Abstract
The next-generation 8K ultra-high-definition video format involves an extremely high bit rate, which imposes a high throughput requirement on the entropy decoder component of a video decoder. Context adaptive binary arithmetic coding (CABAC) is the entropy coding tool in the latest video coding standards including H.265/High Efficiency Video Coding and H.264/Advanced Video Coding. Due to critical data dependencies at the algorithm level, a CABAC decoder is difficult to be accelerated by simply leveraging parallelism and pipelining. This letter presents a new very-large-scale integration arithmetic decoder, which is the most critical bottleneck in CABAC decoding. Our design features a variable-clock-cycle-path architecture that exploits the differences in critical path delay and in probability of occurrence between various types of binary symbols (bins). The proposed design also incorporates a novel data-forwarding technique (rLPS forwarding) and a fast path-selection technique (coarse bin type decision), and is enhanced with the capability of processing additional bypass bins. As a result, its maximum throughput achieves 1010 Mbins/s in 90-nm CMOS, when decoding 0.96 bin per clock cycle at a maximum clock rate of 1053 MHz, which outperforms previous works by 19.1%.
Original language | English |
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Article number | 7577726 |
Pages (from-to) | 556-560 |
Number of pages | 5 |
Journal | IEEE Transactions on Circuits and Systems for Video Technology |
Volume | 28 |
Issue number | 2 |
DOIs | |
Publication status | Published - 2018 Feb 1 |
Keywords
- Arithmetic decoder
- context adaptive binary arithmetic coding (CABAC)
- H.265
- High Efficiency Video Coding (HEVC)
ASJC Scopus subject areas
- Media Technology
- Electrical and Electronic Engineering