问题
I have set mp3plugin.jar in the run time libraries needed in my netbeans project .But still i get the above exception when i try to play mp3 file.What is the reason for this :
import java.io.File;
import java.io.IOException;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.DataLine;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.SourceDataLine;
public class tester_1 {
private static final int EXTERNAL_BUFFER_SIZE = 128000;
public static void main(String[] args)
{
/*
We check that there is exactely one command-line
argument.
If not, we display the usage message and exit.
*/
/*
Now, that we're shure there is an argument, we
take it as the filename of the soundfile
we want to play.
*/
String strFilename = "mp3tester.mp3";
File soundFile = new File("mp3tester.mp3");
/*
We have to read in the sound file.
*/
AudioInputStream audioInputStream = null;
try
{
audioInputStream = AudioSystem.getAudioInputStream(soundFile);
}
catch (Exception e)
{
/*
In case of an exception, we dump the exception
including the stack trace to the console output.
Then, we exit the program.
*/
e.printStackTrace();
System.exit(1);
}
/*
From the AudioInputStream, i.e. from the sound file,
we fetch information about the format of the
audio data.
These information include the sampling frequency,
the number of
channels and the size of the samples.
These information
are needed to ask Java Sound for a suitable output line
for this audio file.
*/
AudioFormat audioFormat = audioInputStream.getFormat();
/*
Asking for a line is a rather tricky thing.
We have to construct an Info object that specifies
the desired properties for the line.
First, we have to say which kind of line we want. The
possibilities are: SourceDataLine (for playback), Clip
(for repeated playback) and TargetDataLine (for
recording).
Here, we want to do normal playback, so we ask for
a SourceDataLine.
Then, we have to pass an AudioFormat object, so that
the Line knows which format the data passed to it
will have.
Furthermore, we can give Java Sound a hint about how
big the internal buffer for the line should be. This
isn't used here, signaling that we
don't care about the exact size. Java Sound will use
some default value for the buffer size.
*/
SourceDataLine line = null;
DataLine.Info info = new DataLine.Info(SourceDataLine.class,
audioFormat);
try
{
line = (SourceDataLine) AudioSystem.getLine(info);
/*
The line is there, but it is not yet ready to
receive audio data. We have to open the line.
*/
line.open(audioFormat);
}
catch (LineUnavailableException e)
{
e.printStackTrace();
System.exit(1);
}
catch (Exception e)
{
e.printStackTrace();
System.exit(1);
}
/*
Still not enough. The line now can receive data,
but will not pass them on to the audio output device
(which means to your sound card). This has to be
activated.
*/
line.start();
/*
Ok, finally the line is prepared. Now comes the real
job: we have to write data to the line. We do this
in a loop. First, we read data from the
AudioInputStream to a buffer. Then, we write from
this buffer to the Line. This is done until the end
of the file is reached, which is detected by a
return value of -1 from the read method of the
AudioInputStream.
*/
int nBytesRead = 0;
byte[] abData = new byte[EXTERNAL_BUFFER_SIZE];
while (nBytesRead != -1)
{
try
{
nBytesRead = audioInputStream.read(abData, 0, abData.length);
}
catch (IOException e)
{
e.printStackTrace();
}
if (nBytesRead >= 0)
{
int nBytesWritten = line.write(abData, 0, nBytesRead);
}
}
/*
Wait until all data are played.
This is only necessary because of the bug noted below.
(If we do not wait, we would interrupt the playback by
prematurely closing the line and exiting the VM.)
Thanks to Margie Fitch for bringing me on the right
path to this solution.
*/
line.drain();
/*
All data are played. We can close the shop.
*/
line.close();
/*
There is a bug in the jdk1.3/1.4.
It prevents correct termination of the VM.
So we have to exit ourselves.
*/
System.exit(0);
}
private static void printUsageAndExit()
{
out("tester_1: usage:");
out("\tjava tester_1 <soundfile>");
System.exit(1);
}
private static void out(String strMessage)
{
System.out.println(strMessage);
}
}
when i run this program i get the following exception :
java.lang.IllegalArgumentException: No line matching interface SourceDataLine supporting format MPEG1L3 44100.0 Hz, unknown bits per sample, stereo, unknown frame size, unknown frame rate, is supported.
at javax.sound.sampled.AudioSystem.getLine(AudioSystem.java:476)
at mp3tester_mp3plugin.tester_1.main(tester_1.java:178)
Java Result: 1
What is the reason i am getting this error ?
回答1:
import java.io.File;
import javax.media.Format;
import javax.media.Manager;
import javax.media.MediaLocator;
import javax.media.Player;
import javax.media.PlugInManager;
import javax.media.format.AudioFormat;
public class AudioTest {
public static void main(String[] args) {
Format input1 = new AudioFormat(AudioFormat.MPEGLAYER3);
Format input2 = new AudioFormat(AudioFormat.MPEG);
Format output = new AudioFormat(AudioFormat.LINEAR);
PlugInManager.addPlugIn(
"com.sun.media.codec.audio.mp3.JavaDecoder",
new Format[]{input1, input2},
new Format[]{output},
PlugInManager.CODEC
);
try{
Player player = Manager.createPlayer(new MediaLocator(new File("mp3tester.mp3").toURI().toURL()));
player.start();
}
catch(Exception ex){
ex.printStackTrace();
}
}
}
Courtsey of morgenstille.at.
Cheers, Wim
PS Oracle 'hid' the JMF library here.
Edit: To actually answer your question: javax.sound has issues with playing 'some' mp3 formats, while javax.media and the mp3 plugin will have less (no?) issues. It might be worthwile to check API's like JavaZoom or others for your mp3 needs.
回答2:
I was getting the same error on Linux system. The workaround for me was to run it as root. Probably, I need to sort out some device permissions.
来源：https://stackoverflow.com/questions/6884974/why-do-i-get-java-lang-illegalargumentexception-no-line-matching-interface-sour