将AVPlayer倒带5秒

Question

如何将流倒带5秒?

这是我的代码流在viewDidLoad:

AVPlayerItem* playerItem = [AVPlayerItem playerItemWithURL:[NSURL URLWithString:@"http://groove.wavestreamer.com:7321/listen.pls?sid=1"]];
[playerItem addObserver:self forKeyPath:@"timedMetadata" options:NSKeyValueObservingOptionNew context:nil];
music = [[AVPlayer playerWithPlayerItem:playerItem] retain];
[music play]; 
music = [[AVPlayer playerWithPlayerItem:playerItem] retain];
[music play];

Answer 1

在Swift 3+中

fileprivate let seekDuration: Float64 = 5

@IBAction func seekForward(_ sender: Any) {
    guard let duration  = player.currentItem?.duration else {
        return
    }
    let playerCurrentTime = CMTimeGetSeconds(player.currentTime())
    let newTime = playerCurrentTime + seekDuration
    if newTime < (CMTimeGetSeconds(duration) - seekDuration) {
        let time2: CMTime = CMTimeMake(Int64(newTime * 1000 as Float64), 1000)
        player.seek(to: time2, toleranceBefore: kCMTimeZero, toleranceAfter: kCMTimeZero)
    }
}
@IBAction func seekBackward(_ sender: Any) {
    let playerCurrentTime = CMTimeGetSeconds(player.currentTime())
    var newTime = playerCurrentTime - seekDuration
    if newTime < 0 {
        newTime = 0
    }
    let time2: CMTime = CMTimeMake(Int64(newTime * 1000 as Float64), 1000)
     player.seek(to: time2, toleranceBefore: kCMTimeZero, toleranceAfter: kCMTimeZero)

}

Answer 2

- (NSTimeInterval)currentPlaybackTime
{
    return CMTimeGetSeconds(self.playerView.player.currentItem.currentTime);
}

- (void)setCurrentPlaybackTime:(NSTimeInterval)time
{
    CMTime cmTime = CMTimeMakeWithSeconds(time, NSEC_PER_SEC);
    [self.playerView.player.currentItem seekToTime:cmTime];
}

- (IBAction)scanBackward
{
    self.currentPlaybackTime -= 5.0f;
}

Answer 3

在Swift 5:

 @IBAction func seekForward(_ sender: Any) {
    guard let duration  = player?.currentItem?.duration else {
        return
    }
    let playerCurrentTime = CMTimeGetSeconds(player!.currentTime())
    let newTime = playerCurrentTime + 5
    if newTime < (CMTimeGetSeconds(duration) - 5) {
        let time2: CMTime = CMTimeMake(value: Int64(newTime * 1000 as Float64), timescale: 1000)
        player!.seek(to: time2, toleranceBefore: CMTime.zero, toleranceAfter: CMTime.zero)
    }
}
@IBAction func seekBackward(_ sender: Any) {
    let playerCurrentTime = CMTimeGetSeconds(player!.currentTime())
        var newTime = playerCurrentTime - 5
        if newTime < 0 {
            newTime = 0
        }
    let time2: CMTime = CMTimeMake(value: Int64(newTime * 1000 as Float64), timescale: 1000)
    player!.seek(to: time2, toleranceBefore: CMTime.zero, toleranceAfter: CMTime.zero)
}