The Design And Implementation Of Audio Stream Processing System Based On EUMP

As a new communication tool of the Internet age,the video conference system made the users feel the immersive feeling through the technology of audio and video,which was widely used in every trade today.The soft-only media processing server based on X86 server whose performance gets improving gradually became the development trend of media processing products,with advantages of the universal deployment management,easy to transplant and low costing.Using the soft-only scheme based on X86 server as a basic platform,eUMP is the public power platform for media product soft enterprise communication.It can meet the requirements of the media products such as the video conference severs.In this thesis,there were not only some analyses about the related key technologies,such as the basic principle of video conference system and the audio codec and mixing technology,so as to find the methods audio processing which used by the eUMP platform,but also accomplishing the design of audio stream processing system based on eUMP.The main work included:(1)As to RTP and RTCP protocol and adaptive jitter buffer,sending and receiving module of the audio stream was designed and realized.And the real-time audio playing problem of intermittent and distortion which caused by jitter and packet loss was solved.(2)For the problem of large audio data in network transmission,it based on X86 platform AAC_LD protocol components that implemented coding and decoding of audio stream data,and used the PLC technology to simulate the lost packets.(3)Based on two kinds of mixing method and common mixing algorithm researching,there was a designed scheme for audio mixing,which realized the operation of mixing various audio stream,and supported dynamic change of maximum number of mixing.(4)According to the different ways to sending DTMF signal,the module was designed and implemented for sending and detecting DTMF signal.Moreover,IVR's operating in the audio stream were achieved.For the implementation of the system as a result,there are also designments of the detailed LLT testing scheme in this paper.Test results showed that the system had fully functional and stable running,basically meeted the application requirements of enterprise-level video conference,and it passed the acceptance project iteration.