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Correct chroma vector calculation for RealVideo 3.

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Old version divided it wrong, which resulted in chroma drift (visible on FATE
sample too as dirty trails left by clouds).

Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
This commit is contained in:
Kostya Shishkov 2011-08-02 13:45:28 +02:00 committed by Ronald S. Bultje
parent 73e8e8dbf9
commit 6f7fe4723b
2 changed files with 30 additions and 30 deletions
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4
libavcodec/rv34.c
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@ -737,8 +737,8 @@ static inline void rv34_mc(RV34DecContext *r, const int block_type,
my = (s->current_picture_ptr->f.motion_val[dir][mv_pos][1] + (3 << 24)) / 3 - (1 << 24);
lx = (s->current_picture_ptr->f.motion_val[dir][mv_pos][0] + (3 << 24)) % 3;
ly = (s->current_picture_ptr->f.motion_val[dir][mv_pos][1] + (3 << 24)) % 3;
chroma_mx = (s->current_picture_ptr->f.motion_val[dir][mv_pos][0] + 1) >> 1;
chroma_my = (s->current_picture_ptr->f.motion_val[dir][mv_pos][1] + 1) >> 1;
chroma_mx = s->current_picture_ptr->f.motion_val[dir][mv_pos][0] / 2;
chroma_my = s->current_picture_ptr->f.motion_val[dir][mv_pos][1] / 2;
umx = (chroma_mx + (3 << 24)) / 3 - (1 << 24);
umy = (chroma_my + (3 << 24)) / 3 - (1 << 24);
uvmx = chroma_coeffs[(chroma_mx + (3 << 24)) % 3];

56
tests/ref/fate/rv30
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