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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 FFmpeg.

  8.  *

  9.  * FFmpeg 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.  * FFmpeg 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 FFmpeg; 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. static av_always_inline void vc1_scale_luma(uint8_t *srcY,

  36.                                             int k, int linesize)

  37. {

  38.     int i, j;

  39.     for (j = 0; j < k; j++) {

  40.         for (i = 0; i < k; i++)

  41.             srcY[i] = ((srcY[i] - 128) >> 1) + 128;

  42.         srcY += linesize;

  43.     }

  44. }

  45. 

  46. static av_always_inline void vc1_scale_chroma(uint8_t *srcU, uint8_t *srcV,

  47.                                               int k, int uvlinesize)

  48. {

  49.     int i, j;

  50.     for (j = 0; j < k; j++) {

  51.         for (i = 0; i < k; i++) {

  52.             srcU[i] = ((srcU[i] - 128) >> 1) + 128;

  53.             srcV[i] = ((srcV[i] - 128) >> 1) + 128;

  54.         }

  55.         srcU += uvlinesize;

  56.         srcV += uvlinesize;

  57.     }

  58. }

  59. 

  60. static av_always_inline void vc1_lut_scale_luma(uint8_t *srcY,

  61.                                                 uint8_t *lut1, uint8_t *lut2,

  62.                                                 int k, int linesize)

  63. {

  64.     int i, j;

  65. 

  66.     for (j = 0; j < k; j += 2) {

  67.         for (i = 0; i < k; i++)

  68.             srcY[i] = lut1[srcY[i]];

  69.         srcY += linesize;

  70. 

  71.         if (j + 1 == k)

  72.             break;

  73. 

  74.         for (i = 0; i < k; i++)

  75.             srcY[i] = lut2[srcY[i]];

  76.         srcY += linesize;

  77.     }

  78. }

  79. 

  80. static av_always_inline void vc1_lut_scale_chroma(uint8_t *srcU, uint8_t *srcV,

  81.                                                   uint8_t *lut1, uint8_t *lut2,

  82.                                                   int k, int uvlinesize)

  83. {

  84.     int i, j;

  85. 

  86.     for (j = 0; j < k; j += 2) {

  87.         for (i = 0; i < k; i++) {

  88.             srcU[i] = lut1[srcU[i]];

  89.             srcV[i] = lut1[srcV[i]];

  90.         }

  91.         srcU += uvlinesize;

  92.         srcV += uvlinesize;

  93. 

  94.         if (j + 1 == k)

  95.             break;

  96. 

  97.         for (i = 0; i < k; i++) {

  98.             srcU[i] = lut2[srcU[i]];

  99.             srcV[i] = lut2[srcV[i]];

  100.         }

  101.         srcU += uvlinesize;

  102.         srcV += uvlinesize;

  103.     }

  104. }

  105. 

  106. /** Do motion compensation over 1 macroblock

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

  108.  */

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

  110. {

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

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

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

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

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

  116.     int i;

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

  118.     int use_ic;

  119. 

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

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

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

  123.         return;

  124. 

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

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

  127. 

  128.     // store motion vectors for further use in B frames

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

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

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

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

  133.         }

  134.     }

  135. 

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

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

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

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

  140. 

  141.     if (v->field_mode &&

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

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

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

  145.     }

  146. 

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

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

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

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

  151.     }

  152.     if (!dir) {

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

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

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

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

  157.             luty  = v->curr_luty;

  158.             lutuv = v->curr_lutuv;

  159.             use_ic = *v->curr_use_ic;

  160.         } else {

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

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

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

  164.             luty  = v->last_luty;

  165.             lutuv = v->last_lutuv;

  166.             use_ic = v->last_use_ic;

  167.         }

  168.     } else {

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

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

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

  172.         luty  = v->next_luty;

  173.         lutuv = v->next_lutuv;

  174.         use_ic = v->next_use_ic;

  175.     }

  176. 

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

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

  179.         return;

  180.     }

  181. 

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

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

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

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

  186. 

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

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

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

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

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

  192.     } else {

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

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

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

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

  197.     }

  198. 

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

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

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

  202. 

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

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

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

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

  207.     }

  208. 

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

  210.     if (s->flags & CODEC_FLAG_GRAY) {

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

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

  213.     }

  214. 

  215.     if (v->rangeredfrm || use_ic

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

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

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

  219.         uint8_t *ubuf = s->edge_emu_buffer + 19 * s->linesize;

  220.         uint8_t *vbuf = ubuf + 9 * s->uvlinesize;

  221.         const int k = 17 + s->mspel * 2;

  222. 

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

  224.         s->vdsp.emulated_edge_mc(s->edge_emu_buffer, srcY,

  225.                                  s->linesize, s->linesize,

  226.                                  k, k,

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

  228.                                  s->h_edge_pos, v_edge_pos);

  229.         srcY = s->edge_emu_buffer;

  230.         s->vdsp.emulated_edge_mc(ubuf, srcU,

  231.                                  s->uvlinesize, s->uvlinesize,

  232.                                  8 + 1, 8 + 1,

  233.                                  uvsrc_x, uvsrc_y,

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

  235.         s->vdsp.emulated_edge_mc(vbuf, srcV,

  236.                                  s->uvlinesize, s->uvlinesize,

  237.                                  8 + 1, 8 + 1,

  238.                                  uvsrc_x, uvsrc_y,

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

  240.         srcU = ubuf;

  241.         srcV = vbuf;

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

  243.         if (v->rangeredfrm) {

  244.             vc1_scale_luma(srcY, k, s->linesize);

  245.             vc1_scale_chroma(srcU, srcV, 9, s->uvlinesize);

  246.         }

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

  248.         if (use_ic) {

  249.             vc1_lut_scale_luma(srcY,

  250.                                luty[v->field_mode ? v->ref_field_type[dir] : ((0 + src_y - s->mspel) & 1)],

  251.                                luty[v->field_mode ? v->ref_field_type[dir] : ((1 + src_y - s->mspel) & 1)],

  252.                                k, s->linesize);

  253.             vc1_lut_scale_chroma(srcU, srcV,

  254.                                  lutuv[v->field_mode ? v->ref_field_type[dir] : ((0 + uvsrc_y) & 1)],

  255.                                  lutuv[v->field_mode ? v->ref_field_type[dir] : ((1 + uvsrc_y) & 1)],

  256.                                  9, s->uvlinesize);

  257.         }

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

  259.     }

  260. 

  261.     if (s->mspel) {

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

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

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

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

  266.         if (!v->rnd)

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

  268.         else

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

  270.     }

  271. 

  272.     if (s->flags & CODEC_FLAG_GRAY) return;

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

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

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

  276.     if (!v->rnd) {

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

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

  279.     } else {

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

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

  282.     }

  283. }

  284. 

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

  286.  */

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

  288. {

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

  290.     uint8_t *srcY;

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

  292.     int off;

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

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

  295.     uint8_t (*luty)[256];

  296.     int use_ic;

  297. 

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

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

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

  301.         return;

  302. 

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

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

  305. 

  306.     if (!dir) {

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

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

  309.             luty = v->curr_luty;

  310.             use_ic = *v->curr_use_ic;

  311.         } else {

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

  313.             luty = v->last_luty;

  314.             use_ic = v->last_use_ic;

  315.         }

  316.     } else {

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

  318.         luty = v->next_luty;

  319.         use_ic = v->next_use_ic;

  320.     }

  321. 

  322.     if (!srcY) {

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

  324.         return;

  325.     }

  326. 

  327.     if (v->field_mode) {

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

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

  330.     }

  331. 

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

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

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

  335.         int tx, ty;

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

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

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

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

  340.             opp_count  += f;

  341.             same_count += 1 - f;

  342.         }

  343.         f = opp_count > same_count;

  344.         switch (f ? opp_count : same_count) {

  345.         case 4:

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

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

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

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

  350.             break;

  351.         case 3:

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

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

  354.             break;

  355.         case 2:

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

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

  358.             break;

  359.         default:

  360.             av_assert0(0);

  361.         }

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

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

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

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

  366.     }

  367. 

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

  369.         int qx, qy;

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

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

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

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

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

  375.         }

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

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

  378. 

  379.         if (qx < -17)

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

  381.         else if (qx > width)

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

  383.         if (qy < -18)

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

  385.         else if (qy > height + 1)

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

  387.     }

  388. 

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

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

  391.     else

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

  393. 

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

  395.     if (!fieldmv)

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

  397.     else

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

  399. 

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

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

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

  403.     } else {

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

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

  406.             if (src_y & 1)

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

  408.             else

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

  410.         } else {

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

  412.         }

  413.     }

  414. 

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

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

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

  418. 

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

  420.         v_edge_pos--;

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

  422.         src_y--;

  423.     if (v->rangeredfrm || use_ic

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

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

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

  427.         const int k = 9 + s->mspel * 2;

  428. 

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

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

  431.         s->vdsp.emulated_edge_mc(s->edge_emu_buffer, srcY,

  432.                                  s->linesize, s->linesize,

  433.                                  k, k << fieldmv,

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

  435.                                  s->h_edge_pos, v_edge_pos);

  436.         srcY = s->edge_emu_buffer;

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

  438.         if (v->rangeredfrm) {

  439.             vc1_scale_luma(srcY, k, s->linesize << fieldmv);

  440.         }

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

  442.         if (use_ic) {

  443.             vc1_lut_scale_luma(srcY,

  444.                                luty[v->field_mode ? v->ref_field_type[dir] : (((0<<fieldmv)+src_y - (s->mspel << fieldmv)) & 1)],

  445.                                luty[v->field_mode ? v->ref_field_type[dir] : (((1<<fieldmv)+src_y - (s->mspel << fieldmv)) & 1)],

  446.                                k, s->linesize << fieldmv);

  447.         }

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

  449.     }

  450. 

  451.     if (s->mspel) {

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

  453.         if (avg)

  454.             v->vc1dsp.avg_vc1_mspel_pixels_tab[1][dxy](s->dest[0] + off, srcY, s->linesize << fieldmv, v->rnd);

  455.         else

  456.             v->vc1dsp.put_vc1_mspel_pixels_tab[1][dxy](s->dest[0] + off, srcY, s->linesize << fieldmv, v->rnd);

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

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

  459.         if (!v->rnd)

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

  461.         else

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

  463.     }

  464. }

  465. 

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

  467. {

  468.     int idx, i;

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

  470. 

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

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

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

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

  475.     if (!idx) {

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

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

  478.         return 4;

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

  480.         switch (idx) {

  481.         case 0x1:

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

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

  484.             return 3;

  485.         case 0x2:

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

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

  488.             return 3;

  489.         case 0x4:

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

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

  492.             return 3;

  493.         case 0x8:

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

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

  496.             return 3;

  497.         }

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

  499.         int t1 = 0, t2 = 0;

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

  501.             if (!a[i]) {

  502.                 t1 = i;

  503.                 break;

  504.             }

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

  506.             if (!a[i]) {

  507.                 t2 = i;

  508.                 break;

  509.             }

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

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

  512.         return 2;

  513.     } else {

  514.         return 0;

  515.     }

  516.     return -1;

  517. }

  518. 

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

  520.  */

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

  522. {

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

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

  525.     uint8_t *srcU, *srcV;

  526.     int uvmx, uvmy, uvsrc_x, uvsrc_y;

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

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

  529.     int valid_count;

  530.     int chroma_ref_type = v->cur_field_type;

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

  532.     uint8_t (*lutuv)[256];

  533.     int use_ic;

  534. 

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

  536.         return;

  537.     if (s->flags & CODEC_FLAG_GRAY)

  538.         return;

  539. 

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

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

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

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

  544.         if (v->field_mode)

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

  546.     }

  547. 

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

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

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

  551.         chroma_ref_type = v->ref_field_type[dir];

  552.         if (!valid_count) {

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

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

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

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

  557.         }

  558.     } else {

  559.         int dominant = 0;

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

  561.             dominant = 1;

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

  563.         if (dominant)

  564.             chroma_ref_type = !v->cur_field_type;

  565.     }

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

  567.         return;

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

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

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

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

  572. 

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

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

  575. 

  576.     if (v->fastuvmc) {

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

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

  579.     }

  580.     // Field conversion bias

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

  582.         uvmy += 2 - 4 * chroma_ref_type;

  583. 

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

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

  586. 

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

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

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

  590.     } else {

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

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

  593.     }

  594. 

  595.     if (!dir) {

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

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

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

  599.             lutuv = v->curr_lutuv;

  600.             use_ic = *v->curr_use_ic;

  601.         } else {

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

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

  604.             lutuv = v->last_lutuv;

  605.             use_ic = v->last_use_ic;

  606.         }

  607.     } else {

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

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

  610.         lutuv = v->next_lutuv;

  611.         use_ic = v->next_use_ic;

  612.     }

  613. 

  614.     if (!srcU) {

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

  616.         return;

  617.     }

  618. 

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

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

  621. 

  622.     if (v->field_mode) {

  623.         if (chroma_ref_type) {

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

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

  626.         }

  627.     }

  628. 

  629.     if (v->rangeredfrm || use_ic

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

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

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

  633.         s->vdsp.emulated_edge_mc(s->edge_emu_buffer, srcU,

  634.                                  s->uvlinesize, s->uvlinesize,

  635.                                  8 + 1, 8 + 1, uvsrc_x, uvsrc_y,

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

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

  638.                                  s->uvlinesize, s->uvlinesize,

  639.                                  8 + 1, 8 + 1, uvsrc_x, uvsrc_y,

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

  641.         srcU = s->edge_emu_buffer;

  642.         srcV = s->edge_emu_buffer + 16;

  643. 

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

  645.         if (v->rangeredfrm) {

  646.             vc1_scale_chroma(srcU, srcV, 9, s->uvlinesize);

  647.         }

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

  649.         if (use_ic) {

  650.             vc1_lut_scale_chroma(srcU, srcV,

  651.                                  lutuv[v->field_mode ? chroma_ref_type : ((0 + uvsrc_y) & 1)],

  652.                                  lutuv[v->field_mode ? chroma_ref_type : ((1 + uvsrc_y) & 1)],

  653.                                  9, s->uvlinesize);

  654.         }

  655.     }

  656. 

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

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

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

  660.     if (!v->rnd) {

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

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

  663.     } else {

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

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

  666.     }

  667. }

  668. 

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

  670.  */

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

  672. {

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

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

  675.     uint8_t *srcU, *srcV;

  676.     int uvsrc_x, uvsrc_y;

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

  678.     int i, off, tx, ty;

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

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

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

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

  683.     int use_ic;

  684.     uint8_t (*lutuv)[256];

  685. 

  686.     if (s->flags & CODEC_FLAG_GRAY)

  687.         return;

  688. 

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

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

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

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

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

  694.         if (fieldmv)

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

  696.         else

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

  698.     }

  699. 

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

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

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

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

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

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

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

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

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

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

  710.             lutuv  = v->next_lutuv;

  711.             use_ic = v->next_use_ic;

  712.         } else {

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

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

  715.             lutuv  = v->last_lutuv;

  716.             use_ic = v->last_use_ic;

  717.         }

  718.         if (!srcU)

  719.             return;

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

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

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

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

  724. 

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

  726.             v_edge_pos = (s->v_edge_pos >> 1) - 1;

  727. 

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

  729.             uvsrc_y--;

  730.         if (use_ic

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

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

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

  734.             s->vdsp.emulated_edge_mc(s->edge_emu_buffer, srcU,

  735.                                      s->uvlinesize, s->uvlinesize,

  736.                                      5, (5 << fieldmv), uvsrc_x, uvsrc_y,

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

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

  739.                                      s->uvlinesize, s->uvlinesize,

  740.                                      5, (5 << fieldmv), uvsrc_x, uvsrc_y,

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

  742.             srcU = s->edge_emu_buffer;

  743.             srcV = s->edge_emu_buffer + 16;

  744. 

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

  746.             if (use_ic) {

  747.                 vc1_lut_scale_chroma(srcU, srcV,

  748.                                      lutuv[(uvsrc_y + (0 << fieldmv)) & 1],

  749.                                      lutuv[(uvsrc_y + (1 << fieldmv)) & 1],

  750.                                      5, s->uvlinesize << fieldmv);

  751.             }

  752.         }

  753.         if (avg) {

  754.             if (!v->rnd) {

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

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

  757.             } else {

  758.                 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]);

  759.                 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]);

  760.             }

  761.         } else {

  762.             if (!v->rnd) {

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

  764.                 h264chroma->put_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.put_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.put_no_rnd_vc1_chroma_pixels_tab[1](s->dest[2] + off, srcV, s->uvlinesize << fieldmv, 4, uvmx_field[i], uvmy_field[i]);

  768.             }

  769.         }

  770.     }

  771. }

  772. 

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

  774.  */

  775. void ff_vc1_interp_mc(VC1Context *v)

  776. {

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

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

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

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

  781.     int off, off_uv;

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

  783.     int use_ic = v->next_use_ic;

  784. 

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

  786.         return;

  787. 

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

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

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

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

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

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

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

  795.     }

  796.     if (v->fastuvmc) {

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

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

  799.     }

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

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

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

  803. 

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

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

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

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

  808. 

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

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

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

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

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

  814.     } else {

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

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

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

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

  819.     }

  820. 

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

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

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

  824. 

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

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

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

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

  829.     }

  830. 

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

  832.     if (s->flags & CODEC_FLAG_GRAY) {

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

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

  835.     }

  836. 

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

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

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

  840.         uint8_t *ubuf = s->edge_emu_buffer + 19 * s->linesize;

  841.         uint8_t *vbuf = ubuf + 9 * s->uvlinesize;

  842.         const int k = 17 + s->mspel * 2;

  843. 

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

  845.         s->vdsp.emulated_edge_mc(s->edge_emu_buffer, srcY,

  846.                                  s->linesize, s->linesize,

  847.                                  k, k,

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

  849.                                  s->h_edge_pos, v_edge_pos);

  850.         srcY = s->edge_emu_buffer;

  851.         s->vdsp.emulated_edge_mc(ubuf, srcU,

  852.                                  s->uvlinesize, s->uvlinesize,

  853.                                  8 + 1, 8 + 1,

  854.                                  uvsrc_x, uvsrc_y,

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

  856.         s->vdsp.emulated_edge_mc(vbuf, srcV,

  857.                                  s->uvlinesize, s->uvlinesize,

  858.                                  8 + 1, 8 + 1,

  859.                                  uvsrc_x, uvsrc_y,

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

  861.         srcU = ubuf;

  862.         srcV = vbuf;

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

  864.         if (v->rangeredfrm) {

  865.             vc1_scale_luma(srcY, k, s->linesize);

  866.             vc1_scale_chroma(srcU, srcV, 9, s->uvlinesize);

  867.         }

  868. 

  869.         if (use_ic) {

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

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

  872.             vc1_lut_scale_luma(srcY,

  873.                                luty[v->field_mode ? v->ref_field_type[1] : ((0+src_y - s->mspel) & 1)],

  874.                                luty[v->field_mode ? v->ref_field_type[1] : ((1+src_y - s->mspel) & 1)],

  875.                                k, s->linesize);

  876.             vc1_lut_scale_chroma(srcU, srcV,

  877.                                  lutuv[v->field_mode ? v->ref_field_type[1] : ((0+uvsrc_y) & 1)],

  878.                                  lutuv[v->field_mode ? v->ref_field_type[1] : ((1+uvsrc_y) & 1)],

  879.                                  9, s->uvlinesize);

  880.         }

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

  882.     }

  883. 

  884.     off    = 0;

  885.     off_uv = 0;

  886. 

  887.     if (s->mspel) {

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

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

  890.     } else { // hpel mc

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

  892. 

  893.         if (!v->rnd)

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

  895.         else

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

  897.     }

  898. 

  899.     if (s->flags & CODEC_FLAG_GRAY) return;

  900.     /* Chroma MC always uses qpel blilinear */

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

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

  903.     if (!v->rnd) {

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

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

  906.     } else {

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

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

  909.     }

  910. }