< The type of the metadata block; used determine which member of the * \a data union to dereference. If type >= FLAC__METADATA_TYPE_UNDEFINED * then \a data.unknown must be used.
See Implementation
< The type of the metadata block; used determine which member of the * \a data union to dereference. If type >= FLAC__METADATA_TYPE_UNDEFINED * then \a data.unknown must be used.