[Bug 776303] New: vaapisink: race condition during caps negotiation with multiple src elements

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=776303

            Bug ID: 776303
           Summary: vaapisink: race condition during caps negotiation with
                    multiple src elements
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer-vaapi
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: zzoon at igalia.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

1. Reproduce step:
# gst-validate-launcher -t validate.file.compositor.simple.seek_backward.bgra

2. Test pipeline
gst-launch-1.0 compositor name=_mixer !  deinterlace ! videoconvert !
autovideosink videotestsrc ! video/x-raw, framerate=\(fraction\)10/1,
width=100, height=100 ! _mixer. videotestsrc ! video/x-raw,
framerate=\(fraction\)5/1, width=320, height=240 ! _mixer.

3. Result
Sometimes negotiation fails, sometimes crash happens.

4. Cause
During get_caps, vaapisink tries to make possible raw caps based on VAquery via
gst_vaapi_plugin_base_get_allowed_raw_caps.
At this moment, race condition causes crash or failure of negotiation.

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