[Bug 747707] applemedia: expose GstCoreMediaMeta to app

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=747707

--- Comment #3 from Ilya Konstantinov <ilya.konstantinov at gmail.com> ---
avfassetsrc:

 * output: CMSampleBuffer
           -> CMBlockBuffer (if audio)
           -> CVImageBuffer (if video)

avfvideosrc:

 * output: CMSampleBuffer
           -> CVImageBuffer

vtenc:

 * input:  CVImageBuffer
 * output: CMSampleBuffer

vtdec:

 * input:  CMSampleBuffer
 * output: CVImageBuffer

avsamplevideosink:

 * input:  CMSampleBuffer

- - -

CVImageBuffer, in addition to CVPixelBuffer, can also be CVOpenGLBuffer
(Mac-only) and CVOpenGL(ES)Texture.

Since, we don't populate GstBuffer with GstMemory when configured with
"meta:GstCoreVideoBuffer" caps, we don't actually care -- we just pass the
CVImageBufferRef to the framework.

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