Bug 252063 – [GStreamer] Don't emit playbackStateChanged() event after a seek

• Component: Media
• Status: RESOLVED FIXED

[Enrique Ocaña]

It is not possible to pause the playback during a seek. Sink elements lose their states entering ASYNC PAUSED->PAUSED transition. Calling HTML video.pause() during a seek doesn't result in pipeline state change call as player reports it's paused already. Forcing gst_element_set_state() doesn't really help in this case as pipeline enters inconsistent state after a seek that everything is playing but sinks are paused.

In addition, triggering playbackStateChanged() at seek end causes HTMLMediaElement::playInternal() that cleans up all signs of previous pause() call.

Don't emit playbackStateChanged() at seek end so HTML won't force playInternal() and HTMLMediaElement will call pauseInternal() again after a seek (from updatePlayState()).

This fixes following scenario:

video.currentTime = x.xx
video.play();
setTimeout(()=>{ video.pause(); }, 1} // ensure async duringn a seek (video didn't pause after initial seek had finished)

See: https://github.com/WebPlatformForEmbedded/WPEWebKit/pull/1013

[Enrique Ocaña]

Pull request: https://github.com/WebKit/WebKit/pull/9934

[EWS]

Committed 260314@main (5d8787383e48): <https://commits.webkit.org/260314@main>

Reviewed commits have been landed. Closing PR #9934 and removing active labels.

[Radar WebKit Bug Importer]

<rdar://problem/105498934>