/*

  * Copyright (c) 2000,2001 Fabrice Bellard

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

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

  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 

 #include <string.h>

 #include "libavutil/avassert.h"

 #include "libavutil/internal.h"

 #include "avcodec.h"

 #include "h261.h"

 #include "mpegutils.h"

 #include "mpegvideo.h"
 #include "mjpegenc.h"
 #include "msmpeg4.h"

 #include "qpeldsp.h"

 #include <limits.h>
 

 static void gmc1_motion(MpegEncContext *s,
                         uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr,
                         uint8_t **ref_picture)

 {
     uint8_t *ptr;

     int src_x, src_y, motion_x, motion_y;

     ptrdiff_t offset, linesize, uvlinesize;

     int emu = 0;
 
     motion_x   = s->sprite_offset[0][0];
     motion_y   = s->sprite_offset[0][1];
     src_x      = s->mb_x * 16 + (motion_x >> (s->sprite_warping_accuracy + 1));
     src_y      = s->mb_y * 16 + (motion_y >> (s->sprite_warping_accuracy + 1));
     motion_x <<= (3 - s->sprite_warping_accuracy);
     motion_y <<= (3 - s->sprite_warping_accuracy);
     src_x      = av_clip(src_x, -16, s->width);

     if (src_x == s->width)

         motion_x = 0;

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

         motion_y = 0;

     linesize   = s->linesize;

     uvlinesize = s->uvlinesize;
 

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

     if ((unsigned)src_x >= FFMAX(s->h_edge_pos - 17, 0) ||
         (unsigned)src_y >= FFMAX(s->v_edge_pos - 17, 0)) {
         s->vdsp.emulated_edge_mc(s->edge_emu_buffer, ptr,
                                  linesize, linesize,
                                  17, 17,
                                  src_x, src_y,
                                  s->h_edge_pos, s->v_edge_pos);
         ptr = s->edge_emu_buffer;

     }
 

     if ((motion_x | motion_y) & 7) {

         s->mdsp.gmc1(dest_y, ptr, linesize, 16,
                      motion_x & 15, motion_y & 15, 128 - s->no_rounding);
         s->mdsp.gmc1(dest_y + 8, ptr + 8, linesize, 16,
                      motion_x & 15, motion_y & 15, 128 - s->no_rounding);

     } else {

         int dxy;
 

         dxy = ((motion_x >> 3) & 1) | ((motion_y >> 2) & 2);
         if (s->no_rounding) {

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

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

         }
     }
 

     if (CONFIG_GRAY && s->flags & CODEC_FLAG_GRAY)
         return;
 
     motion_x   = s->sprite_offset[1][0];
     motion_y   = s->sprite_offset[1][1];
     src_x      = s->mb_x * 8 + (motion_x >> (s->sprite_warping_accuracy + 1));
     src_y      = s->mb_y * 8 + (motion_y >> (s->sprite_warping_accuracy + 1));
     motion_x <<= (3 - s->sprite_warping_accuracy);
     motion_y <<= (3 - s->sprite_warping_accuracy);
     src_x      = av_clip(src_x, -8, s->width >> 1);
     if (src_x == s->width >> 1)
         motion_x = 0;
     src_y = av_clip(src_y, -8, s->height >> 1);
     if (src_y == s->height >> 1)
         motion_y = 0;

 
     offset = (src_y * uvlinesize) + src_x;

     ptr    = ref_picture[1] + offset;

     if ((unsigned)src_x >= FFMAX((s->h_edge_pos >> 1) - 9, 0) ||
         (unsigned)src_y >= FFMAX((s->v_edge_pos >> 1) - 9, 0)) {
         s->vdsp.emulated_edge_mc(s->edge_emu_buffer, ptr,
                                  uvlinesize, uvlinesize,
                                  9, 9,
                                  src_x, src_y,
                                  s->h_edge_pos >> 1, s->v_edge_pos >> 1);
         ptr = s->edge_emu_buffer;
         emu = 1;

     }

     s->mdsp.gmc1(dest_cb, ptr, uvlinesize, 8,
                  motion_x & 15, motion_y & 15, 128 - s->no_rounding);

 
     ptr = ref_picture[2] + offset;

     if (emu) {
         s->vdsp.emulated_edge_mc(s->edge_emu_buffer, ptr,

                                  uvlinesize, uvlinesize,

                                  9, 9,
                                  src_x, src_y,
                                  s->h_edge_pos >> 1, s->v_edge_pos >> 1);
         ptr = s->edge_emu_buffer;

     }

     s->mdsp.gmc1(dest_cr, ptr, uvlinesize, 8,
                  motion_x & 15, motion_y & 15, 128 - s->no_rounding);

 }
 

 static void gmc_motion(MpegEncContext *s,
                        uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr,
                        uint8_t **ref_picture)

 {
     uint8_t *ptr;
     int linesize, uvlinesize;

     const int a = s->sprite_warping_accuracy;

     int ox, oy;
 

     linesize   = s->linesize;

     uvlinesize = s->uvlinesize;
 
     ptr = ref_picture[0];
 

     ox = s->sprite_offset[0][0] + s->sprite_delta[0][0] * s->mb_x * 16 +
          s->sprite_delta[0][1] * s->mb_y * 16;
     oy = s->sprite_offset[0][1] + s->sprite_delta[1][0] * s->mb_x * 16 +
          s->sprite_delta[1][1] * s->mb_y * 16;

     s->mdsp.gmc(dest_y, ptr, linesize, 16,
                 ox, oy,
                 s->sprite_delta[0][0], s->sprite_delta[0][1],
                 s->sprite_delta[1][0], s->sprite_delta[1][1],
                 a + 1, (1 << (2 * a + 1)) - s->no_rounding,
                 s->h_edge_pos, s->v_edge_pos);
     s->mdsp.gmc(dest_y + 8, ptr, linesize, 16,
                 ox + s->sprite_delta[0][0] * 8,
                 oy + s->sprite_delta[1][0] * 8,
                 s->sprite_delta[0][0], s->sprite_delta[0][1],
                 s->sprite_delta[1][0], s->sprite_delta[1][1],
                 a + 1, (1 << (2 * a + 1)) - s->no_rounding,
                 s->h_edge_pos, s->v_edge_pos);

 
     if (CONFIG_GRAY && s->flags & CODEC_FLAG_GRAY)
         return;
 
     ox = s->sprite_offset[1][0] + s->sprite_delta[0][0] * s->mb_x * 8 +
          s->sprite_delta[0][1] * s->mb_y * 8;
     oy = s->sprite_offset[1][1] + s->sprite_delta[1][0] * s->mb_x * 8 +
          s->sprite_delta[1][1] * s->mb_y * 8;

 
     ptr = ref_picture[1];

     s->mdsp.gmc(dest_cb, ptr, uvlinesize, 8,
                 ox, oy,
                 s->sprite_delta[0][0], s->sprite_delta[0][1],
                 s->sprite_delta[1][0], s->sprite_delta[1][1],
                 a + 1, (1 << (2 * a + 1)) - s->no_rounding,
                 s->h_edge_pos >> 1, s->v_edge_pos >> 1);

 
     ptr = ref_picture[2];

     s->mdsp.gmc(dest_cr, ptr, uvlinesize, 8,
                 ox, oy,
                 s->sprite_delta[0][0], s->sprite_delta[0][1],
                 s->sprite_delta[1][0], s->sprite_delta[1][1],
                 a + 1, (1 << (2 * a + 1)) - s->no_rounding,
                 s->h_edge_pos >> 1, s->v_edge_pos >> 1);

 }
 
 static inline int hpel_motion(MpegEncContext *s,

                               uint8_t *dest, uint8_t *src,
                               int src_x, int src_y,
                               op_pixels_func *pix_op,
                               int motion_x, int motion_y)

 {

     int dxy = 0;

     int emu = 0;

 
     src_x += motion_x >> 1;
     src_y += motion_y >> 1;
 
     /* WARNING: do no forget half pels */

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

     if (src_x != s->width)
         dxy |= motion_x & 1;

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

     if (src_y != s->height)
         dxy |= (motion_y & 1) << 1;

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

         if ((unsigned)src_x > FFMAX(s->h_edge_pos - (motion_x & 1) - 8, 0) ||
             (unsigned)src_y > FFMAX(s->v_edge_pos - (motion_y & 1) - 8, 0)) {
             s->vdsp.emulated_edge_mc(s->edge_emu_buffer, src,

                                      s->linesize, s->linesize,

                                      9, 9,

                                      src_x, src_y,
                                      s->h_edge_pos, s->v_edge_pos);

             src = s->edge_emu_buffer;
             emu = 1;

         }

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

     return emu;
 }
 

 static av_always_inline

 void mpeg_motion_internal(MpegEncContext *s,

                           uint8_t *dest_y,
                           uint8_t *dest_cb,
                           uint8_t *dest_cr,
                           int field_based,
                           int bottom_field,
                           int field_select,
                           uint8_t **ref_picture,
                           op_pixels_func (*pix_op)[4],
                           int motion_x,
                           int motion_y,
                           int h,
                           int is_mpeg12,
                           int mb_y)

 {
     uint8_t *ptr_y, *ptr_cb, *ptr_cr;

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

         uvsrc_x, uvsrc_y, v_edge_pos;

     ptrdiff_t uvlinesize, linesize;

 
 #if 0

     if (s->quarter_sample) {
         motion_x >>= 1;
         motion_y >>= 1;
     }

 #endif
 
     v_edge_pos = s->v_edge_pos >> field_based;

     linesize   = s->current_picture.f->linesize[0] << field_based;
     uvlinesize = s->current_picture.f->linesize[1] << field_based;

     dxy   = ((motion_y & 1) << 1) | (motion_x & 1);
     src_x = s->mb_x * 16 + (motion_x >> 1);
     src_y = (mb_y << (4 - field_based)) + (motion_y >> 1);

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

         if ((s->workaround_bugs & FF_BUG_HPEL_CHROMA) && field_based) {
             mx      = (motion_x >> 1) | (motion_x & 1);
             my      = motion_y >> 1;
             uvdxy   = ((my & 1) << 1) | (mx & 1);
             uvsrc_x = s->mb_x * 8 + (mx >> 1);
             uvsrc_y = (mb_y << (3 - field_based)) + (my >> 1);
         } else {
             uvdxy   = dxy | (motion_y & 2) | ((motion_x & 2) >> 1);
             uvsrc_x = src_x >> 1;
             uvsrc_y = src_y >> 1;

         }

     // Even chroma mv's are full pel in H261
     } else if (!is_mpeg12 && s->out_format == FMT_H261) {
         mx      = motion_x / 4;
         my      = motion_y / 4;
         uvdxy   = 0;
         uvsrc_x = s->mb_x * 8 + mx;
         uvsrc_y = mb_y * 8 + my;

     } else {

         if (s->chroma_y_shift) {
             mx      = motion_x / 2;
             my      = motion_y / 2;
             uvdxy   = ((my & 1) << 1) | (mx & 1);
             uvsrc_x = s->mb_x * 8 + (mx >> 1);
             uvsrc_y = (mb_y << (3 - field_based)) + (my >> 1);

         } else {

             if (s->chroma_x_shift) {
                 // Chroma422
                 mx      = motion_x / 2;
                 uvdxy   = ((motion_y & 1) << 1) | (mx & 1);
                 uvsrc_x = s->mb_x * 8 + (mx >> 1);

                 uvsrc_y = src_y;
             } else {

                 // Chroma444
                 uvdxy   = dxy;

                 uvsrc_x = src_x;
                 uvsrc_y = src_y;
             }
         }
     }
 
     ptr_y  = ref_picture[0] + src_y * linesize + src_x;
     ptr_cb = ref_picture[1] + uvsrc_y * uvlinesize + uvsrc_x;
     ptr_cr = ref_picture[2] + uvsrc_y * uvlinesize + uvsrc_x;
 

     if ((unsigned)src_x > FFMAX(s->h_edge_pos - (motion_x & 1) - 16, 0) ||

         (unsigned)src_y > FFMAX(   v_edge_pos - (motion_y & 1) - h , 0)) {

         if (is_mpeg12 ||
             s->codec_id == AV_CODEC_ID_MPEG2VIDEO ||
             s->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
             av_log(s->avctx, AV_LOG_DEBUG,
                    "MPEG motion vector out of boundary (%d %d)\n", src_x,
                    src_y);
             return;
         }
         s->vdsp.emulated_edge_mc(s->edge_emu_buffer, ptr_y,

                                  s->linesize, s->linesize,

                                  17, 17 + field_based,
                                  src_x, src_y << field_based,
                                  s->h_edge_pos, s->v_edge_pos);
         ptr_y = s->edge_emu_buffer;
         if (!CONFIG_GRAY || !(s->flags & CODEC_FLAG_GRAY)) {

             uint8_t *ubuf = s->edge_emu_buffer + 18 * s->linesize;
             uint8_t *vbuf = ubuf + 9 * s->uvlinesize;
             s->vdsp.emulated_edge_mc(ubuf, ptr_cb,

                                      s->uvlinesize, s->uvlinesize,

                                      9, 9 + field_based,
                                      uvsrc_x, uvsrc_y << field_based,
                                      s->h_edge_pos >> 1, s->v_edge_pos >> 1);

             s->vdsp.emulated_edge_mc(vbuf, ptr_cr,

                                      s->uvlinesize, s->uvlinesize,

                                      9, 9 + field_based,
                                      uvsrc_x, uvsrc_y << field_based,
                                      s->h_edge_pos >> 1, s->v_edge_pos >> 1);

             ptr_cb = ubuf;
             ptr_cr = vbuf;

         }

     }
 

     /* FIXME use this for field pix too instead of the obnoxious hack which
      * changes picture.data */
     if (bottom_field) {
         dest_y  += s->linesize;
         dest_cb += s->uvlinesize;
         dest_cr += s->uvlinesize;

     }
 

     if (field_select) {
         ptr_y  += s->linesize;
         ptr_cb += s->uvlinesize;
         ptr_cr += s->uvlinesize;

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

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

         pix_op[s->chroma_x_shift][uvdxy]

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

         pix_op[s->chroma_x_shift][uvdxy]

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

     }

     if (!is_mpeg12 && (CONFIG_H261_ENCODER || CONFIG_H261_DECODER) &&
         s->out_format == FMT_H261) {

         ff_h261_loop_filter(s);
     }
 }

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

 static void mpeg_motion(MpegEncContext *s,
                         uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr,
                         int field_select, uint8_t **ref_picture,
                         op_pixels_func (*pix_op)[4],
                         int motion_x, int motion_y, int h, int mb_y)

 {

 #if !CONFIG_SMALL

     if (s->out_format == FMT_MPEG1)

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

                              field_select, ref_picture, pix_op,
                              motion_x, motion_y, h, 1, mb_y);

     else
 #endif
         mpeg_motion_internal(s, dest_y, dest_cb, dest_cr, 0, 0,

                              field_select, ref_picture, pix_op,
                              motion_x, motion_y, h, 0, mb_y);

 }
 
 static void mpeg_motion_field(MpegEncContext *s, uint8_t *dest_y,
                               uint8_t *dest_cb, uint8_t *dest_cr,
                               int bottom_field, int field_select,
                               uint8_t **ref_picture,
                               op_pixels_func (*pix_op)[4],
                               int motion_x, int motion_y, int h, int mb_y)
 {
 #if !CONFIG_SMALL

     if (s->out_format == FMT_MPEG1)

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

                              bottom_field, field_select, ref_picture, pix_op,
                              motion_x, motion_y, h, 1, mb_y);

     else
 #endif

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

                              bottom_field, field_select, ref_picture, pix_op,
                              motion_x, motion_y, h, 0, mb_y);

 }

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

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

     int x;

     uint8_t *const top    = src[1];
     uint8_t *const left   = src[2];
     uint8_t *const mid    = src[0];
     uint8_t *const right  = src[3];
     uint8_t *const bottom = src[4];

 #define OBMC_FILTER(x, t, l, m, r, b)\
     dst[x]= (t*top[x] + l*left[x] + m*mid[x] + r*right[x] + b*bottom[x] + 4)>>3
 #define OBMC_FILTER4(x, t, l, m, r, b)\
     OBMC_FILTER(x         , t, l, m, r, b);\
     OBMC_FILTER(x+1       , t, l, m, r, b);\
     OBMC_FILTER(x  +stride, t, l, m, r, b);\
     OBMC_FILTER(x+1+stride, t, l, m, r, b);
 

     x = 0;
     OBMC_FILTER (x    , 2, 2, 4, 0, 0);
     OBMC_FILTER (x + 1, 2, 1, 5, 0, 0);
     OBMC_FILTER4(x + 2, 2, 1, 5, 0, 0);
     OBMC_FILTER4(x + 4, 2, 0, 5, 1, 0);
     OBMC_FILTER (x + 6, 2, 0, 5, 1, 0);
     OBMC_FILTER (x + 7, 2, 0, 4, 2, 0);
     x += stride;
     OBMC_FILTER (x    , 1, 2, 5, 0, 0);
     OBMC_FILTER (x + 1, 1, 2, 5, 0, 0);
     OBMC_FILTER (x + 6, 1, 0, 5, 2, 0);
     OBMC_FILTER (x + 7, 1, 0, 5, 2, 0);
     x += stride;
     OBMC_FILTER4(x    , 1, 2, 5, 0, 0);
     OBMC_FILTER4(x + 2, 1, 1, 6, 0, 0);
     OBMC_FILTER4(x + 4, 1, 0, 6, 1, 0);
     OBMC_FILTER4(x + 6, 1, 0, 5, 2, 0);
     x += 2 * stride;
     OBMC_FILTER4(x    , 0, 2, 5, 0, 1);
     OBMC_FILTER4(x + 2, 0, 1, 6, 0, 1);
     OBMC_FILTER4(x + 4, 0, 0, 6, 1, 1);
     OBMC_FILTER4(x + 6, 0, 0, 5, 2, 1);
     x += 2*stride;
     OBMC_FILTER (x    , 0, 2, 5, 0, 1);
     OBMC_FILTER (x + 1, 0, 2, 5, 0, 1);
     OBMC_FILTER4(x + 2, 0, 1, 5, 0, 2);
     OBMC_FILTER4(x + 4, 0, 0, 5, 1, 2);
     OBMC_FILTER (x + 6, 0, 0, 5, 2, 1);
     OBMC_FILTER (x + 7, 0, 0, 5, 2, 1);
     x += stride;
     OBMC_FILTER (x    , 0, 2, 4, 0, 2);
     OBMC_FILTER (x + 1, 0, 1, 5, 0, 2);
     OBMC_FILTER (x + 6, 0, 0, 5, 1, 2);
     OBMC_FILTER (x + 7, 0, 0, 4, 2, 2);

 }
 
 /* obmc for 1 8x8 luma block */
 static inline void obmc_motion(MpegEncContext *s,
                                uint8_t *dest, uint8_t *src,
                                int src_x, int src_y,
                                op_pixels_func *pix_op,

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

 #define MID    0
 {
     int i;
     uint8_t *ptr[5];
 

     av_assert2(s->quarter_sample == 0);

     for (i = 0; i < 5; i++) {
         if (i && mv[i][0] == mv[MID][0] && mv[i][1] == mv[MID][1]) {
             ptr[i] = ptr[MID];
         } else {
             ptr[i] = s->obmc_scratchpad + 8 * (i & 1) +
                      s->linesize * 8 * (i >> 1);
             hpel_motion(s, ptr[i], src, src_x, src_y, pix_op,

                         mv[i][0], mv[i][1]);
         }
     }
 
     put_obmc(dest, ptr, s->linesize);
 }
 
 static inline void qpel_motion(MpegEncContext *s,

                                uint8_t *dest_y,
                                uint8_t *dest_cb,
                                uint8_t *dest_cr,
                                int field_based, int bottom_field,
                                int field_select, uint8_t **ref_picture,
                                op_pixels_func (*pix_op)[4],

                                qpel_mc_func (*qpix_op)[16],
                                int motion_x, int motion_y, int h)
 {
     uint8_t *ptr_y, *ptr_cb, *ptr_cr;

     int dxy, uvdxy, mx, my, src_x, src_y, uvsrc_x, uvsrc_y, v_edge_pos;
     ptrdiff_t linesize, uvlinesize;

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

     src_x = s->mb_x *  16                 + (motion_x >> 2);
     src_y = s->mb_y * (16 >> field_based) + (motion_y >> 2);
 
     v_edge_pos = s->v_edge_pos >> field_based;

     linesize   = s->linesize   << field_based;

     uvlinesize = s->uvlinesize << field_based;
 

     if (field_based) {
         mx = motion_x / 2;
         my = motion_y >> 1;
     } else if (s->workaround_bugs & FF_BUG_QPEL_CHROMA2) {
         static const int rtab[8] = { 0, 0, 1, 1, 0, 0, 0, 1 };
         mx = (motion_x >> 1) + rtab[motion_x & 7];
         my = (motion_y >> 1) + rtab[motion_y & 7];
     } else if (s->workaround_bugs & FF_BUG_QPEL_CHROMA) {
         mx = (motion_x >> 1) | (motion_x & 1);
         my = (motion_y >> 1) | (motion_y & 1);
     } else {
         mx = motion_x / 2;
         my = motion_y / 2;

     }

     mx = (mx >> 1) | (mx & 1);
     my = (my >> 1) | (my & 1);

     uvdxy = (mx & 1) | ((my & 1) << 1);
     mx  >>= 1;
     my  >>= 1;

 
     uvsrc_x = s->mb_x *  8                 + mx;
     uvsrc_y = s->mb_y * (8 >> field_based) + my;
 

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

     ptr_cb = ref_picture[1] + uvsrc_y * uvlinesize + uvsrc_x;
     ptr_cr = ref_picture[2] + uvsrc_y * uvlinesize + uvsrc_x;
 

     if ((unsigned)src_x > FFMAX(s->h_edge_pos - (motion_x & 3) - 16, 0) ||

         (unsigned)src_y > FFMAX(   v_edge_pos - (motion_y & 3) - h, 0)) {

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

                                  s->linesize, s->linesize,

                                  17, 17 + field_based,
                                  src_x, src_y << field_based,

                                  s->h_edge_pos, s->v_edge_pos);

         ptr_y = s->edge_emu_buffer;
         if (!CONFIG_GRAY || !(s->flags & CODEC_FLAG_GRAY)) {

             uint8_t *ubuf = s->edge_emu_buffer + 18 * s->linesize;
             uint8_t *vbuf = ubuf + 9 * s->uvlinesize;
             s->vdsp.emulated_edge_mc(ubuf, ptr_cb,

                                      s->uvlinesize, s->uvlinesize,

                                      9, 9 + field_based,

                                      uvsrc_x, uvsrc_y << field_based,
                                      s->h_edge_pos >> 1, s->v_edge_pos >> 1);

             s->vdsp.emulated_edge_mc(vbuf, ptr_cr,

                                      s->uvlinesize, s->uvlinesize,

                                      9, 9 + field_based,

                                      uvsrc_x, uvsrc_y << field_based,
                                      s->h_edge_pos >> 1, s->v_edge_pos >> 1);

             ptr_cb = ubuf;
             ptr_cr = vbuf;

         }
     }
 

     if (!field_based)

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

     else {
         if (bottom_field) {
             dest_y  += s->linesize;
             dest_cb += s->uvlinesize;
             dest_cr += s->uvlinesize;

         }
 

         if (field_select) {

             ptr_y  += s->linesize;
             ptr_cb += s->uvlinesize;
             ptr_cr += s->uvlinesize;
         }

         // damn interlaced mode
         // FIXME boundary mirroring is not exactly correct here
         qpix_op[1][dxy](dest_y, ptr_y, linesize);
         qpix_op[1][dxy](dest_y + 8, ptr_y + 8, linesize);

     }

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

         pix_op[1][uvdxy](dest_cr, ptr_cr, uvlinesize, h >> 1);
         pix_op[1][uvdxy](dest_cb, ptr_cb, uvlinesize, h >> 1);
     }
 }
 
 /**

  * h263 chroma 4mv motion compensation.

  */

 static void chroma_4mv_motion(MpegEncContext *s,
                               uint8_t *dest_cb, uint8_t *dest_cr,
                               uint8_t **ref_picture,
                               op_pixels_func *pix_op,
                               int mx, int my)
 {

     uint8_t *ptr;

     int src_x, src_y, dxy, emu = 0;
     ptrdiff_t offset;

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

      * with a special rounding */
     mx = ff_h263_round_chroma(mx);
     my = ff_h263_round_chroma(my);

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

     mx >>= 1;
     my >>= 1;
 
     src_x = s->mb_x * 8 + mx;
     src_y = s->mb_y * 8 + my;

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

         dxy &= ~1;

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

         dxy &= ~2;
 

     offset = src_y * s->uvlinesize + src_x;

     ptr    = ref_picture[1] + offset;

     if ((unsigned)src_x > FFMAX((s->h_edge_pos >> 1) - (dxy & 1) - 8, 0) ||
         (unsigned)src_y > FFMAX((s->v_edge_pos >> 1) - (dxy >> 1) - 8, 0)) {
         s->vdsp.emulated_edge_mc(s->edge_emu_buffer, ptr,
                                  s->uvlinesize, s->uvlinesize,
                                  9, 9, src_x, src_y,
                                  s->h_edge_pos >> 1, s->v_edge_pos >> 1);
         ptr = s->edge_emu_buffer;
         emu = 1;

     }
     pix_op[dxy](dest_cb, ptr, s->uvlinesize, 8);
 
     ptr = ref_picture[2] + offset;

     if (emu) {

         s->vdsp.emulated_edge_mc(s->edge_emu_buffer, ptr,
                                  s->uvlinesize, s->uvlinesize,

                                  9, 9, src_x, src_y,
                                  s->h_edge_pos >> 1, s->v_edge_pos >> 1);
         ptr = s->edge_emu_buffer;

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

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

     /* fetch pixels for estimated mv 4 macroblocks ahead
      * optimized for 64byte cache lines */
     const int shift = s->quarter_sample ? 2 : 1;

     const int mx    = (s->mv[dir][0][0] >> shift) + 16 * s->mb_x + 8;
     const int my    = (s->mv[dir][0][1] >> shift) + 16 * s->mb_y;
     int off         = mx + (my + (s->mb_x & 3) * 4) * s->linesize + 64;
 
     s->vdsp.prefetch(pix[0] + off, s->linesize, 4);
     off = (mx >> 1) + ((my >> 1) + (s->mb_x & 7)) * s->uvlinesize + 64;
     s->vdsp.prefetch(pix[1] + off, pix[2] - pix[1], 2);

 }
 

 static inline void apply_obmc(MpegEncContext *s,
                               uint8_t *dest_y,
                               uint8_t *dest_cb,
                               uint8_t *dest_cr,
                               uint8_t **ref_picture,
                               op_pixels_func (*pix_op)[4])
 {
     LOCAL_ALIGNED_8(int16_t, mv_cache, [4], [4][2]);
     Picture *cur_frame   = &s->current_picture;
     int mb_x = s->mb_x;
     int mb_y = s->mb_y;
     const int xy         = mb_x + mb_y * s->mb_stride;
     const int mot_stride = s->b8_stride;
     const int mot_xy     = mb_x * 2 + mb_y * 2 * mot_stride;
     int mx, my, i;
 

     av_assert2(!s->mb_skipped);

 
     AV_COPY32(mv_cache[1][1], cur_frame->motion_val[0][mot_xy]);
     AV_COPY32(mv_cache[1][2], cur_frame->motion_val[0][mot_xy + 1]);
 
     AV_COPY32(mv_cache[2][1],
               cur_frame->motion_val[0][mot_xy + mot_stride]);
     AV_COPY32(mv_cache[2][2],
               cur_frame->motion_val[0][mot_xy + mot_stride + 1]);
 
     AV_COPY32(mv_cache[3][1],
               cur_frame->motion_val[0][mot_xy + mot_stride]);
     AV_COPY32(mv_cache[3][2],
               cur_frame->motion_val[0][mot_xy + mot_stride + 1]);
 
     if (mb_y == 0 || IS_INTRA(cur_frame->mb_type[xy - s->mb_stride])) {
         AV_COPY32(mv_cache[0][1], mv_cache[1][1]);
         AV_COPY32(mv_cache[0][2], mv_cache[1][2]);
     } else {
         AV_COPY32(mv_cache[0][1],
                   cur_frame->motion_val[0][mot_xy - mot_stride]);
         AV_COPY32(mv_cache[0][2],
                   cur_frame->motion_val[0][mot_xy - mot_stride + 1]);
     }
 
     if (mb_x == 0 || IS_INTRA(cur_frame->mb_type[xy - 1])) {
         AV_COPY32(mv_cache[1][0], mv_cache[1][1]);
         AV_COPY32(mv_cache[2][0], mv_cache[2][1]);
     } else {
         AV_COPY32(mv_cache[1][0], cur_frame->motion_val[0][mot_xy - 1]);
         AV_COPY32(mv_cache[2][0],
                   cur_frame->motion_val[0][mot_xy - 1 + mot_stride]);
     }
 
     if (mb_x + 1 >= s->mb_width || IS_INTRA(cur_frame->mb_type[xy + 1])) {
         AV_COPY32(mv_cache[1][3], mv_cache[1][2]);
         AV_COPY32(mv_cache[2][3], mv_cache[2][2]);
     } else {
         AV_COPY32(mv_cache[1][3], cur_frame->motion_val[0][mot_xy + 2]);
         AV_COPY32(mv_cache[2][3],
                   cur_frame->motion_val[0][mot_xy + 2 + mot_stride]);
     }
 
     mx = 0;
     my = 0;
     for (i = 0; i < 4; i++) {
         const int x      = (i & 1) + 1;
         const int y      = (i >> 1) + 1;
         int16_t mv[5][2] = {
             { mv_cache[y][x][0],     mv_cache[y][x][1]         },
             { mv_cache[y - 1][x][0], mv_cache[y - 1][x][1]     },
             { mv_cache[y][x - 1][0], mv_cache[y][x - 1][1]     },
             { mv_cache[y][x + 1][0], mv_cache[y][x + 1][1]     },
             { mv_cache[y + 1][x][0], mv_cache[y + 1][x][1]     }
         };
         // FIXME cleanup
         obmc_motion(s, dest_y + ((i & 1) * 8) + (i >> 1) * 8 * s->linesize,
                     ref_picture[0],
                     mb_x * 16 + (i & 1) * 8, mb_y * 16 + (i >> 1) * 8,
                     pix_op[1],
                     mv);
 
         mx += mv[0][0];
         my += mv[0][1];
     }
     if (!CONFIG_GRAY || !(s->flags & CODEC_FLAG_GRAY))
         chroma_4mv_motion(s, dest_cb, dest_cr,
                           ref_picture, pix_op[1],
                           mx, my);
 }
 

 static inline void apply_8x8(MpegEncContext *s,
                              uint8_t *dest_y,
                              uint8_t *dest_cb,
                              uint8_t *dest_cr,
                              int dir,
                              uint8_t **ref_picture,
                              qpel_mc_func (*qpix_op)[16],
                              op_pixels_func (*pix_op)[4])
 {
     int dxy, mx, my, src_x, src_y;
     int i;
     int mb_x = s->mb_x;
     int mb_y = s->mb_y;
     uint8_t *ptr, *dest;
 
     mx = 0;
     my = 0;
     if (s->quarter_sample) {
         for (i = 0; i < 4; i++) {
             int motion_x = s->mv[dir][i][0];
             int motion_y = s->mv[dir][i][1];
 
             dxy   = ((motion_y & 3) << 2) | (motion_x & 3);
             src_x = mb_x * 16 + (motion_x >> 2) + (i & 1) * 8;
             src_y = mb_y * 16 + (motion_y >> 2) + (i >> 1) * 8;
 
             /* WARNING: do no forget half pels */
             src_x = av_clip(src_x, -16, s->width);
             if (src_x == s->width)
                 dxy &= ~3;
             src_y = av_clip(src_y, -16, s->height);
             if (src_y == s->height)
                 dxy &= ~12;
 
             ptr = ref_picture[0] + (src_y * s->linesize) + (src_x);

             if ((unsigned)src_x > FFMAX(s->h_edge_pos - (motion_x & 3) - 8, 0) ||
                 (unsigned)src_y > FFMAX(s->v_edge_pos - (motion_y & 3) - 8, 0)) {
                 s->vdsp.emulated_edge_mc(s->edge_emu_buffer, ptr,
                                          s->linesize, s->linesize,
                                          9, 9,
                                          src_x, src_y,
                                          s->h_edge_pos,
                                          s->v_edge_pos);
                 ptr = s->edge_emu_buffer;

             }
             dest = dest_y + ((i & 1) * 8) + (i >> 1) * 8 * s->linesize;
             qpix_op[1][dxy](dest, ptr, s->linesize);
 
             mx += s->mv[dir][i][0] / 2;
             my += s->mv[dir][i][1] / 2;
         }
     } else {
         for (i = 0; i < 4; i++) {
             hpel_motion(s,
                         dest_y + ((i & 1) * 8) + (i >> 1) * 8 * s->linesize,
                         ref_picture[0],
                         mb_x * 16 + (i & 1) * 8,
                         mb_y * 16 + (i >> 1) * 8,
                         pix_op[1],
                         s->mv[dir][i][0],
                         s->mv[dir][i][1]);
 
             mx += s->mv[dir][i][0];
             my += s->mv[dir][i][1];
         }
     }
 
     if (!CONFIG_GRAY || !(s->flags & CODEC_FLAG_GRAY))
         chroma_4mv_motion(s, dest_cb, dest_cr,
                           ref_picture, pix_op[1], mx, my);
 }
 

 /**
  * motion compensation of a single macroblock
  * @param s context
  * @param dest_y luma destination pointer
  * @param dest_cb chroma cb/u destination pointer
  * @param dest_cr chroma cr/v destination pointer
  * @param dir direction (0->forward, 1->backward)
  * @param ref_picture array[3] of pointers to the 3 planes of the reference picture

  * @param pix_op halfpel motion compensation function (average or put normally)
  * @param qpix_op qpel motion compensation function (average or put normally)

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

 static av_always_inline void mpv_motion_internal(MpegEncContext *s,

                                                  uint8_t *dest_y,
                                                  uint8_t *dest_cb,
                                                  uint8_t *dest_cr,
                                                  int dir,
                                                  uint8_t **ref_picture,
                                                  op_pixels_func (*pix_op)[4],
                                                  qpel_mc_func (*qpix_op)[16],
                                                  int is_mpeg12)

 {

     int i;
     int mb_y = s->mb_y;

 
     prefetch_motion(s, ref_picture, dir);
 

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

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

         return;
     }
 

     switch (s->mv_type) {

     case MV_TYPE_16X16:

         if (s->mcsel) {
             if (s->real_sprite_warping_points == 1) {

                 gmc1_motion(s, dest_y, dest_cb, dest_cr,
                             ref_picture);

             } else {

                 gmc_motion(s, dest_y, dest_cb, dest_cr,

                            ref_picture);

             }

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

             qpel_motion(s, dest_y, dest_cb, dest_cr,
                         0, 0, 0,
                         ref_picture, pix_op, qpix_op,
                         s->mv[dir][0][0], s->mv[dir][0][1], 16);

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

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

             ff_mspel_motion(s, dest_y, dest_cb, dest_cr,

                             ref_picture, pix_op,
                             s->mv[dir][0][0], s->mv[dir][0][1], 16);
         } else {

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

                         ref_picture, pix_op,

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

         }
         break;
     case MV_TYPE_8X8:

         if (!is_mpeg12)
             apply_8x8(s, dest_y, dest_cb, dest_cr,
                       dir, ref_picture, qpix_op, pix_op);

         break;
     case MV_TYPE_FIELD:
         if (s->picture_structure == PICT_FRAME) {

             if (!is_mpeg12 && s->quarter_sample) {
                 for (i = 0; i < 2; i++)

                     qpel_motion(s, dest_y, dest_cb, dest_cr,
                                 1, i, s->field_select[dir][i],
                                 ref_picture, pix_op, qpix_op,
                                 s->mv[dir][i][0], s->mv[dir][i][1], 8);

             } else {

                 /* top field */

                 mpeg_motion_field(s, dest_y, dest_cb, dest_cr,
                                   0, s->field_select[dir][0],
                                   ref_picture, pix_op,
                                   s->mv[dir][0][0], s->mv[dir][0][1], 8, mb_y);

                 /* bottom field */

                 mpeg_motion_field(s, dest_y, dest_cb, dest_cr,
                                   1, s->field_select[dir][1],
                                   ref_picture, pix_op,
                                   s->mv[dir][1][0], s->mv[dir][1][1], 8, mb_y);

             }
         } else {

             if (   s->picture_structure != s->field_select[dir][0] + 1 && s->pict_type != AV_PICTURE_TYPE_B && !s->first_field
                 || !ref_picture[0]) {

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

             }
 
             mpeg_motion(s, dest_y, dest_cb, dest_cr,

                         s->field_select[dir][0],

                         ref_picture, pix_op,

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

         }
         break;
     case MV_TYPE_16X8:

         for (i = 0; i < 2; i++) {
             uint8_t **ref2picture;

             if ((s->picture_structure == s->field_select[dir][i] + 1
                 || s->pict_type == AV_PICTURE_TYPE_B || s->first_field) && ref_picture[0]) {

                 ref2picture = ref_picture;
             } else {

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

             }
 
             mpeg_motion(s, dest_y, dest_cb, dest_cr,

                         s->field_select[dir][i],

                         ref2picture, pix_op,

                         s->mv[dir][i][0], s->mv[dir][i][1] + 16 * i,
                         8, mb_y >> 1);

             dest_y  += 16 * s->linesize;
             dest_cb += (16 >> s->chroma_y_shift) * s->uvlinesize;
             dest_cr += (16 >> s->chroma_y_shift) * s->uvlinesize;

         }
         break;
     case MV_TYPE_DMV:

         if (s->picture_structure == PICT_FRAME) {
             for (i = 0; i < 2; i++) {

                 int j;

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

                     mpeg_motion_field(s, dest_y, dest_cb, dest_cr,

                                       j, j ^ i, ref_picture, pix_op,
                                       s->mv[dir][2 * i + j][0],
                                       s->mv[dir][2 * i + j][1], 8, mb_y);

                 pix_op = s->hdsp.avg_pixels_tab;

             }

         } else {

             if (!ref_picture[0]) {

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

             }

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

                 mpeg_motion(s, dest_y, dest_cb, dest_cr,

                             s->picture_structure != i + 1,

                             ref_picture, pix_op,

                             s->mv[dir][2 * i][0], s->mv[dir][2 * i][1],
                             16, mb_y >> 1);

 
                 // after put we make avg of the same block

                 pix_op = s->hdsp.avg_pixels_tab;

                 /* opposite parity is always in the same frame if this is
                  * second field */
                 if (!s->first_field) {

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

                 }
             }
         }

         break;

     default: av_assert2(0);

     }
 }
 

 void ff_mpv_motion(MpegEncContext *s,

                    uint8_t *dest_y, uint8_t *dest_cb,
                    uint8_t *dest_cr, int dir,
                    uint8_t **ref_picture,
                    op_pixels_func (*pix_op)[4],
                    qpel_mc_func (*qpix_op)[16])

 {

 #if !CONFIG_SMALL

     if (s->out_format == FMT_MPEG1)

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

                             ref_picture, pix_op, qpix_op, 1);
     else
 #endif

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

                             ref_picture, pix_op, qpix_op, 0);
 }