檢測靜音獲取用戶輸入通過語音

Question

我試圖檢測到沉默，以停止錄製麥克風的音頻。我目前的代碼是：

public byte[] getRecord() throws AudioException { 
    try { 
     // Reset the flag 
     stopped = false; 

     // Start a new thread to wait during listening 
     Thread stopper = new Thread(() -> { 
      try { 
       BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); 
       br.readLine(); 
       stopped = true; 
      } catch (IOException ex) { 
       ex.printStackTrace(); 
      } 
      stop(); 
     }); 

     // Start the thread that can stop the record 
     stopper.start(); 

     return record(); 
    } catch (Exception e) { 
     throw new LineUnavailableException("Unable to record your voice", e); 
    } 
} 

private byte[] record() throws LineUnavailableException { 
    AudioFormat format = AudioUtil.getAudioFormat(audioConf); 
    DataLine.Info info = new DataLine.Info(TargetDataLine.class, format); 

    // Checks if system supports the data line 
    if (!AudioSystem.isLineSupported(info)) { 
     return null; 
    } 

    microphone = (TargetDataLine) AudioSystem.getLine(info); 
    microphone.open(format); 
    microphone.start(); 

    System.out.println("Listening, tap enter to stop ..."); 

    ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(); 
    int numBytesRead; 
    byte[] data = new byte[microphone.getBufferSize()/5]; 

    // Begin audio capture. 
    microphone.start(); 

    // Here, stopped is a global boolean set by another thread. 
    while (!stopped) { 
     // Read the next chunk of data from the TargetDataLine. 
     numBytesRead = microphone.read(data, 0, data.length); 
     // Save this chunk of data. 
     byteArrayOutputStream.write(data, 0, numBytesRead); 
    } 

    return byteArrayOutputStream.toByteArray(); 
} 

目前我停止使用shell的錄音，但我想知道如何在while循環中停止它。

Answer 1

經過大量的嘗試現在它似乎工作。這是更新的代碼：

private byte[] record() throws LineUnavailableException { 
    AudioFormat format = AudioUtil.getAudioFormat(audioConf); 
    DataLine.Info info = new DataLine.Info(TargetDataLine.class, format); 

    // Checks if system supports the data line 
    if (!AudioSystem.isLineSupported(info)) { 
     return null; 
    } 

    microphone = (TargetDataLine) AudioSystem.getLine(info); 
    microphone.open(format); 
    microphone.start(); 

    System.out.println("Listening, tap enter to stop ..."); 

    ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(); 
    int numBytesRead; 
    byte[] data = new byte[microphone.getBufferSize()/5]; 
    short[] shorts = new short[data.length/2]; 
    long startSilence = 0; 
    boolean pause = false; 

    // Begin audio capture. 
    microphone.start(); 

    // Here, stopped is a global boolean set by another thread. 
    while (!stopped) { 
     // Read the next chunk of data from the TargetDataLine. 
     numBytesRead = microphone.read(data, 0, data.length); 
     ByteBuffer.wrap(data).order(ByteOrder.LITTLE_ENDIAN).asShortBuffer().get(shorts); 

     // Save this chunk of data. 
     byteArrayOutputStream.write(data, 0, numBytesRead); 

     double rms = 0; 
     for (int i = 0; i < shorts.length; i++) { 
      double normal = shorts[i]/32768f; 
      rms += normal * normal; 
     } 
     rms = Math.sqrt(rms/shorts.length); 
     System.out.println("Listening, rms is " + rms); 
     if (rms < 0.1) { 
      long now = System.currentTimeMillis(); 
      if (now - startSilence > 5000 && pause) 
       break; 
      if (!pause) { 
       startSilence = now; 
       System.out.println("Listening, new silence at " + startSilence); 
      } 
      pause = true; 
     } else 
      pause = false; 
    } 

    return byteArrayOutputStream.toByteArray(); 
}