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 ih264_cavlc_tables.h 24 * 25 * @brief 26 * This file contains enumerations, macros and extern declarations of H264 27 * cavlc tables 28 * 29 * @author 30 * Ittiam 31 * 32 * @remarks 33 * none 34 ****************************************************************************** 35 */ 36 37 #ifndef IH264_CAVLC_TABLES_H_ 38 #define IH264_CAVLC_TABLES_H_ 39 40 /*****************************************************************************/ 41 /* Constant Macros */ 42 /*****************************************************************************/ 43 /** 44 ****************************************************************************** 45 * @brief maximum zeros left 46 ****************************************************************************** 47 */ 48 #define MAX_ZERO_LEFT 6 49 50 /*****************************************************************************/ 51 /* Extern global declarations */ 52 /*****************************************************************************/ 53 54 /** 55 ****************************************************************************** 56 * @brief Assignment of cbp to a codenum for intra and inter prediction modes 57 * chroma format idc != 0 58 * input : cbp, intra - 0/inter - 1 59 * output : codenum 60 * @remarks Table 9-4 Assignment of codeNum to values of coded_block_pattern 61 * for macroblock prediction modes in H264 spec 62 ****************************************************************************** 63 */ 64 extern const UWORD8 gu1_cbp_map_tables[48][2]; 65 66 /** 67 ****************************************************************************** 68 * @brief total non-zero coefficients and numbers of trailing ones of a residual 69 * block are mapped to coefftoken using the tables given below. 70 * input : VLC-Num | Trailing ones | Total coeffs 71 * output : coeff_token (code word, size of the code word) 72 * @remarks Table-9-5 coeff_token mapping to TotalCoeff( coeff_token ) 73 * and TrailingOnes( coeff_token ) in H264 spec 74 ****************************************************************************** 75 */ 76 extern const UWORD8 gu1_code_coeff_token_table[3][4][16]; 77 extern const UWORD8 gu1_size_coeff_token_table[3][4][16]; 78 extern const UWORD8 gu1_code_coeff_token_table_chroma[4][4]; 79 extern const UWORD8 gu1_size_coeff_token_table_chroma[4][4]; 80 81 /** 82 ****************************************************************************** 83 * @brief Thresholds for determining whether to increment Level table number. 84 * input : suffix_length 85 * output : threshold 86 ****************************************************************************** 87 */ 88 extern const UWORD8 gu1_threshold_vlc_level[6]; 89 90 /** 91 ****************************************************************************** 92 * @brief table for encoding total number of zeros 93 * input : coeff_token, total zeros 94 * output : code word, size of the code word 95 * @remarks Table-9-7, 9-8 total_zeros tables for 4x4 blocks with 96 * TotalCoeff( coeff_token ) in H264 spec 97 ****************************************************************************** 98 */ 99 extern const UWORD8 gu1_size_zero_table[135]; 100 extern const UWORD8 gu1_code_zero_table[135]; 101 extern const UWORD8 gu1_size_zero_table_chroma[9]; 102 extern const UWORD8 gu1_code_zero_table_chroma[9]; 103 104 /** 105 ****************************************************************************** 106 * @brief index to access zero table (for speed) 107 * input : TotalCoeff( coeff_token ) 108 * output : index to access zero table 109 ****************************************************************************** 110 */ 111 extern const UWORD8 gu1_index_zero_table[15]; 112 113 /** 114 ****************************************************************************** 115 * @brief table for encoding runs of zeros before 116 * input : zeros left, runs of zeros before 117 * output : code word, size of the code word 118 * @remarks Table-9-10 table for run_before in H264 spec 119 ****************************************************************************** 120 */ 121 extern const UWORD8 gu1_size_run_table[42]; 122 extern const UWORD8 gu1_code_run_table[42]; 123 124 /** 125 ****************************************************************************** 126 * @brief index to access run table (look up) 127 * input : zeros left 128 * output : index to access run table 129 ****************************************************************************** 130 */ 131 extern const UWORD8 gu1_index_run_table[7]; 132 133 #endif /* IH264_CAVLC_TABLES_H_ */ 134
