijg 9 * file. 10 * 11 * This file contains probability estimation tables for common use in 12 * arithmetic entropy encoding and decoding routines. 13 * 14 * This data represents Table D.2 in the JPEG spec (ISO/IEC IS 10918-1 15 * and CCITT Recommendation ITU-T T.81) and Table 24 in the JBIG spec 16 * (ISO/IEC IS 11544 and CCITT Recommendation ITU-T T.82). 17 */ 18 19 #define JPEG_INTERNALS 20 #include "jinclude.h" 21 #include "jpeglib.h" 22 23 /* The following #define specifies the packing of the four components 24 * into the compact JLONG representation. 25 * Note that this formula must match the actual arithmetic encoder 26 * and decoder implementation. The implementation has to be changed 27 * if this formula is changed. 28 * The current organization is leaned on Markus Kuhn's JBIG 29 * implementation (jbig_tab.c). 30 */ 31 32 #define V(i,a,b,c,d) (((JLONG)a << 16) | ((JLONG)c << 8) | ((JLONG)d << 7) | b) 33 34 const JLONG jpeg_aritab[113+1] = { 35 /* 36 * Index, Qe_Value, Next_Index_LPS, Next_Index_MPS, Switch_MPS 37 */ 38 V( 0, 0x5a1d, 1, 1, 1 ), 39 V( 1, 0x2586, 14, 2, 0 ), 40 V( 2, 0x1114, 16, 3, 0 ), 41 V( 3, 0x080b, 18, 4, 0 ), 42 V( 4, 0x03d8, 20, 5, 0 ), 43 V( 5, 0x01da, 23, 6, 0 ), 44 V( 6, 0x00e5, 25, 7, 0 ), 45 V( 7, 0x006f, 28, 8, 0 ), 46 V( 8, 0x0036, 30, 9, 0 ), 47 V( 9, 0x001a, 33, 10, 0 ), 48 V( 10, 0x000d, 35, 11, 0 ), 49 V( 11, 0x0006, 9, 12, 0 ), 50 V( 12, 0x0003, 10, 13, 0 ), 51 V( 13, 0x0001, 12, 13, 0 ), 52 V( 14, 0x5a7f, 15, 15, 1 ), 53 V( 15, 0x3f25, 36, 16, 0 ), 54 V( 16, 0x2cf2, 38, 17, 0 ), 55 V( 17, 0x207c, 39, 18, 0 ), 56 V( 18, 0x17b9, 40, 19, 0 ), 57 V( 19, 0x1182, 42, 20, 0 ), 58 V( 20, 0x0cef, 43, 21, 0 ), 59 V( 21, 0x09a1, 45, 22, 0 ), 60 V( 22, 0x072f, 46, 23, 0 ), 61 V( 23, 0x055c, 48, 24, 0 ), 62 V( 24, 0x0406, 49, 25, 0 ), 63 V( 25, 0x0303, 51, 26, 0 ), 64 V( 26, 0x0240, 52, 27, 0 ), 65 V( 27, 0x01b1, 54, 28, 0 ), 66 V( 28, 0x0144, 56, 29, 0 ), 67 V( 29, 0x00f5, 57, 30, 0 ), 68 V( 30, 0x00b7, 59, 31, 0 ), 69 V( 31, 0x008a, 60, 32, 0 ), 70 V( 32, 0x0068, 62, 33, 0 ), 71 V( 33, 0x004e, 63, 34, 0 ), 72 V( 34, 0x003b, 32, 35, 0 ), 73 V( 35, 0x002c, 33, 9, 0 ), 74 V( 36, 0x5ae1, 37, 37, 1 ), 75 V( 37, 0x484c, 64, 38, 0 ), 76 V( 38, 0x3a0d, 65, 39, 0 ), 77 V( 39, 0x2ef1, 67, 40, 0 ), 78 V( 40, 0x261f, 68, 41, 0 ), 79 V( 41, 0x1f33, 69, 42, 0 ), 80 V( 42, 0x19a8, 70, 43, 0 ), 81 V( 43, 0x1518, 72, 44, 0 ), 82 V( 44, 0x1177, 73, 45, 0 ), 83 V( 45, 0x0e74, 74, 46, 0 ), 84 V( 46, 0x0bfb, 75, 47, 0 ), 85 V( 47, 0x09f8, 77, 48, 0 ), 86 V( 48, 0x0861, 78, 49, 0 ), 87 V( 49, 0x0706, 79, 50, 0 ), 88 V( 50, 0x05cd, 48, 51, 0 ), 89 V( 51, 0x04de, 50, 52, 0 ), 90 V( 52, 0x040f, 50, 53, 0 ), 91 V( 53, 0x0363, 51, 54, 0 ), 92 V( 54, 0x02d4, 52, 55, 0 ), 93 V( 55, 0x025c, 53, 56, 0 ), 94 V( 56, 0x01f8, 54, 57, 0 ), 95 V( 57, 0x01a4, 55, 58, 0 ), 96 V( 58, 0x0160, 56, 59, 0 ), 97 V( 59, 0x0125, 57, 60, 0 ), 98 V( 60, 0x00f6, 58, 61, 0 ), 99 V( 61, 0x00cb, 59, 62, 0 ), 100 V( 62, 0x00ab, 61, 63, 0 ), 101 V( 63, 0x008f, 61, 32, 0 ), 102 V( 64, 0x5b12, 65, 65, 1 ), 103 V( 65, 0x4d04, 80, 66, 0 ), 104 V( 66, 0x412c, 81, 67, 0 ), 105 V( 67, 0x37d8, 82, 68, 0 ), 106 V( 68, 0x2fe8, 83, 69, 0 ), 107 V( 69, 0x293c, 84, 70, 0 ), 108 V( 70, 0x2379, 86, 71, 0 ), 109 V( 71, 0x1edf, 87, 72, 0 ), 110 V( 72, 0x1aa9, 87, 73, 0 ), 111 V( 73, 0x174e, 72, 74, 0 ), 112 V( 74, 0x1424, 72, 75, 0 ), 113 V( 75, 0x119c, 74, 76, 0 ), 114 V( 76, 0x0f6b, 74, 77, 0 ), 115 V( 77, 0x0d51, 75, 78, 0 ), 116 V( 78, 0x0bb6, 77, 79, 0 ), 117 V( 79, 0x0a40, 77, 48, 0 ), 118 V( 80, 0x5832, 80, 81, 1 ), 119 V( 81, 0x4d1c, 88, 82, 0 ), 120 V( 82, 0x438e, 89, 83, 0 ), 121 V( 83, 0x3bdd, 90, 84, 0 ), 122 V( 84, 0x34ee, 91, 85, 0 ), 123 V( 85, 0x2eae, 92, 86, 0 ), 124 V( 86, 0x299a, 93, 87, 0 ), 125 V( 87, 0x2516, 86, 71, 0 ), 126 V( 88, 0x5570, 88, 89, 1 ), 127 V( 89, 0x4ca9, 95, 90, 0 ), 128 V( 90, 0x44d9, 96, 91, 0 ), 129 V( 91, 0x3e22, 97, 92, 0 ), 130 V( 92, 0x3824, 99, 93, 0 ), 131 V( 93, 0x32b4, 99, 94, 0 ), 132 V( 94, 0x2e17, 93, 86, 0 ), 133 V( 95, 0x56a8, 95, 96, 1 ), 134 V( 96, 0x4f46, 101, 97, 0 ), 135 V( 97, 0x47e5, 102, 98, 0 ), 136 V( 98, 0x41cf, 103, 99, 0 ), 137 V( 99, 0x3c3d, 104, 100, 0 ), 138 V( 100, 0x375e, 99, 93, 0 ), 139 V( 101, 0x5231, 105, 102, 0 ), 140 V( 102, 0x4c0f, 106, 103, 0 ), 141 V( 103, 0x4639, 107, 104, 0 ), 142 V( 104, 0x415e, 103, 99, 0 ), 143 V( 105, 0x5627, 105, 106, 1 ), 144 V( 106, 0x50e7, 108, 107, 0 ), 145 V( 107, 0x4b85, 109, 103, 0 ), 146 V( 108, 0x5597, 110, 109, 0 ), 147 V( 109, 0x504f, 111, 107, 0 ), 148 V( 110, 0x5a10, 110, 111, 1 ), 149 V( 111, 0x5522, 112, 109, 0 ), 150 V( 112, 0x59eb, 112, 111, 1 ), 151 /* 152 * This last entry is used for fixed probability estimate of 0.5 153 * as recommended in Section 10.3 Table 5 of ITU-T Rec. T.851. 154 */ 155 V( 113, 0x5a1d, 113, 113, 0 ) 156 }; 157
