Java AudioSystem 和 TargetDataLine

Question

我正在尝试从我的 PC 的线路输入中捕获音频，为此我正在使用 AudioSystem类(class)。静态 AudioSystem.write 方法有两种选择之一:写入文件或写入流。我可以让它很好地写入文件，但每当我尝试写入流时，我都会抛出 java.io.IOException(未指定流长度)。至于我的缓冲区，我使用的是 ByteArrayOutputStream。是否有另一种流我应该在其他地方使用或弄乱？

另外在相关主题中，可以通过调用 TargetDataLine 直接对 ( read ) 中的音频线进行采样.这是进行音频捕获还是使用 AudioSystem 的首选方式？

更新请求的源代码:

final private TargetDataLine line;
final private AudioFormat format;
final private AudioFileFormat.Type fileType;
final private AudioInputStream audioInputStream;
final private ByteArrayOutputStream bos;

// Constructor, etc.

public void run()
{
    System.out.println("AudioWorker Started");
    try
    {
        line.open(format);
        line.start();

        // This commented part is regarding the second part
        // of my question
        // byte[] buff = new byte[512];
        // int bytes = line.read(buff, 0, buff.length);

        AudioSystem.write(audioInputStream, fileType, bos);

    }
    catch ( Exception e )
    {
        e.printStackTrace();
    }

    System.out.println("AudioWorker Finished");
}


// Stack trace in console
AudioWorker Started
java.io.IOException: stream length not specified
    at com.sun.media.sound.WaveFileWriter.write(Unknown Source)
    at javax.sound.sampled.AudioSystem.write(Unknown Source)
    at AudioWorker.run(AudioWorker.java:41)
AudioWorker Finished

Answer 1

来自 AudioSystem.write JavaDoc:

Writes a stream of bytes representing an audio file of the specified file type to the output stream provided. Some file types require that the length be written into the file header; such files cannot be written from start to finish unless the length is known in advance. An attempt to write a file of such a type will fail with an IOException if the length in the audio file type is AudioSystem.NOT_SPECIFIED.