Custom DataSources With JMF

I am having trouble creating a custom DataSource. Even following this example (http://java.sun.com/products/java-media/jmf/2.1.1/guide/JMFApp-DataSource.html#86181) I still get a NoProcessorException. Do I have to implement anything else to get a custom DataSource to work, even if the one I am trying to uses an existing implementation of PullSourceStream, PullBufferStream, PushSourceStream, or PushBufferStream?
To go into further detail, I am attempting to create a DataSource that pulls data in from a byte stream instead of a file. Unfortunately, I have had no luck. Any help would be greatly appreciated!

Incidently, I cannot find any examples on building my own MediaHandler (which is appearantly what one needs in order to properly use a custom DataSource ?).
Anyone have an example? Is it relatively simple?

Similar Messages

Delta Upload for Customized DataSource

Hello,
I created a Customized DataSource with Full Upload and replicated DS in BW ,now i want to creat Dalta Upload for the same Data Source is it possible can i do ,is there any method or settings to be done to get Delta upload update..
I hope my thread is understandable....
ifnot get back ....!
Thanks

Hi Bhanu,
What is the Safety Upper & Lower limits you have given for your Generic Delta(RSO2 trans). That also matters.
Give Safety Upper limit as 0 & Lower Limit as 1, Replicate the DS once in BW & then try to load Delta.
If possible Delete the Init--> Load the Init again & then try loading Delta after changing the Safety limits & loading INIT.
Hope it helps you!
Regards,
Pavan

Procedures for implementing a snapshot scenario with custom DataSources

Hi Gurus,
I have checked the How To paper ([How to Handle Inventory Management Scenarios in BW (NW2004)|http://www.sdn.sap.com/irj/scn/index?rid=/library/uuid/f83be790-0201-0010-4fb0-98bd7c01e328]). However, only SAP standard BW objects are mentioned in the paper e.g. InfoCube (0IC_C03), Material Stock InfoSource (2LIS_03_BX), Material movements IS (2LIS_03_BF) and Revaluations IS (0LIS_03_UM).
On the contrary, I need to handle custom DataSources for the Snapshot scenario. Are there any differences in the implementation methodology? Which additional aspects should I take into consideration? For example, the load sequence, delta type, etc.
Could you please list out the step-by-step procedures for such an implementation?
Thanks in advance!
Regards,
Meng

Hi Meng,
You can approach this in two ways.
1) If the volume of data is not much, you can derive the balance at query level, as follows.
User enters the date, based on this restrict your key figure to display all values less than this date.
2) If the volume of data is high, then you will have issues with performance if you are calculating the balance in the front end. In this case, you can model this with 'Non cumulative' key figure. Again there are 2 ways of approaching this back end solution based on the volume of data. ( Say in one case you have 2 years of history in your DSO and in the second case, you have 5 years of history ).
A) For example, If there are only 2 years of history
Create a non cumulative Key figure 'ZBALANCE' with inflow and outflow, in a cube.
Map this to your credit and debit as + and - respectively and map the calender day to posting date.
Just initialise the dataload with data transfer and start loading the delta as normal.
You will be able to see the balances for each and every calday in your reporting.
This approach is straight forward and simple.
Compress the cube for getting the better performance.
B) If there are 5 years of history and you are not interested in loading all the 5 years data in getting the balance
Here you want to have the initial balance, continue delta and would like to load 2 years of history.
The cube and non cumulative KF are created as mentioned above.
For generating initial balance, you have to create another DSO without calander day and ZBalance mapped to credits and debits in additive mode. Load your DSO data into this new DSO to generate initial balance. This balance will be loaded to your cube as initial balance. ( Like 2LIS_03_BX ).
You have to compress this request with marker update ( Must ).
Load your historical data for 2 years from the original DSO. Compress without marker update ( Must ).
initialise without data transfer from DSO to cube and load deltas normally.
Compress the delta requests normally for performance reasons.
Please read the 'Inventory document' in detail.
Please let me know, if any of the information is still not clear.
Thanks,
Krishnan

Master Data With Custom Datasource.

Hi,
When we create the custom datasource ( Transactional ) and load it to the BW, it has master data field Company code,Cost Centre.
Doubt is when the company code, Cost Centre are coming from the transactional Custom data source(with data), do we need to still load the Master data from the Master data data sources .
What are points to be considered and known?
Please provide your valuable inputs to understand this condition.

Hi Adhvirao,
As suman said there is master data sources like customer master, vendor master...
check there is SAP predefined master datasources like 0CUSTOMER_ATTR..
First you have to load master data and the only transaction data.. then only you can get rid of data mismatches in the report.
Otherwise there will SID collusion, then it might be chaces you won't get the proper result in reports.
Regards,
Ranganath.
Edited by: Ranganath on Jul 27, 2011 1:01 PM

Extract Structure not Being transported with custom Datasource

I'm having trouble transporting a custom datasource from BW 3.5 dev to QAS. The datasource is coming through and showing up in RSA6 but when I click on it I get the following error:
"The extract structure ZOXDBW0123 of the DataSource ZRSPCTRIGTEXT is invalid
Message no. R8444
Diagnosis
An invalid extract structure has been assigned to the DataSource. An extract structure has to be active in the DDIC. It cannot be a view, since the customer is not able to add append fields for filling in the customer exits to a view."
Any ideas?
Thanks,
Luke

Thanks for your input. We managed to get through one of the errors on about the 8th try to transport everything together. It might of had something to do with the way things were being grouped in the packages.
So now were just getting an RJ044 Error: "ZRSPCTRIGTEXT: Only tables and views are permitted for extraction".
I think it may be some kind of program error after all, cause our basis consultant took a look and couldn't figure it out at all either. The transport says that everything is going through, but the view were extracting from is still not showing up in QAS. He suggested we blow everything away and try building the datasource again from scratch. So if we can't figure it out today we may try that route tomorrow.
Anyway, thanks again for all the help.

Custom DataSource plays in JMStudio, but not in my application

hello everyone. I need someone to help me out who has played around a lot with DataSources.
I have been playing around with custom DataSources for a small while and I have not been able to figure out something and its starting to get frustrating.
First let me tell you what process I exactly follow when I want to create a Custom DataSource (using the "Generating Live Audio/Video Data" datasource code sample as an example - from JMF solutions http://java.sun.com/products/java-media/jmf/2.1.1/solutions/LiveData.html):
1. Suppose the source files (DataSource.java and LiveStream.java) are lying at C:\customds\.
I compile the files like this:
javac -d . DataSource.java LiveStream.java
As a result this directory is formed C:\customds\jmfsample\media\protocol\live which contains all the compiled (interpreted) files.
2. Then I register 'jmfsample' in the Protocol Prefix list and commit the changes using the JMFRegistry GUI.
3. Now if I run JMStudio and enter the URL live: it gives me an error that it can't create a player. I feel this is happening because some classpaths haven't been set correctly. Eventually I figured out that I have to place the \jmfsample\media\protocol\live\ directory inside the <JMF install dir>\lib\. Doing this fixes the problem and now I can go to JMStudio and run the protocol using the 'Open URL'. Giving it 'live://' plays the 'blue screen' like a gem.
4. But here is the catch now. When I create an application which tries to create a player using live:// as a source, it doesn't run and keeps giving me a noPlayerException, or a noDataSourceException (as the case would apply; code given below).
The funny part is that i checked the JMStudio source code for the method that is used to 'Open URL'. I haven't found any siginificant change in the way it opens urls.
I also went a step further and tried to compile and run the JMStudio code myself to trace the code when it is in the process of opening a url. The weird thing is that when I try to do that, giving live:// as a URL gives me the same error that is given by my application. In other words JMStudio when compiled by me gives me same the error of "can't create a player..." when I open the url live://. Has Sun used a JMStudio compiled using a different source file?
Please please anyone tell me what is wrong here.
I have basically tried out these two kinds of things in my code, and both give me a noPlayerException error:
Player guiPlayer = Manager.createRealizedPlayer(new MediaLocator("live://"));and
DataSource ds = Manager.createDataSource("live://");
Player guiPlayer = Manager.createRealizedPlayer(ds);Thanking in anticipation.
regards

Would it be possible for you to expand on your solution a little bit? I'm trying a similar approach, and having a similar problem to yours. From Googling, it appears as if this is a very common problem, and a lot of people give up before they solve it.
I'm trying to use jmf.jag (and optionally add fobs4jmf.jar), not compile it from source. But I am trying to compile my own protocol from source and run it in a debugger. I have all the class files going out to the same output directory, and IntelliJ generally adds them all to the CLASSPATH automatically. But I keep getting NoPlayerException. (If I break down the players construction step-by-step, it seems to fail on "Processor ps = Manager.createProcessor(ds);".)
I'm trying to play a Quicktime movie from memory, and I've confirmed that I'm returning "video.quicktime", that my stream is Seekable and isRandomAccess returns true, my prefix is in the protocol list, and that the package name is correct. I've tried with PLUGIN_PLAYER being true or false, media type being video.quicktime or unknown, and every other permutation I can think of.
Any help would be greatly appreciated.

How to record desktop with jmf?

Hi, i'm new using jmf, so if it's a simple issue i don't know :S
I'm trying to make an app that record the desktop. I have found this:
http://java.sun.com/javase/technologies/desktop/media/jmf/2.1.1/solutions/JVidCap.html
But when i run it:
"! No Devices for RGB, 160x120, FrameRate=15.0"
And a NullPointerException if i push "Start" button.
I tried to change the code, video formats, etc... but nothing successful happened. what's the problem? what's means these error and how to solve it?
Regards.

But... i'm not sure how to use it :PMake your own class.... I am posting this class (just for demo):
* This class uses custom DataSource given at Sun JMF solutions page:
* <a href="http://java.sun.com/javase/technologies/desktop/media/jmf/2.1.1/solutions/ScreenGrabber.html">Screen Grabber</a>
* @author talha
public class ScreenCapture extends JFrame {
    Player p;
    public ScreenCapture() {
        super("Screen Capture");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        try {
            p = Manager.createRealizedPlayer(Manager.createDataSource(new MediaLocator("screen://0,0,640,480/10")));
        } catch (Exception ex) {
            Logger.getLogger(ScreenCapture.class.getName()).log(Level.SEVERE, null, ex);
        if(p.getVisualComponent()!=null)getContentPane().add(p.getVisualComponent());
        p.start();
        pack();
        setLocationRelativeTo(null);
    public static void main(String args[]){
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                new ScreenCapture().setVisible(true);
With this can i read data? I suppose that i can write it to disk directly or not? (replace System.out with an OutpuStream) No, if you want to write the captured video to the disk, you would have to make a Processor and DataSink... if these terms sound new, then you would have to learn JMF. Writing the captured video to disk has been asked many times, my suggestion: search this forum.
Thanks!

Player for custom datasource

Hi
I need to create a custom datasource but i want to play it on a player as other normal datasource.
I tell you what im doing, I have developed a example to show you my problem:
first thing i do is creating a custom datasource:
import javax.media.*;
import javax.media.protocol.DataSource;
import javax.media.protocol.ContentDescriptor;
public class myCustomDataSource extends DataSource {
     myCustomDataSource(MediaLocator ml){}
     public void connect(){}
     public void disconnect(){}
     public void start(){}
     public void stop(){}
     public String getContentType() {
          return ContentDescriptor.CONTENT_UNKNOWN;
     public Object[] getControls() {
         return new Object[0];
     public Object getControl(String type) {
         return null;
     public Time getDuration(){
          return Time.TIME_UNKNOWN;
}then, I create a basic class that use a player for playing my custom datasource:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.media.*;
import javax.media.protocol.DataSource;
public class VideoPlayer extends JFrame {
     Player player = null;
     private JPanel contentPane;
     public static void main(String args[]){
          String mediaFile = "http://noodle.med.yale.edu/demos/dsr_arrow.mpg";
          MediaLocator locator = new MediaLocator(mediaFile);
          myCustomDataSource mcds = new myCustomDataSource(locator);
          (new VideoPlayer(mcds)).setVisible(true);
     public VideoPlayer(myCustomDataSource ds) {
          super("Example");
          setSize(400,400);
          contentPane = (JPanel) this.getContentPane();
          addWindowListener(new myWindowAdapter());
          try {
               player = Manager.createPlayer(ds);
               player.addControllerListener(new controllerUpdate());
          }catch(Exception e){
               System.err.println("Error loading the media. ("+e+")");
          if(player!=null) player.realize();
     class controllerUpdate implements ControllerListener {
          public synchronized void controllerUpdate(ControllerEvent e) {
               if(e instanceof RealizeCompleteEvent) {
                    Component visualArea = player.getVisualComponent();
                    Component controlPanel = player.getControlPanelComponent();
                    if(visualArea!= null)
                         contentPane.add(visualArea, BorderLayout.CENTER);
                    if(controlPanel != null)
                         contentPane.add(controlPanel, BorderLayout.SOUTH);
                    validate();
                    player.prefetch();
               if(e instanceof PrefetchCompleteEvent) {
                    player.start();
     class myWindowAdapter extends WindowAdapter {
          public void windowClosing(WindowEvent e){
               if(player!=null) player.close();
                    System.exit(0);
}when i run it i get the next error: Error loading the media. (javax.media.NoPlayerException: Cannot find a Player for: myCustomDataSource@be0e27)
I dont know how i must fill the myCustomDataSource class constructor and abstract methods to run it.
I test videoplayer class with a normal datasource and it works
sorry for my bad english
Thanks so much

ok, thanks for answering,
I see a sun webpage example maybe can help: http://java.sun.com/javase/technologies/desktop/media/jmf/2.1.1/solutions/JpegImagesToMovie.html
In that example, a custom datasource is declared and then a processor is created with that custom datasource using Manager.createProcessor. For that, custom data source class is declared inside class where processor is used. Im trying to do it but it doesnt work, i get the same error.
thanks in advance
import java.awt.*;
import java.awt.event.*;
import java.util.Vector;
import java.io.*;
import javax.swing.*;
import javax.media.*;
import javax.media.protocol.ContentDescriptor;
import javax.media.protocol.DataSource;
public class VideoPlayer extends JFrame {
     Processor p = null;
     private JPanel contentPane;
     myCustomDataSource mcds = null;
     public static void main(String args[]){
          String locator = "C:/video.avi";
          (new VideoPlayer(locator)).setVisible(true);
     public VideoPlayer(String locator) {
          super("Example");
          setSize(400,400);
          contentPane = (JPanel) this.getContentPane();
          addWindowListener(new myWindowAdapter());
          mcds = new myCustomDataSource(locator);
          try {
               p = Manager.createProcessor(mcds);
          }catch(Exception e){
               System.err.println("Error loading the media. ("+e+")");
          if(p != null){
               //p.setContentDescriptor(null);
               p.addControllerListener(new controllerUpdate());
               p.configure();
     class controllerUpdate implements ControllerListener {
          public synchronized void controllerUpdate(ControllerEvent e) {
               if(e instanceof ConfigureCompleteEvent) {
                    p.realize();
               if(e instanceof RealizeCompleteEvent) {
                    Component visualArea = p.getVisualComponent();
                    Component controlPanel = p.getControlPanelComponent();
                    if(visualArea!= null)
                         contentPane.add(visualArea, BorderLayout.CENTER);
                    if(controlPanel != null)
                         contentPane.add(controlPanel, BorderLayout.SOUTH);
                    validate();
                    p.prefetch();
               if(e instanceof PrefetchCompleteEvent) {
                    p.start();
     class myWindowAdapter extends WindowAdapter {
          public void windowClosing(WindowEvent e){
               if(p != null) p.close();
                    System.exit(0);
     class myCustomDataSource extends DataSource {
          MediaLocator ml = null;
          myCustomDataSource(String locator){
               ml = new MediaLocator("file://"+locator);
               super.setLocator(ml);
          public void connect(){}
          public void disconnect(){}
          public void start(){}
          public void stop(){}
          public String getContentType() {
               return ContentDescriptor.CONTENT_UNKNOWN;
          public Object[] getControls() {
              return new Object[0];
          public Object getControl(String type) {
              return null;
          public Time getDuration(){
               return Time.TIME_UNKNOWN;
}

Creating a custom datasource

hai all,
I saw one example in jmf website "LiveStream", in which we can play the video with RGP format(custom data). They will create the video data in RGP format and we can create the test pattern. have any body tried that, if you are able to do that, kindky let me know that.
Thanking you all
antony

I didn't try this, but have you taken a look at JMF Solutions page ?
I saw there something about creating a custom datasource:
http://java.sun.com/products/java-media/jmf/2.1.1/solutions/LiveData.html
Hai

Help me on building Custom DataSource

Hi,
I tried to build a Custom DataSource, but I am not very clear about the process. Do I have to follow the convention like <package-prefix>javax.media.<protocol>.DataSource ?
It seems for me that JpegImagesToMovie (
http://java.sun.com/products/java-media/jmf/2.1.1/solutions/JpegImagesToMovie.html )
does not follow such a convention. And what I am tyring to build is a DataSource that will read data from a queue which contains RAW data package.
Any suggestions are highly appreciated.
Thanks.
Jim

The way I use the DataSource should like this:
MyDataSource ds = new MyDataSource( param1, param2 );
Processor p = Manager.createProcessor( ds );
In this case, MyDataSource is created directly without
going through Manager, but it is still to be used by
Manager.
Should I follow the convention?What you're doing is fine. In fact, you don't want to follow the packaging convention in this case, because you don't have a zero-argument constructor for your DataSource or a one-argument version that takes a MediaLocator, so Manager.createDataSource() wouldn't be able to create your DataSource anyways.
The trick now is that you have to code your DataSource in a way such that one of the default Processors will be able to call setSource() with your DataSource and not throw an Exception, which is what happens inside of Manager.createProcessor(ds).
Try it and see what happens.
--invalidname

Webcast with JMF

I'm an under-graduate Engineering student - computer division, and I'm developing a virtual classroom application as a part of my graduation project.
I'm doing most of my project using JAVA techonologies, and I waneted to do the virtual classroom part using JAVA too.
I need to do some kind of video/audio conference using JMF, where users can join the conference, see the instrucor, and instructor's screen, also the instructor should be able to receive requests from participants to grant or deny them.
I was playing around with JMF in the last week and I found some interesting features, I also check the JMF solutions, and I ran some of the RTP stuff offered there, but what I need to do involves something like a webcast, which I could not find anything about.
Need help please
Thanks in advance
J.MAX

My latest thoughts on this (after some hacking):
RTSP server available called VODKA (Video On Demand Kicks Ass) some code is there, a reply from a developer was 'try it' so I think you could get something out of it.
Using RTP I wrote my own sockets controller to count how many connections there are (also sending setup, start, stop and teardown, like RTSP, so the 20-30% cpu of the transcoder isn't always on), you could then send video to each person who asks...) or if you are on the same subnet or VPN then you could multicast.
multiple unicasts would require datasource cloning? I am not sure... hope this helps you work some things out, my solution was to use multicasting with some custom sockets

MMAPI: custom DataSource? who?

Hi all!
In the doc of javax.microedition.media.Manager you can read the following:
"Users can also implement a custom DataSource to handle an application-defined protocol. The custom DataSource can be used to create a Player by using the createPlayer method."
Does anyone know how to do that?
I thought about overwriting the DataSource class, but I really don't know if this is the right way.
Or is there a method that returns a DataSource object?
(something like for the InputStream:
--->InputStream is = getClass().getResourceAsStream("test.wav");
I didn't find anything useful about this topic, hope someone has some experiences.
thanks!
regards andi.

All of the documentation says it works with RTSP, and has been tested and shown to be working with a few RTSP servers. Perhaps you could get one of them and see if you can view content that comes from one of the ones that's known to play ball with JMF?

Error while transporting custom datasource

Hi All,
Below is the scenario that was carried out in my project.
1. Created OHD to load data from a CUBE to Data base Table /BIC/ABC.
2. Created a custom Datasource ZABC_TEST with the above table.
3. Activated the DataSource and loaded the data. (Data load successfull. It works fine).
4. Tried transporting the above. But trows error while transporting the data source.
Error -- InfoSource ZABC_TEST is not available in source system BITST.
Let me know what can be done to solve the above error. Please suggest if i have missed out something.
Thanks in advance.
Maddy

HI,
The problem seems to be occuring since you are transporting both OHD and DS in the same TR request.
Transport first the DS in a request, then in another request transport the OHD.
This should resolve the issue.
hope this helps.
thanks,
rahul

Custom Datasource using View COVJ - R8359 Invalid extract structure

I'm trying to build a custom datasource so I can get at plan line item data with partner object (I've tried using 0CO_OM_CCA_1 but I dont get the partner object for plan data - no idea why). So I thought if I create a datasource using COVJ I can get it out. However when I try and save the custom datasource (created using RSO2) I get the error R8359 Invalid extract structure: You tried to generate an extract structure with the template structure COVJ. This operation failed, because the template structure quantity fields or currency fields, for example, field WOG001 refer to a different table.
I saw posts saying when people get this error thye should reference the table these fields come from in the view. So I've talked to our ABAP'er and I asked him to reference the table these fields come from but he said this cant be done because these come from a structure not a table.
Any ideas?
Thanks
Joel

The WOG* columns in table COEJ, one of the tables contributing to the COVJ view, use CCCUR-CURKY as the reference table-column for those quantities. The ABAPer you spoke to is correct that CCCUR is a structure. View value fields inherit their reference table-column from the source, in this case COEJ, and since this source table is an SAP delivered table it cannot be modified change this reference.
This means that you're only option for extracting the data out of the COVJ view would be to create a Function Module and use that Function Module as the basis for your DataSource.

Select option greyed out for fields of custom DataSource (rso2, rsa6)

Hi
Why are several fields, in my custom DataSource (created in rso2) not available for select?
I do not think this is a permission issue, since several fields are selectable, but not all fields.
It is not the data type, since I see other custom DataSources that have the same data type, and it is selectable as a select option.
This is not a DataSource that was provided by SAP, it is completely custom, and uses a custom data definition (defined as a structure via se11), and a custom function.
I have read the responses to similar questions, but have not found an answer that explains how to make the field selectable for select.
What determines which fields can be selected for selection, and which fields have this option greyed out (not selectable)?
I have come across multiple answers, for similar questions, that suggest an abap program to directly update table roosfield.
Is this safe?
IF I choose this route will I need to run the update program on production, or will the change it makes to my dataSource transport with my transport?
(I can test this).
What I most need to know is If this suggestion is safe, or if it has side effects?
Thank you

Hi Eileen,
In Least case to enable the selection for the fields with the below program:
Below code is for your reference which will use to unhide objects in RSO2 or RSA6 for Data source( in code for BELNR, KUNNR, VBELN, BUDAT fields are unhiding for 0fi_ar_4 data source selection option) . Still need any clarifications let me know.
SE38: Create a program for ref below code.
REPORT ZNP_SELE_DS.
tables: ROOSFIELD.
UPDATE ROOSFIELD SET SELECTION = 'P'
WHERE OLTPSOURCE = '0FI_AR_4' AND OBJVERS = 'A' AND FIELD = 'BELNR'.
UPDATE ROOSFIELD SET SELECTION = 'P'
WHERE OLTPSOURCE = '0FI_AR_4' AND OBJVERS = 'A' AND FIELD = 'KUNNR'.
UPDATE ROOSFIELD SET SELECTION = 'P'
WHERE OLTPSOURCE = '0FI_AR_4' AND OBJVERS = 'A' AND FIELD = 'VBELN'.
UPDATE ROOSFIELD SET SELECTION = 'P'
WHERE OLTPSOURCE = '0FI_AR_4' AND OBJVERS = 'A' AND FIELD = 'BUDAT'.
Thanks & Regards,
Srinu.Rapolu

Custom DataSources With JMF

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