Question

Can you please suggest that how can i write a piece that plays a song.?

I tried the following snippet but i get the this exception:

import sun.audio.*;
import java.io.*;

class tester {
 public static void main(String args[]) throws Exception {
  InputStream in=new FileInputStream("tester.mp3");
  AudioStream as=new AudioStream(in);
  AudioPlayer.player.start(as);
 }
}

Answer 1

As mentioned, Java Sound does not support MP3 by default. For the types it does support in any specific JRE, check AudioSystem.getAudioFileTypes().

One way to add support for reading MP3 is to add the JMF based mp3plugin.jar¹ to the application’s run-time class-path.

1. That link is known to be less than entirely reliable. The Jar is also available at my software share drive.

As to your actual question, while a javax.sound.sampled.Clip might seem ideal for this kind of task, it unfortunately will only hold a second of stereo, 16 bit, 44.1KHz sound. That is why I developed BigClip. (Which has its own problems with looping, if you fix them, report back.)

package org.pscode.xui.sound.bigclip;

import java.awt.Component;
import javax.swing.*;

// J2SE 1.3
import javax.sound.sampled.*;

import java.io.*;

// J2SE 1.4
import java.util.logging.*;

import java.util.Arrays;

/** An implementation of the javax.sound.sampled.Clip that is designed
to handle Clips of arbitrary size, limited only by the amount of memory
available to the app.    It uses the post 1.4 thread behaviour (daemon thread)
that will stop the sound running after the main has exited.
<ul>
<li>2012-07-24 - Fixed bug in size of byte array (2^16 -> (int)Math.pow(2, 16)).
<li>2009-09-01 - Fixed bug that had clip ..clipped at the end, by calling drain() (before
calling stop()) on the dataline after the play loop was complete. Improvement to frame
and microsecond position determination.
<li>2009-08-17 - added convenience constructor that accepts a Clip. Changed the private
convertFrameToM..seconds methods from 'micro' to 'milli' to reflect that they were dealing
with units of 1000/th of a second.
<li>2009-08-14 - got rid of flush() after the sound loop, as it was cutting off tracks just
before the end, and was found to be not needed for the fast-forward/rewind functionality it
was introduced to support.
<li>2009-08-11 - First binary release.
</ul>
N.B. Remove @Override notation and logging to use in 1.3+
@since 1.5
@version 2009-08-17
@author Andrew Thompson */
public class BigClip implements Clip, LineListener {

    /** The DataLine used by this Clip. */
    private SourceDataLine dataLine;

    /** The raw bytes of the audio data. */
    private byte[] audioData;

    /** The stream wrapper for the audioData. */
    private ByteArrayInputStream inputStream;

    /** Loop count set by the calling code. */
    private int loopCount;
    /** Internal count of how many loops to go. */
    private int countDown;
    /** The start of a loop point.    Defaults to 0. */
    private int loopPointStart;
    /** The end of a loop point.    Defaults to the end of the Clip. */
    private int loopPointEnd;

    /** Stores the current frame position of the clip. */
    private int framePosition;

    /** Thread used to run() sound. */
    private Thread thread;
    /** Whether the sound is currently playing or active. */
    private boolean active;
    /** Stores the last time bytes were dumped to the audio stream. */
    private long timelastPositionSet;

    private int bufferUpdateFactor = 2;

    /** The parent Component for the loading progress dialog.    */
    Component parent = null;

    /** Used for reporting messages. */
    private Logger logger = Logger.getAnonymousLogger();

    /** Default constructor for a BigClip.    Does nothing.    Information from the
    AudioInputStream passed in open() will be used to get an appropriate SourceDataLine. */
    public BigClip() {}

    /** There are a number of AudioSystem methods that will return a configured Clip.    This
    convenience constructor allows us to obtain a SourceDataLine for the BigClip that uses
    the same AudioFormat as the original Clip.
    @param clip Clip The Clip used to configure the BigClip. */
    public BigClip(Clip clip) throws LineUnavailableException {
        dataLine = AudioSystem.getSourceDataLine( clip.getFormat() );
    }

    /** Provides the entire audio buffer of this clip.
    @return audioData byte[] The bytes of the audio data that is loaded in this Clip. */
    public byte[] getAudioData() {
        return audioData;
    }

    /** Sets a parent component to act as owner of a "Loading track.." progress dialog.
    If null, there will be no progress shown. */
    public void setParentComponent(Component parent) {
        this.parent = parent;
    }

    /** Converts a frame count to a duration in milliseconds. */
    private long convertFramesToMilliseconds(int frames) {
        return (frames/(long)dataLine.getFormat().getSampleRate())*1000;
    }

    /** Converts a duration in milliseconds to a frame count. */
    private int convertMillisecondsToFrames(long milliseconds) {
        return (int)(milliseconds/dataLine.getFormat().getSampleRate());
    }

    @Override
    public void update(LineEvent le) {
        logger.log(Level.FINEST, "update: " + le );
    }

    @Override
    public void loop(int count) {
        logger.log(Level.FINEST, "loop(" + count + ") - framePosition: " + framePosition);
        loopCount = count;
        countDown = count;
        active = true;
        inputStream.reset();

        start();
    }

    @Override
    public void setLoopPoints(int start, int end) {
        if (
            start<0 ||
            start>audioData.length-1 ||
            end<0 ||
            end>audioData.length
            ) {
            throw new IllegalArgumentException(
                "Loop points '" +
                start +
                "' and '" +
                end +
                "' cannot be set for buffer of size " +
                audioData.length);
        }
        if (start>end) {
            throw new IllegalArgumentException(
                "End position " +
                end +
                " preceeds start position " + start);
        }

        loopPointStart = start;
        framePosition = loopPointStart;
        loopPointEnd = end;
    }

    @Override
    public void setMicrosecondPosition(long milliseconds) {
        framePosition = convertMillisecondsToFrames(milliseconds);
    }

    @Override
    public long getMicrosecondPosition() {
        return convertFramesToMilliseconds(getFramePosition());
    }

    @Override
    public long getMicrosecondLength() {
        return convertFramesToMilliseconds(getFrameLength());
    }

    @Override
    public void setFramePosition(int frames) {
        framePosition = frames;
        int offset = framePosition*format.getFrameSize();
        try {
            inputStream.reset();
            inputStream.read(new byte[offset]);
        } catch(Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    public int getFramePosition() {
        long timeSinceLastPositionSet = System.currentTimeMillis() - timelastPositionSet;
        int size = dataLine.getBufferSize()*(format.getChannels()/2)/bufferUpdateFactor;
        int framesSinceLast = (int)((timeSinceLastPositionSet/1000f)*
            dataLine.getFormat().getFrameRate());
        int framesRemainingTillTime = size - framesSinceLast;
        return framePosition
            - framesRemainingTillTime;
    }

    @Override
    public int getFrameLength() {
        return audioData.length/format.getFrameSize();
    }

    AudioFormat format;

    @Override
    public void open(AudioInputStream stream) throws
        IOException,
        LineUnavailableException {

        AudioInputStream is1;
        format = stream.getFormat();

        if (format.getEncoding()!=AudioFormat.Encoding.PCM_SIGNED) {
            is1 = AudioSystem.getAudioInputStream(
                AudioFormat.Encoding.PCM_SIGNED, stream );
        } else {
            is1 = stream;
        }
        format = is1.getFormat();
        InputStream is2;
        if (parent!=null) {
            ProgressMonitorInputStream pmis = new ProgressMonitorInputStream(
                parent,
                "Loading track..",
                is1);
            pmis.getProgressMonitor().setMillisToPopup(0);
            is2 = pmis;
        } else {
            is2 = is1;
        }

        byte[] buf = new byte[ (int)Math.pow(2, 16) ];
        int totalRead = 0;
        int numRead = 0;
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        numRead = is2.read( buf );
        while (numRead>-1) {
            baos.write( buf, 0, numRead );
            numRead = is2.read( buf, 0, buf.length );
            totalRead += numRead;
        }
        is2.close();
        audioData = baos.toByteArray();
        AudioFormat afTemp;
        if (format.getChannels()<2) {
            afTemp = new AudioFormat(
                format.getEncoding(),
                format.getSampleRate(),
                format.getSampleSizeInBits(),
                2,
                format.getSampleSizeInBits()*2/8, // calculate frame size
                format.getFrameRate(),
                format.isBigEndian()
                );
        } else {
            afTemp = format;
        }

        setLoopPoints(0,audioData.length);
        dataLine = AudioSystem.getSourceDataLine(afTemp);
        dataLine.open();
        inputStream = new ByteArrayInputStream( audioData );
    }

    @Override
    public void open(AudioFormat format,
        byte[] data,
        int offset,
        int bufferSize)
        throws LineUnavailableException {
        byte[] input = new byte[bufferSize];
        for (int ii=0; ii<input.length; ii++) {
            input[ii] = data[offset+ii];
        }
        ByteArrayInputStream inputStream = new ByteArrayInputStream(input);
        try {
            AudioInputStream ais1 = AudioSystem.getAudioInputStream(inputStream);
            AudioInputStream ais2 = AudioSystem.getAudioInputStream(format, ais1);
            open(ais2);
        } catch( UnsupportedAudioFileException uafe ) {
            throw new IllegalArgumentException(uafe);
        } catch( IOException ioe ) {
            throw new IllegalArgumentException(ioe);
        }
        // TODO    -    throw IAE for invalid frame size, format.
    }

    @Override
    public float getLevel() {
        return dataLine.getLevel();
    }

    @Override
    public long getLongFramePosition() {
        return dataLine.getLongFramePosition()*2/format.getChannels();
    }

    @Override
    public int available() {
        return dataLine.available();
    }

    @Override
    public int getBufferSize() {
        return dataLine.getBufferSize();
    }

    @Override
    public AudioFormat getFormat() {
        return format;
    }

    @Override
    public boolean isActive() {
        return dataLine.isActive();
    }

    @Override
    public boolean isRunning() {
        return dataLine.isRunning();
    }

    @Override
    public boolean isOpen() {
        return dataLine.isOpen();
    }

    @Override
    public void stop() {
        logger.log(Level.FINEST, "BigClip.stop()");
        active = false;
        // why did I have this commented out?
        dataLine.stop();
        if (thread!=null) {
            try {
                active = false;
                thread.join();
            } catch(InterruptedException wakeAndContinue) {
            }
        }
    }

    public byte[] convertMonoToStereo(byte[] data, int bytesRead) {
        byte[] tempData = new byte[bytesRead*2];
        if (format.getSampleSizeInBits()==8) {
            for(int ii=0; ii<bytesRead; ii++) {
                byte b = data[ii];
                tempData[ii*2] = b;
                tempData[ii*2+1] = b;
            }
        } else {
            for(int ii=0; ii<bytesRead-1; ii+=2) {
                //byte b2 = is2.read();
                byte b1 = data[ii];
                byte b2 = data[ii+1];
                tempData[ii*2] = b1;
                tempData[ii*2+1] = b2;
                tempData[ii*2+2] = b1;
                tempData[ii*2+3] = b2;
            }
        }
        return tempData;
    }

    boolean fastForward;
    boolean fastRewind;

    public void setFastForward(boolean fastForward) {
        logger.log(Level.FINEST, "FastForward " + fastForward);
        this.fastForward = fastForward;
        fastRewind = false;
        flush();
    }

    public boolean getFastForward() {
        return fastForward;
    }

    public void setFastRewind(boolean fastRewind) {
        logger.log(Level.FINEST, "FastRewind " + fastRewind);
        this.fastRewind = fastRewind;
        fastForward = false;
        flush();
    }

    public boolean getFastRewind() {
        return fastRewind;
    }

    /** TODO - fix bug in LOOP_CONTINUOUSLY */
    @Override
    public void start() {
        Runnable r = new Runnable() {
            public void run() {
                try {
                    /* Should these open()/close() calls be here, or explicitly
                    called by user program?    The JavaDocs for line suggest that
                    Clip should throw an IllegalArgumentException, so we'll
                    stick with that and call it explicitly. */
                    dataLine.open();

                    dataLine.start();
                    int bytesRead = 0;
                    int frameSize = dataLine.getFormat().getFrameSize();
                    int bufSize = dataLine.getBufferSize();
                    boolean startOrMove = true;
                    byte[] data = new byte[bufSize];
                    int offset = framePosition*frameSize;
                    int totalBytes = offset;
                    inputStream.read(new byte[offset], 0, offset);
                    logger.log(Level.FINEST, "loopCount " + loopCount );
                    while ((bytesRead = inputStream.read(data,0,data.length))
                        != -1 &&
                        (loopCount==Clip.LOOP_CONTINUOUSLY ||
                        countDown>0) &&
                        active ) {
                        logger.log(Level.FINEST,
                            "BigClip.start() loop " + framePosition );
                        totalBytes += bytesRead;
                        int framesRead;
                        byte[] tempData;
                        if (format.getChannels()<2) {
                            tempData = convertMonoToStereo(data, bytesRead);
                            framesRead = bytesRead/
                                format.getFrameSize();
                            bytesRead*=2;
                        } else {
                            framesRead = bytesRead/
                                dataLine.getFormat().getFrameSize();
                            tempData = Arrays.copyOfRange(data, 0, bytesRead);
                        }
                        framePosition += framesRead;
                        if (framePosition>=loopPointEnd) {
                            framePosition = loopPointStart;
                            inputStream.reset();
                            countDown--;
                            logger.log(Level.FINEST,
                                "Loop Count: " + countDown );
                        }
                        timelastPositionSet = System.currentTimeMillis();
                        byte[] newData;
                        if (fastForward) {
                            newData = getEveryNthFrame(tempData, 2);
                        } else if (fastRewind) {
                            byte[] temp = getEveryNthFrame(tempData, 2);
                            newData = reverseFrames(temp);
                            inputStream.reset();
                            totalBytes -= 2*bytesRead;
                        framePosition -= 2*framesRead;
                            if (totalBytes<0) {
                                setFastRewind(false);
                                totalBytes = 0;
                            }
                            inputStream.skip(totalBytes);
                            logger.log(Level.INFO, "totalBytes " + totalBytes);
                        } else {
                            newData = tempData;
                        }
                        dataLine.write(newData, 0, newData.length);
                        if (startOrMove) {
                            data = new byte[bufSize/
                                bufferUpdateFactor];
                            startOrMove = false;
                        }
                    }
                    logger.log(Level.FINEST,
                        "BigClip.start() loop ENDED" + framePosition );
                    active = false;
                    dataLine.drain();
                    dataLine.stop();
                    /* should these open()/close() be here, or explicitly
                    called by user program? */
                    dataLine.close();
                } catch (LineUnavailableException lue) {
                    logger.log( Level.SEVERE,
                        "No sound line available!", lue );
                    if (parent!=null) {
                        JOptionPane.showMessageDialog(
                            parent,
                            "Clear the sound lines to proceed",
                            "No audio lines available!",
                            JOptionPane.ERROR_MESSAGE);
                    }
                }
            }
        };
        thread= new Thread(r);
        // makes thread behaviour compatible with JavaSound post 1.4
        thread.setDaemon(true);
        thread.start();
    }

    /** Assume the frame size is 4. */
    public byte[] reverseFrames(byte[] data) {
        byte[] reversed = new byte[data.length];
        byte[] frame = new byte[4];

        for (int ii=0; ii<data.length/4; ii++) {
            int first = (data.length)-((ii+1)*4)+0;
            int last = (data.length)-((ii+1)*4)+3;
            frame[0] = data[first];
            frame[1] = data[(data.length)-((ii+1)*4)+1];
            frame[2] = data[(data.length)-((ii+1)*4)+2];
            frame[3] = data[last];

            reversed[ii*4+0] = frame[0];
            reversed[ii*4+1] = frame[1];
            reversed[ii*4+2] = frame[2];
            reversed[ii*4+3] = frame[3];
            if (ii<5 || ii>(data.length/4)-5) {
                logger.log(Level.FINER, "From \t" + first + " \tlast " + last );
                logger.log(Level.FINER, "To \t" + ((ii*4)+0) + " \tlast " + ((ii*4)+3) );
            }
        }

/*
        for (int ii=0; ii<data.length; ii++) {
            reversed[ii] = data[data.length-1-ii];
        }
*/

        return reversed;
    }

    /** Assume the frame size is 4. */
    public byte[] getEveryNthFrame(byte[] data, int skip) {
        int length = data.length/skip;
        length = (length/4)*4;
        logger.log(Level.FINEST, "length " + data.length + " \t" + length);
        byte[] b = new byte[length];
        //byte[] frame = new byte[4];
        for (int ii=0; ii<b.length/4; ii++) {
            b[ii*4+0] = data[ii*skip*4+0];
            b[ii*4+1] = data[ii*skip*4+1];
            b[ii*4+2] = data[ii*skip*4+2];
            b[ii*4+3] = data[ii*skip*4+3];
        }
        return b;
    }

    @Override
    public void flush() {
        dataLine.flush();
    }

    @Override
    public void drain() {
        dataLine.drain();
    }

    @Override
    public void removeLineListener(LineListener listener) {
        dataLine.removeLineListener(listener);
    }

    @Override
    public void addLineListener(LineListener listener) {
        dataLine.addLineListener(listener);
    }

    @Override
    public Control getControl(Control.Type control) {
        return dataLine.getControl(control);
    }

    @Override
    public Control[] getControls() {
        if (dataLine==null) {
            return new Control[0];
        } else {
            return dataLine.getControls();
        }
    }

    @Override
    public boolean isControlSupported(Control.Type control) {
        return dataLine.isControlSupported(control);
    }

    @Override
    public void close() {
        dataLine.close();
    }

    @Override
    public void open() throws LineUnavailableException {
        throw new IllegalArgumentException("illegal call to open() in interface Clip");
    }

    @Override
    public Line.Info getLineInfo() {
        return dataLine.getLineInfo();
    }

    /** Determines the single largest sample size of all channels of the current clip.
    This can be handy for determining a fraction to scal visual representations.
    @return Double between 0 & 1 representing the maximum signal level of any channel. */
    public double getLargestSampleSize() {

        int largest = 0;
        int current;

        boolean signed = (format.getEncoding()==AudioFormat.Encoding.PCM_SIGNED);
        int bitDepth = format.getSampleSizeInBits();
        boolean bigEndian = format.isBigEndian();

        int samples = audioData.length*8/bitDepth;

        if (signed) {
            if (bitDepth/8==2) {
                if (bigEndian) {
                    for (int cc = 0; cc < samples; cc++) {
                        current = (audioData[cc*2]*256 + (audioData[cc*2+1] & 0xFF));
                        if (Math.abs(current)>largest) {
                            largest = Math.abs(current);
                        }
                    }
                } else {
                    for (int cc = 0; cc < samples; cc++) {
                        current = (audioData[cc*2+1]*256 + (audioData[cc*2] & 0xFF));
                        if (Math.abs(current)>largest) {
                            largest = Math.abs(current);
                        }
                    }
                }
            } else {
                for (int cc = 0; cc < samples; cc++) {
                    current = (audioData[cc] & 0xFF);
                    if (Math.abs(current)>largest) {
                        largest = Math.abs(current);
                    }
                }
            }
        } else {
            if (bitDepth/8==2) {
                if (bigEndian) {
                    for (int cc = 0; cc < samples; cc++) {
                        current = (audioData[cc*2]*256 + (audioData[cc*2+1] - 0x80));
                        if (Math.abs(current)>largest) {
                            largest = Math.abs(current);
                        }
                    }
                } else {
                    for (int cc = 0; cc < samples; cc++) {
                        current = (audioData[cc*2+1]*256 + (audioData[cc*2] - 0x80));
                        if (Math.abs(current)>largest) {
                            largest = Math.abs(current);
                        }
                    }
                }
            } else {
                for (int cc = 0; cc < samples; cc++) {
                    if ( audioData[cc]>0 ) {
                        current = (audioData[cc] - 0x80);
                        if (Math.abs(current)>largest) {
                            largest = Math.abs(current);
                        }
                    } else {
                        current = (audioData[cc] + 0x80);
                        if (Math.abs(current)>largest) {
                            largest = Math.abs(current);
                        }
                    }
                }
            }
        }

        // audioData
        logger.log(Level.FINEST, "Max signal level: " + (double)largest/(Math.pow(2, bitDepth-1)));
        return (double)largest/(Math.pow(2, bitDepth-1));
    }
}