BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Need several fresh ideas          BorlandTalk.com Forum Index -> Delphi Internet Winsock View previous topic :: View next topic   Author Message Georgi Sandev Guest Posted: Thu Apr 29, 2004 9:31 am    Post subject: Need several fresh ideas Hello I need several ideas about the following: I have to make an application very similar to Yahoo Messanger - i.e. it has to provide users with the ability to chat in a public room and also to be able to speak to each other and view each other - i.e. This application is supposed to make audio and video transmission. Now according to the text chatting I have no problems. I am using Indy and I have organized a server application that is listening on a port and accepts users messages and broadcast them to the other users. This is OK. Here are my dificulties: I am not quite sure how I have to organize the audio and video transmission. If I follow the Yahoo Messanger ideas I am supposed to make point to point A/V streaming - i.e. when User1 requests to view User2's web cam User2 must open a port and to start broadcast his video on this port i.e. User2 two becomes a server and User1 connects directly to it. Is it a good idea to use this approach or you have some other better ideas? Also - what will happen if User2 is behind a proxy and his real IP address is masked? I would appreciate all your experience and you ideas about this and also about the way how to design such an application. Please note here that my questions are not concerning the actual A/V streaming techniques (I am using DSPack for this) but they are more design-oriented. Thanks Back to top Ioan Ghip Guest Posted: Thu Apr 29, 2004 4:45 pm    Post subject: Re: Need several fresh ideas Quote: Also - what will happen if User2 is behind a proxy and his real IP address is masked? then you connect both users using a central server, same way you do with text messages and send from one user to the other one just jpeg images as fast as you can -ioan Back to top Georgi Sandev Guest Posted: Thu Apr 29, 2004 4:50 pm    Post subject: Re: Need several fresh ideas Thanks. I thought about this approach but I think that this will increase the delay because of the one extra point - i.e. the server. "Ioan Ghip" <delphi5eAThotmailDOTcom> wrote Quote: Also - what will happen if User2 is behind a proxy and his real IP address is masked? then you connect both users using a central server, same way you do with text messages and send from one user to the other one just jpeg images as fast as you can -ioan Back to top Ioan Ghip Guest Posted: Thu Apr 29, 2004 5:01 pm    Post subject: Re: Need several fresh ideas Quote: Thanks. I thought about this approach but I think that this will increase the delay because of the one extra point - i.e. the server. I think is the only way to do it if the user who braodcast the video is behind a proxy firewall. I think Yahoo is doing in the same way, only in super mode I think the video connection is point to point, all other conections are using a central server (you can see this in webcam's connection statistics). -ioan Back to top Tony Caduto Guest Posted: Thu Apr 29, 2004 6:20 pm    Post subject: Re: Need several fresh ideas Here is what you could do. Since you are creating and controling the client and server it's easy to determine if they are behind a proxy/router. during the connection/logon to your directory server etc, pass the clients local IP address and compare it with the peer IP address at the server. If they are the same the user is not behind a router/firewall/proxy, if they are different then they are. If they are behind a firewall etc the peer IP will be the address of the firewall. You can then tell the client to route all communications to other users via the server instead of point to point. It works well, and I have clients with 300+ users on conncurently using this method. I am not doing the video/audio though. -- Tony Caduto AM Software Design Inexpensive Corporate Instant Messaging http://www.amsoftwaredesign.com Back to top Georgi Sandev Guest Posted: Fri Apr 30, 2004 5:19 am    Post subject: Re: Need several fresh ideas Thanks. I'll think about this one "Tony Caduto" <acaduto (AT) amsoftwaredesign (DOT) com> wrote Quote: Here is what you could do. Since you are creating and controling the client and server it's easy to determine if they are behind a proxy/router. during the connection/logon to your directory server etc, pass the clients local IP address and compare it with the peer IP address at the server. If they are the same the user is not behind a router/firewall/proxy, if they are different then they are. If they are behind a firewall etc the peer IP will be the address of the firewall. You can then tell the client to route all communications to other users via the server instead of point to point. It works well, and I have clients with 300+ users on conncurently using this method. I am not doing the video/audio though. -- Tony Caduto AM Software Design Inexpensive Corporate Instant Messaging http://www.amsoftwaredesign.com Back to top Dan F Guest Posted: Fri Apr 30, 2004 10:21 pm    Post subject: Re: Need several fresh ideas "Georgi Sandev" <georgi_sandev (AT) atianet (DOT) bg> wrote Quote: Thanks. I'll think about this one "Tony Caduto" <acaduto (AT) amsoftwaredesign (DOT) com> wrote in message news:40914754 (AT) newsgroups (DOT) borland.com... Here is what you could do. Since you are creating and controling the client and server it's easy to determine if they are behind a proxy/router. during the connection/logon to your directory server etc, pass the clients local IP address and compare it with the peer IP address at the server. If they are the same the user is not behind a router/firewall/proxy, if they are different then they are. If they are behind a firewall etc the peer IP will be the address of the firewall. You can then tell the client to route all communications to other users via the server instead of point to point. It works well, and I have clients with 300+ users on conncurently using this method. I am not doing the video/audio though. -- Tony Caduto AM Software Design Inexpensive Corporate Instant Messaging http://www.amsoftwaredesign.com If you are using TCP and only one person is behind a firewall/router as detected by the method above, then just have the person who is behind the router connect to the open user. If both are behind routers you will have to go through the server. You might also want to look into the Windows XP UPnP NAT API which allows programs behind UPnP routers to forward ports and determine their external IP. 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