Adding zoom functionality to sample IOS app

[willvictor]

Hi,

I'm trying to modify the sample ios publish app to add the ability to pinch for digital zoom with an IOS camera.

It seems like to do this, I'll need to:

1. add a pinch listener to the uiView of the publisher.
2. access the underlying video device and change the zoom level according to the pinch.

Something like this:

// maybe inside MCSwiftVideoRenderer init
let pinchGesture = UIPinchGestureRecognizer(target: self, action: #selector(handlePinchGesture(_:)))
uiView.addGestureRecognizer(pinchGesture)

func pinch(_ pinch: UIPinchGestureRecognizer) {
        guard let device = videoDeviceInput.device else { return }

        // Return zoom value between the minimum and maximum zoom values
        func minMaxZoom(_ factor: CGFloat) -> CGFloat {
            return min(min(max(factor, minimumZoom), maximumZoom), device.activeFormat.videoMaxZoomFactor)
        }

        func update(scale factor: CGFloat) {
            do {
                try device.lockForConfiguration()
                defer { device.unlockForConfiguration() }
                device.videoZoomFactor = factor
            } catch {
                print("\(error.localizedDescription)")
            }
        }

        let newScaleFactor = minMaxZoom(pinch.scale * lastZoomFactor)

        switch pinch.state {
        case .began: fallthrough
        case .changed: update(scale: newScaleFactor)
        case .ended:
            lastZoomFactor = minMaxZoom(newScaleFactor)
            update(scale: lastZoomFactor)
        default: break
        }
    }

(I jumped off of this stack overflow post)

The problem here is that i need a videoDeviceInput. I was thinking maybe i could access the device from the self.mcMan.videoSource but this seems to be an MCVideoSource, not a video device.

Could you point me in the right direction here? I'm completely new to IOS, and just trying to get started with this example.

Thanks!

[Santiago-Souto]

Hi @willvictor ! Sorry for the late response.

Could you explain a bit more which publish sample app are you referring to? In this repository, we do not have any. The publisher demo package we have is browser based.

Thanks!

[dubeyShivank]

Closing owing to lack of activity.