Java MP3播放器-播放、暂停和查找与jLayer不一致

Question

null

关键是我使用jLayer的实现不起作用：当我执行play-pause-resume时，音频被暂停，但随后从文件中的随机点恢复。

public class MPlayer{
    AdvancedPlayer player;
    private static int pausedOnFrame =0;
    private byte[] decrypted = null;
    private long audioLength;
    private AudioInputStream stream;
    private InputStream bytesToStream(byte[] in) {
        InputStream is = new ByteArrayInputStream(in);
        return is;
    }

    public MPlayer(String fname) {
        /* here file is encrypted to variable byte[] decrypted and then: */
        InputStream is = bytesToStream(decrypted);
        stream = AudioSystem.getAudioInputStream(is);
        audioLength = stream.getFrameLength();

        player = new AdvancedPlayer(stream);
        player.setPlayBackListener(new PlaybackListener() {
            @Override
            public void playbackFinished(PlaybackEvent event) {
                System.err.println(event.getFrame());
                pausedOnFrame = event.getFrame();
            }

        }
    }

    public void play() throws Exception {
        Thread th = new Thread() {
            public void run() {
                player.play(MPlayer.pausedOnFrame, Integer.MAX_VALUE);
            }
        };
        th.start();
    }

    public void fastforward() {
        pausemusic();
        long nextFrame = (long) (pausedOnFrame+0.02*audioLength);
        if (nextFrame < audioLength)
            play();
    }
    public void rewind() {
        pausemusic();
        long nextFrame = (long) (pausedOnFrame-0.02*audioLength);
        if (nextFrame > 0)
            play();
        }
    }

    public void pausemusic() throws LineUnavailableException {
        player.stop();
    }
    public void stopmusic() throws LineUnavailableException {
        player.stop();
        pausedOnFrame = 0;
    }
}

我该怎么修好它？

Answer 1

您似乎必须在pause方法上调用stop，而不给它一个位置。

    public void pausemusic() throws LineUnavailableException {
    player.stop();
}
public void stopmusic() throws LineUnavailableException {
    player.stop();
    pausedOnFrame = 0;
}

我不熟悉您的代码是如何工作的，但是如果'stopmusic'方法通过'paused onframe=0'将歌曲重置为0，那么为什么不在播放过程中保留一个计数器，以便创建一个知道在哪里定位的pause方法呢？

简而言之，你为什么不追踪这首歌在哪里？