createSender

Creates an RtpSender without a track.

This method allows an application to cause the PeerConnection to negotiate sending/receiving a specific media type, but without having a track to send yet.

When the application does want to begin sending a track, it can call RtpSender.setTrack, which doesn't require any additional SDP negotiation.

Example use:

audioSender = pc.createSender("audio", "stream1");
videoSender = pc.createSender("video", "stream1");
// Do normal SDP offer/answer, which will kick off ICE/DTLS and negotiate
// media parameters....
// Later, when the endpoint is ready to actually begin sending:
audioSender.setTrack(audioTrack, false);
videoSender.setTrack(videoTrack, false);

Note: This corresponds most closely to "addTransceiver" in the official WebRTC API, in that it creates a sender without a track. It was implemented before addTransceiver because it provides useful functionality, and properly implementing transceivers would have required a great deal more work.

Note: This is only available with SdpSemantics.PLAN_B specified. Please use addTransceiver instead.

Parameters