A cross-layer framework for efficient streaming of H.264 video over IEEE 802.11 networks
Journal of Computer Systems, Networks, and Communications
Real-time H.264 encoder implementation on a low-power digital signal processor
ICME'09 Proceedings of the 2009 IEEE international conference on Multimedia and Expo
Video codec optimizations on cortex A8
WiCOM'09 Proceedings of the 5th International Conference on Wireless communications, networking and mobile computing
An H.264/SVC memory architecture supporting spatial and course-grained quality scalabilities
ICIP'09 Proceedings of the 16th IEEE international conference on Image processing
Operating systems should manage accelerators
HotPar'12 Proceedings of the 4th USENIX conference on Hot Topics in Parallelism
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This paper introduces the performance and technical features of the new generation international video coding standard H.264, as well as discusses the implementation and optimization of H.264 on mobile device. Our work is to implement H.264 Baseline Projile encoder and decoder on an HP IPAQ hx4700 PDA (Personal Digital Assistant) which has a powerful embedded processor PXA27x produced by Intel. By using the way of system optimization, algorithm optimization and instruction optimization, we have successfully implemented the H.264 codec on mobile device and made great improvement in terms of coding speed with very little performance degradation in terms of PSNR and bit-rate. Experimental results show that the speed of our codec increases significantly after optimization (much more than 25 frames per second). In the QCIF (176times144) resolution, our codec can run in real time on the mobile device. Based on our optimized real-time H.264 codec, a wireless video conferencing system is implemented and is described in this paper.