使用java播放mp3的LineUnavailableException [英] LineUnavailableException for playing mp3 with java

问题描述

我的目标是从Java播放mp3文件。对于我采用的每种方法，它总是以 LineUnavailableException 失败。

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();

尝试修复失败：

• 使用Sun的mp3插件。


• 使用Jlayer第三方库


• 使用Tritonus第三方库


• 使用Sony Sound Forge，Adobe Sound Booth重新编码mp3，一切顺利


• 使用不同的编码率和采样率重新编码mp3


• 尝试使用JMF


• 使用来自互联网的随机mp3在其他应用程序中正常播放


• 阅读具有相同错误的帖子。所有帖子都没有帮助解决问题的答案。

• Use Sun's mp3 plugin.
• Use Jlayer 3rd party library
• Use Tritonus 3rd party library
• Re-encode the mp3 with Sony Sound Forge, Adobe Sound Booth, all no luck
• Re-encode the mp3 with different encode rates and sampling rates
• Try to use JMF
• Use random mp3 from the Internet that plays fine in other applications
• Read postings with the same error. None of the postings have an answer that helped resolve the issue.

以下是例外情况：

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)

推荐答案

显然，必须将mp3读入一个流。必须将该流读入第二个流以对其进行解码。以下代码有效：

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);

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