java - 如何在 javax.sound.sampled.Line 上播放/录制声音

Question

我有一个数组，其中填充了所有当前连接的麦克风的 javax.sound.sampled.Line.Info 对象

Info[] sourceInfos = AudioSystem.getSourceLineInfo(Port.Info.MICROPHONE);

使用它们我可以获得所有麦克风的线路

for (Info sourceInfo : sourceInfos) {
    Line sourceLine = AudioSystem.getLine(sourceInfo);
    // record sound from those lines
}

演讲者也是如此

Info[] sourceInfos = AudioSystem.getSourceLineInfo(Port.Info.SPEAKER);
for (Info sourceInfo : sourceInfos) {
    Line sourceLine = AudioSystem.getLine(sourceInfo);
    // play sound on those lines
}

现在我只需要弄清楚如何在 Line 上播放声音以及如何从 Line 录制声音。这是我卡住的地方，找不到解决方案。

所以只是说一下，问题是，我如何读取/写入一行？
谢谢
巴施迪

Answer 1

您可以尝试此示例来捕获和播放音频。它基于 Java Sound API 文档中提供的示例。

以下是您可以引用的资源:

1. Accessing Audio System Resources
2. Capturing audio .

3. Playing audio .

   import java.io.ByteArrayOutputStream;
   import java.io.IOException;
   import javax.sound.sampled.AudioFormat;
   import javax.sound.sampled.AudioInputStream;
   import javax.sound.sampled.AudioSystem;
   import javax.sound.sampled.DataLine;
   import javax.sound.sampled.LineUnavailableException;
   import javax.sound.sampled.Mixer;
   import javax.sound.sampled.SourceDataLine;
   import javax.sound.sampled.TargetDataLine;
   
   public class Audio {
   
   boolean stopCapture = false;
   ByteArrayOutputStream byteArrayOutputStream;
   AudioFormat audioFormat;
   TargetDataLine targetDataLine;
   AudioInputStream audioInputStream;
   SourceDataLine sourceDataLine;
   byte tempBuffer[] = new byte[500];
   
   public static void main(String[] args) {
       Audio audio = new Audio();
       audio.captureAudio();
   
   }
   
   private AudioFormat getAudioFormat() {
       float sampleRate = 8000.0F;
       int sampleSizeInBits = 16;
       int channels = 1;
       boolean signed = true;
       boolean bigEndian = true;
       return new AudioFormat(sampleRate, sampleSizeInBits, channels, signed, bigEndian);
   }
   
   private void captureAudio() {
       try {
   
           /* ~~~~~ UPDATE THIS PART OF CODE ~~~~~*/
   
           Mixer.Info[] mixerInfo = AudioSystem.getMixerInfo();    //get available mixers
           System.out.println("Available mixers:");
           for (int cnt = 0; cnt < mixerInfo.length; cnt++) {
               System.out.println(mixerInfo[cnt].getName());
           }
           audioFormat = getAudioFormat();     //get the audio format
   
           DataLine.Info dataLineInfo = new DataLine.Info(TargetDataLine.class, audioFormat);
   
           Mixer mixer = AudioSystem.getMixer(mixerInfo[3]);   //getting the mixer for capture device
   
           /* ~~~~~ UPDATE THIS PART OF CODE ~~~~~*/ 
   
           targetDataLine = (TargetDataLine) mixer.getLine(dataLineInfo);
           targetDataLine.open(audioFormat);
           targetDataLine.start();
   
           DataLine.Info dataLineInfo1 = new DataLine.Info(SourceDataLine.class, audioFormat);
           sourceDataLine = (SourceDataLine) AudioSystem.getLine(dataLineInfo1);
           sourceDataLine.open(audioFormat);
           sourceDataLine.start();
   
           Thread captureAndPlayThread = new captureAndPlayThread();   //thread to capture and play audio
           captureAndPlayThread.start();
   
       } catch (LineUnavailableException e) {
           System.out.println(e);
           System.exit(0);
       }
   }
   
   class captureAndPlayThread extends Thread {
   
       @Override
       public void run() {
           byteArrayOutputStream = new ByteArrayOutputStream();
           stopCapture = false;
           try {
               int readCount;
               while (!stopCapture) {
                   readCount = targetDataLine.read(tempBuffer, 0, tempBuffer.length);  //capture sound into tempBuffer
                   if (readCount > 0) {
                       byteArrayOutputStream.write(tempBuffer, 0, readCount);
                       sourceDataLine.write(tempBuffer, 0, 500);   //playing audio available in tempBuffer
                   }
               }
               byteArrayOutputStream.close();
           } catch (IOException e) {
               System.out.println(e);
               System.exit(0);
           }
       }
   }
   
   }
   

   `

编辑:请使用此代码更新之前的代码。以下代码片段仅在支持麦克风时选择混音器，即 TargetDataLine。同样，您可以为扬声器做，即 SourceDataLine。

        Mixer.Info[] mixerInfo = AudioSystem.getMixerInfo();    //get available mixers
        System.out.println("Available mixers:");
        Mixer mixer = null;
        for (int cnt = 0; cnt < mixerInfo.length; cnt++) {
            System.out.println(cnt + " " + mixerInfo[cnt].getName());
            mixer = AudioSystem.getMixer(mixerInfo[cnt]);

            Line.Info[] lineInfos = mixer.getTargetLineInfo();
            if (lineInfos.length >= 1 && lineInfos[0].getLineClass().equals(TargetDataLine.class)) {
                System.out.println(cnt + " Mic is supported!");
                break;
            }
        }

        audioFormat = getAudioFormat();     //get the audio format
        DataLine.Info dataLineInfo = new DataLine.Info(TargetDataLine.class, audioFormat);