Information technology - Coding of audio-visual objects - Part 20: Lightweight application scene representation (LASeR) and simple aggregation format (SAF)

Designation Number:
CSA ISO/IEC 14496-20:09 (R2019)
Standard Type:
National Standard of Canada - Adoption of International Standard
Standard Development Activity:
Reaffirmation
ICS code(s):
35.040
Status:
Proceeding to development
SDO Comment Period Start Date:
SDO Comment Period End Date:
Posted On:

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 scene

 

⎯ 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.

Project need:

To review the Standard within the required 5 year period.

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