1、SMPTE RECOMMENDED PRACTICE Transport of VBI Packet Data in Ancillary Data Packets RP 208-2002 Page 1 of 2 pages 1 Scope SMPTE 334M defines a method of carrying program-related data in ancillary data packets. In particular, it defines a packet named VBI data which is identified by the following combi
2、nation of data identifier (DID) and secondary data identifier (SDID): DID = 162h SDID = 203h This packet carnes data which can be used to produce a data signal in the vertical blanking interval (VBI) of a standard-definition video signal derived from the SMPTE 292M digital video stream. 2 Normative
3、references The following standards contain provisions which, through reference in this text, constitute provisions of this practice. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this practice are encouraged t
4、o investigate the possibility of applying the most recent edition of the standards indicated below. ANSVEIA 51 6-1 988, Joint EINCVCC Recommended Practice for Teletext: North American Basic Teletext Specification (NABTS) SMPTE 334M-2000, Television - Vertical Ancillary Data Mapping for Bit-Serial In
5、terface 3 Packet format Each VBI data ancillary packet contains the data required to produce the desired data waveform in exactly one VBI line. The format of this packet is as follows: Header: UDW: suffix: ADF (3 words) LINE (1 word CS (1 word) DID = 162h TYPE (1 word) SDID = 203h Data payload (vari
6、able) DC = vanable The LINE value at the start of the UDW represents the field number and VBI line where the data are intended to be carried. Bit b7 of LINE is the field number (O for field 2; 1 for field 1). Bits b6 and b5 are O. Bits b4-bO form a 5-bd unsigned integer which represents the offset (
7、in lines) of the data insertion line, relative to the base VBI frameline (line 9 of 525-line field 1, line 272 of 525-line field 2, line 5 of 625-line field 1 , line 31 8 of 625-line field 2). Copyright Q 2002 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. HaWe Ave., White Plains,
8、NY 10607 (914) 761-1100 Approved August 8,2002 RP 2-2002 3 1 AMOL) The TYPE field identifies the VBI data broadcast standard used to encode the data. The TYPE values and corresponding data count (DC) values are shown in table 1. This table contains some data formats which are in widespread use. This
9、 list is not exhaustive and can be augmented as required. 81 The 6 data bytes in the packet. I .I 1 ANSi/EIA 516 (NABTS) I 36 I 34 bytes, starting with the BS (byte sync) value. 1 I 2 I Guide Plus + I 6 I The 4 data bvtes in the packet. I 4 I AMOLII) I 14 I The 12 data bytes in the packet. ) Guide P
10、lus + is a trademark of Gemstar Development Corporation. 2, AMOL (automated measurement of lineups) is a trademark of Neiisen Media Research. Note that the data described in this standard may also be transported in KLV format according to SMPTE RP 21 4, or via other means. Annex A (informative) Bibliography SMPTE 292M-1998, Television - Bit-Serial Digital Interface for High-Definition Television Systems SMPTE RP 214-2002, Packing KLV Encoded Metadata and Data Essence into SMPTE 291M Ancillary Data Packets Page 2 of 2 pages
