To my surprise, there is nothing information about VTPixelRotationSession on the Internet. I tried Baidu and Bing, and I got nothing about it.
Here is my code:
var rotationSession: VTPixelRotationSession!
override func viewDidLoad() {
let state = VTPixelRotationSessionCreate(kCFAllocatorDefault, &rotationSession)
if state != 0 {
return
}
VTSessionSetProperty(rotationSession, key: kVTPixelRotationPropertyKey_Rotation, value: kVTRotation_CW90)
}
func rotate(sourceBuffer: CVImageBuffer) {
let pixelFormat = CVPixelBufferGetPixelFormatType(sourceBuffer)
var rotatedImage: CVPixelBuffer?
CVPixelBufferCreate(kCFAllocatorDefault, 640, 480, pixelFormat, nil, &rotatedImage)
let state = VTPixelRotationSessionRotateImage(rotationSession, sourceBuffer, rotatedImage)
if state == kCVReturnSuccess {
......
}
}
The rotatedImageBuffer does not get any pixels of the sourceImageBuffer after calling VTPixelRotationSessionRotateImage.
Anyone can explain this issue?
Apple official does not give any examples about it.
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