ACAP：ATSC的数字电视标准详解

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"ACAP-ATSC标准是Advanced Common Application Platform在数字电视领域的应用，由Advanced Television Systems Committee（ATSC）制定的一项国际性标准。ATSC是一个非营利组织，致力于协调不同通信媒体间的数字电视标准，包括互动系统和宽带多媒体通信。" ACAP（Advanced Common Application Platform）是一种高级通用应用程序平台，专门针对ATSC（Advanced Television Systems Committee）的数字电视标准设计。这个平台旨在提供一个统一的框架，使得开发者能够创建各种交互式电视应用和服务，增强观众的收视体验。ACAP标准的引入，让数字电视不仅能播放高质量的视频内容，还能支持游戏、购物、新闻、教育等多元化服务。 ATSC是一个由广播、广播设备、电影、消费电子、计算机、有线、卫星和半导体等行业代表组成的国际组织。成立于1982年，其目标是协调并制定数字电视的相关标准。ATSC的工作涵盖了从数字电视传输到互动系统和宽带多媒体通信的多个领域，确保这些标准在全球范围内的一致性和互操作性。文档A/101A是ATSC发布的关于ACAP的具体标准文档，该文档于2009年2月12日更新，详细规定了ACAP的技术规范和实现指南。这些规范可能包括应用程序的编程接口（APIs）、安全机制、用户界面设计、数据传输协议等方面的内容，以确保不同厂商的设备能够兼容ACAP应用。通过ATSC的努力，数字电视不仅仅是一个单向的信息传递工具，而是变成了一个互动平台，用户可以通过电视参与各种交互活动，享受更加丰富的视听体验。同时，ATSC还致力于推广这些标准，举办教育研讨会，帮助业界理解和实施相关技术。 ACAP标准的实施对于数字电视产业来说具有重要意义，它推动了电视行业的创新和发展，为消费者提供了更多样化、个性化的服务，同时也为制造商开辟了新的市场机会。随着技术的不断进步，ACAP标准可能会继续演进，以适应未来更高级别的交互性和多媒体需求。

Advanced Television Systems Committee Document A/101A

1.2 Application

The architecture and facilities of the ACAP Standard are intended to apply to broadcast systems

and receivers for terrestrial (over-the-air) broadcast and cable TV systems. In addition, the same

architecture and facilities may be applied to other transport systems (such as satellite).

2. REFERENCES

2.1 Normative References

The following standards and other references contain provisions, which through reference in this

document, constitute provisions of this standard. A simple statement that the content of the

reference document is a provision of this standard shall be an alternative form. At the time of

publication, the editions indicated were valid. All references are subject to revision; users of this

standard are therefore encouraged to investigate the possibility of applying the most recent edition

of the standards and other references listed below. References are either specific (identified by

date of publication and/or edition number or version number) or non-specific.

• For a specific reference, subsequent revisions shall not apply.

• For a non-specific reference, the latest version shall apply.

• A non-specific reference to an ETS shall also be taken to refer to later versions published

as an EN with the same number.

The following comments apply to particular sources of documents:

1) Where the reference is to an ISO specification, it is considered to be a “non-specific”

reference; additionally, officially published amendments and corrigenda are considered to

automatically update the referenced document.

2) References to RFCs are considered to be “specific references.” An RFC being indicated

obsoleted by another RFC is not considered significant.

3) ETSI specifications are available from the ETSI server at: http://www.etsi.org. However, the

ETSI server provides the current edition of the specification and in every case this standard

makes “specific” references which in the future may not be the current reference.

4) SCTE 90-1 is available from http://www.scte.org. (Informative note: The most recent version

of the CableLabs OCAP 1.0 specification is available from http://www.opencable.com/

specifications).

Note: The extent to which all or part of the following references are normative is

specified at the locations in the main body of this standard where they are used.

Listing a reference here does not imply that all of a reference is required.

[1] DVB: “Globally Executable MHP,” Version 1.0.3, available as ETSI TS 102 819 V 1.4.1,

Digital Video Broadcast Project, Geneva, Switzerland (see note #3 above).

[2] SCTE: “SCTE Application Platform Standard, OCAP 1.0 Profile,” doc. ANSI/SCTE 90-1

2005, Society of Cable Telecommunications Engineers, Exton, PA (see note #4 above).

[3] ISO: “Information Technology: Generic Coding of Moving Pictures and Associated Audio

Information: Systems,” Second Edition (2000), doc. ISO 13818-1, International

Organization for Standardization, Geneva, Switzerland.

Advanced Common Application Platform 12 February 2009

[4] ATSC: “DTV Application Software Environment, Part 1—Introduction, Architecture, and

Common Facilities,” doc. A/100-1, Advanced Television Systems Committee,

Washington, D.C., 9 March 2003.

[5] DVB: “Multimedia Home Platform,” Version 1.0.3, available as ETSI TS 101 812 V 1.3.1,

Digital Video Broadcast Project, Geneva, Switzerland (see note #3 above).

[6] ISO: “Information Technology: Generic Coding of Moving Pictures and Associated Audio

Information: Extensions for Digital Storage Media Command and Control,” First Edition

(1998), doc. ISO 13818-6, International Organization for Standardization, Geneva,

Switzerland.

[7] DVB: “Digital Video Broadcast Specification for Data Broadcasting,” Version 1.3.1, doc.

EN 301 192, Digital Video Broadcast Project, Geneva, Switzerland.

[8] SCTE: “Digital Cable Network Interface Standard,” doc. ANSI/SCTE 40, Society of

Cable Telecommunications Engineers, Exton, PA.

[9] IETF: “Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet

Message Bodies,” doc. RFC 2045, Internet Engineering Task Force, Reston, VA.

[10] ATSC: “Technology Group Report — ATSC Usage of the MPEG-2 Registration

Descriptor,” doc. T3-548, Advanced Television Systems Committee, Washington, D.C., 9

October 2001.

[11] ATSC: “Technology Group Report — Collision Avoidance for Private Fields and Ranges,”

doc. T3-549, Advanced Television Systems Committee, Washington, D.C., 9 October

2001.

[12] IETF: “ZLIB Compressed Data Format Specification,” Version 3.3,” doc. RFC 1950,

Internet Engineering Task Force, Reston, VA.

[13] IETF: “DEFLATE Compressed Data Format Specification,” Version 1.3, doc. RFC 1951,

Internet Engineering Task Force, Reston, VA.

[14] IETF: “Hypertext Transfer Protocol – HTTP/1.1,” doc. RFC 2616, Internet Engineering

Task Force, Reston, VA, June 1999.

[15] ATSC: “ATSC Interaction Channel Protocols,” doc. A/96, Advanced Television Systems

Committee, Washington, D.C., 3 February 2004.

[16] W3C: “Portable Network Graphics”, Version 1.0.1, World Wide Web Consortium,

Cambridge, MA.

[17] ISO: “Information technology – Coding of moving pictures and associated audio for

digital storage media at up to about 1.5 Mbits/s – Part 3: Audio,” doc. ISO/IEC 11172-3,

International Organization for Standardization, Geneva, Switzerland, 1993.

[18] DVB: “Implementation Guidelines for the use of MPEG-2 Systems,” Version 3.0, doc.

ETR 154, Digital Video Broadcast Project, Geneva, Switzerland.

[19] ATSC: “ATSC Digital Television Standard, Parts 1–6,” doc. A/53:2007, Advanced

Television Systems Committee, Washington, D.C., 3 January 2007.

Advanced Television Systems Committee Document A/101A

[20] SCTE: “Digital Video System Characteristics Standard for Cable Television,” doc. ANSI/

SCTE 43 2004, Society of Cable Telecommunications Engineers, Exton, PA.

[21] ATSC: “Digital Audio Compression (AC-3, E-AC3) Standard, Rev. B,” doc. A/52B,

Advanced Television Systems Committee, Washington, D.C., 14 June 2005.

[22] CEA: “Digital Television (DTV) Closed Captioning,” doc. CEA-708-D, Consumer

Electronics Assocation, Arlington, VA, August 2008.

[23] CEA: “Line 21 Data Services,” doc. CEA-706-E, Consumer Electronics Assocation,

Arlington, VA, April 2008.

[24] SCTE: “Method for Carriage of Closed Captions and Non-Real Time Sampled Video,”

doc. ANSI/SCTE 20 2004, Society of Cable Telecommunications Engineers, Exton, PA.

[25] SCTE: “Standard for Carriage of NTSC VBI Data in Cable Digital Transport Streams,”

doc. ANSI/SCTE 21 2001R2006, Society of Cable Telecommunications Engineers, Exton,

PA .

[26] CFR: “U.S. Code of Federal Regulations, Title 47, Part 15, Radio Frequency Devices,”

U.S. Government Printing Office, Washington, D.C., 20040.

[27] IEEE: “IEEE Standard for a High-Performance Serial Bus,” doc. IEEE 1394-2008,

Institute of Electrical and Electronics Engineers, Piscataway, NJ.

[28] ATSC: “Program and System Information Protocol for Terrestrial Broadcast and Cable,

Rev. C, with Amendment No. 1,” doc. A/65C, Advanced Television Systems Committee,

Washington, D.C., 2 January 2006 (Amendment No. 1 dated 9 May 2006).

[29] ATSC: “DTV Application Software Environment, Part 2—Declarative Applications and

Environments,” doc. A/100-2, Advanced Television Systems Committee, Washington,

D.C., 9 March 2003.

[30] DVB: “Multimedia Home Platform,” Version 1.1.1, available as ETSI TS 102 812 V1.2.1,

Digital Video Broadcast Project, Geneva, Switzerland (see note #3 above).

[31] ECMA: “ECMAScript Language Specification,” Third Edition, doc. ECMA-262, ECMA,

Geneva, Switzerland.

[32] W3C: “HTML 4.01 Specification,” Version 4.01, World Wide Web Consortium,

Cambridge, MA.

[33] W3C: “Cascading Style Sheets, Level 2,” World Wide Web Consortium, Cambridge, MA

(recommendation).

[34] W3C: “CSS TV Profile 1.0,” World Wide Web Consortium, Cambridge, MA (candidate

recommendation).

[35] W3C: “CSS3 Module: The Box Model,” World Wide Web Consortium, Cambridge, MA

(working draft).

[36] W3C: “CSS3 Module: Basic User Interface,” World Wide Web Consortium, Cambridge,

MA (working draft).

[37] W3C: “CSS3 Module: Color,” World Wide Web Consortium, Cambridge, MA (working

draft).

Advanced Common Application Platform 12 February 2009

[38] W3C: “Document Object Model (DOM) Level 2 Events,” World Wide Web Consortium,

Cambridge, MA (recommendation).

[39] DVB: “Digital Broadcasting Systems for Television, Sound, and Data Services: Allocation

of Service Information (SI) Codes for Digital Video Broadcasting (DVB) Systems,”

Version 1.0, doc. TR 101 162, Digital Video Broadcast Project, Geneva, Switzerland.

[40] ISO: “Information and documentation – International Standard Audiovisual Number

(ISAN),” doc. ISO 15706, International Organization for Standardization, Geneva,

Switzerland.

[41] ISO: “Information and documentation – Identifier for versions of audiovisual works (V-

ISAN) – Part 1: Format and use,” doc. ISO 20925-1, International Organization for

Standardization, Geneva, Switzerland (work in progress).

[42] ISO: “Generic coding of moving pictures and audio: Systems, Amendment 4: ISAN and

V-ISAN use in the content labeling descriptor,” doc. ISO/IEC 13818-1:2000/PDAM 4,

International Organization for Standardization, Geneva, Switzerland (work in progress).

[43] SCTE: “Service Information Delivered Out-Of-Band for Digital Cable Television,” doc.

ANSI/SCTE 65 2002, Society of Cable Telecommunications Engineers, Exton, PA.

[44] ATSC: “DTV Application Software Environment, Part 4—Applications Programming

Interface,” doc. A/100-4, Advanced Television Systems Committee, Washington, D.C., 9

March 2003.

[45] ATSC: “DTV Application Software Environment, Part 3—Procedural Applications and

Environment,” doc. A/100-3, Advanced Television Systems Committee, Washington,

D.C., 9 March 2003.

[46] CableLabs: “OpenCable Security Specification,” doc. OC-SP-SEC-I05-040831, Cable

Television Laboratories, Louisville, CO.

[47] IETF: “Uniform Resource Identifiers (URI): Generic Syntax,” RFC 2396, Internet

Engineering Task Force, Reston, VA.

[48] ISO: “Code for the Representation of Names of Languages: Part 1,” Version 1.0, doc. ISO

639.2, International Organization for Standardization, Geneva, Switzerland.

[49] SCTE: “Digital Video Service Multiplex and Transport System Standard for Cable

Television,” doc. ANSI/SCTE 54 2004, Society of Cable Telecommunications Engineers,

Exton, PA.

[50] DVB: “Specification for Service Information (SI) in DVB systems,” Edition 2, doc. ETS

300 468, Digital Video Broadcast Project, Geneva, Switzerland.

2.2 Informative References

The following standards and other references may provide valuable information to the reader, but

are not required when complying with this standard.

The following informative references apply to this standard.

[51] ATSC: “Transport Stream File System, doc. A/95, Advanced Television Systems

Committee, Washington, D.C., 25 February 2003.

Advanced Television Systems Committee Document A/101A

[52] CableLabs: “OpenCable Host Device 2.0 Core Functional Requirements,” doc. OC-SP-

HOST2.0-CFR-I06-050708, Cable Television Laboratories, Louisville, CO.

[53] ATSC: “Code Point Registry,” doc. TSG-575, Advanced Television Systems Committee,

Washington, D.C.

[54] DVB: “Globally Executable MHP, Annex C,” Version 1.0.2, available as ETSI TS 102 819

V 1.3.1, Digital Video Broadcast Project, Geneva, Switzerland (see note #3 above).

[55] TTA: “Standard for Terrestrial Data Broadcasting,” doc. TTAS.OT-07.0001/R3 Annex D,

Telecommunications Technology Association, Republic of Korea, 19 December 2008.

[56] IETF: “Transport Layer Security (TLS) Protocol,” doc. RFC 2246, Internet Engineering

Task Force, Reston, VA.

[57] ISO: “Information Technology: 8-Bit Single-Byte Coded Graphic Character Sets: Part 1:

Latin Alphabet No. 1,” Version 1.0, doc. ISO 8859-1, International Organization for

Standardization, Geneva, Switzerland.

[58] IETF: “Universal Resource Locators (URL),” doc. RFC 1738, Internet Engineering Task

Force, Reston, VA.

[59] ATSC: “DTV Application Software Environment, Part 8—Conformance,” doc. A/100-8,

Advanced Television Systems Committee, Washington, D.C., 9 March 2003.

[60] IETF: “Multimedia Internet Mail Extensions (MIME) Part Two: Media Types,” doc. RFC

2046, Internet Engineering Task Force, Reston, VA.

2.3 Reference Acquisition

2.3.1 ATSC Standards

Advanced Television Systems Committee (ATSC), 1776 K Street N.W., Suite 200 Washington,

DC 20006 USA; Phone: +1 202 872 9160; Fax: +1 202 872 9161; http://www.atsc.org/.

2.3.2 CableLabs Specifications

Cable Television Laboratories, Inc., 858 Coal Creek Circle, Louisville, CO 80027-9750, USA;

Phone: +1 303 661 9100; Fax: +1 303 661 9199; http://www.cablelabs.com.

2.3.3 CEA Standards

Consumer Electonics Association (CEA), 1919 S. Eads St., Arlington, VA 22202, USA; Phone:

+1 703 907 7625; Fax: +1 703 907 7693; http://www.ce.org.

2.3.4 DVB Standards

Digital Video Broadcast (DVB) Project, c/o European Broadcasting Union (EBU), 17a Ancienne

Route, CH-1218 Grand Saconnex, Geneva, Switzerland; Phone: +41 22 717 27 14; Fax: +41 22

717 27 27; http://www.dvb.org.

2.3.5 ECMA Standards

ECMA, 114, rue du Rhône, CH-1204 Geneva, Switzerland; Phone: +41 22 849 60 00; Fax: +41

22 849 60 01; http://www.ecma.ch/.

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