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

*

* 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_sao.c

*

* @brief

*  Contains leaf level function definitions for sample adaptive offset process

*

* @author

*  Srinivas T

*

* @par List of Functions:

*   - ihevc_sao_band_offset_luma()

*   - ihevc_sao_band_offset_chroma()

*   - ihevc_sao_edge_offset_class0()

*   - ihevc_sao_edge_offset_class0_chroma()

*   - ihevc_sao_edge_offset_class1()

*   - ihevc_sao_edge_offset_class1_chroma()

*   - ihevc_sao_edge_offset_class2()

*   - ihevc_sao_edge_offset_class2_chroma()

*   - ihevc_sao_edge_offset_class3()

*   - ihevc_sao_edge_offset_class3_chroma()

* @remarks

*  None

*

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

*/

#include <stdlib.h>

#include <assert.h>

#include <string.h>

#include "ihevc_typedefs.h"

#include "ihevc_macros.h"

#include "ihevc_platform_macros.h"

#include "ihevc_func_selector.h"

#include "ihevc_defs.h"

#include "ihevc_structs.h"

#include "ihevc_sao.h"

#define NUM_BAND_TABLE  32

const WORD32 gi4_ihevc_table_edge_idx[5] = { 1, 2, 0, 3, 4 };

/**

 * au4_avail is an array of flags - one for each neighboring block specifying if the block is available

 * au4_avail[0] - left

 * au4_avail[1] - right

 * au4_avail[2] - top

 * au4_avail[3] - bottom

 * au4_avail[4] - top-left

 * au4_avail[5] - top-right

 * au4_avail[6] - bottom-left

 * au4_avail[7] - bottom-right

 */

void ihevc_sao_band_offset_luma(UWORD8 *pu1_src,

                                WORD32 src_strd,

                                UWORD8 *pu1_src_left,

                                UWORD8 *pu1_src_top,

                                UWORD8 *pu1_src_top_left,

                                WORD32 sao_band_pos,

                                WORD8 *pi1_sao_offset,

                                WORD32 wd,

                                WORD32 ht)

{

    WORD32 band_shift;

    WORD32 band_table[NUM_BAND_TABLE];

    WORD32 i;

    WORD32 row, col;

    /* Updating left and top and top-left */

    for(row = 0; row < ht; row++)

    {

        pu1_src_left[row] = pu1_src[row * src_strd + (wd - 1)];

    }

    pu1_src_top_left[0] = pu1_src_top[wd - 1];

    for(col = 0; col < wd; col++)

    {

        pu1_src_top[col] = pu1_src[(ht - 1) * src_strd + col];

    }

    band_shift = BIT_DEPTH_LUMA - 5;

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

    {

        band_table[i] = 0;

    }

    for(i = 0; i < 4; i++)

    {

        band_table[(i + sao_band_pos) & 31] = i + 1;

    }

    for(row = 0; row < ht; row++)

    {

        for(col = 0; col < wd; col++)

        {

            WORD32 band_idx;

            band_idx = band_table[pu1_src[col] >> band_shift];

            pu1_src[col] = CLIP3(pu1_src[col] + pi1_sao_offset[band_idx], 0, (1 << (band_shift + 5)) - 1);

        }

        pu1_src += src_strd;

    }

}

/* input 'wd' has to be for the interleaved block and not for each color component */

void ihevc_sao_band_offset_chroma(UWORD8 *pu1_src,

                                  WORD32 src_strd,

                                  UWORD8 *pu1_src_left,

                                  UWORD8 *pu1_src_top,

                                  UWORD8 *pu1_src_top_left,

                                  WORD32 sao_band_pos_u,

                                  WORD32 sao_band_pos_v,

                                  WORD8 *pi1_sao_offset_u,

                                  WORD8 *pi1_sao_offset_v,

                                  WORD32 wd,

                                  WORD32 ht)

{

    WORD32 band_shift;

    WORD32 band_table_u[NUM_BAND_TABLE];

    WORD32 band_table_v[NUM_BAND_TABLE];

    WORD32 i;

    WORD32 row, col;

    /* Updating left and top and top-left */

    for(row = 0; row < ht; row++)

    {

        pu1_src_left[2 * row] = pu1_src[row * src_strd + (wd - 2)];

        pu1_src_left[2 * row + 1] = pu1_src[row * src_strd + (wd - 1)];

    }

    pu1_src_top_left[0] = pu1_src_top[wd - 2];

    pu1_src_top_left[1] = pu1_src_top[wd - 1];

    for(col = 0; col < wd; col++)

    {

        pu1_src_top[col] = pu1_src[(ht - 1) * src_strd + col];

    }

    band_shift = BIT_DEPTH_CHROMA - 5;

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

    {

        band_table_u[i] = 0;

        band_table_v[i] = 0;

    }

    for(i = 0; i < 4; i++)

    {

        band_table_u[(i + sao_band_pos_u) & 31] = i + 1;

        band_table_v[(i + sao_band_pos_v) & 31] = i + 1;

    }

    for(row = 0; row < ht; row++)

    {

        for(col = 0; col < wd; col++)

        {

            WORD32 band_idx;

            WORD8 *pi1_sao_offset;

            pi1_sao_offset = (0 == col % 2) ? pi1_sao_offset_u : pi1_sao_offset_v;

            band_idx = (0 == col % 2) ? band_table_u[pu1_src[col] >> band_shift] : band_table_v[pu1_src[col] >> band_shift];

            pu1_src[col] = CLIP3(pu1_src[col] + pi1_sao_offset[band_idx], 0, (1 << (band_shift + 5)) - 1);

        }

        pu1_src += src_strd;

    }

}

/* Horizontal filtering */

void ihevc_sao_edge_offset_class0(UWORD8 *pu1_src,

                                  WORD32 src_strd,

                                  UWORD8 *pu1_src_left,

                                  UWORD8 *pu1_src_top,

                                  UWORD8 *pu1_src_top_left,

                                  UWORD8 *pu1_src_top_right,

                                  UWORD8 *pu1_src_bot_left,

                                  UWORD8 *pu1_avail,

                                  WORD8 *pi1_sao_offset,

                                  WORD32 wd,

                                  WORD32 ht)

{

    WORD32 row, col;

    UWORD8 au1_mask[MAX_CTB_SIZE];

    UWORD8 au1_src_left_tmp[MAX_CTB_SIZE];

    WORD8 u1_sign_left, u1_sign_right;

    WORD32 bit_depth;

    UNUSED(pu1_src_top_right);

    UNUSED(pu1_src_bot_left);

    bit_depth = BIT_DEPTH_LUMA;

    /* Initialize the mask values */

    memset(au1_mask, 0xFF, MAX_CTB_SIZE);

    /* Update top and top-left arrays */

    *pu1_src_top_left = pu1_src_top[wd - 1];

    for(row = 0; row < ht; row++)

    {

        au1_src_left_tmp[row] = pu1_src[row * src_strd + wd - 1];

    }

    for(col = 0; col < wd; col++)

    {

        pu1_src_top[col] = pu1_src[(ht - 1) * src_strd + col];

    }

    /* Update masks based on the availability flags */

    if(0 == pu1_avail[0])

    {

        au1_mask[0] = 0;

    }

    if(0 == pu1_avail[1])

    {

        au1_mask[wd - 1] = 0;

    }

    /* Processing is done on the intermediate buffer and the output is written to the source buffer */

    {

        for(row = 0; row < ht; row++)

        {

            u1_sign_left = SIGN(pu1_src[0] - pu1_src_left[row]);

            for(col = 0; col < wd; col++)

            {

                WORD32 edge_idx;

                u1_sign_right = SIGN(pu1_src[col] - pu1_src[col + 1]);

                edge_idx = 2 + u1_sign_left + u1_sign_right;

                u1_sign_left = -u1_sign_right;

                edge_idx = gi4_ihevc_table_edge_idx[edge_idx] & au1_mask[col];

                if(0 != edge_idx)

                {

                    pu1_src[col] = CLIP3(pu1_src[col] + pi1_sao_offset[edge_idx], 0, (1 << bit_depth) - 1);

                }

            }

            pu1_src += src_strd;

        }

    }

    /* Update left array */

    for(row = 0; row < ht; row++)

    {

        pu1_src_left[row] = au1_src_left_tmp[row];

    }

}

/* input 'wd' has to be for the interleaved block and not for each color component */

void ihevc_sao_edge_offset_class0_chroma(UWORD8 *pu1_src,

                                         WORD32 src_strd,

                                         UWORD8 *pu1_src_left,

                                         UWORD8 *pu1_src_top,

                                         UWORD8 *pu1_src_top_left,

                                         UWORD8 *pu1_src_top_right,

                                         UWORD8 *pu1_src_bot_left,

                                         UWORD8 *pu1_avail,

                                         WORD8 *pi1_sao_offset_u,

                                         WORD8 *pi1_sao_offset_v,

                                         WORD32 wd,

                                         WORD32 ht)

{

    WORD32 row, col;

    UWORD8 au1_mask[MAX_CTB_SIZE];

    UWORD8 au1_src_left_tmp[2 * MAX_CTB_SIZE];

    WORD8 u1_sign_left_u, u1_sign_right_u;

    WORD8 u1_sign_left_v, u1_sign_right_v;

    WORD32 bit_depth;

    UNUSED(pu1_src_top_right);

    UNUSED(pu1_src_bot_left);

    bit_depth = BIT_DEPTH_CHROMA;

    /* Initialize the mask values */

    memset(au1_mask, 0xFF, MAX_CTB_SIZE);

    /* Update left, top and top-left arrays */

    pu1_src_top_left[0] = pu1_src_top[wd - 2];

    pu1_src_top_left[1] = pu1_src_top[wd - 1];

    for(row = 0; row < ht; row++)

    {

        au1_src_left_tmp[2 * row] = pu1_src[row * src_strd + wd - 2];

        au1_src_left_tmp[2 * row + 1] = pu1_src[row * src_strd + wd - 1];

    }

    for(col = 0; col < wd; col++)

    {

        pu1_src_top[col] = pu1_src[(ht - 1) * src_strd + col];

    }

    /* Update masks based on the availability flags */

    if(0 == pu1_avail[0])

    {

        au1_mask[0] = 0;

    }

    if(0 == pu1_avail[1])

    {

        au1_mask[(wd - 1) >> 1] = 0;

    }

    /* Processing is done on the intermediate buffer and the output is written to the source buffer */

    {

        for(row = 0; row < ht; row++)

        {

            u1_sign_left_u = SIGN(pu1_src[0] - pu1_src_left[2 * row]);

            u1_sign_left_v = SIGN(pu1_src[1] - pu1_src_left[2 * row + 1]);

            for(col = 0; col < wd; col++)

            {

                WORD32 edge_idx;

                WORD8 *pi1_sao_offset;

                if(0 == col % 2)

                {

                    pi1_sao_offset = pi1_sao_offset_u;

                    u1_sign_right_u = SIGN(pu1_src[col] - pu1_src[col + 2]);

                    edge_idx = 2 + u1_sign_left_u + u1_sign_right_u;

                    u1_sign_left_u = -u1_sign_right_u;

                }

                else

                {

                    pi1_sao_offset = pi1_sao_offset_v;

                    u1_sign_right_v = SIGN(pu1_src[col] - pu1_src[col + 2]);

                    edge_idx = 2 + u1_sign_left_v + u1_sign_right_v;

                    u1_sign_left_v = -u1_sign_right_v;

                }

                edge_idx = gi4_ihevc_table_edge_idx[edge_idx] & au1_mask[col >> 1];

                if(0 != edge_idx)

                {

                    pu1_src[col] = CLIP3(pu1_src[col] + pi1_sao_offset[edge_idx], 0, (1 << bit_depth) - 1);

                }

            }

            pu1_src += src_strd;

        }

    }

    for(row = 0; row < 2 * ht; row++)

    {

        pu1_src_left[row] = au1_src_left_tmp[row];

    }

}

/* Vertical filtering */

void ihevc_sao_edge_offset_class1(UWORD8 *pu1_src,

                                  WORD32 src_strd,

                                  UWORD8 *pu1_src_left,

                                  UWORD8 *pu1_src_top,

                                  UWORD8 *pu1_src_top_left,

                                  UWORD8 *pu1_src_top_right,

                                  UWORD8 *pu1_src_bot_left,

                                  UWORD8 *pu1_avail,

                                  WORD8 *pi1_sao_offset,

                                  WORD32 wd,

                                  WORD32 ht)

{

    WORD32 row, col;

    UWORD8 au1_mask[MAX_CTB_SIZE];

    UWORD8 au1_src_top_tmp[MAX_CTB_SIZE];

    WORD8 au1_sign_up[MAX_CTB_SIZE];

    WORD8 u1_sign_down;

    WORD32 bit_depth;

    UNUSED(pu1_src_top_right);

    UNUSED(pu1_src_bot_left);

    bit_depth = BIT_DEPTH_LUMA;

    /* Initialize the mask values */

    memset(au1_mask, 0xFF, MAX_CTB_SIZE);

    /* Update left, top and top-left arrays */

    *pu1_src_top_left = pu1_src_top[wd - 1];

    for(row = 0; row < ht; row++)

    {

        pu1_src_left[row] = pu1_src[row * src_strd + wd - 1];

    }

    for(col = 0; col < wd; col++)

    {

        au1_src_top_tmp[col] = pu1_src[(ht - 1) * src_strd + col];

    }

    /* Update height and source pointers based on the availability flags */

    if(0 == pu1_avail[2])

    {

        pu1_src += src_strd;

        ht--;

        for(col = 0; col < wd; col++)

        {

            au1_sign_up[col] = SIGN(pu1_src[col] - pu1_src[col - src_strd]);

        }

    }

    else

    {

        for(col = 0; col < wd; col++)

        {

            au1_sign_up[col] = SIGN(pu1_src[col] - pu1_src_top[col]);

        }

    }

    if(0 == pu1_avail[3])

    {

        ht--;

    }

    /* Processing is done on the intermediate buffer and the output is written to the source buffer */

    {

        for(row = 0; row < ht; row++)

        {

            for(col = 0; col < wd; col++)

            {

                WORD32 edge_idx;

                u1_sign_down = SIGN(pu1_src[col] - pu1_src[col + src_strd]);

                edge_idx = 2 + au1_sign_up[col] + u1_sign_down;

                au1_sign_up[col] = -u1_sign_down;

                edge_idx = gi4_ihevc_table_edge_idx[edge_idx] & au1_mask[col];

                if(0 != edge_idx)

                {

                    pu1_src[col] = CLIP3(pu1_src[col] + pi1_sao_offset[edge_idx], 0, (1 << bit_depth) - 1);

                }

            }

            pu1_src += src_strd;

        }

    }

    for(col = 0; col < wd; col++)

    {

        pu1_src_top[col] = au1_src_top_tmp[col];

    }

}

/* input 'wd' has to be for the interleaved block and not for each color component */

void ihevc_sao_edge_offset_class1_chroma(UWORD8 *pu1_src,

                                         WORD32 src_strd,

                                         UWORD8 *pu1_src_left,

                                         UWORD8 *pu1_src_top,

                                         UWORD8 *pu1_src_top_left,

                                         UWORD8 *pu1_src_top_right,

                                         UWORD8 *pu1_src_bot_left,

                                         UWORD8 *pu1_avail,

                                         WORD8 *pi1_sao_offset_u,

                                         WORD8 *pi1_sao_offset_v,

                                         WORD32 wd,

                                         WORD32 ht)

{

    WORD32 row, col;

    UWORD8 au1_mask[MAX_CTB_SIZE];

    UWORD8 au1_src_top_tmp[MAX_CTB_SIZE];

    WORD8 au1_sign_up[MAX_CTB_SIZE];

    WORD8 u1_sign_down;

    WORD32 bit_depth;

    UNUSED(pu1_src_top_right);

    UNUSED(pu1_src_bot_left);

    bit_depth = BIT_DEPTH_CHROMA;

    /* Initialize the mask values */

    memset(au1_mask, 0xFF, MAX_CTB_SIZE);

    /* Update left, top and top-left arrays */

    pu1_src_top_left[0] = pu1_src_top[wd - 2];

    pu1_src_top_left[1] = pu1_src_top[wd - 1];

    for(row = 0; row < ht; row++)

    {

        pu1_src_left[2 * row] = pu1_src[row * src_strd + wd - 2];

        pu1_src_left[2 * row + 1] = pu1_src[row * src_strd + wd - 1];

    }

    for(col = 0; col < wd; col++)

    {

        au1_src_top_tmp[col] = pu1_src[(ht - 1) * src_strd + col];

    }

    /* Update height and source pointers based on the availability flags */

    if(0 == pu1_avail[2])

    {

        pu1_src += src_strd;

        ht--;

        for(col = 0; col < wd; col++)

        {

            au1_sign_up[col] = SIGN(pu1_src[col] - pu1_src[col - src_strd]);

        }

    }

    else

    {

        for(col = 0; col < wd; col++)

        {

            au1_sign_up[col] = SIGN(pu1_src[col] - pu1_src_top[col]);

        }

    }

    if(0 == pu1_avail[3])

    {

        ht--;

    }

    /* Processing is done on the intermediate buffer and the output is written to the source buffer */

    {

        for(row = 0; row < ht; row++)

        {

            for(col = 0; col < wd; col++)

            {

                WORD32 edge_idx;

                WORD8 *pi1_sao_offset;

                pi1_sao_offset = (0 == col % 2) ? pi1_sao_offset_u : pi1_sao_offset_v;

                u1_sign_down = SIGN(pu1_src[col] - pu1_src[col + src_strd]);

                edge_idx = 2 + au1_sign_up[col] + u1_sign_down;

                au1_sign_up[col] = -u1_sign_down;

                edge_idx = gi4_ihevc_table_edge_idx[edge_idx] & au1_mask[col >> 1];

                if(0 != edge_idx)

                {

                    pu1_src[col] = CLIP3(pu1_src[col] + pi1_sao_offset[edge_idx], 0, (1 << bit_depth) - 1);

                }

            }

            pu1_src += src_strd;

        }

    }

    for(col = 0; col < wd; col++)

    {

        pu1_src_top[col] = au1_src_top_tmp[col];

    }

}

/* 135 degree filtering */

void ihevc_sao_edge_offset_class2(UWORD8 *pu1_src,

                                  WORD32 src_strd,

                                  UWORD8 *pu1_src_left,

                                  UWORD8 *pu1_src_top,

                                  UWORD8 *pu1_src_top_left,

                                  UWORD8 *pu1_src_top_right,

                                  UWORD8 *pu1_src_bot_left,

                                  UWORD8 *pu1_avail,

                                  WORD8 *pi1_sao_offset,

                                  WORD32 wd,

                                  WORD32 ht)

{

    WORD32 row, col;

    UWORD8 au1_mask[MAX_CTB_SIZE];

    UWORD8 au1_src_left_tmp[MAX_CTB_SIZE], au1_src_top_tmp[MAX_CTB_SIZE];

    UWORD8 u1_src_top_left_tmp;

    WORD8 au1_sign_up[MAX_CTB_SIZE + 1], au1_sign_up_tmp[MAX_CTB_SIZE + 1];

    WORD8 u1_sign_down;

    WORD8 *pu1_sign_up;

    WORD8 *pu1_sign_up_tmp;

    UWORD8 *pu1_src_left_cpy;

    WORD32 bit_depth;

    UWORD8 u1_pos_0_0_tmp;

    UWORD8 u1_pos_wd_ht_tmp;

    UNUSED(pu1_src_top_right);

    UNUSED(pu1_src_bot_left);

    bit_depth = BIT_DEPTH_LUMA;

    pu1_sign_up = au1_sign_up;

    pu1_sign_up_tmp = au1_sign_up_tmp;

    pu1_src_left_cpy = pu1_src_left;

    /* Initialize the mask values */

    memset(au1_mask, 0xFF, MAX_CTB_SIZE);

    /* Update left, top and top-left arrays */

    u1_src_top_left_tmp = pu1_src_top[wd - 1];

    for(row = 0; row < ht; row++)

    {

        au1_src_left_tmp[row] = pu1_src[row * src_strd + wd - 1];

    }

    for(col = 0; col < wd; col++)

    {

        au1_src_top_tmp[col] = pu1_src[(ht - 1) * src_strd + col];

    }

    /* If top-left is available, process separately */

    if(0 != pu1_avail[4])

    {

        WORD32 edge_idx;

        edge_idx = 2 + SIGN(pu1_src[0] - pu1_src_top_left[0]) +

                        SIGN(pu1_src[0] - pu1_src[1 + src_strd]);

        edge_idx = gi4_ihevc_table_edge_idx[edge_idx];

        if(0 != edge_idx)

        {

            u1_pos_0_0_tmp = CLIP3(pu1_src[0] + pi1_sao_offset[edge_idx], 0, (1 << bit_depth) - 1);

        }

        else

        {

            u1_pos_0_0_tmp = pu1_src[0];

        }

    }

    else

    {

        u1_pos_0_0_tmp = pu1_src[0];

    }

    /* If bottom-right is available, process separately */

    if(0 != pu1_avail[7])

    {

        WORD32 edge_idx;

        edge_idx = 2 + SIGN(pu1_src[wd - 1 + (ht - 1) * src_strd] - pu1_src[wd - 1 + (ht - 1) * src_strd - 1 - src_strd]) +

                        SIGN(pu1_src[wd - 1 + (ht - 1) * src_strd] - pu1_src[wd - 1 + (ht - 1) * src_strd + 1 + src_strd]);

        edge_idx = gi4_ihevc_table_edge_idx[edge_idx];

        if(0 != edge_idx)

        {

            u1_pos_wd_ht_tmp = CLIP3(pu1_src[wd - 1 + (ht - 1) * src_strd] + pi1_sao_offset[edge_idx], 0, (1 << bit_depth) - 1);

        }

        else

        {

            u1_pos_wd_ht_tmp = pu1_src[wd - 1 + (ht - 1) * src_strd];

        }

    }

    else

    {

        u1_pos_wd_ht_tmp = pu1_src[wd - 1 + (ht - 1) * src_strd];

    }

    /* If Left is not available */

    if(0 == pu1_avail[0])

    {

        au1_mask[0] = 0;

    }

    /* If Top is not available */

    if(0 == pu1_avail[2])

    {

        pu1_src += src_strd;

        ht--;

        pu1_src_left_cpy += 1;

        for(col = 1; col < wd; col++)

        {

            pu1_sign_up[col] = SIGN(pu1_src[col] - pu1_src[col - 1 - src_strd]);

        }

    }

    else

    {

        for(col = 1; col < wd; col++)

        {

            pu1_sign_up[col] = SIGN(pu1_src[col] - pu1_src_top[col - 1]);

        }

    }

    /* If Right is not available */

    if(0 == pu1_avail[1])

    {

        au1_mask[wd - 1] = 0;

    }

    /* If Bottom is not available */

    if(0 == pu1_avail[3])

    {

        ht--;

    }

    /* Processing is done on the intermediate buffer and the output is written to the source buffer */

    {

        for(row = 0; row < ht; row++)

        {

            pu1_sign_up[0] = SIGN(pu1_src[0] - pu1_src_left_cpy[row - 1]);

            for(col = 0; col < wd; col++)

            {

                WORD32 edge_idx;

                u1_sign_down = SIGN(pu1_src[col] - pu1_src[col + 1 + src_strd]);

                edge_idx = 2 + pu1_sign_up[col] + u1_sign_down;

                pu1_sign_up_tmp[col + 1] = -u1_sign_down;

                edge_idx = gi4_ihevc_table_edge_idx[edge_idx] & au1_mask[col];

                if(0 != edge_idx)

                {

                    pu1_src[col] = CLIP3(pu1_src[col] + pi1_sao_offset[edge_idx], 0, (1 << bit_depth) - 1);

                }

            }

            /* Swapping pu1_sign_up_tmp and pu1_sign_up */

            {

                WORD8 *pu1_swap_tmp = pu1_sign_up;

                pu1_sign_up = pu1_sign_up_tmp;

                pu1_sign_up_tmp = pu1_swap_tmp;

            }

            pu1_src += src_strd;

        }

        pu1_src[-(pu1_avail[2] ? ht : ht + 1) * src_strd] = u1_pos_0_0_tmp;

        pu1_src[(pu1_avail[3] ? wd - 1 - src_strd : wd - 1)] = u1_pos_wd_ht_tmp;

    }

    if(0 == pu1_avail[2])

        ht++;

    if(0 == pu1_avail[3])

        ht++;

    *pu1_src_top_left = u1_src_top_left_tmp;

    for(row = 0; row < ht; row++)

    {

        pu1_src_left[row] = au1_src_left_tmp[row];

    }

    for(col = 0; col < wd; col++)

    {

        pu1_src_top[col] = au1_src_top_tmp[col];

    }

}

/* 135 degree filtering */

void ihevc_sao_edge_offset_class2_chroma(UWORD8 *pu1_src,

                                         WORD32 src_strd,

                                         UWORD8 *pu1_src_left,

                                         UWORD8 *pu1_src_top,

                                         UWORD8 *pu1_src_top_left,

                                         UWORD8 *pu1_src_top_right,

                                         UWORD8 *pu1_src_bot_left,

                                         UWORD8 *pu1_avail,

                                         WORD8 *pi1_sao_offset_u,

                                         WORD8 *pi1_sao_offset_v,

                                         WORD32 wd,

                                         WORD32 ht)

{

    WORD32 row, col;

    UWORD8 au1_mask[MAX_CTB_SIZE];

    UWORD8 au1_src_left_tmp[2 * MAX_CTB_SIZE], au1_src_top_tmp[MAX_CTB_SIZE];

    UWORD8 au1_src_top_left_tmp[2];

    WORD8 au1_sign_up[MAX_CTB_SIZE + 2], au1_sign_up_tmp[MAX_CTB_SIZE + 2];

    WORD8 u1_sign_down;

    WORD8 *pu1_sign_up;

    WORD8 *pu1_sign_up_tmp;

    UWORD8 *pu1_src_left_cpy;

    WORD32 bit_depth;

    UWORD8 u1_pos_0_0_tmp_u;

    UWORD8 u1_pos_0_0_tmp_v;

    UWORD8 u1_pos_wd_ht_tmp_u;

    UWORD8 u1_pos_wd_ht_tmp_v;

    UNUSED(pu1_src_top_right);

    UNUSED(pu1_src_bot_left);

    bit_depth = BIT_DEPTH_CHROMA;

    pu1_sign_up = au1_sign_up;

    pu1_sign_up_tmp = au1_sign_up_tmp;

    pu1_src_left_cpy = pu1_src_left;

    /* Initialize the mask values */

    memset(au1_mask, 0xFF, MAX_CTB_SIZE);

    /* Update left, top and top-left arrays */

    au1_src_top_left_tmp[0] = pu1_src_top[wd - 2];

    au1_src_top_left_tmp[1] = pu1_src_top[wd - 1];

    for(row = 0; row < ht; row++)

    {

        au1_src_left_tmp[2 * row] = pu1_src[row * src_strd + wd - 2];

        au1_src_left_tmp[2 * row + 1] = pu1_src[row * src_strd + wd - 1];

    }

    for(col = 0; col < wd; col++)

    {

        au1_src_top_tmp[col] = pu1_src[(ht - 1) * src_strd + col];

    }

    /* If top-left is available, process separately */

    if(0 != pu1_avail[4])

    {

        WORD32 edge_idx;

        /* U */

        edge_idx = 2 + SIGN(pu1_src[0] - pu1_src_top_left[0]) +

                        SIGN(pu1_src[0] - pu1_src[2 + src_strd]);

        edge_idx = gi4_ihevc_table_edge_idx[edge_idx];

        if(0 != edge_idx)

        {

            u1_pos_0_0_tmp_u = CLIP3(pu1_src[0] + pi1_sao_offset_u[edge_idx], 0, (1 << bit_depth) - 1);

        }

        else

        {

            u1_pos_0_0_tmp_u = pu1_src[0];

        }

        /* V */

        edge_idx = 2 + SIGN(pu1_src[1] - pu1_src_top_left[1]) +

                        SIGN(pu1_src[1] - pu1_src[1 + 2 + src_strd]);

        edge_idx = gi4_ihevc_table_edge_idx[edge_idx];

        if(0 != edge_idx)

        {

            u1_pos_0_0_tmp_v = CLIP3(pu1_src[1] + pi1_sao_offset_v[edge_idx], 0, (1 << bit_depth) - 1);

        }

        else

        {

            u1_pos_0_0_tmp_v = pu1_src[1];

        }

    }

    else

    {

        u1_pos_0_0_tmp_u = pu1_src[0];

        u1_pos_0_0_tmp_v = pu1_src[1];

    }

    /* If bottom-right is available, process separately */

    if(0 != pu1_avail[7])

    {

        WORD32 edge_idx;

        /* U */

        edge_idx = 2 + SIGN(pu1_src[wd - 2 + (ht - 1) * src_strd] - pu1_src[wd - 2 + (ht - 1) * src_strd - 2 - src_strd]) +

                        SIGN(pu1_src[wd - 2 + (ht - 1) * src_strd] - pu1_src[wd - 2 + (ht - 1) * src_strd + 2 + src_strd]);

        edge_idx = gi4_ihevc_table_edge_idx[edge_idx];

        if(0 != edge_idx)

        {

            u1_pos_wd_ht_tmp_u = CLIP3(pu1_src[wd - 2 + (ht - 1) * src_strd] + pi1_sao_offset_u[edge_idx], 0, (1 << bit_depth) - 1);

        }

        else

        {

            u1_pos_wd_ht_tmp_u = pu1_src[wd - 2 + (ht - 1) * src_strd];

        }

        /* V */

        edge_idx = 2 + SIGN(pu1_src[wd - 1 + (ht - 1) * src_strd] - pu1_src[wd - 1 + (ht - 1) * src_strd - 2 - src_strd]) +

                        SIGN(pu1_src[wd - 1 + (ht - 1) * src_strd] - pu1_src[wd - 1 + (ht - 1) * src_strd + 2 + src_strd]);

        edge_idx = gi4_ihevc_table_edge_idx[edge_idx];

        if(0 != edge_idx)

        {

            u1_pos_wd_ht_tmp_v = CLIP3(pu1_src[wd - 1 + (ht - 1) * src_strd] + pi1_sao_offset_v[edge_idx], 0, (1 << bit_depth) - 1);

        }

        else

        {

            u1_pos_wd_ht_tmp_v = pu1_src[wd - 1 + (ht - 1) * src_strd];

        }

    }

    else

    {

        u1_pos_wd_ht_tmp_u = pu1_src[wd - 2 + (ht - 1) * src_strd];

        u1_pos_wd_ht_tmp_v = pu1_src[wd - 1 + (ht - 1) * src_strd];

    }

    /* If Left is not available */

    if(0 == pu1_avail[0])

    {

        au1_mask[0] = 0;

    }

    /* If Top is not available */

    if(0 == pu1_avail[2])

    {

        pu1_src += src_strd;

        pu1_src_left_cpy += 2;

        ht--;

        for(col = 2; col < wd; col++)

        {

            pu1_sign_up[col] = SIGN(pu1_src[col] - pu1_src[col - 2 - src_strd]);

        }

    }

    else

    {

        for(col = 2; col < wd; col++)

        {

            pu1_sign_up[col] = SIGN(pu1_src[col] - pu1_src_top[col - 2]);

        }

    }

    /* If Right is not available */

    if(0 == pu1_avail[1])

    {

        au1_mask[(wd - 1) >> 1] = 0;

    }

    /* If Bottom is not available */

    if(0 == pu1_avail[3])

    {

        ht--;

    }

    /* Processing is done on the intermediate buffer and the output is written to the source buffer */

    {

        for(row = 0; row < ht; row++)

        {

            pu1_sign_up[0] = SIGN(pu1_src[0] - pu1_src_left_cpy[2 * (row - 1)]);

            pu1_sign_up[1] = SIGN(pu1_src[1] - pu1_src_left_cpy[2 * (row - 1) + 1]);

            for(col = 0; col < wd; col++)

            {

                WORD32 edge_idx;

                WORD8 *pi1_sao_offset;

                pi1_sao_offset = (0 == col % 2) ? pi1_sao_offset_u : pi1_sao_offset_v;

                u1_sign_down = SIGN(pu1_src[col] - pu1_src[col + 2 + src_strd]);

                edge_idx = 2 + pu1_sign_up[col] + u1_sign_down;

                pu1_sign_up_tmp[col + 2] = -u1_sign_down;

                edge_idx = gi4_ihevc_table_edge_idx[edge_idx] & au1_mask[col >> 1];

                if(0 != edge_idx)

                {

                    pu1_src[col] = CLIP3(pu1_src[col] + pi1_sao_offset[edge_idx], 0, (1 << bit_depth) - 1);

                }

            }

            /* Swapping pu1_sign_up_tmp and pu1_sign_up */

            {

                WORD8 *pu1_swap_tmp = pu1_sign_up;

                pu1_sign_up = pu1_sign_up_tmp;

                pu1_sign_up_tmp = pu1_swap_tmp;

            }

            pu1_src += src_strd;

        }

        pu1_src[-(pu1_avail[2] ? ht : ht + 1) * src_strd] = u1_pos_0_0_tmp_u;

        pu1_src[-(pu1_avail[2] ? ht : ht + 1) * src_strd + 1] = u1_pos_0_0_tmp_v;

        pu1_src[(pu1_avail[3] ? wd - 2 - src_strd : wd - 2)] = u1_pos_wd_ht_tmp_u;

        pu1_src[(pu1_avail[3] ? wd - 1 - src_strd : wd - 1)] = u1_pos_wd_ht_tmp_v;

    }

    if(0 == pu1_avail[2])

        ht++;

    if(0 == pu1_avail[3])

        ht++;

    pu1_src_top_left[0] = au1_src_top_left_tmp[0];

    pu1_src_top_left[1] = au1_src_top_left_tmp[1];

    for(row = 0; row < 2 * ht; row++)

    {

        pu1_src_left[row] = au1_src_left_tmp[row];

    }

    for(col = 0; col < wd; col++)

    {

        pu1_src_top[col] = au1_src_top_tmp[col];

    }

}

/* 45 degree filtering */

void ihevc_sao_edge_offset_class3(UWORD8 *pu1_src,

                                  WORD32 src_strd,

                                  UWORD8 *pu1_src_left,

                                  UWORD8 *pu1_src_top,

                                  UWORD8 *pu1_src_top_left,

                                  UWORD8 *pu1_src_top_right,

                                  UWORD8 *pu1_src_bot_left,

                                  UWORD8 *pu1_avail,

                                  WORD8 *pi1_sao_offset,

                                  WORD32 wd,

                                  WORD32 ht)

{

    WORD32 row, col;

    UWORD8 au1_mask[MAX_CTB_SIZE];

    UWORD8 au1_src_top_tmp[MAX_CTB_SIZE];

    UWORD8 au1_src_left_tmp[MAX_CTB_SIZE];

    UWORD8 u1_src_top_left_tmp;

    WORD8 au1_sign_up[MAX_CTB_SIZE];

    UWORD8 *pu1_src_left_cpy;

    WORD8 u1_sign_down;

    WORD32 bit_depth;

    UWORD8 u1_pos_0_ht_tmp;

    UWORD8 u1_pos_wd_0_tmp;

    bit_depth = BIT_DEPTH_LUMA;

    pu1_src_left_cpy = pu1_src_left;

    /* Initialize the mask values */

    memset(au1_mask, 0xFF, MAX_CTB_SIZE);

    /* Update left, top and top-left arrays */

    u1_src_top_left_tmp = pu1_src_top[wd - 1];

    for(row = 0; row < ht; row++)

    {

        au1_src_left_tmp[row] = pu1_src[row * src_strd + wd - 1];

    }

    for(col = 0; col < wd; col++)

    {

        au1_src_top_tmp[col] = pu1_src[(ht - 1) * src_strd + col];

    }

    /* If top-right is available, process separately */

    if(0 != pu1_avail[5])

    {

        WORD32 edge_idx;

        edge_idx = 2 + SIGN(pu1_src[wd - 1] - pu1_src_top_right[0]) +

                        SIGN(pu1_src[wd - 1] - pu1_src[wd - 1 - 1 + src_strd]);

        edge_idx = gi4_ihevc_table_edge_idx[edge_idx];

        if(0 != edge_idx)

        {

            u1_pos_wd_0_tmp = CLIP3(pu1_src[wd - 1] + pi1_sao_offset[edge_idx], 0, (1 << bit_depth) - 1);

        }

        else

        {

            u1_pos_wd_0_tmp = pu1_src[wd - 1];

        }

    }

    else

    {