[Bug 702357] codecparser: optimize scanning for start code

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=702357
  GStreamer | gst-plugins-bad | unspecified

--- Comment #3 from Edward Hervey <bilboed at gmail.com> 2013-06-15 18:23:48 UTC ---
Created an attachment (id=246907)
 View: https://bugzilla.gnome.org/attachment.cgi?id=246907
 Review: https://bugzilla.gnome.org/review?bug=702357&attachment=246907

codecparsers: Make all parsers use fast start code method

This was added in 920053dae6957ded976b18ff8e111a242a077617 but only
in the mpeg video parser.

We now make mpeg video (1,2,4), h264 and vc1 parser make use of it.

Makes scanning for start codes 4.5 times faster, and overall h264 parsing
4 times faster. (When not working in passthrough obviously).

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