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FFmpeg/libavcodec/mpegvideo_motion.c

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  1. /*

  2.  * Copyright (c) 2000,2001 Fabrice Bellard

  3.  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>

  4.  *

  5.  * 4MV & hq & B-frame encoding stuff by Michael Niedermayer <michaelni@gmx.at>

  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. #include <string.h>

  25. 

  26. #include "libavutil/avassert.h"

  27. #include "libavutil/internal.h"

  28. #include "avcodec.h"

  29. #include "h261.h"

  30. #include "mpegutils.h"

  31. #include "mpegvideo.h"

  32. #include "mjpegenc.h"

  33. #include "msmpeg4.h"

  34. #include "qpeldsp.h"

  35. #include "wmv2.h"

  36. #include <limits.h>

  37. 

  38. static void gmc1_motion(MpegEncContext *s,

  39.                         uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr,

  40.                         uint8_t **ref_picture)

  41. {

  42.     uint8_t *ptr;

  43.     int src_x, src_y, motion_x, motion_y;

  44.     ptrdiff_t offset, linesize, uvlinesize;

  45.     int emu = 0;

  46. 

  47.     motion_x   = s->sprite_offset[0][0];

  48.     motion_y   = s->sprite_offset[0][1];

  49.     src_x      = s->mb_x * 16 + (motion_x >> (s->sprite_warping_accuracy + 1));

  50.     src_y      = s->mb_y * 16 + (motion_y >> (s->sprite_warping_accuracy + 1));

  51.     motion_x <<= (3 - s->sprite_warping_accuracy);

  52.     motion_y <<= (3 - s->sprite_warping_accuracy);

  53.     src_x      = av_clip(src_x, -16, s->width);

  54.     if (src_x == s->width)

  55.         motion_x = 0;

  56.     src_y = av_clip(src_y, -16, s->height);

  57.     if (src_y == s->height)

  58.         motion_y = 0;

  59. 

  60.     linesize   = s->linesize;

  61.     uvlinesize = s->uvlinesize;

  62. 

  63.     ptr = ref_picture[0] + src_y * linesize + src_x;

  64. 

  65.     if ((unsigned)src_x >= FFMAX(s->h_edge_pos - 17, 0) ||

  66.         (unsigned)src_y >= FFMAX(s->v_edge_pos - 17, 0)) {

  67.         s->vdsp.emulated_edge_mc(s->sc.edge_emu_buffer, ptr,

  68.                                  linesize, linesize,

  69.                                  17, 17,

  70.                                  src_x, src_y,

  71.                                  s->h_edge_pos, s->v_edge_pos);

  72.         ptr = s->sc.edge_emu_buffer;

  73.     }

  74. 

  75.     if ((motion_x | motion_y) & 7) {

  76.         s->mdsp.gmc1(dest_y, ptr, linesize, 16,

  77.                      motion_x & 15, motion_y & 15, 128 - s->no_rounding);

  78.         s->mdsp.gmc1(dest_y + 8, ptr + 8, linesize, 16,

  79.                      motion_x & 15, motion_y & 15, 128 - s->no_rounding);

  80.     } else {

  81.         int dxy;

  82. 

  83.         dxy = ((motion_x >> 3) & 1) | ((motion_y >> 2) & 2);

  84.         if (s->no_rounding) {

  85.             s->hdsp.put_no_rnd_pixels_tab[0][dxy](dest_y, ptr, linesize, 16);

  86.         } else {

  87.             s->hdsp.put_pixels_tab[0][dxy](dest_y, ptr, linesize, 16);

  88.         }

  89.     }

  90. 

  91.     if (CONFIG_GRAY && s->avctx->flags & CODEC_FLAG_GRAY)

  92.         return;

  93. 

  94.     motion_x   = s->sprite_offset[1][0];

  95.     motion_y   = s->sprite_offset[1][1];

  96.     src_x      = s->mb_x * 8 + (motion_x >> (s->sprite_warping_accuracy + 1));

  97.     src_y      = s->mb_y * 8 + (motion_y >> (s->sprite_warping_accuracy + 1));

  98.     motion_x <<= (3 - s->sprite_warping_accuracy);

  99.     motion_y <<= (3 - s->sprite_warping_accuracy);

  100.     src_x      = av_clip(src_x, -8, s->width >> 1);

  101.     if (src_x == s->width >> 1)

  102.         motion_x = 0;

  103.     src_y = av_clip(src_y, -8, s->height >> 1);

  104.     if (src_y == s->height >> 1)

  105.         motion_y = 0;

  106. 

  107.     offset = (src_y * uvlinesize) + src_x;

  108.     ptr    = ref_picture[1] + offset;

  109.     if ((unsigned)src_x >= FFMAX((s->h_edge_pos >> 1) - 9, 0) ||

  110.         (unsigned)src_y >= FFMAX((s->v_edge_pos >> 1) - 9, 0)) {

  111.         s->vdsp.emulated_edge_mc(s->sc.edge_emu_buffer, ptr,

  112.                                  uvlinesize, uvlinesize,

  113.                                  9, 9,

  114.                                  src_x, src_y,

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

  116.         ptr = s->sc.edge_emu_buffer;

  117.         emu = 1;

  118.     }

  119.     s->mdsp.gmc1(dest_cb, ptr, uvlinesize, 8,

  120.                  motion_x & 15, motion_y & 15, 128 - s->no_rounding);

  121. 

  122.     ptr = ref_picture[2] + offset;

  123.     if (emu) {

  124.         s->vdsp.emulated_edge_mc(s->sc.edge_emu_buffer, ptr,

  125.                                  uvlinesize, uvlinesize,

  126.                                  9, 9,

  127.                                  src_x, src_y,

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

  129.         ptr = s->sc.edge_emu_buffer;

  130.     }

  131.     s->mdsp.gmc1(dest_cr, ptr, uvlinesize, 8,

  132.                  motion_x & 15, motion_y & 15, 128 - s->no_rounding);

  133. }

  134. 

  135. static void gmc_motion(MpegEncContext *s,

  136.                        uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr,

  137.                        uint8_t **ref_picture)

  138. {

  139.     uint8_t *ptr;

  140.     int linesize, uvlinesize;

  141.     const int a = s->sprite_warping_accuracy;

  142.     int ox, oy;

  143. 

  144.     linesize   = s->linesize;

  145.     uvlinesize = s->uvlinesize;

  146. 

  147.     ptr = ref_picture[0];

  148. 

  149.     ox = s->sprite_offset[0][0] + s->sprite_delta[0][0] * s->mb_x * 16 +

  150.          s->sprite_delta[0][1] * s->mb_y * 16;

  151.     oy = s->sprite_offset[0][1] + s->sprite_delta[1][0] * s->mb_x * 16 +

  152.          s->sprite_delta[1][1] * s->mb_y * 16;

  153. 

  154.     s->mdsp.gmc(dest_y, ptr, linesize, 16,

  155.                 ox, oy,

  156.                 s->sprite_delta[0][0], s->sprite_delta[0][1],

  157.                 s->sprite_delta[1][0], s->sprite_delta[1][1],

  158.                 a + 1, (1 << (2 * a + 1)) - s->no_rounding,

  159.                 s->h_edge_pos, s->v_edge_pos);

  160.     s->mdsp.gmc(dest_y + 8, ptr, linesize, 16,

  161.                 ox + s->sprite_delta[0][0] * 8,

  162.                 oy + s->sprite_delta[1][0] * 8,

  163.                 s->sprite_delta[0][0], s->sprite_delta[0][1],

  164.                 s->sprite_delta[1][0], s->sprite_delta[1][1],

  165.                 a + 1, (1 << (2 * a + 1)) - s->no_rounding,

  166.                 s->h_edge_pos, s->v_edge_pos);

  167. 

  168.     if (CONFIG_GRAY && s->avctx->flags & CODEC_FLAG_GRAY)

  169.         return;

  170. 

  171.     ox = s->sprite_offset[1][0] + s->sprite_delta[0][0] * s->mb_x * 8 +

  172.          s->sprite_delta[0][1] * s->mb_y * 8;

  173.     oy = s->sprite_offset[1][1] + s->sprite_delta[1][0] * s->mb_x * 8 +

  174.          s->sprite_delta[1][1] * s->mb_y * 8;

  175. 

  176.     ptr = ref_picture[1];

  177.     s->mdsp.gmc(dest_cb, ptr, uvlinesize, 8,

  178.                 ox, oy,

  179.                 s->sprite_delta[0][0], s->sprite_delta[0][1],

  180.                 s->sprite_delta[1][0], s->sprite_delta[1][1],

  181.                 a + 1, (1 << (2 * a + 1)) - s->no_rounding,

  182.                 (s->h_edge_pos + 1) >> 1, (s->v_edge_pos + 1) >> 1);

  183. 

  184.     ptr = ref_picture[2];

  185.     s->mdsp.gmc(dest_cr, ptr, uvlinesize, 8,

  186.                 ox, oy,

  187.                 s->sprite_delta[0][0], s->sprite_delta[0][1],

  188.                 s->sprite_delta[1][0], s->sprite_delta[1][1],

  189.                 a + 1, (1 << (2 * a + 1)) - s->no_rounding,

  190.                 (s->h_edge_pos + 1) >> 1, (s->v_edge_pos + 1) >> 1);

  191. }

  192. 

  193. static inline int hpel_motion(MpegEncContext *s,

  194.                               uint8_t *dest, uint8_t *src,

  195.                               int src_x, int src_y,

  196.                               op_pixels_func *pix_op,

  197.                               int motion_x, int motion_y)

  198. {

  199.     int dxy = 0;

  200.     int emu = 0;

  201. 

  202.     src_x += motion_x >> 1;

  203.     src_y += motion_y >> 1;

  204. 

  205.     /* WARNING: do no forget half pels */

  206.     src_x = av_clip(src_x, -16, s->width); // FIXME unneeded for emu?

  207.     if (src_x != s->width)

  208.         dxy |= motion_x & 1;

  209.     src_y = av_clip(src_y, -16, s->height);

  210.     if (src_y != s->height)

  211.         dxy |= (motion_y & 1) << 1;

  212.     src += src_y * s->linesize + src_x;

  213. 

  214.         if ((unsigned)src_x >= FFMAX(s->h_edge_pos - (motion_x & 1) - 7, 0) ||

  215.             (unsigned)src_y >= FFMAX(s->v_edge_pos - (motion_y & 1) - 7, 0)) {

  216.             s->vdsp.emulated_edge_mc(s->sc.edge_emu_buffer, src,

  217.                                      s->linesize, s->linesize,

  218.                                      9, 9,

  219.                                      src_x, src_y,

  220.                                      s->h_edge_pos, s->v_edge_pos);

  221.             src = s->sc.edge_emu_buffer;

  222.             emu = 1;

  223.         }

  224.     pix_op[dxy](dest, src, s->linesize, 8);

  225.     return emu;

  226. }

  227. 

  228. static av_always_inline

  229. void mpeg_motion_internal(MpegEncContext *s,

  230.                           uint8_t *dest_y,

  231.                           uint8_t *dest_cb,

  232.                           uint8_t *dest_cr,

  233.                           int field_based,

  234.                           int bottom_field,

  235.                           int field_select,

  236.                           uint8_t **ref_picture,

  237.                           op_pixels_func (*pix_op)[4],

  238.                           int motion_x,

  239.                           int motion_y,

  240.                           int h,

  241.                           int is_mpeg12,

  242.                           int mb_y)

  243. {

  244.     uint8_t *ptr_y, *ptr_cb, *ptr_cr;

  245.     int dxy, uvdxy, mx, my, src_x, src_y,

  246.         uvsrc_x, uvsrc_y, v_edge_pos;

  247.     ptrdiff_t uvlinesize, linesize;

  248. 

  249. #if 0

  250.     if (s->quarter_sample) {

  251.         motion_x >>= 1;

  252.         motion_y >>= 1;

  253.     }

  254. #endif

  255. 

  256.     v_edge_pos = s->v_edge_pos >> field_based;

  257.     linesize   = s->current_picture.f->linesize[0] << field_based;

  258.     uvlinesize = s->current_picture.f->linesize[1] << field_based;

  259. 

  260.     dxy   = ((motion_y & 1) << 1) | (motion_x & 1);

  261.     src_x = s->mb_x * 16 + (motion_x >> 1);

  262.     src_y = (mb_y << (4 - field_based)) + (motion_y >> 1);

  263. 

  264.     if (!is_mpeg12 && s->out_format == FMT_H263) {

  265.         if ((s->workaround_bugs & FF_BUG_HPEL_CHROMA) && field_based) {

  266.             mx      = (motion_x >> 1) | (motion_x & 1);

  267.             my      = motion_y >> 1;

  268.             uvdxy   = ((my & 1) << 1) | (mx & 1);

  269.             uvsrc_x = s->mb_x * 8 + (mx >> 1);

  270.             uvsrc_y = (mb_y << (3 - field_based)) + (my >> 1);

  271.         } else {

  272.             uvdxy   = dxy | (motion_y & 2) | ((motion_x & 2) >> 1);

  273.             uvsrc_x = src_x >> 1;

  274.             uvsrc_y = src_y >> 1;

  275.         }

  276.     // Even chroma mv's are full pel in H261

  277.     } else if (!is_mpeg12 && s->out_format == FMT_H261) {

  278.         mx      = motion_x / 4;

  279.         my      = motion_y / 4;

  280.         uvdxy   = 0;

  281.         uvsrc_x = s->mb_x * 8 + mx;

  282.         uvsrc_y = mb_y * 8 + my;

  283.     } else {

  284.         if (s->chroma_y_shift) {

  285.             mx      = motion_x / 2;

  286.             my      = motion_y / 2;

  287.             uvdxy   = ((my & 1) << 1) | (mx & 1);

  288.             uvsrc_x = s->mb_x * 8 + (mx >> 1);

  289.             uvsrc_y = (mb_y << (3 - field_based)) + (my >> 1);

  290.         } else {

  291.             if (s->chroma_x_shift) {

  292.                 // Chroma422

  293.                 mx      = motion_x / 2;

  294.                 uvdxy   = ((motion_y & 1) << 1) | (mx & 1);

  295.                 uvsrc_x = s->mb_x * 8 + (mx >> 1);

  296.                 uvsrc_y = src_y;

  297.             } else {

  298.                 // Chroma444

  299.                 uvdxy   = dxy;

  300.                 uvsrc_x = src_x;

  301.                 uvsrc_y = src_y;

  302.             }

  303.         }

  304.     }

  305. 

  306.     ptr_y  = ref_picture[0] + src_y * linesize + src_x;

  307.     ptr_cb = ref_picture[1] + uvsrc_y * uvlinesize + uvsrc_x;

  308.     ptr_cr = ref_picture[2] + uvsrc_y * uvlinesize + uvsrc_x;

  309. 

  310.     if ((unsigned)src_x >= FFMAX(s->h_edge_pos - (motion_x & 1) - 15   , 0) ||

  311.         (unsigned)src_y >= FFMAX(   v_edge_pos - (motion_y & 1) - h + 1, 0)) {

  312.         if (is_mpeg12 ||

  313.             s->codec_id == AV_CODEC_ID_MPEG2VIDEO ||

  314.             s->codec_id == AV_CODEC_ID_MPEG1VIDEO) {

  315.             av_log(s->avctx, AV_LOG_DEBUG,

  316.                    "MPEG motion vector out of boundary (%d %d)\n", src_x,

  317.                    src_y);

  318.             return;

  319.         }

  320.         src_y = (unsigned)src_y << field_based;

  321.         s->vdsp.emulated_edge_mc(s->sc.edge_emu_buffer, ptr_y,

  322.                                  s->linesize, s->linesize,

  323.                                  17, 17 + field_based,

  324.                                  src_x, src_y,

  325.                                  s->h_edge_pos, s->v_edge_pos);

  326.         ptr_y = s->sc.edge_emu_buffer;

  327.         if (!CONFIG_GRAY || !(s->avctx->flags & CODEC_FLAG_GRAY)) {

  328.             uint8_t *ubuf = s->sc.edge_emu_buffer + 18 * s->linesize;

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

  330.             uvsrc_y = (unsigned)uvsrc_y << field_based;

  331.             s->vdsp.emulated_edge_mc(ubuf, ptr_cb,

  332.                                      s->uvlinesize, s->uvlinesize,

  333.                                      9, 9 + field_based,

  334.                                      uvsrc_x, uvsrc_y,

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

  336.             s->vdsp.emulated_edge_mc(vbuf, ptr_cr,

  337.                                      s->uvlinesize, s->uvlinesize,

  338.                                      9, 9 + field_based,

  339.                                      uvsrc_x, uvsrc_y,

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

  341.             ptr_cb = ubuf;

  342.             ptr_cr = vbuf;

  343.         }

  344.     }

  345. 

  346.     /* FIXME use this for field pix too instead of the obnoxious hack which

  347.      * changes picture.data */

  348.     if (bottom_field) {

  349.         dest_y  += s->linesize;

  350.         dest_cb += s->uvlinesize;

  351.         dest_cr += s->uvlinesize;

  352.     }

  353. 

  354.     if (field_select) {

  355.         ptr_y  += s->linesize;

  356.         ptr_cb += s->uvlinesize;

  357.         ptr_cr += s->uvlinesize;

  358.     }

  359. 

  360.     pix_op[0][dxy](dest_y, ptr_y, linesize, h);

  361. 

  362.     if (!CONFIG_GRAY || !(s->avctx->flags & CODEC_FLAG_GRAY)) {

  363.         pix_op[s->chroma_x_shift][uvdxy]

  364.             (dest_cb, ptr_cb, uvlinesize, h >> s->chroma_y_shift);

  365.         pix_op[s->chroma_x_shift][uvdxy]

  366.             (dest_cr, ptr_cr, uvlinesize, h >> s->chroma_y_shift);

  367.     }

  368.     if (!is_mpeg12 && (CONFIG_H261_ENCODER || CONFIG_H261_DECODER) &&

  369.         s->out_format == FMT_H261) {

  370.         ff_h261_loop_filter(s);

  371.     }

  372. }

  373. /* apply one mpeg motion vector to the three components */

  374. static void mpeg_motion(MpegEncContext *s,

  375.                         uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr,

  376.                         int field_select, uint8_t **ref_picture,

  377.                         op_pixels_func (*pix_op)[4],

  378.                         int motion_x, int motion_y, int h, int mb_y)

  379. {

  380. #if !CONFIG_SMALL

  381.     if (s->out_format == FMT_MPEG1)

  382.         mpeg_motion_internal(s, dest_y, dest_cb, dest_cr, 0, 0,

  383.                              field_select, ref_picture, pix_op,

  384.                              motion_x, motion_y, h, 1, mb_y);

  385.     else

  386. #endif

  387.         mpeg_motion_internal(s, dest_y, dest_cb, dest_cr, 0, 0,

  388.                              field_select, ref_picture, pix_op,

  389.                              motion_x, motion_y, h, 0, mb_y);

  390. }

  391. 

  392. static void mpeg_motion_field(MpegEncContext *s, uint8_t *dest_y,

  393.                               uint8_t *dest_cb, uint8_t *dest_cr,

  394.                               int bottom_field, int field_select,

  395.                               uint8_t **ref_picture,

  396.                               op_pixels_func (*pix_op)[4],

  397.                               int motion_x, int motion_y, int h, int mb_y)

  398. {

  399. #if !CONFIG_SMALL

  400.     if (s->out_format == FMT_MPEG1)

  401.         mpeg_motion_internal(s, dest_y, dest_cb, dest_cr, 1,

  402.                              bottom_field, field_select, ref_picture, pix_op,

  403.                              motion_x, motion_y, h, 1, mb_y);

  404.     else

  405. #endif

  406.         mpeg_motion_internal(s, dest_y, dest_cb, dest_cr, 1,

  407.                              bottom_field, field_select, ref_picture, pix_op,

  408.                              motion_x, motion_y, h, 0, mb_y);

  409. }

  410. 

  411. // FIXME: SIMDify, avg variant, 16x16 version

  412. static inline void put_obmc(uint8_t *dst, uint8_t *src[5], int stride)

  413. {

  414.     int x;

  415.     uint8_t *const top    = src[1];

  416.     uint8_t *const left   = src[2];

  417.     uint8_t *const mid    = src[0];

  418.     uint8_t *const right  = src[3];

  419.     uint8_t *const bottom = src[4];

  420. #define OBMC_FILTER(x, t, l, m, r, b)\

  421.     dst[x]= (t*top[x] + l*left[x] + m*mid[x] + r*right[x] + b*bottom[x] + 4)>>3

  422. #define OBMC_FILTER4(x, t, l, m, r, b)\

  423.     OBMC_FILTER(x         , t, l, m, r, b);\

  424.     OBMC_FILTER(x+1       , t, l, m, r, b);\

  425.     OBMC_FILTER(x  +stride, t, l, m, r, b);\

  426.     OBMC_FILTER(x+1+stride, t, l, m, r, b);

  427. 

  428.     x = 0;

  429.     OBMC_FILTER (x    , 2, 2, 4, 0, 0);

  430.     OBMC_FILTER (x + 1, 2, 1, 5, 0, 0);

  431.     OBMC_FILTER4(x + 2, 2, 1, 5, 0, 0);

  432.     OBMC_FILTER4(x + 4, 2, 0, 5, 1, 0);

  433.     OBMC_FILTER (x + 6, 2, 0, 5, 1, 0);

  434.     OBMC_FILTER (x + 7, 2, 0, 4, 2, 0);

  435.     x += stride;

  436.     OBMC_FILTER (x    , 1, 2, 5, 0, 0);

  437.     OBMC_FILTER (x + 1, 1, 2, 5, 0, 0);

  438.     OBMC_FILTER (x + 6, 1, 0, 5, 2, 0);

  439.     OBMC_FILTER (x + 7, 1, 0, 5, 2, 0);

  440.     x += stride;

  441.     OBMC_FILTER4(x    , 1, 2, 5, 0, 0);

  442.     OBMC_FILTER4(x + 2, 1, 1, 6, 0, 0);

  443.     OBMC_FILTER4(x + 4, 1, 0, 6, 1, 0);

  444.     OBMC_FILTER4(x + 6, 1, 0, 5, 2, 0);

  445.     x += 2 * stride;

  446.     OBMC_FILTER4(x    , 0, 2, 5, 0, 1);

  447.     OBMC_FILTER4(x + 2, 0, 1, 6, 0, 1);

  448.     OBMC_FILTER4(x + 4, 0, 0, 6, 1, 1);

  449.     OBMC_FILTER4(x + 6, 0, 0, 5, 2, 1);

  450.     x += 2*stride;

  451.     OBMC_FILTER (x    , 0, 2, 5, 0, 1);

  452.     OBMC_FILTER (x + 1, 0, 2, 5, 0, 1);

  453.     OBMC_FILTER4(x + 2, 0, 1, 5, 0, 2);

  454.     OBMC_FILTER4(x + 4, 0, 0, 5, 1, 2);

  455.     OBMC_FILTER (x + 6, 0, 0, 5, 2, 1);

  456.     OBMC_FILTER (x + 7, 0, 0, 5, 2, 1);

  457.     x += stride;

  458.     OBMC_FILTER (x    , 0, 2, 4, 0, 2);

  459.     OBMC_FILTER (x + 1, 0, 1, 5, 0, 2);

  460.     OBMC_FILTER (x + 6, 0, 0, 5, 1, 2);

  461.     OBMC_FILTER (x + 7, 0, 0, 4, 2, 2);

  462. }

  463. 

  464. /* obmc for 1 8x8 luma block */

  465. static inline void obmc_motion(MpegEncContext *s,

  466.                                uint8_t *dest, uint8_t *src,

  467.                                int src_x, int src_y,

  468.                                op_pixels_func *pix_op,

  469.                                int16_t mv[5][2] /* mid top left right bottom */)

  470. #define MID    0

  471. {

  472.     int i;

  473.     uint8_t *ptr[5];

  474. 

  475.     av_assert2(s->quarter_sample == 0);

  476. 

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

  478.         if (i && mv[i][0] == mv[MID][0] && mv[i][1] == mv[MID][1]) {

  479.             ptr[i] = ptr[MID];

  480.         } else {

  481.             ptr[i] = s->sc.obmc_scratchpad + 8 * (i & 1) +

  482.                      s->linesize * 8 * (i >> 1);

  483.             hpel_motion(s, ptr[i], src, src_x, src_y, pix_op,

  484.                         mv[i][0], mv[i][1]);

  485.         }

  486.     }

  487. 

  488.     put_obmc(dest, ptr, s->linesize);

  489. }

  490. 

  491. static inline void qpel_motion(MpegEncContext *s,

  492.                                uint8_t *dest_y,

  493.                                uint8_t *dest_cb,

  494.                                uint8_t *dest_cr,

  495.                                int field_based, int bottom_field,

  496.                                int field_select, uint8_t **ref_picture,

  497.                                op_pixels_func (*pix_op)[4],

  498.                                qpel_mc_func (*qpix_op)[16],

  499.                                int motion_x, int motion_y, int h)

  500. {

  501.     uint8_t *ptr_y, *ptr_cb, *ptr_cr;

  502.     int dxy, uvdxy, mx, my, src_x, src_y, uvsrc_x, uvsrc_y, v_edge_pos;

  503.     ptrdiff_t linesize, uvlinesize;

  504. 

  505.     dxy   = ((motion_y & 3) << 2) | (motion_x & 3);

  506. 

  507.     src_x = s->mb_x *  16                 + (motion_x >> 2);

  508.     src_y = s->mb_y * (16 >> field_based) + (motion_y >> 2);

  509. 

  510.     v_edge_pos = s->v_edge_pos >> field_based;

  511.     linesize   = s->linesize   << field_based;

  512.     uvlinesize = s->uvlinesize << field_based;

  513. 

  514.     if (field_based) {

  515.         mx = motion_x / 2;

  516.         my = motion_y >> 1;

  517.     } else if (s->workaround_bugs & FF_BUG_QPEL_CHROMA2) {

  518.         static const int rtab[8] = { 0, 0, 1, 1, 0, 0, 0, 1 };

  519.         mx = (motion_x >> 1) + rtab[motion_x & 7];

  520.         my = (motion_y >> 1) + rtab[motion_y & 7];

  521.     } else if (s->workaround_bugs & FF_BUG_QPEL_CHROMA) {

  522.         mx = (motion_x >> 1) | (motion_x & 1);

  523.         my = (motion_y >> 1) | (motion_y & 1);

  524.     } else {

  525.         mx = motion_x / 2;

  526.         my = motion_y / 2;

  527.     }

  528.     mx = (mx >> 1) | (mx & 1);

  529.     my = (my >> 1) | (my & 1);

  530. 

  531.     uvdxy = (mx & 1) | ((my & 1) << 1);

  532.     mx  >>= 1;

  533.     my  >>= 1;

  534. 

  535.     uvsrc_x = s->mb_x *  8                 + mx;

  536.     uvsrc_y = s->mb_y * (8 >> field_based) + my;

  537. 

  538.     ptr_y  = ref_picture[0] + src_y   * linesize   + src_x;

  539.     ptr_cb = ref_picture[1] + uvsrc_y * uvlinesize + uvsrc_x;

  540.     ptr_cr = ref_picture[2] + uvsrc_y * uvlinesize + uvsrc_x;

  541. 

  542.     if ((unsigned)src_x >= FFMAX(s->h_edge_pos - (motion_x & 3) - 15   , 0) ||

  543.         (unsigned)src_y >= FFMAX(   v_edge_pos - (motion_y & 3) - h + 1, 0)) {

  544.         s->vdsp.emulated_edge_mc(s->sc.edge_emu_buffer, ptr_y,

  545.                                  s->linesize, s->linesize,

  546.                                  17, 17 + field_based,

  547.                                  src_x, src_y << field_based,

  548.                                  s->h_edge_pos, s->v_edge_pos);

  549.         ptr_y = s->sc.edge_emu_buffer;

  550.         if (!CONFIG_GRAY || !(s->avctx->flags & CODEC_FLAG_GRAY)) {

  551.             uint8_t *ubuf = s->sc.edge_emu_buffer + 18 * s->linesize;

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

  553.             s->vdsp.emulated_edge_mc(ubuf, ptr_cb,

  554.                                      s->uvlinesize, s->uvlinesize,

  555.                                      9, 9 + field_based,

  556.                                      uvsrc_x, uvsrc_y << field_based,

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

  558.             s->vdsp.emulated_edge_mc(vbuf, ptr_cr,

  559.                                      s->uvlinesize, s->uvlinesize,

  560.                                      9, 9 + field_based,

  561.                                      uvsrc_x, uvsrc_y << field_based,

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

  563.             ptr_cb = ubuf;

  564.             ptr_cr = vbuf;

  565.         }

  566.     }

  567. 

  568.     if (!field_based)

  569.         qpix_op[0][dxy](dest_y, ptr_y, linesize);

  570.     else {

  571.         if (bottom_field) {

  572.             dest_y  += s->linesize;

  573.             dest_cb += s->uvlinesize;

  574.             dest_cr += s->uvlinesize;

  575.         }

  576. 

  577.         if (field_select) {

  578.             ptr_y  += s->linesize;

  579.             ptr_cb += s->uvlinesize;

  580.             ptr_cr += s->uvlinesize;

  581.         }

  582.         // damn interlaced mode

  583.         // FIXME boundary mirroring is not exactly correct here

  584.         qpix_op[1][dxy](dest_y, ptr_y, linesize);

  585.         qpix_op[1][dxy](dest_y + 8, ptr_y + 8, linesize);

  586.     }

  587.     if (!CONFIG_GRAY || !(s->avctx->flags & CODEC_FLAG_GRAY)) {

  588.         pix_op[1][uvdxy](dest_cr, ptr_cr, uvlinesize, h >> 1);

  589.         pix_op[1][uvdxy](dest_cb, ptr_cb, uvlinesize, h >> 1);

  590.     }

  591. }

  592. 

  593. /**

  594.  * h263 chroma 4mv motion compensation.

  595.  */

  596. static void chroma_4mv_motion(MpegEncContext *s,

  597.                               uint8_t *dest_cb, uint8_t *dest_cr,

  598.                               uint8_t **ref_picture,

  599.                               op_pixels_func *pix_op,

  600.                               int mx, int my)

  601. {

  602.     uint8_t *ptr;

  603.     int src_x, src_y, dxy, emu = 0;

  604.     ptrdiff_t offset;

  605. 

  606.     /* In case of 8X8, we construct a single chroma motion vector

  607.      * with a special rounding */

  608.     mx = ff_h263_round_chroma(mx);

  609.     my = ff_h263_round_chroma(my);

  610. 

  611.     dxy  = ((my & 1) << 1) | (mx & 1);

  612.     mx >>= 1;

  613.     my >>= 1;

  614. 

  615.     src_x = s->mb_x * 8 + mx;

  616.     src_y = s->mb_y * 8 + my;

  617.     src_x = av_clip(src_x, -8, (s->width >> 1));

  618.     if (src_x == (s->width >> 1))

  619.         dxy &= ~1;

  620.     src_y = av_clip(src_y, -8, (s->height >> 1));

  621.     if (src_y == (s->height >> 1))

  622.         dxy &= ~2;

  623. 

  624.     offset = src_y * s->uvlinesize + src_x;

  625.     ptr    = ref_picture[1] + offset;

  626.     if ((unsigned)src_x >= FFMAX((s->h_edge_pos >> 1) - (dxy  & 1) - 7, 0) ||

  627.         (unsigned)src_y >= FFMAX((s->v_edge_pos >> 1) - (dxy >> 1) - 7, 0)) {

  628.         s->vdsp.emulated_edge_mc(s->sc.edge_emu_buffer, ptr,

  629.                                  s->uvlinesize, s->uvlinesize,

  630.                                  9, 9, src_x, src_y,

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

  632.         ptr = s->sc.edge_emu_buffer;

  633.         emu = 1;

  634.     }

  635.     pix_op[dxy](dest_cb, ptr, s->uvlinesize, 8);

  636. 

  637.     ptr = ref_picture[2] + offset;

  638.     if (emu) {

  639.         s->vdsp.emulated_edge_mc(s->sc.edge_emu_buffer, ptr,

  640.                                  s->uvlinesize, s->uvlinesize,

  641.                                  9, 9, src_x, src_y,

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

  643.         ptr = s->sc.edge_emu_buffer;

  644.     }

  645.     pix_op[dxy](dest_cr, ptr, s->uvlinesize, 8);

  646. }

  647. 

  648. static inline void prefetch_motion(MpegEncContext *s, uint8_t **pix, int dir)

  649. {

  650.     /* fetch pixels for estimated mv 4 macroblocks ahead

  651.      * optimized for 64byte cache lines */

  652.     const int shift = s->quarter_sample ? 2 : 1;

  653.     const int mx    = (s->mv[dir][0][0] >> shift) + 16 * s->mb_x + 8;

  654.     const int my    = (s->mv[dir][0][1] >> shift) + 16 * s->mb_y;

  655.     int off         = mx + (my + (s->mb_x & 3) * 4) * s->linesize + 64;

  656. 

  657.     s->vdsp.prefetch(pix[0] + off, s->linesize, 4);

  658.     off = (mx >> 1) + ((my >> 1) + (s->mb_x & 7)) * s->uvlinesize + 64;

  659.     s->vdsp.prefetch(pix[1] + off, pix[2] - pix[1], 2);

  660. }

  661. 

  662. static inline void apply_obmc(MpegEncContext *s,

  663.                               uint8_t *dest_y,

  664.                               uint8_t *dest_cb,

  665.                               uint8_t *dest_cr,

  666.                               uint8_t **ref_picture,

  667.                               op_pixels_func (*pix_op)[4])

  668. {

  669.     LOCAL_ALIGNED_8(int16_t, mv_cache, [4], [4][2]);

  670.     Picture *cur_frame   = &s->current_picture;

  671.     int mb_x = s->mb_x;

  672.     int mb_y = s->mb_y;

  673.     const int xy         = mb_x + mb_y * s->mb_stride;

  674.     const int mot_stride = s->b8_stride;

  675.     const int mot_xy     = mb_x * 2 + mb_y * 2 * mot_stride;

  676.     int mx, my, i;

  677. 

  678.     av_assert2(!s->mb_skipped);

  679. 

  680.     AV_COPY32(mv_cache[1][1], cur_frame->motion_val[0][mot_xy]);

  681.     AV_COPY32(mv_cache[1][2], cur_frame->motion_val[0][mot_xy + 1]);

  682. 

  683.     AV_COPY32(mv_cache[2][1],

  684.               cur_frame->motion_val[0][mot_xy + mot_stride]);

  685.     AV_COPY32(mv_cache[2][2],

  686.               cur_frame->motion_val[0][mot_xy + mot_stride + 1]);

  687. 

  688.     AV_COPY32(mv_cache[3][1],

  689.               cur_frame->motion_val[0][mot_xy + mot_stride]);

  690.     AV_COPY32(mv_cache[3][2],

  691.               cur_frame->motion_val[0][mot_xy + mot_stride + 1]);

  692. 

  693.     if (mb_y == 0 || IS_INTRA(cur_frame->mb_type[xy - s->mb_stride])) {

  694.         AV_COPY32(mv_cache[0][1], mv_cache[1][1]);

  695.         AV_COPY32(mv_cache[0][2], mv_cache[1][2]);

  696.     } else {

  697.         AV_COPY32(mv_cache[0][1],

  698.                   cur_frame->motion_val[0][mot_xy - mot_stride]);

  699.         AV_COPY32(mv_cache[0][2],

  700.                   cur_frame->motion_val[0][mot_xy - mot_stride + 1]);

  701.     }

  702. 

  703.     if (mb_x == 0 || IS_INTRA(cur_frame->mb_type[xy - 1])) {

  704.         AV_COPY32(mv_cache[1][0], mv_cache[1][1]);

  705.         AV_COPY32(mv_cache[2][0], mv_cache[2][1]);

  706.     } else {

  707.         AV_COPY32(mv_cache[1][0], cur_frame->motion_val[0][mot_xy - 1]);

  708.         AV_COPY32(mv_cache[2][0],

  709.                   cur_frame->motion_val[0][mot_xy - 1 + mot_stride]);

  710.     }

  711. 

  712.     if (mb_x + 1 >= s->mb_width || IS_INTRA(cur_frame->mb_type[xy + 1])) {

  713.         AV_COPY32(mv_cache[1][3], mv_cache[1][2]);

  714.         AV_COPY32(mv_cache[2][3], mv_cache[2][2]);

  715.     } else {

  716.         AV_COPY32(mv_cache[1][3], cur_frame->motion_val[0][mot_xy + 2]);

  717.         AV_COPY32(mv_cache[2][3],

  718.                   cur_frame->motion_val[0][mot_xy + 2 + mot_stride]);

  719.     }

  720. 

  721.     mx = 0;

  722.     my = 0;

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

  724.         const int x      = (i & 1) + 1;

  725.         const int y      = (i >> 1) + 1;

  726.         int16_t mv[5][2] = {

  727.             { mv_cache[y][x][0],     mv_cache[y][x][1]         },

  728.             { mv_cache[y - 1][x][0], mv_cache[y - 1][x][1]     },

  729.             { mv_cache[y][x - 1][0], mv_cache[y][x - 1][1]     },

  730.             { mv_cache[y][x + 1][0], mv_cache[y][x + 1][1]     },

  731.             { mv_cache[y + 1][x][0], mv_cache[y + 1][x][1]     }

  732.         };

  733.         // FIXME cleanup

  734.         obmc_motion(s, dest_y + ((i & 1) * 8) + (i >> 1) * 8 * s->linesize,

  735.                     ref_picture[0],

  736.                     mb_x * 16 + (i & 1) * 8, mb_y * 16 + (i >> 1) * 8,

  737.                     pix_op[1],

  738.                     mv);

  739. 

  740.         mx += mv[0][0];

  741.         my += mv[0][1];

  742.     }

  743.     if (!CONFIG_GRAY || !(s->avctx->flags & CODEC_FLAG_GRAY))

  744.         chroma_4mv_motion(s, dest_cb, dest_cr,

  745.                           ref_picture, pix_op[1],

  746.                           mx, my);

  747. }

  748. 

  749. static inline void apply_8x8(MpegEncContext *s,

  750.                              uint8_t *dest_y,

  751.                              uint8_t *dest_cb,

  752.                              uint8_t *dest_cr,

  753.                              int dir,

  754.                              uint8_t **ref_picture,

  755.                              qpel_mc_func (*qpix_op)[16],

  756.                              op_pixels_func (*pix_op)[4])

  757. {

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

  759.     int i;

  760.     int mb_x = s->mb_x;

  761.     int mb_y = s->mb_y;

  762.     uint8_t *ptr, *dest;

  763. 

  764.     mx = 0;

  765.     my = 0;

  766.     if (s->quarter_sample) {

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

  768.             int motion_x = s->mv[dir][i][0];

  769.             int motion_y = s->mv[dir][i][1];

  770. 

  771.             dxy   = ((motion_y & 3) << 2) | (motion_x & 3);

  772.             src_x = mb_x * 16 + (motion_x >> 2) + (i & 1) * 8;

  773.             src_y = mb_y * 16 + (motion_y >> 2) + (i >> 1) * 8;

  774. 

  775.             /* WARNING: do no forget half pels */

  776.             src_x = av_clip(src_x, -16, s->width);

  777.             if (src_x == s->width)

  778.                 dxy &= ~3;

  779.             src_y = av_clip(src_y, -16, s->height);

  780.             if (src_y == s->height)

  781.                 dxy &= ~12;

  782. 

  783.             ptr = ref_picture[0] + (src_y * s->linesize) + (src_x);

  784.             if ((unsigned)src_x >= FFMAX(s->h_edge_pos - (motion_x & 3) - 7, 0) ||

  785.                 (unsigned)src_y >= FFMAX(s->v_edge_pos - (motion_y & 3) - 7, 0)) {

  786.                 s->vdsp.emulated_edge_mc(s->sc.edge_emu_buffer, ptr,

  787.                                          s->linesize, s->linesize,

  788.                                          9, 9,

  789.                                          src_x, src_y,

  790.                                          s->h_edge_pos,

  791.                                          s->v_edge_pos);

  792.                 ptr = s->sc.edge_emu_buffer;

  793.             }

  794.             dest = dest_y + ((i & 1) * 8) + (i >> 1) * 8 * s->linesize;

  795.             qpix_op[1][dxy](dest, ptr, s->linesize);

  796. 

  797.             mx += s->mv[dir][i][0] / 2;

  798.             my += s->mv[dir][i][1] / 2;

  799.         }

  800.     } else {

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

  802.             hpel_motion(s,

  803.                         dest_y + ((i & 1) * 8) + (i >> 1) * 8 * s->linesize,

  804.                         ref_picture[0],

  805.                         mb_x * 16 + (i & 1) * 8,

  806.                         mb_y * 16 + (i >> 1) * 8,

  807.                         pix_op[1],

  808.                         s->mv[dir][i][0],

  809.                         s->mv[dir][i][1]);

  810. 

  811.             mx += s->mv[dir][i][0];

  812.             my += s->mv[dir][i][1];

  813.         }

  814.     }

  815. 

  816.     if (!CONFIG_GRAY || !(s->avctx->flags & CODEC_FLAG_GRAY))

  817.         chroma_4mv_motion(s, dest_cb, dest_cr,

  818.                           ref_picture, pix_op[1], mx, my);

  819. }

  820. 

  821. /**

  822.  * motion compensation of a single macroblock

  823.  * @param s context

  824.  * @param dest_y luma destination pointer

  825.  * @param dest_cb chroma cb/u destination pointer

  826.  * @param dest_cr chroma cr/v destination pointer

  827.  * @param dir direction (0->forward, 1->backward)

  828.  * @param ref_picture array[3] of pointers to the 3 planes of the reference picture

  829.  * @param pix_op halfpel motion compensation function (average or put normally)

  830.  * @param qpix_op qpel motion compensation function (average or put normally)

  831.  * the motion vectors are taken from s->mv and the MV type from s->mv_type

  832.  */

  833. static av_always_inline void mpv_motion_internal(MpegEncContext *s,

  834.                                                  uint8_t *dest_y,

  835.                                                  uint8_t *dest_cb,

  836.                                                  uint8_t *dest_cr,

  837.                                                  int dir,

  838.                                                  uint8_t **ref_picture,

  839.                                                  op_pixels_func (*pix_op)[4],

  840.                                                  qpel_mc_func (*qpix_op)[16],

  841.                                                  int is_mpeg12)

  842. {

  843.     int i;

  844.     int mb_y = s->mb_y;

  845. 

  846.     prefetch_motion(s, ref_picture, dir);

  847. 

  848.     if (!is_mpeg12 && s->obmc && s->pict_type != AV_PICTURE_TYPE_B) {

  849.         apply_obmc(s, dest_y, dest_cb, dest_cr, ref_picture, pix_op);

  850.         return;

  851.     }

  852. 

  853.     switch (s->mv_type) {

  854.     case MV_TYPE_16X16:

  855.         if (s->mcsel) {

  856.             if (s->real_sprite_warping_points == 1) {

  857.                 gmc1_motion(s, dest_y, dest_cb, dest_cr,

  858.                             ref_picture);

  859.             } else {

  860.                 gmc_motion(s, dest_y, dest_cb, dest_cr,

  861.                            ref_picture);

  862.             }

  863.         } else if (!is_mpeg12 && s->quarter_sample) {

  864.             qpel_motion(s, dest_y, dest_cb, dest_cr,

  865.                         0, 0, 0,

  866.                         ref_picture, pix_op, qpix_op,

  867.                         s->mv[dir][0][0], s->mv[dir][0][1], 16);

  868.         } else if (!is_mpeg12 && (CONFIG_WMV2_DECODER || CONFIG_WMV2_ENCODER) &&

  869.                    s->mspel && s->codec_id == AV_CODEC_ID_WMV2) {

  870.             ff_mspel_motion(s, dest_y, dest_cb, dest_cr,

  871.                             ref_picture, pix_op,

  872.                             s->mv[dir][0][0], s->mv[dir][0][1], 16);

  873.         } else {

  874.             mpeg_motion(s, dest_y, dest_cb, dest_cr, 0,

  875.                         ref_picture, pix_op,

  876.                         s->mv[dir][0][0], s->mv[dir][0][1], 16, mb_y);

  877.         }

  878.         break;

  879.     case MV_TYPE_8X8:

  880.         if (!is_mpeg12)

  881.             apply_8x8(s, dest_y, dest_cb, dest_cr,

  882.                       dir, ref_picture, qpix_op, pix_op);

  883.         break;

  884.     case MV_TYPE_FIELD:

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

  886.             if (!is_mpeg12 && s->quarter_sample) {

  887.                 for (i = 0; i < 2; i++)

  888.                     qpel_motion(s, dest_y, dest_cb, dest_cr,

  889.                                 1, i, s->field_select[dir][i],

  890.                                 ref_picture, pix_op, qpix_op,

  891.                                 s->mv[dir][i][0], s->mv[dir][i][1], 8);

  892.             } else {

  893.                 /* top field */

  894.                 mpeg_motion_field(s, dest_y, dest_cb, dest_cr,

  895.                                   0, s->field_select[dir][0],

  896.                                   ref_picture, pix_op,

  897.                                   s->mv[dir][0][0], s->mv[dir][0][1], 8, mb_y);

  898.                 /* bottom field */

  899.                 mpeg_motion_field(s, dest_y, dest_cb, dest_cr,

  900.                                   1, s->field_select[dir][1],

  901.                                   ref_picture, pix_op,

  902.                                   s->mv[dir][1][0], s->mv[dir][1][1], 8, mb_y);

  903.             }

  904.         } else {

  905.             if (   s->picture_structure != s->field_select[dir][0] + 1 && s->pict_type != AV_PICTURE_TYPE_B && !s->first_field

  906.                 || !ref_picture[0]) {

  907.                 ref_picture = s->current_picture_ptr->f->data;

  908.             }

  909. 

  910.             mpeg_motion(s, dest_y, dest_cb, dest_cr,

  911.                         s->field_select[dir][0],

  912.                         ref_picture, pix_op,

  913.                         s->mv[dir][0][0], s->mv[dir][0][1], 16, mb_y >> 1);

  914.         }

  915.         break;

  916.     case MV_TYPE_16X8:

  917.         for (i = 0; i < 2; i++) {

  918.             uint8_t **ref2picture;

  919. 

  920.             if ((s->picture_structure == s->field_select[dir][i] + 1

  921.                 || s->pict_type == AV_PICTURE_TYPE_B || s->first_field) && ref_picture[0]) {

  922.                 ref2picture = ref_picture;

  923.             } else {

  924.                 ref2picture = s->current_picture_ptr->f->data;

  925.             }

  926. 

  927.             mpeg_motion(s, dest_y, dest_cb, dest_cr,

  928.                         s->field_select[dir][i],

  929.                         ref2picture, pix_op,

  930.                         s->mv[dir][i][0], s->mv[dir][i][1] + 16 * i,

  931.                         8, mb_y >> 1);

  932. 

  933.             dest_y  += 16 * s->linesize;

  934.             dest_cb += (16 >> s->chroma_y_shift) * s->uvlinesize;

  935.             dest_cr += (16 >> s->chroma_y_shift) * s->uvlinesize;

  936.         }

  937.         break;

  938.     case MV_TYPE_DMV:

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

  940.             for (i = 0; i < 2; i++) {

  941.                 int j;

  942.                 for (j = 0; j < 2; j++)

  943.                     mpeg_motion_field(s, dest_y, dest_cb, dest_cr,

  944.                                       j, j ^ i, ref_picture, pix_op,

  945.                                       s->mv[dir][2 * i + j][0],

  946.                                       s->mv[dir][2 * i + j][1], 8, mb_y);

  947.                 pix_op = s->hdsp.avg_pixels_tab;

  948.             }

  949.         } else {

  950.             if (!ref_picture[0]) {

  951.                 ref_picture = s->current_picture_ptr->f->data;

  952.             }

  953.             for (i = 0; i < 2; i++) {

  954.                 mpeg_motion(s, dest_y, dest_cb, dest_cr,

  955.                             s->picture_structure != i + 1,

  956.                             ref_picture, pix_op,

  957.                             s->mv[dir][2 * i][0], s->mv[dir][2 * i][1],

  958.                             16, mb_y >> 1);

  959. 

  960.                 // after put we make avg of the same block

  961.                 pix_op = s->hdsp.avg_pixels_tab;

  962. 

  963.                 /* opposite parity is always in the same frame if this is

  964.                  * second field */

  965.                 if (!s->first_field) {

  966.                     ref_picture = s->current_picture_ptr->f->data;

  967.                 }

  968.             }

  969.         }

  970.         break;

  971.     default: av_assert2(0);

  972.     }

  973. }

  974. 

  975. void ff_mpv_motion(MpegEncContext *s,

  976.                    uint8_t *dest_y, uint8_t *dest_cb,

  977.                    uint8_t *dest_cr, int dir,

  978.                    uint8_t **ref_picture,

  979.                    op_pixels_func (*pix_op)[4],

  980.                    qpel_mc_func (*qpix_op)[16])

  981. {

  982. #if !CONFIG_SMALL

  983.     if (s->out_format == FMT_MPEG1)

  984.         mpv_motion_internal(s, dest_y, dest_cb, dest_cr, dir,

  985.                             ref_picture, pix_op, qpix_op, 1);

  986.     else

  987. #endif

  988.         mpv_motion_internal(s, dest_y, dest_cb, dest_cr, dir,

  989.                             ref_picture, pix_op, qpix_op, 0);

  990. }