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jeremybenn |
/* AudioPlayerSample.java -- Simple Java Audio Player
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Copyright (C) 2007 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.classpath.examples.sound;
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import java.io.File;
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import java.io.IOException;
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import java.util.Map;
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import javax.sound.sampled.AudioFormat;
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import javax.sound.sampled.AudioInputStream;
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import javax.sound.sampled.AudioSystem;
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import javax.sound.sampled.DataLine;
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import javax.sound.sampled.LineUnavailableException;
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import javax.sound.sampled.SourceDataLine;
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import javax.sound.sampled.UnsupportedAudioFileException;
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/**
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* A simple demo to show the use of the Java Sound API.
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* It plays the given file (up to the end, so don't pass the 26 minutes long
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* Pink Floyd's Echoes unless you really want!!).
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*
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* See: http://jsresources.org/examples/SimpleAudioPlayer.java.html
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*
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* @author Mario Torre <neugens@limasoftware.net>
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*/
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public class AudioPlayerSample
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{
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private static final int EXTERNAL_BUFFER_SIZE = 128000;
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/**
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* @param args
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*/
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public static void main(String[] args)
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{
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if (args.length < 1)
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{
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System.out.println("Radio Classpath -: Usage: " +
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"AudioPlayerSample [file]");
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return;
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}
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String file = args[0];
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System.out.println("Welcome to Radio Classpath, only great music for you!");
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System.out.println("Today's DJ Tap The WaterDroplet");
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// now create the AudioInputStream
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AudioInputStream audioInputStream = null;
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try
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{
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audioInputStream = AudioSystem.getAudioInputStream(new File(file));
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}
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catch (UnsupportedAudioFileException e)
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{
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// This happen when the subsystem is unable to parse the kind of
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// audio file we are submitting
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// See the README for supported audio file types under Classpath
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// for the version you are using.
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e.printStackTrace();
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return;
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}
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catch (IOException e)
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{
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e.printStackTrace();
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return;
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}
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// get informations about the kind of file we are about to play
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AudioFormat audioFormat = audioInputStream.getFormat();
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System.out.println("Playing file: " + file);
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System.out.println("format: " + audioFormat.toString());
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System.out.print("Additional properties: ");
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// now, we try to get all the properties we have in this AudioFormat
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// and display them
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Map<String, Object> properties = audioFormat.properties();
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if (properties.size() < 0)
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{
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System.out.println("none");
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}
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else
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{
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System.out.println("found #" + properties.size() + " properties");
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for (String key : properties.keySet())
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{
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System.out.println(key + ": " + properties.get(key));
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}
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}
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// let's setup things for playing
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// first, we require a Line. As we are doing playing, we will ask for a
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// SourceDataLine
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SourceDataLine line = null;
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// To get the source line, we first need to build an Info object
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// this is done in one line:
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DataLine.Info info = new DataLine.Info(SourceDataLine.class, audioFormat);
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System.out.println("searching line...");
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// usually, if a backend can parse a file type, it can also
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// create a line to handle it, but that's not guaranteed
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// so we need to take care and to handle a possible
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// LineUnavailableException
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try
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{
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line = (SourceDataLine) AudioSystem.getLine(info);
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System.out.println("line found, opening...");
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// once created, a line must be opened to let data flow
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// though it.
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line.open(audioFormat);
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}
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catch (LineUnavailableException e)
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{
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// in a real application you should signal that in a kindly way to
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// your users
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e.printStackTrace();
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return;
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}
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catch (Exception e)
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{
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e.printStackTrace();
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return;
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}
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// an open line pass data to the backend only when it is in
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// a state called "started" ("playing" or "play" in some other
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// framework)
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System.out.print("starting line... ");
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line.start();
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System.out.println("done");
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// now we can start reading data from the AudioStream and writing
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// data to the pipeline. The Java Sound API is rather low level
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// so let you pass up to one byte of data at a time
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// (with some constraints, refer to the API documentation to know more)
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// We will do some buffering. You may want to check the frame size
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// to allow a better buffering, also.
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System.out.println("now playing...");
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int nBytesRead = 0;
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byte[] abData = new byte[EXTERNAL_BUFFER_SIZE];
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while (nBytesRead != - 1)
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{
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try
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{
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nBytesRead = audioInputStream.read(abData, 0, abData.length);
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}
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catch (IOException e)
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{
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e.printStackTrace();
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}
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if (nBytesRead >= 0)
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{
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// this method returns the number of bytes actuall written
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// to the line. You may want to use this number to check
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// for events, display the current position (give also a
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// look to the API for other ways of doing that) etc..
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line.write(abData, 0, nBytesRead);
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}
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}
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System.out.print("stream finished, draining line... ");
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// call this method to ensure that all the data in the internal buffer
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// reach the audio backend, otherwise your application will
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// cut the last frames of audio data (and users will not enjoy the last
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// seconds of their precious music)
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line.drain();
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// Once done, we can close the line. Note that a line, once closed
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// may not be reopened (depends on the backend, in some cases a "reopen",
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// if allowed, really opens a new line, reallocating all the resources)
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System.out.println("line drained, now exiting");
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line.close();
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System.out.println("We hope you enjoyed Radio Classpath!");
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}
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}
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