[Webkit-unassigned] [Bug 228531] New: Missing playing events when the ready state becomes HAVE_FUTURE_DATA/HAVE_ENOUGH_DATA from HAVE_METADATA state

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=228531

            Bug ID: 228531
           Summary: Missing playing events when the ready state becomes
                    HAVE_FUTURE_DATA/HAVE_ENOUGH_DATA from HAVE_METADATA
                    state
           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: tomoki.imai at sony.com

According to the specification, we need to "notify about playing" in the following cases:
- If the previous ready state was HAVE_CURRENT_DATA or less, and the new ready state is HAVE_FUTURE_DATA, and it's not paused.
- If the new ready state is HAVE_ENOUGH_DATA, and it's eligible for autoplay
https://html.spec.whatwg.org/multipage/media.html#ready-states

But the current WebKit implementation doesn't fire playing event these scenarios, which may cause the web compatibility issues on some video services.

Reproduced in the following environments:
- GTK MiniBrowser r239946 on Ubuntu 20.04
- Safari Technology Preview 124 on macOS 10.15.7

Not reproduced in the following environments:
- Google Chrome 91.0.4472.164 on macOS 10.15.7
- Firefox 90.0.2 on macOS 10.15.7

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