SMPTE ST 2020-1-2014 Format of Audio Metadata and Description of the Asynchronous Serial Bitstream Transport.pdf
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1、 Copyright 2014 by THE SOCIETY OF MOTION PICTURE AND TELEVISION ENGINEERS 3 Barker Avenue, White Plains, NY 10601 (914) 761-1100 Approved August 16, 2014 F Table of Contents Page Foreword . 2 Intellectual Property 2 Introduction 2 1 Scope . 3 2 Conformance Notation . 3 3 Normative References . 3 4 D
2、efinitions and Acronyms 4 5 Serial Metadata Stream Structure and Timing on a Serial Data Link 4 5.1 Structure on an Asynchronous Serial Line 4 5.2 Metadata Frame Timing Requirements . 6 6 System Latency 7 7 Format of VANC Data Packets 7 7.1 SDID and Audio Channel Pair Number 7 8 Location of the Vert
3、ical Ancillary Data . 8 9 Levels of Operation 9 9.1 Support Levels . 9 9.2 Examples of Nomenclature 9 Annex A Bibliography (Informative) . 10 Annex B Comments on the Preferred Location of VANC Packets (Informative) . 11 Annex C Distinguishing Between Mapping Method A and Method B (Normative) 12 Anne
4、x D Asynchronous Serial Data Communication (Informative) . 13 Annex E Assigning SDID Values (Normative) 14 List of Figures Figure 1 Structure of a Metadata Frame in the Asynchronous Serial Stream . 5 Figure 2 Asynchronous Serial Metadata Stream Timing . 6 List of Tables Table 1 Association Between S
5、DID Values and the First Audio Channel Pair of an Audio Program . 8 Page 1 of 14 pages SMPTE ST 2020-1:2014 Revision of SMPTE 2020-1-2008 SMPTE STANDARD Format of Audio Metadata and Description of the Asynchronous Serial Bitstream Transport SMPTE ST 2020-1:2014 Page 2 of 14 pages Foreword SMPTE (the
6、 Society 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, Recomm
7、ended 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 standards-developing organizations, including ISO, IEC and ITU. SMPTE Engineering Do
8、cuments are drafted in accordance with the rules given in its Standards Operations Manual. SMPTE ST 2020-1 was prepared by Technology Committee 24TB. Intellectual Property At the time of publication no notice had been received by SMPTE claiming patent rights essential to the implementation of this E
9、ngineering Document. However, attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. SMPTE shall not be held responsible for identifying any or all such patent rights. Introduction This section is entirely informative and does not form a
10、n integral part of this document. Audio data-rate reduction technologies can use metadata, which is multiplexed into the encoded audio bitstream, to describe the encoded audio and convey information that precisely controls downstream encoders and decoders. Audio metadata is first created during prog
11、ram creation or mastering. It might need to be carried in the vertical ancillary data space of a digital television signal. There is no specific provision in this standard for ensuring that the relative timing between the video and its embedded VANC data is correct. The only timing relationship that
12、 exists is created when the data is embedded in the VANC. Once that relationship is established, the deterministic nature of the serial digital interface ensures that the relationship is preserved There are currently two methods of mapping the metadata into the vertical ancillary (VANC) data space.
13、The following suite of SMPTE Standards, define the basic characteristics of the audio metadata, its serial transport used to convey the metadata between devices, and both of the mappings into the VANC space. SMPTE ST 2020-1, Format of Audio Metadata and Description of the Asychronous Serial Bitstrea
14、m Transport SMPTE ST 2020-2, Vertical Ancillary Data Mapping of Audio Metadata Method A SMPTE ST 2020-3, Vertical Ancillary Data Mapping of Audio Metadata Method B SMPTE ST 2020-1:2014 Page 3 of 14 pages 1 Scope This Standard defines the basic structure and timing requirements of an asynchronous ser
15、ial audio metadata stream with respect to an associated video signal. These requirements apply to the serial metadata streams either present on asynchronous serial data communications links between devices or present in the vertical ancillary (VANC) data packets transported by the video signal. The
16、Standard also defines the Data ID (DID) and Secondary Data ID (SDID) values used to identify the VANC packets themselves and to associate the metadata in VANC packets with specific audio programs. This Standard defines levels of operation for two methods of mapping the metadata into ancillary data p
17、ackets. 2 Conformance Notation Normative text is text that describes elements of the design that are indispensable or contains 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,
18、changed, or added editorially without affecting interoperability. Informative text does not contain any conformance keywords. All text in this document is, by default, normative, except: the Introduction, any section explicitly labeled as “Informative“ or individual paragraphs that start with “Note:
19、” The keywords “shall“ and “shall not“ indicate requirements strictly to be followed 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
20、mentioning or excluding others; 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 but not prohibited. The keywords “may“ and “need not“ indicate courses of action permissible within the
21、 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 “reserved” and in addition indicates that the provision will never be defined in the future. A conformant imp
22、lementation according to this document is one that includes all mandatory provisions (“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 Ref
23、erences 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 subject to revision, and parties to agreements based on this standard are encouraged to i
24、nvestigate the possibility of applying the most recent edition of the standards indicated below. ANSI TIA/EIA-485-A 1998 (R 2003), Electrical Characteristics of Generators and Receivers for Use in Balanced Digital Multipoint Systems SMPTE ST 291-1:2011, Ancillary Data Packet and Space Formatting SMP
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