/******************************************************************************
*
* 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
* ihevcd_mv_merge.c
*
* @brief
* Contains functions for motion vector merge candidates derivation
*
* @author
* Ittiam
*
* @par List of Functions:
* - ihevcd_compare_pu_mv_t()
* - ihevcd_mv_pred_merge()
*
* @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_structs.h"
#include "ihevc_macros.h"
#include "ihevc_platform_macros.h"
#include "ihevc_cabac_tables.h"
#include "ihevc_disp_mgr.h"
#include "ihevc_buf_mgr.h"
#include "ihevc_dpb_mgr.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_fmt_conv.h"
#include "ihevcd_job_queue.h"
#include "ihevcd_debug.h"
#include "ihevcd_mv_merge.h"
/**
*******************************************************************************
*
* @brief Compare Motion vectors function
*
*
* @par Description:
* Checks if MVs and Reference idx are excatly matching.
*
* @param[inout] ps_1
* motion vector 1 to be compared
*
* @param[in] ps_2
* motion vector 2 to be compared
*
* @returns
* 0 : if not matching 1 : if matching
*
* @remarks
*
*******************************************************************************
*/
WORD32 ihevcd_compare_pu_t(pu_t *ps_pu_1, pu_t *ps_pu_2)
{
WORD32 l0_match = 0, l1_match = 0;
pu_mv_t *ps_mv_1, *ps_mv_2;
WORD32 pred_mode_1, pred_mode_2;
ps_mv_1 = &ps_pu_1->mv;
ps_mv_2 = &ps_pu_2->mv;
pred_mode_1 = ps_pu_1->b2_pred_mode;
pred_mode_2 = ps_pu_2->b2_pred_mode;
if(pred_mode_1 == pred_mode_2)
{
if(pred_mode_1 != PRED_L1)
{
if(ps_mv_1->i1_l0_ref_idx == ps_mv_2->i1_l0_ref_idx)
{
if(0 == memcmp(&ps_mv_1->s_l0_mv, &ps_mv_2->s_l0_mv, sizeof(mv_t)))
{
l0_match = 1;
}
}
}
if(pred_mode_1 != PRED_L0)
{
if(ps_mv_1->i1_l1_ref_idx == ps_mv_2->i1_l1_ref_idx)
{
if(0 == memcmp(&ps_mv_1->s_l1_mv, &ps_mv_2->s_l1_mv, sizeof(mv_t)))
{
l1_match = 1;
}
}
}
if(pred_mode_1 == PRED_BI)
return (l1_match && l0_match);
else if(pred_mode_1 == PRED_L0)
return l0_match;
else
return l1_match;
}
return 0;
}
void ihevcd_collocated_mvp(mv_ctxt_t *ps_mv_ctxt,
pu_t *ps_pu,
mv_t *ps_mv_col,
WORD32 *pu4_avail_col_flag,
WORD32 use_pu_ref_idx,
WORD32 x_col,
WORD32 y_col)
{
sps_t *ps_sps = ps_mv_ctxt->ps_sps;
slice_header_t *ps_slice_hdr = ps_mv_ctxt->ps_slice_hdr;
ref_list_t *ps_ref_list[2];
mv_buf_t *ps_mv_buf_col;
WORD32 xp_col, yp_col;
WORD32 col_ctb_x, col_ctb_y;
mv_t as_mv_col[2];
WORD32 log2_ctb_size;
WORD32 ctb_size;
WORD32 avail_col;
WORD32 col_ctb_idx, pu_cnt;
WORD32 au4_list_col[2];
WORD32 num_minpu_in_ctb;
UWORD8 *pu1_pic_pu_map_ctb;
pu_t *ps_col_pu;
WORD32 part_pos_y;
part_pos_y = ps_pu->b4_pos_y << 2;
log2_ctb_size = ps_sps->i1_log2_ctb_size;
ctb_size = (1 << log2_ctb_size);
avail_col = 1;
/* Initializing reference list */
ps_ref_list[0] = ps_slice_hdr->as_ref_pic_list0;
ps_ref_list[1] = ps_slice_hdr->as_ref_pic_list1;
if(PSLICE == ps_slice_hdr->i1_slice_type)
ps_ref_list[1] = ps_slice_hdr->as_ref_pic_list0;
if((ps_slice_hdr->i1_slice_type == BSLICE) && (ps_slice_hdr->i1_collocated_from_l0_flag == 0))
{
/* L1 */
ps_mv_buf_col = (mv_buf_t *)ps_ref_list[1][ps_slice_hdr->i1_collocated_ref_idx].pv_mv_buf;
}
else
{
/* L0 */
ps_mv_buf_col = (mv_buf_t *)ps_ref_list[0][ps_slice_hdr->i1_collocated_ref_idx].pv_mv_buf;
}
num_minpu_in_ctb = (ctb_size / MIN_PU_SIZE) * (ctb_size / MIN_PU_SIZE);
if(((part_pos_y >> log2_ctb_size) == (y_col >> log2_ctb_size))
&& ((x_col + (ps_mv_ctxt->i4_ctb_x << log2_ctb_size)) < ps_sps->i2_pic_width_in_luma_samples)
&& (((y_col + (ps_mv_ctxt->i4_ctb_y << log2_ctb_size))
< ps_sps->i2_pic_height_in_luma_samples)))
{
xp_col = ((x_col >> 4) << 4);
yp_col = ((y_col >> 4) << 4);
col_ctb_x = ps_mv_ctxt->i4_ctb_x + (xp_col >> log2_ctb_size);
col_ctb_y = ps_mv_ctxt->i4_ctb_y + (yp_col >> log2_ctb_size);
col_ctb_idx = col_ctb_x + (col_ctb_y)*(ps_sps->i2_pic_wd_in_ctb);
pu_cnt = ps_mv_buf_col->pu4_pic_pu_idx[col_ctb_idx];
pu1_pic_pu_map_ctb = ps_mv_buf_col->pu1_pic_pu_map
+ col_ctb_idx * num_minpu_in_ctb;
if(xp_col == ctb_size)
xp_col = 0;
pu_cnt += pu1_pic_pu_map_ctb[(yp_col >> 2)
* (ctb_size / MIN_PU_SIZE) + (xp_col >> 2)];
ps_col_pu = &ps_mv_buf_col->ps_pic_pu[pu_cnt];
}
else
avail_col = 0;
if((avail_col == 0) || (ps_col_pu->b1_intra_flag == 1)
|| (ps_slice_hdr->i1_slice_temporal_mvp_enable_flag == 0))
{
pu4_avail_col_flag[0] = 0;
pu4_avail_col_flag[1] = 0;
ps_mv_col[0].i2_mvx = 0;
ps_mv_col[0].i2_mvy = 0;
ps_mv_col[1].i2_mvx = 0;
ps_mv_col[1].i2_mvy = 0;
}
else
{
WORD32 au4_ref_idx_col[2];
WORD32 pred_flag_l0, pred_flag_l1;
pred_flag_l0 = (ps_col_pu->b2_pred_mode != PRED_L1);
pred_flag_l1 = (ps_col_pu->b2_pred_mode != PRED_L0);
if(pred_flag_l0 == 0)
{
as_mv_col[0] = ps_col_pu->mv.s_l1_mv;
au4_ref_idx_col[0] = ps_col_pu->mv.i1_l1_ref_idx;
au4_list_col[0] = 1; /* L1 */
as_mv_col[1] = ps_col_pu->mv.s_l1_mv;
au4_ref_idx_col[1] = ps_col_pu->mv.i1_l1_ref_idx;
au4_list_col[1] = 1; /* L1 */
}
else
{
if(pred_flag_l1 == 0)
{
as_mv_col[0] = ps_col_pu->mv.s_l0_mv;
au4_ref_idx_col[0] = ps_col_pu->mv.i1_l0_ref_idx;
au4_list_col[0] = 0; /* L1 */
as_mv_col[1] = ps_col_pu->mv.s_l0_mv;
au4_ref_idx_col[1] = ps_col_pu->mv.i1_l0_ref_idx;
au4_list_col[1] = 0; /* L1 */
}
else
{
if(1 == ps_slice_hdr->i1_low_delay_flag)
{
as_mv_col[0] = ps_col_pu->mv.s_l0_mv;
au4_ref_idx_col[0] = ps_col_pu->mv.i1_l0_ref_idx;
au4_list_col[0] = 0; /* L0 */
as_mv_col[1] = ps_col_pu->mv.s_l1_mv;
au4_ref_idx_col[1] = ps_col_pu->mv.i1_l1_ref_idx;
au4_list_col[1] = 1; /* L1 */
}
else
{
if(0 == ps_slice_hdr->i1_collocated_from_l0_flag)
{
as_mv_col[0] = ps_col_pu->mv.s_l0_mv;
au4_ref_idx_col[0] = ps_col_pu->mv.i1_l0_ref_idx;
as_mv_col[1] = ps_col_pu->mv.s_l0_mv;
au4_ref_idx_col[1] = ps_col_pu->mv.i1_l0_ref_idx;
}
else
{
as_mv_col[0] = ps_col_pu->mv.s_l1_mv;
au4_ref_idx_col[0] = ps_col_pu->mv.i1_l1_ref_idx;
as_mv_col[1] = ps_col_pu->mv.s_l1_mv;
au4_ref_idx_col[1] = ps_col_pu->mv.i1_l1_ref_idx;
}
au4_list_col[0] = ps_slice_hdr->i1_collocated_from_l0_flag; /* L"collocated_from_l0_flag" */
au4_list_col[1] = ps_slice_hdr->i1_collocated_from_l0_flag; /* L"collocated_from_l0_flag" */
}
}
}
avail_col = 1;
{
WORD32 cur_poc, col_poc, col_ref_poc_l0, cur_ref_poc;
WORD32 col_ref_poc_l0_lt, cur_ref_poc_lt;
WORD32 ref_idx_l0, ref_idx_l1;
WORD32 slice_idx;
pic_buf_t *ps_pic_buf;
if(use_pu_ref_idx)
{
ref_idx_l0 = ps_pu->mv.i1_l0_ref_idx;
ref_idx_l1 = ps_pu->mv.i1_l1_ref_idx;
}
else
{
ref_idx_l0 = 0;
ref_idx_l1 = 0;
}
col_poc = ps_mv_buf_col->i4_abs_poc;
cur_poc = ps_slice_hdr->i4_abs_pic_order_cnt;
slice_idx = *(ps_mv_buf_col->pu1_pic_slice_map + col_ctb_x + col_ctb_y * ps_sps->i2_pic_wd_in_ctb);
slice_idx &= (MAX_SLICE_HDR_CNT - 1);
if(au4_list_col[0] == 0)
{
col_ref_poc_l0 =
ps_mv_buf_col->ai4_l0_collocated_poc[slice_idx][au4_ref_idx_col[0]];
col_ref_poc_l0_lt =
(ps_mv_buf_col->ai1_l0_collocated_poc_lt[slice_idx][au4_ref_idx_col[0]] == LONG_TERM_REF);
}
else
{
col_ref_poc_l0 =
ps_mv_buf_col->ai4_l1_collocated_poc[slice_idx][au4_ref_idx_col[0]];
col_ref_poc_l0_lt =
(ps_mv_buf_col->ai1_l1_collocated_poc_lt[slice_idx][au4_ref_idx_col[0]] == LONG_TERM_REF);
}
/* L0 collocated mv */
ps_pic_buf = (pic_buf_t *)((ps_ref_list[0][ref_idx_l0].pv_pic_buf));
cur_ref_poc = ps_pic_buf->i4_abs_poc;
cur_ref_poc_lt = (ps_pic_buf->u1_used_as_ref == LONG_TERM_REF);
if(cur_ref_poc_lt == col_ref_poc_l0_lt)
{
pu4_avail_col_flag[0] = 1;
if(cur_ref_poc_lt || ((col_poc - col_ref_poc_l0) == (cur_poc - cur_ref_poc)))
{
ps_mv_col[0] = as_mv_col[0];
}
else
{
ps_mv_col[0] = as_mv_col[0];
if(col_ref_poc_l0 != col_poc)
ihevcd_scale_collocated_mv((mv_t *)(&ps_mv_col[0]), cur_ref_poc,
col_ref_poc_l0, col_poc, cur_poc);
}
}
else
{
pu4_avail_col_flag[0] = 0;
ps_mv_col[0].i2_mvx = 0;
ps_mv_col[0].i2_mvy = 0;
}
if((BSLICE == ps_slice_hdr->i1_slice_type))
{
WORD32 col_ref_poc_l1_lt, col_ref_poc_l1;
if(au4_list_col[1] == 0)
{
col_ref_poc_l1 =
ps_mv_buf_col->ai4_l0_collocated_poc[slice_idx][au4_ref_idx_col[1]];
col_ref_poc_l1_lt =
(ps_mv_buf_col->ai1_l0_collocated_poc_lt[slice_idx][au4_ref_idx_col[1]] == LONG_TERM_REF);
}
else
{
col_ref_poc_l1 =
ps_mv_buf_col->ai4_l1_collocated_poc[slice_idx][au4_ref_idx_col[1]];
col_ref_poc_l1_lt =
(ps_mv_buf_col->ai1_l1_collocated_poc_lt[slice_idx][au4_ref_idx_col[1]] == LONG_TERM_REF);
}
/* L1 collocated mv */
ps_pic_buf = (pic_buf_t *)((ps_ref_list[1][ref_idx_l1].pv_pic_buf));
cur_ref_poc = ps_pic_buf->i4_abs_poc;
cur_ref_poc_lt = (ps_pic_buf->u1_used_as_ref == LONG_TERM_REF);
if(cur_ref_poc_lt == col_ref_poc_l1_lt)
{
pu4_avail_col_flag[1] = 1;
if(cur_ref_poc_lt || ((col_poc - col_ref_poc_l1) == (cur_poc - cur_ref_poc)))
{
ps_mv_col[1] = as_mv_col[1];
}
else
{
ps_mv_col[1] = as_mv_col[1];
if(col_ref_poc_l1 != col_poc)
ihevcd_scale_collocated_mv((mv_t *)&ps_mv_col[1], cur_ref_poc,
col_ref_poc_l1, col_poc, cur_poc);
}
}
else
{
pu4_avail_col_flag[1] = 0;
ps_mv_col[1].i2_mvx = 0;
ps_mv_col[1].i2_mvy = 0;
}
}
else
{
pu4_avail_col_flag[1] = 0;
}
}
}
}
/**
*******************************************************************************
*
* @brief
* This function performs Motion Vector Merge candidates derivation
*
* @par Description:
* MV merge 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[in] part_mode
* Partition mode @sa PART_SIZE_E
*
* @param[in] part_idx
* Partition idx of current partition inside CU
*
* @param[in] single_mcl_flag
* Single MCL flag based on 8x8 CU and Parallel merge value
*
* @param[out] ps_merge_cand_list
* pointer to store MV merge candidates list
*
* @returns
* None
* @remarks
*
*
*******************************************************************************
*/
void ihevcd_mv_merge(mv_ctxt_t *ps_mv_ctxt,
UWORD32 *pu4_top_pu_idx,
UWORD32 *pu4_left_pu_idx,
WORD32 left_nbr_4x4_strd,
pu_t *ps_pu,
WORD32 part_mode,
WORD32 part_idx,
WORD32 part_wd,
WORD32 part_ht,
WORD32 part_pos_x,
WORD32 part_pos_y,
WORD32 single_mcl_flag,
WORD32 lb_avail,
WORD32 l_avail,
WORD32 tr_avail,
WORD32 t_avail,
WORD32 tl_avail)
{
/******************************************************/
/* Spatial Merge Candidates */
/******************************************************/
slice_header_t *ps_slice_hdr;
pu_t as_pu_merge_list[MAX_NUM_MERGE_CAND];
pps_t *ps_pps;
ref_list_t *ps_ref_list[2];
WORD32 sum_avail_a0_a1_b0_b1 = 0; /*Sum of availability of A0, A1, B0, B1*/
WORD32 nbr_x, nbr_y;
WORD32 nbr_avail[MAX_NUM_MV_NBR];
WORD32 merge_shift;
WORD32 nbr_pu_idx;
pu_t *ps_nbr_pu[MAX_NUM_MV_NBR];
WORD32 max_num_merge_cand;
WORD32 candidate_cnt;
WORD32 pos_x_merge_shift, pos_y_merge_shift;
ps_slice_hdr = ps_mv_ctxt->ps_slice_hdr;
ps_pps = ps_mv_ctxt->ps_pps;
/* Initializing reference list */
ps_ref_list[0] = ps_slice_hdr->as_ref_pic_list0;
ps_ref_list[1] = ps_slice_hdr->as_ref_pic_list1;
if(PSLICE == ps_slice_hdr->i1_slice_type)
ps_ref_list[1] = ps_slice_hdr->as_ref_pic_list0;
candidate_cnt = 0;
/*******************************************/
/* Neighbor location: Graphical indication */
/* */
/* B2 _____________B1 B0 */
/* | | */
/* | | */
/* | | */
/* | PU ht| */
/* | | */
/* | | */
/* A1|______wd_______| */
/* A0 */
/* */
/*******************************************/
merge_shift = ps_pps->i1_log2_parallel_merge_level;
/* Availability check */
/* A1 */
nbr_x = part_pos_x - 1;
nbr_y = part_pos_y + part_ht - 1; /* A1 */
nbr_pu_idx = *(pu4_left_pu_idx + ((nbr_y - part_pos_y) >> 2) * left_nbr_4x4_strd);
ps_nbr_pu[NBR_A1] = ps_mv_ctxt->ps_pic_pu + nbr_pu_idx;
nbr_avail[NBR_A1] = l_avail
&& (!ps_nbr_pu[NBR_A1]->b1_intra_flag); /* A1 */
pos_x_merge_shift = (part_pos_x >> merge_shift);
pos_y_merge_shift = (part_pos_y >> merge_shift);
max_num_merge_cand = ps_pu->b3_merge_idx + 1;
{
if(nbr_avail[NBR_A1])
{
/* if at same merge level */
if(pos_x_merge_shift == (nbr_x >> merge_shift) &&
(pos_y_merge_shift == (nbr_y >> merge_shift)))
{
nbr_avail[NBR_A1] = 0;
}
/* SPEC JCTVC-K1003_v9 version has a different way using not available */
/* candidates compared to software. for non square part and seconf part case */
/* ideally nothing from the 1st partition should be used as per spec but */
/* HM 8.2 dev verison does not adhere to this. currenlty code fllows HM */
/* if single MCL is 0 , second part of 2 part in CU */
else if((single_mcl_flag == 0) && (part_idx == 1) &&
((part_mode == PART_Nx2N) || (part_mode == PART_nLx2N) ||
(part_mode == PART_nRx2N)))
{
nbr_avail[NBR_A1] = 0;
}
sum_avail_a0_a1_b0_b1 += nbr_avail[NBR_A1];
if(nbr_avail[NBR_A1])
{
as_pu_merge_list[candidate_cnt] = *ps_nbr_pu[NBR_A1];
candidate_cnt++;
if(candidate_cnt == max_num_merge_cand)
{
ps_pu[0].mv = as_pu_merge_list[candidate_cnt - 1].mv;
ps_pu[0].b2_pred_mode = as_pu_merge_list[candidate_cnt - 1].b2_pred_mode;
return;
}
}
}
}
/* B1 */
nbr_x = part_pos_x + part_wd - 1;
nbr_y = part_pos_y - 1;
nbr_pu_idx = *(pu4_top_pu_idx + ((nbr_x - part_pos_x) >> 2));
ps_nbr_pu[NBR_B1] = ps_mv_ctxt->ps_pic_pu + nbr_pu_idx;
nbr_avail[NBR_B1] = t_avail
&& (!ps_nbr_pu[NBR_B1]->b1_intra_flag); /* B1 */
{
WORD32 avail_flag;
avail_flag = nbr_avail[NBR_B1];
if(nbr_avail[NBR_B1])
{
/* if at same merge level */
if(pos_x_merge_shift == (nbr_x >> merge_shift) &&
(pos_y_merge_shift == (nbr_y >> merge_shift)))
{
nbr_avail[NBR_B1] = 0;
avail_flag = 0;
}
/* if single MCL is 0 , second part of 2 part in CU */
else if((single_mcl_flag == 0) && (part_idx == 1) &&
((part_mode == PART_2NxN) || (part_mode == PART_2NxnU) ||
(part_mode == PART_2NxnD)))
{
nbr_avail[NBR_B1] = 0;
avail_flag = 0;
}
else if(nbr_avail[NBR_A1])
{
avail_flag = !ihevcd_compare_pu_t(ps_nbr_pu[NBR_A1], ps_nbr_pu[NBR_B1]);
}
sum_avail_a0_a1_b0_b1 += avail_flag;
if(avail_flag)
{
as_pu_merge_list[candidate_cnt] = *ps_nbr_pu[NBR_B1];
candidate_cnt++;
if(candidate_cnt == max_num_merge_cand)
{
ps_pu[0].mv = as_pu_merge_list[candidate_cnt - 1].mv;
ps_pu[0].b2_pred_mode = as_pu_merge_list[candidate_cnt - 1].b2_pred_mode;
return;
}
}
}
}
/* B0 */
nbr_x = part_pos_x + part_wd;
nbr_y = part_pos_y - 1;
nbr_pu_idx = *(pu4_top_pu_idx + ((nbr_x - part_pos_x) >> 2));
ps_nbr_pu[NBR_B0] = ps_mv_ctxt->ps_pic_pu + nbr_pu_idx;
nbr_avail[NBR_B0] = tr_avail
&& (!ps_nbr_pu[NBR_B0]->b1_intra_flag); /* B0 */
{
WORD32 avail_flag;
avail_flag = nbr_avail[NBR_B0];
/* if at same merge level */
if(nbr_avail[NBR_B0])
{
if(pos_x_merge_shift == (nbr_x >> merge_shift) &&
(pos_y_merge_shift == (nbr_y >> merge_shift)))
{
nbr_avail[NBR_B0] = 0;
avail_flag = 0;
}
else if(nbr_avail[NBR_B1])
{
avail_flag = !ihevcd_compare_pu_t(ps_nbr_pu[NBR_B1], ps_nbr_pu[NBR_B0]);
}
sum_avail_a0_a1_b0_b1 += avail_flag;
if(avail_flag)
{
as_pu_merge_list[candidate_cnt] = *ps_nbr_pu[NBR_B0];
candidate_cnt++;
if(candidate_cnt == max_num_merge_cand)
{
ps_pu[0].mv = as_pu_merge_list[candidate_cnt - 1].mv;
ps_pu[0].b2_pred_mode = as_pu_merge_list[candidate_cnt - 1].b2_pred_mode;
return;
}
}
}
}
/* A0 */
nbr_x = part_pos_x - 1;
nbr_y = part_pos_y + part_ht; /* A0 */
nbr_pu_idx = *(pu4_left_pu_idx + ((nbr_y - part_pos_y) >> 2) * left_nbr_4x4_strd);
ps_nbr_pu[NBR_A0] = ps_mv_ctxt->ps_pic_pu + nbr_pu_idx;
nbr_avail[NBR_A0] = lb_avail
&& (!ps_nbr_pu[NBR_A0]->b1_intra_flag); /* A0 */
{
WORD32 avail_flag;
avail_flag = nbr_avail[NBR_A0];
if(nbr_avail[NBR_A0])
{
/* if at same merge level */
if(pos_x_merge_shift == (nbr_x >> merge_shift) &&
(pos_y_merge_shift == (nbr_y >> merge_shift)))
{
nbr_avail[NBR_A0] = 0;
avail_flag = 0;
}
else if(nbr_avail[NBR_A1])
{
avail_flag = !ihevcd_compare_pu_t(ps_nbr_pu[NBR_A1], ps_nbr_pu[NBR_A0]);
}
sum_avail_a0_a1_b0_b1 += avail_flag;
if(avail_flag)
{
as_pu_merge_list[candidate_cnt] = *ps_nbr_pu[NBR_A0];
candidate_cnt++;
if(candidate_cnt == max_num_merge_cand)
{
ps_pu[0].mv = as_pu_merge_list[candidate_cnt - 1].mv;
ps_pu[0].b2_pred_mode = as_pu_merge_list[candidate_cnt - 1].b2_pred_mode;
return;
}
}
}
}
/* B2 */
nbr_x = part_pos_x - 1;
nbr_y = part_pos_y - 1; /* B2 */
nbr_pu_idx = *(pu4_top_pu_idx + ((nbr_x - part_pos_x) >> 2));
ps_nbr_pu[NBR_B2] = ps_mv_ctxt->ps_pic_pu + nbr_pu_idx;
nbr_avail[NBR_B2] = tl_avail
&& (!ps_nbr_pu[NBR_B2]->b1_intra_flag); /* B2 */
{
WORD32 avail_flag;
avail_flag = nbr_avail[NBR_B2];
if(nbr_avail[NBR_B2])
{
/* if at same merge level */
if(pos_x_merge_shift == (nbr_x >> merge_shift) &&
(pos_y_merge_shift == (nbr_y >> merge_shift)))
{
nbr_avail[NBR_B2] = 0;
avail_flag = 0;
}
else if(4 == sum_avail_a0_a1_b0_b1)
{
avail_flag = 0;
}
else
{
if(nbr_avail[NBR_A1])
{
avail_flag = !ihevcd_compare_pu_t(ps_nbr_pu[NBR_A1], ps_nbr_pu[NBR_B2]);
}
if(avail_flag && nbr_avail[NBR_B1])
{
avail_flag = !ihevcd_compare_pu_t(ps_nbr_pu[NBR_B1], ps_nbr_pu[NBR_B2]);
}
}
if(avail_flag)
{
as_pu_merge_list[candidate_cnt] = *ps_nbr_pu[NBR_B2];
candidate_cnt++;
if(candidate_cnt == max_num_merge_cand)
{
ps_pu[0].mv = as_pu_merge_list[candidate_cnt - 1].mv;
ps_pu[0].b2_pred_mode = as_pu_merge_list[candidate_cnt - 1].b2_pred_mode;
return;
}
}
}
}
/***********************************************************/
/* Collocated MV prediction */
/***********************************************************/
{
mv_t as_mv_col[2];
WORD32 avail_col_flag[2] = { 0 }, x_col, y_col;
WORD32 avail_col_l0, avail_col_l1;
// ihevcd_collocated_mvp(ps_mv_ctxt,ps_pu,part_pos_x,part_pos_y,part_wd,part_ht,as_mv_col,avail_col_flag,0);
/* Checking Collocated MV availability at Bottom right of PU*/
x_col = part_pos_x + part_wd;
y_col = part_pos_y + part_ht;
ihevcd_collocated_mvp(ps_mv_ctxt, ps_pu, as_mv_col, avail_col_flag, 0, 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)
{
as_pu_merge_list[candidate_cnt].mv.s_l0_mv = as_mv_col[0];
as_pu_merge_list[candidate_cnt].mv.s_l1_mv = 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);
ihevcd_collocated_mvp(ps_mv_ctxt, ps_pu, as_mv_col, avail_col_flag, 0, x_col, y_col);
if(avail_col_l0 == 0)
{
as_pu_merge_list[candidate_cnt].mv.s_l0_mv = as_mv_col[0];
}
if(avail_col_l1 == 0)
{
as_pu_merge_list[candidate_cnt].mv.s_l1_mv = as_mv_col[1];
}
avail_col_l0 |= avail_col_flag[0];
avail_col_l1 |= avail_col_flag[1];
}
as_pu_merge_list[candidate_cnt].mv.i1_l0_ref_idx = 0;
as_pu_merge_list[candidate_cnt].mv.i1_l1_ref_idx = 0;
as_pu_merge_list[candidate_cnt].b2_pred_mode = avail_col_l0 ? (avail_col_l1 ? PRED_BI : PRED_L0) : PRED_L1;
candidate_cnt += (avail_col_l0 || avail_col_l1);
if(candidate_cnt == max_num_merge_cand)
{
ps_pu[0].mv = as_pu_merge_list[candidate_cnt - 1].mv;
ps_pu[0].b2_pred_mode = as_pu_merge_list[candidate_cnt - 1].b2_pred_mode;
return;
}
}
{
WORD32 slice_type;
slice_type = ps_slice_hdr->i1_slice_type;
/* Colocated mv has to be added to list, if available */
/******************************************************/
/* Bi pred merge candidates */
/******************************************************/
if(slice_type == BSLICE)
{
if((candidate_cnt > 1) && (candidate_cnt < MAX_NUM_MERGE_CAND))
{
WORD32 priority_list0[12] =
{ 0, 1, 0, 2, 1, 2, 0, 3, 1, 3, 2, 3 };
WORD32 priority_list1[12] =
{ 1, 0, 2, 0, 2, 1, 3, 0, 3, 1, 3, 2 };
WORD32 l0_cand, l1_cand;
WORD32 bi_pred_idx = 0;
WORD32 total_bi_pred_cand =
candidate_cnt * (candidate_cnt - 1);
while(bi_pred_idx < total_bi_pred_cand)
{
l0_cand = priority_list0[bi_pred_idx];
l1_cand = priority_list1[bi_pred_idx];
if((as_pu_merge_list[l0_cand].b2_pred_mode != PRED_L1)
&& (as_pu_merge_list[l1_cand].b2_pred_mode
!= PRED_L0))
{
WORD8 i1_l0_ref_idx, i1_l1_ref_idx;
mv_t s_l0_mv, s_l1_mv;
pic_buf_t *ps_pic_buf_l0, *ps_pic_buf_l1;
i1_l0_ref_idx = as_pu_merge_list[l0_cand].mv.i1_l0_ref_idx;
i1_l1_ref_idx = as_pu_merge_list[l1_cand].mv.i1_l1_ref_idx;
ps_pic_buf_l0 = (pic_buf_t *)((ps_ref_list[0][i1_l0_ref_idx].pv_pic_buf));
ps_pic_buf_l1 = (pic_buf_t *)((ps_ref_list[1][i1_l1_ref_idx].pv_pic_buf));
s_l0_mv = as_pu_merge_list[l0_cand].mv.s_l0_mv;
s_l1_mv = as_pu_merge_list[l1_cand].mv.s_l1_mv;
if((ps_pic_buf_l0->i4_abs_poc != ps_pic_buf_l1->i4_abs_poc)
|| (s_l0_mv.i2_mvx != s_l1_mv.i2_mvx)
|| (s_l0_mv.i2_mvy != s_l1_mv.i2_mvy))
{
candidate_cnt++;
if(candidate_cnt == max_num_merge_cand)
{
ps_pu[0].mv.s_l0_mv = s_l0_mv;
ps_pu[0].mv.s_l1_mv = s_l1_mv;
ps_pu[0].mv.i1_l0_ref_idx = i1_l0_ref_idx;
ps_pu[0].mv.i1_l1_ref_idx = i1_l1_ref_idx;
ps_pu[0].b2_pred_mode = PRED_BI;
return;
}
}
}
bi_pred_idx++;
if((bi_pred_idx == total_bi_pred_cand)
|| (candidate_cnt == MAX_NUM_MERGE_CAND))
{
break;
}
}
}
}
/******************************************************/
/* Zero merge candidates */
/******************************************************/
// if(candidate_cnt < max_num_merge_cand)
{
WORD32 num_ref_idx;
WORD32 zero_idx;
zero_idx = max_num_merge_cand - candidate_cnt - 1;
if(slice_type == PSLICE)
num_ref_idx = ps_slice_hdr->i1_num_ref_idx_l0_active;
else
/* Slice type B */
num_ref_idx = MIN(ps_slice_hdr->i1_num_ref_idx_l0_active, ps_slice_hdr->i1_num_ref_idx_l1_active);
if(zero_idx >= num_ref_idx)
zero_idx = 0;
ps_pu[0].mv.i1_l0_ref_idx = zero_idx;
if(slice_type == PSLICE)
{
ps_pu[0].mv.i1_l1_ref_idx = 0;
ps_pu[0].b2_pred_mode = PRED_L0;
}
else /* Slice type B */
{
ps_pu[0].mv.i1_l1_ref_idx = zero_idx;
ps_pu[0].b2_pred_mode = PRED_BI;
}
ps_pu[0].mv.s_l0_mv.i2_mvx = 0;
ps_pu[0].mv.s_l0_mv.i2_mvy = 0;
ps_pu[0].mv.s_l1_mv.i2_mvx = 0;
ps_pu[0].mv.s_l1_mv.i2_mvy = 0;
candidate_cnt++;
}
}
return;
}