[Bug 731204] androidmedia: Implement zerocopy rendering

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=731204
  GStreamer | gst-plugins-bad | git

--- Comment #13 from Matthieu Bouron <matthieu.bouron at collabora.com> 2014-06-16 07:57:35 UTC ---
As described in the surface texture documentation, a transformation matrix
should queried from the surface texture and used to sample the resulting
texture.

Ref: http://developer.android.com/reference/android/graphics/SurfaceTexture.htm

So we either need to make amcvideomemory/amcdirectbuffer + jniutils public, so
we can check the memory type in gstglupload and call
gst_amc_surface_texture_get_transformation_matrix from there and use it in the
shaders.

OR

Do the whole 2D / RGBA conversion in the upload meta function. But i'm not sure
if it is doable since we can't access the GL context from there.

What do you think ?

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