[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 #8 from Matthieu Bouron <matthieu.bouron at collabora.com> 2014-06-11 14:34:33 UTC ---
Dev branch updated:
  * caps are no longer hardcoded and some negotiation have been added.
Downstream caps are queried in the set_format function before the codec is
configured. If downstream caps supports the GLTextureUploadMeta,
video/x-raw(meta:GLTextureUploadMeta),format=RGBA is used for the decoder src
caps, then gst_video_decoder_negotiate is called and the presence of the meta
in the allocation query is checked in the decide_allocation method. If the meta
is found, a surface is generated and used. Biggest issue here is, if the query
allocation fails, we can no longer configure the codec with a surface
afterward. Note : caps negotiation fails with playbin flags=0x3 but work with
flags=0x1

  * on the GL part, the EXTERNAL_OES texture is converted back to a 2D / RGBA
texture using gstglconvert but it is done through a "hack" wrapping the
GL_TEXTURE_EXTERNAL_OES id to GstGlMemory that currently does not support that
kind of memory. Is adding support in the GstGLMemory relevant for this kind of
texture ? Or adding a custom function dedicated for such conversion better in
gstglconvert (not using a buffer as input but an oes texture id ?

Comments welcome :)

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