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Proceedings of 2009 International Workshop on Information Security and Application (IWISA 2009)

Qingdao, China, November 21-22, 2009

Editors: Feng Gao and Xijun Zhu

AP Catalog Number: AP-PROC-CS-09CN004

ISBN: 978-952-5726-06-0

Page(s): 372-375

A Group-based Low Delay Variable Length Decoder for MPEG-4

Xue-quan Hu, Gao-ming Du, Duo-li Zhang, Yu-kun Song, and Ming-lun Gao

Full text: PDF


A new grouping method for variable-length code (VLC) table is presented. It takes advantage of a unified look-up table and generates the table address by comparing the input data bit-by-bit. In theory, it can significantly decrease the critical path delay of the circuit. Experimental result shows that the decoding speed is 2 cycles per no-escape code and 2 to 4 cycles per escape code. The decoder has been integrated into a mpeg-4 decoder of 1080P video. And the FPGA prototype result shows that the frequency could achieve 255MHz.

Index Terms

group-based; variable length decoding; low-latency; MPEG-4

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