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Change bidir refine hash code so we only need to perform a single
hash calculation for the whole function. negligibly faster (about 0.1%) Originally committed as revision 22775 to svn://svn.ffmpeg.org/ffmpeg/trunk
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@ -1475,12 +1475,12 @@ static inline int bidir_refine(MpegEncContext * s, int mb_x, int mb_y)
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const int ymin= c->ymin<<shift;
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const int xmax= c->xmax<<shift;
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const int ymax= c->ymax<<shift;
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#define HASH(fx,fy,bx,by) ((fx)+17*(fy)+63*(bx)+117*(by))
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int hashidx= HASH(motion_fx,motion_fy, motion_bx, motion_by);
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uint8_t map[256];
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memset(map,0,sizeof(map));
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#define BIDIR_MAP(fx,fy,bx,by) \
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map[((motion_fx+fx)+17*(motion_fy+fy)+63*(motion_bx+bx)+117*(motion_by+by))&255]
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BIDIR_MAP(0,0,0,0) = 1;
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map[hashidx&255] = 1;
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fbmin= check_bidir_mv(s, motion_fx, motion_fy,
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motion_bx, motion_by,
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@ -1491,12 +1491,13 @@ static inline int bidir_refine(MpegEncContext * s, int mb_x, int mb_y)
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if(s->avctx->bidir_refine){
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int score, end;
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#define CHECK_BIDIR(fx,fy,bx,by)\
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if( !BIDIR_MAP(fx,fy,bx,by)\
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if( !map[(hashidx+HASH(fx,fy,bx,by))&255]\
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&&(fx<=0 || motion_fx+fx<=xmax) && (fy<=0 || motion_fy+fy<=ymax) && (bx<=0 || motion_bx+bx<=xmax) && (by<=0 || motion_by+by<=ymax)\
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&&(fx>=0 || motion_fx+fx>=xmin) && (fy>=0 || motion_fy+fy>=ymin) && (bx>=0 || motion_bx+bx>=xmin) && (by>=0 || motion_by+by>=ymin)){\
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BIDIR_MAP(fx,fy,bx,by) = 1;\
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map[(hashidx+HASH(fx,fy,bx,by))&255] = 1;\
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score= check_bidir_mv(s, motion_fx+fx, motion_fy+fy, motion_bx+bx, motion_by+by, pred_fx, pred_fy, pred_bx, pred_by, 0, 16);\
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if(score < fbmin){\
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hashidx += HASH(fx,fy,bx,by);\
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fbmin= score;\
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motion_fx+=fx;\
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motion_fy+=fy;\
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