fix: Allow getCameraDevice to return undefined when no Devices are available (e.g. iOS Simulator)

[mrousavy]

What

On an iOS simulator, getAvailableCameraDevices() returns [] (there are no cameras unfortunately).

This PR returns undefined instead of throwing an error if no device can be found.

Changes

Tested on

Related issues

• Fixes 🐛 No camera device found in IOS simulator  #1847

cc @hamdij0maa

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Name	Status	Preview	Updated (UTC)
react-native-vision-camera	✅ Ready (Inspect)	Visit Preview	Sep 25, 2023 0:11am

[hamdij0maa]

<3 🚀

[hirbod]

@mrousavy just an idea: could it be possible to have a look how Tesla Motors achieves fake camera previews inside the simulator with their RN module? Maybe it could be copied

https://github.com/teslamotors/react-native-camera-kit/blob/master/ios/ReactNativeCameraKit/SimulatorCamera.swift
https://github.com/teslamotors/react-native-camera-kit/blob/master/ios/ReactNativeCameraKit/SimulatorPreviewView.swift

[mrousavy]

@hirbod unfortunately not, no. Also that lib was written by Wix and just got moved to Tesla.

The reason why this will not work is because VisionCamera builds upon Camera Devices, allowing the user to select any given camera device. I cannot simulate a fake device, as that would mean I have to:

1. Create a dummy CameraDevice specifically for iOS simulators
2. Add dummy implementation for every single Camera Device specific function (start session, enable flash, etc) because those depend on the low-level hardware device type
3. Resolve takePhoto and recordVideo with dummy files
4. Simulate a fake preview using Metal (that's surprisingly the easy part)

Which is a shit ton of extra code. Like really, a shit ton.

The real solution would be to add support to Cameras on iOS simulators (e.g the macbooks camera, I am surprised this still doesn't work.)

[hirbod]

Yeah, makes sense. That extra work is indeed too much.

[xts-bit]

@hirbod @mrousavy Like Will it support FaceTime support on Macs?