CODEWITHSUNDEEP
iosiphoneswiftcameraavfoundation
Hersh Bhargava
Hersh Bhargava

Reputation: 615

Programmatically Capture Maximum Resolution Image using AVCaptureSession

My goal is to use an AVCaptureSession to programmatically lock focus, capture one image, activate the flash, then capture a second image after some delay.

I have managed to get the captures to work using an AVCaptureSession instance and an AVCaptureStillImageOutput. However, the images I get when calling captureStillImageAsynchronouslyFromConnection(_:completionHandler:) are 1920 x 1080, not the full 12 megapixel image my iPhone 6S camera is capable of.

Here is my capture function:

func captureImageFromStream(completion: (result: UIImage) -> Void)
{
    if let stillOutput = self.stillImageOutput {
        var videoConnection : AVCaptureConnection?
        for connection in stillOutput.connections {
            for port in connection.inputPorts! {
                if port.mediaType == AVMediaTypeVideo {
                    videoConnection = connection as? AVCaptureConnection
                    break
                }
            }
            if videoConnection != nil {
                break
            }
        }
        if videoConnection != nil {
            stillOutput.captureStillImageAsynchronouslyFromConnection(videoConnection) {
                (imageDataSampleBuffer, error) -> Void in

                if error == nil {
                    let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(imageDataSampleBuffer)

                    if let image = UIImage(data: imageData) {
                        completion(result: image)
                    }
                }
                else {
                    NSLog("ImageCapture Error: \(error)")
                }
            }
        }
    }
}

What modifications should I make to capture the image I'm looking for? I'm new to Swift, so please excuse any beginner mistakes I've made.

Upvotes: 2

Views: 1336

Answers (1)

Gordon Childs
Gordon Childs

Reputation: 36072

Before you addOutput the stillImageOutput and startRunning, you need to set your capture session preset to photo:

captureSession.sessionPreset = AVCaptureSessionPresetPhoto

Upvotes: 2

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