[Webkit-unassigned] [Bug 191876] New: [MSE] MediaSource is leaked if the video element is removed while a SourceBuffer is updating

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=191876

            Bug ID: 191876
           Summary: [MSE] MediaSource is leaked if the video element is
                    removed while a SourceBuffer is updating
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media Elements
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aboya at igalia.com

How to reproduce:

1. Build debug WebKit.
2. Copy the attached testcase to LayoutTests/imported/w3c/web-platform-tests/media-source/mediasource-leak-if-removed-updating.html
3. Run run-webkit-httpd
4. Open http://localhost:8800/media-source/mediasource-leak-if-removed-updating.html in the minibrowser with WEBKIT_DEBUG=MediaSource,Media
5. Look at the log.

Last lines of the log:

PlatformMediaSessionManager::addSession - 0x7f7690dd4258
MediaSource::MediaSource 0x7f7690dae2b0
MediaSource::setReadyState(0x7f7690dae2b0) : closed -> open
MediaSource::addSourceBuffer(video/mp4; codecs="mp4a.40.2,avc1.4d400d") 0x7f7690dae2b0
MediaSource::isTypeSupported(video/mp4; codecs="mp4a.40.2,avc1.4d400d")
http://localhost:8800/media-source/mediasource-leak-if-removed-updating.html:49:20: CONSOLE LOG Tearing down...
http://localhost:8800/media-source/mediasource-leak-if-removed-updating.html:51:20: CONSOLE LOG Test done.
PlatformMediaSessionManager::sessionWillEndPlayback - 0x7f7690dd4258
SourceBuffer::sourceBufferPrivateDidReceiveInitializationSegment(0x7f7690dcb600)
SourceBuffer::monitorBufferingRate(0x7f7690dcb600) - m_avegareBufferRate: 0,666891
SourceBuffer::provideMediaData(0x7f7690dcb600) - Enqueued 193 samples, 0 remaining
SourceBuffer::sourceBufferPrivateAppendComplete(0x7f7690dcb600) - buffered = [{0/1000000 = 0,000000}..{6423332/1000000 = 6,423332}] 
UNIMPLEMENTED: 
../../Source/WebCore/platform/graphics/gstreamer/mse/MediaPlayerPrivateGStreamerMSE.cpp(393) : virtual void WebCore::MediaPlayerPrivateGStreamerMSE::updatePlaybackRate()

Expected result:

The MediaSource should be destroyed shortly after the <video> element was removed from the DOM, but instead it survives until the document is unloaded.

You can verify this by setting "about:blank" in the address bar and looking at the logs again, only then the MediaSource is destroyed:

PlatformMediaSessionManager::removeSession - 0x7f7690dd4258
MediaSource::setReadyState(0x7f7690dae2b0) : open -> closed
MediaSource::removeSourceBuffer() 0x7f7690dae2b0
SourceBuffer::provideMediaData(0x7f7690dcb600) - Enqueued 0 samples, 0 remaining
SourceBuffer::sourceBufferPrivateAppendComplete(0x7f7690dcb600) - buffered = [{0/1000000 = 0,000000}..{6423332/1000000 = 6,423332}] 
PlatformMediaSessionManager::removeSession - 0x7f7690dd4258
PlatformMediaSessionManager::removeSession - 0x7f7690dd4258
MediaSource::~MediaSource 0x7f7690dae2b0
~MediaSourceClientGStreamerMSE()

The bug is reproducible every time. Only tested in WebKitGTK so far.

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