1、 ETSI TS 102 330 V1.1.1 (2004-06)Technical Specification Access and Terminals (AT);Portable Service Format (PSF)for Interactive Home DevicesETSI ETSI TS 102 330 V1.1.1 (2004-06) 2 Reference DTS/AT-040007 Keywords Broadband, IP ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.:
2、 +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Important notice Individual copies of the present document can be downloaded from: http:/www.etsi.org The present document may be made av
3、ailable in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF). In case of dispute, the reference shall be the printing on ETSI printers of the PDF version kept on
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5、 errors in the present document, send your comment to: editoretsi.org Copyright Notification No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2004. Al
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7、 and of the 3GPP Organizational Partners. ETSI ETSI TS 102 330 V1.1.1 (2004-06) 3 Contents Intellectual Property Rights5 Foreword.5 Introduction 5 1 Scope 6 2 References 6 3 Definitions and abbreviations.6 3.1 Definitions6 3.2 Abbreviations .7 4 Overview of a portable service format (informative).7
8、4.1 Background 7 4.2 Use of DDE-T for multi-platform services.9 4.2.1 Background.9 4.2.2 Standard UI design elements 11 4.2.3 Navigation control 11 4.2.4 Locator scheme independent of delivery mechanism .11 4.2.5 Synchronization mechanisms12 4.2.6 Secure access to network resources 12 4.2.7 Text, gr
9、aphics overlays, and transparency12 4.2.8 Video resizing and stream selection .12 4.2.9 Sound overlays13 4.2.10 Presentation of focus.13 4.2.11 Simple animation 13 4.2.12 Testing for the existence of resources.14 5 Portable service format.14 5.1 Markup support 14 5.1.1 Background (informative).14 5.
10、1.2 HTML mark-up 15 5.2 Style support.15 5.2.1 Background (informative).15 5.2.2 Style 15 5.3 Scripting elements 16 5.3.1 Background (informative).16 5.3.2 Scripting16 5.4 DOM support16 5.4.1 Background (informative).16 5.4.2 DOM.17 5.5 DDE-T host object support.17 5.5.1 Background (informative).17
11、5.5.2 Host object17 5.6 Media types 17 5.7 Locator support 17 5.7.1 Background (informative).17 5.7.2 Locators 17 5.8 Informative guidelines for multi-platform development 17 Annex A (informative): Sample code fragments19 A.1 Text, graphics overlays, and transparency .19 A.2 Stream selection and pre
12、sentation 20 A.3 Sound overlays .21 A.4 Typical element usage22 ETSI ETSI TS 102 330 V1.1.1 (2004-06) 4 A.5 Focus usage 23 A.6 Navigation 24 A.7 Animation.27 Annex B (informative): Sample views of Tic Tac Toe game on different target devices .28 B.1 Overview 28 B.2 Tic Tac Toe running on a personal
13、computer browser.29 B.3 Tic Tac Toe running on an a native set top box browser .30 B.4 Tic Tac Toe running on a PDA 31 B.5 Tic Tac Toe running on a mobile phone 32 Annex C (informative): Bibliography.33 History 34 ETSI ETSI TS 102 330 V1.1.1 (2004-06) 5 Intellectual Property Rights IPRs essential or
14、 potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or potentially Esse
15、ntial, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http:/webapp.etsi.org/IPR/home.asp). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI.
16、 No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This Technical Specification (TS) has been produced by ETSI Technical Committee Acce
17、ss and Terminals (AT). Introduction With the proliferation of information devices in the home, there is a growing need for content formats that can be used to author for multiple platforms. Based on both previous standards work and commercial experience, the present document describes the extended u
18、se of one such format with a range of home devices. ETSI ETSI TS 102 330 V1.1.1 (2004-06) 6 1 Scope The present document endorses Declarative Data Essence - Transitional DDE-T, an existing standardized portable format for interactive television, for use on a wider range of interactive home devices s
19、uch as home PCs and PDAs. The present document document also contains informative background on the capabilities of DDE-T, including representative examples of the sample code and figures illustrating the use of key elements. 2 References The following documents contain provisions which, through ref
20、erence in this text, constitute provisions of the present document. 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 do not apply. For a non-specific reference, the latest versio
21、n applies. Referenced documents which are not found to be publicly available in the expected location might be found at http:/docbox.etsi.org/Reference. 1 SMPTE 397M-2003: “Television - Declarative Data Essence - Transitional“. 2 IETF RFC 2616: “Hypertext Transfer Protocol - HTTP/1.1“. 3 IETF RFC 28
22、18: “HTTP Over TLS“. 4 ISO/IEC 10918-1 (1994): “Information technology - Digital compression and coding of continuous-tone still images: Requirements and guidelines“. NOTE: JPEG. 5 ISO/IEC 13818-3 (1998): “Information technology - Generic coding of moving pictures and associated audio information -
23、Part 3: Audio“. NOTE: MPEG. 6 ISO/IEC 13818-2 (2000): “Information technology - Generic coding of moving pictures and associated audio information: Video“. 7 W3C EC-png: “W3C Recommendation: PNG (Portable Network Graphics) Specification Version 1.0“. 8 IETF RFC 2838: “Uniform Resource Identifiers fo
24、r Television Broadcasts“. 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply: events: instantiation of asynchronous notifications from a client platform to the interactive television content LaTeX: document preparation
25、system service: sequence of programs under the control of a broadcaster which can be broadcast as part of a schedule stream: unidirectional continuous flow of content. Example: MPEG2 video ETSI ETSI TS 102 330 V1.1.1 (2004-06) 7 tuning: act of switching between two MPEG transport streams or multiple
26、xes user agent: process that interprets HTML documents 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: AO Arguments Object AV Audio-VisualCLUT Color LookUp Table CSS Cascading Style Sheets DDE-T Declarative Data Essence - Transitional DOM Document Objec
27、t Model ECMA European Computer Manufacturers Association HTML Hyper Text Mark-up Language HTTP Hyper Text Transport Protocol IETF Internet Engineering Task Force iTV interactive TeleVision JPEG Joint Picture Expert Group LaTeX Lamport TeX MO Math Object MPEG Motion Picture Expert Group PAL Phase Alt
28、ernate Line PC Personal ComputerPDA Personal Digital Assistant PDF Portable Document Format (Adobe) PNG Portable Network Graphics PSF Portable Service Format OSD On Screen Display SC Scope Chain SMPTE Society of Motion Picture and Television Engineers UI User Interface URI Uniform Resource Identifie
29、r URL Uniform Resource Locator VBScript Visual Basic Script W3C World Wide Web Consortium WWW World Wide Web 4 Overview of a portable service format (informative) 4.1 Background There is an increasing number of home devices such as PCs, interactive television receivers, PDAs that are capable of supp
30、orting some type of interactive experience via network connectivity. These devices offer consumers with more choices in how and when they access interactive services. Possible services that could span multiple devices include: AV content enhanced with interactive services. Information magazines. Int
31、eractive advertising. Gaming. eCommerce. Customer relationship management and customer care. ETSI ETSI TS 102 330 V1.1.1 (2004-06) 8 Messaging and communications. Simple content guides. eGovernment. Many of these devices, including PCs and PDAs now support some form of web-browser. Interactive telev
32、ision devices and browser-enable mobile phones are more challenging, as many have fewer resources than are available on a PC or PDA. Consequently, cross-platform delivery of these services presents a significant challenge for providers because of the diversity of these devices. Rewriting each servic
33、e for every platform may be straightforward when targeting similar devices e.g. only PCs or only PDAs. Multi-platform delivery becomes more difficult when addressing platforms with highly disparate capabilities. For example, while all PCs have a Web browser, PDAs often support only restricted browse
34、r functionality; low-end set top boxes, which are highly resource constrained, may not be able to support a browser at all. Thus, an authoring approach based on the availability of a full featured resident browser will not reach many potential home devices. A common approach for multi-platform autho
35、rs is to use some sort of meta-format to describe a service. A conversion process tied to the authoring environment is then applied to the service description to provide the final application for a particular platform. However, without the use of a common service description format, N authoring envi
36、ronments targeting M platforms leads to N x M conversion tools. A better solution is to have the N authoring environments provide services using a common exchange format, with each of the M target platforms realizing those services via a platform specific conversion step. This reduces the number of
37、conversion steps to of order N + M. The advantages of using a standard portable format for the exchange of information has been used before for various aspects of document processing in software such as LaTeX; it is also the idea behind Adobes Portable Data Format. Authors create documents in PDF fo
38、rmat and PDF readers are available on each format that convert and render the present document on each device. PDFDeveloperOnesContentPDFDeveloperTwosContentPDFDeveloperThreesContentPCPC ReaderLinuxLinux ReaderPDAPDA ReaderFigure 1: Content distribution using a portable document format A key feature
39、 of the portable document approach is that authors need not worry about the detailed capabilities of the target device(s). Instead, they describe their intended result in a platform independent way. Each target device is responsible for making a best effort to realize that intent within the limitati
40、ons of the device: images that are too large for a devices screen could be scaled or scrolled; color images may be rendered in black and white, or using a reduced color palette. One disadvantage of the “reader“ model is that it may not be implementable on all intended target devices - smaller footpr
41、int devices may be unable to support the minimum set of desired features. Rather than shrink the available feature set, a flexible approach to conversion is necessary to increase the reach of a Portable Service Format (PSF). ETSI ETSI TS 102 330 V1.1.1 (2004-06) 9 Larger footprint devices would cont
42、inue to use a reader model, implementing a PSF client to render the format on the target device. For less capable devices it is possible that an upstream server may perform the conversion of the content from the standard format to the target device format if the device is not capable of performing t
43、his conversion or a range of in-between scenarios. The key to flexible conversion is to have a format that specifies the intended user experience without over-specifying how that experience will be realized. PSFDeveloperContentPCPSF ClientSTBApp EnginePDAThin ClientCompileto AppNetworkOperatorUpstre
44、amServerNetworkOperatorOtherOther APIsConvertFigure 2: Flexible conversion example Figure 2 illustrates four different scenarios (although others are possible): Source conversion: the content developer converts from the portable format to a specific target before distribution. PDF-style: a client ca
45、pable of running on the target device directly converts the portable format to the target device format. Thin client: a network or service operator targeting devices on a specific network maps the portable format functionality onto a client server model, with the target device running a thin client.
46、 Network compiler: a network or service operator can use an upstream network server to compile the portable format into a native application for the target device. Flexible conversion can help to support a broader range of devices, network capabilities, and business models. 4.2 Use of DDE-T for mult
47、i-platform services 4.2.1 Background Whilst there is significant variation in platform capabilities between various devices, there are a number of elements that appear frequently in the user experience across devices: user-interface objects such as text, buttons, menus, and forms as well as images a
48、nd audio/visual streams. In particular, these elements include: Text, graphics overlays, possibly with some transparency control. Full screen video with some resizing facility. Sound overlays. Menus, buttons, focus control, links. Lists, forms, tables. ETSI ETSI TS 102 330 V1.1.1 (2004-06) 10 Compon
49、ent and stream selection. Simple animation. Synchronization of interactive content. Ability to test for the presence of return channel and other resources. Secure information exchange. Locator Scheme independent of delivery mechanism. A standard format that has these capabilities would be able to address the needs of a large number of these applications. HTML content for the World Wide Web represents a successful interactive content model: it provides both a relatively portable and familiar way to descr
