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Reduce the size of the bidir refine hashtable from 4096 to 256 and

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change the hash function to something more sane and simple.
about 1/3 faster, no meassureable change in psnr or size and i gues
its even same md5 with my test file but i forgot testing that.

Originally committed as revision 22773 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer
2010-04-02 11:06:29 +00:00
parent e056d2a24b
commit 2d603902f3
1 changed files with 2 additions and 2 deletions
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4
libavcodec/motion_est.c
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@@ -1475,11 +1475,11 @@ static inline int bidir_refine(MpegEncContext * s, int mb_x, int mb_y)
const int ymin= c->ymin<<shift; const int ymin= c->ymin<<shift;
const int xmax= c->xmax<<shift; const int xmax= c->xmax<<shift;
const int ymax= c->ymax<<shift; const int ymax= c->ymax<<shift;
uint8_t map[8][8][8][8]; uint8_t map[256];
memset(map,0,sizeof(map)); memset(map,0,sizeof(map));
#define BIDIR_MAP(fx,fy,bx,by) \ #define BIDIR_MAP(fx,fy,bx,by) \
map[(motion_fx+fx)&7][(motion_fy+fy)&7][(motion_bx+bx)&7][(motion_by+by)&7] map[((motion_fx+fx)+17*(motion_fy+fy)+63*(motion_bx+bx)+117*(motion_by+by))&255]
BIDIR_MAP(0,0,0,0) = 1; BIDIR_MAP(0,0,0,0) = 1;
fbmin= check_bidir_mv(s, motion_fx, motion_fy, fbmin= check_bidir_mv(s, motion_fx, motion_fy,