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Proceedings Paper

Improving data caching for software MPEG video decompression
Author(s): Wu-chi Feng; Stuart Sechrest
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Paper Abstract

Software implementations of MPEG decompression provide flexibility at low cost but suffer performance problems, including poor cache behavior. For MPEG video, decompressing the video in the implied order does not take advantage of coherence generated by dependent macroblocks and, therefore, undermines the effectiveness of processor caching. In this paper, we investigate the caching performance gain which is available to algorithms that use different traversal algorithms to decompress these MPEG streams. We have found that the total cache miss rate can be reduced considerably at the expense of a small increase in instructions. To show the potential gains available, we have implemented the different traversal algorithms using the standard Berkeley MPEG player. Without optimizing the MPEG decompression code itself, we are able to obtain better cache performance for the traversal orders examined. In one case, faster decompression rates are achieved by making better use of processor caching, even though additional overhead is introduced to implement the different traversal algorithm. With better instruction-level support in future architectures, low cache miss rates will be crucial for the overall performance of software MPEG video decompression.

Paper Details

Date Published: 22 March 1996
PDF: 11 pages
Proc. SPIE 2668, Digital Video Compression: Algorithms and Technologies 1996, (22 March 1996); doi: 10.1117/12.235406
Show Author Affiliations
Wu-chi Feng, Univ. of Michigan (United States)
Stuart Sechrest, Univ. of Michigan (United States)

Published in SPIE Proceedings Vol. 2668:
Digital Video Compression: Algorithms and Technologies 1996
Vasudev Bhaskaran; Frans Sijstermans; Sethuraman Panchanathan, Editor(s)

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