在AVPlayer中播放与坏互联网的流 [英] Playing stream with bad internet in AVPlayer

问题描述

当AVPlayer播放来自网络流的资源时，它会在到达下载内容的末尾时暂停。

When AVPlayer plays an asset that comes from network stream, it pauses when reaches the end of downloaded content.

所以，我的问题是，如何知道它因网络不良而停止了？如何在下载之后播放它，比方说，接下来10秒的资产？

So, my question is, how to know, that it stopped because of bad network? And how to play it after it downloads, let’s say, next 10 seconds of asset?

推荐答案

你可以添加一个观察者到什么时候AVPlayer获取空缓冲区：

You can add an observer to when the AVPlayer gets empty buffer:

[[self.tracksPlayer currentItem] addObserver:self 
                                  forKeyPath:@"playbackBufferEmpty" 
                                     options:NSKeyValueObservingOptionNew
                                     context:nil];

还有一个观察者，这样你就可以知道AVPlayer何时缓冲得足以跟上：

And an observer so you can know when the AVPlayer buffered enough to keep up:

[[self.tracksPlayer currentItem] addObserver:self 
                                  forKeyPath:@"playbackLikelyToKeepUp" 
                                     options:NSKeyValueObservingOptionNew 
                                     context:nil];

然后在你的KVO回调中检查一下：

Then just check for that in your KVO callback:

- (void)observeValueForKeyPath:(NSString *)keyPath 
                      ofObject:(id)object 
                        change:(NSDictionary *)change 
                       context:(void *)context {

   if (object == [self.tracksPlayer currentItem] && 
      [keyPath isEqualToString:@"playbackBufferEmpty"]) {

      if ([self.tracksPlayer currentItem].playbackBufferEmpty) {
          NSLog(@"Buffer Empty"); 
      }
   } else if (object == [self.tracksPlayer currentItem] && 
             [keyPath isEqualToString:@"playbackLikelyToKeepUp"]) {

      if ([self.tracksPlayer currentItem].playbackLikelyToKeepUp) {
          NSLog(@"LikelyToKeepUp");
      }
   }
}

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