A Novel Wavefront-Based High Parallel Solution for HEVC Encoding
A Novel Wavefront-Based High Parallel Solution for HEVC Encoding
复制标题
一种新颖的基于波前的 HEVC 编码高并行解决方案
DOI:
10.1109/tcsvt.2015.2418651
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发表时间:
2016
期刊:
影响因子:
--
通讯作者:
Zongming Guo
中科院分区:
文献类型:
--
作者:
Keji Chen;Jun Sun;Yizhou Duan;Zongming Guo
With a lot of enhanced coding tools introduced, High Efficiency Video Coding (HEVC) achieves significant improvement in coding efficiency at the cost of increased computational complexity. To efficiently reduce the encoding time of HEVC, a wavefront-based high parallel (WHP) solution integrating novel data-level and task-level methods is proposed in this paper. On data level, optimal single-instruction-multiple-data algorithms are designed for the enhanced coding tools, i.e., replacing the multiplication in motion compensation by add and shift operations with reduced instruction cycles, removing the transpose in transform via realignment of coefficients, and minimizing the memory access in sum of absolute difference/sum of squared differences calculation by fully reusing the registers. On task level, a novel inter-frame wavefront (IFW) method is developed by effectively decreasing the dependence of wavefront parallel processing (WPP). In addition, a coding tree block level parallelism analysis method is presented to prove the superior of IFW method compared with other HEVC representative parallel methods. Besides, a three-level thread management scheme is proposed to best exploit the parallelism of IFW method and achieve corresponding encoding speedup. Extensive experimental results show that, the overall WHP solution can bring up to $57.65\times $ , $65.55\times $ , and $88.17\times $ speedup for HEVC encoding of Wide Video Graphics Array, 720p and 1080p standard test sequences, while maintaining the same coding performance as with WPP. The proposed solution is also applied in several leading video companies in China, providing HEVC video service for more than 1.3 million users everyday.
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DOI:
10.1007/s11265-008-0256-9
发表时间:
2009-11
期刊:
Journal of Signal Processing Systems
影响因子:
--
作者:
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通讯作者:
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2009-11
影响因子:
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通讯作者:
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2012-12-01
影响因子:
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通讯作者:
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2003-05
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影响因子:
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通讯作者:
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发表时间:
2006-04
期刊:
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影响因子:
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通讯作者:
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