Question

我正在尝试使用sun.audio.Audiplayer和sun.audio.AudioStream的功能设计一个类。我希望能够使用声音文件的文件路径作为参数来实例化对象，然后只需调用一种方法来播放指定的文件。我拥有的代码可以运行，但是不能多次播放任何文件。我该如何解决？

public class AudioFile {
    // attributes
    private AudioStream audioStream;

    // constructors
    public AudioFile(String filePath) throws FileNotFoundException, IOException { // improper exception-handling, to be fixed

    // declare the file path to an FileInputStream
    InputStream inputStream = new FileInputStream(filePath);

    // create an AudioStream from the InputStream
    AudioStream audioStream = new AudioStream(inputStream);
    this.audioStream = audioStream;
    }

// methods
public void playFile() {
    // start playing sound file
    AudioPlayer.player.start(audioStream);
}

public class Main {
    public static void main(String[] args) throws IOException, InterruptedException { // improper exception-handling, to be fixed

        // instantiate new AudioFile objects with path to sound files
        AudioFile correctSound = new AudioFile("sfx/correct.wav");
        AudioFile boingSound = new AudioFile("sfx/boing.wav");

        Scanner scanner = new Scanner(System.in);
        while(true) {
            int input = scanner.nextInt();

            switch (input) {
                case 1:
                    correctSound.playFile();
                    System.out.println("Correct!");
                    break;
                case 2:
                    boingSound.playFile();
                    System.out.println("Boing!");
                    break;
            }
        }
    }
}

Answer 1

流通常只能读取一次。因此，在AudioStream使用流之后，就不能再次使用它。

一个简单的实现可能如下：每次播放音频时创建和打开流。

public class AudioFile {
    // attributes
    private String filePath;

    // constructors
    public AudioFile(String filePath) { // improper exception-handling, to be fixed
        // declare the file path to an FileInputStream
        this.filePath=filePath;
    }

    // methods
    public void playFile() throws FileNotFoundException, IOException  {
        // Put open of FileInputStream in a try to be sure to close it
        try(InputStream inputStream = new FileInputStream(filePath)){
            // create an AudioStream from the InputStream
            AudioStream audioStream = new AudioStream(inputStream);
            this.audioStream = audioStream;

            // start playing sound file
            AudioPlayer.player.start(audioStream);
        }
    }
}

如果文件较小，则可以使用字节缓冲区将音频保留在内存中，但是如果文件较小，则将其存储在内存中的收益也很小。

sun.audio.AudioPlayer，AudioStream不会多次播放相同的声音文件

1 个答案: