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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. 

  35. //#undef NDEBUG

  36. #include <assert.h>

  37. 

  38. 

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

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

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

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

  43.         return 256;

  44.     }else{

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

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

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

  48.     }

  49. }

  50. 

  51. void ff_h264_direct_dist_scale_factor(H264Context * const h){

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

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

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

  55.     int i, field;

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

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

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

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

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

  61.     }

  62. 

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

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

  65.     }

  66. }

  67. 

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

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

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

  71.     int j, old_ref, rfield;

  72.     int start= mbafi ? 16                      : 0;

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

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

  75. 

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

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

  78. 

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

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

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

  82. 

  83.             if     (!interl)

  84.                 poc |= 3;

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

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

  87. 

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

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

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

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

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

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

  94.                     break;

  95.                 }

  96.             }

  97.         }

  98.     }

  99. }

  100. 

  101. void ff_h264_direct_ref_list_init(H264Context * const h){

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

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

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

  105.     int list, j, field;

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

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

  108. 

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

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

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

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

  113.     }

  114. 

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

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

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

  118.     }

  119. 

  120.     cur->mbaff= FRAME_MBAFF;

  121. 

  122.     h->col_fieldoff= 0;

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

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

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

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

  127.         ref1sidx=sidx= h->col_parity;

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

  129.         h->col_fieldoff= s->mb_stride*(2*(h->ref_list[1][0].reference) - 3);

  130.     }

  131. 

  132.     if(cur->pict_type != FF_B_TYPE || h->direct_spatial_mv_pred)

  133.         return;

  134. 

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

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

  137.         if(FRAME_MBAFF)

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

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

  140.     }

  141. }

  142. 

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

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

  145.     int b8_stride = 2;

  146.     int b4_stride = h->b_stride;

  147.     int mb_xy = h->mb_xy;

  148.     int mb_type_col[2];

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

  150.     const int8_t *l1ref0, *l1ref1;

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

  152.     unsigned int sub_mb_type= MB_TYPE_L0L1;

  153.     int i8, i4;

  154.     int ref[2];

  155.     int mv[2];

  156.     int list;

  157. 

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

  159. 

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

  161. 

  162. 

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

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

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

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

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

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

  169.         if(refc == PART_NOT_AVAILABLE){

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

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

  172.         }

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

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

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

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

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

  178. 

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

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

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

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

  183.             }else {

  184.                 assert(match_count==1);

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

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

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

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

  189.                 }else{

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

  191.                 }

  192.             }

  193.         }else{

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

  195.             mv[list] = 0;

  196.             ref[list] = -1;

  197.             if(!is_b8x8)

  198.                 *mb_type &= mask;

  199.             sub_mb_type &= mask;

  200.         }

  201.     }

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

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

  204.         if(!is_b8x8)

  205.             *mb_type |= MB_TYPE_L0L1;

  206.         sub_mb_type |= MB_TYPE_L0L1;

  207.     }

  208. 

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

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

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

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

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

  214.         *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;

  215.         return;

  216.     }

  217. 

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

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

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

  221.             b8_stride = 0;

  222.         }else{

  223.             mb_xy += h->col_fieldoff; // non zero for FL -> FL & differ parity

  224.         }

  225.         goto single_col;

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

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

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

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

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

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

  232.             b4_stride *= 6;

  233. 

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

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

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

  237.                 && !is_b8x8){

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

  239.             }else{

  240.                 *mb_type   |= MB_TYPE_8x8;

  241.             }

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

  243. single_col:

  244.             mb_type_col[0] =

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

  246. 

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

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

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

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

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

  252.             }else{

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

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

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

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

  257.                 }

  258.                 *mb_type   |= MB_TYPE_8x8;

  259.             }

  260.         }

  261.     }

  262. 

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

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

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

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

  267.     if(!b8_stride){

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

  269.             l1ref0 += 2;

  270.             l1ref1 += 2;

  271.             l1mv0  +=  2*b4_stride;

  272.             l1mv1  +=  2*b4_stride;

  273.         }

  274.     }

  275. 

  276. 

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

  278.             int n=0;

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

  280.                 int x8 = i8&1;

  281.                 int y8 = i8>>1;

  282.                 int xy8 = x8+y8*b8_stride;

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

  284.                 int a,b;

  285. 

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

  287.                     continue;

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

  289. 

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

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

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

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

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

  295.                     a=b=0;

  296.                     if(ref[0] > 0)

  297.                         a= mv[0];

  298.                     if(ref[1] > 0)

  299.                         b= mv[1];

  300.                     n++;

  301.                 }else{

  302.                     a= mv[0];

  303.                     b= mv[1];

  304.                 }

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

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

  307.             }

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

  309.                 *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;

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

  311.             int a,b;

  312. 

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

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

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

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

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

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

  319.                 a=b=0;

  320.                 if(ref[0] > 0)

  321.                     a= mv[0];

  322.                 if(ref[1] > 0)

  323.                     b= mv[1];

  324.             }else{

  325.                 a= mv[0];

  326.                 b= mv[1];

  327.             }

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

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

  330.         }else{

  331.             int n=0;

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

  333.                 const int x8 = i8&1;

  334.                 const int y8 = i8>>1;

  335. 

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

  337.                     continue;

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

  339. 

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

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

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

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

  344. 

  345.                 assert(b8_stride==2);

  346.                 /* col_zero_flag */

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

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

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

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

  351.                     if(IS_SUB_8X8(sub_mb_type)){

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

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

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

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

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

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

  358.                             n+=4;

  359.                         }

  360.                     }else{

  361.                         int m=0;

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

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

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

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

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

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

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

  369.                             m++;

  370.                         }

  371.                     }

  372.                     if(!(m&3))

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

  374.                     n+=m;

  375.                     }

  376.                 }

  377.             }

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

  379.                 *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;

  380.         }

  381. }

  382. 

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

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

  385.     int b8_stride = 2;

  386.     int b4_stride = h->b_stride;

  387.     int mb_xy = h->mb_xy;

  388.     int mb_type_col[2];

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

  390.     const int8_t *l1ref0, *l1ref1;

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

  392.     unsigned int sub_mb_type;

  393.     int i8, i4;

  394. 

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

  396. 

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

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

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

  400.             b8_stride = 0;

  401.         }else{

  402.             mb_xy += h->col_fieldoff; // non zero for FL -> FL & differ parity

  403.         }

  404.         goto single_col;

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

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

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

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

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

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

  411.             b4_stride *= 6;

  412. 

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

  414. 

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

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

  417.                 && !is_b8x8){

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

  419.             }else{

  420.                 *mb_type   |= MB_TYPE_8x8|MB_TYPE_L0L1;

  421.             }

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

  423. single_col:

  424.             mb_type_col[0] =

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

  426. 

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

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

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

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

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

  432.             }else{

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

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

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

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

  437.                 }

  438.                 *mb_type   |= MB_TYPE_8x8|MB_TYPE_L0L1;

  439.             }

  440.         }

  441.     }

  442. 

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

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

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

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

  447.     if(!b8_stride){

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

  449.             l1ref0 += 2;

  450.             l1ref1 += 2;

  451.             l1mv0  +=  2*b4_stride;

  452.             l1mv1  +=  2*b4_stride;

  453.         }

  454.     }

  455. 

  456.     {

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

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

  459.         int ref_offset;

  460. 

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

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

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

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

  465.         }

  466.         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

  467. 

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

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

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

  471. 

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

  473.                 const int x8 = i8&1;

  474.                 const int y8 = i8>>1;

  475.                 int ref0, scale;

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

  477. 

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

  479.                     continue;

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

  481. 

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

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

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

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

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

  487.                     continue;

  488.                 }

  489. 

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

  491.                 if(ref0 >= 0)

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

  493.                 else{

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

  495.                     l1mv= l1mv1;

  496.                 }

  497.                 scale = dist_scale_factor[ref0];

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

  499. 

  500.                 {

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

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

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

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

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

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

  507.                 }

  508.             }

  509.             return;

  510.         }

  511. 

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

  513. 

  514.         if(IS_16X16(*mb_type)){

  515.             int ref, mv0, mv1;

  516. 

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

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

  519.                 ref=mv0=mv1=0;

  520.             }else{

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

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

  523.                 const int scale = dist_scale_factor[ref0];

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

  525.                 int mv_l0[2];

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

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

  528.                 ref= ref0;

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

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

  531.             }

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

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

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

  535.         }else{

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

  537.                 const int x8 = i8&1;

  538.                 const int y8 = i8>>1;

  539.                 int ref0, scale;

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

  541. 

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

  543.                     continue;

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

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

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

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

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

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

  550.                     continue;

  551.                 }

  552. 

  553.                 assert(b8_stride == 2);

  554.                 ref0 = l1ref0[i8];

  555.                 if(ref0 >= 0)

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

  557.                 else{

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

  559.                     l1mv= l1mv1;

  560.                 }

  561.                 scale = dist_scale_factor[ref0];

  562. 

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

  564.                 if(IS_SUB_8X8(sub_mb_type)){

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

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

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

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

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

  570.                 }else

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

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

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

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

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

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

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

  578.                 }

  579.             }

  580.         }

  581.     }

  582. }

  583. 

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

  585.     if(h->direct_spatial_mv_pred){

  586.         pred_spatial_direct_motion(h, mb_type);

  587.     }else{

  588.         pred_temp_direct_motion(h, mb_type);

  589.     }

  590. }