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FFmpeg/libavcodec/h264_direct.c

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  1. /*

  2.  * H.26L/H.264/AVC/JVT/14496-10/... direct mb/block decoding

  3.  * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

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

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

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

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

  11.  *

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

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

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

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

  20.  */

  21. 

  22. /**

  23.  * @file

  24.  * H.264 / AVC / MPEG-4 part10 direct mb/block decoding.

  25.  * @author Michael Niedermayer <michaelni@gmx.at>

  26.  */

  27. 

  28. #include "internal.h"

  29. #include "avcodec.h"

  30. #include "h264.h"

  31. #include "mpegutils.h"

  32. #include "rectangle.h"

  33. #include "thread.h"

  34. 

  35. #include <assert.h>

  36. 

  37. static int get_scale_factor(H264SliceContext *sl,

  38.                             int poc, int poc1, int i)

  39. {

  40.     int poc0 = sl->ref_list[0][i].poc;

  41.     int td = av_clip_int8(poc1 - poc0);

  42.     if (td == 0 || sl->ref_list[0][i].parent->long_ref) {

  43.         return 256;

  44.     } else {

  45.         int tb = av_clip_int8(poc - poc0);

  46.         int tx = (16384 + (FFABS(td) >> 1)) / td;

  47.         return av_clip_intp2((tb * tx + 32) >> 6, 10);

  48.     }

  49. }

  50. 

  51. void ff_h264_direct_dist_scale_factor(const H264Context *const h,

  52.                                       H264SliceContext *sl)

  53. {

  54.     const int poc  = FIELD_PICTURE(h) ? h->cur_pic_ptr->field_poc[h->picture_structure == PICT_BOTTOM_FIELD]

  55.                                       : h->cur_pic_ptr->poc;

  56.     const int poc1 = sl->ref_list[1][0].poc;

  57.     int i, field;

  58. 

  59.     if (FRAME_MBAFF(h))

  60.         for (field = 0; field < 2; field++) {

  61.             const int poc  = h->cur_pic_ptr->field_poc[field];

  62.             const int poc1 = sl->ref_list[1][0].parent->field_poc[field];

  63.             for (i = 0; i < 2 * sl->ref_count[0]; i++)

  64.                 sl->dist_scale_factor_field[field][i ^ field] =

  65.                     get_scale_factor(sl, poc, poc1, i + 16);

  66.         }

  67. 

  68.     for (i = 0; i < sl->ref_count[0]; i++)

  69.         sl->dist_scale_factor[i] = get_scale_factor(sl, poc, poc1, i);

  70. }

  71. 

  72. static void fill_colmap(const H264Context *h, H264SliceContext *sl,

  73.                         int map[2][16 + 32], int list,

  74.                         int field, int colfield, int mbafi)

  75. {

  76.     H264Picture *const ref1 = sl->ref_list[1][0].parent;

  77.     int j, old_ref, rfield;

  78.     int start  = mbafi ? 16                       : 0;

  79.     int end    = mbafi ? 16 + 2 * sl->ref_count[0] : sl->ref_count[0];

  80.     int interl = mbafi || h->picture_structure != PICT_FRAME;

  81. 

  82.     /* bogus; fills in for missing frames */

  83.     memset(map[list], 0, sizeof(map[list]));

  84. 

  85.     for (rfield = 0; rfield < 2; rfield++) {

  86.         for (old_ref = 0; old_ref < ref1->ref_count[colfield][list]; old_ref++) {

  87.             int poc = ref1->ref_poc[colfield][list][old_ref];

  88. 

  89.             if (!interl)

  90.                 poc |= 3;

  91.             // FIXME: store all MBAFF references so this is not needed

  92.             else if (interl && (poc & 3) == 3)

  93.                 poc = (poc & ~3) + rfield + 1;

  94. 

  95.             for (j = start; j < end; j++) {

  96.                 if (4 * sl->ref_list[0][j].parent->frame_num +

  97.                     (sl->ref_list[0][j].reference & 3) == poc) {

  98.                     int cur_ref = mbafi ? (j - 16) ^ field : j;

  99.                     if (ref1->mbaff)

  100.                         map[list][2 * old_ref + (rfield ^ field) + 16] = cur_ref;

  101.                     if (rfield == field || !interl)

  102.                         map[list][old_ref] = cur_ref;

  103.                     break;

  104.                 }

  105.             }

  106.         }

  107.     }

  108. }

  109. 

  110. void ff_h264_direct_ref_list_init(const H264Context *const h, H264SliceContext *sl)

  111. {

  112.     H264Ref *const ref1 = &sl->ref_list[1][0];

  113.     H264Picture *const cur = h->cur_pic_ptr;

  114.     int list, j, field;

  115.     int sidx     = (h->picture_structure & 1) ^ 1;

  116.     int ref1sidx = (ref1->reference      & 1) ^ 1;

  117. 

  118.     for (list = 0; list < sl->list_count; list++) {

  119.         cur->ref_count[sidx][list] = sl->ref_count[list];

  120.         for (j = 0; j < sl->ref_count[list]; j++)

  121.             cur->ref_poc[sidx][list][j] = 4 * sl->ref_list[list][j].parent->frame_num +

  122.                                           (sl->ref_list[list][j].reference & 3);

  123.     }

  124. 

  125.     if (h->picture_structure == PICT_FRAME) {

  126.         memcpy(cur->ref_count[1], cur->ref_count[0], sizeof(cur->ref_count[0]));

  127.         memcpy(cur->ref_poc[1],   cur->ref_poc[0],   sizeof(cur->ref_poc[0]));

  128.     }

  129. 

  130.     cur->mbaff = FRAME_MBAFF(h);

  131. 

  132.     sl->col_fieldoff = 0;

  133. 

  134.     if (sl->list_count != 2 || !sl->ref_count[1])

  135.         return;

  136. 

  137.     if (h->picture_structure == PICT_FRAME) {

  138.         int cur_poc  = h->cur_pic_ptr->poc;

  139.         int *col_poc = sl->ref_list[1][0].parent->field_poc;

  140.         if (col_poc[0] == INT_MAX && col_poc[1] == INT_MAX) {

  141.             av_log(h->avctx, AV_LOG_ERROR, "co located POCs unavailable\n");

  142.             sl->col_parity = 1;

  143.         } else

  144.         sl->col_parity = (FFABS(col_poc[0] - cur_poc) >=

  145.                           FFABS(col_poc[1] - cur_poc));

  146.         ref1sidx =

  147.         sidx     = sl->col_parity;

  148.     // FL -> FL & differ parity

  149.     } else if (!(h->picture_structure & sl->ref_list[1][0].reference) &&

  150.                !sl->ref_list[1][0].parent->mbaff) {

  151.         sl->col_fieldoff = 2 * sl->ref_list[1][0].reference - 3;

  152.     }

  153. 

  154.     if (sl->slice_type_nos != AV_PICTURE_TYPE_B || sl->direct_spatial_mv_pred)

  155.         return;

  156. 

  157.     for (list = 0; list < 2; list++) {

  158.         fill_colmap(h, sl, sl->map_col_to_list0, list, sidx, ref1sidx, 0);

  159.         if (FRAME_MBAFF(h))

  160.             for (field = 0; field < 2; field++)

  161.                 fill_colmap(h, sl, sl->map_col_to_list0_field[field], list, field,

  162.                             field, 1);

  163.     }

  164. }

  165. 

  166. static void await_reference_mb_row(const H264Context *const h, H264Ref *ref,

  167.                                    int mb_y)

  168. {

  169.     int ref_field         = ref->reference - 1;

  170.     int ref_field_picture = ref->parent->field_picture;

  171.     int ref_height        = 16 * h->mb_height >> ref_field_picture;

  172. 

  173.     if (!HAVE_THREADS || !(h->avctx->active_thread_type & FF_THREAD_FRAME))

  174.         return;

  175. 

  176.     /* FIXME: It can be safe to access mb stuff

  177.      * even if pixels aren't deblocked yet. */

  178. 

  179.     ff_thread_await_progress(&ref->parent->tf,

  180.                              FFMIN(16 * mb_y >> ref_field_picture,

  181.                                    ref_height - 1),

  182.                              ref_field_picture && ref_field);

  183. }

  184. 

  185. static void pred_spatial_direct_motion(const H264Context *const h, H264SliceContext *sl,

  186.                                        int *mb_type)

  187. {

  188.     int b8_stride = 2;

  189.     int b4_stride = h->b_stride;

  190.     int mb_xy = sl->mb_xy, mb_y = sl->mb_y;

  191.     int mb_type_col[2];

  192.     const int16_t (*l1mv0)[2], (*l1mv1)[2];

  193.     const int8_t *l1ref0, *l1ref1;

  194.     const int is_b8x8 = IS_8X8(*mb_type);

  195.     unsigned int sub_mb_type = MB_TYPE_L0L1;

  196.     int i8, i4;

  197.     int ref[2];

  198.     int mv[2];

  199.     int list;

  200. 

  201.     assert(sl->ref_list[1][0].reference & 3);

  202. 

  203.     await_reference_mb_row(h, &sl->ref_list[1][0],

  204.                            sl->mb_y + !!IS_INTERLACED(*mb_type));

  205. 

  206. #define MB_TYPE_16x16_OR_INTRA (MB_TYPE_16x16 | MB_TYPE_INTRA4x4 | \

  207.                                 MB_TYPE_INTRA16x16 | MB_TYPE_INTRA_PCM)

  208. 

  209.     /* ref = min(neighbors) */

  210.     for (list = 0; list < 2; list++) {

  211.         int left_ref     = sl->ref_cache[list][scan8[0] - 1];

  212.         int top_ref      = sl->ref_cache[list][scan8[0] - 8];

  213.         int refc         = sl->ref_cache[list][scan8[0] - 8 + 4];

  214.         const int16_t *C = sl->mv_cache[list][scan8[0]  - 8 + 4];

  215.         if (refc == PART_NOT_AVAILABLE) {

  216.             refc = sl->ref_cache[list][scan8[0] - 8 - 1];

  217.             C    = sl->mv_cache[list][scan8[0]  - 8 - 1];

  218.         }

  219.         ref[list] = FFMIN3((unsigned)left_ref,

  220.                            (unsigned)top_ref,

  221.                            (unsigned)refc);

  222.         if (ref[list] >= 0) {

  223.             /* This is just pred_motion() but with the cases removed that

  224.              * cannot happen for direct blocks. */

  225.             const int16_t *const A = sl->mv_cache[list][scan8[0] - 1];

  226.             const int16_t *const B = sl->mv_cache[list][scan8[0] - 8];

  227. 

  228.             int match_count = (left_ref == ref[list]) +

  229.                               (top_ref  == ref[list]) +

  230.                               (refc     == ref[list]);

  231. 

  232.             if (match_count > 1) { // most common

  233.                 mv[list] = pack16to32(mid_pred(A[0], B[0], C[0]),

  234.                                       mid_pred(A[1], B[1], C[1]));

  235.             } else {

  236.                 assert(match_count == 1);

  237.                 if (left_ref == ref[list])

  238.                     mv[list] = AV_RN32A(A);

  239.                 else if (top_ref == ref[list])

  240.                     mv[list] = AV_RN32A(B);

  241.                 else

  242.                     mv[list] = AV_RN32A(C);

  243.             }

  244.             av_assert2(ref[list] < (sl->ref_count[list] << !!FRAME_MBAFF(h)));

  245.         } else {

  246.             int mask = ~(MB_TYPE_L0 << (2 * list));

  247.             mv[list]  = 0;

  248.             ref[list] = -1;

  249.             if (!is_b8x8)

  250.                 *mb_type &= mask;

  251.             sub_mb_type &= mask;

  252.         }

  253.     }

  254.     if (ref[0] < 0 && ref[1] < 0) {

  255.         ref[0] = ref[1] = 0;

  256.         if (!is_b8x8)

  257.             *mb_type |= MB_TYPE_L0L1;

  258.         sub_mb_type |= MB_TYPE_L0L1;

  259.     }

  260. 

  261.     if (!(is_b8x8 | mv[0] | mv[1])) {

  262.         fill_rectangle(&sl->ref_cache[0][scan8[0]], 4, 4, 8, (uint8_t)ref[0], 1);

  263.         fill_rectangle(&sl->ref_cache[1][scan8[0]], 4, 4, 8, (uint8_t)ref[1], 1);

  264.         fill_rectangle(&sl->mv_cache[0][scan8[0]], 4, 4, 8, 0, 4);

  265.         fill_rectangle(&sl->mv_cache[1][scan8[0]], 4, 4, 8, 0, 4);

  266.         *mb_type = (*mb_type & ~(MB_TYPE_8x8 | MB_TYPE_16x8 | MB_TYPE_8x16 |

  267.                                  MB_TYPE_P1L0 | MB_TYPE_P1L1)) |

  268.                    MB_TYPE_16x16 | MB_TYPE_DIRECT2;

  269.         return;

  270.     }

  271. 

  272.     if (IS_INTERLACED(sl->ref_list[1][0].parent->mb_type[mb_xy])) { // AFL/AFR/FR/FL -> AFL/FL

  273.         if (!IS_INTERLACED(*mb_type)) {                    //     AFR/FR    -> AFL/FL

  274.             mb_y  = (sl->mb_y & ~1) + sl->col_parity;

  275.             mb_xy = sl->mb_x +

  276.                     ((sl->mb_y & ~1) + sl->col_parity) * h->mb_stride;

  277.             b8_stride = 0;

  278.         } else {

  279.             mb_y  += sl->col_fieldoff;

  280.             mb_xy += h->mb_stride * sl->col_fieldoff; // non-zero for FL -> FL & differ parity

  281.         }

  282.         goto single_col;

  283.     } else {                                             // AFL/AFR/FR/FL -> AFR/FR

  284.         if (IS_INTERLACED(*mb_type)) {                   // AFL       /FL -> AFR/FR

  285.             mb_y           =  sl->mb_y & ~1;

  286.             mb_xy          = (sl->mb_y & ~1) * h->mb_stride + sl->mb_x;

  287.             mb_type_col[0] = sl->ref_list[1][0].parent->mb_type[mb_xy];

  288.             mb_type_col[1] = sl->ref_list[1][0].parent->mb_type[mb_xy + h->mb_stride];

  289.             b8_stride      = 2 + 4 * h->mb_stride;

  290.             b4_stride     *= 6;

  291.             if (IS_INTERLACED(mb_type_col[0]) !=

  292.                 IS_INTERLACED(mb_type_col[1])) {

  293.                 mb_type_col[0] &= ~MB_TYPE_INTERLACED;

  294.                 mb_type_col[1] &= ~MB_TYPE_INTERLACED;

  295.             }

  296. 

  297.             sub_mb_type |= MB_TYPE_16x16 | MB_TYPE_DIRECT2; /* B_SUB_8x8 */

  298.             if ((mb_type_col[0] & MB_TYPE_16x16_OR_INTRA) &&

  299.                 (mb_type_col[1] & MB_TYPE_16x16_OR_INTRA) &&

  300.                 !is_b8x8) {

  301.                 *mb_type |= MB_TYPE_16x8 | MB_TYPE_DIRECT2;  /* B_16x8 */

  302.             } else {

  303.                 *mb_type |= MB_TYPE_8x8;

  304.             }

  305.         } else {                                         //     AFR/FR    -> AFR/FR

  306. single_col:

  307.             mb_type_col[0] =

  308.             mb_type_col[1] = sl->ref_list[1][0].parent->mb_type[mb_xy];

  309. 

  310.             sub_mb_type |= MB_TYPE_16x16 | MB_TYPE_DIRECT2; /* B_SUB_8x8 */

  311.             if (!is_b8x8 && (mb_type_col[0] & MB_TYPE_16x16_OR_INTRA)) {

  312.                 *mb_type |= MB_TYPE_16x16 | MB_TYPE_DIRECT2; /* B_16x16 */

  313.             } else if (!is_b8x8 &&

  314.                        (mb_type_col[0] & (MB_TYPE_16x8 | MB_TYPE_8x16))) {

  315.                 *mb_type |= MB_TYPE_DIRECT2 |

  316.                             (mb_type_col[0] & (MB_TYPE_16x8 | MB_TYPE_8x16));

  317.             } else {

  318.                 if (!h->ps.sps->direct_8x8_inference_flag) {

  319.                     /* FIXME: Save sub mb types from previous frames (or derive

  320.                      * from MVs) so we know exactly what block size to use. */

  321.                     sub_mb_type += (MB_TYPE_8x8 - MB_TYPE_16x16); /* B_SUB_4x4 */

  322.                 }

  323.                 *mb_type |= MB_TYPE_8x8;

  324.             }

  325.         }

  326.     }

  327. 

  328.     await_reference_mb_row(h, &sl->ref_list[1][0], mb_y);

  329. 

  330.     l1mv0  = (void*)&sl->ref_list[1][0].parent->motion_val[0][h->mb2b_xy[mb_xy]];

  331.     l1mv1  = (void*)&sl->ref_list[1][0].parent->motion_val[1][h->mb2b_xy[mb_xy]];

  332.     l1ref0 = &sl->ref_list[1][0].parent->ref_index[0][4 * mb_xy];

  333.     l1ref1 = &sl->ref_list[1][0].parent->ref_index[1][4 * mb_xy];

  334.     if (!b8_stride) {

  335.         if (sl->mb_y & 1) {

  336.             l1ref0 += 2;

  337.             l1ref1 += 2;

  338.             l1mv0  += 2 * b4_stride;

  339.             l1mv1  += 2 * b4_stride;

  340.         }

  341.     }

  342. 

  343.     if (IS_INTERLACED(*mb_type) != IS_INTERLACED(mb_type_col[0])) {

  344.         int n = 0;

  345.         for (i8 = 0; i8 < 4; i8++) {

  346.             int x8  = i8 & 1;

  347.             int y8  = i8 >> 1;

  348.             int xy8 = x8     + y8 * b8_stride;

  349.             int xy4 = x8 * 3 + y8 * b4_stride;

  350.             int a, b;

  351. 

  352.             if (is_b8x8 && !IS_DIRECT(sl->sub_mb_type[i8]))

  353.                 continue;

  354.             sl->sub_mb_type[i8] = sub_mb_type;

  355. 

  356.             fill_rectangle(&sl->ref_cache[0][scan8[i8 * 4]], 2, 2, 8,

  357.                            (uint8_t)ref[0], 1);

  358.             fill_rectangle(&sl->ref_cache[1][scan8[i8 * 4]], 2, 2, 8,

  359.                            (uint8_t)ref[1], 1);

  360.             if (!IS_INTRA(mb_type_col[y8]) && !sl->ref_list[1][0].parent->long_ref &&

  361.                 ((l1ref0[xy8] == 0 &&

  362.                   FFABS(l1mv0[xy4][0]) <= 1 &&

  363.                   FFABS(l1mv0[xy4][1]) <= 1) ||

  364.                  (l1ref0[xy8] < 0 &&

  365.                   l1ref1[xy8] == 0 &&

  366.                   FFABS(l1mv1[xy4][0]) <= 1 &&

  367.                   FFABS(l1mv1[xy4][1]) <= 1))) {

  368.                 a =

  369.                 b = 0;

  370.                 if (ref[0] > 0)

  371.                     a = mv[0];

  372.                 if (ref[1] > 0)

  373.                     b = mv[1];

  374.                 n++;

  375.             } else {

  376.                 a = mv[0];

  377.                 b = mv[1];

  378.             }

  379.             fill_rectangle(&sl->mv_cache[0][scan8[i8 * 4]], 2, 2, 8, a, 4);

  380.             fill_rectangle(&sl->mv_cache[1][scan8[i8 * 4]], 2, 2, 8, b, 4);

  381.         }

  382.         if (!is_b8x8 && !(n & 3))

  383.             *mb_type = (*mb_type & ~(MB_TYPE_8x8 | MB_TYPE_16x8 | MB_TYPE_8x16 |

  384.                                      MB_TYPE_P1L0 | MB_TYPE_P1L1)) |

  385.                        MB_TYPE_16x16 | MB_TYPE_DIRECT2;

  386.     } else if (IS_16X16(*mb_type)) {

  387.         int a, b;

  388. 

  389.         fill_rectangle(&sl->ref_cache[0][scan8[0]], 4, 4, 8, (uint8_t)ref[0], 1);

  390.         fill_rectangle(&sl->ref_cache[1][scan8[0]], 4, 4, 8, (uint8_t)ref[1], 1);

  391.         if (!IS_INTRA(mb_type_col[0]) && !sl->ref_list[1][0].parent->long_ref &&

  392.             ((l1ref0[0] == 0 &&

  393.               FFABS(l1mv0[0][0]) <= 1 &&

  394.               FFABS(l1mv0[0][1]) <= 1) ||

  395.              (l1ref0[0] < 0 && !l1ref1[0] &&

  396.               FFABS(l1mv1[0][0]) <= 1 &&

  397.               FFABS(l1mv1[0][1]) <= 1 &&

  398.               h->sei.unregistered.x264_build > 33U))) {

  399.             a = b = 0;

  400.             if (ref[0] > 0)

  401.                 a = mv[0];

  402.             if (ref[1] > 0)

  403.                 b = mv[1];

  404.         } else {

  405.             a = mv[0];

  406.             b = mv[1];

  407.         }

  408.         fill_rectangle(&sl->mv_cache[0][scan8[0]], 4, 4, 8, a, 4);

  409.         fill_rectangle(&sl->mv_cache[1][scan8[0]], 4, 4, 8, b, 4);

  410.     } else {

  411.         int n = 0;

  412.         for (i8 = 0; i8 < 4; i8++) {

  413.             const int x8 = i8 & 1;

  414.             const int y8 = i8 >> 1;

  415. 

  416.             if (is_b8x8 && !IS_DIRECT(sl->sub_mb_type[i8]))

  417.                 continue;

  418.             sl->sub_mb_type[i8] = sub_mb_type;

  419. 

  420.             fill_rectangle(&sl->mv_cache[0][scan8[i8 * 4]], 2, 2, 8, mv[0], 4);

  421.             fill_rectangle(&sl->mv_cache[1][scan8[i8 * 4]], 2, 2, 8, mv[1], 4);

  422.             fill_rectangle(&sl->ref_cache[0][scan8[i8 * 4]], 2, 2, 8,

  423.                            (uint8_t)ref[0], 1);

  424.             fill_rectangle(&sl->ref_cache[1][scan8[i8 * 4]], 2, 2, 8,

  425.                            (uint8_t)ref[1], 1);

  426. 

  427.             assert(b8_stride == 2);

  428.             /* col_zero_flag */

  429.             if (!IS_INTRA(mb_type_col[0]) && !sl->ref_list[1][0].parent->long_ref &&

  430.                 (l1ref0[i8] == 0 ||

  431.                  (l1ref0[i8] < 0 &&

  432.                   l1ref1[i8] == 0 &&

  433.                   h->sei.unregistered.x264_build > 33U))) {

  434.                 const int16_t (*l1mv)[2] = l1ref0[i8] == 0 ? l1mv0 : l1mv1;

  435.                 if (IS_SUB_8X8(sub_mb_type)) {

  436.                     const int16_t *mv_col = l1mv[x8 * 3 + y8 * 3 * b4_stride];

  437.                     if (FFABS(mv_col[0]) <= 1 && FFABS(mv_col[1]) <= 1) {

  438.                         if (ref[0] == 0)

  439.                             fill_rectangle(&sl->mv_cache[0][scan8[i8 * 4]], 2, 2,

  440.                                            8, 0, 4);

  441.                         if (ref[1] == 0)

  442.                             fill_rectangle(&sl->mv_cache[1][scan8[i8 * 4]], 2, 2,

  443.                                            8, 0, 4);

  444.                         n += 4;

  445.                     }

  446.                 } else {

  447.                     int m = 0;

  448.                     for (i4 = 0; i4 < 4; i4++) {

  449.                         const int16_t *mv_col = l1mv[x8 * 2 + (i4 & 1) +

  450.                                                      (y8 * 2 + (i4 >> 1)) * b4_stride];

  451.                         if (FFABS(mv_col[0]) <= 1 && FFABS(mv_col[1]) <= 1) {

  452.                             if (ref[0] == 0)

  453.                                 AV_ZERO32(sl->mv_cache[0][scan8[i8 * 4 + i4]]);

  454.                             if (ref[1] == 0)

  455.                                 AV_ZERO32(sl->mv_cache[1][scan8[i8 * 4 + i4]]);

  456.                             m++;

  457.                         }

  458.                     }

  459.                     if (!(m & 3))

  460.                         sl->sub_mb_type[i8] += MB_TYPE_16x16 - MB_TYPE_8x8;

  461.                     n += m;

  462.                 }

  463.             }

  464.         }

  465.         if (!is_b8x8 && !(n & 15))

  466.             *mb_type = (*mb_type & ~(MB_TYPE_8x8 | MB_TYPE_16x8 | MB_TYPE_8x16 |

  467.                                      MB_TYPE_P1L0 | MB_TYPE_P1L1)) |

  468.                        MB_TYPE_16x16 | MB_TYPE_DIRECT2;

  469.     }

  470. }

  471. 

  472. static void pred_temp_direct_motion(const H264Context *const h, H264SliceContext *sl,

  473.                                     int *mb_type)

  474. {

  475.     int b8_stride = 2;

  476.     int b4_stride = h->b_stride;

  477.     int mb_xy = sl->mb_xy, mb_y = sl->mb_y;

  478.     int mb_type_col[2];

  479.     const int16_t (*l1mv0)[2], (*l1mv1)[2];

  480.     const int8_t *l1ref0, *l1ref1;

  481.     const int is_b8x8 = IS_8X8(*mb_type);

  482.     unsigned int sub_mb_type;

  483.     int i8, i4;

  484. 

  485.     assert(sl->ref_list[1][0].reference & 3);

  486. 

  487.     await_reference_mb_row(h, &sl->ref_list[1][0],

  488.                            sl->mb_y + !!IS_INTERLACED(*mb_type));

  489. 

  490.     if (IS_INTERLACED(sl->ref_list[1][0].parent->mb_type[mb_xy])) { // AFL/AFR/FR/FL -> AFL/FL

  491.         if (!IS_INTERLACED(*mb_type)) {                    //     AFR/FR    -> AFL/FL

  492.             mb_y  = (sl->mb_y & ~1) + sl->col_parity;

  493.             mb_xy = sl->mb_x +

  494.                     ((sl->mb_y & ~1) + sl->col_parity) * h->mb_stride;

  495.             b8_stride = 0;

  496.         } else {

  497.             mb_y  += sl->col_fieldoff;

  498.             mb_xy += h->mb_stride * sl->col_fieldoff; // non-zero for FL -> FL & differ parity

  499.         }

  500.         goto single_col;

  501.     } else {                                        // AFL/AFR/FR/FL -> AFR/FR

  502.         if (IS_INTERLACED(*mb_type)) {              // AFL       /FL -> AFR/FR

  503.             mb_y           = sl->mb_y & ~1;

  504.             mb_xy          = sl->mb_x + (sl->mb_y & ~1) * h->mb_stride;

  505.             mb_type_col[0] = sl->ref_list[1][0].parent->mb_type[mb_xy];

  506.             mb_type_col[1] = sl->ref_list[1][0].parent->mb_type[mb_xy + h->mb_stride];

  507.             b8_stride      = 2 + 4 * h->mb_stride;

  508.             b4_stride     *= 6;

  509.             if (IS_INTERLACED(mb_type_col[0]) !=

  510.                 IS_INTERLACED(mb_type_col[1])) {

  511.                 mb_type_col[0] &= ~MB_TYPE_INTERLACED;

  512.                 mb_type_col[1] &= ~MB_TYPE_INTERLACED;

  513.             }

  514. 

  515.             sub_mb_type = MB_TYPE_16x16 | MB_TYPE_P0L0 | MB_TYPE_P0L1 |

  516.                           MB_TYPE_DIRECT2;                  /* B_SUB_8x8 */

  517. 

  518.             if ((mb_type_col[0] & MB_TYPE_16x16_OR_INTRA) &&

  519.                 (mb_type_col[1] & MB_TYPE_16x16_OR_INTRA) &&

  520.                 !is_b8x8) {

  521.                 *mb_type |= MB_TYPE_16x8 | MB_TYPE_L0L1 |

  522.                             MB_TYPE_DIRECT2;                /* B_16x8 */

  523.             } else {

  524.                 *mb_type |= MB_TYPE_8x8 | MB_TYPE_L0L1;

  525.             }

  526.         } else {                                    //     AFR/FR    -> AFR/FR

  527. single_col:

  528.             mb_type_col[0]     =

  529.                 mb_type_col[1] = sl->ref_list[1][0].parent->mb_type[mb_xy];

  530. 

  531.             sub_mb_type = MB_TYPE_16x16 | MB_TYPE_P0L0 | MB_TYPE_P0L1 |

  532.                           MB_TYPE_DIRECT2;                  /* B_SUB_8x8 */

  533.             if (!is_b8x8 && (mb_type_col[0] & MB_TYPE_16x16_OR_INTRA)) {

  534.                 *mb_type |= MB_TYPE_16x16 | MB_TYPE_P0L0 | MB_TYPE_P0L1 |

  535.                             MB_TYPE_DIRECT2;                /* B_16x16 */

  536.             } else if (!is_b8x8 &&

  537.                        (mb_type_col[0] & (MB_TYPE_16x8 | MB_TYPE_8x16))) {

  538.                 *mb_type |= MB_TYPE_L0L1 | MB_TYPE_DIRECT2 |

  539.                             (mb_type_col[0] & (MB_TYPE_16x8 | MB_TYPE_8x16));

  540.             } else {

  541.                 if (!h->ps.sps->direct_8x8_inference_flag) {

  542.                     /* FIXME: save sub mb types from previous frames (or derive

  543.                      * from MVs) so we know exactly what block size to use */

  544.                     sub_mb_type = MB_TYPE_8x8 | MB_TYPE_P0L0 | MB_TYPE_P0L1 |

  545.                                   MB_TYPE_DIRECT2;          /* B_SUB_4x4 */

  546.                 }

  547.                 *mb_type |= MB_TYPE_8x8 | MB_TYPE_L0L1;

  548.             }

  549.         }

  550.     }

  551. 

  552.     await_reference_mb_row(h, &sl->ref_list[1][0], mb_y);

  553. 

  554.     l1mv0  = (void*)&sl->ref_list[1][0].parent->motion_val[0][h->mb2b_xy[mb_xy]];

  555.     l1mv1  = (void*)&sl->ref_list[1][0].parent->motion_val[1][h->mb2b_xy[mb_xy]];

  556.     l1ref0 = &sl->ref_list[1][0].parent->ref_index[0][4 * mb_xy];

  557.     l1ref1 = &sl->ref_list[1][0].parent->ref_index[1][4 * mb_xy];

  558.     if (!b8_stride) {

  559.         if (sl->mb_y & 1) {

  560.             l1ref0 += 2;

  561.             l1ref1 += 2;

  562.             l1mv0  += 2 * b4_stride;

  563.             l1mv1  += 2 * b4_stride;

  564.         }

  565.     }

  566. 

  567.     {

  568.         const int *map_col_to_list0[2] = { sl->map_col_to_list0[0],

  569.                                            sl->map_col_to_list0[1] };

  570.         const int *dist_scale_factor = sl->dist_scale_factor;

  571.         int ref_offset;

  572. 

  573.         if (FRAME_MBAFF(h) && IS_INTERLACED(*mb_type)) {

  574.             map_col_to_list0[0] = sl->map_col_to_list0_field[sl->mb_y & 1][0];

  575.             map_col_to_list0[1] = sl->map_col_to_list0_field[sl->mb_y & 1][1];

  576.             dist_scale_factor   = sl->dist_scale_factor_field[sl->mb_y & 1];

  577.         }

  578.         ref_offset = (sl->ref_list[1][0].parent->mbaff << 4) & (mb_type_col[0] >> 3);

  579. 

  580.         if (IS_INTERLACED(*mb_type) != IS_INTERLACED(mb_type_col[0])) {

  581.             int y_shift = 2 * !IS_INTERLACED(*mb_type);

  582.             assert(h->ps.sps->direct_8x8_inference_flag);

  583. 

  584.             for (i8 = 0; i8 < 4; i8++) {

  585.                 const int x8 = i8 & 1;

  586.                 const int y8 = i8 >> 1;

  587.                 int ref0, scale;

  588.                 const int16_t (*l1mv)[2] = l1mv0;

  589. 

  590.                 if (is_b8x8 && !IS_DIRECT(sl->sub_mb_type[i8]))

  591.                     continue;

  592.                 sl->sub_mb_type[i8] = sub_mb_type;

  593. 

  594.                 fill_rectangle(&sl->ref_cache[1][scan8[i8 * 4]], 2, 2, 8, 0, 1);

  595.                 if (IS_INTRA(mb_type_col[y8])) {

  596.                     fill_rectangle(&sl->ref_cache[0][scan8[i8 * 4]], 2, 2, 8, 0, 1);

  597.                     fill_rectangle(&sl->mv_cache[0][scan8[i8 * 4]], 2, 2, 8, 0, 4);

  598.                     fill_rectangle(&sl->mv_cache[1][scan8[i8 * 4]], 2, 2, 8, 0, 4);

  599.                     continue;

  600.                 }

  601. 

  602.                 ref0 = l1ref0[x8 + y8 * b8_stride];

  603.                 if (ref0 >= 0)

  604.                     ref0 = map_col_to_list0[0][ref0 + ref_offset];

  605.                 else {

  606.                     ref0 = map_col_to_list0[1][l1ref1[x8 + y8 * b8_stride] +

  607.                                                ref_offset];

  608.                     l1mv = l1mv1;

  609.                 }

  610.                 scale = dist_scale_factor[ref0];

  611.                 fill_rectangle(&sl->ref_cache[0][scan8[i8 * 4]], 2, 2, 8,

  612.                                ref0, 1);

  613. 

  614.                 {

  615.                     const int16_t *mv_col = l1mv[x8 * 3 + y8 * b4_stride];

  616.                     int my_col            = (mv_col[1] << y_shift) / 2;

  617.                     int mx                = (scale * mv_col[0] + 128) >> 8;

  618.                     int my                = (scale * my_col    + 128) >> 8;

  619.                     fill_rectangle(&sl->mv_cache[0][scan8[i8 * 4]], 2, 2, 8,

  620.                                    pack16to32(mx, my), 4);

  621.                     fill_rectangle(&sl->mv_cache[1][scan8[i8 * 4]], 2, 2, 8,

  622.                                    pack16to32(mx - mv_col[0], my - my_col), 4);

  623.                 }

  624.             }

  625.             return;

  626.         }

  627. 

  628.         /* one-to-one mv scaling */

  629. 

  630.         if (IS_16X16(*mb_type)) {

  631.             int ref, mv0, mv1;

  632. 

  633.             fill_rectangle(&sl->ref_cache[1][scan8[0]], 4, 4, 8, 0, 1);

  634.             if (IS_INTRA(mb_type_col[0])) {

  635.                 ref = mv0 = mv1 = 0;

  636.             } else {

  637.                 const int ref0 = l1ref0[0] >= 0 ? map_col_to_list0[0][l1ref0[0] + ref_offset]

  638.                                                 : map_col_to_list0[1][l1ref1[0] + ref_offset];

  639.                 const int scale = dist_scale_factor[ref0];

  640.                 const int16_t *mv_col = l1ref0[0] >= 0 ? l1mv0[0] : l1mv1[0];

  641.                 int mv_l0[2];

  642.                 mv_l0[0] = (scale * mv_col[0] + 128) >> 8;

  643.                 mv_l0[1] = (scale * mv_col[1] + 128) >> 8;

  644.                 ref      = ref0;

  645.                 mv0      = pack16to32(mv_l0[0], mv_l0[1]);

  646.                 mv1      = pack16to32(mv_l0[0] - mv_col[0], mv_l0[1] - mv_col[1]);

  647.             }

  648.             fill_rectangle(&sl->ref_cache[0][scan8[0]], 4, 4, 8, ref, 1);

  649.             fill_rectangle(&sl->mv_cache[0][scan8[0]], 4, 4, 8, mv0, 4);

  650.             fill_rectangle(&sl->mv_cache[1][scan8[0]], 4, 4, 8, mv1, 4);

  651.         } else {

  652.             for (i8 = 0; i8 < 4; i8++) {

  653.                 const int x8 = i8 & 1;

  654.                 const int y8 = i8 >> 1;

  655.                 int ref0, scale;

  656.                 const int16_t (*l1mv)[2] = l1mv0;

  657. 

  658.                 if (is_b8x8 && !IS_DIRECT(sl->sub_mb_type[i8]))

  659.                     continue;

  660.                 sl->sub_mb_type[i8] = sub_mb_type;

  661.                 fill_rectangle(&sl->ref_cache[1][scan8[i8 * 4]], 2, 2, 8, 0, 1);

  662.                 if (IS_INTRA(mb_type_col[0])) {

  663.                     fill_rectangle(&sl->ref_cache[0][scan8[i8 * 4]], 2, 2, 8, 0, 1);

  664.                     fill_rectangle(&sl->mv_cache[0][scan8[i8 * 4]], 2, 2, 8, 0, 4);

  665.                     fill_rectangle(&sl->mv_cache[1][scan8[i8 * 4]], 2, 2, 8, 0, 4);

  666.                     continue;

  667.                 }

  668. 

  669.                 assert(b8_stride == 2);

  670.                 ref0 = l1ref0[i8];

  671.                 if (ref0 >= 0)

  672.                     ref0 = map_col_to_list0[0][ref0 + ref_offset];

  673.                 else {

  674.                     ref0 = map_col_to_list0[1][l1ref1[i8] + ref_offset];

  675.                     l1mv = l1mv1;

  676.                 }

  677.                 scale = dist_scale_factor[ref0];

  678. 

  679.                 fill_rectangle(&sl->ref_cache[0][scan8[i8 * 4]], 2, 2, 8,

  680.                                ref0, 1);

  681.                 if (IS_SUB_8X8(sub_mb_type)) {

  682.                     const int16_t *mv_col = l1mv[x8 * 3 + y8 * 3 * b4_stride];

  683.                     int mx                = (scale * mv_col[0] + 128) >> 8;

  684.                     int my                = (scale * mv_col[1] + 128) >> 8;

  685.                     fill_rectangle(&sl->mv_cache[0][scan8[i8 * 4]], 2, 2, 8,

  686.                                    pack16to32(mx, my), 4);

  687.                     fill_rectangle(&sl->mv_cache[1][scan8[i8 * 4]], 2, 2, 8,

  688.                                    pack16to32(mx - mv_col[0], my - mv_col[1]), 4);

  689.                 } else {

  690.                     for (i4 = 0; i4 < 4; i4++) {

  691.                         const int16_t *mv_col = l1mv[x8 * 2 + (i4 & 1) +

  692.                                                      (y8 * 2 + (i4 >> 1)) * b4_stride];

  693.                         int16_t *mv_l0 = sl->mv_cache[0][scan8[i8 * 4 + i4]];

  694.                         mv_l0[0] = (scale * mv_col[0] + 128) >> 8;

  695.                         mv_l0[1] = (scale * mv_col[1] + 128) >> 8;

  696.                         AV_WN32A(sl->mv_cache[1][scan8[i8 * 4 + i4]],

  697.                                  pack16to32(mv_l0[0] - mv_col[0],

  698.                                             mv_l0[1] - mv_col[1]));

  699.                     }

  700.                 }

  701.             }

  702.         }

  703.     }

  704. }

  705. 

  706. void ff_h264_pred_direct_motion(const H264Context *const h, H264SliceContext *sl,

  707.                                 int *mb_type)

  708. {

  709.     if (sl->direct_spatial_mv_pred)

  710.         pred_spatial_direct_motion(h, sl, mb_type);

  711.     else

  712.         pred_temp_direct_motion(h, sl, mb_type);

  713. }