Development of a remote object webcam controller rowc using corba and jmf
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Development of a Remote Object Webcam Controller (ROWC) using CORBA and JMF. Thesis Project University of Arkansas at Little Rock Frank McCown http://www.harding.edu/fmccown/rowc/. Technologies Used. CORBA Middleware for remote method invocations in a heterogeneous environment

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Development of a Remote Object Webcam Controller (ROWC) using CORBA and JMF

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Development of a Remote Object Webcam Controller (ROWC) using CORBA and JMF

Thesis Project

University of Arkansas at Little Rock

Frank McCown

http://www.harding.edu/fmccown/rowc/


Technologies Used

  • CORBA

    • Middleware for remote method invocations in a heterogeneous environment

  • Java Virtual Machine

    • Platform independent run-time environment

  • Java Media Framework (JMF)

    • API for development and incorporation of time-based media (like audio and video) into Java applications

  • Real-time Transfer Protocol (RTP)

    • Quick delivery protocol layered on top of UDP for providing streaming video


System Architecture

Streaming video

Streaming archived video

QuickTime video files

Media Server

WebCam Processors

WebCam Controllers


WebCam Processor

  • Running on machine with JMF-compatible webcam


WebCam Controller

  • Can view video from any webcam and any archived video


Media Server

  • Stores QuickTime video to file

  • Metadata stored in MS SQLServer


Architectural View


Event Notification

  • CORBA’s Event Service and Notification Service

    • Useful in large distributed systems where management and proliferation of events are difficult to control

  • Distributed Callback Model1

    • Client calls method on Server and supplies a callback

    • Server responds using client’s callback

1D. Schmidt and S. Vinoski, “Distributed Callbacks and Decoupled Communication in CORBA,” C++ Report, vol. 8, October 1996.


Registration Object IDL

interface Registration

{

// Notify MediaServer that a new CamController has started

oneway void addCamController(in string hostName, in CamControllerCallback callback);

// Notify MediaServer that CamController is going down

oneway void removeCamController(in string hostName);

// Notify MediaServer that a new CamProcessor is available

oneway void addWebCam(in string location);

// Notify MediaServer that a CamProcessor is no longer available

oneway void removeWebCam(in string location);

// Used by CamProcessor to get MediaServer's host name

string getServerHostName();

// Return array containing locations of all active CamProcessors

StringArray getLocations();

};


CamControllerCallback IDL

interface CamControllerCallback

{

// Notifies all CamControllers that a new CamProcessor is

// available

oneway void addWebCam(in string location);

// Notifies all CamControllers that a CamProcessor is no longer

// available

oneway void removeWebCam(in string location);

};


RegistrationImpl.java

public class RegistrationImpl extends rowc.RegistrationPOA

{

protected Hashtable camControllers;

public synchronized void addCamController(String hostName,

CamControllerCallback callback)

{

camControllers.put(hostName, callback);

}

public synchronized void addWebCam(String location)

{

// Notify all webcam controllers of new webcam at given location

Enumeration enum = camControllers.elements();

while(enum.hasMoreElements()) {

CamControllerCallback callback = (CamControllerCallback)enum.nextElement();

callback.addWebCam(location);

}

}


VideoViewer.java

This class controls the GUI for the Webcam Controller.

public class CamControllerCallbackImpl extends rowc.CamControllerCallbackPOA

{

// Server notifying us that new webcam is available. Add it to our list of locations.

public synchronized void addWebCam(String location)

{

locationsComboBox.addItem(location);

locationsComboBox.repaint();

}

}


For More Information

  • Thesis, source code, and presentation is available at http://www.harding.edu/fmccown/rowc/


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