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added clamp for 2nd motion vector

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The commit added a clamp to the 2nd motion vector used in compound
prediction to insure mv within UMV borders. The clamp is similar to
that of the first motion vector except that No SPLITMV is ever used
for the 2nd motion vector.

Change-Id: I26dd63c304bd66b2e03a083749cc98c641667116
This commit is contained in:
Yaowu Xu 2012-03-13 10:26:53 -07:00
parent f85084a977
commit 8055ccf906
3 changed files with 17 additions and 3 deletions
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1
vp8/common/blockd.h
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@ -188,6 +188,7 @@ typedef struct
unsigned char partitioning;
unsigned char mb_skip_coeff; /* does this mb has coefficients at all, 1=no coefficients, 0=need decode tokens */
unsigned char need_to_clamp_mvs;
unsigned char need_to_clamp_secondmv;
unsigned char segment_id; /* Which set of segmentation parameters should be used for this MB */
// Flags used for prediction status of various bistream signals

16
vp8/common/reconinter.c
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@ -541,13 +541,25 @@ void vp8_build_2nd_inter16x16_predictors_mb(MACROBLOCKD *x,
unsigned char *ptr;
unsigned char *uptr, *vptr;
int mv_row = x->mode_info_context->mbmi.second_mv.as_mv.row;
int mv_col = x->mode_info_context->mbmi.second_mv.as_mv.col;
int_mv _16x16mv;
int mv_row;
int mv_col;
int omv_row, omv_col;
unsigned char *ptr_base = x->second_pre.y_buffer;
int pre_stride = x->block[0].pre_stride;
_16x16mv.as_int = x->mode_info_context->mbmi.second_mv.as_int;
if (x->mode_info_context->mbmi.need_to_clamp_secondmv)
{
clamp_mv_to_umv_border(&_16x16mv.as_mv, x);
}
mv_row = _16x16mv.as_mv.row;
mv_col = _16x16mv.as_mv.col;
ptr = ptr_base + (mv_row >> 3) * pre_stride + (mv_col >> 3);
if ((mv_row | mv_col) & 7)

3
vp8/decoder/decodemv.c
View File

@ -656,6 +656,7 @@ static void read_mb_modes_mv(VP8D_COMP *pbi, MODE_INFO *mi, MB_MODE_INFO *mbmi,
mb_to_top_edge -= LEFT_TOP_MARGIN;
mb_to_bottom_edge += RIGHT_BOTTOM_MARGIN;
mbmi->need_to_clamp_mvs = 0;
mbmi->need_to_clamp_secondmv = 0;
mbmi->second_ref_frame = 0;
/* Distance of Mb to the various image edges.
* These specified to 8th pel as they are always compared to MV values that are in 1/8th pel units
@ -894,7 +895,7 @@ static void read_mb_modes_mv(VP8D_COMP *pbi, MODE_INFO *mi, MB_MODE_INFO *mbmi,
read_mv(bc, &mbmi->second_mv.as_mv, (const MV_CONTEXT *) mvc);
mbmi->second_mv.as_mv.row += best_mv.as_mv.row;
mbmi->second_mv.as_mv.col += best_mv.as_mv.col;
mbmi->need_to_clamp_mvs |= vp8_check_mv_bounds(&mbmi->second_mv,
mbmi->need_to_clamp_secondmv = vp8_check_mv_bounds(&mbmi->second_mv,
mb_to_left_edge,
mb_to_right_edge,
mb_to_top_edge,