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

 *

 * Copyright (C) 2018 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 ihevce_enc_subpel_gen.c

*

* \brief

*    This file contains Padding and Subpel plane generation functions

*    at CTB level

*

* \date

*    29/12/2012

*

* \author

*    Ittiam

*

*

* List of Functions

* - ihevce_suppel_padding()

* - ihevce_pad_interp_recon_ctb()

*

*

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

*/

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

/* File Includes                                                             */

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

/* System include files */

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#include <assert.h>

#include <stdarg.h>

#include <math.h>

/* User include files */

#include "ihevc_typedefs.h"

#include "itt_video_api.h"

#include "ihevce_api.h"

#include "rc_cntrl_param.h"

#include "rc_frame_info_collector.h"

#include "rc_look_ahead_params.h"

#include "ihevc_defs.h"

#include "ihevc_debug.h"

#include "ihevc_macros.h"

#include "ihevc_structs.h"

#include "ihevc_platform_macros.h"

#include "ihevc_deblk.h"

#include "ihevc_itrans_recon.h"

#include "ihevc_chroma_itrans_recon.h"

#include "ihevc_chroma_intra_pred.h"

#include "ihevc_intra_pred.h"

#include "ihevc_inter_pred.h"

#include "ihevc_mem_fns.h"

#include "ihevc_padding.h"

#include "ihevc_weighted_pred.h"

#include "ihevc_sao.h"

#include "ihevc_resi_trans.h"

#include "ihevc_quant_iquant_ssd.h"

#include "ihevc_cabac_tables.h"

#include "ihevc_trans_tables.h"

#include "ihevc_trans_macros.h"

#include "ihevce_defs.h"

#include "ihevce_lap_enc_structs.h"

#include "ihevce_multi_thrd_structs.h"

#include "ihevce_multi_thrd_funcs.h"

#include "ihevce_me_common_defs.h"

#include "ihevce_had_satd.h"

#include "ihevce_error_codes.h"

#include "ihevce_bitstream.h"

#include "ihevce_cabac.h"

#include "ihevce_rdoq_macros.h"

#include "ihevce_function_selector.h"

#include "ihevce_enc_structs.h"

#include "ihevce_global_tables.h"

#include "ihevce_cmn_utils_instr_set_router.h"

#include "ihevce_entropy_structs.h"

#include "ihevce_enc_loop_structs.h"

#include "ihevce_enc_loop_utils.h"

#include "ihevce_inter_pred.h"

#include "ihevce_common_utils.h"

/*!

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

* \if Function name : ihevce_suppel_padding \endif

*

* \brief

*    Subpel Plane planes Padding Function

*

* \param[in] pu1_dst : pointer to subpel plane

*            stride  : subpel plane stride same as recon stride

*            tot_wd  : width of the block in subpel plane

*            tot_ht  : hieght of the block in subpel plane

*            ctb_ctr   : ctb horizontal position

*            vert_ctr  : ctb vertical position

*            ps_frm_ctb_prms : CTB characteristics parameters

* \return

*    None

*

*

* \author

*  Ittiam

*

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

*/

void ihevce_subpel_padding(

    UWORD8 *pu1_dst,

    WORD32 stride,

    WORD32 tot_wd,

    WORD32 tot_ht,

    WORD32 pad_subpel_x,

    WORD32 pad_subpel_y,

    WORD32 ctb_ctr,

    WORD32 vert_ctr,

    WORD32 i4_num_ctbs_horz,

    WORD32 i4_num_ctbs_vert,

    func_selector_t *ps_func_selector)

{

    ihevc_pad_top_ft *pf_pad_top = ps_func_selector->ihevc_pad_top_fptr;

    ihevc_pad_bottom_ft *pf_pad_bottom = ps_func_selector->ihevc_pad_bottom_fptr;

    ihevc_pad_left_luma_ft *pf_pad_left_luma = ps_func_selector->ihevc_pad_left_luma_fptr;

    ihevc_pad_right_luma_ft *pf_pad_right_luma = ps_func_selector->ihevc_pad_right_luma_fptr;

    UWORD8 *pu1_dst_tmp = pu1_dst;

    WORD32 cpy_ht = tot_ht;

    /* Top padding*/

    if(vert_ctr == 0)

    {

        PAD_BUF_VER(pu1_dst, stride, tot_wd, pad_subpel_x, pad_subpel_y, pf_pad_top);

        /*if curr ctb is 1st ctb in ctb row, update dst pointer for Left padding*/

        pu1_dst_tmp = pu1_dst - pad_subpel_y * stride;

        cpy_ht += pad_subpel_y;

    }

    /*bottom padding*/

    if(vert_ctr == (i4_num_ctbs_vert - 1))

    {

        PAD_BUF_VER(

            (pu1_dst + (tot_ht * stride)),

            stride,

            tot_wd,

            pad_subpel_x,

            pad_subpel_y,

            pf_pad_bottom);

        /*if curr ctb is 1st ctb in ctb row, update dst pointer for right padding*/

        cpy_ht += pad_subpel_y;

    }

    /*left padding*/

    if(ctb_ctr == 0)

    {

        PAD_BUF_HOR(pu1_dst_tmp, stride, cpy_ht, pad_subpel_x, pad_subpel_y, pf_pad_left_luma);

    }

    /*right padding*/

    if(ctb_ctr == (i4_num_ctbs_horz - 1))

    {

        PAD_BUF_HOR(

            pu1_dst_tmp + tot_wd, stride, cpy_ht, pad_subpel_x, pad_subpel_y, pf_pad_right_luma);

    }

}

/*!

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

* \if Function name : ihevce_pad_interp_recon_ctb \endif

*

* \brief

*    Ctb level Subpel Plane generation and padding function

*

* \param[in]

* s_cu_prms : coding unit params structures (recon buffers)

*            ctb_ctr   : ctb horizontal position

*            vert_ctr  : ctb vertical position

*            ps_frm_ctb_prms : CTB characteristics parameters

* i4_dist_nbr_mask : nbr-mask for distributed mode. Should be 0 for standalone

*                    or distributed-single-client mode

*

* \return

*    None

*

* \author

*  Ittiam

*

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

*/

void ihevce_pad_interp_recon_ctb(

    pad_interp_recon_frm_t *ps_pad_interp_recon,

    WORD32 ctb_ctr,

    WORD32 vert_ctr,

    WORD32 quality_preset,

    frm_ctb_ctxt_t *ps_frm_ctb_prms,

    WORD16 *pi2_hxhy_interm,

    WORD32 i4_bitrate_instance_id,

    func_selector_t *ps_func_selector)

{

    UWORD8 *pu1_src, *pu1_src_uv;

    WORD32 stride, stride_uv, wd, ht, wd_uv, ht_uv, pad_x, pad_y, pad_subpel_x, pad_subpel_y;

    WORD32 tot_wd, tot_ht, offset, cpy_ht_y, cpy_ht_uv;

    WORD32 i4_chroma_vert_pad_default;

    WORD32 ctb_size = ps_frm_ctb_prms->i4_ctb_size;

    UWORD8 *pu1_dst_hxfy = ps_pad_interp_recon->pu1_sbpel_hxfy +

                           (vert_ctr * ctb_size * ps_pad_interp_recon->i4_luma_recon_stride) +

                           (ctb_ctr * ctb_size);

    UWORD8 *pu1_dst_fxhy = ps_pad_interp_recon->pu1_sbpel_fxhy +

                           (vert_ctr * ctb_size * ps_pad_interp_recon->i4_luma_recon_stride) +

                           (ctb_ctr * ctb_size);

    UWORD8 *pu1_dst_hxhy = ps_pad_interp_recon->pu1_sbpel_hxhy +

                           (vert_ctr * ctb_size * ps_pad_interp_recon->i4_luma_recon_stride) +

                           (ctb_ctr * ctb_size);

    UWORD8 u1_is_422 = (ps_pad_interp_recon->u1_chroma_array_type == 2);

    ihevc_inter_pred_ft *pf_inter_pred_luma_horz =

        ps_func_selector->ihevc_inter_pred_luma_horz_fptr;

    ihevc_inter_pred_ft *pf_inter_pred_luma_vert =

        ps_func_selector->ihevc_inter_pred_luma_vert_fptr;

    ihevc_inter_pred_w16out_ft *pf_inter_pred_luma_horz_w16out =

        ps_func_selector->ihevc_inter_pred_luma_horz_w16out_fptr;

    ihevc_inter_pred_w16inp_ft *pf_inter_pred_luma_vert_w16inp =

        ps_func_selector->ihevc_inter_pred_luma_vert_w16inp_fptr;

    stride = ps_pad_interp_recon->i4_luma_recon_stride;

    wd = ps_pad_interp_recon->i4_ctb_size;

    ht = ps_pad_interp_recon->i4_ctb_size;

    pu1_src = (UWORD8 *)ps_pad_interp_recon->pu1_luma_recon + (vert_ctr * ctb_size * stride) +

              (ctb_ctr * ctb_size);

    stride_uv = ps_pad_interp_recon->i4_chrm_recon_stride;

    wd_uv = ps_pad_interp_recon->i4_ctb_size;

    ht_uv = ps_pad_interp_recon->i4_ctb_size >> (0 == u1_is_422);

    pu1_src_uv = (UWORD8 *)ps_pad_interp_recon->pu1_chrm_recon +

                 (vert_ctr * (ctb_size >> (0 == u1_is_422)) * stride_uv) + (ctb_ctr * ctb_size);

    pad_x = ALIGN8(NTAPS_LUMA);

    pad_y = ALIGN8(NTAPS_LUMA);

    pad_subpel_x = PAD_HORZ - pad_x;

    pad_subpel_y = PAD_VERT - pad_y;

    offset = pad_x + (pad_y * stride);

    tot_wd = wd + (pad_x << 1);

    tot_ht = ht + (pad_y << 1);

    i4_chroma_vert_pad_default = PAD_VERT >> (0 == u1_is_422);

    if(ctb_ctr == (ps_frm_ctb_prms->i4_num_ctbs_horz - 1))

    {

        WORD32 last_ctb_x =

            ps_frm_ctb_prms->i4_cu_aligned_pic_wd -

            ((ps_frm_ctb_prms->i4_num_ctbs_horz - 1) * ps_pad_interp_recon->i4_ctb_size);

        wd = last_ctb_x;

        wd_uv = last_ctb_x;

    }

    if(vert_ctr == (ps_frm_ctb_prms->i4_num_ctbs_vert - 1))

    {

        WORD32 last_ctb_y =

            ps_frm_ctb_prms->i4_cu_aligned_pic_ht -

            ((ps_frm_ctb_prms->i4_num_ctbs_vert - 1) * ps_pad_interp_recon->i4_ctb_size);

        ht = last_ctb_y;

        ht_uv = last_ctb_y >> (0 == u1_is_422);

    }

    tot_ht = ht;

    tot_wd = wd;

    /*top padding*/

    if(vert_ctr == 0)

    {

        tot_ht = pad_y + ht - 8;

    }

    /*bottom padding*/

    if(vert_ctr == (ps_frm_ctb_prms->i4_num_ctbs_vert - 1))

    {

        tot_ht = pad_y + ht + 8;

    }

    /*Left padding*/

    if(ctb_ctr == 0)

    {

        tot_wd = pad_x + wd - 8;

    }

    /*right padding*/

    if(ctb_ctr == (ps_frm_ctb_prms->i4_num_ctbs_horz - 1))

    {

        tot_wd = pad_x + wd + 8;

    }

    pu1_src -= offset;

    pu1_dst_hxhy -= offset;

    pu1_dst_hxfy -= offset;

    pu1_dst_fxhy -= offset;

    {

        tot_wd = ALIGN16(tot_wd);

        if(0 ==

           i4_bitrate_instance_id)  //do the following subpel calculations for reference bit-rate instance only

        {

            /* HxFY plane */

            pf_inter_pred_luma_horz(

                pu1_src,

                pu1_dst_hxfy,

                stride,

                stride,

                (WORD8 *)gai1_hevc_luma_filter_taps[2],

                tot_ht,

                tot_wd);

            pf_inter_pred_luma_vert(

                pu1_src,

                pu1_dst_fxhy,

                stride,

                stride,

                (WORD8 *)gai1_hevc_luma_filter_taps[2],

                tot_ht,

                tot_wd);

            pf_inter_pred_luma_horz_w16out(

                pu1_src - 3 * stride,

                pi2_hxhy_interm,

                stride,

                tot_wd,

                (WORD8 *)gai1_hevc_luma_filter_taps[2],

                (tot_ht + 7),

                tot_wd);

            /* "Stride" of intermediate buffer in pixels,equals tot_wd */

            pf_inter_pred_luma_vert_w16inp(

                pi2_hxhy_interm + (3 * tot_wd),

                pu1_dst_hxhy,

                tot_wd,

                stride,

                (WORD8 *)gai1_hevc_luma_filter_taps[2],

                tot_ht,

                tot_wd);

            ihevce_subpel_padding(

                pu1_dst_fxhy,

                stride,

                tot_wd,

                tot_ht,

                pad_subpel_x,

                pad_subpel_y,

                ctb_ctr,

                vert_ctr,

                ps_frm_ctb_prms->i4_num_ctbs_horz,

                ps_frm_ctb_prms->i4_num_ctbs_vert,

                ps_func_selector);

            ihevce_subpel_padding(

                pu1_dst_hxfy,

                stride,

                tot_wd,

                tot_ht,

                pad_subpel_x,

                pad_subpel_y,

                ctb_ctr,

                vert_ctr,

                ps_frm_ctb_prms->i4_num_ctbs_horz,

                ps_frm_ctb_prms->i4_num_ctbs_vert,

                ps_func_selector);

            ihevce_subpel_padding(

                pu1_dst_hxhy,

                stride,

                tot_wd,

                tot_ht,

                pad_subpel_x,

                pad_subpel_y,

                ctb_ctr,

                vert_ctr,

                ps_frm_ctb_prms->i4_num_ctbs_horz,

                ps_frm_ctb_prms->i4_num_ctbs_vert,

                ps_func_selector);

        }

    }

}

void ihevce_recon_padding(

    pad_interp_recon_frm_t *ps_pad_interp_recon,

    WORD32 ctb_ctr,

    WORD32 vert_ctr,

    frm_ctb_ctxt_t *ps_frm_ctb_prms,

    func_selector_t *ps_func_selector)

{

    UWORD8 *pu1_src, *pu1_src_uv, *pu1_buf_y, *pu1_buf_uv;

    WORD32 stride, stride_uv, wd, ht, wd_uv, ht_uv;

    WORD32 cpy_ht_y, cpy_ht_uv;

    WORD32 i4_chroma_vert_pad_default;

    WORD32 top_extra_pix = 0, left_extra_pix = 0;

    WORD32 ctb_size = ps_frm_ctb_prms->i4_ctb_size;

    UWORD8 u1_is_422 = (ps_pad_interp_recon->u1_chroma_array_type == 2);

    ihevc_pad_top_ft *pf_pad_top = ps_func_selector->ihevc_pad_top_fptr;

    ihevc_pad_bottom_ft *pf_pad_bottom = ps_func_selector->ihevc_pad_bottom_fptr;

    ihevc_pad_left_luma_ft *pf_pad_left_luma = ps_func_selector->ihevc_pad_left_luma_fptr;

    ihevc_pad_left_chroma_ft *pf_pad_left_chroma = ps_func_selector->ihevc_pad_left_chroma_fptr;

    ihevc_pad_right_luma_ft *pf_pad_right_luma = ps_func_selector->ihevc_pad_right_luma_fptr;

    ihevc_pad_right_chroma_ft *pf_pad_right_chroma = ps_func_selector->ihevc_pad_right_chroma_fptr;

    stride = ps_pad_interp_recon->i4_luma_recon_stride;

    wd = ps_pad_interp_recon->i4_ctb_size;

    ht = ps_pad_interp_recon->i4_ctb_size;

    pu1_src = (UWORD8 *)ps_pad_interp_recon->pu1_luma_recon + (vert_ctr * ctb_size * stride) +

              (ctb_ctr * ctb_size);

    stride_uv = ps_pad_interp_recon->i4_chrm_recon_stride;

    wd_uv = ps_pad_interp_recon->i4_ctb_size;

    ht_uv = ps_pad_interp_recon->i4_ctb_size >> (0 == u1_is_422);

    pu1_src_uv = (UWORD8 *)ps_pad_interp_recon->pu1_chrm_recon +

                 (vert_ctr * (ctb_size >> (0 == u1_is_422)) * stride_uv) + (ctb_ctr * ctb_size);

    i4_chroma_vert_pad_default = PAD_VERT >> (0 == u1_is_422);

    if(ctb_ctr == (ps_frm_ctb_prms->i4_num_ctbs_horz - 1))

    {

        WORD32 last_ctb_x =

            ps_frm_ctb_prms->i4_cu_aligned_pic_wd -

            ((ps_frm_ctb_prms->i4_num_ctbs_horz - 1) * ps_pad_interp_recon->i4_ctb_size);

        wd = last_ctb_x;

        wd_uv = last_ctb_x;

    }

    if(vert_ctr == (ps_frm_ctb_prms->i4_num_ctbs_vert - 1))

    {

        WORD32 last_ctb_y =

            ps_frm_ctb_prms->i4_cu_aligned_pic_ht -

            ((ps_frm_ctb_prms->i4_num_ctbs_vert - 1) * ps_pad_interp_recon->i4_ctb_size);

        ht = last_ctb_y;

        ht_uv = last_ctb_y >> (0 == u1_is_422);

    }

    pu1_buf_y = pu1_src;

    pu1_buf_uv = pu1_src_uv;

    cpy_ht_y = ht;

    cpy_ht_uv = ht_uv;

    if(vert_ctr > 0)

    {

        top_extra_pix = 8;

    }

    if(ctb_ctr > 0)

    {

        left_extra_pix = 8;

    }

    /*top padding*/

    if(vert_ctr == 0)

    {

        PAD_BUF_VER(

            pu1_src - left_extra_pix, stride, wd + left_extra_pix, PAD_HORZ, PAD_VERT, pf_pad_top);

        PAD_BUF_VER(

            pu1_src_uv - left_extra_pix,

            stride_uv,

            wd_uv + left_extra_pix,

            PAD_HORZ,

            i4_chroma_vert_pad_default,

            pf_pad_top);

        /*if curr ctb is 1st ctb in ctb row, update dst pointer for Left padding*/

        pu1_buf_y = pu1_src - PAD_VERT * stride;

        pu1_buf_uv = pu1_src_uv - i4_chroma_vert_pad_default * stride_uv;

        cpy_ht_y += PAD_VERT;

        cpy_ht_uv += i4_chroma_vert_pad_default;

    }

    /*bottom padding*/

    if(vert_ctr == (ps_frm_ctb_prms->i4_num_ctbs_vert - 1))

    {

        PAD_BUF_VER(

            ((pu1_src - left_extra_pix) + (ht * stride)),

            stride,

            wd + left_extra_pix,

            PAD_HORZ,

            PAD_VERT,

            pf_pad_bottom);

        PAD_BUF_VER(

            ((pu1_src_uv - left_extra_pix) + (ht_uv * stride_uv)),

            stride_uv,

            wd_uv + left_extra_pix,

            PAD_HORZ,

            i4_chroma_vert_pad_default,

            pf_pad_bottom);

        /*if curr ctb is 1st ctb in ctb row, update dst pointer for right padding*/

        cpy_ht_y += PAD_VERT;

        cpy_ht_uv += i4_chroma_vert_pad_default;

    }

    /*Left padding*/

    if(ctb_ctr == 0)

    {

        PAD_BUF_HOR(

            (pu1_buf_y - top_extra_pix * stride),

            stride,

            cpy_ht_y + top_extra_pix,

            PAD_HORZ,

            PAD_VERT,

            pf_pad_left_luma);

        PAD_BUF_HOR(

            pu1_buf_uv - (top_extra_pix >> 1) * (u1_is_422 + 1) * stride_uv,

            stride_uv,

            cpy_ht_uv + (top_extra_pix >> 1) * (u1_is_422 + 1),

            PAD_HORZ,

            i4_chroma_vert_pad_default,

            pf_pad_left_chroma);

    }

    /*right padding*/

    if(ctb_ctr == (ps_frm_ctb_prms->i4_num_ctbs_horz - 1))

    {

        PAD_BUF_HOR(

            ((pu1_buf_y - (top_extra_pix * stride)) + wd),

            stride,

            cpy_ht_y + top_extra_pix,

            PAD_HORZ,

            PAD_VERT,

            pf_pad_right_luma);

        PAD_BUF_HOR(

            ((pu1_buf_uv - ((top_extra_pix >> 1) * (u1_is_422 + 1) * stride_uv)) + wd_uv),

            stride_uv,

            cpy_ht_uv + (top_extra_pix >> 1) * (u1_is_422 + 1),

            PAD_HORZ,

            i4_chroma_vert_pad_default,

            pf_pad_right_chroma);

    }

}

void ihevce_pad_interp_recon_src_ctb(

    pad_interp_recon_frm_t *ps_pad_interp_recon,

    WORD32 ctb_ctr,

    WORD32 vert_ctr,

    frm_ctb_ctxt_t *ps_frm_ctb_prms,

    WORD32 i4_bitrate_instance_id,

    func_selector_t *ps_func_selector,

    WORD32 is_chroma_needs_padding)

{

    UWORD8 *pu1_src, *pu1_src_uv;

    WORD32 stride, stride_uv, wd, ht, wd_uv, ht_uv, pad_x, pad_y;

    WORD32 tot_wd, tot_ht;

    WORD32 i4_chroma_vert_pad_default;

    WORD32 ctb_size = ps_frm_ctb_prms->i4_ctb_size;

    UWORD8 u1_is_422 = (ps_pad_interp_recon->u1_chroma_array_type == 2);

    ihevc_pad_top_ft *pf_pad_top = ps_func_selector->ihevc_pad_top_fptr;

    ihevc_pad_bottom_ft *pf_pad_bottom = ps_func_selector->ihevc_pad_bottom_fptr;

    ihevc_pad_left_luma_ft *pf_pad_left_luma = ps_func_selector->ihevc_pad_left_luma_fptr;

    ihevc_pad_left_chroma_ft *pf_pad_left_chroma = ps_func_selector->ihevc_pad_left_chroma_fptr;

    ihevc_pad_right_luma_ft *pf_pad_right_luma = ps_func_selector->ihevc_pad_right_luma_fptr;

    ihevc_pad_right_chroma_ft *pf_pad_right_chroma = ps_func_selector->ihevc_pad_right_chroma_fptr;

    /* Luma padding */

    pu1_src = (UWORD8 *)ps_pad_interp_recon->pu1_luma_recon_src +

              (vert_ctr * ctb_size * ps_pad_interp_recon->i4_luma_recon_stride) +

              (ctb_ctr * ctb_size);

    stride = ps_pad_interp_recon->i4_luma_recon_stride;

    wd = ps_pad_interp_recon->i4_ctb_size;

    ht = ps_pad_interp_recon->i4_ctb_size;

    pu1_src_uv =

        (UWORD8 *)ps_pad_interp_recon->pu1_chrm_recon_src +

        (vert_ctr * (ctb_size >> (0 == u1_is_422)) * ps_pad_interp_recon->i4_chrm_recon_stride) +

        (ctb_ctr * ctb_size);

    stride_uv = ps_pad_interp_recon->i4_chrm_recon_stride;

    wd_uv = ps_pad_interp_recon->i4_ctb_size;

    ht_uv = ps_pad_interp_recon->i4_ctb_size >> (0 == u1_is_422);

    pad_x = ALIGN8(NTAPS_LUMA);

    pad_y = ALIGN8(NTAPS_LUMA);

    tot_wd = wd + (pad_x << 1);

    tot_ht = ht + (pad_y << 1);

    i4_chroma_vert_pad_default = PAD_VERT >> (0 == u1_is_422);

    if(ctb_ctr == (ps_frm_ctb_prms->i4_num_ctbs_horz - 1))

    {

        WORD32 last_ctb_x =

            ps_frm_ctb_prms->i4_cu_aligned_pic_wd -

            ((ps_frm_ctb_prms->i4_num_ctbs_horz - 1) * ps_pad_interp_recon->i4_ctb_size);

        wd = last_ctb_x;

        wd_uv = last_ctb_x;

    }

    if(vert_ctr == (ps_frm_ctb_prms->i4_num_ctbs_vert - 1))

    {

        WORD32 last_ctb_y =

            ps_frm_ctb_prms->i4_cu_aligned_pic_ht -

            ((ps_frm_ctb_prms->i4_num_ctbs_vert - 1) * ps_pad_interp_recon->i4_ctb_size);

        ht = last_ctb_y;

        ht_uv = last_ctb_y >> (0 == u1_is_422);

    }

    if(ctb_ctr == 0)

    {

        if(vert_ctr == 0)

        {

            PAD_BUF_HOR(pu1_src, stride, ht, PAD_HORZ, PAD_VERT, pf_pad_left_luma);

            PAD_BUF_VER(pu1_src - PAD_HORZ, stride, PAD_HORZ + wd, PAD_HORZ, PAD_VERT, pf_pad_top);

            if(is_chroma_needs_padding)

            {

                PAD_BUF_HOR(

                    pu1_src_uv,

                    stride_uv,

                    ht_uv,

                    PAD_HORZ,

                    i4_chroma_vert_pad_default,

                    pf_pad_left_chroma);

                PAD_BUF_VER(

                    pu1_src_uv - PAD_HORZ,

                    stride_uv,

                    PAD_HORZ + wd_uv,

                    PAD_HORZ,

                    i4_chroma_vert_pad_default,

                    pf_pad_top);

            }

        }

        else if(vert_ctr == (ps_frm_ctb_prms->i4_num_ctbs_vert - 1))

        {

            PAD_BUF_HOR(pu1_src - 8 * stride, stride, ht + 8, PAD_HORZ, PAD_VERT, pf_pad_left_luma);

            PAD_BUF_VER(

                (pu1_src - PAD_HORZ + (ht * stride)),

                stride,

                PAD_HORZ + wd,

                PAD_HORZ,

                PAD_VERT,

                pf_pad_bottom);

            if(is_chroma_needs_padding)

            {

                PAD_BUF_HOR(

                    pu1_src_uv - 4 * (u1_is_422 + 1) * stride_uv,

                    stride_uv,

                    ht_uv + 4 * (u1_is_422 + 1),

                    PAD_HORZ,

                    i4_chroma_vert_pad_default,

                    pf_pad_left_chroma);

                PAD_BUF_VER(

                    (pu1_src_uv - PAD_HORZ + (ht_uv * stride_uv)),

                    stride_uv,

                    PAD_HORZ + wd_uv,

                    PAD_HORZ,

                    i4_chroma_vert_pad_default,

                    pf_pad_bottom);

            }

        }

        else

        {

            PAD_BUF_HOR(pu1_src - 8 * stride, stride, ht + 8, PAD_HORZ, PAD_VERT, pf_pad_left_luma);

            if(is_chroma_needs_padding)

            {

                PAD_BUF_HOR(

                    pu1_src_uv - 4 * (u1_is_422 + 1) * stride_uv,

                    stride_uv,

                    ht_uv + 4 * (u1_is_422 + 1),

                    PAD_HORZ,

                    i4_chroma_vert_pad_default,

                    pf_pad_left_chroma);

            }

        }

    }

    else if(ctb_ctr == (ps_frm_ctb_prms->i4_num_ctbs_horz - 1))

    {

        if(vert_ctr == 0)

        {

            PAD_BUF_HOR(pu1_src + wd, stride, ht, PAD_HORZ, PAD_VERT, pf_pad_right_luma);

            PAD_BUF_VER(pu1_src - 8, stride, PAD_HORZ + (wd + 8), PAD_HORZ, PAD_VERT, pf_pad_top);

            if(is_chroma_needs_padding)

            {

                PAD_BUF_HOR(

                    pu1_src_uv + wd_uv,

                    stride_uv,

                    ht_uv,

                    PAD_HORZ,

                    i4_chroma_vert_pad_default,

                    pf_pad_right_chroma);

                PAD_BUF_VER(

                    pu1_src_uv - 8,

                    stride_uv,

                    PAD_HORZ + (wd_uv + 8),

                    PAD_HORZ,

                    i4_chroma_vert_pad_default,

                    pf_pad_top);

            }

        }

        else if(vert_ctr == (ps_frm_ctb_prms->i4_num_ctbs_vert - 1))

        {

            PAD_BUF_HOR(

                (pu1_src - (8 * stride) + wd),

                stride,

                ht + 8,

                PAD_HORZ,

                PAD_VERT,

                pf_pad_right_luma);

            PAD_BUF_VER(

                (pu1_src - 8 + (ht * stride)),

                stride,

                PAD_HORZ + (wd + 8),

                PAD_HORZ,

                PAD_VERT,

                pf_pad_bottom);

            if(is_chroma_needs_padding)

            {

                PAD_BUF_HOR(

                    (pu1_src_uv - (4 * (u1_is_422 + 1) * stride_uv) + wd_uv),

                    stride_uv,

                    ht_uv + 4 * (u1_is_422 + 1),

                    PAD_HORZ,

                    i4_chroma_vert_pad_default,

                    pf_pad_right_chroma);

                PAD_BUF_VER(

                    (pu1_src_uv - 8 + (ht_uv * stride_uv)),

                    stride_uv,

                    PAD_HORZ + (wd_uv + 8),

                    PAD_HORZ,

                    i4_chroma_vert_pad_default,

                    pf_pad_bottom);

            }

        }

        else

        {

            PAD_BUF_HOR(

                (pu1_src - (8 * stride) + wd),

                stride,

                ht + 8,

                PAD_HORZ,

                PAD_VERT,

                pf_pad_right_luma);

            if(is_chroma_needs_padding)

            {

                PAD_BUF_HOR(

                    (pu1_src_uv - (4 * (u1_is_422 + 1) * stride_uv) + wd_uv),

                    stride_uv,

                    ht_uv + 4 * (u1_is_422 + 1),

                    PAD_HORZ,

                    i4_chroma_vert_pad_default,

                    pf_pad_right_chroma);

            }

        }

    }

    else if(vert_ctr == 0)

    {

        PAD_BUF_VER(pu1_src - 8, stride, (wd + 8), PAD_HORZ, PAD_VERT, pf_pad_top);

        if(is_chroma_needs_padding)

        {

            PAD_BUF_VER(

                pu1_src_uv - 8,

                stride_uv,

                (wd_uv + 8),

                PAD_HORZ,

                i4_chroma_vert_pad_default,

                pf_pad_top);

        }

    }

    else if(vert_ctr == (ps_frm_ctb_prms->i4_num_ctbs_vert - 1))

    {

        PAD_BUF_VER(

            (pu1_src - 8 + (ht * stride)), stride, (wd + 8), PAD_HORZ, PAD_VERT, pf_pad_bottom);

        if(is_chroma_needs_padding)

        {

            PAD_BUF_VER(

                (pu1_src_uv - 8 + (ht_uv * stride_uv)),

                stride_uv,

                (wd_uv + 8),

                PAD_HORZ,

                i4_chroma_vert_pad_default,

                pf_pad_bottom);

        }

    }

}