[Webkit-unassigned] [Bug 224235] New: [GStreamer] Only seek to change the rate un updatePlaybackRate() when needed

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=224235

            Bug ID: 224235
           Summary: [GStreamer] Only seek to change the rate un
                    updatePlaybackRate() when needed
           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: eocanha at igalia.com
                CC: bugs-noreply at webkitgtk.org

A seek is used by MediaPlayerPrivateGStreamer to update the playback rate used in the pipeline. There's a special case when the rate is 0.0. This actually means "paused" and, when set, the pipeline is changed to PAUSED and no updatePlaybackRate() call is made because of an early return (and therefore, no seek). When the rate is restored to a non-zero value, the pipeline is set again to PLAYING, but an unconditional call to updatePlaybackRate() is done, leading to a seek.

It should be possible to call updatePlaybackRate() only if the non-zero rate changed with respect to the original one, instead of always doing it. This would avoid unneeded seeks, which are complex operations that can trigger collateral issues such as the one addressed in https://bugs.webkit.org/show_bug.cgi?id=223742.

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