AVQueuePlayer / AVPlayer加载通知？

1 回答

• 26

  你必须使用KVO来完成这项工作 .

  对于要添加到队列的每个项目，您可以设置如下观察者：

  item_ = [[AVPlayerItem playerItemWithURL:[NSURL URLWithString:@"http://somefunkyurl"]] retain];
  [item_ addObserver:self forKeyPath:@"status" options:0 context:nil];
  [item_ addObserver:self forKeyPath:@"playbackBufferEmpty" options:0 context:nil];
  

  现在，您可以在observer方法中评估该项目的状态;

  - (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
  {
      if ([object isKindOfClass:[AVPlayerItem class]])
      {
          AVPlayerItem *item = (AVPlayerItem *)object;
          //playerItem status value changed?
          if ([keyPath isEqualToString:@"status"])
          {   //yes->check it...
              switch(item.status)
              {
                  case AVPlayerItemStatusFailed:
                      NSLog(@"player item status failed");
                  break;
                  case AVPlayerItemStatusReadyToPlay:
                      NSLog(@"player item status is ready to play");
                  break;
                  case AVPlayerItemStatusUnknown:
                      NSLog(@"player item status is unknown");
                  break;
              }
          }
          else if ([keyPath isEqualToString:@"playbackBufferEmpty"])
          {
              if (item.playbackBufferEmpty)
              {
                  NSLog(@"player item playback buffer is empty");
              }
          }
      }
  }
  

  回复于 2024-05-03T21:31:03+08:00