The information of the destination channel. See ChannelMediaInfo
It contains the following properties:
channel: The name of the destination channel.token:Token for joining the destination channel. It is generated
                    with channel and uid you set in
                    destInfos.
                    uid: ID of the host in the destination channel. The value ranges
                    from 0 to 232-1. To avoid UID conflicts, this uid must
                    be different from any other UIDs in the destination channel. The default value
                    is 0, which means the SDK randomly generates a UID.
                  The information of the source channel. See ChannelMediaInfo
It contains the following properties:
Note:
                      channel: The name of the source channel. The default value is
                      NULL, which means that the SDK passes in the name of the current channel.
                    
                      token: Token for joining the source channel. It is generated with
                      channel and uid you set in srcInfo. The
                      default value is NULL, which means that the SDK passes in the APP ID.
                    
uid:
The configuration of the media stream relay.
Warning: