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Rockbox mail archiveSubject: GSoC 2010 ProjectsGSoC 2010 Projects
From: Michael Purwins <mpurwins_at_gmail.com>
Date: Sun, 30 Jan 2011 13:08:36 +0000 Hi, my name is Michael Purwins and I am currently doing my masters degree in Software Engineering at Dublin City University in Ireland. I was browsing the Google Summer of Code project ideas from 2010 to find a suitable idea for my practicum. The two topics below caught my eye. Is one of them still available? *MP3 Codec Optimization* Rockbox has a fixed point MP3 decoder based on libmad. Unfortunately libmad is not particularly fast even after extensive optimization. For example, on ARM7TDMI?, Rockbox uses 38MHz for 128k MP3. The official ARM decoder uses 29MHz, a difference of almost 25%. Other libraries exist for decoding mp3, each with their own strengths and weaknesses. In this project, a student would explore the performance of each of the major components of our decoder and then evaluate possible replacements in other codec libraries (ffmpeg, etc) or implement their own code based on algorithms in the literature. The goal would be to produce a decoders using either the best known algorithm or best known open source code for each step in the decoding process. The resulting improvements to Rockbox would reduce power consumption and provide the open source community with substantially more efficient embedded MPEG codecs. *Codec Library and Optimization* Create a stand alone command line version of the rockbox codec api functions so that rockbox codecs can be compiled and tested outside of rockbox, much as ffmpeg codecs can be tested from the command line. Then optimize codecs in order to fit into certain memory or CPU usage goals. Introduce standard, optimized library functions for common tasks to complement the existing IMDCT library (such as bitstream parsing, huffman decoding, etc). The goal of this project would be to improve the performance and memory usage of rockbox codecs, while making them accessible to other embedded projects. Some background information: I am German and graduated in computer engineering at Hamburg University of Technology. To be honest my knowledge about audio codecs is limited. However, I am very interested in low-level optimisation and willing to acquire all the needed skills. My bachelor thesis was on cache optimisation for image processing algorithms on Intel X86 architectures. I was able to increase the performance of some algorithms by more than 40%. Best Regards, Michael Received on 2011-01-30 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |