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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. static const uint8_t popcount4[16] = { 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4 };

  107. 

  108. static av_always_inline int get_luma_mv(VC1Context *v, int dir, int16_t *tx, int16_t *ty)

  109. {

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

  111.     int idx = v->mv_f[dir][s->block_index[0] + v->blocks_off] |

  112.              (v->mv_f[dir][s->block_index[1] + v->blocks_off] << 1) |

  113.              (v->mv_f[dir][s->block_index[2] + v->blocks_off] << 2) |

  114.              (v->mv_f[dir][s->block_index[3] + v->blocks_off] << 3);

  115.     static const uint8_t index2[16] = { 0, 0, 0, 0x23, 0, 0x13, 0x03, 0, 0, 0x12, 0x02, 0, 0x01, 0, 0, 0 };

  116.     int opp_count = popcount4[idx];

  117. 

  118.     switch (opp_count) {

  119.     case 0:

  120.     case 4:

  121.         *tx = median4(s->mv[dir][0][0], s->mv[dir][1][0], s->mv[dir][2][0], s->mv[dir][3][0]);

  122.         *ty = median4(s->mv[dir][0][1], s->mv[dir][1][1], s->mv[dir][2][1], s->mv[dir][3][1]);

  123.         break;

  124.     case 1:

  125.         *tx = mid_pred(s->mv[dir][idx < 2][0], s->mv[dir][1 + (idx < 4)][0], s->mv[dir][2 + (idx < 8)][0]);

  126.         *ty = mid_pred(s->mv[dir][idx < 2][1], s->mv[dir][1 + (idx < 4)][1], s->mv[dir][2 + (idx < 8)][1]);

  127.         break;

  128.     case 3:

  129.         *tx = mid_pred(s->mv[dir][idx > 0xd][0], s->mv[dir][1 + (idx > 0xb)][0], s->mv[dir][2 + (idx > 0x7)][0]);

  130.         *ty = mid_pred(s->mv[dir][idx > 0xd][1], s->mv[dir][1 + (idx > 0xb)][1], s->mv[dir][2 + (idx > 0x7)][1]);

  131.         break;

  132.     case 2:

  133.         *tx = (s->mv[dir][index2[idx] >> 4][0] + s->mv[dir][index2[idx] & 0xf][0]) / 2;

  134.         *ty = (s->mv[dir][index2[idx] >> 4][1] + s->mv[dir][index2[idx] & 0xf][1]) / 2;

  135.         break;

  136.     }

  137.     return opp_count;

  138. }

  139. 

  140. static av_always_inline int get_chroma_mv(VC1Context *v, int dir, int16_t *tx, int16_t *ty)

  141. {

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

  143.     int idx = !v->mb_type[0][s->block_index[0]] |

  144.              (!v->mb_type[0][s->block_index[1]] << 1) |

  145.              (!v->mb_type[0][s->block_index[2]] << 2) |

  146.              (!v->mb_type[0][s->block_index[3]] << 3);

  147.     static const uint8_t index2[16] = { 0, 0, 0, 0x01, 0, 0x02, 0x12, 0, 0, 0x03, 0x13, 0, 0x23, 0, 0, 0 };

  148.     int valid_count = popcount4[idx];

  149. 

  150.     switch (valid_count) {

  151.     case 4:

  152.         *tx = median4(s->mv[dir][0][0], s->mv[dir][1][0], s->mv[dir][2][0], s->mv[dir][3][0]);

  153.         *ty = median4(s->mv[dir][0][1], s->mv[dir][1][1], s->mv[dir][2][1], s->mv[dir][3][1]);

  154.         break;

  155.     case 3:

  156.         *tx = mid_pred(s->mv[dir][idx > 0xd][0], s->mv[dir][1 + (idx > 0xb)][0], s->mv[dir][2 + (idx > 0x7)][0]);

  157.         *ty = mid_pred(s->mv[dir][idx > 0xd][1], s->mv[dir][1 + (idx > 0xb)][1], s->mv[dir][2 + (idx > 0x7)][1]);

  158.         break;

  159.     case 2:

  160.         *tx = (s->mv[dir][index2[idx] >> 4][0] + s->mv[dir][index2[idx] & 0xf][0]) / 2;

  161.         *ty = (s->mv[dir][index2[idx] >> 4][1] + s->mv[dir][index2[idx] & 0xf][1]) / 2;

  162.         break;

  163.     default:

  164.         return 0;

  165.     }

  166.     return valid_count;

  167. }

  168. 

  169. /** Do motion compensation over 1 macroblock

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

  171.  */

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

  173. {

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

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

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

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

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

  179.     int i;

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

  181.     int use_ic;

  182. 

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

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

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

  186.         return;

  187. 

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

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

  190. 

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

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

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

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

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

  196.         }

  197.     }

  198. 

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

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

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

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

  203. 

  204.     if (v->field_mode &&

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

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

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

  208.     }

  209. 

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

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

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

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

  214.     }

  215.     if (!dir) {

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

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

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

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

  220.             luty  = v->curr_luty;

  221.             lutuv = v->curr_lutuv;

  222.             use_ic = *v->curr_use_ic;

  223.         } else {

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

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

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

  227.             luty  = v->last_luty;

  228.             lutuv = v->last_lutuv;

  229.             use_ic = v->last_use_ic;

  230.         }

  231.     } else {

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

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

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

  235.         luty  = v->next_luty;

  236.         lutuv = v->next_lutuv;

  237.         use_ic = v->next_use_ic;

  238.     }

  239. 

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

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

  242.         return;

  243.     }

  244. 

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

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

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

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

  249. 

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

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

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

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

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

  255.     } else {

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

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

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

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

  260.     }

  261. 

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

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

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

  265. 

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

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

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

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

  270.     }

  271. 

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

  273.     if (CONFIG_GRAY && s->flags & CODEC_FLAG_GRAY) {

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

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

  276.     }

  277. 

  278.     if (v->rangeredfrm || use_ic

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

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

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

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

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

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

  285. 

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

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

  288.                                  s->linesize, s->linesize,

  289.                                  k, k,

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

  291.                                  s->h_edge_pos, v_edge_pos);

  292.         srcY = s->edge_emu_buffer;

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

  294.                                  s->uvlinesize, s->uvlinesize,

  295.                                  8 + 1, 8 + 1,

  296.                                  uvsrc_x, uvsrc_y,

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

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

  299.                                  s->uvlinesize, s->uvlinesize,

  300.                                  8 + 1, 8 + 1,

  301.                                  uvsrc_x, uvsrc_y,

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

  303.         srcU = ubuf;

  304.         srcV = vbuf;

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

  306.         if (v->rangeredfrm) {

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

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

  309.         }

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

  311.         if (use_ic) {

  312.             vc1_lut_scale_luma(srcY,

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

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

  315.                                k, s->linesize);

  316.             vc1_lut_scale_chroma(srcU, srcV,

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

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

  319.                                  9, s->uvlinesize);

  320.         }

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

  322.     }

  323. 

  324.     if (s->mspel) {

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

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

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

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

  329.         if (!v->rnd)

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

  331.         else

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

  333.     }

  334. 

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

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

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

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

  339.     if (!v->rnd) {

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

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

  342.     } else {

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

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

  345.     }

  346. }

  347. 

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

  349.  */

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

  351. {

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

  353.     uint8_t *srcY;

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

  355.     int off;

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

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

  358.     uint8_t (*luty)[256];

  359.     int use_ic;

  360. 

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

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

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

  364.         return;

  365. 

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

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

  368. 

  369.     if (!dir) {

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

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

  372.             luty = v->curr_luty;

  373.             use_ic = *v->curr_use_ic;

  374.         } else {

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

  376.             luty = v->last_luty;

  377.             use_ic = v->last_use_ic;

  378.         }

  379.     } else {

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

  381.         luty = v->next_luty;

  382.         use_ic = v->next_use_ic;

  383.     }

  384. 

  385.     if (!srcY) {

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

  387.         return;

  388.     }

  389. 

  390.     if (v->field_mode) {

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

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

  393.     }

  394. 

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

  396.         int opp_count = get_luma_mv(v, 0,

  397.                                     &s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][0],

  398.                                     &s->current_picture.motion_val[1][s->block_index[0] + v->blocks_off][1]);

  399.         int k, f = opp_count > 2;

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

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

  402.     }

  403. 

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

  405.         int qx, qy;

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

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

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

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

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

  411.         }

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

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

  414. 

  415.         if (qx < -17)

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

  417.         else if (qx > width)

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

  419.         if (qy < -18)

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

  421.         else if (qy > height + 1)

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

  423.     }

  424. 

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

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

  427.     else

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

  429. 

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

  431.     if (!fieldmv)

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

  433.     else

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

  435. 

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

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

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

  439.     } else {

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

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

  442.             if (src_y & 1)

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

  444.             else

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

  446.         } else {

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

  448.         }

  449.     }

  450. 

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

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

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

  454. 

  455.     if (fieldmv) {

  456.         if (!(src_y & 1))

  457.             v_edge_pos--;

  458.         else

  459.             src_y -= (src_y < 4);

  460.     }

  461.     if (v->rangeredfrm || use_ic

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

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

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

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

  466. 

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

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

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

  470.                                  s->linesize, s->linesize,

  471.                                  k, k << fieldmv,

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

  473.                                  s->h_edge_pos, v_edge_pos);

  474.         srcY = s->edge_emu_buffer;

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

  476.         if (v->rangeredfrm) {

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

  478.         }

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

  480.         if (use_ic) {

  481.             vc1_lut_scale_luma(srcY,

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

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

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

  485.         }

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

  487.     }

  488. 

  489.     if (s->mspel) {

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

  491.         if (avg)

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

  493.         else

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

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

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

  497.         if (!v->rnd)

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

  499.         else

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

  501.     }

  502. }

  503. 

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

  505.  */

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

  507. {

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

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

  510.     uint8_t *srcU, *srcV;

  511.     int uvmx, uvmy, uvsrc_x, uvsrc_y;

  512.     int16_t tx, ty;

  513.     int chroma_ref_type;

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

  515.     uint8_t (*lutuv)[256];

  516.     int use_ic;

  517. 

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

  519.         return;

  520.     if (CONFIG_GRAY && s->flags & CODEC_FLAG_GRAY)

  521.         return;

  522. 

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

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

  525.         int valid_count = get_chroma_mv(v, dir, &tx, &ty);

  526.         if (!valid_count) {

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

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

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

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

  531.         }

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

  533.     } else {

  534.         int opp_count = get_luma_mv(v, dir, &tx, &ty);

  535.         chroma_ref_type = v->cur_field_type ^ (opp_count > 2);

  536.     }

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

  538.         return;

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

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

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

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

  543. 

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

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

  546. 

  547.     if (v->fastuvmc) {

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

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

  550.     }

  551.     // Field conversion bias

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

  553.         uvmy += 2 - 4 * chroma_ref_type;

  554. 

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

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

  557. 

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

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

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

  561.     } else {

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

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

  564.     }

  565. 

  566.     if (!dir) {

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

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

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

  570.             lutuv = v->curr_lutuv;

  571.             use_ic = *v->curr_use_ic;

  572.         } else {

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

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

  575.             lutuv = v->last_lutuv;

  576.             use_ic = v->last_use_ic;

  577.         }

  578.     } else {

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

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

  581.         lutuv = v->next_lutuv;

  582.         use_ic = v->next_use_ic;

  583.     }

  584. 

  585.     if (!srcU) {

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

  587.         return;

  588.     }

  589. 

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

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

  592. 

  593.     if (v->field_mode) {

  594.         if (chroma_ref_type) {

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

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

  597.         }

  598.     }

  599. 

  600.     if (v->rangeredfrm || use_ic

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

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

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

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

  605.                                  s->uvlinesize, s->uvlinesize,

  606.                                  8 + 1, 8 + 1, uvsrc_x, uvsrc_y,

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

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

  609.                                  s->uvlinesize, s->uvlinesize,

  610.                                  8 + 1, 8 + 1, uvsrc_x, uvsrc_y,

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

  612.         srcU = s->edge_emu_buffer;

  613.         srcV = s->edge_emu_buffer + 16;

  614. 

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

  616.         if (v->rangeredfrm) {

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

  618.         }

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

  620.         if (use_ic) {

  621.             vc1_lut_scale_chroma(srcU, srcV,

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

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

  624.                                  9, s->uvlinesize);

  625.         }

  626.     }

  627. 

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

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

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

  631.     if (!v->rnd) {

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

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

  634.     } else {

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

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

  637.     }

  638. }

  639. 

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

  641.  */

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

  643. {

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

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

  646.     uint8_t *srcU, *srcV;

  647.     int uvsrc_x, uvsrc_y;

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

  649.     int i, off, tx, ty;

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

  651.     static const uint8_t s_rndtblfield[16] = { 0, 0, 1, 2, 4, 4, 5, 6, 2, 2, 3, 8, 6, 6, 7, 12 };

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

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

  654.     int use_ic;

  655.     uint8_t (*lutuv)[256];

  656. 

  657.     if (CONFIG_GRAY && s->flags & CODEC_FLAG_GRAY)

  658.         return;

  659. 

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

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

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

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

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

  665.         if (fieldmv)

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

  667.         else

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

  669.     }

  670. 

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

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

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

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

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

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

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

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

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

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

  681.             lutuv  = v->next_lutuv;

  682.             use_ic = v->next_use_ic;

  683.         } else {

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

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

  686.             lutuv  = v->last_lutuv;

  687.             use_ic = v->last_use_ic;

  688.         }

  689.         if (!srcU)

  690.             return;

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

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

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

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

  695. 

  696.         if (fieldmv) {

  697.             if (!(uvsrc_y & 1))

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

  699.             else

  700.                 uvsrc_y -= (uvsrc_y < 2);

  701.         }

  702.         if (use_ic

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

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

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

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

  707.                                      s->uvlinesize, s->uvlinesize,

  708.                                      5, (5 << fieldmv), uvsrc_x, uvsrc_y,

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

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

  711.                                      s->uvlinesize, s->uvlinesize,

  712.                                      5, (5 << fieldmv), uvsrc_x, uvsrc_y,

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

  714.             srcU = s->edge_emu_buffer;

  715.             srcV = s->edge_emu_buffer + 16;

  716. 

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

  718.             if (use_ic) {

  719.                 vc1_lut_scale_chroma(srcU, srcV,

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

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

  722.                                      5, s->uvlinesize << fieldmv);

  723.             }

  724.         }

  725.         if (avg) {

  726.             if (!v->rnd) {

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

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

  729.             } else {

  730.                 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]);

  731.                 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]);

  732.             }

  733.         } else {

  734.             if (!v->rnd) {

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

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

  737.             } else {

  738.                 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]);

  739.                 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]);

  740.             }

  741.         }

  742.     }

  743. }

  744. 

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

  746.  */

  747. void ff_vc1_interp_mc(VC1Context *v)

  748. {

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

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

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

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

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

  754.     int use_ic = v->next_use_ic;

  755. 

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

  757.         return;

  758. 

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

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

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

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

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

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

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

  766.     }

  767.     if (v->fastuvmc) {

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

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

  770.     }

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

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

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

  774. 

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

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

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

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

  779. 

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

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

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

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

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

  785.     } else {

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

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

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

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

  790.     }

  791. 

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

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

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

  795. 

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

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

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

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

  800.     }

  801. 

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

  803.     if (CONFIG_GRAY && s->flags & CODEC_FLAG_GRAY) {

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

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

  806.     }

  807. 

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

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

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

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

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

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

  814. 

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

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

  817.                                  s->linesize, s->linesize,

  818.                                  k, k,

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

  820.                                  s->h_edge_pos, v_edge_pos);

  821.         srcY = s->edge_emu_buffer;

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

  823.                                  s->uvlinesize, s->uvlinesize,

  824.                                  8 + 1, 8 + 1,

  825.                                  uvsrc_x, uvsrc_y,

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

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

  828.                                  s->uvlinesize, s->uvlinesize,

  829.                                  8 + 1, 8 + 1,

  830.                                  uvsrc_x, uvsrc_y,

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

  832.         srcU = ubuf;

  833.         srcV = vbuf;

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

  835.         if (v->rangeredfrm) {

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

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

  838.         }

  839. 

  840.         if (use_ic) {

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

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

  843.             vc1_lut_scale_luma(srcY,

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

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

  846.                                k, s->linesize);

  847.             vc1_lut_scale_chroma(srcU, srcV,

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

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

  850.                                  9, s->uvlinesize);

  851.         }

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

  853.     }

  854. 

  855.     if (s->mspel) {

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

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

  858.     } else { // hpel mc

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

  860. 

  861.         if (!v->rnd)

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

  863.         else

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

  865.     }

  866. 

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

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

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

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

  871.     if (!v->rnd) {

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

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

  874.     } else {

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

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

  877.     }

  878. }