[Bug 692012] [assrender] overlay support, and some fixes

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=692012
  GStreamer | gst-plugins-bad | 1.x

--- Comment #4 from Arnaud Vrac <rawoul at gmail.com> 2013-01-18 14:41:25 UTC ---
Created an attachment (id=233758)
 View: https://bugzilla.gnome.org/attachment.cgi?id=233758
 Review: https://bugzilla.gnome.org/review?bug=692012&attachment=233758

Add support for overlay composition

An intermediate ARGB buffer is allocated to composite the ASS images, which is
attached to an overlay composition. libass can detect when the subtitles change
so we only render the overlay when needed, not for every frame.

The patch could be extended to use overlay composition and blend it on the
video frames. Rendering might be faster because the ASS images are only
composited once on the intermediate buffer. This would also make the plugin
support all 8-bit pixel formats.

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