Inter-Destination Media Synchronization (IDMS) Using the RTP Control Protocol (RTCP)

This document defines a new RTP Control Protocol (RTCP) Packet Type and an RTCP Extended Report (XR) Block Type to be used for achieving Inter-Destination Media Synchronization (IDMS). IDMS is the process of synchronizing playout across multiple media receivers. Using the RTCP XR IDMS Report Block defined in this document, media playout information from participants in a synchronization group can be collected. Based on the collected information, an RTCP IDMS Settings Packet can then be sent to distribute a common target playout point to which all the distributed receivers, sharing a media experience, can synchronize. Typical use cases in which IDMS is useful are social TV, shared service control (i.e., applications where two or more geographically separated users are watching a media stream together), distance learning, networked video walls, networked loudspeakers, etc.

本文档定义了一种新的实时传输控制协议（RTCP）数据包类型以及一种RTCP扩展报告（XR）块类型，用于实现目的端间媒体同步（IDMS）。IDMS是在多个媒体接收器之间同步播放的过程。使用本文档中定义的RTCP XR IDMS报告块，可以收集来自同步组中参与者的媒体播放信息。基于所收集的信息，然后可以发送一个RTCP IDMS设置数据包，以分发一个公共的目标播放点，所有共享媒体体验的分布式接收器都可以同步到该点。IDMS有用的典型用例包括社交电视、共享服务控制（即两个或多个地理位置分离的用户一起观看媒体流的应用）、远程教育、联网视频墙、联网扬声器等。