如何更改AVPlayer的视频方向

Question

我想使用AVPlayer旋转视频回放。有没有办法把它顺时针旋转90度
这里有一些代码：

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()

更新

这个有效：

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

Swift 3:中的Hooni答案

let affineTransform = CGAffineTransform(rotationAngle: degreeToRadian(90))
avPlayerLayer.setAffineTransform(affineTransform)
func degreeToRadian(_ x: CGFloat) -> CGFloat {
    return .pi * x / 180.0
}

Answer 2

如果您使用的是Objective-C，下面的代码会有所帮助。

示例代码：

#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 3

我愿意，

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

然后在init中，类是一个NSView:

[(AVPlayerLayer*)self.layer setPlayer:player];
self.wantsLayer=YES;
self.superview.wantsLayer=YES;
if (fakePortrait) {
   [self rotateByAngle:90];
}

然而，这只适用于10.13。我正在寻找10.9及以上版本的解决方案。如果我旋转10.13之前的视频，它就会消失。