基于IPTV的电视机顶盒内嵌流媒体播放器同步机制的设计与实现

Design and Implement of the Synchronization Mechanism for the Streaming Media Player Embedded in TV Box Based on IPTV

在面向IPTV的使用与推广中,终端设备———电视机顶盒内嵌播放器的设计至为关键,在通常的设计中流媒体播放器是将视音频数据包中的时间戳互相比较,以决定视音频帧何时应该被解码播放,在采用这种机制的播放器中视音频流相互依赖。为了避免视音频流之间的相互依赖,本文提出了一种新的将系统时间与视音频时间戳各自相比较的同步机制,在实际使用中证实,通过采用该机制,流媒体播放器达到了精确的无依赖的同步。

Face the using and spread of IPTV, the most important thing is the design of streaming media player in the box on TV. Usually the video and audio streams are interdependent in streaming media players which adopt this synchronizing mechanism, i.e. compare the timestamps in video and audio packets to determine when the video and audio frames should be decoded. To avoid their interdependence, this thesis presents a new synchronizing mechanism, which respectively compares system time with the timestamps in video and audio packets. Through practical application, it has been proved that media players can achieve precise and independent synchronization by adopting this mechanism.