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

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
ISO/IEC 14496-4:2004/Amd.26:2008(E)
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ii © ISO/IEC 2008 – All rights reserved

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
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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

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
...