Wowza Server Module - Timer/Countdown on Video Chat

Question

For our current project we need a video chat application which keeps track of the duration of those video conversations.

Every conversation also has a limited time after which the chat terminates.

I've build already the basic module, but i've got problems implementing that timer. In a WOWZA 1-to-1 Video Chat Application are always 2 Streams:

User1 publishes a stream, which User2 plays (subscribes to)
User2 publishes a stream, which User1 plays (subscribes to)

The limited time amount is saved (before the chat) in a database.

Now what's the best way to decrease this amount?

I can't do that in a StreamListener, because there are always two stream and it would decrease twice.

Maybe some sort of Singleton?

Thanks!

Answer 1

Instead of a singleton, if your video-chat time does not change once the chat starts, you can implement a module and attach a TimerTask on play or publish event. Below is an example for you to help you get started.

import java.util.Timer;
import java.util.TimerTask;

import com.wowza.wms.amf.AMFDataList;
import com.wowza.wms.client.IClient;
import com.wowza.wms.logging.WMSLogger;
import com.wowza.wms.module.*;
import com.wowza.wms.request.RequestFunction;
import com.wowza.wms.stream.IMediaStream;
import com.wowza.wms.stream.IMediaStreamActionNotify;

public class KillAfterNSeconds extends ModuleBase implements IMediaStreamActionNotify {

    private class StreamKiller extends TimerTask{       
        private IMediaStream stream;        
        public StreamKiller(IMediaStream s){
            this.stream = s;
        }       
        @Override
        public void run() {
            try{
                // Complete all your clean up, such as :
                if(stream != null){
                    WMSLogger.getLogger("").info("Killing stream: " + stream.getName());
                    stream.getClient().shutdownClient();
                    stream.shutdown();
                    stream.close();
                }               
            }catch(Exception e){}
        }
    }

    public void publish(IClient paramIClient,
            RequestFunction paramRequestFunction, AMFDataList paramAMFDataList) {
        WMSLogger.getLogger("").info("Start running publish..");
        IMediaStream stream = getStream(paramIClient, paramRequestFunction);
        stream.addClientListener(this);
        Timer timer = new Timer();
        TimerTask task = new StreamKiller(stream);
        // replace here with the actual time to kill stream
        timer.schedule(task, 10000); 
        invokePrevious(paramIClient, paramRequestFunction, paramAMFDataList);
        WMSLogger.getLogger("").info("Finish running publish..");
        return;
    }

    @Override
    public void onUnPublish(IMediaStream stream, String streamName,
            boolean isRecord, boolean isAppend) {
        WMSLogger.getLogger("").info("Start onUnPublish..");
        double elapSeconds = stream.getElapsedTime().getTimeSeconds();
        WMSLogger.getLogger("").info("Elapsed time " + elapSeconds);
        WMSLogger.getLogger("").info("Finish running onUnPublish..");
    }

    @Override
    public void onPause(IMediaStream arg0, boolean arg1, double arg2) {     
    }
    @Override
    public void onPlay(IMediaStream arg0, String arg1, double arg2,
            double arg3, int arg4) {
    }
    @Override
    public void onPublish(IMediaStream arg0, String arg1, boolean arg2,
            boolean arg3) {
    }
    @Override
    public void onSeek(IMediaStream arg0, double arg1) {
    }
    @Override
    public void onStop(IMediaStream arg0) {     
    }

}