The RTCSessionDescription interface describes one end of a connection—or potential connection—and how it's configured. Each RTCSessionDescription consists of a description type indicating which part of the offer/answer negotiation process it describes and of the SDP descriptor of the session.
The process of negotiating a connection between two peers involves exchanging RTCSessionDescription objects back and forth, with each description suggesting one combination of connection configuration options that the sender of the description supports. Once the two peers agree upon a configuration for the connection, negotiation is complete.
The RTCSessionDescription interface doesn't inherit any properties.
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RTCSessionDescription.type Read only
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An enum describing the session description's type.
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RTCSessionDescription.sdp Read only
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A string containing the SDP describing the session.
The RTCSessionDescription doesn't inherit any methods.
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RTCSessionDescription() Deprecated
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This constructor returns a new RTCSessionDescription. The parameter is a RTCSessionDescriptionInit dictionary containing the values to assign the two properties.
RTCSessionDescription.toJSON()-
Returns a JSON description of the object. The values of both properties, type and sdp, are contained in the generated JSON.
signalingChannel.onmessage = (evt) => {
if (!pc) start(false);
const message = JSON.parse(evt.data);
if (message.sdp) {
pc.setRemoteDescription(
new RTCSessionDescription(message),
() => {
if (pc.remoteDescription.type === "offer") {
pc.createAnswer(localDescCreated, logError);
}
},
logError,
);
} else {
pc.addIceCandidate(
new RTCIceCandidate(message.candidate),
() => {},
logError,
);
}
};