[Bug 797359] New: video format of endianness declared in vaapi need to be modified.

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=797359

            Bug ID: 797359
           Summary: video format of endianness declared in vaapi need to
                    be modified.
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer-vaapi
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: junyan.he at hotmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

The code:

#elif G_BYTE_ORDER == G_LITTLE_ENDIAN
  DEF_RGB (BGRA, ('B', 'G', 'R', 'A'), LSB, 32,
       32, 0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000),
  DEF_RGB (RGBA, ('R', 'G', 'B', 'A'), LSB, 32,
       32, 0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000),
  DEF_RGB (BGRx, ('B', 'G', 'R', 'X'), LSB, 32,
       24, 0x00ff0000, 0x0000ff00, 0x000000ff, 0x00000000),
  DEF_RGB (RGBx, ('R', 'G', 'B', 'X'), LSB, 32,
       24, 0x000000ff, 0x0000ff00, 0x00ff0000, 0x00000000),
-#endif

Make the ARGB xRGB kind video format not suppored when on little endian machine
like X86

The video format should not directly relate to endianness. For example,
ARGB on big endian should not be simplely seen as BGRA on little endian
machine.
We should provide endianess convert or format convert help functions if
endianness does not match.

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