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

 *

 * 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

 *  ihevcd_mv_pred.c

 *

 * @brief

 *  Contains functions for motion vector prediction

 *

 * @author

 *  Ittiam

 *

 * @par List of Functions:

 * - ihevcd_mvp_spatial_cand()

 *

 * @remarks

 *  None

 *

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

 */

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

/* 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_macros.h"

#include "ihevc_debug.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_common_tables.h"

#include "ihevce_defs.h"

#include "ihevce_hle_interface.h"

#include "ihevce_lap_enc_structs.h"

#include "ihevce_multi_thrd_structs.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_entropy_structs.h"

#include "ihevce_cmn_utils_instr_set_router.h"

#include "ihevce_enc_loop_structs.h"

#include "hme_datatype.h"

#include "hme_interface.h"

#include "hme_common_defs.h"

#include "hme_defs.h"

#include "ihevce_mv_pred.h"

#include "ihevce_mv_pred_merge.h"

#include "ihevce_common_utils.h"

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

/* Function Definitions                                                      */

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

/**

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

 *

 * @brief

 * This function performs Motion Vector prediction and return a list of mv

 *

 * @par Description:

 *  MV predictor list is computed using neighbor mvs and colocated mv

 *

 * @param[in] ps_ctxt

 * pointer to mv predictor context

 *

 * @param[in] ps_top_nbr_4x4

 * pointer to top 4x4 nbr structure

 *

 * @param[in] ps_left_nbr_4x4

 * pointer to left 4x4 nbr structure

 *

 * @param[in] ps_top_left_nbr_4x4

 * pointer to top left 4x4 nbr structure

 *

 * @param[in] left_nbr_4x4_strd

 * left nbr buffer stride in terms of 4x4 units

 *

 * @param[in] ps_avail_flags

 * Neighbor availability flags container

 *

 * @param[in] ps_col_mv

 * Colocated MV pointer

 *

 * @param[in] ps_pu

 * Current Partition PU strucrture pointer

 *

 * @param[inout] ps_pred_mv

 * pointer to store predicted MV list

 *

 * @returns

 * None

 * @remarks

 *

 *

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

 */

void ihevce_mv_pred(

    mv_pred_ctxt_t *ps_ctxt,

    nbr_4x4_t *ps_top_nbr_4x4,

    nbr_4x4_t *ps_left_nbr_4x4,

    nbr_4x4_t *ps_top_left_nbr_4x4,

    WORD32 left_nbr_4x4_strd,

    nbr_avail_flags_t *ps_avail_flags,

    pu_mv_t *ps_col_mv,

    pu_t *ps_pu,

    pu_mv_t *ps_pred_mv,

    UWORD8 (*pau1_is_top_used)[MAX_MVP_LIST_CAND])

{

    WORD32 is_scaled_flag_list[2] /* Indicates whether A0 or A1 is available */;

    WORD32 lb_avail, l_avail, t_avail, tr_avail, tl_avail;

    WORD32 avail_a_flag[2];

    WORD32 avail_b_flag[2];

    mv_t as_mv_a[2];

    mv_t as_mv_b[2];

    UWORD8 i1_cur_ref_idx_list[2];

    WORD32 part_pos_x;

    WORD32 part_pos_y;

    WORD32 part_wd;

    WORD32 part_ht;

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

    /* Neighbor location: Graphical indication */

    /*                                         */

    /*          B2 _____________B1 B0          */

    /*            |               |            */

    /*            |               |            */

    /*            |               |            */

    /*            |      PU     ht|            */

    /*            |               |            */

    /*            |               |            */

    /*          A1|______wd_______|            */

    /*          A0                             */

    /*                                         */

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

    /* Initialization */

    avail_a_flag[0] = 0;

    avail_a_flag[1] = 0;

    avail_b_flag[0] = 0;

    avail_b_flag[1] = 0;

    as_mv_a[0].i2_mvx = 0;

    as_mv_a[0].i2_mvy = 0;

    as_mv_a[1].i2_mvx = 0;

    as_mv_a[1].i2_mvy = 0;

    as_mv_b[0].i2_mvx = 0;

    as_mv_b[0].i2_mvy = 0;

    as_mv_b[1].i2_mvx = 0;

    as_mv_b[1].i2_mvy = 0;

    lb_avail = ps_avail_flags->u1_bot_lt_avail;

    l_avail = ps_avail_flags->u1_left_avail;

    tr_avail = ps_avail_flags->u1_top_rt_avail;

    t_avail = ps_avail_flags->u1_top_avail;

    tl_avail = ps_avail_flags->u1_top_lt_avail;

    is_scaled_flag_list[0] = 0;

    is_scaled_flag_list[1] = 0;

    part_pos_x = ps_pu->b4_pos_x << 2;

    part_pos_y = ps_pu->b4_pos_y << 2;

    part_wd = (ps_pu->b4_wd + 1) << 2;

    part_ht = (ps_pu->b4_ht + 1) << 2;

    /* Initializing current PU reference index     */

    /* if -1 is set then that direction is invalid */

    i1_cur_ref_idx_list[0] = (-1 == ps_pu->mv.i1_l0_ref_idx) ? 0 : ps_pu->mv.i1_l0_ref_idx;

    i1_cur_ref_idx_list[1] = (-1 == ps_pu->mv.i1_l1_ref_idx) ? 0 : ps_pu->mv.i1_l1_ref_idx;

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

    /* Calculating of motion vector A from neighbors A0 and A1  */

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

    {

        WORD32 l_x, a;

        WORD32 *pi4_avail_flag;

        WORD32 nbr_avail[2]; /*[A0/A1] */

        WORD8 i1_nbr_ref_idx_list[2][2]; /* [A0/A1][L0/L1] */

        UWORD8 u1_nbr_intra_flag[2]; /*[A0/A1] */

        UWORD8 u1_nbr_pred_flag[2][2]; /* [A0/A1][L0/L1] */

        mv_t *ps_mv;

        nbr_4x4_t *ps_a0, *ps_a1;

        mv_t *ps_nbr_mv[2][2]; /* [A0/A1][L0/L1] */

        /* A0 and A1 initializations */

        ps_mv = &as_mv_a[0];

        pi4_avail_flag = avail_a_flag;

        /* Pointers to A0 and A1 */

        {

            WORD32 y_a0, y_a1;

            /* TODO: y_a0, y_a1 is coded assuming left nbr pointer starts at PU */

            y_a0 = (part_ht >> 2);

            y_a1 = ((part_ht - 1) >> 2);

            ps_a0 = ps_left_nbr_4x4 + (y_a0 * left_nbr_4x4_strd);

            ps_a1 = ps_left_nbr_4x4 + (y_a1 * left_nbr_4x4_strd);

        }

        nbr_avail[0] = lb_avail && (!ps_a0->b1_intra_flag);

        nbr_avail[1] = l_avail && (!ps_a1->b1_intra_flag);

        /* Setting is scaled flag based on availability of A0 and A1 */

        if((nbr_avail[0] == 1) || (nbr_avail[1]))

        {

            is_scaled_flag_list[0] = 1;

            is_scaled_flag_list[1] = 1;

        }

        /* Initializing A0 variables */

        ps_nbr_mv[0][0] = &ps_a0->mv.s_l0_mv;

        ps_nbr_mv[0][1] = &ps_a0->mv.s_l1_mv;

        i1_nbr_ref_idx_list[0][0] = ps_a0->mv.i1_l0_ref_idx;

        i1_nbr_ref_idx_list[0][1] = ps_a0->mv.i1_l1_ref_idx;

        u1_nbr_pred_flag[0][0] = (UWORD8)ps_a0->b1_pred_l0_flag;

        u1_nbr_pred_flag[0][1] = (UWORD8)ps_a0->b1_pred_l1_flag;

        u1_nbr_intra_flag[0] = (UWORD8)ps_a0->b1_intra_flag;

        /* Initializing A1 variables */

        ps_nbr_mv[1][0] = &ps_a1->mv.s_l0_mv;

        ps_nbr_mv[1][1] = &ps_a1->mv.s_l1_mv;

        i1_nbr_ref_idx_list[1][0] = ps_a1->mv.i1_l0_ref_idx;

        i1_nbr_ref_idx_list[1][1] = ps_a1->mv.i1_l1_ref_idx;

        u1_nbr_pred_flag[1][0] = (UWORD8)ps_a1->b1_pred_l0_flag;

        u1_nbr_pred_flag[1][1] = (UWORD8)ps_a1->b1_pred_l1_flag;

        u1_nbr_intra_flag[1] = (UWORD8)ps_a1->b1_intra_flag;

        /* Derivation of mvL0A and mvL1A from A0 and A1 */

        for(l_x = 0; l_x < 2; l_x++) /* list 0 and list 1 */

        {

            WORD32 l_y;

            l_y = !l_x; /* if i=0, y = L1 else y = L0 */

            for(a = 0; a < 2; a++)

            {

                /* MODE_INTRA check has been taken care in availability check */

                if((nbr_avail[a] == 1) && (pi4_avail_flag[l_x] == 0))

                {

                    if(u1_nbr_pred_flag[a][l_x] == 1)

                    {

                        WORD32 nbr_ref_poc, cur_ref_poc;

                        WORD8 i1_cur_ref_idx, i1_nbr_ref_idx;

                        i1_cur_ref_idx = i1_cur_ref_idx_list[l_x];

                        cur_ref_poc = ps_ctxt->ps_ref_list[l_x][i1_cur_ref_idx]->i4_poc;

                        i1_nbr_ref_idx = i1_nbr_ref_idx_list[a][l_x];

                        nbr_ref_poc = ps_ctxt->ps_ref_list[l_x][i1_nbr_ref_idx]->i4_poc;

                        if(nbr_ref_poc == cur_ref_poc)

                        {

                            pi4_avail_flag[l_x] = 1;

                            ps_mv[l_x] = *ps_nbr_mv[a][l_x];

                            break;

                        }

                    }

                    if(u1_nbr_pred_flag[a][l_y] == 1)

                    {

                        WORD32 nbr_ref_poc, cur_ref_poc;

                        WORD8 i1_nbr_ref_idx, i1_cur_ref_idx;

                        i1_cur_ref_idx = i1_cur_ref_idx_list[l_x];

                        cur_ref_poc = ps_ctxt->ps_ref_list[l_x][i1_cur_ref_idx]->i4_poc;

                        i1_nbr_ref_idx = i1_nbr_ref_idx_list[a][l_y];

                        nbr_ref_poc = ps_ctxt->ps_ref_list[l_y][i1_nbr_ref_idx]->i4_poc;

                        if(nbr_ref_poc == cur_ref_poc)

                        {

                            pi4_avail_flag[l_x] = 1;

                            ps_mv[l_x] = *ps_nbr_mv[a][l_y];

                            break;

                        }

                    }

                }

            }

        }

        for(l_x = 0; l_x < 2; l_x++) /* list 0 and list 1 */

        {

            if(pi4_avail_flag[l_x] == 0)

            {

                WORD8 i1_nbr_ref_list_idx, i1_nbr_ref_idx;

                WORD32 l_y;

                l_y = !l_x; /* if i=0, y = L1 else y = L0 */

                for(a = 0; a < 2; a++)

                {

                    /* MODE_INTRA check has been taken care in availability check */

                    if((nbr_avail[a] == 1) && (pi4_avail_flag[l_x] == 0))

                    {

                        /* Long term reference check Removed */

                        if(u1_nbr_pred_flag[a][l_x] == 1)

                        {

                            pi4_avail_flag[l_x] = 1;

                            ps_mv[l_x] = *ps_nbr_mv[a][l_x];

                            i1_nbr_ref_idx = i1_nbr_ref_idx_list[a][l_x];

                            i1_nbr_ref_list_idx = l_x;

                            break;

                        }

                        /* Long term reference check Removed */

                        else if(u1_nbr_pred_flag[a][l_y] == 1)

                        {

                            pi4_avail_flag[l_x] = 1;

                            ps_mv[l_x] = *ps_nbr_mv[a][l_y];

                            i1_nbr_ref_idx = i1_nbr_ref_idx_list[a][l_y];

                            i1_nbr_ref_list_idx = l_y;

                            break;

                        }

                    }

                }

                /* Long term reference check Removed */

                if(pi4_avail_flag[l_x] == 1)

                {

                    WORD8 i1_cur_ref_idx;

                    WORD32 cur_ref_poc, nbr_ref_poc;

                    WORD32 cur_poc;

                    i1_cur_ref_idx = i1_cur_ref_idx_list[l_x];

                    cur_ref_poc = ps_ctxt->ps_ref_list[l_x][i1_cur_ref_idx]->i4_poc;

                    nbr_ref_poc = ps_ctxt->ps_ref_list[i1_nbr_ref_list_idx][i1_nbr_ref_idx]->i4_poc;

                    cur_poc = ps_ctxt->ps_slice_hdr->i4_abs_pic_order_cnt;

                    ihevce_scale_mv(&ps_mv[l_x], cur_ref_poc, nbr_ref_poc, cur_poc);

                }

            }

        }

    }

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

    /* Calculating of motion vector B from neighbors B0 and B1  */

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

    {

        WORD32 l_x, b;

        WORD32 *pi4_avail_flag;

        WORD32 nbr_avail[3]; /* [B0/B1/B2] */

        WORD8 i1_nbr_ref_idx_list[3][2]; /* [B0/B1/B2][L0/L1] */

        UWORD8 u1_nbr_intra_flag[3]; /*[B0/B1/B2] */

        UWORD8 u1_nbr_pred_flag[3][2]; /* [B0/B1/B2][L0/L1] */

        mv_t *ps_mv;

        nbr_4x4_t *ps_b0, *ps_b1, *ps_b2;

        mv_t *ps_nbr_mv[3][2]; /* [B0/B1/B2][L0/L1] */

        /* B0, B1 and B2 initializations */

        ps_mv = &as_mv_b[0];

        pi4_avail_flag = avail_b_flag;

        /* Pointers to B0, B1 and B2 */

        {

            WORD32 x_b0, x_b1, x_b2;

            /* Relative co-ordiante of Xp,Yp w.r.t CTB start will work */

            /* as long as minCTB = 16                                  */

            x_b0 = (part_pos_x + part_wd);

            x_b1 = (part_pos_x + part_wd - 1);

            x_b2 = (part_pos_x - 1);

            /* Getting offset back to given pointer */

            x_b0 = x_b0 - part_pos_x;

            x_b1 = x_b1 - part_pos_x;

            x_b2 = x_b2 - part_pos_x;

            /* Below derivation are based on top pointer */

            /* is pointing first pixel of PU             */

            ps_b0 = ps_top_nbr_4x4 + (x_b0 >> 2);

            ps_b1 = ps_top_nbr_4x4 + (x_b1 >> 2);

            /* At CTB boundary, use top-left passed in */

            if(part_pos_y)

            {

                ps_b2 = ps_top_left_nbr_4x4;

            }

            else

            {

                /* Not at CTB boundary, use top and  */

                /* add correction to go to top-left */

                ps_b2 = (ps_top_nbr_4x4) + (x_b2 >> 2);

            }

        }

        nbr_avail[0] = tr_avail && (!ps_b0->b1_intra_flag);

        nbr_avail[1] = t_avail && (!ps_b1->b1_intra_flag);

        nbr_avail[2] = tl_avail && (!ps_b2->b1_intra_flag);

        /* Initializing B0 related variables */

        ps_nbr_mv[0][0] = &ps_b0->mv.s_l0_mv;

        ps_nbr_mv[0][1] = &ps_b0->mv.s_l1_mv;

        i1_nbr_ref_idx_list[0][0] = ps_b0->mv.i1_l0_ref_idx;

        i1_nbr_ref_idx_list[0][1] = ps_b0->mv.i1_l1_ref_idx;

        u1_nbr_pred_flag[0][0] = (UWORD8)ps_b0->b1_pred_l0_flag;

        u1_nbr_pred_flag[0][1] = (UWORD8)ps_b0->b1_pred_l1_flag;

        u1_nbr_intra_flag[0] = (UWORD8)ps_b0->b1_intra_flag;

        /* Initializing B1 related variables */

        ps_nbr_mv[1][0] = &ps_b1->mv.s_l0_mv;

        ps_nbr_mv[1][1] = &ps_b1->mv.s_l1_mv;

        i1_nbr_ref_idx_list[1][0] = ps_b1->mv.i1_l0_ref_idx;

        i1_nbr_ref_idx_list[1][1] = ps_b1->mv.i1_l1_ref_idx;

        u1_nbr_pred_flag[1][0] = (UWORD8)ps_b1->b1_pred_l0_flag;

        u1_nbr_pred_flag[1][1] = (UWORD8)ps_b1->b1_pred_l1_flag;

        u1_nbr_intra_flag[1] = (UWORD8)ps_b1->b1_intra_flag;

        /* Initializing B2 related variables */

        ps_nbr_mv[2][0] = &ps_b2->mv.s_l0_mv;

        ps_nbr_mv[2][1] = &ps_b2->mv.s_l1_mv;

        i1_nbr_ref_idx_list[2][0] = ps_b2->mv.i1_l0_ref_idx;

        i1_nbr_ref_idx_list[2][1] = ps_b2->mv.i1_l1_ref_idx;

        u1_nbr_pred_flag[2][0] = (UWORD8)ps_b2->b1_pred_l0_flag;

        u1_nbr_pred_flag[2][1] = (UWORD8)ps_b2->b1_pred_l1_flag;

        u1_nbr_intra_flag[2] = (UWORD8)ps_b2->b1_intra_flag;

        /* Derivation of mvL0B and mvL1B from B0,B1 and B2 */

        for(l_x = 0; l_x < 2; l_x++) /* list 0 and list 1 */

        {

            WORD32 l_y;

            l_y = !l_x; /* if i=0, y = L1 else y = L0 */

            for(b = 0; b < 3; b++)

            {

                if((nbr_avail[b] == 1) && (pi4_avail_flag[l_x] == 0))

                {

                    if(u1_nbr_pred_flag[b][l_x] == 1)

                    {

                        WORD32 nbr_ref_poc, cur_ref_poc;

                        WORD8 i1_cur_ref_idx, i1_nbr_ref_idx;

                        i1_cur_ref_idx = i1_cur_ref_idx_list[l_x];

                        cur_ref_poc = ps_ctxt->ps_ref_list[l_x][i1_cur_ref_idx]->i4_poc;

                        i1_nbr_ref_idx = i1_nbr_ref_idx_list[b][l_x];

                        nbr_ref_poc = ps_ctxt->ps_ref_list[l_x][i1_nbr_ref_idx]->i4_poc;

                        if(nbr_ref_poc == cur_ref_poc)

                        {

                            pi4_avail_flag[l_x] = 1;

                            ps_mv[l_x] = *ps_nbr_mv[b][l_x];

                            break;

                        }

                    }

                    if(u1_nbr_pred_flag[b][l_y] == 1)

                    {

                        WORD32 nbr_ref_poc, cur_ref_poc;

                        WORD8 i1_nbr_ref_idx, i1_cur_ref_idx;

                        i1_cur_ref_idx = i1_cur_ref_idx_list[l_x];

                        cur_ref_poc = ps_ctxt->ps_ref_list[l_x][i1_cur_ref_idx]->i4_poc;

                        i1_nbr_ref_idx = i1_nbr_ref_idx_list[b][l_y];

                        nbr_ref_poc = ps_ctxt->ps_ref_list[l_y][i1_nbr_ref_idx]->i4_poc;

                        if(nbr_ref_poc == cur_ref_poc)

                        {

                            pi4_avail_flag[l_x] = 1;

                            ps_mv[l_x] = *ps_nbr_mv[b][l_y];

                            break;

                        }

                    }

                }

            }

        }

        if((is_scaled_flag_list[0] == 0) && (avail_b_flag[0] == 1))

        {

            avail_a_flag[0] = 1;

            as_mv_a[0] = as_mv_b[0];

        }

        if((is_scaled_flag_list[1] == 0) && (avail_b_flag[1] == 1))

        {

            avail_a_flag[1] = 1;

            as_mv_a[1] = as_mv_b[1];

        }

        for(l_x = 0; l_x < 2; l_x++) /* list 0 and list 1 */

        {

            if(is_scaled_flag_list[l_x] == 0)

            {

                /* If isScaledFlagLX == 0, availFlagLXB flag is set to 0 */

                pi4_avail_flag[l_x] = 0;

                {

                    WORD8 i1_nbr_ref_list_idx, i1_nbr_ref_idx;

                    WORD32 l_y;

                    l_y = !l_x; /* if i=0, y = L1 else y = L0 */

                    for(b = 0; b < 3; b++)

                    {

                        if((nbr_avail[b] == 1) && (pi4_avail_flag[l_x] == 0))

                        {

                            /* Long term reference check Removed */

                            if(u1_nbr_pred_flag[b][l_x] == 1)

                            {

                                pi4_avail_flag[l_x] = 1;

                                ps_mv[l_x] = *ps_nbr_mv[b][l_x];

                                i1_nbr_ref_idx = i1_nbr_ref_idx_list[b][l_x];

                                i1_nbr_ref_list_idx = l_x;

                                break;

                            }

                            /* Long term reference check Removed */

                            else if(u1_nbr_pred_flag[b][l_y] == 1)

                            {

                                pi4_avail_flag[l_x] = 1;

                                ps_mv[l_x] = *ps_nbr_mv[b][l_y];

                                i1_nbr_ref_idx = i1_nbr_ref_idx_list[b][l_y];

                                i1_nbr_ref_list_idx = l_y;

                                break;

                            }

                        }

                    }

                    /* Long term reference check Removed */

                    if(pi4_avail_flag[l_x] == 1)

                    {

                        WORD8 i1_cur_ref_idx;

                        WORD32 cur_ref_poc, nbr_ref_poc;

                        WORD32 cur_poc;

                        i1_cur_ref_idx = i1_cur_ref_idx_list[l_x];

                        cur_ref_poc = ps_ctxt->ps_ref_list[l_x][i1_cur_ref_idx]->i4_poc;

                        nbr_ref_poc =

                            ps_ctxt->ps_ref_list[i1_nbr_ref_list_idx][i1_nbr_ref_idx]->i4_poc;

                        cur_poc = ps_ctxt->ps_slice_hdr->i4_abs_pic_order_cnt;

                        if(cur_ref_poc != nbr_ref_poc)

                            ihevce_scale_mv(&ps_mv[l_x], cur_ref_poc, nbr_ref_poc, cur_poc);

                    }

                }

            }

        }

    }

    /* Candidate list */

    {

        mv_t as_mvp_list_l0[MAX_MVP_LIST_CAND_MEM]; /*[Cand0/Cand1/Cand2] */

        mv_t as_mvp_list_l1[MAX_MVP_LIST_CAND_MEM]; /*[Cand0/Cand1/Cand2] */

        UWORD8 au1_is_top_used_l0[MAX_MVP_LIST_CAND_MEM];

        UWORD8 au1_is_top_used_l1[MAX_MVP_LIST_CAND_MEM];

        WORD32 num_mvp_cand_l0;

        WORD32 num_mvp_cand_l1;

        /* L0 candidate list*/

        num_mvp_cand_l0 = 0;

        if(avail_a_flag[0] == 1)

        {

            as_mvp_list_l0[num_mvp_cand_l0] = as_mv_a[0];

            au1_is_top_used_l0[num_mvp_cand_l0] = (is_scaled_flag_list[0] == 0);

            num_mvp_cand_l0++;

        }

        if(avail_b_flag[0] == 1)

        {

            if(((as_mv_a[0].i2_mvx != as_mv_b[0].i2_mvx) ||

                (as_mv_a[0].i2_mvy != as_mv_b[0].i2_mvy)) ||

               (0 == num_mvp_cand_l0))

            {

                as_mvp_list_l0[num_mvp_cand_l0] = as_mv_b[0];

                au1_is_top_used_l0[num_mvp_cand_l0] = 1;

                num_mvp_cand_l0++;

            }

        }

        /* L1 candidate list*/

        num_mvp_cand_l1 = 0;

        if(avail_a_flag[1] == 1)

        {

            as_mvp_list_l1[num_mvp_cand_l1] = as_mv_a[1];

            au1_is_top_used_l1[num_mvp_cand_l1] = (is_scaled_flag_list[1] == 0);

            num_mvp_cand_l1++;

        }

        if(avail_b_flag[1] == 1)

        {

            if(((as_mv_a[1].i2_mvx != as_mv_b[1].i2_mvx) ||

                (as_mv_a[1].i2_mvy != as_mv_b[1].i2_mvy)) ||

               (0 == num_mvp_cand_l1))

            {

                as_mvp_list_l1[num_mvp_cand_l1] = as_mv_b[1];

                au1_is_top_used_l1[num_mvp_cand_l1] = 1;

                num_mvp_cand_l1++;

            }

        }

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

        /*          Collocated MV prediction                       */

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

        if((MAX_MVP_LIST_CAND > num_mvp_cand_l0) || (MAX_MVP_LIST_CAND > num_mvp_cand_l1))

        {

            mv_t as_mv_col[2], s_mv_col_l0, s_mv_col_l1;

            WORD32 avail_col_flag[2] = { 0 };

            WORD32 x_col, y_col, avail_col_l0, avail_col_l1;

            x_col = part_pos_x + part_wd;

            y_col = part_pos_y + part_ht;

            ihevce_collocated_mvp(ps_ctxt, ps_pu, as_mv_col, avail_col_flag, 1, x_col, y_col);

            avail_col_l0 = avail_col_flag[0];

            avail_col_l1 = avail_col_flag[1];

            if(avail_col_l0 || avail_col_l1)

            {

                s_mv_col_l0 = as_mv_col[0];

                s_mv_col_l1 = as_mv_col[1];

            }

            if(avail_col_l0 == 0 || avail_col_l1 == 0)

            {

                /* Checking Collocated MV availability at Center of PU */

                x_col = part_pos_x + (part_wd >> 1);

                y_col = part_pos_y + (part_ht >> 1);

                ihevce_collocated_mvp(ps_ctxt, ps_pu, as_mv_col, avail_col_flag, 1, x_col, y_col);

                if(avail_col_l0 == 0)

                {

                    s_mv_col_l0 = as_mv_col[0];

                }

                if(avail_col_l1 == 0)

                {

                    s_mv_col_l1 = as_mv_col[1];

                }

                avail_col_l0 |= avail_col_flag[0];

                avail_col_l1 |= avail_col_flag[1];

            }

            /* Checking if mvp index matches collocated mv */

            if(avail_col_l0)

            {

                if(MAX_MVP_LIST_CAND > num_mvp_cand_l0)

                {

                    as_mvp_list_l0[num_mvp_cand_l0] = s_mv_col_l0;

                    au1_is_top_used_l0[num_mvp_cand_l0] = 0;

                    num_mvp_cand_l0++;

                }

            }

            if(avail_col_l1)

            {

                if(MAX_MVP_LIST_CAND > num_mvp_cand_l1)

                {

                    as_mvp_list_l1[num_mvp_cand_l1] = s_mv_col_l1;

                    au1_is_top_used_l1[num_mvp_cand_l1] = 0;

                    num_mvp_cand_l1++;

                }

            }

        }

        /* Adding zero if mv candidates are less than 2 */

        while(num_mvp_cand_l0 < MAX_MVP_LIST_CAND)

        {

            as_mvp_list_l0[num_mvp_cand_l0].i2_mvx = 0;

            as_mvp_list_l0[num_mvp_cand_l0].i2_mvy = 0;

            au1_is_top_used_l0[num_mvp_cand_l0] = 0;

            num_mvp_cand_l0++;

        };

        while(num_mvp_cand_l1 < MAX_MVP_LIST_CAND)

        {

            as_mvp_list_l1[num_mvp_cand_l1].i2_mvx = 0;

            as_mvp_list_l1[num_mvp_cand_l1].i2_mvy = 0;

            au1_is_top_used_l1[num_mvp_cand_l1] = 0;

            num_mvp_cand_l1++;

        };

        /* Removing mvs if candidates are greater than 2 */

        if(num_mvp_cand_l0 > MAX_MVP_LIST_CAND)

        {

            num_mvp_cand_l0 = MAX_MVP_LIST_CAND;

        };

        if(num_mvp_cand_l1 > MAX_MVP_LIST_CAND)

        {

            num_mvp_cand_l1 = MAX_MVP_LIST_CAND;

        };

        /* Copying list to output */

        {

            WORD32 i;

            for(i = 0; i < num_mvp_cand_l0; i++)

            {

                ps_pred_mv[i].s_l0_mv = as_mvp_list_l0[i];

                pau1_is_top_used[0][i] = au1_is_top_used_l0[i];

            }

            for(i = 0; i < num_mvp_cand_l1; i++)

            {

                ps_pred_mv[i].s_l1_mv = as_mvp_list_l1[i];

                pau1_is_top_used[1][i] = au1_is_top_used_l1[i];

            }

        }

    }

}