/******************************************************************************

 *

 * Copyright (C) 2022 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

 *  isvcd_parse_slice.c

 *

 * @brief

 *  Contains routines that decodes a slice NAL unit

 *

 * @author

 *  Kishore

 *

 * @remarks

 *  None

 *

 *******************************************************************************

 */

#include <string.h>

#include <assert.h>

#include "ih264_typedefs.h"

#include "ih264_macros.h"

#include "ih264_platform_macros.h"

#include "ithread.h"

#include "isvcd_structs.h"

#include "ih264d_debug.h"

#include "ih264d_bitstrm.h"

#include "ih264d_parse_mb_header.h"

#include "ih264d_process_bslice.h"

#include "ih264d_process_pslice.h"

#include "ih264d_parse_cavlc.h"

#include "ih264d_utils.h"

#include "isvcd_utils.h"

#include "ih264d_deblocking.h"

#include "ih264d_defs.h"

#include "ih264d_error_handler.h"

#include "ih264d_tables.h"

#include "ih264d_defs.h"

#include "ih264d_mem_request.h"

#include "ih264d_parse_islice.h"

#include "ih264d_parse_slice.h"

#include "ih264d_mvpred.h"

#include "ih264d_mb_utils.h"

#include "ih264d_defs.h"

#include "ih264d_quant_scaling.h"

#include "ih264d_inter_pred.h"

#include "ih264d_sei.h"

#include "ih264_error.h"

#include "ih264_disp_mgr.h"

#include "ih264_buf_mgr.h"

#include "ih264d_thread_parse_decode.h"

#include "ih264d_thread_compute_bs.h"

#include "ih264d_dpb_manager.h"

#include "ih264d_parse_islice.h"

#include "isvcd_parse_slice.h"

#include "isvcd_process_epslice.h"

#include "isvcd_process_ebslice.h"

#include "isvcd_thread_compute_bs.h"

#include "isvcd_thread_parse_decode.h"

#include "isvcd_deblocking.h"

#define RET_LAST_SKIP 0x80000000

WORD32 check_app_out_buf_size(dec_struct_t *ps_dec);

/*!

**************************************************************************

* \if Function name :  isvcd_verify_level \endif

*

* \brief

*    Initialize the Parameter required for all the slices for a picture

*

* \return           : Nothing

*

**************************************************************************

*/

WORD32 isvcd_verify_level(UWORD8 u1_level_idc)

{

    switch(u1_level_idc)

    {

        case H264_LEVEL_1_0:

        case H264_LEVEL_1_1:

        case H264_LEVEL_1_2:

        case H264_LEVEL_1_3:

        case H264_LEVEL_2_0:

        case H264_LEVEL_2_1:

        case H264_LEVEL_2_2:

        case H264_LEVEL_3_0:

        case H264_LEVEL_3_1:

        case H264_LEVEL_3_2:

        case H264_LEVEL_4_0:

        case H264_LEVEL_4_1:

        case H264_LEVEL_4_2:

        case H264_LEVEL_5_0:

        case H264_LEVEL_5_1:

            return OK;

        default:

            return NOT_OK;

    }

}

/*!

**************************************************************************

* \if Function name :  isvcd_start_of_pic \endif

*

* \brief

*    Initialize the Parameter required for all the slices for a picture

*

* \return           : Nothing

*

**************************************************************************

*/

WORD32 isvcd_start_of_pic(svc_dec_lyr_struct_t *ps_svc_lyr_dec, WORD32 i4_poc,

                          pocstruct_t *ps_temp_poc, UWORD16 u2_frame_num, dec_pic_params_t *ps_pps)

{

    dec_struct_t *ps_dec = &ps_svc_lyr_dec->s_dec;

    pocstruct_t *ps_prev_poc = &ps_dec->s_cur_pic_poc;

    pocstruct_t *ps_cur_poc = ps_temp_poc;

    dec_slice_params_t *ps_cur_slice = ps_dec->ps_cur_slice;

    dec_seq_params_t *ps_seq = ps_dec->ps_cur_sps;

    UWORD8 u1_bottom_field_flag = ps_cur_slice->u1_bottom_field_flag;

    UWORD8 u1_field_pic_flag = ps_cur_slice->u1_field_pic_flag;

    /* high profile related declarations */

    WORD32 ret;

    H264_MUTEX_LOCK(&ps_dec->process_disp_mutex);

    if(u1_field_pic_flag == 1)

    {

        ps_dec->i4_error_code = ERROR_SVC_FIELD_PIC_UNSUPPORTED;

        return ERROR_SVC_FIELD_PIC_UNSUPPORTED;

    }

    /* check output buffer size given by the application */

    if(check_app_out_buf_size(ps_dec) != IV_SUCCESS) return IVD_DISP_FRM_ZERO_OP_BUF_SIZE;

    ps_prev_poc->i4_pic_order_cnt_lsb = ps_cur_poc->i4_pic_order_cnt_lsb;

    ps_prev_poc->i4_pic_order_cnt_msb = ps_cur_poc->i4_pic_order_cnt_msb;

    ps_prev_poc->i4_delta_pic_order_cnt_bottom = ps_cur_poc->i4_delta_pic_order_cnt_bottom;

    ps_prev_poc->i4_delta_pic_order_cnt[0] = ps_cur_poc->i4_delta_pic_order_cnt[0];

    ps_prev_poc->i4_delta_pic_order_cnt[1] = ps_cur_poc->i4_delta_pic_order_cnt[1];

    ps_prev_poc->u1_bot_field = ps_dec->ps_cur_slice->u1_bottom_field_flag;

    ps_prev_poc->i4_prev_frame_num_ofst = ps_cur_poc->i4_prev_frame_num_ofst;

    ps_prev_poc->u2_frame_num = u2_frame_num;

    ps_dec->i1_prev_mb_qp_delta = 0;

    ps_dec->i1_next_ctxt_idx = 0;

    ps_dec->u4_nmb_deblk = 0;

    if(ps_dec->u4_num_cores == 1) ps_dec->u4_nmb_deblk = 1;

    if(ps_seq->u1_mb_aff_flag == 1)

    {

        ps_dec->u4_nmb_deblk = 0;

        if(ps_dec->u4_num_cores > 2) ps_dec->u4_num_cores = 2;

    }

    ps_dec->u4_use_intrapred_line_copy = 0;

    if(ps_seq->u1_mb_aff_flag == 0)

    {

        ps_dec->u4_use_intrapred_line_copy = 1;

    }

    ps_dec->u4_app_disable_deblk_frm = 0;

    /* If degrade is enabled, set the degrade flags appropriately */

    if(ps_dec->i4_degrade_type && ps_dec->i4_degrade_pics)

    {

        WORD32 degrade_pic;

        ps_dec->i4_degrade_pic_cnt++;

        degrade_pic = 0;

        /* If degrade is to be done in all frames, then do not check further */

        switch(ps_dec->i4_degrade_pics)

        {

            case 4:

            {

                degrade_pic = 1;

                break;

            }

            case 3:

            {

                if(ps_cur_slice->u1_slice_type != I_SLICE) degrade_pic = 1;

                break;

            }

            case 2:

            {

                /* If pic count hits non-degrade interval or it is an islice, then do not

                 * degrade */

                if((ps_cur_slice->u1_slice_type != I_SLICE) &&

                   (ps_dec->i4_degrade_pic_cnt != ps_dec->i4_nondegrade_interval))

                    degrade_pic = 1;

                break;

            }

            case 1:

            {

                /* Check if the current picture is non-ref */

                if(0 == ps_cur_slice->u1_nal_ref_idc)

                {

                    degrade_pic = 1;

                }

                break;

            }

        }

        if(degrade_pic)

        {

            if(ps_dec->i4_degrade_type & 0x2) ps_dec->u4_app_disable_deblk_frm = 1;

            /* MC degrading is done only for non-ref pictures */

            if(0 == ps_cur_slice->u1_nal_ref_idc)

            {

                if(ps_dec->i4_degrade_type & 0x4) ps_dec->i4_mv_frac_mask = 0;

                if(ps_dec->i4_degrade_type & 0x8) ps_dec->i4_mv_frac_mask = 0;

            }

        }

        else

            ps_dec->i4_degrade_pic_cnt = 0;

    }

    {

        dec_err_status_t *ps_err = ps_dec->ps_dec_err_status;

        if((ps_cur_slice->u1_slice_type == I_SLICE) || (ps_cur_slice->u1_slice_type == SI_SLICE))

            ps_err->u1_cur_pic_type = PIC_TYPE_I;

        else

            ps_err->u1_cur_pic_type = PIC_TYPE_UNKNOWN;

        if(ps_err->u1_pic_aud_i == PIC_TYPE_I)

        {

            ps_err->u1_cur_pic_type = PIC_TYPE_I;

            ps_err->u1_pic_aud_i = PIC_TYPE_UNKNOWN;

        }

        if(ps_cur_slice->u1_nal_unit_type == IDR_SLICE_NAL)

        {

            if(ps_err->u1_err_flag) ih264d_reset_ref_bufs(ps_dec->ps_dpb_mgr);

            ps_err->u1_err_flag = ACCEPT_ALL_PICS;

        }

    }

    if(ps_dec->u1_init_dec_flag && ps_dec->s_prev_seq_params.u1_eoseq_pending)

    {

        /* Reset the decoder picture buffers */

        WORD32 j;

        for(j = 0; j < MAX_DISP_BUFS_NEW; j++)

        {

            ih264_buf_mgr_release((buf_mgr_t *) ps_dec->pv_pic_buf_mgr, j, BUF_MGR_REF);

            ih264_buf_mgr_release((buf_mgr_t *) ps_dec->pv_mv_buf_mgr,

                                  ps_dec->as_buf_id_info_map[j].mv_buf_id, BUF_MGR_REF);

            ih264_buf_mgr_release((buf_mgr_t *) ps_dec->pv_pic_buf_mgr, j, BUF_MGR_IO);

        }

        /* reset the decoder structure parameters related to buffer handling */

        ps_dec->u1_second_field = 0;

        ps_dec->i4_cur_display_seq = 0;

        /********************************************************************/

        /* indicate in the decoder output i4_status that some frames are being */

        /* dropped, so that it resets timestamp and wait for a new sequence */

        /********************************************************************/

        ps_dec->s_prev_seq_params.u1_eoseq_pending = 0;

    }

    ret = isvcd_init_pic(ps_svc_lyr_dec, u2_frame_num, i4_poc, ps_pps);

    if(ret != OK) return ret;

    ps_dec->pv_parse_tu_coeff_data = ps_dec->pv_pic_tu_coeff_data;

    ps_dec->pv_proc_tu_coeff_data = ps_dec->pv_pic_tu_coeff_data;

    ps_dec->ps_nmb_info = ps_dec->ps_frm_mb_info;

    ps_svc_lyr_dec->ps_svc_nmb_info = ps_svc_lyr_dec->ps_svc_frm_mb_info;

    if(ps_dec->u1_separate_parse)

    {

        UWORD32 num_mbs;

        num_mbs = ps_dec->ps_cur_sps->u4_total_num_of_mbs

                  << (1 - ps_dec->ps_cur_sps->u1_frame_mbs_only_flag);

        if(ps_dec->pu1_dec_mb_map)

        {

            memset((void *) ps_dec->pu1_dec_mb_map, 0, num_mbs);

        }

        if(ps_dec->pu1_recon_mb_map)

        {

            memset((void *) ps_dec->pu1_recon_mb_map, 0, num_mbs);

        }

        if(ps_dec->pu2_slice_num_map)

        {

            memset((void *) ps_dec->pu2_slice_num_map, 0, (num_mbs * sizeof(UWORD16)));

        }

    }

    ps_dec->ps_parse_cur_slice = &(ps_dec->ps_dec_slice_buf[0]);

    ps_dec->ps_decode_cur_slice = &(ps_dec->ps_dec_slice_buf[0]);

    ps_dec->ps_computebs_cur_slice = &(ps_dec->ps_dec_slice_buf[0]);

    ps_dec->u2_cur_slice_num = 0;

    /* Initialize all the HP toolsets to zero */

    ps_dec->s_high_profile.u1_scaling_present = 0;

    ps_dec->s_high_profile.u1_transform8x8_present = 0;

    /* Get Next Free Picture */

    if(1 == ps_dec->u4_share_disp_buf)

    {

        UWORD32 i;

        /* Free any buffer that is in the queue to be freed */

        for(i = 0; i < MAX_DISP_BUFS_NEW; i++)

        {

            if(0 == ps_dec->u4_disp_buf_to_be_freed[i]) continue;

            ih264_buf_mgr_release((buf_mgr_t *) ps_dec->pv_pic_buf_mgr, i, BUF_MGR_IO);

            ps_dec->u4_disp_buf_to_be_freed[i] = 0;

            ps_dec->u4_disp_buf_mapping[i] = 0;

        }

    }

    if(!(u1_field_pic_flag && 0 != ps_dec->u1_top_bottom_decoded))

    {

        pic_buffer_t *ps_cur_pic;

        WORD32 cur_pic_buf_id, cur_mv_buf_id;

        col_mv_buf_t *ps_col_mv;

        while(1)

        {

            ps_cur_pic = (pic_buffer_t *) ih264_buf_mgr_get_next_free(

                (buf_mgr_t *) ps_dec->pv_pic_buf_mgr, &cur_pic_buf_id);

            /* In case of IDR slices, if there is no free picture buffer, then release

             * all buffers from display and reference

             */

            if((ps_cur_pic == NULL) && (ps_cur_slice->u1_nal_unit_type == IDR_SLICE_NAL))

            {

                WORD32 j;

                for(j = 0; j < MAX_DISP_BUFS_NEW; j++)

                {

                    ih264_buf_mgr_release((buf_mgr_t *) ps_dec->pv_pic_buf_mgr, j, BUF_MGR_REF);

                    ih264_buf_mgr_release((buf_mgr_t *) ps_dec->pv_mv_buf_mgr,

                                          ps_dec->as_buf_id_info_map[j].mv_buf_id, BUF_MGR_REF);

                    ih264_buf_mgr_release((buf_mgr_t *) ps_dec->pv_pic_buf_mgr, j, BUF_MGR_IO);

                }

                ps_cur_pic = (pic_buffer_t *) ih264_buf_mgr_get_next_free(

                    (buf_mgr_t *) ps_dec->pv_pic_buf_mgr, &cur_pic_buf_id);

            }

            if(ps_cur_pic == NULL)

            {

                ps_dec->i4_error_code = ERROR_UNAVAIL_PICBUF_T;

                ps_dec->ps_dec_err_status->u1_err_flag |= REJECT_CUR_PIC;

                return ERROR_UNAVAIL_PICBUF_T;

            }

            if(0 == ps_dec->u4_disp_buf_mapping[cur_pic_buf_id])

            {

                break;

            }

        }

        ps_col_mv = (col_mv_buf_t *) ih264_buf_mgr_get_next_free(

            (buf_mgr_t *) ps_dec->pv_mv_buf_mgr, &cur_mv_buf_id);

        if(ps_col_mv == NULL)

        {

            ps_dec->i4_error_code = ERROR_UNAVAIL_MVBUF_T;

            ps_dec->ps_dec_err_status->u1_err_flag |= REJECT_CUR_PIC;

            return ERROR_UNAVAIL_MVBUF_T;

        }

        ps_dec->ps_cur_pic = ps_cur_pic;

        ps_dec->u1_pic_buf_id = cur_pic_buf_id;

        ps_cur_pic->u4_ts = ps_dec->u4_ts;

        memcpy(&ps_cur_pic->s_sei_pic, ps_dec->ps_sei, sizeof(sei));

        ps_cur_pic->u1_mv_buf_id = cur_mv_buf_id;

        ps_dec->as_buf_id_info_map[cur_pic_buf_id].mv_buf_id = cur_mv_buf_id;

        if(ps_dec->u1_enable_mb_info)

        {

            UWORD32 mb_info_map_size = ps_dec->u4_total_mbs << 2;

            ps_dec->as_buf_id_info_map[cur_pic_buf_id].pu1_qp_map =

                ps_dec->pu1_qp_map_base + cur_pic_buf_id * mb_info_map_size;

            ps_dec->as_buf_id_info_map[cur_pic_buf_id].pu1_mb_type_map =

                ps_dec->pu1_mb_type_map_base + cur_pic_buf_id * mb_info_map_size;

            memset(ps_dec->as_buf_id_info_map[cur_pic_buf_id].pu1_qp_map, 0, mb_info_map_size);

            memset(ps_dec->as_buf_id_info_map[cur_pic_buf_id].pu1_mb_type_map, 0, mb_info_map_size);

        }

        ps_cur_pic->pu1_col_zero_flag = (UWORD8 *) ps_col_mv->pv_col_zero_flag;

        ps_cur_pic->ps_mv = (mv_pred_t *) ps_col_mv->pv_mv;

        ps_dec->au1_pic_buf_ref_flag[cur_pic_buf_id] = 0;

        {

            /*make first entry of list0 and list1 point to cur pic,

             *so that if first slice is in error, ref pic struct will have valid

             *entries*/

            ps_dec->ps_ref_pic_buf_lx[0] = ps_dec->ps_dpb_mgr->ps_init_dpb[0];

            ps_dec->ps_ref_pic_buf_lx[1] = ps_dec->ps_dpb_mgr->ps_init_dpb[1];

            *(ps_dec->ps_dpb_mgr->ps_init_dpb[0][0]) = *ps_cur_pic;

            /* Initialize for field reference as well */

            *(ps_dec->ps_dpb_mgr->ps_init_dpb[0][MAX_REF_BUFS]) = *ps_cur_pic;

            *(ps_dec->ps_dpb_mgr->ps_mod_dpb[0][0]) = *ps_cur_pic;

            /* Initialize for field reference as well */

            *(ps_dec->ps_dpb_mgr->ps_mod_dpb[0][MAX_REF_BUFS]) = *ps_cur_pic;

            *(ps_dec->ps_dpb_mgr->ps_init_dpb[1][0]) = *ps_cur_pic;

            /* Initialize for field reference as well */

            *(ps_dec->ps_dpb_mgr->ps_init_dpb[1][MAX_REF_BUFS]) = *ps_cur_pic;

            *(ps_dec->ps_dpb_mgr->ps_mod_dpb[1][0]) = *ps_cur_pic;

            /* Initialize for field reference as well */

            *(ps_dec->ps_dpb_mgr->ps_mod_dpb[1][MAX_REF_BUFS]) = *ps_cur_pic;

        }

        ps_dec->ps_cur_pic->u1_picturetype = u1_field_pic_flag;

        ps_dec->ps_cur_pic->u4_pack_slc_typ = SKIP_NONE;

        H264_DEC_DEBUG_PRINT("got a buffer\n");

    }

    else

    {

        H264_DEC_DEBUG_PRINT("did not get a buffer\n");

    }

    ps_dec->u4_pic_buf_got = 1;

    ps_dec->ps_cur_pic->i4_poc = i4_poc;

    ps_dec->ps_cur_pic->i4_frame_num = u2_frame_num;

    ps_dec->ps_cur_pic->i4_pic_num = u2_frame_num;

    ps_dec->ps_cur_pic->i4_top_field_order_cnt = ps_pps->i4_top_field_order_cnt;

    ps_dec->ps_cur_pic->i4_bottom_field_order_cnt = ps_pps->i4_bottom_field_order_cnt;

    ps_dec->ps_cur_pic->i4_avg_poc = ps_pps->i4_avg_poc;

    ps_dec->ps_cur_pic->u4_time_stamp = ps_dec->u4_pts;

    ps_dec->s_cur_pic = *(ps_dec->ps_cur_pic);

    if(u1_field_pic_flag && u1_bottom_field_flag)

    {

        WORD32 i4_temp_poc;

        WORD32 i4_top_field_order_poc, i4_bot_field_order_poc;

        /* Point to odd lines, since it's bottom field */

        ps_dec->s_cur_pic.pu1_buf1 += ps_dec->s_cur_pic.u2_frm_wd_y;

        ps_dec->s_cur_pic.pu1_buf2 += ps_dec->s_cur_pic.u2_frm_wd_uv;

        ps_dec->s_cur_pic.pu1_buf3 += ps_dec->s_cur_pic.u2_frm_wd_uv;

        ps_dec->s_cur_pic.ps_mv += ((ps_dec->u2_pic_ht * ps_dec->u2_pic_wd) >> 5);

        ps_dec->s_cur_pic.pu1_col_zero_flag += ((ps_dec->u2_pic_ht * ps_dec->u2_pic_wd) >> 5);

        ps_dec->ps_cur_pic->u1_picturetype |= BOT_FLD;

        i4_top_field_order_poc = ps_dec->ps_cur_pic->i4_top_field_order_cnt;

        i4_bot_field_order_poc = ps_dec->ps_cur_pic->i4_bottom_field_order_cnt;

        i4_temp_poc = MIN(i4_top_field_order_poc, i4_bot_field_order_poc);

        ps_dec->ps_cur_pic->i4_avg_poc = i4_temp_poc;

    }

    ps_cur_slice->u1_mbaff_frame_flag = ps_seq->u1_mb_aff_flag && (!u1_field_pic_flag);

    ps_dec->ps_cur_pic->u1_picturetype |= (ps_cur_slice->u1_mbaff_frame_flag << 2);

    ps_dec->ps_cur_mb_row = ps_dec->ps_nbr_mb_row;

    ps_dec->ps_cur_mb_row += 2;

    ps_dec->ps_top_mb_row = ps_dec->ps_nbr_mb_row;

    ps_dec->ps_top_mb_row +=

        ((ps_dec->u2_frm_wd_in_mbs + 2) << (1 - ps_dec->ps_cur_sps->u1_frame_mbs_only_flag));

    // Increment by 2 ,so that left mb (mbaff decrements by 2)  will always be valid

    ps_dec->ps_top_mb_row += 2;

    ps_dec->ps_mv_cur = ps_dec->s_cur_pic.ps_mv;

    ps_dec->ps_mv_top = ps_dec->ps_mv_top_p[0];

    ps_dec->u1_mv_top_p = 0;

    ps_dec->u4_mb_idx = 0;

    ps_dec->ps_mv_left = ps_dec->s_cur_pic.ps_mv;

    ps_dec->u4_total_mbs_coded = 0;

    ps_dec->i4_submb_ofst = -(SUB_BLK_SIZE);

    ps_dec->u4_pred_info_idx = 0;

    ps_dec->u4_pred_info_pkd_idx = 0;

    ps_dec->u4_dma_buf_idx = 0;

    ps_dec->ps_mv = ps_dec->s_cur_pic.ps_mv;

    ps_dec->ps_mv_bank_cur = ps_dec->s_cur_pic.ps_mv;

    ps_dec->pu1_col_zero_flag = ps_dec->s_cur_pic.pu1_col_zero_flag;

    ps_dec->ps_part = ps_dec->ps_parse_part_params;

    ps_dec->i2_prev_slice_mbx = -1;

    ps_dec->i2_prev_slice_mby = 0;

    ps_dec->u2_mv_2mb[0] = 0;

    ps_dec->u2_mv_2mb[1] = 0;

    ps_dec->u1_last_pic_not_decoded = 0;

    ps_dec->u2_cur_slice_num_dec_thread = 0;

    ps_dec->u2_cur_slice_num_bs = 0;

    ps_dec->u4_intra_pred_line_ofst = 0;

    ps_dec->pu1_cur_y_intra_pred_line = ps_dec->pu1_y_intra_pred_line;

    ps_dec->pu1_cur_u_intra_pred_line = ps_dec->pu1_u_intra_pred_line;

    ps_dec->pu1_cur_v_intra_pred_line = ps_dec->pu1_v_intra_pred_line;

    ps_dec->pu1_cur_y_intra_pred_line_base = ps_dec->pu1_y_intra_pred_line;

    ps_dec->pu1_cur_u_intra_pred_line_base = ps_dec->pu1_u_intra_pred_line;

    ps_dec->pu1_cur_v_intra_pred_line_base = ps_dec->pu1_v_intra_pred_line;

    ps_dec->pu1_prev_y_intra_pred_line =

        ps_dec->pu1_y_intra_pred_line + (ps_dec->u2_frm_wd_in_mbs * MB_SIZE);

    ps_dec->pu1_prev_u_intra_pred_line =

        ps_dec->pu1_u_intra_pred_line + ps_dec->u2_frm_wd_in_mbs * BLK8x8SIZE * YUV420SP_FACTOR;

    ps_dec->pu1_prev_v_intra_pred_line =

        ps_dec->pu1_v_intra_pred_line + ps_dec->u2_frm_wd_in_mbs * BLK8x8SIZE;

    ps_dec->ps_deblk_mbn = ps_dec->ps_deblk_pic;

    /* Initialize The Function Pointer Depending Upon the Entropy and MbAff Flag

     */

    {

        if(ps_cur_slice->u1_mbaff_frame_flag)

        {

            ps_dec->pf_compute_bs = ih264d_compute_bs_mbaff;

            ps_dec->pf_mvpred = ih264d_mvpred_mbaff;

            ps_svc_lyr_dec->pf_svc_compute_bs = isvcd_compute_bs_non_mbaff;

        }

        else

        {

            ps_dec->pf_compute_bs = ih264d_compute_bs_non_mbaff;

            ps_svc_lyr_dec->pf_svc_compute_bs = isvcd_compute_bs_non_mbaff;

            ps_dec->u1_cur_mb_fld_dec_flag = ps_cur_slice->u1_field_pic_flag;

            if((ps_svc_lyr_dec->u1_layer_identifier == TARGET_LAYER) &&

               (0 == ps_svc_lyr_dec->u1_base_res_flag))

            {

                ps_svc_lyr_dec->pf_svc_compute_bs = isvcd_compute_bs_non_mbaff_target_lyr;

            }

            if((ps_svc_lyr_dec->u1_layer_identifier == TARGET_LAYER) &&

               (1 == ps_svc_lyr_dec->u1_base_res_flag))

            {

                ps_svc_lyr_dec->pf_svc_compute_bs =

                    isvcd_compute_bs_non_mbaff_target_lyr_no_inter_layer;

            }

            if((ps_svc_lyr_dec->u1_layer_identifier == MEDIAL_ENHANCEMENT_LAYER) &&

               (0 == ps_svc_lyr_dec->u1_base_res_flag))

            {

                ps_svc_lyr_dec->pf_svc_compute_bs = isvcd_compute_bs_non_mbaff_medial_lyr;

            }

        }

    }

    /* Set up the Parameter for DMA transfer */

    {

        UWORD8 u1_field_pic_flag = ps_dec->ps_cur_slice->u1_field_pic_flag;

        UWORD8 u1_mbaff = ps_cur_slice->u1_mbaff_frame_flag;

        UWORD8 uc_lastmbs = (((ps_dec->u2_pic_wd) >> 4) % (ps_dec->u4_recon_mb_grp >> u1_mbaff));

        UWORD16 ui16_lastmbs_widthY =

            (uc_lastmbs ? (uc_lastmbs << 4) : ((ps_dec->u4_recon_mb_grp >> u1_mbaff) << 4));

        UWORD16 ui16_lastmbs_widthUV =

            uc_lastmbs ? (uc_lastmbs << 3) : ((ps_dec->u4_recon_mb_grp >> u1_mbaff) << 3);

        ps_dec->s_tran_addrecon.pu1_dest_y = ps_dec->s_cur_pic.pu1_buf1;

        ps_dec->s_tran_addrecon.pu1_dest_u = ps_dec->s_cur_pic.pu1_buf2;

        ps_dec->s_tran_addrecon.pu1_dest_v = ps_dec->s_cur_pic.pu1_buf3;

        ps_dec->s_tran_addrecon.u2_frm_wd_y = ps_dec->u2_frm_wd_y << u1_field_pic_flag;

        ps_dec->s_tran_addrecon.u2_frm_wd_uv = ps_dec->u2_frm_wd_uv << u1_field_pic_flag;

        if(u1_field_pic_flag)

        {

            ui16_lastmbs_widthY += ps_dec->u2_frm_wd_y;

            ui16_lastmbs_widthUV += ps_dec->u2_frm_wd_uv;

        }

        /* Normal Increment of Pointer */

        ps_dec->s_tran_addrecon.u4_inc_y[0] = ((ps_dec->u4_recon_mb_grp << 4) >> u1_mbaff);

        ps_dec->s_tran_addrecon.u4_inc_uv[0] = ((ps_dec->u4_recon_mb_grp << 4) >> u1_mbaff);

        /* End of Row Increment */

        ps_dec->s_tran_addrecon.u4_inc_y[1] =

            (ui16_lastmbs_widthY + (PAD_LEN_Y_H << 1) +

             ps_dec->s_tran_addrecon.u2_frm_wd_y * ((15 << u1_mbaff) + u1_mbaff));

        ps_dec->s_tran_addrecon.u4_inc_uv[1] =

            (ui16_lastmbs_widthUV + (PAD_LEN_UV_H << 2) +

             ps_dec->s_tran_addrecon.u2_frm_wd_uv * ((15 << u1_mbaff) + u1_mbaff));

        /* Assign picture numbers to each frame/field  */

        /* only once per picture.                      */

        ih264d_assign_pic_num(ps_dec);

        ps_dec->s_tran_addrecon.u2_mv_top_left_inc =

            (ps_dec->u4_recon_mb_grp << 2) - 1 - (u1_mbaff << 2);

        ps_dec->s_tran_addrecon.u2_mv_left_inc = ((ps_dec->u4_recon_mb_grp >> u1_mbaff) - 1)

                                                 << (4 + u1_mbaff);

    }

    /**********************************************************************/

    /* High profile related initialization at pictrue level               */

    /**********************************************************************/

    if((ps_seq->u1_profile_idc == HIGH_PROFILE_IDC) ||

       (ps_seq->u1_profile_idc == SCALABLE_HIGH_PROFILE_IDC) ||

       (ps_seq->u1_profile_idc == SCALABLE_BASELINE_PROFILE_IDC))

    {

        if((ps_seq->i4_seq_scaling_matrix_present_flag) ||

           (ps_pps->i4_pic_scaling_matrix_present_flag))

        {

            ret = ih264d_form_scaling_matrix_picture(ps_seq, ps_pps, ps_dec);

            ps_dec->s_high_profile.u1_scaling_present = 1;

        }

        else

        {

            ret = ih264d_form_default_scaling_matrix(ps_dec);

        }

        if(ps_pps->i4_transform_8x8_mode_flag)

        {

            ps_dec->s_high_profile.u1_transform8x8_present = 1;

        }

    }

    else

    {

        ret = ih264d_form_default_scaling_matrix(ps_dec);

    }

    if(ret != OK) return ret;

    /* required while reading the transform_size_8x8 u4_flag */

    ps_dec->s_high_profile.u1_direct_8x8_inference_flag = ps_seq->u1_direct_8x8_inference_flag;

    ps_dec->s_high_profile.s_cavlc_ctxt = ps_dec->s_cavlc_ctxt;

    ps_dec->i1_recon_in_thread3_flag = 1;

    ps_dec->ps_frame_buf_ip_recon = &ps_dec->s_tran_addrecon;

    if(ps_dec->u1_separate_parse)

    {

        memcpy(&ps_dec->s_tran_addrecon_parse, &ps_dec->s_tran_addrecon, sizeof(tfr_ctxt_t));

    }

    ih264d_init_deblk_tfr_ctxt(ps_dec, &(ps_dec->s_pad_mgr), &(ps_dec->s_tran_addrecon),

                               ps_dec->u2_frm_wd_in_mbs, 0);

    ps_dec->ps_cur_deblk_mb = ps_dec->ps_deblk_pic;

    ps_dec->u4_cur_deblk_mb_num = 0;

    ps_dec->u4_deblk_mb_x = 0;

    ps_dec->u4_deblk_mb_y = 0;

    ps_dec->pu4_wt_ofsts = ps_dec->pu4_wts_ofsts_mat;

    ps_dec->u4_first_slice_in_pic = 0;

    H264_MUTEX_UNLOCK(&ps_dec->process_disp_mutex);

    return OK;

}

/*!

**************************************************************************

* \if Function name : isvcd_parse_decode_slice_ext_nal \endif

*

* \brief

*    Parses a slice extension NAL

*

* \return

*    0 on Success and Error code otherwise

**************************************************************************

*/

WORD32 isvcd_parse_decode_slice_ext_nal(UWORD8 u1_is_idr_slice, UWORD8 u1_nal_ref_idc,

                                        svc_dec_lyr_struct_t *ps_svc_lyr_dec)

{

    dec_struct_t *ps_dec = &ps_svc_lyr_dec->s_dec;

    dec_bit_stream_t *ps_bitstrm = ps_dec->ps_bitstrm;

    dec_pic_params_t *ps_pps;

    dec_seq_params_t *ps_seq;

    dec_svc_seq_params_t *ps_subset_seq;

    dec_slice_params_t *ps_cur_slice = NULL;

    dec_slice_svc_ext_params_t *ps_svc_slice_params = NULL;

    pocstruct_t s_tmp_poc = {0};

    WORD32 i_delta_poc[2] = {0};

    WORD32 i4_poc = 0;

    UWORD16 u2_first_mb_in_slice, u2_frame_num;

    UWORD8 u1_field_pic_flag, u1_redundant_pic_cnt = 0, u1_slice_type;

    UWORD32 u4_idr_pic_id = 0;

    UWORD8 u1_bottom_field_flag, u1_pic_order_cnt_type;

    UWORD8 u1_nal_unit_type;

    UWORD32 *pu4_bitstrm_buf = ps_bitstrm->pu4_buffer;

    UWORD32 *pu4_bitstrm_ofst = &ps_bitstrm->u4_ofst;

    WORD8 i1_is_end_of_poc;

    WORD32 ret;

    WORD32 prev_slice_err, num_mb_skipped;

    UWORD8 u1_mbaff;

    pocstruct_t *ps_cur_poc;

    UWORD32 u4_temp;

    WORD32 i_temp;

    svc_dec_ctxt_t *psvcd_dec_ctxt;

    dec_struct_t *ps_dec_cur_lyr_minus_1;

    svc_dec_lyr_struct_t *ps_svc_cur_lyr_dec_minus_1;

    ps_cur_slice = ps_dec->ps_cur_slice;

    ps_svc_slice_params = &ps_svc_lyr_dec->s_svc_slice_params;

    /* read FirstMbInSlice  and slice type*/

    ps_dec->ps_dpb_cmds->u1_dpb_commands_read_slc = 0;

    u2_first_mb_in_slice = ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf);

    if(u2_first_mb_in_slice > (ps_dec->u2_frm_ht_in_mbs * ps_dec->u2_frm_wd_in_mbs))

    {

        return ERROR_CORRUPTED_SLICE;

    }

    /*we currently don not support ASO*/

    if(((u2_first_mb_in_slice << ps_cur_slice->u1_mbaff_frame_flag) <= ps_dec->u4_cur_mb_addr) &&

       (ps_dec->u4_first_slice_in_pic == 0))

    {

        return ERROR_CORRUPTED_SLICE;

    }

    if(ps_dec->u4_first_slice_in_pic == 1)

    {

        if(u2_first_mb_in_slice != 0)

        {

            return ERROR_CORRUPTED_SLICE;

        }

    }

    COPYTHECONTEXT("Slice Header SVC ext: first_mb_in_slice", u2_first_mb_in_slice);

    u4_temp = ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf);

    if(u4_temp > 9) return ERROR_INV_SLC_TYPE_T;

    u1_slice_type = u4_temp;

    COPYTHECONTEXT("Slice Header SVC ext: slice_type", (u1_slice_type));

    /* Find Out the Slice Type is 5 to 9 or not then Set the Flag   */

    /* u1_sl_typ_5_9 = 1 .Which tells that all the slices in the Pic*/

    /* will be of same type of current                            */

    if(u1_slice_type > 4)

    {

        u1_slice_type -= 5;

    }

    u4_temp = ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf);

    if(u4_temp & MASK_ERR_PIC_SET_ID) return ERROR_INV_SLICE_HDR_T;

    /* discard slice if pic param is invalid */

    COPYTHECONTEXT("Slice Header SVC ext: pic_parameter_set_id", u4_temp);

    ps_pps = &ps_dec->ps_pps[u4_temp];

    if(FALSE == ps_pps->u1_is_valid)

    {

        return ERROR_INV_SLICE_HDR_T;

    }

    /* slices in a layer should have same PPS id*/

    if(UINT32_MAX == ps_svc_lyr_dec->u4_pps_id_for_layer)

    {

        ps_svc_lyr_dec->u4_pps_id_for_layer = u4_temp;

    }

    else if(u4_temp != ps_svc_lyr_dec->u4_pps_id_for_layer)

    {

        return ERROR_INV_SLICE_HDR_T;

    }

    ps_seq = ps_pps->ps_sps;

    ps_seq += MAX_NUM_SEQ_PARAMS;

    ps_subset_seq =

        &ps_svc_lyr_dec->ps_subset_sps[MAX_NUM_SEQ_PARAMS + ps_seq->u1_seq_parameter_set_id];

    ps_dec->ps_cur_sps = ps_seq;

    ps_svc_lyr_dec->ps_cur_subset_sps = ps_subset_seq;

    if(!ps_seq) return ERROR_INV_SLICE_HDR_T;

    if(FALSE == ps_seq->u1_is_valid) return ERROR_INV_SLICE_HDR_T;

    if(ps_seq->u1_mb_aff_flag) return ERROR_INV_SLICE_HDR_T;

    if(ps_seq->u1_level_idc > H264_LEVEL_4_2) return ERROR_INV_SLICE_HDR_T;

    if(!ps_seq->u1_frame_mbs_only_flag) return ERROR_INV_SLICE_HDR_T;

    if(OK != isvcd_verify_level(ps_seq->u1_level_idc)) return ERROR_INV_SLICE_HDR_T;

    if(ps_dec->u1_init_dec_flag == 1)

    {

        if(ps_dec->u2_frm_wd_in_mbs != ps_seq->u2_frm_wd_in_mbs) return ERROR_INV_SLICE_HDR_T;

        if(ps_dec->u2_frm_ht_in_mbs != ps_seq->u2_frm_ht_in_mbs) return ERROR_INV_SLICE_HDR_T;

    }

    if(ps_dec->u1_init_dec_flag == 1)

    {

        if(ps_dec->u2_disp_height != ps_subset_seq->u2_disp_height) return ERROR_INV_SLICE_HDR_T;

        if(ps_dec->u2_disp_width != ps_subset_seq->u2_disp_width) return ERROR_INV_SLICE_HDR_T;

    }

    ps_dec->i4_reorder_depth = ps_subset_seq->i4_reorder_depth;

    ps_dec->u2_disp_height = ps_subset_seq->u2_disp_height;

    ps_dec->u2_disp_width = ps_subset_seq->u2_disp_width;

    if(ps_svc_lyr_dec->u1_layer_id > 0)

    {

        psvcd_dec_ctxt = ps_svc_lyr_dec->ps_svcd_ctxt;

        ps_svc_cur_lyr_dec_minus_1 =

            &psvcd_dec_ctxt->ps_svc_dec_lyr[ps_svc_lyr_dec->u1_layer_id - 1];

        ps_dec_cur_lyr_minus_1 = &ps_svc_cur_lyr_dec_minus_1->s_dec;

        if((ps_dec_cur_lyr_minus_1->u2_pic_wd > ps_subset_seq->u2_pic_wd) ||

           (ps_dec_cur_lyr_minus_1->u2_pic_ht > ps_subset_seq->u2_pic_ht))

        {

            return ERROR_CORRUPTED_SLICE;

        }

    }

    ps_dec->u2_pic_wd = ps_subset_seq->u2_pic_wd;

    ps_dec->u2_pic_ht = ps_subset_seq->u2_pic_ht;

    ps_dec->u4_total_mbs = ps_seq->u4_total_num_of_mbs << (1 - ps_seq->u1_frame_mbs_only_flag);

    /* Determining the Width and Height of Frame from that of Picture */

    ps_dec->u2_frm_wd_y = ps_subset_seq->u2_frm_wd_y;

    ps_dec->u2_frm_ht_y = ps_subset_seq->u2_frm_ht_y;

    ps_dec->u2_frm_wd_uv = ps_subset_seq->u2_frm_wd_uv;

    ps_dec->u2_frm_ht_uv = ps_subset_seq->u2_frm_ht_uv;

    ps_dec->s_pad_mgr.u1_pad_len_y_v = ps_subset_seq->u1_pad_len_y_v;

    ps_dec->s_pad_mgr.u1_pad_len_cr_v = ps_subset_seq->u1_pad_len_cr_v;

    ps_dec->u2_frm_wd_in_mbs = ps_seq->u2_frm_wd_in_mbs;

    ps_dec->u2_frm_ht_in_mbs = ps_seq->u2_frm_ht_in_mbs;

    ps_dec->u2_crop_offset_y = ps_subset_seq->u2_crop_offset_y;

    ps_dec->u2_crop_offset_uv = ps_subset_seq->u2_crop_offset_uv;

    /* Get the frame num */

    u2_frame_num = ih264d_get_bits_h264(ps_bitstrm, ps_seq->u1_bits_in_frm_num);

    COPYTHECONTEXT("Slice Header SVC ext: frame_num", u2_frame_num);

    if(!ps_dec->u1_first_slice_in_stream && ps_dec->u4_first_slice_in_pic)

    {

        pocstruct_t *ps_prev_poc = &ps_dec->s_prev_pic_poc;

        pocstruct_t *ps_cur_poc = &ps_dec->s_cur_pic_poc;

        ps_dec->u2_mbx = 0xffff;

        ps_dec->u2_mby = 0;

        if((0 == u1_is_idr_slice) && ps_cur_slice->u1_nal_ref_idc)

            ps_dec->u2_prev_ref_frame_num = ps_cur_slice->u2_frame_num;

        if(u1_is_idr_slice || ps_cur_slice->u1_mmco_equalto5) ps_dec->u2_prev_ref_frame_num = 0;

        if(ps_dec->ps_cur_sps->u1_gaps_in_frame_num_value_allowed_flag)

        {

            isvcd_decode_gaps_in_frame_num(ps_dec, u2_frame_num);

        }

        ps_prev_poc->i4_prev_frame_num_ofst = ps_cur_poc->i4_prev_frame_num_ofst;

        ps_prev_poc->u2_frame_num = ps_cur_poc->u2_frame_num;

        ps_prev_poc->u1_mmco_equalto5 = ps_cur_slice->u1_mmco_equalto5;

        if(ps_cur_slice->u1_nal_ref_idc)

        {

            ps_prev_poc->i4_pic_order_cnt_lsb = ps_cur_poc->i4_pic_order_cnt_lsb;

            ps_prev_poc->i4_pic_order_cnt_msb = ps_cur_poc->i4_pic_order_cnt_msb;

            ps_prev_poc->i4_delta_pic_order_cnt_bottom = ps_cur_poc->i4_delta_pic_order_cnt_bottom;

            ps_prev_poc->i4_delta_pic_order_cnt[0] = ps_cur_poc->i4_delta_pic_order_cnt[0];

            ps_prev_poc->i4_delta_pic_order_cnt[1] = ps_cur_poc->i4_delta_pic_order_cnt[1];

            ps_prev_poc->u1_bot_field = ps_cur_poc->u1_bot_field;

        }

        ps_dec->u4_total_mbs_coded = 0;

    }

    /* Get the field related flags  */

    if(!ps_seq->u1_frame_mbs_only_flag)

    {

        u1_field_pic_flag = ih264d_get_bit_h264(ps_bitstrm);

        COPYTHECONTEXT("Slice Header SVC ext: field_pic_flag", u1_field_pic_flag);

        u1_bottom_field_flag = 0;

        if(u1_field_pic_flag)

        {

            ps_dec->pu1_inv_scan = (UWORD8 *) gau1_ih264d_inv_scan_fld;

            u1_bottom_field_flag = ih264d_get_bit_h264(ps_bitstrm);

            COPYTHECONTEXT("Slice Header SVC ext: bottom_field_flag", u1_bottom_field_flag);

        }

        else

        {

            ps_dec->pu1_inv_scan = (UWORD8 *) gau1_ih264d_inv_scan;

        }

    }

    else

    {

        u1_field_pic_flag = 0;

        u1_bottom_field_flag = 0;

        ps_dec->pu1_inv_scan = (UWORD8 *) gau1_ih264d_inv_scan;

    }

    u1_nal_unit_type = SLICE_NAL;

    if(u1_is_idr_slice)

    {

        u1_nal_unit_type = IDR_SLICE_NAL;

        u4_idr_pic_id = ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf);

        if(u4_idr_pic_id > 65535) return ERROR_INV_SLICE_HDR_T;

        COPYTHECONTEXT("Slice Header SVC ext:  ", u4_idr_pic_id);

    }

    /* read delta pic order count information*/

    i_delta_poc[0] = i_delta_poc[1] = 0;

    s_tmp_poc.i4_pic_order_cnt_lsb = 0;

    s_tmp_poc.i4_delta_pic_order_cnt_bottom = 0;

    u1_pic_order_cnt_type = ps_seq->u1_pic_order_cnt_type;

    if(u1_pic_order_cnt_type == 0)

    {

        i_temp = ih264d_get_bits_h264(ps_bitstrm, ps_seq->u1_log2_max_pic_order_cnt_lsb_minus);

        if(i_temp < 0 || i_temp >= ps_seq->i4_max_pic_order_cntLsb) return ERROR_INV_SLICE_HDR_T;

        s_tmp_poc.i4_pic_order_cnt_lsb = i_temp;

        COPYTHECONTEXT("Slice Header SVC ext: pic_order_cnt_lsb", s_tmp_poc.i4_pic_order_cnt_lsb);

        if((ps_pps->u1_pic_order_present_flag == 1) && (!u1_field_pic_flag))

        {

            s_tmp_poc.i4_delta_pic_order_cnt_bottom = ih264d_sev(pu4_bitstrm_ofst, pu4_bitstrm_buf);

            COPYTHECONTEXT("Slice Header SVC ext: delta_pic_order_cnt_bottom",

                           s_tmp_poc.i4_delta_pic_order_cnt_bottom);

        }

    }

    s_tmp_poc.i4_delta_pic_order_cnt[0] = 0;

    s_tmp_poc.i4_delta_pic_order_cnt[1] = 0;

    if(u1_pic_order_cnt_type == 1 && (!ps_seq->u1_delta_pic_order_always_zero_flag))

    {

        s_tmp_poc.i4_delta_pic_order_cnt[0] = ih264d_sev(pu4_bitstrm_ofst, pu4_bitstrm_buf);

        COPYTHECONTEXT("Slice Header SVC ext: delta_pic_order_cnt[0]",

                       s_tmp_poc.i4_delta_pic_order_cnt[0]);

        if(ps_pps->u1_pic_order_present_flag && !u1_field_pic_flag)

        {

            s_tmp_poc.i4_delta_pic_order_cnt[1] = ih264d_sev(pu4_bitstrm_ofst, pu4_bitstrm_buf);

            COPYTHECONTEXT("Slice Header SVC ext: delta_pic_order_cnt[1]",

                           s_tmp_poc.i4_delta_pic_order_cnt[1]);

        }

    }

    if(ps_pps->u1_redundant_pic_cnt_present_flag)

    {

        u4_temp = ih264d_uev(pu4_bitstrm_ofst, pu4_bitstrm_buf);

        if(u4_temp > MAX_REDUNDANT_PIC_CNT) return ERROR_INV_SLICE_HDR_T;

        u1_redundant_pic_cnt = u4_temp;

        COPYTHECONTEXT("Slice Header SVC ext: redundant_pic_cnt", u1_redundant_pic_cnt);

    }

    /*--------------------------------------------------------------------*/

    /* Check if the slice is part of new picture                          */

    /*--------------------------------------------------------------------*/

    /* First slice of a picture is always considered as part of new picture */

    i1_is_end_of_poc = 1;

    ps_dec->ps_dec_err_status->u1_err_flag &= MASK_REJECT_CUR_PIC;

    if(ps_dec->u4_first_slice_in_pic == 0)

    {

        i1_is_end_of_poc =

            ih264d_is_end_of_pic(u2_frame_num, u1_nal_ref_idc, &s_tmp_poc, &ps_dec->s_cur_pic_poc,

                                 ps_cur_slice, u1_pic_order_cnt_type, u1_nal_unit_type,

                                 u4_idr_pic_id, u1_field_pic_flag, u1_bottom_field_flag);

        if(i1_is_end_of_poc)

        {

            ps_dec->u1_first_slice_in_stream = 0;

            return ERROR_INCOMPLETE_FRAME;

        }

    }

    /*--------------------------------------------------------------------*/

    /* Check for error in slice and parse the missing/corrupted MB's      */

    /* as skip-MB's in an inserted P-slice                                */

    /*--------------------------------------------------------------------*/

    u1_mbaff = ps_seq->u1_mb_aff_flag && (!u1_field_pic_flag);

    prev_slice_err = 0;

    if(i1_is_end_of_poc || ps_dec->u1_first_slice_in_stream)

    {

        /* If the current slice is not a field or frame number of the current

         * slice doesn't match with previous slice, and decoder is expecting

         * to decode a field i.e. ps_dec->u1_top_bottom_decoded is not 0 and

         * is not (TOP_FIELD_ONLY | BOT_FIELD_ONLY), treat it as a dangling

         * field */

        if((u1_field_pic_flag == 0 || u2_frame_num != ps_dec->u2_prv_frame_num) &&

           ps_dec->u1_top_bottom_decoded != 0 &&

           ps_dec->u1_top_bottom_decoded != (TOP_FIELD_ONLY | BOT_FIELD_ONLY))

        {

            ps_dec->u1_dangling_field = 1;

            if(ps_dec->u4_first_slice_in_pic)

            {

                // first slice - dangling field

                prev_slice_err = 1;

            }

            else

            {

                // last slice - dangling field

                prev_slice_err = 2;

            }

            if(ps_dec->u1_top_bottom_decoded == TOP_FIELD_ONLY)

                ps_cur_slice->u1_bottom_field_flag = 1;

            else

                ps_cur_slice->u1_bottom_field_flag = 0;

            num_mb_skipped =

                (ps_dec->u2_frm_ht_in_mbs * ps_dec->u2_frm_wd_in_mbs) - ps_dec->u4_total_mbs_coded;

            ps_cur_poc = &ps_dec->s_cur_pic_poc;

            u1_is_idr_slice = ps_cur_slice->u1_nal_unit_type == IDR_SLICE_NAL;

        }

        else if(ps_dec->u4_first_slice_in_pic)

        {

            if(u2_first_mb_in_slice > 0)

            {

                // first slice - missing/header corruption

                prev_slice_err = 1;

                num_mb_skipped = u2_first_mb_in_slice << u1_mbaff;

                ps_cur_poc = &s_tmp_poc;