Codec Design for Variable-Length to Fixed-Length Data Conversion for H.263

A codec (encoder-decoder) design for interfacing variable-length and fixed-length data conversion is proposed in this paper. The poor memory efficiency of the variable-length compression approach can be avoided while its advantages can be preserved. The introduction of the proposed codec converts the variable-length symbols into fixed-length packets which can be hardwaredly and parallelly processing without waiting for any other information, which indicates the decoding process is context-free. The proposed codec encodes extra symbols in the redundant bits of the padding bits of the fixed-length packets. This novel encoding scheme relaxes the intrinsic poor bit rate of the traditional fixed-length data compression.