Commit 3ada94ba authored by Benoit Fouet's avatar Benoit Fouet
Browse files

Description: split mpegvideo.c

Originally committed as revision 9467 to svn://svn.ffmpeg.org/ffmpeg/trunk
parent 82634fee
......@@ -67,6 +67,7 @@ OBJS-$(CONFIG_DVVIDEO_DECODER) += dv.o
OBJS-$(CONFIG_DVVIDEO_ENCODER) += dv.o
OBJS-$(CONFIG_DXA_DECODER) += dxa.o
OBJS-$(CONFIG_EIGHTBPS_DECODER) += 8bps.o
OBJS-$(CONFIG_ENCODERS) += mpegvideo_enc.o
OBJS-$(CONFIG_FFV1_DECODER) += ffv1.o golomb.o
OBJS-$(CONFIG_FFV1_ENCODER) += ffv1.o
OBJS-$(CONFIG_FFVHUFF_DECODER) += huffyuv.o
......
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/*
* The simplest mpeg encoder (well, it was the simplest!)
* Copyright (c) 2000,2001 Fabrice Bellard.
* Copyright (c) 2002-2004 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
*
* 4MV & hq & b-frame encoding stuff by Michael Niedermayer <michaelni@gmx.at>
*/
/**
* @file mpegvideo_common.h
* The simplest mpeg encoder (well, it was the simplest!).
*/
#ifndef MPEGVIDEO_COMMON_H
#define 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(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(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(!(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(!(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(!(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(!(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 chorma 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);
}