I'm displaying a video preview of a 320x320 capture window, and using videoGravity to have it fill the square:
captureVideoPreviewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
I'm then grabbing a photo quality image from the session and cropping it, starting at 0, 0. The problem I have is the saved image shows more to the top (but not left) of the frame than the preview. I'd like to basically only see the top of the frame, it seems I'm seeing the middle section, hope I'm explaining myself properly.
Here is the code snippet if it helps:
AVCaptureVideoPreviewLayer *captureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];
captureVideoPreviewLayer.frame = _cameraView.bounds;
[_cameraView.layer addSublayer:captureVideoPreviewLayer];
captureVideoPreviewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
Thanks in advance for any help.
Cheers.
I couldn't figure out how to do this, so I decided to fix it by changing the cropping region instead of the preview region.
Related
I need some help with our CameraView inside our app. We have built a CameraView with Rectangle / Zoom capabilities (in a webView). When integrating this webCameraView in our app, accessing the camera does not work. Seems like we do have 2 options:
Make the app allow camera access from a webView (is this still not possible 2021?)
Build a copy of the webCameraView directly in the app with rectangle frame instead
Above is what the webCameraView looks like in the app. Rectangle / Zoom is displayed, but the app does not get access to the camera.
If it is not possible to access camera directly in the app via a webView I need to go for alternative nr 2.
I will try to build the same UI via Objc in the app directly. But good updated tutorials for Objc is hard to find or being outdated. All Swift boys have taken over the town! This what I have done so far:
- (void) viewDidLoad {
//-- Setup Capture Session.
_captureSession = [[AVCaptureSession alloc] init];
//-- Creata a video device and input from that Device. Add the input to the capture session.
AVCaptureDevice * videoDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
if(videoDevice == nil)
assert(0);
//-- Add the device to the session.
NSError *error;
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:videoDevice
error:&error];
if(error)
assert(0);
[_captureSession addInput:input];
//-- Configure the preview layer
_previewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:_captureSession];
_previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
[_previewLayer setFrame:CGRectMake(0, 0,
self.view.frame.size.width,
self.view.frame.size.height)];
//-- Add the layer to the view that should display the camera input
[self.view.layer addSublayer:_previewLayer];
//-- Start the camera
[_captureSession startRunning];
[super viewDidLoad];
}
The code above gives me access to the camera
How do I create a dragable Rectangle / Zoom area in the middle of the screen via Objc?
Also With capabilities to take a photo (and the photo taken should only represent the inside-area of the rectangle-area) ?
Help!
The sample code you provided is for native camera control， I wonder what it has to do with webview camera?
If you want to turn on the system camera in webview and process the acquired content, you can try to look at webrtc. This has version restrictions, but it is open in WKWebView after iOS 14.3.
Users need to be able to take photo of their ID. I need to add a blue frame to camera view as a guide. Guide should have same aspect ratio on all device sizes and fit a label with instructions. Can I accomplish this using UIImagePicker?
Here is some incomplete code. Thanks for any help.
UIImageView *overlayImage = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#""]];
CGRect overlayRect = CGRectMake(0, 0, self.view.frame.size.height - 16, self.view.frame.size.width - 16);
[overlayImage setFrame:overlayRect];
[self.imagePicker setCameraOverlayView:overlayImage];
Use AVCaptureDevice, AVCaptureSession, AVCaptureVideoPreviewLayer and AVCapturePhotoOutput.
Set AVCaptureDeviceInput as input of capture session, and photo output as output of capture session. Initialize AVCaptureVideoPreviewLayer with AVCaptureSession and add to your view.layer thought addSublayer. You can use UIViewController from storyboard or programmatically instantiated controller, add picture of overlay or cornered view.layer.borderWidth or UIBezierPath. Set up controller as AVCapturePhotoCaptureDelegate, add delegate methods. Use capturePhoto(with:delegate:) method. Enjoy.
I am trying to create a custom camera experience on iOS and the following code snippet is as far as I got. Basically I want the usual camera view (i.e. with the following buttons: capture, flash, grid, front/back, cancel). But the only difference between the normal camera and mine is that I want a square for the preview surface; not a rectangle. And then, what you see is what you get (WYSIWYG) such that there is no cropping necessary; as the user would have taken a square picture in the first place.
I have also been looking at the library https://github.com/danielebogo/DBCamera but I am not seeing how to customize it to my end. Any help? Thanks.
MY CODE SO FAR:
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
//Capture Session
AVCaptureSession *session = [[AVCaptureSession alloc]init];
session.sessionPreset = AVCaptureSessionPresetPhoto;
//Add device
AVCaptureDevice *device =
[AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
//Input
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];
if (!input)
{
NSLog(#"No Input");
}
[session addInput:input];
//Output
AVCaptureVideoDataOutput *output = [[AVCaptureVideoDataOutput alloc] init];
[session addOutput:output];
output.videoSettings =
#{ (NSString *)kCVPixelBufferPixelFormatTypeKey : #(kCVPixelFormatType_32BGRA) };
//Preview Layer
AVCaptureVideoPreviewLayer *previewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];
UIView *myView = self.view;
previewLayer.frame = myView.bounds;
previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
[self.view.layer addSublayer:previewLayer];
//Start capture session
[session startRunning];
}
This is the only custom code in a single view project on Xcode
You have two options for doing what you want, either stick with and customize a UIImagePickerController, or create your own by using the AVFoundation.
The UIImagePickerController does provide a fair bit of customization options, and this similar thread has some good information on that: link.
If you still want to make your own, I suggest heading over to the Apple Documentation and checking out this demo project called AVCam: link. However, it's way more in-depth than you'll probably need so I can recommend this video tutorial as well: link.
If going for the last option, I would like to mention that to make the "actual camera" fit the frame of your previewLayer, you can set the videoGravity on the AVCaptureVideoPreviewLayer to AVLayerVideoGravityResizeAspectFill.
Working with a custom camera can be a bit of a pain, but it’ll pay dividends given that you’ll really be able to customize your app experience.
The easiest way to do it is to use TGCameraViewController.
Using this TGCameraViewController, you can edit whole camera view. Also, It provides following functionalities:-
Easy way to access album (camera roll)
Flash auto, off and on
Focus
Front and back camera
Also you can refer AVCamManual: Extending AVCam to Use Manual Capture document for creating own custom camera.
I am developing with AvCapture session to add cutom overlays on camera screen. I have added an AvCaptureVidePreview layer as
AvCaptureVideoPreviewLayer*layer = [[AvCaptureVideoPreviewLayer alloc] iniWithSession:session];
layer.frame = self.view.layer.bounds;
but the camera preview is not full screen in case of iPhone 4S. It works fine in iPhone 5.
CGRect bounds=view.layer.bounds;
layer.videoGravity = AVLayerVideoGravityResizeAspectFill;
layer.bounds=bounds;
layer.position=CGPointMake(CGRectGetMidX(bounds), CGRectGetMidY(bounds));
may be it can help you..
I'm trying to get the video output on my screen in Swift. But the screen stays completely white. I found this tutorial in ObjC and I followed it (only in Swift style syntax).
In there there is a line previewLayer.frame = myView.bounds;
But the field .frame seems to be read only in swift. And I think this might be why I don't see anything on the screen.
How can I set the frame for the previewLayer in Swift?
I see three points in that tutorial where you could end up not displaying the preview, and thus getting a white screen. Below are the Obj-C and Swift counterparts.
1) You might have missed adding the input to the capture session:
// [session addInput:input];
session.addInput(input)
2) You might not have initialized the preview layer's bounds to that of your view controller:
// UIView *myView = self.view;
// previewLayer.frame = myView.bounds;
previewLayer.frame = self.view.bounds
3) You might not have added the preview layer as a sublayer of your view:
// [self.view.layer addSublayer:previewLayer];
self.view.layer.addSublayer(previewLayer)