I am new to socket programing. I have to make an app for android which should stream video to the web. I have read about this on various website and all say to use socket.
Is socket required to do this? I mean is there any other way of doing this without socket?
By Google, I found various methods some of which uses socket and some other not. There are also various protocols available which is specially meant for streaming purpose such as rtpm, rtsp, etc. One can also use http to do the same.
Related
I would like to implement a voice chat (even just a primitive support for it), without the hassle of implementing the whole VoIP stack. I would also like to make it available to both iOS and Android.
I have been searching for a way to do this, and it just seems to me that using Socket.IO would be something to start with. Is it possible to use Socket.IO as a signalling server (to discover who is available, and who to start a voice chat with), and then establish a peer-to-peer connection between two devices in order to transfer audio data?
NOTE: Although I would prefer peer-to-peer, because I would like to avoid overloading the server with transferring such an enormous amount of data, is it possible to have socket.io receiving and transmitting audio data between devices (because I heard that iOS and Android cannot establish a P2P connection with one another). If it's not possible, then maybe it's possible to use a socket.io server as an intermediary for sending audio data?
I found the following helpful links (which are probably based on socket.io) but they have not any reference for mobile devices.
http://peerjs.com/
https://simplewebrtc.com/
Any help is greatly appreciated. Any alternatives to socket.io, are also accepted, if there are any.
I want to create an app that can send and receive files like text and images between multiple users in android without any net connections. Just to create a local server in one device and use it as a hotspot for transmission of data.
Any suggestions?
You can do this by using socket programming.
https://docs.oracle.com/javase/tutorial/networking/sockets/
In nut shell, The device which you would like to make as server should create a server socket and continue listening to a port. All client devices can create a client socket and connect to the server socket and transmit data.
You can refer to the sample app "Bluetooth Chat" which is available with Android sdk sample. You can use the same concept to transfer files as chunks of bytes (part by part).
Good luck!!
Start with basics
(https://en.wikipedia.org/wiki/Communications_protocol)
Think about what you want to achieve.
Choose your protocol or technology (HTTP, FTP, REST, UPnP or
thousand-others)
Then move on to implementation. You are likely to use some existing library.
Imagine someone is broadcasting an audio or video world wide through WebRTC i.e one to many communication (app like periscope which i think is not done using WebRTC). Will it get affected by the broadcasters less bandwidth ? will it increase the load on broadcaster side causing loss of packets which will decrease quality of communication ? As this topic is new and very little content is available on net please suggest some good books and online tutorials.
WebRTC facilitates peer to peer communication. Going by this login a simple WebRTC broadcast application will heavily depend on broadcaster's bandwidth as the number of recipients will be same to the number of outbound media streams.
This is one of the main reasons why WebRTC Gateways or Media Servers or similar terms have been developed. In this case the broadcaster simply sends a single stream to the intermediary Gateway or Server and the other recipients then connect to the Gateway or Server and receive the stream from there.
To put it in simple terms, you basically add a central WebRTC client to which everyone connects.
You can read more at Janus, Kurento, Licode, etc.
Or find official RTCPeerConnection documentation here.
I'm trying to develop a proyect like PTTDroid, I mean a Push-To-Talk or Walkie-Talkie application.
The issue is that in this app you can´t use 3G to access the web, so I've decided to use a Node.js server and implement an Android client to comunicate with it. I tried to do a multiplattform proyect using Phonegap the problem is that for audio record you can't access to buffer, you can only start and stop or pause the recording process but not send data while capturing. So my problem is that is possible to streams audio capture in real time by native Android functions (Audiorecord class) with a Node.js server by Socket.IO or similar?
I discovered this project, Asimi JS, but I don't know if someone else knows a better way to do what I want.
Thank you very much for your help!
It is certainly possible to do it, but a standard NodeJS http server would not be advisable as it uses tcp. You want to use UDP as a transport layer for audio, since it will be faster and the small packet loss that can occur will most likely not be a problem.
To be completely honest with you it sounds like you need to write a few demo applications on the native platforms - so do not use phonegap. You need native platforms in order to access things suchs as the mircrophone and to stream over UDP.
When you have a demo working, you can go on and try with another platform afterwards, but start with a simple setup instead of trying to do it all at once - if it was that easy, someone else would have done it before you.
Let me recommend a simple UDP server in whatever language you are most comfortable with such as (NodeJS, Java, C, C++, C#). Let the UDP server receive and save the content into a file that you can then play back on a desktop computer to verify the result. As a simple client, build one either on Android or iOS, and stream a file that you have already recorded and included in the app. When you have this setup working, you can try to capture the microphone, then do a user interface, then support multiple phones, then build a server which records the conversations, then build a user database, and so on a so forth. But start with a prototype of your main feature.
I've finally discovered and solved my problem (at least that's what I think)...First of all I created a server to send and receive UDP packets by DatagramSocket and after that, to achieve communication between server and client, when I was connected by 3G, I needed to have a static port and IP, that's why my server couldn't connect with the client. With data connection, the user IP and port is not always the same and you have to keep the same socket always opened if you want to send and receive. On the other hand the server has to store the adress and port from the client in the moment of connection.
Thank you very much for your help ExxKA
I am curious to know if there is way that I can make my android device as a RTSP server and stream video with any other acceptable device.
I have no understanding of RTSP server and other protocol that should be followed to make this happen.
Any help is appreciated.
Thanks,
SKU
There is nothing to worry about this problem. I seen a solution here
http://techsplurge.com/5080/get-vlc-media-player-for-android-with-unofficial/ take read and get your answer.
AFAIK, the architecture you should adopt is to put in place a remote machine.
On this machine, you must have a server installed : Flash Media Server, Red5, etc. It will host the application that will get the coming stream and will outputs it.
Then, you can stream from a device (that you called "server") to the remote hosted application (ex: www.remoteserver.com:1234/myApp). To stream, just put that url in the input of a media container (http://developer.android.com/reference/android/widget/VideoView.html). Hopefully, Android natively supports the RTSP protocol via that VideoView container.
Hope it helps.
I am trying to implement something similar. One suggestion I have received was, when you are making your device as RTSP server and someone wants to stream video from your device, its called peer to peer streaming. In this case, its better to involve a server in between, which acts like encoder-decoder. As in when another client sends RTSP SETUP request, it comes to your device for sure. But now when you are ready to stream video, send payload (using RTP) to server and server intern sends it to requesting device. You can avoid firewall problems possible in LAN or routers (in case of wife network).