RTCPeerConnection: addstream event - Web APIs 编辑

Obsolete

This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.

The obsolete addstream event is sent to an RTCPeerConnection when new media, in the form of a MediaStream object, has been added to it.

Important: This event has been removed from the WebRTC specification. You should instead watch for the track event, which is sent for each media track added to the RTCPeerConnection.

You can, similarly, watch for streams to be removed from the connection by monitoring the removestream event.

Examples

This example looks to determine if the user's browser supports the track event. If it does, a track event listener is set up; otherwise, an addstream event listener is set up. pc is an RTCPeerConnection.

if (pc.addTrack !== undefined) {
  pc.ontrack = ev => {
    ev.streams.forEach(stream => doAddStream(stream));
  }
} else {
  pc.onaddstream = ev => {
    doAddStream(ev.stream);
  }
}

This calls a function doAddStream() once for each stream being added to the RTCPeerConnection, regardless of whether the browser sends addstream or track.

You can also use the addEventListener() method to set an event listener:

pc.addEventListener("addstream", ev => doAddStream(ev.stream), false);

Browser compatibility

BCD tables only load in the browser

See also

• WebRTC API
• RTCPeerConnection.onaddstream
• RTCPeerConnection.addStream()
• MediaStreamEvent