[Bug 723761] New: add support for subtitles

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=723761
  GStreamer | gst-plugins-gl | git

           Summary: add support for subtitles
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-gl
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: julien.isorce at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Similar to textoverlay element.

Use an external GL Font API to build a separate gltexture and attach it to the
input buffer's GstVideoOverlayCompositionMeta.

Then a downstream element could call gst_video_overlay_composition_blend to
show up the subtitles.

(from gstvideooverlaycomposition API
http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-libs/html/gst-plugins-base-libs-gstvideooverlaycomposition.html)

Could inherit from GstBaseTextOverlay.

gst-launch-1.0 filesrc location=text.srt ! subparse ! text/x-raw !
gltextoverlay.text_sink ! glimagesink

Could be a separate gl element (gltextoverlay) or in GstGLFilter.

Could use FTGL https://sourceforge.net/projects/ftgl/ or any other GL font lib.

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