Hamsalekha S | 8d3d303 | 2015-03-13 21:24:58 +0530 | [diff] [blame] | 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_ */ |