[英]LineUnavailableException for playing mp3 with java
My goal is to play an mp3 file from Java. 我的目标是从Java播放mp3文件。 With every approach that I took, it always fails with a
LineUnavailableException
. 对于我采用的每种方法,它总是因
LineUnavailableException
失败。
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: 修复它的尝试失败:
Here is the exception: 这是一个例外:
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)
Apparently, the mp3 has to be read into one stream. 显然,mp3必须被读入一个流。 That stream has to be read into a second stream to decode it.
必须将该流读入第二个流以对其进行解码。 The below code worked:
以下代码有效:
// 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);
OK - Let's start by ruling out your MP3 files and your code. 好的 - 让我们首先排除你的MP3文件和你的代码。
I tested this and it works fine. 我测试了它,它工作正常。
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(); }
} }
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