simple publisher / subscriber stream

// writeln(  ) replaces trace(  ) and writes messages into the trace_txt field.
function writeln (msg) {
 trace_txt.text += msg + "\n";
 trace_txt.scroll = trace_txt.maxscroll;
}

// onStatus( ) sets up the streams and buttons when a connection is
// established or lost.
NetConnection.prototype.onStatus = function (info) {
 writeln("Level: " + info.level + ", code: " + info.code);
 if (info.code == "NetConnection.Connect.Success") {
   out_ns = new NetStream(this);
   out_ns.attachAudio(Microphone.get( ));
   out_ns.attachVideo(Camera.get( ));
   in_ns = new NetStream(this);
   in_ns.showMessage = function (msg) {
     writeln(msg);
   };
   // remote_video is the instance name of an embedded video object.
   remote_video.attachVideo(in_ns);
   in_ns.play("public/" + remoteUserName);
   connect_pb.setLabel("Disconnect");
   send_pb.setEnabled(true);
 }
 else if (!this.isConnected) {
   if (out_ns) out_ns.close( );
   if (in_ns) in_ns.close( );
   connect_pb.setLabel("Connect");
   send_pb.setEnabled(false);
 }
};

NetStream.prototype.onStatus = function (info) {
 for (var p in info) {
   writeln("info." + p + ": " + info[p]);
 }
};

// doSend( ) is called when the send_pb is clicked.
function doSend (msg) {
 out_ns.send("showMessage", input_txt.text);
 input_txt.text = "";
}

/* doConnect( ) is called when the connect_pb is clicked.
 * It stores the text in the userName_txt and remoteUserName_txt
 * fields in global variables for later use if a connection is
 * attempted. See the onStatus( ) method.
 */
function doConnect (pb) {
 if (pb.getLabel( ) == "Connect") {
   userName = userName_txt.text;
   remoteUserName = remoteUserName_txt.text;
   nc.connect("rtmp:/courseChat/algebra101", userName);
 }
 else {
   nc.close( );
 }
}

function doSendStream (pb) {
 if (pb.getLabel( ) == "Send Stream" && nc.isConnected) {
   pb.setLabel("Stop Stream");
   out_ns.publish("public/" + userName);
 }
 else {
   pb.setLabel("Send Stream");
   out_ns.publish(false);
 }
}

send_pb.setEnabled(false);
nc = new NetConnection( );