我正在嘗試在java中實現mp3播放器，它將從字節數組中播放音頻 .

該類應該像這樣工作：

加載用aes加密的mp3文件

將其解密為bytes / inputstream數組

播放變量中的音樂

讓用戶暫停/停止/回放它

關鍵是我使用jLayer的實現不起作用：當我播放 - 暫停 - 恢復時，音頻暫停但隨后從文件中的隨機點恢復 .

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;

}

}

我該如何解決？

總結

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