Reputation: 435
My goal is to play an mp3 file from Java. With every approach that I took, it always fails with a LineUnavailableException
.
AudioInputStream inputStream = AudioSystem.getAudioInputStream(new URL("http://localhost:8080/agriserver/facebook/sound/test6.mp3"));
Clip clip = AudioSystem.getClip(info);
clip.open(inputStream);
clip.start();
Failed attempts to fix it:
Here is the exception:
Exception in thread "main" javax.sound.sampled.LineUnavailableException: line with format MPEG1L3 48000.0 Hz, unknown bits per sample, stereo, unknown frame size, 41.666668 frames/second, not supported. at com.sun.media.sound.DirectAudioDevice$DirectDL.implOpen(DirectAudioDevice.java:494) at com.sun.media.sound.DirectAudioDevice$DirectClip.implOpen(DirectAudioDevice.java:1280) at com.sun.media.sound.AbstractDataLine.open(AbstractDataLine.java:107) at com.sun.media.sound.DirectAudioDevice$DirectClip.open(DirectAudioDevice.java:1061) at com.sun.media.sound.DirectAudioDevice$DirectClip.open(DirectAudioDevice.java:1151) at Demo.playMp3(Demo.java:83)
Upvotes: 4
Views: 1473
Reputation: 435
Apparently, the mp3 has to be read into one stream. That stream has to be read into a second stream to decode it. The below code worked:
// read the file
AudioInputStream rawInput = AudioSystem.getAudioInputStream(new ByteArrayInputStream(data));
// decode mp3
AudioFormat baseFormat = rawInput.getFormat();
AudioFormat decodedFormat = new AudioFormat(
AudioFormat.Encoding.PCM_SIGNED, // Encoding to use
baseFormat.getSampleRate(), // sample rate (same as base format)
16, // sample size in bits (thx to Javazoom)
baseFormat.getChannels(), // # of Channels
baseFormat.getChannels()*2, // Frame Size
baseFormat.getSampleRate(), // Frame Rate
false // Big Endian
);
AudioInputStream decodedInput = AudioSystem.getAudioInputStream(decodedFormat, rawInput);
Upvotes: 3
Reputation: 24375
OK - Let's start by ruling out your MP3 files and your code.
I tested this and it works fine.
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import javazoom.jl.player.Player;
public class MP3 {
private String filename;
private Player player;
// constructor that takes the name of an MP3 file
public MP3(String filename) {
this.filename = filename;
}
public void close() { if (player != null) player.close(); }
// play the MP3 file to the sound card
public void play() {
try {
FileInputStream fis = new FileInputStream(filename);
BufferedInputStream bis = new BufferedInputStream(fis);
player = new Player(bis);
}
catch (Exception e) {
System.out.println("Problem playing file " + filename);
System.out.println(e);
}
// run in new thread to play in background
new Thread() {
public void run() {
try { player.play(); }
catch (Exception e) { System.out.println(e); }
}
}.start();
}
// test client
public static void main(String[] args) {
String filename = args[0];
MP3 mp3 = new MP3(filename);
mp3.play();
}
}
Upvotes: 2