The Research And Application Of P2P-based Mobile Video Interactive System

With the rapid development of today's Internet,there are a variety of video interactive type of system software,the development is an inevitable trend from the PC to the mobile field.In the mobile Internet boom,video interactive system baked slowly in a mobile field,the most relevant mobile products are faced with a small amount of users and SIP-based interactive video system software,which have one thing in common that is forwarding audio and video data on the SIP central server.The contemporary mobile devices' s configuration such as mobile phones,flat-panel etc is almost close to the computer,the demand for interactive video are more widely,performance issues need to be solved in case of large amount of users in the interaction video system,thus in the mobile field,pure C/S model system has not yet satisfied the needs of users.The proposed of mobile video interactive system is based on P2P distributed technology,the technology used in the system's main features such as audio and video features,so that all peer nodes assume the roles of audio and video client or server.This paper studies the related technologies and protocols,such as audio and video codec technology and streaming media protocols?the SIP?SDP protocol etc that related with signaling.Since this system for mobile terminals,and taking into account that the audio and video codec's performance issues,research Android NDK development technology is necessary,whose Native layer implemented codec portion in C++ language.Then the core idea of this system is that a video frame segmentation strategy and a audio mix strategy of mobile video and audio streaming combining with distributed P2P technology,transferred the features to the peer node and remove the forwarding function so as to break the existing C/S bottleneck.Then I design and implement a viable program which transport audio and video in P2P,and according to the UDP heartbeat detection mechanism that dynamically repair P2P fully connected network and video split ratio,which can solve the problem of audio and video playback delay.In the end,the system test and analysis the whole system's modules related to the P2P distributed.Analysis of whether these modules' s functional results is consistent with the expected and analyzes the audio and video strategies used in the fully-connected network based on P2P whether to produce instability of playback delay performance indicators,as well as the network fixed automatically whether impact on the playback of audio and video.