MPEG Reconfigurable Video Coding - Signal Processing Systems - page 292

+

Parser
BSDL

Encoded
Bitstream

Residu
RVC-CAL

Decoded
Video

+

Motion Compensation
RVC-CAL

Picture Buffering
RVC - CAL

Fig. 17 Hybrid decoder structure

MOTION COM PENSATION (Y)

TEXTU RE DECODI NG (Y)

MOTIO N COM PENSATION (U)

[01111001...]
BITSTREAM

TEXT URE DECODI NG (U)

DECODED DATA

MOTION COM PENSATION (V)

TEXTU RE DECODI N G (V)

Fig. 18 MPEG-4 simple profile decoder description

motion compensation. Therefore, MPEG-4 SP and MPEG-4 AVC are hybrid
decoders. Figure 17 shows the main functional blocks composing an hybrid decoder
structure.
As said earlier, an RVC decoder is described as a block diagram with FNL [ 26 ] ,
an XML dialect that describes the structural network of interconnected actors from
the Standard MPEG Toolbox. The only two case studies performed so far by MPEG
RVC experts [ 32 , 52 ] are the RVC-C AL specifications of MPEG-4 Simple Profile
decoder and MPEG-4 AVC decoder [ 19 ] .

4.6.2 MPEG-4 Simple Profile (SP) Decoder

Figure 18 shows the network representation of the macroblock-based MPEG-4
Simple Profile decoder description. The parser is a hierarchical network of actors
(each of them is described in a separate FNL file). All other blocks are atomic actors
programmed in RVC-C AL . Figure 18 presents the structure of the MPEG-4 Simple
Profile ADM as described within RVC. Essentially it is composed of four main
parts: the parser, a luminance component (Y) processing path, and two chrominance
component (U, V) processing paths. Each of the path is composed by its texture