如何更改AVPlayer的视频方向？

Question

我想使用AVPlayer旋转视频的重放。有没有办法顺时针旋转90度？ 这是一些代码：

self.player = AVPlayer(URL: NSURL(fileURLWithPath: dataPath))
playerLayer = AVPlayerLayer.init(player: self.player)
playerLayer.frame = view.bounds

playerLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
view.layer.addSublayer(playerLayer)
player.play()

UPDATE

这个工作：

self.player = AVPlayer(URL: NSURL(fileURLWithPath: dataPath))
playerLayer = AVPlayerLayer.init(player: self.player)                                     
playerLayer.setAffineTransform(CGAffineTransformMakeRotation(CGFloat(M_PI))
playerLayer.frame = view.bounds        
playerLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
view.layer.addSublayer(playerLayer)
player.play()

Answer 1

如果您使用的是Objective-C，则以下代码将有所帮助。

Sample code:

#define degreeToRadian(x) (M_PI * x / 180.0)
#define radianToDegree(x) (180.0 * x / M_PI)

- (void)rotateVideoPlayerWithDegree:(CGFloat)degree {
    [_playerLayer setAffineTransform:CGAffineTransformMakeRotation(degreeToRadian(degree))];
}

Answer 2

Hooni在Swift 3中回答：

let affineTransform = CGAffineTransform(rotationAngle: degreeToRadian(90))
avPlayerLayer.setAffineTransform(affineTransform)

func degreeToRadian(_ x: CGFloat) -> CGFloat {
    return .pi * x / 180.0
}

Answer 3

我做，

+ (Class)layerClass
{
    return [AVPlayerLayer class];
}

然后在init中，该类是一个NSView：

[(AVPlayerLayer*)self.layer setPlayer:player];

self.wantsLayer=YES;
self.superview.wantsLayer=YES;

if (fakePortrait) {
   [self rotateByAngle:90];
}

但是，这仅适用于10.13。我正在寻找10.9及以上的解决方案。如果我在10.13之前旋转视频，它就会消失。