lavc/hevc*: move to hevc/ subdir

1 files changed, 775 insertions, 0 deletions

diff --git a/libavcodec/hevc/mvs.c b/libavcodec/hevc/mvs.c
new file mode 100644
index 0000000000..b56f0bece5
--- /dev/null
+++ b/libavcodec/hevc/mvs.c
@@ -0,0 +1,775 @@
+/*
+ * 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)
+{
+    const HEVCContext *const s = lc->parent;
+    int x0b = av_mod_uintp2(x0, s->ps.sps->log2_ctb_size);
+    int y0b = av_mod_uintp2(y0, s->ps.sps->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 << s->ps.sps->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 HEVCContext *s, int xCurr, int yCurr,
+                              int xN, int yN)
+{
+#define MIN_TB_ADDR_ZS(x, y)                                            \
+    s->ps.pps->min_tb_addr_zs[(y) * (s->ps.sps->tb_mask+2) + (x)]
+
+    int xCurr_ctb = xCurr >> s->ps.sps->log2_ctb_size;
+    int yCurr_ctb = yCurr >> s->ps.sps->log2_ctb_size;
+    int xN_ctb    = xN    >> s->ps.sps->log2_ctb_size;
+    int yN_ctb    = yN    >> s->ps.sps->log2_ctb_size;
+    if( yN_ctb < yCurr_ctb || xN_ctb < xCurr_ctb )
+        return 1;
+    else {
+        int Curr = MIN_TB_ADDR_ZS((xCurr >> s->ps.sps->log2_min_tb_size) & s->ps.sps->tb_mask,
+                (yCurr >> s->ps.sps->log2_min_tb_size) & s->ps.sps->tb_mask);
+        int N    = MIN_TB_ADDR_ZS((xN >> s->ps.sps->log2_min_tb_size) & s->ps.sps->tb_mask,
+                (yN >> s->ps.sps->log2_min_tb_size) & s->ps.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 HEVCContext *s, int xN, int yN, int xP, int yP)
+{
+    uint8_t plevel = s->ps.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) >> s->ps.sps->log2_min_pu_size),                     \
+            ((y ## v) >> s->ps.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(s, ref, x, y))
+
+/*
+ * 8.5.3.1.7  temporal luma motion vector prediction
+ */
+static int temporal_luma_motion_vector(const HEVCContext *s, 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 = s->ps.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 >> s->ps.sps->log2_ctb_size) == (y >> s->ps.sps->log2_ctb_size) &&
+        y < s->ps.sps->height &&
+        x < s->ps.sps->width) {
+        x                 &= ~15;
+        y                 &= ~15;
+        if (s->threads_type == FF_THREAD_FRAME)
+            ff_progress_frame_await(&ref->tf, y);
+        x_pu               = x >> s->ps.sps->log2_min_pu_size;
+        y_pu               = y >> s->ps.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->threads_type == FF_THREAD_FRAME)
+            ff_progress_frame_await(&ref->tf, y);
+        x_pu               = x >> s->ps.sps->log2_min_pu_size;
+        y_pu               = y >> s->ps.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(s, 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,
+                                            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 = s->ps.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(s, 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(s, 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 < s->ps.sps->width &&
+                      PRED_BLOCK_AVAILABLE(B0) &&
+                      !is_diff_mer(s, 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 < s->ps.sps->height &&
+                      PRED_BLOCK_AVAILABLE(A0) &&
+                      !is_diff_mer(s, 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(s, 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, x0, y0, nPbW, nPbH,
+                                                       0, &mv_l0_col, 0);
+        int available_l1 = (s->sh.slice_type == HEVC_SLICE_B) ?
+                           temporal_luma_motion_vector(s, 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, int x0, int y0, int nPbW,
+                                int nPbH, int log2_cb_size, int part_idx,
+                                int merge_idx, MvField *mv)
+{
+    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 (s->ps.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);
+    derive_spatial_merge_candidates(lc, s, 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, 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 = s->ps.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, 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 = s->ps.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,                                            \
+                  (x ## v) >> s->ps.sps->log2_min_pu_size,         \
+                  (y ## v) >> s->ps.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,                                         \
+                     (x ## v) >> s->ps.sps->log2_min_pu_size,      \
+                     (y ## v) >> s->ps.sps->log2_min_pu_size,      \
+                     pred, &mx, ref_idx_curr, ref_idx)
+
+void ff_hevc_luma_mv_mvp_mode(HEVCLocalContext *lc, 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 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 = s->ps.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 < s->ps.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 < s->ps.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, 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];
+}