AVFoundation CaptureStillImage issue with orientation of result image - ios

Question

I have a custom camera view controller that uses AVFoundation to capture a still image which you can see here:
My issue is that once I capture an image, the orientation is always sideways which you can see here
My code is as follows:
var captureInput: AVCaptureInput?
var stillImageOutput: AVCaptureStillImageOutput?
var previewLayer: AVCaptureVideoPreviewLayer?
var currentDevice: AVCaptureDevice?
var currentLayer: AVCaptureVideoPreviewLayer?
#IBAction func captureButtonTap(sender: UIButton) {
if(!capturingPhoto){
capturingPhoto = true
if let videoConnection = stillImageOutput!.connectionWithMediaType(AVMediaTypeVideo) {
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)) {
videoConnection.videoOrientation = AVCaptureVideoOrientation.Portrait
self.stillImageOutput?.captureStillImageAsynchronouslyFromConnection(videoConnection, completionHandler: {(sampleBuffer, error) in
if (sampleBuffer != nil) {
var imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(sampleBuffer)
var image = UIImage(data: imageData)
var imageWidth = image?.size.width
var cropRect = CGRect(x: 0, y: 0, width: imageWidth!, height: imageWidth!)
var imageRef: CGImageRef = CGImageCreateWithImageInRect(image!.CGImage, cropRect)
var croppedImage: UIImage = UIImage(CGImage: imageRef)!
self.imagePreview.image = croppedImage
self.image = croppedImage
self.switchModeToPreview()
}
})
}
}
}
}
func initCameraSession(){
configureDevice()
NSLog(String(selectedCamera))
captureSession = AVCaptureSession()
captureSession!.sessionPreset = AVCaptureSessionPresetPhoto
if(selectedCamera == 0){
var backCamera = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo)
currentDevice = backCamera
}else if(selectedCamera == 1){
var frontCamera = frontCameraIfAvalible()
currentDevice = frontCamera
}
if(currentDevice == nil){
NSException(name: "Error", reason: "Device Has No Camera.", userInfo: nil)
}
updateButtons()
var error: NSError?
var input = AVCaptureDeviceInput(device: currentDevice, error: &error)
if error == nil && captureSession!.canAddInput(input) {
captureSession!.addInput(input)
captureInput = input
stillImageOutput = AVCaptureStillImageOutput()
stillImageOutput!.outputSettings = [AVVideoCodecKey: AVVideoCodecJPEG]
if captureSession!.canAddOutput(stillImageOutput) {
captureSession!.addOutput(stillImageOutput)
previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
previewLayer!.videoGravity = AVLayerVideoGravityResizeAspectFill
previewLayer!.connection?.videoOrientation = AVCaptureVideoOrientation.Portrait
cameraPreview.layer.addSublayer(previewLayer)
previewLayer?.frame = CGRect(x: 0.0, y: 0.0, width: self.view.bounds.width, height: self.view.bounds.width + 139)
if(currentLayer != nil){
currentLayer!.removeFromSuperlayer()
}
currentLayer = previewLayer!
captureSession!.startRunning()
}
}
}
Please be aware I have left some code out on purpose and if you need further information, just request it. Thanks for the help.

Answer 1

Try using something like this, I use this to transform the buttons on my view when I rotate the device. This can be used with the image taken. Recall your standard transformation rotation matrices from linear algebra if you have ever taken that class. Basically, just alter this code to rotate the frame of the image you have captured and then make sure you set its frame bounds back to the view's frame in order to have it fit back correctly in the view. This may be more complicated than need be, But I have never had this issue before with images. Keep in mind this is being called due to a rotation change observer that has been registered, which you may not need to use. But this underlying concept is used A LOT
Any time I have rotation issues, I use this.
/**************************************************************************
DEVICE ORIENTATION DID CHANGE
**************************************************************************/
func deviceOrientationDidChange() {
println("DEVICE ORIENTATION DID CHANGE CALLED")
let orientation: UIDeviceOrientation = UIDevice.currentDevice().orientation
//------ IGNORE THESE ORIENTATIONS ------
if orientation == UIDeviceOrientation.FaceUp || orientation == UIDeviceOrientation.FaceDown || orientation == UIDeviceOrientation.Unknown || orientation == UIDeviceOrientation.PortraitUpsideDown || self.currentOrientation == orientation {
println("device orientation does not need to change --- returning...")
return
}
self.currentOrientation = orientation
//------ APPLY A ROTATION USING THE STANDARD ROTATION TRANSFORMATION MATRIX in R3 ------
/*
x y z
--- ---
x | cosø sinø 0 |
y | -sinø consø 0 |
z | 0 0 1 |
--- ---
*/
//----- PERFORM BUTTON AND VIDEO DATA BUFFER ROTATIONS ------
switch orientation {
case UIDeviceOrientation.Portrait:
println("Device Orientation Portrait")
if self.usingFrontCamera == true {
}
else {
self.playBackTransformation = CGAffineTransformMakeRotation(self.degrees0)
self.switchCaptureSession.transform = self.playBackTransformation!
self.switchCaptureSession.frame = self.view.bounds
self.flipCamera.transform = self.playBackTransformation!
self.flipCamera.frame = self.view.bounds
self.captureButton.transform = self.playBackTransformation!
self.captureButton.frame = self.view.bounds
}
break
case UIDeviceOrientation.LandscapeLeft:
println("Device Orientation LandScapeLeft")
if self.usingFrontCamera == true {
}
else {
self.playBackTransformation = CGAffineTransformMakeRotation(CGFloat(self.degrees90))
self.switchCaptureSession.transform = self.playBackTransformation!
self.switchCaptureSession.frame = self.view.bounds
self.flipCamera.transform = self.playBackTransformation!
self.flipCamera.frame = self.view.bounds
self.captureButton.transform = self.playBackTransformation!
self.captureButton.frame = self.view.bounds
}
break
case UIDeviceOrientation.LandscapeRight:
println("Device Orientation LandscapeRight")
if self.usingFrontCamera == true {
}
else {
self.playBackTransformation = CGAffineTransformMakeRotation(-self.degrees90)
self.switchCaptureSession.transform = self.playBackTransformation!
self.switchCaptureSession.frame = self.view.bounds
self.flipCamera.transform = self.playBackTransformation!
self.flipCamera.frame = self.view.bounds
self.captureButton.transform = self.playBackTransformation!
self.captureButton.frame = self.view.bounds
}
break
default:
break
}
Affine Transformation are great for rotations. There may be a function that sets the default image orientation when captured. Check Apple's references.