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vp9: fix mvref finding to adhere to bug in libvpx.

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Fixes a particular youtube video that I unfortunately can't share.

Signed-off-by: Anton Khirnov <anton@khirnov.net>
This commit is contained in:
Ronald S. Bultje 2014-01-19 19:04:58 +01:00 committed by Anton Khirnov
parent 2aec9e228c
commit bd01412313
1 changed files with 10 additions and 2 deletions
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12
libavcodec/vp9mvs.c
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@ -191,11 +191,15 @@ static void find_ref_mvs(VP9Context *s,
if (mv->ref[0] != ref && mv->ref[0] >= 0)
RETURN_SCALE_MV(mv->mv[0],
s->signbias[mv->ref[0]] != s->signbias[ref]);
if (mv->ref[1] != ref && mv->ref[1] >= 0)
if (mv->ref[1] != ref && mv->ref[1] >= 0 &&
// BUG - libvpx has this condition regardless of whether
// we used the first ref MV and pre-scaling
AV_RN32A(&mv->mv[0]) != AV_RN32A(&mv->mv[1])) {
RETURN_SCALE_MV(mv->mv[1],
s->signbias[mv->ref[1]] != s->signbias[ref]);
}
}
}
// MV at this position in previous frame, using different reference frame
if (s->use_last_frame_mvs) {
@ -204,10 +208,14 @@ static void find_ref_mvs(VP9Context *s,
if (mv->ref[0] != ref && mv->ref[0] >= 0)
RETURN_SCALE_MV(mv->mv[0],
s->signbias[mv->ref[0]] != s->signbias[ref]);
if (mv->ref[1] != ref && mv->ref[1] >= 0)
if (mv->ref[1] != ref && mv->ref[1] >= 0 &&
// BUG - libvpx has this condition regardless of whether
// we used the first ref MV and pre-scaling
AV_RN32A(&mv->mv[0]) != AV_RN32A(&mv->mv[1])) {
RETURN_SCALE_MV(mv->mv[1],
s->signbias[mv->ref[1]] != s->signbias[ref]);
}
}
AV_ZERO32(pmv);
#undef INVALID_MV