From AVC Decoder to SVC: Minor Impact on a Dataflow Graph Description

The Joint Video Team (JVT) of the ITU-T Video Coding Experts Group (VCEG) and the ISO/IEC Moving Picture Experts Group (MPEG) has standardized a scalable video coding (SVC) extension of the H.264/AVC standard. Thanks to SVC, it is possible to partially transmit or decode a video bitstream resulting in various video qualities (spatial, temporal or reduced delity). Within our lab, the aim is to develop an SVC decoder that is easily recon gurable for di erent computing architectures such as mono or multiprocessors. Our data ow methodology enables such rapid prototyping and facilitates the extension from AVC to SVC. The MPEG Recon gurable Video Coding (RVC) project uses the same kind of data ow description to unify MPEG codecs in a single recon gurable decoder. In this paper, ways to reuse AVC data ow blocks are investigated while developing an SVC decoder such as in RVC. Necessary memory extensions and enhancement layer decoding optimisations are described as well as experimental results. Rapid prototyping on several architectures shows that the impacts of SVC extension are quite limited. Furthermore, both processing time and memory consumption remain reasonable. Index Terms Advanced Video Coding; Scalable Video Coding; Recon gurable Video Coding; data ow model of computation; Digital Signal Processor