An efficient software implementation of the CAVLC encoder for H.264/AVC

Author

Hoffman, Marc P. ; Balster, Eric J. ; Scarpino, Frank ; Hill, Kerry

Author_Institution

Sch. of Electr. & Comput. Eng., Univ. of Dayton, Dayton, OH, USA

fYear

2011

fDate

20-22 July 2011

Firstpage

333

Lastpage

337

Abstract

Context Adaptive Variable-Length Coding (CAVLC) is employed by H.264/AVC for lossless encoding of quantized and predicted frames for compression gain. One of the most common methods for implementing CAVLC involves heavy reliance on look up tables (LUTs) to acquire a context adapted VLC. However the use of multiple LUTs results in large memory requirements for an embedded design. The largest LUT is used when the CAVLC encoder encodes the non-zero coefficients, called levels. To reduce memory requirements, a method for encoding levels without LUTs is proposed. In this paper, a simple realization of CAVLC in software is investigated and implemented for verification and validation testing.

Keywords

adaptive codes; audio coding; embedded systems; program testing; program verification; quantisation (signal); table lookup; variable length codes; video coding; CAVLC encoder; H.264-AVC; compression gain; context adapted VLC; context adaptive variable-length coding; embedded design; large memory requirement reduction; look up tables; lossless encoding levels; multiple LUT; nonzero coefficient; predicted frame; quantized frame; software implementation; validation testing; verification testing; Decoding; Encoding; Hardware; Memory management; Software; Table lookup; Vectors;

fLanguage

English

Publisher

ieee

Conference_Titel

Aerospace and Electronics Conference (NAECON), Proceedings of the 2011 IEEE National

Conference_Location

Dayton, OH

ISSN

0547-3578

Print_ISBN

978-1-4577-1040-7

Type

conf

DOI

10.1109/NAECON.2011.6183127

Filename

6183127