4 Overview and architecture

26.4303GPPRelease 17Timed graphicsTS

Timed graphics has two main components: The graphics description, i.e. the actual images, and the layout, i.e. a coordinate system describing the placement of the images.

Timed graphics is designed in as a media type. It can coexist with umbrella systems (e.g. DIMS or SMIL) just as other media types do, yet contains components from DIMS or other media types.

Figure 1: Example of a Timed Graphics stream, in parallel to an audio and video stream.
No "umbrella" scene description is present.

Timed graphics may be realized in one of two ways: SVG-based timed graphics or simple timed graphics mode. In the SVG-based timed graphics, the layout and timing are controlled by the SVG scene. The transport and storage are inherited from DIMS. In the simple timed graphics mode, a binary representation format is defined to enable simple embedding of graphics elements. The transport over RTP and the storage in the 3GP file format are defined by this specification.