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

CSA Group
Standards Development Organisation:
Canadian Standards Association (operating as CSA Group)
Working Program:
View the CSA work program
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.

Note: The information provided above was obtained by the Standards Council of Canada (SCC) and is provided as part of a centralized, transparent notification system for new standards development. The system allows SCC-accredited Standards Development Organizations (SDOs), and members of the public, to be informed of new work in Canadian standards development, and allows SCC-accredited SDOs to identify and resolve potential duplication of standards and effort.

Individual SDOs are responsible for the content and accuracy of the information presented here. The text is presented in the language in which it was provided to SCC.