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ffmpeg/libavcodec/hevc/mvs.c
Anton Khirnov 9bccc634af lavc/hevcdec: make a HEVCFrame hold a reference to its PPS 
ff_hevc_get_ref_list() needs the PPS of a previously decoded frame,
which may be different from the currently active one.
2024-09-06 13:59:29 +02:00

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/*
* HEVC video decoder
*
* Copyright (C) 2012 - 2013 Guillaume Martres
* Copyright (C) 2013 Anand Meher Kotra
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "hevc.h"
#include "hevcdec.h"
#include "progressframe.h"
static const uint8_t l0_l1_cand_idx[12][2] = {
{ 0, 1, },
{ 1, 0, },
{ 0, 2, },
{ 2, 0, },
{ 1, 2, },
{ 2, 1, },
{ 0, 3, },
{ 3, 0, },
{ 1, 3, },
{ 3, 1, },
{ 2, 3, },
{ 3, 2, },
};
void ff_hevc_set_neighbour_available(HEVCLocalContext *lc, int x0, int y0,
int nPbW, int nPbH, int log2_ctb_size)
{
int x0b = av_zero_extend(x0, log2_ctb_size);
int y0b = av_zero_extend(y0, log2_ctb_size);
lc->na.cand_up = (lc->ctb_up_flag || y0b);
lc->na.cand_left = (lc->ctb_left_flag || x0b);
lc->na.cand_up_left = (x0b || y0b) ? lc->na.cand_left && lc->na.cand_up : lc->ctb_up_left_flag;
lc->na.cand_up_right_sap =
(x0b + nPbW == 1 << log2_ctb_size) ?
lc->ctb_up_right_flag && !y0b : lc->na.cand_up;
lc->na.cand_up_right =
lc->na.cand_up_right_sap
&& (x0 + nPbW) < lc->end_of_tiles_x;
lc->na.cand_bottom_left = ((y0 + nPbH) >= lc->end_of_tiles_y) ? 0 : lc->na.cand_left;
}
/*
* 6.4.1 Derivation process for z-scan order block availability
*/
static av_always_inline int
z_scan_block_avail(const HEVCPPS *pps, const HEVCSPS *sps,
int xCurr, int yCurr, int xN, int yN)
{
#define MIN_TB_ADDR_ZS(x, y) \
pps->min_tb_addr_zs[(y) * (sps->tb_mask+2) + (x)]
int xCurr_ctb = xCurr >> sps->log2_ctb_size;
int yCurr_ctb = yCurr >> sps->log2_ctb_size;
int xN_ctb = xN >> sps->log2_ctb_size;
int yN_ctb = yN >> sps->log2_ctb_size;
if( yN_ctb < yCurr_ctb || xN_ctb < xCurr_ctb )
return 1;
else {
int Curr = MIN_TB_ADDR_ZS((xCurr >> sps->log2_min_tb_size) & sps->tb_mask,
(yCurr >> sps->log2_min_tb_size) & sps->tb_mask);
int N = MIN_TB_ADDR_ZS((xN >> sps->log2_min_tb_size) & sps->tb_mask,
(yN >> sps->log2_min_tb_size) & sps->tb_mask);
return N <= Curr;
}
}
//check if the two luma locations belong to the same motion estimation region
static av_always_inline int is_diff_mer(const HEVCPPS *pps, int xN, int yN, int xP, int yP)
{
uint8_t plevel = pps->log2_parallel_merge_level;
return xN >> plevel == xP >> plevel &&
yN >> plevel == yP >> plevel;
}
#define MATCH_MV(x) (AV_RN32A(&A.x) == AV_RN32A(&B.x))
#define MATCH(x) (A.x == B.x)
// check if the mv's and refidx are the same between A and B
static av_always_inline int compare_mv_ref_idx(struct MvField A, struct MvField B)
{
int a_pf = A.pred_flag;
int b_pf = B.pred_flag;
if (a_pf == b_pf) {
if (a_pf == PF_BI) {
return MATCH(ref_idx[0]) && MATCH_MV(mv[0]) &&
MATCH(ref_idx[1]) && MATCH_MV(mv[1]);
} else if (a_pf == PF_L0) {
return MATCH(ref_idx[0]) && MATCH_MV(mv[0]);
} else if (a_pf == PF_L1) {
return MATCH(ref_idx[1]) && MATCH_MV(mv[1]);
}
}
return 0;
}
static av_always_inline void mv_scale(Mv *dst, const Mv *src, int td, int tb)
{
int tx, scale_factor;
td = av_clip_int8(td);
tb = av_clip_int8(tb);
tx = (0x4000 + abs(td / 2)) / td;
scale_factor = av_clip_intp2((tb * tx + 32) >> 6, 12);
dst->x = av_clip_int16((scale_factor * src->x + 127 +
(scale_factor * src->x < 0)) >> 8);
dst->y = av_clip_int16((scale_factor * src->y + 127 +
(scale_factor * src->y < 0)) >> 8);
}
static int check_mvset(Mv *mvLXCol, const Mv *mvCol,
int colPic, int poc,
const RefPicList *refPicList, int X, int refIdxLx,
const RefPicList *refPicList_col, int listCol, int refidxCol)
{
int cur_lt = refPicList[X].isLongTerm[refIdxLx];
int col_lt = refPicList_col[listCol].isLongTerm[refidxCol];
int col_poc_diff, cur_poc_diff;
if (cur_lt != col_lt) {
mvLXCol->x = 0;
mvLXCol->y = 0;
return 0;
}
col_poc_diff = colPic - refPicList_col[listCol].list[refidxCol];
cur_poc_diff = poc - refPicList[X].list[refIdxLx];
if (cur_lt || col_poc_diff == cur_poc_diff || !col_poc_diff) {
mvLXCol->x = mvCol->x;
mvLXCol->y = mvCol->y;
} else {
mv_scale(mvLXCol, mvCol, col_poc_diff, cur_poc_diff);
}
return 1;
}
#define CHECK_MVSET(l) \
check_mvset(mvLXCol, temp_col.mv + l, \
colPic, s->poc, \
refPicList, X, refIdxLx, \
refPicList_col, L ## l, temp_col.ref_idx[l])
// derive the motion vectors section 8.5.3.1.8
static int derive_temporal_colocated_mvs(const HEVCContext *s, MvField temp_col,
int refIdxLx, Mv *mvLXCol, int X,
int colPic, const RefPicList *refPicList_col)
{
const RefPicList *refPicList = s->cur_frame->refPicList;
if (temp_col.pred_flag == PF_INTRA)
return 0;
if (!(temp_col.pred_flag & PF_L0))
return CHECK_MVSET(1);
else if (temp_col.pred_flag == PF_L0)
return CHECK_MVSET(0);
else if (temp_col.pred_flag == PF_BI) {
int check_diffpicount = 0;
int i, j;
for (j = 0; j < 2; j++) {
for (i = 0; i < refPicList[j].nb_refs; i++) {
if (refPicList[j].list[i] > s->poc) {
check_diffpicount++;
break;
}
}
}
if (!check_diffpicount) {
if (X==0)
return CHECK_MVSET(0);
else
return CHECK_MVSET(1);
} else {
if (s->sh.collocated_list == L1)
return CHECK_MVSET(0);
else
return CHECK_MVSET(1);
}
}
return 0;
}
#define TAB_MVF(x, y) \
tab_mvf[(y) * min_pu_width + x]
#define TAB_MVF_PU(v) \
TAB_MVF(((x ## v) >> sps->log2_min_pu_size), \
((y ## v) >> sps->log2_min_pu_size))
#define DERIVE_TEMPORAL_COLOCATED_MVS \
derive_temporal_colocated_mvs(s, temp_col, \
refIdxLx, mvLXCol, X, colPic, \
ff_hevc_get_ref_list(ref, x, y))
/*
* 8.5.3.1.7 temporal luma motion vector prediction
*/
static int temporal_luma_motion_vector(const HEVCContext *s, const HEVCSPS *sps,
int x0, int y0,
int nPbW, int nPbH, int refIdxLx,
Mv *mvLXCol, int X)
{
const MvField *tab_mvf;
MvField temp_col;
int x, y, x_pu, y_pu;
int min_pu_width = sps->min_pu_width;
int availableFlagLXCol = 0;
int colPic;
const HEVCFrame *ref = s->collocated_ref;
if (!ref) {
memset(mvLXCol, 0, sizeof(*mvLXCol));
return 0;
}
tab_mvf = ref->tab_mvf;
colPic = ref->poc;
//bottom right collocated motion vector
x = x0 + nPbW;
y = y0 + nPbH;
if (tab_mvf &&
(y0 >> sps->log2_ctb_size) == (y >> sps->log2_ctb_size) &&
y < sps->height &&
x < sps->width) {
x &= ~15;
y &= ~15;
if (s->avctx->active_thread_type == FF_THREAD_FRAME)
ff_progress_frame_await(&ref->tf, y);
x_pu = x >> sps->log2_min_pu_size;
y_pu = y >> sps->log2_min_pu_size;
temp_col = TAB_MVF(x_pu, y_pu);
availableFlagLXCol = DERIVE_TEMPORAL_COLOCATED_MVS;
}
// derive center collocated motion vector
if (tab_mvf && !availableFlagLXCol) {
x = x0 + (nPbW >> 1);
y = y0 + (nPbH >> 1);
x &= ~15;
y &= ~15;
if (s->avctx->active_thread_type == FF_THREAD_FRAME)
ff_progress_frame_await(&ref->tf, y);
x_pu = x >> sps->log2_min_pu_size;
y_pu = y >> sps->log2_min_pu_size;
temp_col = TAB_MVF(x_pu, y_pu);
availableFlagLXCol = DERIVE_TEMPORAL_COLOCATED_MVS;
}
return availableFlagLXCol;
}
#define AVAILABLE(cand, v) \
(cand && !(TAB_MVF_PU(v).pred_flag == PF_INTRA))
#define PRED_BLOCK_AVAILABLE(v) \
z_scan_block_avail(pps, sps, x0, y0, x ## v, y ## v)
#define COMPARE_MV_REFIDX(a, b) \
compare_mv_ref_idx(TAB_MVF_PU(a), TAB_MVF_PU(b))
/*
* 8.5.3.1.2 Derivation process for spatial merging candidates
*/
static void derive_spatial_merge_candidates(HEVCLocalContext *lc, const HEVCContext *s,
const HEVCPPS *pps, const HEVCSPS *sps,
int x0, int y0,
int nPbW, int nPbH,
int log2_cb_size,
int singleMCLFlag, int part_idx,
int merge_idx,
struct MvField mergecandlist[])
{
const RefPicList *refPicList = s->cur_frame->refPicList;
const MvField *tab_mvf = s->cur_frame->tab_mvf;
const int min_pu_width = sps->min_pu_width;
const int cand_bottom_left = lc->na.cand_bottom_left;
const int cand_left = lc->na.cand_left;
const int cand_up_left = lc->na.cand_up_left;
const int cand_up = lc->na.cand_up;
const int cand_up_right = lc->na.cand_up_right_sap;
const int xA1 = x0 - 1;
const int yA1 = y0 + nPbH - 1;
const int xB1 = x0 + nPbW - 1;
const int yB1 = y0 - 1;
const int xB0 = x0 + nPbW;
const int yB0 = y0 - 1;
const int xA0 = x0 - 1;
const int yA0 = y0 + nPbH;
const int xB2 = x0 - 1;
const int yB2 = y0 - 1;
const int nb_refs = (s->sh.slice_type == HEVC_SLICE_P) ?
s->sh.nb_refs[0] : FFMIN(s->sh.nb_refs[0], s->sh.nb_refs[1]);
int zero_idx = 0;
int nb_merge_cand = 0;
int nb_orig_merge_cand = 0;
int is_available_a0;
int is_available_a1;
int is_available_b0;
int is_available_b1;
int is_available_b2;
if (!singleMCLFlag && part_idx == 1 &&
(lc->cu.part_mode == PART_Nx2N ||
lc->cu.part_mode == PART_nLx2N ||
lc->cu.part_mode == PART_nRx2N) ||
is_diff_mer(pps, xA1, yA1, x0, y0)) {
is_available_a1 = 0;
} else {
is_available_a1 = AVAILABLE(cand_left, A1);
if (is_available_a1) {
mergecandlist[nb_merge_cand] = TAB_MVF_PU(A1);
if (merge_idx == 0)
return;
nb_merge_cand++;
}
}
if (!singleMCLFlag && part_idx == 1 &&
(lc->cu.part_mode == PART_2NxN ||
lc->cu.part_mode == PART_2NxnU ||
lc->cu.part_mode == PART_2NxnD) ||
is_diff_mer(pps, xB1, yB1, x0, y0)) {
is_available_b1 = 0;
} else {
is_available_b1 = AVAILABLE(cand_up, B1);
if (is_available_b1 &&
!(is_available_a1 && COMPARE_MV_REFIDX(B1, A1))) {
mergecandlist[nb_merge_cand] = TAB_MVF_PU(B1);
if (merge_idx == nb_merge_cand)
return;
nb_merge_cand++;
}
}
// above right spatial merge candidate
is_available_b0 = AVAILABLE(cand_up_right, B0) &&
xB0 < sps->width &&
PRED_BLOCK_AVAILABLE(B0) &&
!is_diff_mer(pps, xB0, yB0, x0, y0);
if (is_available_b0 &&
!(is_available_b1 && COMPARE_MV_REFIDX(B0, B1))) {
mergecandlist[nb_merge_cand] = TAB_MVF_PU(B0);
if (merge_idx == nb_merge_cand)
return;
nb_merge_cand++;
}
// left bottom spatial merge candidate
is_available_a0 = AVAILABLE(cand_bottom_left, A0) &&
yA0 < sps->height &&
PRED_BLOCK_AVAILABLE(A0) &&
!is_diff_mer(pps, xA0, yA0, x0, y0);
if (is_available_a0 &&
!(is_available_a1 && COMPARE_MV_REFIDX(A0, A1))) {
mergecandlist[nb_merge_cand] = TAB_MVF_PU(A0);
if (merge_idx == nb_merge_cand)
return;
nb_merge_cand++;
}
// above left spatial merge candidate
is_available_b2 = AVAILABLE(cand_up_left, B2) &&
!is_diff_mer(pps, xB2, yB2, x0, y0);
if (is_available_b2 &&
!(is_available_a1 && COMPARE_MV_REFIDX(B2, A1)) &&
!(is_available_b1 && COMPARE_MV_REFIDX(B2, B1)) &&
nb_merge_cand != 4) {
mergecandlist[nb_merge_cand] = TAB_MVF_PU(B2);
if (merge_idx == nb_merge_cand)
return;
nb_merge_cand++;
}
// temporal motion vector candidate
if (s->sh.slice_temporal_mvp_enabled_flag &&
nb_merge_cand < s->sh.max_num_merge_cand) {
Mv mv_l0_col = { 0 }, mv_l1_col = { 0 };
int available_l0 = temporal_luma_motion_vector(s, sps, x0, y0, nPbW, nPbH,
0, &mv_l0_col, 0);
int available_l1 = (s->sh.slice_type == HEVC_SLICE_B) ?
temporal_luma_motion_vector(s, sps, x0, y0, nPbW, nPbH,
0, &mv_l1_col, 1) : 0;
if (available_l0 || available_l1) {
mergecandlist[nb_merge_cand].pred_flag = available_l0 + (available_l1 << 1);
AV_ZERO16(mergecandlist[nb_merge_cand].ref_idx);
mergecandlist[nb_merge_cand].mv[0] = mv_l0_col;
mergecandlist[nb_merge_cand].mv[1] = mv_l1_col;
if (merge_idx == nb_merge_cand)
return;
nb_merge_cand++;
}
}
nb_orig_merge_cand = nb_merge_cand;
// combined bi-predictive merge candidates (applies for B slices)
if (s->sh.slice_type == HEVC_SLICE_B && nb_orig_merge_cand > 1 &&
nb_orig_merge_cand < s->sh.max_num_merge_cand) {
int comb_idx = 0;
for (comb_idx = 0; nb_merge_cand < s->sh.max_num_merge_cand &&
comb_idx < nb_orig_merge_cand * (nb_orig_merge_cand - 1); comb_idx++) {
int l0_cand_idx = l0_l1_cand_idx[comb_idx][0];
int l1_cand_idx = l0_l1_cand_idx[comb_idx][1];
MvField l0_cand = mergecandlist[l0_cand_idx];
MvField l1_cand = mergecandlist[l1_cand_idx];
if ((l0_cand.pred_flag & PF_L0) && (l1_cand.pred_flag & PF_L1) &&
(refPicList[0].list[l0_cand.ref_idx[0]] !=
refPicList[1].list[l1_cand.ref_idx[1]] ||
AV_RN32A(&l0_cand.mv[0]) != AV_RN32A(&l1_cand.mv[1]))) {
mergecandlist[nb_merge_cand].ref_idx[0] = l0_cand.ref_idx[0];
mergecandlist[nb_merge_cand].ref_idx[1] = l1_cand.ref_idx[1];
mergecandlist[nb_merge_cand].pred_flag = PF_BI;
AV_COPY32(&mergecandlist[nb_merge_cand].mv[0], &l0_cand.mv[0]);
AV_COPY32(&mergecandlist[nb_merge_cand].mv[1], &l1_cand.mv[1]);
if (merge_idx == nb_merge_cand)
return;
nb_merge_cand++;
}
}
}
// append Zero motion vector candidates
while (nb_merge_cand < s->sh.max_num_merge_cand) {
mergecandlist[nb_merge_cand].pred_flag = PF_L0 + ((s->sh.slice_type == HEVC_SLICE_B) << 1);
AV_ZERO32(mergecandlist[nb_merge_cand].mv + 0);
AV_ZERO32(mergecandlist[nb_merge_cand].mv + 1);
mergecandlist[nb_merge_cand].ref_idx[0] = zero_idx < nb_refs ? zero_idx : 0;
mergecandlist[nb_merge_cand].ref_idx[1] = zero_idx < nb_refs ? zero_idx : 0;
if (merge_idx == nb_merge_cand)
return;
nb_merge_cand++;
zero_idx++;
}
}
/*
* 8.5.3.1.1 Derivation process of luma Mvs for merge mode
*/
void ff_hevc_luma_mv_merge_mode(HEVCLocalContext *lc, const HEVCPPS *pps,
int x0, int y0, int nPbW,
int nPbH, int log2_cb_size, int part_idx,
int merge_idx, MvField *mv)
{
const HEVCSPS *const sps = pps->sps;
const HEVCContext *const s = lc->parent;
int singleMCLFlag = 0;
int nCS = 1 << log2_cb_size;
MvField mergecand_list[MRG_MAX_NUM_CANDS];
int nPbW2 = nPbW;
int nPbH2 = nPbH;
if (pps->log2_parallel_merge_level > 2 && nCS == 8) {
singleMCLFlag = 1;
x0 = lc->cu.x;
y0 = lc->cu.y;
nPbW = nCS;
nPbH = nCS;
part_idx = 0;
}
ff_hevc_set_neighbour_available(lc, x0, y0, nPbW, nPbH, sps->log2_ctb_size);
derive_spatial_merge_candidates(lc, s, pps, sps, x0, y0, nPbW, nPbH, log2_cb_size,
singleMCLFlag, part_idx,
merge_idx, mergecand_list);
if (mergecand_list[merge_idx].pred_flag == PF_BI &&
(nPbW2 + nPbH2) == 12) {
mergecand_list[merge_idx].pred_flag = PF_L0;
}
*mv = mergecand_list[merge_idx];
}
static av_always_inline void dist_scale(const HEVCContext *s, Mv *mv,
int min_pu_width, int x, int y,
int elist, int ref_idx_curr, int ref_idx)
{
const RefPicList *refPicList = s->cur_frame->refPicList;
const MvField *tab_mvf = s->cur_frame->tab_mvf;
int ref_pic_elist = refPicList[elist].list[TAB_MVF(x, y).ref_idx[elist]];
int ref_pic_curr = refPicList[ref_idx_curr].list[ref_idx];
if (ref_pic_elist != ref_pic_curr) {
int poc_diff = s->poc - ref_pic_elist;
if (!poc_diff)
poc_diff = 1;
mv_scale(mv, mv, poc_diff, s->poc - ref_pic_curr);
}
}
static int mv_mp_mode_mx(const HEVCContext *s, const HEVCSPS *sps,
int x, int y, int pred_flag_index,
Mv *mv, int ref_idx_curr, int ref_idx)
{
const MvField *tab_mvf = s->cur_frame->tab_mvf;
int min_pu_width = sps->min_pu_width;
const RefPicList *refPicList = s->cur_frame->refPicList;
if (((TAB_MVF(x, y).pred_flag) & (1 << pred_flag_index)) &&
refPicList[pred_flag_index].list[TAB_MVF(x, y).ref_idx[pred_flag_index]] == refPicList[ref_idx_curr].list[ref_idx]) {
*mv = TAB_MVF(x, y).mv[pred_flag_index];
return 1;
}
return 0;
}
static int mv_mp_mode_mx_lt(const HEVCContext *s, const HEVCSPS *sps,
int x, int y, int pred_flag_index,
Mv *mv, int ref_idx_curr, int ref_idx)
{
const MvField *tab_mvf = s->cur_frame->tab_mvf;
int min_pu_width = sps->min_pu_width;
const RefPicList *refPicList = s->cur_frame->refPicList;
if ((TAB_MVF(x, y).pred_flag) & (1 << pred_flag_index)) {
int currIsLongTerm = refPicList[ref_idx_curr].isLongTerm[ref_idx];
int colIsLongTerm =
refPicList[pred_flag_index].isLongTerm[(TAB_MVF(x, y).ref_idx[pred_flag_index])];
if (colIsLongTerm == currIsLongTerm) {
*mv = TAB_MVF(x, y).mv[pred_flag_index];
if (!currIsLongTerm)
dist_scale(s, mv, min_pu_width, x, y,
pred_flag_index, ref_idx_curr, ref_idx);
return 1;
}
}
return 0;
}
#define MP_MX(v, pred, mx) \
mv_mp_mode_mx(s, sps, \
(x ## v) >> sps->log2_min_pu_size, \
(y ## v) >> sps->log2_min_pu_size, \
pred, &mx, ref_idx_curr, ref_idx)
#define MP_MX_LT(v, pred, mx) \
mv_mp_mode_mx_lt(s, sps, \
(x ## v) >> sps->log2_min_pu_size, \
(y ## v) >> sps->log2_min_pu_size, \
pred, &mx, ref_idx_curr, ref_idx)
void ff_hevc_luma_mv_mvp_mode(HEVCLocalContext *lc, const HEVCPPS *pps,
int x0, int y0, int nPbW,
int nPbH, int log2_cb_size, int part_idx,
int merge_idx, MvField *mv,
int mvp_lx_flag, int LX)
{
const HEVCSPS *const sps = pps->sps;
const HEVCContext *const s = lc->parent;
const MvField *const tab_mvf = s->cur_frame->tab_mvf;
int isScaledFlag_L0 = 0;
int availableFlagLXA0 = 1;
int availableFlagLXB0 = 1;
int numMVPCandLX = 0;
int min_pu_width = sps->min_pu_width;
int xA0, yA0;
int is_available_a0;
int xA1, yA1;
int is_available_a1;
int xB0, yB0;
int is_available_b0;
int xB1, yB1;
int is_available_b1;
int xB2, yB2;
int is_available_b2;
Mv mvpcand_list[2] = { { 0 } };
Mv mxA;
Mv mxB;
int ref_idx_curr;
int ref_idx = 0;
int pred_flag_index_l0;
int pred_flag_index_l1;
const int cand_bottom_left = lc->na.cand_bottom_left;
const int cand_left = lc->na.cand_left;
const int cand_up_left = lc->na.cand_up_left;
const int cand_up = lc->na.cand_up;
const int cand_up_right = lc->na.cand_up_right_sap;
ref_idx_curr = LX;
ref_idx = mv->ref_idx[LX];
pred_flag_index_l0 = LX;
pred_flag_index_l1 = !LX;
// left bottom spatial candidate
xA0 = x0 - 1;
yA0 = y0 + nPbH;
is_available_a0 = AVAILABLE(cand_bottom_left, A0) &&
yA0 < sps->height &&
PRED_BLOCK_AVAILABLE(A0);
//left spatial merge candidate
xA1 = x0 - 1;
yA1 = y0 + nPbH - 1;
is_available_a1 = AVAILABLE(cand_left, A1);
if (is_available_a0 || is_available_a1)
isScaledFlag_L0 = 1;
if (is_available_a0) {
if (MP_MX(A0, pred_flag_index_l0, mxA)) {
goto b_candidates;
}
if (MP_MX(A0, pred_flag_index_l1, mxA)) {
goto b_candidates;
}
}
if (is_available_a1) {
if (MP_MX(A1, pred_flag_index_l0, mxA)) {
goto b_candidates;
}
if (MP_MX(A1, pred_flag_index_l1, mxA)) {
goto b_candidates;
}
}
if (is_available_a0) {
if (MP_MX_LT(A0, pred_flag_index_l0, mxA)) {
goto b_candidates;
}
if (MP_MX_LT(A0, pred_flag_index_l1, mxA)) {
goto b_candidates;
}
}
if (is_available_a1) {
if (MP_MX_LT(A1, pred_flag_index_l0, mxA)) {
goto b_candidates;
}
if (MP_MX_LT(A1, pred_flag_index_l1, mxA)) {
goto b_candidates;
}
}
availableFlagLXA0 = 0;
b_candidates:
// B candidates
// above right spatial merge candidate
xB0 = x0 + nPbW;
yB0 = y0 - 1;
is_available_b0 = AVAILABLE(cand_up_right, B0) &&
xB0 < sps->width &&
PRED_BLOCK_AVAILABLE(B0);
// above spatial merge candidate
xB1 = x0 + nPbW - 1;
yB1 = y0 - 1;
is_available_b1 = AVAILABLE(cand_up, B1);
// above left spatial merge candidate
xB2 = x0 - 1;
yB2 = y0 - 1;
is_available_b2 = AVAILABLE(cand_up_left, B2);
// above right spatial merge candidate
if (is_available_b0) {
if (MP_MX(B0, pred_flag_index_l0, mxB)) {
goto scalef;
}
if (MP_MX(B0, pred_flag_index_l1, mxB)) {
goto scalef;
}
}
// above spatial merge candidate
if (is_available_b1) {
if (MP_MX(B1, pred_flag_index_l0, mxB)) {
goto scalef;
}
if (MP_MX(B1, pred_flag_index_l1, mxB)) {
goto scalef;
}
}
// above left spatial merge candidate
if (is_available_b2) {
if (MP_MX(B2, pred_flag_index_l0, mxB)) {
goto scalef;
}
if (MP_MX(B2, pred_flag_index_l1, mxB)) {
goto scalef;
}
}
availableFlagLXB0 = 0;
scalef:
if (!isScaledFlag_L0) {
if (availableFlagLXB0) {
availableFlagLXA0 = 1;
mxA = mxB;
}
availableFlagLXB0 = 0;
// XB0 and L1
if (is_available_b0) {
availableFlagLXB0 = MP_MX_LT(B0, pred_flag_index_l0, mxB);
if (!availableFlagLXB0)
availableFlagLXB0 = MP_MX_LT(B0, pred_flag_index_l1, mxB);
}
if (is_available_b1 && !availableFlagLXB0) {
availableFlagLXB0 = MP_MX_LT(B1, pred_flag_index_l0, mxB);
if (!availableFlagLXB0)
availableFlagLXB0 = MP_MX_LT(B1, pred_flag_index_l1, mxB);
}
if (is_available_b2 && !availableFlagLXB0) {
availableFlagLXB0 = MP_MX_LT(B2, pred_flag_index_l0, mxB);
if (!availableFlagLXB0)
availableFlagLXB0 = MP_MX_LT(B2, pred_flag_index_l1, mxB);
}
}
if (availableFlagLXA0)
mvpcand_list[numMVPCandLX++] = mxA;
if (availableFlagLXB0 && (!availableFlagLXA0 || mxA.x != mxB.x || mxA.y != mxB.y))
mvpcand_list[numMVPCandLX++] = mxB;
//temporal motion vector prediction candidate
if (numMVPCandLX < 2 && s->sh.slice_temporal_mvp_enabled_flag &&
mvp_lx_flag == numMVPCandLX) {
Mv mv_col;
int available_col = temporal_luma_motion_vector(s, sps, x0, y0, nPbW,
nPbH, ref_idx,
&mv_col, LX);
if (available_col)
mvpcand_list[numMVPCandLX++] = mv_col;
}
mv->mv[LX] = mvpcand_list[mvp_lx_flag];
}
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