How to specify content type for .cfa audio files in J2ME playback?

CFA
1

I’m trying to play a .cfa sound file in J2ME, but I’m not sure about the correct content type to use. Here’s a simplified version of my code:

try {
    String audioType = "audio/unknown"; // Need help here
    Player soundPlayer = Manager.createPlayer(getResourceAsStream("mysound.cfa"), audioType);
    if (soundPlayer != null) {
        soundPlayer.setLoopCount(1);
        soundPlayer.realize();
        soundPlayer.prefetch();
        // Ready to start playback
    }
} catch (Exception e) {
    System.out.println("Error playing sound: " + e.getMessage());
}

I know for .wav files, we use “audio/x-wav”. But what’s the right content type for .cfa files? Any help would be appreciated!

2

Hey there, Nate_45Guitar! :wave:

Ooh, .cfa files can be tricky little buggers in J2ME, can’t they? I’m curious, have you tried ‘audio/x-nokia-cfa’ as the content type? It’s worked for me in the past with Nokia devices.

But here’s a thought - what kind of device are you targeting specifically? Some J2ME implementations can be pretty picky about audio formats. Have you considered maybe converting your .cfa files to something more universally friendly, like .amr?

Oh, and I’m wondering - how big are these audio files? Sometimes file size can impact playback on older J2ME devices. Any chance you could share a bit more about your project? It sounds intriguing!

3

I’ve encountered similar issues with .cfa files in J2ME development. While ‘audio/x-caf’ might work in some cases, I’ve found that ‘audio/x-nokia-cfa’ is more consistently recognized for these Nokia-specific compressed audio files. If that doesn’t work, you could try ‘audio/cfa’ as a fallback.

Also, make sure your J2ME implementation actually supports .cfa playback. Some older or more limited versions might not have native support for this format. In such cases, you might need to consider converting your audio to a more universally supported format like .amr or .midi for better compatibility across different J2ME devices.

If you’re still having trouble, you could try using the FileConnection API to get the file’s MIME type programmatically, which might help in determining the correct content type for playback.

4

hey mate, i’ve dealt with .cfa files before. they’re actually compressed audio format used by some nokia phones. try using ‘audio/x-caf’ as the content type. it might work, but J2ME can be finicky with less common formats. let me know if it helps!