RTCPeerConnection.setRemoteDescription()

RTCPeerConnection.setRemoteDescription() 方法改变与连接相关的描述，该描述主要是描述有些关于连接的属性，例如对端使用的解码器。 连接受此更改影响，并且必须能够支持旧的和新的描述。 方法带三个参数，RTCSessionDescription 对象用于设置，然后是更改成功的回调方法，一个是更改失败的回调方法。

方法是异步的，不用等待设置完成，成功会调用成功回调方法，失败则会调用错误回调方法。

连接的offer通常来自于负责匹配的服务器所发送的数据。执行者应调用此方法设置远程描述，然后生成发送到对端计算机的answer。

语法

aPromise = pc.setRemoteDescription(sessionDescription);

pc.setRemoteDescription(sessionDescription, successCallback, errorCallback);

这个方法没有返回值。

参数

sessionDescription

Is a DOMString is the description of the parameters to be applied to the remote session.

successCallback

Is a Function without parameter which will be called when the description has been successfully set. At this point, one can send the offer to a remote server that can forward it to a remote client

errorCallback

Is a RTCPeerConnectionErrorCallback which will be called if the description can't be set. It takes the following parameter:

• errorInformation which is a DOMString describing the reason why the description has not been set.

Example

var pc = new PeerConnection();
pc.setRemoteDescription( new RTCSessionDescription( offer ), function() {
   pc.createAnswer( function( answer ) {
     pc.setLocalDescription( answer, function() {
       // send the answer to the remote connection
    })
  })
});

Specifications

Browser compatibility

[1] Though this property is not prefixed, the interface it belongs to is.

See also

• WebRTC