---
libavcodec/vc1dec.c | 20 ++++++++++++++------
1 files changed, 14 insertions(+), 6 deletions(-)
diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c
index be3da41..e389040 100644
--- a/libavcodec/vc1dec.c
+++ b/libavcodec/vc1dec.c
@@ -1422,29 +1422,36 @@ static av_always_inline int scaleforsame(VC1Context *v,
int i, int n /* MV */,
int dim, int dir)
{
int brfd, scalesame;
+ int hpel = 1 - v->s.quarter_sample;
+ n >>= hpel;
if (v->s.pict_type != AV_PICTURE_TYPE_B || v->second_field || !dir) {
if (dim)
- return scaleforsame_y(v, i, n, dir);
+ n = scaleforsame_y(v, i, n, dir) << hpel;
else
- return scaleforsame_x(v, n, dir);
+ n = scaleforsame_x(v, n, dir) << hpel;
+ return n;
}
brfd = FFMIN(v->brfd, 3);
scalesame = vc1_b_field_mvpred_scales[0][brfd];
- return n * scalesame >> 8;
+ n = (n * scalesame >> 8) << hpel;
+ return n;
}
static av_always_inline int scaleforopp(VC1Context *v, int n /* MV */,
int dim, int dir)
{
int refdist, scaleopp;
+ int hpel = 1 - v->s.quarter_sample;
+ n >>= hpel;
if (v->s.pict_type == AV_PICTURE_TYPE_B && !v->second_field && dir == 1) {
if (dim)
- return scaleforopp_y(v, n, dir);
+ n = scaleforopp_y(v, n, dir) << hpel;
else
- return scaleforopp_x(v, n);
+ n = scaleforopp_x(v, n) << hpel;
+ return n;
}
if (v->s.pict_type != AV_PICTURE_TYPE_B)
refdist = FFMIN(v->refdist, 3);
@@ -1452,7 +1459,8 @@ static av_always_inline int scaleforopp(VC1Context *v,
int n /* MV */,
refdist = dir ? v->brfd : v->frfd;
scaleopp = vc1_field_mvpred_scales[dir ^ v->second_field][0][refdist];
- return n * scaleopp >> 8;
+ n = (n * scaleopp >> 8) << hpel;
+ return n;
}
/** Predict and set motion vector
--
1.7.4.1
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