java - 如何在Java中播放长声音文件？没有语法错误但没有声音

Question

所以我对 OOP 总体来说是新手，尤其是 Swing 类。我的问题是，虽然我的代码编译没有错误，但当我播放一些音乐的长声音文件时没有声音。有没有办法解决这个问题，因为我使用的是一个波形文件，该文件存储在我能想到的构成代码的每个可能的文件夹中。此外，自从我阅读了一些有关小端字节序的帖子以来，是否需要一种特定类型的波形格式(我不知道这意味着什么)...

代码转到 try block ，但随后“跳过”接下来的四行，就好像它们根本不存在一样。

import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.Clip;
import javax.swing.JOptionPane;

public class Sound {
    Clip clip = null;

    public Sound(String file) {

        try {
            AudioInputStream audioInputStream = AudioSystem.getAudioInputStream(Sound.class.getResourceAsStream(file));
            clip = AudioSystem.getClip();
            clip.open(audioInputStream);
            clip.start();
            System.out.println("Done!");
        } catch (Exception err) {
            err.printStackTrace();
        }
    }
}

如果可能的话，用外行的话来说。谢谢。 :)

注意:我想强调这样一个事实:我不希望得到实现 sun.audio 包的答案，因为它对于 Java 来说显然“过时”了。

编辑:我发现了一个使用线程循环的尴尬解决方案:只要音乐正在播放，线程就会 hibernate 15 秒。

Answer 1

这可以使用 java 渲染单声道(单 channel )wav 音频

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.Clip;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.UnsupportedAudioFileException;

public class PlayAudio {
    private static boolean tryToInterruptSound = false;
    private static long mainTimeOut = 3000;
    private static long startTime = System.currentTimeMillis();

    public static synchronized Thread PlayAudio(final File file) {

        Thread soundThread = new Thread() {
            @Override
            public void run() {
                try{
                    Clip clip = null;
                    AudioInputStream inputStream = null;
                    clip = AudioSystem.getClip();
                    inputStream = AudioSystem.getAudioInputStream(file);
                    AudioFormat format = inputStream.getFormat();
                    long audioFileLength = file.length();
                    int frameSize = format.getFrameSize();
                    float frameRate = format.getFrameRate();
                    long durationInMiliSeconds = 
                            (long) (((float)audioFileLength / (frameSize * frameRate)) * 1000);

                    clip.open(inputStream);
                    clip.start();
                    System.out.println("" + (System.currentTimeMillis() - startTime) + ": sound started playing!");
                    Thread.sleep(durationInMiliSeconds);
                    while (true) {
                        if (!clip.isActive()) {
                            System.out.println("" + (System.currentTimeMillis() - startTime) + ": sound got to it's end!");
                            break;
                        }
                        long fPos = (long)(clip.getMicrosecondPosition() / 1000);
                        long left = durationInMiliSeconds - fPos;
                        System.out.println("" + (System.currentTimeMillis() - startTime) + ": time left: " + left);
                        if (left > 0) Thread.sleep(left);
                    }
                    clip.stop();  
                    System.out.println("" + (System.currentTimeMillis() - startTime) + ": sound stoped");
                    clip.close();
                    inputStream.close();
                } catch (LineUnavailableException e) {
                    e.printStackTrace();
                } catch (UnsupportedAudioFileException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                } catch (InterruptedException e) {
                    System.out.println("" + (System.currentTimeMillis() - startTime) + ": sound interrupted while playing.");
                }
            }
        };
        soundThread.setDaemon(true);
        soundThread.start();
        return soundThread;
    }

    public static void main(String[] args) {

        Thread soundThread = PlayAudio(new File("/home/scott/Dropbox/Documents/data/audio/Elephant_sounds_mono_rgUFu_hVhlk.wav"));
        System.out.println("" + (System.currentTimeMillis() - startTime) + ": playSound returned, keep running the code");
        try {   
            Thread.sleep(mainTimeOut );
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        if (tryToInterruptSound) {
            try {   
                soundThread.interrupt();
                Thread.sleep(1); 
                // Sleep in order to let the interruption handling end before
                // exiting the program (else the interruption could be handled
                // after the main thread ends!).
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        System.out.println("" + (System.currentTimeMillis() - startTime) + ": End of main thread; exiting program " + 
                (soundThread.isAlive() ? "killing the sound deamon thread" : ""));
    }
}

现在输入的 wav 文件名是硬编码的......享受