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FFmpeg/libavcodec/hevc_mvs.c

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  1. /*

  2.  * HEVC video decoder

  3.  *

  4.  * Copyright (C) 2012 - 2013 Guillaume Martres

  5.  * Copyright (C) 2013 Anand Meher Kotra

  6.  *

  7.  * This file is part of FFmpeg.

  8.  *

  9.  * FFmpeg is free software; you can redistribute it and/or

  10.  * modify it under the terms of the GNU Lesser General Public

  11.  * License as published by the Free Software Foundation; either

  12.  * version 2.1 of the License, or (at your option) any later version.

  13.  *

  14.  * FFmpeg is distributed in the hope that it will be useful,

  15.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  16.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  17.  * Lesser General Public License for more details.

  18.  *

  19.  * You should have received a copy of the GNU Lesser General Public

  20.  * License along with FFmpeg; if not, write to the Free Software

  21.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  22.  */

  23. 

  24. #include "hevc.h"

  25. 

  26. static const uint8_t l0_l1_cand_idx[12][2] = {

  27.     { 0, 1, },

  28.     { 1, 0, },

  29.     { 0, 2, },

  30.     { 2, 0, },

  31.     { 1, 2, },

  32.     { 2, 1, },

  33.     { 0, 3, },

  34.     { 3, 0, },

  35.     { 1, 3, },

  36.     { 3, 1, },

  37.     { 2, 3, },

  38.     { 3, 2, },

  39. };

  40. 

  41. void ff_hevc_set_neighbour_available(HEVCContext *s, int x0, int y0,

  42.                                      int nPbW, int nPbH)

  43. {

  44.     HEVCLocalContext *lc = s->HEVClc;

  45.     int x0b = av_mod_uintp2(x0, s->ps.sps->log2_ctb_size);

  46.     int y0b = av_mod_uintp2(y0, s->ps.sps->log2_ctb_size);

  47. 

  48.     lc->na.cand_up       = (lc->ctb_up_flag   || y0b);

  49.     lc->na.cand_left     = (lc->ctb_left_flag || x0b);

  50.     lc->na.cand_up_left  = (!x0b && !y0b) ? lc->ctb_up_left_flag : lc->na.cand_left && lc->na.cand_up;

  51.     lc->na.cand_up_right_sap =

  52.             ((x0b + nPbW) == (1 << s->ps.sps->log2_ctb_size)) ?

  53.                     lc->ctb_up_right_flag && !y0b : lc->na.cand_up;

  54.     lc->na.cand_up_right =

  55.             lc->na.cand_up_right_sap

  56.                      && (x0 + nPbW) < lc->end_of_tiles_x;

  57.     lc->na.cand_bottom_left = ((y0 + nPbH) >= lc->end_of_tiles_y) ? 0 : lc->na.cand_left;

  58. }

  59. 

  60. /*

  61.  * 6.4.1 Derivation process for z-scan order block availability

  62.  */

  63. static av_always_inline int z_scan_block_avail(HEVCContext *s, int xCurr, int yCurr,

  64.                               int xN, int yN)

  65. {

  66. #define MIN_TB_ADDR_ZS(x, y)                                            \

  67.     s->ps.pps->min_tb_addr_zs[(y) * (s->ps.sps->tb_mask+2) + (x)]

  68. 

  69.     int xCurr_ctb = xCurr >> s->ps.sps->log2_ctb_size;

  70.     int yCurr_ctb = yCurr >> s->ps.sps->log2_ctb_size;

  71.     int xN_ctb    = xN    >> s->ps.sps->log2_ctb_size;

  72.     int yN_ctb    = yN    >> s->ps.sps->log2_ctb_size;

  73.     if( yN_ctb < yCurr_ctb || xN_ctb < xCurr_ctb )

  74.         return 1;

  75.     else {

  76.         int Curr = MIN_TB_ADDR_ZS((xCurr >> s->ps.sps->log2_min_tb_size) & s->ps.sps->tb_mask,

  77.                 (yCurr >> s->ps.sps->log2_min_tb_size) & s->ps.sps->tb_mask);

  78.         int N    = MIN_TB_ADDR_ZS((xN >> s->ps.sps->log2_min_tb_size) & s->ps.sps->tb_mask,

  79.                 (yN >> s->ps.sps->log2_min_tb_size) & s->ps.sps->tb_mask);

  80.         return N <= Curr;

  81.     }

  82. }

  83. 

  84. //check if the two luma locations belong to the same motion estimation region

  85. static av_always_inline int is_diff_mer(HEVCContext *s, int xN, int yN, int xP, int yP)

  86. {

  87.     uint8_t plevel = s->ps.pps->log2_parallel_merge_level;

  88. 

  89.     return xN >> plevel == xP >> plevel &&

  90.            yN >> plevel == yP >> plevel;

  91. }

  92. 

  93. #define MATCH_MV(x) (AV_RN32A(&A.x) == AV_RN32A(&B.x))

  94. #define MATCH(x) (A.x == B.x)

  95. 

  96. // check if the mv's and refidx are the same between A and B

  97. static av_always_inline int compare_mv_ref_idx(struct MvField A, struct MvField B)

  98. {

  99.     int a_pf = A.pred_flag;

  100.     int b_pf = B.pred_flag;

  101.     if (a_pf == b_pf) {

  102.         if (a_pf == PF_BI) {

  103.             return MATCH(ref_idx[0]) && MATCH_MV(mv[0]) &&

  104.                    MATCH(ref_idx[1]) && MATCH_MV(mv[1]);

  105.         } else if (a_pf == PF_L0) {

  106.             return MATCH(ref_idx[0]) && MATCH_MV(mv[0]);

  107.         } else if (a_pf == PF_L1) {

  108.             return MATCH(ref_idx[1]) && MATCH_MV(mv[1]);

  109.         }

  110.     }

  111.     return 0;

  112. }

  113. 

  114. static av_always_inline void mv_scale(Mv *dst, Mv *src, int td, int tb)

  115. {

  116.     int tx, scale_factor;

  117. 

  118.     td = av_clip_int8(td);

  119.     tb = av_clip_int8(tb);

  120.     tx = (0x4000 + abs(td / 2)) / td;

  121.     scale_factor = av_clip_intp2((tb * tx + 32) >> 6, 12);

  122.     dst->x = av_clip_int16((scale_factor * src->x + 127 +

  123.                            (scale_factor * src->x < 0)) >> 8);

  124.     dst->y = av_clip_int16((scale_factor * src->y + 127 +

  125.                            (scale_factor * src->y < 0)) >> 8);

  126. }

  127. 

  128. static int check_mvset(Mv *mvLXCol, Mv *mvCol,

  129.                        int colPic, int poc,

  130.                        RefPicList *refPicList, int X, int refIdxLx,

  131.                        RefPicList *refPicList_col, int listCol, int refidxCol)

  132. {

  133.     int cur_lt = refPicList[X].isLongTerm[refIdxLx];

  134.     int col_lt = refPicList_col[listCol].isLongTerm[refidxCol];

  135.     int col_poc_diff, cur_poc_diff;

  136. 

  137.     if (cur_lt != col_lt) {

  138.         mvLXCol->x = 0;

  139.         mvLXCol->y = 0;

  140.         return 0;

  141.     }

  142. 

  143.     col_poc_diff = colPic - refPicList_col[listCol].list[refidxCol];

  144.     cur_poc_diff = poc    - refPicList[X].list[refIdxLx];

  145. 

  146.     if (cur_lt || col_poc_diff == cur_poc_diff || !col_poc_diff) {

  147.         mvLXCol->x = mvCol->x;

  148.         mvLXCol->y = mvCol->y;

  149.     } else {

  150.         mv_scale(mvLXCol, mvCol, col_poc_diff, cur_poc_diff);

  151.     }

  152.     return 1;

  153. }

  154. 

  155. #define CHECK_MVSET(l)                                          \

  156.     check_mvset(mvLXCol, temp_col.mv + l,                       \

  157.                 colPic, s->poc,                                 \

  158.                 refPicList, X, refIdxLx,                        \

  159.                 refPicList_col, L ## l, temp_col.ref_idx[l])

  160. 

  161. // derive the motion vectors section 8.5.3.1.8

  162. static int derive_temporal_colocated_mvs(HEVCContext *s, MvField temp_col,

  163.                                          int refIdxLx, Mv *mvLXCol, int X,

  164.                                          int colPic, RefPicList *refPicList_col)

  165. {

  166.     RefPicList *refPicList = s->ref->refPicList;

  167. 

  168.     if (temp_col.pred_flag == PF_INTRA)

  169.         return 0;

  170. 

  171.     if (!(temp_col.pred_flag & PF_L0))

  172.         return CHECK_MVSET(1);

  173.     else if (temp_col.pred_flag == PF_L0)

  174.         return CHECK_MVSET(0);

  175.     else if (temp_col.pred_flag == PF_BI) {

  176.         int check_diffpicount = 0;

  177.         int i, j;

  178.         for (j = 0; j < 2; j++) {

  179.             for (i = 0; i < refPicList[j].nb_refs; i++) {

  180.                 if (refPicList[j].list[i] > s->poc) {

  181.                     check_diffpicount++;

  182.                     break;

  183.                 }

  184.             }

  185.         }

  186.         if (!check_diffpicount) {

  187.             if (X==0)

  188.                 return CHECK_MVSET(0);

  189.             else

  190.                 return CHECK_MVSET(1);

  191.         } else {

  192.             if (s->sh.collocated_list == L1)

  193.                 return CHECK_MVSET(0);

  194.             else

  195.                 return CHECK_MVSET(1);

  196.         }

  197.     }

  198. 

  199.     return 0;

  200. }

  201. 

  202. #define TAB_MVF(x, y)                                                   \

  203.     tab_mvf[(y) * min_pu_width + x]

  204. 

  205. #define TAB_MVF_PU(v)                                                   \

  206.     TAB_MVF(((x ## v) >> s->ps.sps->log2_min_pu_size),                     \

  207.             ((y ## v) >> s->ps.sps->log2_min_pu_size))

  208. 

  209. #define DERIVE_TEMPORAL_COLOCATED_MVS                                   \

  210.     derive_temporal_colocated_mvs(s, temp_col,                          \

  211.                                   refIdxLx, mvLXCol, X, colPic,         \

  212.                                   ff_hevc_get_ref_list(s, ref, x, y))

  213. 

  214. /*

  215.  * 8.5.3.1.7  temporal luma motion vector prediction

  216.  */

  217. static int temporal_luma_motion_vector(HEVCContext *s, int x0, int y0,

  218.                                        int nPbW, int nPbH, int refIdxLx,

  219.                                        Mv *mvLXCol, int X)

  220. {

  221.     MvField *tab_mvf;

  222.     MvField temp_col;

  223.     int x, y, x_pu, y_pu;

  224.     int min_pu_width = s->ps.sps->min_pu_width;

  225.     int availableFlagLXCol = 0;

  226.     int colPic;

  227. 

  228.     HEVCFrame *ref = s->ref->collocated_ref;

  229. 

  230.     if (!ref) {

  231.         memset(mvLXCol, 0, sizeof(*mvLXCol));

  232.         return 0;

  233.     }

  234. 

  235.     tab_mvf = ref->tab_mvf;

  236.     colPic  = ref->poc;

  237. 

  238.     //bottom right collocated motion vector

  239.     x = x0 + nPbW;

  240.     y = y0 + nPbH;

  241. 

  242.     if (tab_mvf &&

  243.         (y0 >> s->ps.sps->log2_ctb_size) == (y >> s->ps.sps->log2_ctb_size) &&

  244.         y < s->ps.sps->height &&

  245.         x < s->ps.sps->width) {

  246.         x                 &= ~15;

  247.         y                 &= ~15;

  248.         if (s->threads_type == FF_THREAD_FRAME)

  249.             ff_thread_await_progress(&ref->tf, y, 0);

  250.         x_pu               = x >> s->ps.sps->log2_min_pu_size;

  251.         y_pu               = y >> s->ps.sps->log2_min_pu_size;

  252.         temp_col           = TAB_MVF(x_pu, y_pu);

  253.         availableFlagLXCol = DERIVE_TEMPORAL_COLOCATED_MVS;

  254.     }

  255. 

  256.     // derive center collocated motion vector

  257.     if (tab_mvf && !availableFlagLXCol) {

  258.         x                  = x0 + (nPbW >> 1);

  259.         y                  = y0 + (nPbH >> 1);

  260.         x                 &= ~15;

  261.         y                 &= ~15;

  262.         if (s->threads_type == FF_THREAD_FRAME)

  263.             ff_thread_await_progress(&ref->tf, y, 0);

  264.         x_pu               = x >> s->ps.sps->log2_min_pu_size;

  265.         y_pu               = y >> s->ps.sps->log2_min_pu_size;

  266.         temp_col           = TAB_MVF(x_pu, y_pu);

  267.         availableFlagLXCol = DERIVE_TEMPORAL_COLOCATED_MVS;

  268.     }

  269.     return availableFlagLXCol;

  270. }

  271. 

  272. #define AVAILABLE(cand, v)                                      \

  273.     (cand && !(TAB_MVF_PU(v).pred_flag == PF_INTRA))

  274. 

  275. #define PRED_BLOCK_AVAILABLE(v)                                 \

  276.     z_scan_block_avail(s, x0, y0, x ## v, y ## v)

  277. 

  278. #define COMPARE_MV_REFIDX(a, b)                                 \

  279.     compare_mv_ref_idx(TAB_MVF_PU(a), TAB_MVF_PU(b))

  280. 

  281. /*

  282.  * 8.5.3.1.2  Derivation process for spatial merging candidates

  283.  */

  284. static void derive_spatial_merge_candidates(HEVCContext *s, int x0, int y0,

  285.                                             int nPbW, int nPbH,

  286.                                             int log2_cb_size,

  287.                                             int singleMCLFlag, int part_idx,

  288.                                             int merge_idx,

  289.                                             struct MvField mergecandlist[])

  290. {

  291.     HEVCLocalContext *lc   = s->HEVClc;

  292.     RefPicList *refPicList = s->ref->refPicList;

  293.     MvField *tab_mvf       = s->ref->tab_mvf;

  294. 

  295.     const int min_pu_width = s->ps.sps->min_pu_width;

  296. 

  297.     const int cand_bottom_left = lc->na.cand_bottom_left;

  298.     const int cand_left        = lc->na.cand_left;

  299.     const int cand_up_left     = lc->na.cand_up_left;

  300.     const int cand_up          = lc->na.cand_up;

  301.     const int cand_up_right    = lc->na.cand_up_right_sap;

  302. 

  303.     const int xA1    = x0 - 1;

  304.     const int yA1    = y0 + nPbH - 1;

  305. 

  306.     const int xB1    = x0 + nPbW - 1;

  307.     const int yB1    = y0 - 1;

  308. 

  309.     const int xB0    = x0 + nPbW;

  310.     const int yB0    = y0 - 1;

  311. 

  312.     const int xA0    = x0 - 1;

  313.     const int yA0    = y0 + nPbH;

  314. 

  315.     const int xB2    = x0 - 1;

  316.     const int yB2    = y0 - 1;

  317. 

  318.     const int nb_refs = (s->sh.slice_type == P_SLICE) ?

  319.                         s->sh.nb_refs[0] : FFMIN(s->sh.nb_refs[0], s->sh.nb_refs[1]);

  320. 

  321.     int zero_idx = 0;

  322. 

  323.     int nb_merge_cand = 0;

  324.     int nb_orig_merge_cand = 0;

  325. 

  326.     int is_available_a0;

  327.     int is_available_a1;

  328.     int is_available_b0;

  329.     int is_available_b1;

  330.     int is_available_b2;

  331. 

  332. 

  333.     if (!singleMCLFlag && part_idx == 1 &&

  334.         (lc->cu.part_mode == PART_Nx2N ||

  335.          lc->cu.part_mode == PART_nLx2N ||

  336.          lc->cu.part_mode == PART_nRx2N) ||

  337.         is_diff_mer(s, xA1, yA1, x0, y0)) {

  338.         is_available_a1 = 0;

  339.     } else {

  340.         is_available_a1 = AVAILABLE(cand_left, A1);

  341.         if (is_available_a1) {

  342.             mergecandlist[nb_merge_cand] = TAB_MVF_PU(A1);

  343.             if (merge_idx == 0)

  344.                 return;

  345.             nb_merge_cand++;

  346.         }

  347.     }

  348. 

  349.     if (!singleMCLFlag && part_idx == 1 &&

  350.         (lc->cu.part_mode == PART_2NxN ||

  351.          lc->cu.part_mode == PART_2NxnU ||

  352.          lc->cu.part_mode == PART_2NxnD) ||

  353.         is_diff_mer(s, xB1, yB1, x0, y0)) {

  354.         is_available_b1 = 0;

  355.     } else {

  356.         is_available_b1 = AVAILABLE(cand_up, B1);

  357.         if (is_available_b1 &&

  358.             !(is_available_a1 && COMPARE_MV_REFIDX(B1, A1))) {

  359.             mergecandlist[nb_merge_cand] = TAB_MVF_PU(B1);

  360.             if (merge_idx == nb_merge_cand)

  361.                 return;

  362.             nb_merge_cand++;

  363.         }

  364.     }

  365. 

  366.     // above right spatial merge candidate

  367.     is_available_b0 = AVAILABLE(cand_up_right, B0) &&

  368.                       xB0 < s->ps.sps->width &&

  369.                       PRED_BLOCK_AVAILABLE(B0) &&

  370.                       !is_diff_mer(s, xB0, yB0, x0, y0);

  371. 

  372.     if (is_available_b0 &&

  373.         !(is_available_b1 && COMPARE_MV_REFIDX(B0, B1))) {

  374.         mergecandlist[nb_merge_cand] = TAB_MVF_PU(B0);

  375.         if (merge_idx == nb_merge_cand)

  376.             return;

  377.         nb_merge_cand++;

  378.     }

  379. 

  380.     // left bottom spatial merge candidate

  381.     is_available_a0 = AVAILABLE(cand_bottom_left, A0) &&

  382.                       yA0 < s->ps.sps->height &&

  383.                       PRED_BLOCK_AVAILABLE(A0) &&

  384.                       !is_diff_mer(s, xA0, yA0, x0, y0);

  385. 

  386.     if (is_available_a0 &&

  387.         !(is_available_a1 && COMPARE_MV_REFIDX(A0, A1))) {

  388.         mergecandlist[nb_merge_cand] = TAB_MVF_PU(A0);

  389.         if (merge_idx == nb_merge_cand)

  390.             return;

  391.         nb_merge_cand++;

  392.     }

  393. 

  394.     // above left spatial merge candidate

  395.     is_available_b2 = AVAILABLE(cand_up_left, B2) &&

  396.                       !is_diff_mer(s, xB2, yB2, x0, y0);

  397. 

  398.     if (is_available_b2 &&

  399.         !(is_available_a1 && COMPARE_MV_REFIDX(B2, A1)) &&

  400.         !(is_available_b1 && COMPARE_MV_REFIDX(B2, B1)) &&

  401.         nb_merge_cand != 4) {

  402.         mergecandlist[nb_merge_cand] = TAB_MVF_PU(B2);

  403.         if (merge_idx == nb_merge_cand)

  404.             return;

  405.         nb_merge_cand++;

  406.     }

  407. 

  408.     // temporal motion vector candidate

  409.     if (s->sh.slice_temporal_mvp_enabled_flag &&

  410.         nb_merge_cand < s->sh.max_num_merge_cand) {

  411.         Mv mv_l0_col = { 0 }, mv_l1_col = { 0 };

  412.         int available_l0 = temporal_luma_motion_vector(s, x0, y0, nPbW, nPbH,

  413.                                                        0, &mv_l0_col, 0);

  414.         int available_l1 = (s->sh.slice_type == B_SLICE) ?

  415.                            temporal_luma_motion_vector(s, x0, y0, nPbW, nPbH,

  416.                                                        0, &mv_l1_col, 1) : 0;

  417. 

  418.         if (available_l0 || available_l1) {

  419.             mergecandlist[nb_merge_cand].pred_flag = available_l0 + (available_l1 << 1);

  420.             AV_ZERO16(mergecandlist[nb_merge_cand].ref_idx);

  421.             mergecandlist[nb_merge_cand].mv[0]      = mv_l0_col;

  422.             mergecandlist[nb_merge_cand].mv[1]      = mv_l1_col;

  423. 

  424.             if (merge_idx == nb_merge_cand)

  425.                 return;

  426.             nb_merge_cand++;

  427.         }

  428.     }

  429. 

  430.     nb_orig_merge_cand = nb_merge_cand;

  431. 

  432.     // combined bi-predictive merge candidates  (applies for B slices)

  433.     if (s->sh.slice_type == B_SLICE && nb_orig_merge_cand > 1 &&

  434.         nb_orig_merge_cand < s->sh.max_num_merge_cand) {

  435.         int comb_idx = 0;

  436. 

  437.         for (comb_idx = 0; nb_merge_cand < s->sh.max_num_merge_cand &&

  438.                            comb_idx < nb_orig_merge_cand * (nb_orig_merge_cand - 1); comb_idx++) {

  439.             int l0_cand_idx = l0_l1_cand_idx[comb_idx][0];

  440.             int l1_cand_idx = l0_l1_cand_idx[comb_idx][1];

  441.             MvField l0_cand = mergecandlist[l0_cand_idx];

  442.             MvField l1_cand = mergecandlist[l1_cand_idx];

  443. 

  444.             if ((l0_cand.pred_flag & PF_L0) && (l1_cand.pred_flag & PF_L1) &&

  445.                 (refPicList[0].list[l0_cand.ref_idx[0]] !=

  446.                  refPicList[1].list[l1_cand.ref_idx[1]] ||

  447.                  AV_RN32A(&l0_cand.mv[0]) != AV_RN32A(&l1_cand.mv[1]))) {

  448.                 mergecandlist[nb_merge_cand].ref_idx[0]   = l0_cand.ref_idx[0];

  449.                 mergecandlist[nb_merge_cand].ref_idx[1]   = l1_cand.ref_idx[1];

  450.                 mergecandlist[nb_merge_cand].pred_flag    = PF_BI;

  451.                 AV_COPY32(&mergecandlist[nb_merge_cand].mv[0], &l0_cand.mv[0]);

  452.                 AV_COPY32(&mergecandlist[nb_merge_cand].mv[1], &l1_cand.mv[1]);

  453.                 if (merge_idx == nb_merge_cand)

  454.                     return;

  455.                 nb_merge_cand++;

  456.             }

  457.         }

  458.     }

  459. 

  460.     // append Zero motion vector candidates

  461.     while (nb_merge_cand < s->sh.max_num_merge_cand) {

  462.         mergecandlist[nb_merge_cand].pred_flag    = PF_L0 + ((s->sh.slice_type == B_SLICE) << 1);

  463.         AV_ZERO32(mergecandlist[nb_merge_cand].mv + 0);

  464.         AV_ZERO32(mergecandlist[nb_merge_cand].mv + 1);

  465.         mergecandlist[nb_merge_cand].ref_idx[0]   = zero_idx < nb_refs ? zero_idx : 0;

  466.         mergecandlist[nb_merge_cand].ref_idx[1]   = zero_idx < nb_refs ? zero_idx : 0;

  467. 

  468.         if (merge_idx == nb_merge_cand)

  469.             return;

  470.         nb_merge_cand++;

  471.         zero_idx++;

  472.     }

  473. }

  474. 

  475. /*

  476.  * 8.5.3.1.1 Derivation process of luma Mvs for merge mode

  477.  */

  478. void ff_hevc_luma_mv_merge_mode(HEVCContext *s, int x0, int y0, int nPbW,

  479.                                 int nPbH, int log2_cb_size, int part_idx,

  480.                                 int merge_idx, MvField *mv)

  481. {

  482.     int singleMCLFlag = 0;

  483.     int nCS = 1 << log2_cb_size;

  484.     LOCAL_ALIGNED(4, MvField, mergecand_list, [MRG_MAX_NUM_CANDS]);

  485.     int nPbW2 = nPbW;

  486.     int nPbH2 = nPbH;

  487.     HEVCLocalContext *lc = s->HEVClc;

  488. 

  489.     if (s->ps.pps->log2_parallel_merge_level > 2 && nCS == 8) {

  490.         singleMCLFlag = 1;

  491.         x0            = lc->cu.x;

  492.         y0            = lc->cu.y;

  493.         nPbW          = nCS;

  494.         nPbH          = nCS;

  495.         part_idx      = 0;

  496.     }

  497. 

  498.     ff_hevc_set_neighbour_available(s, x0, y0, nPbW, nPbH);

  499.     derive_spatial_merge_candidates(s, x0, y0, nPbW, nPbH, log2_cb_size,

  500.                                     singleMCLFlag, part_idx,

  501.                                     merge_idx, mergecand_list);

  502. 

  503.     if (mergecand_list[merge_idx].pred_flag == PF_BI &&

  504.         (nPbW2 + nPbH2) == 12) {

  505.         mergecand_list[merge_idx].pred_flag = PF_L0;

  506.     }

  507. 

  508.     *mv = mergecand_list[merge_idx];

  509. }

  510. 

  511. static av_always_inline void dist_scale(HEVCContext *s, Mv *mv,

  512.                                         int min_pu_width, int x, int y,

  513.                                         int elist, int ref_idx_curr, int ref_idx)

  514. {

  515.     RefPicList *refPicList = s->ref->refPicList;

  516.     MvField *tab_mvf       = s->ref->tab_mvf;

  517.     int ref_pic_elist      = refPicList[elist].list[TAB_MVF(x, y).ref_idx[elist]];

  518.     int ref_pic_curr       = refPicList[ref_idx_curr].list[ref_idx];

  519. 

  520.     if (ref_pic_elist != ref_pic_curr) {

  521.         int poc_diff = s->poc - ref_pic_elist;

  522.         if (!poc_diff)

  523.             poc_diff = 1;

  524.         mv_scale(mv, mv, poc_diff, s->poc - ref_pic_curr);

  525.     }

  526. }

  527. 

  528. static int mv_mp_mode_mx(HEVCContext *s, int x, int y, int pred_flag_index,

  529.                          Mv *mv, int ref_idx_curr, int ref_idx)

  530. {

  531.     MvField *tab_mvf = s->ref->tab_mvf;

  532.     int min_pu_width = s->ps.sps->min_pu_width;

  533. 

  534.     RefPicList *refPicList = s->ref->refPicList;

  535. 

  536.     if (((TAB_MVF(x, y).pred_flag) & (1 << pred_flag_index)) &&

  537.         refPicList[pred_flag_index].list[TAB_MVF(x, y).ref_idx[pred_flag_index]] == refPicList[ref_idx_curr].list[ref_idx]) {

  538.         *mv = TAB_MVF(x, y).mv[pred_flag_index];

  539.         return 1;

  540.     }

  541.     return 0;

  542. }

  543. 

  544. static int mv_mp_mode_mx_lt(HEVCContext *s, int x, int y, int pred_flag_index,

  545.                             Mv *mv, int ref_idx_curr, int ref_idx)

  546. {

  547.     MvField *tab_mvf = s->ref->tab_mvf;

  548.     int min_pu_width = s->ps.sps->min_pu_width;

  549. 

  550.     RefPicList *refPicList = s->ref->refPicList;

  551. 

  552.     if ((TAB_MVF(x, y).pred_flag) & (1 << pred_flag_index)) {

  553.         int currIsLongTerm     = refPicList[ref_idx_curr].isLongTerm[ref_idx];

  554. 

  555.         int colIsLongTerm =

  556.             refPicList[pred_flag_index].isLongTerm[(TAB_MVF(x, y).ref_idx[pred_flag_index])];

  557. 

  558.         if (colIsLongTerm == currIsLongTerm) {

  559.             *mv = TAB_MVF(x, y).mv[pred_flag_index];

  560.             if (!currIsLongTerm)

  561.                 dist_scale(s, mv, min_pu_width, x, y,

  562.                            pred_flag_index, ref_idx_curr, ref_idx);

  563.             return 1;

  564.         }

  565.     }

  566.     return 0;

  567. }

  568. 

  569. #define MP_MX(v, pred, mx)                                      \

  570.     mv_mp_mode_mx(s,                                            \

  571.                   (x ## v) >> s->ps.sps->log2_min_pu_size,         \

  572.                   (y ## v) >> s->ps.sps->log2_min_pu_size,         \

  573.                   pred, &mx, ref_idx_curr, ref_idx)

  574. 

  575. #define MP_MX_LT(v, pred, mx)                                   \

  576.     mv_mp_mode_mx_lt(s,                                         \

  577.                      (x ## v) >> s->ps.sps->log2_min_pu_size,      \

  578.                      (y ## v) >> s->ps.sps->log2_min_pu_size,      \

  579.                      pred, &mx, ref_idx_curr, ref_idx)

  580. 

  581. void ff_hevc_luma_mv_mvp_mode(HEVCContext *s, int x0, int y0, int nPbW,

  582.                               int nPbH, int log2_cb_size, int part_idx,

  583.                               int merge_idx, MvField *mv,

  584.                               int mvp_lx_flag, int LX)

  585. {

  586.     HEVCLocalContext *lc = s->HEVClc;

  587.     MvField *tab_mvf = s->ref->tab_mvf;

  588.     int isScaledFlag_L0 = 0;

  589.     int availableFlagLXA0 = 1;

  590.     int availableFlagLXB0 = 1;

  591.     int numMVPCandLX = 0;

  592.     int min_pu_width = s->ps.sps->min_pu_width;

  593. 

  594.     int xA0, yA0;

  595.     int is_available_a0;

  596.     int xA1, yA1;

  597.     int is_available_a1;

  598.     int xB0, yB0;

  599.     int is_available_b0;

  600.     int xB1, yB1;

  601.     int is_available_b1;

  602.     int xB2, yB2;

  603.     int is_available_b2;

  604. 

  605.     Mv mvpcand_list[2] = { { 0 } };

  606.     Mv mxA;

  607.     Mv mxB;

  608.     int ref_idx_curr;

  609.     int ref_idx = 0;

  610.     int pred_flag_index_l0;

  611.     int pred_flag_index_l1;

  612. 

  613.     const int cand_bottom_left = lc->na.cand_bottom_left;

  614.     const int cand_left        = lc->na.cand_left;

  615.     const int cand_up_left     = lc->na.cand_up_left;

  616.     const int cand_up          = lc->na.cand_up;

  617.     const int cand_up_right    = lc->na.cand_up_right_sap;

  618.     ref_idx_curr       = LX;

  619.     ref_idx            = mv->ref_idx[LX];

  620.     pred_flag_index_l0 = LX;

  621.     pred_flag_index_l1 = !LX;

  622. 

  623.     // left bottom spatial candidate

  624.     xA0 = x0 - 1;

  625.     yA0 = y0 + nPbH;

  626. 

  627.     is_available_a0 = AVAILABLE(cand_bottom_left, A0) &&

  628.                       yA0 < s->ps.sps->height &&

  629.                       PRED_BLOCK_AVAILABLE(A0);

  630. 

  631.     //left spatial merge candidate

  632.     xA1    = x0 - 1;

  633.     yA1    = y0 + nPbH - 1;

  634. 

  635.     is_available_a1 = AVAILABLE(cand_left, A1);

  636.     if (is_available_a0 || is_available_a1)

  637.         isScaledFlag_L0 = 1;

  638. 

  639.     if (is_available_a0) {

  640.         if (MP_MX(A0, pred_flag_index_l0, mxA)) {

  641.             goto b_candidates;

  642.         }

  643.         if (MP_MX(A0, pred_flag_index_l1, mxA)) {

  644.             goto b_candidates;

  645.         }

  646.     }

  647. 

  648.     if (is_available_a1) {

  649.         if (MP_MX(A1, pred_flag_index_l0, mxA)) {

  650.             goto b_candidates;

  651.         }

  652.         if (MP_MX(A1, pred_flag_index_l1, mxA)) {

  653.             goto b_candidates;

  654.         }

  655.     }

  656. 

  657.     if (is_available_a0) {

  658.         if (MP_MX_LT(A0, pred_flag_index_l0, mxA)) {

  659.             goto b_candidates;

  660.         }

  661.         if (MP_MX_LT(A0, pred_flag_index_l1, mxA)) {

  662.             goto b_candidates;

  663.         }

  664.     }

  665. 

  666.     if (is_available_a1) {

  667.         if (MP_MX_LT(A1, pred_flag_index_l0, mxA)) {

  668.             goto b_candidates;

  669.         }

  670.         if (MP_MX_LT(A1, pred_flag_index_l1, mxA)) {

  671.             goto b_candidates;

  672.         }

  673.     }

  674.     availableFlagLXA0 = 0;

  675. 

  676. b_candidates:

  677.     // B candidates

  678.     // above right spatial merge candidate

  679.     xB0    = x0 + nPbW;

  680.     yB0    = y0 - 1;

  681. 

  682.     is_available_b0 =  AVAILABLE(cand_up_right, B0) &&

  683.                        xB0 < s->ps.sps->width &&

  684.                        PRED_BLOCK_AVAILABLE(B0);

  685. 

  686.     // above spatial merge candidate

  687.     xB1    = x0 + nPbW - 1;

  688.     yB1    = y0 - 1;

  689.     is_available_b1 = AVAILABLE(cand_up, B1);

  690. 

  691.     // above left spatial merge candidate

  692.     xB2 = x0 - 1;

  693.     yB2 = y0 - 1;

  694.     is_available_b2 = AVAILABLE(cand_up_left, B2);

  695. 

  696.     // above right spatial merge candidate

  697.     if (is_available_b0) {

  698.         if (MP_MX(B0, pred_flag_index_l0, mxB)) {

  699.             goto scalef;

  700.         }

  701.         if (MP_MX(B0, pred_flag_index_l1, mxB)) {

  702.             goto scalef;

  703.         }

  704.     }

  705. 

  706.     // above spatial merge candidate

  707.     if (is_available_b1) {

  708.         if (MP_MX(B1, pred_flag_index_l0, mxB)) {

  709.             goto scalef;

  710.         }

  711.         if (MP_MX(B1, pred_flag_index_l1, mxB)) {

  712.             goto scalef;

  713.         }

  714.     }

  715. 

  716.     // above left spatial merge candidate

  717.     if (is_available_b2) {

  718.         if (MP_MX(B2, pred_flag_index_l0, mxB)) {

  719.             goto scalef;

  720.         }

  721.         if (MP_MX(B2, pred_flag_index_l1, mxB)) {

  722.             goto scalef;

  723.         }

  724.     }

  725.     availableFlagLXB0 = 0;

  726. 

  727. scalef:

  728.     if (!isScaledFlag_L0) {

  729.         if (availableFlagLXB0) {

  730.             availableFlagLXA0 = 1;

  731.             mxA = mxB;

  732.         }

  733.         availableFlagLXB0 = 0;

  734. 

  735.         // XB0 and L1

  736.         if (is_available_b0) {

  737.             availableFlagLXB0 = MP_MX_LT(B0, pred_flag_index_l0, mxB);

  738.             if (!availableFlagLXB0)

  739.                 availableFlagLXB0 = MP_MX_LT(B0, pred_flag_index_l1, mxB);

  740.         }

  741. 

  742.         if (is_available_b1 && !availableFlagLXB0) {

  743.             availableFlagLXB0 = MP_MX_LT(B1, pred_flag_index_l0, mxB);

  744.             if (!availableFlagLXB0)

  745.                 availableFlagLXB0 = MP_MX_LT(B1, pred_flag_index_l1, mxB);

  746.         }

  747. 

  748.         if (is_available_b2 && !availableFlagLXB0) {

  749.             availableFlagLXB0 = MP_MX_LT(B2, pred_flag_index_l0, mxB);

  750.             if (!availableFlagLXB0)

  751.                 availableFlagLXB0 = MP_MX_LT(B2, pred_flag_index_l1, mxB);

  752.         }

  753.     }

  754. 

  755.     if (availableFlagLXA0)

  756.         mvpcand_list[numMVPCandLX++] = mxA;

  757. 

  758.     if (availableFlagLXB0 && (!availableFlagLXA0 || mxA.x != mxB.x || mxA.y != mxB.y))

  759.         mvpcand_list[numMVPCandLX++] = mxB;

  760. 

  761.     //temporal motion vector prediction candidate

  762.     if (numMVPCandLX < 2 && s->sh.slice_temporal_mvp_enabled_flag &&

  763.         mvp_lx_flag == numMVPCandLX) {

  764.         Mv mv_col;

  765.         int available_col = temporal_luma_motion_vector(s, x0, y0, nPbW,

  766.                                                         nPbH, ref_idx,

  767.                                                         &mv_col, LX);

  768.         if (available_col)

  769.             mvpcand_list[numMVPCandLX++] = mv_col;

  770.     }

  771. 

  772.     mv->mv[LX] = mvpcand_list[mvp_lx_flag];

  773. }