[Bug 771326] New: Fix memory leak: QCoreApplication::postEvent with DeactivateEvent never execute.

Mon Sep 12 21:07:08 UTC 2016

https://bugzilla.gnome.org/show_bug.cgi?id=771326

            Bug ID: 771326
           Summary: Fix memory leak: QCoreApplication::postEvent with
                    DeactivateEvent never execute.
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: critical
          Priority: Normal
         Component: qt-gstreamer
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: daniell at inatel.br
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 335407
  --> https://bugzilla.gnome.org/attachment.cgi?id=335407&action=edit
Patch to fix memory leak: QCoreApplication::postEvent with DeactivateEvent
never execute.

Hi,

I found a problem during restart the video in qt quick application using
QtGstreamer.
In my pc this problem occur and so I don't have any critical problem, but on
some i.MX6 board occurs memory leak in DMA allocation.
This problem occurs because 'DeactivateEvent' scheduled by 'postEvent' is never
executed. Please see log at end: 'qt-gstreamer-fail.txt'.
There you can see that after 'Deactivating' it never writes the log 'Received
deactivate event', simply this event is lost.
To fix this, I replaced method postEvent with sendEvent. Please see log at end:
'qt-gstreamer-ok.txt'.
After this fix, the 'Received deactivate event' always occurs after
'Deactivating'.

I created an application to make a test:
https://github.com/Danfx/qtteste/tree/master/QuickTest

Also a pull request of correction:
https://github.com/GStreamer/qt-gstreamer/pull/1

Please, comment.

Best Regards,
Daniel Fussia.
ICC - Inatel Competence Center

---------------- qt-gstreamer-fail.txt -------------------------
[fedora at localhost build-QuickTest-Desktop-Debug]$ GST_DEBUG=qt5videosink:6
./QuickTest 
QML debugging is enabled. Only use this in a safe environment.
Stopping
Playing
0:00:02.357603234 31450 0x7fcb0c002b20 INFO            qt5videosink
/home/fedora/env/qt-gstreamer/git/pc/qt-gstreamer/elements/gstqtvideosink/delegates/basedelegate.cpp:54:setActive:<qtquick2videosink0>
Activating
0:00:02.379428102 31450 0x7fcafc26f450 LOG             qt5videosink
/home/fedora/env/qt-gstreamer/git/pc/qt-gstreamer/elements/gstqtvideosink/gstqtquick2videosink.cpp:233:gst_qt_quick2_video_sink_set_caps:<qtquick2videosink0>
new caps video/x-raw, format=(string)I420, width=(int)640, height=(int)480,
pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive,
colorimetry=(string)bt601, framerate=(fraction)0/1
0:00:02.397144289 31450      0x1eff4d0 INFO            qt5videosink
/home/fedora/env/qt-gstreamer/git/pc/qt-gstreamer/elements/gstqtvideosink/delegates/qtquick2videosinkdelegate.cpp:33:updateNode:<qtquick2videosink0>
creating new VideoNode
0:00:02.397212117 31450      0x1eff4d0 LOG             qt5videosink
/home/fedora/env/qt-gstreamer/git/pc/qt-gstreamer/elements/gstqtvideosink/delegates/qtquick2videosinkdelegate.cpp:78:updateNode:<qtquick2videosink0>
Recalculated paint areas: Frame size: (640 x 480), target area: (x: 0,000000,
y: 0,000000, w: 640,000000, h: 480,000000), video area: (x: 0,000000, y:
0,000000, w: 640,000000, h: 480,000000), black1: (x: 0,000000, y: 0,000000, w:
0,000000, h: 0,000000), black2: (x: 0,000000, y: 0,000000, w: 0,000000, h:
0,000000)
Stopping
0:00:03.740933649 31450      0x1eff4d0 INFO            qt5videosink
/home/fedora/env/qt-gstreamer/git/pc/qt-gstreamer/elements/gstqtvideosink/delegates/basedelegate.cpp:54:setActive:<qtquick2videosink0>
Deactivating
Playing
0:00:04.033478734 31450 0x7fcb2001e450 INFO            qt5videosink
/home/fedora/env/qt-gstreamer/git/pc/qt-gstreamer/elements/gstqtvideosink/delegates/basedelegate.cpp:54:setActive:<qtquick2videosink1>
Activating
0:00:04.055639390 31450 0x7fcb2001e370 LOG             qt5videosink
/home/fedora/env/qt-gstreamer/git/pc/qt-gstreamer/elements/gstqtvideosink/gstqtquick2videosink.cpp:233:gst_qt_quick2_video_sink_set_caps:<qtquick2videosink1>
new caps video/x-raw, format=(string)I420, width=(int)640, height=(int)480,
pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive,
colorimetry=(string)bt601, framerate=(fraction)0/1
0:00:04.068494286 31450      0x1eff4d0 INFO            qt5videosink
/home/fedora/env/qt-gstreamer/git/pc/qt-gstreamer/elements/gstqtvideosink/delegates/qtquick2videosinkdelegate.cpp:33:updateNode:<qtquick2videosink1>
creating new VideoNode
0:00:04.068560875 31450      0x1eff4d0 LOG             qt5videosink
/home/fedora/env/qt-gstreamer/git/pc/qt-gstreamer/elements/gstqtvideosink/delegates/qtquick2videosinkdelegate.cpp:78:updateNode:<qtquick2videosink1>
Recalculated paint areas: Frame size: (640 x 480), target area: (x: 0,000000,
y: 0,000000, w: 640,000000, h: 480,000000), video area: (x: 0,000000, y:
0,000000, w: 640,000000, h: 480,000000), black1: (x: 0,000000, y: 0,000000, w:
0,000000, h: 0,000000), black2: (x: 0,000000, y: 0,000000, w: 0,000000, h:
0,000000)
Stopping
0:00:06.882400786 31450      0x1eff4d0 INFO            qt5videosink
/home/fedora/env/qt-gstreamer/git/pc/qt-gstreamer/elements/gstqtvideosink/delegates/basedelegate.cpp:54:setActive:<qtquick2videosink1>
Deactivating
[fedora at localhost build-QuickTest-Desktop-Debug]$ 
----------------------------------------------------------------

---------------- qt-gstreamer-ok.txt -------------------------
[fedora at localhost build-QuickTest-Desktop-Debug]$ GST_DEBUG=qt5videosink:6
./QuickTest 
QML debugging is enabled. Only use this in a safe environment.
Stopping
Playing
0:00:01.700519287 30893 0x7f2c14002720 INFO            qt5videosink
/home/fedora/env/qt-gstreamer/git/pc/qt-gstreamer/elements/gstqtvideosink/delegates/basedelegate.cpp:54:setActive:<qtquick2videosink0>
Activating
0:00:01.719814604 30893 0x7f2c0c26acf0 LOG             qt5videosink
/home/fedora/env/qt-gstreamer/git/pc/qt-gstreamer/elements/gstqtvideosink/gstqtquick2videosink.cpp:233:gst_qt_quick2_video_sink_set_caps:<qtquick2videosink0>
new caps video/x-raw, format=(string)I420, width=(int)640, height=(int)480,
pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive,
colorimetry=(string)bt601, framerate=(fraction)0/1
0:00:01.735452508 30893      0x149a4d0 INFO            qt5videosink
/home/fedora/env/qt-gstreamer/git/pc/qt-gstreamer/elements/gstqtvideosink/delegates/qtquick2videosinkdelegate.cpp:33:updateNode:<qtquick2videosink0>
creating new VideoNode
0:00:01.735518797 30893      0x149a4d0 LOG             qt5videosink
/home/fedora/env/qt-gstreamer/git/pc/qt-gstreamer/elements/gstqtvideosink/delegates/qtquick2videosinkdelegate.cpp:78:updateNode:<qtquick2videosink0>
Recalculated paint areas: Frame size: (640 x 480), target area: (x: 0,000000,
y: 0,000000, w: 640,000000, h: 480,000000), video area: (x: 0,000000, y:
0,000000, w: 640,000000, h: 480,000000), black1: (x: 0,000000, y: 0,000000, w:
0,000000, h: 0,000000), black2: (x: 0,000000, y: 0,000000, w: 0,000000, h:
0,000000)
Stopping
0:00:03.871434908 30893      0x149a4d0 INFO            qt5videosink
/home/fedora/env/qt-gstreamer/git/pc/qt-gstreamer/elements/gstqtvideosink/delegates/basedelegate.cpp:54:setActive:<qtquick2videosink0>
Deactivating
0:00:03.871636393 30893      0x149a4d0 LOG             qt5videosink
/home/fedora/env/qt-gstreamer/git/pc/qt-gstreamer/elements/gstqtvideosink/delegates/basedelegate.cpp:184:event:<qtquick2videosink0>
Received deactivate event
Playing
0:00:03.883428503 30893      0x149a4d0 INFO            qt5videosink
/home/fedora/env/qt-gstreamer/git/pc/qt-gstreamer/elements/gstqtvideosink/delegates/qtquick2videosinkdelegate.cpp:33:updateNode:<qtquick2videosink1>
creating new VideoNode
0:00:04.039055176 30893 0x7f2c34022ca0 INFO            qt5videosink
/home/fedora/env/qt-gstreamer/git/pc/qt-gstreamer/elements/gstqtvideosink/delegates/basedelegate.cpp:54:setActive:<qtquick2videosink1>
Activating
0:00:04.077142529 30893 0x7f2c34022b70 LOG             qt5videosink
/home/fedora/env/qt-gstreamer/git/pc/qt-gstreamer/elements/gstqtvideosink/gstqtquick2videosink.cpp:233:gst_qt_quick2_video_sink_set_caps:<qtquick2videosink1>
new caps video/x-raw, format=(string)I420, width=(int)640, height=(int)480,
pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive,
colorimetry=(string)bt601, framerate=(fraction)0/1
0:00:04.090962575 30893      0x149a4d0 LOG             qt5videosink
/home/fedora/env/qt-gstreamer/git/pc/qt-gstreamer/elements/gstqtvideosink/delegates/qtquick2videosinkdelegate.cpp:78:updateNode:<qtquick2videosink1>
Recalculated paint areas: Frame size: (640 x 480), target area: (x: 0,000000,
y: 0,000000, w: 640,000000, h: 480,000000), video area: (x: 0,000000, y:
0,000000, w: 640,000000, h: 480,000000), black1: (x: 0,000000, y: 0,000000, w:
0,000000, h: 0,000000), black2: (x: 0,000000, y: 0,000000, w: 0,000000, h:
0,000000)
Stopping
0:00:11.963099503 30893      0x149a4d0 INFO            qt5videosink
/home/fedora/env/qt-gstreamer/git/pc/qt-gstreamer/elements/gstqtvideosink/delegates/basedelegate.cpp:54:setActive:<qtquick2videosink1>
Deactivating
0:00:11.963297834 30893      0x149a4d0 LOG             qt5videosink
/home/fedora/env/qt-gstreamer/git/pc/qt-gstreamer/elements/gstqtvideosink/delegates/basedelegate.cpp:184:event:<qtquick2videosink1>
Received deactivate event
[fedora at localhost build-QuickTest-Desktop-Debug]$ 
----------------------------------------------------------------

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