ios avplayer 触发器流超出缓冲区 [英] ios avplayer trigger streaming is out of buffer

问题描述

我想在流缓冲区为空时重新连接到服务器.

I want to reconnect to the server when the streaming buffer is empty.

如何在 AVPlayer 或 AVPlayerItem 缓冲区为空时触发方法?

How can I trigger a method when the AVPlayer or AVPlayerItem buffer is empty?

我知道有 playbackLikelyToKeepUp、playbackBufferEmpty 和 playbackBufferFull 方法来检查缓冲区状态，但这些不是回调.

I know there are playbackLikelyToKeepUp, playbackBufferEmpty and playbackBufferFull methods to check the buffer status, but those are not callbacks.

是否有任何回调函数，或者我应该添加任何观察者?

Are there any callback functions, or any observers I should add?

推荐答案

您可以为这些键添加观察者:

you can add observer for those keys:

[playerItem addObserver:self forKeyPath:@"playbackBufferEmpty" options:NSKeyValueObservingOptionNew context:nil];
[playerItem addObserver:self forKeyPath:@"playbackLikelyToKeepUp" options:NSKeyValueObservingOptionNew context:nil];

第一个会在您的缓冲区为空时警告您，第二个会在您的缓冲区可以再次使用时发出警告.

The first one will warn you when your buffer is empty and the second when your buffer is good to go again.

然后要处理密钥更改，您可以使用以下代码:

Then to handle the key change you can use this code:

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object
                        change:(NSDictionary *)change context:(void *)context {
    if (!player)
    {
        return;
    }

    else if (object == playerItem && [keyPath isEqualToString:@"playbackBufferEmpty"])
    {
        if (playerItem.playbackBufferEmpty) {
            //Your code here
        }
    }

    else if (object == playerItem && [keyPath isEqualToString:@"playbackLikelyToKeepUp"])
    {
        if (playerItem.playbackLikelyToKeepUp)
        {
            //Your code here
        }
    }
}

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