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Bug fix in motion vector limit calculation 

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
Родитель 034cea5e72
Коммит b748045470
4 изменённых файлов: 35 добавлений и 23 удалений
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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;

2
vp8/encoder/mcomp.h
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@ -22,7 +22,7 @@ extern void accum_mv_refs(MB_PREDICTION_MODE, const int near_mv_ref_cts[4]);
#define MAX_MVSEARCH_STEPS 8 // The maximum number of steps in a step search given the largest allowed initial step
#define MAX_FULL_PEL_VAL ((1 << (MAX_MVSEARCH_STEPS+3)) - 8) // Max full pel mv specified in 1/8 pel units
#define MAX_FULL_PEL_VAL ((1 << (MAX_MVSEARCH_STEPS)) - 1) // Max full pel mv specified in 1 pel units
#define MAX_FIRST_STEP (1 << (MAX_MVSEARCH_STEPS-1)) // Maximum size of the first step in full pel units
extern void print_mode_context(void);

20
vp8/encoder/pickinter.c
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@ -588,10 +588,10 @@ void vp8_pick_inter_mode(VP8_COMP *cpi, MACROBLOCK *x, int recon_yoffset,
/* adjust mvp to make sure it is within MV range */
vp8_clamp_mv(&mvp,
best_ref_mv.as_mv.col - MAX_FULL_PEL_VAL,
best_ref_mv.as_mv.col + MAX_FULL_PEL_VAL,
best_ref_mv.as_mv.row - MAX_FULL_PEL_VAL,
best_ref_mv.as_mv.row + MAX_FULL_PEL_VAL);
best_ref_mv.as_mv.col - (MAX_FULL_PEL_VAL<<3),
best_ref_mv.as_mv.col + (MAX_FULL_PEL_VAL<<3),
best_ref_mv.as_mv.row - (MAX_FULL_PEL_VAL<<3),
best_ref_mv.as_mv.row + (MAX_FULL_PEL_VAL<<3));
}
switch (this_mode)
@ -681,10 +681,14 @@ void vp8_pick_inter_mode(VP8_COMP *cpi, MACROBLOCK *x, int recon_yoffset,
mvp.as_int = best_ref_mv.as_int;
}
col_min = (best_ref_mv.as_mv.col - MAX_FULL_PEL_VAL) >>3;
col_max = (best_ref_mv.as_mv.col + MAX_FULL_PEL_VAL) >>3;
row_min = (best_ref_mv.as_mv.row - MAX_FULL_PEL_VAL) >>3;
row_max = (best_ref_mv.as_mv.row + MAX_FULL_PEL_VAL) >>3;
col_min = (best_ref_mv.as_mv.col < 0)?(-((abs(best_ref_mv.as_mv.col))>>3) - MAX_FULL_PEL_VAL)
:((best_ref_mv.as_mv.col>>3) - MAX_FULL_PEL_VAL);
col_max = (best_ref_mv.as_mv.col < 0)?(-((abs(best_ref_mv.as_mv.col))>>3) + MAX_FULL_PEL_VAL)
:((best_ref_mv.as_mv.col>>3) + MAX_FULL_PEL_VAL);
row_min = (best_ref_mv.as_mv.row < 0)?(-((abs(best_ref_mv.as_mv.row))>>3) - MAX_FULL_PEL_VAL)
:((best_ref_mv.as_mv.row>>3) - MAX_FULL_PEL_VAL);
row_max = (best_ref_mv.as_mv.row < 0)?(-((abs(best_ref_mv.as_mv.row))>>3) + MAX_FULL_PEL_VAL)
:((best_ref_mv.as_mv.row>>3) + MAX_FULL_PEL_VAL);
// Get intersection of UMV window and valid MV window to reduce # of checks in diamond search.
if (x->mv_col_min < col_min )

32
vp8/encoder/rdopt.c
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@ -1330,10 +1330,14 @@ static int vp8_rd_pick_best_mbsegmentation(VP8_COMP *cpi, MACROBLOCK *x,
if (bsi.segment_rd < best_rd)
{
int col_min = (best_ref_mv->as_mv.col - MAX_FULL_PEL_VAL) >>3;
int col_max = (best_ref_mv->as_mv.col + MAX_FULL_PEL_VAL) >>3;
int row_min = (best_ref_mv->as_mv.row - MAX_FULL_PEL_VAL) >>3;
int row_max = (best_ref_mv->as_mv.row + MAX_FULL_PEL_VAL) >>3;
int col_min = (best_ref_mv->as_mv.col < 0)?(-((abs(best_ref_mv->as_mv.col))>>3) - MAX_FULL_PEL_VAL)
:((best_ref_mv->as_mv.col>>3) - MAX_FULL_PEL_VAL);
int col_max = (best_ref_mv->as_mv.col < 0)?(-((abs(best_ref_mv->as_mv.col))>>3) + MAX_FULL_PEL_VAL)
:((best_ref_mv->as_mv.col>>3) + MAX_FULL_PEL_VAL);
int row_min = (best_ref_mv->as_mv.row < 0)?(-((abs(best_ref_mv->as_mv.row))>>3) - MAX_FULL_PEL_VAL)
:((best_ref_mv->as_mv.row>>3) - MAX_FULL_PEL_VAL);
int row_max = (best_ref_mv->as_mv.row < 0)?(-((abs(best_ref_mv->as_mv.row))>>3) + MAX_FULL_PEL_VAL)
:((best_ref_mv->as_mv.row>>3) + MAX_FULL_PEL_VAL);
int tmp_col_min = x->mv_col_min;
int tmp_col_max = x->mv_col_max;
@ -1876,10 +1880,10 @@ void vp8_rd_pick_inter_mode(VP8_COMP *cpi, MACROBLOCK *x, int recon_yoffset, int
/* adjust mvp to make sure it is within MV range */
vp8_clamp_mv(&mvp,
best_ref_mv.as_mv.col - MAX_FULL_PEL_VAL,
best_ref_mv.as_mv.col + MAX_FULL_PEL_VAL,
best_ref_mv.as_mv.row - MAX_FULL_PEL_VAL,
best_ref_mv.as_mv.row + MAX_FULL_PEL_VAL);
best_ref_mv.as_mv.col - (MAX_FULL_PEL_VAL<<3),
best_ref_mv.as_mv.col + (MAX_FULL_PEL_VAL<<3),
best_ref_mv.as_mv.row - (MAX_FULL_PEL_VAL<<3),
best_ref_mv.as_mv.row + (MAX_FULL_PEL_VAL<<3));
}
// Check to see if the testing frequency for this mode is at its max
@ -2011,10 +2015,14 @@ void vp8_rd_pick_inter_mode(VP8_COMP *cpi, MACROBLOCK *x, int recon_yoffset, int
int sadpb = x->sadperbit16;
int col_min = (best_ref_mv.as_mv.col - MAX_FULL_PEL_VAL) >>3;
int col_max = (best_ref_mv.as_mv.col + MAX_FULL_PEL_VAL) >>3;
int row_min = (best_ref_mv.as_mv.row - MAX_FULL_PEL_VAL) >>3;
int row_max = (best_ref_mv.as_mv.row + MAX_FULL_PEL_VAL) >>3;
int col_min = (best_ref_mv.as_mv.col < 0)?(-((abs(best_ref_mv.as_mv.col))>>3) - MAX_FULL_PEL_VAL)
:((best_ref_mv.as_mv.col>>3) - MAX_FULL_PEL_VAL);
int col_max = (best_ref_mv.as_mv.col < 0)?(-((abs(best_ref_mv.as_mv.col))>>3) + MAX_FULL_PEL_VAL)
:((best_ref_mv.as_mv.col>>3) + MAX_FULL_PEL_VAL);
int row_min = (best_ref_mv.as_mv.row < 0)?(-((abs(best_ref_mv.as_mv.row))>>3) - MAX_FULL_PEL_VAL)
:((best_ref_mv.as_mv.row>>3) - MAX_FULL_PEL_VAL);
int row_max = (best_ref_mv.as_mv.row < 0)?(-((abs(best_ref_mv.as_mv.row))>>3) + MAX_FULL_PEL_VAL)
:((best_ref_mv.as_mv.row>>3) + MAX_FULL_PEL_VAL);
int tmp_col_min = x->mv_col_min;
int tmp_col_max = x->mv_col_max;