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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->avctx->flags & AV_CODEC_FLAG_GRAY) {

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

  275.         srcV = s->sc.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->sc.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->sc.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->sc.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->avctx->flags & AV_CODEC_FLAG_GRAY)

  336.         return;

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

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

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

  340.     if (!v->rnd) {

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

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

  343.     } else {

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

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

  346.     }

  347.     if (v->field_mode) {

  348.         v->mv_f[dir][s->block_index[4] + v->mb_off] = v->cur_field_type != v->ref_field_type[dir];

  349.         v->mv_f[dir][s->block_index[5] + v->mb_off] = v->cur_field_type != v->ref_field_type[dir];

  350.     }

  351. }

  352. 

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

  354.  */

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

  356. {

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

  358.     uint8_t *srcY;

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

  360.     int off;

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

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

  363.     uint8_t (*luty)[256];

  364.     int use_ic;

  365. 

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

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

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

  369.         return;

  370. 

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

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

  373. 

  374.     if (!dir) {

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

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

  377.             luty = v->curr_luty;

  378.             use_ic = *v->curr_use_ic;

  379.         } else {

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

  381.             luty = v->last_luty;

  382.             use_ic = v->last_use_ic;

  383.         }

  384.     } else {

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

  386.         luty = v->next_luty;

  387.         use_ic = v->next_use_ic;

  388.     }

  389. 

  390.     if (!srcY) {

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

  392.         return;

  393.     }

  394. 

  395.     if (v->field_mode) {

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

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

  398.     }

  399. 

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

  401.         int opp_count = get_luma_mv(v, 0,

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

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

  404.         int k, f = opp_count > 2;

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

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

  407.     }

  408. 

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

  410.         int qx, qy;

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

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

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

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

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

  416.         }

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

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

  419. 

  420.         if (qx < -17)

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

  422.         else if (qx > width)

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

  424.         if (qy < -18)

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

  426.         else if (qy > height + 1)

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

  428.     }

  429. 

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

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

  432.     else

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

  434. 

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

  436.     if (!fieldmv)

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

  438.     else

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

  440. 

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

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

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

  444.     } else {

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

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

  447.             if (src_y & 1)

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

  449.             else

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

  451.         } else {

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

  453.         }

  454.     }

  455. 

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

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

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

  459. 

  460.     if (fieldmv) {

  461.         if (!(src_y & 1))

  462.             v_edge_pos--;

  463.         else

  464.             src_y -= (src_y < 4);

  465.     }

  466.     if (v->rangeredfrm || use_ic

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

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

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

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

  471. 

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

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

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

  475.                                  s->linesize, s->linesize,

  476.                                  k, k << fieldmv,

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

  478.                                  s->h_edge_pos, v_edge_pos);

  479.         srcY = s->sc.edge_emu_buffer;

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

  481.         if (v->rangeredfrm) {

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

  483.         }

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

  485.         if (use_ic) {

  486.             vc1_lut_scale_luma(srcY,

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

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

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

  490.         }

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

  492.     }

  493. 

  494.     if (s->mspel) {

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

  496.         if (avg)

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

  498.         else

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

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

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

  502.         if (!v->rnd)

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

  504.         else

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

  506.     }

  507. }

  508. 

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

  510.  */

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

  512. {

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

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

  515.     uint8_t *srcU, *srcV;

  516.     int uvmx, uvmy, uvsrc_x, uvsrc_y;

  517.     int16_t tx, ty;

  518.     int chroma_ref_type;

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

  520.     uint8_t (*lutuv)[256];

  521.     int use_ic;

  522. 

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

  524.         return;

  525.     if (CONFIG_GRAY && s->avctx->flags & AV_CODEC_FLAG_GRAY)

  526.         return;

  527. 

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

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

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

  531.         if (!valid_count) {

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

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

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

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

  536.         }

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

  538.     } else {

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

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

  541.     }

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

  543.         return;

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

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

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

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

  548. 

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

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

  551. 

  552.     if (v->fastuvmc) {

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

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

  555.     }

  556.     // Field conversion bias

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

  558.         uvmy += 2 - 4 * chroma_ref_type;

  559. 

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

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

  562. 

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

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

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

  566.     } else {

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

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

  569.     }

  570. 

  571.     if (!dir) {

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

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

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

  575.             lutuv = v->curr_lutuv;

  576.             use_ic = *v->curr_use_ic;

  577.         } else {

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

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

  580.             lutuv = v->last_lutuv;

  581.             use_ic = v->last_use_ic;

  582.         }

  583.     } else {

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

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

  586.         lutuv = v->next_lutuv;

  587.         use_ic = v->next_use_ic;

  588.     }

  589. 

  590.     if (!srcU) {

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

  592.         return;

  593.     }

  594. 

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

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

  597. 

  598.     if (v->field_mode) {

  599.         if (chroma_ref_type) {

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

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

  602.         }

  603.     }

  604. 

  605.     if (v->rangeredfrm || use_ic

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

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

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

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

  610.                                  s->uvlinesize, s->uvlinesize,

  611.                                  8 + 1, 8 + 1, uvsrc_x, uvsrc_y,

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

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

  614.                                  s->uvlinesize, s->uvlinesize,

  615.                                  8 + 1, 8 + 1, uvsrc_x, uvsrc_y,

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

  617.         srcU = s->sc.edge_emu_buffer;

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

  619. 

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

  621.         if (v->rangeredfrm) {

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

  623.         }

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

  625.         if (use_ic) {

  626.             vc1_lut_scale_chroma(srcU, srcV,

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

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

  629.                                  9, s->uvlinesize);

  630.         }

  631.     }

  632. 

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

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

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

  636.     if (!v->rnd) {

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

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

  639.     } else {

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

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

  642.     }

  643.     if (v->field_mode) {

  644.         v->mv_f[dir][s->block_index[4] + v->mb_off] = v->cur_field_type != chroma_ref_type;

  645.         v->mv_f[dir][s->block_index[5] + v->mb_off] = v->cur_field_type != chroma_ref_type;

  646.     }

  647. }

  648. 

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

  650.  */

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

  652. {

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

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

  655.     uint8_t *srcU, *srcV;

  656.     int uvsrc_x, uvsrc_y;

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

  658.     int i, off, tx, ty;

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

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

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

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

  663.     int use_ic;

  664.     uint8_t (*lutuv)[256];

  665. 

  666.     if (CONFIG_GRAY && s->avctx->flags & AV_CODEC_FLAG_GRAY)

  667.         return;

  668. 

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

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

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

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

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

  674.         if (fieldmv)

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

  676.         else

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

  678.     }

  679. 

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

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

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

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

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

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

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

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

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

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

  690.             lutuv  = v->next_lutuv;

  691.             use_ic = v->next_use_ic;

  692.         } else {

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

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

  695.             lutuv  = v->last_lutuv;

  696.             use_ic = v->last_use_ic;

  697.         }

  698.         if (!srcU)

  699.             return;

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

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

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

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

  704. 

  705.         if (fieldmv) {

  706.             if (!(uvsrc_y & 1))

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

  708.             else

  709.                 uvsrc_y -= (uvsrc_y < 2);

  710.         }

  711.         if (use_ic

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

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

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

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

  716.                                      s->uvlinesize, s->uvlinesize,

  717.                                      5, (5 << fieldmv), uvsrc_x, uvsrc_y,

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

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

  720.                                      s->uvlinesize, s->uvlinesize,

  721.                                      5, (5 << fieldmv), uvsrc_x, uvsrc_y,

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

  723.             srcU = s->sc.edge_emu_buffer;

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

  725. 

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

  727.             if (use_ic) {

  728.                 vc1_lut_scale_chroma(srcU, srcV,

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

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

  731.                                      5, s->uvlinesize << fieldmv);

  732.             }

  733.         }

  734.         if (avg) {

  735.             if (!v->rnd) {

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

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

  738.             } else {

  739.                 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]);

  740.                 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]);

  741.             }

  742.         } else {

  743.             if (!v->rnd) {

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

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

  746.             } else {

  747.                 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]);

  748.                 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]);

  749.             }

  750.         }

  751.     }

  752. }

  753. 

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

  755.  */

  756. void ff_vc1_interp_mc(VC1Context *v)

  757. {

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

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

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

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

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

  763.     int use_ic = v->next_use_ic;

  764. 

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

  766.         return;

  767. 

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

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

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

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

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

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

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

  775.     }

  776.     if (v->fastuvmc) {

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

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

  779.     }

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

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

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

  783. 

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

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

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

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

  788. 

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

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

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

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

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

  794.     } else {

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

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

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

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

  799.     }

  800. 

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

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

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

  804. 

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

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

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

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

  809.     }

  810. 

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

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

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

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

  815.     }

  816. 

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

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

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

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

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

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

  823. 

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

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

  826.                                  s->linesize, s->linesize,

  827.                                  k, k,

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

  829.                                  s->h_edge_pos, v_edge_pos);

  830.         srcY = s->sc.edge_emu_buffer;

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

  832.                                  s->uvlinesize, s->uvlinesize,

  833.                                  8 + 1, 8 + 1,

  834.                                  uvsrc_x, uvsrc_y,

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

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

  837.                                  s->uvlinesize, s->uvlinesize,

  838.                                  8 + 1, 8 + 1,

  839.                                  uvsrc_x, uvsrc_y,

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

  841.         srcU = ubuf;

  842.         srcV = vbuf;

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

  844.         if (v->rangeredfrm) {

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

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

  847.         }

  848. 

  849.         if (use_ic) {

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

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

  852.             vc1_lut_scale_luma(srcY,

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

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

  855.                                k, s->linesize);

  856.             vc1_lut_scale_chroma(srcU, srcV,

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

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

  859.                                  9, s->uvlinesize);

  860.         }

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

  862.     }

  863. 

  864.     if (s->mspel) {

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

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

  867.     } else { // hpel mc

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

  869. 

  870.         if (!v->rnd)

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

  872.         else

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

  874.     }

  875. 

  876.     if (CONFIG_GRAY && s->avctx->flags & AV_CODEC_FLAG_GRAY)

  877.         return;

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

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

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

  881.     if (!v->rnd) {

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

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

  884.     } else {

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

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

  887.     }

  888. }