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The main purpose of this libraryis to modernize and maintain the slick2D library.

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package com.github.mathiewz.slick.openal;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;

/**
 * Decode an OGG file to PCM data
 *
 * @author Kevin Glass
 */
public class OggDecoder {
    /**
     * Create a new OGG decoder
     */
    public OggDecoder() {
    }

    /**
     * Get the data out of an OGG file
     *
     * @param input
     *            The input stream from which to read the OGG file
     * @return The data describing the OGG thats been read
     * @throws IOException
     *             Indicaites a failure to read the OGG file
     */
    public OggData getData(InputStream input) throws IOException {
        if (input == null) {
            throw new IOException("Failed to read OGG, source does not exist?");
        }
        ByteArrayOutputStream dataout = new ByteArrayOutputStream();

        OggInputStream oggInput = new OggInputStream(input);

        while (!oggInput.atEnd()) {
            dataout.write(oggInput.read());
        }

        OggData ogg = new OggData();
        ogg.channels = oggInput.getChannels();
        ogg.rate = oggInput.getRate();
        oggInput.close();
        byte[] data = dataout.toByteArray();
        ogg.data = ByteBuffer.allocateDirect(data.length);
        ogg.data.put(data);
        ogg.data.rewind();

        return ogg;
    }
}