Java Development

[Mudassir]

Hi All,

I wanna play the song through streaming.

I wanna play audio File. But instead of connection with the specific file. I wanna pass the array of bytes directly to the stream,and then play those bytes to the players.

How can I achieve this ?

[Mudassir]

Hi,

I wanna play audio player, directly by passing array of bytes...

Message Edited by Mudassir on 08-26-2009 09:08 AM

[cliff76]

Having direct experience, I can tell you that the streaming API is broken (not functional) in OS versions prior to 4.3. I believe somewhere after 4.3 they enabled streaming and I know for certain that its available in 4.5. So the first thing you'll need t odo is upgrade beyond 4.3 if you haven't already. Next you can try invoking the J2ME MMAPI call that accepts an input stream and see if that works. I haven't tried this yet but I'm planning on doing so. Post back on your progress cause I'd love to know how well and on which devices this works. Here's the API call you'll want to look at:

javax.microedition.media.Player player = javax.microedition.media.Manager.createPlayer(getAudioInputStream(), "audio/x-wav");

[rab]

You can always use a custom  DataSource class. It works with all OS versions.

Rab

[cliff76]

You know what? That's a good idea. I never thought about that many years ago... I like it! I'll definitely have to try this out...

[Mudassir · Accepted solution]

ByteArrayInputStream in2 = null;
try 
{
   FileConnection fileConnection = (FileConnection)Connector.open("file:///SDCard/Blackberry/music/1.wav", Connector.READ );                                    
   InputStream inputStream = fileConnection.openDataInputStream(); 
   byte[] audioData = new byte[(int)fileConnection.fileSize()];
   inputStream.read(audioData,0,audioData.length);
   {
         in2 = new ByteArrayInputStream(audioData);
   }
}
catch (Exception ex) 
{
   System.err.println("Error open file connection."+ex.toString());               
}
            
                      
 
   secondPlayer = javax.microedition.media.Manager.createPlayer((InputStream)in2, "audio/wav");
        //    secondPlayer.addPlayerListener(this);
              
   secondPlayer.realize();
            
            
   secondVolumeControl = getVolumeControl(secondPlayer);
            
            
   if (secondVolumeControl != null)
       secondVolumeControl.setLevel(90);
   secondPlayer.prefetch();
   secondPlayer.start();

thanks every one, finally i found the solution.It is possible by taking the ByteArrayInputStream, and passing the array of bytes of any wave file.But the array of bytes should be in the proper sequence as it store in the Wave File.

Thanks all...

[cliff76]

That's interesting. Does the audio data have to be played from memory? I see you get the InputStream from the SDCard ten read into a memory array before creating a second InputStream around the memory contents. Is this necessary or can you play the stream directly off of the card? Also, when you mention the right order are you referring to big endian vs. little endian? If so, do you have examples of byte-order swapping over an audio stream? I apologize for the barrage of questions. I'm getting ready to dive into the same type of development and I don't want to bang my head like I did last time.

[rab]

Just one remark:

   this solution ( if I am not mistaken ) requires the entire file to be downloaded before starting the player.

The solution using the DataSource will allow you to play while downloading.

Rab

[cliff76]

This kinda makes sense. I remember having buffer issues and truncation when I tried using a direct URL to the audio. Of course I was using this for TTS so I also implemented a weird way of breaking up sentences into separate calls and chaining them together with an "on complete".

[Mudassir]

Hi,

If possible, then, may you plz explain more clearly ?