0

我一直在努力解决这个问题，我一直在使用的计算器中有这个方法：

public void error_sound() throws UnsupportedAudioFileException, IOException, LineUnavailableException {
    AudioInputStream AIS = AudioSystem.getAudioInputStream(calculator.class.getResourceAsStream("/resources/Error.wav"));
    AudioFormat format = AIS.getFormat();
    SourceDataLine playbackLine = AudioSystem.getSourceDataLine(format);
    playbackLine.open(format);
    playbackLine.start();
    int bytesRead = 0;
    byte[] buffer = new byte[128000];
    while (bytesRead != -1) {
        bytesRead = AIS.read(buffer, 0, buffer.length);
        if (bytesRead >= 0)
            playbackLine.write(buffer, 0, bytesRead);
        }
    playbackLine.drain();
    playbackLine.close();
}

此代码适用于 JRE6，但不适用于 JRE7。如果有人能提出一种方法来使上述 JRE7 工作，我将永远感激不尽？

Sun 似乎在 JRE 1.7 中放弃了“Java 声音音频引擎”，而这是我唯一可以归结为的原因？

4

1 回答 1

2

"It appears that Sun dropped the "Java Sound Audio Engine" in JRE 1.7 and this is the only thing I can put it down to?"

Nope, that would have been noticed by a lot of people, including me. Your comments indicate there is a problem seeking in the resource input stream. That can either be caused by different audio systems or different implementations of getAudioStream().

You could just try wrapping the resource stream into a BufferedInputStream:

InputStream raw = calculator.class.getResourceAsStream("/resources/Error.wav");
InputStream bis = new BufferedInputStream(raw, 20000);
AudioInputStream ais = AudioSystem.getAudioInputStream(bis);

(Thats based on the idea thet BufferedInputStream supports mark / reset)

You should really add some proper error handling to the code (check if the resource is there etc. and proper error logging/reporting). It really helps in the long run if problems are reported clearly.

EDIT: Re-reading you problem description, its clear you are running the code from eclipse, and on the other computer you run from a jar-file. The problem is your code doesn't cope with the latter. Wrapping it into a BufferedInputStream should fix that (you may need to increase the buffer size though).

Edit2: Try this for repeating sound:

public void error_sound() throws UnsupportedAudioFileException, IOException, LineUnavailableException {
    AudioInputStream AIS = ...
    AudioFormat format = ...
    SourceDataLine playbackLine = ...
    playbackLine.open(format);
    playbackLine.start();

    int repeats = 5;
    while (true) {
       // playloop
       int bytesRead = 0;
       byte[] buffer = new byte[128000];
       while (bytesRead != -1) {
           bytesRead = AIS.read(buffer, 0, buffer.length);
           if (bytesRead >= 0)
                playbackLine.write(buffer, 0, bytesRead);
       }
       --repeats;
       if (repeats <= 0) {
           // done, stop playing
           break;
       } else {
           // repeat one more time, reset audio stream
           AIS = ...
       }
   }
   playbackLine.drain();
   playbackLine.close();
}

The only complicated thing is that you need the audio stream to get the format and that you also need to create it anew in every loop iteration to read it from the beginning. Everything else stays the same.

于 2013-10-24T15:49:17.133 回答