ihevc_cabac_tables.h revision 0d8951cef4b1a1dbf4ff5ba3e8796cf1d4503098 
1/******************************************************************************
2*
3* Copyright (C) 2012 Ittiam Systems Pvt Ltd, Bangalore
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
19/**
20******************************************************************************
21* @file ihevc_cabac_tables.h
22*
23* @brief
24*  This file contains enumerations, macros and extern declarations of HEVC
25*  cabac tables
26*
27* @author
28*  Ittiam
29******************************************************************************
30*/
31
32#ifndef _IHEVC_CABAC_TABLES_H_
33#define _IHEVC_CABAC_TABLES_H_
34
35/*****************************************************************************/
36/* Constant Macros                                                           */
37/*****************************************************************************/
38
39/**
40******************************************************************************
41 *  @brief  maximum range of cabac_init_idc (0-2)
42******************************************************************************
43 */
44#define IHEVC_NUM_CAB_IDC   3
45
46/**
47******************************************************************************
48 *  @brief  max range of qps in HEVC (0-51)
49******************************************************************************
50 */
51#define IHEVC_MAX_QP      52
52
53
54/*****************************************************************************/
55/* Enums                                                                     */
56/*****************************************************************************/
57
58/**
59 *****************************************************************************
60 *  @brief   start offsets of cabac contexts for various syntax elements
61 *
62 *  @remarks Init ContextModel generation and these offsets are tightly coupled
63             See the cabac table generation utility for these offsets
64 *****************************************************************************
65 */
66typedef enum
67{
68    IHEVC_CAB_SAO_MERGE             = 0,
69    IHEVC_CAB_SAO_TYPE              = IHEVC_CAB_SAO_MERGE               + 1,
70    IHEVC_CAB_SPLIT_CU_FLAG         = IHEVC_CAB_SAO_TYPE                + 1,
71    IHEVC_CAB_CU_TQ_BYPASS_FLAG     = IHEVC_CAB_SPLIT_CU_FLAG           + 3,
72    IHEVC_CAB_SKIP_FLAG             = IHEVC_CAB_CU_TQ_BYPASS_FLAG       + 1,
73    IHEVC_CAB_QP_DELTA_ABS          = IHEVC_CAB_SKIP_FLAG               + 3,
74    IHEVC_CAB_PRED_MODE             = IHEVC_CAB_QP_DELTA_ABS            + 2,
75    IHEVC_CAB_PART_MODE             = IHEVC_CAB_PRED_MODE               + 1,
76    IHEVC_CAB_INTRA_LUMA_PRED_FLAG  = IHEVC_CAB_PART_MODE               + 4,
77    IHEVC_CAB_CHROMA_PRED_MODE      = IHEVC_CAB_INTRA_LUMA_PRED_FLAG    + 1,
78    IHEVC_CAB_MERGE_FLAG_EXT        = IHEVC_CAB_CHROMA_PRED_MODE        + 1,
79    IHEVC_CAB_MERGE_IDX_EXT         = IHEVC_CAB_MERGE_FLAG_EXT          + 1,
80    IHEVC_CAB_INTER_PRED_IDC        = IHEVC_CAB_MERGE_IDX_EXT           + 1,
81    IHEVC_CAB_INTER_REF_IDX         = IHEVC_CAB_INTER_PRED_IDC          + 5,
82    IHEVC_CAB_MVD_GRT0              = IHEVC_CAB_INTER_REF_IDX           + 2,
83    IHEVC_CAB_MVD_GRT1              = IHEVC_CAB_MVD_GRT0                + 1,
84    IHEVC_CAB_MVP_L0L1              = IHEVC_CAB_MVD_GRT1                + 1,
85    IHEVC_CAB_NORES_IDX             = IHEVC_CAB_MVP_L0L1                + 1,
86    IHEVC_CAB_SPLIT_TFM             = IHEVC_CAB_NORES_IDX               + 1,
87    IHEVC_CAB_CBF_LUMA_IDX          = IHEVC_CAB_SPLIT_TFM               + 3,
88    IHEVC_CAB_CBCR_IDX              = IHEVC_CAB_CBF_LUMA_IDX            + 2,
89    IHEVC_CAB_TFM_SKIP0             = IHEVC_CAB_CBCR_IDX                + 4,
90    IHEVC_CAB_TFM_SKIP12            = IHEVC_CAB_TFM_SKIP0               + 1,
91    IHEVC_CAB_COEFFX_PREFIX         = IHEVC_CAB_TFM_SKIP12              + 1,
92    IHEVC_CAB_COEFFY_PREFIX         = IHEVC_CAB_COEFFX_PREFIX           + 18,
93    IHEVC_CAB_CODED_SUBLK_IDX       = IHEVC_CAB_COEFFY_PREFIX           + 18,
94    IHEVC_CAB_COEFF_FLAG            = IHEVC_CAB_CODED_SUBLK_IDX         + 4,
95    IHEVC_CAB_COEFABS_GRTR1_FLAG    = IHEVC_CAB_COEFF_FLAG              + 42,
96    IHEVC_CAB_COEFABS_GRTR2_FLAG    = IHEVC_CAB_COEFABS_GRTR1_FLAG      + 24,
97    IHEVC_CAB_CTXT_END              = IHEVC_CAB_COEFABS_GRTR2_FLAG      + 6
98}IHEVC_CABAC_CTXT_OFFSETS;
99
100
101/*****************************************************************************/
102/* Extern global declarations                                                */
103/*****************************************************************************/
104
105/**
106 ******************************************************************************
107 * @brief  Table for rangeTabLPS depending on pStateIdx and qCodIRangeIdx
108 * input   : pStateIdx(0-63) and qCodIRangeIdx(0-3) [(Range >> 6) & 0x3]
109 * output  : RLps
110 *
111 * @remarks See Table 9-40 of HEVC spec for rangeTabLPS
112 *******************************************************************************
113 */
114extern const UWORD8 gau1_ihevc_cabac_rlps[64][4];
115
116
117/**
118 ******************************************************************************
119 * @brief  probaility+MPS state transition tables based on cur State and bin
120 * input  : curpState[bits7-2]  | curMPS[bit1] | decodedBin[bit0]
121 * output : nextpState[bits6-1] | nextMPS[bit0]
122 * @remarks Modified form of Table-9-41 State Transition table in HEVC spec
123 ******************************************************************************
124 */
125extern const UWORD8 gau1_ihevc_next_state[128*2];
126
127/**
128 ******************************************************************************
129 * @brief  Init context tables for all combinations of qp and cabac_init_idc
130 * @remarks Packing format MPS in lsb and pState in bits[1-6]
131 ******************************************************************************
132 */
133extern const UWORD8 gau1_ihevc_cab_ctxts[IHEVC_NUM_CAB_IDC][IHEVC_MAX_QP][IHEVC_CAB_CTXT_END];
134
135
136
137#endif /* _IHEVC_CABAC_TABLES_H_ */
138