Establishing peer-to-peer streams

When the setup_video() function is called, and the stream is set up successfully, then it is added to peer_connection using the peer_connection.addStream(local_stream) call. This is then ready to be sent to the remote peer automatically once the full RTCPeerConnection is set up successfully.

// setup stream from the local camera
function setup_video() {
  get_user_media(
    {
      "audio": true, // request access to local microphone
      "video": true  // request access to local camera
    },
    function (local_stream) { // success callback
      ...
      // add local stream to peer_connection ready to be sent to the remote peer
      peer_connection.addStream(local_stream);
    },
    log_error // error callback
  );
}

Once the stream from the remote peer is received, then the peer_connection.onaddstream handler is called. This uses the connect_stream_to_src() method defined in the webrtc_polyfill.js code to display the stream in the <video> media...