SMPTE ST 2064-2-2015 Audio to Video Synchronization Measurement - Fingerprint Transport.pdf

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1、 Approved October 9, 2015 Copyright 2015 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 3 Barker Avenue, White Plains, NY 10601 (914) 761-1100 Table of Contents Page Foreword . 2 Intellectual Property 2 Introduction 2 1 Scope . 3 2 Conformance Notation . 3 3 Normative References . 3 4 Ove

2、rview of Fingerprint Transport . 4 5 Mapping into Vertical Ancillary Data Packets 4 5.1 Format of Vertical Ancillary (VANC) Data Packets 4 6 Mapping into UDP / IP Packets 5 6.1 UDP Transport Considerations 5 6.2 UDP Transport Requirements 6 7 Mapping Into MPEG-2 Transport Stream 6 7.1 Constraints on

3、 Program-Specific Information (PSI) . 6 7.2 PES Encapsulation of Fingerprint Container . 6 Annex A Comments on the Preferred Location of VANC Packets (Informative) . 7 Annex B Bibliography (Informative) . 8 Page 1 of 8 pages SMPTE ST 2064-2:2015 SMPTE STANDARD Audio to Video Synchronization Measurem

4、ent Fingerprint Transport SMPTE ST 2064-2:2015 Page 2 of 8 pages Foreword The Society of Motion Picture and Television Engineers (SMPTE) is an internationally-recognized standards developing organization. Headquartered and incorporated in the United States of America, SMPTE has members in over 80 co

5、untries on six continents. SMPTEs Engineering Documents, including Standards, Recommended Practices, 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

6、 standards-developing organizations, including ISO, IEC and ITU. SMPTE Engineering Documents are drafted in accordance with the rules given in the Standards Operations Manual. SMPTE ST 2064-2 was prepared by Technology Committee 24TB. Intellectual Property SMPTE draws attention to the fact that it i

7、s claimed that compliance with this Standard may involve the use of one or more patents or other intellectual property rights (collectively, “IPR“). The Society takes no position concerning the evidence, validity, or scope of this IPR. Each holder of claimed IPR has assured the Society that it is wi

8、lling to License all IPR it owns, and any third party IPR it has the right to sublicense, that is essential to the implementation of this Standard to those (Members and non-Members alike) desiring to implement this Standard under reasonable terms and conditions, demonstrably free of discrimination.

9、Each holder of claimed IPR has filed a statement to such effect with SMPTE. Information may be obtained from the Director, Standards or that a certain course of action is preferred but not necessarily required; or that (in the negative form) a certain possibility or course of action is deprecated bu

10、t 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 not defined at this time, shall not be used, and may be defined in the future. The keyword “forbidden” indicates “reserve

11、d” 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 provisions (“shall“) and, if implemented, all recommended provisions (“should“) as described. A conformant implementation nee

12、d not implement optional provisions (“may“) and need not implement them as described. Unless otherwise specified, the order of precedence of the types of normative information in this document shall be as follows: Normative prose shall be the authoritative definition; Tables shall be next; followed

13、by formal languages; then figures; and then any other language forms. 3 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 subj

14、ect 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 indicated below. SMPTE ST 291-1:2011, Ancillary Data Packet and Space Formatting SMPTE ST 292-1:2012, 1.5 Gb/s Signal/Data Serial Inter

15、face SMPTE ST 2051:2014, Two-Frame Marker for 48(/1.001)-Hz, 50-Hz and 60(/1.001)-Hz Progressive Digital Video Signals on 1.5 Gb/s and 3 Gb/s Interfaces. SMPTE ST 2064-2:2015 Page 4 of 8 pages SMPTE ST 2064-1:2015, Audio to Video Synchronization Measurement Fingerprint Generation SMPTE RP 168:2009,

16、Definition of Vertical Interval Switching Point for Synchronous Video Switching IETF STD 5, RFC 791-1981, DARPA Internet Program Protocol Specification IETF STD 6, RFC 768-1980, User Datagram Protocol IETF RFC 2460-1998, Internet Protocol, Version 6 (IPv6) Specification ISO/IEC 13818-1:2007 (E), Int

17、ernational Standard, Information Technology Generic Coding of Moving Pictures and Associated Audio Information: Systems. 4 Overview of Fingerprint Transport Three methods of real-time transport are defined. The appropriate method should be selected for use as required in different parts of a system,

18、 depending upon system configuration and signal types. The audio and video fingerprint container is transport agnostic and may be carried unaltered through different concatenated transport methods. 5 Mapping into Vertical Ancillary Data Packets 5.1 Format of Vertical Ancillary (VANC) Data Packets Ea

19、ch ancillary data (ANC) packet shall comply with the format defined in SMPTE ST 291-1 for a type 2 ANC packet. It consists of the ancillary data flag (ADF), the data ID (DID), the secondary data ID (SDID), the data count (DC), the user data words (UDW), and the checksum (CS). The UDW consists of the

20、 data payload, in this case, the Fingerprint Container. The DID word shall be set to the value 41h. The SDID word shall be set to the value of 0Bh. DC is a count of the number of words in the UDW and shall be set to this word count. 5.1.1 UDW format The fingerprint container shall be carried in the

21、User Data Words of a SMPTE ST 291-1 ancillary data packet. The format of the fingerprint container is defined in the ”Container Structure” section of SMPTE ST 2064-1. The ANC packet UDW shall be a sequence of 10-bit words up to the length of the fingerprint container per ”Container Structure” sectio

22、n of SMPTE ST 2064-1. The fingerprint container information is transmitted in bits b7 through b0 of the 10-bit data word. Bit b8 is even parity for bits b7 through b0 of the 10-bit data word, and bit b9 equals the complement of bit b8. 5.1.2 Location of the Vertical Ancillary Data The fingerprint co

23、ntainer shall be located in the VANC space of every frame. For interlaced video systems, it shall be located in the first field. For progressive segmented frame systems, it shall be located in the first frame segment as defined in SMPTE ST 2051. In all cases, the fingerprint container shall be locat

24、ed on one line in the range from the second line after the line specified for switching, as defined in SMPTE RP 168, to the last line before active video, inclusive. Only one fingerprint container per interlaced, progressive or segmented frame shall be permitted at any point in the video chain. SMPT

25、E ST 2064-2:2015 Page 5 of 8 pages In order to maximize the time available for processing the active video with which the fingerprint is associated, it is recommended that the fingerprint container should be located early in the VANC period (see Annex A for further guidance). The fingerprint contain

26、er shall be carried in the VANC space of the frame following the frame from which the fingerprint container was generated. When the ANC packets defined in this standard are carried in a SMPTE ST 292-1 Interface, they shall be carried in the Luma (Y) data channel. Receiving equipment shall identify t

27、he fingerprint container on the basis of its DID and SDID fields. This is fundamental to the SMPTE ST 291-1 data concept, and all equipment intended to locate, identify, and/or process a fingerprint container shall comply with this requirement. The requirement is not intended to apply to equipment s

28、imply passing, switching, or recording the video signal, where the expectation is that the fingerprint containers are left unchanged wherever they are placed in the VANC space. Notes: 1. Nothing in this standard prohibits the carriage of multiple VANC packets containing different categories of data

29、on the same line in the VANC space. 2. For high definition signals, the packet location is constrained to the Y stream in order to ensure passage of this data through deployed devices that do not process VANC data in the C stream. 3. Designers should be aware that although this standard specifies th

30、e VANC data space as the location for the transport of information in an SD-SDI interface, there are legacy devices that will not pass this information if it is located on video lines where the V-bit (see SMPTE ST 125 and Recommendation ITU-R BT.656) is set to logical one. 6 Mapping into UDP / IP Pa

31、ckets The fingerprint container may be transmitted using the User Datagram Protocol (UDP) over IP networks using either IPv4 or IPv6 transport. The fingerprint container is transported according to RFC 768 in the user data space, beginning at octet 9 in the UDP message. Length and checksum in the UD

32、P message are calculated accordingly and populated prior to transmission. Each fingerprint UDP datagram shall contain only one fingerprint container. Additional data shall not be included in the datagram payload. 6.1 UDP Transport Considerations Each UDP/IP datagram sent by the transport layer shall

33、 completely adhere to the structure specified in the UDP Specification (RFC 768) and either the IPv4 (RFC 791) or IPv6 (RFC 2460), depending on which protocol is used. The UDP is a low-overhead, unreliable protocol. This section discusses reliability issues inherent in the protocol that implementers

34、 and users should be aware of. UDP does not provide any mechanism for the detection or correction of lost datagrams. Datagrams can be lost in transit due to congestion, corruption or any other intermittent network problem. The UDP/IP datagrams can become corrupted in transit due to software, hardwar

35、e or network errors. The checksums in UDP and IP do not provide a guarantee of corruption detection, and this transport mapping does not provide for a message acknowledgement or retransmission mechanism. The checksum in the fingerprint container may be used to further identify payloads with errors.

36、SMPTE ST 2064-2:2015 Page 6 of 8 pages 6.2 UDP Transport Requirements The IP Transport used by the UDP does not guarantee that the sequence of datagram delivery will match the order in which the datagrams are sent. The sequence counter in the fingerprint container should be used for sequence orderin

37、g management. 7 Mapping Into MPEG-2 Transport Stream 7.1 Constraints on Program-Specific Information (PSI) Fingerprint data is associated with a particular service and therefore is required to be an element of that particular program. Therefore, for each service with fingerprint data, the Program Ma

38、p Table (PMT) instance shall include a program element of stream type 06h, Packetized Elementary Stream (PES) packets containing private data. An associated RID of “LIPS”, (4Ch 49h 50h 53h) shall be used. 7.2 PES Encapsulation of Fingerprint Container For MPEG-2 Transport, the Fingerprint Container

39、(FC) shall be encapsulated in a PES packet, using private_stream_2 as specified in Table 1. 7.2.1 Fingerprint Container Transport Syntax Table 1 Bit Stream Syntax for the Fingerprint Container Transport PES packet 7.2.2 Fingerprint Data Transport Semantics packet_start_code_prefix The packet_start_c

40、ode_prefix is a 24-bit code. Together with the stream_id that follows it constitutes a packet start code that identifies the beginning of a packet. The packet_start_code_prefix is the bit string 0000 0000 0000 0000 0000 0001 (0x000001). stream_id This 8 bit field shall be set to the value BFh, indic

41、ating private_stream_2. PES_packet_length This 16-bit field specifies the number of bytes immediately following in the PES packet following the last byte of this field (including the CRC_32 field). fingerprint_container The fingerprint container defined in SMPTE ST 2064-1. CRC_32 This is a 32-bit fi

42、eld that contains the CRC value that ensures a zero output from the registers in the decoder defined in Annex A of ISO/IEC-13818-1 after processing the entire FC_transport packet. Syntax No. Bits Format FC_transport() packet_start_code_prefix 24 bslbf stream_id 8 BFh PES_packet_length 16 bslbf finge

43、rprint_container() var CRC_32 32 rpchof SMPTE ST 2064-2:2015 Page 7 of 8 pages Annex A Comments on the Preferred Location of VANC Packets (Informative) 1. Notwithstanding the possibility that the VANC packets may be placed on any line in the vertical ancillary space, it is desirable to further const

44、rain the location to a preferred line to improve the probability of successful passage through the production process. System designers should be aware that many devices in the studio processing chain will pass data on only a small subset of lines in the vertical ancillary space and some devices (e.

45、g., production switchers, digital video effects units, and video servers) may not pass VANC packets at all. For successful implementation of fingerprint, system designers need to understand the characteristics of all relevant devices and it is essential that the VANC location chosen for inserting fi

46、ngerprint containers takes into account downstream equipment in the video chain. 2. Some recording devices record only one line of data from the vertical ancillary space while others may record up to 11 lines. These recorders may select the lines that they record, or have other constraints. However,

47、 it is a common practice to set them to record three consecutive lines starting at the second line after the switching line. This typically constrains the available lines to the second line, the third line, and the fourth line after the switching line. 3. In Section 5.1.2 of this standard, it is rec

48、ommended that the fingerprint containers be located early in the VANC period. Regardless of the line on which the fingerprint container is placed, SMPTE ST 291-1 compliant ANC data receivers will detect the packet by its DID and SDID. 4. Fingerprint containers are preferably embedded in the video si

49、gnal early in the production process, ideally in the camera or image-generating device. It has been observed that some devices handling video signals do not test for existing ANC packets and consequently overwrite them. If such devices are present downstream of a fingerprint originating or processing device, it is possible that ANC data, including fingerprint data, could be deleted. 5. These considerations are similar to those for other data services carried in VANC. SMPTE ST 2064-2:2015 Page 8 of 8 pages Annex B Bibliography (Informative) S