/******************************************************************************
*
* 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 ih264d_parse_mb_header.c
*
* \brief
* This file contains context identifier encoding routines.
*
* \date
* 04/02/2003
*
* \author NS
***************************************************************************
*/
#include <string.h>
#include "ih264d_structs.h"
#include "ih264d_bitstrm.h"
#include "ih264d_cabac.h"
#include "ih264_typedefs.h"
#include "ih264_macros.h"
#include "ih264_platform_macros.h"
#include "ih264d_defs.h"
#include "ih264d_error_handler.h"
#include "ih264d_tables.h"
#include "ih264d_debug.h"
#include "ih264d_defs.h"
#include "ih264d_defs.h"
#include "ih264d_mb_utils.h"
#include "ih264d_parse_mb_header.h"
#include "ih264d_defs.h"
/*! < CtxtInc index 0 - CtxMbTypeI, CtxMbTypeSISuffix
index 1 - CtxMbTypePSuffix, CtxMbTypeBSuffix
*/
/*!
**************************************************************************
* \if Function name : ih264d_parse_mb_type_intra_cabac \endif
*
* \brief
* This function decodes MB type using CABAC entropy coding mode.
*
* \return
* MBType.
*
**************************************************************************
*/
UWORD8 ih264d_parse_mb_type_intra_cabac(UWORD8 u1_inter,
struct _DecStruct * ps_dec)
{
decoding_envirnoment_t * ps_cab_env = &ps_dec->s_cab_dec_env;
dec_bit_stream_t * ps_bitstrm = ps_dec->ps_bitstrm;
ctxt_inc_mb_info_t * ps_left_ctxt = ps_dec->p_left_ctxt_mb_info;
ctxt_inc_mb_info_t * ps_top_ctxt = ps_dec->p_top_ctxt_mb_info;
bin_ctxt_model_t *ps_mb_bin_ctxt = ps_dec->p_mb_type_t;
WORD8 u1_mb_type, u1_bin;
UWORD32 u4_cxt_inc;
u4_cxt_inc = 0;
if(!u1_inter)
{
if(ps_left_ctxt != ps_dec->ps_def_ctxt_mb_info)
u4_cxt_inc += ((ps_left_ctxt->u1_mb_type != CAB_I4x4) ? 1 : 0);
if(ps_top_ctxt != ps_dec->ps_def_ctxt_mb_info)
u4_cxt_inc += ((ps_top_ctxt->u1_mb_type != CAB_I4x4) ? 1 : 0);
}
else
{
ps_mb_bin_ctxt = ps_mb_bin_ctxt + 3 + (ps_dec->u1_B << 1);
}
/* b0 */
u1_mb_type = (UWORD8)ih264d_decode_bin(u4_cxt_inc, ps_mb_bin_ctxt, ps_bitstrm,
ps_cab_env);
if(u1_mb_type)
{
/* I16x16 or I_PCM mode */
/* b1 */
u1_bin = ih264d_decode_terminate(ps_cab_env, ps_bitstrm);
if(u1_bin == 0)
{
/* I16x16 mode */
/* Read b2 and b3 */
u4_cxt_inc = (u1_inter) ? 0x021 : 0x043;
u1_bin = ih264d_decode_bins(2, u4_cxt_inc, ps_mb_bin_ctxt, ps_bitstrm,
ps_cab_env);
if(u1_bin & 0x01)
u1_mb_type += 4;
if(u1_bin & 0x02)
u1_mb_type += 12;
if(u1_bin & 0x01)
{
/* since b3=1, Read three bins */
u4_cxt_inc = (u1_inter) ? 0x0332 : 0x0765;
u1_bin = (UWORD8)ih264d_decode_bins(3, u4_cxt_inc, ps_mb_bin_ctxt,
ps_bitstrm, ps_cab_env);
}
else
{
/* Read two bins */
u4_cxt_inc = (u1_inter) ? 0x033 : 0x076;
u1_bin = (UWORD8)ih264d_decode_bins(2, u4_cxt_inc, ps_mb_bin_ctxt,
ps_bitstrm, ps_cab_env);
}
u1_mb_type += u1_bin;
}
else
{
/* I_PCM mode */
/* b1=1 */
u1_mb_type = 25;
}
}
return (u1_mb_type);
}
/*!
**************************************************************************
* \if Function name : ih264d_parse_mb_type_cabac \endif
*
* \brief
* This function decodes MB type using CABAC entropy coding mode.
*
* \return
* MBType.
*
**************************************************************************
*/
UWORD32 ih264d_parse_mb_type_cabac(struct _DecStruct * ps_dec)
{
const UWORD8 uc_slice_type = ps_dec->ps_cur_slice->u1_slice_type;
decoding_envirnoment_t *ps_cab_env = &ps_dec->s_cab_dec_env;
dec_bit_stream_t *ps_bitstrm = ps_dec->ps_bitstrm;
ctxt_inc_mb_info_t *ps_left_ctxt = ps_dec->p_left_ctxt_mb_info;
ctxt_inc_mb_info_t *ps_top_ctxt = ps_dec->p_top_ctxt_mb_info;
WORD8 c_ctxt_inc;
bin_ctxt_model_t *ps_mb_bin_ctxt = ps_dec->p_mb_type_t;
WORD8 u1_mb_type = 0, u1_bin;
UWORD32 u4_cxt_inc;
INC_SYM_COUNT(ps_cab_env);
c_ctxt_inc = 0;
if(uc_slice_type == SI_SLICE)
{
/* b0 */
if(ps_left_ctxt != ps_dec->ps_def_ctxt_mb_info)
c_ctxt_inc += ((ps_left_ctxt->u1_mb_type != CAB_SI4x4) ? 1 : 0);
if(ps_top_ctxt != ps_dec->ps_def_ctxt_mb_info)
c_ctxt_inc += ((ps_top_ctxt->u1_mb_type != CAB_SI4x4) ? 1 : 0);
u4_cxt_inc = c_ctxt_inc;
u1_bin = (UWORD8)ih264d_decode_bin(u4_cxt_inc, ps_mb_bin_ctxt, ps_bitstrm,
ps_cab_env);
if(u1_bin == 0)
{
/* SI MB */
u1_mb_type = 0;
}
else
{
u1_mb_type = 1 + ih264d_parse_mb_type_intra_cabac(0, ps_dec);
}
}
else if(uc_slice_type == P_SLICE)
{
/* P Slice */
/* b0 */
u4_cxt_inc = 0;
u1_bin = (UWORD8)ih264d_decode_bin(u4_cxt_inc, ps_mb_bin_ctxt, ps_bitstrm,
ps_cab_env);
if(!u1_bin)
{
/* Inter MB types */
/* b1 */
u4_cxt_inc = 0x01;
u1_bin = (UWORD8)ih264d_decode_bin(u4_cxt_inc, ps_mb_bin_ctxt,
ps_bitstrm, ps_cab_env);
/* b2 */
u4_cxt_inc = u1_bin + 2;
u1_mb_type = (UWORD8)ih264d_decode_bin(u4_cxt_inc, ps_mb_bin_ctxt,
ps_bitstrm, ps_cab_env);
u1_mb_type = (u1_bin << 1) + u1_mb_type;
if(u1_mb_type)
u1_mb_type = 4 - u1_mb_type;
}
else
{
/* Intra Prefix 1 found */
/* Intra MB type */
u1_mb_type = 5 + ih264d_parse_mb_type_intra_cabac(1, ps_dec);
}
}
else if(uc_slice_type == B_SLICE)
{
WORD8 a, b;
/* B Slice */
/* b0 */
/* a = b = 0, if B slice and MB is a SKIP or B_DIRECT16x16 */
a = 0;
b = 0;
u1_mb_type = 0;
if(ps_left_ctxt != ps_dec->ps_def_ctxt_mb_info)
a = ((ps_left_ctxt->u1_mb_type & CAB_BD16x16_MASK) != CAB_BD16x16);
if(ps_top_ctxt != ps_dec->ps_def_ctxt_mb_info)
b = ((ps_top_ctxt->u1_mb_type & CAB_BD16x16_MASK) != CAB_BD16x16);
u4_cxt_inc = a + b;
u1_bin = (UWORD8)ih264d_decode_bin(u4_cxt_inc, ps_mb_bin_ctxt, ps_bitstrm,
ps_cab_env);
if(u1_bin)
{
/* b1 */
u4_cxt_inc = 0x03;
u1_bin = (UWORD8)ih264d_decode_bin(u4_cxt_inc, ps_mb_bin_ctxt,
ps_bitstrm, ps_cab_env);
if(!u1_bin)
{
/* b2 */
u4_cxt_inc = 0x05;
u1_bin = (UWORD8)ih264d_decode_bin(u4_cxt_inc, ps_mb_bin_ctxt,
ps_bitstrm, ps_cab_env);
u1_mb_type = u1_bin + 1;
}
else
{
u1_mb_type = 3;
/* b2 */
u4_cxt_inc = 0x04;
u1_bin = (UWORD8)ih264d_decode_bin(u4_cxt_inc, ps_mb_bin_ctxt,
ps_bitstrm, ps_cab_env);
if(u1_bin)
{
u1_mb_type += 8;
/* b3 */
u4_cxt_inc = 0x05;
u1_bin = (UWORD8)ih264d_decode_bin(u4_cxt_inc, ps_mb_bin_ctxt,
ps_bitstrm, ps_cab_env);
if(!u1_bin)
{
u1_mb_type++;
/* b4, b5, b6 */
u4_cxt_inc = 0x0555;
u1_bin = (UWORD8)ih264d_decode_bins(3, u4_cxt_inc,
ps_mb_bin_ctxt,
ps_bitstrm,
ps_cab_env);
u1_mb_type += u1_bin;
}
else
{
/* b4 */
u4_cxt_inc = 0x05;
u1_bin = (UWORD8)ih264d_decode_bin(u4_cxt_inc,
ps_mb_bin_ctxt,
ps_bitstrm,
ps_cab_env);
if(u1_bin)
{
/* b5 */
u1_bin = (UWORD8)ih264d_decode_bin(u4_cxt_inc,
ps_mb_bin_ctxt,
ps_bitstrm,
ps_cab_env);
u1_mb_type += (u1_bin ? 11 : 0);
}
else
{
u1_mb_type = 20;
/* b5 */
u1_bin = (UWORD8)ih264d_decode_bin(u4_cxt_inc,
ps_mb_bin_ctxt,
ps_bitstrm,
ps_cab_env);
if(!u1_bin)
{
/* b6 */
u1_bin = (UWORD8)ih264d_decode_bin(u4_cxt_inc,
ps_mb_bin_ctxt,
ps_bitstrm,
ps_cab_env);
u1_mb_type += u1_bin;
}
else
{
/* Intra Prefix 111101 found */
/* Intra MB type */
u1_mb_type =
23
+ ih264d_parse_mb_type_intra_cabac(
1,
ps_dec);
}
}
}
}
else
{
/* b3, b4, b5 */
u4_cxt_inc = 0x0555;
u1_bin = (UWORD8)ih264d_decode_bins(3, u4_cxt_inc,
ps_mb_bin_ctxt, ps_bitstrm,
ps_cab_env);
u1_mb_type += u1_bin;
}
}
}
}
return ((UWORD32)u1_mb_type);
}
/*!
**************************************************************************
* \if Function name : DecSubMBType \endif
*
* \brief
* This function decodes MB type using CABAC entropy coding mode.
*
* \return
* MBType.
*
**************************************************************************
*/
UWORD32 ih264d_parse_submb_type_cabac(const UWORD8 u1_slc_type_b,
decoding_envirnoment_t * ps_cab_env,
dec_bit_stream_t * ps_bitstrm,
bin_ctxt_model_t * ps_sub_mb_cxt)
{
WORD8 u1_sub_mb_type, u1_bin;
INC_SYM_COUNT(ps_cab_env);
u1_sub_mb_type = 0;
u1_bin = (UWORD8)ih264d_decode_bin(0, ps_sub_mb_cxt, ps_bitstrm,
ps_cab_env);
if(u1_slc_type_b ^ u1_bin)
return 0;
if(!u1_slc_type_b)
{
/* P Slice */
u1_sub_mb_type = 1;
u1_bin = (UWORD8)ih264d_decode_bin(1, ps_sub_mb_cxt, ps_bitstrm,
ps_cab_env);
if(u1_bin == 1)
{
u1_bin = (UWORD8)ih264d_decode_bin(2, ps_sub_mb_cxt, ps_bitstrm,
ps_cab_env);
u1_sub_mb_type = (2 + (!u1_bin));
}
return u1_sub_mb_type;
}
else
{
/* B Slice */
/* b1 */
u1_bin = (UWORD8)ih264d_decode_bin(1, ps_sub_mb_cxt, ps_bitstrm,
ps_cab_env);
if(u1_bin)
{
/* b2 */
u1_bin = (UWORD8)ih264d_decode_bin(2, ps_sub_mb_cxt, ps_bitstrm,
ps_cab_env);
if(u1_bin)
{
/* b3 */
u1_sub_mb_type = 7;
u1_bin = (UWORD8)ih264d_decode_bin(3, ps_sub_mb_cxt, ps_bitstrm,
ps_cab_env);
u1_sub_mb_type += u1_bin << 2;
u1_bin = !u1_bin;
/* b4 */
if(u1_bin == 0)
{
u1_bin = ih264d_decode_bin(3, ps_sub_mb_cxt, ps_bitstrm,
ps_cab_env);
}
else
{
u1_bin = (UWORD8)ih264d_decode_bins(2, 0x33, ps_sub_mb_cxt,
ps_bitstrm, ps_cab_env);
}
return (u1_sub_mb_type + u1_bin);
}
else
{
/* b3 */
u1_bin = (UWORD8)ih264d_decode_bins(2, 0x33, ps_sub_mb_cxt,
ps_bitstrm, ps_cab_env);
return (3 + u1_bin);
}
}
else
{
/* b2 */
u1_bin = (UWORD8)ih264d_decode_bin(3, ps_sub_mb_cxt, ps_bitstrm,
ps_cab_env);
return (1 + u1_bin);
}
}
}
/*!
**************************************************************************
* \if Function name : ih264d_parse_ref_idx_cabac \endif
*
* \brief
* This function decodes Reference Index using CABAC entropy coding mode.
*
* \return
* None
*
**************************************************************************
*/
WORD32 ih264d_parse_ref_idx_cabac(const UWORD8 u1_num_part,
const UWORD8 u1_b2,
const UWORD8 u1_max_ref_minus1,
const UWORD8 u1_mb_mode,
WORD8 * pi1_ref_idx,
WORD8 * const pi1_lft_cxt,
WORD8 * const pi1_top_cxt,
decoding_envirnoment_t * const ps_cab_env,
dec_bit_stream_t * const ps_bitstrm,
bin_ctxt_model_t * const ps_ref_cxt)
{
UWORD8 u1_a, u1_b;
UWORD32 u4_cxt_inc;
UWORD8 u1_blk_no, u1_i, u1_idx_lft, u1_idx_top;
WORD8 i1_ref_idx;
for(u1_blk_no = 0, u1_i = 0; u1_i < u1_num_part; u1_i++, pi1_ref_idx++)
{
u1_idx_lft = ((u1_blk_no & 0x02) >> 1) + u1_b2;
u1_idx_top = (u1_blk_no & 0x01) + u1_b2;
i1_ref_idx = *pi1_ref_idx;
if(i1_ref_idx > 0)
{
u1_a = pi1_lft_cxt[u1_idx_lft] > 0;
u1_b = pi1_top_cxt[u1_idx_top] > 0;
u4_cxt_inc = u1_a + (u1_b << 1);
u4_cxt_inc = (u4_cxt_inc | 0x55540);
i1_ref_idx = (WORD8)ih264d_decode_bins_unary(32, u4_cxt_inc,
ps_ref_cxt, ps_bitstrm,
ps_cab_env);
if((i1_ref_idx > u1_max_ref_minus1) || (i1_ref_idx < 0))
{
return ERROR_REF_IDX;
}
*pi1_ref_idx = i1_ref_idx;
INC_SYM_COUNT(ps_cab_env);
}
/* Storing Reference Idx Information */
pi1_lft_cxt[u1_idx_lft] = i1_ref_idx;
pi1_top_cxt[u1_idx_top] = i1_ref_idx;
u1_blk_no = u1_blk_no + 1 + (u1_mb_mode & 0x01);
}
/* if(!u1_sub_mb) */
if(u1_num_part != 4)
{
pi1_lft_cxt[(!(u1_mb_mode & 0x1)) + u1_b2] = pi1_lft_cxt[u1_b2];
pi1_top_cxt[(!(u1_mb_mode & 0x2)) + u1_b2] = pi1_top_cxt[u1_b2];
}
return OK;
}
/*!
**************************************************************************
* \if Function name : ih264d_parse_mb_qp_delta_cabac \endif
*
* \brief
* This function decodes MB Qp delta using CABAC entropy coding mode.
*
* \return
* None
*
**************************************************************************
*/
WORD32 ih264d_parse_mb_qp_delta_cabac(struct _DecStruct * ps_dec,
WORD8 *pi1_mb_qp_delta)
{
decoding_envirnoment_t * ps_cab_env = &ps_dec->s_cab_dec_env;
dec_bit_stream_t * ps_bitstrm = ps_dec->ps_bitstrm;
UWORD8 u1_code_num;
bin_ctxt_model_t *ps_mb_qp_delta_ctxt = ps_dec->p_mb_qp_delta_t;
UWORD32 u4_cxt_inc;
INC_SYM_COUNT(ps_cab_env);
u4_cxt_inc = (!(!(ps_dec->i1_prev_mb_qp_delta)));
u1_code_num = 0;
u4_cxt_inc = (u4_cxt_inc | 0x33320);
/* max number of bins = 53,
since Range for MbQpDelta= -26 to +25 inclusive, UNARY code */
u1_code_num = ih264d_decode_bins_unary(32, u4_cxt_inc, ps_mb_qp_delta_ctxt,
ps_bitstrm, ps_cab_env);
if(u1_code_num == 32)
{
/* Read remaining 21 bins */
UWORD8 uc_codeNumX;
u4_cxt_inc = 0x33333;
uc_codeNumX = ih264d_decode_bins_unary(21, u4_cxt_inc, ps_mb_qp_delta_ctxt,
ps_bitstrm, ps_cab_env);
u1_code_num = u1_code_num + uc_codeNumX;
}
*pi1_mb_qp_delta = (u1_code_num + 1) >> 1;
/* Table 9.3: If code_num is even Syntax Element has -ve value */
if(!(u1_code_num & 0x01))
*pi1_mb_qp_delta = -(*pi1_mb_qp_delta);
/* Range of MbQpDelta= -26 to +25 inclusive */
if((*pi1_mb_qp_delta < -26) || (*pi1_mb_qp_delta > 25))
return ERROR_INV_RANGE_QP_T;
ps_dec->i1_prev_mb_qp_delta = *pi1_mb_qp_delta;
return OK;
}
/*!
**************************************************************************
* \if Function name : ih264d_parse_chroma_pred_mode_cabac \endif
*
* \brief
* This function decodes Chroma Pred mode using CABAC entropy coding mode.
*
* \return
* None
*
**************************************************************************
*/
WORD8 ih264d_parse_chroma_pred_mode_cabac(struct _DecStruct * ps_dec)
{
decoding_envirnoment_t * ps_cab_env = &ps_dec->s_cab_dec_env;
dec_bit_stream_t * ps_bitstrm = ps_dec->ps_bitstrm;
ctxt_inc_mb_info_t * ps_left_ctxt = ps_dec->p_left_ctxt_mb_info;
ctxt_inc_mb_info_t * ps_top_ctxt = ps_dec->p_top_ctxt_mb_info;
WORD8 i1_chroma_pred_mode, a, b;
UWORD32 u4_cxt_inc;
INC_SYM_COUNT(ps_cab_env);
/* Binarization is TU and Cmax=3 */
i1_chroma_pred_mode = 0;
a = 0;
b = 0;
a = ((ps_left_ctxt->u1_intra_chroma_pred_mode != 0) ? 1 : 0);
b = ((ps_top_ctxt->u1_intra_chroma_pred_mode != 0) ? 1 : 0);
u4_cxt_inc = a + b;
u4_cxt_inc = (u4_cxt_inc | 0x330);
i1_chroma_pred_mode = ih264d_decode_bins_tunary(
3, u4_cxt_inc, ps_dec->p_intra_chroma_pred_mode_t,
ps_bitstrm, ps_cab_env);
return (i1_chroma_pred_mode);
}
/*****************************************************************************/
/* */
/* Function Name : ih264d_parse_transform8x8flag_cabac */
/* */
/* Description : */
/* Inputs : */
/* */
/* */
/* Returns : */
/* */
/* Revision History: */
/* */
/* DD MM YYYY Author(s) Changes (Describe the changes made) */
/* Rajasekhar Creation */
/* */
/*****************************************************************************/
UWORD8 ih264d_parse_transform8x8flag_cabac(struct _DecStruct * ps_dec,
dec_mb_info_t * ps_cur_mb_info)
{
decoding_envirnoment_t * ps_cab_env = &ps_dec->s_cab_dec_env;
dec_bit_stream_t * ps_bitstrm = ps_dec->ps_bitstrm;
ctxt_inc_mb_info_t * ps_left_ctxt = ps_dec->p_left_ctxt_mb_info;
ctxt_inc_mb_info_t * ps_top_ctxt = ps_dec->p_top_ctxt_mb_info;
UWORD8 u1_transform_8x8flag;
UWORD8 u1_mb_ngbr_avail = ps_cur_mb_info->u1_mb_ngbr_availablity;
WORD8 a, b;
UWORD32 u4_cxt_inc;
/* for calculating the context increment for transform8x8 u4_flag */
/* it reads transform8x8 u4_flag of the neighbors through */
/* Binarization is FLC */
a = 0;
b = 0;
if(u1_mb_ngbr_avail & LEFT_MB_AVAILABLE_MASK)
{
a = ps_left_ctxt->u1_transform8x8_ctxt;
}
if(u1_mb_ngbr_avail & TOP_MB_AVAILABLE_MASK)
{
b = ps_top_ctxt->u1_transform8x8_ctxt;
}
u4_cxt_inc = a + b;
u1_transform_8x8flag = ih264d_decode_bin(
u4_cxt_inc, ps_dec->s_high_profile.ps_transform8x8_flag,
ps_bitstrm, ps_cab_env);
return (u1_transform_8x8flag);
}
/*!
**************************************************************************
* \if Function name : ih264d_read_intra_pred_modes_cabac \endif
*
* \brief
* Reads the intra pred mode related values of I4x4 MB from bitstream.
*
* This function will read the prev intra pred mode flags and
* stores it in pu1_prev_intra4x4_pred_mode_flag. If the u4_flag
* indicates that most probable mode is not intra pred mode, then
* the rem_intra4x4_pred_mode is read and stored in
* pu1_rem_intra4x4_pred_mode array.
*
*
* \return
* 0 on success and Error code otherwise
*
**************************************************************************
*/
WORD32 ih264d_read_intra_pred_modes_cabac(dec_struct_t * ps_dec,
UWORD8 * pu1_prev_intra4x4_pred_mode_flag,
UWORD8 * pu1_rem_intra4x4_pred_mode,
UWORD8 u1_tran_form8x8)
{
WORD32 i4x4_luma_blk_idx = 0;
dec_bit_stream_t * ps_bitstrm = ps_dec->ps_bitstrm;
decoding_envirnoment_t * ps_cab_env = &ps_dec->s_cab_dec_env;
bin_ctxt_model_t *ps_ctxt_ipred_luma_mpm, *ps_ctx_ipred_luma_rm;
WORD32 i4_rem_intra4x4_pred_mode;
UWORD32 u4_prev_intra4x4_pred_mode_flag;
UWORD32 u4_code_int_range, u4_code_int_val_ofst;
const UWORD32 *pu4_table = (const UWORD32 *)ps_cab_env->cabac_table;
ps_ctxt_ipred_luma_mpm = ps_dec->p_prev_intra4x4_pred_mode_flag_t;
ps_ctx_ipred_luma_rm = ps_dec->p_rem_intra4x4_pred_mode_t;
SWITCHOFFTRACE;
i4x4_luma_blk_idx = (0 == u1_tran_form8x8) ? 16 : 4;
u4_code_int_range = ps_cab_env->u4_code_int_range;
u4_code_int_val_ofst = ps_cab_env->u4_code_int_val_ofst;
do
{
DECODE_ONE_BIN_MACRO(ps_ctxt_ipred_luma_mpm, u4_code_int_range,
u4_code_int_val_ofst, pu4_table, ps_bitstrm,
u4_prev_intra4x4_pred_mode_flag)
*pu1_prev_intra4x4_pred_mode_flag = u4_prev_intra4x4_pred_mode_flag;
i4_rem_intra4x4_pred_mode = -1;
if(!u4_prev_intra4x4_pred_mode_flag)
{
/*inlining DecodeDecisionBins_FLC*/
{
UWORD8 u1_max_bins = 3;
UWORD32 u4_value;
UWORD32 u4_symbol, i;
i = 0;
u4_value = 0;
do
{
DECODE_ONE_BIN_MACRO(ps_ctx_ipred_luma_rm, u4_code_int_range,
u4_code_int_val_ofst, pu4_table,
ps_bitstrm, u4_symbol)
INC_BIN_COUNT(ps_cab_env);INC_DECISION_BINS(ps_cab_env);
u4_value = u4_value | (u4_symbol << i);
i++;
}
while(i < u1_max_bins);
i4_rem_intra4x4_pred_mode = (u4_value);
}
}
(*pu1_rem_intra4x4_pred_mode) = i4_rem_intra4x4_pred_mode;
COPYTHECONTEXT("intra4x4_pred_mode", i4_rem_intra4x4_pred_mode);
pu1_prev_intra4x4_pred_mode_flag++;
pu1_rem_intra4x4_pred_mode++;
i4x4_luma_blk_idx--;
}
while(i4x4_luma_blk_idx);
ps_cab_env->u4_code_int_range = u4_code_int_range;
ps_cab_env->u4_code_int_val_ofst = u4_code_int_val_ofst;
return (0);
}
/*!
**************************************************************************
* \if Function name : ih264d_parse_ctx_cbp_cabac \endif
*
* \brief
* This function decodes CtxCbpLuma and CtxCbpChroma (CBP of a Macroblock).
* using CABAC entropy coding mode.
*
* \return
* CBP of a MB.
*
**************************************************************************
*/
UWORD32 ih264d_parse_ctx_cbp_cabac(struct _DecStruct * ps_dec)
{
UWORD32 u4_cxt_inc;
decoding_envirnoment_t * ps_cab_env = &ps_dec->s_cab_dec_env;
dec_bit_stream_t * ps_bitstrm = ps_dec->ps_bitstrm;
ctxt_inc_mb_info_t * ps_left_ctxt = ps_dec->p_left_ctxt_mb_info;
ctxt_inc_mb_info_t * ps_top_ctxt = ps_dec->p_top_ctxt_mb_info;
bin_ctxt_model_t *ps_ctxt_cbp_luma = ps_dec->p_cbp_luma_t, *ps_bin_ctxt;
WORD8 c_Cbp; //,i,j;
UWORD32 u4_code_int_range, u4_code_int_val_ofst;
UWORD32 u4_offset, *pu4_buffer;
const UWORD32 *pu4_table = (const UWORD32 *)ps_cab_env->cabac_table;
INC_SYM_COUNT(ps_cab_env);
/* CBP Luma, FL, Cmax = 15, L = 4 */
u4_cxt_inc = (!((ps_top_ctxt->u1_cbp >> 2) & 0x01)) << 1;
u4_cxt_inc += !((ps_left_ctxt->u1_cbp >> 1) & 0x01);
u4_offset = ps_bitstrm->u4_ofst;
pu4_buffer = ps_bitstrm->pu4_buffer;
u4_code_int_range = ps_cab_env->u4_code_int_range;
u4_code_int_val_ofst = ps_cab_env->u4_code_int_val_ofst;
/*renormalize to ensure there 23 bits more in the u4_code_int_val_ofst*/
{
UWORD32 u4_clz, read_bits;
u4_clz = CLZ(u4_code_int_range);
FLUSHBITS(u4_offset, u4_clz)
NEXTBITS(read_bits, u4_offset, pu4_buffer, 23)
u4_code_int_range = u4_code_int_range << u4_clz;
u4_code_int_val_ofst = (u4_code_int_val_ofst << u4_clz) | read_bits;
}
ps_bin_ctxt = ps_ctxt_cbp_luma + u4_cxt_inc;
/*inlining DecodeDecision_onebin without renorm*/
{
UWORD32 u4_qnt_int_range, u4_int_range_lps;
UWORD32 u4_symbol, u1_mps_state;
UWORD32 table_lookup;
UWORD32 u4_clz;
u1_mps_state = (ps_bin_ctxt->u1_mps_state);
u4_clz = CLZ(u4_code_int_range);
u4_qnt_int_range = u4_code_int_range << u4_clz;
u4_qnt_int_range = (u4_qnt_int_range >> 29) & 0x3;
table_lookup = pu4_table[(u1_mps_state << 2) + u4_qnt_int_range];
u4_int_range_lps = table_lookup & 0xff;
u4_int_range_lps = u4_int_range_lps << (23 - u4_clz);
u4_code_int_range = u4_code_int_range - u4_int_range_lps;
u4_symbol = ((u1_mps_state >> 6) & 0x1);
/*if mps*/
u1_mps_state = (table_lookup >> 8) & 0x7F;
CHECK_IF_LPS(u4_code_int_range, u4_code_int_val_ofst, u4_symbol,
u4_int_range_lps, u1_mps_state, table_lookup)
INC_BIN_COUNT(ps_cab_env);
ps_bin_ctxt->u1_mps_state = u1_mps_state;
c_Cbp = u4_symbol;
}
u4_cxt_inc = (!((ps_top_ctxt->u1_cbp >> 3) & 0x01)) << 1;
u4_cxt_inc += !(c_Cbp & 0x01);
ps_bin_ctxt = ps_ctxt_cbp_luma + u4_cxt_inc;
/*inlining DecodeDecision_onebin without renorm*/
{
UWORD32 u4_qnt_int_range, u4_int_range_lps;
UWORD32 u4_symbol, u1_mps_state;
UWORD32 table_lookup;
UWORD32 u4_clz;
u1_mps_state = (ps_bin_ctxt->u1_mps_state);
u4_clz = CLZ(u4_code_int_range);
u4_qnt_int_range = u4_code_int_range << u4_clz;
u4_qnt_int_range = (u4_qnt_int_range >> 29) & 0x3;
table_lookup = pu4_table[(u1_mps_state << 2) + u4_qnt_int_range];
u4_int_range_lps = table_lookup & 0xff;
u4_int_range_lps = u4_int_range_lps << (23 - u4_clz);
u4_code_int_range = u4_code_int_range - u4_int_range_lps;
u4_symbol = ((u1_mps_state >> 6) & 0x1);
/*if mps*/
u1_mps_state = (table_lookup >> 8) & 0x7F;
CHECK_IF_LPS(u4_code_int_range, u4_code_int_val_ofst, u4_symbol,
u4_int_range_lps, u1_mps_state, table_lookup)
INC_BIN_COUNT(ps_cab_env);
ps_bin_ctxt->u1_mps_state = u1_mps_state;
c_Cbp |= u4_symbol << 1;
}
u4_cxt_inc = (!(c_Cbp & 0x01)) << 1;
u4_cxt_inc += !((ps_left_ctxt->u1_cbp >> 3) & 0x01);
ps_bin_ctxt = ps_ctxt_cbp_luma + u4_cxt_inc;
/*inlining DecodeDecision_onebin without renorm*/
{
UWORD32 u4_qnt_int_range, u4_int_range_lps;
UWORD32 u4_symbol, u1_mps_state;
UWORD32 table_lookup;
UWORD32 u4_clz;
u1_mps_state = (ps_bin_ctxt->u1_mps_state);
u4_clz = CLZ(u4_code_int_range);
u4_qnt_int_range = u4_code_int_range << u4_clz;
u4_qnt_int_range = (u4_qnt_int_range >> 29) & 0x3;
table_lookup = pu4_table[(u1_mps_state << 2) + u4_qnt_int_range];
u4_int_range_lps = table_lookup & 0xff;
u4_int_range_lps = u4_int_range_lps << (23 - u4_clz);
u4_code_int_range = u4_code_int_range - u4_int_range_lps;
u4_symbol = ((u1_mps_state >> 6) & 0x1);
/*if mps*/
u1_mps_state = (table_lookup >> 8) & 0x7F;
CHECK_IF_LPS(u4_code_int_range, u4_code_int_val_ofst, u4_symbol,
u4_int_range_lps, u1_mps_state, table_lookup)
INC_BIN_COUNT(ps_cab_env);
ps_bin_ctxt->u1_mps_state = u1_mps_state;
c_Cbp |= u4_symbol << 2;
}
u4_cxt_inc = (!((c_Cbp >> 1) & 0x01)) << 1;
u4_cxt_inc += !((c_Cbp >> 2) & 0x01);
ps_bin_ctxt = ps_ctxt_cbp_luma + u4_cxt_inc;
/*inlining DecodeDecision_onebin without renorm*/
{
UWORD32 u4_qnt_int_range, u4_int_range_lps;
UWORD32 u4_symbol, u1_mps_state;
UWORD32 table_lookup;
UWORD32 u4_clz;
u1_mps_state = (ps_bin_ctxt->u1_mps_state);
u4_clz = CLZ(u4_code_int_range);
u4_qnt_int_range = u4_code_int_range << u4_clz;
u4_qnt_int_range = (u4_qnt_int_range >> 29) & 0x3;
table_lookup = pu4_table[(u1_mps_state << 2) + u4_qnt_int_range];
u4_int_range_lps = table_lookup & 0xff;
u4_int_range_lps = u4_int_range_lps << (23 - u4_clz);
u4_code_int_range = u4_code_int_range - u4_int_range_lps;
u4_symbol = ((u1_mps_state >> 6) & 0x1);
/*if mps*/
u1_mps_state = (table_lookup >> 8) & 0x7F;
CHECK_IF_LPS(u4_code_int_range, u4_code_int_val_ofst, u4_symbol,
u4_int_range_lps, u1_mps_state, table_lookup)
INC_BIN_COUNT(ps_cab_env);
ps_bin_ctxt->u1_mps_state = u1_mps_state;
c_Cbp |= u4_symbol << 3;
}
if(u4_code_int_range < ONE_RIGHT_SHIFTED_BY_8)
{
RENORM_RANGE_OFFSET(u4_code_int_range, u4_code_int_val_ofst, u4_offset,
pu4_buffer)
}
{
UWORD32 u4_cxt_inc;
WORD8 a, b, c, d;
bin_ctxt_model_t *p_CtxtCbpChroma = ps_dec->p_cbp_chroma_t;
/* CBP Chroma, TU, Cmax = 2 */
a = 0;
b = 0;
c = 0;
d = 0;
{
a = (ps_top_ctxt->u1_cbp > 15) ? 2 : 0;
c = (ps_top_ctxt->u1_cbp > 31) ? 2 : 0;
}
{
b = (ps_left_ctxt->u1_cbp > 15) ? 1 : 0;
d = (ps_left_ctxt->u1_cbp > 31) ? 1 : 0;
}
u4_cxt_inc = a + b;
u4_cxt_inc = (u4_cxt_inc | ((4 + c + d) << 4));
/*inlining ih264d_decode_bins_tunary */
{
UWORD8 u1_max_bins = 2;
UWORD32 u4_ctx_inc = u4_cxt_inc;
UWORD32 u4_value;
UWORD32 u4_symbol;
UWORD8 u4_ctx_Inc;
bin_ctxt_model_t *ps_bin_ctxt;
u4_value = 0;
do
{
u4_ctx_Inc = u4_ctx_inc & 0xF;
u4_ctx_inc = u4_ctx_inc >> 4;
ps_bin_ctxt = p_CtxtCbpChroma + u4_ctx_Inc;
/*inlining DecodeDecision_onebin*/
{
UWORD32 u4_qnt_int_range, u4_int_range_lps;
UWORD32 u1_mps_state;
UWORD32 table_lookup;
UWORD32 u4_clz;
u1_mps_state = (ps_bin_ctxt->u1_mps_state);
u4_clz = CLZ(u4_code_int_range);
u4_qnt_int_range = u4_code_int_range << u4_clz;
u4_qnt_int_range = (u4_qnt_int_range >> 29) & 0x3;
table_lookup = pu4_table[(u1_mps_state << 2)
+ u4_qnt_int_range];
u4_int_range_lps = table_lookup & 0xff;
u4_int_range_lps = u4_int_range_lps << (23 - u4_clz);
u4_code_int_range = u4_code_int_range - u4_int_range_lps;
u4_symbol = ((u1_mps_state >> 6) & 0x1);
/*if mps*/
u1_mps_state = (table_lookup >> 8) & 0x7F;
CHECK_IF_LPS(u4_code_int_range, u4_code_int_val_ofst,
u4_symbol, u4_int_range_lps, u1_mps_state,
table_lookup)
if(u4_code_int_range < ONE_RIGHT_SHIFTED_BY_8)
{
RENORM_RANGE_OFFSET(u4_code_int_range,
u4_code_int_val_ofst, u4_offset,
pu4_buffer)
}
ps_bin_ctxt->u1_mps_state = u1_mps_state;
}
INC_BIN_COUNT(ps_cab_env);INC_DECISION_BINS(
ps_cab_env);
u4_value++;
}
while((u4_value < u1_max_bins) & (u4_symbol));
u4_value = u4_value - 1 + u4_symbol;
a = (u4_value);
}
c_Cbp = (c_Cbp | (a << 4));
}
ps_bitstrm->u4_ofst = u4_offset;
ps_cab_env->u4_code_int_range = u4_code_int_range;
ps_cab_env->u4_code_int_val_ofst = u4_code_int_val_ofst;
return (c_Cbp);
}
/*!
**************************************************************************
* \if Function name : ih264d_get_mvd_cabac \endif
*
* \brief
* This function decodes Horz and Vert mvd_l0 and mvd_l1 using CABAC entropy
* coding mode as defined in 9.3.2.3.
*
* \return
* None
*
**************************************************************************
*/
void ih264d_get_mvd_cabac(UWORD8 u1_sub_mb,
UWORD8 u1_b2,
UWORD8 u1_part_wd,
UWORD8 u1_part_ht,
UWORD8 u1_dec_mvd,
dec_struct_t *ps_dec,
mv_pred_t *ps_mv)
{
UWORD8 u1_abs_mvd_x = 0, u1_abs_mvd_y = 0;
UWORD8 u1_sub_mb_x, u1_sub_mb_y;
UWORD8 *pu1_top_mv_ctxt, *pu1_lft_mv_ctxt;
WORD16 *pi2_mv;
u1_sub_mb_x = (UWORD8)(u1_sub_mb & 0x03);
u1_sub_mb_y = (UWORD8)(u1_sub_mb >> 2);
pu1_top_mv_ctxt = &ps_dec->ps_curr_ctxt_mb_info->u1_mv[u1_sub_mb_x][u1_b2];
pu1_lft_mv_ctxt = &ps_dec->pu1_left_mv_ctxt_inc[u1_sub_mb_y][u1_b2];
pi2_mv = &ps_mv->i2_mv[u1_b2];
if(u1_dec_mvd)
{
WORD16 i2_mv_x, i2_mv_y;
WORD32 i2_temp;
{
decoding_envirnoment_t * ps_cab_env = &ps_dec->s_cab_dec_env;
dec_bit_stream_t * ps_bitstrm = ps_dec->ps_bitstrm;
UWORD16 u2_abs_mvd_x_a, u2_abs_mvd_x_b, u2_abs_mvd_y_a,
u2_abs_mvd_y_b;
u2_abs_mvd_x_b = (UWORD16)pu1_top_mv_ctxt[0];
u2_abs_mvd_y_b = (UWORD16)pu1_top_mv_ctxt[1];
u2_abs_mvd_x_a = (UWORD16)pu1_lft_mv_ctxt[0];
u2_abs_mvd_y_a = (UWORD16)pu1_lft_mv_ctxt[1];
i2_temp = u2_abs_mvd_x_a + u2_abs_mvd_x_b;
i2_mv_x = ih264d_parse_mvd_cabac(ps_bitstrm, ps_cab_env,
ps_dec->p_mvd_x_t, i2_temp);
i2_temp = u2_abs_mvd_y_a + u2_abs_mvd_y_b;
i2_mv_y = ih264d_parse_mvd_cabac(ps_bitstrm, ps_cab_env,
ps_dec->p_mvd_y_t, i2_temp);
}
/***********************************************************************/
/* Store the abs_mvd_values in cabac contexts */
/* The follownig code can be easily optimzed if mvX, mvY clip values */
/* are packed in 16 bits follwed by memcpy */
/***********************************************************************/
u1_abs_mvd_x = CLIP3(0, 127, ABS(i2_mv_x));
u1_abs_mvd_y = CLIP3(0, 127, ABS(i2_mv_y));
COPYTHECONTEXT("MVD", i2_mv_x);COPYTHECONTEXT("MVD", i2_mv_y);
/* Storing Mv residuals */
pi2_mv[0] = i2_mv_x;
pi2_mv[1] = i2_mv_y;
}
/***************************************************************/
/* Store abs_mvd_values cabac contexts */
/***************************************************************/
{
UWORD8 u1_i;
for(u1_i = 0; u1_i < u1_part_wd; u1_i++, pu1_top_mv_ctxt += 4)
{
pu1_top_mv_ctxt[0] = u1_abs_mvd_x;
pu1_top_mv_ctxt[1] = u1_abs_mvd_y;
}
for(u1_i = 0; u1_i < u1_part_ht; u1_i++, pu1_lft_mv_ctxt += 4)
{
pu1_lft_mv_ctxt[0] = u1_abs_mvd_x;
pu1_lft_mv_ctxt[1] = u1_abs_mvd_y;
}
}
}
/*****************************************************************************/
/* */
/* Function Name : ih264d_parse_mvd_cabac */
/* */
/* Description : This cabac function decodes the mvd in a given direction */
/* direction ( x or y ) as defined in 9.3.2.3. */
/* */
/* Inputs : 1. pointer to Bitstream */
/* 2. pointer to cabac decoding environmnet */
/* 3. pointer to Mvd context */
/* 4. abs(Top mvd) = u2_abs_mvd_b */
/* 5. abs(left mvd)= u2_abs_mvd_a */
/* */
/* Processing : see section 9.3.2.3 of the standard */
/* */
/* Outputs : i2_mvd */
/* Returns : i2_mvd */
/* */
/* Issues : none */
/* */
/* Revision History: */
/* */
/* DD MM YYYY Author(s) Changes (Describe the changes made) */
/* 16 06 2005 Jay Draft */
/* */
/*****************************************************************************/
WORD16 ih264d_parse_mvd_cabac(dec_bit_stream_t * ps_bitstrm,
decoding_envirnoment_t * ps_cab_env,
bin_ctxt_model_t * p_ctxt_mvd,
UWORD32 i4_temp)
{
WORD8 k;
WORD16 i2_suf;
WORD16 i2_mvd;
UWORD16 u2_abs_mvd;
UWORD32 u4_ctx_inc;
UWORD32 u4_prefix;
const UWORD32 *pu4_table = (const UWORD32 *)ps_cab_env->cabac_table;
UWORD32 u4_code_int_range, u4_code_int_val_ofst;
/* if mvd < 9 */
/* mvd = Prefix */
/* else */
/* mvd = Prefix + Suffix */
/* decode sign bit */
/* Prefix TU decoding Cmax =Ucoff and Suffix 3rd order Exp-Golomb */
u2_abs_mvd = (UWORD16)i4_temp;
u4_ctx_inc = 1;
if(u2_abs_mvd < 3)
u4_ctx_inc = 0;
else if(u2_abs_mvd > 32)
u4_ctx_inc = 2;
u4_ctx_inc = (u4_ctx_inc | 0x65430);
/*inlining modified version of ih264d_decode_bins_unary*/
{
UWORD8 u1_max_bins = 9;
UWORD32 u4_value;
UWORD32 u4_symbol;
bin_ctxt_model_t *ps_bin_ctxt;
UWORD32 u4_ctx_Inc;
u4_value = 0;
u4_code_int_range = ps_cab_env->u4_code_int_range;
u4_code_int_val_ofst = ps_cab_env->u4_code_int_val_ofst;
do
{
u4_ctx_Inc = u4_ctx_inc & 0xf;
u4_ctx_inc = u4_ctx_inc >> 4;
ps_bin_ctxt = p_ctxt_mvd + u4_ctx_Inc;
DECODE_ONE_BIN_MACRO(ps_bin_ctxt, u4_code_int_range,
u4_code_int_val_ofst, pu4_table, ps_bitstrm,
u4_symbol)
INC_BIN_COUNT(ps_cab_env);INC_DECISION_BINS(ps_cab_env);
u4_value++;
}
while(u4_symbol && u4_value < 5);
ps_bin_ctxt = p_ctxt_mvd + 6;
if(u4_symbol && (u4_value < u1_max_bins))
{
do
{
DECODE_ONE_BIN_MACRO(ps_bin_ctxt, u4_code_int_range,
u4_code_int_val_ofst, pu4_table,
ps_bitstrm, u4_symbol)
INC_BIN_COUNT(ps_cab_env);INC_DECISION_BINS(ps_cab_env);
u4_value++;
}
while(u4_symbol && (u4_value < u1_max_bins));
}
ps_cab_env->u4_code_int_range = u4_code_int_range;
ps_cab_env->u4_code_int_val_ofst = u4_code_int_val_ofst;
u4_value = u4_value - 1 + u4_symbol;
u4_prefix = (u4_value);
}
i2_mvd = u4_prefix;
if(i2_mvd == 9)
{
/* Read Suffix */
k = ih264d_decode_bypass_bins_unary(ps_cab_env, ps_bitstrm);
i2_suf = (1 << k) - 1;
k = k + 3;
i2_suf = (i2_suf << 3);
i2_mvd += i2_suf;
i2_suf = ih264d_decode_bypass_bins(ps_cab_env, k, ps_bitstrm);
i2_mvd += i2_suf;
}
/* Read Sign bit */
if(!i2_mvd)
return (i2_mvd);
else
{
UWORD32 u4_code_int_val_ofst, u4_code_int_range;
u4_code_int_val_ofst = ps_cab_env->u4_code_int_val_ofst;
u4_code_int_range = ps_cab_env->u4_code_int_range;
if(u4_code_int_range < ONE_RIGHT_SHIFTED_BY_9)
{
UWORD32 *pu4_buffer, u4_offset;
pu4_buffer = ps_bitstrm->pu4_buffer;
u4_offset = ps_bitstrm->u4_ofst;
RENORM_RANGE_OFFSET(u4_code_int_range, u4_code_int_val_ofst,
u4_offset, pu4_buffer)
ps_bitstrm->u4_ofst = u4_offset;
}
u4_code_int_range = u4_code_int_range >> 1;
if(u4_code_int_val_ofst >= u4_code_int_range)
{
/* S=1 */
u4_code_int_val_ofst -= u4_code_int_range;
i2_mvd = (-i2_mvd);
}
ps_cab_env->u4_code_int_val_ofst = u4_code_int_val_ofst;
ps_cab_env->u4_code_int_range = u4_code_int_range;
return (i2_mvd);
}
}