[Bug 752867] New: avfvideosrc: external session

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=752867

            Bug ID: 752867
           Summary: avfvideosrc: external session
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: Mac OS
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: ilya.konstantinov at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

I've implemented a 'session' property which allows both:
 - getting the internal AVCaptureSession used by avfvideosrc
 - giving avfvideosrc an external (already inited) AVCaptureSession; in such
case, it avoids configuration, startRunning and stopRunning, assuming it'll be
done externally

See my commit (which I'm dogfooding on iOS and OS X for the past 2 months):
https://github.com/ikonst/gst-plugins-bad/commit/dfd399ae3c33756434ff5708d73b5585b71cc79c

It's useful for attaching additional AVCaptureOutputs to the session,
externally to GStreamer.

One thing it's essential for, is to use AVCaptureVideoPreviewLayer, which is a
high performance video primitive on OS X and iOS which can display a preview of
the video input. It's a standard UI element, whose composition is performed by
the system (out of process) and has better performance than any other option.

An alternative to support AVVideoCapturePreviewLayer specifically, which could
be also nice, is to add a "preview-layer" property, accepting an
AVVideoCapturePreviewLayer whose 'session' property will be set once we
initialize the session.

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