SMPTE ST 2019-3-2008 VC-3 Type Data Stream Mapping over SDTI.pdf

1、 Copyright 2008 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 595 W. Hartsdale Ave., White Plains, NY 10607 (914) 761-1100 Approved January 15, 2008 Table of Contents Page Forward . 2 1 Scope 3 2 Conformance Notation 3 3 Normative References 3 4 Glossary of Acronyms, Terms and Data Types

2、 4 5 General Specifications (Informative) 4 6 Data Mapping in the SDTI Frame . 4 7 SDTI Header Data. 6 7.1 Location of the SDTI Header Data 6 7.2 Structure of the SDTI Header Data. 6 8 Payload Data. 6 8.1 Location of the VC-3 Type Stream Data. 7 8.2 Structure and Contents of the SDTI Payload Lines 7

3、 9 Audio Data 8 10 Ancillary Data 9 10.1 Location of Ancillary Data in Vertical Ancillary Region (VANC) 9 Annex A Bibliography (Informative) 10 Page 1 of 10 pages SMPTE 2019-3-2008SMPTE STANDARD VC-3 Type Data Stream Mapping over SDTI SMPTE 2019-3-2008 Page 2 of 10 pages Foreword SMPTE (the Society

4、of Motion Picture and Television Engineers) is an internationally-recognized standards developing organization. Headquartered and incorporated in the United States of America, SMPTE has members in over 80 countries on six continents. SMPTEs Engineering Documents, including Standards, Recommended Pra

5、ctices and Engineering Guidelines, are prepared by SMPTEs Technology Committees. Participation in these Committees is open to all with a bona fide interest in their work. SMPTE cooperates closely with other standards-developing organizations, including ISO, IEC and ITU. SMPTE Engineering Documents a

6、re drafted in accordance with the rules given in Part XIII of its Administrative Practices. SMPTE Standard 2019-3 was prepared by Technology Committee N26. SMPTE 2019-3-2008 Page 3 of 10 pages 1 Scope This document specifies the mapping of the VC-3 type compressed picture data stream into the SMPTE

7、305M SDTI payload area. The VC-3 type compressed picture data stream mapping is defined for source coded progressive 1080P picture rates of 25/P and 30/1.001/P, 720P picture rates of 50/P and 60/1.001/P, and for interlaced 1080I picture rates of 50/I and 60/1.001/I. VC-3 compression rates supported

8、with this mapping are limited to the payload capacity of the 270 Mbps SDTI and are listed inTable 4. For the transmission of compressed picture data coded at source picture rates of 25/P, 50/P and 50/I, the SDTI operates at a frame rate of 25Hz. For the transmission of compressed picture data coded

9、at source picture rates of 30/1.001/P, 60/1.001/P, and 60/1.001/I, the SDTI operates at a frame rate of 30/1.001 Hz. 2 Conformance Notation Documents consist of normative text and, optionally, informative text. Normative text is that describes elements of the design that are indispensable or contain

10、s the conformance language keywords: “shall“, “should“, or “may“. Informative text is text that is potentially helpful to the user, but not indispensable, and can be removed, changed, or added editorially without affecting interoperability. Informative text does not contain any conformance keywords.

11、 All text in this document is, by default, normative, except the Introduction, any section explicitly labelled as “Informative“ or individual paragraphs that start with “Note:” Normative references are external documents referenced in normative text that are indispensable to the user. Bibliographic

12、references are references made in informative text or are those otherwise not indispensable to the user. Normative references shall conform to the types and procedures specified in the Engineering Administrative Practices. The keywords “shall“ and “shall not“ indicate requirements strictly to be fol

13、lowed in order to conform to the document and from which no deviation is permitted. The keywords, “should“ and “should not“ indicate that, among several possibilities, one is recommended as particularly suitable, without mentioning or excluding others; or that a certain course of action is preferred

14、 but not necessarily required; or that (in the negative form) a certain possibility or course of action is deprecated but not prohibited. The keywords “may“ and “need not“ indicate courses of action permissible within the limits of the document. The keyword “reserved” indicates a provision that is n

15、ot defined at this time, shall not be used, and may be defined in the future. The keyword “forbidden” indicates “reserved” and in addition indicates that the provision will never be defined in the future. A conformant implementation according to this document is one that includes all mandatory provi

16、sions (“shall“) and, if implemented, all recommended provisions (“should“) as described. A conformant implementation need not implement optional provisions (“may“) and need not implement them as described. 3 Normative References The following standards contain provisions which, through reference in

17、this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent edition of the standards

18、 indicated below. SMPTE 272M-2004, Television Formatting AES/EBU Audio and Auxiliary Data into Digital Video Ancillary Data Space SMPTE 2019-3-2008 Page 4 of 10 pages SMPTE 291M-2006, Television Ancillary Data Packet and Space Formatting SMPTE 305M-2005, Television Serial Data Transport Interface (S

19、DTI) SMPTE 2019-1-2008, VC-3 Picture Compression and Data Stream Format 4 Glossary of Acronyms, Terms and Data Types The general definition of acronyms, terms and data types used in the SDTI is given in SMPTE 305M. These definitions are not repeated here to avoid any divergence of meaning. Definitio

20、ns of terms, abbreviations and symbols relating to VC-3 are given in SMPTE 2019-1. 5 General Specifications (Informative) This document specifies the mapping of VC-3 type data stream packets over SMPTE 305M (SDTI) at 270 Mbps with 1440 word/line payload. The VC-3 data stream comprises header data, e

21、ncoded picture data, and EOF end of frame signature. Since the VC-3 data stream does not include audio data, up to eight channels of 20 or 24-bit AES3 data are optionally mapped into the HANC space of the interface according to SMPTE 272M. Time code and other ancillary data packets conforming to SMP

22、TE 291M may also be mapped into unused HANC and VANC space. 6 Data Mapping in the SDTI Frame Figure 1 illustrates the location of VC-3 encoded data in the payload region, and the optional eight channels of 24-bit AES3 data mapped into the HANC space. Line numbering is shown for both 525 line and 625

23、 line (in parenthesis) SDTI formats. SMPTE 2019-3-2008 Page 5 of 10 pages Field 1Field 2SAVEAVVC-3Payload DataSDTIHANCHeaderEmbeddedAudioDataVC-3Payload Data23(26)234(237)286(339)497(550)108 bytes on last line108 bytes on last lineCRCdata type,flagEAVSAVSDTIHeaderDataAncillary (HANC)AudioGroup1(20bi

24、t)AudioGroup2(20bit)Ext. G1 Ext. G214401443144414961551156616211636Figure 1 SDTI Mapping SMPTE 2019-3-2008 Page 6 of 10 pages 7 SDTI Header Data 7.1 Location of the SDTI Header Data SDTI Header data shall be placed in HANC space and immediately following the EAV as specified by SMPTE 305M and as sho

25、wn in Figure 1. The header shall be present on lines 1525 except lines 10, 11, 273 and 274 of the 525 line standard, and lines 1-625 except lines 6, 7, 319 and 320 of the 625 line standard. 7.2 Structure of the SDTI Header Data The structure of the SDTI Header data shall conform to SMPTE 305M. Speci

26、fic SDTI header data fields required to identify parameters of this SDTI mapping include the code and AAI value, the block type, and the CRC flag. The correct values for these fields are listed in Table 1 below. Table 1 Required SDTI Header Data Fields for VC-3 Data Mapping SDTI Header Data Name Val

27、ue Description CODE and AAI 101h Payload:1440 words, AAI: Unspecified Block Type 101h Fixed block size of 1438 words without ECC CRC Flag 101h Payload CRC shall be inserted 8 Payload Data The mapping shall use 8-bit data blocks as defined in SMPTE 305M. The payload data, defined by SMPTE 2019-1, VC-

28、3 Picture Compression and Data Stream Format, is carried in the lower 8-bits (B7 through B0) of the 10-bit word. B8 shall be even parity for bits B7 through B0, and B9 shall be the complement of B8. According to SMPTE 2019-1, the VC-3 data stream comprises header, encoded compressed picture data, an

29、d EOF signature as shown in Figure 2. Figure 2 Compressed Frame Structure Compressed Frame Size = VC-3 Header Size + Target Byte Count + EOF Signature Size Compressed Frame Size is a multiple of 8KBytes (8192 bytes) The Header Size is 640 bytes. The EOF Signature Size is 4 bytes VC-3 Header Encoded

30、DataCompressedFrame PaddingEOF Signature Target Byte CountCompressed Frame SizeHeader SizeEOF Sig. SizeSMPTE 2019-3-2008 Page 7 of 10 pages 8.1 Location of the VC-3 Type Stream Data The VC-3 data stream shall be mapped into the payload space of the SDTI located as defined in Table 2 and shown in Fig

31、ure 1. Table 2 Location of Compressed Picture Data SDTI frame rate 30/1.001Hz 25Hz Total number of interface lines 525 625 Horizontal mapping location Samples 0 to 1439 Vertical mapping location First field: Second field: Lines 23 to 234 Lines 286 to 497 Lines 26 to 237 Lines 339 to 550 8.2 Structur

32、e and Contents of the SDTI Payload Lines The SDTI payload lines shall use the format defined in Table 3 and illustrated in Figure 3. Word location numbers are given as decimal numbers. Data values are given as hexadecimal numbers. Table 3 Contents of Compressed Picture Data Word No. Data name Value

33、Comment 0 Data type 271h Data type of VC-3 compressed data 1 User data 200h or 1FEh or 1FDh Valid data does not exist Valid data start line Valid data line 2 to 1437 User data data VC-3 compressed picture data 1438 Payload CRC 0 CRC0 Payload Cyclic Redundancy Code 1439 Payload CRC 1 CRC1 Payload Cyc

34、lic Redundancy Code Within each field containing VC-3 type stream data, the VC-3 type stream data shall start at the first line of the vertical mapping location defined in Table 2. This first payload line shall be identified with the valid data start line user data word. Decoders shall use the valid

35、 data start line user data word to detect the start of the VC-3 type stream data. SMPTE 2019-3-2008 Page 8 of 10 pages Payload data 1436 W x 212 lines 1stline SAV3FFh SAV 000h SAV 000h SAV XYZ Type 271h FLAG1FEh HD0 HD39CID3CID2CID1CID0HD44HD639D0D1D2D794D795CRC0 CRC1 EAV 3FFhEAV 000h EAV 000h EAV X

36、YZ 2 W Header data = 640 W 2 W Payload = 1440 W 2ndline SAV 3FFhSAV 000h SAV 000h SAV XYZ Type 271h FLAG1FDh D796D797 D2230D2231CRC0 CRC1 EAV 3FFhEAV 000h EAV 000h EAV XYZ 212thline SAV3FFh SAV 000h SAV 000h SAV XYZ Type 271h FLAG1FDh D302356D302357 D302459Dx60/EOF3Dx61/EOF2Dx62/EOF1Dx63/EOF0200h 20

37、0h 200h 200h 200h 200h 200h CRC0 CRC1EAV 3FFhEAV 000h EAV 000h EAV XYZ 2 W Last line data = 108 W EOF Sig Data in last 4 bytes for CID=1252d 2 W Figure 3 Payload Data Stream Structure For each field of the SDTI, VC-3 compressed picture data shall be mapped into the SDTI payload area on contiguous li

38、nes. The VC-3 header format is defined in the VC-3 compression standard SMPTE 2019-1. The 32-bit compression identification (CID) field located at bytes 40-43 (28h 2Bh) of the VC-3 header define the HD format and the size of the compressed data.The VC-3 compressed video formats supported by this SDT

39、I mapping definition are listed with CID values in Table 4. Table 4 Header Compression Identification (CID) of HD Format CID HD Format Compressed Frame Size (bytes) Picture Rates (Hz.) 1237d 1920x1080 Progressive 606,208 25, 30/1.001 1242d 1920x1080 Interlaced 606,208 50, 60/1.001 1252d 1280x720 Pro

40、gressive 303,104 50, 60/1.001 For 1080P and 1080I HD video formats, with decimal CIDs of 1237 and 1242 respectively, the frame rate shall be identical to the SDTI frame rate. The VC-3 compressed frame totals 606,208 bytes and is divided in two equal lengths. The first half (303,104 bytes) is mapped

41、into the first field of the SDTI payload, and the 2ndhalf mapped into the second field of the SDTI payload. For 720P HD formats (CID = 1252) of 50 and 60 Hz. frame rates equal to the SDTI field rate, one entire compressed frame totaling 303,104 bytes shall be carried on each SDTI field. 9 Audio Data

42、 AES3 audio data, if present, shall be mapped according to SMPTE 272M. The location of the audio packets shall immediately follow the SDTI header packet as illustrated in Figure 1. SMPTE 2019-3-2008 Page 9 of 10 pages 10 Ancillary Data Ancillary data packets may be used to map time code and other an

43、cillary data in both HANC and VANC regions. If present, the structure of the ancillary data packets shall conform to SMPTE 291M. HANC data packets shall be located in the available H-ANC space immediately following the last audio data packet. 10.1 Location of Ancillary Data in Vertical Ancillary Reg

44、ion (VANC) Table 5 VANC Ancillary Data Lines Frame rate 29.97Hz 25Hz Total lines 525 625 VANC lines Lines 12-22, 275-285 Lines 8-25, 321-338 The ancillary data flag ADF shall immediately follow SAV as specified in SMPTE 291M. SMPTE 2019-3-2008 Page 10 of 10 pages Annex A (Informative) Bibliography AES3-2003, Digital Audio Engineering Serial Transmission Format for Two-Channel Linearly Represented Digital Audio Data