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FFmpeg/libavcodec/vc1_mc.c

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  1. /*

  2.  * VC-1 and WMV3 decoder

  3.  * Copyright (c) 2011 Mashiat Sarker Shakkhar

  4.  * Copyright (c) 2006-2007 Konstantin Shishkov

  5.  * Partly based on vc9.c (c) 2005 Anonymous, Alex Beregszaszi, Michael Niedermayer

  6.  *

  7.  * This file is part of Libav.

  8.  *

  9.  * Libav is free software; you can redistribute it and/or

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

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

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

  13.  *

  14.  * Libav is distributed in the hope that it will be useful,

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

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

  17.  * Lesser General Public License for more details.

  18.  *

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

  20.  * License along with Libav; if not, write to the Free Software

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

  22.  */

  23. 

  24. /**

  25.  * @file

  26.  * VC-1 and WMV3 block decoding routines

  27.  */

  28. 

  29. #include "avcodec.h"

  30. #include "h264chroma.h"

  31. #include "mathops.h"

  32. #include "mpegvideo.h"

  33. #include "vc1.h"

  34. 

  35. /** Do motion compensation over 1 macroblock

  36.  * Mostly adapted hpel_motion and qpel_motion from mpegvideo.c

  37.  */

  38. void ff_vc1_mc_1mv(VC1Context *v, int dir)

  39. {

  40.     MpegEncContext *s = &v->s;

  41.     H264ChromaContext *h264chroma = &v->h264chroma;

  42.     uint8_t *srcY, *srcU, *srcV;

  43.     int dxy, mx, my, uvmx, uvmy, src_x, src_y, uvsrc_x, uvsrc_y;

  44.     int v_edge_pos = s->v_edge_pos >> v->field_mode;

  45.     int i;

  46.     uint8_t (*luty)[256], (*lutuv)[256];

  47.     int use_ic;

  48. 

  49.     if ((!v->field_mode ||

  50.          (v->ref_field_type[dir] == 1 && v->cur_field_type == 1)) &&

  51.         !v->s.last_picture.f->data[0])

  52.         return;

  53. 

  54.     mx = s->mv[dir][0][0];

  55.     my = s->mv[dir][0][1];

  56. 

  57.     // store motion vectors for further use in B-frames

  58.     if (s->pict_type == AV_PICTURE_TYPE_P) {

  59.         for (i = 0; i < 4; i++) {

  60.             s->current_picture.motion_val[1][s->block_index[i] + v->blocks_off][0] = mx;

  61.             s->current_picture.motion_val[1][s->block_index[i] + v->blocks_off][1] = my;

  62.         }

  63.     }

  64. 

  65.     uvmx = (mx + ((mx & 3) == 3)) >> 1;

  66.     uvmy = (my + ((my & 3) == 3)) >> 1;

  67.     v->luma_mv[s->mb_x][0] = uvmx;

  68.     v->luma_mv[s->mb_x][1] = uvmy;

  69. 

  70.     if (v->field_mode &&

  71.         v->cur_field_type != v->ref_field_type[dir]) {

  72.         my   = my   - 2 + 4 * v->cur_field_type;

  73.         uvmy = uvmy - 2 + 4 * v->cur_field_type;

  74.     }

  75. 

  76.     // fastuvmc shall be ignored for interlaced frame picture

  77.     if (v->fastuvmc && (v->fcm != ILACE_FRAME)) {

  78.         uvmx = uvmx + ((uvmx < 0) ? (uvmx & 1) : -(uvmx & 1));

  79.         uvmy = uvmy + ((uvmy < 0) ? (uvmy & 1) : -(uvmy & 1));

  80.     }

  81.     if (!dir) {

  82.         if (v->field_mode && (v->cur_field_type != v->ref_field_type[dir]) && v->second_field) {

  83.             srcY = s->current_picture.f->data[0];

  84.             srcU = s->current_picture.f->data[1];

  85.             srcV = s->current_picture.f->data[2];

  86.             luty  = v->curr_luty;

  87.             lutuv = v->curr_lutuv;

  88.             use_ic = v->curr_use_ic;

  89.         } else {

  90.             srcY = s->last_picture.f->data[0];

  91.             srcU = s->last_picture.f->data[1];

  92.             srcV = s->last_picture.f->data[2];

  93.             luty  = v->last_luty;

  94.             lutuv = v->last_lutuv;

  95.             use_ic = v->last_use_ic;

  96.         }

  97.     } else {

  98.         srcY = s->next_picture.f->data[0];

  99.         srcU = s->next_picture.f->data[1];

  100.         srcV = s->next_picture.f->data[2];

  101.         luty  = v->next_luty;

  102.         lutuv = v->next_lutuv;

  103.         use_ic = v->next_use_ic;

  104.     }

  105. 

  106.     if (!srcY || !srcU) {

  107.         av_log(v->s.avctx, AV_LOG_ERROR, "Referenced frame missing.\n");

  108.         return;

  109.     }

  110. 

  111.     src_x   = s->mb_x * 16 + (mx   >> 2);

  112.     src_y   = s->mb_y * 16 + (my   >> 2);

  113.     uvsrc_x = s->mb_x *  8 + (uvmx >> 2);

  114.     uvsrc_y = s->mb_y *  8 + (uvmy >> 2);

  115. 

  116.     if (v->profile != PROFILE_ADVANCED) {

  117.         src_x   = av_clip(  src_x, -16, s->mb_width  * 16);

  118.         src_y   = av_clip(  src_y, -16, s->mb_height * 16);

  119.         uvsrc_x = av_clip(uvsrc_x,  -8, s->mb_width  *  8);

  120.         uvsrc_y = av_clip(uvsrc_y,  -8, s->mb_height *  8);

  121.     } else {

  122.         src_x   = av_clip(  src_x, -17, s->avctx->coded_width);

  123.         src_y   = av_clip(  src_y, -18, s->avctx->coded_height + 1);

  124.         uvsrc_x = av_clip(uvsrc_x,  -8, s->avctx->coded_width  >> 1);

  125.         uvsrc_y = av_clip(uvsrc_y,  -8, s->avctx->coded_height >> 1);

  126.     }

  127. 

  128.     srcY += src_y   * s->linesize   + src_x;

  129.     srcU += uvsrc_y * s->uvlinesize + uvsrc_x;

  130.     srcV += uvsrc_y * s->uvlinesize + uvsrc_x;

  131. 

  132.     if (v->field_mode && v->ref_field_type[dir]) {

  133.         srcY += s->current_picture_ptr->f->linesize[0];

  134.         srcU += s->current_picture_ptr->f->linesize[1];

  135.         srcV += s->current_picture_ptr->f->linesize[2];

  136.     }

  137. 

  138.     /* for grayscale we should not try to read from unknown area */

  139.     if (s->avctx->flags & AV_CODEC_FLAG_GRAY) {

  140.         srcU = s->sc.edge_emu_buffer + 18 * s->linesize;

  141.         srcV = s->sc.edge_emu_buffer + 18 * s->linesize;

  142.     }

  143. 

  144.     if (v->rangeredfrm || use_ic

  145.         || s->h_edge_pos < 22 || v_edge_pos < 22

  146.         || (unsigned)(src_x - s->mspel) > s->h_edge_pos - (mx&3) - 16 - s->mspel * 3

  147.         || (unsigned)(src_y - 1)        > v_edge_pos    - (my&3) - 16 - 3) {

  148.         uint8_t *uvbuf = s->sc.edge_emu_buffer + 19 * s->linesize;

  149. 

  150.         srcY -= s->mspel * (1 + s->linesize);

  151.         s->vdsp.emulated_edge_mc(s->sc.edge_emu_buffer, srcY,

  152.                                  s->linesize, s->linesize,

  153.                                  17 + s->mspel * 2, 17 + s->mspel * 2,

  154.                                  src_x - s->mspel, src_y - s->mspel,

  155.                                  s->h_edge_pos, v_edge_pos);

  156.         srcY = s->sc.edge_emu_buffer;

  157.         s->vdsp.emulated_edge_mc(uvbuf, srcU,

  158.                                  s->uvlinesize, s->uvlinesize,

  159.                                  8 + 1, 8 + 1,

  160.                                  uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, v_edge_pos >> 1);

  161.         s->vdsp.emulated_edge_mc(uvbuf + 16, srcV,

  162.                                  s->uvlinesize, s->uvlinesize,

  163.                                  8 + 1, 8 + 1,

  164.                                  uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, v_edge_pos >> 1);

  165.         srcU = uvbuf;

  166.         srcV = uvbuf + 16;

  167.         /* if we deal with range reduction we need to scale source blocks */

  168.         if (v->rangeredfrm) {

  169.             int i, j;

  170.             uint8_t *src, *src2;

  171. 

  172.             src = srcY;

  173.             for (j = 0; j < 17 + s->mspel * 2; j++) {

  174.                 for (i = 0; i < 17 + s->mspel * 2; i++)

  175.                     src[i] = ((src[i] - 128) >> 1) + 128;

  176.                 src += s->linesize;

  177.             }

  178.             src  = srcU;

  179.             src2 = srcV;

  180.             for (j = 0; j < 9; j++) {

  181.                 for (i = 0; i < 9; i++) {

  182.                     src[i]  = ((src[i]  - 128) >> 1) + 128;

  183.                     src2[i] = ((src2[i] - 128) >> 1) + 128;

  184.                 }

  185.                 src  += s->uvlinesize;

  186.                 src2 += s->uvlinesize;

  187.             }

  188.         }

  189.         /* if we deal with intensity compensation we need to scale source blocks */

  190.         if (use_ic) {

  191.             int i, j;

  192.             uint8_t *src, *src2;

  193. 

  194.             src = srcY;

  195.             for (j = 0; j < 17 + s->mspel * 2; j++) {

  196.                 int f = v->field_mode ? v->ref_field_type[dir] : ((j + src_y - s->mspel) & 1) ;

  197.                 for (i = 0; i < 17 + s->mspel * 2; i++)

  198.                     src[i] = luty[f][src[i]];

  199.                 src += s->linesize;

  200.             }

  201.             src  = srcU;

  202.             src2 = srcV;

  203.             for (j = 0; j < 9; j++) {

  204.                 int f = v->field_mode ? v->ref_field_type[dir] : ((j + uvsrc_y) & 1);

  205.                 for (i = 0; i < 9; i++) {

  206.                     src[i]  = lutuv[f][src[i]];

  207.                     src2[i] = lutuv[f][src2[i]];

  208.                 }

  209.                 src  += s->uvlinesize;

  210.                 src2 += s->uvlinesize;

  211.             }

  212.         }

  213.         srcY += s->mspel * (1 + s->linesize);

  214.     }

  215. 

  216.     if (s->mspel) {

  217.         dxy = ((my & 3) << 2) | (mx & 3);

  218.         v->vc1dsp.put_vc1_mspel_pixels_tab[dxy](s->dest[0]    , srcY    , s->linesize, v->rnd);

  219.         v->vc1dsp.put_vc1_mspel_pixels_tab[dxy](s->dest[0] + 8, srcY + 8, s->linesize, v->rnd);

  220.         srcY += s->linesize * 8;

  221.         v->vc1dsp.put_vc1_mspel_pixels_tab[dxy](s->dest[0] + 8 * s->linesize    , srcY    , s->linesize, v->rnd);

  222.         v->vc1dsp.put_vc1_mspel_pixels_tab[dxy](s->dest[0] + 8 * s->linesize + 8, srcY + 8, s->linesize, v->rnd);

  223.     } else { // hpel mc - always used for luma

  224.         dxy = (my & 2) | ((mx & 2) >> 1);

  225.         if (!v->rnd)

  226.             s->hdsp.put_pixels_tab[0][dxy](s->dest[0], srcY, s->linesize, 16);

  227.         else

  228.             s->hdsp.put_no_rnd_pixels_tab[0][dxy](s->dest[0], srcY, s->linesize, 16);

  229.     }

  230. 

  231.     if (s->avctx->flags & AV_CODEC_FLAG_GRAY)

  232.         return;

  233.     /* Chroma MC always uses qpel bilinear */

  234.     uvmx = (uvmx & 3) << 1;

  235.     uvmy = (uvmy & 3) << 1;

  236.     if (!v->rnd) {

  237.         h264chroma->put_h264_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);

  238.         h264chroma->put_h264_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);

  239.     } else {

  240.         v->vc1dsp.put_no_rnd_vc1_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);

  241.         v->vc1dsp.put_no_rnd_vc1_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);

  242.     }

  243. }

  244. 

  245. static inline int median4(int a, int b, int c, int d)

  246. {

  247.     if (a < b) {

  248.         if (c < d) return (FFMIN(b, d) + FFMAX(a, c)) / 2;

  249.         else       return (FFMIN(b, c) + FFMAX(a, d)) / 2;

  250.     } else {

  251.         if (c < d) return (FFMIN(a, d) + FFMAX(b, c)) / 2;

  252.         else       return (FFMIN(a, c) + FFMAX(b, d)) / 2;

  253.     }

  254. }

  255. 

  256. /** Do motion compensation for 4-MV macroblock - luminance block

  257.  */

  258. void ff_vc1_mc_4mv_luma(VC1Context *v, int n, int dir, int avg)

  259. {

  260.     MpegEncContext *s = &v->s;

  261.     uint8_t *srcY;

  262.     int dxy, mx, my, src_x, src_y;

  263.     int off;

  264.     int fieldmv = (v->fcm == ILACE_FRAME) ? v->blk_mv_type[s->block_index[n]] : 0;

  265.     int v_edge_pos = s->v_edge_pos >> v->field_mode;

  266.     uint8_t (*luty)[256];

  267.     int use_ic;

  268. 

  269.     if ((!v->field_mode ||

  270.          (v->ref_field_type[dir] == 1 && v->cur_field_type == 1)) &&

  271.         !v->s.last_picture.f->data[0])

  272.         return;

  273. 

  274.     mx = s->mv[dir][n][0];

  275.     my = s->mv[dir][n][1];

  276. 

  277.     if (!dir) {

  278.         if (v->field_mode && (v->cur_field_type != v->ref_field_type[dir]) && v->second_field) {

  279.             srcY = s->current_picture.f->data[0];

  280.             luty = v->curr_luty;

  281.             use_ic = v->curr_use_ic;

  282.         } else {

  283.             srcY = s->last_picture.f->data[0];

  284.             luty = v->last_luty;

  285.             use_ic = v->last_use_ic;

  286.         }

  287.     } else {

  288.         srcY = s->next_picture.f->data[0];

  289.         luty = v->next_luty;

  290.         use_ic = v->next_use_ic;

  291.     }

  292. 

  293.     if (!srcY) {

  294.         av_log(v->s.avctx, AV_LOG_ERROR, "Referenced frame missing.\n");

  295.         return;

  296.     }

  297. 

  298.     if (v->field_mode) {

  299.         if (v->cur_field_type != v->ref_field_type[dir])

  300.             my = my - 2 + 4 * v->cur_field_type;

  301.     }

  302. 

  303.     if (s->pict_type == AV_PICTURE_TYPE_P && n == 3 && v->field_mode) {

  304.         int same_count = 0, opp_count = 0, k;

  305.         int chosen_mv[2][4][2], f;

  306.         int tx = 0, ty = 0;

  307.         for (k = 0; k < 4; k++) {

  308.             f = v->mv_f[0][s->block_index[k] + v->blocks_off];

  309.             chosen_mv[f][f ? opp_count : same_count][0] = s->mv[0][k][0];

  310.             chosen_mv[f][f ? opp_count : same_count][1] = s->mv[0][k][1];

  311.             opp_count  += f;

  312.             same_count += 1 - f;

  313.         }

  314.         f = opp_count > same_count;

  315.         switch (f ? opp_count : same_count) {

  316.         case 4:

  317.             tx = median4(chosen_mv[f][0][0], chosen_mv[f][1][0],

  318.                          chosen_mv[f][2][0], chosen_mv[f][3][0]);

  319.             ty = median4(chosen_mv[f][0][1], chosen_mv[f][1][1],

  320.                          chosen_mv[f][2][1], chosen_mv[f][3][1]);

  321.             break;

  322.         case 3:

  323.             tx = mid_pred(chosen_mv[f][0][0], chosen_mv[f][1][0], chosen_mv[f][2][0]);

  324.             ty = mid_pred(chosen_mv[f][0][1], chosen_mv[f][1][1], chosen_mv[f][2][1]);

  325.             break;

  326.         case 2:

  327.             tx = (chosen_mv[f][0][0] + chosen_mv[f][1][0]) / 2;

  328.             ty = (chosen_mv[f][0][1] + chosen_mv[f][1][1]) / 2;

  329.             break;

  330.         }

  331.         s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][0] = tx;

  332.         s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][1] = ty;

  333.         for (k = 0; k < 4; k++)

  334.             v->mv_f[1][s->block_index[k] + v->blocks_off] = f;

  335.     }

  336. 

  337.     if (v->fcm == ILACE_FRAME) {  // not sure if needed for other types of picture

  338.         int qx, qy;

  339.         int width  = s->avctx->coded_width;

  340.         int height = s->avctx->coded_height >> 1;

  341.         if (s->pict_type == AV_PICTURE_TYPE_P) {

  342.             s->current_picture.motion_val[1][s->block_index[n] + v->blocks_off][0] = mx;

  343.             s->current_picture.motion_val[1][s->block_index[n] + v->blocks_off][1] = my;

  344.         }

  345.         qx = (s->mb_x * 16) + (mx >> 2);

  346.         qy = (s->mb_y *  8) + (my >> 3);

  347. 

  348.         if (qx < -17)

  349.             mx -= 4 * (qx + 17);

  350.         else if (qx > width)

  351.             mx -= 4 * (qx - width);

  352.         if (qy < -18)

  353.             my -= 8 * (qy + 18);

  354.         else if (qy > height + 1)

  355.             my -= 8 * (qy - height - 1);

  356.     }

  357. 

  358.     if ((v->fcm == ILACE_FRAME) && fieldmv)

  359.         off = ((n > 1) ? s->linesize : 0) + (n & 1) * 8;

  360.     else

  361.         off = s->linesize * 4 * (n & 2) + (n & 1) * 8;

  362. 

  363.     src_x = s->mb_x * 16 + (n & 1) * 8 + (mx >> 2);

  364.     if (!fieldmv)

  365.         src_y = s->mb_y * 16 + (n & 2) * 4 + (my >> 2);

  366.     else

  367.         src_y = s->mb_y * 16 + ((n > 1) ? 1 : 0) + (my >> 2);

  368. 

  369.     if (v->profile != PROFILE_ADVANCED) {

  370.         src_x = av_clip(src_x, -16, s->mb_width  * 16);

  371.         src_y = av_clip(src_y, -16, s->mb_height * 16);

  372.     } else {

  373.         src_x = av_clip(src_x, -17, s->avctx->coded_width);

  374.         if (v->fcm == ILACE_FRAME) {

  375.             if (src_y & 1)

  376.                 src_y = av_clip(src_y, -17, s->avctx->coded_height + 1);

  377.             else

  378.                 src_y = av_clip(src_y, -18, s->avctx->coded_height);

  379.         } else {

  380.             src_y = av_clip(src_y, -18, s->avctx->coded_height + 1);

  381.         }

  382.     }

  383. 

  384.     srcY += src_y * s->linesize + src_x;

  385.     if (v->field_mode && v->ref_field_type[dir])

  386.         srcY += s->current_picture_ptr->f->linesize[0];

  387. 

  388.     if (fieldmv && !(src_y & 1))

  389.         v_edge_pos--;

  390.     if (fieldmv && (src_y & 1) && src_y < 4)

  391.         src_y--;

  392.     if (v->rangeredfrm || use_ic

  393.         || s->h_edge_pos < 13 || v_edge_pos < 23

  394.         || (unsigned)(src_x - s->mspel) > s->h_edge_pos - (mx & 3) - 8 - s->mspel * 2

  395.         || (unsigned)(src_y - (s->mspel << fieldmv)) > v_edge_pos - (my & 3) - ((8 + s->mspel * 2) << fieldmv)) {

  396.         srcY -= s->mspel * (1 + (s->linesize << fieldmv));

  397.         /* check emulate edge stride and offset */

  398.         s->vdsp.emulated_edge_mc(s->sc.edge_emu_buffer, srcY,

  399.                                  s->linesize, s->linesize,

  400.                                  9 + s->mspel * 2, (9 + s->mspel * 2) << fieldmv,

  401.                                  src_x - s->mspel, src_y - (s->mspel << fieldmv),

  402.                                  s->h_edge_pos, v_edge_pos);

  403.         srcY = s->sc.edge_emu_buffer;

  404.         /* if we deal with range reduction we need to scale source blocks */

  405.         if (v->rangeredfrm) {

  406.             int i, j;

  407.             uint8_t *src;

  408. 

  409.             src = srcY;

  410.             for (j = 0; j < 9 + s->mspel * 2; j++) {

  411.                 for (i = 0; i < 9 + s->mspel * 2; i++)

  412.                     src[i] = ((src[i] - 128) >> 1) + 128;

  413.                 src += s->linesize << fieldmv;

  414.             }

  415.         }

  416.         /* if we deal with intensity compensation we need to scale source blocks */

  417.         if (use_ic) {

  418.             int i, j;

  419.             uint8_t *src;

  420. 

  421.             src = srcY;

  422.             for (j = 0; j < 9 + s->mspel * 2; j++) {

  423.                 int f = v->field_mode ? v->ref_field_type[dir] : (((j<<fieldmv)+src_y - (s->mspel << fieldmv)) & 1);

  424.                 for (i = 0; i < 9 + s->mspel * 2; i++)

  425.                     src[i] = luty[f][src[i]];

  426.                 src += s->linesize << fieldmv;

  427.             }

  428.         }

  429.         srcY += s->mspel * (1 + (s->linesize << fieldmv));

  430.     }

  431. 

  432.     if (s->mspel) {

  433.         dxy = ((my & 3) << 2) | (mx & 3);

  434.         if (avg)

  435.             v->vc1dsp.avg_vc1_mspel_pixels_tab[dxy](s->dest[0] + off, srcY, s->linesize << fieldmv, v->rnd);

  436.         else

  437.             v->vc1dsp.put_vc1_mspel_pixels_tab[dxy](s->dest[0] + off, srcY, s->linesize << fieldmv, v->rnd);

  438.     } else { // hpel mc - always used for luma

  439.         dxy = (my & 2) | ((mx & 2) >> 1);

  440.         if (!v->rnd)

  441.             s->hdsp.put_pixels_tab[1][dxy](s->dest[0] + off, srcY, s->linesize, 8);

  442.         else

  443.             s->hdsp.put_no_rnd_pixels_tab[1][dxy](s->dest[0] + off, srcY, s->linesize, 8);

  444.     }

  445. }

  446. 

  447. static av_always_inline int get_chroma_mv(int *mvx, int *mvy, int *a, int flag, int *tx, int *ty)

  448. {

  449.     int idx, i;

  450.     static const int count[16] = { 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4};

  451. 

  452.     idx =  ((a[3] != flag) << 3)

  453.          | ((a[2] != flag) << 2)

  454.          | ((a[1] != flag) << 1)

  455.          |  (a[0] != flag);

  456.     if (!idx) {

  457.         *tx = median4(mvx[0], mvx[1], mvx[2], mvx[3]);

  458.         *ty = median4(mvy[0], mvy[1], mvy[2], mvy[3]);

  459.         return 4;

  460.     } else if (count[idx] == 1) {

  461.         switch (idx) {

  462.         case 0x1:

  463.             *tx = mid_pred(mvx[1], mvx[2], mvx[3]);

  464.             *ty = mid_pred(mvy[1], mvy[2], mvy[3]);

  465.             return 3;

  466.         case 0x2:

  467.             *tx = mid_pred(mvx[0], mvx[2], mvx[3]);

  468.             *ty = mid_pred(mvy[0], mvy[2], mvy[3]);

  469.             return 3;

  470.         case 0x4:

  471.             *tx = mid_pred(mvx[0], mvx[1], mvx[3]);

  472.             *ty = mid_pred(mvy[0], mvy[1], mvy[3]);

  473.             return 3;

  474.         case 0x8:

  475.             *tx = mid_pred(mvx[0], mvx[1], mvx[2]);

  476.             *ty = mid_pred(mvy[0], mvy[1], mvy[2]);

  477.             return 3;

  478.         }

  479.     } else if (count[idx] == 2) {

  480.         int t1 = 0, t2 = 0;

  481.         for (i = 0; i < 3; i++)

  482.             if (!a[i]) {

  483.                 t1 = i;

  484.                 break;

  485.             }

  486.         for (i = t1 + 1; i < 4; i++)

  487.             if (!a[i]) {

  488.                 t2 = i;

  489.                 break;

  490.             }

  491.         *tx = (mvx[t1] + mvx[t2]) / 2;

  492.         *ty = (mvy[t1] + mvy[t2]) / 2;

  493.         return 2;

  494.     } else {

  495.         return 0;

  496.     }

  497.     return -1;

  498. }

  499. 

  500. /** Do motion compensation for 4-MV macroblock - both chroma blocks

  501.  */

  502. void ff_vc1_mc_4mv_chroma(VC1Context *v, int dir)

  503. {

  504.     MpegEncContext *s = &v->s;

  505.     H264ChromaContext *h264chroma = &v->h264chroma;

  506.     uint8_t *srcU, *srcV;

  507.     int uvmx, uvmy, uvsrc_x, uvsrc_y;

  508.     int k, tx = 0, ty = 0;

  509.     int mvx[4], mvy[4], intra[4], mv_f[4];

  510.     int valid_count;

  511.     int chroma_ref_type = v->cur_field_type;

  512.     int v_edge_pos = s->v_edge_pos >> v->field_mode;

  513.     uint8_t (*lutuv)[256];

  514.     int use_ic;

  515. 

  516.     if (!v->field_mode && !v->s.last_picture.f->data[0])

  517.         return;

  518.     if (s->avctx->flags & AV_CODEC_FLAG_GRAY)

  519.         return;

  520. 

  521.     for (k = 0; k < 4; k++) {

  522.         mvx[k] = s->mv[dir][k][0];

  523.         mvy[k] = s->mv[dir][k][1];

  524.         intra[k] = v->mb_type[0][s->block_index[k]];

  525.         if (v->field_mode)

  526.             mv_f[k] = v->mv_f[dir][s->block_index[k] + v->blocks_off];

  527.     }

  528. 

  529.     /* calculate chroma MV vector from four luma MVs */

  530.     if (!v->field_mode || (v->field_mode && !v->numref)) {

  531.         valid_count = get_chroma_mv(mvx, mvy, intra, 0, &tx, &ty);

  532.         chroma_ref_type = v->reffield;

  533.         if (!valid_count) {

  534.             s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][0] = 0;

  535.             s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][1] = 0;

  536.             v->luma_mv[s->mb_x][0] = v->luma_mv[s->mb_x][1] = 0;

  537.             return; //no need to do MC for intra blocks

  538.         }

  539.     } else {

  540.         int dominant = 0;

  541.         if (mv_f[0] + mv_f[1] + mv_f[2] + mv_f[3] > 2)

  542.             dominant = 1;

  543.         valid_count = get_chroma_mv(mvx, mvy, mv_f, dominant, &tx, &ty);

  544.         if (dominant)

  545.             chroma_ref_type = !v->cur_field_type;

  546.     }

  547.     if (v->field_mode && chroma_ref_type == 1 && v->cur_field_type == 1 && !v->s.last_picture.f->data[0])

  548.         return;

  549.     s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][0] = tx;

  550.     s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][1] = ty;

  551.     uvmx = (tx + ((tx & 3) == 3)) >> 1;

  552.     uvmy = (ty + ((ty & 3) == 3)) >> 1;

  553. 

  554.     v->luma_mv[s->mb_x][0] = uvmx;

  555.     v->luma_mv[s->mb_x][1] = uvmy;

  556. 

  557.     if (v->fastuvmc) {

  558.         uvmx = uvmx + ((uvmx < 0) ? (uvmx & 1) : -(uvmx & 1));

  559.         uvmy = uvmy + ((uvmy < 0) ? (uvmy & 1) : -(uvmy & 1));

  560.     }

  561.     // Field conversion bias

  562.     if (v->cur_field_type != chroma_ref_type)

  563.         uvmy += 2 - 4 * chroma_ref_type;

  564. 

  565.     uvsrc_x = s->mb_x * 8 + (uvmx >> 2);

  566.     uvsrc_y = s->mb_y * 8 + (uvmy >> 2);

  567. 

  568.     if (v->profile != PROFILE_ADVANCED) {

  569.         uvsrc_x = av_clip(uvsrc_x, -8, s->mb_width  * 8);

  570.         uvsrc_y = av_clip(uvsrc_y, -8, s->mb_height * 8);

  571.     } else {

  572.         uvsrc_x = av_clip(uvsrc_x, -8, s->avctx->coded_width  >> 1);

  573.         uvsrc_y = av_clip(uvsrc_y, -8, s->avctx->coded_height >> 1);

  574.     }

  575. 

  576.     if (!dir) {

  577.         if (v->field_mode && (v->cur_field_type != chroma_ref_type) && v->second_field) {

  578.             srcU = s->current_picture.f->data[1];

  579.             srcV = s->current_picture.f->data[2];

  580.             lutuv = v->curr_lutuv;

  581.             use_ic = v->curr_use_ic;

  582.         } else {

  583.             srcU = s->last_picture.f->data[1];

  584.             srcV = s->last_picture.f->data[2];

  585.             lutuv = v->last_lutuv;

  586.             use_ic = v->last_use_ic;

  587.         }

  588.     } else {

  589.         srcU = s->next_picture.f->data[1];

  590.         srcV = s->next_picture.f->data[2];

  591.         lutuv = v->next_lutuv;

  592.         use_ic = v->next_use_ic;

  593.     }

  594. 

  595.     if (!srcU) {

  596.         av_log(v->s.avctx, AV_LOG_ERROR, "Referenced frame missing.\n");

  597.         return;

  598.     }

  599. 

  600.     srcU += uvsrc_y * s->uvlinesize + uvsrc_x;

  601.     srcV += uvsrc_y * s->uvlinesize + uvsrc_x;

  602. 

  603.     if (v->field_mode) {

  604.         if (chroma_ref_type) {

  605.             srcU += s->current_picture_ptr->f->linesize[1];

  606.             srcV += s->current_picture_ptr->f->linesize[2];

  607.         }

  608.     }

  609. 

  610.     if (v->rangeredfrm || use_ic

  611.         || s->h_edge_pos < 18 || v_edge_pos < 18

  612.         || (unsigned)uvsrc_x > (s->h_edge_pos >> 1) - 9

  613.         || (unsigned)uvsrc_y > (v_edge_pos    >> 1) - 9) {

  614.         s->vdsp.emulated_edge_mc(s->sc.edge_emu_buffer, srcU,

  615.                                  s->uvlinesize, s->uvlinesize,

  616.                                  8 + 1, 8 + 1, uvsrc_x, uvsrc_y,

  617.                                  s->h_edge_pos >> 1, v_edge_pos >> 1);

  618.         s->vdsp.emulated_edge_mc(s->sc.edge_emu_buffer + 16, srcV,

  619.                                  s->uvlinesize, s->uvlinesize,

  620.                                  8 + 1, 8 + 1, uvsrc_x, uvsrc_y,

  621.                                  s->h_edge_pos >> 1, v_edge_pos >> 1);

  622.         srcU = s->sc.edge_emu_buffer;

  623.         srcV = s->sc.edge_emu_buffer + 16;

  624. 

  625.         /* if we deal with range reduction we need to scale source blocks */

  626.         if (v->rangeredfrm) {

  627.             int i, j;

  628.             uint8_t *src, *src2;

  629. 

  630.             src  = srcU;

  631.             src2 = srcV;

  632.             for (j = 0; j < 9; j++) {

  633.                 for (i = 0; i < 9; i++) {

  634.                     src[i]  = ((src[i]  - 128) >> 1) + 128;

  635.                     src2[i] = ((src2[i] - 128) >> 1) + 128;

  636.                 }

  637.                 src  += s->uvlinesize;

  638.                 src2 += s->uvlinesize;

  639.             }

  640.         }

  641.         /* if we deal with intensity compensation we need to scale source blocks */

  642.         if (use_ic) {

  643.             int i, j;

  644.             uint8_t *src, *src2;

  645. 

  646.             src  = srcU;

  647.             src2 = srcV;

  648.             for (j = 0; j < 9; j++) {

  649.                 int f = v->field_mode ? chroma_ref_type : ((j + uvsrc_y) & 1);

  650.                 for (i = 0; i < 9; i++) {

  651.                     src[i]  = lutuv[f][src[i]];

  652.                     src2[i] = lutuv[f][src2[i]];

  653.                 }

  654.                 src  += s->uvlinesize;

  655.                 src2 += s->uvlinesize;

  656.             }

  657.         }

  658.     }

  659. 

  660.     /* Chroma MC always uses qpel bilinear */

  661.     uvmx = (uvmx & 3) << 1;

  662.     uvmy = (uvmy & 3) << 1;

  663.     if (!v->rnd) {

  664.         h264chroma->put_h264_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);

  665.         h264chroma->put_h264_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);

  666.     } else {

  667.         v->vc1dsp.put_no_rnd_vc1_chroma_pixels_tab[0](s->dest[1], srcU, s->uvlinesize, 8, uvmx, uvmy);

  668.         v->vc1dsp.put_no_rnd_vc1_chroma_pixels_tab[0](s->dest[2], srcV, s->uvlinesize, 8, uvmx, uvmy);

  669.     }

  670. }

  671. 

  672. /** Do motion compensation for 4-MV interlaced frame chroma macroblock (both U and V)

  673.  */

  674. void ff_vc1_mc_4mv_chroma4(VC1Context *v, int dir, int dir2, int avg)

  675. {

  676.     MpegEncContext *s = &v->s;

  677.     H264ChromaContext *h264chroma = &v->h264chroma;

  678.     uint8_t *srcU, *srcV;

  679.     int uvsrc_x, uvsrc_y;

  680.     int uvmx_field[4], uvmy_field[4];

  681.     int i, off, tx, ty;

  682.     int fieldmv = v->blk_mv_type[s->block_index[0]];

  683.     static const int s_rndtblfield[16] = { 0, 0, 1, 2, 4, 4, 5, 6, 2, 2, 3, 8, 6, 6, 7, 12 };

  684.     int v_dist = fieldmv ? 1 : 4; // vertical offset for lower sub-blocks

  685.     int v_edge_pos = s->v_edge_pos >> 1;

  686.     int use_ic;

  687.     uint8_t (*lutuv)[256];

  688. 

  689.     if (s->avctx->flags & AV_CODEC_FLAG_GRAY)

  690.         return;

  691. 

  692.     for (i = 0; i < 4; i++) {

  693.         int d = i < 2 ? dir: dir2;

  694.         tx = s->mv[d][i][0];

  695.         uvmx_field[i] = (tx + ((tx & 3) == 3)) >> 1;

  696.         ty = s->mv[d][i][1];

  697.         if (fieldmv)

  698.             uvmy_field[i] = (ty >> 4) * 8 + s_rndtblfield[ty & 0xF];

  699.         else

  700.             uvmy_field[i] = (ty + ((ty & 3) == 3)) >> 1;

  701.     }

  702. 

  703.     for (i = 0; i < 4; i++) {

  704.         off = (i & 1) * 4 + ((i & 2) ? v_dist * s->uvlinesize : 0);

  705.         uvsrc_x = s->mb_x * 8 +  (i & 1) * 4           + (uvmx_field[i] >> 2);

  706.         uvsrc_y = s->mb_y * 8 + ((i & 2) ? v_dist : 0) + (uvmy_field[i] >> 2);

  707.         // FIXME: implement proper pull-back (see vc1cropmv.c, vc1CROPMV_ChromaPullBack())

  708.         uvsrc_x = av_clip(uvsrc_x, -8, s->avctx->coded_width  >> 1);

  709.         uvsrc_y = av_clip(uvsrc_y, -8, s->avctx->coded_height >> 1);

  710.         if (i < 2 ? dir : dir2) {

  711.             srcU = s->next_picture.f->data[1] + uvsrc_y * s->uvlinesize + uvsrc_x;

  712.             srcV = s->next_picture.f->data[2] + uvsrc_y * s->uvlinesize + uvsrc_x;

  713.             lutuv  = v->next_lutuv;

  714.             use_ic = v->next_use_ic;

  715.         } else {

  716.             srcU = s->last_picture.f->data[1] + uvsrc_y * s->uvlinesize + uvsrc_x;

  717.             srcV = s->last_picture.f->data[2] + uvsrc_y * s->uvlinesize + uvsrc_x;

  718.             lutuv  = v->last_lutuv;

  719.             use_ic = v->last_use_ic;

  720.         }

  721.         uvmx_field[i] = (uvmx_field[i] & 3) << 1;

  722.         uvmy_field[i] = (uvmy_field[i] & 3) << 1;

  723. 

  724.         if (fieldmv && !(uvsrc_y & 1))

  725.             v_edge_pos--;

  726.         if (fieldmv && (uvsrc_y & 1) && uvsrc_y < 2)

  727.             uvsrc_y--;

  728.         if (use_ic

  729.             || s->h_edge_pos < 10 || v_edge_pos < (5 << fieldmv)

  730.             || (unsigned)uvsrc_x > (s->h_edge_pos >> 1) - 5

  731.             || (unsigned)uvsrc_y > v_edge_pos - (5 << fieldmv)) {

  732.             s->vdsp.emulated_edge_mc(s->sc.edge_emu_buffer, srcU,

  733.                                      s->uvlinesize, s->uvlinesize,

  734.                                      5, (5 << fieldmv), uvsrc_x, uvsrc_y,

  735.                                      s->h_edge_pos >> 1, v_edge_pos);

  736.             s->vdsp.emulated_edge_mc(s->sc.edge_emu_buffer + 16, srcV,

  737.                                      s->uvlinesize, s->uvlinesize,

  738.                                      5, (5 << fieldmv), uvsrc_x, uvsrc_y,

  739.                                      s->h_edge_pos >> 1, v_edge_pos);

  740.             srcU = s->sc.edge_emu_buffer;

  741.             srcV = s->sc.edge_emu_buffer + 16;

  742. 

  743.             /* if we deal with intensity compensation we need to scale source blocks */

  744.             if (use_ic) {

  745.                 int i, j;

  746.                 uint8_t *src, *src2;

  747. 

  748.                 src  = srcU;

  749.                 src2 = srcV;

  750.                 for (j = 0; j < 5; j++) {

  751.                     int f = (uvsrc_y + (j << fieldmv)) & 1;

  752.                     for (i = 0; i < 5; i++) {

  753.                         src[i]  = lutuv[f][src[i]];

  754.                         src2[i] = lutuv[f][src2[i]];

  755.                     }

  756.                     src  += s->uvlinesize << fieldmv;

  757.                     src2 += s->uvlinesize << fieldmv;

  758.                 }

  759.             }

  760.         }

  761.         if (avg) {

  762.             if (!v->rnd) {

  763.                 h264chroma->avg_h264_chroma_pixels_tab[1](s->dest[1] + off, srcU, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);

  764.                 h264chroma->avg_h264_chroma_pixels_tab[1](s->dest[2] + off, srcV, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);

  765.             } else {

  766.                 v->vc1dsp.avg_no_rnd_vc1_chroma_pixels_tab[1](s->dest[1] + off, srcU, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);

  767.                 v->vc1dsp.avg_no_rnd_vc1_chroma_pixels_tab[1](s->dest[2] + off, srcV, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);

  768.             }

  769.         } else {

  770.             if (!v->rnd) {

  771.                 h264chroma->put_h264_chroma_pixels_tab[1](s->dest[1] + off, srcU, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);

  772.                 h264chroma->put_h264_chroma_pixels_tab[1](s->dest[2] + off, srcV, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);

  773.             } else {

  774.                 v->vc1dsp.put_no_rnd_vc1_chroma_pixels_tab[1](s->dest[1] + off, srcU, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);

  775.                 v->vc1dsp.put_no_rnd_vc1_chroma_pixels_tab[1](s->dest[2] + off, srcV, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);

  776.             }

  777.         }

  778.     }

  779. }

  780. 

  781. /** Motion compensation for direct or interpolated blocks in B-frames

  782.  */

  783. void ff_vc1_interp_mc(VC1Context *v)

  784. {

  785.     MpegEncContext *s = &v->s;

  786.     H264ChromaContext *h264chroma = &v->h264chroma;

  787.     uint8_t *srcY, *srcU, *srcV;

  788.     int dxy, mx, my, uvmx, uvmy, src_x, src_y, uvsrc_x, uvsrc_y;

  789.     int off, off_uv;

  790.     int v_edge_pos = s->v_edge_pos >> v->field_mode;

  791.     int use_ic = v->next_use_ic;

  792. 

  793.     if (!v->field_mode && !v->s.next_picture.f->data[0])

  794.         return;

  795. 

  796.     mx   = s->mv[1][0][0];

  797.     my   = s->mv[1][0][1];

  798.     uvmx = (mx + ((mx & 3) == 3)) >> 1;

  799.     uvmy = (my + ((my & 3) == 3)) >> 1;

  800.     if (v->field_mode && v->cur_field_type != v->ref_field_type[1]) {

  801.         my   = my   - 2 + 4 * v->cur_field_type;

  802.         uvmy = uvmy - 2 + 4 * v->cur_field_type;

  803.     }

  804.     if (v->fastuvmc) {

  805.         uvmx = uvmx + ((uvmx < 0) ? -(uvmx & 1) : (uvmx & 1));

  806.         uvmy = uvmy + ((uvmy < 0) ? -(uvmy & 1) : (uvmy & 1));

  807.     }

  808.     srcY = s->next_picture.f->data[0];

  809.     srcU = s->next_picture.f->data[1];

  810.     srcV = s->next_picture.f->data[2];

  811. 

  812.     src_x   = s->mb_x * 16 + (mx   >> 2);

  813.     src_y   = s->mb_y * 16 + (my   >> 2);

  814.     uvsrc_x = s->mb_x *  8 + (uvmx >> 2);

  815.     uvsrc_y = s->mb_y *  8 + (uvmy >> 2);

  816. 

  817.     if (v->profile != PROFILE_ADVANCED) {

  818.         src_x   = av_clip(  src_x, -16, s->mb_width  * 16);

  819.         src_y   = av_clip(  src_y, -16, s->mb_height * 16);

  820.         uvsrc_x = av_clip(uvsrc_x,  -8, s->mb_width  *  8);

  821.         uvsrc_y = av_clip(uvsrc_y,  -8, s->mb_height *  8);

  822.     } else {

  823.         src_x   = av_clip(  src_x, -17, s->avctx->coded_width);

  824.         src_y   = av_clip(  src_y, -18, s->avctx->coded_height + 1);

  825.         uvsrc_x = av_clip(uvsrc_x,  -8, s->avctx->coded_width  >> 1);

  826.         uvsrc_y = av_clip(uvsrc_y,  -8, s->avctx->coded_height >> 1);

  827.     }

  828. 

  829.     srcY += src_y   * s->linesize   + src_x;

  830.     srcU += uvsrc_y * s->uvlinesize + uvsrc_x;

  831.     srcV += uvsrc_y * s->uvlinesize + uvsrc_x;

  832. 

  833.     if (v->field_mode && v->ref_field_type[1]) {

  834.         srcY += s->current_picture_ptr->f->linesize[0];

  835.         srcU += s->current_picture_ptr->f->linesize[1];

  836.         srcV += s->current_picture_ptr->f->linesize[2];

  837.     }

  838. 

  839.     /* for grayscale we should not try to read from unknown area */

  840.     if (s->avctx->flags & AV_CODEC_FLAG_GRAY) {

  841.         srcU = s->sc.edge_emu_buffer + 18 * s->linesize;

  842.         srcV = s->sc.edge_emu_buffer + 18 * s->linesize;

  843.     }

  844. 

  845.     if (v->rangeredfrm || s->h_edge_pos < 22 || v_edge_pos < 22 || use_ic

  846.         || (unsigned)(src_x - 1) > s->h_edge_pos - (mx & 3) - 16 - 3

  847.         || (unsigned)(src_y - 1) > v_edge_pos    - (my & 3) - 16 - 3) {

  848.         uint8_t *uvbuf = s->sc.edge_emu_buffer + 19 * s->linesize;

  849. 

  850.         srcY -= s->mspel * (1 + s->linesize);

  851.         s->vdsp.emulated_edge_mc(s->sc.edge_emu_buffer, srcY,

  852.                                  s->linesize, s->linesize,

  853.                                  17 + s->mspel * 2, 17 + s->mspel * 2,

  854.                                  src_x - s->mspel, src_y - s->mspel,

  855.                                  s->h_edge_pos, v_edge_pos);

  856.         srcY = s->sc.edge_emu_buffer;

  857.         s->vdsp.emulated_edge_mc(uvbuf, srcU,

  858.                                  s->uvlinesize, s->uvlinesize,

  859.                                  8 + 1, 8 + 1,

  860.                                  uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, v_edge_pos >> 1);

  861.         s->vdsp.emulated_edge_mc(uvbuf + 16, srcV,

  862.                                  s->uvlinesize, s->uvlinesize,

  863.                                  8 + 1, 8 + 1,

  864.                                  uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, v_edge_pos >> 1);

  865.         srcU = uvbuf;

  866.         srcV = uvbuf + 16;

  867.         /* if we deal with range reduction we need to scale source blocks */

  868.         if (v->rangeredfrm) {

  869.             int i, j;

  870.             uint8_t *src, *src2;

  871. 

  872.             src = srcY;

  873.             for (j = 0; j < 17 + s->mspel * 2; j++) {

  874.                 for (i = 0; i < 17 + s->mspel * 2; i++)

  875.                     src[i] = ((src[i] - 128) >> 1) + 128;

  876.                 src += s->linesize;

  877.             }

  878.             src = srcU;

  879.             src2 = srcV;

  880.             for (j = 0; j < 9; j++) {

  881.                 for (i = 0; i < 9; i++) {

  882.                     src[i]  = ((src[i]  - 128) >> 1) + 128;

  883.                     src2[i] = ((src2[i] - 128) >> 1) + 128;

  884.                 }

  885.                 src  += s->uvlinesize;

  886.                 src2 += s->uvlinesize;

  887.             }

  888.         }

  889. 

  890.         if (use_ic) {

  891.             uint8_t (*luty )[256] = v->next_luty;

  892.             uint8_t (*lutuv)[256] = v->next_lutuv;

  893.             int i, j;

  894.             uint8_t *src, *src2;

  895. 

  896.             src = srcY;

  897.             for (j = 0; j < 17 + s->mspel * 2; j++) {

  898.                 int f = v->field_mode ? v->ref_field_type[1] : ((j+src_y - s->mspel) & 1);

  899.                 for (i = 0; i < 17 + s->mspel * 2; i++)

  900.                     src[i] = luty[f][src[i]];

  901.                 src += s->linesize;

  902.             }

  903.             src  = srcU;

  904.             src2 = srcV;

  905.             for (j = 0; j < 9; j++) {

  906.                 int f = v->field_mode ? v->ref_field_type[1] : ((j+uvsrc_y) & 1);

  907.                 for (i = 0; i < 9; i++) {

  908.                     src[i]  = lutuv[f][src[i]];

  909.                     src2[i] = lutuv[f][src2[i]];

  910.                 }

  911.                 src  += s->uvlinesize;

  912.                 src2 += s->uvlinesize;

  913.             }

  914.         }

  915.         srcY += s->mspel * (1 + s->linesize);

  916.     }

  917. 

  918.     off    = 0;

  919.     off_uv = 0;

  920. 

  921.     if (s->mspel) {

  922.         dxy = ((my & 3) << 2) | (mx & 3);

  923.         v->vc1dsp.avg_vc1_mspel_pixels_tab[dxy](s->dest[0] + off    , srcY    , s->linesize, v->rnd);

  924.         v->vc1dsp.avg_vc1_mspel_pixels_tab[dxy](s->dest[0] + off + 8, srcY + 8, s->linesize, v->rnd);

  925.         srcY += s->linesize * 8;

  926.         v->vc1dsp.avg_vc1_mspel_pixels_tab[dxy](s->dest[0] + off + 8 * s->linesize    , srcY    , s->linesize, v->rnd);

  927.         v->vc1dsp.avg_vc1_mspel_pixels_tab[dxy](s->dest[0] + off + 8 * s->linesize + 8, srcY + 8, s->linesize, v->rnd);

  928.     } else { // hpel mc

  929.         dxy = (my & 2) | ((mx & 2) >> 1);

  930. 

  931.         if (!v->rnd)

  932.             s->hdsp.avg_pixels_tab[0][dxy](s->dest[0] + off, srcY, s->linesize, 16);

  933.         else

  934.             s->hdsp.avg_no_rnd_pixels_tab[dxy](s->dest[0] + off, srcY, s->linesize, 16);

  935.     }

  936. 

  937.     if (s->avctx->flags & AV_CODEC_FLAG_GRAY)

  938.         return;

  939.     /* Chroma MC always uses qpel bilinear */

  940.     uvmx = (uvmx & 3) << 1;

  941.     uvmy = (uvmy & 3) << 1;

  942.     if (!v->rnd) {

  943.         h264chroma->avg_h264_chroma_pixels_tab[0](s->dest[1] + off_uv, srcU, s->uvlinesize, 8, uvmx, uvmy);

  944.         h264chroma->avg_h264_chroma_pixels_tab[0](s->dest[2] + off_uv, srcV, s->uvlinesize, 8, uvmx, uvmy);

  945.     } else {

  946.         v->vc1dsp.avg_no_rnd_vc1_chroma_pixels_tab[0](s->dest[1] + off_uv, srcU, s->uvlinesize, 8, uvmx, uvmy);

  947.         v->vc1dsp.avg_no_rnd_vc1_chroma_pixels_tab[0](s->dest[2] + off_uv, srcV, s->uvlinesize, 8, uvmx, uvmy);

  948.     }

  949. }