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* demux_libass: do charset conversion by -subcpwm42013-06-251-3/+16
| | | | | | | | | | | | Old code used to use libass' recoding feature, which is a copy of the old MPlayer code. We dropped that a few commits ago. Unfortunately, this made it impossible to load some subtitle files, like UTF-16 files. Make .ass loading respect -subcp again. We do this by recoding the probe buffer to UTF-8, and then trying to load it normally. (Yep.) Since UTF-16 in particular will effectively half the probe buffer size, double the probe size.
* sub: add demux_libass wrapper, drop old hackswm42013-06-251-0/+108
demux_libass.c allows us to make subtitle format detection part of the normal file loading process. libass has no probe function, but trying to load the start of a file (the first 4 KB) is good enough. Hope that libass can even handle random binary input gracefully without printing stupid log messages, and that the libass parser doesn't accept too many non-ASS files as input. This doesn't handle the -subcp option correctly yet. This will be fixed later.