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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 / MPEG4 part10 direct mb/block decoding.

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

  26.  */

  27. 

  28. #include "internal.h"

  29. #include "dsputil.h"

  30. #include "avcodec.h"

  31. #include "mpegvideo.h"

  32. #include "h264.h"

  33. #include "rectangle.h"

  34. #include "thread.h"

  35. 

  36. //#undef NDEBUG

  37. #include <assert.h>

  38. 

  39. 

  40. static int get_scale_factor(H264Context * const h, int poc, int poc1, int i){

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

  42.     int td = av_clip(poc1 - poc0, -128, 127);

  43.     if(td == 0 || h->ref_list[0][i].long_ref){

  44.         return 256;

  45.     }else{

  46.         int tb = av_clip(poc - poc0, -128, 127);

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

  48.         return av_clip((tb*tx + 32) >> 6, -1024, 1023);

  49.     }

  50. }

  51. 

  52. void ff_h264_direct_dist_scale_factor(H264Context * const h){

  53.     MpegEncContext * const s = &h->s;

  54.     const int poc = h->s.current_picture_ptr->field_poc[ s->picture_structure == PICT_BOTTOM_FIELD ];

  55.     const int poc1 = h->ref_list[1][0].poc;

  56.     int i, field;

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

  58.         const int poc  = h->s.current_picture_ptr->field_poc[field];

  59.         const int poc1 = h->ref_list[1][0].field_poc[field];

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

  61.             h->dist_scale_factor_field[field][i^field] = get_scale_factor(h, poc, poc1, i+16);

  62.     }

  63. 

  64.     for(i=0; i<h->ref_count[0]; i++){

  65.         h->dist_scale_factor[i] = get_scale_factor(h, poc, poc1, i);

  66.     }

  67. }

  68. 

  69. static void fill_colmap(H264Context *h, int map[2][16+32], int list, int field, int colfield, int mbafi){

  70.     MpegEncContext * const s = &h->s;

  71.     Picture * const ref1 = &h->ref_list[1][0];

  72.     int j, old_ref, rfield;

  73.     int start= mbafi ? 16                      : 0;

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

  75.     int interl= mbafi || s->picture_structure != PICT_FRAME;

  76. 

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

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

  79. 

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

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

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

  83. 

  84.             if     (!interl)

  85.                 poc |= 3;

  86.             else if( interl && (poc&3) == 3) //FIXME store all MBAFF references so this isnt needed

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

  88. 

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

  90.                 if (4 * h->ref_list[0][j].frame_num + (h->ref_list[0][j].f.reference & 3) == poc) {

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

  92.                     if(ref1->mbaff)

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

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

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

  96.                     break;

  97.                 }

  98.             }

  99.         }

  100.     }

  101. }

  102. 

  103. void ff_h264_direct_ref_list_init(H264Context * const h){

  104.     MpegEncContext * const s = &h->s;

  105.     Picture * const ref1 = &h->ref_list[1][0];

  106.     Picture * const cur = s->current_picture_ptr;

  107.     int list, j, field;

  108.     int sidx= (s->picture_structure&1)^1;

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

  110. 

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

  112.         cur->ref_count[sidx][list] = h->ref_count[list];

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

  114.             cur->ref_poc[sidx][list][j] = 4 * h->ref_list[list][j].frame_num + (h->ref_list[list][j].f.reference & 3);

  115.     }

  116. 

  117.     if(s->picture_structure == PICT_FRAME){

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

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

  120.     }

  121. 

  122.     cur->mbaff= FRAME_MBAFF;

  123. 

  124.     h->col_fieldoff= 0;

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

  126.         int cur_poc = s->current_picture_ptr->poc;

  127.         int *col_poc = h->ref_list[1]->field_poc;

  128.         h->col_parity= (FFABS(col_poc[0] - cur_poc) >= FFABS(col_poc[1] - cur_poc));

  129.         ref1sidx=sidx= h->col_parity;

  130.     } else if (!(s->picture_structure & h->ref_list[1][0].f.reference) && !h->ref_list[1][0].mbaff) { // FL -> FL & differ parity

  131.         h->col_fieldoff = 2 * h->ref_list[1][0].f.reference - 3;

  132.     }

  133. 

  134.     if (cur->f.pict_type != AV_PICTURE_TYPE_B || h->direct_spatial_mv_pred)

  135.         return;

  136. 

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

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

  139.         if(FRAME_MBAFF)

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

  141.             fill_colmap(h, h->map_col_to_list0_field[field], list, field, field, 1);

  142.     }

  143. }

  144. 

  145. static void await_reference_mb_row(H264Context * const h, Picture *ref, int mb_y)

  146. {

  147.     int ref_field = ref->f.reference - 1;

  148.     int ref_field_picture = ref->field_picture;

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

  150. 

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

  152.         return;

  153. 

  154.     //FIXME it can be safe to access mb stuff

  155.     //even if pixels aren't deblocked yet

  156. 

  157.     ff_thread_await_progress(&ref->f,

  158.                              FFMIN(16 * mb_y >> ref_field_picture, ref_height - 1),

  159.                              ref_field_picture && ref_field);

  160. }

  161. 

  162. static void pred_spatial_direct_motion(H264Context * const h, int *mb_type){

  163.     MpegEncContext * const s = &h->s;

  164.     int b8_stride = 2;

  165.     int b4_stride = h->b_stride;

  166.     int mb_xy = h->mb_xy, mb_y = s->mb_y;

  167.     int mb_type_col[2];

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

  169.     const int8_t *l1ref0, *l1ref1;

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

  171.     unsigned int sub_mb_type= MB_TYPE_L0L1;

  172.     int i8, i4;

  173.     int ref[2];

  174.     int mv[2];

  175.     int list;

  176. 

  177.     assert(h->ref_list[1][0].f.reference & 3);

  178. 

  179.     await_reference_mb_row(h, &h->ref_list[1][0], s->mb_y + !!IS_INTERLACED(*mb_type));

  180. 

  181. #define MB_TYPE_16x16_OR_INTRA (MB_TYPE_16x16|MB_TYPE_INTRA4x4|MB_TYPE_INTRA16x16|MB_TYPE_INTRA_PCM)

  182. 

  183. 

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

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

  186.         int left_ref = h->ref_cache[list][scan8[0] - 1];

  187.         int top_ref  = h->ref_cache[list][scan8[0] - 8];

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

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

  190.         if(refc == PART_NOT_AVAILABLE){

  191.             refc = h->ref_cache[list][scan8[0] - 8 - 1];

  192.             C    = h-> mv_cache[list][scan8[0] - 8 - 1];

  193.         }

  194.         ref[list] = FFMIN3((unsigned)left_ref, (unsigned)top_ref, (unsigned)refc);

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

  196.             //this is just pred_motion() but with the cases removed that cannot happen for direct blocks

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

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

  199. 

  200.             int match_count= (left_ref==ref[list]) + (top_ref==ref[list]) + (refc==ref[list]);

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

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

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

  204.             }else {

  205.                 assert(match_count==1);

  206.                 if(left_ref==ref[list]){

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

  208.                 }else if(top_ref==ref[list]){

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

  210.                 }else{

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

  212.                 }

  213.             }

  214.         }else{

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

  216.             mv[list] = 0;

  217.             ref[list] = -1;

  218.             if(!is_b8x8)

  219.                 *mb_type &= mask;

  220.             sub_mb_type &= mask;

  221.         }

  222.     }

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

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

  225.         if(!is_b8x8)

  226.             *mb_type |= MB_TYPE_L0L1;

  227.         sub_mb_type |= MB_TYPE_L0L1;

  228.     }

  229. 

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

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

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

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

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

  235.         *mb_type= (*mb_type & ~(MB_TYPE_8x8|MB_TYPE_16x8|MB_TYPE_8x16|MB_TYPE_P1L0|MB_TYPE_P1L1))|MB_TYPE_16x16|MB_TYPE_DIRECT2;

  236.         return;

  237.     }

  238. 

  239.     if (IS_INTERLACED(h->ref_list[1][0].f.mb_type[mb_xy])) { // AFL/AFR/FR/FL -> AFL/FL

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

  241.             mb_y = (s->mb_y&~1) + h->col_parity;

  242.             mb_xy= s->mb_x + ((s->mb_y&~1) + h->col_parity)*s->mb_stride;

  243.             b8_stride = 0;

  244.         }else{

  245.             mb_y  += h->col_fieldoff;

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

  247.         }

  248.         goto single_col;

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

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

  251.             mb_y = s->mb_y&~1;

  252.             mb_xy= s->mb_x + (s->mb_y&~1)*s->mb_stride;

  253.             mb_type_col[0] = h->ref_list[1][0].f.mb_type[mb_xy];

  254.             mb_type_col[1] = h->ref_list[1][0].f.mb_type[mb_xy + s->mb_stride];

  255.             b8_stride = 2+4*s->mb_stride;

  256.             b4_stride *= 6;

  257.             if (IS_INTERLACED(mb_type_col[0]) != IS_INTERLACED(mb_type_col[1])) {

  258.                 mb_type_col[0] &= ~MB_TYPE_INTERLACED;

  259.                 mb_type_col[1] &= ~MB_TYPE_INTERLACED;

  260.             }

  261. 

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

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

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

  265.                 && !is_b8x8){

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

  267.             }else{

  268.                 *mb_type   |= MB_TYPE_8x8;

  269.             }

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

  271. single_col:

  272.             mb_type_col[0] =

  273.             mb_type_col[1] = h->ref_list[1][0].f.mb_type[mb_xy];

  274. 

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

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

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

  278.             }else if(!is_b8x8 && (mb_type_col[0] & (MB_TYPE_16x8|MB_TYPE_8x16))){

  279.                 *mb_type   |= MB_TYPE_DIRECT2 | (mb_type_col[0] & (MB_TYPE_16x8|MB_TYPE_8x16));

  280.             }else{

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

  282.                     /* FIXME save sub mb types from previous frames (or derive from MVs)

  283.                     * so we know exactly what block size to use */

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

  285.                 }

  286.                 *mb_type   |= MB_TYPE_8x8;

  287.             }

  288.         }

  289.     }

  290. 

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

  292. 

  293.     l1mv0  = &h->ref_list[1][0].f.motion_val[0][h->mb2b_xy [mb_xy]];

  294.     l1mv1  = &h->ref_list[1][0].f.motion_val[1][h->mb2b_xy [mb_xy]];

  295.     l1ref0 = &h->ref_list[1][0].f.ref_index [0][4 * mb_xy];

  296.     l1ref1 = &h->ref_list[1][0].f.ref_index [1][4 * mb_xy];

  297.     if(!b8_stride){

  298.         if(s->mb_y&1){

  299.             l1ref0 += 2;

  300.             l1ref1 += 2;

  301.             l1mv0  +=  2*b4_stride;

  302.             l1mv1  +=  2*b4_stride;

  303.         }

  304.     }

  305. 

  306. 

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

  308.             int n=0;

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

  310.                 int x8 = i8&1;

  311.                 int y8 = i8>>1;

  312.                 int xy8 = x8+y8*b8_stride;

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

  314.                 int a,b;

  315. 

  316.                 if(is_b8x8 && !IS_DIRECT(h->sub_mb_type[i8]))

  317.                     continue;

  318.                 h->sub_mb_type[i8] = sub_mb_type;

  319. 

  320.                 fill_rectangle(&h->ref_cache[0][scan8[i8*4]], 2, 2, 8, (uint8_t)ref[0], 1);

  321.                 fill_rectangle(&h->ref_cache[1][scan8[i8*4]], 2, 2, 8, (uint8_t)ref[1], 1);

  322.                 if(!IS_INTRA(mb_type_col[y8]) && !h->ref_list[1][0].long_ref

  323.                    && (   (l1ref0[xy8] == 0 && FFABS(l1mv0[xy4][0]) <= 1 && FFABS(l1mv0[xy4][1]) <= 1)

  324.                        || (l1ref0[xy8]  < 0 && l1ref1[xy8] == 0 && FFABS(l1mv1[xy4][0]) <= 1 && FFABS(l1mv1[xy4][1]) <= 1))){

  325.                     a=b=0;

  326.                     if(ref[0] > 0)

  327.                         a= mv[0];

  328.                     if(ref[1] > 0)

  329.                         b= mv[1];

  330.                     n++;

  331.                 }else{

  332.                     a= mv[0];

  333.                     b= mv[1];

  334.                 }

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

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

  337.             }

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

  339.                 *mb_type= (*mb_type & ~(MB_TYPE_8x8|MB_TYPE_16x8|MB_TYPE_8x16|MB_TYPE_P1L0|MB_TYPE_P1L1))|MB_TYPE_16x16|MB_TYPE_DIRECT2;

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

  341.             int a,b;

  342. 

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

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

  345.             if(!IS_INTRA(mb_type_col[0]) && !h->ref_list[1][0].long_ref

  346.                && (   (l1ref0[0] == 0 && FFABS(l1mv0[0][0]) <= 1 && FFABS(l1mv0[0][1]) <= 1)

  347.                    || (l1ref0[0]  < 0 && l1ref1[0] == 0 && FFABS(l1mv1[0][0]) <= 1 && FFABS(l1mv1[0][1]) <= 1

  348.                        && h->x264_build>33U))){

  349.                 a=b=0;

  350.                 if(ref[0] > 0)

  351.                     a= mv[0];

  352.                 if(ref[1] > 0)

  353.                     b= mv[1];

  354.             }else{

  355.                 a= mv[0];

  356.                 b= mv[1];

  357.             }

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

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

  360.         }else{

  361.             int n=0;

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

  363.                 const int x8 = i8&1;

  364.                 const int y8 = i8>>1;

  365. 

  366.                 if(is_b8x8 && !IS_DIRECT(h->sub_mb_type[i8]))

  367.                     continue;

  368.                 h->sub_mb_type[i8] = sub_mb_type;

  369. 

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

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

  372.                 fill_rectangle(&h->ref_cache[0][scan8[i8*4]], 2, 2, 8, (uint8_t)ref[0], 1);

  373.                 fill_rectangle(&h->ref_cache[1][scan8[i8*4]], 2, 2, 8, (uint8_t)ref[1], 1);

  374. 

  375.                 assert(b8_stride==2);

  376.                 /* col_zero_flag */

  377.                 if(!IS_INTRA(mb_type_col[0]) && !h->ref_list[1][0].long_ref && (   l1ref0[i8] == 0

  378.                                               || (l1ref0[i8] < 0 && l1ref1[i8] == 0

  379.                                                   && h->x264_build>33U))){

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

  381.                     if(IS_SUB_8X8(sub_mb_type)){

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

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

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

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

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

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

  388.                             n+=4;

  389.                         }

  390.                     }else{

  391.                         int m=0;

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

  393.                         const int16_t *mv_col = l1mv[x8*2 + (i4&1) + (y8*2 + (i4>>1))*b4_stride];

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

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

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

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

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

  399.                             m++;

  400.                         }

  401.                     }

  402.                     if(!(m&3))

  403.                         h->sub_mb_type[i8]+= MB_TYPE_16x16 - MB_TYPE_8x8;

  404.                     n+=m;

  405.                     }

  406.                 }

  407.             }

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

  409.                 *mb_type= (*mb_type & ~(MB_TYPE_8x8|MB_TYPE_16x8|MB_TYPE_8x16|MB_TYPE_P1L0|MB_TYPE_P1L1))|MB_TYPE_16x16|MB_TYPE_DIRECT2;

  410.         }

  411. }

  412. 

  413. static void pred_temp_direct_motion(H264Context * const h, int *mb_type){

  414.     MpegEncContext * const s = &h->s;

  415.     int b8_stride = 2;

  416.     int b4_stride = h->b_stride;

  417.     int mb_xy = h->mb_xy, mb_y = s->mb_y;

  418.     int mb_type_col[2];

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

  420.     const int8_t *l1ref0, *l1ref1;

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

  422.     unsigned int sub_mb_type;

  423.     int i8, i4;

  424. 

  425.     assert(h->ref_list[1][0].f.reference & 3);

  426. 

  427.     await_reference_mb_row(h, &h->ref_list[1][0], s->mb_y + !!IS_INTERLACED(*mb_type));

  428. 

  429.     if (IS_INTERLACED(h->ref_list[1][0].f.mb_type[mb_xy])) { // AFL/AFR/FR/FL -> AFL/FL

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

  431.             mb_y = (s->mb_y&~1) + h->col_parity;

  432.             mb_xy= s->mb_x + ((s->mb_y&~1) + h->col_parity)*s->mb_stride;

  433.             b8_stride = 0;

  434.         }else{

  435.             mb_y  += h->col_fieldoff;

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

  437.         }

  438.         goto single_col;

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

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

  441.             mb_y = s->mb_y&~1;

  442.             mb_xy= s->mb_x + (s->mb_y&~1)*s->mb_stride;

  443.             mb_type_col[0] = h->ref_list[1][0].f.mb_type[mb_xy];

  444.             mb_type_col[1] = h->ref_list[1][0].f.mb_type[mb_xy + s->mb_stride];

  445.             b8_stride = 2+4*s->mb_stride;

  446.             b4_stride *= 6;

  447.             if (IS_INTERLACED(mb_type_col[0]) != IS_INTERLACED(mb_type_col[1])) {

  448.                 mb_type_col[0] &= ~MB_TYPE_INTERLACED;

  449.                 mb_type_col[1] &= ~MB_TYPE_INTERLACED;

  450.             }

  451. 

  452.             sub_mb_type = MB_TYPE_16x16|MB_TYPE_P0L0|MB_TYPE_P0L1|MB_TYPE_DIRECT2; /* B_SUB_8x8 */

  453. 

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

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

  456.                 && !is_b8x8){

  457.                 *mb_type   |= MB_TYPE_16x8 |MB_TYPE_L0L1|MB_TYPE_DIRECT2; /* B_16x8 */

  458.             }else{

  459.                 *mb_type   |= MB_TYPE_8x8|MB_TYPE_L0L1;

  460.             }

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

  462. single_col:

  463.             mb_type_col[0] =

  464.             mb_type_col[1] = h->ref_list[1][0].f.mb_type[mb_xy];

  465. 

  466.             sub_mb_type = MB_TYPE_16x16|MB_TYPE_P0L0|MB_TYPE_P0L1|MB_TYPE_DIRECT2; /* B_SUB_8x8 */

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

  468.                 *mb_type   |= MB_TYPE_16x16|MB_TYPE_P0L0|MB_TYPE_P0L1|MB_TYPE_DIRECT2; /* B_16x16 */

  469.             }else if(!is_b8x8 && (mb_type_col[0] & (MB_TYPE_16x8|MB_TYPE_8x16))){

  470.                 *mb_type   |= MB_TYPE_L0L1|MB_TYPE_DIRECT2 | (mb_type_col[0] & (MB_TYPE_16x8|MB_TYPE_8x16));

  471.             }else{

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

  473.                     /* FIXME save sub mb types from previous frames (or derive from MVs)

  474.                     * so we know exactly what block size to use */

  475.                     sub_mb_type = MB_TYPE_8x8|MB_TYPE_P0L0|MB_TYPE_P0L1|MB_TYPE_DIRECT2; /* B_SUB_4x4 */

  476.                 }

  477.                 *mb_type   |= MB_TYPE_8x8|MB_TYPE_L0L1;

  478.             }

  479.         }

  480.     }

  481. 

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

  483. 

  484.     l1mv0  = &h->ref_list[1][0].f.motion_val[0][h->mb2b_xy [mb_xy]];

  485.     l1mv1  = &h->ref_list[1][0].f.motion_val[1][h->mb2b_xy [mb_xy]];

  486.     l1ref0 = &h->ref_list[1][0].f.ref_index [0][4 * mb_xy];

  487.     l1ref1 = &h->ref_list[1][0].f.ref_index [1][4 * mb_xy];

  488.     if(!b8_stride){

  489.         if(s->mb_y&1){

  490.             l1ref0 += 2;

  491.             l1ref1 += 2;

  492.             l1mv0  +=  2*b4_stride;

  493.             l1mv1  +=  2*b4_stride;

  494.         }

  495.     }

  496. 

  497.     {

  498.         const int *map_col_to_list0[2] = {h->map_col_to_list0[0], h->map_col_to_list0[1]};

  499.         const int *dist_scale_factor = h->dist_scale_factor;

  500.         int ref_offset;

  501. 

  502.         if(FRAME_MBAFF && IS_INTERLACED(*mb_type)){

  503.             map_col_to_list0[0] = h->map_col_to_list0_field[s->mb_y&1][0];

  504.             map_col_to_list0[1] = h->map_col_to_list0_field[s->mb_y&1][1];

  505.             dist_scale_factor   =h->dist_scale_factor_field[s->mb_y&1];

  506.         }

  507.         ref_offset = (h->ref_list[1][0].mbaff<<4) & (mb_type_col[0]>>3); //if(h->ref_list[1][0].mbaff && IS_INTERLACED(mb_type_col[0])) ref_offset=16 else 0

  508. 

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

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

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

  512. 

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

  514.                 const int x8 = i8&1;

  515.                 const int y8 = i8>>1;

  516.                 int ref0, scale;

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

  518. 

  519.                 if(is_b8x8 && !IS_DIRECT(h->sub_mb_type[i8]))

  520.                     continue;

  521.                 h->sub_mb_type[i8] = sub_mb_type;

  522. 

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

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

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

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

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

  528.                     continue;

  529.                 }

  530. 

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

  532.                 if(ref0 >= 0)

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

  534.                 else{

  535.                     ref0 = map_col_to_list0[1][l1ref1[x8 + y8*b8_stride] + ref_offset];

  536.                     l1mv= l1mv1;

  537.                 }

  538.                 scale = dist_scale_factor[ref0];

  539.                 fill_rectangle(&h->ref_cache[0][scan8[i8*4]], 2, 2, 8, ref0, 1);

  540. 

  541.                 {

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

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

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

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

  546.                     fill_rectangle(&h->mv_cache[0][scan8[i8*4]], 2, 2, 8, pack16to32(mx,my), 4);

  547.                     fill_rectangle(&h->mv_cache[1][scan8[i8*4]], 2, 2, 8, pack16to32(mx-mv_col[0],my-my_col), 4);

  548.                 }

  549.             }

  550.             return;

  551.         }

  552. 

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

  554. 

  555.         if(IS_16X16(*mb_type)){

  556.             int ref, mv0, mv1;

  557. 

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

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

  560.                 ref=mv0=mv1=0;

  561.             }else{

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

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

  564.                 const int scale = dist_scale_factor[ref0];

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

  566.                 int mv_l0[2];

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

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

  569.                 ref= ref0;

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

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

  572.             }

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

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

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

  576.         }else{

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

  578.                 const int x8 = i8&1;

  579.                 const int y8 = i8>>1;

  580.                 int ref0, scale;

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

  582. 

  583.                 if(is_b8x8 && !IS_DIRECT(h->sub_mb_type[i8]))

  584.                     continue;

  585.                 h->sub_mb_type[i8] = sub_mb_type;

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

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

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

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

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

  591.                     continue;

  592.                 }

  593. 

  594.                 assert(b8_stride == 2);

  595.                 ref0 = l1ref0[i8];

  596.                 if(ref0 >= 0)

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

  598.                 else{

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

  600.                     l1mv= l1mv1;

  601.                 }

  602.                 scale = dist_scale_factor[ref0];

  603. 

  604.                 fill_rectangle(&h->ref_cache[0][scan8[i8*4]], 2, 2, 8, ref0, 1);

  605.                 if(IS_SUB_8X8(sub_mb_type)){

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

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

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

  609.                     fill_rectangle(&h->mv_cache[0][scan8[i8*4]], 2, 2, 8, pack16to32(mx,my), 4);

  610.                     fill_rectangle(&h->mv_cache[1][scan8[i8*4]], 2, 2, 8, pack16to32(mx-mv_col[0],my-mv_col[1]), 4);

  611.                 }else

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

  613.                     const int16_t *mv_col = l1mv[x8*2 + (i4&1) + (y8*2 + (i4>>1))*b4_stride];

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

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

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

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

  618.                         pack16to32(mv_l0[0]-mv_col[0],mv_l0[1]-mv_col[1]));

  619.                 }

  620.             }

  621.         }

  622.     }

  623. }

  624. 

  625. void ff_h264_pred_direct_motion(H264Context * const h, int *mb_type){

  626.     if(h->direct_spatial_mv_pred){

  627.         pred_spatial_direct_motion(h, mb_type);

  628.     }else{

  629.         pred_temp_direct_motion(h, mb_type);

  630.     }

  631. }