[Bug 785006] New: DirectViv texture upload method is broken

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=785006

            Bug ID: 785006
           Summary: DirectViv texture upload method is broken
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: thaytan at noraisin.net
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: dv at pseudoterminal.org
     GNOME version: ---

If the DirectVIV texture upload method is available, it adds caps
transformations to the glupload negotiated caps set, but might not be able to
perform them when buffers arrive if the buffers don't contain GstMemory from a
physical memory allocator.

That means that this use case no longer works:

gst-launch-1.0 videotestsrc ! glupload ! glimagesink

glupload will negotiate to transform I420 to RGBA, but fail to do it. Instead,
the raw memory upload will output buffers that contain I420 GstVideoMeta, with
RGBA caps and result in:

Got context from element 'sink': gst.gl.GLDisplay=context,
gst.gl.GLDisplay=(GstGLDisplay)"\(GstGLDisplayX11\)\ gldisplayx11-0";

** (gst-launch-1.0:9095): CRITICAL **: gst_video_frame_map_id: assertion
'info->finfo->format == meta->format' failed
0:00:00.722662716  9095   0x8c1bb0 ERROR            glimagesink
gstglimagesink.c:1610:prepare_next_buffer: Failed to map video frame.
ERROR: from element
/GstPipeline:pipeline0/GstGLImageSinkBin:glimagesinkbin0/GstGLImageSink:sink:
Failed to convert multiview video buffer
Additional debug info:
gstglimagesink.c(1720): gst_glimage_sink_prepare ():
/GstPipeline:pipeline0/GstGLImageSinkBin:glimagesinkbin0/GstGLImageSink:sink
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
Freeing pipeline ...

The DirectVIV method really needs a Caps Feature on the received caps to
confirm that the buffers it will be receiving are going to work.

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