libs: Modify the video format of endianness.
We lack some video format because endianness declare. 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.
Signed-off-by: Junyan He junyan.he@intel.com