27 #define REGISTER_FILTER(X, x, y)                                        \ 
   29         extern AVFilter ff_##y##_##x;                                   \ 
   30         if (CONFIG_##X##_FILTER)                                        \ 
   31             avfilter_register(&ff_##y##_##x);                           \ 
   34 #define REGISTER_FILTER_UNCONDITIONAL(x)                                \ 
   36         extern AVFilter ff_##x;                                         \ 
   37         avfilter_register(&ff_##x);                                     \ 
   42     static int initialized;
 
   48 #if FF_API_ACONVERT_FILTER 
  246 #if FF_API_AVFILTERBUFFER