Function called for each meta in buffer as a result of performing a
transformation on transbuf. Additional type specific transform data
is passed to the function as data.
Implementations should check the type of the transform and parse
additional type specific fields in data that should be used to update
the metadata on transbuf.
Function called for each
metainbufferas a result of performing a transformation ontransbuf. Additionaltypespecific transform data is passed to the function asdata.Implementations should check the
typeof the transform and parse additional type specific fields indatathat should be used to update the metadata ontransbuf.