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Enabling MPEG-2 video playback in embedded systems through improved data cache efficiency

机译：通过提高数据缓存效率在嵌入式系统中启用MPEG-2视频播放

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Abstract: Digital video decoding, enabled by the MPEG-2 Video standard, is an important future application for embedded systems, particularly PDAs and other information appliances. Many such system require portability and wireless communication capabilities, and thus face severe limitations in size and power consumption. This places a premium on integration and efficiency, and favors software solutions for video functionality over specialized hardware. The processors in most embedded system currently lack the computational power needed to perform video decoding, but a related and equally important problem is the required data bandwidth, and the need to cost-effectively insure adequate data supply. MPEG data sets are very large, and generate significant amounts of excess memory traffic for standard data caches, up to 100 times the amount required for decoding. Meanwhile, cost and power limitations restrict cache sizes in embedded systems. Some systems, including many media processors, eliminate caches in favor of memories under direct, painstaking software control in the manner of digital signal processors. Yet MPEG data has locality which caches can exploit if properly optimized, providing fast, flexible, and automatic data supply. We propose a set of enhancements which target the specific needs of the heterogeneous types within the MPEG decoder working set. These optimizations significantly improve the efficiency of small caches, reducing cache-memory traffic by almost 70 percent, and can make an enhanced 4 KB cache perform better than a standard 1 MB cache. This performance improvement can enable high-resolution, full frame rate video playback in cheaper, smaller system than woudl otherwise be possible. !19
机译：摘要：由MPEG-2视频标准支持的数字视频解码是嵌入式系统（尤其是PDA和其他信息设备）未来的重要应用。许多这样的系统需要便携性和无线通信能力，因此在尺寸和功耗上面临严格的限制。这在集成性和效率上具有优势，并且相对于专用硬件而言，更倾向于用于视频功能的软件解决方案。目前，大多数嵌入式系统中的处理器都缺乏执行视频解码所需的计算能力，但是一个相关且同样重要的问题是所需的数据带宽，以及需要经济高效地确保足够的数据供应。 MPEG数据集非常大，并且会为标准数据高速缓存生成大量的多余内存流量，最多是解码所需数量的100倍。同时，成本和功率限制限制了嵌入式系统中的缓存大小。包括许多媒体处理器在内的某些系统在数字信号处理器的方式下，通过直接而艰苦的软件控制，消除了缓存，而倾向于存储。然而，MPEG数据具有局部性，如果适当优化，缓存可以利用它，从而提供快速，灵活和自动的数据提供。我们提出了一组针对MPEG解码器工作集中异构类型的特定需求的增强功能。这些优化极大地提高了小型缓存的效率，将缓存内存流量减少了近70％，并且可以使增强的4 KB缓存的性能优于标准的1 MB缓存。这种性能上的改进可以在比wodl更便宜，更小的系统中实现高分辨率，全帧速视频播放，否则将是不可能的。 ！19

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