[Bug 778434] New: applemedia: race condition in videotexturecache.m

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=778434

            Bug ID: 778434
           Summary: applemedia: race condition in videotexturecache.m
    Classification: Platform
           Product: GStreamer
           Version: 1.11.1
                OS: Mac OS
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: socialmediamaster9000 at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Context:

Videotexturecache is a kind of wrapper on top of iosglmemory, used by
avfvideosrc and vtdec. It creates a texture at the same time as creating the
memory. Presumably it's a performance enhancement.

Bug:

Random EXC_BAD_ACCESS code=1 in GL code

Cause:

The cached texture needs to be freed at the right moment. The current technique
is to pass the texture as user_data to gst_gl_memory_init and pass CFRelease as
the destroy function. Unfortunately, the texture NEEDS to be destroyed in the
gst_gl_context_thread or it will lead to a race condition where code running in
the gst_gl_context_thread will reference a texture that is freed in a random
gstreamer thread too soon.

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