ExoPlayer和开始/暂停/seekTo命令 [英] ExoPlayer and start / pause / seekTo commands

问题描述

我正在尝试使用ExoPlayer，而不是MediaPlayer，我似乎无法弄清楚...

I am trying to use ExoPlayer, as opposed to MediaPlayer and I can't seem to figure it out...

MediaPlayer具有.start()/.pause()命令...我只能按seekTo(1287)并且它会自动开始播放...

MediaPlayer has .start() / .pause() commands... and I can just seekTo(1287) and it automatically starts playing...

如何使用ExoPlayer执行此操作?我尝试做seekTo(1287)，但是它在之后没有开始播放...之后，我还添加了.setPlayWhenReady(true)，仍然没有运气...

How do I do this with ExoPlayer? I have tried to do seekTo(1287) but it doesn't start playing after... I have also added .setPlayWhenReady(true) after that, and still no luck...

我能够.stop() ...但是在那之后我无法让它再次开始播放，除非再次我.prepare() ...但我认为我不必在每次暂停之间都这样做玩.

I am able to .stop()... but I can't get it to start playing again after that unless I .prepare() again... but I don't think I should have to do that between every pause and play.

我正在使用与MediaController相对的我自己的控件和方法，例如在ExoPlayer演示中...我不太清楚控件的实现方式...

I am using my own controls and methods opposed to MediaController like in the ExoPlayer Demo... I can't quite see how the controls are implemented...

有人建议吗?

好的，我想出了暂停并开始...

OK, I figured out pause and start...

.setPlayWhenReady(true) // start
.setPlayWhenReady(false) // pause

但是我仍然在跟踪方面遇到问题... .seekTo间歇性工作...有时可以工作...但是其他时候我遇到此错误:

But I'm still having problems with the tracking... .seekTo works intermittently... sometimes it works... but other times I get this error:

E/AudioTrack: AudioTrack::set : Exit

(而且它只能进入缓冲区状态...尚未完全进入就绪"状态...

(and it only gets to the buffer state... doesn't quite get to "ready"...

推荐答案

The official example of the PlayerControl in the ExoPlayer source code do exactly what you asked:

public class PlayerControl implements MediaPlayerControl {

  private final ExoPlayer exoPlayer;

  public PlayerControl(ExoPlayer exoPlayer) {
    this.exoPlayer = exoPlayer;
  }

  @Override
  public boolean canPause() {
    return true;
  }

  @Override
  public boolean canSeekBackward() {
    return true;
  }

  @Override
  public boolean canSeekForward() {
    return true;
  }

  @Override
  public int getAudioSessionId() {
    throw new UnsupportedOperationException();
  }

  @Override
  public int getBufferPercentage() {
    return exoPlayer.getBufferedPercentage();
  }

  @Override
  public int getCurrentPosition() {
    return exoPlayer.getDuration() == ExoPlayer.UNKNOWN_TIME ? 0
        : (int) exoPlayer.getCurrentPosition();
  }

  @Override
  public int getDuration() {
    return exoPlayer.getDuration() == ExoPlayer.UNKNOWN_TIME ? 0
        : (int) exoPlayer.getDuration();
  }

  @Override
  public boolean isPlaying() {
    return exoPlayer.getPlayWhenReady();
  }

  @Override
  public void start() {
    exoPlayer.setPlayWhenReady(true);
  }

  @Override
  public void pause() {
    exoPlayer.setPlayWhenReady(false);
  }

  @Override
  public void seekTo(int timeMillis) {
    long seekPosition = exoPlayer.getDuration() == ExoPlayer.UNKNOWN_TIME ? 0
        : Math.min(Math.max(0, timeMillis), getDuration());
    exoPlayer.seekTo(seekPosition);
  }

}

如果在搜索操作期间遇到奇怪的行为，则可能是由于您特定的流/文件类型所致.我建议您看看问题.

If you are experiencing strange behaviors during the seek operation, it may be due to you particular stream/file type. I can suggest you to take a look at the base implementation of the ExoPlayer and, eventually, report any issue on Github.

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