/*
  * The simplest mpeg encoder (well, it was the simplest!)

  * 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
  */
 
 /**

  * @file

  * The simplest mpeg encoder (well, it was the simplest!).
  */
 

 #ifndef AVCODEC_MPEGVIDEO_COMMON_H
 #define AVCODEC_MPEGVIDEO_COMMON_H

 #include <string.h>

 #include "avcodec.h"
 #include "dsputil.h"
 #include "mpegvideo.h"
 #include "mjpegenc.h"
 #include "msmpeg4.h"
 #include "faandct.h"
 #include <limits.h>
 
 int dct_quantize_c(MpegEncContext *s, DCTELEM *block, int n, int qscale, int *overflow);
 
 /**
  * allocates a Picture
  * The pixels are allocated/set by calling get_buffer() if shared=0
  */
 int alloc_picture(MpegEncContext *s, Picture *pic, int shared);
 
 /**
  * sets the given MpegEncContext to common defaults (same for encoding and decoding).
  * the changed fields will not depend upon the prior state of the MpegEncContext.
  */
 void MPV_common_defaults(MpegEncContext *s);
 
 static inline 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 offset, src_x, src_y, linesize, uvlinesize;
     int motion_x, motion_y;
     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(s->flags&CODEC_FLAG_EMU_EDGE){
         if(   (unsigned)src_x >= s->h_edge_pos - 17
            || (unsigned)src_y >= s->v_edge_pos - 17){

             s->dsp.emulated_edge_mc(s->edge_emu_buffer, ptr, 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->dsp.gmc1(dest_y  , ptr  , linesize, 16, motion_x&15, motion_y&15, 128 - s->no_rounding);
         s->dsp.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->dsp.put_no_rnd_pixels_tab[0][dxy](dest_y, ptr, linesize, 16);
         }else{
             s->dsp.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(s->flags&CODEC_FLAG_EMU_EDGE){
         if(   (unsigned)src_x >= (s->h_edge_pos>>1) - 9
            || (unsigned)src_y >= (s->v_edge_pos>>1) - 9){

             s->dsp.emulated_edge_mc(s->edge_emu_buffer, ptr, 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->dsp.gmc1(dest_cb, ptr, uvlinesize, 8, motion_x&15, motion_y&15, 128 - s->no_rounding);
 
     ptr = ref_picture[2] + offset;
     if(emu){

         s->dsp.emulated_edge_mc(s->edge_emu_buffer, ptr, uvlinesize, 9, 9, src_x, src_y, s->h_edge_pos>>1, s->v_edge_pos>>1);

         ptr= s->edge_emu_buffer;
     }
     s->dsp.gmc1(dest_cr, ptr, uvlinesize, 8, motion_x&15, motion_y&15, 128 - s->no_rounding);
 
     return;
 }
 
 static inline 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->dsp.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->dsp.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->dsp.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->dsp.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 field_based, int field_select,
                                   int src_x, int src_y,
                                   int width, int height, int stride,
                                   int h_edge_pos, int v_edge_pos,
                                   int w, int h, op_pixels_func *pix_op,
                                   int motion_x, int motion_y)
 {
     int dxy;
     int emu=0;
 
     dxy = ((motion_y & 1) << 1) | (motion_x & 1);
     src_x += motion_x >> 1;
     src_y += motion_y >> 1;
 
     /* WARNING: do no forget half pels */
     src_x = av_clip(src_x, -16, width); //FIXME unneeded for emu?
     if (src_x == width)
         dxy &= ~1;
     src_y = av_clip(src_y, -16, height);
     if (src_y == height)
         dxy &= ~2;
     src += src_y * stride + src_x;
 
     if(s->unrestricted_mv && (s->flags&CODEC_FLAG_EMU_EDGE)){
         if(   (unsigned)src_x > h_edge_pos - (motion_x&1) - w
            || (unsigned)src_y > v_edge_pos - (motion_y&1) - h){

             s->dsp.emulated_edge_mc(s->edge_emu_buffer, src, s->linesize, w+1, (h+1)<<field_based,

                              src_x, src_y<<field_based, h_edge_pos, s->v_edge_pos);
             src= s->edge_emu_buffer;
             emu=1;
         }
     }
     if(field_select)
         src += s->linesize;
     pix_op[dxy](dest, src, stride, h);
     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, 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;
         }

     }else if(!is_mpeg12 && s->out_format == FMT_H261){//even chroma mv's are full pel in 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 > s->h_edge_pos - (motion_x&1) - 16
        || (unsigned)src_y >    v_edge_pos - (motion_y&1) - h){

             if(is_mpeg12 || s->codec_id == CODEC_ID_MPEG2VIDEO ||

                s->codec_id == 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->dsp.emulated_edge_mc(s->edge_emu_buffer, ptr_y, 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 *uvbuf= s->edge_emu_buffer+18*s->linesize;

                 s->dsp.emulated_edge_mc(uvbuf ,

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

                 s->dsp.emulated_edge_mc(uvbuf+16,

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

                 ptr_cb= uvbuf;
                 ptr_cr= uvbuf+16;
             }
     }
 
     if(bottom_field){ //FIXME use this for field pix too instead of the obnoxious hack which changes picture.data
         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 av_always_inline
 void mpeg_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],

                  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, field_based,
                     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, field_based,
                     bottom_field, field_select, ref_picture, pix_op,

                     motion_x, motion_y, h, 0, mb_y);

 }

 
 //FIXME move to dsputil, 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];
 
     assert(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, 0, 0,
                         src_x, src_y,
                         s->width, s->height, s->linesize,
                         s->h_edge_pos, s->v_edge_pos,
                         8, 8, 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, 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 > s->h_edge_pos - (motion_x&3) - 16
        || (unsigned)src_y >    v_edge_pos - (motion_y&3) - h  ){

         s->dsp.emulated_edge_mc(s->edge_emu_buffer, ptr_y, 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 *uvbuf= s->edge_emu_buffer + 18*s->linesize;

             s->dsp.emulated_edge_mc(uvbuf, ptr_cb, s->uvlinesize,

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

             s->dsp.emulated_edge_mc(uvbuf + 16, ptr_cr, s->uvlinesize,

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

             ptr_cb= uvbuf;
             ptr_cr= uvbuf + 16;
         }
     }
 
     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 inline 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){
     int dxy, emu=0, src_x, src_y, offset;
     uint8_t *ptr;
 
     /* 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(s->flags&CODEC_FLAG_EMU_EDGE){
         if(   (unsigned)src_x > (s->h_edge_pos>>1) - (dxy &1) - 8
            || (unsigned)src_y > (s->v_edge_pos>>1) - (dxy>>1) - 8){

             s->dsp.emulated_edge_mc(s->edge_emu_buffer, ptr, 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->dsp.emulated_edge_mc(s->edge_emu_buffer, ptr, 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->dsp.prefetch(pix[0]+off, s->linesize, 4);
     off= (mx>>1) + ((my>>1) + (s->mb_x&7))*s->uvlinesize + 64;
     s->dsp.prefetch(pix[1]+off, pix[2]-pix[1], 2);
 }
 
 /**
  * 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 dxy, mx, my, src_x, src_y, motion_x, motion_y;
     int mb_x, mb_y, i;
     uint8_t *ptr, *dest;
 
     mb_x = s->mb_x;
     mb_y = s->mb_y;
 
     prefetch_motion(s, ref_picture, dir);
 

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

         int16_t mv_cache[4][4][2];
         const int xy= s->mb_x + s->mb_y*s->mb_stride;
         const int mot_stride= s->b8_stride;
         const int mot_xy= mb_x*2 + mb_y*2*mot_stride;
 
         assert(!s->mb_skipped);
 

         memcpy(mv_cache[1][1], s->current_picture.f.motion_val[0][mot_xy             ], sizeof(int16_t) * 4);
         memcpy(mv_cache[2][1], s->current_picture.f.motion_val[0][mot_xy + mot_stride], sizeof(int16_t) * 4);
         memcpy(mv_cache[3][1], s->current_picture.f.motion_val[0][mot_xy + mot_stride], sizeof(int16_t) * 4);

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

             memcpy(mv_cache[0][1], mv_cache[1][1], sizeof(int16_t)*4);
         }else{

             memcpy(mv_cache[0][1], s->current_picture.f.motion_val[0][mot_xy - mot_stride], sizeof(int16_t) * 4);

         }
 

         if (mb_x == 0 || IS_INTRA(s->current_picture.f.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], s->current_picture.f.motion_val[0][mot_xy - 1]);
             AV_COPY32(mv_cache[2][0], s->current_picture.f.motion_val[0][mot_xy - 1 + mot_stride]);

         }
 

         if (mb_x + 1 >= s->mb_width || IS_INTRA(s->current_picture.f.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], s->current_picture.f.motion_val[0][mot_xy + 2]);
             AV_COPY32(mv_cache[2][3], s->current_picture.f.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);
 
         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 == 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, 0, 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) {

         mx = 0;
         my = 0;
         if(s->quarter_sample){
             for(i=0;i<4;i++) {
                 motion_x = s->mv[dir][i][0];
                 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(s->flags&CODEC_FLAG_EMU_EDGE){
                     if(   (unsigned)src_x > s->h_edge_pos - (motion_x&3) - 8
                        || (unsigned)src_y > s->v_edge_pos - (motion_y&3) - 8 ){

                         s->dsp.emulated_edge_mc(s->edge_emu_buffer, ptr,

                                             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], 0, 0,
                             mb_x * 16 + (i & 1) * 8, mb_y * 16 + (i >>1) * 8,
                             s->width, s->height, s->linesize,
                             s->h_edge_pos, s->v_edge_pos,
                             8, 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);

     }

         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(s, dest_y, dest_cb, dest_cr,
                             1, 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(s, dest_y, dest_cb, dest_cr,
                             1, 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 = s->current_picture_ptr->f.data;

             }
 
             mpeg_motion(s, dest_y, dest_cb, dest_cr,
                         0, 0, 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){

                 ref2picture= ref_picture;
             }else{

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

             }
 
             mpeg_motion(s, dest_y, dest_cb, dest_cr,
                         0, 0, 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(s, dest_y, dest_cb, dest_cr,
                                 1, 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->dsp.avg_pixels_tab;
             }
         }else{
             for(i=0; i<2; i++){
                 mpeg_motion(s, dest_y, dest_cb, dest_cr,
                             0, 0, 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->dsp.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: assert(0);
     }
 }
 

 static inline void 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);
 }

 #endif /* AVCODEC_MPEGVIDEO_COMMON_H */