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  */
66 typedef 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  */
114 extern 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  */
125 extern 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  */
133 extern 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