149 lines
6.1 KiB
C
149 lines
6.1 KiB
C
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/******************************************************************************
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*
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* Copyright (C) 2022 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*****************************************************************************
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* Originally developed and contributed by Ittiam Systems Pvt. Ltd, Bangalore
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*/
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/**
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*******************************************************************************
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* @file
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* isvcd_cabac.c
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*
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* @brief
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* This file contains Binary decoding routines.
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*
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* @author
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* Kishore
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*
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* @par List of Functions:
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* - isvcd_init_cabac_contexts()
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*
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* @remarks
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* None
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*
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*******************************************************************************
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*/
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#include <string.h>
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#include "ih264_typedefs.h"
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#include "ih264_macros.h"
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#include "ih264_platform_macros.h"
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#include "isvcd_structs.h"
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#include "ih264d_cabac.h"
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#include "isvcd_cabac.h"
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#include "ih264d_bitstrm.h"
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#include "ih264d_error_handler.h"
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#include "ih264d_defs.h"
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#include "ih264d_debug.h"
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#include "ih264d_tables.h"
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#include "isvcd_tables.h"
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#include "ih264d_parse_cabac.h"
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#include "ih264d_tables.h"
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/*****************************************************************************/
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/* */
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/* Function Name : isvcd_init_cabac_contexts */
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/* */
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/* Description : This function initializes the cabac contexts */
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/* depending upon slice type and Init_Idc value. */
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/* Inputs : ps_dec, slice type */
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/* Globals : <Does it use any global variables?> */
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/* Outputs : */
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/* Returns : void */
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/* */
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/* Issues : none */
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/* */
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/* Revision History: */
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/* */
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/* DD MM YYYY Author(s) Changes (Describe the changes made) */
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/* 06 09 2021 Kishore Draft */
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/* */
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/*****************************************************************************/
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void isvcd_init_cabac_contexts(UWORD8 u1_slice_type, dec_struct_t *ps_dec)
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{
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bin_ctxt_model_t *p_cabac_ctxt_table_t = ps_dec->p_cabac_ctxt_table_t;
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UWORD8 u1_qp_y = ps_dec->ps_cur_slice->u1_slice_qp;
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UWORD8 u1_cabac_init_Idc = 0;
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if(I_SLICE != u1_slice_type)
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{
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u1_cabac_init_Idc = ps_dec->ps_cur_slice->u1_cabac_init_idc;
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}
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{
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/* MAKING ps_dec->p_ctxt_inc_mb_map a scratch buffer */
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/* 0th entry of CtxtIncMbMap will be always be containing default values
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for CABAC context representing MB not available */
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ctxt_inc_mb_info_t *p_DefCtxt = ps_dec->p_ctxt_inc_mb_map - 1;
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UWORD8 *pu1_temp;
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WORD8 i;
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p_DefCtxt->u1_mb_type = CAB_SKIP;
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p_DefCtxt->u1_cbp = 0x0f;
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p_DefCtxt->u1_intra_chroma_pred_mode = 0;
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p_DefCtxt->u1_yuv_dc_csbp = 0x7;
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p_DefCtxt->u1_transform8x8_ctxt = 0;
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pu1_temp = (UWORD8 *) p_DefCtxt->i1_ref_idx;
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for(i = 0; i < 4; i++, pu1_temp++) (*pu1_temp) = 0;
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pu1_temp = (UWORD8 *) p_DefCtxt->u1_mv;
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for(i = 0; i < 16; i++, pu1_temp++) (*pu1_temp) = 0;
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ps_dec->ps_def_ctxt_mb_info = p_DefCtxt;
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}
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if(u1_slice_type == I_SLICE)
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{
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u1_cabac_init_Idc = 3;
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ps_dec->p_mb_type_t = p_cabac_ctxt_table_t + MB_TYPE_I_SLICE;
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}
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else if(u1_slice_type == P_SLICE)
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{
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ps_dec->p_mb_type_t = p_cabac_ctxt_table_t + MB_TYPE_P_SLICE;
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ps_dec->p_mb_skip_flag_t = p_cabac_ctxt_table_t + MB_SKIP_FLAG_P_SLICE;
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ps_dec->p_sub_mb_type_t = p_cabac_ctxt_table_t + SUB_MB_TYPE_P_SLICE;
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}
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else if(u1_slice_type == B_SLICE)
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{
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ps_dec->p_mb_type_t = p_cabac_ctxt_table_t + MB_TYPE_B_SLICE;
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ps_dec->p_mb_skip_flag_t = p_cabac_ctxt_table_t + MB_SKIP_FLAG_B_SLICE;
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ps_dec->p_sub_mb_type_t = p_cabac_ctxt_table_t + SUB_MB_TYPE_B_SLICE;
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}
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{
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bin_ctxt_model_t *p_cabac_ctxt_table_t_tmp = p_cabac_ctxt_table_t;
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if(ps_dec->ps_cur_slice->u1_field_pic_flag)
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{
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p_cabac_ctxt_table_t_tmp += SIGNIFICANT_COEFF_FLAG_FLD;
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}
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else
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{
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p_cabac_ctxt_table_t_tmp += SIGNIFICANT_COEFF_FLAG_FRAME;
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}
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{
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bin_ctxt_model_t **p_significant_coeff_flag_t = ps_dec->p_significant_coeff_flag_t;
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p_significant_coeff_flag_t[0] = p_cabac_ctxt_table_t_tmp + SIG_COEFF_CTXT_CAT_0_OFFSET;
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p_significant_coeff_flag_t[1] = p_cabac_ctxt_table_t_tmp + SIG_COEFF_CTXT_CAT_1_OFFSET;
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p_significant_coeff_flag_t[2] = p_cabac_ctxt_table_t_tmp + SIG_COEFF_CTXT_CAT_2_OFFSET;
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p_significant_coeff_flag_t[3] = p_cabac_ctxt_table_t_tmp + SIG_COEFF_CTXT_CAT_3_OFFSET;
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p_significant_coeff_flag_t[4] = p_cabac_ctxt_table_t_tmp + SIG_COEFF_CTXT_CAT_4_OFFSET;
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p_significant_coeff_flag_t[5] = p_cabac_ctxt_table_t_tmp + SIG_COEFF_CTXT_CAT_5_OFFSET;
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}
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}
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memcpy(p_cabac_ctxt_table_t, gau1_isvcd_cabac_ctxt_init_table[u1_cabac_init_Idc][u1_qp_y],
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NUM_CABAC_CTXTS_SVC * sizeof(bin_ctxt_model_t));
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}
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