How to play sounds (rightly) in games?

Hello

What is the correct way to play a sound effect in a game (or any application using a wire loop). I use a method that works very well on 99% of the phones, but it seems to cause a small number of phones for my client to freeze after a few sounds in game (I guess it's sort of leak memory). I also noticed that it creates an error in my event log (StreamingException: not logged in net.rim.device.internal.streamingnatives), even if the game continues to function normally.

Obviously something is wrong, but I can't understand what it is. Here is the code I use:

SoundObject.java:

public class SoundObject {
    Player player;
    VolumeControl vc;

    public SoundObject(String res) {
        Class cl = null;
        try {
            cl = Class.forName("my class path goes here");
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }

        InputStream input = null;
        try {
            input = cl.getResourceAsStream(res);
            player = Manager.createPlayer(input,"audio/mpeg");
            player.realize();
            player.prefetch();
            vc = (VolumeControl) player.getControl("VolumeControl");
        } catch (Exception e) {
            e.printStackTrace();
        }finally{
            try {
                if(input != null){
                    input.close();
                    input = null;
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    public void setVolume(int val){
        try{
            if(this.vc != null){
                vc.setLevel(val);
            }
        }catch(Exception e){
            e.printStackTrace();
        }
    }

    public void Play(){
        if(Settings.getSoundVolume() == 0) return;
        try {
            if(player != null){
                player.stop();
            }
            player.start();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

To load the sound I do the following:

public static SoundObject sound_boing = new SoundObject("/boing.mp3");
sound_boing.setVolume(50);

And in the thread of my game, I play the sound like this:

sound_boing.Play();

Can someone tell me what I'm doingwrong? Copy the following code causes a memory leak? Y at - it a particular format of the audio file I should avoid? This could be the cause of the StreamingException: Session not open error?

Thank you!

Hi Dekerta!

If I read your code correctly you are creating an InputStream to a sound file, and then close the stream before playing what seems to be the problem. Calling prefetch below will read the InputStream and pre-load the player with data - if the file is small enough (which I am assuimg that yours is) then it can indeed read the entire file in the stream.

The essential point that you don't know, is that this loading is made asynchronously. As you close the stream your finally block you introduce a race condition - if it finally is executed before the player is first read then you will get the Exception you see (the stream is not open because you closed it). If the player completes the preloading before closing the flow then the sound will play, which seems to be the case for 99% of the time .

Rather than close the stream immediately, why not keep it open until the player becomes closed in this way it is always available for the player and is no longer available when you can be sure that the player no longer has need you can save it to a field in your SoundObject and close in a PlayerListener implementation when you get the event PlayerListener.CLOSED

As alternative approach to play 'unique' sounds, check on the sample inthe pos , it is optimized for work for the CDMA and GSM-based devices universally, all keeping as minimal as possible use of the resources and the most effective cleaning possible. The only other approach I've used that works well is to mix your own sounds, but I won't get it here since it is a topic all by itself (although the DEV04 session of the Conference DevCon2010 in recent years tells you how... just saying ' ).

Tags: BlackBerry Developers

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