pub fn parse_declared_sections<'a, I>(
lines: &mut Peekable<I>,
header: &mut FrameHeader,
atom_data: &mut [AtomDatum],
) -> Result<(), ParseError>Expand description
Parses declared sections from a frame’s header metadata.
If header.sections is non-empty (v2 file with "sections" key in JSON),
parses each declared section in order. Otherwise falls back to legacy
blank-separator velocity detection.