Using WebRTC DataChannel for Android

[samfast]

Hello All,

I have been trying to implement WebRTC DataChannel for Android Application. I have a question, if my application only uses datachannel and no audio/video, do I need to use 

PeerConnectionFactory.initializeAndroidGlobals(this, false, false, false);
       
PeerConnectionFactory factory = new PeerConnectionFactory();

before creating my PeerConnection object. Whenever I try to do like this, I get the Fatal Signal 11 (SIGSEGV) error. Moreover, I also see the following message in the logcat:

Could not find the method android.media.MediaCodec.setParameters.

Am I doing it a wrong way? I just want to implement PeerConnection with DataChannel like this: 

this.pc = factory.createPeerConnection(RTCConfig.getIceServer(),
      RTCConfig.getMediaConstraints(), this);
     
dc = this.pc.createDataChannel("sendDataChannel", new DataChannel.Init());

I am finding it very difficult to implement the DataChannel on Android. I have tried several ways and asked questions many times.

Can anybody give me a sample source code for Android which implements DataChannel? Or Can anybody give me the link to find easy documentation on how to use these above methods when implementing on Android?

Thank you.

[Gilded Honour]

Were you able to make it work?

[Sojharo Mangi]

Yes,

This is a known bug in WebRTC code for Android. Following threads talk more on this bug:

https://code.google.com/p/webrtc/issues/detail?id=3416

https://code.google.com/p/webrtc/issues/detail?id=3234

The bug is currently in open status. However, there is a workaround available which will work for now. In Android Globals, we need to pass the audio and video parameters as true:

PeerConnectionFactory.initializeAndroidGlobals(getApplicationContext(), true, true, VideoRendererGui.getEGLContext());

On Sun, Apr 12, 2015 at 8:04 AM, Gilded Honour <gilded...@gmail.com> wrote:

Were you able to make it work?

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Regards,

 

Sojharo

[Gilded Honour]

My issue is that onDataChannels never gets triggered on "Answer" side so the DataChannel doesn't get created on Answer side either. Could I see your code anywhere?
Are you sure those issues are related to this?

[Sojharo Mangi]

The issue I was having is different. For implementing this, I am going through the following process:

1. Peer A (who starts sending the file) creates PeerConnection object "pc" and then creates DataChannel on it using pc.createDataChannel()

2. After this, we call the createOffer function i.e. pc.createOffer()

3. Later, if createOffer() was successful, then onCreateSuccess(SessionDescription sdp) will be triggered.

4. Inside this function, you would set local description on pc using pc.setLocalDescription(FilePeer.this, sdp); and send the sdp to other peer using any signalling technique (I used socket.io).

5. After this, other peer would get the answer.

6. Later, you need to follow the whole process of sending and receiving candidates.

7. Peer A already has datachannel object, Peer B would receive the datachannel when onDataChannel would be triggered.

I am able to send the messages between two peers. One of them is on web and other on Android. When I send the message from Android to Web. I get ArrayObject {} and not data.

[Yossi Elkrief]

Hi,

I'm trying to follow that exact same flow and can't seem to get it to work.

Do you have any git/gist/open source sample working to show? 

[Sojharo Mangi]

My code is property of where I work. However, if you can share some snippets of your code or explain exact problem then it would help.

--

Regards,

 

Sojharo

[Yossi Elkrief]

First phase - 
I only want to use the Data channel 
I've made a sample that works with 2 PeerConnections for emulating data transfer - right now just sending a simple string. 

and it's on the same device... 

How do i get it to connect to a different device and is it possible to send bytes via the channel? 

[Sojharo Mangi]

Yes, it is possible to send bytes via this channel. I was able to transfer files between devices using this channel. You can enhance your sample and connect signaling server to it and use it to make connection between two different devices.

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Regards,

 

Sojharo