SMPTE ST 376M-2003 SMPTE STANDARD for Television - Mapping of Vertical Ancillary Data Packets (VANC) into VAUX DIF Blocks of DV-Based 25 Mb s or 50 Mb s Streams and Extended Video Mb .pdf
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1、 Table of contents 1 Scope 2 Normative references 3 General specifications 4 Mapping of vertical ancillary data packets 5 Extended video line data content 6 VAUX pack structures 7 Data mapping in a frame Annex A Abbreviations 1 Scope The purpose of this standard is to define a method to uniformly ma
2、p metadata and data essence present within vertical ancillary packets (VANC) on the serial digital Interface (SDI), into VAUX DIF blocks of a DV-based 25 Mb/s or 50 Mb/s stream. Additionally, the standard defines a mapping method that results in an increase of the video aperture by one video line (e
3、xtended video line) for the 25 Mb/s DV-based compression scheme. The VANC mapping is applicable to 525/60 and 625/50 signal formats that use the 25 Mb/s or 50 Mb/s DV-based compression system. The mapping of the extended video line is applicable only to the 25 Mb/s DV-based stream. This mapping proc
4、ess requires use of a 10-bit SDI interface for the incoming video signal. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are
5、subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. ANSI/SMPTE 259M-1997, Television 10-Bit 4:2:2 Component and 4fscComposite Digital Signals Serial Digital Interfac
6、e SMPTE 291M-1997, Television Ancillary Data Packet and Space Formatting SMPTE 314M-1999, Television Data Structure for DV-Based Audio, Data and Compressed Video 25 and 50 Mb/s Page 1 of 16 pages SMPTE 376M-2003 Copyright 2002 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdal
7、e Ave., White Plains, NY 10607 (914) 761-1100 Approved March 17, 2003 SMPTE STANDARD for Television Mapping of Vertical Ancillary Data Packets (VANC) into VAUX DIF Blocks of DV-Based 25 Mb/s or 50 Mb/s Streams and Extended Video Line Data into VAUX DIF Blocks of DV-Based 25 Mb/s Stream SMPTE 376M-20
8、03 Page 2 of 16 pages SMPTE 374M-2003, Television Mapping of Vertical Ancillary Data Packets and Extended Video Line Data into Video DIF Blocks of a DV-Based 50 Mb/s DIF Stream Structure SMPTE RP 168-2002, Definition of Vertical Switching Point for Synchronous Video Switching 3 General specification
9、s Metadata and data essence can be carried in the ancillary space of the serial digital interface (SDI), or serial data transport interface (SDTI) video stream structure. The data is formatted according to SMPTE 291M as vertical ancillary packets located in VBI space. VANC packets are mapped into th
10、e VAUX DIF data area of the 25 or 50 Mb/s DV-based DIF streams. During the mapping process, the VANC packets are converted into digital ancillary packets (DANC) and these are then mapped into VAUX DIF blocks, VAUX packs, as defined in SMPTE 314M. A line number generator is used to identify the posit
11、ion of the VANC packet on the SDI signal interface to prevent a possible temporal skew. NOTE Data content identification carried in a DIF frame that is defined in SMPTE 314M or IEC 61834 is located in the VSC and VS packs of the VAUX DIF blocks. Designers should be aware that data identification pre
12、sent in the VSC and VS packs of the SMPTE 314M DIF frame differs from data ID present in IEC 61834. The VSC and VS packs carry not only the data content ID of DV-based data (SMPTE 314M), but may also carry ID for DV data defined in IEC 61834. The mapping method proposed in this standard is based on
13、use of two different VAUX pack structures (see figure 3), 5-byte and 75-byte. SMPTE 314M and IEC 61834 specify only a single 5-byte long VAUX pack structure and they do not support the 75-byte VAUX pack structure. Some broadcast operations require a larger video aperture than that defined by the DV-
14、based compression system standard. The nominal video aperture of the compressed signal in DV-based compression is defined in SMPTE 314M and is equal to 480 lines in 525 TV line systems and 576 lines in 625 TV line systems. The extended video line video information mapping extends the range of the no
15、minal compressed video aperture by one line in both 525- and 625-line systems. The enlarged video aperture ads line 525 in the 525- line system and line 623 in the 625-line system. In addition, this method can be applied to a user selectable single line video signal. These lines are not processed by
16、 the DV-based compression system, and are therefore mapped into the VAUX DIF blocks of the compressed DV-based stream. This standard defines only a mapping of an extended video line into 25 Mb/s VAUX DIF blocks. Mapping of an extended video line into 50 Mb/s DIF video blocks is defined in SMPTE 374M
17、. Due to a fixed size of the bit space within the VAUX DIF blocks, it is necessary to establish management of the mapped space so maximum benefit of the VAUX DIF block space is achieved (see note 1) NOTE 1 Designers should be aware that the size of VANC data can exceed the capacity of the VAUX packs
18、. It is the responsibility of the application to manage the mapping of VANC data into VAUX packs such that only complete VANC packets are mapped into VAUX DIF blocks. Where the VAUX capacity is exceeded, it is the responsibility of the application to manage this mapping in such a way as to minimize
19、the effect on system performance, of not mapping all of the VANC data. Processing of data content located in VANC packets uses a technique of directly mapping it into VAUX DIF blocks. Data content contained in the extended video line, applies additional 4:2:2/4:1:1 sampling rate conversion before th
20、e content is mapped into the VAUX DIF blocks. The structure of this standard is as shown below: Clause 3.1 describes the data mapping space in the VAUX DIF block; Clause 4 describes the VANC data; Clause 5 describes extended video line data; Clause 6 describes VAUX pack structure; Clause 7 describes
21、 data mapping in a frame. SMPTE 376M-2003 Page 3 of 16 pages 3.1 Organization of the VAUX DIF block payload Figure 1 shows the typical organization of a DIF sequence for 25 and 50 Mb/s stream structures as described in SMPTE 314M. The VAUX DIF block space consists of three VAUX DIF blocks VA 0,i; VA
22、 1,i; and VA 2,i located in each DIF sequence. Conforming to SMPTE 314M, payload space of each VAUX DIF block is further subdivided into 15 VAUX packs and each VAUX pack is 5-byte long (see figure 3a). These 5-byte long VAUX packs are used in any VAUX DIF blocks, regardless of odd or even DIF sequen
23、ce. This standard defines, as well, a different VAUX DIF block payload structure space (see figure 3b) that is not defined in SMPTE 314M. This new structure is a 75-byte long VAUX pack. The reason for additional structures is to increase payload efficiency. The 75-byte long VAUX pack is used with VA
24、UX DIF blocks VA 0,i and VA 1,i of an even DIF sequence, and VAUX DIF blocks VA 1,i and VA 2,i of an odd DIF sequence (see note 2). A typical DIF sequence (odd or even) containing VAUX DIF blocks for data placement in both DIF sequences is shown in figure 2. VAUX DIF block VA 2,i in an even DIF sequ
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