在 SIP 视频端点之间共享视频通道上的内容?
是否有多个“m=video”行在具有不同标签 ID 的同一 SDP 中发送的实现?谁能举个例子吗?如果可用,BFCP 协议是否可用于控制除 spkr 或 alt 通道之外的主视频通道?
Are there implementations were multiple "m=video" lines are sent in same SDP with different label ids? Can anyone give an example for it? If available, Can BFCP protocol be used to control the main video channel apart from the spkr or alt channels?
如果你对这篇内容有疑问,欢迎到本站社区发帖提问 参与讨论,获取更多帮助,或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱,如果其他用户或者作者回复了您的评论,将不能在第一时间通知您!
发布评论
评论(1)
有多个“m=video”行在具有不同标签 id 的同一 SDP 中发送的实现。示例是视频会议,其中一位参与者在通话期间共享演示文稿。 SDP 示例:
“slides”是演示流,“main”是主视频流。
流由 SIP 和 BFCP 控制。 BFCP 用于“请求许可”发送第二个流,而 SIP Offer/Answer 模型(即通过 Invite 或 Update 发送 SDP 消息)用于实际打开流。
例如,如果参与者希望开始向其他参与者演示,他首先通过发送 BFCP“发言请求”来请求许可,然后通过发送带有添加新 SDP 的
Re-Invite
来打开流第二行“m=video”。您可以从 IMTC SIP 平价活动组获取更多详细信息:
http://www.imtc.org/uc/sip-parity-activity-组/
There are implementations with multiple "m=video" lines are sent in same SDP with different label ids. Example is Video conference when one of the participants is sharing a presentation during the call. SDP example:
“slides” is the presentation stream and
“main”
is the main Video stream.The streams are controlled by both SIP and BFCP. BFCP is used for “asking permission” to send the second stream, and SIP Offer/Answer model (i.e., sending SDP messages over Invite or Update) for actually open the stream.
For example, if participant wishes to start presenting to other participants, he first asks for permission by sending BFCP “floor request”, and then opens the stream by send a
Re-Invite
with a new SDP adding the second“m=video”
line.You can get more details from IMTC SIP Parity Activity Group:
http://www.imtc.org/uc/sip-parity-activity-group/