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authorwm4 <wm4@nowhere>2014-01-17 23:13:09 +0100
committerwm4 <wm4@nowhere>2014-01-17 23:21:17 +0100
commit92a9f11a0b4fda60c8880014be5920dcf3e95253 (patch)
tree790e1c362c0d23a12c03781c93183912f40edac3 /video
parent49ebbce3e049c7f8fba0c001d1e70994e2473eee (diff)
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sub: uglify sub decoder with locking
The plan is to make the whole OSD thread-safe, and we start with this. We just put locks on all entry points (fortunately, dec_sub.c and all sd_*.c decoders are very closed off, and only the entry points in dec_sub.h let you access it). I think this is pretty ugly, but at least it's very simple. There's a special case with sub_get_bitmaps(): this function returns pointers to decoder data (specifically, libass images). There's no way to synchronize this internally, so expose sub_lock/sub_unlock functions. To make things simpler, and especially because the lock is sort-of exposed to the outside world, make the locks recursive. Although the only case where this is actually needed (although trivial) is sub_set_extradata(). One corner case are ASS subtitles: for some reason, we keep a single ASS_Renderer instance for subtitles around (probably to avoid rescanning fonts with ordered chapters), and this ASS_Renderer instance is not synchronized. Also, demux_libass.c loads ASS_Track objects, which are directly passed to sd_ass.c. These things are not synchronized (and would be hard to synchronize), and basically we're out of luck. But I think for now, accesses happen reasonably serialized, so there is no actual problem yet, even if we start to access OSD from other threads.
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