[MPlayer-dev-eng] teletext_step_subpage

[Balázs Hámorszky]

I've made a little patch to make stepping between teletext subpages possible.
It's not perfect yet. It steps in hex numbers, but the subpages are
numbered bye dec.
When it steps back form 0 (which is never a valid subpage) ang get to
the maximum, than it can't step back.
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