为什么我的麦克风不能正常工作？

Question

我想制作一个写入文件的麦克风，但该文件为空。我不明白为什么。

public void recordSound () throws IOException, LineUnavailableException, InterruptedException {
  // Assume that the TargetDataLine, line, has already
  // been obtained and opened.
  AudioFormat format = new AudioFormat(44100, 16, 2, true, true);
  TargetDataLine line = AudioSystem.getTargetDataLine(format);
  ByteArrayOutputStream out  = new ByteArrayOutputStream();
  int numBytesRead;
  byte[] data = new byte[line.getBufferSize() / 5];

  // Begin audio capture.
  line.start();
  // Read the next chunk of data from the TargetDataLine.
  numBytesRead =  line.read(data, 0, data.length);
  // Save this chunk of data.
  out.write(data, 0, numBytesRead);
  out.writeTo(new FileOutputStream("./audio.wav"));
  Thread.sleep(1000);
  line.stop();
  line.close(); }

Answer 1

你必须先打开这条线

line.open(line.getFormat());
line.start();