ITU-T H 762-2009 Lightweight interactive multimedia environment (LIME) for IPTV services (Study Group 16)《网络电视(IPTV)业务的轻量级交互多媒体环境(LIME)》.pdf

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1、 International Telecommunication Union ITU-T H.762TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (12/2009) SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMSIPTV multimedia services and applications for IPTV IPTV multimedia application frameworks Lightweight interactive multimedia environment (LIME) for

2、IPTV services Recommendation ITU-T H.762 ITU-T H-SERIES RECOMMENDATIONS AUDIOVISUAL AND MULTIMEDIA SYSTEMS CHARACTERISTICS OF VISUAL TELEPHONE SYSTEMS H.100H.199 INFRASTRUCTURE OF AUDIOVISUAL SERVICES General H.200H.219 Transmission multiplexing and synchronization H.220H.229 Systems aspects H.230H.

3、239 Communication procedures H.240H.259 Coding of moving video H.260H.279 Related systems aspects H.280H.299 Systems and terminal equipment for audiovisual services H.300H.349 Directory services architecture for audiovisual and multimedia services H.350H.359 Quality of service architecture for audio

4、visual and multimedia services H.360H.369 Supplementary services for multimedia H.450H.499 MOBILITY AND COLLABORATION PROCEDURES Overview of Mobility and Collaboration, definitions, protocols and procedures H.500H.509 Mobility for H-Series multimedia systems and services H.510H.519 Mobile multimedia

5、 collaboration applications and services H.520H.529 Security for mobile multimedia systems and services H.530H.539 Security for mobile multimedia collaboration applications and services H.540H.549 Mobility interworking procedures H.550H.559 Mobile multimedia collaboration inter-working procedures H.

6、560H.569 BROADBAND, TRIPLE-PLAY AND ADVANCED MULTIMEDIA SERVICES Broadband multimedia services over VDSL H.610H.619 Advanced multimedia services and applications H.620H.629 IPTV MULTIMEDIA SERVICES AND APPLICATIONS FOR IPTV General aspects H.700H.719 IPTV terminal devices H.720H.729 IPTV middleware

7、H.730H.739 IPTV application event handling H.740H.749 IPTV metadata H.750H.759 IPTV multimedia application frameworks H.760H.769IPTV service discovery up to consumption H.770H.779 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T H.762 (12/2009) i Recommendation ITU-

8、T H.762 Lightweight interactive multimedia environment (LIME) for IPTV services Summary Recommendation ITU-T H.762 describes the high-level functionalities of the lightweight interactive multimedia environment (LIME) for IPTV. LIME supports functionalities in IPTV terminal devices to provide interac

9、tivity and a variety of content such as audio, video, graphics and text. Expected services include additional data such as text to enrich television programmes, and two-way portal pages. This Recommendation describes the profile called “LIME-HTML“ of W3C Recommendation XHTML 1.0, the profile called

10、“LIME-CSS“ of cascading style sheets 1 (CSS1), and a part of CSS2, the profile of document object model (DOM) called “LIME-DOM“, and a script language called “LIME-Script“ that is a subset of ECMAScript but has functional extensions required for IPTV services. It describes the use of IP-based protoc

11、ols for transport of LIME and IPTV-related services. History Edition Recommendation Approval Study Group 1.0 ITU-T H.762 2009-12-14 16 Keywords Application multimedia framework, character encoding, CSS, delivery protocol, DOM, ECMA script, HTML, metadata, monomedia, multimedia coding, XML. ii Rec. I

12、TU-T H.762 (12/2009) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is

13、 responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by

14、 the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a colla

15、borative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certa

16、in mandatory provisions (to ensure e.g., interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requireme

17、nts. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. I

18、TU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual

19、 property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2010 All rights res

20、erved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T H.762 (12/2009) iii CONTENTS Page 1 Scope 1 2 References. 1 3 Definitions 2 3.1 Terms defined elsewhere 2 3.2 Terms defined in this Recommendation . 3 4 Abbreviation

21、s and acronyms 3 5 Conventions 4 6 Overview 4 7 LIME-HTML 5 7.1 LIME-HTML document . 5 7.2 Display control of LIME 16 8 Use of LIME-CSS in LIME 17 9 Use of LIME-Script 19 9.1 Profile of built-in objects 19 9.2 Extensions to ECMAScript 24 10 Use of DOM in LIME. 26 10.1 DOM HTML interface group . 28 1

22、0.2 DOM interface specific to LIME-DOM . 32 10.3 Interface for LIME interrupt event . 36 10.4 BMLCSS2 properties interface for LIME-DOM . 38 11 Specific functions for IPTV services 40 11.1 Licensing 40 11.2 Content initialization 40 11.3 Service registration . 40 11.4 Communication of license inform

23、ation 40 11.5 Page-transition control 40 11.6 Control of display . 41 11.7 Parental control function 41 11.8 Use of URI 41 12 Transport of LIME document and related issues 41 12.1 Use of HTTP/1.1 41 12.2 Supported HTTP request headers . 42 12.3 Persistent connections 43 12.4 User-Agent . 44 12.5 Sup

24、ported HTTP response headers 44 12.6 Cookies . 45 iv Rec. ITU-T H.762 (12/2009) Page Annex A LIME-HTML versions 47 Annex B Multimedia resources. 48 B.1 Use of monomedia 48 Annex C Character encoding and font specification 49 C.1 Character specifications 49 C.2 Font specifications 50 Annex D Data typ

25、e definition (DTD) for LIME-HTML 51 Appendix I Browser functions for LIME 55 I.1 Video and graphics display 55 I.2 Audio playback . 56 I.3 Remote controller . 57 I.4 Key masks 57 I.5 Character entry function . 57 Appendix II An example of a LIME document 58 Appendix III Implementation example of LIM

26、E-Script . 59 III.1 Implementation example of LIME-Script 59 III.2 Operational general rule of implementation-dependent behaviour 60 III.3 Main syntax 60 III.4 Host object 60 III.5 Built-in object . 61 III.6 Implementation of event handler 61 Appendix IV Example of user-agent information . 62 Biblio

27、graphy. 63 Rec. ITU-T H.762 (12/2009) 1 Recommendation ITU-T H.762 Lightweight interactive multimedia environment (LIME) for IPTV services 1 Scope This Recommendation describes the high-level functionalities of the lightweight interactive multimedia framework (LIME) for IPTV. LIME supports functiona

28、lities in IPTV terminal devices to provide interactivity and a variety of content such as audio, video, graphics and text. Expected services include additional data such as text to enrich TV programmes, and two-way portal pages. This Recommendation describes the profile (called “LIME-HTML“) of XHTML

29、1.0 b-W3C XHTML, the profile (called “LIME-CSS“) of cascading style sheets 1(CSS1), and a part of CSS2, the profile of document object model (DOM) (called “LIME-DOM“), and a script language (called “LIME-Script“) that is a subset of ECMAScript but has functional extensions required for IPTV services

30、. It describes the use of IP-based protocols for transport of LIME and IPTV-related services. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the

31、editions indicated were valid. All Recommendations and other references are subject to revision; users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently

32、valid ITU-T Recommendations is regularly published. The reference to a document within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. ITU-T H.262 Recommendation ITU-T H.262 (2000) | ISO/IEC 13818-2:2000, Information technology Generic coding of movin

33、g pictures and associated audio information: Video. ITU-T H.264 Recommendation ITU-T H.264 (2007), Advanced video coding for generic audiovisual services. ITU-T H.720 Recommendation ITU-T H.720 (2008), Overview of IPTV terminal devices and end system. ITU-T H.721 Recommendation ITU-T H.721 (2009), I

34、PTV terminal devices: Basic mode. ITU-T H.760 Recommendation ITU-T H.760 (2009), Overview of multimedia application frameworks for IPTV services. ITU-T H.761 Recommendation ITU-T H.761 (2009), Nested context language (NCL) and Ginga-NCL for IPTV services. ITU-T T.81 Recommendation ITU-T T.81 (1992)

35、| ISO/IEC 10918-1:1994, Information technology Digital compression and coding of continuous-tone still images Requirements and guidelines. ISO/IEC 9899 ISO/IEC 9899:1999, Programming Languages-C. ISO/IEC 15948 ISO/IEC 15948:2004, Information technology Computer graphics and image processing Portable

36、 Network Graphics (PNG): Functional specification. 2 Rec. ITU-T H.762 (12/2009) ISO/IEC 11172-3 ISO/IEC 11172-3:1993, Information technology Coding of moving pictures and associated audio for digital storage media at up to about 1,5 Mbit/s Part 3: Audio. ISO/IEC 13818-7 ISO/IEC 13818-7:1997, Informa

37、tion Technology Generic Coding of Moving Pictures and Associated Audio Information Part 7: Advanced Audio Coding (AAC). IETF RFC 2616 IETF RFC 2616 (1999), Hypertext Transfer Protocol HTTP/1.1. IETF RFC 2965 IETF RFC 2965 (2000), HTTP State Management Mechanism. ARIB STD-B24 ARIB STD-B24 V.5.2 (2008

38、), Data coding and Transmission Specification for Digital Broadcasting. 3 Definitions 3.1 Terms defined elsewhere This Recommendation uses the following terms defined elsewhere: 3.1.1 application b-ITU-T Y.101: A functional implementation realized as software running in one or spread over several in

39、terplaying hardware entities. 3.1.2 broadcast markup language (BML) ARIB STD-B24: The XML application language specified in ARIB STD-B24 to be solely responsible for tags and attributes for multimedia representation. 3.1.3 ECMAScript b-ISO/IEC 16262: The programming language defined by b-ISO/IEC 162

40、62. 3.1.4 electronic programme guide (EPG) b-ITU-T Y.1901: A structured set of data, intended to provide information on available content that may be accessed by end-users. NOTE In some traditional broadcast services, EPG is defined as an on-screen guide used to display information on scheduled live

41、 broadcast television programmes, allowing a viewer to navigate, select and discover programmes by time, title, channel, genre. This traditional definition does not cover “catalogues“ for on-demand and download services (sometimes called electronic content guide (ECG) and broadband content guide (BC

42、G) and bidirectional interactive service (sometimes called interactive programme guide (IPG) for end-user interaction with a server or head-end. 3.1.5 Internet Protocol Television (IPTV) b-ITU-T Y.1901: Multimedia services such as television/video/audio/text/graphics/data delivered over IP-based net

43、works managed to support the required level of QoS/QoE, security, interactivity and reliability. 3.1.6 IPTV terminal device b-ITU-T Y.1901: A terminal device which has IPTV terminal function (ITF) functionality, e.g., a set-top box (STB). 3.1.7 IPTV terminal function (ITF) b-ITU-T Y.1901: The end-us

44、er function(s) associated with a) receiving and responding to network control channel messages regarding session set-up, maintenance, and tear-down, and b) receiving the content of an IP transport from the network and rendering. 3.1.8 video-on-demand (VoD) b-ITU-T Y.1901: A service in which the end-

45、user can, on demand, select and view a video content and where the end-user can control the temporal order in which the video content is viewed (e.g., the ability to start the viewing, pause, fast forward, rewind, etc.). NOTE The viewing may occur some time after the selection of the video content.

46、Rec. ITU-T H.762 (12/2009) 3 3.2 Terms defined in this Recommendation This Recommendation defines the following terms: 3.2.1 LIME-CSS: The profile of cascading style sheets (CSS) defined in this Recommendation that composes lightweight interactive multimedia environment (LIME). 3.2.2 LIME-DOM: The p

47、rofile of the document object model (DOM) defined in this Recommendation that composes lightweight interactive multimedia environment (LIME). 3.2.3 LIME-HTML: The profile of extensible hypertext markup language (XHTML) defined in this Recommendation that composes lightweight interactive multimedia e

48、nvironment (LIME). 3.2.4 LIME-Script: The subset of ECMAScript defined in this Recommendation that composes lightweight interactive multimedia environment (LIME). 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: AAC-LC Advanced Audio Coding Low Complexi

49、ty API Application Programming Interface BCG Broadband Content Guide BML Broadcast Markup Language CAS Conditional Access System CSS Cascading Style Sheets DOM Document Object Model DRM Digital Rights Management DTD Data Type Definition ECG Electronic Content Guide ECMA European Computer Manufacturers Association EPG Electronic Programme Guide ES Elementary Stream EUC-JP Extended UNIX Code Japanese GMT Greenwich Mean Time HTML Hyp