Overview
ISO/IEC 14496-20:2008/Amd 1:2009 is an important amendment to the international standard for coding of audio-visual objects, specifically Part 20 which addresses the Lightweight Application Scene Representation (LASeR) and the Simple Aggregation Format (SAF). This amendment introduces key extensions to support the Scalable Vector Graphics Tiny 1.2 (SVGT1.2) specification, a W3C recommendation designed for efficient graphics rendering on mobile and constrained devices.
By integrating support for SVGT1.2, this amendment enhances LASeR/SAF's capabilities in managing vector graphics animations and interactive media, optimizing them for lightweight processing within diverse device environments. The update defines new event interfaces, attributes, scripting commands, and element properties to align LASeR and SAF formats with the advanced SVG Tiny 1.2 functionalities.
Key Topics
- SVGT1.2 Integration: Incorporates support for SVG Tiny 1.2, enabling richer vector graphics representation for audio-visual content on constrained devices.
- Screen Orientation Events: Defines the
ScreenOrientationEvent interface, introducing attributes like screenWidth, screenHeight, and screenAngle to accurately report device orientation and viewport dimensions.
- Immediate Script Execution: Adds the
doScript command for immediate execution of ECMAScript scripts, increasing interactivity and control within LASeR content.
- State Management Commands: Expands state management capabilities with enhanced
Save, Restore, and Clean commands to control persistent state within media streams. These commands utilize group identifiers and domain-path matching for precise state handling.
- Scene Stream Seeking: Introduces the
seek command, allowing timeline manipulation of scene streams akin to animation control, based on clock values defined in SVGT1.2.
- Extended SVGT Elements: Specifies support for SVGT1.2 specific elements such as
discard, handler, prefetch, solidColor, tBreak, and textArea to broaden rendering and interaction options.
- Attribute Expansion: Revises summary of element attributes for multiple SVG elements, ensuring compatibility with new SVG Tiny 1.2 features and LASeR-specific extensions - including navigation properties, rendering behaviors, and event attributes.
Applications
- Mobile Multimedia Platforms: Enhances multimedia content delivery on mobile devices by leveraging lightweight SVG graphics and optimized scene representation.
- Broadcast and Streaming Services: Supports interactive and dynamic overlays in streaming applications where vector graphics and scene aggregation are critical.
- Embedded and IoT Devices: Provides efficient vector graphics support for embedded systems with limited processing power or memory, improving UI responsiveness.
- Digital Signage and Advertising: Enables sophisticated graphical presentations with scripted behaviors and orientation sensitivity, useful in dynamic digital signage systems.
- Interactive E-books and Augmented Reality: Facilitates complex multimedia scenes combining vector graphics, animations, and scripted interactions for immersive experiences.
Related Standards
- ISO/IEC 14496 (MPEG-4): The parent series addressing multimedia coding of audio-visual content.
- W3C SVG Tiny 1.2 Specification: The W3C recommendation for scalable vector graphics tailored to mobile devices, fully integrated by this amendment.
- 3GPP DIMS: Provides definitions and semantics for scripting commands and interactive multimedia, referenced for script execution within LASeR.
- RFC 2965: Related to HTTP State Management for cookie-like behavior used in saved state handling in LASeR.
- ISO/IEC JTC 1/SC 29: The joint technical committee responsible for multimedia coding standards, including the LASeR and SAF formats.
By extending ISO/IEC 14496-20 with SVGT1.2 support, this amendment significantly improves the efficiency, flexibility, and interactive capabilities of audio-visual object coding, making it ideal for modern multimedia applications across a range of devices and platforms.
Open preview (PDF)Information technology — Coding of audio-visual objects — Part 20: Lightweight Application Scene Representation (LASeR) and Simple Aggregation Format (SAF) — Amendment 1: Extensions to support SVGT1.2