[Webkit-unassigned] [Bug 221752] New: enumerateDevices does only returns one videoinput device for multi-lense devices

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=221752

            Bug ID: 221752
           Summary: enumerateDevices does only returns one videoinput
                    device for multi-lense devices
           Product: WebKit
           Version: Safari 14
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: matthias.rauch at rubicon.eu
                CC: youennf at gmail.com

We developed a website where are able to scan barcodes via WebRTC. Since barcode scanning does not work well with wide-angle cameras, we also added a small feature where the user can select the camera to use for scanning. To achieve this we list all cameras returned from navigator.mediaDevices.enumerateDevices() for the user to choose from. The chosen deviceId is then passed in the constraints to navigator.mediaDevices.getUserMedia().

This works well on Android devices, because navigator.mediaDevices.enumerateDevices() returns multiple videoinput devices for the back facing cameras where one of them is always the telelens (=non wide-angle) camera.

In contrast navigator.mediaDevices.enumerateDevices() on iOS 14 only ever returns two videoinput devices (front camera, back camera). That is also the case for devices like iPhone 11 or iPhone 7 Plus where multiple back-facing lenses are available. This is especially a problem with iPhone 7 Plus where the wide-angle camera is selected as the default back camera and cannot be changed by the user.

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