xref: /aosp_15_r20/external/libavc/decoder/ih264d_parse_bslice.c (revision 495ae853bb871d1e5a258cb02c2cc13cde8ddb9a)

/******************************************************************************
 *
 * 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_bslice.c
 *
 * \brief
 *    Contains routines that decode a I slice type
 *
 * Detailed_description
 *
 * \date
 *    07/07/2003
 *
 * \author  NS
 **************************************************************************
 */

#include <string.h>
#include "ih264_defs.h"
#include "ih264d_bitstrm.h"
#include "ih264d_defs.h"
#include "ih264d_debug.h"
#include "ih264d_tables.h"
#include "ih264d_structs.h"
#include "ih264d_defs.h"
#include "ih264d_parse_cavlc.h"
#include "ih264d_mb_utils.h"
#include "ih264d_parse_slice.h"
#include "ih264d_process_intra_mb.h"
#include "ih264d_mvpred.h"
#include "ih264d_parse_islice.h"
#include "ih264d_inter_pred.h"
#include "ih264d_process_pslice.h"
#include "ih264d_process_bslice.h"
#include "ih264d_deblocking.h"
#include "ih264d_cabac.h"
#include "ih264d_parse_mb_header.h"
#include "ih264d_error_handler.h"
#include "ih264d_mvpred.h"
#include "ih264d_cabac.h"
#include "ih264d_utils.h"

void ih264d_init_cabac_contexts(UWORD8 u1_slice_type, dec_struct_t * ps_dec);

/*!
 **************************************************************************
 * \if Function name : ParseMb_SubMb_PredBCav\endif
 *
 * \brief
 *    Implements sub_mb_pred() of 7.3.5.2. & mb_pred() of 7.3.5.1
 *
 * \return
 *    None.
 *
 **************************************************************************
 */
WORD32 ih264d_parse_bmb_non_direct_cavlc(dec_struct_t * ps_dec,
                                       dec_mb_info_t * ps_cur_mb_info,
                                       UWORD8 u1_mb_num,
                                       UWORD8 u1_num_mbsNby2)
{
    dec_bit_stream_t * ps_bitstrm = ps_dec->ps_bitstrm;
    UWORD32 *pu4_bitstrm_buf = ps_bitstrm->pu4_buffer;
    UWORD32 *pu4_bitstrm_ofst = &ps_bitstrm->u4_ofst;
    UWORD8 * pu1_sub_mb_pred_modes = (UWORD8 *)(gau1_ih264d_submb_pred_modes) + 4;
    const UWORD8 (*pu1_mb_pred_modes)[32] =
                    (const UWORD8 (*)[32])gau1_ih264d_mb_pred_modes;
    const UWORD8 * pu1_num_mb_part = (const UWORD8 *)gau1_ih264d_num_mb_part;
    const UWORD8 * pu1_sub_mb_mc_mode = (const UWORD8 *)(gau1_ih264d_submb_mc_mode)
                    + 4;

    parse_pmbarams_t * ps_parse_mb_data = ps_dec->ps_parse_mb_data
                    + u1_num_mbsNby2;
    UWORD8 * pu1_col_info = ps_parse_mb_data->u1_col_info;
    WORD8 (*pi1_ref_idx)[MAX_REFIDX_INFO_PER_MB] = ps_parse_mb_data->i1_ref_idx;
    UWORD8 u1_mb_type = ps_cur_mb_info->u1_mb_type;
    UWORD8 u1_mb_mc_mode, u1_num_mb_part, u1_sub_mb = !(u1_mb_type ^ B_8x8);
    UWORD32 u4_mb_mc_mode = 0, u4_mb_pred_mode = 0;
    WORD32 ret;

    if(u1_sub_mb)
    {
        UWORD8 uc_i;
        u1_mb_mc_mode = 0;
        u1_num_mb_part = 4;
        /* Reading the subMB type */
        for(uc_i = 0; uc_i < 4; uc_i++)
        {

            UWORD32 ui_sub_mb_mode;

//Inlined ih264d_uev
            UWORD32 u4_bitstream_offset = *pu4_bitstrm_ofst;
            UWORD32 u4_word, u4_ldz;

            /***************************************************************/
            /* Find leading zeros in next 32 bits                          */
            /***************************************************************/
            NEXTBITS_32(u4_word, u4_bitstream_offset, pu4_bitstrm_buf);
            u4_ldz = CLZ(u4_word);
            /* Flush the ps_bitstrm */
            u4_bitstream_offset += (u4_ldz + 1);
            /* Read the suffix from the ps_bitstrm */
            u4_word = 0;
            if(u4_ldz)
                GETBITS(u4_word, u4_bitstream_offset, pu4_bitstrm_buf,
                        u4_ldz);
            *pu4_bitstrm_ofst = u4_bitstream_offset;
            ui_sub_mb_mode = ((1 << u4_ldz) + u4_word - 1);
//Inlined ih264d_uev

            if(ui_sub_mb_mode > 12)
                return ERROR_SUB_MB_TYPE;
            else
            {
                UWORD8 u1_subMbPredMode = pu1_sub_mb_pred_modes[ui_sub_mb_mode];
                u4_mb_mc_mode = (u4_mb_mc_mode << 8)
                                | pu1_sub_mb_mc_mode[ui_sub_mb_mode];
                u4_mb_pred_mode = (u4_mb_pred_mode << 8) | u1_subMbPredMode;
                pi1_ref_idx[0][uc_i] = ((u1_subMbPredMode & PRED_L0) - 1) >> 1;
                pi1_ref_idx[1][uc_i] = ((u1_subMbPredMode & PRED_L1) - 1) >> 1;
                COPYTHECONTEXT("sub_mb_type", u1_subMbPredMode);
            }
            /* Storing collocated Mb and SubMb mode information */
            *pu1_col_info++ = ((PRED_8x8) << 6)
                            | ((pu1_sub_mb_mc_mode[ui_sub_mb_mode] << 4));
            if(ui_sub_mb_mode != B_DIRECT_8x8)
            {
                if(ui_sub_mb_mode > B_BI_8x8)
                {
                    ps_dec->s_high_profile.u1_no_submb_part_size_lt8x8_flag = 0;
                }
            }
            else if(!ps_dec->s_high_profile.u1_direct_8x8_inference_flag)
            {
                ps_dec->s_high_profile.u1_no_submb_part_size_lt8x8_flag = 0;
            }
        }
    }
    else
    {
        UWORD8 u1_mb_pred_mode_idx = 5 + u1_mb_type;
        UWORD8 u1_mb_pred_mode_part0 = pu1_mb_pred_modes[0][u1_mb_pred_mode_idx];
        UWORD8 u1_mb_pred_mode_part1 = pu1_mb_pred_modes[1][u1_mb_pred_mode_idx];
        u1_mb_mc_mode = ps_cur_mb_info->u1_mb_mc_mode;
        u1_num_mb_part = pu1_num_mb_part[u1_mb_mc_mode];

        pi1_ref_idx[0][0] = ((u1_mb_pred_mode_part0 & PRED_L0) - 1) >> 1;
        pi1_ref_idx[1][0] = ((u1_mb_pred_mode_part0 & PRED_L1) - 1) >> 1;
        pi1_ref_idx[0][1] = ((u1_mb_pred_mode_part1 & PRED_L0) - 1) >> 1;
        pi1_ref_idx[1][1] = ((u1_mb_pred_mode_part1 & PRED_L1) - 1) >> 1;

        u4_mb_pred_mode = (u1_mb_pred_mode_part0 << 8) | u1_mb_pred_mode_part1;
        u4_mb_mc_mode = u1_mb_mc_mode | (u1_mb_mc_mode << 8);
        u4_mb_mc_mode <<= 16;
        u4_mb_pred_mode <<= 16;

        /* Storing collocated Mb and SubMb mode information */
        *pu1_col_info++ = (u1_mb_mc_mode << 6);
        if(u1_mb_mc_mode)
            *pu1_col_info++ = (u1_mb_mc_mode << 6);
    }

    {
        UWORD8 u1_mbaff = ps_dec->ps_cur_slice->u1_mbaff_frame_flag;
        UWORD8 uc_field = ps_cur_mb_info->u1_mb_field_decodingflag;
        UWORD8 *pu1_num_ref_idx_lx_active =
                        ps_dec->ps_cur_slice->u1_num_ref_idx_lx_active;
        const UWORD8 u1_mbaff_field = (u1_mbaff & uc_field);
        UWORD8 u4_num_ref_idx_lx_active;

        u4_num_ref_idx_lx_active = (pu1_num_ref_idx_lx_active[0]
                        << u1_mbaff_field) - 1;

        if(u4_num_ref_idx_lx_active)
        {
            if(1 == u4_num_ref_idx_lx_active)
                ih264d_parse_bmb_ref_index_cavlc_range1(
                                u1_num_mb_part, ps_bitstrm, pi1_ref_idx[0],
                                u4_num_ref_idx_lx_active);
            else
            {
                ret = ih264d_parse_bmb_ref_index_cavlc(u1_num_mb_part, ps_bitstrm,
                                                 pi1_ref_idx[0],
                                                 u4_num_ref_idx_lx_active);
                if(ret != OK)
                    return ret;
            }
        }

        u4_num_ref_idx_lx_active = (pu1_num_ref_idx_lx_active[1]
                        << u1_mbaff_field) - 1;

        if(u4_num_ref_idx_lx_active)
        {
            if(1 == u4_num_ref_idx_lx_active)
                ih264d_parse_bmb_ref_index_cavlc_range1(
                                u1_num_mb_part, ps_bitstrm, pi1_ref_idx[1],
                                u4_num_ref_idx_lx_active);
            else
            {
                ret = ih264d_parse_bmb_ref_index_cavlc(u1_num_mb_part, ps_bitstrm,
                                                 pi1_ref_idx[1],
                                                 u4_num_ref_idx_lx_active);
                if(ret != OK)
                    return ret;
            }
        }
    }

    /* Read MotionVectors */
    {
        const UWORD8 * pu1_top_left_sub_mb_indx;

        const UWORD8 * pu1_sub_mb_indx_mod =
                        (const UWORD8 *)(gau1_ih264d_submb_indx_mod)
                                        + (u1_sub_mb * 6);
        const UWORD8 * pu1_sub_mb_partw = (const UWORD8 *)gau1_ih264d_submb_partw;
        const UWORD8 * pu1_sub_mb_parth = (const UWORD8 *)gau1_ih264d_submb_parth;
        const UWORD8 * pu1_num_sub_mb_part =
                        (const UWORD8 *)gau1_ih264d_num_submb_part;
        const UWORD8 * pu1_mb_partw = (const UWORD8 *)gau1_ih264d_mb_partw;
        const UWORD8 * pu1_mb_parth = (const UWORD8 *)gau1_ih264d_mb_parth;
        UWORD8 u1_p_idx = 0, u1_num_submb_part, uc_lx;
        parse_part_params_t * ps_part;
        mv_pred_t *ps_mv_start = ps_dec->ps_mv_cur + (u1_mb_num << 4);
        UWORD8 u1_mb_part_wd, u1_mb_part_ht;

        /* Initialisations */
        ps_part = ps_dec->ps_part;
        /* Default Initialization for Non subMb Case Mode */
        u1_mb_part_wd = pu1_mb_partw[u1_mb_mc_mode];
        u1_mb_part_ht = pu1_mb_parth[u1_mb_mc_mode];
        u1_num_submb_part = 1;

        /* Decoding the MV for the subMB */
        for(uc_lx = 0; uc_lx < 2; uc_lx++)
        {
            UWORD8 u1_sub_mb_num = 0, u1_pred_mode, uc_i;
            UWORD32 u4_mb_mc_mode_tmp = u4_mb_mc_mode;
            UWORD32 u4_mb_pred_mode_tmp = u4_mb_pred_mode;
            UWORD16 u2_sub_mb_num = 0x028A; // for sub mb case
            UWORD8 u1_b2 = uc_lx << 1;
            u1_pred_mode = (uc_lx) ? PRED_L1 : PRED_L0;
            pu1_top_left_sub_mb_indx = pu1_sub_mb_indx_mod + (u1_mb_mc_mode << 1);

            for(uc_i = 0; uc_i < u1_num_mb_part; uc_i++)
            {
                UWORD8 u1_mb_mc_mode, uc_j;
                UWORD8 i1_pred = u4_mb_pred_mode_tmp >> 24;
                u1_mb_mc_mode = u4_mb_mc_mode_tmp >> 24;
                u4_mb_pred_mode_tmp <<= 8;
                u4_mb_mc_mode_tmp <<= 8;
                /* subMb prediction mode */
                if(u1_sub_mb)
                {

                    u1_mb_part_wd = pu1_sub_mb_partw[u1_mb_mc_mode];
                    u1_mb_part_ht = pu1_sub_mb_parth[u1_mb_mc_mode];
                    u1_sub_mb_num = u2_sub_mb_num >> 12;
                    u1_num_submb_part = pu1_num_sub_mb_part[u1_mb_mc_mode];
                    pu1_top_left_sub_mb_indx = pu1_sub_mb_indx_mod
                                    + (u1_mb_mc_mode << 1);
                    u2_sub_mb_num <<= 4;
                }
                for(uc_j = 0; uc_j < u1_num_submb_part;
                                uc_j++, pu1_top_left_sub_mb_indx++)
                {
                    mv_pred_t * ps_mv;
                    u1_sub_mb_num = u1_sub_mb_num + *pu1_top_left_sub_mb_indx;
                    ps_mv = ps_mv_start + u1_sub_mb_num;

                    /* Storing Info for partitions, writing only once */
                    if(uc_lx)
                    {
                        ps_part->u1_is_direct = (!i1_pred);
                        ps_part->u1_pred_mode = i1_pred;
                        ps_part->u1_sub_mb_num = u1_sub_mb_num;
                        ps_part->u1_partheight = u1_mb_part_ht;
                        ps_part->u1_partwidth = u1_mb_part_wd;
                        /* Increment partition Index */
                        u1_p_idx++;
                        ps_part++;
                    }

                    if(i1_pred & u1_pred_mode)
                    {
                        WORD16 i2_mvx, i2_mvy;

//inlining ih264d_sev
                        {
                            UWORD32 u4_bitstream_offset = *pu4_bitstrm_ofst;
                            UWORD32 u4_word, u4_ldz, u4_abs_val;

                            /***************************************************************/
                            /* Find leading zeros in next 32 bits                          */
                            /***************************************************************/
                            NEXTBITS_32(u4_word, u4_bitstream_offset,
                                        pu4_bitstrm_buf);
                            u4_ldz = CLZ(u4_word);

                            /* Flush the ps_bitstrm */
                            u4_bitstream_offset += (u4_ldz + 1);

                            /* Read the suffix from the ps_bitstrm */
                            u4_word = 0;
                            if(u4_ldz)
                                GETBITS(u4_word, u4_bitstream_offset,
                                        pu4_bitstrm_buf, u4_ldz);

                            *pu4_bitstrm_ofst = u4_bitstream_offset;
                            u4_abs_val = ((1 << u4_ldz) + u4_word) >> 1;

                            if(u4_word & 0x1)
                                i2_mvx = (-(WORD32)u4_abs_val);
                            else
                                i2_mvx = (u4_abs_val);
                        }
//inlinined ih264d_sev

//inlining ih264d_sev
                        {
                            UWORD32 u4_bitstream_offset = *pu4_bitstrm_ofst;
                            UWORD32 u4_word, u4_ldz, u4_abs_val;

                            /***************************************************************/
                            /* Find leading zeros in next 32 bits                          */
                            /***************************************************************/
                            NEXTBITS_32(u4_word, u4_bitstream_offset,
                                        pu4_bitstrm_buf);
                            u4_ldz = CLZ(u4_word);

                            /* Flush the ps_bitstrm */
                            u4_bitstream_offset += (u4_ldz + 1);

                            /* Read the suffix from the ps_bitstrm */
                            u4_word = 0;
                            if(u4_ldz)
                                GETBITS(u4_word, u4_bitstream_offset,
                                        pu4_bitstrm_buf, u4_ldz);

                            *pu4_bitstrm_ofst = u4_bitstream_offset;
                            u4_abs_val = ((1 << u4_ldz) + u4_word) >> 1;

                            if(u4_word & 0x1)
                                i2_mvy = (-(WORD32)u4_abs_val);
                            else
                                i2_mvy = (u4_abs_val);
                        }
//inlinined ih264d_sev

                        /* Storing Mv residuals */
                        ps_mv->i2_mv[u1_b2] = i2_mvx;
                        ps_mv->i2_mv[u1_b2 + 1] = i2_mvy;
                    }
                }
            }
        }
        /* write back to the scratch partition info */
        ps_dec->ps_part = ps_part;
        ps_parse_mb_data->u1_num_part = u1_sub_mb ? u1_p_idx : u1_num_mb_part;

    }
    return OK;
}

/*!
 **************************************************************************
 * \if Function name : ParseMb_SubMb_PredBCab\endif
 *
 * \brief
 *    Implements sub_mb_pred() of 7.3.5.2. & mb_pred() of 7.3.5.1
 *
 * \return
 *    None.
 *
 **************************************************************************
 */

WORD32 ih264d_parse_bmb_non_direct_cabac(dec_struct_t * ps_dec,
                                       dec_mb_info_t * ps_cur_mb_info,
                                       UWORD8 u1_mb_num,
                                       UWORD8 u1_num_mbsNby2)
{
    /* Loads from 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 *p_curr_ctxt = ps_dec->ps_curr_ctxt_mb_info;
    parse_pmbarams_t * ps_parse_mb_data = ps_dec->ps_parse_mb_data
                    + u1_num_mbsNby2;

    /* table pointer loads */
    const UWORD8 * pu1_sub_mb_pred_modes = (UWORD8 *)(gau1_ih264d_submb_pred_modes)
                    + 4;
    const UWORD8 (*pu1_mb_pred_modes)[32] =
                    (const UWORD8 (*)[32])gau1_ih264d_mb_pred_modes;
    const UWORD8 *pu1_num_mb_part = (const UWORD8 *)gau1_ih264d_num_mb_part;
    const UWORD8 *pu1_sub_mb_mc_mode = (UWORD8 *)(gau1_ih264d_submb_mc_mode) + 4;

    const UWORD8 u1_mb_type = ps_cur_mb_info->u1_mb_type;
    UWORD8 * pu1_col_info = ps_parse_mb_data->u1_col_info;
    WORD8 *pi1_ref_idx_l0 = &ps_parse_mb_data->i1_ref_idx[0][0];
    WORD8 *pi1_ref_idx_l1 = &ps_parse_mb_data->i1_ref_idx[1][0];
    UWORD8 u1_dec_ref_l0, u1_dec_ref_l1;

    UWORD8 u1_num_mb_part, u1_mb_mc_mode, u1_sub_mb, u1_mbpred_mode = 5
                    + u1_mb_type;
    UWORD32 u4_mb_mc_mode = 0, u4_mb_pred_mode = 0;
    WORD32 ret;

    p_curr_ctxt->u1_mb_type = CAB_NON_BD16x16;
    u1_sub_mb = !(u1_mb_type ^ B_8x8);

    {
        UWORD8 u1_mbaff = ps_dec->ps_cur_slice->u1_mbaff_frame_flag;
        UWORD8 *pu1_num_ref_idx_lx_active =
                        ps_dec->ps_cur_slice->u1_num_ref_idx_lx_active;
        UWORD8 uc_field = ps_cur_mb_info->u1_mb_field_decodingflag;
        UWORD8 u1_mbaff_field = (u1_mbaff & uc_field);
        u1_dec_ref_l0 = (pu1_num_ref_idx_lx_active[0] << u1_mbaff_field) - 1;
        u1_dec_ref_l1 = (pu1_num_ref_idx_lx_active[1] << u1_mbaff_field) - 1;
    }

    if(u1_sub_mb)
    {
        const UWORD8 u1_colz = ((PRED_8x8) << 6);
        UWORD8 uc_i;
        u1_mb_mc_mode = 0;
        u1_num_mb_part = 4;
        /* Reading the subMB type */
        for(uc_i = 0; uc_i < 4; uc_i++)
        {
            UWORD8 u1_sub_mb_mode, u1_subMbPredModes;
            u1_sub_mb_mode = ih264d_parse_submb_type_cabac(
                            1, ps_cab_env, ps_bitstrm,
                            ps_dec->p_sub_mb_type_t);

            if(u1_sub_mb_mode > 12)
                return ERROR_SUB_MB_TYPE;

            u1_subMbPredModes = pu1_sub_mb_pred_modes[u1_sub_mb_mode];
            u4_mb_mc_mode = (u4_mb_mc_mode << 8) | pu1_sub_mb_mc_mode[u1_sub_mb_mode];
            u4_mb_pred_mode = (u4_mb_pred_mode << 8) | u1_subMbPredModes;
            *pi1_ref_idx_l0++ =
                            (u1_subMbPredModes & PRED_L0) ? u1_dec_ref_l0 : -1;
            *pi1_ref_idx_l1++ =
                            (u1_subMbPredModes & PRED_L1) ? u1_dec_ref_l1 : -1;
            COPYTHECONTEXT("sub_mb_type", u1_sub_mb_mode);
            /* Storing collocated Mb and SubMb mode information */
            *pu1_col_info++ =
                            (u1_colz | (pu1_sub_mb_mc_mode[u1_sub_mb_mode] << 4));
            if(u1_sub_mb_mode != B_DIRECT_8x8)
            {
                if(u1_sub_mb_mode > B_BI_8x8)
                {
                    ps_dec->s_high_profile.u1_no_submb_part_size_lt8x8_flag = 0;
                }
            }
            else if(!ps_dec->s_high_profile.u1_direct_8x8_inference_flag)
            {
                ps_dec->s_high_profile.u1_no_submb_part_size_lt8x8_flag = 0;
            }
        }
        pi1_ref_idx_l0 -= 4;
        pi1_ref_idx_l1 -= 4;
    }
    else
    {
        UWORD8 u1_mb_pred_mode_part0 = pu1_mb_pred_modes[0][u1_mbpred_mode];
        UWORD8 u1_mb_pred_mode_part1 = pu1_mb_pred_modes[1][u1_mbpred_mode];
        u1_mb_mc_mode = ps_cur_mb_info->u1_mb_mc_mode;
        u1_num_mb_part = pu1_num_mb_part[u1_mb_mc_mode];
        /* Storing collocated Mb and SubMb mode information */
        *pu1_col_info++ = (u1_mb_mc_mode << 6);
        if(u1_mb_mc_mode)
            *pu1_col_info++ = (u1_mb_mc_mode << 6);
        u4_mb_mc_mode = u1_mb_mc_mode | (u1_mb_mc_mode << 8);
        u4_mb_mc_mode <<= 16;
        u4_mb_pred_mode = ((u1_mb_pred_mode_part0 << 8) | u1_mb_pred_mode_part1) << 16;

        *pi1_ref_idx_l0++ = (u1_mb_pred_mode_part0 & PRED_L0) ? u1_dec_ref_l0 : -1;
        *pi1_ref_idx_l0-- = (u1_mb_pred_mode_part1 & PRED_L0) ? u1_dec_ref_l0 : -1;
        *pi1_ref_idx_l1++ = (u1_mb_pred_mode_part0 & PRED_L1) ? u1_dec_ref_l1 : -1;
        *pi1_ref_idx_l1-- = (u1_mb_pred_mode_part1 & PRED_L1) ? u1_dec_ref_l1 : -1;
    }
    {
        WORD8 *pi1_lft_cxt = ps_dec->pi1_left_ref_idx_ctxt_inc;
        WORD8 *pi1_top_cxt = p_curr_ctxt->i1_ref_idx;

        ret = ih264d_parse_ref_idx_cabac(u1_num_mb_part, 0, u1_dec_ref_l0,
                                   u1_mb_mc_mode, pi1_ref_idx_l0, pi1_lft_cxt,
                                   pi1_top_cxt, ps_cab_env, ps_bitstrm,
                                   ps_dec->p_ref_idx_t);
        if(ret != OK)
            return ret;

        ret = ih264d_parse_ref_idx_cabac(u1_num_mb_part, 2, u1_dec_ref_l1,
                                   u1_mb_mc_mode, pi1_ref_idx_l1, pi1_lft_cxt,
                                   pi1_top_cxt, ps_cab_env, ps_bitstrm,
                                   ps_dec->p_ref_idx_t);
        if(ret != OK)
            return ret;
    }
    /* Read MotionVectors */
    {
        const UWORD8 *pu1_top_left_sub_mb_indx;
        UWORD8 uc_j, uc_lx;
        UWORD8 u1_mb_part_wd, u1_mb_part_ht;

        const UWORD8 *pu1_sub_mb_indx_mod =
                        (const UWORD8 *)gau1_ih264d_submb_indx_mod
                                        + (u1_sub_mb * 6);
        const UWORD8 *pu1_sub_mb_partw = (const UWORD8 *)gau1_ih264d_submb_partw;
        const UWORD8 *pu1_sub_mb_parth = (const UWORD8 *)gau1_ih264d_submb_parth;
        const UWORD8 *pu1_num_sub_mb_part =
                        (const UWORD8 *)gau1_ih264d_num_submb_part;
        const UWORD8 *pu1_mb_partw = (const UWORD8 *)gau1_ih264d_mb_partw;
        const UWORD8 *pu1_mb_parth = (const UWORD8 *)gau1_ih264d_mb_parth;

        UWORD8 u1_p_idx = 0;
        UWORD8 u1_num_submb_part;
        parse_part_params_t *ps_part;
        /* Initialisations */
        mv_pred_t *ps_mv_start = ps_dec->ps_mv_cur + (u1_mb_num << 4);
        ps_part = ps_dec->ps_part;

        /* Default initialization for non subMb case */
        u1_mb_part_wd = pu1_mb_partw[u1_mb_mc_mode];
        u1_mb_part_ht = pu1_mb_parth[u1_mb_mc_mode];
        u1_num_submb_part = 1;

        /* Decoding the MV for the subMB */
        for(uc_lx = 0; uc_lx < 2; uc_lx++)
        {
            UWORD8 u1_sub_mb_num = 0;
            UWORD32 u4_mb_pred_mode_tmp = u4_mb_pred_mode;
            UWORD32 u4_mb_mc_mode_tmp = u4_mb_mc_mode;
            UWORD8 u1_mb_mc_mode_1, u1_pred_mode, uc_i;
            UWORD16 u2_sub_mb_num = 0x028A;
            UWORD8 u1_b2 = uc_lx << 1;
            u1_pred_mode = (uc_lx) ? PRED_L1 : PRED_L0;
            /* Default for Cabac */
            pu1_top_left_sub_mb_indx = pu1_sub_mb_indx_mod + (u1_mb_mc_mode << 1);
            for(uc_i = 0; uc_i < u1_num_mb_part; uc_i++)
            {

                WORD8 i1_pred = (UWORD8)(u4_mb_pred_mode_tmp >> 24);
                u1_mb_mc_mode_1 = (UWORD8)(u4_mb_mc_mode_tmp >> 24);
                u4_mb_pred_mode_tmp <<= 8;
                u4_mb_mc_mode_tmp <<= 8;

                /* subMb prediction mode */
                if(u1_sub_mb)
                {
                    u1_mb_part_wd = pu1_sub_mb_partw[u1_mb_mc_mode_1];
                    u1_mb_part_ht = pu1_sub_mb_parth[u1_mb_mc_mode_1];
                    u1_sub_mb_num = u2_sub_mb_num >> 12;
                    pu1_top_left_sub_mb_indx = pu1_sub_mb_indx_mod + (u1_mb_mc_mode_1 << 1);
                    u1_num_submb_part = pu1_num_sub_mb_part[u1_mb_mc_mode_1];
                    u2_sub_mb_num = u2_sub_mb_num << 4;
                }

                for(uc_j = 0; uc_j < u1_num_submb_part;
                                uc_j++, pu1_top_left_sub_mb_indx++)
                {
                    mv_pred_t *ps_mv;
                    u1_sub_mb_num = u1_sub_mb_num + *pu1_top_left_sub_mb_indx;
                    ps_mv = ps_mv_start + u1_sub_mb_num;

                    /* Storing Info for partitions, writing only once */
                    if(uc_lx)
                    {
                        ps_part->u1_is_direct = (!i1_pred);
                        ps_part->u1_pred_mode = i1_pred;
                        ps_part->u1_sub_mb_num = u1_sub_mb_num;
                        ps_part->u1_partheight = u1_mb_part_ht;
                        ps_part->u1_partwidth = u1_mb_part_wd;

                        /* Increment partition Index */
                        u1_p_idx++;
                        ps_part++;
                    }

                    ih264d_get_mvd_cabac(u1_sub_mb_num, u1_b2, u1_mb_part_wd,
                                         u1_mb_part_ht,
                                         (UWORD8)(i1_pred & u1_pred_mode), ps_dec,
                                         ps_mv);
                }
            }
        }
        /* write back to the scratch partition info */

        ps_dec->ps_part = ps_part;
        ps_parse_mb_data->u1_num_part = u1_sub_mb ? u1_p_idx : u1_num_mb_part;

    }

    return OK;
}

/*!
 **************************************************************************
 * \if Function name : ih264d_parse_bmb_cabac \endif
 *
 * \brief
 *    This function parses CABAC syntax of a B MB.
 *
 * \return
 *    0 on Success and Error code otherwise
 **************************************************************************
 */
WORD32 ih264d_parse_bmb_cabac(dec_struct_t * ps_dec,
                              dec_mb_info_t * ps_cur_mb_info,
                              UWORD8 u1_mb_num,
                              UWORD8 u1_num_mbsNby2)
{
    UWORD8 u1_cbp;
    deblk_mb_t * ps_cur_deblk_mb = ps_dec->ps_deblk_mbn + u1_mb_num;
    const UWORD8 *puc_mb_mc_mode = (const UWORD8 *)gau1_ih264d_mb_mc_mode;
    UWORD8 u1_mb_type = ps_cur_mb_info->u1_mb_type;
    ctxt_inc_mb_info_t *p_curr_ctxt = ps_dec->ps_curr_ctxt_mb_info;

    WORD32 ret;
    UWORD8 u1_Bdirect_tranform_read = 1;
    ps_dec->s_high_profile.u1_no_submb_part_size_lt8x8_flag = 1;

    ps_cur_mb_info->u1_mb_mc_mode = puc_mb_mc_mode[5 + u1_mb_type];

    ps_cur_mb_info->u1_yuv_dc_block_flag = 0;

    ps_cur_deblk_mb->u1_mb_type |= D_B_SLICE;
    if(u1_mb_type != B_DIRECT)
    {
        ret = ih264d_parse_bmb_non_direct_cabac(ps_dec, ps_cur_mb_info, u1_mb_num,
                                          u1_num_mbsNby2);
        if(ret != OK)
            return ret;
    }
    else
    {

        /************ STORING PARTITION INFO ***********/
        parse_part_params_t * ps_part_info;
        ps_part_info = ps_dec->ps_part;
        ps_part_info->u1_is_direct = PART_DIRECT_16x16;
        ps_part_info->u1_sub_mb_num = 0;
        ps_dec->ps_part++;
        p_curr_ctxt->u1_mb_type = CAB_BD16x16;

        MEMSET_16BYTES(&ps_dec->pu1_left_mv_ctxt_inc[0][0], 0);
        memset(ps_dec->pi1_left_ref_idx_ctxt_inc, 0, 4);
        MEMSET_16BYTES(p_curr_ctxt->u1_mv, 0);
        memset(p_curr_ctxt->i1_ref_idx, 0, 4);

        /* check whether transform8x8 u4_flag to be read or not */
        u1_Bdirect_tranform_read =
                        ps_dec->s_high_profile.u1_direct_8x8_inference_flag;
    }

    /* Read the Coded block pattern */
    u1_cbp = (WORD8)ih264d_parse_ctx_cbp_cabac(ps_dec);
    p_curr_ctxt->u1_cbp = u1_cbp;
    ps_cur_mb_info->u1_cbp = u1_cbp;

    if(u1_cbp > 47)
        return ERROR_CBP;

    COPYTHECONTEXT("coded_block_pattern", u1_cbp);

    ps_cur_mb_info->u1_tran_form8x8 = 0;
    ps_cur_mb_info->ps_curmb->u1_tran_form8x8 = 0;

    if((ps_dec->s_high_profile.u1_transform8x8_present) && (u1_cbp & (0xf))
                    && (ps_dec->s_high_profile.u1_no_submb_part_size_lt8x8_flag)
                    && (u1_Bdirect_tranform_read))
    {
        ps_cur_mb_info->u1_tran_form8x8 = ih264d_parse_transform8x8flag_cabac(
                        ps_dec, ps_cur_mb_info);
        COPYTHECONTEXT("transform_size_8x8_flag", ps_cur_mb_info->u1_tran_form8x8);

        ps_cur_mb_info->ps_curmb->u1_tran_form8x8 = ps_cur_mb_info->u1_tran_form8x8;
        p_curr_ctxt->u1_transform8x8_ctxt = ps_cur_mb_info->u1_tran_form8x8;
    }
    else
    {
        p_curr_ctxt->u1_transform8x8_ctxt = 0;
    }

    p_curr_ctxt->u1_intra_chroma_pred_mode = 0;
    p_curr_ctxt->u1_yuv_dc_csbp &= 0xFE;
    ps_dec->pu1_left_yuv_dc_csbp[0] &= 0x6;

    /* Read mb_qp_delta */
    if(u1_cbp)
    {
        WORD8 c_temp;
        ret = ih264d_parse_mb_qp_delta_cabac(ps_dec, &c_temp);
        if(ret != OK)
            return ret;
        COPYTHECONTEXT("mb_qp_delta", c_temp);
        if(c_temp)
        {
            ret = ih264d_update_qp(ps_dec, c_temp);
            if(ret != OK)
                return ret;
        }
    }
    else
        ps_dec->i1_prev_mb_qp_delta = 0;

    ih264d_parse_residual4x4_cabac(ps_dec, ps_cur_mb_info, 0);
    if(EXCEED_OFFSET(ps_dec->ps_bitstrm))
        return ERROR_EOB_TERMINATE_T;
    return OK;
}
/*!
 **************************************************************************
 * \if Function name : ih264d_parse_bmb_cavlc \endif
 *
 * \brief
 *    This function parses CAVLC syntax of a B MB.
 *
 * \return
 *    0 on Success and Error code otherwise
 **************************************************************************
 */
WORD32 ih264d_parse_bmb_cavlc(dec_struct_t * ps_dec,
                              dec_mb_info_t * ps_cur_mb_info,
                              UWORD8 u1_mb_num,
                              UWORD8 u1_num_mbsNby2)
{
    UWORD32 u4_cbp;
    deblk_mb_t * ps_cur_deblk_mb = ps_dec->ps_deblk_mbn + u1_mb_num;
    dec_bit_stream_t * const ps_bitstrm = ps_dec->ps_bitstrm;
    UWORD32 * pu4_bitstrm_buf = ps_bitstrm->pu4_buffer;
    UWORD32 *pu4_bitstrm_ofst = &ps_bitstrm->u4_ofst;
    const UWORD8 *puc_mb_mc_mode = (const UWORD8 *)gau1_ih264d_mb_mc_mode;
    UWORD8 u1_mb_type = ps_cur_mb_info->u1_mb_type;

    WORD32 ret;
    UWORD8 u1_Bdirect_tranform_read = 1;
    ps_dec->s_high_profile.u1_no_submb_part_size_lt8x8_flag = 1;
    ps_cur_mb_info->u1_tran_form8x8 = 0;
    ps_cur_mb_info->ps_curmb->u1_tran_form8x8 = 0;

    ps_cur_mb_info->u1_yuv_dc_block_flag = 0;

    ps_cur_mb_info->u1_mb_mc_mode = puc_mb_mc_mode[5 + u1_mb_type];

    ps_cur_deblk_mb->u1_mb_type |= D_B_SLICE;
    if(u1_mb_type != B_DIRECT)
    {
        ret = ih264d_parse_bmb_non_direct_cavlc(ps_dec, ps_cur_mb_info, u1_mb_num,
                                          u1_num_mbsNby2);
        if(ret != OK)
            return ret;
    }
    else
    {
        /************ STORING PARTITION INFO ***********/
        parse_part_params_t * ps_part_info;
        ps_part_info = ps_dec->ps_part;
        ps_part_info->u1_is_direct = PART_DIRECT_16x16;
        ps_part_info->u1_sub_mb_num = 0;
        ps_dec->ps_part++;
        /* check whether transform8x8 u4_flag to be read or not */
        u1_Bdirect_tranform_read =
                        ps_dec->s_high_profile.u1_direct_8x8_inference_flag;
    }

    /* Read the Coded block pattern */
    {
        const UWORD8 * puc_CbpInter = gau1_ih264d_cbp_inter;
//Inlined ih264d_uev
        UWORD32 u4_bitstream_offset = *pu4_bitstrm_ofst;
        UWORD32 u4_word, u4_ldz;

        /***************************************************************/
        /* Find leading zeros in next 32 bits                          */
        /***************************************************************/
        NEXTBITS_32(u4_word, u4_bitstream_offset, pu4_bitstrm_buf);
        u4_ldz = CLZ(u4_word);
        /* Flush the ps_bitstrm */
        u4_bitstream_offset += (u4_ldz + 1);
        /* Read the suffix from the ps_bitstrm */
        u4_word = 0;
        if(u4_ldz)
            GETBITS(u4_word, u4_bitstream_offset, pu4_bitstrm_buf, u4_ldz);
        *pu4_bitstrm_ofst = u4_bitstream_offset;
        u4_cbp = ((1 << u4_ldz) + u4_word - 1);
//Inlined ih264d_uev
        if(u4_cbp > 47)
            return ERROR_CBP;
        u4_cbp = puc_CbpInter[u4_cbp];

        if((ps_dec->s_high_profile.u1_transform8x8_present) && (u4_cbp & (0xf))
                        && (ps_dec->s_high_profile.u1_no_submb_part_size_lt8x8_flag)
                        && (u1_Bdirect_tranform_read))
        {
            ps_cur_mb_info->u1_tran_form8x8 = ih264d_get_bit_h264(ps_bitstrm);
            COPYTHECONTEXT("transform_size_8x8_flag", ps_cur_mb_info->u1_tran_form8x8);
            ps_cur_mb_info->ps_curmb->u1_tran_form8x8 = ps_cur_mb_info->u1_tran_form8x8;
        }

    }

    COPYTHECONTEXT("coded_block_pattern", u4_cbp);
    ps_cur_mb_info->u1_cbp = u4_cbp;

    /* Read mb_qp_delta */
    if(u4_cbp)
    {
        WORD32 i_temp;
//inlining ih264d_sev

        UWORD32 u4_bitstream_offset = *pu4_bitstrm_ofst;
        UWORD32 u4_word, u4_ldz, u4_abs_val;

        /***************************************************************/
        /* Find leading zeros in next 32 bits                          */
        /***************************************************************/
        NEXTBITS_32(u4_word, u4_bitstream_offset, pu4_bitstrm_buf);
        u4_ldz = CLZ(u4_word);

        /* Flush the ps_bitstrm */
        u4_bitstream_offset += (u4_ldz + 1);

        /* Read the suffix from the ps_bitstrm */
        u4_word = 0;
        if(u4_ldz)
            GETBITS(u4_word, u4_bitstream_offset, pu4_bitstrm_buf, u4_ldz);

        *pu4_bitstrm_ofst = u4_bitstream_offset;
        u4_abs_val = ((1 << u4_ldz) + u4_word) >> 1;

        if(u4_word & 0x1)
            i_temp = (-(WORD32)u4_abs_val);
        else
            i_temp = (u4_abs_val);

        if(i_temp < -26 || i_temp > 25)
            return ERROR_INV_RANGE_QP_T;
//inlinined ih264d_sev
        COPYTHECONTEXT("mb_qp_delta", i_temp);
        if(i_temp)
        {
            ret = ih264d_update_qp(ps_dec, (WORD8)i_temp);
            if(ret != OK)
                return ret;
        }

        ret = ih264d_parse_residual4x4_cavlc(ps_dec, ps_cur_mb_info, 0);
        if(ret != OK)
            return ret;
        if(EXCEED_OFFSET(ps_bitstrm))
            return ERROR_EOB_TERMINATE_T;
    }
    else
    {
        ps_dec->i1_prev_mb_qp_delta = 0;
        ih264d_update_nnz_for_skipmb(ps_dec, ps_cur_mb_info, CAVLC);
    }

    return OK;
}

WORD32 ih264d_mv_pred_ref_tfr_nby2_bmb(dec_struct_t * ps_dec,
                                     UWORD8 u1_mb_idx,
                                     UWORD8 u1_num_mbs)
{
    parse_pmbarams_t * ps_mb_part_info;
    parse_part_params_t * ps_part;
    mv_pred_t *ps_mv_nmb, *ps_mv_nmb_start, *ps_mv_ntop, *ps_mv_ntop_start;
    pic_buffer_t * ps_ref_frame;
    UWORD8 u1_direct_mode_width;
    UWORD8 i, j;
    dec_mb_info_t * ps_cur_mb_info;
    const UWORD8 u1_mbaff = ps_dec->ps_cur_slice->u1_mbaff_frame_flag;
    UWORD8 u1_field;
    WORD32 ret = 0;

    ps_dec->i4_submb_ofst -= (u1_num_mbs - u1_mb_idx) << 4;
    ps_mb_part_info = ps_dec->ps_parse_mb_data;
    ps_part = ps_dec->ps_parse_part_params;

    /* N/2 Mb MvPred and Transfer Setup Loop */
    for(i = u1_mb_idx; i < u1_num_mbs; i++, ps_mb_part_info++)
    {
        UWORD8 u1_colz = 0;
        ps_dec->i4_submb_ofst += SUB_BLK_SIZE;
        /* Restore the slice scratch MbX and MbY context */
        ps_cur_mb_info = ps_dec->ps_nmb_info + i;


        u1_field = ps_cur_mb_info->u1_mb_field_decodingflag;

        ps_mv_nmb_start = ps_dec->ps_mv_cur + (i << 4);
        ps_dec->u2_mbx = ps_cur_mb_info->u2_mbx;
        ps_dec->u2_mby = ps_cur_mb_info->u2_mby;
        ps_dec->u1_currB_type = 0;
        ps_dec->u2_mv_2mb[i & 0x1] = 0;

        /* Look for MV Prediction and Reference Transfer in Non-I Mbs */
        if(!ps_mb_part_info->u1_isI_mb)
        {
            UWORD8 u1_blk_no;
            WORD16 i1_ref_idx, i1_ref_idx1;
            UWORD8 u1_pred_mode;
            UWORD8 u1_sub_mb_x, u1_sub_mb_y, u1_sub_mb_num;
            UWORD8 u1_lx, u1_lx_start, u1_lxend, u1_tmp_lx;
            UWORD8 u1_num_part, u1_num_ref, u1_wd, u1_ht;
            UWORD32 *pu4_wt_offst;
            UWORD8 u1_scale_ref, u4_bot_mb;
            deblk_mb_t * ps_cur_deblk_mb = ps_dec->ps_deblk_mbn + i;
            WORD8 (*pi1_ref_idx)[MAX_REFIDX_INFO_PER_MB] =
                            ps_mb_part_info->i1_ref_idx;
            WORD8 *pi1_ref_idx0 = pi1_ref_idx[0],
                            *pi1_ref_idx1 = pi1_ref_idx[1];
            UWORD32 **ppu4_wt_ofst = ps_mb_part_info->pu4_wt_offst;

            /* MB Level initialisations */
            ps_dec->u4_num_pmbair = i >> u1_mbaff;
            ps_dec->u1_mb_idx_mv = i;

            /* CHANGED CODE */
            ps_mv_ntop_start = ps_mv_nmb_start
                            - (ps_dec->u2_frm_wd_in_mbs << (4 + u1_mbaff)) + 12;

            u1_num_part = ps_mb_part_info->u1_num_part;
            ps_cur_deblk_mb->u1_mb_type |= (u1_num_part > 1) << 1;
            u1_direct_mode_width = (1 == ps_mb_part_info->u1_num_part) ? 16 : 8;


            ps_cur_mb_info->u4_pred_info_pkd_idx = ps_dec->u4_pred_info_pkd_idx;
            ps_cur_mb_info->u1_num_pred_parts = 0;

            /****************************************************/
            /* weighted u4_ofst pointer calculations, this loop  */
            /* runs maximum 4 times, even in direct cases       */
            /****************************************************/
            u1_scale_ref = u1_mbaff & ps_cur_mb_info->u1_mb_field_decodingflag;
            u4_bot_mb = 1 - ps_cur_mb_info->u1_topmb;
            if(ps_dec->ps_cur_pps->u1_wted_bipred_idc)
            {
                u1_num_ref = MIN(u1_num_part, 4);
                if(PART_DIRECT_16x16 != ps_part->u1_is_direct)
                {
                    for(u1_blk_no = 0; u1_blk_no < u1_num_ref; u1_blk_no++)
                    {
                        i1_ref_idx = MAX(pi1_ref_idx0[u1_blk_no], 0);
                        if(u1_scale_ref)
                            i1_ref_idx >>= 1;
                        i1_ref_idx *=
                                        ps_dec->ps_cur_slice->u1_num_ref_idx_lx_active[1];
                        if(u1_scale_ref)
                            i1_ref_idx +=
                                            (MAX(pi1_ref_idx1[u1_blk_no], 0)
                                                            >> 1);
                        else
                            i1_ref_idx += MAX(pi1_ref_idx1[u1_blk_no], 0);
                        pu4_wt_offst = (UWORD32*)&ps_dec->pu4_wt_ofsts[2
                                        * X3(i1_ref_idx)];

                        if(pi1_ref_idx0[u1_blk_no] < 0)
                            pu4_wt_offst += 1;

                        ppu4_wt_ofst[u1_blk_no] = pu4_wt_offst;
                        if(u1_scale_ref
                                        && (ps_dec->ps_cur_pps->u1_wted_bipred_idc
                                                        == 2))
                        {
                            i1_ref_idx = MAX(pi1_ref_idx0[u1_blk_no], 0);
                            i1_ref_idx *=
                                            (ps_dec->ps_cur_slice->u1_num_ref_idx_lx_active[1]
                                                            << 1);
                            i1_ref_idx += MAX(pi1_ref_idx1[u1_blk_no], 0);
                            if(u4_bot_mb)
                            {
                                i1_ref_idx +=
                                                (ps_dec->ps_cur_slice->u1_num_ref_idx_lx_active[0]
                                                                << 1)
                                                                * (ps_dec->ps_cur_slice->u1_num_ref_idx_lx_active[1]
                                                                                << 1);
                            }
                            pu4_wt_offst = (UWORD32*)&ps_dec->pu4_mbaff_wt_mat[2
                                            * X3(i1_ref_idx)];
                            ppu4_wt_ofst[u1_blk_no] = pu4_wt_offst;
                        }
                    }
                }
            }

            /**************************************************/
            /* Loop on Partitions                             */
            /* direct mode is reflected as a single partition */
            /**************************************************/
            for(j = 0; j < u1_num_part; j++, ps_part++)
            {
                u1_sub_mb_num = ps_part->u1_sub_mb_num;
                ps_dec->u1_sub_mb_num = u1_sub_mb_num;

                if(PART_NOT_DIRECT != ps_part->u1_is_direct)
                {
                    /**************************************************/
                    /* Direct Mode, Call DecodeSpatial/TemporalDirect */
                    /* only (those will in turn call FormMbPartInfo)  */
                    /**************************************************/
                    ret = ps_dec->ps_cur_slice->pf_decodeDirect(ps_dec,
                                                                u1_direct_mode_width,
                                                                ps_cur_mb_info, i);
                    if(ret != OK)
                        return ret;
                    ps_cur_deblk_mb->u1_mb_type |= (ps_dec->u1_currB_type << 1);

                }
                else
                {
                    mv_pred_t s_mvPred;
                    /**************************************************/
                    /* Non Direct Mode, Call Motion Vector Predictor  */
                    /* and FormMbpartInfo                             */
                    /**************************************************/
                    u1_sub_mb_x = u1_sub_mb_num & 0x03;
                    u1_sub_mb_y = u1_sub_mb_num >> 2;
                    u1_blk_no =
                                    (u1_num_part < 4) ?
                                                    j :
                                                    (((u1_sub_mb_y >> 1) << 1)
                                                                    + (u1_sub_mb_x
                                                                                    >> 1));

                    ps_mv_ntop = ps_mv_ntop_start + u1_sub_mb_x;
                    ps_mv_nmb = ps_mv_nmb_start + u1_sub_mb_num;

                    u1_pred_mode = ps_part->u1_pred_mode;
                    u1_wd = ps_part->u1_partwidth;
                    u1_ht = ps_part->u1_partheight;

                    u1_lx_start = 0;
                    u1_lxend = 2;
                    if( PRED_L0 == u1_pred_mode)
                    {
                        s_mvPred.i2_mv[2] = 0;
                        s_mvPred.i2_mv[3] = 0;
                        u1_lxend = 1;
                    }
                    if( PRED_L1 == u1_pred_mode)
                    {
                        s_mvPred.i2_mv[0] = 0;
                        s_mvPred.i2_mv[1] = 0;
                        u1_lx_start = 1;
                    }

                    /* Populate the colpic info and reference frames */
                    s_mvPred.i1_ref_frame[0] = pi1_ref_idx0[u1_blk_no];
                    s_mvPred.i1_ref_frame[1] = pi1_ref_idx1[u1_blk_no];

                    ps_dec->pf_mvpred(ps_dec, ps_cur_mb_info, ps_mv_nmb, ps_mv_ntop,
                                      &s_mvPred, u1_sub_mb_num, u1_wd,
                                      u1_lx_start, u1_lxend,
                                      ps_cur_mb_info->u1_mb_mc_mode);

                    /**********************************************************/
                    /* Loop on number of predictors, 1 Each for Forw Backw    */
                    /* Loop 2 times for BiDirect mode                         */
                    /**********************************************************/
                    for(u1_lx = u1_lx_start; u1_lx < u1_lxend; u1_lx++)
                    {
                        WORD16 i2_mv_x, i2_mv_y;

                        /********************************************************/
                        /* Predict Mv                                           */
                        /* Add Mv Residuals and store back                      */
                        /********************************************************/
                        i1_ref_idx = s_mvPred.i1_ref_frame[u1_lx];
                        u1_tmp_lx = (u1_lx << 1);

                        i2_mv_x = ps_mv_nmb->i2_mv[u1_tmp_lx];
                        i2_mv_y = ps_mv_nmb->i2_mv[u1_tmp_lx + 1];

                        i2_mv_x += s_mvPred.i2_mv[u1_tmp_lx];
                        i2_mv_y += s_mvPred.i2_mv[u1_tmp_lx + 1];
                        s_mvPred.i2_mv[u1_tmp_lx] = i2_mv_x;
                        s_mvPred.i2_mv[u1_tmp_lx + 1] = i2_mv_y;

                        /********************************************************/
                        /* Transfer setup call                                  */
                        /* convert RefIdx if it is MbAff                        */
                        /* Pass Weight Offset and refFrame                      */
                        /********************************************************/
                        i1_ref_idx1 = i1_ref_idx >> u1_scale_ref;
                        if(u1_scale_ref && ((i1_ref_idx & 0x01) != u4_bot_mb))
                            i1_ref_idx1 += MAX_REF_BUFS;
                        ps_ref_frame =
                                        ps_dec->ps_ref_pic_buf_lx[u1_lx][i1_ref_idx1];

                        /* Storing Colocated-Zero u4_flag */
                        if(u1_lx == u1_lx_start)
                        {
                            /* Fill colocated info in MvPred structure */
                            s_mvPred.u1_col_ref_pic_idx =
                                            ps_ref_frame->u1_mv_buf_id;
                            s_mvPred.u1_pic_type = ps_ref_frame->u1_pic_type;

                            /* Calculating colocated zero information */
                            u1_colz =
                                            (u1_field << 1)
                                                            | ((i1_ref_idx == 0)
                                                                            && (ABS(i2_mv_x)
                                                                                            <= 1)
                                                                            && (ABS(i2_mv_y)
                                                                                            <= 1));
                            u1_colz |= ps_mb_part_info->u1_col_info[u1_blk_no];
                        }

                        pu4_wt_offst = ppu4_wt_ofst[u1_blk_no];
                        {
                            pred_info_pkd_t *ps_pred_pkd;
                           WORD16 i2_mv[2];

                           i2_mv[0] = i2_mv_x;
                           i2_mv[1] = i2_mv_y;

                           ps_pred_pkd = ps_dec->ps_pred_pkd + ps_dec->u4_pred_info_pkd_idx;
                        ih264d_fill_pred_info(i2_mv,u1_wd,u1_ht,u1_sub_mb_num,u1_pred_mode,
                                        ps_pred_pkd,ps_ref_frame->u1_pic_buf_id,i1_ref_idx,pu4_wt_offst,
                                        ps_ref_frame->u1_pic_type);
                        ps_dec->u4_pred_info_pkd_idx++;
                        ps_cur_mb_info->u1_num_pred_parts++;


                        }

                    }
                    ih264d_rep_mv_colz(ps_dec, &s_mvPred, ps_mv_nmb,
                                       u1_sub_mb_num, u1_colz, u1_ht,
                                       u1_wd);
                }
            }

        }
        else
        {
            /* Set zero values in case of Intra Mbs */
            mv_pred_t s_mvPred =
                {
                    { 0, 0, 0, 0 },
                      { -1, -1 }, 0, 0};
            /* Storing colocated zero information */
            ih264d_rep_mv_colz(ps_dec, &s_mvPred, ps_mv_nmb_start, 0,
                               (UWORD8)(u1_field << 1), 4, 4);
        }

        /*if num _cores is set to 3 ,compute bs will be done in another thread*/
        if(ps_dec->u4_num_cores < 3)
        {
            if(ps_dec->u4_app_disable_deblk_frm == 0)
                ps_dec->pf_compute_bs(ps_dec, ps_cur_mb_info,
                                     (UWORD16)(i >> u1_mbaff));
        }
    }
    return OK;
}
/*!
 **************************************************************************
 * \if Function name : ih264d_get_implicit_weights \endif
 *
 * \brief
 *    Calculates Implicit Weights.
 *
 * \return
 *    None
 *
 **************************************************************************
 */
void ih264d_get_implicit_weights(dec_struct_t *ps_dec)
{
    UWORD32 *pu4_iwt_ofst;
    UWORD8 i, j;
    struct pic_buffer_t *ps_pic_buff0, *ps_pic_buff1;
    WORD16 i2_dist_scale_factor;
    WORD16 i2_tb, i2_td, i2_tx;
    WORD64 i8_tb, i8_td;
    WORD32 i4_poc0, i4_poc1;
    UWORD32 ui_temp0, ui_temp1;
    UWORD8 uc_num_ref_idx_l0_active, uc_num_ref_idx_l1_active;

    pu4_iwt_ofst = ps_dec->pu4_wts_ofsts_mat;
    uc_num_ref_idx_l0_active =
                    ps_dec->ps_cur_slice->u1_num_ref_idx_lx_active[0];
    uc_num_ref_idx_l1_active =
                    ps_dec->ps_cur_slice->u1_num_ref_idx_lx_active[1];

    for(i = 0; i < uc_num_ref_idx_l0_active; i++)
    {
        ps_pic_buff0 = ps_dec->ps_ref_pic_buf_lx[0][i];
        i4_poc0 = ps_pic_buff0->i4_avg_poc;
        for(j = 0; j < uc_num_ref_idx_l1_active; j++)
        {
            ps_pic_buff1 = ps_dec->ps_ref_pic_buf_lx[1][j];
            i4_poc1 = ps_pic_buff1->i4_avg_poc;

            if(i4_poc1 != i4_poc0)
            {
                i8_tb = (WORD64)ps_dec->ps_cur_pic->i4_poc - i4_poc0;
                i2_tb = CLIP_S8(i8_tb);
                i8_td = (WORD64)i4_poc1 - i4_poc0;
                i2_td = CLIP_S8(i8_td);
                i2_tx = (16384 + ABS(SIGN_POW2_DIV(i2_td, 1))) / i2_td;
                i2_dist_scale_factor = CLIP_S11(
                                            (((i2_tb * i2_tx) + 32) >> 6));

                if(/*((u4_poc1 - u4_poc0) == 0) ||*/
                (!(ps_pic_buff1->u1_is_short && ps_pic_buff0->u1_is_short))
                                || ((i2_dist_scale_factor >> 2) < -64)
                                || ((i2_dist_scale_factor >> 2) > 128))
                {
                    /* same for forward and backward, wt=32 and Offset = 0 */
                    ui_temp0 = 0x00000020;
                    ui_temp1 = 0x00000020;
                }
                else
                {
                    ui_temp0 = 64 - (i2_dist_scale_factor >> 2);
                    ui_temp1 = (i2_dist_scale_factor >> 2);
                }
            }
            else
            {
                ui_temp0 = 0x00000020;
                ui_temp1 = 0x00000020;
            }
            pu4_iwt_ofst[0] = pu4_iwt_ofst[2] = pu4_iwt_ofst[4] = ui_temp0;
            pu4_iwt_ofst[1] = pu4_iwt_ofst[3] = pu4_iwt_ofst[5] = ui_temp1;
            pu4_iwt_ofst += 6;
        }
    }
    if(ps_dec->ps_cur_slice->u1_mbaff_frame_flag)
    {
        UWORD8 k;
        WORD32 i4_cur_poc = ps_dec->ps_cur_pic->i4_top_field_order_cnt;
        UWORD32* pu4_wt_mat = ps_dec->pu4_mbaff_wt_mat;
        /* Form the Implicit Weighted prediction matrix for field MBs also */
        for(k = 0; k < 2; k++)
        {
            for(i = 0; i < (uc_num_ref_idx_l0_active << 1); i++)
            {
                UWORD16 u2_l0_idx;

                /*u2_l0_idx = (i >= uc_num_ref_idx_l0_active)
                 ?(MAX_REF_BUFS + i - uc_num_ref_idx_l0_active) : (i) ;*/

                u2_l0_idx = i >> 1;
                if((i & 0x01) != k)
                {
                    u2_l0_idx += MAX_REF_BUFS;
                }
                ps_pic_buff0 = ps_dec->ps_ref_pic_buf_lx[0][u2_l0_idx];
                i4_poc0 = ps_pic_buff0->i4_poc;
                for(j = 0; j < (uc_num_ref_idx_l1_active << 1); j++)
                {
                    UWORD16 u2_l1_idx;
                    /*u2_l1_idx = (j >= uc_num_ref_idx_l1_active)
                     ? (MAX_REF_BUFS + j - uc_num_ref_idx_l1_active ) : (j) ;*/

                    u2_l1_idx = j >> 1;
                    if((j & 0x01) != k)
                    {
                        u2_l1_idx += MAX_REF_BUFS;
                    }
                    ps_pic_buff1 = ps_dec->ps_ref_pic_buf_lx[1][u2_l1_idx];
                    i4_poc1 = ps_pic_buff1->i4_poc;
                    if(i4_poc1 != i4_poc0)
                    {
                        i8_tb = (WORD64)i4_cur_poc - i4_poc0;
                        i2_tb = CLIP_S8(i8_tb);
                        i8_td = (WORD64)i4_poc1 - i4_poc0;
                        i2_td = CLIP_S8(i8_td);
                        i2_tx = (16384 + ABS(SIGN_POW2_DIV(i2_td, 1)))
                                        / i2_td;
                        i2_dist_scale_factor = CLIP_S11(
                                                    (((i2_tb * i2_tx) + 32) >> 6));

                        if(/*((u4_poc1 - u4_poc0) == 0) ||*/
                        (!(ps_pic_buff1->u1_is_short && ps_pic_buff0->u1_is_short))
                                        || ((i2_dist_scale_factor >> 2) < -64)
                                        || ((i2_dist_scale_factor >> 2) > 128))
                        {
                            /* same for forward and backward, wt=32 and Offset = 0 */
                            ui_temp0 = 0x00000020;
                            ui_temp1 = 0x00000020;
                        }
                        else
                        {
                            ui_temp0 = 64 - (i2_dist_scale_factor >> 2);
                            ui_temp1 = (i2_dist_scale_factor >> 2);
                        }
                    }
                    else
                    {
                        ui_temp0 = 0x00000020;
                        ui_temp1 = 0x00000020;
                    }
                    /* Store in the weight matrix */
                    *pu4_wt_mat++ = ui_temp0;
                    *pu4_wt_mat++ = ui_temp1;
                    *pu4_wt_mat++ = ui_temp0;
                    *pu4_wt_mat++ = ui_temp1;
                    *pu4_wt_mat++ = ui_temp0;
                    *pu4_wt_mat++ = ui_temp1;

                }
            }
            i4_cur_poc = ps_dec->ps_cur_pic->i4_bottom_field_order_cnt;
        }
    }
}

/*!
 **************************************************************************
 * \if Function name : ih264d_decode_bslice \endif
 *
 * \brief
 *    Decodes a B Slice
 *
 *
 * \return
 *    0 on Success and Error code otherwise
 **************************************************************************
 */
WORD32 ih264d_parse_bslice(dec_struct_t * ps_dec, UWORD16 u2_first_mb_in_slice)
{
    dec_pic_params_t * ps_pps = ps_dec->ps_cur_pps;
    dec_slice_params_t * ps_slice = ps_dec->ps_cur_slice;
    dec_bit_stream_t * ps_bitstrm = ps_dec->ps_bitstrm;
    UWORD8 u1_ref_idx_re_flag_lx;
    UWORD32 *pu4_bitstrm_buf = ps_bitstrm->pu4_buffer;
    UWORD32 *pu4_bitstrm_ofst = &ps_bitstrm->u4_ofst;

    UWORD64 u8_ref_idx_l0, u8_ref_idx_l1;
    UWORD32 u4_temp, ui_temp1;
    WORD32 i_temp;
    WORD32 ret;

    /*--------------------------------------------------------------------*/
    /* Read remaining contents of the slice header                        */
    /*--------------------------------------------------------------------*/
    {
        WORD8 *pi1_buf;
        WORD16 *pi2_mv = ps_dec->s_default_mv_pred.i2_mv;
        WORD32 *pi4_mv = (WORD32*)pi2_mv;
        WORD16 *pi16_refFrame;
        pi1_buf = ps_dec->s_default_mv_pred.i1_ref_frame;
        pi16_refFrame = (WORD16*)pi1_buf;
        *pi4_mv = 0;
        *(pi4_mv + 1) = 0;
        *pi16_refFrame = OUT_OF_RANGE_REF;
        ps_dec->s_default_mv_pred.u1_col_ref_pic_idx = (UWORD8)-1;
        ps_dec->s_default_mv_pred.u1_pic_type = (UWORD8)-1;
    }

    ps_slice->u1_num_ref_idx_active_override_flag = ih264d_get_bit_h264(
                    ps_bitstrm);
    COPYTHECONTEXT("SH: num_ref_idx_override_flag",
                    ps_slice->u1_num_ref_idx_active_override_flag);

    u8_ref_idx_l0 = ps_dec->ps_cur_pps->u1_num_ref_idx_lx_active[0];
    u8_ref_idx_l1 = ps_dec->ps_cur_pps->u1_num_ref_idx_lx_active[1];
    if(ps_slice->u1_num_ref_idx_active_override_flag)
    {
        u8_ref_idx_l0 = (UWORD64)1 + ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf);
        COPYTHECONTEXT("SH: num_ref_idx_l0_active_minus1",
                        u8_ref_idx_l0 - 1);

        u8_ref_idx_l1 = (UWORD64)1 + ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf);
        COPYTHECONTEXT("SH: num_ref_idx_l1_active_minus1",
                        u8_ref_idx_l1 - 1);
    }

    {
        UWORD8 u1_max_ref_idx = H264_MAX_REF_PICS;
        if(ps_slice->u1_field_pic_flag)
        {
            u1_max_ref_idx = H264_MAX_REF_PICS << 1;
        }
        if((u8_ref_idx_l0 > u1_max_ref_idx) || (u8_ref_idx_l1 > u1_max_ref_idx))
        {
            return ERROR_NUM_REF;
        }
        ps_slice->u1_num_ref_idx_lx_active[0] = u8_ref_idx_l0;
        ps_slice->u1_num_ref_idx_lx_active[1] = u8_ref_idx_l1;
    }


    ih264d_init_ref_idx_lx_b(ps_dec);
    /* Store the value for future slices in the same picture */
    ps_dec->u1_num_ref_idx_lx_active_prev =
                    ps_dec->ps_cur_slice->u1_num_ref_idx_lx_active[0];

    u1_ref_idx_re_flag_lx = ih264d_get_bit_h264(ps_bitstrm);
    COPYTHECONTEXT("SH: ref_pic_list_reordering_flag_l0",u1_ref_idx_re_flag_lx);

    /* Modified temporarily */
    if(u1_ref_idx_re_flag_lx)
    {
        WORD8 ret;
        ps_dec->ps_ref_pic_buf_lx[0] = ps_dec->ps_dpb_mgr->ps_mod_dpb[0];
        ret = ih264d_ref_idx_reordering(ps_dec, 0);
        if(ret == -1)
            return ERROR_REFIDX_ORDER_T;
    }
    else
        ps_dec->ps_ref_pic_buf_lx[0] = ps_dec->ps_dpb_mgr->ps_init_dpb[0];

    u1_ref_idx_re_flag_lx = ih264d_get_bit_h264(ps_bitstrm);
    COPYTHECONTEXT("SH: ref_pic_list_reordering_flag_l1",u1_ref_idx_re_flag_lx);

    /* Modified temporarily */
    if(u1_ref_idx_re_flag_lx)
    {
        WORD8 ret;
        ps_dec->ps_ref_pic_buf_lx[1] = ps_dec->ps_dpb_mgr->ps_mod_dpb[1];
        ret = ih264d_ref_idx_reordering(ps_dec, 1);
        if(ret == -1)
            return ERROR_REFIDX_ORDER_T;
    }
    else
        ps_dec->ps_ref_pic_buf_lx[1] = ps_dec->ps_dpb_mgr->ps_init_dpb[1];

    /* Create refIdx to POC mapping */
    {
        void **ppv_map_ref_idx_to_poc_lx;
        WORD8 idx;
        struct pic_buffer_t *ps_pic;

        ppv_map_ref_idx_to_poc_lx = ps_dec->ppv_map_ref_idx_to_poc + FRM_LIST_L0;
        ppv_map_ref_idx_to_poc_lx[0] = 0;
        ppv_map_ref_idx_to_poc_lx++;
        for(idx = 0; idx < ps_dec->ps_cur_slice->u1_num_ref_idx_lx_active[0];
                        idx++)
        {
            ps_pic = ps_dec->ps_ref_pic_buf_lx[0][idx];
            ppv_map_ref_idx_to_poc_lx[idx] = (ps_pic->pu1_buf1);
        }

        ppv_map_ref_idx_to_poc_lx = ps_dec->ppv_map_ref_idx_to_poc + FRM_LIST_L1;

        ppv_map_ref_idx_to_poc_lx[0] = 0;
        ppv_map_ref_idx_to_poc_lx++;
        for(idx = 0; idx < ps_dec->ps_cur_slice->u1_num_ref_idx_lx_active[1];
                        idx++)
        {
            ps_pic = ps_dec->ps_ref_pic_buf_lx[1][idx];
            ppv_map_ref_idx_to_poc_lx[idx] = (ps_pic->pu1_buf1);
        }

        if(ps_dec->ps_cur_slice->u1_mbaff_frame_flag)
        {
            void **ppv_map_ref_idx_to_poc_lx_t, **ppv_map_ref_idx_to_poc_lx_b;

            ppv_map_ref_idx_to_poc_lx_t = ps_dec->ppv_map_ref_idx_to_poc
                            + TOP_LIST_FLD_L0;
            ppv_map_ref_idx_to_poc_lx_b = ps_dec->ppv_map_ref_idx_to_poc
                            + BOT_LIST_FLD_L0;

            ppv_map_ref_idx_to_poc_lx_t[0] = 0;
            ppv_map_ref_idx_to_poc_lx_t++;
            ppv_map_ref_idx_to_poc_lx_b[0] = 0;
            ppv_map_ref_idx_to_poc_lx_b++;
            for(idx = 0; idx < ps_dec->ps_cur_slice->u1_num_ref_idx_lx_active[0];
                            idx++)
            {
                ps_pic = ps_dec->ps_ref_pic_buf_lx[0][idx];
                ppv_map_ref_idx_to_poc_lx_t[0] = (ps_pic->pu1_buf1);
                ppv_map_ref_idx_to_poc_lx_b[1] = (ps_pic->pu1_buf1);

                ppv_map_ref_idx_to_poc_lx_b[0] = (ps_pic->pu1_buf1) + 1;
                ppv_map_ref_idx_to_poc_lx_t[1] = (ps_pic->pu1_buf1) + 1;

                ppv_map_ref_idx_to_poc_lx_t += 2;
                ppv_map_ref_idx_to_poc_lx_b += 2;
            }

            ppv_map_ref_idx_to_poc_lx_t = ps_dec->ppv_map_ref_idx_to_poc
                            + TOP_LIST_FLD_L1;
            ppv_map_ref_idx_to_poc_lx_b = ps_dec->ppv_map_ref_idx_to_poc
                            + BOT_LIST_FLD_L1;

            ppv_map_ref_idx_to_poc_lx_t[0] = 0;
            ppv_map_ref_idx_to_poc_lx_t++;
            ppv_map_ref_idx_to_poc_lx_b[0] = 0;
            ppv_map_ref_idx_to_poc_lx_b++;
            for(idx = 0; idx < ps_dec->ps_cur_slice->u1_num_ref_idx_lx_active[1];
                            idx++)
            {
                UWORD8 u1_tmp_idx = idx << 1;
                ps_pic = ps_dec->ps_ref_pic_buf_lx[1][idx];
                ppv_map_ref_idx_to_poc_lx_t[u1_tmp_idx] = (ps_pic->pu1_buf1);
                ppv_map_ref_idx_to_poc_lx_b[u1_tmp_idx + 1] = (ps_pic->pu1_buf1);

                ppv_map_ref_idx_to_poc_lx_b[u1_tmp_idx] = (ps_pic->pu1_buf1) + 1;
                ppv_map_ref_idx_to_poc_lx_t[u1_tmp_idx + 1] = (ps_pic->pu1_buf1) + 1;

            }
        }

        if(ps_dec->u4_num_cores >= 3)
        {
            WORD32 num_entries;
            WORD32 size;
            num_entries = MAX_FRAMES;
            if((1 >= ps_dec->ps_cur_sps->u1_num_ref_frames) &&
                (0 == ps_dec->i4_display_delay))
            {
                num_entries = 1;
            }

            num_entries = ((2 * num_entries) + 1);
            num_entries *= 2;

            size = num_entries * sizeof(void *);
            size += PAD_MAP_IDX_POC * sizeof(void *);

            memcpy((void *)ps_dec->ps_parse_cur_slice->ppv_map_ref_idx_to_poc,
               ps_dec->ppv_map_ref_idx_to_poc,
               size);
        }

    }

    if(ps_dec->ps_cur_slice->u1_mbaff_frame_flag
                    && (ps_dec->ps_cur_slice->u1_field_pic_flag == 0))
    {
        ih264d_convert_frm_mbaff_list(ps_dec);
    }

    if(ps_pps->u1_wted_bipred_idc == 1)
    {
        ret = ih264d_parse_pred_weight_table(ps_slice, ps_bitstrm);
        if(ret != OK)
            return ret;
        ih264d_form_pred_weight_matrix(ps_dec);
        ps_dec->pu4_wt_ofsts = ps_dec->pu4_wts_ofsts_mat;
    }
    else if(ps_pps->u1_wted_bipred_idc == 2)
    {
        /* Implicit Weighted prediction */
        ps_slice->u2_log2Y_crwd = 0x0505;
        ps_dec->pu4_wt_ofsts = ps_dec->pu4_wts_ofsts_mat;
        ih264d_get_implicit_weights(ps_dec);
    }
    else
        ps_dec->ps_cur_slice->u2_log2Y_crwd = 0;

    ps_dec->ps_parse_cur_slice->u2_log2Y_crwd =
                    ps_dec->ps_cur_slice->u2_log2Y_crwd;

    /* G050 */
    if(ps_slice->u1_nal_ref_idc != 0)
    {
        if(!ps_dec->ps_dpb_cmds->u1_dpb_commands_read)
        {
            i_temp = ih264d_read_mmco_commands(ps_dec);
            if (i_temp < 0)
            {
                return ERROR_DBP_MANAGER_T;
            }
            ps_dec->u4_bitoffset = i_temp;
        }
        else
            ps_bitstrm->u4_ofst += ps_dec->u4_bitoffset;
    }
    /* G050 */

    if(ps_pps->u1_entropy_coding_mode == CABAC)
    {
        u4_temp = ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf);
        if(u4_temp > MAX_CABAC_INIT_IDC)
        {
            return ERROR_INV_SLICE_HDR_T;
        }
        ps_slice->u1_cabac_init_idc = u4_temp;
        COPYTHECONTEXT("SH: cabac_init_idc",ps_slice->u1_cabac_init_idc);
    }

    {
        WORD64 i8_temp;
        /* Read slice_qp_delta */
        i8_temp = (WORD64)ps_pps->u1_pic_init_qp
                            + ih264d_sev(pu4_bitstrm_ofst, pu4_bitstrm_buf);
        if((i8_temp < MIN_H264_QP) || (i8_temp > MAX_H264_QP))
        {
            return ERROR_INV_RANGE_QP_T;
        }
        ps_slice->u1_slice_qp = i8_temp;
        COPYTHECONTEXT("SH: slice_qp_delta",
                        (WORD8)(ps_slice->u1_slice_qp - ps_pps->u1_pic_init_qp));
    }

    if(ps_pps->u1_deblocking_filter_parameters_present_flag == 1)
    {
        u4_temp = ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf);
        if(u4_temp > SLICE_BOUNDARY_DBLK_DISABLED)
        {
            return ERROR_INV_SLICE_HDR_T;
        } COPYTHECONTEXT("SH: disable_deblocking_filter_idc", u4_temp);
        ps_slice->u1_disable_dblk_filter_idc = u4_temp;
        if(u4_temp != 1)
        {
            i_temp = ih264d_sev(pu4_bitstrm_ofst, pu4_bitstrm_buf)
                            << 1;
            if((MIN_DBLK_FIL_OFF > i_temp) || (i_temp > MAX_DBLK_FIL_OFF))
            {
                return ERROR_INV_SLICE_HDR_T;
            }
            ps_slice->i1_slice_alpha_c0_offset = i_temp;
            COPYTHECONTEXT("SH: slice_alpha_c0_offset_div2",
                            ps_slice->i1_slice_alpha_c0_offset >> 1);

            i_temp = ih264d_sev(pu4_bitstrm_ofst, pu4_bitstrm_buf)
                            << 1;
            if((MIN_DBLK_FIL_OFF > i_temp) || (i_temp > MAX_DBLK_FIL_OFF))
            {
                return ERROR_INV_SLICE_HDR_T;
            }
            ps_slice->i1_slice_beta_offset = i_temp;
            COPYTHECONTEXT("SH: slice_beta_offset_div2",
                            ps_slice->i1_slice_beta_offset >> 1);

        }
        else
        {
            ps_slice->i1_slice_alpha_c0_offset = 0;
            ps_slice->i1_slice_beta_offset = 0;
        }
    }
    else
    {
        ps_slice->u1_disable_dblk_filter_idc = 0;
        ps_slice->i1_slice_alpha_c0_offset = 0;
        ps_slice->i1_slice_beta_offset = 0;
    }

    ps_dec->u1_slice_header_done = 2;

    if(ps_pps->u1_entropy_coding_mode)
    {
        SWITCHOFFTRACE; SWITCHONTRACECABAC;
        ps_dec->pf_parse_inter_slice = ih264d_parse_inter_slice_data_cabac;
        ps_dec->pf_parse_inter_mb = ih264d_parse_bmb_cabac;
        ih264d_init_cabac_contexts(B_SLICE, ps_dec);

        if(ps_dec->ps_cur_slice->u1_mbaff_frame_flag)
            ps_dec->pf_get_mb_info = ih264d_get_mb_info_cabac_mbaff;
        else
            ps_dec->pf_get_mb_info = ih264d_get_mb_info_cabac_nonmbaff;
    }
    else
    {
        SWITCHONTRACE; SWITCHOFFTRACECABAC;
        ps_dec->pf_parse_inter_slice = ih264d_parse_inter_slice_data_cavlc;
        ps_dec->pf_parse_inter_mb = ih264d_parse_bmb_cavlc;
        if(ps_dec->ps_cur_slice->u1_mbaff_frame_flag)
            ps_dec->pf_get_mb_info = ih264d_get_mb_info_cavlc_mbaff;
        else
            ps_dec->pf_get_mb_info = ih264d_get_mb_info_cavlc_nonmbaff;
    }

    ret = ih264d_cal_col_pic(ps_dec);
    if(ret != OK)
        return ret;
    ps_dec->u1_B = 1;
    ps_dec->pf_mvpred_ref_tfr_nby2mb = ih264d_mv_pred_ref_tfr_nby2_bmb;
    ret = ps_dec->pf_parse_inter_slice(ps_dec, ps_slice, u2_first_mb_in_slice);
    if(ret != OK)
        return ret;
    return OK;
}