[Bug 702330] mpegvideoparse: Only map input buffer once

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=702330
  GStreamer | gst-plugins-bad | unspecified

--- Comment #4 from Edward Hervey <bilboed at gmail.com> 2013-06-19 05:47:32 UTC ---
I tried to keep the changes to a minimum in this patch, which is why I only
replaced GstBuffer * with GstMapInfo *.

There are multiple places where there are local "data" and "size" variables
with different meanings/usage than the input buffer, so prefered to keep amount
of changes to a minimum to avoid issues and potential bugs.

OK to push as-is and leave further cleanups/optimisations to later fixes ?

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