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Each subtitle track gets its own decoder instance (sd_ass). But they use a shared ASS_Renderer. This is done mainly because of fontconfig. Initializing fontconfig is very slow when using it with memory fonts, so there's a practical need to cache this memory font state, which is done by not creating separate ASS_Renderers. This is very dirty and very evil, but we probably can't get rid of it any time soon. The shared ASS_Renderer was not properly synchronized. While the program logic guarantees that only one sd_ass instance is visible at a time, there are other interactions that require synchronization. In particular, I suspect concurrent execution of mp_ass_configure_fonts() and sd_ass.get_bitmaps cause issues in a newer libass development branch. So here's a shitty hack that hopefully fixes things, hopefully only until libass becomes less dependent on fontconfig. |
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|---|---|---|
| .. | ||
| ass_mp.c | ||
| ass_mp.h | ||
| dec_sub.c | ||
| dec_sub.h | ||
| draw_bmp.c | ||
| draw_bmp.h | ||
| find_subfiles.c | ||
| find_subfiles.h | ||
| img_convert.c | ||
| img_convert.h | ||
| osd_dummy.c | ||
| osd_font.otf | ||
| osd_libass.c | ||
| osd_state.h | ||
| osd.c | ||
| osd.h | ||
| sd_ass.c | ||
| sd_lavc_conv.c | ||
| sd_lavc.c | ||
| sd_lavf_srt.c | ||
| sd_microdvd.c | ||
| sd_movtext.c | ||
| sd_srt.c | ||
| sd.h | ||