第一次播放 ogg 文件有效，第二次播放 LineUnavailableException

Question

我正在尝试在 Java 中循环播放 ogg 音频文件。我正在使用VorbisSPI。

我成功地播放了一次文件。当我尝试再次播放该文件或播放另一个文件时，我得到一个

LineUnavailableException: line with format PCM_SIGNED 44100.0 Hz, 16 bit, stereo, 4 bytes/frame, little-endian not supported.

我不知道我做错了什么。

方法如下。

public static void testLine(File file) {
    try (AudioInputStream in = AudioSystem.getAudioInputStream(file)) {
        AudioFormat inFormat = in.getFormat();
        AudioFormat outFormat = new AudioFormat(PCM_SIGNED, inFormat.getSampleRate(), 
                16, inFormat.getChannels(), inFormat.getChannels() * 2, inFormat.getSampleRate(), false);
        Info info = new Info(SourceDataLine.class, outFormat);

        SourceDataLine line = (SourceDataLine) AudioSystem.getLine(info);
        if (line != null) {
            line.open(outFormat);

            FloatControl volume = (FloatControl) line.getControl(FloatControl.Type.MASTER_GAIN); 
            volume.setValue((float) ambiance.audio.Track.DEFAULT_VOLUME);

            // stream
            line.start();

            byte[] buffer = new byte[65536];        // is this magical?     // yes: the highest number which can be represented by an unsigned 16-bit binary number
            AudioInputStream stream = AudioSystem.getAudioInputStream(outFormat,in);
            for (int n = 0; n != -1; n = stream.read(buffer, 0, buffer.length)) {
                line.write(buffer, 0, n);
            }

            line.drain();
            line.stop();
            in.close();

            retVal = true;
        }
    } catch (UnsupportedAudioFileException|LineUnavailableException|IOException e) {
        JOptionPane.showMessageDialog(null, e.getMessage(), 
                e.getClass().toString(), JOptionPane.ERROR_MESSAGE);
    } 
}

Answer 1

完成后，您需要在line 上致电close()。