《一种多媒体会议系统的实时同步溷音转发算法》.pdf

49 2 ( ) Vol149 No1 2 2010 3 ACTA SCIENTIARUM NATURALIUM UNIVERSITAT IS SUNYATSENI M ar1 2010 * 一种多媒体会议系统的实时同步混音转发算法 1 2 2 2 李 宇, 郭雷勇 , 陈建铭 , 谭洪舟 ( 1. 广东药学院医药信息工程学院, 广东 广州510006; 2. 中山大学信息科学与技术学院, 广东 广州5102 5) : , , Perk ins, , , , : ; ; ; ; : TN91918 : A : 0529- 65 9 ( 2010) 02- 0031- 06 A Real-T im e Synchronou s Audio M ix ing and T ransm itting Sch em e in M u ltim edia Conferen ce System 1 2 2 2 L I Yu , GUO L eiyong , CHEN J ianm ing , TAN H ongzhou ( 1. College ofM ed ical Information Engineering, Guangdong Pharm aceuticalUn iversity, Guangzhou 510006, Ch ina; 2. School of Information Science and Technology, Sun Yat-sen Un iversity, Guangzhou 5102 5, Ch ina) Abs tract: The aud io m ixing algorithm determ ines the quality of the m ixing voice in the unicast based centralizedmultmi edia conference system. How ever, the mi p lem entation of them ixing algorithm is based on the backup of synchronous aud io m ixing and transm itting mechan ism. The circu lar m ixing buffer ( CM B) proposed by Perkins is analyzed, and then a rea-l tmi e synchronous audiom ixing and transm itting scheme is presented. This scheme is ach ieved by settingmu lti-CMBs and controlling them synchronously. The length of data used form ixing is decided by the one of data storing in the soundcard bufferw hich re- flects operating system ( OS) schedu ling. Th is can alleviate the influence of OS scheduling o