RTCPeerConnection.onaddstream

Deprecated: This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

The RTCPeerConnection.onaddstream event handler is a property containing the code to execute when the addstream event, of type MediaStreamEvent, is received by this RTCPeerConnection. Such an event is sent when a MediaStream is added to this connection by the remote peer. The event is sent immediately after the call setRemoteDescription() and doesn't wait for the result of the SDP negotiation.

Warning: This property has been removed from the specification; you should now use RTCPeerConnection.ontrack to watch for track events instead. It is included here in order to help you adapt existing code and understand existing samples, which may not be up-to-date yet.

Syntax

rtcPeerConnection.onaddstream = eventHandler;

Value

A function which handles addstream events. These events, of type MediaStreamEvent, are sent when streams are added to the connection by the remote peer. The first time an event occurs may be nearly immediately after the remote end of the connection is set using RTCPeerConnection.setRemoteDescription(); it doesn't wait for a particular stream to be accepted or rejected using SDP negotiation.

Example

This code, based on an older version of our Signaling and video calling sample, responds to addstream events by setting the video source for a <video> element to the stream specified in the event, and then enabling a "hang up" button in the app's user interface. 

pc.onaddstream = function(event) {
  document.getElementById("received_video").srcObject = event.stream;
  document.getElementById("hangup-button").disabled = false;
};

You can also use addEventListener() to add a handler for addstream events to an RTCPeerConnection.

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
onaddstream
24
15
22
No
15
11-12
≤37
25
44
14
11-12
1.5

Warning: This property has been removed from the specification; you should now use RTCPeerConnection.ontrack to watch for track events instead. It is included here in order to help you adapt existing code and understand existing samples, which may not be up-to-date yet.

See also

© 2005–2021 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/RTCPeerConnection/onaddstream