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vc1dec: take ME precision into account while scaling MV predictors. 

Signed-off-by: Anton Khirnov <anton@khirnov.net>
This commit is contained in:
shahriman AMS 2011-11-08 08:47:30 +00:00 committed by Anton Khirnov
parent 055a141e44
commit 6475a6e1ca
1 changed files with 14 additions and 6 deletions
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20
libavcodec/vc1dec.c
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@ -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