WAV AMR playback inconsistancy.

[adamzieba]

I tried all day to get a wav file to play and discovered that

Player player = Manager.createPlayer(getClass().getResourceAsStream("ktbado.wav"), "audio/x-wav");

works, but

InputStream is = getClass().getResourceAsStream("ktbado.wav");
               Player player = Manager.createPlayer(is, "audio/x-wav");

doesnt. I am very confused by this as they are the same thing basically. Is it an issue with the io API ?

Furthermore, when i change the file to a .amr file and use

 InputStream is = getClass().getResourceAsStream("left.amr");
               Player player = Manager.createPlayer(is, "audio/amr");

or

Player player = Manager.createPlayer(getClass().getResourceAsStream("left.amr"), "audio/amr");

The emulator gives me "MediaException cannot create a Player for audio/amr"
The phone (Nokia E50) gives me "MediaExceptionPrefetch error: -5"

Sigh. This has been a rough day (3 lines of code written =) ).

[hartti]

amr is supported on that device. What is the bit rate for that file?

Hartti

[adamzieba]

I tried two 4.75k and 27.5 k , what does the bitrate make a difference for? I saw that there is amr-wb (or something ) but that file extension is .awb.


I really don't get it. It just works. After reading about a zillion things for a few days, it just worked.

I decided to write this and see what was supported.

    String[] contentTypes = Manager.getSupportedContentTypes(null) ;
            Properties.insert(0,contentTypes[0],null);
            
            
              for (int x = 0  ; x < contentTypes.length  ; x++)
              { 
                Properties.insert(x,contentTypes[x],null);
                
              }

I ran that saw that mp3 was supported then i ran this:

 Player player = Manager.createPlayer(getClass().getResourceAsStream("left.mp3"), "audio/mpeg");
        player.start();

This didnt work (obviously since video/mpeg exists not audio/mpeg)
so I changed the /mpeg to /mp3 and guess what? It worked. Then I changed the type to /amr and used the same "left.amr" and it worked.

Im putting this down to the compiler being bad. I cant explain it.

[atiqkamran]

Hi adamzieba,
i tried to play Mp3 file in both ways but its not playing, so oculd you please tell me what should i do.

my code is :

..
..
..

try {

player = Manager.createPlayer(getClass().getResourceAsStream("frogs.mp3"),"audio/mp3");
player.realize();

// get the volume control
volume = (VolumeControl)player.getControl("VolumeControl");

// initialize it to 50
volume.setLevel(50);

// initialize the gauge
gauge.setValue(volume.getLevel());
gauge.setLabel("Volume: " + volume.getLevel());

player.setLoopCount(2);

player.start();

form.setTitle("Playing " + locator);

} catch(Exception e) {
e.printStackTrace();
}}
..
..
..


when i am trying to run this code so i am getting Exception:

Running with locale: English_United Kingdom.1252
Running in the identified_third_party security domain
javax.microedition.media.MediaException: Cannot create a Player for: audio/mp3
at javax.microedition.media.Manager.getPlayerFromType(+52)
at javax.microedition.media.Manager.createPlayer(+35)
at javax.microedition.media.Manager.createPlayer(+53)
at AudioPlayerCanvas.playMedia(+15)
at Midlet.commandAction(+219)
at javax.microedition.lcdui.List.callKeyPressed(+80)
at javax.microedition.lcdui.Display$DisplayAccessor.keyEvent(+198)

[adamzieba]

Did you try the code which I said worked ?

Player player = Manager.createPlayer(getClass().getResourceAsStream("ktbado.wav"), "audio/x-wav");
player.start();

Funnily enough... Now that i test the code, my emulator crashes

java.lang.OutOfMemoryError

Are you trying it on the emulator or the phone? As far as I can see. The emulator only supports very few things, audio/x-wav is one of them.