Video Ancillary data, according to SMPTE-291M specification.
Note that the contents of the data are always stored as 8bit data (i.e. do not contain the parity check bits).
The Data Identifier
The Secondary Data Identifier (if type 2) or the Data Block Number (if type 1)
The amount of data (in bytes) in @data (max 255 bytes)
Video Ancillary data, according to SMPTE-291M specification.
Note that the contents of the data are always stored as 8bit data (i.e. do not contain the parity check bits).