PeerStreamer

/*

 * 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 mpegvideo_common.h

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

 */

#ifndef FFMPEG_MPEGVIDEO_COMMON_H

#define FFMPEG_MPEGVIDEO_COMMON_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);

int dct_quantize_trellis_c(MpegEncContext *s, DCTELEM *block, int n, int qscale, int *overflow);

void  denoise_dct_c(MpegEncContext *s, DCTELEM *block);

void copy_picture(Picture *dst, Picture *src);

/**

 * 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){

            ff_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(ENABLE_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){

            ff_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){

        ff_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(ENABLE_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){

            ff_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;

}

/* 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)

{

    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.linesize[0] << field_based;

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

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

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

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

    if (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 = (s->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(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 = s->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 = (s->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(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\n");

                return ;

            }

            ff_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(!ENABLE_GRAY || !(s->flags&CODEC_FLAG_GRAY)){

                uint8_t *uvbuf= s->edge_emu_buffer+18*s->linesize;

                ff_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);

                ff_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(!ENABLE_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((ENABLE_H261_ENCODER || ENABLE_H261_DECODER) && s->out_format == FMT_H261){

        ff_h261_loop_filter(s);

    }

}

//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  ){

        ff_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(!ENABLE_GRAY || !(s->flags&CODEC_FLAG_GRAY)){

            uint8_t *uvbuf= s->edge_emu_buffer + 18*s->linesize;

            ff_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);

            ff_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(!ENABLE_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/2);

    if (src_x == s->width/2)

        dxy &= ~1;

    src_y = av_clip(src_y, -8, s->height/2);

    if (src_y == s->height/2)

        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){

            ff_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){

        ff_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 pic_op halfpel motion compensation function (average or put normally)

 * @param pic_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 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])

{

    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(s->obmc && s->pict_type != B_TYPE){

        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.motion_val[0][mot_xy           ], sizeof(int16_t)*4);

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

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

        if(mb_y==0 || IS_INTRA(s->current_picture.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.motion_val[0][mot_xy-mot_stride], sizeof(int16_t)*4);

        }

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

            *(int32_t*)mv_cache[1][0]= *(int32_t*)mv_cache[1][1];

            *(int32_t*)mv_cache[2][0]= *(int32_t*)mv_cache[2][1];

        }else{

            *(int32_t*)mv_cache[1][0]= *(int32_t*)s->current_picture.motion_val[0][mot_xy-1];

            *(int32_t*)mv_cache[2][0]= *(int32_t*)s->current_picture.motion_val[0][mot_xy-1+mot_stride];

        }

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

            *(int32_t*)mv_cache[1][3]= *(int32_t*)mv_cache[1][2];

            *(int32_t*)mv_cache[2][3]= *(int32_t*)mv_cache[2][2];

        }else{

            *(int32_t*)mv_cache[1][3]= *(int32_t*)s->current_picture.motion_val[0][mot_xy+2];

            *(int32_t*)mv_cache[2][3]= *(int32_t*)s->current_picture.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(!ENABLE_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(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(ENABLE_WMV2 && s->mspel){

            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);

        }

        break;

    case MV_TYPE_8X8:

        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 ){

                        ff_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(!ENABLE_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(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);

                /* 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);

            }

        } else {

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

                ref_picture= s->current_picture_ptr->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);

        }

        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 == B_TYPE || s->first_field){

                ref2picture= ref_picture;

            }else{

                ref2picture= s->current_picture_ptr->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);

            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);

                }

                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);

                // 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->data;

                }

            }

        }

    break;

    default: assert(0);

    }

}

#endif /* FFMPEG_MPEGVIDEO_COMMON_H */