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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 "h264dec.h"

  31. #include "h264_ps.h"

  32. #include "mpegutils.h"

  33. #include "rectangle.h"

  34. #include "thread.h"

  35. 

  36. #include <assert.h>

  37. 

  38. static int get_scale_factor(H264SliceContext *sl,

  39.                             int poc, int poc1, int i)

  40. {

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

  42.     int64_t pocdiff = poc1 - (int64_t)poc0;

  43.     int td = av_clip_int8(pocdiff);

  44. 

  45.     if (pocdiff != (int)pocdiff)

  46.         avpriv_request_sample(sl->h264->avctx, "pocdiff overflow\n");

  47. 

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

  49.         return 256;

  50.     } else {

  51.         int64_t pocdiff0 = poc - (int64_t)poc0;

  52.         int tb = av_clip_int8(pocdiff0);

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

  54. 

  55.         if (pocdiff0 != (int)pocdiff0)

  56.             av_log(sl->h264->avctx, AV_LOG_DEBUG, "pocdiff0 overflow\n");

  57. 

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

  59.     }

  60. }

  61. 

  62. void ff_h264_direct_dist_scale_factor(const H264Context *const h,

  63.                                       H264SliceContext *sl)

  64. {

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

  66.                                       : h->cur_pic_ptr->poc;

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

  68.     int i, field;

  69. 

  70.     if (FRAME_MBAFF(h))

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

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

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

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

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

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

  77.         }

  78. 

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

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

  81. }

  82. 

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

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

  85.                         int field, int colfield, int mbafi)

  86. {

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

  88.     int j, old_ref, rfield;

  89.     int start  = mbafi ? 16                       : 0;

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

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

  92. 

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

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

  95. 

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

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

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

  99. 

  100.             if (!interl)

  101.                 poc |= 3;

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

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

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

  105. 

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

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

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

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

  110.                     if (ref1->mbaff)

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

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

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

  114.                     break;

  115.                 }

  116.             }

  117.         }

  118.     }

  119. }

  120. 

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

  122. {

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

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

  125.     int list, j, field;

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

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

  128. 

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

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

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

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

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

  134.     }

  135. 

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

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

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

  139.     }

  140. 

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

  142. 

  143.     sl->col_fieldoff = 0;

  144. 

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

  146.         return;

  147. 

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

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

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

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

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

  153.             sl->col_parity = 1;

  154.         } else

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

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

  157.         ref1sidx =

  158.         sidx     = sl->col_parity;

  159.     // FL -> FL & differ parity

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

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

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

  163.     }

  164. 

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

  166.         return;

  167. 

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

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

  170.         if (FRAME_MBAFF(h))

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

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

  173.                             field, 1);

  174.     }

  175. }

  176. 

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

  178.                                    int mb_y)

  179. {

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

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

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

  183. 

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

  185.         return;

  186. 

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

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

  189. 

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

  191.                              FFMIN(16 * mb_y >> ref_field_picture,

  192.                                    ref_height - 1),

  193.                              ref_field_picture && ref_field);

  194. }

  195. 

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

  197.                                        int *mb_type)

  198. {

  199.     int b8_stride = 2;

  200.     int b4_stride = h->b_stride;

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

  202.     int mb_type_col[2];

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

  204.     const int8_t *l1ref0, *l1ref1;

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

  206.     unsigned int sub_mb_type = MB_TYPE_L0L1;

  207.     int i8, i4;

  208.     int ref[2];

  209.     int mv[2];

  210.     int list;

  211. 

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

  213. 

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

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

  216. 

  217. #define MB_TYPE_16x16_OR_INTRA (MB_TYPE_16x16 | MB_TYPE_INTRA4x4 | \

  218.                                 MB_TYPE_INTRA16x16 | MB_TYPE_INTRA_PCM)

  219. 

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

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

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

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

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

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

  226.         if (refc == PART_NOT_AVAILABLE) {

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

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

  229.         }

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

  231.                            (unsigned)top_ref,

  232.                            (unsigned)refc);

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

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

  235.              * cannot happen for direct blocks. */

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

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

  238. 

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

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

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

  242. 

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

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

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

  246.             } else {

  247.                 assert(match_count == 1);

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

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

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

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

  252.                 else

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

  254.             }

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

  256.         } else {

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

  258.             mv[list]  = 0;

  259.             ref[list] = -1;

  260.             if (!is_b8x8)

  261.                 *mb_type &= mask;

  262.             sub_mb_type &= mask;

  263.         }

  264.     }

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

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

  267.         if (!is_b8x8)

  268.             *mb_type |= MB_TYPE_L0L1;

  269.         sub_mb_type |= MB_TYPE_L0L1;

  270.     }

  271. 

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

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

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

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

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

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

  278.                                  MB_TYPE_P1L0 | MB_TYPE_P1L1)) |

  279.                    MB_TYPE_16x16 | MB_TYPE_DIRECT2;

  280.         return;

  281.     }

  282. 

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

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

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

  286.             mb_xy = sl->mb_x +

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

  288.             b8_stride = 0;

  289.         } else {

  290.             mb_y  += sl->col_fieldoff;

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

  292.         }

  293.         goto single_col;

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

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

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

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

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

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

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

  301.             b4_stride     *= 6;

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

  303.                 IS_INTERLACED(mb_type_col[1])) {

  304.                 mb_type_col[0] &= ~MB_TYPE_INTERLACED;

  305.                 mb_type_col[1] &= ~MB_TYPE_INTERLACED;

  306.             }

  307. 

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

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

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

  311.                 !is_b8x8) {

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

  313.             } else {

  314.                 *mb_type |= MB_TYPE_8x8;

  315.             }

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

  317. single_col:

  318.             mb_type_col[0] =

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

  320. 

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

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

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

  324.             } else if (!is_b8x8 &&

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

  326.                 *mb_type |= MB_TYPE_DIRECT2 |

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

  328.             } else {

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

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

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

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

  333.                 }

  334.                 *mb_type |= MB_TYPE_8x8;

  335.             }

  336.         }

  337.     }

  338. 

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

  340. 

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

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

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

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

  345.     if (!b8_stride) {

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

  347.             l1ref0 += 2;

  348.             l1ref1 += 2;

  349.             l1mv0  += 2 * b4_stride;

  350.             l1mv1  += 2 * b4_stride;

  351.         }

  352.     }

  353. 

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

  355.         int n = 0;

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

  357.             int x8  = i8 & 1;

  358.             int y8  = i8 >> 1;

  359.             int xy8 = x8     + y8 * b8_stride;

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

  361.             int a, b;

  362. 

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

  364.                 continue;

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

  366. 

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

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

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

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

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

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

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

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

  375.                  (l1ref0[xy8] < 0 &&

  376.                   l1ref1[xy8] == 0 &&

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

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

  379.                 a =

  380.                 b = 0;

  381.                 if (ref[0] > 0)

  382.                     a = mv[0];

  383.                 if (ref[1] > 0)

  384.                     b = mv[1];

  385.                 n++;

  386.             } else {

  387.                 a = mv[0];

  388.                 b = mv[1];

  389.             }

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

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

  392.         }

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

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

  395.                                      MB_TYPE_P1L0 | MB_TYPE_P1L1)) |

  396.                        MB_TYPE_16x16 | MB_TYPE_DIRECT2;

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

  398.         int a, b;

  399. 

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

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

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

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

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

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

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

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

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

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

  410.             a = b = 0;

  411.             if (ref[0] > 0)

  412.                 a = mv[0];

  413.             if (ref[1] > 0)

  414.                 b = mv[1];

  415.         } else {

  416.             a = mv[0];

  417.             b = mv[1];

  418.         }

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

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

  421.     } else {

  422.         int n = 0;

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

  424.             const int x8 = i8 & 1;

  425.             const int y8 = i8 >> 1;

  426. 

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

  428.                 continue;

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

  430. 

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

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

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

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

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

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

  437. 

  438.             assert(b8_stride == 2);

  439.             /* col_zero_flag */

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

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

  442.                  (l1ref0[i8] < 0 &&

  443.                   l1ref1[i8] == 0 &&

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

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

  446.                 if (IS_SUB_8X8(sub_mb_type)) {

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

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

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

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

  451.                                            8, 0, 4);

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

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

  454.                                            8, 0, 4);

  455.                         n += 4;

  456.                     }

  457.                 } else {

  458.                     int m = 0;

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

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

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

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

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

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

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

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

  467.                             m++;

  468.                         }

  469.                     }

  470.                     if (!(m & 3))

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

  472.                     n += m;

  473.                 }

  474.             }

  475.         }

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

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

  478.                                      MB_TYPE_P1L0 | MB_TYPE_P1L1)) |

  479.                        MB_TYPE_16x16 | MB_TYPE_DIRECT2;

  480.     }

  481. }

  482. 

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

  484.                                     int *mb_type)

  485. {

  486.     int b8_stride = 2;

  487.     int b4_stride = h->b_stride;

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

  489.     int mb_type_col[2];

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

  491.     const int8_t *l1ref0, *l1ref1;

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

  493.     unsigned int sub_mb_type;

  494.     int i8, i4;

  495. 

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

  497. 

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

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

  500. 

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

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

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

  504.             mb_xy = sl->mb_x +

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

  506.             b8_stride = 0;

  507.         } else {

  508.             mb_y  += sl->col_fieldoff;

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

  510.         }

  511.         goto single_col;

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

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

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

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

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

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

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

  519.             b4_stride     *= 6;

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

  521.                 IS_INTERLACED(mb_type_col[1])) {

  522.                 mb_type_col[0] &= ~MB_TYPE_INTERLACED;

  523.                 mb_type_col[1] &= ~MB_TYPE_INTERLACED;

  524.             }

  525. 

  526.             sub_mb_type = MB_TYPE_16x16 | MB_TYPE_P0L0 | MB_TYPE_P0L1 |

  527.                           MB_TYPE_DIRECT2;                  /* B_SUB_8x8 */

  528. 

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

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

  531.                 !is_b8x8) {

  532.                 *mb_type |= MB_TYPE_16x8 | MB_TYPE_L0L1 |

  533.                             MB_TYPE_DIRECT2;                /* B_16x8 */

  534.             } else {

  535.                 *mb_type |= MB_TYPE_8x8 | MB_TYPE_L0L1;

  536.             }

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

  538. single_col:

  539.             mb_type_col[0]     =

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

  541. 

  542.             sub_mb_type = MB_TYPE_16x16 | MB_TYPE_P0L0 | MB_TYPE_P0L1 |

  543.                           MB_TYPE_DIRECT2;                  /* B_SUB_8x8 */

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

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

  546.                             MB_TYPE_DIRECT2;                /* B_16x16 */

  547.             } else if (!is_b8x8 &&

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

  549.                 *mb_type |= MB_TYPE_L0L1 | MB_TYPE_DIRECT2 |

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

  551.             } else {

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

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

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

  555.                     sub_mb_type = MB_TYPE_8x8 | MB_TYPE_P0L0 | MB_TYPE_P0L1 |

  556.                                   MB_TYPE_DIRECT2;          /* B_SUB_4x4 */

  557.                 }

  558.                 *mb_type |= MB_TYPE_8x8 | MB_TYPE_L0L1;

  559.             }

  560.         }

  561.     }

  562. 

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

  564. 

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

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

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

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

  569.     if (!b8_stride) {

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

  571.             l1ref0 += 2;

  572.             l1ref1 += 2;

  573.             l1mv0  += 2 * b4_stride;

  574.             l1mv1  += 2 * b4_stride;

  575.         }

  576.     }

  577. 

  578.     {

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

  580.                                            sl->map_col_to_list0[1] };

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

  582.         int ref_offset;

  583. 

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

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

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

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

  588.         }

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

  590. 

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

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

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

  594. 

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

  596.                 const int x8 = i8 & 1;

  597.                 const int y8 = i8 >> 1;

  598.                 int ref0, scale;

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

  600. 

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

  602.                     continue;

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

  604. 

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

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

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

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

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

  610.                     continue;

  611.                 }

  612. 

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

  614.                 if (ref0 >= 0)

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

  616.                 else {

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

  618.                                                ref_offset];

  619.                     l1mv = l1mv1;

  620.                 }

  621.                 scale = dist_scale_factor[ref0];

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

  623.                                ref0, 1);

  624. 

  625.                 {

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

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

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

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

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

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

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

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

  634.                 }

  635.             }

  636.             return;

  637.         }

  638. 

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

  640. 

  641.         if (IS_16X16(*mb_type)) {

  642.             int ref, mv0, mv1;

  643. 

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

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

  646.                 ref = mv0 = mv1 = 0;

  647.             } else {

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

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

  650.                 const int scale = dist_scale_factor[ref0];

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

  652.                 int mv_l0[2];

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

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

  655.                 ref      = ref0;

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

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

  658.             }

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

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

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

  662.         } else {

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

  664.                 const int x8 = i8 & 1;

  665.                 const int y8 = i8 >> 1;

  666.                 int ref0, scale;

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

  668. 

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

  670.                     continue;

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

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

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

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

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

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

  677.                     continue;

  678.                 }

  679. 

  680.                 assert(b8_stride == 2);

  681.                 ref0 = l1ref0[i8];

  682.                 if (ref0 >= 0)

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

  684.                 else {

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

  686.                     l1mv = l1mv1;

  687.                 }

  688.                 scale = dist_scale_factor[ref0];

  689. 

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

  691.                                ref0, 1);

  692.                 if (IS_SUB_8X8(sub_mb_type)) {

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

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

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

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

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

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

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

  700.                 } else {

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

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

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

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

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

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

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

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

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

  710.                     }

  711.                 }

  712.             }

  713.         }

  714.     }

  715. }

  716. 

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

  718.                                 int *mb_type)

  719. {

  720.     if (sl->direct_spatial_mv_pred)

  721.         pred_spatial_direct_motion(h, sl, mb_type);

  722.     else

  723.         pred_temp_direct_motion(h, sl, mb_type);

  724. }