Optimizing Off-Chip Memory Access Costs in Low Power MPEG-4 Decoder

A4 Konferenspublikationer


Interna författare/redaktörer


Publikationens författare: Habli H, Ersfolk J, Lilius J, Westerlund T, Nurmi J
Publiceringsår: 2012
Förläggare: ACM Press
Moderpublikationens namn: 3rd International Conference on Information and Communication Systems
Antal sidor: 5
ISBN: 978-1-4503-1327-8


Abstrakt

One of the main sources for energy consumption in modern video coding algorithms is caused by reading reference frames from main memory. Once a reference frame block is in the local memory, we need to predict in advance when the same reference frame block would be reread from the main memory. The prediction relies on the calculation of motion vectors according to their absolute addresses. The reduction of the number of read accesses can be attained by calculating which motion vectors point to a part of the reference frame that can be copied to a local memory. This increases data locality, and thus reduces energy consumption. The optimized memory access algorithm was integrated into low power MPEG-4 decoder architecture [1, 2] and modeled using SystemC. A cycle accurate model simulation with optimized algorithm showed an average of 10% increase on runtime performance compared to an unoptimized typical video decoding algorithm.


Nyckelord

fine-grained, heterogeneous, low power, Memory access, motion vector, reusable data, video decoder

Senast uppdaterad 2019-19-09 vid 05:52