Any C library function may be a macro, so compound literals
passed to memcmp() must be surrounded by parens to avoid being
split on commas.
Originally committed as revision 18856 to svn://svn.ffmpeg.org/ffmpeg/trunk
Otherwise doxygen complains about ambiguous filenames when files exist
under the same name in different subdirectories.
Originally committed as revision 16912 to svn://svn.ffmpeg.org/ffmpeg/trunk