[Bug 723778] New: new fakevideodec element

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=723778
  GStreamer | gst-plugins-bad | git

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


I have started a fakevideodec element here
http://cgit.collabora.com/git/user/julien/gst-plugins-good.git/commit/?h=fakevideodec&id=7a4c1ce6e3ecaa35ffbd74b7e37968e3adc70485

It's useful when you have a new embedded platform and you want to know what
would be the performance if you had a decoder that use 0% CPU. (hardware
decoder except the zero-copy part)

videotestsrc is not really usable on embedded like RPI, I mean it uses so much
CPU so not really useful to identify what would be the best FPS. 

Also fpsdisplaysink uses textoverlay for the visual fps information. When you
want a visual information only (and not a console info)

Also fakevideodec is compatible with playbin as long as you increase its rank.

For now fakevideodec just draw a kind of snake on 1 line (to make it use the
CPU the less possible)
And the snake moves from left to right in 1 sec if no drop.  So that when there
are frame dropping the snake freez and you see it jumps to other positions. At
every new frame it clears the line and draw the next position base on the
framerate and the resolution.

I made it quite quickly so it may not being exactly correct right now.

Also even if it currently visually gives an idea of the FPS, it still does not
allow to determine visually what is the precise FPS (can't say 24 or 25 FPS)

It could be improved to draw a kind of minimal meter and then draw a spot to
indicate what is the current framerate. There are several ideas.

Do no hesitate to put a comment :)

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