Abstract
Variable length (VLC) is used in a large variety of lossless compression applications. A specially designed VLC, called universal variable length code (UVLC), is utilized in the latest video standard H.26L under development. In this work we propose a method that we call alternating coding (ALT coding) for UVLC. An efficient UVLC decoder is designed (ALT decoder) on the basis of it. ALT facilitates a much easier decoding scheme for UVLC. It frees the decoder from codeword tables and the sizes of the barrel shifters are reduced. The codeword tables and barrel shifters usually occupy the largest portion of the area in the traditional decoders and they are also performance limiting in terms of speed and power consumption. We compare the ALT decoder with one of the most efficient decoders called VLC decoder using plane separation (PLS). Our results show that the ALT decoder increases 257% in speed, decreases 41% in size, and consumes 45% power of the PLS decoder.
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