FormatUtils.java

package jass.render;

/**
    Utility class to convert sample types.
    @author Kees van den Doel (kvdoel@cs.ubc.ca)
*/
public final class FormatUtils {
    /** Endianness. */
    public static boolean bigEndian = false;

    /** Convert short array to float array.
        @param buf User provided float array to return result in.
        @param sbuf User provided sort array to convert.
        @param bufsz Sumber of float samples to write.
    */
    static final public  void shortToFloat(float [] buf, short[] sbuf,int bufsz) {
        for(int i=0;i<bufsz;i++) {
            buf[i] = (float)(sbuf[i]/32768.);
        }
    }

    /** Convert float array (in range [-1 1]) to short array.
        @param shortSound User provided short array to return result in.
        @param dbuf User provided float array to convert.
     */
    static final public void floatToShort(short[] shortSound, float [] dbuf) {
        int bufsz = dbuf.length;
        for(int i=0;i<bufsz;i++) {
            shortSound[i] = (short)(32767. * dbuf[i]);
        }
    }

    /** Convert float array to byte array.
        @param byteSound User provided byte array to return result in.
        @param dbuf User provided float array to convert.
     */
    static final public void floatToByte(byte[] byteSound, float[] dbuf) {
        int bufsz = dbuf.length;
        int ib = 0;
        if (bigEndian) {
            for (int i = 0; i < bufsz; i++) {
                short y = (short) (32767. * Math.min(Math.max(dbuf[i], -1.0f), 1.0f));
                byteSound[ib] = (byte) ((y >> 8) & 0xFF);
                ib++;
                byteSound[ib] = (byte) (y & 0xFF);
                ib++;
            }
        } else {
            for (int i = 0; i < bufsz; i++) {
                short y = (short) (32767. * dbuf[i]);
                byteSound[ib] = (byte) (y & 0xFF);
                ib++;
                byteSound[ib] = (byte) ((y >> 8) & 0xFF);
                ib++;
            }
        }
    }

    /*
    static final public void floatToByte(byte[] byteSound, float [] dbuf) {
        int bufsz = dbuf.length;
        int ib=0;
        if(bigEndian) {
            for(int i=0;i<bufsz;i++) {
                short y = (short)(32767. * dbuf[i]);
                byteSound[ib] = (byte)(y >> 8);
                ib++;
                byteSound[ib] = (byte)(y & 0x00ff);
                ib++;
            }
        } else {
            for(int i=0;i<bufsz;i++) {
                short y = (short)(32767. * dbuf[i]);
                byteSound[ib] = (byte)(y & 0x00ff);
                ib++;
                byteSound[ib] = (byte)(y >> 8);
                ib++;
            }
        }
        }*/

    /** Convert byte array to float array.
        @param dbuf User provided float array to return result in.
        @param dbuf User provided byte array to convert.
        @param bufsz Sumber of float samples to write.
    */
    static final public void byteToFloat(float[] dbuf, byte[] bbuf, int bufsz) {
        if (bigEndian) {
            int ib = 0;
            for (int i = 0; i < bufsz; i++) {
                float sample = ((bbuf[ib + 0] << 8) | (bbuf[ib + 1] & 0xFF)) / 32768.0F;
                ib += 2;
                dbuf[i] = sample;
            }
        } else {
            int ib = 0;
            for (int i = 0; i < bufsz; i++) {
                float sample = ((bbuf[ib] & 0xFF) | (bbuf[ib + 1] << 8)) / 32768.0F;
                ib += 2;
                dbuf[i] = sample;
            }
        }
    }
}

    /*
    static final public  void byteToFloat(float [] dbuf, byte[] bbuf,int bufsz) {
        int ib=0;
        if(bigEndian) {
            for(int i=0;i<bufsz;i++) {
                short y = bbuf[ib];
                y = (short)(y<<8);
                y += bbuf[ib+1];
                ib += 2;
                dbuf[i] = y/32768.f;
            }
        } else {
            for(int i=0;i<bufsz;i++) {
                short y = (short)bbuf[ib+1];
                y = (short)(y<<8);
                y += bbuf[ib];
                ib += 2;
                dbuf[i] = y/32768.f;
            }
        }
    }
    
}
    */