[Webkit-unassigned] [Bug 174041] New: Calling mediaDevices.enumerateDevices() changes enumerated device IDs in other open pages

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=174041

            Bug ID: 174041
           Summary: Calling mediaDevices.enumerateDevices() changes
                    enumerated device IDs in other open pages
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: macOS 10.12.4
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media Elements
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: lepinski at gmail.com

This appears to be a regression introduced in the most recent Safari Technology Preview (Release 34, 12604.1.27.0.1).

On load, call navigator.mediaDevices.enumerateDevices() and note the device IDs in the source list. Open a new page (leaving the first page open) that also makes an enumerateDevices call. Return to the first page and enumerate your devices again; their IDs will have changed. This appears to occur regardless of whether Page 1 and 2 are on the same or different domains.

The result of this bug is that when Page 1 attempts to then use an input device ID from its first enumeration as a getUserMedia constraint, the call will fail because the device ID is invalid. 

navigator.mediaDevices.ondevicechange also not called when these device IDs change as a result of this.

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