diff options
Diffstat (limited to 'DOCS')
| -rw-r--r-- | DOCS/tech-overview.txt | 32 |
1 files changed, 19 insertions, 13 deletions
diff --git a/DOCS/tech-overview.txt b/DOCS/tech-overview.txt index 2037ab653e..e242df1325 100644 --- a/DOCS/tech-overview.txt +++ b/DOCS/tech-overview.txt @@ -186,25 +186,31 @@ audio/out/: why buggy audio drivers can have a bad influence on playback quality. sub/: - Contains subtitle rendering, OSD rendering, and parts of subtitle loading. + Contains subtitle and OSD rendering. sub.c/.h is actually the OSD code. It queries dec_sub.c to retrieve decoded/rendered subtitles. osd_libass.c is the actual implementation of the OSD text renderer (which uses libass, and takes care of all the tricky fontconfig/freetype API usage and text layouting). - Subtitles are loaded either via libass (for .ass), subreader.c (the old - MPlayer subtitle loader code), or libavformat demuxers. The subtitles are - then passed to dec_sub.c and the subtitle decoders in sd_*.c. All text - subtitles are rendered by sd_ass.c. If text subtitles are not in the ASS - format, subtitle converters are inserted, for example sd_srt.c, which is - used to convert SRT->ASS. sd_srt.c is also used as general converter for - text->ASS (to prevent interpretation of text as ASS tags). - - subreader.c should eventually go away. It should be replaced by either - libavformat's demuxers, or by mpv native demuxers for more common formats - like SRT. See commit message of commit 92ae48d what needs to be done to - replace subreader.c completely and why. + Subtitle loading is now in demux/ instead. demux_libass.c wraps loading + .ass subtitles via libass. demux_lavf.c loads most subtitle types via + FFmpeg. demux_subreader.c is the old MPlayer code. It's used as last + fallback, or to handle some text subtitle types on Libav. (It also can + load UTF-16 encoded subtitles without requiring the use of -subcp.) + demux_subreader.c should eventually go away (maybe). + + The subtitles are passed to dec_sub.c and the subtitle decoders in sd_*.c + as they are demuxed. All text subtitles are rendered by sd_ass.c. If text + subtitles are not in the ASS format, subtitle converters are inserted, for + example sd_srt.c, which is used to convert SRT->ASS. sd_srt.c is also used + as general converter for text->ASS (to prevent interpretation of text as + ASS tags). + + Text subtitles can be preloaded, in which case they are read fully as soon + as the subtitle is selected, and then effectively stored in an ASS_Track. + It's used for external text subtitles, and required to make codepage + detection as well as timing postprocessing work. core/timeline/: A timeline is the abstraction used by mplayer.c to combine several files |