ISO/IEC 14496-4:2004/Amd 26:2008

Information technology — Coding of audio-visual objects — Part 4: Conformance testing — Amendment 26: Conformance levels and bitstreams for Open Font Format

Technologies de l'information — Codage des objets audiovisuels — Partie 4: Essai de conformité — Amendement 26: Niveaux de conformité et bitstreams pour format de police ouvert

General Information

• Status: Published
• Publication Date: 16-Sep-2008
• ICS: 35.040 - Information coding
• ICS: 35.040.40 - Coding of audio, video, multimedia and hypermedia information
• Technical Committee: ISO/IEC JTC 1/SC 29 - Coding of audio, picture, multimedia and hypermedia information
• Drafting Committee: ISO/IEC JTC 1/SC 29 - Coding of audio, picture, multimedia and hypermedia information
• Current Stage: 6060 - International Standard published
• Start Date: 29-Jul-2008
• Due Date: 10-May-2010
• Completion Date: 17-Sep-2008

Relations

• Child: ISO/IEC 14496-4:2004 - Information technology — Coding of audio-visual objects — Part 4: Conformance testing
• Effective Date: 15-Apr-2008
• Amends: ISO/IEC 14496-4:2004 - Information technology — Coding of audio-visual objects — Part 4: Conformance testing
• Effective Date: 06-Jun-2022

Standards Content (Sample)

INTERNATIONAL ISO/IEC
STANDARD 14496-4
Second edition
2004-12-15
AMENDMENT 26
2008-10-01

Information technology — Coding of
audio-visual objects —
Part 4:
Conformance testing
AMENDMENT 26: Conformance levels and
bitstreams for Open Font Format
Technologies de l'information — Codage des objets audiovisuels —
Partie 4: Essai de conformité
AMENDEMENT 26: Niveaux de conformité et bitstreams pour format de
police ouvert




Reference number
ISO/IEC 14496-4:2004/Amd.26:2008(E)
©
ISO/IEC 2008

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ISO/IEC 14496-4:2004/Amd.26:2008(E)

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be viewed using Adobe® Acrobat® Reader;
2) TrueType and OpenType font files relevant to Open Font Format conformance testing.
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...

INTERNATIONAL ISO/IEC
STANDARD 14496-4
Second edition
2004-12-15
AMENDMENT 26
2008-10-01

Information technology — Coding of
audio-visual objects —
Part 4:
Conformance testing
AMENDMENT 26: Conformance levels and
bitstreams for Open Font Format
Technologies de l'information — Codage des objets audiovisuels —
Partie 4: Essai de conformité
AMENDEMENT 26: Niveaux de conformité et bitstreams pour format de
police ouvert




Reference number
ISO/IEC 14496-4:2004/Amd.26:2008(E)
©
ISO/IEC 2008

---------------------- Page: 1 ----------------------
ISO/IEC 14496-4:2004/Amd.26:2008(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.


COPYRIGHT PROTECTED DOCUMENT


©  ISO/IEC 2008
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
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ii © ISO/IEC 2008 – All rights reserved

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ISO/IEC 14496-4:2004/Amd.26:2008(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
Amendment 26 to ISO/IEC 14496-4:2004 was prepared by Technical Committee ISO/IEC/TC , Information
Technology, Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information.
It defines the conformance test procedures for implementations compliant with ISO/IEC 14496-22 “Open Font
Format” and ISO/IEC 14496-18 “Font compression and streaming”.

© ISO/IEC 2008 – All rights reserved iii

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ISO/IEC 14496-4:2004/Amd.26:2008(E)

Information technology — Coding of audio-visual objects —
Part 4:
Conformance testing
AMENDMENT 26: Conformance levels and bitstreams for Open
Font Format
After 4.15, add the following subclause:
4.16 Font data conformance
4.16.1 Font data conformance levels
4.16.1.1 Open Font conformance levels
ISO/IEC 14496-22 “Open Font Format” (OFF) defines an extensible mechanism for font data representation
1)
that is based on the industry standard OpenType® font format. The standard allows representation of font
2)
data with outline information encoded in one of the two basic formats – with TrueType™ outlines, and with
3)
outlines encoded using Compact Font Format (CFF, a compressed representation of Adobe PostScript®
Type 1 fonts) developed by Adobe Systems Incorporated.
Font data may be represented using collections of tables, which include a set of required tables, a set of
tables that are related to TrueType outlines, a set of tables that are related to CFF outlines, and a set of
relevant optional tables, e.g. the tables that support advanced typographic features and advanced text layout
for complex scripts. The five different OFF conformance levels are defined, which correspond to the following
functionality of fonts:
1) Fonts that contain only required tables and the subset of tables related to TrueType outlines with
no hints (i.e. unhinted TrueType outlines only). Conformance at this level shall be claimed if the
following set of tables is supported: ‘cmap’, ‘head’, ‘hhea’, ‘hmtx’, ‘maxp’, ‘name’, ‘OS/2’, ‘post’,
‘loca’ and ‘glyf’ (where hint instructions that may be part of glyph outline data should be ignored).
2) Fonts that contain only required tables and the full set of tables related to TrueType outlines
(including TrueType hints). Conformance at this level shall be claimed only if the following set of
tables is supported: ‘cmap’, ‘head’, ‘hhea’, ‘hmtx’, ‘maxp’, ‘name’, ‘OS/2’, ‘post’, ‘cvt’, ‘fpgm’ ‘prep’,
‘loca’ and ‘glyf’.
3) Fonts that contain only required tables and the tables related to CFF outlines. Conformance at this
level shall be claimed if the following set of tables is supported: ‘cmap’, ‘head’, ‘hhea’, ‘hmtx’,
‘maxp’, ‘name’, ‘OS/2’, ‘post’, ‘CFF’ and ‘VORG’. Please note that this level may include OFF TTC
fonts with CFF outlines, however, support for TTC font collections is not required for terminals
claiming compliance at this level.

1) OpenType is a registered trademark of Microsoft Corporation.
2) TrueT
...