Field programmable gate array implementation of variable-bins high efficiency video coding CABAC decoder with path delay optimisation

Context-based adaptive binary arithmetic coding (CABAC) is a single operation mode for entropy coding in the last video coding standard high-efficiency video coding. For high-resolution applications, the throughput of one bin/cycle is not sufficient and it is a very challenging task to implement pip...

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Vydáno v:	IET image processing Ročník 13; číslo 6; s. 954 - 963
Hlavní autoři:	Menasri, Wahiba, Skoudarli, Abdellah, Belhadj, Aichouche, Azzaz, Mohamed Salah
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	The Institution of Engineering and Technology 01.05.2019
Témata:	2.2 bins/cycle adaptive codes algorithm‐architecture adequation arithmetic codes bin/cycle binary codes CABAC decoder throughput CABAC decoding architecture context‐based adaptive binary arithmetic coding critical path delay decoding entropy codes entropy coding field programmable gate array implementation field programmable gate arrays frequency 123.49 MHz hardware description languages high‐resolution applications high‐throughput path delay optimisation pipeline architectures Research Article single operation mode throughput bottleneck variable‐bins high efficiency video coding CABAC decoder video coding video coding standard high‐efficiency video coding video decoding field programmable gate array implementation CABAC decoding architecture algorithm-architecture adequation field programmable gate arrays bin/cycle video coding standard high-efficiency video coding hardware description languages throughput bottleneck arithmetic codes path delay optimisation critical path delay high-throughput context-based adaptive binary arithmetic coding CABAC decoder throughput frequency 123.49 MHz binary codes entropy coding entropy codes single operation mode video coding adaptive codes 2.2 bins/cycle decoding high-resolution applications video decoding variable-bins high efficiency video coding CABAC decoder pipeline architectures
ISSN:	1751-9659, 1751-9667
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Shrnutí:	Context-based adaptive binary arithmetic coding (CABAC) is a single operation mode for entropy coding in the last video coding standard high-efficiency video coding. For high-resolution applications, the throughput of one bin/cycle is not sufficient and it is a very challenging task to implement pipeline and/or parallel CABAC decoding architecture by simply adding more stages. Indeed, the tight data dependencies make it difficult to parallelise and cause it to be a throughput bottleneck for video decoding. Consequently, in order to improve the CABAC decoder throughput, parallel and pipeline architectures are used in authors’ design. In this work, an algorithm-architecture adequation is proposed to implement a CABAC decoder on a field programmable gate array. Mainly, a new classification of 32 syntax elements is given to speed up the authors’ solution. Furthermore, the context selection and modelling of regular syntax elements are studied, designed and implemented. Finally, a novel technique of memories rearrangement to reduce the critical path delay required to process each binary symbol is proposed. As a result, the implementation can process 2.2 bins/cycle when operated at 123.49 MHz and exhibits an improved high-throughput of 271.678 Mbins/s. The hardware architecture is coded using hardware description language and synthesised using ISE Xilinx tools targeting the Virtex4 platform.
ISSN:	1751-9659 1751-9667
DOI:	10.1049/iet-ipr.2018.6336