[Webkit-unassigned] [Bug 211230] New: Media controls tracks menu shows "Auto" selected instead of track selected via the JS API

Thu Apr 30 06:17:41 PDT 2020

https://bugs.webkit.org/show_bug.cgi?id=211230

            Bug ID: 211230
           Summary: Media controls tracks menu shows "Auto" selected
                    instead of track selected via the JS API
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: graouts at webkit.org

Created attachment 398051

  --> https://bugs.webkit.org/attachment.cgi?id=398051&action=review

Test

(this is a report from a problem originally reported by aashraya on the WebKit Slack at https://webkit.slack.com/archives/CU5LWFM28/p1588225198051000)

Consider this simple test (also attached):

<body>
    <video autoplay controls src="https://storage.googleapis.com/shaka-demo-assets/angel-one-hls/hls.m3u8" style="width: 800px"></video>
    <script>
        document.querySelector('video').addEventListener("play", e => e.target.textTracks[2].mode = "showing");
    </script>
</body>

When the video starts playing the French caption is on, which is as expected. However, when showing the captions menu, the "Auto" item is selected.

Debugging a bit in the media controls code, the problem is that when `TextTracksSupport.tracksPanelIsTrackInSectionSelected()` is called to populate individual rows under the "Subtitles" menu, the MediaControlsHost has its `captionDisplayMode` property set to `automatic`. As such, I think the media controls code is doing what is expected and there is a problem in the media engine reporting the wrong value through MediaControlsHost.

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