在开源PJSIP协议栈的基础上,应用TI公司推出的低功耗高性能的OMAP-L138处理器,提出了PJProject源码移植的方法,并将影响系统性能的iLBC Codec移植到DSP端实现,利用DSPLINK开发包完成ARM和DSP的双核通信,从而实现了SIP-UA的基本功能.实验结果表明,PJMEDIA中的echo canceller和不同的采样率是影响系统的两大因素,同时还比较了定点和浮点运算对系统性能的影响.%According to TI' s low-power and high-performance applications processor OMAP-L138, a SIP-UA terminal system is implemented based on an open source PJSIP. This paper provides a method of transplanting PJProject program code to OMAP-L138, especially shows how to transplant iLBC Codec system-performance affected to DSP endpoint with DSPLINK tools which implement the communication and control between ARM and DSP. The experimental results show that echo canceller module and different sample rates in PJMEDIA are the most significant factors which affect system performance. Meanwhile, the influence of system on between fixed point and float computing is also analyzed in this paper.
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