High throughput VLSI architecture for H.264/AVC context-based adaptive binary arithmetic coding (CABAC) decoding

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	High throughput VLSI architecture for H.264/AVC context-based adaptive binary arithmetic coding (CABAC) decoding
	Huang, Kai ; Ma, De ; Yan, Rong-jie ; Ge, Hai-tong ; Yan, Xiao-lang
刊名	JOURNAL OF ZHEJIANG UNIVERSITY-SCIENCE C-COMPUTERS & ELECTRONICS
	2013
卷号	14 期号:6 页码:449-463
关键词	H.264/AVC Context-based adaptive binary arithmetic coding (CABAC) Decoder VLSI
ISSN号	1869-1951
中文摘要	Context-based adaptive binary arithmetic coding (CABAC) is the major entropy-coding algorithm employed in H.264/AVC. In this paper, we present a new VLSI architecture design for an H.264/AVC CABAC decoder, which optimizes both decode decision and decode bypass engines for high throughput, and improves context model allocation for efficient external memory access. Based on the fact that the most possible symbol (MPS) branch is much simpler than the least possible symbol (LPS) branch, a newly organized decode decision engine consisting of two serially concatenated MPS branches and one LPS branch is proposed to achieve better parallelism at lower timing path cost. A look-ahead context index (ctxIdx) calculation mechanism is designed to provide the context model for the second MPS branch. A head-zero detector is proposed to improve the performance of the decode bypass engine according to UEGk encoding features. In addition, to lower the frequency of memory access, we reorganize the context models in external memory and use three circular buffers to cache the context models, neighboring information, and bit stream, respectively. A pre-fetching mechanism with a prediction scheme is adopted to load the corresponding content to a circular buffer to hide external memory latency. Experimental results show that our design can operate at 250 MHz with a 20.71k gate count in SMIC18 silicon technology, and that it achieves an average data decoding rate of 1.5 bins/cycle.
英文摘要	Context-based adaptive binary arithmetic coding (CABAC) is the major entropy-coding algorithm employed in H.264/AVC. In this paper, we present a new VLSI architecture design for an H.264/AVC CABAC decoder, which optimizes both decode decision and decode bypass engines for high throughput, and improves context model allocation for efficient external memory access. Based on the fact that the most possible symbol (MPS) branch is much simpler than the least possible symbol (LPS) branch, a newly organized decode decision engine consisting of two serially concatenated MPS branches and one LPS branch is proposed to achieve better parallelism at lower timing path cost. A look-ahead context index (ctxIdx) calculation mechanism is designed to provide the context model for the second MPS branch. A head-zero detector is proposed to improve the performance of the decode bypass engine according to UEGk encoding features. In addition, to lower the frequency of memory access, we reorganize the context models in external memory and use three circular buffers to cache the context models, neighboring information, and bit stream, respectively. A pre-fetching mechanism with a prediction scheme is adopted to load the corresponding content to a circular buffer to hide external memory latency. Experimental results show that our design can operate at 250 MHz with a 20.71k gate count in SMIC18 silicon technology, and that it achieves an average data decoding rate of 1.5 bins/cycle.
收录类别	SCI
语种	英语
WOS记录号	WOS:000320740100006
公开日期	2014-12-16
内容类型	期刊论文
源URL	[http://ir.iscas.ac.cn/handle/311060/16929]
专题	软件研究所_软件所图书馆_期刊论文
推荐引用方式 GB/T 7714	Huang, Kai,Ma, De,Yan, Rong-jie,et al. High throughput VLSI architecture for H.264/AVC context-based adaptive binary arithmetic coding (CABAC) decoding[J]. JOURNAL OF ZHEJIANG UNIVERSITY-SCIENCE C-COMPUTERS & ELECTRONICS,2013,14(6):449-463.
APA	Huang, Kai,Ma, De,Yan, Rong-jie,Ge, Hai-tong,&Yan, Xiao-lang.(2013).High throughput VLSI architecture for H.264/AVC context-based adaptive binary arithmetic coding (CABAC) decoding.JOURNAL OF ZHEJIANG UNIVERSITY-SCIENCE C-COMPUTERS & ELECTRONICS,14(6),449-463.
MLA	Huang, Kai,et al."High throughput VLSI architecture for H.264/AVC context-based adaptive binary arithmetic coding (CABAC) decoding".JOURNAL OF ZHEJIANG UNIVERSITY-SCIENCE C-COMPUTERS & ELECTRONICS 14.6(2013):449-463.