BS-ISO-IEC-14496-18-2004.pdf
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1、BRITISH STANDARD BS ISO/IEC 14496-18:2004 Information technology Coding of audio-visual objects Part 18: Font compression and streaming ICS 35.040 ? Licensed Copy: London South Bank University, London South Bank University, Tue Jan 23 07:42:20 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS ISO/IEC 14
2、496-18:2004 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 12 July 2004 BSI 12 July 2004 ISBN 0 580 44048 6 National foreword This British Standard reproduces verbatim ISO/IEC 14496-18:2004 and implements it as the UK national standard. The
3、UK participation in its preparation was entrusted to Technical Committee IST/37, Coding of picture, audio, multimedia and hypermedia information, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The B
4、ritish Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This
5、 publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible inter
6、national/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO/
7、IEC title page, pages ii to vi, pages 1 to 18, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: London South Bank University, London South B
8、ank University, Tue Jan 23 07:42:20 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Reference number ISO/IEC 14496-18:2004(E) NINRETOITALAN ADNATSDR ISO/IEC 1694481- tide tsriFino -400210-70 Information technology Coding of audio-visual objects Part 18: Font compression and streaming Technologies de linf
9、ormation Codage des objets audiovisuels Partie 18: Compression et transmission de polices de caractres Referecne unbmer OSICEI/ 9441:81-64002()E OSI4002 CEI/ INTERNATIONAL STANDARD ISO/IEC 14496-18 First edition 2004-07-01 rofnImitacet nolonhgoy Cidogn of idua-ovisujbo lastce :81 traP noFoc tmpisser
10、a nos dntimaergn Teclonhgosei ed lrofnimtai no doCega sed obejst aiduvosieusl raPtie 18oC :rpmession te trsnasimsion ed opcilse de caractrse BS ISO/IEC 1449618:2004 Licensed Copy: London South Bank University, London South Bank University, Tue Jan 23 07:42:20 GMT+00:00 2007, Uncontrolled Copy, (c) B
11、SI ii BS ISO/IEC 1449618:2004 Licensed Copy: London South Bank University, London South Bank University, Tue Jan 23 07:42:20 GMT+00:00 2007, Uncontrolled Copy, (c) BSI iii Contents Page Forewordiv Introduction .vi 1 Scope1 2 Normative references .1 3 Font Data Format 1 4 Font Compression Technology.
12、2 4.1 Overview 2 4.2 Compressed Font Format Specification.2 5 Font Data Stream 12 5.1 Structure of the Font Data Stream 12 5.2 Access Unit Definition12 5.3 Time Base for Font Data Streams .14 5.4 Font Data Decoder Configuration .14 5.5 Accessing the Font Data15 6 Text Profiles and Levels.15 6.1 Simp
13、le Text Profile and Levels15 6.2 Advanced Simple Text Profile and Levels16 6.3 Main Text Profile and Levels17 Annex A (informative) Patent Statements18 BS ISO/IEC 1449618:2004 Licensed Copy: London South Bank University, London South Bank University, Tue Jan 23 07:42:20 GMT+00:00 2007, Uncontrolled
14、Copy, (c) BSI iv Foreword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate in the development of International Standar
15、ds through technical committees established by the respective organization to deal with particular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, in liaison with ISO and IE
16、C, also take part in the work. In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of the joint technical committee is
17、to prepare International Standards. Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an International Standard requires approval by at least 75 % of the national bodies casting a vote. Attention is drawn to the possib
18、ility that some of the elements of this document may be the subject of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights. ISO/IEC 14496-18 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 29, Coding
19、of audio, picture, multimedia and hypermedia information. ISO/IEC 14496 consists of the following parts, under the general title Information technology Coding of audio-visual objects: Part 1: Systems Part 2: Visual Part 3: Audio Part 4: Conformance testing Part 5: Reference software Part 6: Delivery
20、 Multimedia Integration Framework (DMIF) Part 7: Optimized reference software for coding of audio-visual objects Part 8: Carriage of ISO/IEC 14496 contents over IP networks Part 9: Reference hardware description Part 10: Advanced Video Coding Part 11: Scene description and application engine Part 12
21、: ISO base media file format Part 13: Intellectual Property Management and Protection (IPMP) extensions Part 14: MP4 file format Part 15: Advanced Video Coding (AVC) file format Part 16: Animation Framework eXtension (AFX) BS ISO/IEC 1449618:2004 Licensed Copy: London South Bank University, London S
22、outh Bank University, Tue Jan 23 07:42:20 GMT+00:00 2007, Uncontrolled Copy, (c) BSI v Part 17: Streaming text format Part 18: Font compression and streaming Part 19: Synthesized texture stream BS ISO/IEC 1449618:2004 Licensed Copy: London South Bank University, London South Bank University, Tue Jan
23、 23 07:42:20 GMT+00:00 2007, Uncontrolled Copy, (c) BSI vi Introduction ISO/IEC 14496 specifies a system for the communication of interactive audio-visual scenes. The specification includes the following elements: 1. the coded representation of natural or synthetic, two-dimensional (2D) or three-dim
24、ensional (3D) objects that can be manifested audibly and/or visually (audio-visual objects) (specified in part 1,2 and 3 of ISO/IEC 14496); 2. the coded representation of the spatio-temporal positioning of audio-visual objects as well as their behaviour in response to interaction (scene description,
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