我尝试使用 glkview 实现视频馈送，但当我尝试旋转旋转时，总是从 connectionWithMediaType 返回 nil。
这是我的设置
override public func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
videoFeed = GLKView(frame: self.view.bounds, context: EAGLContext(API: .OpenGLES2))
videoFeed.autoresizingMask = [UIViewAutoresizing.FlexibleWidth, UIViewAutoresizing.FlexibleHeight]
videoFeed.translatesAutoresizingMaskIntoConstraints = true
videoFeed.contentScaleFactor = 1.0
self.view.addSubview(videoFeed)
renderContext = CIContext(EAGLContext: videoFeed.context)
sessionQueue = dispatch_queue_create("dCamSession", DISPATCH_QUEUE_SERIAL)
videoFeed.bindDrawable()
}
override public func viewDidAppear(animated: Bool) {
super.viewDidAppear(animated)
startSession()
}
func createSession() -> AVCaptureSession {
let cam = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo)
var input:AVCaptureInput
do {
input = try AVCaptureDeviceInput(device: cam)
} catch _ as NSError {
print("Cannot Init Cam")
exit(EXIT_FAILURE)
}
//output
let videoOut = AVCaptureVideoDataOutput()
videoOut.videoSettings = nil
videoOut.alwaysDiscardsLateVideoFrames = true
videoOut.setSampleBufferDelegate(self, queue: sessionQueue)
//connectionWithMediaType always get nil
let connection = videoOut.connectionWithMediaType(AVMediaTypeVideo)
if connection.supportsVideoOrientation {
connection.videoOrientation = .Portrait
}
let session = AVCaptureSession()
//make sure the stream quality good enough.
session.sessionPreset = AVCaptureSessionPresetPhoto
session.addInput(input)
session.addOutput(videoOut)
session.commitConfiguration()
return session
}
func startSession() {
if camSession == nil {
camSession = createSession()
}
camSession.startRunning()
}
我做错了什么？
如果我删除 videoOrientation 比一切正常（但方向错误）。
没关系，您只需要异步调用它。