java中的声音 - 播放声音时游戏冻结

Posted 2023-02-25

【中文标题】java中的声音 - 播放声音时游戏冻结

【英文标题】：Sound in java - Game freezes when playing sound

【发布时间】：2013-03-19 18:22:34

【问题描述】：

每当我在游戏中播放声音时，线程都会冻结，然后在声音播放完毕后继续。声音引擎的代码：

package com.kgt.platformer;

import java.io.File;
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.SourceDataLine;

public class Sound 
    private final static int BUFFER_SIZE = 12800000;
    private static File soundFile;
    private static AudioInputStream audioStream;
    private static AudioFormat audioFormat;
    private static  SourceDataLine sourceLine;

    /**
     * 
     * @param filename the name of the file that is going to be played
     *
     */
    public static void playSound(String filename)

        String strFilename = filename;

        try 
            soundFile = new File(strFilename);
         catch (Exception e) 
            e.printStackTrace();
            System.exit(1);
        

        try 
            audioStream = AudioSystem.getAudioInputStream(soundFile);
         catch (Exception e)
            e.printStackTrace();
           System.exit(1);
        

        audioFormat = audioStream.getFormat();

        DataLine.Info info = new DataLine.Info(SourceDataLine.class, audioFormat);
        try 
            sourceLine = (SourceDataLine) AudioSystem.getLine(info);
            sourceLine.open(audioFormat);
         catch (LineUnavailableException e) 
            e.printStackTrace();
            System.exit(1);
         catch (Exception e) 
            e.printStackTrace();
            System.exit(1);
        


        sourceLine.start();

        int nBytesRead = 0;
        byte[] abData = new byte[BUFFER_SIZE];
        while (nBytesRead != -1) 
            try 
                nBytesRead = audioStream.read(abData, 0, abData.length);
             catch (IOException e) 
                e.printStackTrace();
            
            if (nBytesRead >= 0) 
                @SuppressWarnings("unused")
                int nBytesWritten = sourceLine.write(abData, 0, nBytesRead);
            
        

        sourceLine.drain();
        sourceLine.close();
    

最终发生的事情是我开始游戏，它播放声音，游戏冻结然后继续。

【问题讨论】：

如果你不想让游戏被屏蔽，那你为什么打电话给the drain method？

【参考方案1】：

您可以启动一个线程来处理流的读取和写入。看看这里： How can I play sound in Java?

示例代码：

new Thread(new Runnable() 
  public void run() 
    Sound.playSound("Test.wav");
  
).start();

【参考方案2】：

基于Clip 的Java Sound 使用它自己的（守护进程）Thread。请参阅此示例，该示例将循环播放 2 个剪辑（尽管被警告，请调低音量）。另请注意，第二个剪辑需要一些时间才能加载。等到看到JOptionPane - 然后两个剪辑都应该循环播放。

import java.net.URL;
import javax.swing.*;
import javax.sound.sampled.*;

public class LoopSounds 

    public static void main(String[] args) throws Exception 
        URL url1 = new URL(
            "http://pscode.org/media/leftright.wav");
        URL url2 = new URL("http://pscode.org/media/100_2817-linear.wav");
        Clip clip1 = AudioSystem.getClip();
        Clip clip2 = AudioSystem.getClip();
        // getAudioInputStream() also accepts a File or InputStream
        AudioInputStream ais1 = AudioSystem.
            getAudioInputStream( url1 );
        clip1.open(ais1);
        clip1.loop(Clip.LOOP_CONTINUOUSLY);

        AudioInputStream ais2 = AudioSystem.
            getAudioInputStream( url2 );
        clip2.open(ais2);
        clip2.loop(Clip.LOOP_CONTINUOUSLY);
        SwingUtilities.invokeLater(new Runnable() 
            public void run() 
                // A GUI element to prevent the Clip's daemon Thread
                // from terminating at the end of the main()
                JOptionPane.showMessageDialog(null, "Close to exit!");
            
        );