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ISO 14496-20 Document Information:
Title
Information technology — Coding of audio-visual objects — Part 20: Lightweight Application Scene Representation (LASeR) and Simple Aggregation Format (SAF)
International Organization for Standardization
Publication Date:
Dec 1, 2008
Scope:
This part of ISO/IEC 14496 defines a scene description format
(LASeR) and an aggregation format (SAF) respectively suitable for
representing and delivering rich-media services to
resource-constrained devices such as mobile phones.
LASeR aims at fulfilling all the requirements of rich-media
services at the scene description level. LASeR supports
— an optimized set of objects inherited from SVG to describe
rich-media scenes,
— a small set of key compatible extensions over SVG,
— the ability to encode and transmit a LASeR stream and then
reconstruct SVG content,
— dynamic updating of the scene to achieve a reactive, smooth
and continuous service,
— simple yet efficient compression to improve delivery and
parsing times, as well as storage size, one of the design goals
being to allow both for a direct implementation of the SDL as
documented, as well as for a decoder compliant with ISO/IEC 23001-1
to decode the LASeR bitstream,
— an efficient interface with audio and visual streams with
frame-accurate synchronization,
— use of any font format, including the OpenType industry
standard, and
— easy conversion from other popular rich-media formats in order
to leverage existing content and developer communities.
Technology selection criteria for LASeR included compression
efficiency, but also code and memory footprint and performance.
Other aims included: scalability, adaptability to the user context,
extensibility of the format, ability to define small profiles,
feasibility of a J2ME implementation, error resilience and safety
of implementations.
SAF aims at fulfilling all the requirements of rich-media
services at the interface between media/scene description and
existing transport protocols:
— simple aggregation of any type of stream,
— signalling of MPEG and non-MPEG streams,
— optimized packet headers for bandwidth-limited networks,
— easy mapping to popular streaming formats,
— cache management capability, and
— extensibility.
SAF has been designed to complement LASeR for simple,
interactive services, bringing
— efficient and dynamic packaging to cope with high latency
networks,
— media interleaving, and
— synchronization support with a very low overhead.
This part of ISO/IEC 14496 defines the usage of SAF for LASeR
content; however, LASeR can be used independently from SAF.
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