diracdec: check that block length is valid

In init_planes p->xblen and p->yblen are set to:
            p->xblen = s->plane[0].xblen >> s->chroma_x_shift;
            p->yblen = s->plane[0].yblen >> s->chroma_y_shift;

These are later used as block_w and block_h arguments of
s->vdsp.emulated_edge_mc. If one of them is 0 it triggers an av_assert2
in emulated_edge_mc:
    av_assert2(start_x < end_x && block_w > 0);
    av_assert2(start_y < end_y && block_h > 0);

Signed-off-by: Andreas Cadhalpun <[email protected]>
Signed-off-by: Michael Niedermayer <[email protected]>
(cherry picked from commit 75fc81c8318505aa7946e05a9bee08d47241fc66)

Signed-off-by: Michael Niedermayer <[email protected]>

0 files changed, 0 insertions, 0 deletions