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Bug fix in motion vector limit calculation

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Motion vector limits are calculated using right shifts, which
could give wrong results for negative numbers. James Berry's
test on one clip showed encoder produced some artifacts. This
change fixed that.

Change-Id: I035fc02280b10455b7f6eb388f7c2e33b796b018
This commit is contained in:
Yunqing Wang
2011-06-30 11:20:13 -04:00
parent 034cea5e72
commit b748045470
4 changed files with 35 additions and 23 deletions
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4
vp8/encoder/mcomp.c
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@@ -286,8 +286,8 @@ int vp8_find_best_sub_pixel_step_iteratively(MACROBLOCK *x, BLOCK *b, BLOCKD *d,
bestmv->as_mv.row = br << 1;
bestmv->as_mv.col = bc << 1;
if ((abs(bestmv->as_mv.col - ref_mv->as_mv.col) > MAX_FULL_PEL_VAL) ||
(abs(bestmv->as_mv.row - ref_mv->as_mv.row) > MAX_FULL_PEL_VAL))
if ((abs(bestmv->as_mv.col - ref_mv->as_mv.col) > (MAX_FULL_PEL_VAL<<3)) ||
(abs(bestmv->as_mv.row - ref_mv->as_mv.row) > (MAX_FULL_PEL_VAL<<3)))
return INT_MAX;
return besterr;