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
Consistently apply this rule: the guard name is obtained from the
filename by stripping the leading "lib", converting '/' and '.' to
'_' and uppercasing the resulting name. Guard names in the root
directory have to be prefixed by "FFMPEG_".
Originally committed as revision 15120 to svn://svn.ffmpeg.org/ffmpeg/trunk
Patch by Alexander Patrakov ($lastname <whirlpool> gmail.com)
Thread: dcadata.h: fir_32bands_perfect[] is wrong
Originally committed as revision 14964 to svn://svn.ffmpeg.org/ffmpeg/trunk
