[Bug 720421] New: simultaneous eglglessink-based autovideosinks not possible in iOS application

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=720421
  GStreamer | gst-plugins-bad | 1.2.1

           Summary: simultaneous eglglessink-based autovideosinks not
                    possible in iOS application
    Classification: Platform
           Product: GStreamer
           Version: 1.2.1
        OS/Version: other
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: patrickr at qualnetics.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


iOS application crashes when trying to launch simultaneous video pipelines
sinking to autovideosink.  Each pipeline gets their own UIView (with overridden
layerClass), used to set the window handle for video overlay.

Current code based on Tutorial #3 at the link below, updated for GStreamer
1.2.1:
http://docs.gstreamer.com/display/GstSDK/iOS+tutorial+3%3A+Video

>From what I can tell this is an issue of sharing an EAGLContext.  I can
currently work around this by starting one pipeline, issuing the call
[EAGLContext setCurrentContext:nil], then starting the next pipeline. 

My workaround becomes more difficult when the UIView size is changed while in
the PLAYING or PAUSED state. The correct EAGLContext must be set before
changing the view size, since the surface setup process occurs on dimension
change as well.  This is easy enough to work around while changing the size of
a single UIView, but I have been unable to change dimensions of multiple video
display UIViews simultaneously, without restarting the pipeline to achieve
fine-grained control over execution order.

I would think a call for [EAGLContext setCurrentContext:] is necessary in the
gst_egl_adaptation_create_surface() method, inside
gst-plugins-bad/ext/eglgles/gstegladaptation_eagl.m.

Building for iOS 7, using XCode 5.0, on OS X 10.8.5.
Using gstreamer 1.2.1 binaries downloaded from:
http://gstreamer.freedesktop.org/data/pkg/ios/1.2.1/

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