ISO/IEC 14496-5:2001/Amd 16:2008

INTERNATIONAL ISO/IEC
STANDARD 14496-5
Second edition
2001-12-15
AMENDMENT 16
2008-07-15
Information technology — Coding
of audio-visual objects —
Part 5:
Reference software
AMENDMENT 16: Symbolic Music
Representation reference software
Technologies de l'information — Codage des objets audiovisuels —
Partie 5: Logiciel de référence
AMENDEMENT 16: Logiciel de référence pour la représentation
musicale symbolique
Reference number
ISO/IEC 14496-5:2001/Amd.16:2008(E)
©
ISO/IEC 2008
ISO/IEC 14496-5:2001/Amd.16:2008(E)
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ii © ISO/IEC 2008 – All rights reserved

ISO/IEC 14496-5:2001/Amd.16:2008(E)
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 Standards 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 IEC, 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 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 possibility 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.
Amendment 16 to ISO/IEC 14496-5:2001 was prepared by Joint Technical Committee ISO/IEC JTC 1,
Information technology, Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia
information.
This Amendment adds the Reference Software of Symbolic Music Representation as defined in
ISO/IEC 14496-23 and ISO/IEC 14496-11:2005/Amd.5.
There are two parts to the SMR reference software reference software — MPEG-4 Systems dependent and
MPEG-4 Systems independent parts. The MPEG-4 Systems dependent part is implemented and made
available as a revision to the IM1 reference software for MPEG-4 Systems. The MPEG-4 Systems
independent part is available as an independent implementation.

© ISO/IEC 2008 – All rights reserved iii

ISO/IEC 14496-5:2001/Amd.16:2008(E)
Information technology — Coding of audio-visual objects —
Part 5:
Reference software
AMENDMENT 16: Symbolic Music Representation reference
software
In Clause 3: "Audio reference software", add a row to the table:
audio/SNHC/mpeg4smr Symbolic Music Representation decoder and tools

In Clause 5: "Systems reference software", add a row to the table:
systems/IM1-SMR IM1 supporting SMR nodes

Add Annex D: "Guidance on SMR reference software" and rename Annexes D and E as Annexes E and F
respectively.
Annex D
(informative)
Guidance on SMR reference software
D.1 IM1 Reference Software update
In Systems/IM1-SMR directory the IM1 project has been enhanced to provide support for SMR, in more
details:
⎯ the Nodes.cpp, Nodes.h file has been updated to support the two new nodes (MusicScore and
ScoreShape);
⎯ the new MusicScoreProxy and ScoreShapeProxy classes have been created;
⎯ the new SMRDecoder project to build the decoder dll has been created, it provides the interface needed
for the integration with IM1, it uses the SMRDecoderLib to process the SMR bitstream, to generate a
bitmap representing the score and it is used also to manipulate the SMR content itself.
⎯ The MP4Enc application has been enhanced to allow the encoding in MP4 files of SMR information
together with the BIFS scene description.
© ISO/IEC 2008 – All rights reserved 1

ISO/IEC 14496-5:2001/Amd.16:2008(E)
IM1
MusicScoreProxy
SMRDecoder Other Decoders
SMRDecoderLib
Figure D.1 — Structure of IM1 with SMR
In Figure D.2 a UML diagram describes the relations of the new classes with the IM1 existing classes.
The ScoreShape and MusicScore classes represent the data model, they has as attributes the fields defined
in the nodes specification. The MusicScore class is derived from the StreamConsumer class since it has to
present the data coming from SMR decoder. The ScoreShapeProxy and the MusicScoreProxy are used to
render the nodes in the multimedia scene. The MusicScoreProxy class uses the SMRDecoder object to
interact with the Partitura object that contains the music score coming from the SMR stream.
The SMRDecoder class derived from the DecoderImp class implements the interface to decode data coming
from the SMR stream. The real decoding work is performed by the SMRInternalDecoder class that is a faça
...