AudioInputStream from InputStream ( load from resource directory)

Question

I try to load my sounds from my resource folder when trying out my Application in the IDE.

For images and other stuff that uses InputStreams I use this method:

@Override
public InputStream readAsset(String fileName) throws IOException {
    ClassLoader classloader = Thread.currentThread().getContextClassLoader();
    InputStream is = classloader.getResourceAsStream(fileName);
    return is;
}

this lets me open an Inputstream of which I can pull Images.

As soon as I would try to cast this InputStream to an Audio InputStream I get errors. Also if I would try to make a new AudioInputStream passing the above InputStream as the parameter.

This is my current way to load sounds from external paths:

public class JavaSound implements Sound {

private Clip clip;


public JavaSound(String fileName){
    try {
        File file = new File(fileName);
        if (file.exists()) {

            //for external storage Path
            AudioInputStream sound = AudioSystem.getAudioInputStream(file);

            // load the sound into memory (a Clip)
            clip = AudioSystem.getClip();
            clip.open(sound);
        }
        else {
            throw new RuntimeException("Sound: file not found: " + fileName);
        }
    }
    catch (MalformedURLException e) {
        e.printStackTrace();
        throw new RuntimeException("Sound: Malformed URL: " + e);
    }
    catch (UnsupportedAudioFileException e) {
        e.printStackTrace();
        throw new RuntimeException("Sound: Unsupported Audio File: " + e);
    }
    catch (IOException e) {
        e.printStackTrace();
        throw new RuntimeException("Sound: Input/Output Error: " + e);
    }
    catch (LineUnavailableException e) {
        e.printStackTrace();
        throw new RuntimeException("Sound: Line Unavailable Exception Error: " + e);
    }


}

@Override
public void play(float volume) {

    // Get the gain control from clip
    FloatControl gainControl = (FloatControl) clip.getControl(FloatControl.Type.MASTER_GAIN);

    // set the gain (between 0.0 and 1.0)
    float gain = volume;
    float dB = (float) (Math.log(gain) / Math.log(10.0) * 20.0);
    gainControl.setValue(dB);

    clip.setFramePosition(0);  // Must always rewind!
    clip.start();
}

@Override
public void dispose() {
    clip.close();
}
}

how can i exchange the AudioInputStream part to work like the first code, pulling the files out of my resource directory?

EDIT : this way of creating a new AudioInputStream by passing an InputStream

File file = new File(fileName);
        if (file.exists()) {
            ClassLoader classloader = Thread.currentThread().getContextClassLoader();
            InputStream is = classloader.getResourceAsStream(fileName);

            //for external storage Path
            AudioInputStream sound = new AudioInputStream(is);

            // load the sound into memory (a Clip)
            clip = AudioSystem.getClip();
            clip.open(sound);
}

also throws errors before even running it

Answer 1

this made it work in my above code:

public JavaSound(String fileName){
    try {

        ClassLoader classloader = Thread.currentThread().getContextClassLoader();
        InputStream is = classloader.getResourceAsStream(fileName);
        AudioInputStream sound = AudioSystem.getAudioInputStream(new BufferedInputStream(is));

        // load the sound into memory (a Clip)
        clip = AudioSystem.getClip();
        clip.open(sound);
    }
    catch (MalformedURLException e) {
        e.printStackTrace();
        throw new RuntimeException("Sound: Malformed URL: " + e);
    }
    catch (UnsupportedAudioFileException e) {
        e.printStackTrace();
        throw new RuntimeException("Sound: Unsupported Audio File: " + e);
    }
    catch (IOException e) {
        e.printStackTrace();
        throw new RuntimeException("Sound: Input/Output Error: " + e);
    }
    catch (LineUnavailableException e) {
        e.printStackTrace();
        throw new RuntimeException("Sound: Line Unavailable Exception Error: " + e);
    }


}

just had to start a new bufferedInputStream with my inputStream to have the AudioInputStream... :D still thanks a lot ;)

Answer 2

You cannot cast InputStream to AudioInputStream (you could do the inverse). The Clip.open() wants an AudioInputStream.

An approach, suggested by this answer here is to use the URL from the .getResource() call, rather than attempting to open the InputStream and then pass that in.

Therefore, try:

URL soundURL = classloader.getResource(fileName);
AudioInputStream ais = AudioSystem.getAudioInputStream(soundURL);