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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_init.c
*
* @brief
* Contains all initialization functions for cabac contexts
*
* @author
* Doney Alex
*
* @par List of Functions:
*
*
* @remarks
* None
*
*******************************************************************************
*/
/*****************************************************************************/
/* File Includes */
/*****************************************************************************/
/* System include files */
#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <assert.h>
/* User include files */
#include "ih264_typedefs.h"
#include "iv2.h"
#include "ive2.h"
#include "ih264_defs.h"
#include "ih264_debug.h"
#include "ime_distortion_metrics.h"
#include "ime_defs.h"
#include "ime_structs.h"
#include "ih264_error.h"
#include "ih264_structs.h"
#include "ih264_trans_quant_itrans_iquant.h"
#include "ih264_inter_pred_filters.h"
#include "ih264_mem_fns.h"
#include "ih264_padding.h"
#include "ih264_intra_pred_filters.h"
#include "ih264_deblk_edge_filters.h"
#include "ih264_platform_macros.h"
#include "ih264_macros.h"
#include "ih264_buf_mgr.h"
#include "ih264e_error.h"
#include "ih264e_bitstream.h"
#include "ih264_common_tables.h"
#include "ih264_cabac_tables.h"
#include "ih264_list.h"
#include "ih264e_defs.h"
#include "irc_cntrl_param.h"
#include "irc_frame_info_collector.h"
#include "ih264e_rate_control.h"
#include "ih264e_cabac_structs.h"
#include "ih264e_structs.h"
#include "ih264e_cabac.h"
#include "ih264e_process.h"
#include "ithread.h"
#include "ih264e_intra_modes_eval.h"
#include "ih264e_encode_header.h"
#include "ih264e_globals.h"
#include "ih264e_config.h"
#include "ih264e_trace.h"
#include "ih264e_statistics.h"
#include "ih264_cavlc_tables.h"
#include "ih264e_deblk.h"
#include "ih264e_me.h"
#include "ih264e_debug.h"
#include "ih264e_master.h"
#include "ih264e_utils.h"
#include "irc_mem_req_and_acq.h"
#include "irc_rate_control_api.h"
#include "ih264e_platform_macros.h"
#include "ime_statistics.h"
/*****************************************************************************/
/* Function definitions . */
/*****************************************************************************/
/**
*******************************************************************************
*
* @brief
* Initialize cabac encoding environment
*
* @param[in] ps_cab_enc_env
* Pointer to encoding_envirnoment_t structure
*
* @returns
*
* @remarks
* None
*
*******************************************************************************
*/
static void ih264e_init_cabac_enc_envirnoment(encoding_envirnoment_t *ps_cab_enc_env)
{
ps_cab_enc_env->u4_code_int_low = 0;
ps_cab_enc_env->u4_code_int_range = 0x1fe;
ps_cab_enc_env->u4_out_standing_bytes = 0;
ps_cab_enc_env->u4_bits_gen = 0;
}
/**
*******************************************************************************
*
* @brief
* Initialize default context values and pointers (Called once at the beginning of encoding).
*
* @param[in] ps_ent_ctxt
* Pointer to entropy context structure
*
* @returns
*
* @remarks
* None
*
*******************************************************************************
*/
void ih264e_init_cabac_table(entropy_ctxt_t *ps_ent_ctxt)
{
/* CABAC context */
cabac_ctxt_t *ps_cabac_ctxt = ps_ent_ctxt->ps_cabac;
ps_cabac_ctxt->ps_mb_map_ctxt_inc = ps_cabac_ctxt->ps_mb_map_ctxt_inc_base + 1;
ps_cabac_ctxt->ps_lft_csbp = &ps_cabac_ctxt->s_lft_csbp;
ps_cabac_ctxt->ps_bitstrm = ps_ent_ctxt->ps_bitstrm;
{
/* 0th entry of mb_map_ctxt_inc will be always be containing default values */
/* for CABAC context representing MB not available */
mb_info_ctxt_t *ps_def_ctxt = ps_cabac_ctxt->ps_mb_map_ctxt_inc - 1;
UWORD32 *pu4_temp;
WORD8 i;
ps_def_ctxt->u1_mb_type = CAB_SKIP;
ps_def_ctxt->u1_cbp = 0x0f;
ps_def_ctxt->u1_intrapred_chroma_mode = 0;
pu4_temp = (UWORD32 *)ps_def_ctxt->i1_ref_idx;
pu4_temp[0] = 0;
pu4_temp = (UWORD32 *)ps_def_ctxt->u1_mv;
for (i = 0; i < 4; i++, pu4_temp++)
(*pu4_temp) = 0;
ps_cabac_ctxt->ps_def_ctxt_mb_info = ps_def_ctxt;
}
}
/**
*******************************************************************************
*
* @brief
* Initialize cabac context: Initialize all contest with init values given in the spec.
* Called at the beginning of entropy coding of each slice for CABAC encoding.
*
* @param[in] ps_ent_ctxt
* Pointer to entropy context structure
*
* @returns
*
* @remarks
* None
*
*******************************************************************************
*/
void ih264e_init_cabac_ctxt(entropy_ctxt_t *ps_ent_ctxt)
{
/* CABAC context */
cabac_ctxt_t *ps_cabac_ctxt = ps_ent_ctxt->ps_cabac;
/* slice header */
slice_header_t *ps_slice_hdr = ps_ent_ctxt->ps_slice_hdr_base;
const UWORD8 u1_slice_type = ps_slice_hdr->u1_slice_type;
WORD8 i1_cabac_init_idc = 0;
bin_ctxt_model *au1_cabac_ctxt_table = ps_cabac_ctxt->au1_cabac_ctxt_table;
UWORD8 u1_qp_y = ps_slice_hdr->i1_slice_qp;
ih264e_init_cabac_enc_envirnoment(&ps_cabac_ctxt->s_cab_enc_env);
ps_cabac_ctxt->i1_prevps_mb_qp_delta_ctxt = 0;
if (ISLICE != u1_slice_type)
{
i1_cabac_init_idc = ps_slice_hdr->i1_cabac_init_idc;
}
else
{
i1_cabac_init_idc = 3;
}
memcpy(au1_cabac_ctxt_table,
gau1_ih264_cabac_ctxt_init_table[i1_cabac_init_idc][u1_qp_y],
NUM_CABAC_CTXTS * sizeof(bin_ctxt_model));
}
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