我如何等待java声音片段完成播放？ [英] how can I wait for a java sound clip to finish playing back?

问题描述

我使用以下代码使用java声音API播放声音文件。

I am using the following code to play a sound file using the java sound API.

    Clip clip = AudioSystem.getClip();
    AudioInputStream inputStream = AudioSystem.getAudioInputStream(stream);
    clip.open(inputStream);
    clip.start();

对Clip.start（）方法的方法调用立即返回，系统播放声音文件在后台线程中。我希望我的方法暂停，直到播放完成。

The method call to the Clip.start() method returns immediately, and the system playbacks the sound file in a background thread. I want my method to pause until the playback has completed.

有什么好办法吗？

编辑：对于对我的最终解决方案感兴趣的每个人，根据Uri的答案，我使用下面的代码：

For everyone interested in my final solution, based on the answer from Uri, I used the code below:

private final BlockingQueue<URL> queue = new ArrayBlockingQueue<URL>(1);

public void playSoundStream(InputStream stream) {
    Clip clip = AudioSystem.getClip();
    AudioInputStream inputStream = AudioSystem.getAudioInputStream(stream);
    clip.open(inputStream);
    clip.start();
    LineListener listener = new LineListener() {
        public void update(LineEvent event) {
                if (event.getType() != Type.STOP) {
                    return;
                }

                try {
                    queue.take();
                } catch (InterruptedException e) {
                    //ignore this
                }
        }
    };
clip.addLineListener(listener );
}

推荐答案

声音片段是一种类型或Line并因此支持Line侦听器。

A sound clip is a type or Line and therefore supports Line listeners.

如果使用addLineListener，则应该在播放开始和停止时获取事件;如果你不在循环中，你应该在剪辑结束时停止。但是，与任何事件一样，在实际播放结束和停止之前可能存在延迟。

If you use addLineListener, you should get events when play starts and stops; if you're not in a loop, you should get a stop when the clip ends. However, as with any events, there might be a lag before the actual end of playback and the stopping.

使方法等待稍微复杂一些。您可以忙着等待它（不是一个好主意）或使用其他同步机制。我认为有一种模式（不确定）等待一个长期操作来抛出一个完成事件，但这是一个普遍的问题，你可能想要单独发布到SO。

Making the method wait is slightly trickier. You can either busy-wait on it (not a good idea) or use other synchronization mechanisms. I think there is a pattern (not sure about it) for waiting on a long operation to throw a completion event, but that's a general question you may want to post separately to SO.

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