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Question

I am developing a chat application and done with it. Now I want to implement video chat also. After research a lot I decided to go with "WebRTC" library.

What I have done?

1) Able to run AppRtcDemo at local server and Its working fine between browsers.

Reference : http://www.webrtc.org/reference/getting-started

2) Able to build Android AppRtcDemo.But when I run it say "Cross origin does not support".

After research I found in webrtc discussion that to resolve this issue I need to set-up own turn server.

3) So I install latest rfc5766TurnServer recommended by webrtc. I got success to run turn server.

Reference : http://code.google.com/p/rfc5766-turn-server/

I do following changes to ApprtcDemo (web) and (Android) to work with my Turn server

1) apprtc.py

Replace:

turn_url = 'https://computeengineondemand.appspot.com/'
turn_url = turn_url + 'turn?' + 'username=' + user + '&key=4080218913'

With point to my turn server:

turn_url = 'http://192.168.5.85:3478/?service=turn&username=biraj'

2) index.html

Replace:

var pcConfig = {{ pc_config|safe }};

With:

var pcConfig = {"iceServers": [{"url": "stun:stun.l.google.com:19302"},            {"url":"turn:biraj@192.168.5.85:3479", "credential":"0x5b04123c3eec4cf0be64ab909bb2ff5b"}]};

Android

1)AppRTCDemoActivity.java

Replace:

roomInput.setText("https://apprtc.appspot.com/?r=");

With my local apprtc server:

roomInput.setText("http://192.168.5.86:8080/?r=");

2) AppRTCClient.java

In private PeerConnection.IceServer requestTurnServer(String url){} function

Replace:

connection.addRequestProperty("origin", "https://apprtc.appspot.com");

With:

connection.addRequestProperty("origin", "http://192.168.5.86:8080");

3) /assets/channel.html

Replace:

<script src="https://apprtc.appspot.com/_ah/channel/jsapi"></script>

With:

<script src="http://192.168.5.86:8080/_ah/channel/jsapi"></script>

Now my question is why this is working between browsers but not between android AppRtcDemo and browser.

When I run AppRtcDemo on android after doing above changes local camera preview is started at right-top corner and message prompt "waiting for ICEcandidates" then nothing happens.

Thanks in advance.

Thanks to All for supporting my question.After long rocky ride with ApprtcDemo I got success and it works fine.I am posting the solution.

Find the "GAEChannelClient.java" java file.

and do change as below.

/*
 * libjingle
 * Copyright 2013, Google Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  1. Redistributions of source code must retain the above copyright notice,
 *     this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright notice,
 *     this list of conditions and the following disclaimer in the documentation
 *     and/or other materials provided with the distribution.
 *  3. The name of the author may not be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.appspot.apprtc;

import java.io.InputStream;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.util.Log;
import android.webkit.ConsoleMessage;
import android.webkit.JavascriptInterface;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;

/**
 * Java-land version of Google AppEngine's JavaScript Channel API:
 * https://developers.google.com/appengine/docs/python/channel/javascript
 * 
 * Requires a hosted HTML page that opens the desired channel and dispatches JS
 * on{Open,Message,Close,Error}() events to a global object named
 * "androidMessageHandler".
 */
public class GAEChannelClient {
    private static final String TAG = "GAEChannelClient";
    private WebView webView;
    private final ProxyingMessageHandler proxyingMessageHandler;

    /**
     * Callback interface for messages delivered on the Google AppEngine
     * channel.
     * 
     * Methods are guaranteed to be invoked on the UI thread of |activity|
     * passed to GAEChannelClient's constructor.
     */
    public interface MessageHandler {
        public void onOpen();

        public void onMessage(String data);

        public void onClose();

        public void onError(int code, String description);
    }

    /** Asynchronously open an AppEngine channel. */
    @SuppressLint("SetJavaScriptEnabled")
    public GAEChannelClient(Activity activity, String token, MessageHandler handler) {
        webView = new WebView(activity);

        webView.getSettings().setJavaScriptEnabled(true);
        webView.getSettings().setAllowFileAccessFromFileURLs(true); // Maybe you
                                                                    // don't
                                                                    // need this
                                                                    // rule
        webView.getSettings().setAllowUniversalAccessFromFileURLs(true);

        webView.setWebChromeClient(new WebChromeClient() { // Purely for
                                                            // debugging.
            public boolean onConsoleMessage(ConsoleMessage msg) {
                Log.d(TAG, "console: " + msg.message() + " at " + msg.sourceId() + ":" + msg.lineNumber());
                return false;
            }
        });
        webView.setWebViewClient(new WebViewClient() { // Purely for debugging.
            public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
                Log.e(TAG, "JS error: " + errorCode + " in " + failingUrl + ", desc: " + description);
            }

            @Override
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                System.out.println("HI");
                return super.shouldOverrideUrlLoading(view, url);
            }
        });

        proxyingMessageHandler = new ProxyingMessageHandler(activity, handler, token);
        webView.addJavascriptInterface(proxyingMessageHandler, "androidMessageHandler");
//       webView.loadUrl("file:///android_asset/channel.html");
        try {
            InputStream is = activity.getAssets().open("channel.html");
            StringBuilder builder = new StringBuilder();
            byte[] buffer = new byte[1024];
            while (is.read(buffer) != -1) {
                builder.append(new String(buffer));
            }
            is.close();
            String str = builder.toString();
            webView.loadDataWithBaseURL("http://192.168.5.86:8080", str,"text/html","utf-8",null);}catch(Exception e){
            e.printStackTrace();}}/** Close the connection to the AppEngine channel. */publicvoid close(){if(webView ==null){return;}
        proxyingMessageHandler.disconnect();
        webView.removeJavascriptInterface("androidMessageHandler");
        webView.loadUrl("about:blank");
        webView =null;}// Helper class for proxying callbacks from the Java<->JS interaction// (private, background) thread to the Activity's UI thread.privatestaticclassProxyingMessageHandler{privatefinalActivity activity;privatefinalMessageHandler handler;privatefinalboolean[] disconnected ={false};privatefinalString token;publicProxyingMessageHandler(Activity activity,MessageHandler handler,String token){this.activity = activity;this.handler = handler;this.token = token;}publicvoid disconnect(){
            disconnected[0]=true;}privateboolean disconnected(){return disconnected[0];}@JavascriptInterfacepublicString getToken(){return token;}@JavascriptInterfacepublicvoid onOpen(){System.out.println("GAEClient : Open");
            activity.runOnUiThread(newRunnable(){publicvoid run(){if(!disconnected()){
                        handler.onOpen();}}});}@JavascriptInterfacepublicvoid onMessage(finalString data){System.out.println("GAEClient : Message : "+data );
            activity.runOnUiThread(newRunnable(){publicvoid run(){if(!disconnected()){
                        handler.onMessage(data);}}});}@JavascriptInterfacepublicvoid onClose(){System.out.println("GAEClient : Close");
            activity.runOnUiThread(newRunnable(){publicvoid run(){if(!disconnected()){
                        handler.onClose();}}});}@JavascriptInterfacepublicvoid onError(finalint code,finalString description){System.out.println("GAEClient : Erroe : "+ description);
            activity.runOnUiThread(newRunnable(){publicvoid run(){if(!disconnected()){
                        handler.onError(code, description);}}});}}}

Channel.html in assets folder

<html>
  <head>
    <script src="http://192.168.5.86:8080/_ah/channel/jsapi"></script>
  </head>
  <!--
  Helper HTML that redirects Google AppEngine's Channel API to a JS object named
  |androidMessageHandler|, which is expected to be injected into the WebView
  rendering this page by an Android app's class such as AppRTCClient.
  -->
  <body onbeforeunload="closeSocket()" onload="openSocket()">
    <script type="text/javascript">
      var token = androidMessageHandler.getToken();
      if (!token)
        throw "Missing/malformed token parameter: [" + token + "]";

      var channel = null;
      var socket = null;

      function openSocket() {
        channel = new goog.appengine.Channel(token);
        socket = channel.open({
          'onopen': function() { androidMessageHandler.onOpen(); },
          'onmessage': function(msg) { androidMessageHandler.onMessage(msg.data); },
          'onclose': function() { androidMessageHandler.onClose(); },
          'onerror': function(err) { androidMessageHandler.onError(err.code, err.description); }
        });
      }

      function closeSocket() {
        socket.close();
      }
    </script>
  </body>
</html>

Will you provide the logs during android and web communication. – Ichigo Kurosaki Jan 18 at 8:01 — Ichigo Kurosaki, Jan 18 at 8:01
@Biraj Zalavadia: like you have spend 1 month, i have lost 3 month still could not make it work, you mentioned your modification worked for you but i did exactly like you have shown which never worked for me. Could you please also join on my link here: stackoverflow.com/questions/23949237/… – YumYumYum May 30 at 7:28 — YumYumYum, May 30 at 7:28
@hushao asks "[H]ow do you create you[r] local server? [Is it] the same [as] apprtc.appspot.com "? – drs Jul 22 at 1:28 — drs, Jul 22 at 1:28

MarijnS95 · Answer 1 · 2014-01-18 22:35:54Z

Sadly I don't know if you have done these things:

Use the SAME stun and turn server on every application (wether PC or mobile).
Are you even sending the ICE candidates between the applications (I think you do, but just to verify).
Are you sure that the STUN/TURN url are the ones that give the error, as I can't believe that these things do about cross-origins (they shouldn't, as you are just connecting from a client to a server. Cross origin is mostly 'used' on web pages that load data from an external source. You aren't allowed to do that from an XHR). I am really thinking it has something to do with https://apprtc.appspot.com/_ah/channel/jsapi, as this is a good example of cross origin stuff.

What if you open the web page that is working in your chrome browser on mobile? What does it do then? (note that you can connect your phone to your pc to have the full developer tools chrome has. Chrome runs on your android device but you can see the devtools on your pc).

If you can provide me these answers I might be able to help you. Try to revert all those changes and just use google's TURN server, but only make that https://apprtc.appspot.com/_ah/channel/jsapifile local.

EDIT: I see you found your answer. Would you mind to share it?

I added the javascript inside the html file instead of loading via network. But still not working. Can you please help, nobody is sharing details who made it work. – YumYumYum May 28 at 15:51 — YumYumYum, May 28 at 15:51
@YumYumYum What exactly is not working? I have seen that the OP has found an answer but I have no idea what. – MarijnS95 May 28 at 16:54 — MarijnS95, May 28 at 16:54
@MarjinS95: Actually what OP has reported here and on other url i have done exactly same + spend more then 1 month on it, and its not working like OP said it was. My problem is in AppRTCDemo when i execute to connect with local setup, it does not do anything after joining the room. if you want should i open a new question related to this and link you that please? I think you are the only person who understood this issue, most of all others are very confused. – YumYumYum May 29 at 14:56 — YumYumYum, May 29 at 14:56
@YumYumYum Opening a new question would be nice (you can add some more details, maybe even some logging about what functions are executed and what not). I am mainly a javascripter, no java'er, so I have not that much knowledge about it but do understand most of it. I'd also like to see some url's you are using to find out if you have any cross-origin problems too. – MarijnS95 May 29 at 15:07 — MarijnS95, May 29 at 15:07
OK - i will do that, but i believe you can solve it. Most of the related issues were ignored by many other experts. But it think its more JavaScript related problem, i will create a new question about this with every details and step by step i took. Then inform you here today. Thanks a lot for your support, i really appreciate it. – YumYumYum May 29 at 15:13 — YumYumYum, May 29 at 15:13

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如何使官方提供的AppRTCDemo 运行在自己搭建的server（官方提供的apprtc）上（官方的server源码）

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