Why is AR.js waitin for domElement.videoWidth before adding video element to DOM?

[smuddy]

Describe the bug
Because iOS does not allow getUserMedia in third party apps using the WkWebView (p.e. Cordova) there is a native mock that hooks the navigator.getUserMedia function and provides the camera stream.
Unfortunately the property element.videoWidth is not set.

So my questsion is: why does AR.js wait for the stream inisitialisation inside ARjs.Source.protoype._initSourceWebcam? If I directly show the video element after assigning the stream, is see no side effects. Imho there is no need to wait.

To Reproduce

• setup cordova iOS project
• install plugin cordova-plugin-iosrtc and register the golbal hooks
• copy AR.js project into ww folder
• run cordova app

Expected behavior
App should initialize AR.js and show the camera image.
But it waits with an interval for element.videoWidth as trigger for adding video element to the DOM.

Smartphone (please complete the following information):

• Device: iPhone 7 & XR
• OS: 13.2.2
• Browser WkWebView

[nicolocarpignoli]

hi!
Please provide a PR for this, we will look into that, do tests, and if no problems are added but only enhancements, we will merge it

[ongeo-dev]

PR is on the way...

[benallfree]

@smuddy Do you have a demo repo? I'm working on iosrtc+AR.js too.