The TTML reader moved from roxmltree to craft-xml. This dev-only test checks
that both hand it the same elements, attributes and text, by namespace, on
TTML documents and on the writer's output. roxmltree becomes a dev-dependency,
which the cue ID tests use too.
Ported from the TTML commit of storytold/filmcraft#1839. A cue named s1 could
collide with the style ID, and a generated c1 could take the ID of a later cue.
Valid explicit IDs are reserved first; missing, invalid or repeated ones get a
replacement that is in no one's way. IDs are checked as XML NCNames.
Ported from storytold/filmcraft#2830. The writer treated every < with a later >
as a tag and wrote nothing for unknown names, so "1 < 2 and 3 > 2" lost its
middle. Only a well-formed tag is markup now; a > inside a quoted attribute
value does not end the tag.
Ported from storytold/filmcraft#4043 (filmcraft#4042). Each window load now
sends DeleteWindows before DefineWindow in place of the ClearWindows after it:
a window made anew is empty with the pen at its top left in any decoder, for
the same number of bytes, so cue timing is unchanged.
Ported from storytold/filmcraft#1837 (filmcraft#1791). A caption that closely
follows another popped on about a second late, because its load had to be one
unbroken run of free frames. Doubled codes stay adjacent; pauses are allowed
between them.
Ported from storytold/filmcraft#4467. A control character in cue text made the
exported file unreadable. The filter also covers U+FFFE and U+FFFF, which the
review of that pull request asked for.
Carved from FilmCraft's filmcraft-captions (crates/captions at 4bec22bd): the
file readers and writers, CEA-608/708 coding, format detection and the cue
document. Rendering and the mapping onto FilmCraft's caption tracks stay there.
- time: the crate has its own exact Tick (1/254016000000 s) and rational
FrameRate, the subset of filmcraft-time the formats use.
- TTML is read through craft-xml instead of roxmltree: no entity expansion,
nesting bounded by the reader (128 levels, as before).
- parse refuses input over 64 MiB and keeps at most 1,000,000 cues.
- MCC and EBU STL name the caller's program (WriteOptions::program).
- plain_text (inline tag stripping) moves with the SCC/MCC writers that need it.
Dylan M. Taylor