programming-examples/java/Servlets_Session_Swing_Util/Cdda Player.java

Cdda Player

import java.io.File;
import java.io.InputStream;
import java.io.IOException;
import java.io.OutputStream;

import java.net.URL;
import java.net.MalformedURLException;

import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioFileFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.SourceDataLine;
import javax.sound.sampled.DataLine;
import javax.sound.sampled.Line;
import javax.sound.sampled.LineUnavailableException;

import org.tritonus.sampled.cdda.CddaURLStreamHandlerFactory;


/** CddaPlayer



Reads data digitally from an audio CD and plays them via Java Sound.


Advanced


java CddaPlayer


java CddaPlayer
tracknumber



tracknumber
the number of the track on the audio CD that should be played (starting with 1).


If no argument is given, the table of content is displayed.


The CDROM drive is hardcoded to '/dev/cdrom'.

It is reported that there are problems with mixed mode CDs.


CddaPlayer.java

  
*/
public class CddaPlayer
{
static
{
 URL.setURLStreamHandlerFactory(new CddaURLStreamHandlerFactory());
}

/** Flag for debugging messages.
 * If true, some messages are dumped to the console
 * during operation. 
 */
private static boolean DEBUG = false;

private static int DEFAULT_EXTERNAL_BUFFER_SIZE = 128000;



public static void main(String[] args)
{
 int nExternalBufferSize = DEFAULT_EXTERNAL_BUFFER_SIZE;
 int nInternalBufferSize = AudioSystem.NOT_SPECIFIED;

 /** CDROM drive number.
  Defaults to first drive. [how is the order constituted?]
  Not used for now. Hardcoded default to /dev/cdrom.
 */
 int  nDrive = 0;

 boolean  bTocOnly = true;
 int  nTrack = 0;

 if (args.length < 1)
 {
  bTocOnly = true;
 }
 else if (args.length == 1)
 {
  nTrack = Integer.parseInt(args[0]);
  bTocOnly = false;
 }

 // TODO: should not be hardcoded
 String strDrive = "/dev/cdrom";

 if (bTocOnly)
 {
  URL tocURL = null;
  try
  {
   tocURL = new URL("cdda:" + strDrive);
  }
  catch (MalformedURLException e)
  {
   e.printStackTrace();
  }
  InputStream tocInputStream = null;
  try
  {
   tocInputStream = tocURL.openStream();
  }
  catch (IOException e)
  {
   e.printStackTrace();
  }
  output(tocInputStream);
 }

  if (! bTocOnly)
 {
  URL trackURL = null;
  try
  {
   trackURL = new URL("cdda://" + strDrive + "#" + nTrack);
  }
  catch (MalformedURLException e)
  {
   e.printStackTrace();
  }
  InputStream trackInputStream = null;
  try
  {
   trackInputStream = trackURL.openStream();
  }
  catch (IOException e)
  {
   e.printStackTrace();
  }

  AudioInputStream audioInputStream = (AudioInputStream) trackInputStream;

   SourceDataLine line = null;
   AudioFormat audioFormat = audioInputStream.getFormat();
   Line.Info info = new DataLine.Info(SourceDataLine.class, audioFormat);

   try
   {
    line = (SourceDataLine) AudioSystem.getLine(info);
    line.open();
    line.start();
   }
   catch (LineUnavailableException e)
   {
    e.printStackTrace();
   }

  int nBytesRead = 0;
  byte[] abData = new byte[nExternalBufferSize];
  while (nBytesRead != -1)
  {
   try
   {
    nBytesRead = audioInputStream.read(abData, 0, abData.length);
   }
   catch (IOException e)
   {
    e.printStackTrace();
   }
   if (DEBUG)
   {
    out("AudioPlayer.main(): read from AudioInputStream (bytes): " + nBytesRead);
   }
   if (nBytesRead >= 0)
   {
    int nBytesWritten = line.write(abData, 0, nBytesRead);
    if (DEBUG)
    {
     out("AudioPlayer.main(): written to SourceDataLine (bytes): " + nBytesWritten);
    }
   }
  }
 }
}


private static void output(InputStream inputStream)
{
 byte[] buffer = new byte[4096];
 OutputStream outputStream = System.out;

 try
 {
  int nBytesRead = 0;
  nBytesRead = inputStream.read(buffer);
  while (nBytesRead >= 0)
  {
   outputStream.write(buffer, 0, nBytesRead);
   nBytesRead = inputStream.read(buffer);
  }
 }
 catch (IOException e)
 {
  e.printStackTrace();
 }
}


private static void out(String strMessage)
{
 System.out.println(strMessage);
}
}

/*** CddaPlayer.java ****/
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