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

*

* Copyright (C) 2012 Ittiam Systems Pvt Ltd, Bangalore

*

* 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.

*

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

/**

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

 * @file

 *  ihevc_boundary_strength.c

 *

 * @brief

 *  Contains functions for computing boundary strength

 *

 * @author

 *  Harish

 *

 * @par List of Functions:

 *

 * @remarks

 *  None

 *

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

 */

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

/* File Includes                                                             */

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

#include <stdio.h>

#include <stddef.h>

#include <stdlib.h>

#include <string.h>

#include "ihevc_typedefs.h"

#include "iv.h"

#include "ivd.h"

#include "ihevcd_cxa.h"

#include "ithread.h"

#include "ihevc_defs.h"

#include "ihevc_debug.h"

#include "ihevc_defs.h"

#include "ihevc_structs.h"

#include "ihevc_macros.h"

#include "ihevc_platform_macros.h"

#include "ihevc_cabac_tables.h"

#include "ihevc_error.h"

#include "ihevc_common_tables.h"

#include "ihevcd_trace.h"

#include "ihevcd_defs.h"

#include "ihevcd_function_selector.h"

#include "ihevcd_structs.h"

#include "ihevcd_error.h"

#include "ihevcd_nal.h"

#include "ihevcd_bitstream.h"

#include "ihevcd_job_queue.h"

#include "ihevcd_utils.h"

#include "ihevcd_profile.h"

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

/* Function Prototypes                                                       */

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

#define SET_NGBHR_ALL_AVAIL(avail)          avail = 0x1F;

#define SET_NGBHR_BOTLEFT_NOTAVAIL(avail)   avail &= ~0x10;

#define SET_NGBHR_LEFT_NOTAVAIL(avail)      avail &= ~0x8;

#define SET_NGBHR_TOPLEFT_NOTAVAIL(avail)   avail &= ~0x4;

#define SET_NGBHR_TOP_NOTAVAIL(avail)       avail &= ~0x2;

#define SET_NGBHR_TOPRIGHT_NOTAVAIL(avail)  avail &= ~0x1;

WORD32 ihevcd_pu_boundary_strength(pu_t *ps_pu,

                                   pu_t *ps_ngbr_pu)

{

    WORD32 i4_bs;

    UWORD32 l0_ref_pic_buf_id, l1_ref_pic_buf_id;

    UWORD32 ngbr_l0_ref_pic_buf_id, ngbr_l1_ref_pic_buf_id;

    WORD16 i2_mv_x0, i2_mv_y0, i2_mv_x1, i2_mv_y1;

    WORD16 i2_ngbr_mv_x0, i2_ngbr_mv_y0, i2_ngbr_mv_x1, i2_ngbr_mv_y1;

    WORD32 num_mv, ngbr_num_mv;

    num_mv = (PRED_BI == ps_pu->b2_pred_mode) ? 2 : 1;

    ngbr_num_mv = (PRED_BI == ps_ngbr_pu->b2_pred_mode) ? 2 : 1;

    l0_ref_pic_buf_id = ps_pu->mv.i1_l0_ref_pic_buf_id;

    l1_ref_pic_buf_id = ps_pu->mv.i1_l1_ref_pic_buf_id;

    ngbr_l0_ref_pic_buf_id = ps_ngbr_pu->mv.i1_l0_ref_pic_buf_id;

    ngbr_l1_ref_pic_buf_id = ps_ngbr_pu->mv.i1_l1_ref_pic_buf_id;

    i2_mv_x0 = ps_pu->mv.s_l0_mv.i2_mvx;

    i2_mv_y0 = ps_pu->mv.s_l0_mv.i2_mvy;

    i2_mv_x1 = ps_pu->mv.s_l1_mv.i2_mvx;

    i2_mv_y1 = ps_pu->mv.s_l1_mv.i2_mvy;

    i2_ngbr_mv_x0 = ps_ngbr_pu->mv.s_l0_mv.i2_mvx;

    i2_ngbr_mv_y0 = ps_ngbr_pu->mv.s_l0_mv.i2_mvy;

    i2_ngbr_mv_x1 = ps_ngbr_pu->mv.s_l1_mv.i2_mvx;

    i2_ngbr_mv_y1 = ps_ngbr_pu->mv.s_l1_mv.i2_mvy;

    /* If two motion vectors are used */

    if((2 == num_mv) &&

            (2 == ngbr_num_mv))

    {

        if((l0_ref_pic_buf_id == ngbr_l0_ref_pic_buf_id && l1_ref_pic_buf_id == ngbr_l1_ref_pic_buf_id) ||

                (l0_ref_pic_buf_id == ngbr_l1_ref_pic_buf_id && l1_ref_pic_buf_id == ngbr_l0_ref_pic_buf_id))

        {

            if(l0_ref_pic_buf_id != l1_ref_pic_buf_id) /* Different L0 and L1 */

            {

                if(l0_ref_pic_buf_id == ngbr_l0_ref_pic_buf_id)

                {

                    i4_bs = (ABS(i2_mv_x0 - i2_ngbr_mv_x0) < 4) &&

                            (ABS(i2_mv_y0 - i2_ngbr_mv_y0) < 4) &&

                            (ABS(i2_mv_x1 - i2_ngbr_mv_x1) < 4) &&

                            (ABS(i2_mv_y1 - i2_ngbr_mv_y1) < 4) ? 0 : 1;

                }

                else

                {

                    i4_bs = (ABS(i2_mv_x0 - i2_ngbr_mv_x1) < 4) &&

                            (ABS(i2_mv_y0 - i2_ngbr_mv_y1) < 4) &&

                            (ABS(i2_mv_x1 - i2_ngbr_mv_x0) < 4) &&

                            (ABS(i2_mv_y1 - i2_ngbr_mv_y0) < 4) ? 0 : 1;

                }

            }

            else /* Same L0 and L1 */

            {

                i4_bs = ((ABS(i2_mv_x0 - i2_ngbr_mv_x0) >= 4) ||

                         (ABS(i2_mv_y0 - i2_ngbr_mv_y0) >= 4) ||

                         (ABS(i2_mv_x1 - i2_ngbr_mv_x1) >= 4) ||

                         (ABS(i2_mv_y1 - i2_ngbr_mv_y1) >= 4)) &&

                                ((ABS(i2_mv_x0 - i2_ngbr_mv_x1) >= 4) ||

                                 (ABS(i2_mv_y0 - i2_ngbr_mv_y1) >= 4) ||

                                 (ABS(i2_mv_x1 - i2_ngbr_mv_x0) >= 4) ||

                                 (ABS(i2_mv_y1 - i2_ngbr_mv_y0) >= 4)) ? 1 : 0;

            }

        }

        else /* If the reference pictures used are different */

        {

            i4_bs = 1;

        }

    }

    /* If one motion vector is used in both PUs */

    else if((1 == num_mv) &&

            (1 == ngbr_num_mv))

    {

        WORD16 i2_mv_x, i2_mv_y;

        WORD16 i2_ngbr_mv_x, i2_ngbr_mv_y;

        UWORD32 ref_pic_buf_id, ngbr_ref_pic_buf_id;

        if(PRED_L0 == ps_pu->b2_pred_mode)

        {

            i2_mv_x = i2_mv_x0;

            i2_mv_y = i2_mv_y0;

            ref_pic_buf_id = l0_ref_pic_buf_id;

        }

        else

        {

            i2_mv_x = i2_mv_x1;

            i2_mv_y = i2_mv_y1;

            ref_pic_buf_id = l1_ref_pic_buf_id;

        }

        if(PRED_L0 == ps_ngbr_pu->b2_pred_mode)

        {

            i2_ngbr_mv_x = i2_ngbr_mv_x0;

            i2_ngbr_mv_y = i2_ngbr_mv_y0;

            ngbr_ref_pic_buf_id = ngbr_l0_ref_pic_buf_id;

        }

        else

        {

            i2_ngbr_mv_x = i2_ngbr_mv_x1;

            i2_ngbr_mv_y = i2_ngbr_mv_y1;

            ngbr_ref_pic_buf_id = ngbr_l1_ref_pic_buf_id;

        }

        i4_bs = (ref_pic_buf_id == ngbr_ref_pic_buf_id) &&

                (ABS(i2_mv_x - i2_ngbr_mv_x) < 4)  &&

                (ABS(i2_mv_y - i2_ngbr_mv_y) < 4) ? 0 : 1;

    }

    /* If the no. of motion vectors is not the same */

    else

    {

        i4_bs = 1;

    }

    return i4_bs;

}

/* QP is also populated in the same function */

WORD32 ihevcd_ctb_boundary_strength_islice(bs_ctxt_t *ps_bs_ctxt)

{

    pps_t *ps_pps;

    sps_t *ps_sps;

    tu_t *ps_tu;

    UWORD32 *pu4_vert_bs;

    UWORD32 *pu4_horz_bs;

    WORD32 bs_strd;

    WORD32 vert_bs0_tmp;

    WORD32 horz_bs0_tmp;

    UWORD8 *pu1_qp;

    WORD32 qp_strd;

    UWORD32 u4_qp_const_in_ctb;

    WORD32 ctb_indx;

    WORD32 i4_tu_cnt;

    WORD32 log2_ctb_size;

    WORD32 ctb_size;

    WORD8 i1_loop_filter_across_tiles_enabled_flag;

    WORD8 i1_loop_filter_across_slices_enabled_flag;

    WORD32 i;

    PROFILE_DISABLE_BOUNDARY_STRENGTH();

    ps_pps = ps_bs_ctxt->ps_pps;

    ps_sps = ps_bs_ctxt->ps_sps;

    i1_loop_filter_across_tiles_enabled_flag = ps_pps->i1_loop_filter_across_tiles_enabled_flag;

    i1_loop_filter_across_slices_enabled_flag = ps_bs_ctxt->ps_slice_hdr->i1_slice_loop_filter_across_slices_enabled_flag;

    i4_tu_cnt = ps_bs_ctxt->i4_ctb_tu_cnt;

    log2_ctb_size = ps_sps->i1_log2_ctb_size;

    ctb_size = (1 << log2_ctb_size);

    /* strides are in units of number of bytes */

    /* ctb_size * ctb_size / 8 / 16 is the number of bytes needed per CTB */

    bs_strd = (ps_sps->i2_pic_wd_in_ctb + 1) << (2 * log2_ctb_size - 7);

    pu4_vert_bs = (UWORD32 *)((UWORD8 *)ps_bs_ctxt->pu4_pic_vert_bs +

                    (ps_bs_ctxt->i4_ctb_x << (2 * log2_ctb_size - 7)) +

                    ps_bs_ctxt->i4_ctb_y * bs_strd);

    pu4_horz_bs = (UWORD32 *)((UWORD8 *)ps_bs_ctxt->pu4_pic_horz_bs +

                    (ps_bs_ctxt->i4_ctb_x << (2 * log2_ctb_size - 7)) +

                    ps_bs_ctxt->i4_ctb_y * bs_strd);

    /* ctb_size/8 elements per CTB */

    qp_strd = ps_sps->i2_pic_wd_in_ctb << (log2_ctb_size - 3);

    pu1_qp = ps_bs_ctxt->pu1_pic_qp + ((ps_bs_ctxt->i4_ctb_x + ps_bs_ctxt->i4_ctb_y * qp_strd) << (log2_ctb_size - 3));

    ctb_indx = ps_bs_ctxt->i4_ctb_x + ps_sps->i2_pic_wd_in_ctb * ps_bs_ctxt->i4_ctb_y;

    u4_qp_const_in_ctb = ps_bs_ctxt->pu1_pic_qp_const_in_ctb[ctb_indx >> 3] & (1 << (ctb_indx & 7));

    vert_bs0_tmp = pu4_vert_bs[0] & (0xFFFFFFFF >> (sizeof(UWORD32) * 8 - ctb_size / 2));

    horz_bs0_tmp = pu4_horz_bs[0] & (0xFFFFFFFF >> (sizeof(UWORD32) * 8 - ctb_size / 2));

    /* ctb_size/8 is the number of edges per CTB

     * ctb_size/4 is the number of BS values needed per edge

     * divided by 8 for the number of bytes

     * 2 is the number of bits needed for each BS value */

/*

    memset(pu4_vert_bs, 0, (ctb_size / 8 + 1) * (ctb_size / 4) / 8 * 2 );

    memset(pu4_horz_bs, 0, (ctb_size / 8) * (ctb_size / 4) / 8 * 2 );

*/

    memset(pu4_vert_bs, 0, (1 << (2 * log2_ctb_size - 7)) + ((ctb_size >> 5) << 1));

    memset(pu4_horz_bs, 0, (1 << (2 * log2_ctb_size - 7)));

    /* pu4_vert_bs[0] has information about the left CTB which is not required when ctb_x = 0 */

    if(0 != ps_bs_ctxt->i4_ctb_x)

    {

        pu4_vert_bs[0] |= vert_bs0_tmp;

    }

    /* pu4_horz_bs[0] has information about the top CTB which is not required when ctb_y = 0 */

    if(0 != ps_bs_ctxt->i4_ctb_y)

    {

        pu4_horz_bs[0] |= horz_bs0_tmp;

    }

    ps_tu = ps_bs_ctxt->ps_tu;

    /* Populating the QP array - if const_qp_in_ctb flag is one, set only the first element */

    if(u4_qp_const_in_ctb)

        pu1_qp[0] = ps_tu->b7_qp;

    for(i = 0; i < i4_tu_cnt; i++)

    {

        WORD32 start_pos_x;

        WORD32 start_pos_y;

        WORD32 tu_size;

        UWORD32 u4_bs;

        ps_tu = ps_bs_ctxt->ps_tu + i;

        /* start_pos_x and start_pos_y are in units of min TU size (4x4) */

        start_pos_x = ps_tu->b4_pos_x;

        start_pos_y = ps_tu->b4_pos_y;

        tu_size = 1 << (ps_tu->b3_size + 2);

        tu_size >>= 2; /* TU size divided by 4 */

        u4_bs = DUP_LSB_10(tu_size);

        /* Only if the current edge falls on 8 pixel grid set BS */

        if(0 == (start_pos_x & 1))

        {

            WORD32 shift;

            shift = start_pos_y * 2;

            /* shift += (((start_pos_x >> 1) & (MAX_CTB_SIZE / ctb_size - 1)) << (log2_ctb_size - 1));

             *  will reduce to the following assuming ctb size is one of 16, 32 and 64

             *  and deblocking is done on 8x8 grid

             */

            if(6 != log2_ctb_size)

                shift += ((start_pos_x & 2) << (log2_ctb_size - 2));

            pu4_vert_bs[start_pos_x >> (7 - log2_ctb_size)] |= (u4_bs << shift);

        }

        /* Only if the current edge falls on 8 pixel grid set BS */

        if(0 == (start_pos_y & 1))

        {

            WORD32 shift;

            shift = start_pos_x * 2;

            /* shift += (((start_pos_y >> 1) & (MAX_CTB_SIZE / ctb_size - 1)) << (log2_ctb_size - 1));

             *  will reduce to the following assuming ctb size is one of 16, 32 and 64

             *  and deblocking is done on 8x8 grid

             */

            if(6 != log2_ctb_size)

                shift += ((start_pos_y & 2) << (log2_ctb_size - 2));

            pu4_horz_bs[start_pos_y >> (7 - log2_ctb_size)] |= (u4_bs << shift);

        }

        /* Populating the QP array */

        if(0 == u4_qp_const_in_ctb)

        {

            if(0 == (start_pos_x & 1) && 0 == (start_pos_y & 1))

            {

                WORD32 row, col;

                for(row = start_pos_y; row < start_pos_y + tu_size; row += 2)

                {

                    for(col = start_pos_x; col < start_pos_x + tu_size; col += 2)

                    {

                        pu1_qp[(row >> 1) * qp_strd + (col >> 1)] = ps_tu->b7_qp;

                    }

                }

            }

        }

    }

    {

        /*Determine if the slice is dependent, and is its left neighbor belongs to the same slice, in a different tile*/

        UWORD32 ctb_addr;

        WORD32 slice_idx, left_slice_idx = -1, top_slice_idx = -1;

        /* If left neighbor is not available, then set BS for entire first column to zero */

        if(!ps_pps->i1_tiles_enabled_flag)

        {

            if((0 == i1_loop_filter_across_tiles_enabled_flag && 0 == ps_bs_ctxt->i4_ctb_tile_x) ||

                            (0 == i1_loop_filter_across_slices_enabled_flag && 0 == ps_bs_ctxt->i4_ctb_slice_x && 0 == ps_bs_ctxt->i4_ctb_slice_y) ||

                            (0 == ps_bs_ctxt->i4_ctb_x))

            {

                pu4_vert_bs[0] &= (64 == ctb_size) ? 0 : ((UWORD32)0xFFFFFFFF) << (ctb_size / 2);

            }

        }

        else

        {

            //If across-tiles is disabled

            if((0 == i1_loop_filter_across_tiles_enabled_flag && 0 == ps_bs_ctxt->i4_ctb_tile_x))

            {

                pu4_vert_bs[0] &= (64 == ctb_size) ? 0 : ((UWORD32)0xFFFFFFFF) << (ctb_size / 2);

            }

            else

            {

                ctb_addr = ps_bs_ctxt->i4_ctb_x + (ps_bs_ctxt->i4_ctb_y * ps_sps->i2_pic_wd_in_ctb);

                slice_idx = ps_bs_ctxt->pu1_slice_idx[ctb_addr];

                if(ps_bs_ctxt->i4_ctb_x)

                {

                    ctb_addr = (ps_bs_ctxt->i4_ctb_x - 1) + (ps_bs_ctxt->i4_ctb_y * ps_sps->i2_pic_wd_in_ctb);

                    left_slice_idx = ps_bs_ctxt->pu1_slice_idx[ctb_addr];

                }

                /*If the 1st slice in a new tile is a dependent slice*/

                if(!((ps_bs_ctxt->ps_slice_hdr->i1_dependent_slice_flag == 1) && (slice_idx == left_slice_idx)))

                {

                    /* Removed reduntant checks */

                    if((0 == i1_loop_filter_across_slices_enabled_flag && (

                                    ((slice_idx != left_slice_idx) && 0 == ps_bs_ctxt->i4_ctb_slice_y) ||

                                    ((0 == ps_bs_ctxt->i4_ctb_tile_x) && (slice_idx != left_slice_idx)))) ||

                                    (0 == ps_bs_ctxt->i4_ctb_x))

                    {

                        pu4_vert_bs[0] &= (64 == ctb_size) ? 0 : ((UWORD32)0xFFFFFFFF) << (ctb_size / 2);

                    }

                }

            }

        }

        ctb_addr = ps_bs_ctxt->i4_ctb_x + (ps_bs_ctxt->i4_ctb_y * ps_sps->i2_pic_wd_in_ctb);

        slice_idx = ps_bs_ctxt->pu1_slice_idx[ctb_addr];

        if(ps_bs_ctxt->i4_ctb_y)

        {

            ctb_addr = (ps_bs_ctxt->i4_ctb_x) + ((ps_bs_ctxt->i4_ctb_y - 1) * ps_sps->i2_pic_wd_in_ctb);

            top_slice_idx = ps_bs_ctxt->pu1_slice_idx[ctb_addr];

        }

        /* If top neighbor is not available, then set BS for entire first row to zero */

        /* Removed reduntant checks */

        if((0 == i1_loop_filter_across_tiles_enabled_flag && 0 == ps_bs_ctxt->i4_ctb_tile_y)

                        || (0 == i1_loop_filter_across_slices_enabled_flag && ((slice_idx != top_slice_idx)))

                        || (0 == ps_bs_ctxt->i4_ctb_y))

        {

            pu4_horz_bs[0] &= (64 == ctb_size) ? 0 : ((UWORD32)0xFFFFFFFF) << (ctb_size / 2);

        }

    }

    /**

     *  Set BS of bottom and right frame boundaries to zero if it is an incomplete CTB

     *   (They might have been set to  non zero values because of CBF of the current CTB)

     *   This block might not be needed for I slices*/

    {

        WORD32 num_rows_remaining = (ps_sps->i2_pic_height_in_luma_samples - (ps_bs_ctxt->i4_ctb_y << log2_ctb_size)) >> 3;

        WORD32 num_cols_remaining = (ps_sps->i2_pic_width_in_luma_samples - (ps_bs_ctxt->i4_ctb_x << log2_ctb_size)) >> 3;

        if(num_rows_remaining < (ctb_size >> 3))

        {

            /* WORD32 offset = (((num_rows_remaining >> 3) & (MAX_CTB_SIZE / ctb_size - 1)) << (log2_ctb_size - 4));

             *  will reduce to the following assuming ctb size is one of 16, 32 and 64

             *  and deblocking is done on 8x8 grid

             */

            WORD32 offset;

            offset = (num_rows_remaining >> (6 - log2_ctb_size)) << 2;

            if(6 != log2_ctb_size)

                offset += (num_rows_remaining & 1) << (log2_ctb_size - 4);

            memset(((UWORD8 *)pu4_horz_bs) + offset, 0, 1 << (log2_ctb_size - 4));

        }

        if(num_cols_remaining < (ctb_size >> 3))

        {

            /* WORD32 offset = (((num_cols_remaining >> 3) & (MAX_CTB_SIZE / ctb_size - 1)) << (log2_ctb_size - 4));

             *  will reduce to the following assuming ctb size is one of 16, 32 and 64

             *  and deblocking is done on 8x8 grid

             */

            WORD32 offset;

            offset = (num_cols_remaining >> (6 - log2_ctb_size)) << 2;

            if(6 != log2_ctb_size)

                offset += (num_cols_remaining & 1) << (log2_ctb_size - 4);

            memset(((UWORD8 *)pu4_vert_bs) + offset, 0, 1 << (log2_ctb_size - 4));

        }

    }

    return 0;

}

WORD32 ihevcd_ctb_boundary_strength_pbslice(bs_ctxt_t *ps_bs_ctxt)

{

    sps_t *ps_sps;

    pps_t *ps_pps;

    WORD32 cur_ctb_idx, next_ctb_idx = 0;

    WORD32 i4_tu_cnt;

    WORD32 i4_pu_cnt;

    tu_t *ps_tu;

    UWORD32 *pu4_vert_bs;

    UWORD32 *pu4_horz_bs;

    WORD32 bs_strd;

    WORD32 vert_bs0_tmp;

    WORD32 horz_bs0_tmp;

    UWORD8 *pu1_qp;

    WORD32 qp_strd;

    UWORD32 u4_qp_const_in_ctb;

    WORD32 ctb_indx;

    WORD32 log2_ctb_size;

    WORD32 ctb_size;

    WORD32 i;

    WORD8 i1_loop_filter_across_tiles_enabled_flag;

    WORD8 i1_loop_filter_across_slices_enabled_flag;

    PROFILE_DISABLE_BOUNDARY_STRENGTH();

    ps_sps = ps_bs_ctxt->ps_sps;

    ps_pps = ps_bs_ctxt->ps_pps;

    log2_ctb_size = ps_sps->i1_log2_ctb_size;

    ctb_size = (1 << log2_ctb_size);

    /* strides are in units of number of bytes */

    /* ctb_size * ctb_size / 8 / 16 is the number of bytes needed per CTB */

    bs_strd = (ps_sps->i2_pic_wd_in_ctb + 1) << (2 * log2_ctb_size - 7);

    pu4_vert_bs = (UWORD32 *)((UWORD8 *)ps_bs_ctxt->pu4_pic_vert_bs +

                    (ps_bs_ctxt->i4_ctb_x << (2 * log2_ctb_size - 7)) +

                    ps_bs_ctxt->i4_ctb_y * bs_strd);

    pu4_horz_bs = (UWORD32 *)((UWORD8 *)ps_bs_ctxt->pu4_pic_horz_bs +

                    (ps_bs_ctxt->i4_ctb_x << (2 * log2_ctb_size - 7)) +

                    ps_bs_ctxt->i4_ctb_y * bs_strd);

    vert_bs0_tmp = pu4_vert_bs[0] & (0xFFFFFFFF >> (sizeof(UWORD32) * 8 - ctb_size / 2));

    horz_bs0_tmp = pu4_horz_bs[0] & (0xFFFFFFFF >> (sizeof(UWORD32) * 8 - ctb_size / 2));

    ps_tu = ps_bs_ctxt->ps_tu;

    /* ctb_size/8 elements per CTB */

    qp_strd = ps_sps->i2_pic_wd_in_ctb << (log2_ctb_size - 3);

    pu1_qp = ps_bs_ctxt->pu1_pic_qp + ((ps_bs_ctxt->i4_ctb_x + ps_bs_ctxt->i4_ctb_y * qp_strd) << (log2_ctb_size - 3));

    ctb_indx = ps_bs_ctxt->i4_ctb_x + ps_sps->i2_pic_wd_in_ctb * ps_bs_ctxt->i4_ctb_y;

    u4_qp_const_in_ctb = ps_bs_ctxt->pu1_pic_qp_const_in_ctb[ctb_indx >> 3] & (1 << (ctb_indx & 7));

    i1_loop_filter_across_tiles_enabled_flag = ps_pps->i1_loop_filter_across_tiles_enabled_flag;

    i1_loop_filter_across_slices_enabled_flag = ps_bs_ctxt->ps_slice_hdr->i1_slice_loop_filter_across_slices_enabled_flag;

    /* ctb_size/8 is the number of edges per CTB

     * ctb_size/4 is the number of BS values needed per edge

     * divided by 8 for the number of bytes

     * 2 is the number of bits needed for each BS value */

/*

    memset(pu4_vert_bs, 0, (ctb_size / 8 + 1) * (ctb_size / 4) * 2 / 8 );

    memset(pu4_horz_bs, 0, (ctb_size / 8) * (ctb_size / 4) * 2 / 8 );

*/

    memset(pu4_vert_bs, 0, (1 << (2 * log2_ctb_size - 7)) + (ctb_size >> 4));

    memset(pu4_horz_bs, 0, (1 << (2 * log2_ctb_size - 7)));

    /* pu4_vert_bs[0] has information about the left CTB which is not required when ctb_x = 0 */

    if(0 != ps_bs_ctxt->i4_ctb_x)

    {

        pu4_vert_bs[0] |= vert_bs0_tmp;

    }

    /* pu4_horz_bs[0] has information about the top CTB which is not required when ctb_y = 0 */

    if(0 != ps_bs_ctxt->i4_ctb_y)

    {

        pu4_horz_bs[0] |= horz_bs0_tmp;

    }

    /* pu4_horz_bs[bs_strd / 4] corresponds to pu4_horz_bs[0] of the bottom CTB */

    *(UWORD32 *)((UWORD8 *)pu4_horz_bs + bs_strd) = 0;

    cur_ctb_idx = ps_bs_ctxt->i4_ctb_x

                    + ps_bs_ctxt->i4_ctb_y * (ps_sps->i2_pic_wd_in_ctb);

    next_ctb_idx = ps_bs_ctxt->i4_next_tu_ctb_cnt;

    if(1 == ps_bs_ctxt->ps_codec->i4_num_cores)

    {

        i4_tu_cnt = ps_bs_ctxt->pu4_pic_tu_idx[next_ctb_idx] - ps_bs_ctxt->pu4_pic_tu_idx[cur_ctb_idx % RESET_TU_BUF_NCTB];

    }

    else

    {

        i4_tu_cnt = ps_bs_ctxt->pu4_pic_tu_idx[next_ctb_idx] - ps_bs_ctxt->pu4_pic_tu_idx[cur_ctb_idx];

    }

    ps_tu = ps_bs_ctxt->ps_tu;

    if(u4_qp_const_in_ctb)

        pu1_qp[0] = ps_tu->b7_qp;

    /* For all TUs in the CTB For left and top edges, check if there are coded coefficients on either sides of the edge */

    for(i = 0; i < i4_tu_cnt; i++)

    {

        WORD32 start_pos_x;

        WORD32 start_pos_y;

        WORD32 end_pos_x;

        WORD32 end_pos_y;

        WORD32 tu_size;

        UWORD32 u4_bs;

        WORD32 intra_flag;

        UWORD8 *pu1_pic_intra_flag;

        ps_tu = ps_bs_ctxt->ps_tu + i;

        start_pos_x = ps_tu->b4_pos_x;

        start_pos_y = ps_tu->b4_pos_y;

        tu_size = 1 << (ps_tu->b3_size + 2);

        tu_size >>= 2;

        end_pos_x = start_pos_x + tu_size;

        end_pos_y = start_pos_y + tu_size;

        {

            WORD32 tu_abs_x = (ps_bs_ctxt->i4_ctb_x << log2_ctb_size) + (start_pos_x << 2);

            WORD32 tu_abs_y = (ps_bs_ctxt->i4_ctb_y << log2_ctb_size) + (start_pos_y << 2);

            WORD32 numbytes_row =  (ps_sps->i2_pic_width_in_luma_samples + 63) / 64;

            pu1_pic_intra_flag = ps_bs_ctxt->ps_codec->pu1_pic_intra_flag;

            pu1_pic_intra_flag += (tu_abs_y >> 3) * numbytes_row;

            pu1_pic_intra_flag += (tu_abs_x >> 6);

            intra_flag = *pu1_pic_intra_flag;

            intra_flag &= (1 << ((tu_abs_x >> 3) % 8));

        }

        if(intra_flag)

        {

            u4_bs = DUP_LSB_10(tu_size);

            /* Only if the current edge falls on 8 pixel grid set BS */

            if(0 == (start_pos_x & 1))

            {

                WORD32 shift;

                shift = start_pos_y * 2;

                /* shift += (((start_pos_x >> 1) & (MAX_CTB_SIZE / ctb_size - 1)) << (log2_ctb_size - 1));

                 *  will reduce to the following assuming ctb size is one of 16, 32 and 64

                 *  and deblocking is done on 8x8 grid

                 */

                if(6 != log2_ctb_size)

                    shift += ((start_pos_x & 2) << (log2_ctb_size - 2));

                pu4_vert_bs[start_pos_x >> (7 - log2_ctb_size)] |= (u4_bs << shift);

            }

            /* Only if the current edge falls on 8 pixel grid set BS */

            if(0 == (start_pos_y & 1))

            {

                WORD32 shift;

                shift = start_pos_x * 2;

                /* shift += (((start_pos_y >> 1) & (MAX_CTB_SIZE / ctb_size - 1)) << (log2_ctb_size - 1));

                 *  will reduce to the following assuming ctb size is one of 16, 32 and 64

                 *  and deblocking is done on 8x8 grid

                 */

                if(6 != log2_ctb_size)

                    shift += ((start_pos_y & 2) << (log2_ctb_size - 2));

                pu4_horz_bs[start_pos_y >> (7 - log2_ctb_size)] |= (u4_bs << shift);

            }

        }

        /* If the current TU is coded then set both top edge and left edge BS to 1 and go to next TU */

        if(ps_tu->b1_y_cbf)

        {

            u4_bs = DUP_LSB_01(tu_size);

            /* Only if the current edge falls on 8 pixel grid set BS */

            if(0 == (start_pos_x & 1))

            {

                WORD32 shift;

                shift = start_pos_y * 2;

                /* shift += (((start_pos_x >> 1) & (MAX_CTB_SIZE / ctb_size - 1)) << (log2_ctb_size - 1));

                 *  will reduce to the following assuming ctb size is one of 16, 32 and 64

                 *  and deblocking is done on 8x8 grid

                 */

                if(6 != log2_ctb_size)

                    shift += ((start_pos_x & 2) << (log2_ctb_size - 2));

                pu4_vert_bs[start_pos_x >> (7 - log2_ctb_size)] |= (u4_bs << shift);

            }

            /* Only if the current edge falls on 8 pixel grid set BS */

            if(0 == (start_pos_y & 1))

            {

                WORD32 shift;

                shift = start_pos_x * 2;

                /* shift += (((start_pos_y >> 1) & (MAX_CTB_SIZE / ctb_size - 1)) << (log2_ctb_size - 1));

                 *  will reduce to the following assuming ctb size is one of 16, 32 and 64

                 *  and deblocking is done on 8x8 grid

                 */

                if(6 != log2_ctb_size)

                    shift += ((start_pos_y & 2) << (log2_ctb_size - 2));

                pu4_horz_bs[start_pos_y >> (7 - log2_ctb_size)] |= (u4_bs << shift);

            }

            /* Only if the current edge falls on 8 pixel grid set BS */

            if(0 == (end_pos_x & 1))

            {

                if(!(ctb_size / 8 == (end_pos_x >> 1) && ps_bs_ctxt->i4_ctb_x == ps_sps->i2_pic_wd_in_ctb - 1))

                {

                    WORD32 shift;

                    shift = start_pos_y * 2;

                    shift += (((end_pos_x >> 1) & ((MAX_CTB_SIZE >> log2_ctb_size) - 1)) << (log2_ctb_size - 1));

                    pu4_vert_bs[end_pos_x >> (7 - log2_ctb_size)] |= (u4_bs << shift);

                }

            }

            /* Only if the current edge falls on 8 pixel grid set BS */

            if(0 == (end_pos_y & 1))

            {

                /* If end_pos_y corresponds to the bottom of the CTB, write to pu4_horz_bs[0] of the bottom CTB */

                if(ctb_size / 8 == (end_pos_y >> 1))

                {

                    *(UWORD32 *)((UWORD8 *)pu4_horz_bs + bs_strd) |= (u4_bs << (start_pos_x * 2));

                }

                else

                {

                    WORD32 shift;

                    shift = start_pos_x * 2;

                    shift += (((end_pos_y >> 1) & ((MAX_CTB_SIZE >> log2_ctb_size) - 1)) << (log2_ctb_size - 1));

                    pu4_horz_bs[end_pos_y >> (7 - log2_ctb_size)] |= (u4_bs << shift);

                }

            }

        }

        if(0 == u4_qp_const_in_ctb)

        {

            if(0 == (start_pos_x & 1) && 0 == (start_pos_y & 1))

            {

                WORD32 row, col;

                for(row = start_pos_y; row < start_pos_y + tu_size; row += 2)

                {

                    for(col = start_pos_x; col < start_pos_x + tu_size; col += 2)

                    {

                        pu1_qp[(row >> 1) * qp_strd + (col >> 1)] = ps_tu->b7_qp;

                    }

                }

            }

        }

    }

    /* For all PUs in the CTB,

    For left and top edges, compute BS */

    cur_ctb_idx = ps_bs_ctxt->i4_ctb_x

                    + ps_bs_ctxt->i4_ctb_y * (ps_sps->i2_pic_wd_in_ctb);

    {

        WORD32 next_ctb_idx;

        next_ctb_idx = ps_bs_ctxt->i4_next_pu_ctb_cnt;

        i4_pu_cnt = ps_bs_ctxt->pu4_pic_pu_idx[next_ctb_idx] - ps_bs_ctxt->pu4_pic_pu_idx[cur_ctb_idx];

    }

    for(i = 0; i < i4_pu_cnt; i++)

    {

        WORD32 start_pos_x;

        WORD32 start_pos_y;

        WORD32 end_pos_x;

        WORD32 end_pos_y;

        WORD32 pu_wd, pu_ht;

        UWORD32 u4_bs;

        pu_t *ps_pu = ps_bs_ctxt->ps_pu + i;

        pu_t *ps_ngbr_pu;

        UWORD32 u4_ngbr_pu_indx;

        start_pos_x = ps_pu->b4_pos_x;

        start_pos_y = ps_pu->b4_pos_y;

        pu_wd = (ps_pu->b4_wd + 1);

        pu_ht = (ps_pu->b4_ht + 1);

        end_pos_x = start_pos_x + pu_wd;

        end_pos_y = start_pos_y + pu_ht;

        /* If the current PU is intra, set Boundary strength as 2 for both top and left edge */

        /* Need not mask the BS to zero even if it was set to 1 already since BS 2 and 3 are assumed to be the same in leaf level functions */

        if(ps_pu->b1_intra_flag)

        {

            u4_bs = DUP_LSB_10(pu_ht);

            /* Only if the current edge falls on 8 pixel grid set BS */

            if(0 == (start_pos_x & 1))

            {

                WORD32 shift;

                shift = start_pos_y * 2;

                /* shift += (((start_pos_x >> 1) & (MAX_CTB_SIZE / ctb_size - 1)) << (log2_ctb_size - 1));

                 *  will reduce to the following assuming ctb size is one of 16, 32 and 64

                 *  and deblocking is done on 8x8 grid

                 */

                if(6 != log2_ctb_size)

                    shift += ((start_pos_x & 2) << (log2_ctb_size - 2));

                pu4_vert_bs[start_pos_x >> (7 - log2_ctb_size)] |= (u4_bs << shift);

            }

            u4_bs = DUP_LSB_10(pu_wd);

            /* Only if the current edge falls on 8 pixel grid set BS */

            if(0 == (start_pos_y & 1))

            {

                WORD32 shift;

                shift = start_pos_x * 2;

                /* shift += (((start_pos_y >> 1) & (MAX_CTB_SIZE / ctb_size - 1)) << (log2_ctb_size - 1));

                 *  will reduce to the following assuming ctb size is one of 16, 32 and 64

                 *  and deblocking is done on 8x8 grid

                 */

                if(6 != log2_ctb_size)

                    shift += ((start_pos_y & 2) << (log2_ctb_size - 2));

                pu4_horz_bs[start_pos_y >> (7 - log2_ctb_size)] |= (u4_bs << shift);

            }

        }

        else

        {

            /* Vertical edge */

            /* Process only if the edge is not a frame edge */

            if(0 != ps_bs_ctxt->i4_ctb_x + start_pos_x)

            {

                do

                {

                    WORD32 pu_ngbr_ht;

                    WORD32 min_pu_ht;

                    WORD32 ngbr_end_pos_y;

                    UWORD32 ngbr_pu_idx_strd;

                    ngbr_pu_idx_strd = MAX_CTB_SIZE / MIN_PU_SIZE + 2;

                    u4_ngbr_pu_indx = ps_bs_ctxt->pu4_pic_pu_idx_map[(start_pos_y + 1) * ngbr_pu_idx_strd + (start_pos_x)];

                    ps_ngbr_pu = ps_bs_ctxt->ps_pic_pu + u4_ngbr_pu_indx;

                    pu_ngbr_ht = ps_ngbr_pu->b4_ht + 1;

                    ngbr_end_pos_y = ps_ngbr_pu->b4_pos_y + pu_ngbr_ht;

                    min_pu_ht = MIN(ngbr_end_pos_y, end_pos_y) - start_pos_y;

                    if(ps_ngbr_pu->b1_intra_flag)

                    {

                        u4_bs = DUP_LSB_10(min_pu_ht);

                        /* Only if the current edge falls on 8 pixel grid set BS */

                        if(0 == (start_pos_x & 1))

                        {

                            WORD32 shift;

                            shift = start_pos_y * 2;

                            /* shift += (((start_pos_x >> 1) & (MAX_CTB_SIZE / ctb_size - 1)) << (log2_ctb_size - 1));

                             *  will reduce to the following assuming ctb size is one of 16, 32 and 64

                             *  and deblocking is done on 8x8 grid

                             */

                            if(6 != log2_ctb_size)

                                shift += ((start_pos_x & 2) << (log2_ctb_size - 2));

                            pu4_vert_bs[start_pos_x >> (7 - log2_ctb_size)] |= (u4_bs << shift);

                        }

                    }

                    else

                    {

                        u4_bs = ihevcd_pu_boundary_strength(ps_pu, ps_ngbr_pu);

                        if(u4_bs)

                        {

                            u4_bs = DUP_LSB_01(min_pu_ht);

                            if(0 == (start_pos_x & 1))

                            {

                                WORD32 shift;

                                shift = start_pos_y * 2;

                                /* shift += (((start_pos_x >> 1) & (MAX_CTB_SIZE / ctb_size - 1)) << (log2_ctb_size - 1));

                                 *  will reduce to the following assuming ctb size is one of 16, 32 and 64

                                 *  and deblocking is done on 8x8 grid

                                 */

                                if(6 != log2_ctb_size)

                                    shift += ((start_pos_x & 2) << (log2_ctb_size - 2));

                                pu4_vert_bs[start_pos_x >> (7 - log2_ctb_size)] |= (u4_bs << shift);

                            }

                        }

                    }

                    pu_ht -= min_pu_ht;

                    start_pos_y += min_pu_ht;

                }while(pu_ht > 0);

                /* Reinitialising since the values are updated in the previous loop */

                pu_ht = ps_pu->b4_ht + 1;

                start_pos_y = ps_pu->b4_pos_y;

            }

            /* Horizontal edge */

            /* Process only if the edge is not a frame edge */

            if(0 != ps_bs_ctxt->i4_ctb_y + start_pos_y)

            {

                do

                {

                    WORD32 pu_ngbr_wd;

                    WORD32 min_pu_wd;

                    WORD32 ngbr_end_pos_x;

                    UWORD32 ngbr_pu_idx_strd = MAX_CTB_SIZE / MIN_PU_SIZE + 2;

                    u4_ngbr_pu_indx = ps_bs_ctxt->pu4_pic_pu_idx_map[(start_pos_y)*ngbr_pu_idx_strd + (start_pos_x + 1)];

                    ps_ngbr_pu = ps_bs_ctxt->ps_pic_pu + u4_ngbr_pu_indx;

                    pu_ngbr_wd = ps_ngbr_pu->b4_wd + 1;

                    ngbr_end_pos_x = ps_ngbr_pu->b4_pos_x + pu_ngbr_wd;

                    min_pu_wd = MIN(ngbr_end_pos_x, end_pos_x) - start_pos_x;

                    if(ps_ngbr_pu->b1_intra_flag)

                    {

                        u4_bs = DUP_LSB_10(min_pu_wd);

                        /* Only if the current edge falls on 8 pixel grid set BS */

                        if(0 == (start_pos_y & 1))

                        {

                            WORD32 shift;

                            shift = start_pos_x * 2;

                            /* shift += (((start_pos_y >> 1) & (MAX_CTB_SIZE / ctb_size - 1)) << (log2_ctb_size - 1));

                             *  will reduce to the following assuming ctb size is one of 16, 32 and 64

                             *  and deblocking is done on 8x8 grid

                             */

                            if(6 != log2_ctb_size)

                                shift += ((start_pos_y & 2) << (log2_ctb_size - 2));

                            pu4_horz_bs[start_pos_y >> (7 - log2_ctb_size)] |= (u4_bs << shift);

                        }

                    }

                    else

                    {

                        u4_bs = ihevcd_pu_boundary_strength(ps_pu, ps_ngbr_pu);

                        if(u4_bs)

                        {

                            u4_bs = DUP_LSB_01(min_pu_wd);

                            /* Only if the current edge falls on 8 pixel grid set BS */

                            if(0 == (start_pos_y & 1))

                            {

                                WORD32 shift;

                                shift = start_pos_x * 2;

                                /* shift += (((start_pos_y >> 1) & (MAX_CTB_SIZE / ctb_size - 1)) << (log2_ctb_size - 1));

                                 *  will reduce to the following assuming ctb size is one of 16, 32 and 64

                                 *  and deblocking is done on 8x8 grid

                                 */

                                if(6 != log2_ctb_size)

                                    shift += ((start_pos_y & 2) << (log2_ctb_size - 2));

                                pu4_horz_bs[start_pos_y >> (7 - log2_ctb_size)] |= (u4_bs << shift);

                            }

                        }

                    }

                    pu_wd -= min_pu_wd;

                    start_pos_x += min_pu_wd;

                }while(pu_wd > 0);

                /* Reinitialising since the values are updated in the previous loop */

                pu_wd = ps_pu->b4_wd + 1;

                start_pos_x = ps_pu->b4_pos_x;

            }

        }

    }

    {

        /* If left neighbor is not available, then set BS for entire first column to zero */

        UWORD32 ctb_addr;

        WORD32 slice_idx, left_slice_idx = -1, top_slice_idx = -1;

        if(!ps_pps->i1_tiles_enabled_flag)

        {

            if((0 == i1_loop_filter_across_tiles_enabled_flag && 0 == ps_bs_ctxt->i4_ctb_tile_x) ||

                            (0 == i1_loop_filter_across_slices_enabled_flag && 0 == ps_bs_ctxt->i4_ctb_slice_x && 0 == ps_bs_ctxt->i4_ctb_slice_y) ||

                            (0 == ps_bs_ctxt->i4_ctb_x))

            {

                pu4_vert_bs[0] &= (64 == ctb_size) ? 0 : ((UWORD32)0xFFFFFFFF) << (ctb_size / 2);

            }

        }

        else

        {

            if((0 == i1_loop_filter_across_tiles_enabled_flag && 0 == ps_bs_ctxt->i4_ctb_tile_x))

            {

                pu4_vert_bs[0] &= (64 == ctb_size) ? 0 : ((UWORD32)0xFFFFFFFF) << (ctb_size / 2);

            }

            else

            {

                ctb_addr = ps_bs_ctxt->i4_ctb_x + (ps_bs_ctxt->i4_ctb_y * ps_sps->i2_pic_wd_in_ctb);

                slice_idx = ps_bs_ctxt->pu1_slice_idx[ctb_addr];

                if(ps_bs_ctxt->i4_ctb_x)

                {

                    ctb_addr = (ps_bs_ctxt->i4_ctb_x - 1) + (ps_bs_ctxt->i4_ctb_y * ps_sps->i2_pic_wd_in_ctb);

                    left_slice_idx = ps_bs_ctxt->pu1_slice_idx[ctb_addr];

                }

                if(!((ps_bs_ctxt->ps_slice_hdr->i1_dependent_slice_flag == 1) && (slice_idx == left_slice_idx)))

                {

                    /* Removed reduntant checks */

                    if((0 == i1_loop_filter_across_slices_enabled_flag && (

                                    (0 == ps_bs_ctxt->i4_ctb_slice_x && 0 == ps_bs_ctxt->i4_ctb_slice_y) ||

                                    ((0 == ps_bs_ctxt->i4_ctb_tile_x) && (slice_idx != left_slice_idx)))) || (0 == ps_bs_ctxt->i4_ctb_x))

                    {

                        pu4_vert_bs[0] &= (64 == ctb_size) ? 0 : ((UWORD32)0xFFFFFFFF) << (ctb_size / 2);

                    }

                }

            }

        }

        ctb_addr = ps_bs_ctxt->i4_ctb_x + (ps_bs_ctxt->i4_ctb_y * ps_sps->i2_pic_wd_in_ctb);

        slice_idx = ps_bs_ctxt->pu1_slice_idx[ctb_addr];

        if(ps_bs_ctxt->i4_ctb_y)

        {

            ctb_addr = (ps_bs_ctxt->i4_ctb_x) + ((ps_bs_ctxt->i4_ctb_y - 1) * ps_sps->i2_pic_wd_in_ctb);

            top_slice_idx = ps_bs_ctxt->pu1_slice_idx[ctb_addr];

        }

        /* If top neighbor is not available, then set BS for entire first row to zero */

        /* Removed reduntant checks */

        if((0 == i1_loop_filter_across_tiles_enabled_flag && 0 == ps_bs_ctxt->i4_ctb_tile_y)

                        || (0 == i1_loop_filter_across_slices_enabled_flag && ((slice_idx != top_slice_idx)))

                        || (0 == ps_bs_ctxt->i4_ctb_y))

        {

            pu4_horz_bs[0] &= (64 == ctb_size) ? 0 : ((UWORD32)0xFFFFFFFF) << (ctb_size / 2);

        }

    }

    /**

     *  Set BS of bottom and right frame boundaries to zero if it is an incomplete CTB

     *   (They might have set to  non zero values because of CBF of the current CTB)*/

    {

        WORD32 num_rows_remaining = (ps_sps->i2_pic_height_in_luma_samples - (ps_bs_ctxt->i4_ctb_y << log2_ctb_size)) >> 3;

        WORD32 num_cols_remaining = (ps_sps->i2_pic_width_in_luma_samples - (ps_bs_ctxt->i4_ctb_x << log2_ctb_size)) >> 3;

        if(num_rows_remaining < (ctb_size >> 3))

        {

            /* WORD32 offset = (((num_rows_remaining >> 3) & (MAX_CTB_SIZE / ctb_size - 1)) << (log2_ctb_size - 4));

             *  will reduce to the following assuming ctb size is one of 16, 32 and 64

             *  and deblocking is done on 8x8 grid

             */

            WORD32 offset;

            offset = (num_rows_remaining >> (6 - log2_ctb_size)) << 2;

            if(6 != log2_ctb_size)

                offset += (num_rows_remaining & 1) << (log2_ctb_size - 4);

            memset(((UWORD8 *)pu4_horz_bs) + offset, 0, 1 << (log2_ctb_size - 4));

        }

        if(num_cols_remaining < (ctb_size >> 3))

        {

            /* WORD32 offset = (((num_cols_remaining >> 3) & (MAX_CTB_SIZE / ctb_size - 1)) << (log2_ctb_size - 4));

             *  will reduce to the following assuming ctb size is one of 16, 32 and 64

             *  and deblocking is done on 8x8 grid

             */

            WORD32 offset;

            offset = (num_cols_remaining >> (6 - log2_ctb_size)) << 2;

            if(6 != log2_ctb_size)

                offset += (num_cols_remaining & 1) << (log2_ctb_size - 4);

            memset(((UWORD8 *)pu4_vert_bs) + offset, 0, 1 << (log2_ctb_size - 4));

        }

    }

    return 0;

}