Optimizing the critical loop in the H.264/AVC CABAC decoder

Eeckhaut, Hendrik; Christiaens, Mark; Stroobandt, Dirk; Nollet, V.

doi:10.1109/fpt.2006.270301

Cited by 23 publications

(15 citation statements)

References 13 publications

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“…In [3], memory and look-up tables are reorganized in order to reduce the number of accesses. However, it only focuses on the recursive part, assuming the context number (model in the paper) is automatically supplied.…”

Section: Results Evaluationmentioning

confidence: 99%

An FPGA architecture for CABAC decoding in manycore systems

Osorio

Bruguera

2008

2008 International Conference on Application-Specific Systems, Architectures and Processors

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Arithmetic coding is an efficient entropy compression method that achieves results close to the entropy limit and it is used in modern standards such as JPEG-2000 and H.264. Arithmetic decoding (AD) in H.264 video coding standard is a sequential task that takes a significant part of computing time. In present and future multicore and manycore systems, AD becomes a bottleneck as it cannot be parallelized, limiting the concurrent execution of other tasks. In this paper, an FPGA-based accelerator is proposed to speed-up AD in H.264 and enable parallel decoding at macroblock and frame levels scaling up to tens or hundreds of cores.

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Section: Results Evaluationmentioning

confidence: 99%

An FPGA architecture for CABAC decoding in manycore systems

Osorio

Bruguera

2008

2008 International Conference on Application-Specific Systems, Architectures and Processors

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“…In their solution Eeckhaut et al 11 have optimized the critical path through both the model selector and the arithmetic decoder. The critical path through the model selector can be kept short by calculating every possible next model in advance.…”

Section: Hardware Solutionsmentioning

confidence: 99%

“…Schematic of the calculations, originally represented by Eeckhaut et al,11 for decoding a result bit (nM ) with model M . For clarity, the schematic has been simplified from the original publication.…”

mentioning

confidence: 99%

Context adaptive binary arithmetic decoding on transport triggered architectures

Rouvinen

Jääskeläinen

Rintaluoma³

et al. 2008

Multimedia on Mobile Devices 2008

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Video coding standards, such as MPEG-4, H.264, and VC1, define hybrid transform based block motion compensated techniques that employ almost the same coding tools. This observation has been a foundation for defining the MPEG Reconfigurable Multimedia Coding framework that targets to facilitate multi-format codec design. The idea is to send a description of the codec with the bit stream, and to reconfigure the coding tools accordingly on-the-fly. This kind of approach favors software solutions, and is a substantial challenge for the implementers of mobile multimedia devices that aim at high energy efficiency. In particularly as high definition formats are about to be required from mobile multimedia devices, variable length decoders are becoming a serious bottleneck. Even at current moderate mobile video bitrates software based variable length decoders swallow a major portion of the resources of a mobile processor. In this paper we present a Transport Triggered Architecture (TTA) based programmable implementation for Context Adaptive Binary Arithmetic de-Coding (CABAC) that is used e.g in the main profile of H.264 and in JPEG2000. The solution can be used even for other variable length codes.

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“…Though CAVLC is a lot more easy to implement and less power hungry, CAVLC gets the value directly by reading the bit-stream. However with CABAC the complexity is more important as there is a feedback loop between the context modeler and the arithmetic coder [2].…”

Section: Cabac Entropy Decodermentioning

confidence: 99%

RVC-CAL dataflow implementations of MPEG AVC/H.264 CABAC decoding

Bezati

Mattavelli

Raulet

2010

2010 Conference on Design and Architectures for Signal and Image Processing (DASIP)

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To cite this version:Endri Bezati, Marco Mattavelli, Mickael Raulet. AbstractThis paper presents the implementation of the CABAC entropy decoder in the RVC-CAL dataflow programming language. CABAC is the Context based Adaptive Binary Arithmetic Coding entropy decoder used in the AVC/H.264 main and high profile video standard. CABAC as an entropy decoding engine gives a better compression rate efficiency, but has a greater complexity compared to other entropy decoding engines. With the implementation of the CABAC entropy decoder in RVC-CAL, this paper is a proof that complex algorithms can be implemented in a high level design and that can be described in a data flow language as RVC-CAL is. Thought in this paper we are going to analyze two different methods of implementing the CABAC entropy decoder and propose a data flow model of the CABAC entropy decoder in RVC-CAL.

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Optimizing the critical loop in the H.264/AVC CABAC decoder

Cited by 23 publications

References 13 publications

An FPGA architecture for CABAC decoding in manycore systems

An FPGA architecture for CABAC decoding in manycore systems

Context adaptive binary arithmetic decoding on transport triggered architectures

RVC-CAL dataflow implementations of MPEG AVC/H.264 CABAC decoding

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