恢复AVPlayer流播放的最后一个样本 [英] Resume AVPlayer stream playback last sample

问题描述

我正在尝试使用本机播放器(AVPlayer)在iOS上重现实时流.但是，我无法恢复播放.当我停止播放并在几秒钟后恢复播放时，播放将从暂停的那一刻开始，而不是重现当前(最后)的实时流样本.

I am trying to use the native player (AVPlayer) to reproduce a live stream on iOS. However, I have trouble resuming the playback. When I stop the playback and resume it after few seconds, the playback starts from the moment I paused instead of reproducing the current (last) sample of the live stream.

是否有一种获取最后一个样本的方法，或者将AVPlayer配置为在点按播放按钮"时从最后一个样本重现?

Is there a way to get the last sample, o configure AVPlayer to reproduce from last sample when tapping on Play Button?

推荐答案

我的解决方案基于拒绝用户保持播放器暂停播放.也就是说，每次重新开始播放时都会破坏播放器.每次创建一个新实例时，都打算恢复播放.

My solution is based on denying user to keep the player paused. This is, destroying the player each time playback is resumed. And creating a new instance each time, playback is intended to be resumed.

根据Apple的建议，知道AVPlayer是否已停止的唯一解决方案是添加KVO.这是:

According to Apple recommendation, the only solution to know if the AVPlayer was stopped is to add KVO. This is:

- (void)setupPlayer {
    AVPlayer *player = [AVPlayer playerWithURL:streamURL];
    AVPlayerViewController *playerViewController = [[AVPlayerViewController alloc] init];
    playerViewController.player = player;
    self.playerViewController = playerViewController;

    [self configureConstraintsForView:self.playerViewController.view]; //Add Player to View

    [self setupObservers];

    [player play];
}

- (void)setupObservers {
    [self.playerViewController.player addObserver:self
                                       forKeyPath:@"rate"
                                          options:NSKeyValueObservingOptionNew | NSKeyValueObservingOptionOld
                                          context:NULL];

}

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSKeyValueChangeKey, id> *)change context:(void *)context
    if ([keyPath isEqualToString:@"rate"] && self.playerViewController.player.rate == CGPointZero.x) {
        [self.playerViewController.view removeFromSuperview];
        [self.playerViewController.player removeObserver:self forKeyPath:@"rate"];
        [self.playerViewController.player pause];
        self.playerViewController = nil;
    }
}

然后，当用户想要重新与播放器互动时，只需调用-(void)setupPlayer，该播放器将从上一个实时采样开始播放.

Then, when user wants to re-engage the player, just call -(void)setupPlayer which start the playback from the last live sample.

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