Abstract
The optimization process of a H.264/AVC encoder on three different architectures is presented. The architectures are multi‐ and singlecore and SIMD instruction sets have different vector registers size. The need of code optimization is fundamental when addressing HD resolutions with real‐time constraints. The encoder is subdivided in functional modules in order to better understand where the optimization is a key factor and to evaluate in details the performance improvement. Common issues in both partitioning a video encoder into parallel architectures and SIMD optimization are described, and author solutions are presented for all the architectures. Besides showing efficient video encoder implementations, one of the main purposes of this paper is to discuss how the characteristics of different architectures and different set of SIMD instructions can impact on the target application performance. Results about the achieved speedup are provided in order to compare the different implementations and evaluate the more suitable solutions for present and next generation video‐coding algorithms.
Highlights
In the last years the video compression algorithms have played an important role in the enjoying of multimedia contents
The compression algorithm used in DVDs is MPEG-2, and Blu-Ray supports VC-1 standardized with the name SMPTE 421M [1], in addition to MPEG-2 and H.264
This paper presents efficient implementations of the H.264/AVC encoder on three different instruction set architectures (ISAs)
Summary
In the last years the video compression algorithms have played an important role in the enjoying of multimedia contents. The passage from analog to digital world in multimedia environment cannot be performed without compression algorithms. DVDs, Blu-Ray, and Digital TV are typical examples. The compression algorithm used in DVDs is MPEG-2, and Blu-Ray supports VC-1 standardized with the name SMPTE 421M [1], in addition to MPEG-2 and H.264. The compression algorithms are used to reduce the transmission throughput. In DVB-T, the picture format for DVD and Standard Definition TV (SDTV) is 720 × 576, and this resolution is the most used in digital multimedia contents. The most recent standards for digital television as DVB-T2 and DVB-H support H.264/MPEG-4 AVC for coding video
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