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/******************************************************************************
*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*****************************************************************************
* Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
*/
/**
*******************************************************************************
* @file
* ih264e_cabac_structs.h
*
* @brief
* This file contains cabac related structure definitions.
*
* @author
* Doney Alex
*
* @remarks
* none
*
*******************************************************************************
*/
#ifndef IH264E_CABAC_STRUCTS_H_
#define IH264E_CABAC_STRUCTS_H_
#define CABAC_INIT_IDC 2
/**
******************************************************************************
* @brief typedef for context model
******************************************************************************
*/
/* bits 0 to 5 :state
bit 6 :mps */
typedef UWORD8 bin_ctxt_model;
/**
******************************************************************************
* @brief MB info for cabac
******************************************************************************
*/
typedef struct
{
/* Neighbour availability Variables needed to get CtxtInc, for CABAC */
UWORD8 u1_mb_type; /* !< macroblock type: I/P/B/SI/SP */
UWORD8 u1_cbp; /* !< Coded Block Pattern */
UWORD8 u1_intrapred_chroma_mode;
/*************************************************************************/
/* Arrangnment of AC CSBP */
/* bits: b7 b6 b5 b4 b3 b2 b1 b0 */
/* CSBP: V1 V0 U1 U0 Y3 Y2 Y1 Y0 */
/*************************************************************************/
UWORD8 u1_yuv_ac_csbp;
/*************************************************************************/
/* Arrangnment of DC CSBP */
/* bits: b7 b6 b5 b4 b3 b2 b1 b0 */
/* CSBP: x x x x x Vdc Udc Ydc */
/*************************************************************************/
UWORD8 u1_yuv_dc_csbp;
WORD8 i1_ref_idx[4];
UWORD8 u1_mv[4][4];
} mb_info_ctxt_t;
/**
******************************************************************************
* @brief CSBP info for CABAC
******************************************************************************
*/
typedef struct
{
/*************************************************************************/
/* Arrangnment of Luma AC CSBP for leftMb */
/* bits: b7 b6 b5 b4 b3 b2 b1 b0 */
/* CSBP: X X X X Y3 Y2 Y1 Y0 */
/*************************************************************************/
/*************************************************************************/
/* Points either to u1_y_ac_csbp_top_mb or u1_y_ac_csbp_bot_mb */
/*************************************************************************/
UWORD8 u1_y_ac_csbp_top_mb;
UWORD8 u1_y_ac_csbp_bot_mb;
/*************************************************************************/
/* Arrangnment of Chroma AC CSBP for leftMb */
/* bits: b7 b6 b5 b4 b3 b2 b1 b0 */
/* CSBP: X X X X V1 V0 U1 U0 */
/*************************************************************************/
/*************************************************************************/
/* Points either to u1_uv_ac_csbp_top_mb or u1_uv_ac_csbp_bot_mb */
/*************************************************************************/
UWORD8 u1_uv_ac_csbp_top_mb;
UWORD8 u1_uv_ac_csbp_bot_mb;
/*************************************************************************/
/* Arrangnment of DC CSBP */
/* bits: b7 b6 b5 b4 b3 b2 b1 b0 */
/* CSBP: x x x x x Vdc Udc Ydc */
/*************************************************************************/
/*************************************************************************/
/* Points either to u1_yuv_dc_csbp_top_mb or u1_yuv_dc_csbp_bot_mb */
/*************************************************************************/
UWORD8 u1_yuv_dc_csbp_top_mb;
UWORD8 u1_yuv_dc_csbp_bot_mb;
} cab_csbp_t;
/**
******************************************************************************
* @brief CABAC Encoding Environment
******************************************************************************
*/
typedef struct
{
/** cabac interval start L */
UWORD32 u4_code_int_low;
/** cabac interval range R */
UWORD32 u4_code_int_range;
/** bytes_outsanding; number of 0xFF bits that occur during renorm
* These will be accumulated till the carry bit is knwon
*/
UWORD32 u4_out_standing_bytes;
/** bits generated during renormalization
* A byte is put to stream/u4_out_standing_bytes from u4_low(L) when
* u4_bits_gen exceeds 8
*/
UWORD32 u4_bits_gen;
} encoding_envirnoment_t;
/**
******************************************************************************
* @brief CABAC Context structure : Variables to handle Cabac
******************************************************************************
*/
typedef struct
{
/* Base pointer to all the cabac contexts */
bin_ctxt_model au1_cabac_ctxt_table[NUM_CABAC_CTXTS];
cab_csbp_t s_lft_csbp;
/**
* pointer to Bitstream structure
*/
bitstrm_t *ps_bitstrm;
/* Pointer to mb_info_ctxt_t map_base */
mb_info_ctxt_t *ps_mb_map_ctxt_inc_base;
/* Pointer to encoding_envirnoment_t */
encoding_envirnoment_t s_cab_enc_env;
/* These things need to be updated at each MbLevel */
/* Prev ps_mb_qp_delta_ctxt */
WORD8 i1_prevps_mb_qp_delta_ctxt;
/* Pointer to mb_info_ctxt_t map */
mb_info_ctxt_t *ps_mb_map_ctxt_inc;
/* Pointer to default mb_info_ctxt_t */
mb_info_ctxt_t *ps_def_ctxt_mb_info;
/* Pointer to current mb_info_ctxt_t */
mb_info_ctxt_t *ps_curr_ctxt_mb_info;
/* Pointer to left mb_info_ctxt_t */
mb_info_ctxt_t *ps_left_ctxt_mb_info;
/* Pointer to top mb_info_ctxt_t */
mb_info_ctxt_t *ps_top_ctxt_mb_info;
/* Poniter to left csbp structure */
cab_csbp_t *ps_lft_csbp;
UWORD8 *pu1_left_y_ac_csbp;
UWORD8 *pu1_left_uv_ac_csbp;
UWORD8 *pu1_left_yuv_dc_csbp;
/***************************************************************************/
/* Ref_idx contexts are stored in the following way */
/* Array Idx 0,1 for reference indices in Forward direction */
/* Array Idx 2,3 for reference indices in backward direction */
/***************************************************************************/
/* Dimensions for u1_left_ref_ctxt_inc_arr is [2][4] for Mbaff:Top and Bot */
WORD8 i1_left_ref_idx_ctx_inc_arr[2][4];
WORD8 *pi1_left_ref_idx_ctxt_inc;
/* Dimensions for u1_left_mv_ctxt_inc_arr is [2][4][4] for Mbaff case */
UWORD8 u1_left_mv_ctxt_inc_arr[2][4][4];
UWORD8 (*pu1_left_mv_ctxt_inc)[4];
} cabac_ctxt_t;
#endif /* IH264E_CABAC_STRUCTS_H_ */
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