CODEWITHSUNDEEP
xcodemacosswiftavcapturedevice
KD.
KD.

Reputation: 2055

How to access Mac default camera using swift xcode

Today i am coding for Mac first time. What I am trying to do is access the default camera and show a preview. 2nd step i will record or take a snap if i need. For the 1st step i have written the following code

import Cocoa
import AVFoundation
class ViewController: NSViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        var session:AVCaptureSession = AVCaptureSession()
        session.sessionPreset = AVCaptureSessionPresetLow
        var device:AVCaptureDevice = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo)
        //Preview
        var previewLayer:AVCaptureVideoPreviewLayer = AVCaptureVideoPreviewLayer(session: session)
        var myView:NSView = self.view
        previewLayer.frame = myView.bounds
        previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
        self.view.layer?.addSublayer(previewLayer)
        session.startRunning()
    }
    override var representedObject: AnyObject? {
        didSet {
        // Update the view, if already loaded.
        }
    }
}

I don't see this code is turning on my laptop default camera or displaying anything on the view. What am i doing wrong here? Any direction or any example i can look for even if its in Obj-C would be really helpful. TIA.

Upvotes: 9

Views: 11748

Answers (4)

SUMIT NIHALANI
SUMIT NIHALANI

Reputation: 417

Working code in swift 5.

import Cocoa
import AVFoundation

class SomwViewController: NSViewController {
    @IBOutlet private var cameraView: NSView?
    let session: AVCaptureSession = AVCaptureSession()

    override func viewDidLoad() {
        super.viewDidLoad()
        cameraView?.wantsLayer = true
        cameraView?.layer?.backgroundColor = NSColor.black.cgColor
        session.sessionPreset = AVCaptureSession.Preset.low
        let input: AVCaptureInput = try! AVCaptureDeviceInput(device: AVCaptureDevice.default(for: .video)!)
        session.addInput(input)
        let previewLayer: AVCaptureVideoPreviewLayer = AVCaptureVideoPreviewLayer(session: session)
        previewLayer.frame = cameraView!.bounds
        previewLayer.videoGravity = AVLayerVideoGravity.resizeAspectFill

        cameraView?.layer?.addSublayer(previewLayer)
    }

    override func viewDidAppear() {
        session.startRunning()
    }

    override func viewDidDisappear() {
        session.stopRunning()
    }
}

You should definitely not use force unwraps, it's just an example.

Upvotes: 4

rolling Ztoned
rolling Ztoned

Reputation: 57

if anyone still looking to launch webcam in Mac OS X using swift 3

here is the code

@IBOutlet var previewCam: PreviewCam!
override func viewDidLoad()
{
    super.viewDidLoad()
    view.wantsLayer = true
    previewCam.wantsLayer = true
    let session:AVCaptureSession = AVCaptureSession()
    session.sessionPreset = AVCaptureSessionPresetLow
    let device:AVCaptureDevice = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo)
    print("device found = ",device)

    let device_input : AVCaptureDeviceInput = try! AVCaptureDeviceInput(device: device)


    let previewLayer:AVCaptureVideoPreviewLayer = AVCaptureVideoPreviewLayer(session: session)

    previewLayer.frame = previewCam.bounds
    previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
    self.previewCam.layer?.addSublayer(previewLayer)
    if session.canAddInput(device_input)
    {
        session.addInput(device_input)
    }
    session.startRunning()
}

for those who asked about preview cam

#import "PreviewCam.h"

@implementation PreviewCam

- (void)drawRect:(NSRect)dirtyRect {
    [super drawRect:dirtyRect];

    // Drawing code here.
    CGContextRef context = [[NSGraphicsContext currentContext]graphicsPort];
    CGContextSetRGBFillColor(context, 0, 0, 0, 0.75);
    CGContextFillRect(context, NSRectToCGRect(dirtyRect));
    self.layer.borderColor = [[NSColor whiteColor]CGColor];
    self.layer.borderWidth = 2.0f;
}

Upvotes: -1

Rick
Rick

Reputation: 3857

Be sure to check that your view has a Core Animation Layer in IB:

enter image description here

Upvotes: 3

qwerty_so
qwerty_so

Reputation: 36295

In your code the

self.view.layer?.addSublayer(previewLayer)

will not be executed since self.view.layer is nil so that won't be executed.

Alas, this does not seem to be only issue since even when adding a layer the camera does not start working. You will likely have to dig into this:

https://developer.apple.com/library/mac/samplecode/AVRecorder/Introduction/Intro.html

Upvotes: 4

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