[Webkit-unassigned] [Bug 225192] New: [MSE][GStreamer] WebKitMediaSrc rework v2

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=225192

            Bug ID: 225192
           Summary: [MSE][GStreamer] WebKitMediaSrc rework v2
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKitGTK
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aboya at igalia.com
                CC: bugs-noreply at webkitgtk.org

This patch (re)introduces a new source element for the MSE playback
pipeline. This is an iteration on the previous work on r249205 that
had to be reverted in r251365 because of flaky playbin3 bugs.

This new version avoids these pitfalls by avoiding flushes in
situations where they are avoidable and known to expose bugs.

This re-land shares many of the advantages that motivated the first
patch: seeks massively oversimplified and greater control by no longer
relying on appsrc. It can handle flushes of individual streams
natively.

Work has also gone into decoupling the state of the frame queue from
the state of WebKitMediaSrc so that the backend can survive
transitions from PAUSED to READY and back which
MediaPlayerPrivateGStreamer creates when playback ends. This latter
effort is not complete, and instead this version adds a special case
to inhibit downwards and back upwards transitions, avoiding any
issues.

It is expected that at this point this new backend is at least as
stable as the previous one. No LayoutTest has got worsened
expectations from adding this backend and some have improved.

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