Could Not Create Player

[j2meSak]

Hi,

I am trying to build a sound recording application on Series 60 2nd Edition platform using J2ME.

Following is a snippet of my code for the same:

//Imports Section
import java.io.IOException;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import javax.microedition.media.*;
import javax.microedition.media.Control.*;
import com.nokia.microedition.media.control.RecordControl;


//Method to start recording
public void StartRecording()
{
try
{
//Create a player
Player p = Manager.createPlayer("capture://audio");
p.realize();
//Get RecordControl, Set RecordLocation and Record for 5 secs
RecordControl rc=(RecordControl)p.getControl("RecordControl");
rc.setRecordLocation("file:/tmp/audio.wav");
rc.startRecord();
p.start();
Thread.currentThread().sleep(5000);
p.stop();
rc.stopRecord();
rc.commit();


}
catch(Exception ex)
{
Form frm3=new Form("Record Error");
frm3.append(ex.getMessage());
Display.getDisplay(this).setCurrent(frm3);
}
}


I have referred the example given in the forum, but when i run it in the emulator it gives me the "Could not create Player" error.

I am pretty new to development on this platform. Can someone please guide me here.

Thanks,
Saket

[sis1987]

please check this link i think this is usefull to you
http://www.java2s.com/Tutorial/Java/...turedAudio.htm

[j2meSak]

Thanks sis1987.

I went through the example provided in the link and it seems that syntactically both the codes are similar. Especially the line to create the player:

Link Example:
capturePlayer = Manager.createPlayer("capture://audio");

My Code:
Player p;
p = Manager.createPlayer("capture://audio");

Yet i get the error ("Could not Create Player") above.

As of now it does not appear to be a issue with the code. I guess i am missing something else.

Also one more point. I get the createPlayer in italics. Could that mean anything?

Regards,
Saket

[j2meSak]

One more observation......

If i change the value in the media locator then i do not get any issues.

For eg:

if i change the existing line:

Player p=Manager.createPlayer("capture://audio");

to this:

Player p=Manager.createPlayer(Manager.TONE_DEVICE_LOCATOR);

or this:

InputStream is=getClass().getResourceAsStream("audio.wav");
Player p=Manager.createPlayer(is,"audio/X-wav");

Then the error disappears. I am now wondering if this has something to do with the
"capture://audio" statement.....

Any Ideas?

Regards,
Saket

[Tiger79]

on which phone are you trying this ?
Or are you trying on an emulator ?
It might be so that the emulator doesn't support it, for example some emaultors (like wtk) are very limited themselves with what a Player actually can do (record but also play)...

[j2meSak]

Hi Tiger79


on which phone are you trying this ?
I am trying this on Nokia 3500c handset.
Or are you trying on an emulator ?
I am not trying it on a emulator since emulator does not support audio capture

Surprisingly, i simply included the encoding part in the CreatePlayer locator and it started working. But it should work without the encoding too right?

Even more surprising later when i removed the encoding the app works......

Right now i am not going too deep into why this happened due to time constraints. But i guess since i am new i may have gone wrong somewhere....

However, if somebody can throw some light on this then i will greatly appreciate.

Thanks,
Saket

[Tiger79]

you could start by trying out :

player=Manager.createPlayer(“capture://audio?encoding=amr”);
player.realize();

Have a look at this tutorial, it's pretty good, even if a little old :
http://www.hcilab.org/documents/tutorials/AudioTest/

[j2meSak]

Thanks Tiger79!

I am pretty sure that the link should be very helpful for me.....

[j2meSak]

Okay just an update.

In my case i figured out that the issue could be related to the location where the file is getting created/saved on the device. Maybe it has something to do with the size constraints. Because initially when i was saving the file to the default phone memory i was getting such issues. However, once i changed the path to my external memory the error has stopped occurring.

I am not sure if this is the actual reason but it worked for me.

Regards,
Saket