falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
42690 Commits
32 Branches
776MB
Tree: 69a68593ce
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from '69a68593ce'
${ noResults }
FFmpeg/libavcodec/h264_direct.c

709 lines
29KB
Raw Blame History 

  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 Libav.

  6.  *

  7.  * Libav 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.  * Libav 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 Libav; 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 / MPEG4 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.         sl->col_parity = (FFABS(col_poc[0] - cur_poc) >=

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

  142.         ref1sidx =

  143.         sidx     = sl->col_parity;

  144.     // FL -> FL & differ parity

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

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

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

  148.     }

  149. 

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

  151.         return;

  152. 

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

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

  155.         if (FRAME_MBAFF(h))

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

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

  158.                             field, 1);

  159.     }

  160. }

  161. 

  162. static void await_reference_mb_row(const H264Context *const h, H264Picture *ref,

  163.                                    int mb_y)

  164. {

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

  166.     int ref_field_picture = ref->field_picture;

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

  168. 

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

  170.         return;

  171. 

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

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

  174. 

  175.     ff_thread_await_progress(&ref->tf,

  176.                              FFMIN(16 * mb_y >> ref_field_picture,

  177.                                    ref_height - 1),

  178.                              ref_field_picture && ref_field);

  179. }

  180. 

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

  182.                                        int *mb_type)

  183. {

  184.     int b8_stride = 2;

  185.     int b4_stride = h->b_stride;

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

  187.     int mb_type_col[2];

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

  189.     const int8_t *l1ref0, *l1ref1;

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

  191.     unsigned int sub_mb_type = MB_TYPE_L0L1;

  192.     int i8, i4;

  193.     int ref[2];

  194.     int mv[2];

  195.     int list;

  196. 

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

  198. 

  199.     await_reference_mb_row(h, sl->ref_list[1][0].parent,

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

  201. 

  202. #define MB_TYPE_16x16_OR_INTRA (MB_TYPE_16x16 | MB_TYPE_INTRA4x4 | \

  203.                                 MB_TYPE_INTRA16x16 | MB_TYPE_INTRA_PCM)

  204. 

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

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

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

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

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

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

  211.         if (refc == PART_NOT_AVAILABLE) {

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

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

  214.         }

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

  216.                            (unsigned)top_ref,

  217.                            (unsigned)refc);

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

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

  220.              * cannot happen for direct blocks. */

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

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

  223. 

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

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

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

  227. 

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

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

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

  231.             } else {

  232.                 assert(match_count == 1);

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

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

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

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

  237.                 else

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

  239.             }

  240.         } else {

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

  242.             mv[list]  = 0;

  243.             ref[list] = -1;

  244.             if (!is_b8x8)

  245.                 *mb_type &= mask;

  246.             sub_mb_type &= mask;

  247.         }

  248.     }

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

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

  251.         if (!is_b8x8)

  252.             *mb_type |= MB_TYPE_L0L1;

  253.         sub_mb_type |= MB_TYPE_L0L1;

  254.     }

  255. 

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

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

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

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

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

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

  262.                                  MB_TYPE_P1L0 | MB_TYPE_P1L1)) |

  263.                    MB_TYPE_16x16 | MB_TYPE_DIRECT2;

  264.         return;

  265.     }

  266. 

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

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

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

  270.             mb_xy = sl->mb_x +

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

  272.             b8_stride = 0;

  273.         } else {

  274.             mb_y  += sl->col_fieldoff;

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

  276.         }

  277.         goto single_col;

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

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

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

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

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

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

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

  285.             b4_stride     *= 6;

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

  287.                 IS_INTERLACED(mb_type_col[1])) {

  288.                 mb_type_col[0] &= ~MB_TYPE_INTERLACED;

  289.                 mb_type_col[1] &= ~MB_TYPE_INTERLACED;

  290.             }

  291. 

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

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

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

  295.                 !is_b8x8) {

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

  297.             } else {

  298.                 *mb_type |= MB_TYPE_8x8;

  299.             }

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

  301. single_col:

  302.             mb_type_col[0] =

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

  304. 

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

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

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

  308.             } else if (!is_b8x8 &&

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

  310.                 *mb_type |= MB_TYPE_DIRECT2 |

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

  312.             } else {

  313.                 if (!h->sps.direct_8x8_inference_flag) {

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

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

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

  317.                 }

  318.                 *mb_type |= MB_TYPE_8x8;

  319.             }

  320.         }

  321.     }

  322. 

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

  324. 

  325.     l1mv0  = &sl->ref_list[1][0].parent->motion_val[0][h->mb2b_xy[mb_xy]];

  326.     l1mv1  = &sl->ref_list[1][0].parent->motion_val[1][h->mb2b_xy[mb_xy]];

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

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

  329.     if (!b8_stride) {

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

  331.             l1ref0 += 2;

  332.             l1ref1 += 2;

  333.             l1mv0  += 2 * b4_stride;

  334.             l1mv1  += 2 * b4_stride;

  335.         }

  336.     }

  337. 

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

  339.         int n = 0;

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

  341.             int x8  = i8 & 1;

  342.             int y8  = i8 >> 1;

  343.             int xy8 = x8     + y8 * b8_stride;

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

  345.             int a, b;

  346. 

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

  348.                 continue;

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

  350. 

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

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

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

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

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

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

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

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

  359.                  (l1ref0[xy8] < 0 &&

  360.                   l1ref1[xy8] == 0 &&

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

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

  363.                 a =

  364.                 b = 0;

  365.                 if (ref[0] > 0)

  366.                     a = mv[0];

  367.                 if (ref[1] > 0)

  368.                     b = mv[1];

  369.                 n++;

  370.             } else {

  371.                 a = mv[0];

  372.                 b = mv[1];

  373.             }

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

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

  376.         }

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

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

  379.                                      MB_TYPE_P1L0 | MB_TYPE_P1L1)) |

  380.                        MB_TYPE_16x16 | MB_TYPE_DIRECT2;

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

  382.         int a, b;

  383. 

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

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

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

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

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

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

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

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

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

  393.               h->x264_build > 33U))) {

  394.             a = b = 0;

  395.             if (ref[0] > 0)

  396.                 a = mv[0];

  397.             if (ref[1] > 0)

  398.                 b = mv[1];

  399.         } else {

  400.             a = mv[0];

  401.             b = mv[1];

  402.         }

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

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

  405.     } else {

  406.         int n = 0;

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

  408.             const int x8 = i8 & 1;

  409.             const int y8 = i8 >> 1;

  410. 

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

  412.                 continue;

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

  414. 

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

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

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

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

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

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

  421. 

  422.             assert(b8_stride == 2);

  423.             /* col_zero_flag */

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

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

  426.                  (l1ref0[i8] < 0 &&

  427.                   l1ref1[i8] == 0 &&

  428.                   h->x264_build > 33U))) {

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

  430.                 if (IS_SUB_8X8(sub_mb_type)) {

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

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

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

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

  435.                                            8, 0, 4);

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

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

  438.                                            8, 0, 4);

  439.                         n += 4;

  440.                     }

  441.                 } else {

  442.                     int m = 0;

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

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

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

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

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

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

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

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

  451.                             m++;

  452.                         }

  453.                     }

  454.                     if (!(m & 3))

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

  456.                     n += m;

  457.                 }

  458.             }

  459.         }

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

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

  462.                                      MB_TYPE_P1L0 | MB_TYPE_P1L1)) |

  463.                        MB_TYPE_16x16 | MB_TYPE_DIRECT2;

  464.     }

  465. }

  466. 

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

  468.                                     int *mb_type)

  469. {

  470.     int b8_stride = 2;

  471.     int b4_stride = h->b_stride;

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

  473.     int mb_type_col[2];

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

  475.     const int8_t *l1ref0, *l1ref1;

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

  477.     unsigned int sub_mb_type;

  478.     int i8, i4;

  479. 

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

  481. 

  482.     await_reference_mb_row(h, sl->ref_list[1][0].parent,

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

  484. 

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

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

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

  488.             mb_xy = sl->mb_x +

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

  490.             b8_stride = 0;

  491.         } else {

  492.             mb_y  += sl->col_fieldoff;

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

  494.         }

  495.         goto single_col;

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

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

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

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

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

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

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

  503.             b4_stride     *= 6;

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

  505.                 IS_INTERLACED(mb_type_col[1])) {

  506.                 mb_type_col[0] &= ~MB_TYPE_INTERLACED;

  507.                 mb_type_col[1] &= ~MB_TYPE_INTERLACED;

  508.             }

  509. 

  510.             sub_mb_type = MB_TYPE_16x16 | MB_TYPE_P0L0 | MB_TYPE_P0L1 |

  511.                           MB_TYPE_DIRECT2;                  /* B_SUB_8x8 */

  512. 

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

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

  515.                 !is_b8x8) {

  516.                 *mb_type |= MB_TYPE_16x8 | MB_TYPE_L0L1 |

  517.                             MB_TYPE_DIRECT2;                /* B_16x8 */

  518.             } else {

  519.                 *mb_type |= MB_TYPE_8x8 | MB_TYPE_L0L1;

  520.             }

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

  522. single_col:

  523.             mb_type_col[0]     =

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

  525. 

  526.             sub_mb_type = MB_TYPE_16x16 | MB_TYPE_P0L0 | MB_TYPE_P0L1 |

  527.                           MB_TYPE_DIRECT2;                  /* B_SUB_8x8 */

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

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

  530.                             MB_TYPE_DIRECT2;                /* B_16x16 */

  531.             } else if (!is_b8x8 &&

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

  533.                 *mb_type |= MB_TYPE_L0L1 | MB_TYPE_DIRECT2 |

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

  535.             } else {

  536.                 if (!h->sps.direct_8x8_inference_flag) {

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

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

  539.                     sub_mb_type = MB_TYPE_8x8 | MB_TYPE_P0L0 | MB_TYPE_P0L1 |

  540.                                   MB_TYPE_DIRECT2;          /* B_SUB_4x4 */

  541.                 }

  542.                 *mb_type |= MB_TYPE_8x8 | MB_TYPE_L0L1;

  543.             }

  544.         }

  545.     }

  546. 

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

  548. 

  549.     l1mv0  = &sl->ref_list[1][0].parent->motion_val[0][h->mb2b_xy[mb_xy]];

  550.     l1mv1  = &sl->ref_list[1][0].parent->motion_val[1][h->mb2b_xy[mb_xy]];

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

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

  553.     if (!b8_stride) {

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

  555.             l1ref0 += 2;

  556.             l1ref1 += 2;

  557.             l1mv0  += 2 * b4_stride;

  558.             l1mv1  += 2 * b4_stride;

  559.         }

  560.     }

  561. 

  562.     {

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

  564.                                            sl->map_col_to_list0[1] };

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

  566.         int ref_offset;

  567. 

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

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

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

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

  572.         }

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

  574. 

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

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

  577.             assert(h->sps.direct_8x8_inference_flag);

  578. 

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

  580.                 const int x8 = i8 & 1;

  581.                 const int y8 = i8 >> 1;

  582.                 int ref0, scale;

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

  584. 

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

  586.                     continue;

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

  588. 

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

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

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

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

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

  594.                     continue;

  595.                 }

  596. 

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

  598.                 if (ref0 >= 0)

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

  600.                 else {

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

  602.                                                ref_offset];

  603.                     l1mv = l1mv1;

  604.                 }

  605.                 scale = dist_scale_factor[ref0];

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

  607.                                ref0, 1);

  608. 

  609.                 {

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

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

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

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

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

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

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

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

  618.                 }

  619.             }

  620.             return;

  621.         }

  622. 

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

  624. 

  625.         if (IS_16X16(*mb_type)) {

  626.             int ref, mv0, mv1;

  627. 

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

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

  630.                 ref = mv0 = mv1 = 0;

  631.             } else {

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

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

  634.                 const int scale = dist_scale_factor[ref0];

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

  636.                 int mv_l0[2];

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

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

  639.                 ref      = ref0;

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

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

  642.             }

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

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

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

  646.         } else {

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

  648.                 const int x8 = i8 & 1;

  649.                 const int y8 = i8 >> 1;

  650.                 int ref0, scale;

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

  652. 

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

  654.                     continue;

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

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

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

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

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

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

  661.                     continue;

  662.                 }

  663. 

  664.                 assert(b8_stride == 2);

  665.                 ref0 = l1ref0[i8];

  666.                 if (ref0 >= 0)

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

  668.                 else {

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

  670.                     l1mv = l1mv1;

  671.                 }

  672.                 scale = dist_scale_factor[ref0];

  673. 

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

  675.                                ref0, 1);

  676.                 if (IS_SUB_8X8(sub_mb_type)) {

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

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

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

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

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

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

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

  684.                 } else {

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

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

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

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

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

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

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

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

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

  694.                     }

  695.                 }

  696.             }

  697.         }

  698.     }

  699. }

  700. 

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

  702.                                 int *mb_type)

  703. {

  704.     if (sl->direct_spatial_mv_pred)

  705.         pred_spatial_direct_motion(h, sl, mb_type);

  706.     else

  707.         pred_temp_direct_motion(h, sl, mb_type);

  708. }