Adam Tang Adam Tang - 14 days ago 10
iOS Question

ios avplayer trigger streaming is out of buffer

I wanna to reconnect to the server when the streaming is out of buffer.

How can I trigger the

AVPlayer
or
AVPlayerItem
is out of buffer?

I know there are
playbackLikelyToKeepUp
,
playbackBufferEmpty
and
playbackBufferFull
methods to check the buffer status but it not a callback.

Any callback functions or any observer should I add?

Answer

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];

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

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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