[Bug 776927] gl: gldownload: convert GstGLMemory to GstDmaBuf

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=776927

Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> changed:

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 Attachment #364830|none                        |committed
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--- Comment #60 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
Comment on attachment 364830
  --> https://bugzilla.gnome.org/attachment.cgi?id=364830
gldownload: Add dmabuf exporting

Thanks Matt for you work. It's upstream now and works. For those curious, this
allow sharing a stream to one of more process without copies (that include
pipewire process).

commit 9f65c316e4898781757bebfbed9b46fbb6a7f7bb
Author: Matt Fischer <matt.fischer at garmin.com>
Date:   Tue Jan 10 19:23:58 2017 -0600

    gldownload: Add dmabuf exporting

    This patch adds code to gldownload to export the image as a
    dmabuf if requested.  The element now exposes memory:DMABuf as
    a cap feature, and if it is selected, the element exports the
    texture to an EGL image and then a dmabuf. It also implements a
    fallback to system memory download in case the exportation failed.

    https://bugzilla.gnome.org/show_bug.cgi?id=776927

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