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avoid conditional and division in chroma MV calculation

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Originally committed as revision 23745 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Stefan Gehrer 2010-06-23 21:45:26 +00:00
parent 79aec75792
commit 8f910a5621
1 changed files with 2 additions and 2 deletions
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4
libavcodec/vp8.c
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@ -989,8 +989,8 @@ static void inter_predict(VP8Context *s, uint8_t *dst[3], VP8Macroblock *mb,
mb->bmv[ 2*y * 4 + 2*x+1].y +
mb->bmv[(2*y+1) * 4 + 2*x ].y +
mb->bmv[(2*y+1) * 4 + 2*x+1].y;
uvmv.x = (uvmv.x + (uvmv.x < 0 ? -2 : 2)) / 4;
uvmv.y = (uvmv.y + (uvmv.y < 0 ? -2 : 2)) / 4;
uvmv.x = (uvmv.x + 2 + (uvmv.x >> (INT_BIT-1))) >> 2;
uvmv.y = (uvmv.y + 2 + (uvmv.y >> (INT_BIT-1))) >> 2;
if (s->profile == 3) {
uvmv.x &= ~7;
uvmv.y &= ~7;