1 /****************************************************************************** 2 * 3 * Copyright (C) 2015 The Android Open Source Project 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at: 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 ***************************************************************************** 18 * Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore 19 */ 20 21 /** 22 ****************************************************************************** 23 * @file 24 * ih264_cavlc_tables.c 25 * 26 * @brief 27 * This file contains H264 cavlc tables for encoding coeff_tokens, levels, total 28 * zeros and runs before zeros 29 * 30 * @author 31 * ittiam 32 * 33 * @remarks 34 * none 35 * 36 ****************************************************************************** 37 */ 38 39 /*****************************************************************************/ 40 /* File Includes */ 41 /*****************************************************************************/ 42 43 /* User include files */ 44 #include "ih264_typedefs.h" 45 #include "ih264_cavlc_tables.h" 46 47 48 /*****************************************************************************/ 49 /* Extern global definitions */ 50 /*****************************************************************************/ 51 52 /** 53 ****************************************************************************** 54 * @brief Assignment of cbp to a codenum for intra and inter prediction modes 55 * chroma format idc != 0 56 * input : cbp, intra - 0/inter - 1 57 * output : codenum 58 * @remarks Table 9-4 - Assignment of codeNum to values of coded_block_pattern 59 * for macroblock prediction modes in H264 spec 60 ****************************************************************************** 61 */ 62 const UWORD8 gu1_cbp_map_tables[48][2]= 63 { 64 { 3, 0}, {29, 2}, {30, 3}, {17, 7}, {31, 4}, {18, 8}, {37, 17}, { 8, 13}, 65 {32, 5}, {38, 18}, {19, 9}, { 9, 14}, {20, 10}, {10, 15}, {11, 16}, { 2, 11}, 66 {16, 1}, {33, 32}, {34, 33}, {21, 36}, {35, 34}, {22, 37}, {39, 44}, { 4, 40}, 67 {36, 35}, {40, 45}, {23, 38}, { 5, 41}, {24, 39}, { 6, 42}, { 7, 43}, { 1, 19}, 68 {41, 6}, {42, 24}, {43, 25}, {25, 20}, {44, 26}, {26, 21}, {46, 46}, {12, 28}, 69 {45, 27}, {47, 47}, {27, 22}, {13, 29}, {28, 23}, {14, 30}, {15, 31}, { 0, 12}, 70 }; 71 72 73 /** 74 ****************************************************************************** 75 * @brief total non-zero coefficients and numbers of trailing ones of a residual 76 * block are mapped to coeff_token using the tables given below. 77 * input : VLC-Num | Trailing ones | Total coeffs 78 * output : coeff_token (code word, size of the code word) 79 * @remarks Table-9-5 coeff_token mapping to TotalCoeff( coeff_token ) 80 * and TrailingOnes( coeff_token ) in H264 spec 81 ****************************************************************************** 82 */ 83 const UWORD8 gu1_code_coeff_token_table[3][4][16] = 84 { 85 { 86 { 5, 7, 7, 7, 7, 15, 11, 8, 15, 11, 15, 11, 15, 11, 7, 4, }, 87 { 1, 4, 6, 6, 6, 6, 14, 10, 14, 10, 14, 10, 1, 14, 10, 6, }, 88 { 0, 1, 5, 5, 5, 5, 5, 13, 9, 13, 9, 13, 9, 13, 9, 5, }, 89 { 0, 0, 3, 3, 4, 4, 4, 4, 4, 12, 12, 8, 12, 8, 12, 8, }, 90 }, 91 { 92 {11, 7, 7, 7, 4, 7, 15, 11, 15, 11, 8, 15, 11, 7, 9, 7, }, 93 { 2, 7, 10, 6, 6, 6, 6, 14, 10, 14, 10, 14, 10, 11, 8, 6, }, 94 { 0, 3, 9, 5, 5, 5, 5, 13, 9, 13, 9, 13, 9, 6, 10, 5, }, 95 { 0, 0, 5, 4, 6, 8, 4, 4, 4, 12, 8, 12, 12, 8, 1, 4, }, 96 }, 97 { 98 {15, 11, 8, 15, 11, 9, 8, 15, 11, 15, 11, 8, 13, 9, 5, 1, }, 99 {14, 15, 12, 10, 8, 14, 10, 14, 14, 10, 14, 10, 7, 12, 8, 4, }, 100 { 0, 13, 14, 11, 9, 13, 9, 13, 10, 13, 9, 13, 9, 11, 7, 3, }, 101 { 0, 0, 12, 11, 10, 9, 8, 13, 12, 12, 12, 8, 12, 10, 6, 2, }, 102 }, 103 }; 104 105 const UWORD8 gu1_size_coeff_token_table[3][4][16] = 106 { 107 { 108 { 6, 8, 9, 10, 11, 13, 13, 13, 14, 14, 15, 15, 16, 16, 16, 16, }, 109 { 2, 6, 8, 9, 10, 11, 13, 13, 14, 14, 15, 15, 15, 16, 16, 16, }, 110 { 0, 3, 7, 8, 9, 10, 11, 13, 13, 14, 14, 15, 15, 16, 16, 16, }, 111 { 0, 0, 5, 6, 7, 8, 9, 10, 11, 13, 14, 14, 15, 15, 16, 16, }, 112 }, 113 { 114 { 6, 6, 7, 8, 8, 9, 11, 11, 12, 12, 12, 13, 13, 13, 14, 14, }, 115 { 2, 5, 6, 6, 7, 8, 9, 11, 11, 12, 12, 13, 13, 14, 14, 14, }, 116 { 0, 3, 6, 6, 7, 8, 9, 11, 11, 12, 12, 13, 13, 13, 14, 14, }, 117 { 0, 0, 4, 4, 5, 6, 6, 7, 9, 11, 11, 12, 13, 13, 13, 14, }, 118 }, 119 { 120 { 6, 6, 6, 7, 7, 7, 7, 8, 8, 9, 9, 9, 10, 10, 10, 10, }, 121 { 4, 5, 5, 5, 5, 6, 6, 7, 8, 8, 9, 9, 9, 10, 10, 10, }, 122 { 0, 4, 5, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 10, }, 123 { 0, 0, 4, 4, 4, 4, 4, 5, 6, 7, 8, 8, 9, 10, 10, 10, }, 124 }, 125 }; 126 const UWORD8 gu1_code_coeff_token_table_chroma[4][4] = 127 { 128 { 7, 4, 3, 2, }, 129 { 1, 6, 3, 3, }, 130 { 0, 1, 2, 2, }, 131 { 0, 0, 5, 0, }, 132 }; 133 134 const UWORD8 gu1_size_coeff_token_table_chroma[4][4] = 135 { 136 { 6, 6, 6, 6, }, 137 { 1, 6, 7, 8, }, 138 { 0, 3, 7, 8, }, 139 { 0, 0, 6, 7, }, 140 }; 141 142 /** 143 ****************************************************************************** 144 * @brief After encoding the current Level, to encode the next level, the choice 145 * of VLC table needs to be updated. The update is carried basing on a set of thresholds. 146 * These thresholds are listed in the table below for lookup. 147 * input : suffix_length 148 * output : threshold 149 ****************************************************************************** 150 */ 151 const UWORD8 gu1_threshold_vlc_level[6] = 152 { 153 0, 3, 6, 12, 24, 48 154 }; 155 156 157 /** 158 ****************************************************************************** 159 * @brief table for encoding total number of zeros 160 * input : coeff_token, total zeros 161 * output : code word, size of the code word 162 * @remarks Table-9-7, 9-8 total_zeros tables for 4x4 blocks with 163 * TotalCoeff( coeff_token ) in H264 spec 164 ****************************************************************************** 165 */ 166 const UWORD8 gu1_size_zero_table[135] = 167 { 168 1, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 9, 169 3, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 6, 6, 6, 6, 170 4, 3, 3, 3, 4, 4, 3, 3, 4, 5, 5, 6, 5, 6, 171 5, 3, 4, 4, 3, 3, 3, 4, 3, 4, 5, 5, 5, 172 4, 4, 4, 3, 3, 3, 3, 3, 4, 5, 4, 5, 173 6, 5, 3, 3, 3, 3, 3, 3, 4, 3, 6, 174 6, 5, 3, 3, 3, 2, 3, 4, 3, 6, 175 6, 4, 5, 3, 2, 2, 3, 3, 6, 176 6, 6, 4, 2, 2, 3, 2, 5, 177 5, 5, 3, 2, 2, 2, 4, 178 4, 4, 3, 3, 1, 3, 179 4, 4, 2, 1, 3, 180 3, 3, 1, 2, 181 2, 2, 1, 182 1, 1, 183 }; 184 const UWORD8 gu1_code_zero_table[135] = 185 { 186 1, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 1, 187 7, 6, 5, 4, 3, 5, 4, 3, 2, 3, 2, 3, 2, 1, 0, 188 5, 7, 6, 5, 4, 3, 4, 3, 2, 3, 2, 1, 1, 0, 189 3, 7, 5, 4, 6, 5, 4, 3, 3, 2, 2, 1, 0, 190 5, 4, 3, 7, 6, 5, 4, 3, 2, 1, 1, 0, 191 1, 1, 7, 6, 5, 4, 3, 2, 1, 1, 0, 192 1, 1, 5, 4, 3, 3, 2, 1, 1, 0, 193 1, 1, 1, 3, 3, 2, 2, 1, 0, 194 1, 0, 1, 3, 2, 1, 1, 1, 195 1, 0, 1, 3, 2, 1, 1, 196 0, 1, 1, 2, 1, 3, 197 0, 1, 1, 1, 1, 198 0, 1, 1, 1, 199 0, 1, 1, 200 0, 1, 201 }; 202 const UWORD8 gu1_size_zero_table_chroma[9] = 203 { 204 1, 2, 3, 3, 205 1, 2, 2, 206 1, 1, 207 }; 208 const UWORD8 gu1_code_zero_table_chroma[9] = 209 { 210 1, 1, 1, 0, 211 1, 1, 0, 212 1, 0, 213 }; 214 215 /** 216 ****************************************************************************** 217 * @brief index to access zero table (look up) 218 * input : TotalCoeff( coeff_token ) 219 * output : index to access zero table 220 ****************************************************************************** 221 */ 222 const UWORD8 gu1_index_zero_table[15] = 223 { 224 0, 16, 31, 45, 58, 70, 81, 91, 100, 108, 115, 121, 126, 130, 133, 225 }; 226 227 /** 228 ****************************************************************************** 229 * @brief table for encoding runs of zeros before 230 * input : zeros left, runs of zeros before 231 * output : code word, size of the code word 232 * @remarks Table-9-10 table for run_before in H264 spec 233 ****************************************************************************** 234 */ 235 const UWORD8 gu1_size_run_table[42] = 236 { 237 1, 1, 238 1, 2, 2, 239 2, 2, 2, 2, 240 2, 2, 2, 3, 3, 241 2, 2, 3, 3, 3, 3, 242 2, 3, 3, 3, 3, 3, 3, 243 3, 3, 3, 3, 3, 3, 3, 4, 5, 6, 7, 8, 9, 10, 11, 244 }; 245 const UWORD8 gu1_code_run_table[42] = 246 { 247 1, 0, 248 1, 1, 0, 249 3, 2, 1, 0, 250 3, 2, 1, 1, 0, 251 3, 2, 3, 2, 1, 0, 252 3, 0, 1, 3, 2, 5, 4, 253 7, 6, 5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 254 }; 255 256 /** 257 ****************************************************************************** 258 * @brief index to access zero table (look up) 259 * input : TotalCoeff( coeff_token ) 260 * output : index to access zero table 261 ****************************************************************************** 262 */ 263 const UWORD8 gu1_index_run_table[7] = 264 { 265 0, 2, 5, 9, 14, 20, 27, 266 }; 267