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Bitstream decoding processor for fast entropy decoding of variable length coding-based multiformat videos

机译:比特流解码处理器,用于基于可变长度编码的多格式视频的快速熵解码

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摘要

We present a bitstream decoding processor for entropy decoding of variable length coding-based multiformat videos. Since most of the computational complexity of entropy decoders comes from bitstream accesses and table look-up process, the developed bitstream processing unit (BsPU) has several designated instructions to access bitstreams and to minimize branch operations in the table look-up process. In addition, the instruction for bitstream access has the capability to remove emulation prevention bytes (EPBs) of H.264/AVC without initial delay, repeated memory accesses, and additional buffer. Experimental results show that the proposed method for EPB removal achieves a speed-up of 1.23 times compared to the conventional EPB removal method. In addition, the BsPU achieves speed-ups of 5.6 and 3.5 times in entropy decoding of H.264/AVC and MPEG-4 Visual bitstreams, respectively, compared to an existing processor without designated instructions and a new table mapping algorithm. The BsPU is implemented on a Xilinx Virtex5 LX330 field-programmable gate array. The MPEG-4 Visual (ASP, Level 5) and H.264/AVC (Main Profile, Level 4) are processed using the developed BsPU with a core clock speed of under 250 MHz in real time.
机译:我们提出一种用于基于变长编码的多格式视频的熵解码的比特流解码处理器。由于熵解码器的大多数计算复杂度来自位流访问和表查找过程,因此,开发的位流处理单元(BsPU)具有数个指定指令来访问位流并最小化表查找过程中的分支操作。另外,用于比特流访问的指令具有删除H.264 / AVC的仿真防止字节(EPB)的能力,而无需初始延迟,重复的存储器访问和附加缓冲区。实验结果表明,与传统的EPB去除方法相比,所提出的EPB去除方法可实现1.23倍的加速。此外,与没有指定指令和新表映射算法的现有处理器相比,BsPU在H.264 / AVC和MPEG-4 Visual比特流的熵解码中分别实现了5.6和3.5倍的加速。 BsPU在Xilinx Virtex5 LX330现场可编程门阵列上实现。 MPEG-4 Visual(ASP,级别5)和H.264 / AVC(主配置文件,级别4)使用开发的BsPU实时处理,其核心时钟速度低于250 MHz。

著录项

  • 来源
    《Optical engineering》 |2014年第6期|063102.1-063102.12|共12页
  • 作者

    Hyunho Jo; Donggyu Sim;

  • 作者单位

    Kwangwoon University, Department of Computer Engineering, Kwangwoon-ro 20, Seoul 139-701, Republic of Korea;

    Kwangwoon University, Department of Computer Engineering, Kwangwoon-ro 20, Seoul 139-701, Republic of Korea;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    entropy decoding; emulation prevention byte; H.264/AVC; multiformat videos;

    机译:熵解码仿真防止字节;H.264 / AVC;多格式视频;

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