一个AV 同步组的标识
- G:\CDN\rtcCli\m98\src\call\audio_receive_stream.h
// Identifier for an A/V synchronization group. Empty string to disable.
// TODO(pbos): Synchronize streams in a sync group, not just one video
// stream to one audio stream. Tracked by issue webrtc:4762.
std::string sync_group;
同步map
std::map<std::string, AudioReceiveStream*
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